Compound reducing agent and reduction dyeing method

Abstract

The invention discloses a compound reducing agent with a stable chemical potential and not containing sodium hydrosulfite. The compound reducing agent is prepared from, by weight, 30-75% of thiourea dioxide, 60-20% of reducing sugar and 10-5% of one of sodium nitrite, acrylamide, furfural, cyclohexanone and trichloroacetic acid in a chemical potential control agent. By using the compound reducingagent, the dyeing process combining the pretreatment with the dyeing procedure is achieved, the treatment time is reduced, the production efficiency is improved, the dyed finished product is dyed uniformly, and the strength and hand feeling are improved.

Description

technical field

[0001] The invention relates to the field of dyeing, in particular to a composite reducing agent and a vat dyeing method. Background technique

[0002] Dyeing methods are generally divided into disperse dyeing, acid dyeing, reactive dyeing and other dyeing methods according to different dyes. The above dyeing methods mostly have the following problems: (1) Polyester is dyed with disperse dyes, and the light fastness is poor; after dyeing, reduction cleaning is required, and the color fastness of deep and thick colors is poor, and fades and grays after washing; When dyeing dyes, most of them need to use high-temperature process, and the cost of energy consumption is relatively high; disperse dyes are also prone to heat condensation, which is easy to cause defects such as color flowers and stains; There is a problem that it cannot meet the needs of consumers; the level dyeing property of nylon dyed with reactive dyes is poor, and high-temperature dyeing can ea...

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