WO2014069589A1 - アルミナ質繊維集合体、その製造方法および用途 - Google Patents
アルミナ質繊維集合体、その製造方法および用途 Download PDFInfo
- Publication number
- WO2014069589A1 WO2014069589A1 PCT/JP2013/079600 JP2013079600W WO2014069589A1 WO 2014069589 A1 WO2014069589 A1 WO 2014069589A1 JP 2013079600 W JP2013079600 W JP 2013079600W WO 2014069589 A1 WO2014069589 A1 WO 2014069589A1
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- WIPO (PCT)
- Prior art keywords
- alumina fiber
- fiber aggregate
- firing
- precursor
- alumina
- Prior art date
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000000746 purification Methods 0.000 claims abstract description 8
- 239000000835 fiber Substances 0.000 claims description 108
- 238000010304 firing Methods 0.000 claims description 38
- 239000002243 precursor Substances 0.000 claims description 28
- 238000009987 spinning Methods 0.000 claims description 26
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 238000005238 degreasing Methods 0.000 claims description 17
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 14
- 238000002425 crystallisation Methods 0.000 claims description 14
- 230000008025 crystallization Effects 0.000 claims description 14
- 239000012784 inorganic fiber Substances 0.000 claims description 14
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 12
- 229910052863 mullite Inorganic materials 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000011550 stock solution Substances 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 26
- 239000003054 catalyst Substances 0.000 description 9
- 230000007423 decrease Effects 0.000 description 6
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- -1 and among them Inorganic materials 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000002336 sorption--desorption measurement Methods 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000013065 commercial product Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000012779 reinforcing material Substances 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010421 standard material Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4209—Inorganic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/02—Boron or aluminium; Oxides or hydroxides thereof
- B01J21/04—Alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/12—Silica and alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/58—Fabrics or filaments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/04—Mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62227—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining fibres
- C04B35/62231—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining fibres based on oxide ceramics
- C04B35/62236—Fibres based on aluminium oxide
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62227—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining fibres
- C04B35/62231—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining fibres based on oxide ceramics
- C04B35/6224—Fibres based on silica
- C04B35/62245—Fibres based on silica rich in aluminium oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
- C04B35/62675—Thermal treatment of powders or mixtures thereof other than sintering characterised by the treatment temperature
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5409—Particle size related information expressed by specific surface values
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- C—CHEMISTRY; METALLURGY
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6021—Extrusion moulding
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/606—Drying
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- C—CHEMISTRY; METALLURGY
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/74—Physical characteristics
- C04B2235/77—Density
Definitions
- the present invention relates to an alumina fiber assembly, a method for producing the same, and use.
- exhaust gas treatment apparatuses have been used for the purpose of detoxifying NOx, PM, etc. contained in exhaust gas discharged from internal combustion engines such as vehicle engines and construction machinery.
- the exhaust gas treatment apparatus has a structure in which a catalyst carrier made of ceramics or the like is accommodated in a catalyst casing having a structure such as a metal shell.
- a gripping material is sandwiched between the catalyst carrier and the catalyst casing.
- the holding material has a purpose of fixing the catalyst carrier to prevent breakage due to vibration and a purpose as an exhaust gas sealing material, and an alumina fiber aggregate is mainly used (see, for example, Patent Document 1).
- Patent Document 2 discloses a manufacturing method in which an alumina fiber assembly is subjected to a firing step after a spinning step, a chop step, and a mat manufacturing step. That is, in the production method described in Patent Document 2, the continuous long fiber precursor obtained in the spinning process is cut into a short fiber precursor by cutting with a cutter or the like at the time of a soft state before performing the firing treatment. It is a feature.
- Alumina short fibers obtained through such a process have high mechanical strength and small variation compared to alumina short fibers obtained by cutting after the firing treatment, since almost no chipping or microcracks are generated on the cut surface.
- an alumina fiber aggregate that has a sufficiently high initial surface pressure and hardly deteriorates with time can be obtained.
- the decrease in the surface pressure of the alumina fiber aggregate is caused by impurities existing in the alumina fiber aggregate, pores and defects derived from the production conditions, etc. It came to know that it originates in a weak part. According to the knowledge of the present inventors, the reduction of the surface pressure is caused by the fiber being easily broken starting from these fragile sites when stress is applied to the fiber. Therefore, in order to maintain the high surface pressure inherent to the alumina fiber aggregate, the fine structure of the alumina fiber aggregate needs to be dense without containing pores or defects.
- the alumina fiber assembly according to any one of (1) to (5), wherein the surface pressure when compressed to a bulk density of 0.3 g / cm 3 is 15 N / cm 2 or more.
- (11) (I) A step of obtaining a viscous spinning stock solution by mixing an inorganic fiber source and a spinning aid and concentrating under reduced pressure. (II) A precursor by extruding the spinning stock solution into the atmosphere from the pores and drying.
- step (III) a step of firing the precursor, in this order, a method for producing an alumina fiber assembly
- the precursor firing step in the step (III) A degreasing step of firing to 800 ° C. at a firing rate of 3 ° C./min or less while exhausting 0.1 to 3 Nm 3 / h per kg of the precursor;
- (12) A holding material for an exhaust gas purifying apparatus comprising the alumina fiber aggregate according to any one of (1) to (10) above.
- the alumina fiber aggregate of the present invention is characterized by having a chemical composition of Al 2 O 3 70% or more and less than 90% and a total pore volume of 0.0055 ml / g or less.
- alumina fiber aggregate of the present invention will be described in detail.
- the mineral composition of the alumina fiber aggregate of the present invention preferably has a mullite ratio (3Al 2 O 3 ⁇ 2SiO 2 ), that is, a mullite conversion rate of 5% or less.
- a mullite ratio (3Al 2 O 3 ⁇ 2SiO 2 )
- the mullite conversion rate exceeds 5%, the fiber strength is lowered and the surface pressure is lowered.
- the mullitization rate at this time is a value represented by the equation (1).
- Formula (1) Mineral composition (mullite conversion rate) h / h 0 ⁇ 100.
- the total pore volume of the alumina fiber aggregate of the present invention is 0.0055 ml / g or less, more preferably 0.003 ml / g or less. By setting the total pore volume to be equal to or less than the above numerical value, a high surface pressure can be obtained. This total pore volume is a value that is achieved for the first time by the manufacturing conditions described later.
- the specific surface area of the alumina fiber aggregate of the present invention is preferably 5 m 2 / g or less, and more preferably 2 m 2 / g or less. If the specific surface area is large, the brittleness of the alumina fiber aggregate becomes remarkable, and it may be difficult to obtain a sufficient surface pressure.
- sample preparation 50 g of the produced alumina fiber aggregate is weighed.
- the weighed alumina fiber aggregate is put into a cylindrical cylinder with a bottom having an inner diameter of 80 mm and compressed with a pressure of 2058 N / cm 2 . Once the pressure is released to loosen the fibers in the cylinder, it is compressed again at the same pressure.
- the compressed sample is passed through a 600 ⁇ m sieve, and 3 g is sampled from the sample that has passed through the sieve and used for measurement.
- a gas adsorption / desorption measuring device for example, OMISORP 360CX manufactured by Beckman Coulter, Inc.
- Degassing is performed at 100 ° C.
- the total pore volume of the present invention is the sum of the volumes of pores having a radius of 0.01 ⁇ m or more.
- the ceramic catalyst carrier When the alumina fiber aggregate is used as a holding material for a catalyst carrier, the ceramic catalyst carrier is generally accommodated in a compressed state until the bulk density is in the range of 0.3 to 0.5 g / cm 3. Is introduced into a catalyst casing such as a metal shell. If a sufficiently high surface pressure is not maintained within this bulk density range, the holding force becomes insufficient, and the ceramic catalyst carrier may be damaged by vibration during use. Therefore, in order to be applicable as a gripping material for exhaust gas purifying apparatuses such as automobiles that generate particularly severe vibrations, the surface pressure of the alumina fiber assembly is 15 N / at a bulk density of 0.3 g / cm 3.
- It is preferably at least cm 2, and at a bulk density of 0.4 g / cm 3 , it is preferably at least 40 N / cm 2 . Further, when the bulk density is 0.5 g / cm 3 , it is preferably 90 N / cm 2 or more, and more preferably 100 N / cm 2 or more.
- the contact pressure referred to in the present invention can be measured using a tensile compression tester. The measurement method will be described in detail below.
- a tensile compression tester (for example, an autograph manufactured by Shimadzu Corporation) is used for the measurement.
- the alumina fiber aggregate is punched into a cylindrical shape with a bottom area of 10.2 cm 3 and compressed at a test speed of 10 mm / min.
- the repulsive force when the bulk density becomes 0.3, 0.4, 0.5 g / cm 3 is measured.
- the surface pressure can be obtained by multiplying each repulsive force by the bottom area.
- the method for producing an alumina fiber assembly includes: (I) a step of obtaining a viscous spinning stock solution by mixing an inorganic fiber source (alumina source, silica source) and a spinning aid and concentrating under reduced pressure; (II) A step of obtaining a precursor by extruding the spinning dope into the atmosphere from the pores and drying. (III) a step of firing the precursor; It is composed of
- an aluminum oxychloride aqueous solution, alumina sol or the like can be used as the alumina source, and for example, silica sol or polysiloxane can be used as the silica source.
- silica sol or polysiloxane can be used as the silica source.
- Polyvinyl alcohol, Polyethylene glycol or the like can be used. These are mixed in a desired ratio and concentrated under reduced pressure to obtain a spinning dope.
- the prepared spinning dope is extruded from the pores into the atmosphere to become a precursor.
- the spinning device used in this step and a blowing spinning device, a rotating disk spinning device, or the like can be used.
- the spinning method described in Japanese Patent Application Laid-Open No. 2010-31416 is preferable from the viewpoint of preventing fusion of fibers extruded from the pores and producing an alumina fiber aggregate having a high surface pressure. Used.
- the obtained precursor is fired.
- the firing step is particularly important.
- the degreasing step and the crystallization step are performed in this order.
- the baking rate in the degreasing step is 3 ° C./min or less.
- a decomposition reaction of moisture, hydrochloric acid, and organic substances contained in the precursor occurs, and a baked product is generated, and the volume of the precursor shrinks rapidly.
- the firing rate is higher than 3 ° C./minute, volume shrinkage occurs without sufficient decomposition of moisture, hydrochloric acid, and organic matter.
- the fiber contains many defects, and the surface pressure is significantly reduced.
- firing is performed at a firing rate of 3 ° C./min or less until 800 ° C. is reached.
- the crystallization process it is possible to control the mineral composition of the alumina fiber aggregate by changing the maximum firing temperature.
- the crystallization process in the present invention may be performed under normal conditions (temperature and holding time) that cause the crystallization of the inorganic fiber source.
- the heat resistant temperature and the excellent surface pressure suitable for the holding material of the exhaust gas purifying apparatus In order to achieve the above, a step of holding at a maximum firing temperature of 1000 to 1230 ° C. for 5 to 60 minutes is preferable.
- the crystallization temperature is lower than 1000 ° C., the heat resistance of the alumina fiber aggregate is lowered, and it may not be suitable for the use temperature of the gripping material of the exhaust gas purification apparatus.
- the alumina fiber aggregate of the present invention can be used as a gripping material for an exhaust gas purification device, and is particularly suitable as a gripping material for an automobile exhaust gas purification device.
- it can be used as an insulator against heat or sound, a filler such as plastic or film, a reinforcing material, and a reinforcing material that improves tensile strength and wear strength.
- Example 1-1 After mixing 3650 g of an aluminum oxychloride aqueous solution having an Al 2 O 3 concentration of 20.0 mass%, 1286 g of silica sol having an SiO 2 concentration of 21 mass%, and 800 g of an aqueous solution of polyvinyl alcohol (degree of polymerization 1700) (concentration 10 mass%), Concentrated under reduced pressure to prepare a spinning dope with a viscosity of 3500 mPa ⁇ s.
- This spinning dope is discharged from a diameter of 0.2 mm (pore spacing: 3.5 mm) provided on the side wall of a 350 mm diameter hollow disk rotating at a rotation speed of 2600 rpm to form a liquid yarn, which is then suspended in hot air at 200 ° C. While being dried, it was conveyed to a cotton collection chamber that sucked from the bottom, and the precursor fibers were accumulated.
- Firing is a degreasing step up to 800 ° C., and the temperature is continuously raised at 3 ° C./min while evacuating 1.5 Nm 3 / h per kg of the precursor.
- the process was heated at a rate of 20 ° C./min and held at 1200 ° C. for 30 minutes.
- Example 1-2 Comparative Examples 1-1 to 1-2
- An alumina fiber assembly was produced in the same manner as in Example 1-1 except that the chemical composition was changed.
- the physical properties of the obtained alumina fiber aggregate are shown in Table 1.
- Example 2-1 and Comparative Example 2-1 An alumina fiber aggregate was produced in the same manner as in Example 1-1, except that the firing rate in the degreasing process was changed. Table 2 shows the physical properties of the obtained alumina fiber aggregate.
- the alumina fiber aggregate of the present invention can be produced only by combining a specific amount of Al 2 O 3 and specific production conditions. Moreover, according to the manufacturing method of this invention, it becomes possible to manufacture easily the alumina fiber assembly which expresses a high surface pressure using the conventional apparatus etc. On the other hand, when the mullite conversion rate exceeds 5%, the surface pressure is remarkably reduced. Therefore, it is desirable to control the mullite conversion rate to 5% or less by adjusting the temperature and holding time of the crystallization process.
- the alumina-based fiber aggregate of the present invention has a dense structure as compared with conventional alumina-based fibers and has a high surface pressure, and thus can be used as a gripping material for an exhaust gas purifying apparatus such as an automobile.
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Abstract
Description
これに対して例えば特許文献2では、アルミナ質繊維集合体を紡糸工程、チョップ工程およびマット作製工程を経た後に焼成工程を行なう製造方法を開示している。即ち、特許文献2に記載される製法は、紡糸工程で得られた連続長繊維前駆体を、焼成処理を施す前の柔らかい状態の時点でカッター等により切断して短繊維前駆体とすることを特徴としている。かかる工程を経て得られたアルミナ短繊維は、焼成処理後に切断されて得られるアルミナ短繊維と比較して切断面の欠けやマイクロクラックが殆ど発生しないため、機械的強度が高く、ばらつきが小さいものとなり、これにより初期面圧が充分に高く、経時劣化を起こしにくいアルミナ質繊維集合体が得られると記載している。
また、本発明の他の目的は、上記アルミナ質繊維集合体を用いた排ガス浄化装置用把持材を提供することにある。
そこで、本発明者等はアルミナ質繊維集合体の微細構造を緻密化すべく検討した結果、アルミナ配合量と製造条件とを調整することで、顕著に繊維強度と緻密性に優れ、自動車等の排ガス浄化装置用把持材として適用可能な高い面圧を有する新規なアルミナ質繊維集合体を形成できることを見出した。
即ち、本発明は下記の通りである。
(2)Al2O3とSiO2の2成分を無機繊維として構成されるアルミナ質繊維集合体であり、化学組成がAl2O370%以上90%未満で、全細孔容積が0.0055ml/g以下である上記(1)記載のアルミナ質繊維集合体。
(3)(I)無機繊維源および紡糸助剤を混合し減圧濃縮することで粘調な紡糸原液を得る工程、(II)紡糸原液を細孔より大気中に押出し、乾燥することで前駆体を得る工程、(III)前駆体を焼成する工程、をこの順に有する製造方法によって得られた上記(1)または(2)記載のアルミナ質繊維集合体であり、
前記工程(III)における前駆体の焼成工程が、
前駆体1kg当たり0.1~3Nm3/hの排気を行いながら、3℃/毎分以下の焼成速度で800℃となるまで焼成する脱脂工程と、
脱脂工程後、無機繊維源を焼成して結晶化させる結晶化工程と、を有するアルミナ質繊維集合体。
(4)ムライト化率が5%以下である上記(1)~(3)の何れか一項に記載のアルミナ質繊維集合体。
(5)比表面積が5m2/g以下である上記(1)~(4)の何れか一項に記載のアルミナ質繊維集合体。
(6)かさ密度0.5g/cm3に圧縮したときの面圧が90N/cm2以上である上記(1)~(5)の何れか一項に記載のアルミナ質繊維集合体。
(7)かさ密度0.5g/cm3に圧縮したときの面圧が100N/cm2以上である上記(1)~(5)の何れか一項に記載のアルミナ質繊維集合体。
(8)かさ密度0.4g/cm3に圧縮したときの面圧が40N/cm2以上である上記(1)~(5)の何れか一項に記載のアルミナ質繊維集合体。
(9)かさ密度0.3g/cm3に圧縮したときの面圧が15N/cm2以上である上記(1)~(5)の何れか一項に記載のアルミナ質繊維集合体。
(10)自動車排ガス浄化装置用把持材に使用される上記(1)~(9)の何れか一項に記載のアルミナ質繊維集合体。
(11)(I)無機繊維源および紡糸助剤を混合し減圧濃縮することで粘調な紡糸原液を得る工程、(II)紡糸原液を細孔より大気中に押出し、乾燥することで前駆体を得る工程、(III)前駆体を焼成する工程、をこの順に有するアルミナ質繊維集合体の製造方法であって、
前記工程(III)における前駆体の焼成工程が、
前駆体1kg当たり0.1~3Nm3/hの排気を行いながら、3℃/毎分以下の焼成速度で800℃となるまで焼成する脱脂工程と、
脱脂工程後、無機繊維源を焼成して結晶化させる結晶化工程と、を有する上記(1)~(10)の何れか一項に記載したアルミナ質繊維集合体の製造方法。
(12)上記(1)~(10)の何れか一項に記載のアルミナ質繊維集合体からなる排ガス浄化装置用把持材。
以下、本発明のアルミナ質繊維集合体について詳細に説明する。
本発明のアルミナ質繊維集合体は、Al2O3以外の成分としてSiO2、Fe2O3、MgO、CuO、Na2O、ZnO、CaO等が含まれていても良いが、中でもSiO2を無機繊維として含むことが好ましく、Al2O3とSiO2の2成分を無機繊維として構成されたものであることが特に好ましい。SiO2を含んで構成されることで、α-アルミナの粗大結晶の成長が抑制され、面圧が向上する。
アルミナ質繊維集合体の化学組成は蛍光X線分析等を用いて測定することが出来る。
式(1)鉱物組成(ムライト化率)=h/h0×100 である。
さらに、本発明のアルミナ質繊維集合体は、その比表面積が5m2/g以下であることが好ましく、2m2/g以下であることがより好ましい。比表面積が大きいとアルミナ質繊維集合体の脆性が顕著となり十分な面圧が得られ難いことがある。
製造されたアルミナ質繊維集合体50gを計量する。内径80mmの底付き円筒状シリンダーに計量したアルミナ質繊維集合体を入れ、2058N/cm2の圧力で圧縮する。一旦圧力を解放してシリンダー内の繊維をほぐした後、再び同じ圧力で圧縮する。圧縮した試料を600μm篩にかけ、篩を通過した試料から3gを分採し測定に用いる。(測定)
測定にはガス吸脱着測定装置(例えばベックマン・コールター社製 OMNISORP360CX)が用いられる。脱気は100℃で14時間行い、吸着ガスには流量0.3ml/分の窒素ガスを用い、連続容量法による吸脱着測定を行う。なお、細孔径分布の適用手法はBJH法である。
本発明の全細孔容積は半径が0.01μm以上である細孔の容積の総和である。
本発明のアルミナ質繊維集合体の製造方法は、
(I)無機繊維源(アルミナ源、シリカ源)、紡糸助剤を混合し減圧濃縮することで粘調な紡糸原液を得る工程、
(II)紡糸原液を細孔より大気中に押出し、乾燥することで前駆体を得る工程、
(III)前駆体を焼成する工程、
から構成されている。
脱脂工程の焼成速度は3℃/分以下である。脱脂工程では前駆体に含まれる水分、塩酸分、有機物の分解反応が生じるとともに焼成生成物が発生し、前駆体の体積が急激に収縮する。焼成速度が3℃/分より大きいと、水分、塩酸分、有機物の分解が十分に起こらないまま体積の収縮が起こる。この結果、欠陥を多く含む繊維となり、面圧が著しく低下する。脱脂工程では3℃/分以下の焼成速度で800℃となるまで焼成を行なう。
本発明における結晶化工程は、無機繊維源の結晶化を生じさせる通常の条件(温度・保持時間)で焼成を行なえば良いが、排ガス浄化装置の把持材に適した耐熱温度と優れた面圧とを達成するために、最高焼成温度1000~1230℃で5~60分保持する工程とすることが好ましい。結晶化温度が1000℃より低いとアルミナ質繊維集合体の耐熱性が低下し、排ガス浄化装置の把持材の使用温度に適さなくなることがある。一方、1230℃より高いと、ムライト化等のアルミナ質繊維集合体の結晶化が進みすぎて繊維強度が低下し、面圧が低下することがある。最高温度での保持時間が5分より短いと結晶化が十分に進まないことから焼きムラが発生し、アルミナ質繊維集合体の面圧が低下することがある。保持時間が60分より長いとアルミナ質繊維の結晶成長が進み、面圧が低下することがある。
Al2O3濃度が20.0質量%のオキシ塩化アルミニウム水溶液3650gとSiO2濃度が21質量%のシリカゾル1286g、ポリビニルアルコール(重合度1700)の水溶液(濃度10質量%)800gを混合した後、減圧濃縮し、粘度3500mPa・sの紡糸原液を調製した。
化学組成を変えたこと以外、実施例1-1と同様にアルミナ質繊維集合体を製造した。得られたアルミナ質繊維集合体の物性を表1に示す。
脱脂工程の焼成速度を変えたこと以外は、実施例1-1と同様にアルミナ質繊維集合体を製造した。得られたアルミナ質繊維集合体の物性を表2に示す。
前駆体1kg当たりの排気量を変えたこと以外、実施例1-1と同様にアルミナ質繊維集合体を製造した。得られたアルミナ質繊維集合体の物性を表3に示す。
結晶化工程の最高焼成温度、保持時間を変えたこと以外、実施例1-1と同様にアルミナ質繊維集合体を製造した。得られたアルミナ質繊維集合体の物性を表4に示す。
以下、参考として、市販されているアルミナ質繊維(市販品A及び市販品B)について、全細孔容積、比表面積、ムライト化率、面圧を測定した結果を表5に示す。
なお、本出願は、2012年10月31日付で出願された日本国特許出願(特願2012-240883)に基づいており、その全体が引用により援用される。また、ここに引用されるすべての参照は全体として取り込まれる。
Claims (12)
- 化学組成がAl2O370%以上90%未満で、全細孔容積が0.0055ml/g以下であるアルミナ質繊維集合体。
- Al2O3とSiO2の2成分を無機繊維として構成されるアルミナ質繊維集合体であり、化学組成がAl2O370%以上90%未満で、全細孔容積が0.0055ml/g以下である請求項1記載のアルミナ質繊維集合体。
- (I)無機繊維源および紡糸助剤を混合し減圧濃縮することで粘調な紡糸原液を得る工程、(II)紡糸原液を細孔より大気中に押出し、乾燥することで前駆体を得る工程、(III)前駆体を焼成する工程、をこの順に有する製造方法によって得られた請求項1または2記載のアルミナ質繊維集合体であり、
前記工程(III)における前駆体の焼成工程が、
前駆体1kg当たり0.1~3Nm3/hの排気を行いながら、3℃/毎分以下の焼成速度で800℃となるまで焼成する脱脂工程と、
脱脂工程後、無機繊維源を焼成して結晶化させる結晶化工程と、を有するアルミナ質繊維集合体。 - ムライト化率が5%以下である請求項1~3の何れか一項に記載のアルミナ質繊維集合体。
- 比表面積が5m2/g以下である請求項1~4の何れか一項に記載のアルミナ質繊維集合体。
- かさ密度0.5g/cm3に圧縮したときの面圧が90N/cm2以上である請求項1~5の何れか一項に記載のアルミナ質繊維集合体。
- かさ密度0.5g/cm3に圧縮したときの面圧が100N/cm2以上である請求項1~5の何れか一項に記載のアルミナ質繊維集合体。
- かさ密度0.4g/cm3に圧縮したときの面圧が40N/cm2以上である請求項1~5の何れか一項に記載のアルミナ質繊維集合体。
- かさ密度0.3g/cm3に圧縮したときの面圧が15N/cm2以上である請求項1~5の何れか一項に記載のアルミナ質繊維集合体。
- 自動車排ガス浄化装置用把持材に使用される請求項1~9の何れか一項に記載のアルミナ質繊維集合体。
- (I)無機繊維源および紡糸助剤を混合し減圧濃縮することで粘調な紡糸原液を得る工程、(II)紡糸原液を細孔より大気中に押出し、乾燥することで前駆体を得る工程、(III)前駆体を焼成する工程、をこの順に有するアルミナ質繊維集合体の製造方法であって、
前記工程(III)における前駆体の焼成工程が、
前駆体1kg当たり0.1~3Nm3/hの排気を行いながら、3℃/毎分以下の焼成速度で800℃となるまで焼成する脱脂工程と、
脱脂工程後、無機繊維源を焼成して結晶化させる結晶化工程と、を有する請求項1~10の何れか一項に記載のアルミナ質繊維集合体の製造方法。 - 請求項1~10の何れか一項に記載のアルミナ質繊維集合体からなる排ガス浄化装置用把持材。
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Also Published As
Publication number | Publication date |
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CN104884690A (zh) | 2015-09-02 |
JP6249956B2 (ja) | 2017-12-20 |
BR112015009595A2 (pt) | 2017-07-04 |
EP2915909A1 (en) | 2015-09-09 |
US9827553B2 (en) | 2017-11-28 |
JPWO2014069589A1 (ja) | 2016-09-08 |
US20150251163A1 (en) | 2015-09-10 |
BR112015009595B1 (pt) | 2022-08-23 |
CN104884690B (zh) | 2018-04-03 |
EP2915909A4 (en) | 2016-06-08 |
HUE052636T2 (hu) | 2021-05-28 |
EP2915909B1 (en) | 2020-10-14 |
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