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Environmentally-friendly oxygen bleaching stabilizers and environmentally-friendly chelating agents. Compounds that have been used more in oxygen bleaching stabilizers and chelating agents in the past include nitrogen triacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA) and diethylenetriamine Acetic acid (DTPA), etc., although they have good effects, they have very poor biodegradability after chelating metals; therefore, European laws have banned their use in recent years, and newly developed diethylenetriamine pentaethylene phosphonic acid (DTPMP), Environmentally friendly chelating agents such as sodium acrylate (PASS), this new additive has strong metal ion complexing ability and excellent descaling effect, is also easy to biodegrade, and will not cause environmental pollution. At present, the products that have entered the market include PrestogenPL, Mirokai54H and so on. The chelating agent S produced in my country is also an environmentally friendly chelating agent composed of organic phosphonates as the main material and supplemented by special synergistic ingredients, and its performance has reached the level of similar foreign products.
Biological enzyme preparations are used for fabric pre-treatment, and they are easily degraded, which has little impact on the environment. At present, amylase has been used for desizing treatment, cellulase is used for smoothing and weight reduction, and pectinase and cellulase are used for scouring of cotton fiber. The main products in this area are Cellusoft, a cellulase, used for smooth and soft finishing of cotton, linen, Tencel and other fabrics; BioPrep, a pectinase, used for scouring of cotton, can replace the traditional strong Alkaline cooking process; IND-80L, also a pectinase, used for cotton scouring; IND-88L, a cellulase, can form a composite enzyme with IND-80L for cotton scouring. For example, the use of a composite enzyme composed of pectinase IND-80L and cellulase IND-88L for enzymatic-hydrogen peroxide scouring and bleaching of cotton fibers can obtain the same wetting effect, dyeability and uniformity as the traditional alkali-hydrogen peroxide scouring and bleaching process. Dyeing <5>.
Environmentally-friendly dispersants are most commonly used in the field of dispersants are the condensates of sulfonic acid compounds of naphthalene and its homologues and formaldehyde, such as dispersant NNO, dispersant MF, dispersant CNF, etc. These products are produced in the manufacturing process Only 25% and 30% of the wastewater can be biodegraded during treatment. In recent years, the German BASF company has successfully developed a new environmentally friendly dispersant SetamolE, which is a mixture of aromatic sulfonic acid and sodium carboxylate. In addition to excellent dispersibility, it also has good biodegradability. It has been widely used in dye applications. In addition, the application of lignosulfonate dispersants, such as dispersant W, is also expanding.