硅烷偶联剂改性水性聚氨酯胶黏剂

摘要

以聚已二酸－1,4－丁二醇酯( PBA2000)、甲苯二异氰酸酯(TDI)、二羟甲基丙酸(DMPA)和一缩二乙二醇(DEG)为原料合成了一种聚氨酯预聚体,通过在预聚体中引入可室温交联的硅烷偶联剂,制备得到了一种单组份自交联的水性聚氨酯胶黏剂.探讨了硅烷偶联剂加入方式,用量对乳液及胶膜性能的影响.结果表明:当硅烷偶联剂用量为预聚体质量分数的1.5％时,胶黏剂对塑料薄膜PET/CPP的粘接强度显著提高,由改性前的1.3 N/15mm增大至1.7 N/15 mm；复合薄膜经过沸水煮后,T剥离强度由1.0 N/15 mm变为1.5 N/15 mm.%A polyurethane prepolymer has been synthesized using polybutyleneglycol adipate ( PBA2000) , toluene-2,4-diisocyanate (TDI), dimethylolpropionic acid (DMPA) and diethylene glycol (DEG) as starting materials, and single-package self-crosslinked waterborne polyurethane adhesives were subsequently obtained by introduction of an ambient cross-linking silane coupling agent. The effects of varying the means of addition and content of the si-lane coupling agent were investigated. The results indicated that the adhesive strength increased from 1. 3 N/15 mm for the unmodified polyurethane to 1. 7 N/15 mm when the content of silane coupling agent was 1. 5% . The T-peel strength increased from 1. 0 N/15 mm to 1. 5 N/15 mm after the laminated films were boiled.