What Is The Deepening Mechanism of Silicone Oil (ii)? 2024-01-19
There are many dyes that can dye cotton fibers, such as reactive dyes, sulfur dyes, Shilin dyes, direct dyes, etc. Most of the black dyes are reactive black and sulfur black, especially sulfur black. Compared with reactive black, it has better fastness and better Deep color, especially environmentally friendly sulfur black is currently widely used. The sulfur black dye itself is insoluble in water. Under the action of the strong reducing agent sulfide alkali, the sulfur black can form a sodium salt leuco body and dissolve in the aqueous solution. This leuco body has strong directness to the fiber. After dyeing, the sulfur black dye itself is insoluble in water. After oxidation, it becomes an insoluble substance again and is firmly fixed on the fiber.
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