超疏水气凝胶涂层超高分子量聚乙烯织物的制备与表征

为提高超高分子量聚乙烯织物的疏水性能，基于荷叶效应原理，采用涂层方法在织物表面构筑纳米微米结构。将二氧化硅气凝胶分散于聚偏氟乙烯（PVDF）溶液中制成涂层液，并对超高分子量聚乙烯织物进行涂层处理。借助Ｘ 射线光电子能谱仪、扫描电子显微镜、原子力显微镜等测试织物表面的化学组成及微结构，并采用集灰实验测定织物的自清洁性能。结果表明：当PVDF质量分数为12%、二氧化硅气凝胶质量分数为8% 时，涂层织物表面的最大接触角为157.8°，滚动角为3°；涂层膜表面有微米级突起和纳米级颗粒状突起；水滴可将涂层后织物表面的污物带走，织物具有良好的自清洁效果。

Preparation and characterization of super hydrophobic aerogel coated ultra-high molecular weight polyethylene fabric

In order to improve the hydrophobicof ultra-high molecular weight polyethylene fabric, micro- and nano-scale structures were built by coating the fabric surface based onthe lotrs effect.Silica aerogel was dispersed in polyvinylidene fluoridefor preparing coating solution, andultra-high molecular weight polyethylene fabric was coated by the solutio. The chemical composition and microstructure ofthe fabric surface were deteced by a X-ray photoelectron spectrograph, a scanning electron microscope and an atomic force microscope. The self-cleaning properties of the fabric were mearsured by the ash collection test.The results show that when themass fraction of PVDF is 12% and that of the silica aerogel is 8%, the maximum contact angel of the coated fabric surface is 157.8°, and the rolling angel is 3°. The coated film surface hasmicro-scale projections andnano-scale particle projections. Stain on the coated fabric surface can be taken away by water droplets, so the fabric surface has excellent self-cleaning property.