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A color-fixing agent for reactive dyes and its preparation method

A technology of reactive dyes and color-fixing agents, which is applied in dyeing, textiles and papermaking, can solve the problems of harmful formaldehyde, easy to cause color change, and insufficient supply of raw materials, and achieve improved color fastness to rubbing and good soap resistance. Effects of color fastness to washing and good color fastness to rubbing

Active Publication Date: 2021-02-05
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional reactive polymer color fixing agent Y can effectively improve the color fastness of the fabric, it contains formaldehyde which is harmful to the human body.
At present, the types of formaldehyde-free color fixing agents commonly used in the market are polyamine polymers and cationic polymers. Polyamine polymer color fixing agents have a good effect on the color fixing of reactive dyes, but they are easy to cause color change; cationic Although the polymer color fixing agent has a good color fixing effect, the production of diallylamine, one of the raw materials for the synthesis of the color fixing agent, is restricted due to environmental protection regulations, resulting in a serious shortage of supply of this raw material

Method used

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  • A color-fixing agent for reactive dyes and its preparation method
  • A color-fixing agent for reactive dyes and its preparation method
  • A color-fixing agent for reactive dyes and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This embodiment provides a method for preparing a color-fixing agent for reactive dyes, and the synthesis reaction scheme is as follows:

[0035]

[0036] Among them, R means ;

[0037]

[0038] Among them, R means ; 1 express ; 2 express , 9≤m≤17;

[0039] " " express , 9≤m≤17;

[0040] DBTDL stands for dibutyltin dilaurate.

[0041] Specific steps are as follows:

[0042] (1) Add 6.1g of monoethanolamine into a reaction vessel equipped with a stirrer, dropping device and condensing reflux device, heat up to 20°C, add 22g of 1,4-butanediol diglycidyl ether dropwise in 0.5h After completion, continue the heat preservation reaction for 1 hour; then heat up to 50°C, add 22g of 1,4-butanediol diglycidyl ether dropwise in 0.5 hours, and continue heat preservation reaction for 3 hours to obtain a chain extender.

[0043] (2) Add 4.9g of isophorone diisocyanate and 6g of polypropylene glycol into a reaction vessel equipped with a stirrer, thermometer a...

Embodiment 2

[0046](1) Add 6.1g of monoethanolamine into a reaction vessel equipped with a stirrer, dripping device and condensing reflux device, heat up to 25°C, and drop 24.2g of 1,4-butanediol diglycidyl ether in 0.5h After the addition is complete, continue the heat preservation reaction for 1.5 hours; then heat up to 55°C, add 24.2g of 1,4-butanediol diglycidyl ether dropwise in 0.5 hours, and continue the heat preservation reaction for 3.5 hours to obtain a chain extender.

[0047] (2) Add 4.9g of isophorone diisocyanate and 8g of polypropylene glycol into a reaction vessel equipped with a stirrer, thermometer and condensation reflux device, add 5g of acetone as a solvent, 0.01g of dibutyltin dilaurate as a catalyst, and open Condensing device and agitator, after 8 minutes of nitrogen gas, heat up to 75°C, keep warm for 2.5h; add the mixed solution of 1.2g chain extender and 5g acetone obtained in step (1), keep warm for 1.5h; cool down to 45 ℃, add 0.6g methyl ethyl ketoxime and kee...

Embodiment 3

[0050] (1) Add 6.1g of monoethanolamine into a reaction vessel equipped with a stirrer, dripping device and condensing reflux device, heat up to 30°C, and drop 26.41,4-butanediol diglycidyl ether in 1 hour. , continue the heat preservation reaction for 2 hours; heat up to 60° C., add 26.4 g of 1,4-butanediol diglycidyl ether dropwise in 1 hour, and continue heat preservation reaction for 4 hours to obtain a chain extender.

[0051] (2) Add 4.9g of isophorone diisocyanate and 10g of polypropylene glycol into a reaction vessel with a stirrer, a thermometer and a condensation reflux device, then add 6g of acetone as a solvent and 0.015g of dibutyltin dilaurate as a catalyst, Turn on the condensing device and the agitator, pass nitrogen gas for 10 minutes, heat up to 80°C, and keep it warm for 3 hours; add the mixed solution of 1.4g chain extender and 6g of acetone obtained in step (1), keep warm for 2h; cool down to 50°C , add 0.73g of methyl ethyl ketone oxime and keep it warm f...

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Abstract

The invention discloses a color-fixing agent for reactive dyes and a preparation method thereof. Using monoethanolamine and 1,4-butanediol diglycidyl ether as raw materials to synthesize a chain extender, then the polyurethane obtained by reacting isophorone diisocyanate, polypropylene glycol and chain extender is capped with methyl ethyl ketone oxime, and then processed at high speed Shear emulsification yields a fixing agent for reactive dyes. The cations contained in the color-fixing agent molecules can combine with the anions of the dye molecules by Coulomb attraction, reducing the hydration ability of the dyes; Some active groups on the dye undergo cross-linking; the epoxy group contained in the color-fixing agent molecule undergoes a ring-opening reaction with the active groups on the fiber and the dye under certain conditions to form a cross-linking effect; at the same time, the color-fixing agent As a polyurethane agent, it has a strong film-forming ability, and the formed film can cover the dye, so that the dye can be firmly attached to the fabric to achieve the purpose of color fixation.

Description

technical field [0001] The invention relates to the technical field of synthesis of textile printing and dyeing auxiliaries, in particular to a color-fixing agent for reactive dyes and a preparation method thereof. [0002] technical background [0003] Reactive dyes have the advantages of bright color, complete color spectrum and low production cost, so they are widely used in the dyeing of various fabrics. Reactive dye molecules contain active groups that can react with hydroxyl groups in cellulose fibers and amino groups in protein fibers, and can form covalent bonds with fibers during dyeing, and can achieve good color fastness when dyeing light-colored fabrics, but When dyeing dark fabrics, the rubbing fastness of many varieties is poor; at the same time, due to the low utilization rate of dyes, a large amount of colored sewage generated during dyeing brings huge pressure on environmental protection. In order to solve the problem of poor color fastness to rubbing and so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/28C08G18/32C08G18/10C08G18/08D06P5/08D06P3/66D06P1/38
CPCC08G18/0814C08G18/10C08G18/286C08G18/4825C08G18/755D06P1/38D06P3/66D06P5/08C08G18/3281C08G18/2805
Inventor 周向东雷文文
Owner SUZHOU UNIV
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