离子交换与吸附

通过化学引发接枝的方法,以含季铵基的烯类单体接枝羊毛纤维,制备了一类抗菌羊毛纤维。探讨了反应体系pH值、引发剂浓度、反应时间、温度、单体浓度和浴比等因素对羊毛纤维接枝率的影响,并优化了接枝工艺。其中,单体浓度、化学引发剂过氧化氢与抗坏血酸的浓度是影响羊毛纤维接枝率的关键因素。高单体浓度在增大接枝率的同时,还形成了大量的均聚物;而高过氧化氢浓度在促进接枝的同时,会造成了羊毛纤维的降解。接枝羊毛纤维的抗菌性能及耐洗涤性能测试表明,接枝率大于4%的羊毛纤维具有良好的抗菌性能,对大肠杆菌、金黄色葡萄球菌、白色念珠菌的抗菌率均大于99.9%;抗菌羊毛纤维经20次洗涤后,仍能保持良好的抗菌性能。

In this article,wool was chemically modified by grafting acrylic monomer with quaternary ammonium group using hydrogen peroxide/ascorbic acid as the initiating agent.The effects of grafting copolymerization reaction conditions,including pH of solution,concentrations of initiators,reaction temperature,monomer concentrations and liquor ratio of fiber to solution,on the grafting degree of wool were investigated.The grafting conditions were optimized.It is concluded that concentrations of monomer and initiators were the key factors determining the grafting degree of wool.Higher monomer concentration would increase the grafting degree,and might also result in a larger amount of homopolymers.Excessive amount of hydrogen peroxide will simultaneously lead to a degradation of wool while increasing grafting reaction.Antibacterial activities,washing durability of the grafted wool were examined.It's found that wool grafted with over 4% acrylic copolymers containing quaternary ammonium groups exhibited excellent antibacterial activities(deactivating>99.9% against E.coli,S.areaus and C.albicans),sustaining at least 20 washing cycles without obvious reduction in the antibacterial activities.