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Carboxylated alkali lignin sulphonate dye dispersant and preparation method thereof

A technology of lignosulfonate and dye dispersant, applied in dyeing, organic dyes, textiles and papermaking, etc., can solve the problems of fiber contamination, reduction of azo dyes, low fiber contamination, etc. Repulsive force, improved dispersion stability, and excellent dispersion performance

Active Publication Date: 2014-11-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the current problems of poor high-temperature stability of lignin-based dye dispersants, serious fiber staining and serious reduction of azo dyes, the present invention develops a dispersant with excellent dispersibility, excellent high-temperature stability, low reducibility to azo dyes, and low reducibility to fibers. Carboxylated alkali lignosulfonate dye dispersant with low staining property and high content of sulfonic acid group and carboxyl group and preparation method thereof

Method used

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  • Carboxylated alkali lignin sulphonate dye dispersant and preparation method thereof
  • Carboxylated alkali lignin sulphonate dye dispersant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) 100 grams of bamboo alkali lignin (in terms of weight percentage, solid content is 95%) is mixed with alkaline aqueous solution and prepared into a solution with a mass fraction of 25%, and the pH of the solution is adjusted to 10, and then added to the autoclave Add 20 grams of sodium sulfite and 2 grams of formaldehyde, heat up to 140°C, and react for 4 hours to obtain an alkali lignosulfonate solution product;

[0030] (2) Transfer the alkali lignosulfonate solution prepared by the reaction in step (1) to an atmospheric pressure reactor, adjust its pH to 10.5, then raise the temperature to 60° C., slowly add 35 grams of dichloroacetic acid dropwise, in 40 minutes After completion of internal dropwise addition, react at 60°C for 1.5h to obtain carboxylated alkali lignosulfonate solution product, and then spray dry to obtain powdery carboxylated alkali lignosulfonate;

Embodiment 2

[0032] (1) 100 grams of oak alkali lignin (in terms of weight percent, solid content of 95%) is mixed with alkaline aqueous solution to prepare a solution with a mass fraction of 20%, and the pH of the solution is adjusted to 11, and then added to the high pressure reaction In the still, add 30 grams of sodium bisulfite, 2 grams of glutaraldehyde and 4 grams of acrolein, heat up to 120 ° C, and react for 2 hours to obtain the alkali lignosulfonate solution product;

[0033] (2) Transfer the alkali lignosulfonate solution prepared by the reaction in step (1) to an atmospheric pressure reactor, adjust its pH to 12, then heat up to 70°C, slowly add 30 grams of monobromoacetic acid dropwise, in 30min After the internal dropwise addition is completed, react at 70°C for 1 hour to obtain a carboxylated alkali lignosulfonate solution product, and then spray dry to obtain a powdery carboxylated alkali lignosulfonate.

Embodiment 3

[0035] (1) 100 grams of eucalyptus lignin (in terms of weight percentage, solid content is 95%) is mixed with alkaline aqueous solution to prepare a solution with a mass fraction of 30%, and the pH of the solution is adjusted to 12, and then added to the high pressure reaction In the still, add 15 grams of sodium sulfite, 15 grams of sodium bisulfite, 5 grams of formaldehyde and 5 grams of acetaldehyde, heat up to 160 ° C, and react for 4 hours to obtain the alkali lignosulfonate solution product;

[0036] (2) Transfer the alkali lignosulfonate solution prepared by the reaction in step (1) to an atmospheric pressure reactor, adjust its pH to 12, then raise the temperature to 80°C, slowly add 10 grams of monochloroacetic acid and 10 grams of Add iodoacetic acid dropwise within 40 minutes, then react at 80°C for 1 hour to obtain carboxylated alkali lignosulfonate solution product, and then spray dry to obtain powdery carboxylated alkali lignosulfonate.

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Abstract

The invention discloses a carboxylated alkali lignin sulphonate dye dispersant and a preparation method. The reaction raw materials comprises the following formula by mass fraction: 100 parts of alkali lignin, 20-60 parts of sulfonating agent, 2-20 parts of aldehydes compound and 20-45 parts of carboxylic acid compound. The alkali lignin is prepared by acidification of bamboo, Chinese oak, poplar, Eucalyptus, birch, a papermaking black liquor by a masson pine alkali method, the mass percentage is 95%. The preparation method comprises the following steps: preparing alkali lignin to a solution with mass fraction of 20-40%, then adding the sulfonating agent and the aldehydes compound for sulfomethylation reaction to prepare alkali lignin sulphonate, and the alkali lignin sulphonate is subjected to a carboxylation reaction with the carboxylic acid compound to prepare the carboxylated alkali lignin sulphonate. The prepared carboxylated alkali lignin sulphonate contains sulfonic group and carboxyl group, can be used as the dye dispersant, and has good dispersibility to the disperse dyes. Phenolic hydroxyl group with reductibility is subjected to the reaction in a modification reaction, so that reduction to an azo dye and contamination to the dispersant can be greatly reduced.

Description

technical field [0001] The invention relates to a dye dispersant, in particular to a carboxylated alkali lignosulfonate dye dispersant and a preparation method thereof. Background technique [0002] With the development of modern dyeing process, more and more disperse dyes are used, and in the process of using disperse dyes, dye dispersants must be used to disperse in aqueous solution more finely, more uniformly and more stably, even in the It is also not easy to aggregate when dyeing at high temperature, so the dye dispersant plays a pivotal role in the processing and dyeing process of disperse dyes. [0003] At present, dye dispersants mainly include naphthalenesulfonic acid formaldehyde condensate and lignosulfonate. Naphthalenesulfonic acid formaldehyde condensate dye dispersant has the advantages of light staining on fibers and less damage to azo dye reduction, but its high temperature resistance is poor, and it comes from the petroleum industry, and its raw materials ...

Claims

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Application Information

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IPC IPC(8): C08H7/00C09B67/38D06P1/46
Inventor 邱学青周明松张志鸣杨东杰
Owner SOUTH CHINA UNIV OF TECH
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