CN114316452A - Super-hydrophobic foamed polypropylene and preparation method thereof - Google Patents
Super-hydrophobic foamed polypropylene and preparation method thereof Download PDFInfo
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- CN114316452A CN114316452A CN202210006432.8A CN202210006432A CN114316452A CN 114316452 A CN114316452 A CN 114316452A CN 202210006432 A CN202210006432 A CN 202210006432A CN 114316452 A CN114316452 A CN 114316452A
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- polypropylene
- foaming agent
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- -1 polypropylene Polymers 0.000 title claims abstract description 86
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 81
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 81
- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 42
- 150000001343 alkyl silanes Chemical class 0.000 claims abstract description 27
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 17
- 239000000654 additive Substances 0.000 claims abstract description 15
- 230000000996 additive effect Effects 0.000 claims abstract description 15
- 238000006757 chemical reactions by type Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 239000004088 foaming agent Substances 0.000 claims description 41
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 14
- 239000003963 antioxidant agent Substances 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 13
- 239000005543 nano-size silicon particle Substances 0.000 claims description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000003078 antioxidant effect Effects 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 150000002978 peroxides Chemical class 0.000 claims description 6
- SLYCYWCVSGPDFR-UHFFFAOYSA-N octadecyltrimethoxysilane Chemical compound CCCCCCCCCCCCCCCCCC[Si](OC)(OC)OC SLYCYWCVSGPDFR-UHFFFAOYSA-N 0.000 claims description 5
- PMQIWLWDLURJOE-UHFFFAOYSA-N triethoxy(1,1,2,2,3,3,4,4,5,5,6,6,7,7,10,10,10-heptadecafluorodecyl)silane Chemical compound CCO[Si](OCC)(OCC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F PMQIWLWDLURJOE-UHFFFAOYSA-N 0.000 claims description 5
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 4
- 239000004156 Azodicarbonamide Substances 0.000 claims description 4
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 4
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical group NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 3
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 3
- 239000012965 benzophenone Substances 0.000 claims description 3
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 3
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 3
- ZAADUWCLWTWDSZ-UHFFFAOYSA-N dichloro-dodecyl-methylsilane Chemical compound CCCCCCCCCCCC[Si](C)(Cl)Cl ZAADUWCLWTWDSZ-UHFFFAOYSA-N 0.000 claims description 3
- SCPWMSBAGXEGPW-UHFFFAOYSA-N dodecyl(trimethoxy)silane Chemical compound CCCCCCCCCCCC[Si](OC)(OC)OC SCPWMSBAGXEGPW-UHFFFAOYSA-N 0.000 claims description 3
- PELGKMTVNFFDDL-UHFFFAOYSA-N dodecyl-dimethoxy-methylsilane Chemical group CCCCCCCCCCCC[Si](C)(OC)OC PELGKMTVNFFDDL-UHFFFAOYSA-N 0.000 claims description 3
- RSKGMYDENCAJEN-UHFFFAOYSA-N hexadecyl(trimethoxy)silane Chemical compound CCCCCCCCCCCCCCCC[Si](OC)(OC)OC RSKGMYDENCAJEN-UHFFFAOYSA-N 0.000 claims description 3
- 239000003999 initiator Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000002667 nucleating agent Substances 0.000 claims description 3
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 3
- 150000007970 thio esters Chemical class 0.000 claims description 3
- BNCXNUWGWUZTCN-UHFFFAOYSA-N trichloro(dodecyl)silane Chemical compound CCCCCCCCCCCC[Si](Cl)(Cl)Cl BNCXNUWGWUZTCN-UHFFFAOYSA-N 0.000 claims description 3
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 claims description 2
- 239000002530 phenolic antioxidant Substances 0.000 claims description 2
- BPCXHCSZMTWUBW-UHFFFAOYSA-N triethoxy(1,1,2,2,3,3,4,4,5,5,8,8,8-tridecafluorooctyl)silane Chemical compound CCO[Si](OCC)(OCC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F BPCXHCSZMTWUBW-UHFFFAOYSA-N 0.000 claims description 2
- 150000008366 benzophenones Chemical class 0.000 claims 1
- 150000001565 benzotriazoles Chemical class 0.000 claims 1
- 150000003918 triazines Chemical class 0.000 claims 1
- 238000001125 extrusion Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000000155 melt Substances 0.000 abstract description 2
- 230000002745 absorbent Effects 0.000 description 9
- 239000002250 absorbent Substances 0.000 description 9
- 238000005187 foaming Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 5
- 239000002352 surface water Substances 0.000 description 3
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 2
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 2
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 2
- 239000012964 benzotriazole Substances 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- FOAFYQVMBKJRSC-UHFFFAOYSA-N triethoxy-(1,1,2,2,3,3,4,5,5,6,10,10,10-tridecafluoro-4-methyldecyl)silane Chemical compound CC(C(C(C(F)(F)[Si](OCC)(OCC)OCC)(F)F)(F)F)(C(C(CCCC(F)(F)F)F)(F)F)F FOAFYQVMBKJRSC-UHFFFAOYSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
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Abstract
The invention discloses a super-hydrophobic foamed polypropylene and a preparation method thereof, the super-hydrophobic foamed polypropylene comprises polypropylene, reaction type long-chain alkyl silane, nano-silica and an additive, the reaction type long-chain alkyl silane and the polypropylene form a microstructure on the surface of the polypropylene through a grafting reaction, the nano-silica is embedded in the microstructure, and the grafting ratio of the reaction type long-chain alkyl silane is 1-30%. According to the super-hydrophobic foamed polypropylene and the preparation method thereof disclosed by the invention, the polypropylene forms a surface microstructure by a grafting reaction of the reactive long-chain alkyl silane and the polypropylene during melt extrusion, and the surface forms a super-hydrophobic nano-microstructure by embedding the nano-silica, so that the super-hydrophobic effect is achieved, the melt strength of the polypropylene is improved, and the super-hydrophobic foamed polypropylene is more suitable for production of foamed polypropylene.
Description
Technical Field
The invention belongs to the technical field of hydrophobic coatings, and particularly relates to super-hydrophobic foamed polypropylene and a preparation method thereof.
Background
Due to the large dielectric constant of water, the electromagnetic waves emitted by radars, signal base stations and the like are generally attenuated by rain water, which is called a rain attenuation phenomenon. Particularly, rain films are formed on the radome and the antenna cover in rainy days, and serious attenuation is caused to signals. In order to reduce the problem of rain attenuation, the radome can be made into super-hydrophobic, so that a water film cannot be formed.
The radome material is usually a fiber reinforced resin composite material, mainly made of glass fiber reinforced plastics, but the specific gravity of the glass fiber reinforced plastics is large, and in order to meet the lightweight design of the antenna, the foamed high polymer material is an ideal material, because the foamed material generally has a lower density and a lower dielectric constant.
At present, no report related to the super-hydrophobic foamed polypropylene is found. Therefore, the invention provides a preparation method of super-hydrophobic foamed polypropylene, which is applied to the fields of radar covers, 5G antenna covers and the like, meets the requirement of light weight, has the function of rain attenuation resistance, and fills the market blank.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a super-hydrophobic foamed polypropylene and a preparation method thereof.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
the preparation raw materials of the super-hydrophobic foamed polypropylene comprise polypropylene, reactive long-chain alkyl silane, nano-silica and an additive, wherein the reactive long-chain alkyl silane and the polypropylene form a microstructure on the surface of the polypropylene through a grafting reaction, the nano-silica is embedded in the microstructure, and the grafting ratio of the reactive long-chain alkyl silane is 1-30%.
Further, the super-hydrophobic foamed polypropylene comprises the following components in percentage by weight:
80-98.5 wt% of polypropylene, 0.5-5 wt% of reactive long-chain alkyl silane, 0.5-5 wt% of nano silicon dioxide and 0.5-10 wt% of additive.
Further, the density of the super-hydrophobic foamed polypropylene is 0.01-0.15g/cm3Cell size 5-100 μm, cell density>109Per m3Dielectric constant of<1.8。
Further, the reactive long-chain alkylsilane is one or more of methyldodecyldimethoxysilane, dodecylmethyldichlorosilane, dodecyltrichlorosilane, hexadecyltrimethoxysilane, octadecyltrimethoxysilane, dodecyltrimethoxysilane, tridecafluorooctyloxysilane, heptadecafluorodecyltriethoxysilane and 4-methyl-tridecafluordecyltriethoxysilane.
Further, the particle size of the nano-silica is 5-100nm, and the specific surface area is 150-300m2/g。
Further, the additive is one or more of peroxide, initiator, foaming agent, nucleating agent, antioxidant and ultraviolet absorbent.
Further, the peroxide is selected from one or more of dicumyl peroxide, di-tert-butyl peroxide and benzoyl peroxide.
Further, the foaming agent is a physical foaming agent or a chemical foaming agent; the physical foaming agent is carbon dioxide and/or nitrogen; the chemical foaming agent is azodicarbonamide; when the foaming agent is a physical foaming agent, a supercritical foaming extrusion process can be adopted, and when the foaming agent is a chemical foaming agent, a chemical extrusion foaming process can be adopted.
Further, the antioxidant is one or a combination of more of phenolic antioxidants, phosphite antioxidants and thioester antioxidants, and the ultraviolet absorber is one or a combination of more of benzotriazole, benzophenone and triazine ultraviolet absorbers.
The invention discloses a preparation method of super-hydrophobic foamed polypropylene, which comprises the following steps:
when the foaming agent is a physical foaming agent, adding polypropylene, reactive long-chain alkyl silane, nano silicon dioxide and an additive into a high-pressure kettle, filling the physical foaming agent, heating to the temperature of 200-230 ℃ until the mixture is molten, continuing for 5-60s, opening a pressure release valve to quickly release pressure, and then putting the mixture into cold water at the temperature of 10-40 ℃ to cool and shape, so as to obtain foamed polypropylene;
when the foaming agent is a chemical foaming agent, polypropylene, reactive long-chain alkyl silane, nano silicon dioxide and an additive are added into an extruder, and the mixture is heated, melted and extruded at the temperature of 200-.
Compared with the prior art, the invention has the beneficial effects that:
1. the reactive long-chain alkyl silane and the polypropylene are subjected to grafting reaction during melt extrusion, the grafted polypropylene can form a surface microstructure, and the surface of the polypropylene is formed into a super-hydrophobic nano-microstructure by embedding the nano-silica, so that the super-hydrophobic effect is achieved;
2. the grafting of the reaction type long-chain alkyl silane improves the melt strength of the polypropylene, and is more suitable for the production of the foamed polypropylene.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the scope of the present invention is more clearly defined.
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On one hand, the invention discloses super-hydrophobic foamed polypropylene, which is prepared from the following raw materials in parts by weight: 80-98.5 wt% of polypropylene, 0.5-5 wt% of reactive long-chain alkyl silane, 0.5-5 wt% of nano silicon dioxide, 0.5-10 wt% of additive and 1-30 wt% of grafting rate of reactive long-chain alkyl silane. The density of the super-hydrophobic foaming polypropylene obtained by the invention is 0.01-0.15g/cm3Cell size 5-100 μm, cell density>109Per m3Dielectric constant of<1.8, the density of the polypropylene is reduced through foaming, the dielectric strength is reduced, and the foaming material with low dielectric strength is more suitable for 5G and radar antennas.
According to the invention, the reaction type long-chain alkyl silane and the nano-silica are added into the preparation raw materials, the grafting reaction of the reaction type long-chain alkyl silane and the embedding of the nano-silica are completed by utilizing melt extrusion, a microstructure is formed on the surface of polypropylene, and the nano-silica is embedded in the microstructure to construct a super-hydrophobic nano-microstructure, so that the super-hydrophobic nano-microstructure has a good super-hydrophobic effect.
The polypropylene is polypropylene or modified polypropylene, and the modified polypropylene is an alloy of polypropylene and a thermoplastic elastomer.
The reactive long-chain alkylsilane is one or more of methyldodecyldimethoxysilane, dodecylmethyldichlorosilane, dodecyltrichlorosilane, hexadecyltrimethoxysilane, octadecyltrimethoxysilane, dodecyltrimethoxysilane, tridecafluorooctyltriethoxysilane, heptadecafluorodecyltriethoxysilane and 4-methyl-tridecafluordecyltriethoxysilane.
The particle size of the nano silicon dioxide is 5-100nm, the specific surface area is 150-2Preferably, the particle diameter of the nano-silica is 15-45nm, the specific surface area is 200-300m2/g。
The additive is one or more of peroxide, initiator, foaming agent, nucleating agent, antioxidant and ultraviolet absorbent. Wherein, the peroxide is selected from one or more of dicumyl peroxide, di-tert-butyl peroxide and benzoyl peroxide; the foaming agent is a physical foaming agent or a chemical foaming agent; the physical foaming agent is carbon dioxide and/or nitrogen; the chemical foaming agent is azodicarbonamide; when the foaming agent is a physical foaming agent, a supercritical foaming extrusion process can be adopted, and when the foaming agent is a chemical foaming agent, a chemical extrusion foaming process can be adopted.
The antioxidant is one or more of phenol antioxidant, phosphite antioxidant and thioester antioxidant, and the ultraviolet absorbent is one or more of benzotriazole, benzophenone and triazine ultraviolet absorbent.
The invention discloses a preparation method of super-hydrophobic foamed polypropylene, which comprises the following steps:
when the foaming agent is a physical foaming agent, adding polypropylene, reactive long-chain alkyl silane, nano silicon dioxide and an additive into a high-pressure kettle, filling the physical foaming agent, heating to the temperature of 200-230 ℃ until the mixture is molten, continuing for 5-60s, opening a pressure release valve to quickly release pressure, and then putting the mixture into cold water at the temperature of 10-40 ℃ to cool and shape, so as to obtain foamed polypropylene;
when the foaming agent is a chemical foaming agent, polypropylene, reactive long-chain alkyl silane, nano silicon dioxide and an additive are added into an extruder, and the mixture is heated, melted and extruded at the temperature of 200-.
Example 1
95.9kg of polypropylene, 2kg of octadecyltrimethoxysilane and 2kg of nano-silica (particle size 100nm, specific surface area 150 m)2Adding/g), 0.5kg of antioxidant 1076 and 0.5kg of ultraviolet absorbent UV531 into an autoclave, filling carbon dioxide, heating to 230 ℃, continuing for 20s, opening a pressure release valve to quickly release pressure, and then putting into cold water at 30 ℃ to cool and shape, thereby obtaining the foamed polypropylene.
Example 2
95.9kg of polypropylene, 2kg of heptadecafluorodecyltriethoxysilane and 2kg of nano-silica (particle size 30nm, specific surface area 300 m)2Adding/g), 0.5kg of antioxidant 1076 and 0.5kg of ultraviolet absorbent UV531 into an autoclave, charging carbon dioxide, heating to 230 ℃, continuing for 20s, opening a pressure release valve to quickly release pressure, and then putting the foamed polypropylene into cold water at 30 ℃ for cooling and shaping to obtain the foamed polypropylene.
The same as in example 1.
Example 3
95.25kg of polypropylene, 2.5kg of heptadecafluorodecyltriethoxysilane and 2kg of nano-silica (particle size 30nm, specific surface area 300 m)2Per gram), 0.5kg of antioxidant 1076, 0.5kg of ultraviolet absorbent UV531, 0.05kg of dicumyl peroxide and 0.1kg of azodicarbonamide are put into an extruder and heated, melted and extruded at the temperature of 230 ℃ and the pressure of 12MPa to obtain the foamed polypropylene.
The same as in example 1.
Example 4
80kg of polypropylene and 0.5kg of octadecyltrimethoxysilane2kg of nano-silica (particle size 100nm, specific surface area 150 m)2Adding/g), 4kg of antioxidant 1076 and 4kg of ultraviolet absorbent UV531 into an autoclave, charging carbon dioxide, heating to 230 ℃, continuing for 20s, opening a pressure release valve to quickly release pressure, and then putting into cold water at 30 ℃ to cool and shape, thereby obtaining the foamed polypropylene.
The same as in example 1.
Example 5
80kg of polypropylene, 5kg of octadecyltrimethoxysilane and 4kg of nano-silica (particle size 100nm, specific surface area 150 m)2Adding/g), 4kg of antioxidant 1076 and 4kg of ultraviolet absorbent UV531 into an autoclave, charging carbon dioxide, heating to 230 ℃, continuing for 20s, opening a pressure release valve to quickly release pressure, and then putting into cold water at 30 ℃ to cool and shape, thereby obtaining the foamed polypropylene.
The same as in example 1.
Comparative example 1
Commercially available polypropylene sheets, having the same thickness as the expanded polypropylene of examples 1-3.
The materials of examples 1-3 and comparative example 1 were tested for dielectric constant, surface water contact angle, density, cell size, cell density.
Testing the dielectric constant by using a dielectric constant tester, and referring to GB/T1409-; testing the surface water contact angle by using a contact angle tester, and referring to GB/T30693-; density, tested with reference to GB/T6343-; and observing and calculating the size and density of the cells by adopting a scanning electron microscope. The results are shown in Table 1.
TABLE 1
| Dielectric constant | Surface water contact angle ° | Density (g/cm)3) | Bubble size (μm) | Cell density (pieces/m)3) | |
| Comparative example 1 | 2.4 | 75 | 0.91 | - | - |
| Example 1 | 1.4 | 154 | 0.06 | 25 | >109 |
| Example 2 | 1.0 | 164 | 0.03 | 10 | >109 |
| Example 3 | 1.6 | 161 | 0.08 | 36 | >109 |
The data show that the density of the foamed polypropylene in the examples 1-3 is reduced by one order of magnitude compared with the density of the foamed polypropylene in the comparative example 1, the density is less than one tenth of that of the foamed polypropylene in the comparative example 1, the dielectric constant is obviously reduced, the surface hydrophobic angle exceeds 150 degrees, the requirements of the foamed polypropylene applied to the field of radar antennas are met, and the foamed polypropylene has low dielectric property, low density and super-hydrophobic property and can play a role in resisting rain decay.
The parts which are not described in detail adopt the prior art, and can be directly purchased in the market, and are not described in detail herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The super-hydrophobic foamed polypropylene is characterized in that raw materials for preparing the super-hydrophobic foamed polypropylene comprise polypropylene, reaction type long-chain alkyl silane, nano silicon dioxide and an additive, wherein the reaction type long-chain alkyl silane and the polypropylene form a microstructure on the surface of the polypropylene through a grafting reaction, the nano silicon dioxide is embedded in the microstructure, and the grafting rate of the reaction type long-chain alkyl silane is 1-30%.
2. The superhydrophobic foamed polypropylene according to claim 1, wherein the superhydrophobic foamed polypropylene comprises, in weight percent:
80-98.5 wt% of polypropylene, 0.5-5 wt% of reactive long-chain alkyl silane, 0.5-5 wt% of nano silicon dioxide and 0.5-10 wt% of additive.
3. The superhydrophobic foamed polypropylene according to claim 1 or 2, wherein the superhydrophobic foamed polypropylene has a density of 0.01-0.15g/cm3Cell size 5-100 μm, cell density>109Per m3Dielectric constant of<1.8。
4. The superhydrophobic foamed polypropylene according to claim 1, wherein the reactive long-chain alkylsilane is methyldodecyldimethoxysilane, dodecylmethyldichlorosilane, dodecyltrichlorosilane, hexadecyltrimethoxysilane, octadecyltrimethoxysilane, dodecyltrimethoxysilane, tridecafluorooctyltriethoxysilane, heptadecafluorodecyltriethoxysilane, 4-methyl-tridecyldecyltriethoxysilane in combination with one or more kinds thereof.
5. The super hydrophobic foamed polypropylene as claimed in claim 1, wherein the nano silica has a particle size of 5-100nm and a specific surface area of 150-300m2/g。
6. The superhydrophobic foamed polypropylene according to claim 1, wherein the additive is one or more of a peroxide, an initiator, a foaming agent, a nucleating agent, an antioxidant, and an ultraviolet absorber.
7. The superhydrophobic foamed polypropylene according to claim 6, wherein the peroxide is selected from one or more of dicumyl peroxide, di-tert-butyl peroxide and benzoyl peroxide.
8. The superhydrophobic foamed polypropylene according to claim 6, wherein the foaming agent is a physical foaming agent or a chemical foaming agent; the physical foaming agent is carbon dioxide and/or nitrogen; the chemical foaming agent is azodicarbonamide.
9. The superhydrophobic foamed polypropylene according to claim 6, wherein the antioxidant is one or more selected from phenolic antioxidants, phosphite antioxidants and thioester antioxidants, and the ultraviolet absorber is one or more selected from benzotriazoles, benzophenones and triazines ultraviolet absorbers.
10. The method for preparing the superhydrophobic expanded polypropylene according to any one of claims 1-9, comprising the steps of:
when the foaming agent is a physical foaming agent, adding polypropylene, reactive long-chain alkyl silane, nano silicon dioxide and an additive into a high-pressure kettle, filling the physical foaming agent, heating to the temperature of 200-230 ℃ until the mixture is molten, continuing for 5-60s, opening a pressure release valve to quickly release pressure, and then putting the mixture into cold water at the temperature of 10-40 ℃ to cool and shape, so as to obtain foamed polypropylene;
when the foaming agent is a chemical foaming agent, polypropylene, reactive long-chain alkyl silane, nano silicon dioxide and an additive are added into an extruder, and the mixture is heated, melted and extruded at the temperature of 200-.
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Citations (31)
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