基于静电喷涂法制备具有微粗糙表面结构的超疏水水性聚氨酯复合材料及其性能研究

Fabrication and Properties of Superhydrophobic Waterborne Polyurethane Composites with Micro-Rough Surface Structure Using Electrostatic Spraying.

作者信息

Wang Fangfang, Feng Lajun, Li Guangzhao, Zhai Zhe, Ma Huini, Deng Bo, Zhang Shengchao

机构信息

School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China.

Key Laboratory of Corrosion and Protection of Shaanxi Province, Xi'an 710048, China.

出版信息

Polymers (Basel). 2019 Oct 24;11(11):1748. doi: 10.3390/polym11111748.

DOI:10.3390/polym11111748

PMID:31653032

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6918225/

Abstract

Waterborne polyurethane (WPU) coatings hold advantages of good toughness, low cost and environmental protection. However, the low water contact angle (WCA), poor wear and corrosion resistance make them unsuitable for application in the superhydrophobic coatings such as antipollution flashover coatings for transmission lines, self-cleaning coatings for outdoor equipment and waterproof textiles. A series of superhydrophobic WPU composites (SHWPUCs) with micro-rough surface structure was prepared by electrostatic spraying nano-SiO particles on WPU composites with low surface energy. It showed that as the hydrophobic system content rose the WCAs of the composites first increased and then remained stationary; however, the adhesion and corrosion resistance first increased and then decreased. An appropriate addition of the hydrophobic system content would lead to a dense coating structure, but an excessive addition could increase the interfaces in the coating and then reduce the coating performance. When the mass ratio of the WPU dispersion, polytetrafluoroethylene (PTFE) particles and modified polydimethylsiloxane was 8:0.3:0.4, 10 g/m nano-SiO particles were sprayed on the uncured coating surface to construct the SHWPUC with a WCA of 156°. Compared with pure WPU coating, its adhesion and corrosion resistance increased by 12.5% and one order of magnitude, respectively; its wear rate decreased by 88.8%.

摘要

水性聚氨酯（WPU）涂料具有韧性好、成本低和环保等优点。然而，其低水接触角（WCA）、耐磨性和耐腐蚀性差，使其不适用于超疏水涂料，如输电线路防污闪涂料、户外设备自清洁涂料和防水纺织品。通过在具有低表面能的WPU复合材料上静电喷涂纳米SiO₂颗粒，制备了一系列具有微粗糙表面结构的超疏水WPU复合材料（SHWPUCs）。结果表明，随着疏水体系含量的增加，复合材料的WCA先增大后趋于稳定；但其附着力和耐腐蚀性先增大后减小。适当添加疏水体系含量会导致涂层结构致密，但过量添加会增加涂层中的界面，进而降低涂层性能。当WPU分散体、聚四氟乙烯（PTFE）颗粒和改性聚二甲基硅氧烷的质量比为8:0.3:0.4时，在未固化的涂层表面喷涂10 g/m²纳米SiO₂颗粒，构建了WCA为156°的SHWPUC。与纯WPU涂层相比，其附着力和耐腐蚀性分别提高了12.5%和一个数量级；磨损率降低了88.8%。