PET薄膜用水性聚氨酯胶黏剂的制备

摘要

以聚对苯二甲酸-3-甲基-1,5-戊二醇酯二醇(TPA-1000)、聚乙二醇(PEG-2000)为软段、异佛尔酮二异氰酸酯(IPDI)、一缩二乙二醇(DEG)、2,2-二羟甲基丙酸(DMPA)为硬段,合成了一系列水性聚氨酯胶黏剂,用于PET薄膜的粘接.用傅里叶变换红外光谱(FTIR)表征了聚氨酯的结构,同时对聚氨酯胶膜进行了拉伸、耐水性、DSC和T型剥离等测试.结果表明,随着聚乙二醇含量的减少,大大增加了胶膜的力学性能和耐水性能,胶膜的热稳定性能有所提高,粘接强度先增加后减小,质量比TPA-1000:PEG-2000=1:1时,T型剥离强度达到最大值4.55 N/25 mm.%A series of waterborne polyurethane adhesive for PET film were synthesized using poly -to-ben-zene-two-methyl anhydride-3-methyl-1,5-pentanediol ester glycol(TPA-1000)and polyethylene glycol (PEG-2000)as soft segments,isophorone diisocyanate(IPDI),diethylene glycol(DEG)and 2,2-dimethylol propionic acid(DMPA)as hard segments.They were using for PET films bonding.The structure of polyurethane films were characterized by Fourier transform infrared spectroscopy(FTIR).At the same time, the polyurethane films was subjected to tensile test,water resistance test,differential scanning calorimetry (DSC)and T type stripping test.The results show that with the decrease of the content of polyethylene glycol,the mechanical properties and water resistance of the films increase greatly;The thermal stability of the films increase and the bond strength increase first and then decrease.The results show that when the mass ratio TPA-1000:PEG-2000=1:1,the bonding strength reach a maximum of 4.55 N /25 mm.