Views: 0 Author: Site Editor Publish Time: 2021-11-30 Origin: Site
The degree of oxidative damage to cotton fiber during scouring and bleaching not only affects the strength of the fabric, but also affects the dyeing performance of the fiber. It is one of the important reasons for the color and color difference in dyeing, which must be paid attention to.
The fundamental measure to minimize the degree of oxidative damage of cotton fiber is to control the decomposition reaction of hydrogen peroxide to make it more conducive to the reaction of pigments and other impurities, and to avoid the ineffective decomposition of hydrogen peroxide (reaction to generate 02). And inhibit the decomposition reaction (such as the formation of HO.) which has a bleaching effect but at the same time has a strong oxidative effect on the cotton fiber.
In particular, the effect of hydrogen peroxide scouring and bleaching and the degree of fiber damage are related to factors such as the amount of hydrogen peroxide, alkali agent and pH value, scouring and bleaching temperature and time, and the selection of stabilizers, as well as the selection of scouring and bleaching equipment and the formulation of related processes. It is also an effective measure to control the degree of oxidative damage of cotton fiber. Cold-pressed reactor scouring and bleaching, the decomposition rate of hydrogen peroxide is slow at low temperature, and the cotton fiber damage is small; The high-temperature stage insulation steaming process can more effectively control the decomposition of hydrogen peroxide and minimize the degree of oxidative damage suffered by the cotton fiber.