What is the color fastness of the fabric? How to improve the color fastness of the fabric? Color fastness is a kind of color fastness, also called color fastness or color fastness. It refers to the migration and stain of dye or residual floating color on fabric, which mainly reflects the fabric after washing or being rained. The degree of contamination that causes the dye to be dissolved in the dyeing area to be transferred to a white background or a light-colored base fabric comes from Japan, and is also called the "Ball Pill Method" in the Japanese test method.
Color fastness has become one of the common testing items in Japan. It is generally required to reach level 4 or above, mainly in the middle and dark colors. It is often associated with color fastness. If the color fastness is good, the color fastness will be good.
1. Choosing the right dye Because the dye is often accompanied by a small amount of dye that is not completely reactive in the synthesis, the presence of these dyes will not only affect the color fastness but also other color fastness, so the color fastness test should be done before use. At the same time, it should be noted that it is preferred to use a reactive dye which does not have a water-soluble group in the dye structure and is not too high in directness.
2. Pay attention to the influence of water quality. Calcium and magnesium ions in water will form insoluble matter with dyes and adsorb on the surface of the fiber, which will become floating color and hinder the diffusion and penetration of dyes. It will reduce the color fastness and even affect the color and vividness. Therefore, soft water must be used. Or a chelating dispersant or the like is added.
3. Strengthening the alkali salts remaining on the fibers of the washing and soaping process, and the floating color of the unbonded dyes are the key factors affecting the fastness. High-performance anti-stick soaping agents with excellent performance should be selected, and try to be in the middle. Soaking with a weak or weak acid, while using a higher temperature to wash away the unbound dye inside the fabric, but also pay attention to the excessive temperature will cause the broken bond of the bound dye, especially under alkaline conditions.
4, using solid color treatment with excellent performance of cationic and reactive fixing agent can block the water-soluble groups of the dye to make the dye into a poorly soluble lake and deposit in the fiber, reducing the water solubility of the dye, while a small amount of hydrolysis The dye can also participate in fixing cross-linking to further increase the binding force with the fiber, thereby effectively improving the wet treatment of the dye, the color fastness, and the like, and if necessary, the individual deep dark color can also be subjected to the re-fixing process.
Of course, in addition to paying attention to the above points, whether the quality of the grey cloth itself and the pretreatment, whether it is well-drained or not, and whether the dyeing process is reasonable or not, will be related to whether the dye can fully adsorb, diffuse and fix the dye, further standardize the operation and optimize the process to avoid dyeing. Excessive dyeing on the surface of the fiber and the formation of the dyeing phenomenon are the basis and guarantee for ensuring the color fastness of the reactive dye and also improving the color fastness.
Color fastness has become one of the common testing items in Japan. It is generally required to reach level 4 or above, mainly in the middle and dark colors. It is often associated with color fastness. If the color fastness is good, the color fastness will be good.
1. Choosing the right dye Because the dye is often accompanied by a small amount of dye that is not completely reactive in the synthesis, the presence of these dyes will not only affect the color fastness but also other color fastness, so the color fastness test should be done before use. At the same time, it should be noted that it is preferred to use a reactive dye which does not have a water-soluble group in the dye structure and is not too high in directness.
2. Pay attention to the influence of water quality. Calcium and magnesium ions in water will form insoluble matter with dyes and adsorb on the surface of the fiber, which will become floating color and hinder the diffusion and penetration of dyes. It will reduce the color fastness and even affect the color and vividness. Therefore, soft water must be used. Or a chelating dispersant or the like is added.
3. Strengthening the alkali salts remaining on the fibers of the washing and soaping process, and the floating color of the unbonded dyes are the key factors affecting the fastness. High-performance anti-stick soaping agents with excellent performance should be selected, and try to be in the middle. Soaking with a weak or weak acid, while using a higher temperature to wash away the unbound dye inside the fabric, but also pay attention to the excessive temperature will cause the broken bond of the bound dye, especially under alkaline conditions.
4, using solid color treatment with excellent performance of cationic and reactive fixing agent can block the water-soluble groups of the dye to make the dye into a poorly soluble lake and deposit in the fiber, reducing the water solubility of the dye, while a small amount of hydrolysis The dye can also participate in fixing cross-linking to further increase the binding force with the fiber, thereby effectively improving the wet treatment of the dye, the color fastness, and the like, and if necessary, the individual deep dark color can also be subjected to the re-fixing process.
Of course, in addition to paying attention to the above points, whether the quality of the grey cloth itself and the pretreatment, whether it is well-drained or not, and whether the dyeing process is reasonable or not, will be related to whether the dye can fully adsorb, diffuse and fix the dye, further standardize the operation and optimize the process to avoid dyeing. Excessive dyeing on the surface of the fiber and the formation of the dyeing phenomenon are the basis and guarantee for ensuring the color fastness of the reactive dye and also improving the color fastness.
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