CN112111100A - Composite plastic for power supply bracket and preparation method thereof - Google Patents
Composite plastic for power supply bracket and preparation method thereof Download PDFInfo
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- CN112111100A CN112111100A CN202010883688.8A CN202010883688A CN112111100A CN 112111100 A CN112111100 A CN 112111100A CN 202010883688 A CN202010883688 A CN 202010883688A CN 112111100 A CN112111100 A CN 112111100A
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- supply bracket
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- 239000004033 plastic Substances 0.000 title claims abstract description 46
- 229920003023 plastic Polymers 0.000 title claims abstract description 46
- 239000002131 composite material Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000010439 graphite Substances 0.000 claims abstract description 53
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 53
- -1 graphite compound Chemical class 0.000 claims abstract description 45
- 238000003756 stirring Methods 0.000 claims abstract description 45
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 35
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 28
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000919 ceramic Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 24
- 239000004743 Polypropylene Substances 0.000 claims abstract description 20
- 229920001155 polypropylene Polymers 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 239000010703 silicon Substances 0.000 claims abstract description 18
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000314 lubricant Substances 0.000 claims abstract description 14
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 claims abstract description 14
- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 14
- 239000012745 toughening agent Substances 0.000 claims abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910021485 fumed silica Inorganic materials 0.000 claims abstract description 13
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 12
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims abstract description 12
- 239000007822 coupling agent Substances 0.000 claims abstract description 12
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims abstract description 12
- 239000010456 wollastonite Substances 0.000 claims abstract description 12
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 12
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 10
- 230000007935 neutral effect Effects 0.000 claims abstract description 8
- 238000010992 reflux Methods 0.000 claims abstract description 8
- 238000001694 spray drying Methods 0.000 claims abstract description 8
- 238000000967 suction filtration Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims abstract description 3
- 230000008018 melting Effects 0.000 claims abstract description 3
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000004709 Chlorinated polyethylene Substances 0.000 claims description 2
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 2
- 239000004200 microcrystalline wax Substances 0.000 claims description 2
- 235000019808 microcrystalline wax Nutrition 0.000 claims description 2
- 239000004209 oxidized polyethylene wax Substances 0.000 claims description 2
- 235000013873 oxidized polyethylene wax Nutrition 0.000 claims description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 2
- 239000001993 wax Substances 0.000 claims description 2
- 239000013078 crystal Substances 0.000 description 8
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a preparation method of composite plastic for a power supply bracket, which comprises the following steps: mixing expanded graphite and ethanol water solution, ultrasonically dispersing at 35-45kHz for 20-30min, stirring at 80-90 ℃ for 1-2h under a reflux state, and cooling to 40-50 ℃ to obtain pretreated expanded graphite; stirring the pretreated expanded graphite, slowly dropwise adding ethyl orthosilicate under a stirring state, continuously stirring after completely dropwise adding, cooling to room temperature, performing suction filtration, washing until the solution is neutral, dispersing the solution in an ethanol aqueous solution, and performing spray drying to obtain a silicon dioxide-expanded graphite compound; the composite plastic for the power supply bracket is prepared by uniformly mixing polypropylene, styrene thermoplastic elastomer, silicon dioxide-expanded graphite compound, fumed silica, wollastonite powder, ceramic fiber, talcum powder, maleic anhydride grafted polypropylene, far infrared ceramic powder, lignocellulose, coupling agent, toughening agent, lubricant and antioxidant, melting and extruding, cooling, granulating by a granulator, and drying.
Description
Technical Field
The invention relates to the technical field of power supply supports, in particular to composite plastic for a power supply support and a preparation method thereof.
Background
A power supply is a device that supplies power to an electronic device, also called a power supply, and supplies electrical energy required by all components in the electrical device. Whether the current and the voltage are stable or not and the power of the power supply directly influence the working performance and the service life of the electrical equipment. The power supply product is widely applied to the fields of industrial automatic control, military equipment, scientific research equipment, industrial control equipment, computers, communication equipment, power equipment, instruments and meters, medical equipment, semiconductor refrigeration and heating and the like.
In order to achieve the purpose of firmness and avoid the falling of the power supply in the transportation or vibration environment, the prior art often adopts a power supply bracket to fix the power supply. The current power support has the technical problems of poor toughness and poor thermal stability in the use process, the support is easy to break to cause the power to be fixed infirm, damage is caused to internal parts of storage, the product quality is influenced, the cost is increased, and unnecessary waste is caused.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides composite plastic for a power supply bracket and a preparation method thereof.
A preparation method of composite plastic for a power supply bracket comprises the following steps:
s1, mixing the expanded graphite and an ethanol aqueous solution, performing ultrasonic dispersion for 20-30min at the ultrasonic power of 35-45kHz, stirring for 1-2h at the reflux state of 80-90 ℃, reducing the temperature to 40-50 ℃, and adjusting the pH value of the system to 7.4-8 to obtain pretreated expanded graphite;
s2, stirring the pretreated expanded graphite, slowly dropwise adding ethyl orthosilicate under the stirring state, continuously stirring after completely dropwise adding, cooling to room temperature, performing suction filtration, washing to be neutral, dispersing in an ethanol water solution, and performing spray drying to obtain a silicon dioxide-expanded graphite compound;
s3, mixing polypropylene, styrene thermoplastic elastomer, silicon dioxide-expanded graphite compound, fumed silica, wollastonite powder, ceramic fiber, talcum powder, maleic anhydride grafted polypropylene, far infrared ceramic powder, lignocellulose, coupling agent, toughening agent, lubricant and antioxidant uniformly, melting and extruding, cooling, granulating by a granulator, and drying to obtain the composite plastic for the power supply bracket.
Preferably, in S1, the mass ratio of the expanded graphite to the ethanol aqueous solution is 20-25: 100-140, the mass fraction of the ethanol water solution is 30-40%.
Preferably, in S2, the mass ratio of the pretreated expanded graphite to the tetraethoxysilane is 120-150: 5-8.
Preferably, in S2, the mass fraction of the ethanol water solution is 40-50%.
Preferably, in S3, the mass ratio of the polypropylene, the styrene-based thermoplastic elastomer, the silica-expanded graphite composite, the fumed silica, the wollastonite powder, the ceramic fiber, the talc powder, the maleic anhydride grafted polypropylene, the far infrared ceramic powder, the lignocellulose, the coupling agent, the toughening agent, the lubricant and the antioxidant is 100: 15-25: 1-2: 15-35: 4-8: 2-6: 2-8: 1-5: 2-4: 1-2: 0.5-1.2: 1-2: 1-2: 1-3.
Preferably, in S3, the melt extrusion is performed by using a twin-screw extruder, and the temperatures of the sections of the barrel of the twin-screw extruder are as follows: the first zone temperature is 182-.
Preferably, in S3, the polypropylene is an alpha-crystalline polypropylene.
Preferably, in S3, the toughening agent is at least one of ethylene-vinyl acetate copolymer, chlorinated polyethylene, acrylonitrile-butadiene-styrene copolymer, and ethylene propylene diene monomer.
Preferably, in S3, the lubricant is at least one of polyethylene wax, oxidized polyethylene wax, and microcrystalline wax.
The composite plastic for the power supply bracket is prepared by adopting the preparation method of the composite plastic for the power supply bracket.
The technical effects of the invention are as follows:
the preparation method is simple, easy to operate and low in cost. In S1 and S2, active hydroxyl groups on the silica sol and the surface of the expanded graphite generate hydrogen bond action and modify the expanded graphite, wherein a silicon-oxygen bond and a silicon-carbon bond form a heat insulation protective layer on the surface of the expanded graphite, the silica-expanded graphite compound can effectively inhibit thermal decomposition of a polymer matrix material, and a carbon layer formed at a high temperature promotes the formation of a more compact structure and has higher strength.
The alpha crystal form polypropylene is of a spherulitic structure, the silicon dioxide-expanded graphite compound can also be used as a nucleating agent of the alpha crystal form polypropylene, and the compatibility of the polypropylene and a styrene thermoplastic elastomer can be effectively improved by matching with maleic anhydride grafted polypropylene, so that the composite plastic not only has very strong toughness and excellent bearing capacity, but also has excellent hot air aging resistance, effectively prolongs the service life, and can be effectively applied to a power supply bracket.
According to the invention, by compounding the silicon dioxide-expanded graphite compound with the polypropylene and styrene thermoplastic elastomer, the problem of reduced toughness and thermal stability caused by addition of a large amount of fumed silica can be effectively avoided; and meanwhile, maleic anhydride grafted polypropylene is added, so that the processing fluidity and the thermal stability of the composite plastic are further improved.
Compared with the prior art, the material obtained by the invention has excellent mechanical properties, particularly has the advantages of irreplaceable toughness and thermal stability, meets the mechanical requirements of the power supply bracket, is simple in processing technology, improves the adaptability of the power supply bracket in a high-temperature environment, enables the power supply bracket to be fixed more firmly, greatly improves the integral installation strength, is safer and more reliable to use, has longer service life, and ensures that the power supply cannot crack, move, slide, fall off and the like.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A preparation method of composite plastic for a power supply bracket comprises the following steps:
s1, mixing 20kg of expanded graphite with 140kg of ethanol aqueous solution with the mass fraction of 30%, ultrasonically dispersing for 30min at the ultrasonic power of 35kHz, stirring for 1h at the reflux state of 90 ℃, reducing the stirring speed to 500r/min, and reducing the stirring speed to 40 ℃, and adjusting the pH value of the system to 7.4-8 by using ammonia water to obtain pretreated expanded graphite;
s2, stirring 150kg of pretreated expanded graphite, slowly dropwise adding 5kg of ethyl orthosilicate under the stirring state, stirring at 1500r/min, continuously stirring for 2h after dropwise adding is completed, cooling to room temperature, performing suction filtration, washing with an ethanol aqueous solution until the solution is neutral, dispersing in an ethanol aqueous solution with the mass fraction of 50%, and performing spray drying to obtain a silicon dioxide-expanded graphite compound;
s3, uniformly mixing 100kg of alpha-crystal polypropylene, 15kg of styrene thermoplastic elastomer, 2kg of silicon dioxide-expanded graphite compound, 15kg of fumed silica, 8kg of wollastonite powder, 2kg of ceramic fiber, 8kg of talcum powder, 1kg of maleic anhydride grafted polypropylene, 4kg of far infrared ceramic powder, 1kg of lignocellulose, 1.2kg of coupling agent, 1kg of toughening agent, 2kg of lubricating agent and 1kg of antioxidant, and performing melt extrusion by using a double-screw extruder, wherein the temperatures of all sections of a charging barrel of the double-screw extruder are as follows in sequence: the temperature of the first zone is 195 ℃, the temperature of the second zone is 210 ℃, the temperature of the third zone is 198 ℃, the temperature of the fourth zone is 200 ℃, the temperature of the fifth zone is 224 ℃, the temperature of the sixth zone is 200 ℃ and the temperature of the machine head is 210 ℃; and granulating by a granulator after cooling, and drying to obtain the composite plastic for the power supply bracket.
Example 2
A preparation method of composite plastic for a power supply bracket comprises the following steps:
s1, mixing 25kg of expanded graphite with 100kg of 40% ethanol aqueous solution by mass, ultrasonically dispersing for 20min at the ultrasonic power of 45kHz, stirring for 2h under the reflux state at the temperature of 80 ℃, reducing the stirring speed to 400r/min, and adjusting the pH value of the system to 7.4-8 by using ammonia water to obtain pretreated expanded graphite;
s2, stirring 120kg of pretreated expanded graphite, slowly dropwise adding 8kg of ethyl orthosilicate under the stirring state, stirring at the speed of 1200r/min, continuously stirring for 4h after dropwise adding is completed, cooling to room temperature, washing to be neutral by using an ethanol water solution after suction filtration, dispersing in an ethanol water solution with the mass fraction of 40%, and spray drying to obtain a silicon dioxide-expanded graphite compound;
s3, uniformly mixing 100kg of alpha-crystal polypropylene, 25kg of styrene thermoplastic elastomer, 1kg of silicon dioxide-expanded graphite compound, 35kg of fumed silica, 4kg of wollastonite powder, 6kg of ceramic fiber, 2kg of talcum powder, 5kg of maleic anhydride grafted polypropylene, 2kg of far infrared ceramic powder, 2kg of lignocellulose, 0.5kg of coupling agent, 2kg of toughening agent, 1kg of lubricating agent and 3kg of antioxidant, and performing melt extrusion by using a double-screw extruder, wherein the temperatures of all sections of a charging barrel of the double-screw extruder are as follows in sequence: the first zone temperature is 182 ℃, the second zone temperature is 220 ℃, the third zone temperature is 190 ℃, the fourth zone temperature is 210 ℃, the fifth zone temperature is 215 ℃, the sixth zone temperature is 210 ℃ and the head temperature is 190 ℃; and granulating by a granulator after cooling, and drying to obtain the composite plastic for the power supply bracket.
Example 3
A preparation method of composite plastic for a power supply bracket comprises the following steps:
s1, mixing 22kg of expanded graphite with 130kg of 33% ethanol aqueous solution by mass fraction, ultrasonically dispersing for 28min at the ultrasonic power of 38kHz, stirring for 1.3h at the reflux state at the temperature of 87 ℃, reducing the stirring speed to 480r/min, and adjusting the pH value of the system to 7.4-8 by using ammonia water to obtain pretreated expanded graphite;
s2, stirring 140kg of pretreated expanded graphite, slowly dropwise adding 6kg of ethyl orthosilicate under the stirring state, stirring at the speed of 1400r/min, continuously stirring for 2.5h after dropwise adding is completed, cooling to room temperature, washing to be neutral by using an ethanol water solution after suction filtration, dispersing in an ethanol water solution with the mass fraction of 47%, and spray drying to obtain a silicon dioxide-expanded graphite compound;
s3, uniformly mixing 100kg of alpha-crystal polypropylene, 18kg of styrene thermoplastic elastomer, 1.7kg of silicon dioxide-expanded graphite compound, 20kg of fumed silica, 7kg of wollastonite powder, 3kg of ceramic fiber, 6kg of talcum powder, 2kg of maleic anhydride grafted polypropylene, 3.5kg of far infrared ceramic powder, 1.2kg of lignocellulose, 1kg of coupling agent, 1.3kg of toughening agent, 1.7kg of lubricant and 1.5kg of antioxidant, and performing melt extrusion by using a double-screw extruder, wherein the temperatures of all sections of a charging barrel of the double-screw extruder are sequentially: the temperature of a first area is 190 ℃, the temperature of a second area is 212 ℃, the temperature of a third area is 196 ℃, the temperature of a fourth area is 203 ℃, the temperature of a fifth area is 222 ℃, the temperature of a sixth area is 203 ℃ and the temperature of a machine head is 205 ℃; and granulating by a granulator after cooling, and drying to obtain the composite plastic for the power supply bracket.
Example 4
A preparation method of composite plastic for a power supply bracket comprises the following steps:
s1, mixing 24kg of expanded graphite with 110kg of aqueous ethanol solution with the mass fraction of 37%, ultrasonically dispersing for 22min at the ultrasonic power of 42kHz, stirring for 1.7h under the reflux state at the temperature of 83 ℃, reducing the stirring speed to 420r/min, reducing the stirring speed to 47 ℃, and adjusting the pH value of the system to 7.4-8 by using ammonia water to obtain pretreated expanded graphite;
s2, stirring 130kg of pretreated expanded graphite, slowly dropwise adding 7kg of ethyl orthosilicate under the stirring state, stirring at 1300r/min, continuously stirring for 3.5h after dropwise adding is completed, cooling to room temperature, washing to be neutral by using an ethanol water solution after suction filtration, dispersing in an ethanol water solution with the mass fraction of 43%, and spray drying to obtain a silicon dioxide-expanded graphite compound;
s3, uniformly mixing 100kg of alpha-crystal polypropylene, 22kg of styrene thermoplastic elastomer, 1.3kg of silicon dioxide-expanded graphite compound, 30kg of fumed silica, 5kg of wollastonite powder, 5kg of ceramic fiber, 4kg of talcum powder, 4kg of maleic anhydride grafted polypropylene, 2.5kg of far infrared ceramic powder, 1.8kg of lignocellulose, 0.8kg of coupling agent, 1.7kg of toughening agent, 1.3kg of lubricant and 2.5kg of antioxidant, and performing melt extrusion by using a double-screw extruder, wherein the temperatures of all sections of a charging barrel of the double-screw extruder are sequentially: the first zone temperature is 186 ℃, the second zone temperature is 218 ℃, the third zone temperature is 192 ℃, the fourth zone temperature is 207 ℃, the fifth zone temperature is 218 ℃, the sixth zone temperature is 207 ℃ and the head temperature is 195 ℃; and granulating by a granulator after cooling, and drying to obtain the composite plastic for the power supply bracket.
Example 5
A preparation method of composite plastic for a power supply bracket comprises the following steps:
s1, mixing 23kg of expanded graphite and 120kg of 35% ethanol aqueous solution by mass fraction, ultrasonically dispersing for 25min at the ultrasonic power of 40kHz, stirring for 1.5h under the reflux state at the temperature of 85 ℃, reducing the stirring speed to 450r/min, reducing the stirring speed to 45 ℃, and adjusting the pH value of the system to 7.4-8 by using ammonia water to obtain pretreated expanded graphite;
s2, stirring 135kg of pretreated expanded graphite, slowly dropwise adding 6.5kg of ethyl orthosilicate under the stirring state, stirring at 1350r/min, continuously stirring for 3h after dropwise adding is completed, cooling to room temperature, washing to be neutral by using an ethanol water solution after suction filtration, dispersing in an ethanol water solution with the mass fraction of 45%, and spray drying to obtain a silicon dioxide-expanded graphite compound;
s3, uniformly mixing 100kg of alpha-crystal polypropylene, 20kg of styrene thermoplastic elastomer, 1.5kg of silicon dioxide-expanded graphite compound, 25kg of fumed silica, 6kg of wollastonite powder, 4kg of ceramic fiber, 5kg of talcum powder, 3kg of maleic anhydride grafted polypropylene, 3kg of far infrared ceramic powder, 1.5kg of lignocellulose, 0.9kg of coupling agent, 1.5kg of toughening agent, 1.5kg of lubricant and 2kg of antioxidant, and performing melt extrusion by using a double-screw extruder, wherein the temperatures of all sections of a charging barrel of the double-screw extruder are sequentially: the temperature of the first zone is 188 ℃, the temperature of the second zone is 215 ℃, the temperature of the third zone is 194 ℃, the temperature of the fourth zone is 205 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 205 ℃ and the temperature of the machine head is 200 ℃; and granulating by a granulator after cooling, and drying to obtain the composite plastic for the power supply bracket.
Comparative example 1
A preparation method of composite plastic for a power supply bracket comprises the following steps: uniformly mixing 100kg of alpha-crystal polypropylene, 20kg of styrene thermoplastic elastomer, 25kg of fumed silica, 6kg of wollastonite powder, 4kg of ceramic fiber, 5kg of talcum powder, 3kg of maleic anhydride grafted polypropylene, 3kg of far infrared ceramic powder, 1.5kg of lignocellulose, 0.9kg of coupling agent, 1.5kg of toughening agent, 1.5kg of lubricating agent and 2kg of antioxidant, and carrying out melt extrusion by adopting a double-screw extruder, wherein the temperatures of all sections of a charging barrel of the double-screw extruder are as follows in sequence: the temperature of the first zone is 188 ℃, the temperature of the second zone is 215 ℃, the temperature of the third zone is 194 ℃, the temperature of the fourth zone is 205 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 205 ℃ and the temperature of the machine head is 200 ℃; and granulating by a granulator after cooling, and drying to obtain the composite plastic for the power supply bracket.
Comparative example 2
A preparation method of composite plastic for a power supply bracket comprises the following steps: uniformly mixing 100kg of alpha-crystalline polypropylene, 20kg of styrene thermoplastic elastomer, 1.5kg of expanded graphite particles, 25kg of fumed silica, 6kg of wollastonite powder, 4kg of ceramic fiber, 5kg of talcum powder, 3kg of maleic anhydride grafted polypropylene, 3kg of far infrared ceramic powder, 1.5kg of lignocellulose, 0.9kg of coupling agent, 1.5kg of toughening agent, 1.5kg of lubricating agent and 2kg of antioxidant, and performing melt extrusion by using a double-screw extruder, wherein the temperatures of all sections of a charging barrel of the double-screw extruder are as follows in sequence: the temperature of the first zone is 188 ℃, the temperature of the second zone is 215 ℃, the temperature of the third zone is 194 ℃, the temperature of the fourth zone is 205 ℃, the temperature of the fifth zone is 220 ℃, the temperature of the sixth zone is 205 ℃ and the temperature of the machine head is 200 ℃; and granulating by a granulator after cooling, and drying to obtain the composite plastic for the power supply bracket.
The composite plastics for power supply brackets obtained in example 5 and comparative examples 1-2 were subjected to mechanical property tests as follows:
i testing the gloss with a gloss meter from a glossy surface 60 DEG incident angle according to the test method for specular gloss of plastics GB/T8807 and 1988;
ii, testing the impact strength according to the determination of the impact performance of the GB/T1043.1-2008 plastic simple supported beam;
iii testing the tensile strength and elongation at break according to the determination of tensile properties of GB/T1040.1-2018 plastics;
iv testing the bending strength and the bending modulus according to the determination of the bending performance of the plastic of GB/T9341-2008.
The results are as follows:
from the above table, it can be seen that: the composite plastic for the power supply bracket obtained in the embodiment 5 is superior to a comparative example in mechanical property, and the vicat softening point and the melt flow rate are also higher than those of the comparative example, and it is confirmed that the composite plastic for the power supply bracket has excellent mechanical property, especially toughness and thermal stability, and has irreplaceable advantages, so that the mechanical requirement of the power supply bracket in use is met, the processing technology is simple, the adaptability of the power supply bracket in a high-temperature environment is improved, the power supply bracket is more firmly fixed, the integral installation strength is greatly improved, the composite plastic is safer and more reliable in use, the service life is longer, and the phenomena of fracture, movement, sliding, falling and the like of the power supply are avoided.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A preparation method of composite plastic for a power supply bracket is characterized by comprising the following steps:
s1, mixing the expanded graphite and an ethanol aqueous solution, performing ultrasonic dispersion for 20-30min at the ultrasonic power of 35-45kHz, stirring for 1-2h at the reflux state of 80-90 ℃, reducing the temperature to 40-50 ℃, and adjusting the pH value of the system to 7.4-8 to obtain pretreated expanded graphite;
s2, stirring the pretreated expanded graphite, slowly dropwise adding ethyl orthosilicate under the stirring state, continuously stirring after completely dropwise adding, cooling to room temperature, performing suction filtration, washing to be neutral, dispersing in an ethanol water solution, and performing spray drying to obtain a silicon dioxide-expanded graphite compound;
s3, mixing polypropylene, styrene thermoplastic elastomer, silicon dioxide-expanded graphite compound, fumed silica, wollastonite powder, ceramic fiber, talcum powder, maleic anhydride grafted polypropylene, far infrared ceramic powder, lignocellulose, coupling agent, toughening agent, lubricant and antioxidant uniformly, melting and extruding, cooling, granulating by a granulator, and drying to obtain the composite plastic for the power supply bracket.
2. The preparation method of the composite plastic for the power supply bracket according to claim 1, wherein in S1, the mass ratio of the expanded graphite to the ethanol aqueous solution is 20-25: 100-140, the mass fraction of the ethanol water solution is 30-40%.
3. The method for preparing composite plastic for power supply brackets as claimed in claim 1, wherein in S2, the mass ratio of the pretreated expanded graphite to the tetraethoxysilane is 120-150: 5-8.
4. The method for preparing composite plastic for a power supply bracket according to claim 1, wherein in S2, the mass fraction of the ethanol aqueous solution is 40-50%.
5. The method for preparing the composite plastic for the power supply bracket according to claim 1, wherein in S3, the mass ratio of polypropylene, styrene thermoplastic elastomer, silica-expanded graphite composite, fumed silica, wollastonite powder, ceramic fiber, talcum powder, maleic anhydride grafted polypropylene, far infrared ceramic powder, lignocellulose, coupling agent, toughening agent, lubricant and antioxidant is 100: 15-25: 1-2: 15-35: 4-8: 2-6: 2-8: 1-5: 2-4: 1-2: 0.5-1.2: 1-2: 1-2: 1-3.
6. The method for preparing the composite plastic for the power supply bracket according to claim 1, wherein in the step S3, a twin-screw extruder is adopted for melt extrusion, and the temperatures of all sections of a charging barrel of the twin-screw extruder are as follows in sequence: the first zone temperature is 182-.
7. The method for preparing composite plastic for a power supply bracket according to claim 1, wherein in S3, the polypropylene is alpha-crystalline polypropylene.
8. The method for preparing the composite plastic for the power bracket according to claim 1, wherein in S3, the toughening agent is at least one of ethylene-vinyl acetate copolymer, chlorinated polyethylene, acrylonitrile-butadiene-styrene copolymer and ethylene propylene diene monomer.
9. The method of preparing a composite plastic for a power bracket according to claim 1, wherein the lubricant is at least one of polyethylene wax, oxidized polyethylene wax, and microcrystalline wax in S3.
10. A composite plastic for a power supply bracket, which is prepared by the method for preparing the composite plastic for a power supply bracket according to any one of claims 1 to 9.
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| CN113789081A (en) * | 2021-11-03 | 2021-12-14 | 理光感热技术（无锡）有限公司 | Washable ink |
| CN114524961A (en) * | 2021-12-30 | 2022-05-24 | 巨鑫(江苏)新材料包装有限公司 | Microwave-refrigeratable functional SiO2Coating PP composite membrane material and preparation process thereof |
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Application publication date: 20201222 |