CN117924857A - Polytetrafluoroethylene-based low-thermal-resistance heat dissipation material and preparation method thereof - Google Patents
Polytetrafluoroethylene-based low-thermal-resistance heat dissipation material and preparation method thereof Download PDFInfo
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- CN117924857A CN117924857A CN202410067326.XA CN202410067326A CN117924857A CN 117924857 A CN117924857 A CN 117924857A CN 202410067326 A CN202410067326 A CN 202410067326A CN 117924857 A CN117924857 A CN 117924857A
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- 239000000463 material Substances 0.000 title claims abstract description 174
- -1 Polytetrafluoroethylene Polymers 0.000 title claims abstract description 106
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 106
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 106
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 43
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 35
- 239000004917 carbon fiber Substances 0.000 claims abstract description 35
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 35
- 239000003381 stabilizer Substances 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims abstract description 28
- 239000000945 filler Substances 0.000 claims abstract description 28
- 239000004088 foaming agent Substances 0.000 claims abstract description 28
- 150000004767 nitrides Chemical class 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims abstract description 20
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 20
- 239000003999 initiator Substances 0.000 claims abstract description 20
- 238000001125 extrusion Methods 0.000 claims abstract description 19
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 14
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims abstract description 12
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical group C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims abstract description 9
- 235000019400 benzoyl peroxide Nutrition 0.000 claims abstract description 9
- 239000003208 petroleum Substances 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- FAMRKDQNMBBFBR-BQYQJAHWSA-N diethyl azodicarboxylate Substances CCOC(=O)\N=N\C(=O)OCC FAMRKDQNMBBFBR-BQYQJAHWSA-N 0.000 claims abstract description 5
- FAMRKDQNMBBFBR-UHFFFAOYSA-N ethyl n-ethoxycarbonyliminocarbamate Chemical compound CCOC(=O)N=NC(=O)OCC FAMRKDQNMBBFBR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052582 BN Inorganic materials 0.000 claims abstract description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 4
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims abstract description 4
- 235000019399 azodicarbonamide Nutrition 0.000 claims abstract description 4
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 41
- 239000000203 mixture Substances 0.000 claims description 33
- 238000007493 shaping process Methods 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 16
- 238000003490 calendering Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 10
- SHLNMHIRQGRGOL-UHFFFAOYSA-N barium zinc Chemical compound [Zn].[Ba] SHLNMHIRQGRGOL-UHFFFAOYSA-N 0.000 claims description 8
- AGXUVMPSUKZYDT-UHFFFAOYSA-L barium(2+);octadecanoate Chemical group [Ba+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O AGXUVMPSUKZYDT-UHFFFAOYSA-L 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 claims description 5
- 239000011874 heated mixture Substances 0.000 claims description 5
- 239000004156 Azodicarbonamide Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000000047 product Substances 0.000 description 19
- 238000000465 moulding Methods 0.000 description 4
- VGUWZCUCNQXGBU-UHFFFAOYSA-N 3-[(4-methylpiperazin-1-yl)methyl]-5-nitro-1h-indole Chemical compound C1CN(C)CCN1CC1=CNC2=CC=C([N+]([O-])=O)C=C12 VGUWZCUCNQXGBU-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0085—Use of fibrous compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Emergency Medicine (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses a polytetrafluoroethylene-based low-thermal-resistance heat dissipation material and a preparation method thereof, wherein the heat dissipation material comprises the following material components: polytetrafluoroethylene: 60-90 parts of heat-conducting carbon fiber powder: 5-15 parts of composite heat dissipation material: 2-10 parts of nitride filler: 2-8 parts of an initiator: 3-7 parts of extrusion assisting agent: 1-4 parts of foaming agent: 1-5 parts of dispersing agent: 2-5 parts of stabilizer: 1-3 parts of foaming agent, wherein the foaming agent is one of diethyl azodicarboxylate and azodicarboxamide, the composite heat dissipation material is graphene particles, the nitride filler is one or two of boron nitride, aluminum nitride and silicon nitride, the initiator is dibenzoyl peroxide, and the extrusion aid is one of petroleum ether and toluene.
Description
Technical Field
The invention relates to the technical field of polytetrafluoroethylene materials, in particular to a polytetrafluoroethylene-based low-thermal-resistance heat dissipation material and a preparation method thereof.
Background
Polytetrafluoroethylene is PTFE, commonly known as plastic king, is an artificially synthesized polymer material using fluorine to replace all hydrogen atoms in polyethylene, is generally known as a non-stick coating or an easily cleaned material, is used in the fields of electric appliances, chemical industry, aviation, machinery and the like, and is widely used in the elastomer and rubber industries and in corrosion prevention.
The preparation method of the polytetrafluoroethylene composite material with the authorization bulletin number of CN102731941A comprises the following steps: sequentially adding polytetrafluoroethylene and filler into water added with a surfactant, and uniformly stirring.
After the prepared polytetrafluoroethylene is used, some problems still exist, the heat resistance of some polytetrafluoroethylene is high, heat dissipation is difficult, the heat conduction capacity of the polytetrafluoroethylene is poor, and the material is limited in daily use, so that a polytetrafluoroethylene-based low-heat resistance heat dissipation material and a preparation method thereof are needed to solve the problems.
Disclosure of Invention
The invention aims to provide a polytetrafluoroethylene-based low-thermal-resistance heat dissipation material and a preparation method thereof, so as to solve the defects in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
A polytetrafluoroethylene-based low-thermal-resistance heat dissipation material comprises the following material components: polytetrafluoroethylene: 60-90 parts of heat-conducting carbon fiber powder: 5-15 parts of composite heat dissipation material: 2-10 parts of nitride filler: 2-8 parts of an initiator: 3-7 parts of extrusion assisting agent: 1-4 parts of foaming agent: 1-5 parts of dispersing agent: 2-5 parts of stabilizer: 1-3 parts of a compound, wherein,
The foaming agent is one of diethyl azodicarboxylate and azodicarbonamide, the composite heat dissipation material is graphene particles, and the nitride filler is one or two of boron nitride, aluminum nitride and silicon nitride.
Preferably, the initiator is dibenzoyl peroxide, and the extrusion aid is one of petroleum ether and toluene.
Preferably, the dispersing agent is barium stearate, and the stabilizer is one of a barium zinc stabilizer and an organotin stabilizer.
The method comprises the steps of setting the environmental temperature to 25 ℃, measuring the temperature by a thermal detection tester before the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene are prepared, preparing a polytetrafluoroethylene finished product material, mixing the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene in a sealed container, placing the mixture on a carrying platform, measuring the temperature of the mixture by the thermal detection tester, heating the mixture to a specified higher temperature by a heating plate, measuring the instant value of the heated mixture by the thermal detection tester to be T 1, placing the polytetrafluoroethylene finished product material on the carrying platform, heating to the specified higher temperature, measuring the instant value of the heated polytetrafluoroethylene finished product material by the thermal detection tester to be T 2, and comparing the temperature T 1≤T2 or T 1≥T2 or T 1＝T2 of the mixture and the polytetrafluoroethylene finished product material.
A preparation method of a polytetrafluoroethylene-based low-thermal-resistance heat dissipation material comprises the following steps:
S1, weighing: cutting polytetrafluoroethylene material into particles, weighing polytetrafluoroethylene particles, heat-conducting carbon fiber powder, composite heat dissipation material and nitride filler;
s2, feeding: putting polytetrafluoroethylene particles into a feeder, and proportionally adding heat-conducting carbon fiber powder, a composite heat dissipation material and nitride filler to obtain preparation expectation;
s3, stirring and reacting: uniformly stirring the preparation expectation, preparing a reaction kettle, and mixing the preparation expectation, an initiator, a dispersing agent and a stabilizing agent in the reaction kettle for reaction to obtain a reaction material;
S4, pushing treatment: adding a foaming agent into the reaction materials, mixing for a period of time at a certain temperature, then putting the mixture into a cavity in a pushing press, and forming the materials after the materials are pushed to a pushing opening of the pushing press;
s5, calendaring and stretching: adding an extrusion aid into the pushed material, and extruding or stretching the material after the material is made into a required shape by using a calendaring roller to obtain a stretched material;
s6, shaping: the stretching material is put into a shaping mould, the temperature is changed in the shaping process, and then the material is finally stood for shaping.
Preferably, in the step S1, the grain size range of the cut polytetrafluoroethylene material is 0.5-20 mm, and in the step S2, the ratio of polytetrafluoroethylene particles, heat conducting carbon fiber powder, composite heat dissipation material and nitride filler is 8:2:1:1.
Preferably, in the step S3, the preparation method expects that the uniform stirring rotation speed is 50-120 r/min, and the reaction temperature of the preparation method expects, the initiator, the dispersing agent and the stabilizer in the reaction kettle is 22-38 ℃.
Preferably, in the step S4, the ratio of the reaction material to the foaming agent is 5:0.3, the set temperature is 22-100 ℃, and the reaction is carried out for 0.5-1.5 hours and then the reaction product is kept stand.
Preferably, in the step S4, the pushing pressure in the pushing machine is 0.2-1MPa, and the pushing machine advances to the pushing port at a speed of 0.5-5 cm/S.
Preferably, in the step S5, the rotating speed of the calendaring roller is 20-60 r/min, and the extrusion or stretching speed of the material is 0.6 mm/S.
Preferably, in the step S6, the temperature of the stretching material in the shaping mold is 90-260 ℃, and the stretching material is finally kept stand for 1-3 hours.
According to the polytetrafluoroethylene-based low-thermal-resistance heat dissipation material and the preparation method thereof, provided by the invention, the heat conduction carbon fiber powder, the graphene particles and the aluminum nitride are combined with polytetrafluoroethylene after being fed, stirred and reacted, so that the heat conduction capacity of the material is enhanced, the thermal resistance is low, the insulativity of the aluminum nitride is improved while the heat is effectively conducted, and the prepared material meets the performances of quick heat conduction and strong heat dissipation; the dibenzoyl peroxide, the barium stearate and the barium zinc stabilizer can react with the polytetrafluoroethylene mixture to accelerate the reaction speed of the polytetrafluoroethylene, and the barium zinc stabilizer can also increase the reaction stability; through setting up azodicarbonic acid diethyl ester and petroleum ether, the blowing agent azodicarbonic acid diethyl ester can be with the mixture when pushing and pressing the intra-machine operation, with the material foaming for porous structure material, make the thermal-insulated nature obtain promoting, petroleum ether makes the material deformability reinforcing, and shaping speed is faster.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
Fig. 1 is a schematic diagram of steps of a preparation method provided in an embodiment of a polytetrafluoroethylene-based low thermal resistance heat dissipation material and a preparation method thereof.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
Example 1
As shown in fig. 1, the polytetrafluoroethylene-based low-thermal-resistance heat dissipation material provided by the embodiment of the invention comprises the following material components: polytetrafluoroethylene: 60 parts of heat-conducting carbon fiber powder: 8 parts of composite heat dissipation material: 4 parts of nitride filler: 5 parts of an initiator: 3 parts of extrusion assisting agent: 2 parts of foaming agent: 1 part of dispersing agent: 4 parts of stabilizer: 2 parts of the components are mixed together,
The foaming agent is diethyl azodicarboxylate, the composite heat sink material is graphene particles, and the nitride filler is boron nitride.
Preferably, the initiator is dibenzoyl peroxide and the extrusion aid is petroleum ether.
Preferably, the dispersing agent is barium stearate and the stabilizer is an organotin stabilizer.
A preparation method of a polytetrafluoroethylene-based low-thermal-resistance heat dissipation material comprises the following steps:
s1, weighing: cutting polytetrafluoroethylene material into particles, weighing polytetrafluoroethylene particles, heat-conducting carbon fiber powder, composite heat dissipation materials and nitride fillers, wherein the particle size range of the cut polytetrafluoroethylene material is 5 mm;
S2, feeding: putting polytetrafluoroethylene particles into a feeder, and proportionally adding heat-conducting carbon fiber powder, composite heat dissipation materials and nitride fillers, wherein the proportion among the polytetrafluoroethylene particles, the heat-conducting carbon fiber powder, the composite heat dissipation materials and the nitride fillers is 8:2:1:1, so as to obtain preparation expectation;
S3, stirring and reacting: uniformly stirring the preparation expectation, wherein the uniform stirring speed of the preparation expectation is 70 r/min, preparing a reaction kettle, and mixing and reacting the preparation expectation, an initiator, a dispersing agent and a stabilizing agent in the reaction kettle, wherein the reaction temperature in the reaction kettle is 28 ℃;
S4, pushing treatment: adding a foaming agent into the reaction material, wherein the ratio of the reaction material to the foaming agent is 5:0.3, the set temperature is 35 ℃, standing after reacting for 1 hour, then putting the mixture into a cavity in a pushing press, wherein the pushing pressure value in the pushing press is 0.8MPa, advancing to a pushing port at a speed of 1 cm/s, and forming the material after the material is pushed to the pushing port of the pushing press;
S5, calendaring and stretching: adding an extrusion aid into the pushed material, using a calendaring roller to prepare the material into a required shape, wherein the rotating speed of the calendaring roller is 45 revolutions per minute, extruding or stretching the material, and the extruding or stretching speed of the material is 0.6 millimeter per second to obtain a stretched material;
S6, shaping: the stretching material is put into a shaping mould, the temperature of the stretching material in the shaping mould is 180 ℃, the temperature is changed in the shaping process, and then the material is finally placed for shaping, and finally placed for 2 hours.
The method comprises the steps of setting the environmental temperature to 25 ℃, measuring the temperature by a thermal detection tester before the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene are prepared, preparing a polytetrafluoroethylene finished product material, mixing the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene in a sealed container, placing the mixture on a carrying platform, measuring the temperature of the mixture by the thermal detection tester, heating the mixture to a specified higher temperature by a heating plate, measuring the instant value of the heated mixture by the thermal detection tester to be T 1, placing the polytetrafluoroethylene finished product material on the carrying platform, heating to the specified higher temperature, measuring the instant value of the heated polytetrafluoroethylene finished product material by the thermal detection tester to be T 2, comparing the temperature of the mixture and the temperature of the polytetrafluoroethylene finished product material, and comparing the temperature of the mixture and the polytetrafluoroethylene finished product material to T 1<T2.
Example two
The polytetrafluoroethylene-based low-thermal resistance heat dissipation material provided by the embodiment of the invention comprises the following material components: polytetrafluoroethylene: 85 parts of heat-conducting carbon fiber powder: 12 parts of composite heat dissipation material: 8 parts of nitride filler: 6 parts of an initiator: 6 parts of extrusion assisting agent: 3 parts of foaming agent: 2 parts of dispersing agent: 2 parts of stabilizer: 1 part of the total weight of the mixture,
The foaming agent is azodicarbonamide, the composite heat dissipation material is graphene particles, and the nitride filler is aluminum nitride.
Preferably, the initiator is dibenzoyl peroxide and the extrusion aid is toluene.
Preferably, the dispersing agent is barium stearate, and the stabilizer is barium zinc stabilizer.
A preparation method of a polytetrafluoroethylene-based low-thermal-resistance heat dissipation material comprises the following steps:
S1, weighing: cutting polytetrafluoroethylene material into particles, weighing polytetrafluoroethylene particles, heat-conducting carbon fiber powder, composite heat dissipation materials and nitride fillers, wherein the particle size range of the cut polytetrafluoroethylene material is 10 millimeters;
S2, feeding: putting polytetrafluoroethylene particles into a feeder, and proportionally adding heat-conducting carbon fiber powder, composite heat dissipation materials and nitride fillers, wherein the proportion among the polytetrafluoroethylene particles, the heat-conducting carbon fiber powder, the composite heat dissipation materials and the nitride fillers is 8:2:1:1, so as to obtain preparation expectation;
S3, stirring and reacting: uniformly stirring the preparation expectation, preparing a reaction kettle, and mixing the preparation expectation, an initiator, a dispersing agent and a stabilizing agent in the reaction kettle for reaction, wherein the stirring speed of the preparation expectation is 100 revolutions per minute, and the reaction temperature in the reaction kettle is 32 ℃;
S4, pushing treatment: adding a foaming agent into the reaction material, wherein the ratio of the reaction material to the foaming agent is 5:0.3, the set temperature is 36 ℃, standing after reacting for 1 hour, then putting the mixture into a cavity in a pushing press, wherein the pushing pressure value in the pushing press is 0.8MPa, advancing to a pushing port at a speed of 3 cm/s, and forming the material after the material is pushed to the pushing port of the pushing press;
S5, calendaring and stretching: adding an extrusion aid into the pushed material, using a calendaring roller to prepare the material into a required shape, wherein the rotating speed of the calendaring roller is 60 revolutions per minute, extruding or stretching the material, and the extruding or stretching speed of the material is 0.6 millimeter per second, so as to obtain a stretched material;
S6, shaping: the stretching material is put into a shaping mould, the temperature of the stretching material in the shaping mould is 180 ℃, the temperature is changed in the shaping process, and then the material is finally placed for shaping, and finally placed for 2 hours.
The method comprises the steps of setting the environmental temperature to 25 ℃, measuring the temperature by a thermal detection tester before the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene are prepared, preparing a polytetrafluoroethylene finished product material, mixing the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene in a sealed container, placing the mixture on a carrying platform, measuring the temperature of the mixture by the thermal detection tester, heating the mixture to a specified higher temperature by a heating plate, measuring the instant value of the heated mixture by the thermal detection tester to be T 1, placing the polytetrafluoroethylene finished product material on the carrying platform, heating to the specified higher temperature, measuring the instant value of the heated polytetrafluoroethylene finished product material by the thermal detection tester to be T 2, comparing the temperature of the mixture and the temperature of the polytetrafluoroethylene finished product material, and comparing the temperature of the mixture and the polytetrafluoroethylene finished product material to T 1<T2.
Example III
The polytetrafluoroethylene-based low-thermal resistance heat dissipation material provided by the embodiment of the invention comprises the following material components: polytetrafluoroethylene: 85 parts of heat-conducting carbon fiber powder: 10 parts of composite heat dissipation material: 7 parts of nitride filler: 6 parts of an initiator: 4 parts of extrusion assisting agent: 3 parts of foaming agent: 3 parts of dispersing agent: 3 parts of stabilizer: 2 parts of the components are mixed together,
The foaming agent is diethyl azodicarboxylate, the composite heat sink material is graphene particles, and the nitride filler is aluminum nitride.
Preferably, the initiator is dibenzoyl peroxide and the extrusion aid is petroleum ether.
Preferably, the dispersing agent is barium stearate, and the stabilizer is barium zinc stabilizer.
A preparation method of a polytetrafluoroethylene-based low-thermal-resistance heat dissipation material comprises the following steps:
s1, weighing: cutting polytetrafluoroethylene material into particles, weighing polytetrafluoroethylene particles, heat-conducting carbon fiber powder, composite heat dissipation materials and nitride fillers, wherein the particle size range of the cut polytetrafluoroethylene material is 12 millimeters;
S2, feeding: putting polytetrafluoroethylene particles into a feeder, and proportionally adding heat-conducting carbon fiber powder, composite heat dissipation materials and nitride fillers, wherein the proportion among the polytetrafluoroethylene particles, the heat-conducting carbon fiber powder, the composite heat dissipation materials and the nitride fillers is 8:2:1:1, so as to obtain preparation expectation;
S3, stirring and reacting: uniformly stirring the preparation expectation, preparing a reaction kettle, and mixing the preparation expectation, an initiator, a dispersing agent and a stabilizing agent in the reaction kettle for reaction, wherein the stirring speed of the preparation expectation is 100 revolutions per minute, and the reaction temperature in the reaction kettle is 32 ℃;
S4, pushing treatment: adding a foaming agent into the reaction material, wherein the ratio of the reaction material to the foaming agent is 5:0.3, the set temperature is 75 ℃, standing after reacting for 1 hour, then putting the mixture into a cavity in a pushing press, wherein the pushing pressure value in the pushing press is 0.8MPa, advancing to a pushing port at a speed of 4 cm/s, and forming the material after the material is pushed to the pushing port of the pushing press;
S5, calendaring and stretching: adding an extrusion aid into the pushed material, using a calendaring roller to prepare the material into a required shape, wherein the rotating speed of the calendaring roller is 50 revolutions per minute, extruding or stretching the material, and the extruding or stretching speed of the material is 0.6 millimeter per second to obtain a stretched material;
S6, shaping: the stretching material is put into a shaping mould, the temperature of the stretching material in the shaping mould is 180 ℃, the temperature is changed in the shaping process, and then the material is finally placed for shaping, and finally placed for 2 hours.
The method comprises the steps of setting the environmental temperature to 25 ℃, measuring the temperature by a thermal detection tester before the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene are prepared, preparing a polytetrafluoroethylene finished product material, mixing the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene in a sealed container, placing the mixture on a carrying platform, measuring the temperature of the mixture by the thermal detection tester, heating the mixture to a specified higher temperature by a heating plate, measuring the instant value of the heated mixture by the thermal detection tester to be T 1, placing the polytetrafluoroethylene finished product material on the carrying platform, heating to the specified higher temperature, measuring the instant value of the heated polytetrafluoroethylene finished product material by the thermal detection tester to be T 2, comparing the temperature of the mixture and the temperature of the polytetrafluoroethylene finished product material, and comparing the temperature of the mixture and the polytetrafluoroethylene finished product material to T 1<T2.
Working principle: according to the embodiment I, the embodiment II and the embodiment III, the components of the preparation materials are different, the temperature, the time and the like in preparation are different, the foaming agent, the nitride material and the like are different, the other parameters are consistent, the finally obtained polytetrafluoroethylene-based low-thermal-resistance heat dissipation material is subjected to experimental comparison, in the three groups of embodiments, the effect of the embodiment III is optimal, in the embodiment III, polytetrafluoroethylene materials, heat-conducting carbon fiber powder, graphene particles and aluminum nitride are weighed and uniformly stirred, the heat dissipation effect of the heat-conducting carbon fiber powder and the graphene particles is good, the heat conduction capability is high, the thermal resistance is low, the aluminum nitride effectively conducts heat and has insulativity, the polytetrafluoroethylene materials are combined with the heat-conducting carbon fiber powder, the graphene particles and the aluminum nitride, the materials are mixed in a reaction kettle together with dibenzoyl peroxide, barium stearate and barium zinc stabilizer, a dibenzoyl peroxide initiator and barium stearate are high in decomposition speed, the reaction speed of the polytetrafluoroethylene materials is increased, the barium zinc stabilizer is increased in the reaction stability of the materials, the mixture is put into a pushing machine after the foaming agent is added, the foaming agent is pushed into a pushing machine, the foaming agent is high in the expansion molding die, and the shape of the foaming agent is pushed out of the porous material is shaped, and the molding aid is formed by the molding material is high in the shape of the molding die, and is deformed by the molding die.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A polytetrafluoroethylene-based low-thermal-resistance heat dissipation material is characterized by comprising the following material components: polytetrafluoroethylene: 60-90 parts of heat-conducting carbon fiber powder: 5-15 parts of composite heat dissipation material: 2-10 parts of nitride filler: 2-8 parts of an initiator: 3-7 parts of extrusion assisting agent: 1-4 parts of foaming agent: 1-5 parts of dispersing agent: 2-5 parts of stabilizer: 1-3 parts of a compound, wherein,
The foaming agent is one of diethyl azodicarboxylate and azodicarbonamide, the composite heat dissipation material is graphene particles, and the nitride filler is one or two of boron nitride, aluminum nitride and silicon nitride.
The method comprises the steps of setting the environmental temperature to 25 ℃, measuring the temperature by a thermal detection tester before the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene are prepared, preparing a polytetrafluoroethylene finished product material, mixing the thermal conductive carbon fiber powder, the graphene particles, the aluminum nitride and the polytetrafluoroethylene in a sealed container, placing the mixture on a carrying platform, measuring the temperature of the mixture by the thermal detection tester, heating the mixture to a specified higher temperature by a heating plate, measuring the instant value of the heated mixture by the thermal detection tester to be T1, placing the polytetrafluoroethylene finished product material on the carrying platform to the specified higher temperature, measuring the instant value of the heated polytetrafluoroethylene finished product material to be T2 by the thermal detection tester, and comparing the temperature T1 of the mixture and the temperature T2 of the polytetrafluoroethylene finished product material or T1 of the mixture to be T2 or T1 = T2.
2. The polytetrafluoroethylene-based low thermal resistance heat dissipation material according to claim 1, wherein the initiator is dibenzoyl peroxide and the extrusion aid is one of petroleum ether and toluene.
3. The polytetrafluoroethylene-based low thermal resistance heat dissipating material according to claim 1, wherein said dispersant is barium stearate, and said stabilizer is one of a barium zinc stabilizer and an organotin stabilizer.
4. A method for preparing a polytetrafluoroethylene-based low thermal resistance heat dissipation material, comprising the polytetrafluoroethylene-based low thermal resistance heat dissipation material according to any one of claims 1-3, characterized by comprising the steps of:
S1, weighing: cutting polytetrafluoroethylene material into particles, weighing polytetrafluoroethylene particles, heat-conducting carbon fiber powder, composite heat dissipation material and nitride filler;
s2, feeding: putting polytetrafluoroethylene particles into a feeder, and proportionally adding heat-conducting carbon fiber powder, a composite heat dissipation material and nitride filler to obtain preparation expectation;
s3, stirring and reacting: uniformly stirring the preparation expectation, preparing a reaction kettle, and mixing the preparation expectation, an initiator, a dispersing agent and a stabilizing agent in the reaction kettle for reaction to obtain a reaction material;
S4, pushing treatment: adding a foaming agent into the reaction materials, mixing for a period of time at a certain temperature, then putting the mixture into a cavity in a pushing press, and forming the materials after the materials are pushed to a pushing opening of the pushing press;
s5, calendaring and stretching: adding an extrusion aid into the pushed material, and extruding or stretching the material after the material is made into a required shape by using a calendaring roller to obtain a stretched material;
s6, shaping: the stretching material is put into a shaping mould, the temperature is changed in the shaping process, and then the material is finally stood for shaping.
5. The method for preparing a polytetrafluoroethylene-based low thermal resistance heat dissipation material according to claim 4, wherein in the step S1, the grain size range of the cut polytetrafluoroethylene material is 0.5-20 mm, and in the step S2, the ratio of polytetrafluoroethylene particles, heat conductive carbon fiber powder, composite heat dissipation material and nitride filler is 8:2:1:1.
6. The method for preparing a polytetrafluoroethylene-based low thermal resistance heat dissipation material according to claim 4, wherein in the step S3, the preparation is carried out at a speed of 50-120 rpm in anticipation of uniform stirring, and the reaction temperature of the preparation, initiator, dispersant and stabilizer in the reaction kettle is 22-38 ℃.
7. The method for preparing a polytetrafluoroethylene-based low thermal resistance heat dissipation material according to claim 4, wherein in the step S4, the ratio of the reaction material to the foaming agent is 5:0.3, the set temperature is 22-100 ℃, and the reaction is allowed to stand for 0.5-1.5 hours.
8. The method for preparing a polytetrafluoroethylene-based low thermal resistance heat dissipating material according to claim 4, wherein in S4, the pushing pressure in the pushing machine is 0.2 to 1MPa, and the pushing pressure is advanced to the pushing port at a speed of 0.5 to 5 cm/S.
9. The method for preparing a polytetrafluoroethylene-based low thermal resistance heat dissipating material according to claim 4, wherein in S5, the rotation speed of the calender roll is 20-60 rpm, and the material extrusion or stretching speed is 0.6 mm/S.
10. The method for preparing a polytetrafluoroethylene-based low thermal resistance heat dissipation material according to claim 4, wherein in the step S6, the temperature of the stretching material in the shaping mold is 90-260 ℃, and the stretching material is finally kept stand for 1-3 hours.
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