Question 17 (Textile Engineering & Fibre Science)
During bleaching of cotton with H2O2 the stabilizer used is
Answer / Solution
Frequently Asked Questions | FAQs
What is the function of stabilizer agent?
In textile processing, stabilizers are used in the bleaching process to prevent or minimize undesirable effects such as fabric damage, color reversion, or uneven bleaching. The function of stabilizers in bleaching in textiles can vary depending on the specific type of bleaching process being used. Here are some common functions of stabilizers in textile bleaching:
pH Stabilization: Bleaching processes often require the use of chemicals that can alter the pH of the textile substrate, which may affect the performance or stability of the bleaching agents. Stabilizers are used to help maintain the desired pH range during the bleaching process, which can prevent the bleaching agents from becoming less effective or causing fabric damage.
Protection against Oxidative Damage: Bleaching agents, such as hydrogen peroxide, can generate reactive oxygen species (ROS) that can potentially damage the textile substrate, especially sensitive fibers like silk or wool. Stabilizers can act as antioxidants, scavenging the ROS and protecting the fabric from oxidative damage, such as color reversion or loss of strength.
Prevention of Color Reversion: Some bleaching processes, especially with natural fibers like cotton, may cause color reversion, where the fabric turns yellowish or brownish after bleaching. Stabilizers can help prevent color reversion by inhibiting the formation or accumulation of color-forming compounds during the bleaching process, resulting in a whiter and brighter fabric.
Protection against Enzymatic Damage: In some bleaching processes that involve the use of enzymes, stabilizers can help protect the textile substrate from enzymatic damage. Enzymes can break down fibers, especially delicate or sensitive fibers, leading to fabric damage or loss of strength. Stabilizers can inhibit the enzyme activity or protect the fibers from enzymatic attack, reducing the risk of fabric damage.
Improvement of Bleaching Performance: Stabilizers can also enhance the performance of bleaching agents by improving their stability, efficiency, or compatibility with other chemicals used in the bleaching process. This can result in more effective and consistent bleaching results, such as improved whiteness, color uniformity, or fabric quality.
It’s important to note that the specific type and amount of stabilizer used in textile bleaching can vary depending on the bleaching process, fiber type, and other factors. Proper formulation and application of stabilizers in textile bleaching should be done in accordance with industry best practices, including following recommended dosage rates, process conditions, and safety guidelines, to ensure optimal results and minimize any potential negative impacts on the fabric or the environment.