A group of compounds for stabilizing the reduction potential and dyeing performance of sulfur dyeing systems and methods of use thereof

Abstract

The invention relates to a group of compounds for stabilizing the reduction potential and the dyeing performance of a sulfur dye dyeing system, and a use method thereof. 0.1-20.0 wt% of an organophosphate compound is added to a sulfur dye / glucose / sodium hydroxide system, and then the obtained system is used for sulfur dye dyeing. A sulfur dye forms a soluble leuco compound under the reduction effect of a glucose / sodium hydroxide system, cellulose fibers are dyed with the soluble leuco compound, and the organophosphate compound is added to effectively stabilize the reduction potential in the reduction system and realize the stability of the dyeing performance. Compared with organophosphate-free reduction systems, the reduction system reduces the reduction potential reduction rate after 6 hprolongation at 90 DEG C to 1-2% from 6-8%, improves the color depth by 20% or more, basically keeps the color tone and the dye depth of a fabric basically stable. An effective way is provided for solving environmental pollution in the dyeing process of the sulfur dye and realizing the continuous and stable industrial application of glucose in the dyeing process.

Description

technical field [0001] The invention belongs to the field of textile dyeing, and in particular relates to a group of compounds used for stabilizing the reduction potential and dyeing performance of a sulfur dyeing system and a use method thereof. Background technique [0002] Sulfur dyes are one of the main dyes in the application of cellulose fiber dyeing, and their annual consumption ranks second after reactive dyes. Sulfur dyes are cheap, have good light fastness and washing fastness, strong applicability, do not contain azo groups, heavy metals and adsorbable organic halides, are non-allergenic and carcinogenic, and are considered to be a non-toxic dye. The most important dye for dyeing dark-colored fabrics such as blue and black. [0003] Sulfur dye itself is insoluble in water and cannot be dyed on fibers. When dyeing, it is necessary to add a reducing agent to reduce it to a water-soluble form that has an affinity with the fiber-leuco. After dyeing the fiber, it will...

AI Technical Summary

Problems solved by technology

However, the use of sodium sulfide as a reducing agent has serious pollution problems: (1) toxic hydrogen sulfide gas is produced during the dyeing process, which can cause dizziness, heart palpitations, nausea when reaching a certain level in the air, pollute the environment, and damage the health of dyeing workers , The hydrogen sulfide gas in the workshop seriously damages the electronic components, and the hydrogen sulfide smell remaining on the fabric affects the follow-up processing and the health of consumers

(3) S in wastewater 2- higher concentration, S 2- It is a biochemical toxic substance, which can easily cause the collapse of the wastewater treatment system. The wastewater cannot be fully treated by the activated sludge method and the coagulation sedimentation method, and the discharge water quality is difficult to meet the requirements.

Reducing sugars include arabinose, fructose, galactose, glucose, lactose and maltose, etc. Among them, glucose is used more. For example, Guan Chao and others use various reducing sugars in sulfur dyeing and dyeing. The reducing agent produces liquid sulfur black dye and has applied for a patent (CN102108215A). This kind of reducing sugar material can be biodegraded. Compared with sodium sulfide, it does not produce hydrogen sulfide gas, but the reduction potential is unstable, resulting in continuous pad dyeing production. Fluctuation, while the color depth and saturation of the dyed fabric is not as good as sodium sulfide

When thiourea dioxide is used as a reducing agent, the dyeing discharge liquid has lower toxicity, is more friendly to the environment, and is easy to biodegrade. However, thiourea dioxide is more expensive than sodium sulfide, and the depth of dyeing is far less than that of sodium sulfide, which cannot meet the requirements of fabric dyeing performance.

In order to improve the dyeing performance of glucose in the industry, some manufacturers use glucose mixed with thiourea dioxide, hydrosulfite, etc., but the problems of reduction potential and dyeing stability have not been resolved.

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