Karft Paper Dye Liquid, powder Yellow Paper dye
In the dyeing process of papermaking, the object of the dye is the paper fiber. The action mechanism of dyes and different pulps is different. For example, basic dyes have a great affinity for lignin, which is suitable for pulp with high lignin content; the surface of pulp has strong negative charge, so it hardly adsorbs the negative ions of direct dyes. , with the reduction of solid surface charge, the dye is fixed close to the surface of the fiber. This adsorption is caused by non-electrostatic force. Aluminum vanadium is a commonly used dye retention agent in papermaking. Because most papermaking dyes are anionic, cationic aluminum compounds can form cationic precipitation with anionic dyes and be retained by adsorption on the fiber surface. , This mechanism occurs at pH 4.0-5.2, when the charge density of aluminum ions is high and the charge interaction is strong.
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