摘要： 以异佛!酮二异氰酸酯（IPDI）、聚醚二元醇（PTMG）及二羟甲基丙酸（DMPA）为主要原料，合成了聚氨酯预聚体，并引入含酮羰基的双羟基化合物（DDP）与预聚体进行交联，再加入 3-氨丙基三乙氧基硅烷（KH550）改性，合成了稳定的高交联度脂肪族水性聚氨酯。采用傅里叶变换红外光谱（FT-IR）和热质分析（TG）对水性聚氨酯的结构进行了表征，并对胶膜的耐介质性、热稳定性和机械性能进行了测试。结果表明：经 KH550改性的 WPU综合性能明显提高。当 KH550含量由 0增加到 10%时，拉伸强度由 20MPa增加到 27MPa，断裂伸长率从 330%降至 198%，吸水率由432%降至 213%，吸丙酮率亦由 47.5%降至 26.2%。FT-IR测试结果显示，KH550和DDP成功引入聚氨酯分子链上，实现了化学改性。TG分析表明，改性的水性聚氨酯耐热性明显提高。

关键词: 水性聚氨酯, 硅烷偶联剂, 改性, 性能

Abstract: A waterborne polyurethane prepolymer was prepared by the reaction of isophorone diisocyanane(IPDI), polyether polyol ( PTMG1000 ) and dimethylol propionic acid(DMPA), which was then crosslinked with ketone carbonyl containing dihydroxy compound and modified with 3-aminopropyltriethox silane(KH550 )to synthesize a stable highly crosslinked aliphatic aqueous polyurethane. The structure of the polyurethane was characterized by FTIR, TG and the solvent resistance, thermal stability and mechanical properties of the PU films were also measured. The results showed that the overall performance of WPU modified with the KH550 was improved significantly. As the mass fraction of KH550 increases from 0 to 10%, the tensile strength of PU films inereased from 20 MPa to 27 MPa and elongation at break from 330% to 198%. Water absorption decreased from 43. 2% to 21. 3% and ethanol absorption decreased from 47. 5% down to 26. 2%. FTIR indicated that KH550 and DDP were successfully introduced into polyurethane molecular chain by chemically. TG analysis showed that heat resistance of waterborme polyurethane modified by KH550 was improved.

Key words: waterborne polyurethane, silane coupling agent, modification, property