基于端羟基聚丁二烯聚氨酯型UV减粘胶的合成与性能

Synthesis and Characterization of UV Adhesion-Reducing Adhesives Based on Hydroxy-Terminated Polybutadiene Polyurethane

先以端羟基聚丁二烯与异佛尔酮二异氰酸酯反应,然后以1,4-丁二醇或1,4-丁烯二醇为扩链剂进行扩链,控制主链中C=C含量,并添加二官能度或三官能度的丙烯酸酯交联单体,制备了聚氨酯型紫外(UV)减粘胶。采用傅里叶变换红外光谱表征了减粘胶的分子结构;考察了交联程度对减粘效果的影响。结果表明,随着减粘胶交联密度、凝胶率的增加,减粘胶的体积收缩率增大,进而表面粗糙度增加,减粘效果明显。当以1,4-丁烯二醇为扩链剂、三羟甲基丙烷三丙烯酸酯(TMPTA)为可交联单体所得的减粘胶UV照射前的剥离力达19 N/25 mm,UV照射后的剥离力降低至0.2N/25 mm,满足使用要求。

Polyurethane UV adhesion-reducing adhesives were prepared by hydroxyl terminated polybutadiene which reacted with isophorone diisocyanate firstly,and then 1,4-butanediol or 1,4-butenediol was used as chain extender to expand the chains and control the content of C=C in the main chains,and two or three functional acrylate was used as crosslinking monomer monomer.The molecular structure of the adhesion-reducing adhesives was characterized by Fourier transform infrared spectroscopy(FT-IR).The effect of cross-linking degree on adhesionreducing was investigated.The experimental results show that with the increase of the cross-linking density and the gel ratio of the adhesion-reducing adhesives,the volume shrinkage of adhesive increases,and then the surface roughness increases,and the adhesion-reducing effect is obvious.When 1,4-butenediol is used as chain extender and trimethylolpropane triacrylate(TMPTA) is used as crosslinkable monomer,the peeling strength reaches 19 N/25 mm before UV irradiation,and decreases to 0.2 N/25 mm after UV irradiation,which meets the application requirements.