What factors affect the results of the color fastness test to rubbing?

The fabric abrasion test is divided into the rubbing color fastness test of the fabric and the rubbing test of the fabric such as pilling and abrasion. There are different requirements for different standards. The engineer of this article (Hong Kong) Co., Ltd. will test the rubbing color fastness of the fabric. The experimental results are analyzed, focusing on those external factors that can cause errors in the test results of the rubbing color fastness test. 1. When selecting dyes, choose dyes with good lifting and leveling properties. Good lifting and leveling properties are beneficial to the penetration and diffusion of dyes, and can improve the wet rubbing fastness to a certain extent. The dye should have certain water-solubility and directness, and the water-soluble group should not be too much, otherwise it will affect the wet rubbing fastness later. The directness should also be chosen to be medium as the best. The directness of the selected dyes should not be too high, and in general, 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, increases the smoothness of the cloth surface, thereby improving its wet rubbing fastness. 3. It is difficult to remove the floating color after dyeing with reactive dyes. Therefore, after the soap is cooked, a suitable color stripping agent can be used for stripping treatment, so as to remove the floating color and improve its wet rubbing fastness. 4. Use high-efficiency color-fixing agent, the selected color-fixing agent should be able to be between the dye and the fiber“bridge”The compound is formed, and when it reacts with the dye, it can react and cross-link with the cellulose fiber, so that the dye fiber can be tightly and firmly linked together, preventing the dye from falling off the fiber, and avoiding the decrease of dyeing fastness. 5. For cotton grey fabrics, grey fabrics with uniform yarn count and smooth surface should be selected. If pretreatment is required, a high-efficiency pretreatment agent should be used. 6. Soft water or deionized water should be used as far as possible for reactive dye dyeing water, so as to reduce the influence of calcium and magnesium plasma in water on dyeing. 7. Pay attention to the pH value of the dyed cloth surface. Because under normal circumstances, the dyeing process of dark-colored cotton fabrics uses a high amount of alkali, and then strengthens washing, soaping and neutralization, and the fabric should not carry alkali, so as to avoid the hydrolysis of dyes after dyeing, resulting in a decrease in wet rubbing fastness. Usually, the pH value of the cloth surface is controlled at 6.5 to 7.5, and cannot exceed 9 or less than 3. 8. Use special auxiliaries, such as darkening agents, to finish dyed fabrics, which can reduce the amount of dyes to obtain a deep color effect, and at the same time improve the wet rubbing fastness. More about fabric rubbing color fastness tester: http://www.selaoduyi.com/productlist/list-5-1.html

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