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°).
通讯作者:
*张伟钢,滁州学院材料与化学工程学院副教授、硕士研究生导师。2006年河南科技学院化学工程系化学工程与工艺专业本科毕业,2009年广西大学化学化工学院化学工艺专业硕士毕业,2014年南京航空航天大学材料科学与技术学院材料物理与化学专业博士毕业,2014年9月到滁州学院工作至今。目前主要从事特种功能涂层材料方面的研究工作。发表学术论文50余篇,包括Progress in Organic Coatings、Infrared Physics & Technology、Materials Science and Engineering C、Materials Research Bulletin等。abczwg15@163.com
引用本文:
张伟钢, 李娇, 吕丹丹. 涂料助剂对PDMS改性环氧树脂/Al复合涂层性能的影响[J]. 材料导报, 2024, 38(10): 23010030-5.
ZHANG Weigang, LI Jiao, LYU Dandan. Effect of Coating Additives on the Properties of PDMS Modified Epoxy Resin/Al Composite Coatings. Materials Reports, 2024, 38(10): 23010030-5.
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