CN114316452B - Super-hydrophobic foamed polypropylene and preparation method thereof - Google Patents
Super-hydrophobic foamed polypropylene and preparation method thereof Download PDFInfo
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- CN114316452B CN114316452B CN202210006432.8A CN202210006432A CN114316452B CN 114316452 B CN114316452 B CN 114316452B CN 202210006432 A CN202210006432 A CN 202210006432A CN 114316452 B CN114316452 B CN 114316452B
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- -1 polypropylene Polymers 0.000 title claims abstract description 76
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 70
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 70
- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 28
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 28
- 150000001343 alkyl silanes Chemical class 0.000 claims abstract description 26
- 238000005187 foaming Methods 0.000 claims abstract description 19
- 239000000654 additive Substances 0.000 claims abstract description 14
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 10
- 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
- 230000002745 absorbent Effects 0.000 claims description 9
- 239000002250 absorbent Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000003078 antioxidant effect Effects 0.000 claims description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 7
- 239000001569 carbon dioxide Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- SLYCYWCVSGPDFR-UHFFFAOYSA-N octadecyltrimethoxysilane Chemical compound CCCCCCCCCCCCCCCCCC[Si](OC)(OC)OC SLYCYWCVSGPDFR-UHFFFAOYSA-N 0.000 claims description 6
- 150000002978 peroxides Chemical class 0.000 claims description 6
- 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
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 4
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 claims description 3
- 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
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims description 3
- 239000012965 benzophenone Substances 0.000 claims description 3
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 3
- 239000012964 benzotriazole 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
- MUCUNSBITNLEHP-UHFFFAOYSA-N diethoxy-(10-fluorodecyl)-nonadecan-2-yloxysilane Chemical compound C(CCCCCCCCCCCCCCCC)C(C)O[Si](OCC)(OCC)CCCCCCCCCCF MUCUNSBITNLEHP-UHFFFAOYSA-N 0.000 claims description 3
- FRWPIQAMIMYSPM-UHFFFAOYSA-N diethoxy-(8-fluorooctyl)-pentadecan-2-yloxysilane Chemical compound C(CCCCCCCCCCCC)C(C)O[Si](OCC)(OCC)CCCCCCCCF FRWPIQAMIMYSPM-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 compound 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
- 239000002530 phenolic antioxidant 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
- 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
- 238000000034 method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 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 4
- 239000000203 mixture Substances 0.000 description 3
- 239000002352 surface water Substances 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 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 description 2
- 239000006096 absorbing agent Substances 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
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses a super-hydrophobic foaming polypropylene and a preparation method thereof, wherein the super-hydrophobic foaming polypropylene comprises polypropylene, long-chain alkylsilane, nano silicon dioxide and an additive, the long-chain alkylsilane and the polypropylene form a microstructure by winding on the surface of the polypropylene, the nano silicon dioxide is embedded in the microstructure, and the winding rate of the long-chain alkylsilane is 1-30%. According to the super-hydrophobic foamed polypropylene and the preparation method thereof disclosed by the invention, long-chain alkylsilane and polypropylene are wound during melt extrusion to form a surface microstructure of the polypropylene, and nano silicon dioxide is embedded to form a super-hydrophobic nano microstructure on the surface, so that the super-hydrophobic foamed polypropylene has a super-hydrophobic effect, and meanwhile, the melt strength of the polypropylene is improved, so that 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 foaming polypropylene and a preparation method thereof.
Background
Because of the large dielectric constant of water, electromagnetic waves emitted by radars, signal base stations and the like are attenuated by rainwater, which is called a rain fade phenomenon. Particularly, rain films can be formed on the radome and the radome in rainy days, and serious attenuation is caused to signals. In order to reduce the problem of rain fade, the radome can be made to be super-hydrophobic so that a water film cannot be formed.
The radome material is usually a fiber reinforced resin composite material, mainly glass fiber reinforced plastics, but the specific gravity of the glass fiber reinforced plastics is high, and foamed polymer materials are ideal materials for meeting the light weight design of the antenna, because the foamed materials usually have lower density and lower dielectric constant.
At present, no report is found on the super-hydrophobic foamed polypropylene. Therefore, the preparation method of the super-hydrophobic foamed polypropylene is applied to the fields of radomes, 5G radomes and the like, has the function of resisting rain attenuation while meeting the light weight, and fills up the market blank.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provide super-hydrophobic foamed polypropylene and a preparation method thereof.
In order to achieve the above purpose and achieve the above technical effects, the invention adopts the following technical scheme:
The preparation raw materials of the super-hydrophobic foaming polypropylene comprise polypropylene, long-chain alkylsilane, nano silicon dioxide and an additive, wherein the long-chain alkylsilane and the polypropylene form a microstructure by winding on the surface of the polypropylene, the nano silicon dioxide is embedded in the microstructure, and the winding rate of the long-chain alkylsilane is 1-30%.
Further, the super-hydrophobic foamed polypropylene comprises, in weight percent:
80 to 98.5 weight percent of polypropylene, 0.5 to 5 weight percent of long-chain alkylsilane, 0.5 to 5 weight percent of nano silicon dioxide and 0.5 to 10 weight percent of additive.
Further, the super-hydrophobic foamed polypropylene has a density of 0.01-0.15g/cm 3, a cell size of 5-100 μm, a cell density of >10 9 cells/m 3 and a dielectric constant of <1.8.
Further, the long-chain alkyl silane is one or more of methyl dodecyl dimethoxy silane, dodecyl methyl dichloro silane, dodecyl trichloro silane, hexadecyl trimethoxy silane, octadecyl trimethoxy silane, dodecyl trimethoxy silane, tridecyl fluorooctyl triethoxy silane, heptadecyl fluorodecyl triethoxy silane and 4-methyl-tridecyl fluorodecyl triethoxy silane.
Further, the particle size of the nano silicon dioxide is 5-100nm, and the specific surface area is 150-300m 2/g.
Further, the additive is one or a combination of more of peroxide, initiator, foaming agent, nucleating agent, antioxidant and ultraviolet absorber.
Further, the peroxide is selected from one or a combination of a plurality 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 may be employed, and when the foaming agent is a chemical foaming agent, a chemical extrusion foaming process may be employed.
Further, the antioxidant is one or a combination of more selected from phenolic antioxidants, phosphite antioxidants and thioester antioxidants, and the ultraviolet absorber is one or a combination of more selected from benzotriazole, benzophenone and triazine ultraviolet absorbers.
The invention discloses a preparation method of super-hydrophobic foaming polypropylene, which comprises the following steps:
When the foaming agent is a physical foaming agent, adding polypropylene, long-chain alkylsilane, nano silicon dioxide and an additive into an autoclave, filling the physical foaming agent, heating to 200-230 ℃ until the materials are melted, continuing for 5-60 seconds, opening a pressure release valve to release pressure rapidly, and then adding cold water at 10-40 ℃ for cooling and shaping to obtain the foamed polypropylene;
When the foaming agent is a chemical foaming agent, polypropylene, long-chain alkylsilane, nano silicon dioxide and additives are added into an extruder, and heated, melted and extruded at the temperature of 200-230 ℃ and the pressure of 10-20Mpa, so that the foaming polypropylene can be obtained.
Compared with the prior art, the invention has the beneficial effects that:
1. The long-chain alkylsilane and the polypropylene are wound during melt extrusion, the polypropylene can form a surface microstructure after winding, and the nano silicon dioxide is embedded to enable the surface to form a super-hydrophobic nano microstructure, so that the super-hydrophobic effect is achieved;
2. The winding of long-chain alkylsilane improves the melt strength of polypropylene and is more suitable for the production of foaming polypropylene.
Detailed Description
The present invention will be further described in detail with reference to the following 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 and 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 for purposes of illustration only and are not intended to limit the scope of the invention.
In one aspect, the invention discloses a super-hydrophobic foamed polypropylene, which is prepared from the following raw materials: 80-98.5wt% of polypropylene, 0.5-5wt% of reactive long-chain alkylsilane, 0.5-5wt% of nano silicon dioxide and 0.5-10wt% of additive, wherein the winding rate of the long-chain alkylsilane is 1-30%. The density of the super-hydrophobic foamed polypropylene obtained by the invention is 0.01-0.15G/cm 3, the cell size is 5-100 mu m, the cell density is more than 10 9/m 3, the dielectric constant is less than 1.8, the density of the polypropylene is reduced by foaming, the dielectric strength is reduced, and the foamed material with low dielectric strength is more suitable for 5G and radar antennas.
According to the preparation method, long-chain alkylsilane and nano silicon dioxide are added into the preparation raw materials, winding of the long-chain alkylsilane and embedding of the nano silicon dioxide are completed by means of melt extrusion, a microstructure is formed on the surface of polypropylene, and the nano silicon dioxide is embedded into the microstructure to construct a nano microstructure of super Shu Shui, so that the polypropylene 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 long-chain alkyl silane is one or more of methyl dodecyl dimethoxy silane, dodecyl methyl dichloro silane, dodecyl trichloro silane, hexadecyl trimethoxy silane, octadecyl trimethoxy silane, dodecyl trimethoxy silane, tridecyl fluorooctyl triethoxy silane, heptadecyl fluorodecyl triethoxy silane and 4-methyl-tridecyl fluorodecyl triethoxy silane.
The particle size of the nano silicon dioxide is 5-100nm, the specific surface area is 150-300m 2/g, preferably, the particle size of the nano silicon dioxide is 15-45nm, and the specific surface area is 200-300m 2/g.
The additive is one or a combination of more of peroxide, initiator, foaming agent, nucleating agent, antioxidant and ultraviolet absorber. 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 may be employed, and when the foaming agent is a chemical foaming agent, a chemical extrusion foaming process may be employed.
The antioxidant is one or a combination of more selected from phenolic antioxidants, phosphite antioxidants and thioester antioxidants, and the ultraviolet absorbent is one or a combination of more selected from benzotriazole, benzophenone and triazine ultraviolet absorbent.
The invention discloses a preparation method of super-hydrophobic foaming polypropylene, which comprises the following steps:
When the foaming agent is a physical foaming agent, adding polypropylene, long-chain alkylsilane, nano silicon dioxide and an additive into an autoclave, filling the physical foaming agent, heating to 200-230 ℃ until the materials are melted, continuing for 5-60 seconds, opening a pressure release valve to release pressure rapidly, and then adding cold water at 10-40 ℃ for cooling and shaping to obtain the foamed polypropylene;
When the foaming agent is a chemical foaming agent, polypropylene, long-chain alkylsilane, nano silicon dioxide and additives are added into an extruder, and heated, melted and extruded at the temperature of 200-230 ℃ and the pressure of 10-20Mpa, so that the foaming polypropylene can be obtained.
Examples
95.9Kg of polypropylene, 2kg of octadecyltrimethoxy silane, 2kg of nano silicon dioxide (with the particle size of 100nm and the specific surface area of 150m 2/g), 0.5kg of antioxidant 1076 and 0.5kg of ultraviolet absorbent UV531 are added into an autoclave, carbon dioxide is filled, the heating temperature is up to 230 ℃, the pressure is continuously maintained for 20 seconds, a pressure release valve is opened for rapid pressure release, and then the mixture is put into cold water with the temperature of 30 ℃ for cooling and shaping, so that the foaming polypropylene can be obtained.
Examples
95.9Kg of polypropylene, 2kg of heptadecafluorodecyl triethoxysilane, 2kg of nano silicon dioxide (with the particle size of 30nm and the specific surface area of 300m 2/g), 0.5kg of antioxidant 1076 and 0.5kg of ultraviolet absorbent UV531 are added into an autoclave, carbon dioxide is filled, the heating temperature is up to 230 ℃, the pressure is continuously maintained for 20 seconds, a pressure release valve is opened for rapid pressure release, and then the foamed polypropylene is put into 30 ℃ cold water for cooling and shaping, so that the foamed polypropylene can be obtained.
Example 1 was followed.
Examples
95.25Kg of polypropylene, 2.5kg of heptadecafluorodecyl triethoxysilane, 2kg of nano silicon dioxide (particle size of 30nm, specific surface area of 300m 2/g), 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, heated, melted and extruded at the temperature of 230 ℃ and the pressure of 12MPa, and the foaming polypropylene can be obtained.
Example 1 was followed.
Examples
80Kg of polypropylene, 0.5kg of octadecyltrimethoxysilane, 2kg of nano silicon dioxide (with the particle size of 100nm and the specific surface area of 150m 2/g), 4kg of antioxidant 1076 and 4kg of ultraviolet absorbent UV531 are added into an autoclave, carbon dioxide is filled, the heating temperature is up to 230 ℃, the pressure is continuously reduced for 20 seconds, a pressure reducing valve is opened for rapid pressure reduction, and then the mixture is put into cold water with the temperature of 30 ℃ for cooling and shaping, so that the foaming polypropylene can be obtained.
Example 1 was followed.
Examples
80Kg of polypropylene, 5kg of octadecyltrimethoxy silane, 4kg of nano silicon dioxide (with the particle size of 100nm and the specific surface area of 150m 2/g), 4kg of antioxidant 1076 and 4kg of ultraviolet absorbent UV531 are added into an autoclave, carbon dioxide is filled, the heating temperature is up to 230 ℃, the pressure is continuously carried out for 20 seconds, a pressure release valve is opened for rapid pressure release, and then the mixture is put into cold water with the temperature of 30 ℃ for cooling and shaping, thus obtaining the foaming polypropylene.
Example 1 was followed.
Comparative example 1
Commercially available polypropylene sheets were the same thickness as the expanded polypropylene in 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.
The dielectric constant is tested by a dielectric constant tester, and is tested by referring to GB/T1409-2006; surface water contact angle, test with contact angle tester, test with reference to GB/T30693-2014; density, tested with reference to GB/T6343-2009; cell size and cell density were observed and calculated using a scanning electron microscope. The results are shown in Table 1.
TABLE 1
| Dielectric constant | Surface water contact angle ° | Density (g/cm 3) | Cell size (μm) | Cell density (number/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 |
As can be seen from the data, the density of the foamed polypropylene in the examples 1-3 is reduced by one order of magnitude compared with that of the comparative example 1, the dielectric constant is obviously reduced, the surface hydrophobic angle exceeds 150 degrees, the requirements of the radar antenna field are met, the density is low, the dielectric is low, the density is low, and the super-hydrophobic effect can be achieved.
The parts not specifically described are only needed to be obtained by adopting the prior art, and can be directly purchased in the market, and are not described in detail herein.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (1)
1. The preparation method of the super-hydrophobic foamed polypropylene is characterized by comprising the following raw materials in percentage by weight:
80-98.5wt% of polypropylene, 0.5-5wt% of long-chain alkylsilane, 0.5-5wt% of nano silicon dioxide and 0.5-10wt% of additive;
the long-chain alkylsilane and polypropylene form a microstructure by winding on the surface of the polypropylene, the nano silicon dioxide is embedded in the microstructure, and the winding rate of the long-chain alkylsilane is 1-30%;
The density of the super-hydrophobic foamed polypropylene is 0.01-0.15g/cm 3, the cell size is 5-100 mu m, the cell density is more than 10 9/m 3, and the dielectric constant is less than 1.8;
the long-chain alkyl silane is one or more of methyl dodecyl dimethoxy silane, dodecyl methyl dichloro silane, dodecyl trichloro silane, hexadecyl trimethoxy silane, octadecyl trimethoxy silane, dodecyl trimethoxy silane, tridecyl fluorooctyl triethoxy silane, heptadecyl fluorodecyl triethoxy silane and 4-methyl-tridecyl fluorodecyl triethoxy silane;
The particle size of the nano silicon dioxide is 5-100nm, and the specific surface area is 150-300m 2/g;
The additive is one or a combination of more of peroxide, an initiator, a foaming agent, a nucleating agent, an antioxidant and an ultraviolet absorber;
The peroxide is selected from one or a combination of a plurality 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;
The antioxidant is one or a combination of more selected from phenolic antioxidants, phosphite antioxidants and thioester antioxidants, and the ultraviolet absorbent is one or a combination of more selected from benzotriazole, benzophenone and triazine ultraviolet absorbent;
the preparation method comprises the following steps:
When the foaming agent is a physical foaming agent, adding polypropylene, long-chain alkylsilane, nano silicon dioxide and an additive into an autoclave, filling the physical foaming agent, heating to 200-230 ℃ until the materials are melted, continuing for 5-60 seconds, opening a pressure release valve to release pressure rapidly, and then adding cold water at 10-40 ℃ for cooling and shaping to obtain the foamed polypropylene;
When the foaming agent is a chemical foaming agent, polypropylene, long-chain alkylsilane, nano silicon dioxide and additives are added into an extruder, and heated, melted and extruded at the temperature of 200-230 ℃ and the pressure of 10-20Mpa, so that the foaming polypropylene can be obtained.
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