摘要
以阳离子共聚合的方法,通过改变四氢呋喃(THF)和环氧氯丙烷(ECH)的配比,调整起始剂用量,合成出系列数均相对分子质量在2 000左右的端羟基共聚醚.以此端羟基共聚醚作为软段,合成出系列改性的水性光固化聚氨酯乳液,用FTIR验证产物结构.结果表明:随着环氧氯丙烷配比的增加,软段中强极性卤素原子增多,乳液储存稳定性良好,固化膜的拉伸强度由4.6 MPa逐渐增加至6.7 MPa,断裂伸长率从162%降至113%,热稳定性逐渐变好,当THF和ECH的配比提高到1∶1时,5%,10%的失重温度分别为200℃和275℃,比改性之前的5%,10%失重温度164℃,220℃提高了36℃和55℃;涂层的附着力显著提高至1级,硬度也有所增加,耐冲击性能优异.
Series of the hydroxyl-terminated co-polyethers whose molecular weight is around 2 000 were synthesized by controlling the rate of THF and ECH and the dosage of initintor.Varied types of modified UV curable waterborne polyurethane emulsions were synthesized by using the co-polyethers acting as soft segment,and the corresponding product structures were characterized by using FTIR.The results have shown that：with the increasing ratio of epoxy chloropropane,the strong polarity halogen atoms in the soft segment increases while the tensile strength of curable film changes from 4.6 MPa to 6.7 MPa and the elongation at break reduces from 162%to 113%.When the ratio of THF and ECH grows to be 1∶1,the weightlessness temperature of 5%and 10%increases from 164℃to 200℃and 220℃to 275℃.In addition,the adhesion of the coating significantly increases to 1level,also the hardness and impact resistance performance improves.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第6期89-92,共4页
Journal of Hunan University:Natural Sciences
关键词
耐热性能
UV固化水性聚氨酯
端羟基聚醚
软段改性
heat resistance
UV-curable waterborne polyurethane
hydroxyl-terminated polyether
soft segment modified
