摘要： 对纳米SiO₂和TiO₂进行了TDI(HDI)和PEG的接枝改性,并采用共混法制备了纳米改性水性聚氨酯乳液,电镜观测表明改性后的纳米粒子在乳液中分散均匀,无团聚现象。纳米粒子改性后的水性聚氨酯乳液力学性能比未改性前得到改善和提高,纳米粒子添加量为0.5%时,水性聚氨酯乳液的力学性能最佳,同时吸水率降低了70%,添加的纳米粒子对290~400 nm的紫外光有吸收。

关键词: 纳米粒子, 水性聚氨酯, 力学性能, 吸水率, 紫外吸收

Abstract: Nano-SiO₂ and nano-TiO₂were respectively modified by TDI(HDI)and PEG. Nano-particles/waterborne polyurethane emulsion were prepared by blending method. SEM test showed that nanoparticles were well dispersed with no agglomerates. The mechanical properties were improved after modification with nanoparticles. When the contents of SiO₂ and TiO₂ were up to 0. 5%, the waterbome polyurethane can provide the best mechanical properties, and the water absorption downed by 70%. The nanoparticle shows ultraviolet absorbtion at the wavelength of 290-400 nm.

Key words: nanoparticles, waterborne polyurethane, mechanical properties, water absorption, UV absorption