Cellulose fiber fabric cationic modification and salt-free alkali-free dyeing method

Abstract

The invention relates to a cellulose fiber fabric cationic modification and salt-free alkali-free dyeing method. The method comprises following steps: adding soft water into a gas-liquid dyeing machine, adding cellulose fiber fabrics and a cationic modifier into the dyeing machine, starting the dyeing machine; adding sodium hydroxide into the dyeing machine from a material dissolving cylinder, adjusting the water level, running the dyeing machine, raising the temperature, discharging the modification liquid, washing the fabrics by a water solution of glacial acetic acid at a room temperature,taking out the fabrics, dehydrating the fabrics to obtain cation modified fabrics; adding soft water, adding cation modified cellulose fiber fabrics, dissolving active dyes, injecting the dyes into the dyeing machine, raising the temperature to the dyeing temperature, maintaining the temperature, discharging dyeing liquid, taking out the fabrics, and dehydrating and drying the fabrics. In the gas-liquid dyeing machine, cellulose fiber fabrics are modified under conditions: medium-low temperatures and a small bath ratio; the using amount of modifier is little; the surface and interior of fabrics are uniformly modified; the modified fabrics can be dyed without salt or alkali, furthermore, the dyeing time is short, the dyeing process is simple and controllable, the color is uniform and bright, and the color fastness meets the standards.

Description

technical field [0001] The invention relates to a method for cationic modification of cellulose fiber fabric and non-salt and alkali-free dyeing, in particular to a method for reducing the amount of modifier. technical background [0002] Cellulose fiber fabric has the advantages of moisture absorption, breathability, and skin-friendly, and is widely favored by consumers. Reactive dyes are the most important dyes of cellulose fibers, but during the dyeing process, due to the electrostatic repulsion between the hydroxyl anions of cellulose fibers and the anions of dyes, a large amount of inorganic salts must be present in the dyeing solution to carry out dyeing, including a large amount of inorganic salts The dyeing residue will bring serious environmental problems. The main method to solve this problem is to carry out cationic modification on cellulose fibers or fabrics to realize salt-free dyeing. [0003] To modify cellulose fibers, the modifiers used include high molecu...

AI Technical Summary

Problems solved by technology

However, the small molecule modifier is easy to hydrolyze and the effective utilization rate is low, so the dosage is large. When used for dyeing dark-colored modified fabrics, the dosage of the modifier is 16-45% owf or even higher, resulting in high modification costs.