Deep color dyeing and finishing technique of poly lactic acid (PLA) fiber and gossamer fiber blending fabrics

Abstract

A deep color dyeing and finishing technique of poly lactic acid (PLA) fiber and gossamer fiber blending fabrics comprises the following steps of greige cloth sewing, preliminary shaping, preliminary treatment, dyeing, fixation, dehydration and an after treatment process. The deep color dyeing and finishing technique of PLA fiber and gossamer fiber blending fabrics uses a dual-bathing method to dye. A mesotherm type disperse dye is used for dyeing (enabling color to be deep) PLA fibers, and a carrier is added during dyeing. An environment-friendly mesotherm direct dye is used for dyeing (enabling color to be deep) gossamer fibers, fixation treatment is carried out after dyeing, fibers with two components can be dyed into a deep color simultaneously, and strength and feeling of the PLA fibers and the gossamer fibers are guaranteed.

Description

technical field [0001] The invention relates to a dyeing technology, in particular to a dark dyeing and finishing technology of PLA fiber and tencel fiber blended fabric. Background technique [0002] Although PLA fiber is suitable for dyeing with disperse dyes, because the fiber composition and structure are different from PET fibers, the dyeing performance is very different. Generally speaking, it has low dyeing temperature, difficult to dye deep, poor fastness, and is more sensitive to alkali and temperature. Generally speaking, since there are no square groups such as benzene rings in the molecular chain of PLA fibers, there are only more ester groups, and the crystallinity is higher, so those molecules are relatively simple, especially linear, and there are more ester groups in the molecules. Dyes with polar groups such as ester groups, hydroxyl groups, halogen atoms, and amino groups have high affinity. These dyes are easier to diffuse into fibers, and then combine wit...

AI Technical Summary

Problems solved by technology

[0002] Although PLA fiber is suitable for dyeing with disperse dyes, because the fiber composition and structure are different from PET fibers, the dyeing performance is very different. Generally speaking, its dyeing temperature is low, it is difficult to dye deep, the fastness is poor, and it is more sensitive to alkali and temperature.

Generally speaking, since there are no square groups such as benzene rings in the molecular chain of PLA fibers, there are only more ester groups, and the crystallinity is higher, so those molecules are relatively simple, especially linear, and there are more ester groups in the molecules. Dyes with polar groups such as ester groups, hydroxyl groups, halogen atoms, and amino groups have high affinity. These dyes are easier to diffuse into fibers, and then combine with fiber molecules through dipole forces or hydrogen bonds. Although some molecules are relatively simple, but Dyes lacking the above-mentioned groups, or dyes with larger molecular volumes have poor binding ability, and the equilibrium adsorption capacity is also low. The saturated adsorption capacity of many dyes is only about 1 / 6 of that of PET fibers (100 degrees Celsius dyeing). It leads to dyeing improvement and low dyeing efficiency

[0003] On the other hand, PLA fiber is not resistant to strong alkali, and strong alkali will damage PLA fiber. If traditional reactive dyes are used to dye PLA fiber and Tencel fiber blended fabrics, dark dyeing and finishing cannot be carried out.

The conventional PLA fiber and Tencel fiber blended fabrics are dyed dark by two-bath method. Firstly, the PLA fiber is dyed with disperse dyes. Tencel fiber is dyed with reactive dyes. Soda ash must be added for reactive dyes to fix the color, and 15% must be added for dark colors. -25g / L soda ash is used as the dyeing and fixing alkali agent, and the pH value reaches above 11. Because the PLA fiber is not resistant to strong alkali and high temperature, it is used to dye PLA fiber and Tencel fiber blended fabrics with general reactive dyes. Tencel fibers cannot be dyed and finished in dark colors