CN117327400A - Graphite heat-conducting silica gel for heat dissipation of lithium battery of new energy automobile and preparation method thereof - Google Patents
Graphite heat-conducting silica gel for heat dissipation of lithium battery of new energy automobile and preparation method thereof Download PDFInfo
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- CN117327400A CN117327400A CN202311316387.7A CN202311316387A CN117327400A CN 117327400 A CN117327400 A CN 117327400A CN 202311316387 A CN202311316387 A CN 202311316387A CN 117327400 A CN117327400 A CN 117327400A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 223
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 239000000741 silica gel Substances 0.000 title claims abstract description 92
- 229910002027 silica gel Inorganic materials 0.000 title claims abstract description 92
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 81
- 239000010439 graphite Substances 0.000 title claims abstract description 81
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 48
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 60
- 239000000945 filler Substances 0.000 claims abstract description 40
- 239000002270 dispersing agent Substances 0.000 claims abstract description 33
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 32
- 239000004945 silicone rubber Substances 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000007822 coupling agent Substances 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 60
- 239000002245 particle Substances 0.000 claims description 27
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 24
- -1 methyl phenyl vinyl Chemical group 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 13
- 238000004132 cross linking Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 12
- 238000010992 reflux Methods 0.000 claims description 12
- 239000011265 semifinished product Substances 0.000 claims description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 11
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims description 11
- 229920002635 polyurethane Polymers 0.000 claims description 11
- 239000004814 polyurethane Substances 0.000 claims description 11
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 11
- XKLVLDXNZDIDKQ-UHFFFAOYSA-N butylhydrazine Chemical group CCCCNN XKLVLDXNZDIDKQ-UHFFFAOYSA-N 0.000 claims description 10
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 9
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 9
- 239000005543 nano-size silicon particle Substances 0.000 claims description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 9
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 9
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 8
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000004381 surface treatment Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000000967 suction filtration Methods 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 5
- SEKZHGKCVMOJSY-UHFFFAOYSA-N [dimethoxy(propyl)silyl]oxymethyl 2-methylprop-2-enoate Chemical compound CCC[Si](OC)(OC)OCOC(=O)C(C)=C SEKZHGKCVMOJSY-UHFFFAOYSA-N 0.000 claims description 5
- 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 claims description 5
- CWAFVXWRGIEBPL-UHFFFAOYSA-N ethoxysilane Chemical compound CCO[SiH3] CWAFVXWRGIEBPL-UHFFFAOYSA-N 0.000 claims description 5
- 229940083037 simethicone Drugs 0.000 claims description 5
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 4
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 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
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 claims description 4
- QOHMWDJIBGVPIF-UHFFFAOYSA-N n',n'-diethylpropane-1,3-diamine Chemical compound CCN(CC)CCCN QOHMWDJIBGVPIF-UHFFFAOYSA-N 0.000 claims description 4
- ZETYUTMSJWMKNQ-UHFFFAOYSA-N n,n',n'-trimethylhexane-1,6-diamine Chemical compound CNCCCCCCN(C)C ZETYUTMSJWMKNQ-UHFFFAOYSA-N 0.000 claims description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 4
- 229920002554 vinyl polymer Polymers 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 22
- 230000015556 catabolic process Effects 0.000 abstract description 10
- 239000000243 solution Substances 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 230000001965 increasing effect Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- 229920002545 silicone oil Polymers 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 125000003158 alcohol group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 208000032953 Device battery issue Diseases 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 125000000524 functional group Chemical group 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
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- LCGKKGWUTHIXIT-UHFFFAOYSA-N prop-1-ene triethoxysilane Chemical compound C=CC.C(C)O[SiH](OCC)OCC LCGKKGWUTHIXIT-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 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
- 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
- C08K3/28—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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
-
- 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
- C08K2201/011—Nanostructured additives
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- 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)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The application relates to the field of lithium battery heat dissipation materials, in particular to graphite heat conduction silica gel for heat dissipation of a lithium battery of a new energy automobile and a preparation method of the graphite heat conduction silica gel. The graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile comprises the following raw materials in parts by mass: 60-70 parts of raw silicone rubber, 13-18 parts of filler, 8-10 parts of graphene, 18-22 parts of modified graphite, 2-4 parts of dispersing agent, 0.5-1 part of coupling agent and 0.3-0.8 part of curing agent. The heat conduction performance of the graphite heat conduction silica gel is effectively improved through the addition of the modified graphene and the modified graphite, so that the graphite heat conduction silica gel has high heat conduction coefficient, excellent insulating property, high breakdown voltage and certain mechanical elasticity, can meet the heat dissipation requirement of a lithium battery of a new energy automobile, and has high safety and reliability.
Description
Technical Field
The application relates to the field of lithium battery heat dissipation materials, in particular to graphite heat conduction silica gel for heat dissipation of a lithium battery of a new energy automobile and a preparation method of the graphite heat conduction silica gel.
Background
The new energy automobile is an automobile which adopts unconventional automobile fuel as a power source (or adopts conventional automobile fuel and a novel automobile-mounted power device) and integrates the advanced technology in the aspects of power control and driving of the automobile, and the formed technical principle is advanced, and the automobile has a new technology and a new structure. The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile, other new energy automobiles and the like. The pure electric automobile is an automobile which adopts a single storage battery as an energy storage power source, the storage battery is used as the energy storage power source, the electric energy is provided for the motor through the battery, and the motor is driven to run, so that the automobile is driven to run, and most of new energy automobiles at present are all referred to as pure electric automobiles.
The lithium ion battery as the power core of the new energy automobile forms an automobile battery pack in a parallel connection and serial connection direction, and a high-temperature environment is easy to form due to a dense assembly mode among batteries, so that certain influence is caused on the performance and the state of charge of the battery, and the control failure of the power system of the new energy automobile can be caused seriously.
At present, a heat conduction silica gel sheet is added between the battery packs and a heat dissipation aluminum plate at the bottom of the battery, and the side face of the battery pack dissipates heat through air, so that not only can the good heat conduction work be achieved, but also a good isolation and damping effect can be formed between the battery packs, and the short circuit and abrasion phenomena caused by friction and vibration between the batteries can be effectively avoided. However, the current heat conduction silica gel has poor heat conduction effect and needs to be solved.
Disclosure of Invention
The application aims at overcoming the defects of the prior art and providing the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile and the preparation method thereof.
In a first aspect, the application provides a new energy automobile lithium cell heat dissipation is with graphite heat conduction silica gel, adopts following technical scheme:
the graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile comprises the following raw materials in parts by mass: 60-70 parts of raw silicone rubber, 13-18 parts of filler, 8-10 parts of graphene, 18-22 parts of modified graphite, 2-4 parts of dispersing agent, 0.5-1 part of coupling agent and 0.3-0.8 part of curing agent, wherein the filler comprises 5-7 parts of nano aluminum nitride, 35-55 nm of particle size, 4-7 parts of nano boron nitride, 75-85 nm of particle size, 2-9 parts of nano silicon carbide and 50-80 nm of particle size.
Through adopting above-mentioned technical scheme, in the new energy automobile lithium cell heat dissipation of this application with graphite heat conduction silica gel, the effect and the synergism of each component are as follows: raw silicone rubber: as a silica gel matrix, the protective property of the colloid is provided, and the flexibility and elasticity of the material are increased, so that the material has certain mechanical elastic property. And (3) filling: the filler is used for increasing the consistency and strengthening the mechanical strength of the graphite heat-conducting silica gel. Nano aluminum nitride, nano boron nitride and nano silicon carbide are common fillers. The particle sizes of the nano aluminum nitride and the nano boron nitride are smaller, larger surface area is provided, the contact area between the material and other components can be increased, and the heat conduction performance is improved. The nano silicon carbide plays a role in increasing the heat conduction property of the material in the filler. Graphene: graphene, as a material with excellent heat conduction performance, can improve the heat conduction coefficient of the whole graphite heat conduction silica gel. The addition of the graphene can increase the heat conduction path of the material, improve the heat conduction performance and improve the heat dissipation effect of the material. Modified graphite: the modified graphite can increase the heat conduction performance and stability of the graphite heat conduction silica gel. The modified graphite generally has higher heat conductivity and better heat stability, can effectively improve the heat dissipation effect, and keeps the heat conduction performance of the material. Dispersing agent: the dispersing agent has the function of uniformly dispersing various raw materials in the silica gel matrix, ensuring effective contact among the components and improving the overall heat conduction performance of the material. Coupling agent: the coupling agent has the function of forming chemical bonds between the filler and the silica gel matrix, increasing the adhesion between the filler and the matrix and improving the mechanical strength and the thermal conductivity of the material. Curing agent: the curing agent has the function of enabling the graphite heat-conducting silica gel to form a stable chemical structure in the curing process, and increasing the insulating property, breakdown voltage and mechanical strength of the material. Through the effects and synergistic effect of the components, the graphite heat-conducting silica gel has good heat-conducting property and heat-conducting coefficient, has excellent insulating property, high breakdown voltage and proper mechanical elasticity, and can meet the requirements of heat dissipation and use of the lithium battery of the new energy automobile.
Preferably, the graphene is modified graphene, and the preparation method thereof comprises the following steps:
s21: heating the graphene oxide solution with the concentration of 4g/L to 55-60 ℃;
s22: slowly adding tertiary butyl hydrazine into the graphene oxide solution, and reacting for 20-23 hours under the water bath condition of 70-75 ℃;
s23: after the reaction is finished, carrying out centrifugal separation on the obtained solution, washing the solution to be neutral, and finally carrying out vacuum drying at the temperature of-5 ℃ for 60 hours to obtain graphene powder;
s24, mixing 10-15g of silane coupling agent, 40-50g of ethanol and 200-400g of water, slowly adding 100g of graphene powder, fully stirring, heating to 80 ℃, refluxing for 120min, and separating and drying the treated modified graphene for later use.
Preferably, the mass ratio of the graphene oxide to the tertiary butyl hydrazine is 1:10-15, and the silane coupling agent is one or more of vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri (beta-methoxyethoxy) silane and gamma-methacryloxypropyl trimethoxysilane.
By adopting the technical scheme, in the application, the graphene oxide reacts with the tertiary butyl hydrazine to generate modified graphene which is used as one of the fillers of the graphite heat-conducting silica gel material. The graphene oxide reacts with tertiary butyl hydrazine under the heating condition, so that hydroxyl groups on the surface of the graphene oxide can be reduced to generate alcohol groups, the hydrophilicity of the graphene oxide is reduced, and organic groups are introduced, so that the dispersibility and compatibility of the modified graphene in a silane coupling agent are improved. The silane coupling agent is a functional compound that can form a chemical bond between an organic substance and an inorganic substance. In the application, the silane coupling agent has the function of chemically reacting with alcohol groups on the surface of the modified graphene to form silicon-oxygen-carbon bonds, so that the modified graphene is effectively connected with raw silicone rubber and other components, and the strength and stability of the material are improved. Different kinds of silane coupling agents play different roles in the modified graphene. The vinyl triethoxysilane and the vinyl trimethoxysilane can form stable bonds on the surface of the modified graphene, so that the adhesiveness and the dispersibility of the graphene and the raw silicone rubber are improved; vinyl tris (β -methoxyethoxy) silane can increase the interaction between the modified graphene and the raw silicone rubber through its β -methoxyethoxy group; the gamma-methacryloxypropyl trimethoxy silane forms a denser chemical bond structure on the surface of the modified graphene, so that the dispersibility and stability of the modified graphene in the graphite heat-conducting silica gel are improved. In graphite heat conduction silica gel, the existence of graphene and modified graphite can improve the heat conduction performance of the material and increase the heat dissipation effect. The addition of the fillers such as nano aluminum nitride, nano boron nitride, nano silicon carbide and the like can increase the heat conducting property of the material and improve the strength and the compression resistance of the material. The use of dispersants and coupling agents can improve the dispersibility of the filler and compatibility with the matrix, thereby increasing the stability and aging resistance of the material. The addition of the curing agent can lead the graphite heat-conducting silica gel to form a firm network structure, thereby improving the high temperature resistance of the material.
In conclusion, the selection and the proportion of various raw materials in the graphite heat-conducting silica gel can mutually promote, play a role together, fully play the heat conduction and enhancement roles of the graphene and the modified graphite, improve the heat conduction performance and the mechanical property of the graphite heat-conducting silica gel, and are suitable for heat dissipation of lithium batteries of new energy automobiles.
Preferably, the preparation method of the modified graphite comprises the following steps: mixing 10g of vinyltriethoxysilane, 60g of ethanol and 200-300g of water, slowly adding 200g of graphite powder, stirring thoroughly, heating to 70 ℃, refluxing for 100min, carrying out suction filtration, drying and crushing on the treated modified graphite, and then carrying out plasma surface treatment for 5s under the conditions of 1000W of power and 5% of oxygen volume concentration to obtain the modified graphite with the particle size of 2-8 mu m for later use.
By adopting the technical scheme, in the application, the modified graphite is one of main components in the graphite heat-conducting silica gel, and the preparation method can be realized by reacting with vinyl triethoxysilane. During the reaction, vinyltriethoxysilane acts as a coupling agent. It chemically reacts with carbon groups on the surface of graphite to form silicon-carbon bonds, effectively combining the modified graphite with other components. Thus, the dispersibility and compatibility of the modified graphite in the graphite heat-conducting silica gel and the adhesiveness with the silicon rubber can be improved. In the process of preparing the modified graphite, a plasma surface treatment method is also adopted. The plasma generates a large number of oxygen ions by exciting oxygen molecules and forms an active plasma gas. The plasma gas reacts with the surface of the modified graphite, and an oxidation functional group is introduced to increase the chemical activity of the surface of the modified graphite. This can improve the compatibility and dispersibility of the modified graphite with other components. The modified graphite prepared by the method has proper particle size, and can provide good filling effect in graphite heat-conducting silica gel. The addition of the modified graphite can increase the heat conduction performance of the graphite heat conduction silica gel, exert the reinforcing effect of the modified graphite in the material and improve the mechanical strength and the compression resistance of the material.
Preferably, the raw silicone rubber is one of methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber.
Preferably, the dispersing agent is a composition of polyurethane, polyvinyl alcohol, simethicone and methyltrimethoxysilane according to the mass ratio of 7:1-4:2-6:1-2.
By adopting the technical scheme, in the application, the dispersing agent is an important component in the graphite heat-conducting silica gel, and is formed by combining polyurethane, polyvinyl alcohol, dimethyl silicone oil and methyltrimethoxysilane according to a certain proportion. The surface energy of solid particles such as filler, graphene and the like can be reduced by adding the dispersing agent, and the dispersibility of the graphite heat-conducting silica gel to the filler is improved. Therefore, the filler can be more uniformly dispersed in the silica gel matrix, the aggregation and accumulation phenomena are avoided, and the heat conduction performance is improved. The polyurethane and the polyvinyl alcohol in the dispersing agent have good tackiness and adhesiveness, and can enhance the adhesive force between silica gel and components such as filler, modified graphite and the like. This increase in adhesion contributes to the mechanical and compressive strength of the silica gel. The methyltrimethoxysilane in the powder has higher surface activity, and can form a layer of coverage on the surface of the filler to change the property of the surface of the filler. Therefore, the compatibility between the filler and the silica gel can be improved, the adhesion between the filler and the silica gel is enhanced, and the insulating property and the high temperature resistance of the silica gel are further improved. The dimethyl silicone oil in the dispersing agent has good wettability, so that the silica gel can be in closer contact with components such as filler, modified graphite and the like. Thus being beneficial to improving the heat conduction efficiency and improving the heat conduction performance of the graphite heat conduction silica gel. Therefore, in graphite thermal conductive silica gel, the dispersant plays a role in enhancing filler dispersibility, binding mechanical strength between silica gel and filler, improving surface properties and wettability. Meanwhile, the synergistic effect of the dispersing agent and other components can further improve the heat conduction performance and the insulation performance of the graphite heat conduction silica gel, and the heat dissipation requirement of the lithium battery of the new energy automobile is met.
Preferably, the curing agent is one or more of trimethyl hexamethylenediamine, di-tert-butyl peroxide, vinyl triamine and diethylaminopropylamine.
Preferably, the coupling agent is one or more of gamma aminopropyl triethoxysilane, N (beta-aminoethyl) gamma aminopropyl trimethyl (ethoxysilane, gamma (methacryloyloxy) propyl trimethoxysilane and gamma diethylenetriamine propylene triethoxysilane.
In a second aspect, the application provides a preparation method of graphite heat conduction silica gel for heat dissipation of a lithium battery of a new energy automobile, which adopts the following technical scheme:
the preparation method of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile adopts the raw materials of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile, and comprises the following steps:
s91, uniformly mixing raw silicone rubber, filler, graphene, modified graphite, a coupling agent and a curing agent according to parts by weight, and stirring for 20-30min at a stirring speed of 300-400r/min to obtain a primary mixture;
s92, stirring the preliminary mixture at a high speed to obtain a semi-finished product, wherein the stirring temperature is 95-120 ℃, the stirring time is 30-40min, and the stirring speed is 3000-4000r/min;
s93, adding the dispersing agent into the semi-finished product, and uniformly stirring for 10-15min at a stirring speed of 300-400r/min;
s94, crosslinking and curing to obtain the graphite heat-conducting silica gel.
Preferably, in step S94, the crosslinking curing temperature is 130 ℃ to 170 ℃.
Through adopting above-mentioned technical scheme, the graphite heat conduction silica gel of this application has good heat conductivility, good insulating properties, high breakdown voltage and certain mechanical elasticity, can satisfy the heat dissipation demand of new energy automobile lithium cell to have certain security and reliability.
In summary, the beneficial technical effects of the present application are:
1. good heat conduction performance: the addition of the graphene and the modified graphite effectively improves the heat conduction performance of the graphite heat conduction silica gel, so that the graphite heat conduction silica gel has higher heat conduction coefficient. The heat dissipation efficiency of the lithium battery of the new energy automobile can be improved, and performance degradation or safety problems caused by overheating of the battery are avoided.
2. Excellent insulating properties: the graphite heat-conducting silica gel has good insulating property due to the addition of the raw silicone rubber and the action of the dispersing agent. This can prevent the occurrence of safety problems such as short circuit or leakage inside the battery, and improve the reliability of the battery.
3. High breakdown voltage: the addition of the silicon rubber of the graphite heat-conducting silica gel and the curing agent enables the graphite heat-conducting silica gel to have higher breakdown voltage. This may increase the resistance of the battery to electrical breakdown and reduce the risk of battery failure.
4. Certain mechanical elasticity: the addition of the raw silicone rubber of the graphite heat-conducting silica gel ensures that the raw silicone rubber has certain mechanical elasticity and is not easy to crush or crack. The battery structure integrity can be protected under the vibration or external impact of the battery, and the service life of the battery is prolonged.
Detailed Description
Embodiments of the present application will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only for illustration of the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
The graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile comprises the following raw materials in parts by mass: 60g of methyl vinyl silicone rubber, 13g of filler, 8g of graphene, 18g of modified graphite, 2g of dispersing agent, 0.5g of gamma aminopropyl triethoxysilane and 0.8g of trimethyl hexamethylenediamine, wherein the filler comprises 5g of nano aluminum nitride, 35-55 nm of particle size, 4g of nano boron nitride, 75-85 nm of particle size, 4g of nano silicon carbide and 50-80 nm of particle size, and the dispersing agent is a composition of polyurethane, polyvinyl alcohol, dimethyl silicone oil and methyl trimethoxysilane according to a mass ratio of 7:1:2:1.
The graphene is modified graphene, and the preparation method comprises the following steps:
s21: heating 10L of graphene oxide solution with the concentration of 4g/L to 55 ℃;
s22: slowly adding 400g of tertiary butyl hydrazine into the graphene oxide solution, and reacting for 20 hours under the water bath condition of 70 ℃;
s23: after the reaction is finished, carrying out centrifugal separation on the obtained solution, washing the solution to be neutral, and finally carrying out vacuum drying at the temperature of-5 ℃ for 60 hours to obtain graphene powder;
and S24, mixing 10g of vinyltriethoxysilane, 40g of ethanol and 200g of water, slowly adding 100g of graphene powder, fully stirring, heating to 80 ℃, refluxing for 120min, and separating and drying the treated modified graphene for later use.
The preparation method of the modified graphite comprises the following steps: mixing 10g of vinyltriethoxysilane, 60g of ethanol and 200g of water, slowly adding 200g of graphite powder, fully stirring, heating to 70 ℃, refluxing for 100min, carrying out suction filtration, drying and crushing on the treated modified graphite, and then carrying out plasma surface treatment for 5s under the conditions of 1000W of power and 5% of oxygen volume concentration to obtain the modified graphite with the particle size of 2-8 mu m for later use.
The preparation method of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile adopts the raw materials of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile, and comprises the following steps:
s91, uniformly mixing methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, filler, graphene, modified graphite, gamma-aminopropyl triethoxysilane and trimethyl hexamethylenediamine according to parts by weight, and stirring for 20min at a stirring speed of 300r/min to obtain a primary mixture;
s92, stirring the primary mixture at a high speed to obtain a semi-finished product, wherein the stirring temperature is 95 ℃, the stirring time is 30min, and the stirring speed is 3000r/min;
s93, adding the dispersing agent into the semi-finished product, and uniformly stirring for 10min at the stirring speed of 300r/min;
s94, crosslinking and curing, wherein the crosslinking and curing temperature is 130 ℃, and the graphite heat-conducting silica gel is obtained.
Example 2
The graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile comprises the following raw materials in parts by mass: 70g of methyl phenyl vinyl silicone rubber, 18g of filler, 10g of graphene, 22g of modified graphite, 4g of dispersing agent, 1g of N (beta-aminoethyl) gamma-aminopropyl trimethyl (ethoxysilane and 0.8g of di-tert-butyl peroxide, wherein the filler comprises 7g of nano aluminum nitride, 35-55 nm of particle size, 4g of nano boron nitride, 75-85 nm of particle size, 8g of nano silicon carbide and 50-80 nm of particle size, and the dispersing agent is a composition of polyurethane, polyvinyl alcohol, dimethyl silicone oil and methyltrimethoxysilane according to a mass ratio of 7:4:6:2.
The graphene is modified graphene, and the preparation method comprises the following steps:
s21: heating 10L of graphene oxide solution with the concentration of 4g/L to 60 ℃;
s22: slowly adding 600g of tertiary butyl hydrazine into the graphene oxide solution, and reacting for 23 hours under the water bath condition of 75 ℃;
s23: after the reaction is finished, carrying out centrifugal separation on the obtained solution, washing the solution to be neutral, and finally carrying out vacuum drying at the temperature of-5 ℃ for 60 hours to obtain graphene powder;
and S24, mixing 15g of vinyl trimethoxy silane, 50g of ethanol and 400g of water, slowly adding 100g of graphene powder, fully stirring, heating to 80 ℃, refluxing for 120min, and separating and drying the treated modified graphene for later use.
The preparation method of the modified graphite comprises the following steps: mixing 10g of vinyltriethoxysilane, 60g of ethanol and 300g of water, slowly adding 200g of graphite powder, fully stirring, heating to 70 ℃, refluxing for 100min, carrying out suction filtration, drying and crushing on the treated modified graphite, and then carrying out plasma surface treatment for 5s under the conditions of 1000W of power and 5% of oxygen volume concentration to obtain the modified graphite with the particle size of 2-8 mu m for later use.
The preparation method of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile adopts the raw materials of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile, and comprises the following steps:
s91, uniformly mixing methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, filler, graphene, modified graphite, N (beta-aminoethyl) gamma-aminopropyl trimethyl (ethoxysilane and di-tert-butyl peroxide according to parts by weight, and stirring for 30min at a stirring speed of 400r/min to obtain a preliminary mixture;
s92, stirring the primary mixture at a high speed to obtain a semi-finished product, wherein the stirring temperature is 120 ℃, the stirring time is 40min, and the stirring speed is 4000r/min;
s93, adding the dispersing agent into the semi-finished product, and uniformly stirring for 15min at a stirring speed of 400r/min;
s94, crosslinking and curing, wherein the crosslinking and curing temperature is 170 ℃, and the graphite heat-conducting silica gel is obtained.
Example 3
The graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile comprises the following raw materials in parts by mass: 65g of methyl vinyl silicone rubber, 16g of filler, 9g of graphene, 20g of modified graphite, 3g of dispersing agent, 0.8g of gamma (methacryloyloxy) propyl trimethoxysilane and 0.5g of vinyl triamine, wherein the filler comprises 6g of nano aluminum nitride, 35-55 nm of particle size, 5g of nano boron nitride, 75-85 nm of particle size, 5g of nano silicon carbide and 50-80 nm of particle size, and the dispersing agent is a composition of polyurethane, polyvinyl alcohol, dimethyl silicone oil and methyl trimethoxysilane according to a mass ratio of 7:2:4:1.5.
The graphene is modified graphene, and the preparation method comprises the following steps:
s21: heating 10L of graphene oxide solution with the concentration of 4g/L to 58 ℃;
s22: slowly adding 500g of tertiary butyl hydrazine into the graphene oxide solution, and reacting for 22 hours under the water bath condition of 73 ℃;
s23: after the reaction is finished, carrying out centrifugal separation on the obtained solution, washing the solution to be neutral, and finally carrying out vacuum drying at the temperature of-5 ℃ for 60 hours to obtain graphene powder;
s24, mixing 13g of vinyl tri (beta-methoxyethoxy) silane, 45g of ethanol and 300g of water, slowly adding 100g of graphene powder, fully stirring, heating to 80 ℃, refluxing for 120min, and separating and drying the treated modified graphene for later use.
The preparation method of the modified graphite comprises the following steps: mixing 10g of vinyltriethoxysilane, 60g of ethanol and 250g of water, slowly adding 200g of graphite powder, fully stirring, heating to 70 ℃, refluxing for 100min, carrying out suction filtration, drying and crushing on the treated modified graphite, and then carrying out plasma surface treatment for 5s under the conditions of 1000W of power and 5% of oxygen volume concentration to obtain the modified graphite with the particle size of 2-8 mu m for later use.
The preparation method of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile adopts the raw materials of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile, and comprises the following steps:
s91, uniformly mixing methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, filler, graphene, modified graphite, gamma (methacryloyloxy) propyl trimethoxysilane and vinyl triamine according to parts by weight, and stirring for 25min at a stirring speed of 350r/min to obtain a primary mixture;
s92, stirring the primary mixture at a high speed to obtain a semi-finished product, wherein the stirring temperature is 110 ℃, the stirring time is 35min, and the stirring speed is 3500r/min;
s93, adding the dispersing agent into the semi-finished product, and uniformly stirring for 12min at the stirring speed of 350r/min;
s94, crosslinking and curing, wherein the crosslinking and curing temperature is 150 ℃, and the graphite heat-conducting silica gel is obtained.
Example 4
The graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile comprises the following raw materials in parts by mass: 65g of methyl phenyl vinyl silicone rubber, 15g of filler, 9g of graphene, 20g of modified graphite, 3g of dispersing agent, 0.8g of gamma diethylenetriamine propylene triethoxysilane and 0.5g of diethylaminopropylamine, wherein the filler comprises 5g of nano aluminum nitride, 35-55 nm of particle size, 4-g of nano boron nitride, 75-85 nm of particle size, 9g of nano silicon carbide and 50-80 nm of particle size, and the dispersing agent is a composition of polyurethane, polyvinyl alcohol, dimethyl silicone oil and methyltrimethoxysilane according to a mass ratio of 7:3:4:1.5.
The graphene is modified graphene, and the preparation method comprises the following steps:
s21: heating 10L of graphene oxide solution with the concentration of 4g/L to 58 ℃;
s22: slowly adding 500g of tertiary butyl hydrazine into the graphene oxide solution, and reacting for 22 hours under the water bath condition of 73 ℃;
s23: after the reaction is finished, carrying out centrifugal separation on the obtained solution, washing the solution to be neutral, and finally carrying out vacuum drying at the temperature of-5 ℃ for 60 hours to obtain graphene powder;
s24, mixing 13g of gamma-methacryloxypropyl trimethoxy silane, 45g of ethanol and 300g of water, slowly adding 100g of graphene powder, fully stirring, heating to 80 ℃, refluxing for 120min, and separating and drying the treated modified graphene for later use.
The preparation method of the modified graphite comprises the following steps: mixing 10g of vinyltriethoxysilane, 60g of ethanol and 250g of water, slowly adding 200g of graphite powder, fully stirring, heating to 70 ℃, refluxing for 100min, carrying out suction filtration, drying and crushing on the treated modified graphite, and then carrying out plasma surface treatment for 5s under the conditions of 1000W of power and 5% of oxygen volume concentration to obtain the modified graphite with the particle size of 2-8 mu m for later use.
The preparation method of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile adopts the raw materials of the graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile, and comprises the following steps:
s91, uniformly mixing methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, filler, graphene, modified graphite, gamma-diethylenetriamine propylene triethoxysilane and diethylaminopropylamine according to parts by weight, and stirring for 25min at a stirring speed of 350r/min to obtain a primary mixture;
s92, stirring the primary mixture at a high speed to obtain a semi-finished product, wherein the stirring temperature is 110 ℃, the stirring time is 35min, and the stirring speed is 3500r/min;
s93, adding the dispersing agent into the semi-finished product, and uniformly stirring for 13min at the stirring speed of 350r/min;
s94, crosslinking and curing, wherein the crosslinking and curing temperature is 160 ℃, and the graphite heat-conducting silica gel is obtained.
Example 5
The same as in example 4, except that 0.2g of gamma aminopropyl triethoxysilane, 0.2g of N (. Beta. -aminoethyl) gamma aminopropyl trimethyl (ethoxysilane, 0.2g of gamma (methacryloyloxy) propyl trimethoxysilane, and 0.2g of gamma diethylenetriamine propylene triethoxysilane were used in place of 0.8g of gamma diethylenetriamine propylene triethoxysilane.
Comparative example 1
The same as in example 5, except that the dispersant was 3g of polyurethane.
Comparative example 2
The same as in example 5, except that the dispersant was polyvinyl alcohol 3g.
Comparative example 3
The same as in example 5, except that the dispersant was 3g of simethicone.
Comparative example 4
The same as in example 5, except that the dispersant was methyltrimethoxysilane in an amount of 3g.
Comparative example 5
The same as in example 4, except that 9g of conventional graphene was used instead of 9g of graphene prepared in the present application.
Comparative example 6
The same as in example 4, except that 9g of filler was used instead of 9g of graphene prepared in the present application.
Comparative example 7
The same as in example 4, except that 20g of conventional graphite was used instead of 20g of the modified graphite prepared in the present application.
Comparative example 8
The same as in example 4, except that 20g of filler was used instead of 20g of modified graphite prepared in the present application.
Performance testing
The graphite thermal conductive silica gel of example 15 and comparative examples 1 to 8 was subjected to performance test, and the results are shown in table 1.
Thermal conductivity was measured with reference to ASTM D5470, sample size 31mm by 31mm, thickness 2mm, upper die plate temperature 80℃and pressure 10psi.
Dielectric breakdown voltage was measured with reference to ASTM D149, sample diameter 100mm, thickness 2mm, and voltage increase rate 500V/s.
Volume resistivity was measured with reference to ASTM D257, specimen diameter 100mm, modulation voltage 500V.
The hardness is tested with reference to ASTM D2240, with a sample thickness of at least 6mm (which may be superimposed), and the contact location of the press pin and the sample is at least 12mm from the edge.
Compression set is tested with reference to ASTM D395 (method B), 30% compression, 70 ℃ for 22 hours.
TABLE 1
As can be seen from Table 1, the graphite heat-conducting silica gel prepared in examples 1-5 has good heat conductivity, heat conductivity coefficient not less than 7.32W/(mk), excellent insulating property, breakdown voltage not less than 25.3kV, certain mechanical elasticity, and difficult crushing and fracturing, and can meet the requirement of heat dissipation of lithium batteries of new energy automobiles.
As can be seen from Table 1, the graphite thermal conductive silica gel prepared in example 5 and comparative examples 1-4 has better performance than graphite thermal conductive silica gel prepared by using polyurethane, polyvinyl alcohol, simethicone and methyltrimethoxysilane alone, wherein the composition comprises polyurethane, polyvinyl alcohol, simethicone and methyltrimethoxysilane in a mass ratio of 7:3:4:1.5.
As can be seen from Table 1, the graphite thermal conductive silica gel prepared in example 5 and comparative examples 5-6 has good performance in comparison analysis of performance.
As can be seen from Table 1, the graphite thermal conductive silica gel prepared in example 5 and comparative examples 7-8 has good performance in comparison analysis of the performance of the graphite thermal conductive silica gel added with the modified graphite prepared in the application.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the above embodiments specifically illustrate the present invention, it should be understood by those skilled in the art that modifications and equivalents may be made to the specific embodiments of the present invention without departing from the spirit and scope of the present invention, and any modifications and equivalents are intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. The graphite heat conduction silica gel for heat dissipation of the lithium battery of the new energy automobile is characterized by comprising the following raw materials in parts by weight: 60-70 parts of raw silicone rubber, 13-18 parts of filler, 8-10 parts of graphene, 18-22 parts of modified graphite, 2-4 parts of dispersing agent, 0.5-1 part of coupling agent and 0.3-0.8 part of curing agent, wherein the filler comprises 5-7 parts of nano aluminum nitride, 35-55 nm of particle size, 4-7 parts of nano boron nitride, 75-85 nm of particle size, 2-9 parts of nano silicon carbide and 50-80 nm of particle size.
2. The graphite heat conduction silica gel for heat dissipation of a lithium battery of a new energy automobile as claimed in claim 1, wherein the graphene is modified graphene, and the preparation method comprises the following steps:
s21: heating the graphene oxide solution with the concentration of 4g/L to 5560 ℃;
s22: slowly adding tertiary butyl hydrazine into the graphene oxide solution, and reacting for 2023 hours under the water bath condition of 7075 ℃;
s23: after the reaction is finished, carrying out centrifugal separation on the obtained solution, washing the solution to be neutral, and finally carrying out vacuum drying at a temperature of 5 ℃ for 60 hours to obtain graphene powder;
s24, mixing 10-15g of silane coupling agent, 40-50g of ethanol and 200-400g of water, slowly adding 100g of graphene powder, fully stirring, heating to 80 ℃, refluxing for 120min, and separating and drying the treated modified graphene for later use.
3. The graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile according to claim 2, wherein the mass ratio of the graphene oxide to the tertiary butyl hydrazine is 1:10-15, and the silane coupling agent is one or more of vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri (beta-methoxyethoxy) silane and gamma-methacryloxypropyl trimethoxysilane.
4. The graphite heat conduction silica gel for heat dissipation of a lithium battery of a new energy automobile according to claim 1, wherein the preparation method of the modified graphite is as follows: mixing 10g of vinyltriethoxysilane, 60g of ethanol and 200-300g of water, slowly adding 200g of graphite powder, stirring thoroughly, heating to 70 ℃, refluxing for 100min, carrying out suction filtration, drying and crushing on the treated modified graphite, and then carrying out plasma surface treatment for 5s under the conditions of 1000W of power and 5% of oxygen volume concentration to obtain the modified graphite with the particle size of 2-8 mu m for later use.
5. The graphite heat-conducting silica gel for heat dissipation of lithium batteries of new energy vehicles according to claim 1, wherein the raw silicone rubber is one of methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber.
6. The graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile according to claim 1, wherein the dispersing agent is a composition of polyurethane, polyvinyl alcohol, simethicone and methyltrimethoxysilane according to a mass ratio of 7:1-4:2-6:1-2.
7. The graphite heat-conducting silica gel for heat dissipation of a lithium battery of a new energy automobile according to claim 1, wherein the curing agent is one or more of trimethyl-hexamethylenediamine, di-tert-butyl peroxide, vinyl triamine and diethylaminopropylamine.
8. The graphite heat-conducting silica gel for heat dissipation of lithium batteries of new energy automobiles according to claim 1, wherein the coupling agent is one or more of gamma aminopropyl triethoxysilane, N (beta-aminoethyl) gamma aminopropyl trimethyl (ethoxysilane, gamma (methacryloyloxy) propyl trimethoxysilane and gamma diethylenetriamine propylene triethoxysilane.
9. The preparation method of the graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile is characterized by adopting the raw materials of the graphite heat-conducting silica gel for heat dissipation of the lithium battery of the new energy automobile as claimed in any one of claims 1 to 8, and comprises the following steps:
s91, uniformly mixing raw silicone rubber, filler, graphene, modified graphite, a coupling agent and a curing agent according to parts by weight, and stirring for 20-30min at a stirring speed of 300 400r/min to obtain a primary mixture;
s92, stirring the primary mixture at a high speed to obtain a semi-finished product, wherein the stirring temperature is 95120 ℃, the stirring time is 30-40min, and the stirring speed is 3000-4000r/min;
s93, adding the dispersing agent into the semi-finished product, and uniformly stirring for 10-15min at a stirring speed of 300-400r/min;
s94, crosslinking and curing to obtain the graphite heat-conducting silica gel.
10. The method for preparing graphite heat-conducting silica gel for heat dissipation of lithium battery of new energy automobile as claimed in claim 9, wherein in step S94, the cross-linking curing temperature is 130-170 ℃.
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| JP2012171986A (en) * | 2011-02-17 | 2012-09-10 | Teijin Ltd | Thermally conductive composition |
| CN109294236A (en) * | 2018-08-21 | 2019-02-01 | 广州特种承压设备检测研究院 | A kind of preparation method of the graphene-based heat conductive silica gel of high dispersive |
| CN115584129A (en) * | 2022-09-21 | 2023-01-10 | 深圳市欧普特工业材料有限公司 | Heat-conducting silica gel sheet and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012171986A (en) * | 2011-02-17 | 2012-09-10 | Teijin Ltd | Thermally conductive composition |
| CN109294236A (en) * | 2018-08-21 | 2019-02-01 | 广州特种承压设备检测研究院 | A kind of preparation method of the graphene-based heat conductive silica gel of high dispersive |
| CN115584129A (en) * | 2022-09-21 | 2023-01-10 | 深圳市欧普特工业材料有限公司 | Heat-conducting silica gel sheet and preparation method thereof |
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Denomination of invention: A graphite thermal conductive silicone gel for heat dissipation of lithium batteries in new energy vehicles and its preparation method Granted publication date: 20240412 Pledgee: Zhuhai China Resources Bank Co.,Ltd. Dongguan Branch Pledgor: DONGGUAN HONGYI THERMAL CONDUCTMTY MATERIAL Co.,Ltd. Registration number: Y2024980034895 |