摘要
文采用HDI、聚环氧丙烷二醇、二羟甲基丙酸和封端剂乙二醇等为原料通过预聚法合成水性聚氨酯,并对其成膜性进行了力学分析.通过比较,最佳制备工艺：在40℃时向聚环氧丙烷二醇中缓慢加入HDI,80℃预聚1 h,加催化剂再反应1 h降温至75℃,加DMPA反应2 h,再封端反应1 h,降温至35-40℃加入TEA乳化30 min.交联剂相对含量的提高,可以提高聚氨酯膜的强度和韧性.
The waterborne polyurethane was prepared from 1,6-Hexamethylene Diisocyanate（HDI）,Polypropylene Glycol（PPG）,Dimethylol propinic acid（DMPA） and Ethylene Glycol（EG）.The research for film-forming property of the product has been conducted.By comparison,the optimum preparation process is： HDI is added slowly into PPG at 40℃ firstly.Then the temperature rises to 80℃ and holds at that temperature for 1h.Catalyst is added and hold at that temperature for 1h,then DMPA is added and hold at 75℃ for 2h.Block the prepolymer after that for 1h.,then TEA is used to emulsify at 35～40℃ for 30min.Improving relative content of crosslinking agent increases strength and toughness of polyurethane film.
基金
安徽省高校自然科学研究基金资助项目(2008kj160)
安徽工程大学人才引进基金资助项目(2007yqQ001)
安徽工程大学青年科研基金资助项目(2009yq029)
关键词
水性聚氨酯
封端
合成
成膜性
waterborne polyurethane
termination
synthesis
film-forming property
