支化型水性聚氨酯胶黏剂的合成及性能

Synthesis and properties of branched waterborne polyurethane adhesives

摘要:

采用异佛尔酮二异氰酸酯(IPDI)、聚四氢呋喃醚二醇(PTMG2000)为原料，二月桂酸二丁基锡(DBTDL)、1, 4-丁二醇(BDO)和2,2-二羟甲基丙酸(DMPA)分别为催化剂、小分子扩链剂和亲水单体，制得水性聚氨酯预聚体(PPU)；以丙烯酸甲酯(MA)、二乙醇胺(DEA)和三羟甲基丙烷(TMP)为原料合成的超支化聚（胺-酯）(HPAE)为交联剂；制备出不同HPAE含量的支化型水性聚氨酯胶黏剂。采用FT-IR光谱和1H-NMR谱图对HPAE及HPAE-WPU的结构进行表征； TGA、多功能材料试验机考察胶膜的热力学性能和机械性能。结果表明：HPAE用量为1%时，HPAE-WPU乳液及胶膜综合性能较好，其乳液固含量为33.67%，胶膜吸水率为11.22%，水接触角为90.32°；胶膜机械性能较好，其拉伸强度为10.33 MPa，断裂伸长率为533.73%；改性聚氨酯粘结性能良好，其剥离强度为4.063 N/mm。

Abstract:

Using isophorone diisocyanate (IPDI) and polytetrahydrofuran ether glycol (PTMG/2000) as the main raw materials, dibutyltin dilaurate (DBTDL), 1,4-butanediol (BDO) and 2,2-di hydroxymethyl-propionic acid (DMPA) as catalyst, small molecule chain extender and hydrophilic monomer to prepare a waterborne polyurethane prepolymer (PPU). Hyperbranched poly(amine-ester) (HPAE) synthesized from methyl acrylate (MA), diethanolamine (DEA) and trimethylolpropane (TMP) as a crosslinking agent. Branched waterborne polyurethane adhesives with different HPAE content are prepared. FT-IR spectroscopy and 1H-NMR spectroscopy were used to characterize the structure of HPAE and HPAE-WPU; TGA and multifunctional material testing machine were used to investigate the thermodynamic and mechanical properties of the film. The results show that when the amount of HPAE is 1%, the comprehensive performance of HPAE-WPU emulsion and film is better. The solid content of the emulsion is 33.67%, the water absorption rate of the film is 11.22%, and the water contact angle is 90.32°; the mechanical properties of the film are better, its tensile strength is 10.33 MPa, and its elongation at break is 533.73%; the modified polyurethane has good bonding properties, and its peel strength is 4.063 N/mm.