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A kind of composite material and its preparation method and application

A technology of composite materials and metal substrates, applied in the field of materials, can solve the problems of poor frost resistance, unsatisfactory overall performance, and unstudied material frost resistance, etc., achieve good frost resistance, suitable for large-scale production, and improve low temperature manufacturing The effect of thermal efficiency

Active Publication Date: 2021-01-26
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the existing technology only has preliminary research on superhydrophobic coatings, and its anti-frost performance is poor or the anti-frost performance of materials has not been studied. There are various problems or defects in materials, the overall performance is not satisfactory, and the needs of practical applications There is a big gap

Method used

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  • A kind of composite material and its preparation method and application
  • A kind of composite material and its preparation method and application
  • A kind of composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] 1. Cleaning of the metal base material: select the aluminum foil fin of the heat exchanger as the metal base material, and use alcohol to fully clean the base material.

[0067] 2. Primer treatment of heat exchanger aluminum foil fins:

[0068] The acetone dispersion of polyvinylidene fluoride (10% by mass concentration) was treated by dip coating on the surface of the above-mentioned cleaned aluminum foil fins of the heat exchanger, and heated and dried at 60° C. for about 30 minutes until the coating was semi-cured.

[0069] 3. Preparation of top coat:

[0070] The acetone dispersion of hydrophobic silica nanoparticles (particle size 50-200nm) with a concentration of 1% by mass is treated by dip coating on the surface of the aluminum foil fin of the above-mentioned primer treatment heat exchanger, and the primer is heated at 150°C The first layer of resin is completely cross-linked and cured, and the physically attached hydrophobic silica nanoparticles are blown off ...

Embodiment 2

[0073] 1. Metal substrate cleaning: use alcohol to fully clean the aluminum foil fins of the heat exchanger.

[0074] 2. Primer treatment of heat exchanger aluminum foil fins:

[0075] Spray the petroleum ether dispersion of methyl silicone oil onto the surface of the above-mentioned cleaned aluminum foil fins of the heat exchanger, and heat and dry at 60°C until the coating is semi-cured.

[0076] 3. Preparation of top coat:

[0077] The ethanol dispersion of hydrophobic silica nanoparticles (particle size 40-100nm) is treated by dip coating on the aluminum foil fin surface of the above-mentioned primer treatment heat exchanger, heated at 150°C to completely cross-link and cure the primer resin, Blow off physically attached hydrophobic silica nanoparticles with an air gun.

[0078] The thickness of the bottom coating is 2-3 μm and the thickness of the top coating is 1-2 μm observed by the scanning electron microscope.

Embodiment 3

[0080] 1. Metal substrate cleaning: use alcohol to fully clean the aluminum foil fins of the heat exchanger.

[0081] 2. Primer treatment of heat exchanger aluminum foil fins:

[0082] Spray the hydrofluoroether dispersion of fluorine-containing butyl acrylate onto the surface of the cleaned aluminum foil fins of the heat exchanger, and heat and dry at 60°C until the coating is semi-cured.

[0083] 3. Preparation of top coat:

[0084] Dip-coat the dispersion of hydrophobic silica nanoparticles (particle size 100-200nm) onto the surface of the aluminum foil fins of the above-mentioned primer-treated heat exchanger, heat the primer resin at 150°C to completely cross-link and solidify, and blow it with an air gun Remove physically attached hydrophobic silica nanoparticles.

[0085] The thickness of the bottom coating is 2-3 μm and the thickness of the top coating is 1-2 μm observed by the scanning electron microscope.

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Abstract

The invention discloses a composite material and a preparation method thereof. Specifically, the composite material includes a metal substrate, an undercoat and a topcoat, the undercoat is a low surface energy coating; the topcoat is a coating containing hydrophobic nanoparticles. The undercoat is made of low surface energy materials, which can improve the wear resistance and adhesion of the coating without affecting the anti-frost performance of the coating; the top coat is a superhydrophobic nanostructure containing hydrophobic nanoparticles, which has excellent anti-frost performance. Moreover, the coating process of the composite material prepared by the invention is simple and suitable for large-scale production. Applied to aluminum foil fins of air-conditioning heat exchangers, the frosting time can be extended by more than 1 times, and the coating is easy to defrost, and it is not easy to leave water bridges. It can improve the low-temperature heating efficiency by more than 10%, and there is no attenuation after long-term frosting for more than 300 cycles. It has a good application prospect in the field of heat exchangers.

Description

technical field [0001] The present invention relates to the field of materials; in particular to a composite material and its preparation method and application Background technique [0002] Condensation and frost are ubiquitous in our daily life and are of great significance to the growth of plants and the balance of ecology. However, in actual production and life, we often need to suppress or even eliminate these two phenomena. For example, in a heat exchanger, the existence of condensation and frost will lead to a significant reduction in thermal efficiency and cause huge energy waste. [0003] Anti-frost coating technology is one of the hot research directions of anti-frost technology at home and abroad. [0004] Low surface energy (super-hydrophobic) coatings can delay the frosting time, and are currently a research hotspot in the academic circles, but they have the disadvantages of poor adhesion and easy failure of the anti-frosting effect. [0005] A known technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D4/00C09D127/16C09D183/04C09D5/08C09D1/00F28F1/28F25B39/00B05D1/02B05D1/18B05D1/28B05D3/02B05D7/14B05D7/24
CPCY02P20/10
Inventor 王立莹熊玉明叶向阳武滔
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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