What Is a Peroxide Killer

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What is a peroxide killer? After bleaching the cellulosic fiber with hydrogen peroxide, the fiber is subjected a thorough hot wash cold wash and neutralization processes. These operations would remove all superficially available chemicals that were used in bleaching process. However in practice it is found that the core alkali i.e. the alkali due to the use of caustic soda or soda ash and hydrogen peroxide, wetting agents and other auxiliaries would remain in the core of the fiber processed even after 2 or 3 washes. These residual chemicals like alkali's and peroxide are detrimental to the production of uniform flawless fabric production. The core residual alkali would lead to immature hydrolisation of the reactive dyes and results in streaky and uneven dyeing. | The residual peroxide present in the fiber will oxidize the reactive dyes' chromophore that contain the metal ions and lead to tonal variation and sometimes uneven dyeing. In some cases the chrmophore itself is getting destroyed into a colorless product and lead to pale or white patchy dyeing. Hence the removal residual alkali and peroxide are very much essential before starting a good dyeing operation. So any chemical that kills the residual peroxide in the fiber is called a peroxide killer. All reducing agents are in fact peroxide killers. Again we should note that excess presence of reducing agent in the fiber also lead to destruction of dyestuff molecule. Hence a careful selection of a peroxide killer is very much essential. Now in the market there are many enzymatic peroxide killers available that will remove the residual peroxide and die-off during subsequent dyeing operations at higher temperatures. Test Methods for quality and consistency: Specific gravity: Accurately weigh 10 ml of the peroxide killer. Specific gravity = Volume/Mass. Note down the value and do this test whenever your

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