苎麻纤维预辐照二步接枝胺化提高染色性研究

摘要

Acrylic acid (AA) was grafted onto the surface of ramie fiber to get ramie-g-AA via electron beam preirradiation,then ethylenediamine (EDA) reacts with the grafted ramie fiber by preirradiation to get ramie-g-AA-EDA,and two-step amination was achieved.The monomer concentration dependence of the grafting rate and the amination rate was discussed.Through the experiments of the salt-free dyeing of modified ramie fiber,the effects of the grafting rate of AA and the rate of amination on the dyeing rate were analyzed.It is possible that AA and EDA are grafted on the ramie fiber by preirradiation,and the grafting rate of AA and the rate of amination increase with the monomer concentration respectively.When the absorbed dose is 40 kGy,and the EDA concentration is 35%,the EDA amination rate of ramie-g-AA samples (AA grafting rate is 25%) can reach 20.1%.After grafting AA,ramie fiber's dyeing rate is reduced,and decreases with the increase of AA grafting rate,when AA grafting rate is 25.1%,the dyeing rate drops to just 4.2%.The dyeing rate of ramie-g-AA-EDA increases more significantly than that of ramie-g-AA,and increases with the amination rate,when the modified ramie fiber has a AA grafting rate of 25% and a amination rate of 25%,the dyeing rate is up to 49%.%通过电子束预辐照将丙烯酸(AA)接枝到苎麻纤维上形成苎麻-g(接枝)-AA,再用乙二胺(EDA)对苎麻-g-AA进行预辐照接枝胺化形成苎麻-g-AA-EDA,讨论了预辐照接枝率和胺化率与单体浓度的关系.在此基础上对改性苎麻纤维进行无盐染色实验,分析了AA接枝率和EDA胺化率对其上染率的影响.结果表明:苎麻纤维通过预辐照成功接上AA,并进一步接枝EDA实现了胺化,且AA的接枝率和EDA的胺化率随单体浓度的增加而增大,当吸收剂量为40 kGy、EDA浓度为35%时,AA接枝率为25%的苎麻-g-AA样品的EDA胺化率可达20.1%;接枝AA后的苎麻纤维上染率降低,且随AA接枝率的增大而减小,当AA接枝率为25.1%时,上染率低至4.2%;胺化后的苎麻-g-AA-EDA纤维上染率较未胺化的苎麻-g-AA纤维的上染率明显提高,上染率随胺化率的增加而增大,AA接枝率约为25%、胺化率为25%的改性苎麻纤维的上染率达49%.