PDA/DTMS-纳米TiO2对蚕丝织物自修复超疏水整理

Self-repairing superhydrophobic finishing of silk fabrics by PDA/DTMS-nanoTiO2

摘要:

为了赋予蚕丝织物自清洁与防污性能，利用多巴胺（DA）在CuSO4/H2O2氧化体系下快速聚合形成聚多巴胺（PDA）沉积在蚕丝表面，再通过十二烷基三甲氧基硅烷（DTMS）改性的纳米TiO2对沉积PDA的织物进行超疏水功能整理。通过FTIR、SEM、XPS、接触角测量仪对改性前后蚕丝织物的化学组成、表面微观结构、疏水性能进行表征；测试了改性蚕丝织物的自清洁与防污性、疏水自修复性和抗紫外线性能。结果表明，PDA/DTMS-纳米TiO2改性蚕丝织物表面具有分布均匀的微纳结构，且织物表面自由能下降；其静态水接触角为156°、滚动角为5°，防紫外线系数（UPF）为75.81，具有良好的防污自清洁能力和抗紫外线性能，透气性略有下降；经O2等离子体10次的刻蚀-修复循环或1200次机械磨损-修复循环后，织物的疏水修复率均大于96%，耐环境损伤的自修复效果明显。此外，洗涤25次后，PDA/DTMS-纳米TiO2改性蚕丝织物接触角为151°、UPF值为49.5，具有较为优异的耐洗牢度。

Abstract:

In order to impart self-cleaning and anti-fouling properties to silk fabric, firstly, polydopamine (PDA) was prepared by the polymerization of dopamine (DA) under CuSO4/H2O2 oxidation system and was deposited on the silk surface, and then the fabric was further superhydrophobically functionalized by dodecyltrimethoxysilane (DTMS) modified nano-TiO2. The FTIR, SEM, XPS, water contact angle measuring instruments were used to characterize the chemical composition, surface microstructure, and hydrophobic properties of silk fabric before and after modification. The self-cleaning and anti-fouling properties, self-repairing of hydrophobicity and UV resistance also were tested. The results showed that the PDA/DTMS-nano TiO2 modified silk fabric surface constructed uniformly micro and nano structure, as well as its surface energy reduced. The static contact angle of modified fabric was 156°, the rolling angle was 5°, and the UV protection factor was 75.81, so it had good anti-fouling self-cleaning ability and UV resistance. Its permeability slight decreased. When after 10 etching-repair cycles of O2 plasma or 1200 mechanical wear-repair cycles, the hydrophobic repair rate of the PDA/DTMS-nano TiO2 modified fabric was greater than 96%, and the self-healing effect of environmental damage resistance was obvious. In addition, after 25 washes, the contact angle of the modified silk fabric was 151° and the UPF value was 49.5, which still had relatively excellent washing fastness.