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Hydrogen peroxide usage

2019-08-06

Hydrogen Peroxide is an excellent bleaching agent, which oxidizes and bleaches cellulose fibers by oxidation. It has pure whiteness, good stability and no pollution, and has no corrosive effect on equipment. Therefore, hydrogen peroxide bleaching is widely used in the textile printing and dyeing industry.
When bleaching with hydrogen peroxide, a certain amount of stabilizer must be added to the bleaching liquid to control the decomposition rate of hydrogen peroxide, so that it can be uniformly and effectively decomposed to avoid severe damage to the fabric. There is a lot of debate about the hydrogen peroxide bleaching mechanism, but it is generally accepted by Peter Ney of Germany that the substance that causes the fabric to bleach is hydrogen peroxide ion (H00-), which is mainly caused by oxidation of cellulose. Hydrogen radical (H00·).
For this reason, HOO· is suppressed during the bleaching process of the fabric, and HOO- is stabilized to prevent oxidation of the cellulose, and a good oxygen bleaching effect is obtained. In actual production, the decomposition of hydrogen peroxide is affected by three factors: temperature, pH, and heavy metal ions.
Hydrogen peroxide stabilizers can be divided into silicon-containing and non-silicon-based chemical components; they can be classified into two types: adsorption type and chelation type.
The most typical adsorbent stabilizer is water glass. Water glass is a network type lattice structure colloid. It swells into a sponge-like colloid in water and has a large specific surface area. It has strong adsorption capacity, can adsorb Fe2+ and block HO-, so that Fe2+ does not undergo catalytic reaction. Inhibits the formation and decomposition of H00·free radicals. The water glass can combine with Ca2+ and Mg2+ ions in the bleaching liquid to form a highly dispersed magnesium silicate and calcium silicate colloid, which is adsorbed on the surface of the catalyst to make it inactive, thereby stabilizing.
Chelating stabilizers can form complexes with heavy metal ions, thereby reducing or eliminating the catalytic decomposition of heavy metal ions to hydrogen peroxide.

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