Lyocell纤维的漂白工艺

Study on Bleaching of Lyocell Fiber with Hydrogen Peroxide

建立了一种应用于Lyocell纤维的新型漂白工艺。分析了漂白液中的过氧化氢质量分数、漂白时间、pH值、漂白温度、稳定剂质量分数对Lyocell纤维的白度和干断裂强度的影响。在确定的漂白工艺四步骤中第一步为预漂白,加入了稳定剂DELINOL 9258,增加了漂白效果。漂白步骤最佳优化条件是:过氧化氢质量分数0.8%,漂白时间50 min,漂白液pH值11,漂白温度80℃,稳定剂LAVATEX9188质量分数0.3%。

A new bleaching system of the Lyocell fiber is established. The effects of hydrogen peroxide dos- age, time, pH value, temperature, stabilizer dosage in bleach solution on the whiteness and dry tensile strength of the Lyocell fiber are analyzed. The four bleaching processes are efficient and low power con- sumption. And in the first process of pre-bleaching, the stabilizer DELINOL 9258 can increase bleaching effectiveness, the optimal conditions： 0.8 % of H202, 0.3 % of stabilizer LAVATEX 9188, bleaching at 80 ℃ for 50 min, pH value of bleaching liquor 11.