CN117004232B - Low-volatility high-resilience double-component heat conduction gasket and preparation method thereof - Google Patents
Low-volatility high-resilience double-component heat conduction gasket and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 229920002545 silicone oil Polymers 0.000 claims abstract description 26
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 22
- 229920001971 elastomer Polymers 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 19
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 17
- 239000003054 catalyst Substances 0.000 claims abstract description 14
- 239000000806 elastomer Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 9
- 239000003112 inhibitor Substances 0.000 claims abstract description 9
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- 239000002243 precursor Substances 0.000 claims abstract description 9
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 7
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 18
- 230000005484 gravity Effects 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 9
- 229910052697 platinum Inorganic materials 0.000 claims description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000012948 isocyanate Substances 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 5
- 150000002513 isocyanates Chemical class 0.000 claims description 5
- 229920000800 acrylic rubber Polymers 0.000 claims description 4
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 4
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229920000058 polyacrylate Polymers 0.000 claims description 4
- 230000017525 heat dissipation Effects 0.000 abstract description 5
- 239000000306 component Substances 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 239000000741 silica gel Substances 0.000 description 9
- 229910002027 silica gel Inorganic materials 0.000 description 9
- 238000001816 cooling Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000035699 permeability Effects 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- SCPWMSBAGXEGPW-UHFFFAOYSA-N dodecyl(trimethoxy)silane Chemical compound CCCCCCCCCCCC[Si](OC)(OC)OC SCPWMSBAGXEGPW-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- RSKGMYDENCAJEN-UHFFFAOYSA-N hexadecyl(trimethoxy)silane Chemical compound CCCCCCCCCCCCCCCC[Si](OC)(OC)OC RSKGMYDENCAJEN-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- OWRXWSVBJIIORE-UHFFFAOYSA-N 3,7,11-trimethyldodec-1-yn-3-ol Chemical compound CC(C)CCCC(C)CCCC(C)(O)C#C OWRXWSVBJIIORE-UHFFFAOYSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical group C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- KQAHMVLQCSALSX-UHFFFAOYSA-N decyl(trimethoxy)silane Chemical compound CCCCCCCCCC[Si](OC)(OC)OC KQAHMVLQCSALSX-UHFFFAOYSA-N 0.000 description 1
- AMTWCFIAVKBGOD-UHFFFAOYSA-N dioxosilane;methoxy-dimethyl-trimethylsilyloxysilane Chemical compound O=[Si]=O.CO[Si](C)(C)O[Si](C)(C)C AMTWCFIAVKBGOD-UHFFFAOYSA-N 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- BLCTWBJQROOONQ-UHFFFAOYSA-N ethenyl prop-2-enoate Chemical compound C=COC(=O)C=C BLCTWBJQROOONQ-UHFFFAOYSA-N 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229940083037 simethicone Drugs 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
- C08K2003/282—Binary compounds of nitrogen with aluminium
-
- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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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)
- Sealing Material Composition (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A low-volatility high-resilience double-component heat conduction gasket and a preparation method thereof are provided, wherein the gasket raw materials comprise: 100 parts of vinyl silicone oil; 500-1000 parts of nonmetal heat conducting particles; 25-40 parts of a precursor of a high polymer elastomer material; 3-8 parts of a cross-linking agent; 0.01-0.1 part of a catalyst; 0.06-0.3 parts of inhibitor; 5-20 parts of a silane coupling agent; 0.5-2.5 parts of vulcanizing agent. The preparation method comprises the following steps: stirring nonmetallic heat-conducting particles and a silane coupling agent to obtain mixed particles; uniformly stirring vinyl silicone oil, mixed particles, a polymer elastomer material precursor, a cross-linking agent and an inhibitor; then adding a catalyst and a vulcanizing agent, and stirring to obtain a mixed material; and transferring the mixed material to a vulcanizing machine, and curing at the temperature of 130-160 ℃ to obtain the low-volatility high-resilience dual-component heat conduction gasket. The heat conducting gasket is low in volatility and high in resilience, and meets the long-time stable and efficient heat dissipation requirement of the power battery.
Description
Technical Field
The invention relates to the field of heat conducting materials of new energy automobiles, in particular to a low-volatility high-resilience bi-component heat conducting gasket and a preparation method thereof.
Background
The power battery is a core component of a new energy automobile, the power battery can continuously generate heat when the new energy automobile works for a long time, and the normal function of the power battery can be affected when the heat generation is too high, so that the power battery needs to be effectively radiated. In general, heat dissipation methods of the power battery include:
1. air-cooled heat dissipation
On the one hand, the high heat generated during the working of the power battery is taken away through the installation of the cooling fan, and on the other hand, the heat conduction silica gel gaskets are respectively added at the top and the bottom of the electrode terminal, so that the heat which is not easy to dissipate is conducted to the metal shell from the top and the bottom through the heat conduction silica gel gaskets to dissipate heat. Meanwhile, the heat-conducting silica gel gasket also has high electrical insulation and puncture resistance requirements, so that a better guarantee effect is achieved on the power battery.
2. Liquid cooling heat dissipation
On the one hand, the liquid cooling pipe absorbs high heat generated during the operation of the power battery, the specific heat capacity of the cooling liquid is large, and the heat generated during the operation of the power battery can be absorbed, so that the power battery can operate at a safe temperature. On the other hand, through setting up the heat conduction silica gel gasket, utilize insulating properties and resilience of heat conduction silica gel gasket, prevent vibration and friction damage and the hidden danger of short circuit between the battery, be the best paving material of water-cooling scheme.
In conclusion, the heat-conducting silica gel gasket is a widely accepted heat-conducting material in the industry, and has the advantages of simple production equipment, high heat conductivity, good stability and the like. However, in the application, the problem of high volatiles arises due to too long a use time or too high a temperature. In addition, when the service life of the silica gel gasket is long, under the action of long-term heating and pressure among parts, silicone oil in the gasket can gradually exude, the service life of the gasket is lost when the silicone oil is light, and the battery parts are polluted when the silicone oil is heavy. Traditional heat conduction silica gel gasket resilience is relatively poor, can't rebound fast after receiving the pressure effect, makes there is the air gap between it and the battery part, and the heat transfer passageway is destroyed to influence the radiating effect.
Therefore, how to solve the above-mentioned drawbacks of the prior art is a subject to be studied and solved by the present invention.
Disclosure of Invention
The invention aims to provide a low-volatility high-resilience bi-component heat conduction gasket and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
the low-volatility high-resilience double-component heat conduction gasket comprises the following raw materials in parts by weight:
100 parts of vinyl silicone oil;
500-1000 parts of nonmetal heat conducting particles;
25-40 parts of a precursor of a high polymer elastomer material;
3-8 parts of a cross-linking agent;
0.01-0.1 part of a catalyst;
0.06-0.3 parts of inhibitor;
5-20 parts of a silane coupling agent;
0.5-2.5 parts of vulcanizing agent.
According to a further technical scheme, the volatilization amount of the vinyl silicone oil is less than or equal to 100ppm, the viscosity of the vinyl silicone oil is 40-2000 mPa, and the vinyl content is 0.23-1.74%.
According to a further technical scheme, the nonmetal heat conducting particles are one or more of aluminum oxide, aluminum nitride, boron nitride, aluminum hydroxide, zinc oxide, magnesium oxide, graphene and carbon nanotubes.
According to a further technical scheme, the polymer elastomer material precursor is one or more of liquid acrylate rubber, liquid ethylene acrylate rubber and liquid hydroxy acrylic rubber. The addition of the liquid elastomer is beneficial to reducing the viscosity of the composite system, improving the dispersibility of the filler in the composite system and improving the processability of the heat-conducting silica gel.
According to a further technical scheme, the cross-linking agent is hydrogen-containing silicone oil, the volatilization amount is less than or equal to 300ppm, the viscosity is 10-50 mPa, and the hydrogen content is 0.10-0.28%.
According to a further technical scheme, the catalyst is a platinum catalyst, the platinum content is 1600-1800 ppm, and the viscosity is 200-400 mPa.
According to a further technical scheme, the inhibitor is a silicone inhibitor or an alkynol inhibitor, and comprises 3,7, 11-trimethyldodecyn-3-ol and tetra-vinyl cyclotetrasiloxane.
According to a further technical scheme, the silane coupling agent is one or more of decyl trimethoxy silane coupling agent, dodecyl trimethoxy silane, hexadecyl trimethoxy silane, vinyl triethoxy silane and vinyl trimethoxy silane.
According to a further technical scheme, the vulcanizing agent is an isocyanate hydroxyl system.
In order to achieve the purpose, the technical scheme adopted by the method is as follows:
a preparation method of a low-volatility high-resilience double-component heat conduction gasket comprises the following steps:
step one, adding nonmetallic heat-conducting particles and a silane coupling agent into a planetary gravity stirrer, mixing for 4-7 min at a rotating speed of 1400-1800 r/min to obtain mixed particles, and cooling for later use;
step two, adding 100 parts of vinyl silicone oil, 500-1000 parts of mixed particles, 25-40 parts of polymer elastomer material precursor, 3-8 parts of cross-linking agent and 0.06-0.3 part of inhibitor into a planetary gravity stirrer, setting the temperature to be 130-160 ℃, the rotating speed to be 20-80 r/min, the vacuum degree to be minus 0.1MPa, and stirring for 2-6 hours to be completely uniform;
adding 0.01-0.1 part of catalyst and 0.5-2.5 parts of vulcanizing agent into a planetary gravity stirrer, and continuously vacuumizing and stirring for 10-15 min without heating to obtain a mixed material;
and step four, transferring the mixed material uniformly mixed in the step three to a vulcanizing machine, and curing at the temperature of 130-160 ℃ to obtain the low-volatility high-resilience dual-component heat conduction gasket.
In the scheme, the heat conducting powder and the silane coupling agent are blended in advance in the first step, so that the heat conducting powder can be dispersed in the integral gasket more uniformly.
In the scheme, chain molecules in the high Wen Cushi rubber are crosslinked into net-shaped molecules through vulcanization in the fourth step, so that the performances of tension, hardness, aging, elasticity and the like of the gasket are enhanced.
The working principle and the advantages of the invention are as follows:
compared with the prior art, the invention mixes the precursor of the high polymer elastomer material with vinyl silicone oil with the volatilization amount less than or equal to 100ppm, and the precursor and the vinyl silicone oil are used as the base material of the heat conduction gasket together, and the crosslinking density between the two components can be mutually increased to form a better crosslinking network, thereby effectively inhibiting the escape of small molecules.
The added high polymer elastomer has ultrahigh heat resistance and weather resistance, reduces oil seepage of the heat conducting gasket at high temperature, provides good elasticity, can effectively reduce air heat resistance between power battery devices, forms a good heat transfer passage, and can well meet the long-time stable, reliable and efficient heat dissipation requirements of the power battery of the new energy automobile.
Detailed Description
The invention is further described below with reference to examples:
the following detailed description will clearly illustrate the present invention, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the technology taught herein without departing from the spirit and scope of the present invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the terms "comprising," "including," "having," and the like are intended to be open-ended terms, meaning including, but not limited to.
The term (terms) as used herein generally has the ordinary meaning of each term as used in this field, in this disclosure, and in the special context, unless otherwise noted. Certain terms used to describe the present disclosure are discussed below, or elsewhere in this specification, to provide additional guidance to those skilled in the art in connection with the description herein.
Example 1
A preparation method of a low-volatility high-resilience double-component heat conduction gasket comprises the following steps:
(1) Adding 500 parts of aluminum oxide and 5 parts of dodecyl trimethoxy silane into a planetary gravity stirrer, mixing for 5min at the rotating speed of 1400r/min to obtain mixed particles, and cooling for later use;
(2) 100 parts of vinyl silicone oil with the viscosity of 500, 500 parts of mixed particles, 25 parts of liquid acrylate rubber, 5 parts of hydrogen-containing silicone oil with the viscosity of 30 and 0.06 part of tetra-vinyl cyclotetrasiloxane are added into a planetary gravity stirrer, the temperature is set to 130 ℃, the rotating speed is 40r/min, the vacuum degree is-0.1 MPa, and stirring is carried out for 3 hours until the mixture is completely uniform;
(3) Adding 0.06 part of platinum catalyst and 1.5 parts of isocyanate into a planetary gravity stirrer, and continuously vacuumizing and stirring for 10-15 min without heating to obtain a mixed material;
(4) And transferring the uniformly mixed material to a vulcanizing machine, and curing for 30min at 150 ℃ to obtain the low-volatility high-resilience double-component heat-conducting gasket.
Example 2
A preparation method of a low-volatility high-resilience double-component heat conduction gasket comprises the following steps:
(1) Adding 500 parts of aluminum oxide, 200 parts of aluminum hydroxide and 7 parts of hexadecyl trimethoxy silane into a planetary gravity stirrer, mixing for 5min at a rotating speed of 1500r/min to obtain mixed particles, and cooling for later use;
(2) Adding 100 parts of vinyl silicone oil with the viscosity of 500, 700 parts of mixed particles, 35 parts of liquid vinyl acrylate rubber, 5 parts of hydrogen-containing silicone oil with the viscosity of 30 and 0.06 part of tetra-vinyl cyclotetrasiloxane into a planetary gravity stirrer, setting the temperature to 130 ℃, the rotating speed to 40r/min, the vacuum degree to-0.1 MPa, and stirring for 4 hours to be completely uniform;
(3) Adding 0.06 part of platinum catalyst and 2 parts of isocyanate into a planetary gravity stirrer, continuously vacuumizing and stirring for 10-15 min without heating to obtain a mixed material;
(4) And transferring the uniformly mixed material to a vulcanizing machine, and curing for 30min at 150 ℃ to obtain the low-volatility high-resilience double-component heat-conducting gasket.
Example 3
A preparation method of a low-volatility high-resilience double-component heat conduction gasket comprises the following steps:
(1) Adding 400 parts of aluminum oxide, 100 parts of aluminum hydroxide, 200 parts of aluminum nitride and 10 parts of vinyl trimethoxy silane into a planetary gravity stirrer, mixing for 5min at a rotating speed of 1500r/min to obtain mixed particles, and cooling for later use;
(2) 100 parts of vinyl silicone oil with the viscosity of 500, 700 parts of mixed particles, 40 parts of liquid hydroxy acrylic rubber, 5 parts of hydrogen-containing silicone oil with the viscosity of 30 and 0.06 part of tetra-vinyl cyclotetrasiloxane are added into a planetary gravity stirrer, the temperature is set to 130 ℃, the rotating speed is 40r/min, the vacuum degree is-0.1 MPa, and stirring is carried out for 4 hours until the mixture is completely uniform;
(3) Adding 0.06 part of platinum catalyst and 2.5 parts of isocyanate into a planetary gravity stirrer, and continuously vacuumizing and stirring for 10-15 min without heating to obtain a mixed material;
(4) And transferring the uniformly mixed material to a vulcanizing machine, and curing for 30min at 150 ℃ to obtain the low-volatility high-resilience double-component heat-conducting gasket.
Comparative example 1
This comparative example 1 is different from example 1 in that: the heat conductive gasket of comparative example 1 was free of polymeric elastomer and vulcanizing agent. Other contents are the same as those of embodiment 1, and thus, a description thereof will be omitted.
Comparative example 2
This comparative example 2 is different from example 1 in that: the high molecular elastomer in the heat conductive gasket of this comparative example 2 was replaced with 500-viscosity simethicone of the same mass part. Other contents are the same as those of embodiment 1, and thus, a description thereof will be omitted.
The thermal pads obtained in examples 1 to 3 and comparative examples 1 and 2 were tested as follows.
Oil permeability test: cutting a circular sample with the diameter of 3cm by a knife, placing the sample on filter paper with the weight of m1, placing a clean glass plate on the sample, placing a weight which is more than or equal to 1kg on the glass plate, and baking all the substances for 2 hours at 130 ℃; after removal of the sample, the filter paper was weighed and the weight of the filter paper at this time was recorded as m2, oil permeability = (m 2-m 1)/m1×100%.
And (3) testing the volatility: cutting out a circular sample with the diameter of 3cm from the heat conducting gasket by a knife, placing the sample in a wide-mouth bottle, placing the lower part of the wide-mouth bottle on a heat table with the temperature of 150 ℃, covering the opening of the wide-mouth bottle by a surface dish with the weight of w1, weighing the surface dish with the weight of w2 after 24 hours, and calculating the volatility of the sample according to the formula: volatility= (w 2-w 1)/w1×100%.
Thermal conductivity coefficient: the results are shown in Table 1, tested according to ASTM D5470:
TABLE 1
From the data in table 1, it can be seen that when the high molecular elastomer and the vulcanizing agent are added, the obtained heat conductive gasket can have more excellent resilience, lower oil permeability and volatility without sacrificing the heat conductive property. Therefore, the blending effect of the elastomer and the vulcanization reaction of the vulcanizing agent can effectively improve the elasticity of the heat conducting elastic sheet and the adsorption effect of the heat conducting elastic sheet on the silicone oil, and improve the resilience and volatility of the heat conducting elastic sheet.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (3)
1. A low-volatility high-resilience double-component heat conduction gasket is characterized in that: the raw materials comprise the following components in parts by weight:
100 parts of vinyl silicone oil;
500-1000 parts of nonmetal heat conducting particles;
25-40 parts of a precursor of a high polymer elastomer material;
3-8 parts of a cross-linking agent;
0.01-0.1 part of a catalyst;
0.06-0.3 parts of inhibitor;
5-20 parts of a silane coupling agent;
0.5-2.5 parts of vulcanizing agent;
the volatilization amount of the vinyl silicone oil is less than or equal to 100ppm, the viscosity of the vinyl silicone oil is 40-2000 mPa.s, and the vinyl content is 0.23-1.74%; the preparation method comprises the following steps:
(1) Selecting a mixture of aluminum oxide, aluminum hydroxide and aluminum nitride as the nonmetallic heat-conducting particles, selecting vinyl trimethoxy silane as the silane coupling agent, selecting liquid hydroxy acrylic rubber as the precursor of the high polymer elastomer material, selecting hydrogen-containing silicone oil with the viscosity of 30 as the cross-linking agent, selecting tetra-vinyl cyclotetrasiloxane as the inhibitor, and selecting platinum catalyst as the catalyst; isocyanate is selected as the vulcanizing agent;
(2) 400 parts of aluminum oxide, 100 parts of aluminum hydroxide, 200 parts of aluminum nitride and 10 parts of vinyl trimethoxy silane are added into a planetary gravity stirrer, mixed for 5min at a rotating speed of 1500r/min to obtain mixed particles, and cooled for later use;
(3) 100 parts of vinyl silicone oil with the viscosity of 500, 700 parts of mixed particles, 40 parts of liquid hydroxy acrylic rubber, 5 parts of hydrogen-containing silicone oil with the viscosity of 30 and 0.06 part of tetra-vinyl cyclotetrasiloxane are added into a planetary gravity stirrer, the temperature is set to 130 ℃, the rotating speed is 40r/min, the vacuum degree is-0.1 MPa, and stirring is carried out for 4 hours until the mixture is completely uniform;
(4) Adding 0.06 part of platinum catalyst and 2.5 parts of isocyanate into a planetary gravity stirrer, continuously vacuumizing and stirring for 10-15 min without heating to obtain a mixed material;
(5) And transferring the uniformly mixed material to a vulcanizing machine, and curing for 30min at 150 ℃ to obtain the low-volatility high-resilience double-component heat-conducting gasket.
2. The two-component thermally conductive gasket of claim 1 wherein: the volatilization amount of the hydrogen-containing silicone oil is less than or equal to 300ppm, the viscosity is 10-50 mPa.s, and the hydrogen content is 0.10-0.28%.
3. The two-component thermally conductive gasket of claim 1 wherein: the platinum content of the platinum catalyst is 1600-1800 ppm, and the viscosity is 200-400 mPa.s.
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