Vat Brown 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 pigment is made into sulfate sodium salt and changed into soluble VAT pigment, 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 stainer 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.
Application of thermochromic materials
1.Coating: Suitable for all kinds plastic products’ surface coating Includs ABS, PE, PP, PS, PVC, EVA and other plastic materials.
Includs ABS, PE, PP, PS, PVC, EVA and other plastic materials.
2.Ink: Suitable for all types of printing, including screen printing, gravure and letterpress, can be printed on all kinds of materials, including
textiles,paper, synthetic film, glass, ceramics and wood,etc.
3.Plastic: The common grade plastic color masterbatch with high color concentration can be mixed with PE, PP, PS, PVC, EVA, PET and Nylon for
products’ injection and extrusion of products
Announcements for thermochromic pigments
1.Lightfastness: Keep it under the condition of drying and avoid light.Keep it in the refrigerator if the color change temperature is low.
2.Heat resistance: Thermochromic pigment can withstand high temperature of 230℃ in a short time (about 10 minutes)
3.Preservation: Under the above conditions, most varieties of thermochromic pigments do not degrade significantly after 5 years of storage.
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