多羟基植酸衍生物交联改性水性聚氨酯胶黏剂的制备及其性能研究

Study on preparation and properties of crosslinking modification of waterborne polyurethane adhesive with polyhydroxyphytic acid derivatives

为减少水性聚氨酯对不可再生资源的依赖以及充分利用生物质材料的结构优势,本文采用异氟尔酮二异氰酸酯(IPDI)、聚四氢呋喃醚二醇(PTMG-2000)、植酸衍生物(PRPA)为主要原料合成了不同PRPA含量的多羟基水性聚氨酯胶粘剂(PRPA-WPU).FT-IR、TG、SEM表征结果表明:PRPA被成功引入到聚氨酯主链结构中;PRPA-WPU的最大热分解温度达402.1℃.单因素结果表明,PRPA的用量为2.0 wt.%时,所制备的PRPA-WPU乳液及胶膜的综合性能较优,其乳液固含量为41.63%;胶膜的拉伸强度和断裂伸长率分别为18.96 MPa和621.55%;吸水率为10.78%,水接触角为88.5°;剥离强度达3.879 N/mm.与未改性的水性聚氨酯相比,其吸水率降低了42.14%,粘结强度提高了106.11%,可用作鞋和箱包胶黏剂.

In order to reduce the dependence of waterborne polyurethanes on non-renewable resources and make full use of the structural advantages of bioresources,in this study polyhydroxyl waterborne polyurethane adhesive(PRPA-WPU)with different PRPA contents was synthesized in which isophorone diisocyanate(IPDI),polytetrahydrofuran ether glycol(PTMF-2000)and phytanic acid derivative(PRPA)were as raw materials.The characterization results of FTIR,TG and SEM showed that PRPA was successfully introduced into polyurethane chain,as well as the maximum thermal decomposition temperature of PRPA-WPU reached to 402.1℃.The single factor experiment results indicated that when the dosage of PRPA was 2.0 wt.%,the performance of PRPA-WPU emulsion and film was the best.The solid content of PRPA-WPU emulsion was 41.63%.The tensile strength and elongation at break of PRPA-WPU film were 18.96 MPa and 621.55%,respectively.Meantime,the water absorption rate was 10.78%,the water contact angle was 88.5°and the peeling strength was 3.879 N/mm.Compared with unmodified waterborne polyurethane,the water absorption rate of PRPA-WPU film reduced by 42.14%and the bonding strength increased by 106.11%.Therefore,it can be used as adhesive of shoe and luggage.