CN115851026A - High-thermal-conductivity insulating electrophoretic paint and preparation method thereof - Google Patents
High-thermal-conductivity insulating electrophoretic paint and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an insulating electrophoretic paint with high thermal conductivity and a preparation method thereof. Firstly, adding graphene nanosheets and a dispersing agent into a solvent, and stirring to obtain a graphene dispersion liquid; adding hexagonal boron nitride and a dispersing agent into a solvent, stirring to obtain a hexagonal boron nitride dispersion liquid, centrifuging, taking a supernatant, adding a silane coupling agent hydrolysate, and stirring to obtain a modified hexagonal boron nitride dispersion liquid; mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to a volume ratio of 1:1-3; and finally, adding the additive into the electrophoretic paint to obtain the high-thermal-conductivity insulating electrophoretic paint. The electrophoretic paint is used as bath solution to coat the surface of metal, and a magnetic field is applied to the bath solution during coating. According to the method, the heat conductivity of the electrophoretic paint is enhanced by adopting the combined dispersion liquid of few layers of hexagonal boron nitride and graphene nanosheets, the functional additives are chemically connected by using the silane coupling agent, and the metal coating has good insulating property and heat conductivity.
Description
Technical Field
The invention belongs to the technical field of metal surface coatings, and particularly relates to high-thermal-conductivity insulating electrophoretic paint and a preparation method thereof.
Background
Heat dissipation is a key technology in the use of electric car batteries, electronic components, satellites, and the like. Graphene is the highest thermal conductivity material so far, and is higher than single-walled carbon nanotubes (3500W/m.K) and multi-walled carbon nanotubes (3000W/m.K), and the thermal conductivity of pure defect-free single-layer graphene is as high as 5300W/mK, which means that the temperature difference of two side surfaces is 1K, and the heat transferred by the area of 1 square meter in 1 second can reach 5300W. The heat conductivity coefficient of the graphene heat-conducting film and the graphene coating can also reach 600W/m.K. Meanwhile, graphene also has excellent conductivity.
At present, electric automobiles gradually become the development trend of modern and future automobile industries, batteries still can work reliably and durably at the temperature of a use environment, and the heat dissipation capability becomes an important limiting factor influencing the service life of the batteries. At present, the cooling technology of the electric automobile mainly adopts air cooling and water cooling. Air cooling is introduced, the volume is increased, noise is generated, and additional unstable factors are increased due to the stability of fan operation; the liquid cooling is introduced, the high-requirement intensive liquid cooling technology is not mature at present, and the system of the existing air cooling liquid cooling technology is complex, heavy, difficult to maintain and repair and has the possibility of liquid leakage. Meanwhile, other ways of improving heat dissipation also have a series of problems: the increase of the heat dissipation area inevitably leads to the increase of the volume and the weight, the increase of the energy consumption, the reduction of the operation stability and the increase of the emission of carbon dioxide; the material replacement, such as aluminum replacement by copper, has limited promotion, obviously increased weight and obviously increased cost; the heat pipe is introduced to basically realize the quick conduction of concentrated heat, but if the heat dissipation is not timely, the cold end and the hot end of the heat pipe reach thermal balance, and the heat pipe fails.
The heat of the satellite flying in space mainly has two sources, one is the heat generated by solar radiation, the other is the heat generated by the working of the parts of the satellite, the two types of heat are added and accumulated in the satellite, if the heat is not dissipated for a long time, the satellite is slightly failed, and the satellite is directly burnt. Electronic equipment on an aerospace vehicle has the characteristics of small volume, light weight and low power consumption, and for small and medium-sized civil and commercial aerospace satellites, the electronic equipment has the compact and miniaturized design concepts, so that a plurality of electronic elements are integrated in smaller and smaller areas, the heat flux density is increased rapidly, and the heat dissipation and heat preservation of electronic devices are more difficult due to the special environmental conditions. The thermal control technology level of the satellite is relatively low, and the problems of high cost, long development period and the like generally exist.
Disclosure of Invention
An object of the present invention is to provide a method for preparing a high thermal conductivity insulating electrophoretic paint.
The method comprises the following steps:
preparing a graphene dispersion liquid:
adding graphene nanosheets GNP and a dispersing agent into a solvent, and uniformly stirring at normal temperature by using high-shear equipment to obtain a graphene dispersion liquid. The stirring time of the high-shear equipment is 2 to 3 hours, and the rotating speed is 5000 to 8000 revolutions per hour.
The transverse size of the graphene nano sheet GNP is 0.1-1.0 mu m, and the number of layers is 11-200. 2.0-20.0 g of graphene nano-sheet GNP is added into each liter of solvent, and 5.0-10.0 g is preferred. 0.02-0.5 g of dispersant is correspondingly added into every gram of graphene nano-sheets GNP, and 0.05-0.2 g is preferred.
After stirring by high-shear equipment, the graphene nanosheets GNP are further stripped, the number of layers of the graphene nanosheets GNP is reduced, part of the graphene nanosheets GNP are converted into few-layer graphene FLG with the number of layers being less than or equal to 10, the FLG/GNP are uniformly dispersed, and no agglomeration exists under the action of space electrostatic repulsion. The smaller the number of graphene layers, the higher the thermal conductivity.
Preparing modified hexagonal boron nitride dispersion liquid in step (2):
adding the hexagonal boron nitride h-BN and the dispersing agent into a solvent, and uniformly stirring by using high-shear equipment at normal temperature to obtain the hexagonal boron nitride dispersion liquid. The stirring time is 4-5 hours, and the rotating speed is 5000-8000 rpm/hour.
The transverse size of the hexagonal boron nitride h-BN is 0.1-1.0 mu m, and the number of layers is 11-100. 2.0 to 20.0g of hexagonal boron nitride h-BN is added per liter of solvent, preferably 5.0 to 10.0g. 0.02-0.5 g of dispersant is correspondingly added into each gram of hexagonal boron nitride h-BN, and 0.05-0.2 g is preferred.
After the mixture is stirred by high-shear equipment, the hexagonal boron nitride h-BN is further stripped, the number of layers of the hexagonal boron nitride h-BN is reduced, part of the hexagonal boron nitride h-BN is converted into the hexagonal boron nitride h-BN with the number of layers less than or equal to 10, the hexagonal boron nitride h-BN with various layers is uniformly dispersed, and no agglomeration exists under the action of space electrostatic repulsion. The smaller the number of layers of the hexagonal boron nitride h-BN, the higher the thermal conductivity.
Centrifuging the hexagonal boron nitride dispersion liquid for 10-60 minutes at the rotating speed of 4000-6000 r/h, taking supernatant, then adding silane coupling agent hydrolysate, and stirring for 2-3 hours at normal temperature to connect the hexagonal boron nitride h-BN with the silane coupling agent, thereby obtaining the modified hexagonal boron nitride dispersion liquid.
The silane coupling agent hydrolysate is a silane coupling agent aqueous solution with the mass fraction of 2-8%, the silane coupling agent is an amino or epoxy silane coupling agent, and is preferably one of N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane, gamma-aminopropylmethyldiethoxysilane, gamma-aminopropyltrimethoxysilane, aminopropyltriethoxysilane and gamma- (3,2-epoxypropoxy) propyltrimethoxysilane. Adding 0.4-4.0 g of silane coupling agent hydrolysate into each liter of supernatant.
The solvent adopted in the steps (1) and (2) is the same and is one of water, ethylene glycol butyl ether BCS, methyl isobutyl ketone MIBK, ethylene glycol tert-butyl ether ETB, isopropanol IPA and N-methyl pyrrolidone NMP.
The dispersing agents adopted in the steps (1) and (2) are the same and are polymer surfactants, preferably one of BYK-3560, BYK-4509 and BYK-4510.
And (3) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into the additive according to the volume ratio of 1:1-3.
And (4) uniformly mixing the additive and the electrophoretic paint to obtain the high-thermal-conductivity insulating electrophoretic paint. 1-100 g of additive is added into each kilogram of electrophoretic paint; preferably 5 to 50 grams.
Another object of the present invention is to provide a high thermal conductivity insulating electrophoretic paint prepared according to the above method, having a pH of 5.4 to 6.2 and an electrical conductivity of 1000 to 2000. Mu.S/cm. The electrophoretic paint can be used for heat-dissipating insulating coatings of electric vehicles (battery boxes), satellites, space stations, electronic components and the like.
And coating the metal surface by using the prepared electrophoretic paint as bath solution. When coating, a planar metal plate to be coated is vertically placed in bath liquid, a thick magnet is placed outside one side of an electrophoresis tank workpiece, a magnetic field is applied to the bath liquid, so that a graphene plane in an electrophoretic coating of the metal plate is perpendicular to a surface plane of the workpiece, the heat dissipation of the metal surface coating is improved, and the strength of the magnetic field is 0.1-1.0 Tesla. Electrophoretic coating process parameters: the electrophoresis voltage is 60-160V DC voltage or pulse voltage, the electrophoresis time is 60-240 s, and the bath solution temperature is 25-32 ℃.
The method adopts the stable combined dispersion liquid of few-layer hexagonal boron nitride h-BN and graphene nano-sheet GNP under steric hindrance repulsion to enhance the heat conduction capability of the electrophoretic paint, and uses silane coupling agent to chemically connect the functional additive. The h-BN has good insulating property and heat conducting property at room temperature, the GNP has good electric conductivity and heat conducting property, the h-BN and the FLG can achieve good insulating effect after being connected in a chemical mode, the requirement of the coating needing insulation in certain applications is met, meanwhile, an external magnetic field can promote the graphene to be directionally arranged perpendicular to the plane of the matrix (the graphene has the best heat dissipation effect under the arrangement mode), compared with a simple epoxy resin coating, the GNP/h-BN composite coating preparation method adopted by the method can improve the heat conductivity at room temperature by more than 100 times (from 0.2W/(m.K) to 30W/(m.K)), and the surface volume resistivity of the coating is more than 1010 omega.m.
Detailed Description
The present invention is further illustrated by the following examples. The graphene nanoplatelets GNP used in the following examples have a lateral dimension of 0.1 to 1.0 μm and a number of layers of 11 to 200; the transverse size of the hexagonal boron nitride h-BN is 0.1-1.0 mu m, and the number of layers is 11-100.
Example 1.
Adding 2.0g of graphene nanosheet GNP and 1.0g of dispersant BYK-3560 into 1 liter of water, and stirring for 3 hours at normal temperature by using high-shear equipment at the rotating speed of 5000 revolutions per hour to obtain a graphene dispersion liquid.
Step (2), adding 6.0g of hexagonal boron nitride h-BN and 1.8g of dispersant BYK-3560 into 1 liter of water, and stirring for 4.5 hours at normal temperature by using high-shear equipment at the rotating speed of 6000 revolutions per hour to obtain hexagonal boron nitride dispersion liquid; centrifuging the hexagonal boron nitride dispersion liquid for 10 minutes at the rotating speed of 6000 revolutions per hour, and taking supernatant; and then adding 0.4g of N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane aqueous solution with the mass fraction of 8% into each liter of supernatant, and stirring for 150 minutes at normal temperature to obtain the modified hexagonal boron nitride dispersion.
And (3) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to the volume ratio of 1:2.
And (4) uniformly mixing the additive and the electrophoretic paint according to the mass ratio of 1.
The prepared high-thermal-conductivity insulating electrophoretic paint is used as bath solution, a planar metal plate to be coated is vertically placed in the bath solution, a thick magnet is placed outside one side of an electrophoretic bath workpiece, and a magnetic field with the strength of 0.1 Tesla is applied to the bath solution, so that a graphene plane in an electrophoretic coating of the metal plate is perpendicular to the surface plane of the workpiece. Electrophoretic coating process parameters: the electrophoresis voltage is 160V direct current voltage, the electrophoresis time is 60s, the bath solution temperature is 27 ℃, and the thickness of the composite coating film of the electrophoretic paint is 22 mu m.
Example 2.
Adding 5.0g of graphene nanosheet GNP and 2.0g of dispersant BYK-4509 into 1L of ethylene glycol butyl ether solvent, and stirring for 170 minutes at normal temperature by using high-shear equipment at the rotating speed of 5500 revolutions per hour to obtain the graphene dispersion liquid.
Adding 8.0g of hexagonal boron nitride h-BN and 1.6g of dispersant BYK-4509 into 1 liter of ethylene glycol butyl ether solvent, and stirring for 260 minutes at normal temperature by using high-shear equipment at the rotating speed of 7000 r/h to obtain hexagonal boron nitride dispersion liquid; centrifuging the hexagonal boron nitride dispersion liquid for 15 minutes at the rotating speed of 5800 r/h, and taking a supernatant; and then adding 1.0g of gamma-aminopropylmethyldiethoxysilane aqueous solution with the mass fraction of 7% into each liter of supernatant, and stirring for 3 hours at normal temperature to obtain the modified hexagonal boron nitride dispersion.
And (3) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to the volume ratio of 2:3.
And (4) uniformly mixing the additive and the electrophoretic paint according to the mass ratio of 3.
The prepared high-thermal-conductivity insulating electrophoretic paint is used as bath solution, a planar metal plate to be coated is vertically placed in the bath solution, a thick magnet is placed outside one side of an electrophoretic bath workpiece, and a magnetic field with the strength of 0.2 Tesla is applied to the bath solution, so that a graphene plane in an electrophoretic coating of the metal plate is perpendicular to the surface plane of the workpiece. Electrophoretic coating process parameters: the electrophoresis voltage is 140V pulse voltage, the electrophoresis time is 80s, the bath solution temperature is 30 ℃, and the thickness of the composite coating film of the electrophoretic paint is 23 mu m.
Example 3.
Step (1), adding 6.0g of graphene nanosheet GNP and 1.8g of dispersant BYK-4510 into 1 liter of methyl isobutyl ketone solvent, and stirring for 160 minutes at normal temperature by using high-shear equipment at the rotating speed of 6000 revolutions per hour to obtain graphene dispersion liquid.
Adding 2.0g of hexagonal boron nitride h-BN and 1.0g of dispersant BYK-4510 into 1 liter of methyl isobutyl ketone solvent, and stirring for 5 hours at normal temperature by using high-shear equipment at the rotating speed of 5000 r/h to obtain hexagonal boron nitride dispersion liquid; centrifuging the hexagonal boron nitride dispersion liquid for 20 minutes at a rotating speed of 5500 revolutions per hour, and taking a supernatant; and then adding 1.5g of gamma-aminopropyltrimethoxysilane aqueous solution with the mass fraction of 6% into each liter of supernatant, and stirring for 2 hours at normal temperature to obtain the modified hexagonal boron nitride dispersion.
And (3) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to the volume ratio of 1:1.
And (4) uniformly mixing the additive and the electrophoretic paint according to the mass ratio of 1.
The prepared high-thermal-conductivity insulating electrophoretic paint is used as bath solution, a planar metal plate to be coated is vertically placed in the bath solution, a thick magnet is placed outside one side of an electrophoretic bath workpiece, and a magnetic field with the strength of 0.3 Tesla is applied to the bath solution, so that a graphene plane in an electrophoretic coating of the metal plate is perpendicular to the surface plane of the workpiece. Electrophoretic coating process parameters: the electrophoresis voltage is 120V direct current voltage, the electrophoresis time is 100s, the bath solution temperature is 25 ℃, and the thickness of the electrophoretic paint composite coating film is 24.5 mu m.
Example 4.
Adding 8.0g of graphene nanosheet GNP and 1.6g of dispersant BYK-3560 into 1 liter of ethylene glycol tert-butyl ether solvent, and stirring for 2.5 hours at normal temperature by using high-shear equipment at the rotating speed of 6500 r/h to obtain the graphene dispersion liquid.
Adding 5.0g of hexagonal boron nitride h-BN and 2.0g of dispersant BYK-3560 into 1 liter of ethylene glycol tert-butyl ether solvent, and stirring for 250 minutes at normal temperature by using high-shear equipment at the rotating speed of 7500 r/h to obtain hexagonal boron nitride dispersion liquid; centrifuging the hexagonal boron nitride dispersion liquid for 30 minutes at the rotating speed of 5000 r/h, and taking supernatant; and then adding 2.0g of aminopropyltriethoxysilane aqueous solution with the mass fraction of 5% into each liter of supernatant, and stirring at normal temperature for 160 minutes to obtain the modified hexagonal boron nitride dispersion.
And (3) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to the volume ratio of 1:3.
And (4) uniformly mixing the additive and the electrophoretic paint according to the mass ratio of 1.
The prepared high-thermal-conductivity insulating electrophoretic paint is used as bath solution, a planar metal plate to be coated is vertically placed in the bath solution, a thick magnet is placed outside one side of an electrophoretic bath workpiece, and a magnetic field with the strength of 0.4 Tesla is applied to the bath solution, so that a graphene plane in an electrophoretic coating of the metal plate is perpendicular to the surface plane of the workpiece. Electrophoretic coating process parameters: the electrophoresis voltage is 100V pulse voltage, the electrophoresis time is 120s, the bath solution temperature is 28 ℃, and the thickness of the composite coating film of the electrophoretic paint is 25 mu m.
Example 5.
Step (1), adding 10.0g of graphene nanosheet GNP and 0.8g of dispersant BYK-4509 into 1 liter of isopropanol solvent, and stirring for 140 minutes at normal temperature by using high-shear equipment at the rotating speed of 7000 revolutions per hour to obtain the graphene dispersion liquid.
Adding 16.0g of hexagonal boron nitride h-BN and 0.8g of dispersant BYK-4509 into 1 liter of isopropanol solvent, and stirring for 290 minutes at normal temperature by using high-shear equipment at the rotating speed of 5500 revolutions per hour to obtain hexagonal boron nitride dispersion liquid; centrifuging the hexagonal boron nitride dispersion liquid for 40 minutes at the rotating speed of 5000 r/h, and taking supernatant; and then adding 2.5g of gamma- (3,2-epoxypropoxy) propyl trimethoxy silane aqueous solution with the mass fraction of 4% into each liter of supernatant, and stirring for 140 minutes at normal temperature to obtain the modified hexagonal boron nitride dispersion.
And (3) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to the volume ratio of 2:5.
And (4) uniformly mixing the additive and the electrophoretic paint according to the mass ratio of 1.
The prepared high-thermal-conductivity insulating electrophoretic paint is used as bath solution, a planar metal plate to be coated is vertically placed in the bath solution, a thick magnet is placed outside one side of an electrophoretic bath workpiece, and a magnetic field with the strength of 0.5 Tesla is applied to the bath solution, so that a graphene plane in an electrophoretic coating of the metal plate is perpendicular to the surface plane of the workpiece. Electrophoretic coating process parameters: the electrophoresis voltage is 90V direct current voltage, the electrophoresis time is 140s, the bath solution temperature is 32 ℃, and the thickness of the composite coating film of the electrophoretic paint is 23 mu m.
Example 6.
Adding 12.0g of graphene nanosheet GNP and 1.2g of dispersant BYK-4510 into 1 liter of N-methylpyrrolidone solvent, and stirring for 250 minutes at normal temperature by using high-shear equipment at the rotating speed of 7500 r/h to obtain the graphene dispersion liquid.
Adding 20.0g of hexagonal boron nitride h-BN and 0.4g of dispersant BYK-4510 into 1 liter of N-methyl pyrrolidone solvent, and stirring for 280 minutes at normal temperature by using high-shear equipment at the rotating speed of 6000 revolutions per hour to obtain hexagonal boron nitride dispersion liquid; centrifuging the hexagonal boron nitride dispersion liquid for 45 minutes at the rotating speed of 5000 r/h, and taking supernatant; and then adding 3.0g of N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane aqueous solution with the mass fraction of 4% into each liter of supernatant, and stirring at normal temperature for 2.5 hours to obtain the modified hexagonal boron nitride dispersion.
And (3) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to the volume ratio of 1:2.
And (4) uniformly mixing the additive and the electrophoretic paint according to the mass ratio of 2.
The prepared high-thermal-conductivity insulating electrophoretic paint is used as bath solution, a planar metal plate to be coated is vertically placed in the bath solution, a thick magnet is placed outside one side of an electrophoresis tank workpiece, a magnetic field with the strength of 0.6 Tesla is applied to the bath solution, and a graphene plane in an electrophoretic coating of the metal plate is perpendicular to the surface plane of the workpiece. Electrophoretic coating process parameters: the electrophoresis voltage is 80V pulse voltage, the electrophoresis time is 160min, the bath solution temperature is 25 ℃, and the thickness of the composite coating film of the electrophoretic paint is 22 mu m.
Example 7.
Adding 16.0g of graphene nanosheet GNP and 0.8g of dispersant BYK-3560 into 1 liter of water, and stirring for 2 hours at normal temperature by using high-shear equipment at the rotating speed of 8000 revolutions per hour to obtain the graphene dispersion liquid.
Adding 12.0g of hexagonal boron nitride h-BN and 1.2g of dispersant BYK-3560 into 1 liter of water, and stirring for 4 hours at normal temperature by using high-shear equipment at the rotating speed of 8000 revolutions per hour to obtain hexagonal boron nitride dispersion liquid; centrifuging the hexagonal boron nitride dispersion liquid for 50 minutes at the rotating speed of 4500 revolutions per hour, and taking supernatant; and then adding 3.5g of gamma-aminopropylmethyldiethoxysilane aqueous solution with the mass fraction of 3% into each liter of supernatant, and stirring for 3 hours at normal temperature to obtain the modified hexagonal boron nitride dispersion.
And (3) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to the volume ratio of 2:3.
And (4) uniformly mixing the additive and the electrophoretic paint according to the mass ratio of 1.
The prepared high-thermal-conductivity insulating electrophoretic paint is used as bath solution, a planar metal plate to be coated is vertically placed in the bath solution, a thick magnet is placed outside one side of an electrophoretic bath workpiece, and a magnetic field with the strength of 0.8 Tesla is applied to the bath solution, so that a graphene plane in an electrophoretic coating of the metal plate is perpendicular to the surface plane of the workpiece. Electrophoretic coating process parameters: the electrophoresis voltage is 70V direct current voltage, the electrophoresis time is 180s, the bath solution temperature is 30 ℃, and the thickness of the composite coating film of the electrophoretic paint is 21 mu m.
Example 8.
Adding 20.0g of graphene nanosheet GNP and 0.4g of dispersing agent BYK-4509 into 1L of isopropanol solvent, and stirring for 120 minutes at normal temperature by using high-shear equipment at the rotating speed of 6000 revolutions per hour to obtain graphene dispersion liquid.
Adding 10.0g of hexagonal boron nitride h-BN and 0.8g of dispersant BYK-4509 into 1 liter of isopropanol solvent, and stirring for 4.5 hours at normal temperature by using high-shear equipment at the rotating speed of 6500 r/h to obtain hexagonal boron nitride dispersion liquid; centrifuging the hexagonal boron nitride dispersion liquid for 60 minutes at the rotating speed of 4000 revolutions per hour, and taking supernatant; and then adding 4.0g of aminopropyltriethoxysilane aqueous solution with the mass fraction of 2% into each liter of supernatant, and stirring at normal temperature for 2 hours to obtain the modified hexagonal boron nitride dispersion.
And (3) mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to the volume ratio of 2:5.
And (4) uniformly mixing the additive and the electrophoretic paint according to the mass ratio of 1.
The prepared high-thermal-conductivity insulating electrophoretic paint is used as bath solution, a planar metal plate to be coated is vertically placed in the bath solution, a thick magnet is placed outside one side of an electrophoretic bath workpiece, and a magnetic field with the strength of 1.0 Tesla is applied to the bath solution, so that a graphene plane in an electrophoretic coating of the metal plate is perpendicular to the surface plane of the workpiece. Electrophoretic coating process parameters: the electrophoresis voltage is 60V pulse voltage, the electrophoresis time is 240s, the bath solution temperature is 26 ℃, and the film thickness of the composite coating of the electrophoretic paint is 20 mu m.
Comparative example.
The process was the same as in example 1 except that the graphene and h-BN mixed additive was not added to the bath.
The electrophoretic paints prepared in examples 1 to 8 and comparative example were tested for resistivity and thermal conductivity by the following test methods: the electrophoretic paint surface resistivity test is carried out according to the standard HG/T3331-2012; the heat conductivity test is carried out according to the standard GB/T22588-2008. The results are shown in the following table:
as can be seen from the above table, the graphene is combined with the h-BN by adding the silane coupling agent, and the mixed additive of the graphene and the h-BN is well dispersed in the electrophoretic paint. The electrophoretic paint prepared by the invention is insulating, has obviously improved heat conductivity coefficient and has better stability.
Claims (11)
1. A preparation method of high-thermal-conductivity insulating electrophoretic paint is characterized by comprising the following steps:
preparing a graphene dispersion liquid:
adding graphene nanosheets GNP and a dispersing agent into a solvent, and stirring at normal temperature by using high-shear equipment to obtain a graphene dispersion liquid; adding 2.0-20.0 g of graphene nano-sheets GNP into each liter of solvent, and correspondingly adding 0.02-0.5 g of dispersing agent into each gram of graphene nano-sheets GNP;
preparing modified hexagonal boron nitride dispersion liquid in step (2):
adding hexagonal boron nitride h-BN and a dispersing agent into a solvent, and stirring by using high-shear equipment at normal temperature to obtain a hexagonal boron nitride dispersion liquid; adding 2.0-20.0 g of hexagonal boron nitride h-BN into each liter of solvent, and correspondingly adding 0.02-0.5 g of dispersing agent into each gram of hexagonal boron nitride h-BN;
centrifuging the hexagonal boron nitride dispersion liquid, taking supernatant, adding silane coupling agent hydrolysate, and stirring at normal temperature for 2-3 hours to obtain modified hexagonal boron nitride dispersion liquid; the silane coupling agent hydrolysate is a silane coupling agent aqueous solution with the mass fraction of 2-8%, the silane coupling agent is an amino silane coupling agent or an epoxy silane coupling agent, and 0.4-4.0 g of silane coupling agent hydrolysate is added into per liter of supernatant;
the dispersing agents adopted in the steps (1) and (2) are the same and are high molecular surfactants;
mixing the graphene dispersion liquid and the modified hexagonal boron nitride dispersion liquid into an additive according to a volume ratio of 1:1-3;
step (4), uniformly mixing the additive and the electrophoretic paint to obtain the high-thermal-conductivity insulating electrophoretic paint; 1-100 g of additive is added into each kilogram of electrophoretic paint.
2. The method for preparing the high thermal conductivity insulating electrophoretic paint according to claim 1, wherein: the transverse size of the graphene nano sheet GNP is 0.1-1.0 mu m, and the number of layers is 11-200.
3. The method for preparing a high thermal conductivity insulating electrophoretic paint as claimed in claim 1, wherein: in the step (1), the stirring time of the high shear equipment is 2-3 hours, and the rotating speed is 5000-8000 rpm/hour.
4. The method for preparing a high thermal conductivity insulating electrophoretic paint as claimed in claim 1, wherein: in the step (1), 5.0-10.0 g of graphene nanoplatelets GNP are added into each liter of solvent, and 0.05-0.2 g of dispersant is correspondingly added into each gram of graphene nanoplatelets GNP.
5. The method for preparing a high thermal conductivity insulating electrophoretic paint as claimed in claim 1, wherein: in the step (2), the stirring time of the high shear equipment is 4-5 hours, and the rotating speed is 5000-8000 rpm/hour.
6. The method for preparing a high thermal conductivity insulating electrophoretic paint as claimed in claim 1, wherein: in the step (2), 5.0-10.0 g of hexagonal boron nitride h-BN is added into each liter of solvent, and 0.05-0.2 g of dispersant is correspondingly added into each gram of hexagonal boron nitride h-BN.
7. The method for preparing a high thermal conductivity insulating electrophoretic paint as claimed in claim 1, wherein: in the step (2), the hexagonal boron nitride dispersion liquid is centrifuged for 10 to 60 minutes at the rotating speed of 4000 to 6000 revolutions per hour.
8. The method for preparing a high thermal conductivity insulating electrophoretic paint as claimed in claim 1, wherein: the silane coupling agent is one of N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane, gamma-aminopropylmethyldiethoxysilane, gamma-aminopropyltrimethoxysilane, aminopropyltriethoxysilane and gamma- (3,2-epoxypropoxy) propyltrimethoxysilane.
9. The method for preparing a high thermal conductivity insulating electrophoretic paint as claimed in claim 1, wherein: the solvent adopted in the steps (1) and (2) is the same and is one of water, ethylene glycol butyl ether BCS, methyl isobutyl ketone MIBK, ethylene glycol tert-butyl ether ETB, isopropanol IPA and N-methyl pyrrolidone NMP.
10. The method for preparing a high thermal conductivity insulating electrophoretic paint as claimed in claim 1, wherein: in the step (4), 5-50 g of additive is added into each kilogram of electrophoretic paint.
11. A high thermal conductivity insulating electrophoretic paint prepared by the method as claimed in any one of claims 1 to 10, having a pH of 5.4 to 6.2 and an electrical conductivity of 1000 to 2000 μ S/cm.
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Citations (7)
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