细乳液法合成无溶剂水性聚氨酯

Synthesis of Solvent-free Waterborne Polyurethane by Microemulsion Method

以聚丙二醇(PPG-1000)、4,4-二环己基甲烷二异氰酸酯(HMDI)、二羟甲基丙酸(DMPA)、三乙胺(TEA)、聚四氢呋喃醚二醇(PTMG650)、1,4-丁二醇(BDO)以及液体石蜡(CS)为主要原料,PTMG650为反应型助稳定剂并改变其用量,采用细乳液法合成了一系列无溶剂水性聚氨酯(WPU),并研究了反应型助稳定剂的比例对水性聚氨酯性能的影响。结果表明,随着PTMG650比例的增加,聚氨酯胶膜分子链的柔顺性越来越好;胶膜的拉伸强度从26.7 MPa降低到7.2 MPa,杨氏模量从144.4 MPa降低到19.8 MPa。此外,所有胶膜具有良好的耐热性和耐水性。

In this study,polypropylene glycol(PPG-1000),4,4-dicyclohexylmethane diisocyanate(HMDI),dihydroxymethylpropionic acid(DMPA),triethylamine(TEA),polytetrahydrofuran ether diol(PTMG650),1,4-butanediol(BDO)and liquid paraffin wax(CS)were used as the main raw materials,and PTMG650 was used as a reactive co-stabilizer and its dosage was varied.A series of solvent-free waterborne polyurethanes(WPU)were synthesized by the microemulsion method,and the effect of the ratio of reactive co-stabilizers on the properties of WPU was investigated.The results show that with the increase of PTMG650 ratios,the molecular chain of polyurethane films become more and more flexible.The tensile strength of the films decreases from 26.7 MPa to 7.2 MPa and the Young s modulus decreases from 144.4 MPa to 19.8 MPa.In addition,all the films have excellent thermal and water resistance.