摘要： 以 2，2-二羟甲基丙酸(DMPA)为亲水扩链剂，聚四氢呋喃二醇(PTMG)和聚己二酯 1，4- 丁二醇酯(PBA)为软链段，异佛尔酮二异氰酸酯(IPDI)为硬链段，成功制备了固含量 50%以上低黏度 γ-氨丙基三乙氧基硅烷(KH-550)改性的水性聚氨酯(WPU)乳液。 对乳液和胶膜进行了物性表征和 研究，分析了 KH-550 改性 WPU 的作用机理。 实验发现当 KH-550 加入量为预聚体质量分数 2%时，其改性的 WPU 的综合物性最佳，此时乳液固含量在 50%左右，乳液粒径小于 130 nm，黏度低于 400 mPa·s;胶膜的拉伸强度大于 35 MPa，断裂伸长率大于 750%，吸水率低于 5%。

关键词: 水性聚氨酯, 羧酸型, 高固含量, γ-氨丙基三乙氧基硅烷

Abstract: A high solid content waterborne polyurethane(WPU) with low viscosity was synthesized from poly(1, 4-butylene adipate) glycol( PBA-1000) and polytetramethylene glycol(PTMG-1000) as soft segments, isophorone diisocyanate as hard segments, dimethylol propionicacid( DMPA) as hydrophilic chain extender. Then the WPU was modified with y-aminopropyltriethoxysilane (KH-550). The emulsion and film of WPU was analyzed by rotational viscometer, dynamic light scattering tester, electronic universal tensile machine , Fourier transform infrared spectrum, dynamic mechanical thermal analyses, thermo gravimetric analysis and atomic force microscope. The mechanism of KH-550 modified WPU was also ana- lyzed. When the content of KH-550 was 2 wt% of the prepolymer, the modified WPU exhibited the optimal comprehensive performance. Specifically, the solid content of the WPU was around 50%. The emulsion particle size was less than 130 nm. The viscosity was less than 400mPa.s. The water absorption of the film was less than 5%. The tensile strength was more than 35 MPa. The elongation at break was more than 750%.

Key words: waterbome polyurethane, carboxylic acid type, high solid content, y-aminopropyltriethoxysilane