ABSTRACT

Bleaching of jute has become essential for making white glossy fabric or base material for coloration intended for value added and diversified products. The conventional hot hydrogen peroxide bleaching process produces white fiber with high loss of tensile strength and impairing the feel. On the other hand newly developed peracetic acid bleaching of jute produces minimum loss of tenacity without impairing the feel but whiteness achieved is slightly low. Partial bleaching of jute was carried out using 25%, 50%, and 75% of the normal dose of bleaching agents and their whiteness index as well as tensile strength were evaluated. In all the cases hydrogen peroxide produced 5–8 grade higher whiteness in HUNTER scale while peracetic acid bleached sample retains higher tensile strength. So, two-step bleaching was carried out using hydrogen peroxide and peracetic acid following single-bath and double-bath processes. Two-step single-bath bleaching of jute fabric using 75% peracetic acid followed by 25% hydrogen peroxide bleaching treatment results in best effect with respect to optical and physical properties.

摘要

黄麻的漂白对于制造用于增值和多样化产品的白色光泽织物或着色基材已变得必不可少。传统的热过氧化氢漂白工艺产生的白色纤维具有很高的拉伸强度损失并损害手感。另一方面，新开发的黄麻过氧乙酸漂白法在不损害手感的情况下产生最小的韧性损失，但所达到的白度略低。黄麻的部分漂白分别使用正常剂量的25%、50%和75%的漂白剂，并评估了它们的白度指数和拉伸强度。在所有情况下，过氧化氢在 HUNTER 标度中产生了 5-8 级的高白度，而过氧乙酸漂白样品保留了更高的拉伸强度。所以，在单浴和双浴工艺之后，使用过氧化氢和过乙酸进行两步漂白。使用 75% 过氧乙酸和 25% 过氧化氢漂白处理对黄麻织物进行两步单浴漂白，在光学和物理性能方面效果最佳。