A kind of lignin-based polyoxyethylene ether and its preparation method and application

A technology based on polyoxyethylene ether and alkali lignin, which is applied in botany equipment and methods, applications, biocides, etc., can solve the problems of poor product dispersion and poor ability to inhibit the growth of original drug particle crystals, and achieve Excellent dispersion and viscosity reduction performance, rich variety and application range, less side effects

Active Publication Date: 2016-06-22
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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  • A kind of lignin-based polyoxyethylene ether and its preparation method and application
  • A kind of lignin-based polyoxyethylene ether and its preparation method and application
  • A kind of lignin-based polyoxyethylene ether and its preparation method and application

Examples

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Embodiment 1

[0037] A preparation method of lignin-based polyoxyethylene ether includes 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 evenly, slowly add 10 grams of epichlorohydrin dropwise, and add dropwise within 30 minutes. After completion, react at 50°C for 1 hour to obtain modified polyethylene glycol 400 intermediate;

[0039] (2) Mix 100 grams of alkali pulping wood pulp black liquor with acid precipitation lignin (in 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 pH to 10.5, slowly add the modified polyethylene glycol 400 intermediate prepared in step (1) at 70°C, and the addition is completed within 1.5h. After the addition is complete, react at 80°C for 2h, and adjust after the reaction is complete pH to 7.0, cooling to room temperature to obtain lignin-based polyoxyethy...

Embodiment 2

[0041] A preparation method of lignin-based polyoxyethylene ether includes 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, and add dropwise After completion, react at 40°C for 2 hours to obtain modified polyethylene glycol 2000 intermediate;

[0043] (2) Mix 100 grams of alkali pulping bamboo pulp black liquor with acid precipitation lignin (in 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 pH to 10, slowly add the modified polyethylene glycol 2000 intermediate prepared in step (1) at 60°C. The addition is completed within 1h. After the addition is complete, react at 70°C for 4h, and adjust the pH after the reaction. To 6.0, cool to room temperature to obtain lignin-based polyoxyethylene ether ...

Embodiment 3

[0045] A preparation method of lignin-based polyoxyethylene ether includes 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, and add dropwise within 50 minutes After the addition is complete, react at 60°C for 1.5 hours to obtain the modified polyethylene glycol 1000 intermediate;

[0047] (2) Mix 100 grams of alkali pulping wood pulp black liquor with acid precipitation lignin (in 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 pH to 11, slowly add the modified polyethylene glycol 1000 intermediate prepared in step (1) at 80°C, dropwise addition is completed within 2h, after the dropwise addition, react at 75°C for 3h, adjust the pH after the reaction is complete After cooling to room temperature to 7.0, the lignin...

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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 application as a pesticide suspension dispersant. Specifically, the preparation method of the present invention uses wood pulp or bamboo pulp soda papermaking black liquor acidification and alkali lignin as raw materials, and performs 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 mankind in the future. At present, the lignin that can be used industrially mainly comes from the pulp and paper industry, and is mainly divided into water-soluble lignin sulfonates (mainly obtained from the concentration of papermaking red liquor by the sulfite hydrochloric acid method or prepared by alkali lignin sulfonation) and Insoluble alkali l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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