Phosphorus-free liquid substitute alkali and preparation method

Abstract

An embodiment of the invention provides phosphorus-free liquid substitute alkali and a preparation method. The phosphorus-free liquid substitute alkali which is high in color yield, stable in color light and convenient to use is obtained by compounding of an alkali supply agent, a buffering agent and water in an appropriate proportion, problems in independent use of sodium carbonate at present aresolved, and the problem of fixation of traditional sodium carbonate is solved. Consumption of the phosphorus-free liquid substitute alkali is only 10-20% of that of sodium carbonate, and low consumption is realized. Compared with other solid substitute alkalis, the phosphorus-free liquid substitute alkali has advantages that convenience in feeding is achieved, high solubility is realized, alkaline agents on cloth surfaces can be easily washed and removed after dyeing, low water consumption in washing is realized, and phosphorus is avoided, so that water eutrophication is avoided.

Description

Technical field [0001] The invention belongs to the technical field of dyeing and finishing, and specifically relates to a non-phosphorus liquid substitute alkali and a preparation method. Background technique [0002] Reactive dyes, also known as reactive dyes, are a new type of water-soluble dyes that appeared in the 1950s. The molecules of reactive dyes contain reactive groups that can react with hydroxyl groups in cellulose and amino groups in protein fibers. The fibers form covalent bonds. Reactive dyes have the characteristics of bright colors, good level dyeing, simple dyeing method, high dye fastness, complete chromatogram and low cost. They are mainly used for dyeing cotton, linen, viscose, silk, wool and other fibers and their blended fabrics. And printing. [0003] The dyeing process of reactive dyes includes two stages: dyeing and alkali fixation. Electrolyte is needed to promote dyeing when dyeing, and alkaline agent is needed to make dye and fiber react when dyeing....

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Problems solved by technology

Although the color fixing effect of soda ash is good, there are the following disadvantages: (1) the amount of soda ash is large, the maximum amount of the exhaust dyeing method reaches 25-40g / L, and the pad dyeing method is 35-45g / L. After the color fixing is completed, the soda ash all enters the waste water, causing The degree of wastewater pollution has increased greatly, and the load and cost of wastewater treatment have increased; (2) Soda ash is used as an alkali agent, and the chemical material is not thorough enough to easily cause alkali spots; (3) When alkali is added to the dyeing bath, it is easy to form "stone alkali" hard blocks Or crystal particles, the light ones cause fabric scratches, the severe ones block the pipeline, and even cause the circulation pump to be damaged; (4) Soda ash remains on the fabric after dyeing is extremely difficult to wash, and it takes a lot of water to wash it, and the water consumption is large. Improper cleaning will cause defects in the subsequent process of applying color fixing agent, softener, etc.

Generally speaking, the current substitute alkalis have a low fixation rate for some dyes, the shade of dyed fabrics has a large deviation from that of soda ash-fixed fabrics, and some products contain phosphorus-containing buffers that can cause eutrophication of water bodies

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