用超支化聚酯改善超细二氧化钛的分散稳定性  

Improvement of Stability of Ultrafine Titanium Dioxide Dispersion by Hyperbranched Polyester

作　　者：张新荔[1] 高治[1] 井新利[1] 

机构地区：[1]西安交通大学能源与动力工程学院化学工程系,西安710049

出　　处：《涂料工业》2009年第4期32-36,共5页Paint & Coatings Industry

摘　　要：以2,2-二羟甲基丙酸(DMPA)为原料,采用熔融缩聚反应合成了端羟基超支化聚酯(HBPE);通过与乙酸的酯化反应,将HBPE分子外围的羟基转化为酯基,明显改善了HBPE的溶解性能。以硅烷偶联剂KH550为桥梁,利用酰胺化反应将改性的HBPE(记做MHBPE)接枝到超细二氧化钛表面。红外光谱、元素分析和TG测试结果证明MHBPE成功接枝到超细二氧化钛表面。沉降实验和紫外可见光分析结果表明,接枝了MHBPE的超细二氧化钛在乙酸乙酯和四氢呋喃溶剂中有很好的分散稳定性。The hydroxyl terminated hyperbranched polyester （HBPE） was synthesized based on 2,2 - dimethylol propionic acid （DMPA） via a melt polycondensation. The peripheral hydroxyls of HBPE were transformed to terminal ester groups through esterification with acetic acid, to improve the solubility of HB- PE. By use of silane coupling agent KH550 the modified HBPE （MHBPE） was grafted onto the surface of ultrafine titanium dioxide by amidation reaction. The modified ultrafine titanium dioxide was characterized by FT- IR, elemental analysis and TG. The results indicated that MHBPE was successfully grafted onto the surface of ultrafine titanium dioxide. The results of sedmintation experiment and UV - vis analysis showed that the ultrafine titanium dioxide grafted with MHBPE gave a stable dispersion in ethyl acetate and tetrahydrofuran solvents.

关 键 词：超支化聚酯 端基改性 超细二氧化钛 表面改性 分散稳定性 

分 类 号：TQ630.4[化学工程—精细化工]