The application of indigo dye has a history of more than 5000 years and is considered to be the oldest dye.Our factory now uses the most advanced equipment and production technology to produce indigo blue, to ensure that our indigo blue products are of the best quality, and the color light meets the requirements of the international garment and jeans industry standards, with a view to reaching the international level, making jeans more outstanding, and making jeans fashion a more popular element.
(1) Production method
Metal sodium reacts with potassium salt and caustic soda liquid to generate indoxyl, water reacts with air to generate indigo blue, and then washes it into filter cake through plate and frame, and then granulates the slurry through spray tower with additives
(2) Solubility
Slightly soluble in water, ethanol, glycerin and propylene glycol, insoluble in oils and fats. The 0.05% aqueous solution was dark blue. 1g is soluble in about 100ml, water at 25 ° C, the solubility in water is lower than other edible synthetic pigments, and the 0.05% aqueous solution is blue. Soluble in glycerin, propylene glycol, slightly soluble in ethanol, insoluble in oil. In case of concentrated sulfuric acid, it is dark blue, and after dilution, it is blue. Its aqueous solution plus sodium hydroxide is green to yellowish green. Indigo is easy to color, has a unique color tone, and is widely used. Heat resistance, light resistance, alkali resistance, oxidation resistance, salt tolerance and bacterial resistance are both poor. Fading when reducing, such as reduction with sodium sulfoxylate or glucose, it becomes white. The maximum absorption wavelength is 610 nm ± 2 nm.
(3) Application
It is mainly used to dye cotton fibre .The pop "cowboy" clothes mostly are made by indigo blue dying longitudinal yarn and white yarn interweaving;It can be used with sulfurated coloring matter;Also we can get indigo white,bromized indigo blue from it,they are well used in food coloring matter, biochemistry etc.
Post time: Oct-28-2022