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Preparation method of hydrophobic controllable reactive dye D-W-R

A D-W-R, reactive dye technology, applied in the field of preparation of hydrophobic controllable reactive dye D-W-R, can solve the problems of uneven distribution of positive charges on the surface of modified cellulose fibers, reducing the diffusion of reactive dyes, and reducing wet rubbing fastness, etc. Soaping difficulty, easy industrialization, and the effect of improving utilization

Inactive Publication Date: 2012-06-20
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the "bottleneck" problem encountered in the process of chemical modification of cellulose fibers or reactive dyes is: most of the modifiers used at present are cationic modifiers, the uneven distribution of positive charges on the surface of modified cellulose fibers and the electrostatic force driving activity The adsorption of dyes to cellulose fibers reduces the diffusion of reactive dyes inside the fibers, resulting in uneven dyeing; in addition, the wet rubbing fastness is reduced due to the ionic bond formed between reactive dyes and modifiers
Therefore, in order to increase the adsorption of reactive dyes on cellulose fibers, in addition to changing the surface charge of the fibers or dye molecules, it can also be achieved by changing the solubility of the dye in water, but so far, there is no relevant research report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 1.00 g (1.60 mmol) reactive brilliant red X-3B (C.I. reactive red 2) commercial dye in 30 mL distilled water, then add 0.309 g (1.60 mmol) 1-bromooctane and 1.182 g (3.20 mmol) phase Transfer catalyst tetrabutylammonium iodide, react at 100°C for 6 h, concentrate the product solution under reduced pressure, then add sodium chloride for salting out, separate by pressure filtration to obtain a dye filter cake, and then wash with cyclohexane to remove unreacted 1- Bromooctane, dry to obtain the hydrophobic and controllable reactive brilliant red X-3B with a substitution degree of 45%.

Embodiment 2

[0025] Dissolve 1.00 g (1.33 mmol) reactive orange K-R dye precursor into 50 mL N, N-dimethylformamide, then add 0.199 g (0.798 mmol) 1-bromododecane and 0.295 g (0.798 mmol) phase Transfer catalyst tetrabutylammonium iodide, reflux at 150°C for 4 h, evaporate the solvent under reduced pressure, wash with n-hexane to remove unreacted 1-bromododecane, dissolve the dye filter cake into a 20% aqueous solution, Then add sodium chloride for salting out, press filter to separate the dye cake, and dry it to obtain the reactive brilliant orange K-R with a degree of substitution of 20% hydrophobic controllable.

Embodiment 3

[0027] Dissolve 1.00 g (1.60 mmol) reactive brilliant blue KN-R (C.I. reactive blue 19) dye precursor into 40 mL dimethyl sulfoxide, then add 0.454 g (3.20 mmol) methyl iodide and 1.032 g (3.20 mmol) phase Transfer catalyst tetrabutylammonium bromide, reflux at 40 °C for 10 h, evaporate under reduced pressure to remove the solvent and unreacted methyl iodide, dissolve the dye filter cake into a 20% aqueous solution, then add sodium chloride for salting out, press The dye filter cake was separated by filtration, and dried to obtain the hydrophobic and controllable reactive brilliant blue KN-R with a substitution degree of 80%.

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Abstract

The invention relates to a preparation method of a hydrophobic controllable reactive dye D-W-R. D is a reactive dye parent body; W is an ester group generated through reactions of water-soluble groups in the reactive dye molecular structure, such as a sulfonic group, a sulfate group or a carboxylic group, with a halogenated hydrocarbon; R is a C1-C12 hydrophobic chain segment. The invention prepares a hydrophobic controllable reactive dye through esterification reactions of water-soluble groups in the reactive dye molecular structure, such as a sulfonic group, a sulfate group or a carboxylic group, with a halogenated hydrocarbon. The invention has a simple process, does not require special process equipment, has an easily controllable esterification rate, and has low cost. The hydrophobic controllable reactive dye obtained in the invention is especially suitable for low-salt or salt-free dyeing cellulose fibers, can increase the dye utilization rate, does not increase the soaping difficulty of dyed fabrics, does not change the color light of dyed products, and can reduce waste water treatment cost.

Description

technical field [0001] The invention belongs to the field of preparation of reactive dyes, in particular to a method for preparing hydrophobic controllable reactive dye D-W-R. Background technique [0002] When dyeing reactive dyes, because the dyeing rate is not high enough, a large amount of electrolyte is needed to promote the dyeing. According to the different structures of the dyes, the amount of salt used is generally 30-150 g / L. However, the use of electrolytes will result in the generation of waste water containing a large amount of dyes and electrolytes, which will seriously pollute the environment. [0003] For a long time, dyeing workers have devoted themselves to the chemical modification of cellulose fibers or reactive dyes to improve their dyeing properties and reduce the use of inorganic salts in the dyeing process. However, the "bottleneck" problem encountered in the process of chemical modification of cellulose fibers or reactive dyes is: most of the modifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/24C09B62/085C09B62/095C09B62/515D06P1/38D06P3/66
Inventor 薛旭婷卢明李云龙
Owner SOUTHWEST UNIV
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