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When dyeing acrylic fibers with cationic dyes, uneven dyeing is often observed. This is because cationic dyes have a rapid dyeing rate but slow diffusion speed. To achieve uniform dyeing, the current approach involves the addition of cationic leveling agents to effectively control the initial dyeing rate of cationic dyes.

Due to their positive charge, cationic surfactants can be attracted and adsorbed onto the anionic dye sites on acrylic fibers. This impedes the dyeing process of cationic dyes. During the heating stage, the leveling agent gradually disassociates, allowing the cationic dye molecules to slowly dye the dye sites, resulting in a high dyeing rate and uniform coloration. Commonly used cationic leveling agents include Dodecyl benzyl dimethyl ammonium chloride, Dioctadecyl dimethyl ammonium chloride, and Dodecyl trimethyl ammonium chloride.

Dodecyl benzyl dimethyl ammonium chloride is a novel type of leveling agent for acrylic fiber dyeing that exhibits superior leveling effects compared to the currently most used Dodecyl benzyl dimethyl ammonium chloride and Dodecyl trimethyl ammonium chloride. It is gradually replacing older products and finding increasingly extensive application.

Furthermore, Dodecyl benzyl dimethyl ammonium chloride can also serve as an assistant agent for polyester fiber dyeing. When performing ultrasonic dyeing of polyacetate fibers, employing ultrasound, Dodecyl benzyl dimethyl ammonium chloride as the assisting agent, and disperse dyes such as Diethyl amino azobenzene, it is possible to achieve 100% dye uptake and ensure uniform colorfastness of the polyacetate fabric. Favorable results can also be obtained using Dodecyl benzyl dimethyl ammonium chloride.