降解淀粉/DMDAAC-AM接枝共聚物复鞣剂的合成及应用

酶降解淀粉与二甲基二烯丙基氯化铵(DMDAAC)和丙烯酰胺(AM)在引发剂(NH4)2S2O8(APS)作用下进行了接枝共聚合反应,制得阳离子型淀粉复鞣剂。第一步酶降解条件为m(蒸馏水)∶m(淀粉)∶m(α 淀粉酶)=180∶20∶0 2,在60℃降解1h。第二步接枝聚合反应条件为m(DMDAAC)∶m(AM)∶m(APS)=40∶20∶1 5,在75℃保温反应2h。接枝共聚物的接枝率及接枝效率分别为150%和78%,单体转化率及阳离子度分别为98 5%和37%,复鞣革对于染料及加脂剂的吸收率分别为97 3%和96 2%,用红外光谱(FTIR)对复鞣剂的结构进行了表征。

Synthesis and Application of Graft Copolymer Retanning Agent of Degraded Starch and DMDAAC-AM

Using (NH4)2S2O8 as initiator,the cationic starch retanning agent was synthesized by graft copolymerization of enzyme degraded starch with acryamide(AM) and dimethyl diallyl ammonium chloride(DMDAAC).In the first step,the enzymatic degradation was carried out with m(distilled water)∶m(starch)∶m(amylase)=180∶20∶02 at 60 ℃ for 1 h.In the second step,graft copolymerization was carried out with m(DMDAAC) ∶m(AM) ∶m(APS)=40∶20∶15 at 75 ℃ for 2 h.The graft percentage and graft efficiency of copolymer were 150% and 78% respectively. The monomer conversion and cationic degree were 985% and 37% respectively.The absorptivity of dye and fat liquor of retanned leather were 973% and 962% respectively.The structure of the graft copolymer was characterized by FTIR.