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Method for carrying out salt-free dyeing on un-scoured and unbleached cotton textile by reactive dyes

A technology of cotton textiles and reactive dyes, applied in the field of textile printing and dyeing, which can solve the problems of complex process, poor water absorption of cotton textiles, and inability to pre-swell cotton textiles, etc., and achieve the effect of simple dyeing process, increased dyeing rate and low cost

Active Publication Date: 2013-12-25
WUHAN TEXTILE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it uses organic solvents to dye textiles, it does have environmental protection effects such as no salt, but its disadvantage is that the textiles need to be pre-treated before dyeing.
Although it adopts the method of pre-swelling the textiles to be dyed with water, then dyeing in pure water dyeing solution, and finally adding organic solvents, it can indeed achieve a certain salt-free dyeing effect, but its disadvantages are Not only the process is more complicated, but also due to the poor water absorption of uncooked and bleached cotton textiles, it is impossible to pre-swell uncooked and bleached cotton textiles with water
Although the method it adopts can achieve a certain leveling effect, its disadvantage is that the method needs to add organic solvents in batches, and the process is relatively complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] According to the above process steps: select 5g of unboiled and bleached cotton yarn as the textile to be dyed, place the penetrating agent and the leveling agent in the mixed solution of ethanol and water, mix it into a pre-swelling liquid after stirring evenly, wherein, the bath of the pre-swelling liquid The ratio is 1:30, the volume ratio of ethanol to water in the pre-swelling solution is 50%:50%, the concentration of penetrating agent is 6g / L, and the concentration of leveling agent is 6g / L. The unboiled and bleached cotton yarn to be dyed is placed in the pre-swelling liquid for soaking in the pre-swelling liquid, and the liquid-carrying rate of the unboiled and bleached cotton textile is 100% after the pre-swelling treatment. Put a chloro-s-triazine type reactive dye in a mixture of ethanol and water, stir evenly to prepare a dye solution, wherein the bath ratio of the dye solution is 1:30, and the volume ratio of ethanol to water in the dye solution is 95% : 5%...

Embodiment 2

[0049] According to the above process steps: select 5g of unboiled and bleached cotton fabric as the textile to be dyed, place the penetrating agent and the leveling agent in the mixed solution of isopropanol and water, mix it into a pre-swelling solution after stirring evenly, wherein the pre-swelling solution The bath ratio is 1:5, the volume ratio of isopropanol to water in the pre-swelling solution is 95%:5%, the concentration of penetrating agent is 3g / L, and the concentration of leveling agent is 3g / L. The boiled and bleached cotton fabric is put in the pre-swelling liquid and carried out two dipping and two rolling pre-swelling liquid treatments. After the pre-swelling treatment, the liquid-carrying rate of the unboiled and bleached cotton fabric is 50%. The dichloro-s-triazine type reactive dye is placed in isopropanol and In the mixed solution of water, stir evenly to prepare a dye solution, wherein the bath ratio of the dye solution is 1:5, the volume ratio of the alc...

Embodiment 3

[0054] According to the above process steps: select 5g of unboiled and bleached cotton sliver as the textile to be dyed, mix ethanol with water, stir to prepare a pre-swelling liquid, wherein, the bath ratio of the pre-swelling liquid is 1:20, ethanol in the pre-swelling liquid The volume ratio of water to water is 90%:10%; the unboiled and bleached cotton sliver to be dyed is placed in the pre-swelling liquid for two dipping and two-rolling pre-swelling liquid treatment, and the liquid carrying rate of the unboiled and bleached cotton sliver after the pre-swelling treatment 80%; put vinylsulfone type reactive dye in the mixture of ethanol and water, stir evenly to prepare dye solution, wherein, the bath ratio of dye solution is 1:20, and the volume ratio of ethanol and water in the dye solution is 90% %: 10%; the unboiled and bleached cotton sliver after pre-swelling treatment is placed in the dyeing solution for dyeing, wherein the dyeing temperature is 40°C, and the dyeing t...

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Abstract

The invention relates to a method for carrying out salt-free dyeing on an un-scoured and unbleached cotton textile by reactive dyes and belongs to the technical field of textile printing, dyeing and finishing. According to the method, the un-scoured and unbleached cotton textile is pre-swelled in a pre-swelling liquid which is formed by mixing a high-proportion alcohol-type organic solvent and a small amount of water, and the pre-swelled cotton textile is dyed by a dyeing liquid which is formed by mixing a high-proportion alcohol-type organic solvent, water and dyes, the wettability and the dyeability of the un-scoured and unbleached cotton textile can be effectively enhanced, and the pre-treating work processes of scouring and bleaching the cotton textile are reduced. The method can effectively enhance the dye-uptake rate, the color fixation rate, the dyeing effect and the color fastness of the reactive dyes onto the un-scoured and unbleached cotton textile, can completely meet production requirements, does not need salt, and is simple in technology, high in feasibility and easy for industrialization; the use amount of water is reduced greatly; besides, the alcohol-type organic solvents can be recycled, so that the method is little in pollution, low in cost, clean, energy-saving, safe and environment-friendly.

Description

technical field [0001] The invention relates to a salt-free dyeing method for unboiled and bleached cotton textiles with reactive dyes, belonging to the technical field of textile printing and dyeing. Background technique [0002] The material of cotton textiles is composed of cotton fibers. The cotton fibers in these undyed gray cloths contain natural impurities such as pectin and wax. These natural impurities mainly exist in the cuticle and primary cell wall of cotton fibers. Plus the oil and dirt on the fiber. The presence of these impurities not only makes cotton textiles yellow in color, rough in feel, but also poor in water absorption. For this reason, cotton textiles need to be scoured and bleached before dyeing. [0003] However, the traditional scouring and bleaching of cotton textiles is a wet treatment process, which requires heating and the use of chemical additives. Not only is the process lengthy, but it also consumes a lot of water and energy, which produces...

Claims

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Application Information

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IPC IPC(8): D06P1/38D06P1/90D06P1/44D06P3/66D06P5/10
Inventor 徐卫林夏良君
Owner WUHAN TEXTILE UNIV
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