Single bath scouring and bleaching of cotton knitted fabric by hydrogen peroxide with different kinds of peroxide stabilizers and determination of its effect]

Project ID: WUB/2022/P1/012

Project Duration: 2022 - 2023

Project Leader: Md. Mostafizur Rahman (Department of Textile Engineering)

Project Members: Md. Shamsuzzaman, Dip Das

Hydrogen peroxide (H2O2 ) is the most widely used bleaching agent for textiles and over 95% of all cotton-based fabrics are bleached with it. It came into use around 1878. H2O2 bleaching gives a better result when the fabric is not prescoured. So, the present trend is to carry out the scouring and bleaching in one bath. During bleaching, H2O2 is ionized in two steps and provides free nascent oxygen. The natural color molecules in cotton fabrics are destroyed by this newly formed oxygen. It is very important to control the ionization of H2O2 at an optimum rate. Otherwise, under- or over-bleaching may occur. But the main problem is here: controlling the decomposition of H2O2 in bleach liquor. To avoid this problem, stabilizers are used in the bleaching batch to control the reaction at an optimum rate. Different types of stabilizers, from natural to organic, are available on the market and stabilize the bleaching reaction at different rates. In this proposed work, an attempt is made to review and summarize the performance of various peroxide stabilizers with respect to some important parameters such as whiteness, whiteness retention, and damage factor.