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What is the principle of fabric soaping during dyeing?

Views: 0     Author: Site Editor     Publish Time: 2023-09-06      Origin: Site


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       During the dyeing process, there are many unfixed dyes, hydrolyzed dyes, alkali agents and other chemical substances in the dye solution, which must be washed and soaped in multiple channels to remove these impurities and improve the color of the fabric. Brightness, color fastness and cleanliness. The process of removing these impurities is called soaping. Reactive dyes have the advantages of complete color spectrum, easy color matching, bright color, low price, simple process, and good fastness. Therefore, reactive dyes are widely used in the printing and dyeing of cellulose and other fibers. It is understood that 80% of the fibers on the market are dyed or printed with reactive dyes. This article mainly takes reactive dyes as an example to analyze the current situation and principle of fabric soaping.


Staining for soaping purposes

       There are many types of reactive dyes with different chemical structures and different reaction efficiencies. The diffusion and adsorption properties of these non-fixed dyes and hydrolyzed dyes are similar to the original reactive dyes, so they can be easily adsorbed on the fiber surface and penetrate into the fiber interior. Under the action of alkaline agents, temperature and pressure, these unfixed dyes and hydrolyzed dyes are bound to the fibers to a certain extent, which easily leads to bleeding and re-staining. The primary goal of soaping is to remove pigment residues, ensuring fabrics are vibrantly colored and retaining various physical properties, thereby improving product quality.

        These unfixed dyes and hydrolyzed dyes have very similar diffusion and adsorption properties to the original reactive dyes, so they are easily adsorbed on the fiber surface and diffuse into the fiber. In the case of alkaline agent and temperature pressure, these unfixed dyes and hydrolyzed dyes (floating color) are partially combined with the fiber, which is easy to cause bleeding and re-staining (secondary dyeing), wet rubbing fastness, dry rubbing fastness Degree, washing fastness, anti-staining properties are not ideal. The main purpose of soaping is to remove floating color, to ensure the brightness and various physical properties of the fabric, that is, to improve the quality of the product.

       Jervay acid anti-stain soaping agent JV-100 is compounded by special polymer compounds, and is specially used for printing nylon, silk, wool fabrics, etc. Stain-resistant soaping and stain removal to remove floating color. The printed fabric washed by it has a bright hue, no color matching between various colors, and excellent color fastness. It is an ideal soaping agent for dyeing and printing.


The main properties are:

1. It has excellent solubilizing properties for acid dyes, and is an excellent dye co-solvent and color-removing soaping agent

2. It can be chelated with acid dyes to reduce the affinity of dyes to fibers at low temperature, so as to achieve the white ground anti-staining function of printed fabrics

3. JV-100 is a low-foaming substance, which will not have adverse effects on post-dyeing soaping and printing defloating, desizing and soaping

4. It is suitable for printing wool, nylon, silk, etc. with acidic and network dyes and for removing floating color and soaping after dyeing

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