Dyeing And Printing Knowledge: Dye-Fixing Agent Influence On Glossiness Of Cotton Reactive Dyes
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Reactive dyes are the most common dye used in dyeing cotton. It's intermittent dyeing method is the most broadly used in cotton fabrics. In reactive dye, we still use single active group ethylene vinyl sulphone dyes in green, bright blue, dark green color. Double active group dye is commonly used.
In order to develop a color constant, reproductive and brief dye recipe, different manufacture give much advises recipes to lighted-colored, neutral,deep-colored fabrics. The manufactures can choose the 2 or 3 different dye recipes of the same manufacture to dye fabric on a different color. This dye is not needed to be not single dye, but a specially made compound dye, to get easy-absorbing and reproductive fabrics.
As we all know, the textile dyeing and finishing is the important process of reactive dyeing. This process’s purpose is to let the fabrics reaches its required fastness property. According to the related statistics, the finishing time of cotton fabrics takes 30%-50% of the dyeing process time. The whole process includes drip washing, neutralization, water washing, soap washing, drip washing, color fixing and finishing. In order to satisfy the fastness requirement of end user, the dyed product should not contain any hydrolyzing dye without fastness. But it needs to be extra treatment on soap boiling, drip washing, water washing, which increase the time and water consumption.
At present, due to more and more shortage of water, the process of increase water washing process is infeasible. And this process also increases the quantity of polluted water. In order to reach required wet fastness and decrease the water use at the same time, after one or two high-temperature soap boiled, we use a dye-fixing agent to fasten the hydrolyzing dye which is not washed by water. Thus it will not influence the evaluation of wet fastness. Moreover, finishing use the cationic dye-fixing agent, we can prevent the dye fabric from being stained because of the hydrolyzing dye in an improper storage environment.
The abdication type dye fixing agent for reactive dye is widely known as the eco-environmental protective product. It does not belong to formaldehyde product and hold different chemical properties with formaldehyde product.But with the recipe change of different dye-fixing agent, its property varies greatly. The main defects for dye fixing agent are it will cause the color and glossiness change when it is used to deal with the fabric. Though the manufacturers of dye-fixing agent declaim that the influence is small. But in fact, the result is different to a predicate.
The researcher in some China company does a study for this item focusing on the relationship of dye-fixing agent’s chemical property and glossiness. In the preliminary study, the research dye two groups: deeper color group and neutral color group. The deeper group include dark blue, garnet, blackish green, the neutral color is gray, olive color and brown. This two groups of the product are dealt with 4 types of dye-fixing agent.
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