水性聚氨酯丙烯酸酯乳液的制备及性能

目的制备丙烯酸酯改性水性聚氨酯乳液,研究内交联剂对其性能的影响。方法以聚氨酯为种子乳液,以三羟甲基丙烷单烯丙基醚(TMPME)为扩链剂和内交联剂,以甲基丙烯酸甲酯(MMA)及丙烯酸酯丁酯(BA)为丙烯酸酯单体,制备丙烯酸酯改性的水性聚氨酯(WPUA),研究TMPME用量对WPUA及其胶膜性能的影响。结果当TMPME质量分数为3%时,乳胶膜的吸水率可降至7%;对乳胶膜进行热处理可进一步提高膜的耐水性;当TMPME质量分数为2%时,乳胶膜的拉伸强度可提高至8.7MPa,断裂伸长率升高至620%,综合性能最佳。结论引入一定量的TMPME,可以提高WPUA中分子的交联度和膜的致密性,从而显著改善乳胶膜的耐水性和力学性能。

Preparation and Properties of Acrylate Modified Waterborne Polyurethane Emulsion

The work aims to prepare acrylate modified waterborne polyurethane emulsion and study the effects of inner-crosslinking agent on the performances of such emulsion. The waterborne acrylate-polyurethane (WPUA) was prepared with polyurethane as the seed emulsion, trimethylolpropane monoallyl ether (TMPME) as the chain extender and intramolecular crosslinking agent, and methyl methacrylate (MMA) and butyl acrylate (BA) as the acrylate monomer. The effects of dosage of TMPME on the properties of the emulsion film were studied. The water absorption of the emulsion film could be reduced to 7.0% when the mass fraction of TMPME was 3%. In addition, heat treatment was beneficial to improve the water resistance of emulsion film. The tensile strength of emulsion film could be increased to 8.7 MPa and the elongation at break can be increased to 620% when the mass fraction of TMPME was 2%. At this time, the comprehensive performance was the best. The introduction of a certain amount of TMPME can improve the molecular crosslinking degree and film compactness in WPUA, thus significantly improving the water resistance and mechanical property of the emulsion film.