防紫外线超疏水织物涂层构筑及性能

Performance and Construct of UV Blocking Superhydrophobic Fabric Coating

摘要:

以羟基氟硅油、季戊四醇三丙烯酸酯(PETA)为原料制备了含双键的聚氨酯，在整理液中添加紫外线吸收剂(UVA400)和纳米二氧化硅颗粒，以提高涂层的紫外线防护效果和表面粗糙度，通过紫外光引发双键自由基聚合构筑防紫外超疏水织物涂层。FTIR和SEM分析结果表明：羟基氟硅油和PETA引入到了聚氨酯分子链中；织物表面具有微纳米状凸起，形成了粗糙的表面涂层。涂层织物的疏水性和紫外线防护性测试结果表明：当整理液固体组分中w(SiO2)=15.0%，w(UVA400)=1.5%时，涂层织物的接触角为154°，滚动角为9°，紫外线防护系数(UPF)为72，紫外线A(UV-A)波段的透过率为2.96%，具有超疏水和紫外线防护性能；涂层织物经120h加速老化实验后，接触角为155°，UPF为117，UV-A波段的透过率为2.68%，具有良好的耐久性。

Abstract:

Polyurethanes with double bonds were prepared by hydroxy fluorosilicone oil, Pentaerythritol triacrylate(PETA) as a raw material. The ultraviolet absorbers(UVA400) and nanosilica particles were added to the finishing solution to improve the UV protection and surface roughness of the coating. The ultraviolet(UV) blocking and superhydrophobicity fabric coating was fabricated by UV light initiate double bond radical polymerization. FTIR and SEM analysis show that fluorosilanes and PETA are introduced into the polyurethane molecular chain. The surface of the fabric has micro-nano-shaped projections, and the rough surface coating was constructed. Hydrophobic and UV protective tests of coated fabrics show that the coated fabric with excellent superhydrophobicity and UV protection performance when w(silicon dioxide)=15.0% and w(UVA400)=1.5%, the coated fabric has a water contact angle of 154°, roll angle of 9°, ultraviolet protection factor(UPF) value of 72, and transmittance of ultraviolet A(UV-A)band was 2.96%. And the coated fabric after accelerated aging test 120h, the contact angles was 155°, the UPF values was 117, the transmittance of the UV-A band was 2.68%, respectively, and with excellent durability.