What is the color fastness of fabrics and how to improve the color fastness of fabrics
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What is the color fastness of fabrics? How to improve the color fastness of fabrics? Color fastness is a type of color fastness, also called color transfer fastness or bleeding resistance. Color fastness refers to the migration and staining of dyes or residual floating colors on fabrics. It mainly reflects the fabric’s resistance to washing or being exposed to rain. The degree of contamination that causes dye to dissolve out of the dyeing area and transfer color to white or light-colored base fabrics comes from Japan. It is also called the “Daimaru method” in the Japanese testing method.
Color fastness has become one of the common testing items in Japan. It is generally required to reach level 4 or above level 4-5, which is mainly manifested in medium and dark colors. It is often related to stain fastness. Yes, if the stain fastness is good, the color fastness will also be good.
What is the color fastness of fabrics and how to improve the color fastness of fabrics
The improvement of color fastness of pure cotton fabrics can be improved and strengthened from the following main aspects:
1. Select appropriate dyes
Since dyes are often accompanied by a small amount of incompletely reacted dyes during synthesis, The presence of these dyes will not only affect the color fastness but also other color fastnesses, so color fastness testing should be done before use. At the same time, attention should be paid to the selection of reactive dyes whose water-soluble groups in the dye structure should not be too high and whose directness is medium.
2. Pay attention to the influence of water quality
Calcium and magnesium ions in water will form insoluble substances with dyes and adsorb on the fiber surface, becoming floating colors and hindering the diffusion and penetration of dyes, reducing color fastness and even affecting color light and brightness. etc., so it is necessary to use soft water or add chelating dispersant, etc.
3. Strengthen the washing and soaping process
The residual alkali salts, hydrolyzed and unbonded dye floating color on the fiber are the key to affecting the fastness. High-efficiency anti-stick soaping with excellent performance should be used. Agent, and try to soap under neutral or weak acid, and use a higher temperature to wash away the unbound dye inside the fabric. However, it should also be noted that too high a temperature will cause the bond of the bound dye to fall off, especially in alkali. under sexual conditions.
4. Use fixation treatment
After treatment with cationic and reactive fixatives with excellent performance, the water-soluble groups of the dye can be blocked, causing the dye to become an insoluble lake and deposited in the fiber, reducing the dye’s viscosity. It is water-soluble. At the same time, a small amount of hydrolyzed dyes can also participate in color fixation and cross-linking to further increase the binding force with the fiber, thereby effectively improving the wet treatment and color fastness of the dye. If necessary, individual deep and concentrated colors can also be re-fixed. Process processing.
Of course, in addition to paying attention to the above points, the quality of the gray fabric itself, whether the pre-treatment, boiling, bleaching and impurity removal are even and transparent, and whether the dyeing process is reasonable will affect whether the dye can fully absorb, diffuse and fix the effect. Further standardize the operation and optimize The process of avoiding the formation of excessive dyes and re-dying on the fiber surface after dyeing is the basis and guarantee to ensure the color fastness of reactive dyes and to improve the color fastness.
Keywords: Color fastness to fabric Color fastness to fabric
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