粒料法合成高固含量聚氨酯分散体胶粘剂

以聚己二酸1,4-丁二醇酯(PBA-3000)为软段、异佛尔酮二异氰酸酯(IPDI)、1,4-丁二醇(BG)为硬段、聚醚二元醇磺酸盐(SPPG)作为亲水单体,采用本体聚合方法合成了聚氨酯离子聚合物。聚氨酯离子聚合物经造粒、丙酮溶解、水分散、去丙酮得到固含量为50%的高固含量聚氨酯分散体胶粘剂。研究了硬段含量、分子量对分散体平均粒径和粒径分布、胶膜的热学性能以及粘合性能的影响。聚氨酯分散体胶粘剂的最高初粘力为6N/mm,最高剥离强度为10.24 N/mm。

Synthesis of High Solid Content Polyurethane Dispersion Adhesive by Pellet Process

Polyurethane inomer was prepared by isophorone diisocyanate(IPDI) and 1,4-butanediol(BG)as hard segments,poly(1,4-butylene adipate glycol)(PBA) with an average molecular weight of 3000 as soft segments,polyether diol containing sulfonate(SPPG) as hydrophilic monomer in soft segment,and dibutyltin dilaurate(DBTDL) as catalysts through bulk polymerization.Polyurethane dispersions(PUDs) adhesive with a solid content of 50% was synthesized by granulation,dissolution in acetone,dispersion in water,distillation of acetone of polymerization.The effect of hard segment content and molecular weight on mean particle size and particle distribution,thermodynamics performance of cast films,and adhesive performance was researched in this paper.The results show that the maximum I-Peel strength and T-Peel strength is 6N/mm and 10.24 N/mm,respectively and the cast films has good heat resitence.