湿固化聚氨酯胶粘剂自然陈化过程中氢键作用的研究  

Study on Hydrogen Bonding of Moisture-curable Polyurethane Adhesive during Natural Aging

作　　者：石红翠 宋利青 张博 毛祖秋 姚卫琴 马国章 SHI Hong-cui;SONG Li-qing;ZHANG Bo;MAO Zu-qiu;YAO Wei-qin;MA Guo-zhang(Shanxi Institute of Applied Chemistry(Co.,Ltd.),Shanxi Key Laboratory of Coating Polymer Functional Materials,Taiyuan 030027,China)

机构地区：[1]山西省应用化学研究所(有限公司),涂装高分子功能材料山西省重点实验室,太原030027

出　　处：《高分子通报》2021年第8期36-43,共8页Polymer Bulletin

基　　金：山西省科技重大专项(20181101012);山西省重点研发计划(高新领域)项目(201903D121113);山西省应用基础研究项目(201801D221112)。

摘　　要：采用聚氧化丙烯二醇(PPG)、二苯基甲烷二异氰酸酯(MDI-50)、1,4-丁二醇(BDO)及二月桂基二丁基锡(T-12),双吗啉基二乙基醚(DMDEE)与自制复合催化剂,获得3种不同催化剂作用下的湿固化聚氨酯胶粘剂。通过FTIR对自然陈化过程中氨酯羰基氢键化和脲羰基氢键化进行分析,采用T-剥离测试陈化过程粘结强度。结果表明,陈化过程中,随着游离氨酯羰基减少,氢键化氨酯羰基增多,而游离脲羰基与氢键化脲羰基没有明显的相关性。使用T-12、DMDEE,随着陈化时间延长,聚氨酯胶粘剂微相分离程度增强,总氢键化程度增大,而使用复合催化剂,作用相反。聚氯酯胶粘剂粘结强度与总氢键化程度及氢键化脲羰基相关。A number of moisture-curable urethane prepolymers(MCPU)were synthesized by propyleneglycol(PPG),4,4′-diphenylmethane diisocyanate(MDI-50),1,4-butanediol(BDO),using Lauryl dibutyltin(T-12),2,2-dimorpholinodiethylether(DMDEE),self-made composite catalyst, respectively. Fourier transform infrared spectroscopy was used to characterize the assignment of hydrogen bonds of urethane carbonyl groups and urea carbonyl groups during natural ageing in MCPUs. In addition, the adhesion strength of the cured polyurethane adhesive was determined by tensile shear strength test. The result showed that natural ageing the number of hydrogen bonding urethane groups was raised with the decrease of free urethane groups, no significant relationship free urea carbonyl groups and hydrogen bonding urea groups. Total hydrogen bonding was increased by one kind of catalyst(T-12, DMDEE)nature ageing processes, at the same time microphase separation was promoted. Or reduced by self-made composite catalyst. The adhesion strength was correlation between total hydrogen bonding degree and hydrogen bonding urea groups.

关 键 词：湿固化 聚氨酯胶粘剂 催化剂 自然陈化 氢键作用 

分 类 号：TQ433.432[化学工程]