聚丙烯酸酯改性水性聚氨酯的制备及性能

Preparation and performance of polyacrylate modified waterborne polyurethanes

以聚醚二元醇N210、甲苯二异氰酸酯(TDI)为主要原料,二羟甲基丙酸(DMPA)为亲水扩链剂,三乙胺为成盐剂按逐步聚合原理合成聚醚型水性聚氨酯(WPU);再经与Tg为–11℃或–33℃的聚丙烯酸酯(PA)的乳液反应或共混,制备了PA改性的WPU(PUA)共聚(共混)乳液。讨论了聚醚型WPU和Tg为–11℃或–33℃的PA的乳液的比例(m(WPU)∶m(PA))对PUA共聚乳液黏度以及PUA共聚(共混)薄膜的力学性能和耐溶剂性能的影响。

The polyether-based waterborne polyurethane （WPU） was prepared by using polyether diol N210 and toluene diisocyanate （TDI） as main raw materials, dimethylol propionic acid （DMPA） as hydrophilic chain extender and triethylamine as salt-forming agent in accordance with the stepwise polymerization principle. The polyacrylate （PA） modified WPU （PUA） copolymerization （blend） emulsions were prepared by the reaction or blending of WPU with PA （Tε= -11 ℃ or -33 ℃） emulsions. The influence of PA （Tg=-11 ℃ or -33 ℃） emulsions and polyether-based WPU ratio （m（WPU） ： m（PA）） on viscosity of the PUA copolymerization emulsion and the mechanical performance and solvent resistance of the PUA copolymerization （blend） films was investigated.