Processing method of salt-free dyeing through activated dye

Abstract

The invention relates to a processing method of salt-free dyeing through activated dye, which includes the steps of: (1), acid pickling and enzyme washing of cotton fabric after the pretreatment of scouring and bleaching; (2) mixing water with organic solvent at volume ratio of (1:4)-(1:9) to form a mixed solution, and then adjusting the pH value of the mixed solution; and (3)dyeing the pretreated cotton fabric in 20-30 DEG C activated dye by using the mixed solution, then carrying out water scrubbing, acid pickling, soaping, hot-water scrubbing, color fixing and softening on the dyed cotton fabric, and finally recovering the solvent. With the processing method, the adsorption rate and the equilibrium adsorption amount of the activated dye are improved, and environmental and ecological problems caused when large quantity of inorganic salt is used are completely solved. In the dyeing process, the input of inorganic salt is omitted, so the operational techniques and the labor intensity in the dyeing process are effectively simplified and the production cost is reduced. Through a solvent recovery system, the solvent contained in the dyeing residue of the hydrosolvent is recovered for cycle use. Therefore, the recovery and the recycling of the resource are realized, the production cost is saved and the pollution to the environment is alleviated.

Description

technical field [0001] The invention belongs to the field of dyeing methods of reactive dyes, in particular to a salt-free dyeing method of reactive dyes. Background technique [0002] One of the main problems of reactive dyeing is the low utilization rate of dyes, which has become an important problem hindering its development. In order to overcome this shortcoming and promote dyeing, a large amount of neutral electrolyte needs to be added during dyeing. Generally, the dosage of salt or sodium sulfate is 30-100g / L. Although the added neutral electrolyte improves the utilization rate of the dye and reduces the mass fraction of the dye in the sewage, the discharge of the printing and dyeing wastewater with high salt content destroys the ecological environment of the water. The high permeability of salt leads to salinization of the soil around rivers and lakes, reducing the yield of crops, and a large amount of environment polluted by inorganic salts cannot be treated by simp...

AI Technical Summary

Problems solved by technology

There are still some difficulties in these methods on trial, such as: there is still a certain gap in the fixation rate or color fastness of high direct dyes, and the price is much higher than that of ordinary dyes, and the types are limited; the level dyeing of small liquor ratio dyeing has always been difficult Overcome; "substitute salt" can reduce environmental pollution, but to achieve the same color depth, it is necessary to increase the amount of organic salt, and organic salt is much more expensive than inorganic salt, which increases the cost of dyeing, although the amount of salt can be reduced, pollution It is larger than inorganic salt; while the modification of cotton fiber usually affects the shade and level dyeing of the fabric, and the light fastness is also reduced