Dyeing method of reactive dye with high color fixation rate

Abstract

The invention discloses a dyeing method of a reactive dye with a high color fixation rate. The dyeing method comprises the following steps: S1, pretreatment: padding a texture to be dyed in a finishing solution containing chitosan quaternary ammonium salt, dipping for two times, rolling for two times, prebaking at the temperature of 80 to 100DEG C, baking at the temperature of 110 to 130DEG C, washing with cold water and then drying; S2, reactive dyeing: immersing into a dyeing solution of the reactive dye, dyeing at the temperature of 20 to 30DEG C, raising the temperature to be 50 to 70DEG C, then adding an organic solvent B, and raising the temperature to be 80 to 100DEG C; adding sodium carbonate according to the volume of the dyeing solution of the reactive dye, insulating heat and reducing to room temperature; S3, performing after treatment, water washing, soaping, water washing and drying in air. The dyeing method of the reactive dye with the high color fixation rate, provided by the invention, has the advantages of high color fixation rate and good level-dyeing property; in addition, the process is simple, and industrial implementation is easily realized; meanwhile, chemical substances with high price and greater toxicity are prevented from being used.

Description

technical field [0001] The invention relates to the technical field of dyeing, in particular to a reactive dye dyeing method with high color fixation rate. Background technique [0002] Reactive dyes are named because the dye molecules contain reactive groups that react with fibers, and can also be called reactive dyes. Reactive dyes are the most important type of dyes for cellulose fiber dyeing due to their bright color, complete chromatogram, and excellent wet fastness. However, the dyeing fixation rate of reactive dyes is low, and the utilization rate of dyes is not high, especially for deep dyeing. When the dye concentration is greater than 3% o.w.f.), the color fixation rate of the dye is generally around 50-80%, that is to say, 20-50% of the reactive dye does not react with the fiber and is wasted. Waste increases the cost, and it is difficult to treat the discharged high-color wastewater, which is not conducive to environmental protection. [0003] In recent years, ...

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Problems solved by technology

Dyes with high directness and high fixation rate are not easy to be washed off after hydrolysis, which will affect the color fastness and uniformity of dyeing; dyeing under low-alkali or neutral conditions requires the development of new dyes or changes in the dyeing process, such as increasing temperature and Increase electrolyte concentration; cold-batch dyeing technology can increase the utilization rate of dyestuff by 10-15%, but the control requirements for the production process are strict, the controllability of shade is poor, and the residual sodium hydroxide can easily cause the fabric to feel hard and tear strength to decrease, etc. Defects; low liquor ratio dyeing can reduce the amount of salt used and increase the dye uptake rate, but the requirements for equipment are high; a large number of neutral electrolytes can easily cause salt pollution; fabric pretreatment modification has better wet fastness , but the shade will become darker and the light fastness will decrease; the use of cationic color fixing agent can increase the dyeing depth of the fabric, but it will reduce its wet rubbing fastness; reactive color fixing agent will release formaldehyde, and the wet rubbing fastness is still not ideal , color change and other issues

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