摘要： 为研究水性聚氨酯折光率对涂膜光泽的影响，以普通含硫小分子二元醇为扩链剂， N，N-二甲基甲酰胺（ DMF）为催化剂，与聚醚多元醇、二异氰酸酯、二羟甲基丙酸反应合成了含硫高折光率的水性聚氨酯。采用激光粒度仪、紫外 -可见分光光度计、阿贝折光仪、光泽度仪、电子万能材料试验机、热重分析仪等对分散体的粒径和涂膜的透光率、折光率、光泽、力学性能、热性能等进行了分析。探究了含硫单体种类及其含量对涂膜折光率与阿贝数的影响，特别是含硫单体含量对薄膜力学性能、热稳定性的影响以及对透光率、光泽等光学性能的影响。结果表明：水性聚氨酯涂膜的折光率随着含硫单体的引入得到提高，并随着含硫单体用量的增加而增加，表现出较为优异的透光率与光泽。

关键词: 水性聚氨酯, 含硫扩链剂, 光学性能, 折光率, 光泽

Abstract: In order to study the effect of the refractive index of waterborne polyurethane onthe gloss of coating film，aqueous polyurethane with high refractive index was synthesized by thereaction of polyether polyol，diisocyanate and dimethylol propionic acid with common sulfur-containing small molecule dihydric alcohol as chain extender and DMF as catalyst. The particlesize of the dispersion，the transmittance，refraction，gloss，mechanical and thermal properties of the film were analyzed by laser particle size meter，UV-visible spectrophotometer，Abbe refraction meter，electronic universal material testing machine and thermogravimetric analyzer.The effects of the types and contents of sulfur-containing monomers on the refractive indexand Abbe number of the films，especially the effects of the amount of sulfur-containingmonomers on the mechanical properties of the films，the thermal stability of the films，and the optical properties such as light transmittance and gloss of the films，were investigated. Theresults showed that the introduction of sulfur-containing monomers improved the refractive index ofthe waterborne polyurethane coating film and exhibited excellent transmittance and gloss. 

Key words: waterborne polyurethane, sulfur-containing chain extender, optical property, refractive index, gloss

中图分类号: 

• TQ630. 4