基于改性纳米二氧化硅构筑棉织物超疏水表面

Fabrication of Superhydrophobic Cotton Fabrics Based on Modified Nano-silica

本文以γ-氨基丙基三甲氧基硅烷(APTMS)为改性剂,对纳米二氧化硅进行表面改性,并将其整理到棉织物上,随后利用十六烷基三甲氧基硅烷(HDTMS)对织物进行修饰,通过两步法获得棉织物超疏水界面。探讨反应条件对改性纳米Si O2的影响,并对改性纳米Si O2和整理后棉织物进行测试表征。结果表明,当温度为30℃,正硅酸四乙酯(TEOS)浓度为3%和APTMS浓度为2%,氨水用量为2 m L时,制备的改性纳米Si O2溶胶平均粒径为65.88nm,PDI为0.096,分散性较好。两步法整理后的棉织物接触角为150.36°,滚动角为8°,实现了超疏水效果,并且洗涤20次后仍具有一定疏水性。

Superhydrophobic cotton fabrics were successfully obtained via two-step process by the incorporation of modified silica nanoparticles and subsequent hydrophobization with hexadecyltrimethoxysilane（ HDTMS）. The influence of reaction conditions on the modified nano-silica was discussed. The modified nano-silica and treated cotton fabrics were characterized. The results showed that the modified nano-silica sol with good dispersion stability could be obtained at 30 ℃ when the concentration of tetraethyl orthosilicate（ TEOS） was 3%,the concentration of γ-amino propyl trimethoxy silane（ APTMS） was 2% and the amnonia amount was 2 m L. The prepared modified nano-silica had narrow size distribution with an average particle diameter of 65. 88 nm and polydispersity index（ PDI） of0. 096. The cotton fabrics treated by two-step process exhibited excellent water repellency with the water contact angle（ CA） of 150. 36° and the shedding angle（ SHA） of 8°. In addition,after 20 washing cycles,the treated cotton fabric still had water repellency.