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It refers to a class of acid dye staining dye in an acidic medium. Acid dyes according to the different chemical structure and stained into the premise strongly acidic, weakly acidic, acidic media, acid complex dyes.
This is carried out in an acidic medium staining dye. Most acid dyes containing sodium salt, can be dissolved in water, bright luster, chromatography is complete. Mainly for wool, silk and nylon and other staining it can be used aspect leather, paper and ink. Cellulose fibers are generally no coloring. Acid dyes according to the different chemical structure and stained into the premise strongly acidic, weakly acidic, acidic media, acid complex dyes. Strong acid dyes first developed an acid dye staining requires a strong acidic dye bath, its molecular structure simple, low molecular weight, containing a sulfonic acid group or a carboxyl group, the pro-third-less wool on wool can spare shift, dyed average, it is also known as Acid leveling dyes, but not deep shade, wash fastness is poor, and when there is damage dyeing wool, dyed wool feel poor. Weak acid dyes in a strongly acidic dyes by increasing the molecular weight, the introduction of an aryl group or a sulfone group such as the introduction of long carbon chain method that is inherently weak acid dyes. Molecular structure is more complex, larger work together pro-wool, wool can be dyed in acid medium, no damage to the wool, deep shade, fastness some progress, but uneven coloration. Mordant dyes with certain metal salts (such as chromium salts, copper, etc.) after mordant treatment on the fabric forming the metal complex acid dyes.
Mordant relatively complicated procedure, but it can get light fastness, washing, rubbing fastness of dyed products function better. Acid complex dye complex by certain acid dyes and chrome, cobalt and other metals together. Soluble in water, its dye products Fast, light performance is excellent. It dye precursor and acidic mordant dyes similar, but in the preparation of dyes, azo dyes have metal atoms into molecules, metal atoms and dye molecule ratio of 1: 1, so called 1: 1 metal complex dyes. Not need to use mordant dyeing process. Such as acid complex Yellow GR (ie C.I. Acid Yellow 99). Another acid complex dye molecules do not contain sulfonic acid groups, which contain sulfonamido and other hydrophilic groups in the molecule and the dye molecules metal atom ratio of 1: 2, it is also known as 1: 2 metal complex dyes. It is in a neutral or weak acid medium staining, so called neutral dyes. Such as neutral gray 2BL (ie C.I. Acid Black 60). Acid dyes are azo, anthraquinone, triarylmethane type, etc., but the big department belong to azo dyes. Production and general dye acid complex dyes are similar, but necessary step to increase the metal complex processes, such as neutral gray 2BL, start with 2-aminophenol-4-sulfonamide diazotization, and 1-acetyl-amino-7 – naphthol coincidence, then use sodium salicylate chromium complex formed. For more information about acid dyes go to website: www.cycolorant.com