苎麻纤维NaOH/尿素/硫脲低温柔化处理研究

Low temperature softening modifition of ramie fibers by NaOH/urea/thiourea

在现有NaOH／尿素体系低温柔化处理苎麻纤维的基础上，通过加入助溶剂硫脲，来提高苎麻纤维低温柔化处理的温度。研究了经NaOH／尿素／硫脲溶液处理后苎麻纤维性能的变化，通过对溶液配比、处理温度、处理时问和浴比等影响因素的研究，得出结论为：在-10℃时，溶液对纤维的最大溶解度配比为NaOH／尿素／硫脲=7：10：6．5；苎麻纤维处理温度越低、处理时问越长、浴比越大，纤维的断裂强度和初始模量越小，断裂伸长率越大；温度为I℃，处理时间为10min，浴比为l：10是较佳的处理工艺。

Based on the existing low temperature softening modification of ramie fibers with NaOH/urea system, adding thiourea is used to improve the temperature of low temperature softening modification. The influences of solution ratio, treatment temperature, treatment time and bath ratio on properties of ramie fibers are studied. The results show that when the temperature is - 10%, the solution ratio of the maximum solubility is NaOH/urea/thiourea of 7 ： 10 ： 6.5. The breaking tenacity and the initial modulus of ramie fibers show a down trend along with the decreasing of temperature and the increasing of time and bath ratio, while the breaking elongation of ramie fibers increases. The optimum treatment condition is treating at 1 -C for 10 min with bath ratio of 1 ： 10.