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Efficient heat dissipation coating for surface of aluminum alloy radiator and preparation method of efficient heat dissipation coating

A heat-dissipating coating and radiator technology, applied in the field of coatings, can solve the problems of reduced thermal conductivity of coatings, attenuation of radiation cooling efficiency, uneven dispersion, etc. Enhance the effect of radiative cooling

Inactive Publication Date: 2021-08-27
江苏恒翊电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing heat dissipation coatings generally use pure graphene powder as a radiation cooling filler. Since graphene is a material that is close to the theoretical blackbody (ε=1) infrared emissivity in the full band, for example, patent CN108003725A uses graphene slurry as radiation cooling Fillers, compounded with epoxy and acrylic resins to prepare radiation cooling coatings, but graphene is easy to agglomerate in this way of simply using as fillers, which makes the radiation cooling performance rapidly decay
In addition, the existing radiative cooling coating also suffers from the reduction of the thermal conductivity of the coating due to the agglomeration of graphene, which increases the thermal resistance during service and affects the radiative cooling performance.
[0004] Taking into account the complex preparation procedures, long preparation cycle, uneven dispersion and difficulty in large-scale preparation of the current existing technology, while improving the cooling efficiency of the radiator

Method used

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  • Efficient heat dissipation coating for surface of aluminum alloy radiator and preparation method of efficient heat dissipation coating
  • Efficient heat dissipation coating for surface of aluminum alloy radiator and preparation method of efficient heat dissipation coating
  • Efficient heat dissipation coating for surface of aluminum alloy radiator and preparation method of efficient heat dissipation coating

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preparation example Construction

[0046]A method for preparing a high-efficiency heat dissipation coating for the surface of an aluminum alloy radiator as described above, comprising the following steps:

[0047] 1) Weigh the radiation-cooled nano-composite material, put it in a container with binder, solvent, and anti-sedimentation agent, and disperse it at a high speed for 20-40 minutes and mix evenly to obtain component A;

[0048] 2) Mix the curing agent of component A and component B at a high speed for 5-10 minutes and disperse evenly to obtain a slurry;

[0049] 3) The slurry is evenly coated on the surface of the metal heat sink by spraying or dipping, and placed at 25-35°C for curing for 10-30 hours to finally obtain the radiation cooling coating for the IGBT power module.

[0050] The preparation mechanism of the present invention is: disperse organic resin, radiation cooling nano-composite material, and anti-sedimentation agent in the solvent evenly to obtain a uniform suspension; quickly add the cu...

Embodiment 1

[0053] (1) Graphite and h-BN nanosheets are prepared in a weight ratio of 5:1 to prepare radiation cooling nanocomposites. The specific preparation process is as follows:

[0054] Put 41.67g of scaly graphite, 8.33g of h-BN nanosheets and 1000g of zirconia balls with a diameter of 6mm into a 0.5L steel sealed tank, vacuumize the sealed tank, and mill at a ball milling speed of 500rpm for 48 hours to obtain The black powder is the radiation cooling nanocomposite;

[0055] (2) 100 parts of radiation cooling nanocomposite material, 100 parts of acrylic resin, 1.5 parts of anti-sedimentation agent organic bentonite, 15 parts of n-butanol and cyclohexanone with a solvent volume ratio of 1:1 were mixed at 1200 rpm for 25 minutes at high speed to obtain component A ;

[0056] (3) After adding 5 parts of curing agent isocyanate of component B to component A, mix at a high speed of 1200 rpm for 5 minutes to obtain a heat-dissipating coating slurry;

[0057] (4) The slurry is uniforml...

Embodiment 2

[0060] (1) Graphite and h-BN nanosheets are prepared in a weight ratio of 3:1 to prepare radiation cooling nanocomposites. The specific preparation process is as follows:

[0061] Put 37.5g of scaly graphite, 12.5g of h-BN nanosheets and 1000g of zirconia balls with a diameter of 6mm into a 0.5L steel sealed tank, vacuumize the sealed tank, and perform ball milling at a ball milling speed of 500rpm for 36h to obtain The black powder is the radiation cooling nanocomposite;

[0062] (2) 200 parts of radiation cooling nanocomposite materials, 100 parts of epoxy resin, 2 parts of anti-settling agent, 20 parts of n-butanol and cyclohexanone with a solvent volume ratio of 1:1 were mixed at 1200 rpm for 35 minutes at high speed to obtain component A;

[0063] (3) After adding 6 parts of curing agent polyamide of component B to component A, mix at a high speed of 1200 rpm for 5 minutes to obtain a heat-dissipating coating slurry;

[0064] (4) The slurry is uniformly coated on the sur...

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Abstract

The invention provides an efficient heat dissipation coating for the surface of an aluminum alloy radiator and a preparation method of the efficient heat dissipation coating. The coating comprises the following raw materials: a radiation cooling nano composite material; and the radiation cooling nano composite material is composed of graphene and h-BN, and the radiation cooling function is achieved through the radiation cooling nanometer composite material. The radiation cooling coating is a dual-function coating with high infrared emissivity and heat conductivity, radiation cooling is greatly enhanced, integration of three heat transfer modes of radiation, convection and conduction is achieved, and the problems that in an existing pure graphene coating, graphene is prone to agglomeration, and the radiation cooling efficiency is not high are solved. The prepared radiation cooling coating has the characteristics of uniform dispersion, excellent mechanical property, excellent heat dissipation and cooling performance and the like. The heat dissipation and cooling requirements of the high-power power module in the fields of aerospace, rail transit, intelligent power grids, new energy and the like can be met.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a high-efficiency heat dissipation coating used on the surface of an aluminum alloy radiator and a preparation method thereof. Background technique [0002] High-power aluminum alloy radiators are widely used in rail transit, smart grid, new energy and other fields. As the power density of power electronic modules continues to increase, the requirements for their thermal management are also becoming increasingly stringent. Taking the power module for high-speed rail as an example, it is required to greatly improve the heat exchange efficiency of the radiator when the power density reaches 100-150W / cm2 without increasing the volume and energy consumption of the radiator. According to the analysis of the steady-state heat flow theory, the key to significantly strengthening the passive radiation heat exchange between the fins and the external space is to reduce the total thermal r...

Claims

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Application Information

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IPC IPC(8): C09D133/04C09D7/61C09D163/00
CPCC09D133/04C09D7/61C09D7/70C09D163/00C08K2003/385C08K2201/011C08K3/04C08K3/38C08K7/00
Inventor 李永许林利李江涛黄维扬邱明惠
Owner 江苏恒翊电子科技有限公司
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