Commonly used dyes for pure cotton fabrics and their dyeing properties
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Pure cotton fabric dye dyeing city textile
The dyes used for dyeing pure cotton fabrics mainly include direct dyes, reactive dyes, vat dyes, and soluble dyes. Vat dyes, insoluble azo dyes, sulfur dyes, etc. Since azo dyes and sulfur dyes are not environmentally friendly dyes, many companies have stopped using these two dyes. The functional pure cotton produced by City Textile The use of these two types of dyes on fabrics is also prohibited.
The following is a brief introduction to the dyeing properties of City Textile commonly used dyes when dyeing pure cotton fabrics.
1. Reactive dyes
Reactive dyes refer to soluble dyes containing reactive groups dye. Under appropriate conditions, it can react chemically with cellulose fibers and protein fibers to improve the color fastness of dyed cotton fabrics to washing and soaping. At the same time, it also has many advantages such as easy dyeing and printing, bright colors, uniform color spectrum, and low price. However, generally reactive dyes have poor color fixation rates and will be hydrolyzed in alkaline solutions, causing floating colors.
2. Vat dyes
Vat dyes are insoluble in water and cannot be dyed directly. It needs to be reduced to a leuco body in an alkaline strong reducing solution of caustic soda and insurance powder. The leuco body dyes the cotton fiber. After oxidation, the insoluble dye is restored and fixed on the fiber. Vat dyes have a complete chromatogram, bright colors, and excellent color fastness to sunlight and soaping. However, due to their high price, some yellow and orange varieties are photosensitive and brittle, so their application is subject to certain restrictions.
3. Direct dyes
Direct dyes can be dissolved in water and in neutral Or in weak alkaline liquid, cotton fiber can be dyed directly. Direct dyes have complete chromatograms, simple dyeing methods, and relatively cheap prices. They were once the main dyes for cotton fabrics. However, this dye is not good enough for dyeing, and needs to be fixed in post-processing.
4. Soluble vat dyes
Soluble vat dyes are derivatives of vat dyes , soluble in water, and after dyeing on the fiber, it needs to be oxidized in an acid solution to hydrolyze and oxidize the dye, and then restore it to an insoluble vat dye and dye it on the fiber. The dyeing process of soluble vat dyes is relatively simple, the dyeing is relatively uniform, and the dyeing fastness is high. However, this dye is expensive and is mainly used for dyeing and printing of light and medium-colored cotton fabrics.
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