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Low-pollution lignin dispersant for disperse dye as well as preparation method and application thereof

A disperse dye and staining technology, which is applied in the field of biomass resource utilization, can solve problems such as fiber staining, achieve the effects of improving adsorption performance, improving dispersion stability, and increasing adsorption strength

Active Publication Date: 2015-02-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to develop a kind of dispersing agent that greatly reduces the fiber staining rate and has excellent dispersion stability in view of the serious problem of existing lignin-based dispersants on fiber staining and the defects of existing modification technologies. Lignin-based dispersant for dyestuffs

Method used

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  • Low-pollution lignin dispersant for disperse dye as well as preparation method and application thereof
  • Low-pollution lignin dispersant for disperse dye as well as preparation method and application thereof
  • Low-pollution lignin dispersant for disperse dye as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 100g of wood pulp alkali lignin solid and dissolve it in water, adjust the pH to 9.0 with a mass concentration of 20% sodium hydroxide aqueous solution, prepare a wood pulp alkali lignin aqueous solution with a mass concentration of 20%, heat to 60°C, add 5g of hydroxy Sodium ethylsulfonate was reacted for 1h to obtain an isethionated alkali lignin solution;

[0036] Adjust the pH of the isethionated alkali lignin solution to 4.0 with an aqueous sulfuric acid solution with a mass concentration of 10%, add 2g of hydroxyethylurea and 1g of n-octanol, and stir at 40°C for 60min to obtain a low-sticking agent for disperse dyes. Sludge lignin-based dispersant liquid product.

Embodiment 2

[0038] Get 100g of bamboo pulp alkali lignin solid and dissolve it in water, adjust the pH to 12.0 with a mass concentration of 30% potassium hydroxide aqueous solution, prepare a bamboo pulp alkali lignin aqueous solution with a mass concentration of 50%, heat to 90°C, add 30g of hydroxy Sodium ethylsulfonate was reacted for 3 hours to obtain an isethionated alkali lignin solution;

[0039] Adjust the pH of the isethionated alkali lignin solution to 6.0 with 20% aqueous sulfuric acid, add 10 g of guanidine hydrochloride and 5 g of dodecanol, and stir at 80° C. for 90 min to obtain a lignin-based dispersant liquid product.

Embodiment 3

[0041] Take 30g of bagasse alkali lignin and 70g of wood pulp alkali lignin solid and dissolve them in water, adjust the pH to 10.0 with a 25% aqueous solution of sodium hydroxide, prepare an aqueous solution with a mass concentration of 25%, heat to 80°C, and add 20g Sodium isethionate, reacted for 2 hours to obtain isethionated alkali lignin solution;

[0042] Use 15% sulfuric acid aqueous solution to adjust the pH of isethionated alkali lignin solution to 5.0, add 2.5g hydroxyethylurea and 5g semicarbazide, 1g dodecanol and 2g n-nonanol, stir at 70°C for 75min, thus obtain Lignin-based dispersant liquid product.

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Abstract

The invention discloses a low-pollution lignin dispersant for a disperse dye as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, dissolving an alkali lignin solid in water, adjusting the pH value to be 9.0-12.0 for preparing an alkali lignin aqueous solution with the mass concentration of 20%-50%, heating to 60-90 DEG C, and adding sodium hydroxyethyl sulfonate for reacting for 1-3 hours to obtain a sulfonated hydroxyethyl alkali lignin solution; adding a polarizing agent and a surface active material into the obtained sulfonated hydroxyethyl alkali lignin solution, uniformly stirring and adjusting the pH value to be 4.0-6.0 to obtain the low-pollution lignin dispersant. Compared with sodium lignin sulfonate and sulfomethylated lignin dispersants, the low-pollution lignin dispersant has the characteristics that the pollution rate of fibers and the reduction rate of the disperse dye are remarkably reduced, a dye system prepared from the dye dispersant has the characteristics that the dye-uptake rate of the fibers is greatly increased in comparison with sodium lignin sulfonate, and the dispersion stability of a prepared dye dispersion solution is superior to that of a naphthaline dispersant.

Description

technical field [0001] The invention relates to a dispersant for disperse dyes, in particular to a low-contamination lignin-based dispersant for disperse dyes, a preparation method and application thereof, and belongs to the technical field of biomass resource utilization. Background technique [0002] As one of the main dyes of synthetic fibers, disperse dyes have a wide range of uses and huge demands in the printing and dyeing industry. However, disperse dyes are water-insoluble dyes. During the grinding process and dyeing process, a large amount of dispersant needs to be added to make the dyes disperse stably and evenly, so as to improve their dispersing and dyeing performance. Therefore, dye dispersants play a vital role in the processing and use of commercial dyes. [0003] At present, the dispersants for ball milling of disperse dyes mainly include naphthalenesulfonic acid formaldehyde condensate and lignosulfonate. Naphthalenesulfonic acid formaldehyde condensate dy...

Claims

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Application Information

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IPC IPC(8): C09B67/38C08H7/00
Inventor 邱学青杨东杰李会景黄锦浩楼宏铭邓永红欧阳新平
Owner SOUTH CHINA UNIV OF TECH
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