超支化聚氨酯丙烯酸酯胶粘剂的制备与性能

Preparation and properties of hyperbranched polyurethane acrylate adhesive

使用异佛尔酮二异氰酸酯、聚四氢呋喃二醇、三羟甲基丙烷、甲基丙烯酸羟乙酯等为原料,制备了超支化聚氨酯丙烯酸酯(HPUA)。通过加入光引发剂、活性稀释剂配制了一系列光固化胶粘剂,并对其结果进行结构表征以及热稳定性研究。探究了光引发剂种类、HPUA与活性稀释剂三羟甲基丙烷三丙烯酸酯(TMPTA)的比例以及硅氧烷偶联剂(3-氨丙基三乙氧基硅烷)用量对光固化胶粘剂性能的影响。研究结果表明:成功制备了预期产物,所合成的HPUA具有优良的热稳定性。当选用质量分数为3%的光引发剂Irgacure1173,m(HPUA)∶m(TMPTA)=1∶1,同时添加3%含量的3-氨丙基三乙氧基硅烷,制备的光固化胶粘剂的综合性能最佳。此时胶粘剂对玻璃基材的拉伸剪切强度为2.15 MPa,断裂伸长率为49.23%,凝胶率为98.56%,体积收缩率为1.02%,邵氏硬度为D55。

Hyperbranched polyurethane acrylate(HPUA)was prepared by using isophorone diisocyanate,polytetrahydrofuranediol,trimethylolpropane,and hydroxyethyl methacrylate as raw materials.A series of photocuring adhesives were prepared by adding photoinitiators and active diluents,and their structural characterization and thermal stability were studied.The effects of the type of photoinitiator,the ratio of HPUA to the active diluent trimethylolpropane triacrylate(TMPTA),and the amount of siloxane coupling agent(3-aminopropyltriethoxysilane)on the properties of photocuring adhesive were explored.The research results showed that the expected product was successfully prepared,and the synthesized HPUA had excellent thermal stability.When using 3%mass fraction of photo initiator Irgacure1173,m(HPUA):m(TMPTA)=1∶1,and adding 3%content of 3-aminopropyltriethoxysilane,the comprehensive performance of the photocuring adhesive was the best.At this time,the tensile shear strength of the adhesive to the glass substrate was 2.15 MPa,the elongation at break was 49.23%,the gelation rate was 98.56%,the volume shrinkage rate was 1.02%,and the Shore hardness was D55.