Method Of Improving Color Fastness To Wet Rubbing

In textile products, the main factors that affect the color fastness to moisture are fabric types, fabric structure, pretreatment, such as desizing, boiling, bleaching, mercerizing and so on.

The selection of dyes, the control of technology, temperature, time and so on are strict, and the selection and use of auxiliaries are correct.

In view of these factors that affect the color fastness to moisture and rubbing, we should pay attention to the following points:

1. According to the analysis of textile materials, the chemical fiber fabric has better wet and rubbing fastness than cotton and other fabrics. The rarefied fabric is better than the heavy fabric.

Therefore, in the process of textile processing, all processes should be treated evenly to enhance the absorbability of fibers and the reactivity or adhesion of dyes, so that dyes can be fully dyed.

In dyeing process, strict control is required and proper use of auxiliaries should be correctly chosen.

In order to improve the moisture fastness of textile products, it is possible to carry out full soap washing in textile post-treatment, such as dyeing polyester fibers with disperse dyes at high temperature, causing dye swimming to move to the surface of the fiber, resulting in a decrease in rubbing fastness.

In view of this situation, the reinforcing agent or smoothing agent can improve the color fastness to rubbing to a certain extent.

2. When choosing dyes, the dyes with good lifting and levelling properties are selected. Good promotion and levelness are good for the dye penetration and diffusion, and can improve the wet rubbing fastness to a certain extent.

Dyes should be water-soluble and direct, and water soluble groups should not be too large. Otherwise, the wet rubbing fastness will be affected.

Directness should also be chosen as the best medium.

The dyestuff should not be too high, and should be more than 70% in general.

3, cotton and other natural fabrics are relatively poor color fastness to wet rubbing, so for cotton grey cloth, we should choose a uniform fabric with a smooth cloth and a clean cloth.

If pretreatment is needed, high efficiency pre-treatment agents should be selected.

4, reactive dyes should be treated with soft water or deionized water as water, so as to reduce the influence of calcium and magnesium ions on the dye in water, thereby enhancing the absorbency of the dye to the dye, so that the dye becomes more stable in the fiber molecules.

5, the use of efficient fixative, the selected fixative should be able to link between dyes and fibers to form compounds, in reaction with dyes, and can react with cellulose fibers cross-linking, so that dye and fiber can be closely linked together, to strengthen the dye and fiber combination, to prevent dye from the fiber off or swim to the surface of the fiber, to avoid causing a decrease in color fastness.

6. Using special auxiliaries, such as deep agents, to finish dyed fabrics can reduce the dye dosage and obtain the deep shade effect, and at the same time improve the color fastness to wet rubbing.

7, pay attention to the pH value of the fabric after dyeing.

Because in general, the dyeing process of deep colored cotton fabric has a high alkali content, and then strengthens the washing, soaping and neutralization, and the fabric can not be carried with alkali, so as not to dye the dye after hydrolysis, resulting in a decrease in wet rubbing fastness.

Usually the cloth pH is controlled at 6.5 to 7.5, and cannot exceed 9 or less than 3.

8, starting from improving the characteristics of the dyed fabric, finishing the fabric, such as biological enzyme polishing, will increase the smoothness of the cloth and reduce the friction, thus improving its wet rubbing fastness.

9. The floating color on the fiber is extremely unfavorable to the color fastness to wet rubbing. Deep dyed reactive dyed fabrics should be soaped two times. However, too many times of soaping will destroy the dyestuffs that have been dyed, resulting in a breakage phenomenon, resulting in a decrease in the effect.

A test was conducted to wash dyed fabrics with detergent (2-3g/L, 95 10min), so that the wet rubbing fastness can reach 3.

In actual production, a lot of conditions often occur, such as the fluctuation of steam pressure, which causes the temperature to rise within a specified time. If the operation of the truck is wrong or the equipment fails suddenly, the predetermined procedure will deviate, and the dye will be added to the dyestuff after the chromatic aberration.

For some chemicals and dyes and alkaloids, it is not practical to clean the dyestuffs in large production, so we should choose reasonably.

10, because the reactive dyes are difficult to remove after dyeing, it is very difficult to remove the color. Therefore, after the soap is boiled, appropriate stripping agents can be used to remove the color and remove the floating color, so that the fabric and the fibers after removing the floating color will form a complete integration, thereby enhancing its wet rubbing fastness.

11, for reactive dyes and

The covalent bond formed may become unstable or even fractured under the condition of acid or alkali. We can form a soft, tough and water resistant film on its surface, and improve its wet rubbing fastness with its water repellency and soft smoothness.

Sol-gel method (Sol Gel method) is an important method to prepare inorganic membrane. Through sol-gel technology, different components of the film can be formed on the fabric, which can improve the wear-resisting strength and water repellency of the fabric, and so on, which can improve the wet rubbing fastness to a certain extent.

But it has a strong influence on the handle.

It is reported that the mixture of YKA2955 and YKA2977 developed by the Japanese side grease company, using a mixture of 4: 1, is used for impregnation of reactive dyestuffs to form a soft and tough film on the surface of the fabric, thereby enhancing the wet rubbing fastness.