文献类型：专利

英文题名：Preparation of aqueous polyurethane elastomer emulsion for films, involves reacting diisocyanate, polyhydroxy compound, hydroxycarboxylic acid, and tin catalyst, adding chain extender, neutralizing, and adding crosslinker and water

作者：YANG J;WU Q;WANG Y;MA X

机构：[1]UNIV EAST CHINA SCI&TECHNOLOGY;[2]SHANGHAI HUAMING HI TECH GROUP CO LTD

申请号：CN102358777-B

公开日：2012-09-19

语种：英文

收录：DERWENT

摘要：NOVELTY - An organic diisocyanate, a polyhydroxy compound, a hydroxyl-containing carboxylic acid, and an organic tin catalyst are reacted. A chain extender with active hydrogen is added and reacted till the theoretical residual isocyanate content is reached. A polyhydroxy chain terminator is added to remove residual isocyanate. An organic amine is added for neutralization. A crosslinker and water are added to obtain an aqueous polyurethane elastomer emulsion. USE - Preparation of aqueous polyurethane elastomer emulsion for films (all claimed). ADVANTAGE - The method provides aqueous polyurethane elastomer emulsion having low modulus, and excellent yellowing resistance and storage stability. DETAILED DESCRIPTION - An organic diisocyanate, polyhydroxy compound having a molecular weight of 600-4000, a hydroxyl-containing carboxylic acid, and an organic tin catalyst are reacted for 2-5 hours at 60-90 degrees C. A chain extender with active hydrogen is added and reacted till the theoretical residual isocyanate content is reached. A polyhydroxy chain terminator is added to remove residual isocyanate. An organic amine is added at 30-35 degrees C for neutralization at a degree of 70-100 mol% with respect to hydroxyl-containing carboxylic acid. A crosslinker and water are added to obtain an aqueous polyurethane elastomer emulsion.