A kind of lignin polyoxypropylene ether sulfate and its preparation method and application as dispersant

A polyoxypropylene ether and lignin technology, applied in the preparation, application, dyeing and other directions of sulfonate, can solve the problem of poor application performance, inability to provide, and multiple hydrophobic adsorption sites of end-group sulfonate-type lignin polyether and other problems, to achieve the effect of high adsorption fastness, small damage and easy process

Active Publication Date: 2022-03-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since alkenyl polyethylene glycol belongs to flexible hydrophilic long chain, although it can react with alkali lignin in alkaline aqueous solution, it cannot provide more hydrophobic adsorption sites in the application of hydrophobic suspension system, so this The application performance of the terminal sulfonate type lignin polyether prepared by patent is poor

Method used

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  • A kind of lignin polyoxypropylene ether sulfate and its preparation method and application as dispersant
  • A kind of lignin polyoxypropylene ether sulfate and its preparation method and application as dispersant
  • A kind of lignin polyoxypropylene ether sulfate and its preparation method and application as dispersant

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A preparation method of lignin polyoxypropylene ether sulfate, comprising the following steps:

[0042] 100g of alkali lignin was dissolved in alkaline aqueous solution (pH value 11) to obtain a lignin solution with a concentration of 20%; 50g of polypropylene glycol glycidyl ether (molecular weight=600) was dissolved in 100g of acetone to obtain a homogeneous solution. Mix the above-mentioned lignin solution and polypropylene glycol glycidyl ether solution together, add 10 g of sodium p-toluenesulfonate, stir and mix to form a homogeneous semi-water-based system. Then, hydrochloric acid aqueous solution was added to adjust the pH of the reaction solution to 4, and the reaction was incubated at 90° C. for 1 hour; 50 g of sodium sulfite was then added, and the reaction was incubated at 90° C. for 2 hours. The pH of the product is adjusted to 6 by adding aqueous sodium hydroxide solution, and the solvent is distilled off to obtain the lignin polyoxypropylene ether sulfate...

Embodiment 2

[0049] A preparation method of lignin polyoxypropylene ether sulfate, comprising the following steps:

[0050] Dissolve 90g of enzymatic lignin in alkaline aqueous solution (pH value 12) to obtain a lignin solution with a concentration of 25%; dissolve 20g of polypropylene glycol glycidyl ether (molecular weight=400) in 90g of butanone to obtain a homogeneous solution. Mix the above-mentioned lignin solution and polypropylene glycol glycidyl ether solution together, add 9g of potassium p-toluenesulfonate, stir and mix to form a homogeneous semi-water-based system. Then add sulfuric acid aqueous solution to adjust the pH of the reaction solution to 3, keep the reaction at 85° C. for 2 hours; then add 45 g of potassium sulfite, and keep the reaction at 80° C. for 3 hours. Add sodium hydroxide aqueous solution to adjust the pH of the product to 7, and distill off the solvent to obtain the lignin polyoxypropylene ether sulfate product.

[0051] Compared with Example 1, the produ...

Embodiment 3

[0053] A preparation method of lignin polyoxypropylene ether sulfate, comprising the following steps:

[0054] 80g high-boiling alcohol lignin is dissolved in alkaline aqueous solution (pH value 13) to obtain a lignin solution with a concentration of 30%; 35g polypropylene glycol glycidyl ether (molecular weight=200) is dissolved in 80g cyclohexanone to obtain homogeneous solution. Mix the above-mentioned lignin solution and polypropylene glycol glycidyl ether solution together, add 8 g of urea, stir and mix to form a homogeneous semi-water-based system. Then add p-toluenesulfonic acid aqueous solution to adjust the pH of the reaction solution to 5, and keep the reaction at 80°C for 3 hours; then add 10g of sodium bisulfite, and keep the reaction at 85°C for 4 hours. The pH of the product is adjusted to 8 by adding an aqueous sodium hydroxide solution, and the solvent is distilled off to obtain a lignin polyoxypropylene ether sulfate product.

[0055] Compared with Example 1...

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Abstract

The invention discloses a lignin polyoxypropylene ether sulfate and its preparation method and application as a dispersant. The preparation method comprises the following steps: mixing lignin solution and polypropylene glycol glycidyl ether solution, adding 1 to 10 parts Phase transfer agent, stirring and mixing to form a homogeneous semi-water-based system; then adjust the pH value of the reaction solution to 2-7, and keep it at 50-90°C for 1-5 hours; then add 10-50 parts of sulfonating agent, ~90°C heat preservation reaction for 1~5 hours; finally adjust the pH value of the reaction product to 6~8, and then distill off the solvent to obtain the lignin polyoxypropylene ether sulfate product. The lignin polyoxypropylene ether sulfate of the present invention contains a lignin-based aromatic ring-polyoxypropylene ether chain composite hydrophobic functional group, which can form a multi-point anchoring adsorption as a hydrophobic base, and contains more anchoring adsorption groups in its molecule, which can Occupy more adsorption sites and form greater steric hindrance on the surface of hydrophobic particles.

Description

technical field [0001] The invention relates to modified lignin, in particular to a lignin polyoxypropylene ether sulfate and its preparation method in a semi-water-based system, and its application as a dispersant in nano-disperse dyes and pesticide aqueous suspensions. Background technique [0002] Both nano-disperse dyes and pesticide aqueous suspensions are green water-based dispersion systems, which are respectively a nano-dispersion system (≤200nm) and a micro-dispersion system (≤5μm). They are both thermodynamically unstable systems, and the particle sizes in the system are all easy. Agglomeration occurs and grows up, and the storage stability is poor. [0003] Lignin dispersant is a kind of green and environment-friendly dispersant, which has been used in both fields, but because the particle size of these two systems is relatively small, the collision strength between particles is strong, and the stability is poor, which has a great impact on dispersion. The adsorp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C07C309/10C07C303/32C09B67/46A01N25/04D06P1/62D06P1/16
CPCC08G81/00C07C309/10C09B67/009C09B67/0086A01N25/04D06P1/627D06P1/16
Inventor 周明松陈晴杨东杰邱学青楼宏铭钱勇庞煜霞
Owner SOUTH CHINA UNIV OF TECH
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