桑蚕丝纤维低温处理后结构及活性染料染色

Structural Study of Mulberry Silk Fiber with Low Temperature Treatment and Its Reactive Dyeing

在回潮率为40%,冷冻时间为24 h,冷冻温度为-86^-10℃的条件对普通脱胶桑蚕丝纤维进行低温冷冻处理,通过SEM测试、FT-IR测试及XRD测试探讨了桑蚕丝纤维前低温冷冻处理前后结构变化,并对低温冷冻处理后桑蚕丝纤维进行力学性能测试。采用兰纳素蓝3G染料对处理前后桑蚕丝纤维进行染色,并进行染色性能测试。结果表明,低温冷冻处理后纤维表面出现明显的孔洞、裂痕结构;低温冷冻处理后的蚕丝蛋白结构仍以β-折叠结构为主,无规线团结构及α-螺旋结构有向更稳定结构转变的趋势;低温冷冻处理后桑蚕丝纤维仍以silkⅡ型结晶结构为主;低温冷冻处理后纤维的断裂强力有所下降,但伸长率明显提高;采用兰纳素蓝3G染料染色,上染率、固着率及总固着率均有所提高,染料的利用率大大提高。

Ordinary degummed mulberry silk fiber was treated at low temperature when moisture regain was 40%, freezing time was 24 h, and freezing temperature was -86^-10 ℃. The structure of mulberry silk after low temperature treatment was discussed by SEM test, FT-IR test and XRD test, and its mechanical property was also tested. Lanasol blue 3G dyes was used to dye mulberry silk after treatment, and the dyeing property was also test-ed. The results show that fiber surface appears obvious holes and crack structure after low temperature treatment;Mullberry silk is still with β-sheet structure, mulberry silk fiber is still with silk type Ⅱ crystallized structure after low temperature treatment; the breaking strength of mulberry silk fiber after low temperature treatment declines, but the elongation significantly improves; the dye up-take, fixation rate and the total fixation rate all improve, and the utilization of dyes greatly improves.