CN116102947A - Insulating heat dissipation coating and preparation method thereof - Google Patents
Insulating heat dissipation coating and preparation method thereof Download PDFInfo
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- CN116102947A CN116102947A CN202211100116.3A CN202211100116A CN116102947A CN 116102947 A CN116102947 A CN 116102947A CN 202211100116 A CN202211100116 A CN 202211100116A CN 116102947 A CN116102947 A CN 116102947A
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- heat dissipation
- insulating heat
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 71
- 238000000576 coating method Methods 0.000 title claims abstract description 49
- 239000011248 coating agent Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000011347 resin Substances 0.000 claims abstract description 70
- 229920005989 resin Polymers 0.000 claims abstract description 70
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 58
- 239000002245 particle Substances 0.000 claims abstract description 38
- 239000011159 matrix material Substances 0.000 claims abstract description 36
- 239000000203 mixture Substances 0.000 claims abstract description 32
- 238000000227 grinding Methods 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000001723 curing Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 239000000945 filler Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 15
- 239000012752 auxiliary agent Substances 0.000 claims description 14
- 229910021485 fumed silica Inorganic materials 0.000 claims description 13
- 239000002904 solvent Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000003973 paint Substances 0.000 claims description 12
- 239000002518 antifoaming agent Substances 0.000 claims description 11
- 239000002270 dispersing agent Substances 0.000 claims description 11
- 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
- 150000001412 amines Chemical class 0.000 claims description 7
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 claims description 6
- 239000003085 diluting agent Substances 0.000 claims description 6
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 229960002887 deanol Drugs 0.000 claims description 3
- 239000012972 dimethylethanolamine Substances 0.000 claims description 3
- 229910021389 graphene Inorganic materials 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 2
- 239000004925 Acrylic resin Substances 0.000 claims description 2
- 229920000178 Acrylic resin Polymers 0.000 claims description 2
- 229910052582 BN Inorganic materials 0.000 claims description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 claims description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 2
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 2
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- -1 magnesium nitride Chemical class 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 229920001225 polyester resin Polymers 0.000 claims description 2
- 239000004645 polyester resin Substances 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- 239000011787 zinc oxide Substances 0.000 claims description 2
- 238000013007 heat curing Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 32
- 230000000694 effects Effects 0.000 description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 10
- 238000009413 insulation Methods 0.000 description 10
- 238000005507 spraying Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000007649 pad printing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- 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
- C08J2333/00—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 only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
-
- 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
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
-
- 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
Abstract
The invention discloses an insulating heat dissipation coating and a preparation method thereof, and belongs to the field of insulating heat dissipation coatings. The preparation method comprises the following steps: preparation of carbon mixture particles: grinding carbon, adding part of matrix resin after grinding, continuously grinding to obtain carbon mixture particles with the particle size not less than 800 meshes, and finally stirring the carbon mixture particles with other raw materials to obtain the insulating heat-dissipating coating. And (3) grinding the carbon, adding a small amount of resin, obtaining carbon mixture particles with stable specification and shape, finally dispersing the carbon mixture particles in matrix resin, and curing the coating in a heat curing mode after the use, so that the resin in the carbon mixture particles is connected with the matrix resin and cured, the dispersibility of the carbon mixture particles in the matrix resin is ensured, and then the coating with high heat dissipation and high insulativity is obtained.
Description
Technical Field
The invention relates to the technical field of composite coatings, in particular to an insulating heat dissipation coating and a preparation method thereof.
Background
With the rapid development of electronic technology, electronic devices are being miniaturized and miniaturized, and the integration level of the system is higher and higher. On a small-size material, be provided with a plurality of electrical components, when electronic equipment operates, its heat dissipation space diminishes, and simultaneously along with electronic equipment's high-speed operation, electrical components's heat generation increases sharply, and the heat dissipation space is narrow and small simultaneously, leads to heat to not give off in time, probably influences electronic equipment's working property and life.
Generally, heat dissipation means include heat conduction, heat radiation, and heat convection. Heat conduction is the way in which energy is transferred, either by the substance itself or when the substance is in contact with the substance, and is the most common way of heat transfer, and is the way of heat dissipation that is currently best. However, at present, an air cooling method is generally adopted in the heat dissipation of electronic products, particularly a CPU, and the method belongs to heat convection, has low cooling efficiency, can generate noise by a fan and has the defect of easy damage; a semiconductor refrigeration sheet method is adopted, and the method belongs to heat conduction, but has the defects of low refrigeration efficiency, immature process, high price characteristic and the like; and heat-conducting silica gel and the like are used for heat dissipation, but the effect is not ideal. The above can only be made into a single characteristic, but cannot be insulated. The electronic and electric market requires insulation in addition to heat dissipation-!
Therefore, the inventor of the present invention intends to develop an insulating heat dissipation coating and a preparation method thereof based on the principle of radiation heat dissipation.
Disclosure of Invention
In order to solve the technical problems, the invention provides an insulating heat dissipation coating and a preparation method thereof.
The technical scheme of the invention is as follows: the material comprises the following raw materials in parts by weight: 50-150 parts of matrix resin, 10-30 parts of carbon, 0.1-15 parts of silane coupling agent, 30-90 parts of insulating heat dissipation filler, 1-15 parts of fumed silica, 15-100 parts of solvent and 3-5 parts of auxiliary agent;
and the preparation method comprises the following steps:
treatment of matrix resin: adding resin diluent and solvent into matrix resin, stirring for 10-20min with a stirrer of 3000-5000r/min, adding amine neutralizer to neutralize to pH 7-8, and obtaining matrix resin pretreatment; for example, the amine neutralizer may be at least one of an amine neutralizer for an aqueous coating system of the courtesy DMAE and a multifunctional auxiliary agent aqueous coating amp95 (amine neutralizer) coating pH adjustor.
Addition of auxiliary agent: adding an auxiliary agent, fumed silica, a silane coupling agent and an insulating heat dissipation filler into the matrix resin pretreatment, and stirring for 10-20min at 3000-5000r/min to obtain a matrix resin mixture;
preparation of carbon mixture particles: grinding carbon, adding matrix resin accounting for 5-10% of the total weight of the carbon into the carbon after grinding for 10-20min to obtain carbon mixture particles with the particle size not less than 800 meshes (namely finer particles);
preparation of insulating heat dissipation paint: and adding the prepared carbon mixture particles into the matrix resin mixture, and stirring for 10-20min at the condition of 3000-5000r/min to obtain the insulating heat-dissipating coating.
Further, the carbon mixture particles are spherical and are ground by a sand mill, and the particle diameter after grinding is not more than 5 μm.
Further, the matrix resin is at least one of hydrophilic epoxy resin, hydrophilic polyester resin and hydrophilic acrylic resin, and has a weight average molecular weight of 3000-6000. It is required that the matrix resin contains hydroxyl groups and/or carboxyl groups.
Further, the carbon is at least one of insulating carbon black, graphene oxide and graphite oxide sheets. The particles become granules after grinding, and grinding is continued after a small amount of resin is added to obtain spherical small-sized particles.
Further, the silane coupling agent is at least one of vinyl triethoxysilane, vinyl trimethoxysilane and vinyl tri (beta-methoxyethoxy) silane.
Further, the particle size of the insulating heat dissipation filler is 5-20 mu m, and the insulating heat dissipation filler is at least one of boron nitride, aluminum oxide, aluminum nitride, magnesium nitride, zinc oxide, silicon carbide and titanium dioxide. Through the setting of insulating heat dissipation filler, can play the effect of reinforcing insulativity and assurance radiation radiating efficiency.
Further, the solvent is deionized water, the auxiliary agent comprises a leveling agent, a curing agent, a defoaming agent and a dispersing agent, and the total dosage of the auxiliary agent is 3-5 parts.
Further, the resin diluent is at least one of deionized water, diacetone alcohol (DAA) and ethylene glycol butyl ether (BCS), absolute ethyl alcohol and Dimethylethanolamine (DMEA), and the dosage is 5-25% of the weight of the resin.
The preparation method of the insulating heat dissipation coating has the beneficial technical effects that: when carbon is mixed with a very small amount of matrix resin, the carbon particles are provided with resin and are spherical particles, when the carbon is dispersed in the whole resin system, the contact surface between the carbon and the carbon is only one point, meanwhile, the resin in the particles and the resin system can be jointly solidified when being solidified, and finally a uniform dispersion system is formed, and when the carbon is added into the matrix resin added by viscosity reduction and auxiliary agents, the carbon mixture particles are uniformly dispersed by stirring, so that a uniform insulating heat dissipation coating is obtained; when the insulating heat dissipation coating is used, the insulating heat dissipation coating is subjected to pad printing, screen printing and spraying on a product, and is cured in a heat curing mode, and the resin of the carbon mixture particles and the matrix resin are cured together, so that carbon in the finally formed insulating heat dissipation coating is uniformly dispersed in the coating, the heat conduction, radiation and heat dissipation performances between carbon are ensured, the insulating performance between carbon and carbon is also ensured, and the coating with excellent insulativity and heat dissipation performance is obtained.
The insulating heat dissipation coating can achieve good insulating effect and has excellent heat dissipation performance.
Detailed Description
In order that the manner in which the above recited features of the present invention are attained and can be understood in detail, a more particular description of the invention, briefly summarized below, may be had by reference to specific embodiments thereof which are illustrated in the appended drawings.
First, a sample is prepared.
Sample 1
The formula comprises the following components: 80 parts of resin, 20 parts of carbon, 5 parts of silane coupling agent, 5 parts of fumed silica, 30 parts of solvent, 60 parts of insulating heat dissipation filler (silicon carbide is selected), 80 parts of water, and 1 part of each of flatting agent, curing agent, defoaming agent and dispersing agent;
the steps are as follows:
preparation of carbon mixture particles: 20 parts of carbon is ground in a sand mill to obtain carbon powder with the particle size not exceeding 1 mu m, 0.5 part of resin is added, and grinding is continued to obtain carbon mixture particles with the particle size of 800 meshes.
Treatment of matrix resin: adding resin diluent accounting for 15% of the residual matrix resin and 80 parts of water into the residual matrix resin, stirring for 10-20min by using a stirrer with the speed of 3000-5000r/min, and adding amine neutralizer for neutralization until the pH value is 7-8 to obtain a matrix resin pretreatment;
addition of auxiliary agent: adding a leveling agent, a curing agent, a defoaming agent, a dispersing agent, fumed silica, a silane coupling agent and an insulating heat dissipation filler into the substrate resin pretreatment, and stirring for 10-20min under the condition of 3000-5000r/min to obtain a substrate resin mixture;
preparation of insulating heat dissipation paint: and adding the prepared carbon mixture particles into the matrix resin mixture, and stirring for 10-20min at the condition of 3000-5000r/min to obtain the insulating heat-dissipating coating.
Sample 2
The formula comprises the following components: 80 parts of resin, 20 parts of carbon, 5 parts of silane coupling agent, 5 parts of fumed silica, 30 parts of solvent, 60 parts of insulating heat dissipation filler (silicon carbide is selected), 80 parts of water, and 1 part of each of flatting agent, curing agent, defoaming agent and dispersing agent;
the steps are as follows:
1 part of resin was added in the preparation of the carbon mixture particles, and the rest of the procedure was the same as that of sample 1.
Sample 3
The formula comprises the following components: 80 parts of resin, 20 parts of carbon, 5 parts of silane coupling agent, 5 parts of fumed silica, 30 parts of solvent, 60 parts of insulating heat dissipation filler (silicon carbide is selected), 80 parts of water, and 1 part of each of flatting agent, curing agent, defoaming agent and dispersing agent;
the steps are as follows:
1.5 parts of resin was added in the preparation of the carbon mixture particles, and the rest of the procedure was the same as that of sample 1.
Sample 4
The formula comprises the following components: 80 parts of resin, 20 parts of carbon, 5 parts of silane coupling agent, 5 parts of fumed silica, 30 parts of solvent, 60 parts of insulating heat dissipation filler (silicon carbide is selected), 80 parts of water, and 1 part of each of flatting agent, curing agent, defoaming agent and dispersing agent;
the steps are as follows:
in the preparation of the carbon mixture particles, 2 parts of resin was added, and the rest of the procedure was the same as that of sample 1.
Sample 5
The formula comprises the following components: 80 parts of resin, 20 parts of carbon, 5 parts of silane coupling agent, 5 parts of fumed silica, 30 parts of solvent, 60 parts of insulating heat dissipation filler (silicon carbide is selected), 80 parts of water, and 1 part of each of flatting agent, curing agent, defoaming agent and dispersing agent;
the steps are as follows:
2.5 parts of resin was added in the preparation of the carbon mixture particles, and the rest of the procedure was the same as that of sample 1.
Sample 6
The formula comprises the following components: 80 parts of resin, 20 parts of carbon, 5 parts of silane coupling agent, 5 parts of fumed silica, 30 parts of solvent, 60 parts of insulating heat dissipation filler (silicon carbide is selected), 80 parts of water, and 1 part of each of flatting agent, curing agent, defoaming agent and dispersing agent;
the steps are as follows:
3 parts of resin was added in the preparation of the carbon mixture particles, and the rest of the procedure was the same as that of sample 1.
Sample 7
The formula comprises the following components: 80 parts of resin, 20 parts of carbon, 5 parts of silane coupling agent, 5 parts of fumed silica, 30 parts of solvent, 60 parts of insulating heat dissipation filler (silicon carbide is selected), 80 parts of water, and 1 part of each of flatting agent, curing agent, defoaming agent and dispersing agent;
the steps are as follows:
treatment of matrix resin: adding 15% of resin diluent and 80 parts of water into matrix resin, stirring for 10-20min by using a stirrer with the speed of 3000-5000r/min, and adding amine neutralizer to neutralize to pH of 7-8 to obtain a matrix resin pretreatment;
addition of auxiliary agent: adding a leveling agent, a curing agent, a defoaming agent, a dispersing agent, fumed silica, a silane coupling agent and an insulating heat dissipation filler into the substrate resin pretreatment, and stirring for 10-20min under the condition of 3000-5000r/min to obtain a substrate resin mixture;
preparation of insulating heat dissipation paint: adding carbon into the matrix resin mixture, and stirring for 10-20min at 3000-5000r/min to obtain the insulating heat dissipation coating.
Early preparation
A plurality of aluminum sheets of uniform size are prepared for spraying equipment and testing equipment.
Application method
The 7 samples are respectively coated on the surface of an aluminum sheet by conventional spraying, and are cured in a drying oven at 150 ℃ for 30min after the spraying is finished.
On 7 aluminum sheets, comparative examples 1 to 7 were obtained.
Meanwhile, a blank example is also arranged, and the surface of the aluminum sheet is not sprayed.
Preliminary test
The blank examples and comparative examples 1 to 6 were respectively subjected to insulation withstand voltage test to obtain insulation voltage and resistance values, and the data are shown in Table 1 below. The insulation voltage and the resistance value are that the sample is connected to a voltage-resistant test instrument, and the instrument displays data; and (3) constant temperature test: the dimensions of the simulated chip were 20 x 20mm, the test box was a 30 x 30cm closed box with an initial temperature of 120 degrees (degrees celsius abbreviation herein).
Table 1 shows the dielectric withstand voltage test tables of 1 blank example and 5 comparative examples
From the analysis of table 1, it is clear that 6 comparative examples sprayed with the insulating heat dissipation coating have both insulation voltage and resistance values greater than those of the blank examples, and the constant temperature is lower than that of the blank examples; comparison of comparative examples 1-6 shows that:
first, the comparative examples 1 to 6 were added in amounts of 2.5%, 5%, 7.5%, 10%, 12.5%, 15%, respectively, and when the amount was 7.5%, the insulating heat dissipation effect was the worst, and as the amount was increased, the insulating heat dissipation effect was increased, but when the amount was increased to 10% or more, the insulating heat dissipation effect began to decrease, possibly because the resin layer became thicker, resulting in deterioration of the heat dissipation effect; although comparative example 1 has a good heat dissipation effect, it has a small resistance and cannot exert an insulating effect.
Second, the insulating heat dissipation effect of comparative examples 2 to 4 is preferable, and thus the optimum addition ratio is 5 to 10%.
Third, comparative example 7 was not ground, and since carbon was not uniform in specification due to graphene and graphite flakes in addition to carbon powder, the insulating heat dissipation effect was greater than that of the blank example but less than that of comparative example 1.
Performance stability test
The method of using the insulating heat dissipation coating is shown in the preliminary test. Blank examples and 5 examples were set, and each of the 5 examples was spray coated and cured using sample 3.
Blank examples
An aluminum sheet, the surface of which is free of paint.
Example 1
An aluminum sheet was coated with an insulating heat-dissipating paint on one side and once, and the thickness of the film was 10. Mu.m.
Example 2
And an aluminum sheet, wherein insulating heat dissipation paint is sprayed on one side and two times, and the film thickness is 25-40 mu m.
Example 3
An aluminum sheet is sprayed with insulating heat dissipation paint on two sides and at one time, and the film thickness is 10-15 mu m.
Example 4
And an aluminum sheet, wherein insulating heat dissipation paint is sprayed on the two surfaces of the aluminum sheet twice, and the film thickness is 25-40 mu m.
Example 5
And an aluminum sheet, wherein insulating heat dissipation paint is sprayed on the two sides and three times, and the film thickness is 80-100 mu m.
Coating adhesion test
Examples 1-5 were tested using the hundred test method and rubbed 100 times with alcohol. Test results: the test passed.
Coating surface hardness test
Test standard: 15-20m 2 The surface hardness of each of examples 1 to 5 was 4H per kg, and the test was passed.
Constant temperature testing
The size of the simulation chip is 20mm by 20mm, the test box is a closed box body with 30cm by 30cm, and the initial temperature is 120 degrees.
Test results:
blank examples are 30min, the constant temperature is 81 ℃, and the temperature is returned to 5 ℃ for 60 min;
example 1 was run at a constant temperature of 65.4 degrees for 60 minutes at 30 minutes with a return temperature of 1-2 degrees;
example 2 was shown to have a constant temperature of 63.6 degrees for 60 minutes at 30 minutes with a return temperature of 1-2 degrees.
The test result shows that the insulating heat-dissipating coating can effectively reduce the temperature after being sprayed, and continuously reduces the temperature, and the heat-dissipating and temperature-reducing effects are excellent when the temperature is returned by 1-2 ℃ in one hour; moreover, the cooling effect of example 2 is slightly higher than that of example 1 by comparison with examples 1-2.
Insulation withstand voltage test
The following table 2 was obtained by performing the thickness measurement, insulation voltage and resistance value test on the double-sided coatings of examples 3 to 5, wherein "none" in table 2 indicates that the test data exceeded the measuring range of the meter, and the maximum measuring range of the meter was 999gΩ, i.e. "none" indicates that it exceeded 999gΩ. And the thickness has two values, which respectively refer to the thickness of the coating after spraying on two sides, and the two values are slightly different.
DC and AC voltage tests were performed on the double-sided coatings of examples 3-5 to give tables 3-5.
TABLE 2 resistance test Table of insulation voltages of examples 3 to 5
The thicknesses were the thicknesses of both sides, and the voltage resistance test meters were connected to examples 3 and 4, respectively, and the voltages were 2500V and 5000V, respectively, and example 3 did not pass, example 4 passed, and example 5 passed only 5000V.
Table 3 dc and ac voltage test meter of example 3
Table 4 dc and ac voltage test meter of example 4
Table 5 dc and ac voltage test meter of example 5
As can be seen from the tests conducted in examples 3 to 5
When the film thickness of the single-layer coating is 20-25 mu m, the insulation voltage is 1000V, and as the thickness of the coating increases, the test is continued, and the following finding is made: the thickness of the single-layer coating is 80 μm, and the insulation voltage is 2500-5000V.
The existing insulating paint can reach 1000V insulating voltage only when the thickness of the insulating paint is 100-200 mu m.
From the above, it is clear from comparison of blank examples and examples that the insulating heat dissipation coating of the present invention has stable physicochemical properties, and good dispersibility of carbon in resin, so that the whole coating system has good heat conduction performance and electrical insulation performance, and after long-term use, the heat dissipation performance of the coating is only 1-2 degrees after Wen Henxiao.
As can be seen from the analysis of Table 4, the test was excellent in withstand voltage test of 6000V DC and 5000V AC even at the time of 60 seconds test.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (9)
1. The preparation method of the insulating heat dissipation coating is characterized by comprising the following raw materials in parts by weight: 50-150 parts of matrix resin, 10-30 parts of carbon, 0.1-15 parts of silane coupling agent, 30-90 parts of insulating heat dissipation filler, 1-15 parts of fumed silica, 15-100 parts of solvent and 3-5 parts of auxiliary agent;
and the preparation method comprises the following steps:
treatment of matrix resin: adding resin diluent and solvent into matrix resin, stirring for 10-20min at 3000-5000r/min, adding amine neutralizer to neutralize to pH 7-8 to obtain matrix resin pretreatment;
addition of auxiliary agent: adding an auxiliary agent, fumed silica, a silane coupling agent and an insulating heat dissipation filler into the matrix resin pretreatment, and stirring for 10-20min at 3000-5000r/min to obtain a matrix resin mixture;
preparation of carbon mixture particles: grinding carbon, adding matrix resin accounting for 5-10% of the total weight of the carbon into the carbon after grinding, and grinding for 10-20min to obtain carbon mixture particles with the particle size not less than 800 meshes;
preparation of insulating heat dissipation paint: and adding the prepared carbon mixture particles into the matrix resin mixture, and stirring for 10-20min at the condition of 3000-5000r/min to obtain the insulating heat-dissipating coating.
2. The method for preparing the insulating heat dissipation coating according to claim 1, wherein: the carbon after grinding is spherical and is ground by a sand mill, and the particle size after grinding is not more than 5 mu m.
3. The method for preparing the insulating heat dissipation coating according to claim 1, wherein: the matrix resin is at least one of hydrophilic epoxy resin, hydrophilic polyester resin and hydrophilic acrylic resin, and has a weight average molecular weight of 3000-6000.
4. The method for preparing the insulating heat dissipation coating according to claim 1, wherein: the carbon is at least one of insulating carbon black, graphene oxide and graphite oxide sheets.
5. The method for preparing the insulating heat dissipation coating according to claim 1, wherein: the silane coupling agent is at least one of vinyl triethoxysilane, vinyl trimethoxysilane and vinyl tri (beta-methoxyethoxy) silane.
6. The method for preparing the insulating heat dissipation coating according to claim 1, wherein: the particle size of the insulating heat dissipation filler is 5-20 mu m, and the insulating heat dissipation filler is at least one of boron nitride, aluminum oxide, aluminum nitride, magnesium nitride, zinc oxide, silicon carbide and titanium dioxide.
7. The method for preparing the insulating heat dissipation coating according to claim 1, wherein: the solvent is deionized water, the auxiliary agent comprises a leveling agent, a curing agent, a defoaming agent and a dispersing agent, and the total dosage of the auxiliary agent is 3-5 parts.
8. The method for preparing the insulating heat dissipation coating according to claim 1, wherein: the resin diluent is at least one of deionized water, diacetone alcohol, ethylene glycol butyl ether, absolute ethyl alcohol, dimethylethanolamine and the dosage is 5-25% of the weight of the matrix resin.
9. An insulating heat dissipation coating is characterized in that: a preparation method according to any one of claims 1 to 9.
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| CN102850911A (en) * | 2012-07-11 | 2013-01-02 | 浙江理工大学 | Graphene oxide heat dissipation and cooling coating and preparation method thereof |
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| CN103097470A (en) * | 2010-08-05 | 2013-05-08 | 韩华石油化学株式会社 | High-efficiency heat-dissipating paint composition using a carbon material |
| CN102850911A (en) * | 2012-07-11 | 2013-01-02 | 浙江理工大学 | Graphene oxide heat dissipation and cooling coating and preparation method thereof |
| CN112961452A (en) * | 2021-02-07 | 2021-06-15 | 浙江大学 | Preparation method of polymer-based nanocomposite material with high thermal conductivity and low dielectric loss for microwave communication |
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