What is Stabilizer?
Stabilizer makes complex compound with catalyst but not react and stop the oxygen generation into solution and preserved the strength loss of hydrogen peroxide. High pH and temperature lead to the decomposition of peroxide bleaching liquor and degradation of cellulose.
Working Process and Functions of Stabilizing Agent in Textile Wet Processing
The basic mechanism of stabilizer involves the stabilization of chemical reactions by inhibiting the reaction or slowing down the reaction.
The role of the stabilizer is simply to control or regulate these effects the act as buffers, sequestrates and in special cases, enhancing performance of the surfactant used in the bleach bath. The sequestering and inactivates metallic impurities which causes catalytic decomposition of hydrogen peroxide or precipitation of hydroxides or carbonates. These impurities the most common being calcium and iron are brought into the bleaching system by the fabric water supply or the other chemical used.
The sodium silicate is one of the most commonly used stabilizers, but it results in a harsh handle of the fabric as well as resist spots leading to spotty dyeing. The alternatives to sodium silicate are organic stabilizers or a combination of silicate and organic stabilizers. The stabilize were the sodium polysilicate (effective at lower), the sodium metasilicate (washed out readily) than the polysilicate also used sodium orthosilicate and potassium silicate.
Substrates bleached with a silicate stabilizer must be washed off in soft neutral boiling water in order to prevent problem caused by insoluble silicates or silic acid. Although sodium silicate is both effective and economical, the problems associated with silicate deposits on fabric and machinery have made alternative non-silicate or organic stabilizers.
Stabilizers for bleaching are products of fundamental importance to regulate the development of the oxidizing agent used in the process for natural, artificial and mixed fibers.
In addition to the normal ingredients of the bleaching recipe, namely hydrogen peroxide, caustic soda and the stabilizer, auxiliaries are used sometimes to aid the bleaching process. These may include surfactants and sequestering agents. The type and concentration of these auxiliaries also play an important role in the bleaching effect obtained.
Advantages of Sodium Silicate:
- Good degree of whiteness.
- Better bleaching of veg. matter and removal of husks.
- Masking of heavy metal ions.
Disadvantages of Sodium Silicate:
- Sensitive to water hardness.
- Handle impairment.
- Reduction in absorbency.
- Blocking of pipes.
In order to avoid these disadvantages organic stabilizers together with magnesium salt 0.2g/litre.
You may also like:
- List of Chemicals and Auxiliaries Used in Textile Wet Processing
- Function of Salt in the Textile Wet Processing
- Effect of pH in Textile Wet Processing Industry
- Typical List of Chemicals Used in Dyeing Mill
- List of Garment Washing Chemicals and Their Functions
- Different Types of Textile Chemical Testing Procedure
Founder & Editor of Textile Learner. He is a Textile Consultant, Blogger & Entrepreneur. He is working as a textile consultant in several local and international companies. He is also a contributor of Wikipedia.