A blue, almost cyan. The original "red, orange, yellow, green, blue, blue, purple" has been replaced by "red, orange, yellow, green, blue, indigo and purple", blue powder (maybe dark blue), odorless. Slightly soluble in water, ethanol, glycerol and propylene glycol, insoluble in oil. A 0.05% aqueous solution is dark blue. 1g is soluble in about 100ml of water at 25°C, and its solubility in water is lower than that of other edible synthetic pigments. The 0.05% aqueous solution is blue. Soluble in glycerol, propylene glycol, slightly soluble in ethanol, insoluble in oil. It is dark blue in case of concentrated sulfuric acid, blue after dilution, and its aqueous solution is green to yellow-green when sodium hydroxide is added.
Indigo Material Use
Mainly used for the dyeing of cotton yarn, cotton cloth, wool or silk, this pigment is the pigmented product of the important vat dye indigo, has excellent light fastness, weather fastness and heat stability, gives blue tone, and can be A liquid dispersion dosage form is prepared, which is mainly used in the coloring and printing of viscose fiber puree. For biochemical agents and indicators and dyeing of cotton yarn, cotton cloth, wool or silk, etc.
Application Fields of Indigo Materials
It is used for coloring of food, medicine and daily cosmetics. Edible indigo is an edible synthetic coloring. Food coloring is a class of additives used for food coloring, including synthetic and natural colors, with a total of more than 60 kinds.
Working Principle of Indigo Special Vacuum Dryer
The vacuum dryer is a double-conical rotary tank. In the vacuum state, the medium is passed into the jacket for heating, and the heat contacts the wet material through the inner wall of the tank. The water vapor evaporated after the wet material is absorbed is evacuated by the vacuum pump through the vacuum exhaust pipe. Since the tank is in a vacuum state, and the rotation of the tank makes the material turn inside and outside, the drying speed of the material is accelerated, the drying efficiency is improved, and the purpose of uniform drying is achieved.
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