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Lignin based polyoxyethylene ether, preparation method and application thereof

A technology of cellulose-based polyoxyethylene ether and alkali lignin, which is applied in the field of pesticide suspending agent dispersant and lignin-based polyoxyethylene ether, can solve the problem of poor dispersion performance of products and poor ability to inhibit the growth of original drug particle crystals and other problems, to achieve the effect of excellent dispersion and viscosity reduction performance, rich variety and application range, and easy operation and control

Active Publication Date: 2014-04-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, lignosulfonate is mainly derived from lignosulfonate in acid pulping and papermaking waste liquid and sulfonated derivatives of alkali lignin in alkaline pulping and papermaking waste liquid. It has the advantage of cheap price, but the products are scattered The performance is poor, and the ability to inhibit the crystal growth of the original drug particles is poor, so the current application of lignosulfonate as a pesticide suspending agent is seldom

Method used

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  • Lignin based polyoxyethylene ether, preparation method and application thereof
  • Lignin based polyoxyethylene ether, preparation method and application thereof
  • Lignin based polyoxyethylene ether, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0037] A preparation method of lignin-based polyoxyethylene ether, comprising the following steps:

[0038] (1) Heat 200 grams of polyethylene glycol 400 to 40°C to melt, add 1 gram of antimony pentafluoride catalyst, stir and mix well, slowly add 10 grams of epichlorohydrin, dropwise within 30 minutes, drop After completion, react at 50°C for 1 hour to obtain a modified polyethylene glycol 400 intermediate;

[0039] (2) Mix 100 grams of alkali-processed wood pulp black liquor acid-analyzed alkali lignin (in terms of weight percentage, solid content is 95%) with water to prepare a suspension with a mass percentage concentration of 30%, and add sodium hydroxide to adjust When the pH reaches 10.5, slowly add the modified polyethylene glycol 400 intermediate prepared in step (1) dropwise at 70°C, and the dropwise addition is completed within 1.5h. After the dropwise addition, react at 80°C for 2h, and adjust after the reaction pH to 7.0, cooled to room temperature to obtain a li...

Embodiment 2

[0041] A preparation method of lignin-based polyoxyethylene ether, comprising the following steps:

[0042] (1) Heat 100 grams of polyethylene glycol 2000 to 60°C to melt, add 3 grams of antimony pentachloride catalyst, stir and mix evenly, slowly add 15 grams of epichlorohydrin, dropwise within 60 minutes, drop After completion, react at 40°C for 2 hours to obtain a modified polyethylene glycol 2000 intermediate;

[0043] (2) Mix 100 grams of alkaline pulping bamboo pulp black liquor acid analysis alkali lignin (in terms of weight percentage, solid content is 95%) with water to prepare a suspension with a mass percentage concentration of 40%, and add sodium hydroxide to adjust When the pH reaches 10, slowly add the modified polyethylene glycol 2000 intermediate prepared in step (1) dropwise at 60°C, and the dropwise addition is completed within 1 hour. After the dropwise addition, react at 70°C for 4 hours, and adjust the pH after the reaction to 6.0, cooled to room temperat...

Embodiment 3

[0045] A preparation method of lignin-based polyoxyethylene ether, comprising the following steps:

[0046] (1) Heat 300 grams of polyethylene glycol 1000 to 50°C to melt, add 2 grams of boron trifluoride ether complex catalyst, stir and mix evenly, slowly add 30 grams of epichlorohydrin, dropwise within 50 minutes After the completion of the dropwise addition, react at 60°C for 1.5h to obtain the modified polyethylene glycol 1000 intermediate;

[0047] (2) Mix 100 grams of alkali-processed wood pulp black liquor acid-analyzed alkali lignin (in terms of weight percentage, solid content is 95%) with water to prepare a suspension with a mass percentage concentration of 35%, and add sodium hydroxide to adjust When the pH reaches 11, slowly add the modified polyethylene glycol 1000 intermediate prepared in step (1) dropwise at 80°C, and the dropwise addition is completed within 2 hours. After the dropwise addition, react at 75°C for 3 hours, and adjust the pH after the reaction t...

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Abstract

The invention discloses a lignin based polyoxyethylene ether, a preparation method and application thereof. The preparation method comprises the steps of: heating and fusing polyethylene glycol, adding catalysts, then slowly adding epichlorohydrin in a dropwise manner to undergo reaction, thus obtaining a modified polyethylene glycol intermediate; heating alkali lignin to 60-80DEG C, and adding the modified polyethylene glycol intermediate dropwise to undergo reaction, thus obtaining the lignin based polyoxyethylene ether. The preparation method provided by the invention is carried out under normal pressure and low temperature, and is easy to operate and control. Due to direct introduction of a polyoxyethylene ether hydrophilic group into an alkali lignin molecule through grafting reaction, the side reaction is fewer, and the damage to the lignin structure is very small. Only two-step reaction is needed, and the reaction time is short. The product has good water solubility, is environmental friendly and non-toxic. The lignin based polyoxyethylene ether provided by the invention can be used as a dispersing agent of a pesticide suspension individually, and has the advantages of excellent dispersion and viscosity reduction performance, crystal growth inhibition, and high heat storage suspension rate.

Description

technical field [0001] The invention relates to a lignin-based polyoxyethylene ether, a preparation method thereof and an application as a pesticide suspending agent and dispersing agent. Specifically, the preparation method of the present invention uses wood pulp or bamboo pulp alkaline papermaking black liquor acid analysis alkali lignin as raw material, and carries out electrophilic substitution reaction with epichlorohydrin modified polyethylene glycol in alkaline aqueous solution Prepare lignin-based polyoxyethylene ether. Background technique [0002] Lignin is the second largest natural renewable resource in nature and an important resource for the future of mankind. At present, the lignin that can be used in industry mainly comes from the pulp and paper industry, and is mainly divided into water-soluble lignosulfonate (mainly obtained from the concentration of papermaking red liquor by sulfite acid method or prepared by sulfonation of alkali lignin) and Hardly wate...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G65/48C08H7/00A01N25/04A01N25/30
Inventor 邱学青周明松林绪亮杨东杰庞煜霞
Owner SOUTH CHINA UNIV OF TECH
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