A kind of preparation of modified sodium lignosulfonate

A technology of sodium lignosulfonate and modification, applied in dyeing method, textile and papermaking, organic dyes, etc., can solve the problems of incomplete research on the color-generating mechanism, restricting surfactants, etc., achieving a small molecular weight range, high resistance to Good thermal stability and less staining

Inactive Publication Date: 2017-07-21
江西世龙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These special molecular structures give lignosulfonate a special color, and its color-forming mechanism has not been fully studied so far, which restricts the work of modifying lignosulfonate to prepare surfactants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The sodium lignosulfonate raw material of the present invention all comes from the pulping waste liquor of the sulfite process, and the mass fraction of the sodium lignosulfonate is about 70%.

[0021] A kind of preparation method of the sodium lignosulfonate of dispersant for dyestuff, the steps are as follows:

[0022] (1) Select the raw material of sodium lignosulfonate: select sodium lignosulfonate with a molecular weight of 5000 as the raw material;

[0023] (2) Prepare 80g / L sodium lignosulfonate with acetic acid-sodium acetate buffer solution with a pH of 4-5, add 2 U / g sodium lignosulfonate laccase, 2 U / g sodium lignosulfonate After reacting the glucoamylase at 50°C for 6 hours, boil to inactivate the laccase and glucoamylase;

[0024] (3) Filtrating the prepared product, and freeze-drying the filtrate to obtain modified sodium lignosulfonate.

[0025] result:

[0026] The molecular weight distribution of the prepared sodium lignosulfonate is between 20,000 a...

Embodiment 2

[0030] A kind of preparation method of the sodium lignosulfonate of dispersant for dyestuff, the steps are as follows:

[0031] (1) Select the raw material of sodium lignosulfonate: select sodium lignosulfonate with a molecular weight of 9000 as the raw material;

[0032] (2) Prepare 95g / L sodium lignosulfonate with acetic acid-sodium acetate buffer solution with pH 4-5, add 2.8U / g sodium lignosulfonate laccase, 3 U / g sodium lignosulfonate After the glucoamylase was reacted at 56°C for 9 hours, the laccase and glucoamylase were inactivated by boiling;

[0033] (3) Filtrating the prepared product, and freeze-drying the filtrate to obtain modified sodium lignosulfonate.

[0034] result:

[0035] The molecular weight distribution of the prepared sodium lignosulfonate is between 22,000 and 25,000, the average molecular weight is 23,200, and the color is very light brown.

[0036] As a sodium lignosulfonate dye dispersant, keep it at 150°C for 10 minutes, its diffusion performan...

Embodiment 3

[0039] A kind of preparation method of the sodium lignosulfonate of dispersant for dyestuff, the steps are as follows:

[0040] (1) Select the raw material of sodium lignosulfonate: select sodium lignosulfonate with a molecular weight of 8000 as the raw material;

[0041] (2) Prepare 80 g / L sodium lignosulfonate with acetic acid-sodium acetate buffer solution with pH 5, add 2.5 U / g sodium lignosulfonate laccase, and saccharify 2.5 U / g sodium lignosulfonate After reacting the enzyme at 55°C for 6-9h, boil to inactivate laccase and glucoamylase;

[0042] (3) Filtrating the prepared product, and freeze-drying the filtrate to obtain modified sodium lignosulfonate.

[0043] result:

[0044] The molecular weight distribution of the prepared sodium lignosulfonate is between 20,000 and 24,000, the average molecular weight is 21,500, and the color is very light brown.

[0045] As a sodium lignosulfonate dye dispersant, keep it at 150°C for 10 minutes, its diffusion performance can r...

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Abstract

The invention discloses a preparation method for sodium lignosulfonate of a dyestuff dispersant. The preparation method comprises the following steps: selecting sodium lignosulfonate of which the molecular weight is 5000-9000 as a raw material; preparing 80-95 g / L of sodium lignosulfonate by utilizing an acetate and sodium acetate buffer solution with the pH value of 4-5, adding laccase of 2-2.8 U / g sodium lignosulfonate and maltogenic amylase of 2-3 U / g sodium lignosulfonate to react for 6-9 h at the temperature of 50-56 DEG C, boiling to inactivate laccase and maltogenic amylase; filtering the prepared product, and freeze-drying the filtrate to obtain modified sodium lignosulfonate. The prepared sodium lignosulfonate is light in color, little in staining, narrow in molecular weight range and resistant to high temperature of 150 DEG C or above.

Description

technical field [0001] The invention belongs to the technical field of polymer chemical industry, and in particular relates to the preparation of modified sodium lignosulfonate. Background technique [0002] Lignin is the second most abundant natural high polymer with aromatic structure in nature, and it is an extremely important renewable biological resource. The natural world can produce about 6×10 １４ t. The depletion of traditional ore resources and the enhancement of human awareness of environmental protection have brought a strong impetus to the basic research and industrial utilization of lignin. Lignosulfonate is a derivative of lignin. Its modification to prepare surfactants has developed vigorously in recent years and has made a series of important progress. The modified products are widely used in industrial and agricultural production. [0003] Lignin is a natural macromolecular compound with complex structure formed by random coupling of three phenylpropane str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00C09B67/38D06P1/46
Inventor 杨坤武
Owner 江西世龙新材料有限公司
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