Dyeing and finishing method for improving color fastness of fabric

Abstract

The invention discloses a dyeing and finishing method for improving the color fastness of a fabric. The method includes the following specific dyeing and finishing processes: adding cotton fibers into a sodium hydroxide solution with a mass concentration of 5% for treatment and then drying, then adding a direct dye into water for stirring and dissolving, adding epoxy chloropropane, cotton fibers and sodium hydroxide, and reacting to obtain dyed fibers; and weaving the dyed fibers to obtain yarns, and adding the obtained yarns into a fixing finishing agent for impregnation and then weaving to obtain fabrics with high color fastness. According to the method, a large number of hydroxyl groups on the surface of cotton fibers are exposed after the fibers are pretreated, and then the hydroxyl groups can be combined with dyes through chemical bond action, so that the bonding strength between the dyes and the fibers is improved; and meanwhile, a layer of protective film is compounded on the surface of yarns, namely the surface of coloring materials, and the protective film is connected with the coloring materials through chemical bond action, so that the protective film is firm in composite, is not easy to peel off under strong external force action, further realizes the protection of the coloring materials, and improves the solid color of the coloring materials.

Description

technical field [0001] The invention belongs to the field of fabric preparation and relates to a dyeing and finishing method for improving the color fastness of fabrics. Background technique [0002] In daily clothing, people not only pursue the comfort, but also the color and style of the clothes. For bright colored clothes, a slight color change will be very obvious during the long-term cleaning process, which will affect the appearance. Therefore, the color fastness of the fabric is The key to affecting the color change of clothes. The existing dyeing of clothes is usually to adsorb the dye on the surface of the fiber and inside the fiber through intermolecular force or physical adsorption to achieve the purpose of dyeing. However, due to the weak force between the dye and the fiber , After washing and washing, it is easy to peel off the dye and fade, which affects the appearance of the clothes. At the same time, the pigment usually contains a large number of unsaturated ...

AI Technical Summary

Problems solved by technology

[0002] In daily clothing, people not only pursue the comfort, but also the color and style of the clothes. For bright colored clothes, a slight color change will be very obvious during the long-term cleaning process, which will affect the appearance. Therefore, the color fastness of the fabric is The key to affecting the color change of clothes. The existing dyeing of clothes usually uses intermolecular force or physical adsorption to adsorb the dye on the surface of the fiber and inside the fiber to achieve the purpose of dyeing. However, due to the weak force between the dye and the fiber , after washing and washing, it is easy to peel off the dye and fade, which will affect the appearance of the clothes. At the same time, the pigment usually contains a large number of unsaturated bonds, which are easy to oxidize and change color under the irradiation of high-intensity ultraviolet rays, which will affect the appearance of the clothes.

Images