Active-dye low-salt dip dyeing method for cotton fabric

Abstract

The invention relates to an active-dye low-salt dip dyeing method for cotton fabric. A one-step process employed by the technology is excellent in dyeing effect, and in the one-step process technology, a salt substitute is applied to a pretreatment technology, pretreatment does not need individually performing, and the processing process is shortened and water and energy are saved. Also, BOD5 and CODCr of a processing raffinate of the one-step process technology are reduced compared with routine pretreatment, and the one-step process technology is environment-friendly. The low-salt dyeing technology is capable of reducing the usage amount of anhydrous sodium sulfate in the dyeing process by 50%, is excellent in dyeing effect, has the dyed fabric K / S value higher than that of a routine dyeing technology, and is uniform in obtained color. The soaping fastness and the perspiration fastness are both high and are both 4-5 grade or more, the solarization fastness is 4 grade or more, and the dry / wet friction fastness is 4 grade or more. The improving capacity of the low-salt dyeing technology is better than that of a routine dyeing technology, in other words, the usage amount of a dye is less when same chroma is obtained, and the dye uptake of the low-salt dyeing technology is far higher than that of a routine dyeing technology.

Description

technical field [0001] The invention relates to the field of textiles, in particular to a cotton fabric reactive dye low-salt exhaust dyeing method. Background technique [0002] Cotton fiber occupies an important position in the textile industry worldwide. The most important and potential dyes currently used in cotton fiber dyeing are reactive dyes, because the color brilliance and wet fastness of cotton dyed by reactive dyes are both better. [0003] When reactive dyes are dyed, they are ionized into dye anions and sodium ions in the dye solution. Cellulose is a polysaccharide compound formed by connecting β-D-glucose residues through 1,4-glycoside bonds. Cellulose molecules can be ionized to form Cell-O anions. - . There is Coulomb repulsion between dye anion and cellulose anion, sodium cation and Cell-O - Combined, reducing the concentration of sodium ions in the dye solution. The difference in sodium ion concentration forms an energy barrier between the fiber surfa...

AI Technical Summary

Problems solved by technology

From an ecological point of view, printing and dyeing wastewater with high salt content will lead to the destruction of the ecological environment, and the large amount of inorganic salt added in the dyeing process cannot be treated by simple physical, chemical and biochemical methods.

The discharge of waste water with high salt content will directly change the water quality of rivers, lakes, and destroy the ecological environment of the water; at the same time, the high permeability of salt will lead to salinization of the soil around rivers, lakes and printing and dyeing factories, reducing the yield of crops

Therefore, the addition of salt will lead to deterioration of water quality, damage to the ecological environment, and great harm to water, organisms and soil.