1. Water treatment film

The printing and dyeing industry requires the use of soft water except for individual processes, so a chelating agent can be added to chelate metal ions in the water to achieve the purpose of softening the water.

Second, desizing film

    In the sizing of textile mills, heavy metal compounds are added for anticorrosion. The addition of these compounds is not conducive to enzyme desizing, and the addition of chelating agents can chelate these metal ions. In addition, when the chemical fiber is desizing, the use of a chelating agent can make the slurry easier to puff, detach from the fiber and disperse into a colloidal form for removal, and at the same time the strong dispersing power of the chelating agent can also prevent impurities and slurry from being deposited on the fiber again This makes the base fabric whiter, the desizing is more complete, and the equipment is cleaner.

3. Bleaching

    Oxygen bleaching is commonly used in factory fabric bleaching.In the hydrogen peroxide bleaching bath, metal ions such as Fe2 +, Fe3 +, Mn2 +, Cu2 +, Ni2 +, etc. brought by the equipment pipeline and aqueous solution will accelerate the decomposition of hydrogen peroxide, resulting in local excessive oxidation of textiles during the bleaching process Strong decline, even holes. Adding chelating agents to textile bleaching can effectively block metal ions, indirectly control the decomposition rate of hydrogen peroxide, and prevent textile damage. Chelating agents are used for washing after bleaching, which can promote the removal of impurities degraded during the bleaching process from the fiber surface. When bleaching with hydrogen peroxide, sodium silicate is commonly used as an oxygen bleaching stabilizer. Silica scale will be generated after long-term use. If a chelating agent is added, it can prevent silicate crystals from depositing on the equipment. Clear.

Third, scouring

    Adding a chelating agent in the scouring process can chelate and disperse the calcium and magnesium ions in the scouring solution, which is beneficial to the removal of pectin and prevents the deposition of insoluble calcium and magnesium salts on the fabric, thereby improving the hair effect and eliminating calcium spots. , Greatly improve the scouring effect, improve the levelness of dyeing.

Four, dyeing

    The dispersing, complexing, and electrostatic repulsive effects of the chelating agent can help the dye dissolve, increase its diffusion rate, and allow the dye to diffuse fully and evenly in a shorter time and dissolve in the dye liquor, thereby dyeing the fiber. In the dyeing process, the presence of Ca2 +, Mg2 +, Cu2 +, Fe3 +, Al3 + and other metal ions in the dyeing bath will denature the dye and affect the dyeing performance, while the addition of chelating agents can prevent its effect, complexing some of the dyeing solution Metal ions and impurities form stable complexes, reduce the association of dyes, avoid the occurrence of stains and other defects, and indirectly play the role of level dyeing.

Chelating and dispersing agent uses

Textile industry:

A. Desizing Add chelating agent to the desizing liquid, no matter which desizing method is used, the desizing efficiency can be greatly improved. This is because after complexing the metal ions that react with the slurry, the swellability of the slurry film is improved, and the reactivity of the slurry and the desizing agent is improved, so that it is easily removed from the fabric.

B. Pre-treatment It is mainly used as a stabilizer for hydrogen peroxide bleaching, to control the slow and smooth decomposition of hydrogen peroxide, and to improve the utilization rate of hydrogen peroxide; at the same time, it can prevent local violent decomposition caused by metal ions, causing fabric fibers to break and form holes.

C. Dyeing The water, thenardite, soda ash, sodium chloride, etc. used in the dyeing process all contain certain impurities. Under the influence of the impurities, the dye will cause precipitation. Especially when dyeing bright colors, adding a chelating agent can make the color more vivid, and it has no adverse effect on the rubbing fastness and level dyeing of the dye. When dyeing with sulfur dyes, it can prevent the effect of copper mirror.

Circulating water scale inhibition:

In water treatment, chelating agents are needed as scale and corrosion inhibitors for circulating cooling water and boiler water, especially for oilfield water injection and cooling water containing high barium carbonate, and boiler water.

Paper industry:

The reaction caused by metal ions in the pulp bleaching process precipitates scale, the bleach is ineffectively decomposed, the pulp returns to yellow and other adverse consequences. In the pulp bleaching process, a chelating agent is also needed to reduce the side effects of bleaching and avoid Fe3 + ions and phenol groups in the pulp The reaction forms a dark colored compound, protects the fibers, improves the whiteness of the pulp, and reduces the yellowing of the pulp.

Cleaning area:

Whether it is in daily cleaning products such as industrial cleaning or civilian washing powder, a chelating agent is needed to improve water quality and improve the cleaning effect.