含双键的TMPME用量对水性聚氨酯性能的影响

Effect of Double-bond-contained TMPME Dosage on Properties of Waterborne Polyurethane

采用聚丙二醇(PPG)、异佛尔酮二异氰酸酯(IPDI)、4,4′-二苯基甲烷二异氰酸酯(MDI)、三羟甲基丙烷单烯丙基醚(TMPME)、2,2-二羟甲基丁酸(DMBA)等原料合成了不同TMPME用量的水性聚氨酯(WPU);采用过硫酸铵(APS)引发TMPME中双键反应得到交联后的水性聚氨酯(Crosslinked WPU,CWPU)。考察TMPME用量对WPU和CWPU胶膜力学性能、耐水性及耐热性等的影响。结果表明:随着TMPME用量的增加,CWPU拉伸强度、形变回复率与接触角逐渐增加,断裂伸长率与吸水率逐渐降低。

Waterborne polyurethanes(WPUs)with different amounts of TMPME were synthesized using polyoxypropylene glycol(PPG),isophorone diisocyanate(IPDI),4,4′-diphenylmethane diisocyanate(MDI),trimethylolpropane monoallyl ether(TMPME)and 2,2-bis(hydroxymethyl)butyric acid(DMBA)as raw materials.Ammonium persulfate(APS)was used to initiate the double bond reaction in TMPME to obtain CWPU.The effects of TMPME content in the mechanical properties,water resistance and heat resistance of WPU and CWPU films were investigated.The results showed that,with the increase of TMPME content,the tensile strength,deformation recovery rate and contact angle of CWPU increased gradually,while the elongation at break and water absorption rate decreased.