纳米二氧化钛表面改性及其在聚氨酯涂层中的分散性质

The Surface Modification of Nano-TiO_2 and Its Distribution in Polyurethane Coatings

采用长链烷烃和微胶囊方法对纳米TiO2（锐钛型,粒径20nm）进行表面改性,利用傅里叶红外光谱（FTIR）和热重分析（TGA）分别研究了改性纳米粉体的表面化学结构及接枝率,结果表明：改性纳米TiO2粉体表面成功接枝了高分子聚合物,接枝率分别为5%和12%。将改性纳米TiO2粉体（质量分数为1%-3%）与双组分聚氨酯涂料进行复合,制备了纳米TiO2/聚氨酯复合涂料,并利用扫描电子显微镜（SEM）对纳米复合涂层进行了微观检测,结果表明：微胶囊改性的纳米TiO2在涂层中的分散性最好。

The surface of nano-TiO2 （ anatase, particle diameter 20nm） was modified by long-chain crocapsule, which was characterized by fourier trnsform infrared ray （ FTIR ） and thermal analysis （ TGA ） show that the modified nano-TiO2 particles have been grafted by macromolecular polymers, with the alkane or migrafting The results degrees of 5% and 12%, respectively. The modified nano-TiO2（1% -3% ）was blended with polyurethane resins to obtain nano-TiO2/polyurethane composite coating, which were further studied by scanning electron microscopy（SEM）. The results show that nano-TiO2 which was modified by microcapsule has the best dispersibility.