WO2020213444A1 - シリカ被覆粒子及びその製造方法 - Google Patents
シリカ被覆粒子及びその製造方法 Download PDFInfo
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- WO2020213444A1 WO2020213444A1 PCT/JP2020/015465 JP2020015465W WO2020213444A1 WO 2020213444 A1 WO2020213444 A1 WO 2020213444A1 JP 2020015465 W JP2020015465 W JP 2020015465W WO 2020213444 A1 WO2020213444 A1 WO 2020213444A1
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- Prior art keywords
- silica
- particles
- water
- coated
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 264
- 239000002245 particle Substances 0.000 title claims abstract description 241
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 131
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000007787 solid Substances 0.000 claims abstract description 47
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims abstract description 27
- 239000007788 liquid Substances 0.000 claims description 63
- 239000006185 dispersion Substances 0.000 claims description 56
- 238000000034 method Methods 0.000 claims description 41
- 239000000126 substance Substances 0.000 claims description 21
- 150000001875 compounds Chemical class 0.000 claims description 14
- 125000002091 cationic group Chemical group 0.000 claims description 12
- 229920003169 water-soluble polymer Polymers 0.000 claims description 12
- 125000004432 carbon atom Chemical group C* 0.000 claims description 11
- 239000003093 cationic surfactant Substances 0.000 claims description 11
- FFUAGWLWBBFQJT-UHFFFAOYSA-N hexamethyldisilazane Chemical group C[Si](C)(C)N[Si](C)(C)C FFUAGWLWBBFQJT-UHFFFAOYSA-N 0.000 claims description 9
- 125000000962 organic group Chemical group 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 150000002430 hydrocarbons Chemical group 0.000 claims description 5
- 230000003301 hydrolyzing effect Effects 0.000 claims description 4
- 239000010954 inorganic particle Substances 0.000 claims description 4
- 239000011146 organic particle Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 2
- 229930195733 hydrocarbon Natural products 0.000 claims description 2
- 239000011347 resin Substances 0.000 abstract description 14
- 229920005989 resin Polymers 0.000 abstract description 14
- 125000000524 functional group Chemical group 0.000 abstract description 4
- 239000000413 hydrolysate Substances 0.000 abstract 1
- 239000011344 liquid material Substances 0.000 abstract 1
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- 239000011521 glass Substances 0.000 description 38
- -1 sericite Chemical compound 0.000 description 35
- 239000000203 mixture Substances 0.000 description 33
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 description 29
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- 239000004945 silicone rubber Substances 0.000 description 29
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 19
- 235000011114 ammonium hydroxide Nutrition 0.000 description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 18
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 18
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 18
- 230000007062 hydrolysis Effects 0.000 description 16
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- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 13
- 239000007864 aqueous solution Substances 0.000 description 12
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 description 12
- 235000014113 dietary fatty acids Nutrition 0.000 description 10
- 239000000194 fatty acid Substances 0.000 description 10
- 229930195729 fatty acid Natural products 0.000 description 10
- ZNOCGWVLWPVKAO-UHFFFAOYSA-N trimethoxy(phenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=CC=C1 ZNOCGWVLWPVKAO-UHFFFAOYSA-N 0.000 description 9
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- WOWHHFRSBJGXCM-UHFFFAOYSA-M cetyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)C WOWHHFRSBJGXCM-UHFFFAOYSA-M 0.000 description 6
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- POPACFLNWGUDSR-UHFFFAOYSA-N methoxy(trimethyl)silane Chemical compound CO[Si](C)(C)C POPACFLNWGUDSR-UHFFFAOYSA-N 0.000 description 5
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 5
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
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- VICYBMUVWHJEFT-UHFFFAOYSA-N dodecyltrimethylammonium ion Chemical compound CCCCCCCCCCCC[N+](C)(C)C VICYBMUVWHJEFT-UHFFFAOYSA-N 0.000 description 4
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- 238000010438 heat treatment Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
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- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
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- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 2
- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
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- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
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- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
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- JQPARKNWUCPYTK-UHFFFAOYSA-M ethyl(trimethyl)azanium;2-methylprop-2-enoate Chemical compound CC[N+](C)(C)C.CC(=C)C([O-])=O JQPARKNWUCPYTK-UHFFFAOYSA-M 0.000 description 1
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- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
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- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- QSQXISIULMTHLV-UHFFFAOYSA-N strontium;dioxido(oxo)silane Chemical compound [Sr+2].[O-][Si]([O-])=O QSQXISIULMTHLV-UHFFFAOYSA-N 0.000 description 1
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- 229940073455 tetraethylammonium hydroxide Drugs 0.000 description 1
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
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- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000006227 trimethylsilylation reaction Methods 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/0241—Containing particulates characterized by their shape and/or structure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/25—Silicon; Compounds thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/19—Cosmetics or similar toiletry preparations characterised by the composition containing inorganic ingredients
- A61K8/29—Titanium; Compounds thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/02—Polysilicates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
- C08G77/18—Polysiloxanes containing silicon bound to oxygen-containing groups to alkoxy or aryloxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
- C08G77/26—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen nitrogen-containing groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/38—Polysiloxanes modified by chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/36—Compounds of titanium
- C09C1/3607—Titanium dioxide
- C09C1/3653—Treatment with inorganic compounds
- C09C1/3661—Coating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
- C09C3/063—Coating
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/10—General cosmetic use
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/40—Chemical, physico-chemical or functional or structural properties of particular ingredients
- A61K2800/60—Particulates further characterized by their structure or composition
- A61K2800/61—Surface treated
- A61K2800/62—Coated
- A61K2800/621—Coated by inorganic compounds
Definitions
- the present invention relates to silica particles whose surface is coated with silica and a method for producing the same.
- Inorganic powders such as metal powder, titanium oxide, zinc oxide, mica, talc, and barium sulfate, and organic resin powders are generally used in resins, paints, and cosmetics.
- the surface of these particles may be coated with silica for the purpose of non-aggregation, fluidity, dispersibility, suppression of photocatalytic activity, alkali resistance / acidity, improvement of feel, and improvement of light diffusivity.
- Patent Document 1 Japanese Patent Application Laid-Open No. 6-32725
- Patent Document 2 Japanese Patent Application Laid-Open No. 4-348143
- Patent Document 3 JP-A-2002-87817
- Patent Document 4 JP-A-11-193354
- silica-coated particles do not have sufficient dispersibility in particle resins and liquid substances. Also, due to the silanol groups on the silica surface, the cohesiveness may be higher than that of non-silica coated particles. Further, in the compounding with the resin, there is a problem that the particles fall off from the cut surface when the resin is cut because the adhesion to the resin is poor. In cosmetics, the slippery feel is not sufficient. Although the silica-coated particles are hydrophilic, water repellency may be required in cosmetics.
- the present invention has been made in view of the above circumstances, and has good dispersibility in a resin or a liquid substance, has a functional group capable of reacting with a resin, has good slipperiness, and has water repellency. It is an object of the present invention to provide silica-coated particles to be possessed and a method for producing the same.
- the present inventor selects some or all of the hydroxyl groups on the surface of the silica from (C) organoalkoxysilane, its hydrolyzate, and organosilazane 1 It has been found that the above-mentioned problems can be solved by reacting with species or more, and the present invention has been made.
- the present invention provides the following silica-coated particles and a method for producing the same. [1].
- the surface of (A) solid particles is coated with (B) silica, and some or all of the hydroxyl groups on the surface of (B) silica are selected from (C) organoalkoxysilane, its hydrolyzate, and organosilazane1.
- Silica-coated particles that have reacted with seeds or more and have (A) 0.5 to 100 parts by mass of silica with respect to 100 parts by mass of solid particles.
- the organoalkoxysilanes of the component (C) are organotrialkoxysilanes represented by R 1 Si (OR 2 ) 3 , diorganodialkoxysilanes represented by R 3 2 Si (OR 4 ) 2 , and (CH 3 ).
- a step of preparing a liquid containing (i) (A) solid particles, (E) an alkaline substance, (F) one or more selected from a cationic surfactant and a cationic water-soluble polymer compound, and (G) water.
- (Ii) The surface of the solid particles (A) is surfaced with silica (B) by adding (D) tetraalkoxysilan to the liquid obtained in step (i) and hydrolyzing and condensing the tetraalkoxysilane.
- the production method of the present invention it has good dispersibility in a resin or a liquid substance, has a functional group capable of reacting with a resin, has good slipperiness, and has water repellency. It is possible to provide silica-coated particles and a method for producing the same.
- the solid particles (A) are the core particles of the silica-coated particles of the present invention, and can be used alone or in combination of two or more.
- the solid particles may be either inorganic particles or organic particles, and their geometrical aspects may be spherical, polyhedral, spindle-shaped, needle-shaped, plate-shaped, or the like, and are non-porous. It may be either porous.
- the volume average particle diameter (MV value) is preferably 0.01 to 100 ⁇ m, more preferably 0.1 to 50 ⁇ m.
- the volume average particle size is measured by appropriately selecting from a microscope method, a light scattering method, a laser diffraction method, a liquid phase sedimentation method, an electric resistance method, and the like according to the particle size. For example, when it is 0.01 ⁇ m or more and less than 1 ⁇ m, it may be measured by a light scattering method, and the range of 1 ⁇ m or more and 100 ⁇ m or less may be measured by an electric resistance method.
- Inorganic particles include iron oxide, nickel oxide, chromium oxide, zinc oxide, titanium oxide, zirconium oxide, zinc oxide, cerium oxide, magnesium oxide, barium sulfate, calcium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, talc, mica.
- Kaolin Kaolin, sericite, aluminum silicate, magnesium silicate, magnesium aluminum silicate, calcium silicate, barium silicate, strontium silicate, metal tungate, hydroxyapatite, vermiculite, hygilite, bentonite, montmorillonite, hectrite , Zeolite, Ceramics, Dicalcium Phosphate, Alumina, Aluminum Hydroxide, Boron Titide, Boron Titide, Glass and the like.
- Organic particles include polyamide, polyacrylic acid / acrylic acid ester, polyester, polyethylene, polypropylene, polystyrene, styrene / acrylic acid copolymer, divinylbenzene / styrene copolymer, polyurethane, vinyl resin, urea resin, melamine resin, etc.
- Polymethylmethacrylate such as benzoguanamine, polymethylbenzoguanamine, tetrafluoroethylene, polymethylmethacrylate, cellulose, silk, nylon, phenol resin, epoxy resin, polycarbonate, polybutadiene rubber, acrylic rubber, urethane rubber, silicone rubber, fluororubber, etc. Particles can be mentioned.
- (B) component] Silica coats the surface of the core (A) solid particles.
- Silica has a structure composed of 2 units of SiO, and the production method thereof is not particularly limited, but silica is preferably obtained by a hydrolysis / condensation reaction of (D) tetraalkoxysilane as in the production method described later. Tetraalkoxysilane (D) is represented by Si (OR 6 ) 4 .
- R 6 in the formula is an alkyl group. As the alkyl group, an alkyl group having 1 to 6 carbon atoms is preferable.
- a methyl group and an ethyl group are more preferable. That is, tetramethoxysilane and tetraethoxysilane are more preferable, and tetramethoxysilane is even more preferable.
- Component (C) is one or more selected from organoalkoxysilane, a hydrolyzate thereof, and organosilazane, and one or more can be used alone or in combination of two or more as appropriate.
- the organoalkoxysilane is not particularly limited, but for example, the organoalkoxysilane is an organotrialkoxysilane represented by R 1 Si (OR 2 ) 3 and a diorgano represented by R 3 2 Si (OR 4 ) 2. dialkoxysilanes, (CH 3) 3 trimethyl alkoxysilane (wherein represented by SiOR 5, R 1, R 3 is a monovalent organic group having 1 to 20 carbon atoms, R 2, R 4, R 5 is an unsubstituted It is a monovalent hydrocarbon group having 1 to 6 carbon atoms.) And the like, and one kind alone or two or more kinds can be used in combination as appropriate.
- R 1 and R 3 are monovalent organic groups having 1 to 20 carbon atoms, and unsubstituted or substituted monovalent organic groups having 1 to 10 carbon atoms are preferable.
- R 2 , R 4 , and R 5 are unsubstituted monovalent hydrocarbon groups having 1 to 6 carbon atoms, and specific examples thereof include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group. However, it is preferably a methyl group from the viewpoint of reactivity.
- hydrolyzate examples include those represented by R 1 Si (OH) 3 , R 3 2 Si (OH) 2 , (CH 3 ) 3 SiOH and the like.
- the organosilazane is not particularly limited, but hexamethyldisilazan represented by (CH 3 ) 3 SiNHSi (CH 3 ) 3 is preferable.
- silica-coated particles In the silica-coated particles of the present invention, the surface of the core (A) solid particles is coated with (B) silica, and some or all of the hydroxyl groups on the surface of (B) silica are (C) organoalkoxysilane. Silica-coated particles that have reacted with one or more selected from hydrolysates and organosilazanes.
- the amount of (B) silica is 0.5 to 100 parts by mass, preferably 1 to 50 parts by mass, and more preferably 3 to 20 parts by mass with respect to 100 parts by mass of (A) solid particles.
- the shape of the coated silica may be film-like or granular.
- the silica may be coated on a part or all of the surface of the solid particles (A), but it is preferable that the silica is coated on the entire surface of the solid particles (A) without any gaps.
- the state of the coating can be confirmed by, for example, an electron microscope.
- the silica-coated particles may have any shape such as a spherical shape, a polyhedral shape, a spindle shape, a needle shape, a plate shape, or any of non-porous and porous shapes.
- the volume average particle size is preferably 0.01 to 100 ⁇ m, more preferably 0.1 to 50 ⁇ m.
- the silica-coated particles of the present invention are silica-coated particles in which (B) a part or all of the hydroxyl groups on the surface of silica are reacted with (C) one or more selected from (C) organoalkoxysilane, its hydrolyzate, and organosilazane. is there.
- the total amount of hydroxyl groups on the surface of (B) silica may not undergo a condensation reaction with the component (C), and the hydroxyl groups may remain.
- the amount of the component (C) may be an amount capable of reacting with the hydroxyl group on the surface of the coated silica (B), and the specific surface area of the particles, properties such as dispersibility and water repellency, and the degree of demand for a reactive functional group. Although the required amount varies depending on the amount, 0.01 to 20 parts by mass is preferable, and 0.05 to 10 parts by mass is more preferable with respect to 100 parts by mass in total of (A) solid particles and (B) silica.
- Examples of the method for producing silica-coated particles of the present invention include those including the following steps.
- a step of preparing a liquid containing (i) (A) solid particles, (E) an alkaline substance, (F) one or more selected from a cationic surfactant and a cationic water-soluble polymer compound, and (G) water.
- the surface of the solid particles (A) is surfaced with silica (B) by adding (D) tetraalkoxysilan to the liquid obtained in step (i) and hydrolyzing and condensing the tetraalkoxysilane.
- Step (i) comprises a liquid containing (A) solid particles, (E) an alkaline substance, (F) one or more selected from a cationic surfactant and a cationic water-soluble polymer compound, and (G) water.
- This is the process of preparation.
- the preparation of the liquid containing the components (A), (E), (F) and (G) of the step (i) is obtained by mixing these components.
- the solid particles (A) those separately prepared as an aqueous dispersion of the component (A) may be used.
- the alkaline substance (E) may be added after mixing the components (A), (F) and (G).
- the alkaline substance acts as a catalyst for the hydrolysis / condensation reaction of tetraalkoxysilane (D) in the step (ii).
- the alkaline substance may be used alone or in combination of two or more.
- the alkaline substance is not particularly limited, and for example, alkali metal hydroxides such as potassium hydroxide, sodium hydroxide and lithium hydroxide; alkaline earth metal hydroxides such as calcium hydroxide and barium hydroxide; potassium carbonate and carbon dioxide.
- Alkali metal carbonates such as sodium; ammonia; tetraalkylammonium hydroxides such as tetramethylammonium hydroxide and tetraethylammonium hydroxide; monomethylamine, monoethylamine, monopropylamine, monobutylamine, monopentylamine, dimethylamine, diethylamine, Alkali such as trimethylamine, triethanolamine and ethylenediamine can be used.
- ammonia is preferable because it can be easily removed from the obtained silica-coated particle powder by volatilization.
- As the ammonia a commercially available aqueous solution of ammonia can be used.
- the amount of the component (E) added is such that the pH of the liquid containing the components (A), (E), (F) and (G) of the step (i) at 25 ° C. is 9.0 to 12.0.
- the amount is preferably 9.5 to 11.0, more preferably.
- [(F) component] One or more selected from the cationic surfactant and the cationic water-soluble polymer compound may be used alone or in combination of two or more.
- the component (F) has an action of promoting the condensation reaction of hydrolyzed tetraalkoxysilane to produce silica. In addition, it may have an action of adsorbing the produced silica on the surface of the solid particles (A). In addition, (A) may act as a dispersant for solid particles.
- Examples of the cationic surfactant include alkyltrimethylammonium salt, dialkyldimethylammonium salt, polyoxyethylene alkyldimethylammonium salt, dipolyoxyethylene alkylmethylammonium salt, tripolyoxyethylene alkylammonium salt, and alkylbenzyldimethylammonium salt. Examples thereof include alkylpyridium salts, monoalkylamine salts, and monoalkylamide amine salts.
- Examples of the cationic water-soluble polymer compound include a polymer of dimethyldiallylammonium chloride, a polymer of vinyl imidazoline, a polymer of methyl vinyl imidazolium chloride, a polymer of ethyltrimethylammonium chloride acrylate, and a polymer of ethyltrimethylammonium methacrylate.
- Chloride polymer acrylamidepropyltrimethylammonium chloride polymer, methacrylicamidopropyltrimethylammonium chloride polymer, epichlorohydrin / dimethylamine polymer, ethyleneimine polymer, quaternary product of ethyleneimine polymer, allylamine hydrochloride
- examples thereof include polymers, polylysine, cationic starch, cationized cellulose, chitosan, and derivatives thereof obtained by copolymerizing these with a monomer having a nonionic group or an anionic group.
- the amount of the component (F) added is preferably 0.01 to 2 parts by mass, preferably 0.02 to 2 parts by mass with respect to 100 parts by mass of water in the liquid containing the components (A), (E), (F) and (G). 1 part by mass is more preferable. If this amount is less than 0.01 parts by mass, (A) silica that is not coated on the surface of solid particles may be produced, and if it exceeds 2 parts by mass, (A) silica that is not coated on the surface of solid particles may be produced. There is.
- the component (G) is water, and purified water or the like can be appropriately used.
- the amount of water is preferably 1 to 50% by mass of the solid particles (A) in the liquid containing the components (A), (E), (F) and (G), more preferably 5 to 30% by mass. preferable.
- a nonionic surfactant As a dispersant for solid particles, a nonionic surfactant, an amphoteric surfactant and a nonionic water-soluble polymer compound may be blended. These can be used alone or in combination of two or more.
- the nonionic surfactant include polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyethylene glycol fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and poly.
- amphoteric surfactant examples include alkyldimethylamine oxide, alkyldimethylcarboxybetaine, alkylamidepropyldimethylcarboxybetaine, alkylhydroxysulfobetaine, alkylcarboxymethylhydroxyethylimidazolinium betaine and the like.
- nonionic water-soluble polymer compound examples include guagam, starch, xanthan gum, methyl cellulose, ethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, polyvinyl alcohol, polyvinyl methyl ether, polyvinyl pyrrolidone, polyethylene glycol, and polyoxy. Examples thereof include ethylene polyoxypropylene copolymer copolymer polymer compounds, polyethyl acrylate, and polyacrylamide.
- the surface of the solid particles (A) is made of silica by adding (D) tetraalkoxysilan to the liquid obtained in the step (i) and hydrolyzing and condensing the tetraalkoxysilane.
- This is a step of coating with (B) to obtain a dispersion liquid of silica-coated particles.
- the condensate of (D) tetraalkoxysisilane is (B) silica, and the produced (B) silica adheres to the surface of (A) solid particles, whereby the surface of (A) solid particles is (B). It will be coated with silica.
- the tetraalkoxysilane (D) is as described above, but a part or all of the alkoxy group hydrolyzed may be used. Further, a partially condensed product may be used.
- the amount of the component (D) added is preferably in the range of 0.5 to 100 parts by mass, more preferably 1 to 50 parts by mass of (B) silica with respect to 100 parts by mass of (A) solid particles.
- the amount is as follows.
- the component (D) is added under stirring using a normal stirrer such as a propeller blade, a flat plate blade, and an anchor type stirring blade.
- the component (D) may be added all at once, but it is preferable to add the component (D) over time.
- the dropping time is preferably in the range of 1 minute to 6 hours, more preferably 10 minutes to 3 hours.
- the temperature at this time is preferably 0 to 60 ° C, more preferably 0 to 40 ° C.
- the surface of the solid particles (A) can be coated with silica (B). Stirring continues even after the addition of the component (D) until the hydrolysis / condensation reaction of the component (D) is completed. It can be confirmed that the coated particles have been obtained by observing the powdered particles with an electron microscope, elemental analysis of the particle surface, or a hydrophilicity test.
- step (E) an alkaline substance is additionally added to the dispersion liquid of the silica-coated particles obtained in the step (ii), and if necessary, (F) a cationic surfactant and a highly cationic water-soluble substance are added.
- This is a step of additionally adding one or more selected from molecular compounds to obtain an additionally added dispersion liquid.
- the component (E) acts as a reaction catalyst between the hydroxyl group on the surface of silica in the step (iv) and one or more selected from organoalkoxysilane, its hydrolyzate and organosilazane. Since the amount added in step (i) is insufficient to allow the hydrolysis / condensation reaction to proceed, additional addition is made in step (iii). Further, if necessary, one or more selected from (F) cationic surfactant and cationic water-soluble polymer compound is additionally added.
- the amount of the component (E) added in the step (iii) is preferably 5 times or more, more preferably 10 to 300 times the amount of the component (E) added in the step (i).
- the amount added is preferably 0.01 to 2 parts by mass with respect to 100 parts by mass of water in the liquid containing the components (A), (E), (F) and (G). , 0.02 to 1 part by mass is more preferable.
- step (iv) one or more selected from (C) organoalkoxysilane, its hydrolyzate and organosilazane are added to the additionally added dispersion obtained in the step (iii) to obtain (B) silica.
- This is a step of reacting a part or all of the hydroxyl groups on the surface with one or more selected from (C) organoalkoxysilane, its hydrolyzate, and organosilazane.
- the component (C) is as described above.
- the amount of the component (C) added may be an amount capable of reacting with the hydroxyl groups on the surface of the coated silica (B), but if the expected characteristics can be obtained, the hydroxyl groups on the surface of the coated silica (B) can be added. It may be an amount that can react with a part.
- the component (C) is added under stirring using a normal stirrer such as a propeller blade, a flat plate blade, and an anchor type stirring blade.
- the component (C) may be added over time, or may be added all at once.
- the temperature at this time is preferably 0 to 60 ° C, more preferably 0 to 40 ° C.
- the stirring is continued even after the addition of the component (C) until the reaction of the component (C) is completed. In order to complete the condensation reaction, stirring may be carried out under heating at about 40 to 100 ° C.
- water is removed from the obtained aqueous dispersion of the particles of the present invention.
- Moisture can be removed, for example, by heating the aqueous dispersion under normal pressure or reduced pressure.
- a method of allowing the dispersion to stand still under heating to remove water a dispersion liquid
- examples thereof include a method of removing water while stirring and flowing under heating, a method of spraying and dispersing a dispersion liquid in a hot air stream such as a spray dryer, and a method of using a fluidized heat medium.
- the dispersion may be concentrated by a method such as heat dehydration, filtration separation, centrifugation, decantation, or if necessary, the dispersion may be washed with water or alcohol.
- the product obtained from the aqueous dispersion with water is agglomerated, crush it with a crusher such as a jet mill, ball mill, or hammer mill.
- the component (C) has a condensation reaction with the hydroxyl group on the surface of the silica-coated solid particle is tested for water repellency when the organic group of the component (C) is hydrophobic, for example, put into water or alcoholic water. Then, it is judged from the fact that it floats on water or alcoholic water.
- the organic group of the component (C) is hydrophilic, it is determined by a test of change in hydrophilicity or the like.
- the obtained silica-coated particles can be used for resins, paints, cosmetics, etc.
- it since it has properties such as non-aggregation and dispersibility, it is suitable for particles having high cohesiveness and poor dispersibility.
- the volume average particle size of the aqueous dispersion of titanium oxide particles was measured using a dynamic light scattering particle size distribution measuring device (device name: N4Plus, manufactured by Beckman Coulter Co., Ltd.) and found to be 340 nm.
- the obtained liquid was dehydrated using a pressure filter.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated.
- the obtained dehydrated product was dried in a hot air flow dryer at a temperature of 105 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle diameter of the obtained particles was measured using a dynamic light scattering particle size distribution measuring device (device name: N4Plus, manufactured by Beckman Coulter Co., Ltd.) and found to be 350 nm.
- a dynamic light scattering particle size distribution measuring device device name: N4Plus, manufactured by Beckman Coulter Co., Ltd.
- the particles were not dispersed in water and floated on the water.
- the particles were put into 40% by volume methanol water and stirred, the particles were not dispersed in the methanol water and floated on the methanol water. From this result, it was determined that trimethylsilanol was condensed with the hydroxyl group on the surface of the silica-coated titanium oxide particles.
- Example 2 An aqueous dispersion of titanium oxide particles was obtained in the same manner as in Example 1. 968 g of the obtained aqueous dispersion of titanium oxide particles was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, and 1.6 g of 2.9% ammonia water was added. The pH of the liquid at this time was 10.5. After adjusting the temperature to 5 to 10 ° C., 14.5 g of tetramethoxysilane (amount of silica after hydrolysis / condensation reaction of 5.7 parts per 100 parts of titanium oxide particles) was added dropwise over 15 minutes. During this period, the liquid temperature was maintained at 5 to 10 ° C., and the mixture was further stirred for 1 hour to obtain an aqueous dispersion of silica-coated titanium oxide particles.
- the obtained liquid was dehydrated using a pressure filter.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated.
- the obtained dehydrated product was dried in a hot air flow dryer at a temperature of 105 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using a dynamic light scattering particle size distribution measuring device (device name: N4Plus, manufactured by Beckman Coulter Co., Ltd.) and found to be 350 nm.
- a dynamic light scattering particle size distribution measuring device device name: N4Plus, manufactured by Beckman Coulter Co., Ltd.
- the particles were not dispersed in water and floated on the water.
- the particles were put into 40% by volume methanol water and stirred, the particles were not dispersed in the methanol water and floated on the methanol water. From this result, it was determined that hexamethyldisilazane reacted with the hydroxyl group on the surface of the silica-coated titanium oxide particles to form trimethylsilylation.
- Example 1 An aqueous dispersion of titanium oxide particles was obtained in the same manner as in Example 1. 968 g of the obtained aqueous dispersion of titanium oxide particles was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, and 1.6 g of 2.9% ammonia water was added. The pH of the liquid at this time was 10.5. After adjusting the temperature to 5 to 10 ° C., 14.5 g of tetramethoxysilane (amount of silica after hydrolysis / condensation reaction of 5.7 parts per 100 parts of titanium oxide particles) was added dropwise over 15 minutes.
- the liquid temperature was maintained at 5 to 10 ° C., and stirring was further carried out for 1 hour. Then, the mixture was heated to 70 to 75 ° C. and stirred for 1 hour while maintaining the temperature to obtain an aqueous dispersion of silica-coated titanium oxide particles.
- the obtained liquid was dehydrated using a pressure filter.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated.
- the obtained dehydrated product was dried in a hot air flow dryer at a temperature of 105 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using an electric resistance method particle size distribution measuring device (device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.) and found to be 3.5 ⁇ m. From this result, it was judged that although the particles were crushed by a crusher, the cohesiveness was too strong to become primary particles. When the obtained particles were put into water and stirred, the particles were dispersed in water and were hydrophilic.
- Example 3 Polymethylmethacrylate spherical particles (trade name: Artpearl J-7P, manufactured by Negami Kogyo Co., Ltd.) with a volume average particle size of 6 ⁇ m in a glass flask with a capacity of 2 liters equipped with a stirrer using an anchor-type stirring blade, 150 g of water. 798 g, 1.5 g of 2.9% aqueous ammonia, and 5 g of a 30% lauryltrimethylammonium chloride aqueous solution (trade name: cation BB, manufactured by Nichiyu Co., Ltd.) were added. The pH of the liquid at this time was 10.1.
- the obtained liquid was dehydrated using a pressure filter.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated.
- the obtained dehydrated product was dried in a hot air flow dryer at a temperature of 105 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using an electric resistance method particle size distribution measuring device (device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.) and found to be 6 ⁇ m.
- an electric resistance method particle size distribution measuring device device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.
- the particles were not dispersed in water and floated on the water.
- the particles were poured into 10% by volume methanol water and stirred, the particles were not dispersed in the methanol water and floated on the methanol water. From this result, it was determined that phenyltrimethoxysilane was hydrolyzed and condensed with the hydroxyl group on the surface of the silica-coated polymethylmethacrylate particles.
- the obtained liquid was dehydrated using a pressure filter.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated.
- the obtained dehydrated product was dried in a hot air flow dryer at a temperature of 105 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using an electric resistance method particle size distribution measuring device (device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.) and found to be 6 ⁇ m.
- an electric resistance method particle size distribution measuring device device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.
- the obtained particles were put into water and stirred, the particles were dispersed in water and were hydrophilic.
- the obtained liquid was dehydrated using a pressure filter.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated.
- the obtained dehydrated product was dried in a hot air flow dryer at a temperature of 105 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using an electric resistance method particle size distribution measuring device (device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.) and found to be 6 ⁇ m.
- the obtained particles were put into water and stirred, the particles were dispersed in water and were hydrophilic. From this result, it was determined that phenyltrimethoxysilane did not hydrolyze or condense the hydroxyl groups on the surface of the silica-coated polymethylmethacrylate particles.
- Example 4 139 g of methylvinylpolysiloxane with kinematic viscosity of 8.4 mm 2 / s represented by the following average formula (1) and 61 g of methylhydrogen polysiloxane with kinematic viscosity of 12 mm 2 / s represented by the following average formula (2).
- a glass beaker having a capacity of 1 liter and dissolved by stirring at 2,000 rpm using a homomixane.
- the obtained emulsion is transferred to a glass flask having a capacity of 1 liter equipped with a stirring device using an anchor-type stirring blade, the temperature is adjusted to 15 to 20 ° C., and then an isododecane solution of a platinum-vinyl group-containing disiloxane complex (platinum) is stirred.
- An isododecane solution of a platinum-vinyl group-containing disiloxane complex (platinum) is stirred.
- the bonding order of each siloxane unit is not limited to the following.
- the shape of the silicone rubber particles in the obtained aqueous dispersion was observed with an optical microscope, it was spherical, and the volume average particle size was measured by an electric resistance method particle size distribution measuring device (device name: Multisizer 3, Beckman Coulter (device name: Multisizer 3, Beckman Coulter). When measured using (manufactured by Co., Ltd.), it was 2 ⁇ m.
- aqueous dispersion of silicone rubber particles was transferred to a glass flask having a capacity of 2 liters equipped with a stirrer using an anchor-type stirring blade, and 200 g of water, 1.5 g of 2.9% ammonia water, and 30% lauryltrimethylammonium were transferred. 5 g of an aqueous chloride solution (trade name: cation BB, manufactured by Nichiyu Co., Ltd.) was added. The pH of the liquid at this time was 10.2.
- the obtained liquid was dehydrated using a pressure filter.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated.
- the obtained dehydrated product was dried in a hot air flow dryer at a temperature of 80 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using an electric resistance method particle size distribution measuring device (device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.) and found to be 2 ⁇ m.
- an electric resistance method particle size distribution measuring device device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.
- the particles were not dispersed in water and floated on the water.
- the particles were put into 35% by volume methanol water and stirred, the particles were not dispersed in the methanol water and floated on the methanol water. From this result, it was determined that trimethylmethoxysilane was hydrolyzed and condensed with the hydroxyl groups on the surface of the silica-coated silicone rubber particles.
- Example 5 An aqueous dispersion of silicone rubber particles was obtained in the same manner as in Example 4. 750 g of the obtained aqueous dispersion of silicone rubber particles was transferred to a glass flask having a capacity of 2 liters equipped with a stirrer using an anchor-type stirring blade, and 199 g of water, 1.5 g of 2.9% ammonia water, and 30% lauryltrimethylammonium were transferred. 5 g of an aqueous chloride solution (trade name: cation BB, manufactured by Nichiyu Co., Ltd.) was added. The pH of the liquid at this time was 10.2.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated. The obtained dehydrated product was dried in a hot air flow dryer at a temperature of 80 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using an electric resistance method particle size distribution measuring device (device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.) and found to be 2 ⁇ m.
- an electric resistance method particle size distribution measuring device device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.
- the particles were not dispersed in water and floated on the water.
- the particles were poured into 10% by volume methanol water and stirred, the particles were not dispersed in the methanol water and floated on the methanol water. From this result, it was determined that phenyltrimethoxysilane was hydrolyzed and condensed with the hydroxyl groups on the surface of the silica-coated silicone rubber particles.
- Example 6 An aqueous dispersion of silicone rubber particles was obtained in the same manner as in Example 4. 750 g of the obtained aqueous dispersion of silicone rubber particles was transferred to a glass flask having a capacity of 2 liters equipped with a stirrer using an anchor-type stirring blade, and 199 g of water, 1.5 g of 2.9% ammonia water, and 30% lauryltrimethylammonium were transferred. 5 g of an aqueous chloride solution (trade name: cation BB, manufactured by Nichiyu Co., Ltd.) was added. The pH of the liquid at this time was 10.2.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated. The obtained dehydrated product was dried in a hot air flow dryer at a temperature of 80 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using an electric resistance method particle size distribution measuring device (device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.) and found to be 2 ⁇ m.
- an electric resistance method particle size distribution measuring device device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.
- the particles were not dispersed in water and floated on the water.
- the particles were poured into 10% by volume methanol water and stirred, the particles were not dispersed in the methanol water and floated on the methanol water. From this result, it was determined that 3-methacryloxypropyltrimethoxysilane was hydrolyzed and condensed with the hydroxyl group on the surface of the silica-coated silicone rubber particles.
- aqueous dispersion of silicone rubber particles was obtained in the same manner as in Example 4. 750 g of the obtained aqueous dispersion of silicone rubber particles was transferred to a glass flask having a capacity of 2 liters equipped with a stirrer using an anchor-type stirring blade, and 200 g of water, 1.5 g of 2.9% ammonia water and 30% lauryltrimethylammonium chloride were transferred. 5 g of an aqueous solution (trade name: cation BB, manufactured by Nichiyu Co., Ltd.) was added. The pH of the liquid at this time was 10.2.
- the obtained liquid was dehydrated using a pressure filter.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated.
- the obtained dehydrated product was dried in a hot air flow dryer at a temperature of 80 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using an electric resistance method particle size distribution measuring device (device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.) and found to be 2 ⁇ m.
- an electric resistance method particle size distribution measuring device device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.
- the obtained particles were put into water and stirred, the particles were dispersed in water and were hydrophilic.
- aqueous dispersion of silicone rubber particles was obtained in the same manner as in Example 4. 750 g of the obtained aqueous dispersion of silicone rubber particles was transferred to a glass flask having a capacity of 2 liters equipped with a stirrer using an anchor-type stirring blade, and 200 g of water, 1.5 g of 2.9% ammonia water, and 30% lauryltrimethylammonium were transferred. 5 g of an aqueous chloride solution (trade name: cation BB, manufactured by Nichiyu Co., Ltd.) was added. The pH of the liquid at this time was 10.2.
- the obtained liquid was dehydrated using a pressure filter.
- the dehydrated product was transferred to a glass flask having a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, 1,000 g of 50% methanol water was added, and the mixture was stirred for 30 minutes and then dehydrated using a pressure filter. .. Transfer the dehydrated product to a glass flask with a capacity of 2 liters equipped with a stirring device using an anchor-shaped stirring blade, add 1,000 g of water, stir for 30 minutes, dehydrate using a pressure filter, and repeat the same procedure. The operation was repeated.
- the obtained dehydrated product was dried in a hot air flow dryer at a temperature of 80 ° C., and the dried product was crushed with a jet mill to obtain particles.
- the volume average particle size of the obtained particles was measured using an electric resistance method particle size distribution measuring device (device name: Multisizer 3, manufactured by Beckman Coulter Co., Ltd.) and found to be 2 ⁇ m.
- the obtained particles were put into water and stirred, the particles were dispersed in water and were hydrophilic. From this result, it was determined that trimethylmethoxysilane did not hydrolyze or condense the hydroxyl groups on the surface of the silica-coated silicone rubber particles.
- the viscosity of the liquid epoxy resin mixed with the silica-coated silicone rubber particles is higher than that of the particles of Example 5 in which the hydroxyl group on the silica surface reacts with phenyltrimethoxysilane, as compared with the particles of Comparative Example 3 in which the surface of silica is not treated. Is lower. From this, it is judged that the particles of Example 5 in which the hydroxyl group on the silica surface reacts with phenyltrimethoxysilane have better dispersibility and wettability with respect to the epoxy resin.
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Abstract
Description
性、光触媒活性抑制、耐アルカリ・酸性、感触の向上、光拡散性等の向上を目的に、それら粒子表面をシリカで被覆される場合がある。
化粧品においては、滑り性の感触が十分ではない。シリカ被覆粒子は親水性であるが、化粧品においては撥水性が求められる場合がある。
[1].(A)固体粒子の表面が(B)シリカで被覆され、この(B)シリカの表面の水酸基の一部又は全部が、(C)オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上と反応したシリカ被覆粒子であって、(A)固体粒子100質量部に対して、(B)シリカが0.5~100質量部であるシリカ被覆粒子。
[2].(B)シリカが、(D)テトラアルコキシシランの加水分解・縮合物である[1]記載のシリカ被覆粒子。
[3].(A)固体粒子が、無機粒子である[1]又は[2]記載のシリカ被覆粒子。
[4].(A)固体粒子が、有機粒子である[1]又は[2]記載のシリカ被覆粒子。
[5].(C)成分のオルガノアルコキシシランが、R1Si(OR2)3で表されるオルガノトリアルコキシシラン、R3 2Si(OR4)2で表されるジオルガノジアルコキシシラン及び(CH3)3SiOR5で表されるトリメチルアルコキシシラン(式中、R1,R3は炭素数1~20の1価有機基、R2、R4、R5は非置換の炭素数1~6の1価炭化水素基である。)から選ばれる基であり、オルガノシラザンが(CH3)3SiNHSi(CH3)3で表されるヘキサメチルジシラザンである[1]~[4]のいずれかに記載のシリカ被覆粒子。
[6].下記(i)~(iv)の工程を含む[1]~[5]のいずれかに記載のシリカ被覆粒子を製造する製造方法。
(i)(A)固体粒子、(E)アルカリ性物質、(F)カチオン性界面活性剤及びカチオン性水溶性高分子化合物から選ばれる1種以上、及び(G)水を含む液を調製する工程、
(ii)工程(i)で得られた液に、(D)テトラアルコキシシシランを添加し、テトラアルコキシシシランを加水分解・縮合させることにより、固体粒子(A)の表面をシリカ(B)で被覆し、シリカ被覆粒子の分散液を得る工程、
(iii)工程(ii)で得られたシリカ被覆粒子の分散液に、(E)アルカリ性物質を追加添加、及び必要に応じて(F)カチオン性界面活性剤及びカチオン性水溶性高分子化合物から選ばれる1種以上を追加添加し、追加添加した分散液を得る工程、
(iv)工程(iii)で得られた追加添加した分散液に、(C)オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上を添加し、(B)シリカの表面の水酸基の一部又は全部を、(C)オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上と反応させる工程
[(A)成分]
(A)固体粒子は、本発明のシリカ被覆粒子の核となる粒子であり、1種単独で又は2種以上を適宜組み合わせて用いることができる。固体粒子としては、無機粒子、有機粒子のいずれでもよく、また、その幾何学的態様が、球状、多面体状、紡錘状、針状、板状等いずれの形状でもよく、また、無孔質、多孔質のいずれでもよい。体積平均粒径(MV値)は0.01~100μmが好ましく、0.1~50μmがより好ましい。体積平均粒径は、粒径に合わせ、顕微鏡法、光散乱法、レーザー回折法、液相沈降法、電気抵抗法等から適宜選択して測定する。例えば、0.01μm以上1μm未満の場合は光散乱法、1μm以上100μm以下の範囲は電気抵抗法で測定すればよい。
(B)シリカは、核となる(A)固体粒子の表面を被覆するものである。シリカはSiO2単位からなる構造であり、その製法は特に限定されないが、後述する製造方法のように、(D)テトラアルコキシシランの加水分解・縮合反応によって得られるものが好ましい。テトラアルコキシシラン(D)は、Si(OR6)4で表される。式中のR6はアルキル基である。アルキル基としては、炭素数1~6のアルキル基が好ましい。具体的には、メチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基等が挙げられるが、反応性の点から、メチル基、エチル基であることがより好ましい。すなわち、テトラメトキシシラン、テトラエトキシシランがより好ましく、テトラメトキシシランがさらに好ましい。
(C)成分は、オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上であり、1種単独で又は2種以上を適宜組み合わせて用いることができる。
本発明のシリカ被覆粒子は、核となる(A)固体粒子の表面が(B)シリカで被覆され、(B)シリカの表面の水酸基の一部又は全部が、(C)オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上と反応したシリカ被覆粒子である。
本発明のシリカ被覆粒子の製造方法としては、例えば以下の工程を含むものが挙げられる。
(i)(A)固体粒子、(E)アルカリ性物質、(F)カチオン性界面活性剤及びカチオン性水溶性高分子化合物から選ばれる1種以上、及び(G)水を含む液を調製する工程、
(ii)工程(i)で得られた液に、(D)テトラアルコキシシシランを添加し、テトラアルコキシシシランを加水分解・縮合させることにより、固体粒子(A)の表面をシリカ(B)で被覆し、シリカ被覆粒子の分散液を得る工程、
(iii)工程(ii)で得られたシリカ被覆粒子の分散液に、(E)アルカリ性物質を追加添加、及び必要に応じて(F)カチオン性界面活性剤及びカチオン性水溶性高分子化合物から選ばれる1種以上を追加添加し、追加添加した分散液を得る工程、
(iv)工程(iii)で得られた追加添加した分散液に、(C)オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上を添加し、(B)シリカの表面の水酸基の一部又は全部を、(C)オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上と反応させる工程
(E)アルカリ性物質は、工程(ii)において、テトラアルコキシシラン(D)の加水分解・縮合反応の触媒として作用する。アルカリ性物質は1種単独で用いても2種以上を併用してもよい。
(F)カチオン性界面活性剤及びカチオン性水溶性高分子化合物から選ばれる1種以上は、1種単独で又は2種以上を適宜組み合わせて用いることができる。(F)成分は、加水分解したテトラアルコキシシランの縮合反応を促進し、シリカを生成させる作用がある。また、生成したシリカを固体粒子(A)表面に吸着させる作用がある可能性もある。また、(A)固体粒子の分散剤として作用する場合もある。
(G)成分は水であり、精製水等を適宜用いることができる。水の量は、(A)、(E)、(F)及び(G)成分を含む液中の(A)固体粒子が1~50質量%となる量が好ましく、5~30質量%がより好ましい。
(C)成分は、時間をかけて添加してもよいが、一度に添加してもよい。このときの温度は0~60℃とすることが好ましく、より好ましくは0~40℃の範囲である。撹拌は、(C)成分の添加後も、(C)成分の反応が完結するまで継続する。縮合反応を完結させるためには、撹拌は40~100℃程度の加熱下で行ってもよい。
酸化チタン粒子(商品名:タイペークPFC-407、石原産業(株)製)120g、40%ジメチルジアリルアンモニウムクロライド重合体水溶液(商品名:MEポリマーH40W、東邦化学工業(株)製、平均分子量=24万)1.3g、及び水1,040gを2リットルのガラスビーカーに仕込み、ホモミキサーを用いて6,000rpmで10分間撹拌した。次いで、100MPaの圧力の条件でホモジナイザーに通し、酸化チタン粒子の水分散液を得た。
酸化チタン粒子の水分散液の体積平均粒径を動的光散乱法粒度分布測定装置(装置名:N4Plus、ベックマン・コールター(株)製)を用いて測定したところ、340nmであった。
得られた粒子を水に投入し撹拌したところ、粒子は水に分散せず、水上に浮いた状態となった。さらに、40体積%メタノール水に投入し撹拌したところ、粒子はメタノール水に分散せず、メタノール水上に浮いた状態となった。この結果より、シリカ被覆酸化チタン粒子表面の水酸基にトリメチルシラノールが縮合反応していると判断された。
実施例1と同様にして、酸化チタン粒子の水分散液を得た。得られた酸化チタン粒子の水分散液968gを錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、2.9%アンモニア水1.6gを添加した。このときの液のpHは、10.5であった。5~10℃に温調した後、テトラメトキシシラン14.5g(酸化チタン粒子100部に対し、加水分解・縮合反応後のシリカが5.7部となる量)を15分かけて滴下し、この間の液温を5~10℃に保ち、さらに1時間撹拌を行い、シリカ被覆酸化チタン粒子の水分散液を得た。
実施例1と同様にして、酸化チタン粒子の水分散液を得た。得られた酸化チタン粒子の水分散液968gを錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、2.9%アンモニア水1.6gを添加した。このときの液のpHは、10.5であった。5~10℃に温調した後、テトラメトキシシラン14.5g(酸化チタン粒子100部に対し、加水分解・縮合反応後のシリカが5.7部となる量)を15分かけて滴下し、この間の液温を5~10℃に保ち、さらに1時間撹拌を行った。次いで70~75℃まで加熱し、その温度を保ったまま1時間撹拌を行い、シリカ被覆酸化チタン粒子の水分散液を得た。
錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに、体積平均粒径が6μmのポリメチルメタクリレート球状粒子(商品名:アートパールJ-7P、根上工業(株)製)150g、水798g、2.9%アンモニア水1.5g、及び30%ラウリルトリメチルアンモニウムクロライド水溶液(商品名:カチオンBB、日油(株)製)5gを添加した。このときの液のpHは、10.1であった。5~10℃に温調した後、テトラメトキシシラン24.3g(ポリメチルメタクリレート球状粒子100部に対し、加水分解・縮合反応後のシリカが6.4部となる量)を20分かけて滴下した、この間の液温を5~10℃に保ち、さらに1時間撹拌を行い、シリカ被覆ポリメチルメタクリレート粒子の水分散液を得た。
得られた粒子を水に投入し撹拌したところ、粒子は水に分散せず、水上に浮いた状態となった。さらに、10体積%メタノール水に投入し撹拌したところ、粒子はメタノール水に分散せず、メタノール水上に浮いた状態となった。この結果より、シリカ被覆ポリメチルメタクリレート粒子表面の水酸基にフェニルトリメトキシシランが加水分解・縮合反応していると判断された。
錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに、体積平均粒径が6μmのポリメチルメタクリレート球状粒子(商品名:アートパールJ-7P、根上工業(株)製)150g、水798g、2.9%アンモニア水1.5g、及び30%ラウリルトリメチルアンモニウムクロライド水溶液(商品名:カチオンBB、日油(株)製)5gを添加した。このときの液のpHは、10.1であった。5~10℃に温調した後、テトラメトキシシラン24.3g(ポリメチルメタクリレート球状粒子100部に対し、加水分解・縮合反応後のシリカが6.4部となる量)を20分かけて滴下した、この間の液温を5~10℃に保ち、さらに1時間撹拌を行った。次いで70~75℃まで加熱し、その温度を保ったまま1時間撹拌を行い、シリカ被覆ポリメチルメタクリレート粒子の水分散液を得た。
錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに、体積平均粒径が6μmのポリメチルメタクリレート球状粒子(商品名:アートパールJ-7P、根上工業(株)製)150g、水798g、2.9%アンモニア水1.5g、及び30%ラウリルトリメチルアンモニウムクロライド水溶液(商品名:カチオンBB、日油(株)製)5gを添加した。このときの液のpHは、10.1であった。5~10℃に温調した後、テトラメトキシシラン24.3g(ポリメチルメタクリレート球状粒子100部に対し、加水分解・縮合反応後のシリカが6.4部となる量)を20分かけて滴下した、この間の液温を5~10℃に保ち、さらに1時間撹拌を行い、シリカ被覆ポリメチルメタクリレート粒子の水分散液を得た。
得られた粒子を水に投入し撹拌したところ、粒子は水に分散し、親水性であった。この結果より、シリカ被覆ポリメチルメタクリレート粒子表面の水酸基にフェニルトリメトキシシランは加水分解・縮合反応していないと判断された。
下記平均式(1)で示される、動粘度8.4mm2/sのメチルビニルポリシロキサン139gと、下記平均式(2)で示される、動粘度が12mm2/sのメチルハイドロジェンポリシロキサン61gとを容量1リットルのガラスビーカーに仕込み、ホモミキサーを用いて2,000rpmで撹拌溶解させた。次いで、ポリオキシエチレンラウリルエーテル(エチレンオキサイド付加モル数=9モル)0.8gと水50gを加え、ホモミキサーを用いて6,000rpmで撹拌したところ、水中油型となり、増粘が認められ、さらに、15分間撹拌を継続した。次いで、2,000rpmで撹拌しながら、水747gを加え、白色エマルジョンを得た。次いで、40MPaの圧力の条件でホモジナイザーに通し、エマルジョン粒子の微細化を行った。得られたエマルジョンを錨型撹拌翼による撹拌装置の付いた容量1リットルのガラスフラスコに移し、15~20℃に温調した後、撹拌下に白金-ビニル基含有ジシロキサン錯体のイソドデカン溶液(白金含有量0.5%)0.5gとポリオキシエチレンラウリルエーテル(エチレンオキサイド付加モル数=9モル)1gの混合溶解物を添加し、同温度で12時間撹拌し、シリコーンゴム粒子の水分散液を得た。なお、下記式において、各シロキサン単位の結合順序は、下記に制限されるものではない。
得られた粒子を水に投入し撹拌したところ、粒子は水に分散せず、水上に浮いた状態となった。さらに、35体積%メタノール水に投入し撹拌したところ、粒子はメタノール水に分散せず、メタノール水上に浮いた状態となった。この結果より、シリカ被覆シリコーンゴム粒子表面の水酸基にトリメチルメトキシシランが加水分解・縮合反応していると判断された。
実施例4と同様にして、シリコーンゴム粒子の水分散液を得た。得られたシリコーンゴム粒子の水分散液750gを錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、水199g、2.9%アンモニア水1.5g、及び30%ラウリルトリメチルアンモニウムクロライド水溶液(商品名:カチオンBB、日油(株)製)5gを添加した。このときの液のpHは、10.2であった。5~10℃に温調した後、テトラメトキシシラン29.1g(シリコーンゴム粒子100部に対し、加水分解・縮合反応後のシリカが7.7部となる量)を25分かけて滴下した、この間の液温を5~10℃に保ち、さらに1時間撹拌を行い、シリカ被覆シリコーンゴム粒子の水分散液を得た。
得られた液を、加圧ろ過器を用いて脱水した。脱水物を錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、50%メタノール水1,000gを添加し、30分間撹拌を行った後、加圧ろ過器を用いて脱水した。脱水物を錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、水1,000gを添加し、30分間撹拌を行った後、加圧ろ過器を用いて脱水し、もう一度同じ操作を繰り返した。得られた脱水物を熱風流動乾燥機中で80℃の温度で乾燥し、乾燥物をジェットミルで解砕し、粒子を得た。
得られた粒子を水に投入し撹拌したところ、粒子は水に分散せず、水上に浮いた状態となった。さらに、10体積%メタノール水に投入し撹拌したところ、粒子はメタノール水に分散せず、メタノール水上に浮いた状態となった。この結果より、シリカ被覆シリコーンゴム粒子表面の水酸基にフェニルトリメトキシシランが加水分解・縮合反応していると判断された。
実施例4と同様にして、シリコーンゴム粒子の水分散液を得た。得られたシリコーンゴム粒子の水分散液750gを錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、水199g、2.9%アンモニア水1.5g、及び30%ラウリルトリメチルアンモニウムクロライド水溶液(商品名:カチオンBB、日油(株)製)5gを添加した。このときの液のpHは、10.2であった。5~10℃に温調した後、テトラメトキシシラン29.1g(シリコーンゴム粒子100部に対し、加水分解・縮合反応後のシリカが7.7部となる量)を25分かけて滴下した、この間の液温を5~10℃に保ち、さらに1時間撹拌を行い、シリカ被覆シリコーンゴム粒子の水分散液を得た。
得られた液を、加圧ろ過器を用いて脱水した。脱水物を錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、50%メタノール水1,000gを添加し、30分間撹拌を行った後、加圧ろ過器を用いて脱水した。脱水物を錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、水1,000gを添加し、30分間撹拌を行った後、加圧ろ過器を用いて脱水し、もう一度同じ操作を繰り返した。得られた脱水物を熱風流動乾燥機中で80℃の温度で乾燥し、乾燥物をジェットミルで解砕し、粒子を得た。
得られた粒子を水に投入し撹拌したところ、粒子は水に分散せず、水上に浮いた状態となった。さらに、10体積%メタノール水に投入し撹拌したところ、粒子はメタノール水に分散せず、メタノール水上に浮いた状態となった。この結果より、シリカ被覆シリコーンゴム粒子表面の水酸基に3-メタクリロキシプロピルトリメトキシシランが加水分解・縮合反応していると判断された。
実施例4と同様にして、シリコーンゴム粒子の水分散液を得た。得られたシリコーンゴム粒子の水分散液750gを錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、水200g、2.9%アンモニア水1.5g及び30%ラウリルトリメチルアンモニウムクロライド水溶液(商品名:カチオンBB、日油(株)製)5gを添加した。このときの液のpHは、10.2であった。5~10℃に温調した後、テトラメトキシシラン29.1g(シリコーンゴム粒子100部に対し、加水分解・縮合反応後のシリカが7.7部となる量)を25分かけて滴下した、この間の液温を5~10℃に保ち、さらに1時間撹拌を行った。次いで、70~75℃まで加熱し、その温度を保ったまま1時間撹拌を行い、シリカ被覆シリコーンゴム粒子の水分散液を得た。
得られた粒子を水に投入し撹拌したところ、粒子は水に分散し、親水性であった。
実施例4と同様にして、シリコーンゴム粒子の水分散液を得た。得られたシリコーンゴム粒子の水分散液750gを錨型撹拌翼による撹拌装置の付いた容量2リットルのガラスフラスコに移し、水200g、2.9%アンモニア水1.5g、及び30%ラウリルトリメチルアンモニウムクロライド水溶液(商品名:カチオンBB、日油(株)製)5gを添加した。このときの液のpHは、10.2であった。5~10℃に温調した後、テトラメトキシシラン29.1g(シリコーンゴム粒子100部に対し、加水分解・縮合反応後のシリカが7.7部となる量)を25分かけて滴下した、この間の液温を5~10℃に保ち、さらに1時間撹拌を行い、シリカ被覆シリコーンゴム粒子の水分散液を得た。
得られた粒子を水に投入し撹拌したところ、粒子は水に分散し、親水性であった。この結果より、シリカ被覆シリコーンゴム粒子表面の水酸基にトリメチルメトキシシランが加水分解・縮合反応してないと判断された。
ガラス瓶に、液状エポキシ樹脂(商品名:ZX-1059、新日鐵化学製)70g及び表1に示すシリカ被覆シリコーンゴム粒子8gを量り取り、スパチュラで撹拌し、シリカ被覆シリコーンゴム粒子が均一に分散した状態とした。その分散液の25℃における粘度を、回転粘度計で測定した結果を表1に示す。
Claims (6)
- (A)固体粒子の表面が(B)シリカで被覆され、この(B)シリカの表面の水酸基の一部又は全部が、(C)オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上と反応したシリカ被覆粒子であって、(A)固体粒子100質量部に対して、(B)シリカが0.5~100質量部であるシリカ被覆粒子。
- (B)シリカが、(D)テトラアルコキシシランの加水分解・縮合物である請求項1記載のシリカ被覆粒子。
- (A)固体粒子が、無機粒子である請求項1又は2記載のシリカ被覆粒子。
- (A)固体粒子が、有機粒子である請求項1又は2記載のシリカ被覆粒子。
- (C)成分のオルガノアルコキシシランが、R1Si(OR2)3で表されるオルガノトリアルコキシシラン、R3 2Si(OR4)2で表されるジオルガノジアルコキシシラン及び(CH3)3SiOR5で表されるトリメチルアルコキシシラン(式中、R1,R3は炭素数1~20の1価有機基、R2、R4、R5は非置換の炭素数1~6の1価炭化水素基である。)から選ばれる基であり、オルガノシラザンが(CH3)3SiNHSi(CH3)3で表されるヘキサメチルジシラザンである請求項1~4のいずれか1項に記載のシリカ被覆粒子。
- 下記(i)~(iv)の工程を含む請求項1~5のいずれか1項に記載のシリカ被覆粒子を製造する製造方法。
(i)(A)固体粒子、(E)アルカリ性物質、(F)カチオン性界面活性剤及びカチオン性水溶性高分子化合物から選ばれる1種以上、及び(G)水を含む液を調製する工程、
(ii)工程(i)で得られた液に、(D)テトラアルコキシシシランを添加し、テトラアルコキシシシランを加水分解・縮合させることにより、固体粒子(A)の表面をシリカ(B)で被覆し、シリカ被覆粒子の分散液を得る工程、
(iii)工程(ii)で得られたシリカ被覆粒子の分散液に、(E)アルカリ性物質を追加添加、及び必要に応じて(F)カチオン性界面活性剤及びカチオン性水溶性高分子化合物から選ばれる1種以上を追加添加し、追加添加した分散液を得る工程、
(iv)工程(iii)で得られた追加添加した分散液に、(C)オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上を添加し、(B)シリカの表面の水酸基の一部又は全部を、(C)オルガノアルコキシシラン、その加水分解物及びオルガノシラザンから選ばれる1種以上と反応させる工程
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- 2020-04-06 US US17/603,669 patent/US20220194803A1/en active Pending
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US20220194803A1 (en) | 2022-06-23 |
EP3957606A1 (en) | 2022-02-23 |
JP7238975B2 (ja) | 2023-03-14 |
CN113727947B (zh) | 2024-04-05 |
TW202103675A (zh) | 2021-02-01 |
JPWO2020213444A1 (ja) | 2020-10-22 |
CN113727947A (zh) | 2021-11-30 |
KR20210151877A (ko) | 2021-12-14 |
EP3957606A4 (en) | 2023-11-08 |
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