织物表面耐久性超疏水涂层的组装及性能研究

Assembly and performance of durable superhydrophobic coating on fabric surface

以3-缩水甘油醚氧丙基三甲氧基硅烷(KH560)、聚十二烷基/甲基倍半硅氧烷(PDMSQ)纳米球乳液和交联型氨基硅乳(JASO)为构筑基元,选用棉织物作为基质,通过层层自组装技术制备了一种耐久性超疏水涂层。通过单因素实验对工艺条件进行了优化,通过X射线光电子能谱仪、场发射扫描电子显微镜(FESEM)对织物表面超疏水涂层的化学组成和微观形貌进行了分析。结果表明,制备的超疏水涂层符合预期设想;当KH560质量分数为1%、PDMSQ纳米球乳液固含量为2%、JASO乳液固含量为1%时,超疏水涂层水静态接触角(WCA)达160.8°。超疏水涂层经皂洗25次后,WCA仍为144.6°。FESEM分析表明,PDMSQ纳米球均匀地附着在棉织物纤维表面,与棉织物纤维本身的微米级结构协同形成了微/纳米级粗糙结构,为构筑超疏水织物提供了有利条件,成功制备了耐久性超疏水涂层。

A durable superhydrophobic coating was fabricated via LBL self-assembly technology with 3-glycidyl oxypropyl trimethoxysilane(KH560),poly dodecyl/methylsilsesquioxane(PDMSQ)latex and crosslinked aminopolysiloxane(JASO)latex as building units,cotton fabrics as film-forming substrates.Finally,the application process were optimized by single factor experiments.The chemical composition and microscopic morphology of the fabric surface was analyzed by XPS and FESEM.Results shown that the as-prepared coating had an expected structure.Superhydrophobicity of the treated fabric was the best with static water contact angles(WCA)of 160.8°while the mass fraction of KH560,the solid contents of PDMSQ and JASO latexes were 1%,2%,and 1%,respectively.WCA could still reach 144.6°after 25 soaping cycles.FESEM results indicated that PDMSQ were evenly adsorbed on the cotton fabric surface and created a micro/nano dual scaled roughness in combination with micro-scaled roughness of cotton fibers itself,which finally provided favorable conditions for the construction of the superhydrophobic fabric and successfully prepared durable superhydrophobic coating.