摘要
本文以聚氨酯、钛酸四丁酯(TNB)、三乙胺、乙醇为主要原料,采用原位法制备了聚氨酯-二氧化钛(PU-TiO2)水分散复合物,利用紫外分光光度法分析了PU-TiO2复合物反应时间,热重-差热与XRD射线衍射表征PU-TiO2复合物动力学变化和粒子晶型变化,透射电镜(TEM)、动态光散射技术(DLS)与扫描电镜(SEM)分别观察与表征了复合分散体的粒径大小、分布及PU-TiO2复合物膜的表面形态,结果显示PU-TiO2水分散复合物(R4'=0.3)平均粒径为197.4nm,具有良好的稳定性和光学透明性;复合物的热稳定得到改善,晶相的形成受到阻碍,PU-TiO2复合物膜摆杆硬度和耐冲击强度得到较大提高,选择R4'=0.1为佳。
Aqueous polyurethanes (PU) and K600 were coated on the surface of titania (TiO2) particles by in situ methodusing titanium butyrate(TNB), triethylamine (TEA), ethyl alcohol and water as raw materials. UV spectrophotometry wasapplied to analyze the reaction time .TG-DTA and XRD characterized PU- TiO2 crystal phase in different temperature. Thesurface morphology and properties of composite particles and membranes were observed by means of transmission electronmicroscope (TEM), scanning electron microscope (SEM),dynamic light scattering (DLS) techniques. The results demon-strated that average particle size of PU-TiO2 composites was 197.4nm and the composites system had good stability andtransparency. At the same time, system heat stability was improved;, crystal phase process was encumbered , but PU-TiO2films (containing K600) were dense, homogeneous. The pendulum hardness and impact intensity of PU-TiO2 films wereobviously improved. It was better to choose the condition of R4'=0.10.
出处
《化学建材》
北大核心
2004年第3期8-12,共5页
Chemical Materials for Construction
基金
2003年国家级火炬计划项目(2003EB030102)
关键词
二氧化钛
水性聚氨酯
稳定性
复合物
三乙胺
titanium dioxide,aqueous polyurethanes,stability,composite,surface morphology
