Auxiliary-free dyeing method by use of disperse dye

Abstract

The invention belongs to the technical field of dyeing and finishing and relates to an auxiliary-free dyeing method by use of a disperse dye. The auxiliary-free dyeing method by use of the disperse dye comprises the following steps: (1) taking a high temperature resistant container, putting disperse dye and water into the container and sealing the disperse dye and the water in the container by use of a microporous membrane; (2) putting the sealed container into a dye vat for high-temperature and high-pressure dyeing, meanwhile, putting fibers (polyester fibers, acrylic fibers, polyamide fibers, polyurethane fibers, polypropylene fibers and the like) into the dye vat, dyeing the fibers by use of a high-temperature and high-pressure dyeing method, and then washing with water; (3) cooling the dye liquor in the container to room temperature and recovering the disperse dye by use of a suction filtration method. The auxiliary-free dyeing method by use of the disperse dye is simple in process and convenient to operate; no any auxiliary needs to be added during dyeing and the pollution to the auxiliary and the pollution to water caused by the auxiliary during dyeing are avoided, the sewage treatment difficulty is reduced, and the effects of energy conservation and environmental protection are achieved; besides, the dye in the residual liquor can be recycled.

Description

technical field [0001] The invention belongs to the technical field of dyeing and finishing, and relates to a dyeing method for disperse dyes without auxiliary agents. Background technique [0002] Disperse dyes are non-ionic dyes with simple structure, only containing some weak polar groups such as hydroxyl groups and amino groups, and low water solubility. They occupy an important position in the dye industry and are widely used. Due to the low solubility of disperse dyes in water, the dyeing rate is very slow, and it is difficult to dye. Therefore, various auxiliaries need to be added during dyeing. Nearly half of the current commercial dyes are auxiliaries. Appropriate auxiliaries can make the dyes evenly disperse in the dyeing solution with fine particles, and can improve the solubility of the dyes in the dyeing solution, speed up the adsorption speed of the dyes to the fibers, and some auxiliaries can also plasticize the fibers to a certain extent function to speed up...

AI Technical Summary

Problems solved by technology

However, during the dyeing process, these added auxiliaries make the dyes adsorb and accumulate on the surface of the fiber, resulting in a large amount of floating color. In order to improve the color fastness, it is necessary to perform reduction cleaning and a large amount of water washing on the fabric, which will not only prolong the process but also consumes a lot of water and energy

In addition, the added additives themselves will also pollute the water body, and after dyeing, the disperse dyes will be stably dispersed in the raffinate, resulting in chromaticity pollution and COD and BOD loads, and also increase the difficulty and cost

In the printing and dyeing industry, disperse dyes are the main dyes for the dyeing and printing of synthetic fibers, especially polyester fibers, which generate a large amount of polluted wastewater, which is difficult to treat and requires high treatment technology and cost.