端羟基超支化聚合物的合成及对铬鞣革复鞣性能的影响

以二乙醇胺(DEA)和丙烯酸甲酯(MA)为原料,通过Michael加成反应制得AB2型单体;由"一步法"使单体与核(三羟甲基丙烷,TMP),在对甲苯磺酸(P-TSA)催化下,通过酯交换反应制得一种端羟基超支化聚(胺-酯)(HPAE)。经单因素实验筛选出了HPAE的最优合成条件:反应温度120℃、w(P-TSA)=2%(相对于单体与核的总质量)、反应时间4~5 h。用IR、GPC等手段对聚合物的分子结构进行了表征,并将HPAE应用于绵羊皮蓝湿革的复鞣。结果表明,HPAE-Ⅰ(第一代端羟基超支化聚合物)对皮样漂白作用明显,白度值增幅为19.8%;HPAE-Ⅲ(第三代端羟基超支化聚合物)可以显著提高铬鞣革撕裂强度,增幅为23.3%,抗张强度增幅为11.3%。

Synthesis of Hydroxyl-terminated Hyperbranched Polymer and Its Influences to Retannage Properties of Chrome Tanned Leather

The divergent synthesis of a series of hyperbranched poly(amine-ester) based on trimethylolpropane(as a core molecule) and methyl 3-(N,N-diethylolamino)propionate(as a AB2 monomer) synthesized via Michael addition of methyl acrylate and diethanolamine,proceeded in one-step procedure in the melt using P-TSA as catalyst.The appropriate reaction conditions were optimized:catalyst dosage 2%(based on total mass of monomer and core),reaction time 4～5 h and temperature 120 ℃.The polymer was characterized by IR and GPC.It was applied to retan wet blue leather of sheepskin.The results indicate that:HPAE-Ⅰ(the first generation of polymer) has good bleaching effect on the sample,increasing the white degree by 19.8%;HPAE-Ⅲ(the third generation of polymer) can improve the tearing resistance of chrome tanned leather obviously(increased by 23.3%),and had some help to tensile strength(increased by 11.3%) at the same time.