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High-molecular-weight lignin pesticide dispersant with high carboxyl group content and preparing method thereof

A high-molecular-weight, lignin-based technology, applied in the field of lignin-based pesticide dispersants and its preparation, can solve problems such as poor dispersion performance and narrow applicability, and achieve the effects of enhancing affinity, increasing molecular weight, and enhancing dispersion

Active Publication Date: 2016-04-20
图们市华威友邦化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of strong dispersing ability to pesticide particles, which can effectively improve the dispersing agent's ability to disperse pesticide particles, aiming at the shortcomings of commonly used lignosulfonate pesticide dispersants, such as strong hydrophilicity, poor dispersing performance and narrow applicability. Lignin-based pesticide dispersant with high carboxyl content and high molecular weight due to steric hindrance effect after adsorption

Method used

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  • High-molecular-weight lignin pesticide dispersant with high carboxyl group content and preparing method thereof
  • High-molecular-weight lignin pesticide dispersant with high carboxyl group content and preparing method thereof
  • High-molecular-weight lignin pesticide dispersant with high carboxyl group content and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] After mixing 100g of wood pulp alkali lignin and 100g of catechol evenly, add 20g of concentrated sulfuric acid and react at 115°C for 0.5h. Then cool to room temperature, dissolve it with 200g of absolute ethanol, take it out, pour it into water to precipitate, filter it with suction, wash it with hot water, and dry it to get phenolized wood pulp alkali lignin. Put the phenolized wood pulp alkali lignin and 30 g of octenyl succinic anhydride in a reactor at room temperature, add 800 g of dimethylformamide and 5 g of sodium hydroxide, and stir for 0.5 h. Raise the temperature to 80° C. to react for 2 hours, filter after the reaction, wash twice with ethanol with a mass concentration of 70%, and dry to obtain carboxylated wood pulp alkali lignin. Add carboxymethylated wood pulp alkali lignin into water, dissolve under stirring to form an aqueous solution with a concentration of 30% by mass, adjust the pH value to 12 with NaOH solution, add 10 g of epichlorohydrin, and co...

Embodiment 2

[0044] After mixing 60g of wood pulp alkali lignin, 20g of bamboo pulp alkali lignin, 20g of wheatgrass alkali lignin and 200g of catechol, add 40g of concentrated sulfuric acid and react at 105°C for 1h. Then cool to room temperature, dissolve it with 250g of absolute ethanol, take it out, pour it into water to precipitate, filter it with suction, wash it with hot water, and dry it to get phenolized wood pulp alkali lignin. Put the phenolized wood pulp alkali lignin and 40 g of dodecenyl succinic anhydride in a reactor at room temperature, add 1000 g of dimethylformamide and 5 g of sodium hydroxide, and stir for 0.5 h. Raise the temperature to 95° C. to react for 2.5 hours, filter after the reaction, wash twice with ethanol with a mass concentration of 65%, and dry to obtain carboxylated wood pulp alkali lignin. Add carboxymethylated wood pulp alkali lignin into water, dissolve under stirring to form an aqueous solution with a concentration of 30% by mass, adjust the pH value...

Embodiment 3

[0046] After mixing 100g of wood pulp alkali lignin and 150g of catechol evenly, add 30g of concentrated sulfuric acid and react at 105°C for 1h. Then cool to room temperature, dissolve it with 250g of absolute ethanol, take it out, pour it into water to precipitate, filter it with suction, wash it with hot water, and dry it to get phenolized wood pulp alkali lignin. Put the phenolized wood pulp alkali lignin and 50 g of octenyl succinic anhydride in a reactor at room temperature, add 1200 g of dimethylformamide and 5 g of sodium hydroxide, and stir for 0.5 h. Raise the temperature to 80° C. to react for 2 hours, filter after the reaction, wash twice with ethanol with a mass concentration of 70%, and dry to obtain carboxylated wood pulp alkali lignin. Add carboxymethylated wood pulp alkali lignin into water, dissolve under stirring to form an aqueous solution with a concentration of 40% by mass, adjust the pH value to 12 with NaOH solution, add 10 g of epichlorohydrin, and con...

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Abstract

The invention discloses a high-molecular-weight lignin pesticide dispersant with high carboxyl group content and a preparing method thereof. The preparing method includes the steps that after lignin and catechol are mixed evenly, concentrated sulfuric acid is added, and after reactions, the product is cooled to the room temperature, purified and dried to obtain phenolated lignin; the phenolated lignin and alkenyl succinic anhydride are placed in a reactor, and organic solvent and a sodium hydroxide solid are added and stirred; the temperature is raised to 80 DEG C-95 DEG C to conduct reactions, and carboxylation lignin is obtained after filtering, washing and drying; the carboxylation lignin is added into water to form a water solution under the stirring condition, the pH value is adjusted to 10-12, epoxy chloropropane is added to conduct a polycondensation reaction, and the pH value of a reaction solution is adjusted to 6-7 to obtain the lignin pesticide dispersant. The weight-average molecular weight of the obtained dispersant is larger than 15000, and the carboxyl group content is 3.2-4.0 mmol / g. The high-molecular-weight lignin pesticide dispersant is suitable for various kinds of pesticide wettable powder and water dispersible granules and has excellent dispersibility, stability, wettability and heat storing performance.

Description

technical field [0001] The invention relates to a pesticide dispersant, in particular to a lignin-based pesticide dispersant with high carboxyl content and high molecular weight and a preparation method thereof. The pesticide dispersant is suitable for 40% myclobutanazole wettable powder, 40% isoprocarb wettable powder, 80% dimethomorph water-dispersible granule, 80% carbendazim water-dispersible granule, 80% fipronil Dispersion of various pesticide preparations and formulations such as water-dispersible granules. Background technique [0002] According to the estimates of the Food and Agriculture Organization of the United Nations (FAO), the crops lost to diseases and insect pests in the world are 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. Due to their negative impact on environmental health, people are increasingly paying attention to environmental protection regu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08G65/26A01N25/30
CPCA01N25/30C08G65/2615C08H6/00
Inventor 邱学青庞煜霞贺政楼宏铭杨东杰黄锦浩
Owner 图们市华威友邦化工有限公司
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