复合包装用无溶剂型聚氨酯胶黏剂的制备及性能研究

Preparation and Performance Study of Solvent-free Polyurethane Adhesive for Composite Packaging

本课题选用低分子量聚丙二醇(PPG1000)与二异氰酸酯(TDI、MDI、IPDI)为原料,制备无溶剂型聚氨酯胶黏剂应用于纵向拉伸聚丙烯(MOPP)的复合中,研究了反应时间、反应温度、异氰酸酯(NCO)与羟基(OH)的摩尔比即R值以及异氰酸酯种类对聚氨酯胶黏剂合成和性能的影响。研究发现,聚氨酯在反应时间为150 min,反应温度为70℃的条件下合成最佳;R值(异氰酸酯基与羟基的物质的量之比)越大则初始黏度和平均剥离力越小;异氰酸酯中TDI的使用性能最佳。

This study selected low molecular weight polypropylene glycol(PPG1000)and diisocyanate(TDI,MDI,IPDI)as raw materials to prepare solvent-free polyurethane adhesive for the composite of longitudinally stretched polypropylene(MOPP).The effects of reaction time,reaction temperature,the molar ratio of isocyanate(NCO)to hydroxyl(OH),i.e.R value,and the type of isocyanate on the synthesis and performance of polyurethane adhesive were studied.Research has found that polyurethane is best synthesized under the conditions of reaction time of 150 minutes and reaction temperature of 70℃;The larger the R value(the ratio of the amount of isocyanate group to hydroxyl group),the smaller the initial viscosity and average peeling force;TDI has the best performance among the isocyanates.