PTFE/epoxy全有机超疏水涂层制备

采用纳米粒子构筑微-纳粗糙结构制备的超疏水涂层一般存在抗水流冲击能力差的缺点,极大限制了其户外应用前景。利用环氧树脂和聚四氟乙烯(PTFE)纳米粒子,通过喷涂和模压两种工艺分别制备低声阻系数的全有机超疏水涂层,基于水流冲击破坏机理设计实验分析涂层的抗水流冲击性能,并与商用超疏水涂层对比。结果表明:PTFE粒子为70%(质量分数,下同)时,其疏水性能最佳,静态接触角为164.13°,滚动角为3°;PTFE粒子为75%时,其抗水流冲击性能最佳,在被速度为22.77 m/s的水流冲击后接触角仍达到154.62°;与喷涂法相比,模压法能进一步提高涂层的抗水冲击性能。本研究所制备的全有机超疏水涂层同时还具有良好的附着性能和耐磨性能,在进行25次黏附剥离实验后涂层表面接触角为150.51°,滚动角为4°,在进行20次磨损实验后涂层表面接触角为149.21°,滚动角为9°。

Preparation of all-organic superhydrophobic PTFE/epoxy composite coatings

Superhydrophobic coatings with micro-nano hierarchical structure constructed by nano particles usually have a poor behavior in water impact situation.This weakness limits superhydrophobic coatings’outdoor potential applications.A low-acoustic resistance all-organic superhydrophobic coating was prepared by spraying and compression molding methods with epoxy and PTFE particles.Water impact test was designed according to impact failure mechanism,and then water impact resistance was evaluated and compared with commercial superhydrophobic coatings’.The results indicate that the hydrophobicity reaches peak when coating contains 70%(mass fraction,the same below)PTFE particles,with 164.13°water contact angle(WCA)and 3°water slide angle(WSA).For water impact resistance,the coating with 75%PTFE particles has the best performance,it can keep the WCA at 154.62°after 22.77 ms-1 water jet impact test.And the molding coatings have better performance than sprayings.Besides,the results also show coating’s good adhesion and wearability,for example,it can keep the WCA at 150.51°and WSA at 4°after 25-cycle tape peeling test,and keep the WCA at 149.21°and WSA at 9°after 20-cycle wear test.