支化型水性聚氨酯胶黏剂的合成及性能

采用异佛尔酮二异氰酸酯(IPDI)、聚四氢呋喃醚二醇2000(PTMG2000)为原料,二月桂酸二丁基锡、1,4-丁二醇和2,2-二羟甲基丙酸分别为催化剂、小分子扩链剂和亲水单体,制得水性聚氨酯预聚体(PPU);接着以丙烯酸甲酯、二乙醇胺和三羟甲基丙烷为原料合成了超支化聚(胺-酯)(HPAE);最后制备出不同HPAE含量(以IPDI与PTMG2000的总质量为基准,下同)的支化型水性聚氨酯(WPU)胶黏剂.采用FTIR和1HNMR对HPAE及胶黏剂的结构进行了表征;通过TGA、多功能材料试验机考察了胶膜的热力学性能和机械性能.结果表明,HPAE用量为IPDI与PTMG2000的总质量的1.0％时,制备的WPU2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°;胶膜机械拉伸强度为10.33 MPa,断裂伸长率为533.73％;其粘结性能良好,剥离强度为4.063 N/mm.

Synthesis and properties of branched waterborne polyurethane adhesives

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.