Requirements for complexing agents in printing and dyeing industry:a. Efficient chelation, dispersion and suspension.
b. It has good complexation under different PH values. (EDTA is suitable for acidic medium and neutral medium but not alkaline medium; sodium hexametaphosphate has better complexing force in acidic medium)
c. Strong scale inhibition and scaling function.
d. No surfactant. (e.g. compounding anion surfactant, problems of the dyeing acrylic fibers, etc.)
e. High temperature resistance, not even happening decomposition at 200 ℃; acid resistance, alkali resistance, oxidant resistance, reductant resistance; use without damage to textiles. f. It can be biodegraded, which does not pollute the environment, and is non-toxic to human body. (EDTA, diethylenetriamine pentaacetic acid [DTPA] and phosphates should be banned)
j. It has strong complexation effect on nonferrous metal ions, such as Fe3+, Cu2+, Zn2+ and so on. At present, some commercial chelating agents chelate metal ions temporarily. With time prolonging and temperature rising, metal ions are released, which makes sensitive colors such as Cui Lan, Yan Lan, Bao Lan and Brilliant Green aggregate under the induction of metal ions, leading to color flowers.
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