Vat Orange Dyes
VAT dye refers to the reduction under alkaline conditions to color the fiber, and then by oxidation, on the fiber to restore the original insoluble stainer, used for dyeing cellulose fiber; The insoluble VAT stainer is made into sulfate sodium salt and changed into soluble VAT stainer, which is mainly used in cotton printing.
It is insoluble in water, dyeing to reduce solution in the alkaline strong reducing solution to leucotroph sodium salt can be infected with fiber, after oxidation, restore insoluble pigment lake and fixed on the fiber, generally washable, fastness to the sun is higher. Such as shilin blue and so on. The main cotton and polyester-cotton blended fabric dyeing; Nylon can also be colored; In the silk industry, it is used for rayon, rayon and rayon interweaving, and discharge printing of real silk.
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