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What factors affect the color fastness to rubbing test results?
The fabric abrasion test is divided into the rubbing color fastness test of the fabric and the rubbing test such as the milk pilling and abrasion test of the fabric. There are different requirements for different standards. In this paper, the engineer will analyze the experimental results of the rubbing color fastness of the fabric. , Focus on the discussion about those external factors that will cause errors in the test results of the rubbing color fastness test. 1. When choosing dyes, choose dyes with good liftability and levelling properties. Both good liftability and levelling properties are conducive to the penetration and diffusion of dyes, which can improve the wet rubbing fastness to a certain extent. The dye should have a certain degree of water solubility and directness, and there should not be too many water-soluble groups, otherwise it will affect the wet rubbing fastness later. And the directness should also be chosen to be medium as the best. The directness of the selected dye should not be too high, under normal circumstances it should be greater than 70%. 2. Starting from the improvement of the characteristics of the dyed cloth surface, finishing the fabric, such as biological enzyme polishing treatment, etc., makes the cloth surface smooth and improves its wet rubbing fastness. 3. Since it is difficult to remove the floating color after dyeing with reactive dyes, an appropriate color stripping agent can be used for stripping treatment after soaping, so as to remove the floating color and improve its wet rubbing fastness. 4. Use high-efficiency fixing agent. The selected fixing agent should be able to 'bridging' between the dye and the fiber to form a compound. When reacting with the dye, it can also react and crosslink with the cellulose fiber, so that the dye fiber can be They are tightly and firmly connected to prevent the dye from falling off the fiber and prevent the dyeing fastness from decreasing. 5. For cotton grey cloth, choose grey cloth with uniform yarn count and smooth surface. If pretreatment is required, high-efficiency pretreatment agents should be used. 6. Use soft water or deionized water as much as possible for the dyeing water with reactive dyes to reduce the influence of calcium and magnesium plasma in the water on dyeing. 7. Pay attention to the pH value of the fabric surface after dyeing. Because the dyeing process of dark and dense cotton fabrics generally uses a higher amount of alkali, and then strengthen washing, soaping and neutralization, the fabric should not be carried with alkali, so as to prevent the dye from being hydrolyzed after dyeing and causing the wet rubbing fastness to decrease. Generally, the pH value of the cloth surface is controlled between 6.5 and 7.5, and cannot exceed 9 or less than 3. 8. Use special additives, such as darkening agents, to finish dyed fabrics, which can reduce the amount of dyes to obtain a deep color effect and improve wet rubbing fastness. More about fabric rubbing fastness tester: http://www.selaoduyi.com/productlist/list-5-1.html
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