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Aqueous heat dissipation coating and preparation method thereof

A technology of heat-dissipating coatings and water-based dispersions, applied in epoxy resin coatings, coatings, etc., can solve the problems of small contact area and large contact thermal resistance, achieve high infrared emissivity, reduce interface thermal resistance, and improve dispersion. Effect

Active Publication Date: 2015-07-29
芜湖海泰科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this simple mixed addition mode, due to the random distribution of carbon nanomaterials and thermally conductive ceramic fillers in contact, and the contact area is small, the contact thermal resistance between the two is very large.

Method used

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  • Aqueous heat dissipation coating and preparation method thereof

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preparation example Construction

[0044] In a typical embodiment, the preparation method of the nano-carbon-wrapped boron nitride composite powder may include the following steps:

[0045](1) Add the nano-carbon material raw material into the nitric acid solution with a concentration of 2-8 M, reflux at 100-140°C for 1-24 h, then filter, wash the filtrate until neutral, and collect it for later use;

[0046] (2) Disperse the boron nitride powder in an anhydrous solvent, add an amino coupling agent accounting for 1-30% of the weight of the boron nitride powder, mix and stir for 1-24h, then stir at 70-100°C for 30min-1h , then filter, and collect the filtrate for subsequent use;

[0047] (3) Disperse the product obtained in step (1) in water, gradually add the product obtained in step (2) under high-speed stirring, mix and stir for 10min-2h, then filter, collect the filtrate, and vacuum dry at 60-100°C 1-6h, obtain nano-carbon material wrapped boron nitride composite powder;

[0048] In addition, the aforement...

Embodiment 1

[0061] Weigh raw materials according to the following formula (if not specified below, all refer to weight percentage):

[0062] Acrylic modified water-based epoxy resin 20%;

[0063] Auxiliary 3%;

[0064] Carbon nanotube-wrapped boron nitride composite powder 1%;

[0065] Carbon nanotubes 1%;

[0066] Polyacrylic Grinding Resin 2%

[0067] water balance. The aforementioned additives include defoamers, leveling agents, co-solvents, etc. commonly used in the industry.

[0068] The acrylic modified epoxy resin aqueous dispersion is used as the matrix resin, and the ratio is calculated according to the metering ratio. The matrix resin, carbon nanotubes, polyacrylic acid grinding resin, defoamer BYK021, etc. are ground and dispersed in a grinding disperser for 8 hours. Nano carbon material dispersion slurry. Then, under stirring by a high-speed disperser, slowly add the remaining additives and carbon nanotube-wrapped boron nitride composite powder into the carbon nanotube d...

Embodiment 2

[0069] Example 2: The difference between this example and Example 1 lies in that the addition amount of carbon nanotubes is 2%, the infrared radiation coefficient of the coating after film formation is 0.95, the thermal conductivity is 1.2 W / m K, and the hardness is 2H.

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Abstract

The invention discloses an aqueous heat dissipation coating and a preparation method thereof. The aqueous heat dissipation coating comprises an aqueous dispersoid containing a base resin, nanometer carbon material-coated boron nitride composite powder and optional auxiliary materials. The composite powder comprises boron nitride and a boron nitride-coating nanometer carbon material. The preparation method comprises carrying out grinding dispersion on the aqueous dispersoid containing a base resin and the optional auxiliary materials to obtain dispersive slurry, at least adding slowly the composite powder into the dispersive slurry, carrying out high speed stirring and carrying out standing defoaming. The nanometer carbon material-coated boron nitride composite powder is used as a coating filler so that excellent thermal conductivity of the nanometer carbon material and boron nitride and conductive infrared radiation characteristics of the nanometer carbon material are fully utilized, interface thermal resistance of the nanometer carbon material and boron nitride is reduced, and the coating has the advantages of high thermal conductivity, high infrared radiation rate, construction convenience, safety, environmental friendliness and wide application prospect.

Description

technical field [0001] The invention relates to a water-based paint and a preparation method thereof, in particular to a water-based heat-dissipating paint and a preparation method thereof. Background technique [0002] Heat dissipation paint is a functional paint that improves the heat dissipation efficiency of the object surface by enhancing the infrared radiation rate of the heat source surface. Traditional heat dissipation modes mainly include heat conduction, convection, and radiation heat dissipation. In many fields that require efficient heat dissipation, due to space, size, and environmental constraints, it is impossible to exchange heat in the form of accelerated forced convection, and heat conduction alone cannot meet the demand. Under such circumstances, enhanced infrared radiation cooling is the preferred solution. Since many materials in nature have a high thermal radiation system, such as coating resin itself, its thermal conductivity is very low, and the cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/10C09D163/00C09D7/12
CPCC08K2201/011C09D7/61C09D7/67C09D163/00C09D163/10C08L33/00C08K9/10C08K2003/385C08K7/24C08K3/04
Inventor 陈名海董其宝李清文徐坤元
Owner 芜湖海泰科新材料有限公司
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