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Method for preparing sodium lignosulfonate and application of sodium lignosulfonate as a dye dispersant

A technology of sodium lignosulfonate and lignin, which is applied in the field of preparing sodium lignosulfonate and sodium lignosulfonate as a dye dispersant, which can solve the problems of low heat resistance stability and heavy staining

Inactive Publication Date: 2014-07-09
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of lignosulfonate dye dispersant itself has high chroma, which has a great influence on the dyeing effect, and the staining is heavy; and its heat resistance stability is also low

Method used

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  • Method for preparing sodium lignosulfonate and application of sodium lignosulfonate as a dye dispersant
  • Method for preparing sodium lignosulfonate and application of sodium lignosulfonate as a dye dispersant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] First add 1000kg of water to a 5 cubic meter reactor, start stirring, add 600kg of lignin to it dry, and then add an appropriate amount of water to make a suspension with a mass concentration of 20%;

[0062] While stirring, add such as NaOH solution to adjust the pH value of the suspension to 7.5, then add 1.3mmol / g lignin sodium sulfite and 1.3mmol / g lignin formaldehyde to it in turn; turn on the steam and heat up to 120°C and keep it warm for 3h . After the reaction is completed, the temperature is lowered to 50°C for two plate and frame filtrations;

[0063] 0.7 mmol / g lignin blocking agent epichlorohydrin was added to the obtained filtrate, and the reaction was continued at 90° C. for 1 h. After the reaction is completed, concentrate to a solid content of 30% to obtain sodium lignosulfonate.

[0064] The sodium lignosulfonate obtained by the present invention is used as a dye dispersant, and the obtained sodium lignosulfonate is subjected to a performance test, a...

Embodiment 2

[0085] First add 1000kg of water to a 5 cubic meter reactor, start stirring, and add 600kg of lignin to dry it, and then add an appropriate amount of water to make a suspension with a mass concentration of 20%;

[0086] Add NaOH solution to it while stirring to adjust the pH value of the suspension to 8.5, then add 1.4mmol / g lignin sodium sulfite and 1.4mmol / g lignin formaldehyde to it in turn; turn on the steam and raise the temperature to 120°C and keep it warm for 3h. After the reaction is completed, the temperature is lowered to 50°C for two plate and frame filtrations;

[0087] Add 0.7 mmol / g lignin blocking agent epichlorohydrin to the desired filtrate, and continue to react at 90° C. for 1 h. After the reaction is completed, concentrate to a solid content of 35% to obtain sodium lignosulfonate.

[0088] The performance when the sodium lignosulfonate obtained according to the method test described in Example 1 is used as a dye dispersant, the results show that when the ...

Embodiment 3

[0090] First add 1000kg of water to a 5 cubic meter reactor, start stirring, add 600kg of lignin to it dry, and then add an appropriate amount of water to form a suspension with a mass concentration of 15%;

[0091] Add NaOH solution to it while stirring to adjust the pH value of the suspension to 7.5, then add 1.3mmol / g lignin sodium sulfite and 1.3mmol / g lignin formaldehyde to it in turn; turn on the steam and raise the temperature to 120°C and keep it warm for 3h. After the reaction is completed, the temperature is lowered to 50°C for two plate and frame filtrations;

[0092] Add 0.7 mmol / g lignin blocking agent ethylene oxide to the obtained filtrate and continue to react at 80° C. for 1 h. After the reaction is completed, concentrate to a solid content of 25% to obtain sodium lignosulfonate.

[0093] The performance when the sodium lignosulfonate obtained according to the method test described in Example 1 is used as a dye dispersant, the results show that when the sodium...

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Abstract

The invention provides a method for preparing sodium lignosulfonate. The method comprises the following steps: (A) providing a lignin suspension; (B) regulating the pH value of the suspension to 4.8-8.5; (C) sequentially adding sodium sulfite and formaldehyde to the suspension with pH value of 4.8-8.5, reacting and filtering to obtain filtrate; (D) mixing the filtrate with a sealant and reacting to obtain sodium lignosulfonate. The method provided by the invention has the advantages that the reaction between lignin and sodium sulfite and formaldehyde is controlled by controlling the adding order of sodium sulfite and formaldehyde; the filtrate obtained through filtering after reaction is reacted with the sealant to react with the free phenol hydroxyl, so that obtained sodium lignosulfonate has good dispersion property, excellent performance when used as the dye dispersant and little textile staining while having high heat stability.

Description

technical field [0001] The invention relates to the technical field of dyes, in particular to a method for preparing sodium lignosulfonate and the application of sodium lignosulfonate as a dye dispersant. Background technique [0002] Dye is a substance that can color fibers and other materials. It should have the characteristics of not easy to decolorize and change color, high dyeing rate, and uniform dyeing. In order to disperse the dye evenly, it is often necessary to add an auxiliary agent to it—dye dispersant, which is an auxiliary agent that can improve and improve the dispersion performance of solid or liquid materials, and can increase the solubility of dyes to improve printing and dyeing effects. . It is a category of processing aids with a large amount and a wide range and a rapid development. It has both lipophilic and hydrophilic groups, so commonly used dispersants are surfactants. [0003] Naphthalene-based sulfonic acid formaldehyde condensates, phenol, for...

Claims

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Application Information

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IPC IPC(8): C08H7/00C09B67/38D06P1/46
Inventor 唐一林江成真宁辉高绍丰
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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