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A kind of method for improving color fixation rate of reactive dyes in alcoholic organic solvent-water system

A technology of organic solvents and reactive dyes, applied in the field of textile printing and dyeing processing, can solve the problems of affecting dye diffusion, multiple processing steps, poor thermal stability, etc., and achieve the effects of shortening the process flow, lowering the dyeing temperature, and reducing the content of salt

Active Publication Date: 2022-02-08
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Triazine-type quaternary ammonium salt compounds are too reactive with cotton fibers, and the modifier reacts preferentially on the surface of the fibers, affecting the diffusion of subsequent dyes; azetidine cationic compounds need to be treated with high-temperature thermosetting processes, which will Causes a certain degree of damage to the fiber; N-methylolacrylamide will release formaldehyde during storage and use; Glytac reagent is simple to synthesize, relatively low in cost, and evenly modifies cotton fabrics, but the ring in the structure of Glytac reagent Oxygen groups are easy to hydrolyze and have poor thermal stability. Migration is easy to occur during high-temperature melting and drying treatment, so it is easy to cause uneven dyeing
Due to the relatively small molecular weight of the small-molecule cationization reagent auxiliary, the auxiliary molecules can enter the interior of the cotton fiber through diffusion, and the cotton fiber can be uniformly modified. Good penetrability, but the amount of such cationic reagents is relatively large, and there are many cationic modification steps, and the operation is cumbersome

Method used

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  • A kind of method for improving color fixation rate of reactive dyes in alcoholic organic solvent-water system
  • A kind of method for improving color fixation rate of reactive dyes in alcoholic organic solvent-water system
  • A kind of method for improving color fixation rate of reactive dyes in alcoholic organic solvent-water system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A method for improving the color fixation rate of reactive dyes in ethanol-water system, comprising the steps:

[0050] S1. Lye treatment of cotton textiles:

[0051] 2g of cotton yarn to be dyed is placed in 15g / L sodium carbonate solution, bath ratio is 1:20, 60 ℃ dipping treatment 10min; Wherein, the solvent of described sodium carbonate solution is the volume ratio is 5% ethanol and 95% water mixed solution;

[0052] S2. Cationic modification of cotton textiles:

[0053] Add 1g 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHTPAC) cationic modifier in the lye described in step S1, make 3-chloro-2-hydroxypropyltrimethylammonium chloride cationic The concentration of the modifier is 25g / L, and the treatment is continued at 60°C for 50 minutes, and the liquid carrying rate is finally controlled to 100%;

[0054] S3, dyeing:

[0055] The cotton textiles treated in step S2 are placed in reactive red 195 dyeing solution with a concentration of 1% o.w.f., the bat...

Embodiment 2-13

[0059] Embodiment 2-13 provides a kind of method for improving the fixation rate of reactive dyes in ethanol-water system, compared with embodiment 1, difference is that in step S2, change 3-chloro-2-hydroxypropyltrimethyl The concentration of ammonium chloride (CHTPAC) cationic modifier, except the above-mentioned difference, other operations are all the same, no longer repeat them here; 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHTPAC) cationic The specific amount of agent used, the dye uptake rate of cotton yarn, the K / S value before and after soaping, and the test results of color fixation rate are shown in the table below.

[0060]

[0061]

[0062] From the results in the above table, it can be seen that with the increase of the concentration of 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHTPAC) cationic modifier, the dye uptake rate of modified cotton yarn without salt dyeing, the dyeing rate before and after soaping The K / S value and color fixa...

Embodiment 14-17

[0065] Embodiments 14-17 provide a method for improving the fixation rate of reactive dyes in an ethanol-water system. Compared with Example 1, the difference is that the modification treatment temperature in step S2 is changed. In addition to the above differences, other operations They are all the same, so I won’t go into details here; the specific modification temperature conditions, the dye uptake rate of cotton yarn, the K / S value before and after soaping, and the test results of color fixation rate are shown in the table below.

[0066]

[0067] Comparing the results of Example 1 and Examples 14-17, it can be seen that as the modification treatment temperature increases from 30°C to 60°C, the dye uptake rate of modified cotton yarn without salt dyeing, the K / S value before and after soaping, and the color fixation The rate increases gradually, which may be due to the fact that within a certain temperature range, the increase in temperature is conducive to the grafting ...

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Abstract

The invention discloses a method for improving the color fixation rate of reactive dyes in an alcoholic organic solvent-water system, which is to modify pre-dyed cotton textiles and then directly Dyeing in an alcohol organic solvent-water system, the affinity between cotton textiles and reactive dyes is significantly improved through the synergistic effect of alkali solution pre-swelling and cationic modifier modification, so that cotton textiles can be dyed without salt. The color rate and the K / S value after soaping are improved; at the same time, the present invention adopts placing cotton textiles in an alcoholic organic solvent-water system to carry out lye pre-swelling and then carry out cationic modification. On the other hand, it is used as a color-fixing agent for the dyeing of modified cotton textiles, and the modified cotton textiles are directly dyed without washing, which significantly improves the ability of reactive dyes in alcohol organic solvent-water Fixation rate in the system.

Description

technical field [0001] The invention relates to the field of textile printing and dyeing processing, in particular to a method for improving the fixation rate of reactive dyes in an alcohol organic solvent-water system. Background technique [0002] Reactive dyes are named because the dye molecules contain reactive groups that react with fibers, and can also be called reactive dyes. Due to its bright color, complete chromatogram, simple application process, excellent fastness, and the ability to form covalent bonds with many fibers, reactive dyes have become the most important type of dyes for cellulose fiber and fabric dyeing. However, the dyeing fixation rate of reactive dyes is low, and the utilization rate of dyes is not high, especially when dyeing dark colors (the dye concentration is greater than 3% o.w.f.), the dye fixation rate is generally about 50-80%, so there will be 20- 50% of reactive dyes are wasted without reacting with fibers, which not only causes waste o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P1/66D06P1/38D06P3/66D06P5/22
CPCD06P1/66D06P1/38D06P3/66D06P5/225
Inventor 夏良君王阿明付专周思婕毛云山王运利徐卫林
Owner WUHAN TEXTILE UNIV
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