High molecular weight and moderate sulfonation degree lignin-based pesticide dispersant and its preparation method

A lignin-based, high-molecular-weight technology, applied in botany equipment and methods, biocides, animal repellants, etc., can solve the problems of small molecular weight and poor dispersion performance of dispersants, and achieve strong adsorption stability and strong adsorption Ability, hydrophilic group and lipophilic group distribution obvious effect

Active Publication Date: 2012-11-21
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to address the shortcomings of the existing lignosulfonate pesticide dispersant with low molecular weight, excessively uniform distribution of hydrophilic groups and lipophilic groups, and poor dispersion performance. The raw material is to provide a high-molecular-weight medium-sulfonated lignosulfonate pesticide high-efficiency dispersant. The weight-average molecular weight of the dispersant is greater than 15,000 and the sulfonated degree is 0.6-1.0mmol / g.

Method used

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  • High molecular weight and moderate sulfonation degree lignin-based pesticide dispersant and its preparation method
  • High molecular weight and moderate sulfonation degree lignin-based pesticide dispersant and its preparation method
  • High molecular weight and moderate sulfonation degree lignin-based pesticide dispersant and its preparation method

Examples

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Embodiment 1

[0039] Example 1: Weigh 50g of wood pulp and papermaking black liquor powder, add 50mL, 10mol / L NaOH solution to swell at room temperature for 30min; then add 20g of benzyl chloride, stir the oil bath to 100°C and carry out etherification reaction for 3h ; Add 300 g of water, 100 g of sodium lignosulfonate, and 25 g of aqueous formaldehyde solution (formaldehyde mass content is 37%), and perform a copolymerization reaction at 85° C. for 3 h. Finally, a sulfuric acid solution with a mass concentration of 20% is used to adjust the pH to 7, and then the product is cooled to room temperature to obtain a lignin-based pesticide high-efficiency dispersant liquid product.

Embodiment 2

[0040] Example 2: Weigh 50g of bamboo pulp black liquor powder, add 50mL, 10mol / L NaOH solution to swell for 60min at room temperature; then add 30g of benzyl chloride, heat the stirring oil bath to 95°C and carry out etherification reaction for 2h; Add 200 g of water, 60 g of sodium lignosulfonate, and 40 g of formaldehyde aqueous solution (formaldehyde mass content is 37%), and perform a copolymerization reaction at 95° C. for 2 hours. Finally, a nitric acid solution with a concentration of 20 wt% is used to adjust the pH to 7, and then the product is cooled to room temperature to obtain a liquid product of a lignin-based pesticide high-efficiency dispersant.

Embodiment 3

[0041] Example 3: Weigh 50g of wheat straw pulp black liquor powder, add 50mL, 10mol / L NaOH solution to swell for 40min at room temperature; then add 20g of benzyl chloride, heat the stirring oil bath to 110°C and carry out etherification reaction for 4h; Add 300 g of water, 70 g of sodium lignosulfonate, and 50 g of formaldehyde aqueous solution (formaldehyde mass content is 37%), and carry out a copolymerization reaction at 95° C. for 2 h. Finally, a hydrochloric acid solution with a concentration of 20 wt% is used to adjust the pH to 8, and then the product is cooled to room temperature to obtain a lignin-based pesticide high-efficiency dispersant liquid product.

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Abstract

The invention discloses a high molecular weight and moderate sulfonation degree lignin-based pesticide dispersant and its preparation method. The preparation method consists of: first adding a NaOH solution into lignin powder to conduct swelling for 30-60min; adding benzyl chloride, and under the condition of an oil bath at 95-110DEG C, carrying out an etherification reaction for 2-4h; then adding water, sodium lignosulphonate, and a formaldehyde aqueous solution to perform a copolymerization reaction at 80-95DEG C for 1-3h; and adjusting the pH value to 5-9, thus obtaining the high molecular weight and moderate sulfonation degree lignin-based pesticide dispersant. The dispersant prepared in the invention has a weight-average molecular weight of more than 15000 and a sulfonation degree of 0.6-1.0mmol / g, is applicable to 80% dimethomorph water dispersible granules, 80% carbendazim water dispersible granules, 40% myclobutanil wettable powder, and a plurality of pesticide preparations and dosage forms, and has excellent dispersibility, stability, wettability and thermal storage performance.

Description

technical field [0001] The invention relates to a pesticide dispersant, in particular to a high molecular weight medium-sulfonated lignin-based pesticide dispersant and a preparation method thereof. The pesticide dispersant is suitable for the dispersion of various pesticide preparations and dosage forms such as dimethomorph water-dispersible granules, carbendazim water-dispersible granules, myclobutanil wettable powders, etc. Background technique [0002] According to the estimates of the Food and Agriculture Organization of the United Nations (FAO), the annual loss of crops due to pests and diseases in the world is about 10% to 30% of the total harvest of the year; pesticides are an important means of preventing and controlling pests and weeds and protecting crops. The development of new preparations that are efficient, dust-free and easy to use, including reducing the use of organic solvents, water-dispersible granules, wettable powders, suspension concentrates, etc. have...

Claims

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Application Information

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IPC IPC(8): C08H7/00A01N25/30
Inventor 邱学青楼宏铭庞煜霞杨东杰欧阳新平易聪华周明松邓永红
Owner SOUTH CHINA UNIV OF TECH
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