METHOD OF COLD DYEING WITH INSOLUBLE AZO COLOURANTS OF FIBROUS MATERIALS Russian patent published in 2012 - IPC D06P1/02 D06P3/22 C09B29/00 

FIELD: textile industry.

SUBSTANCE: invention can be used the most effectively in the field of dyeing and finishing works to increase the range of colours when colouring with insoluble azo colourants of fabrics from natural fibers. The cold dyeing method with insoluble azo colourants of fibrous materials of natural fibers is carried out by impregnating with the solution of azo dyestuff component followed by treatment with a diazonium salt. As azo dyestuff component the solution of methyl phloroglucinol is used with a concentration of 5 g/l, soaking with it is carried out for five minutes at a liquor ratio 1:20 at a temperature of 50-60°C, diazonium salt is used at a concentration of 10 g/l and processing with it is carried out for 20-25 minutes at 10-15°C.

EFFECT: invention enables to simplify dyeing of fibrous materials, to recycle unusable explosives.

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