【作者】 吴海霞； 李蓓； 王亭杰； 金涌；

【Author】 Hai-Xia Wu,Li Bei,Ting-Jie Wang,Yong Jin (Department of Chemical Engineering,Tsinghua University,Beijing 100084,China)

【机构】 清华大学化工系；

【摘要】 研究了包覆过程中加料速率、搅拌速率及钛白粉固含率对包膜层形貌的影响,考察了含钛白粉漆膜的紫外老化特性.TEM检测结果表明,包膜过程中慢速加料、快速搅拌及高固含率有利于在钛白粉表面实现连续、均匀的膜状包覆.将包膜前、包膜后及杜邦R902钛白作为颜料,和苯丙乳液一起涂膜,进行紫外光老化实验,SEM检测结果表明,随紫外照射时间的延长,漆膜降解老化导致钛白粉颗粒逐渐裸露,漆膜粉化.色差检测结果表明,以连续、均匀硅铝二元包膜钛白为颜料粒子制备漆膜的抗紫外老化能力显著高于以未包膜钛白为颜料粒子制备的漆膜.实验表明,连续、均匀硅铝二元包覆膜层,在一定程度上能够屏蔽二氧化钛的光催化性能.更多还原

【Abstract】 The effects of feed rate,stirring speed and solid fraction of TiO₂ on the coating morphology were investigated,as well as the weatherability of the latex film filled with TiO₂ particles.TEM images showed that lower feed rate,higher stirring speed and higher fraction of TiO₂ were in the favor of forming a film coating on the particle surface.The non-coated,coated and R902 TiO₂ particles were filled in the styrene-acrylic latex to form a film,and the weatherability of the latex film against UV was studied.SEM images showed that the TiO₂ particles were uncovered with the degradation of the latex film under the UV light,causing the pulverization of the latex film.The chromatism results showed that the weatherability of the latex film filled with coated TiO₂ was remarkably increased compared with that filled with non-coated TiO₂ particles.It shows that the silica-alumina coating can seal the photo-catalysis of TiO₂ particle to a certain extent.更多还原