溶剂挥发和相分离法制备环氧树脂基疏水涂层  

Preparation of Epoxy Resin-Based Hydrophobic Coating by Solvent Volatilization and Phase Separation

作　　者：解国庆 张衍[1] 刘育建[1] 方俊[1] XIE Guoqing;ZHANG Yan;LIU Yujian;FANG Jun(Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,特种功能高分子材料及相关技术教育部重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2022年第5期609-615,共7页Journal of East China University of Science and Technology

基　　金：中央高校基本科研业务费专项资金资助(JKD01211701)。

摘　　要：以氟硅氧烷改性的环氧树脂为基体,采用二甲苯/乙酸乙酯混合溶剂制备疏水涂层,研究氟硅氧烷含量、溶剂种类对涂层疏水性能和微观形貌的影响。结果表明:随着氟硅氧烷含量的增加,涂层的接触角逐渐变大;仅以二甲苯为溶剂时,制备的涂层表面较为光滑,最大接触角为105.0°;在二甲苯/乙酸乙酯混合溶剂体系中,由于溶剂挥发速率的差异,涂层表面形成了5~15μm微孔;氟硅氧烷与环氧链段的相分离遵循成核-增长机制,微孔中产生尺寸为0.1~0.6μm的突起,涂层成膜过程中氟和硅自发向外表面迁移以降低其表面能;当氟硅氧烷的质量分数增加到30%时,涂层表面微孔和孔内凸起可以截留更多的空气,涂层的最大接触角提高到约115.5°,疏水性明显提高,并且涂层具有强附着力(5B)和高硬度(6H),表明其应用性能优良。Hydrophobic coatings were prepared in xylene/ethyl acetate as solvent with fluorosiloxane-modified epoxy resin as the matrix.The impact of fluorosiloxane content and solvent type on hydrophobicity,as well as the micromorphology of the coatings were examined.The results showed that with the increase of fluorosiloxane content,the contact angle of the coating enhanced.When just xylene was used as the solvent,the surface of the coating was relatively smooth with a maximum contact angle of 105.0°.In the xylene/ethyl acetate system,5~15μm micropores were formed,which was due to the difference in solvent volatilization rate.Meanwhile,0.1~0.6μm bumps were generated in those micropores along with a phase separation of fluor siloxane and epoxy segments according to the nucleation-growth mechanism.The surface energy of coatings reduced with the spontaneous migration of F and Si to the outer surface during the process of film formation.When the mass fraction of fluorosiloxane segments increased to 30%,much more air could be trapped in the micropores and protrusions.This results in the contact angle of the coating being increased to about 115.5°,and the hydrophobicity was also largely improved.The coating also exhibits a high adhesion of 5B and hardness of 6H,suggesting its potential for real-world applications.

关 键 词：环氧树脂 氟硅氧烷 溶剂挥发 相分离 疏水涂层 

分 类 号：TQ638[化学工程—精细化工]