涂料助剂对PDMS改性环氧树脂/Al复合涂层性能的影响

doi:10.11896/cldb.23010030

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Abstract In order to further reduce the emissivity of the super-hydrophobic low infrared emissivity composite coating and improve the adhesion strength of the coating, dispersant and silane coupling agent KH560 were used to improve the dispersed state and interface structure of the polydimethylsiloxane (PDMS) modified epoxy resin/Al composite coating. The effects of the addition amount of dispersant (mass fraction) and the addition amount of KH560 (mass fraction) on the microstructure, optical properties, hydrophobic properties and adhesion strength of the coating were systematically studied. The results show that the anionic dispersant of polycarboxylate can improve the dispersed state of flake Al powder and nano-SiO₂ in the coating by electrostatic repulsion and reducing the surface energy of filler particles, so that the infrared emissivity of the coating can be reduced to a certain extent, and the coating can have a lower glossiness and good super-hydrophobic property. KH560 can play a bridging action in the coating by using the methoxide and epoxy groups at both ends of its molecular structure. Through the bridging effect of KH560, a good chemical bond can be formed between the resin matrix and the filler in the coating, so that the coating surface structure is more dense, the porosity is reduced, and the emissivity of the coating can be reduced. At the same time, the chemical bond between the resin matrix and the me-tal substrate can be formed by the modification of KH560, which can obviously improve the adhesion strength of the coating. The best emissivity (0.619), glossiness (2.9) and adhesion strength (grade 1) were obtained when the addition amount of dispersant and KH560 was 5% and 3%, respectively. At the same time, the coating has good super-hydrophobic properties (water contact angle is 154°, rolling angle is 6°).

Key words： composite coating low infrared emissivity super-hydrophobic dispersant silane coupling agent

Published: 25 May 2024 Online: 2024-05-28

CLC number:

TN213

Fund:National Natural Science Foundation of China (61705029),Key Project of Scientific Research Plan of Higher Education in Anhui Province (2022AH051121),Key Projects of the Excellent Young Talents Support Plan in Universities of Anhui Province (gxyqZD2020044),Student Innovation Training Program Project of Chuzhou University (2022CXXL2050112).

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	ZHANG Weigang
	LI Jiao
	LYU Dandan

Cite this article:

ZHANG Weigang,LI Jiao,LYU Dandan. Effect of Coating Additives on the Properties of PDMS Modified Epoxy Resin/Al Composite Coatings[J]. Materials Reports, 2024, 38(10): 23010030-5.

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http://www.mater-rep.com/EN/10.11896/cldb.23010030 OR http://www.mater-rep.com/EN/Y2024/V38/I10/23010030

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