纳米TiO2晶型对合成革用阴离子水性聚氨酯性能的影响

The Affect of Crystal Nano-TiO2 on Performance of negative ion Water-borne Polyurethane used by synthetic leather

摘要:

用纳米微粒直接分散法制备了纳米TiO2/水性聚氨酯复合膜，考察了纳米TiO2晶型（金红石型和锐钛矿型）对复合膜性能的影响。粘度分析表明：金红石型纳米TiO2增粘效果较好。粒径、SEM和AFM分析表明：添加纳米TiO2不影响聚氨酯乳液的稳定性，复合粒子仍然以纳米级存在，两种晶型的纳米TiO2均能均匀分散于复合膜中，并对复合膜表面的平整度无影响；接触角和卫生性能测试表明：两种晶型的复合膜都没有防水性，添加锐钛矿型纳米TiO2复合膜的卫生性能较好；机械性能和抗菌性测试表明：添加锐钛矿型纳米TiO2的复合膜具有更好的力学性能和抗菌性能。

Abstract:

By dispersing nano-particle directly to get nano-TiO2/WPU composite membrane, meanwhile, we observed the affect of performance which added to crystal nano-TiO2(rutile and anatase type) on the composite membrane. The analysis of viscosity showed the rutile type had better effects on the increase of viscosity. The analyses of grain diameter showed that there were no differences on the stability of polyurethane-emulsion whether adding nano-TiO2 or not, and the composite particle still existed as the state of nanoscale, still, both type of rutile and anatase nano-TiO2 dispersed uniformly in composite film and had no effects on the flatness of it. The contacting angle and hygiene performance tests indicated that both crystal-size of composite film had no water-proof properties, the one which added anatase type had better hygiene function; the mechanical and anti-bacterial tests manifested the one added anatase type had better mechanical and anti-bacterial properties.