Dispersion agent used for pesticide suspension concentrate and preparation method thereof

A technology for suspending and dispersing agent, applied in the field of dispersing agent and its preparation, can solve the problems of difficulty in improving the long-term stability of the preparation, easy growth of product crystals, poor product hydrophilicity, etc. The effect of resistance and bounce reduction

Inactive Publication Date: 2019-02-12
YANGZHOU SPED CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But, the dispersant that develops at present still has obvious defect when being applied to pesticide suspending agent
First of all, it is reported that styrene-maleic anhydride copolymer (SMA) reacts with fatty alcohol polyoxyethylene ether and N,N-dimethylethanolamine under the condition of propionic acid catalysis, wherein N,N dimethyl Small molecules of ethanolamine are preferentially esterified with SMA acid groups, and the remaining carboxyl groups are esterified with fatty alcohol polyoxyethylene ether to form a cationic amphiphilic surfactant with fatty alcohol polyoxyethylene ether as a solvent; but in the dispersant Contains only a few carboxylate ions and some tertiary amine groups, the product has a weak ionization degree and poor hydrophilicity. Although it can play the role of dispersing and suspending as the traditional polymer dispersant, but due to the ionic strength Poor, it is difficult to form a strong electrostatic repulsion, and the crystals of the product are easy to grow when placed for a long time, and it is difficult to be used in a high-salt-resistant system
Secondly, CN102421285B discloses that the polyaminoamide resin formed by the condensation of multifunctional fatty acids and multifunctional polyamines can effectively improve the salt tolerance of the suspension, and can still have a good suspension rate when pesticides and salt-containing fertilizers are mixed. ; but there is no mention of inhibiting crystal growth or reducing the bouncing of droplets on the target surface to improve deposition ability, and the product is a cross-linked structure with poor stability
And, CN107148970A discloses the nitrogen-containing surfactant (N+CH2COO-or amine oxide) of enhancing pesticide utilization rate, can enhance the compatibility of suspending agent and high-salinity glyphosate, glufosinate-ammonium aqueous solution; But, this The product is a small molecule straight chain structure, the dispersing effect is weak, and it is difficult to improve the long-term stability of the preparation

Method used

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  • Dispersion agent used for pesticide suspension concentrate and preparation method thereof
  • Dispersion agent used for pesticide suspension concentrate and preparation method thereof
  • Dispersion agent used for pesticide suspension concentrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First add 200.0g of SMA 1000 (CRAY VALLEY, styrene-maleic anhydride copolymer) and 1.1g of propionic acid to a four-neck flask equipped with a stirrer, thermometer and reflux condenser, then heat to 60°C and stir for 30min ; Then use a constant pressure dropping funnel to add 20.0g of N-benzyl-N-methylethanolamine to a four-necked flask, heat up to 90°C and reflux for 4h under stirring, and remove water under reflux; Adding a sodium hydroxide solution with a mass concentration of 30% neutralizes the reaction system to a pH of 6.1, adding metered deionized water to adjust the solid content (mass) to 40%, then adding 4.2g of hydrogen peroxide dropwise, then at 60°C Continue to react for 4h to obtain polymer dispersant PC-1.

[0041]

Embodiment 2

[0043] First add 280.0g of SMA EF-40 (CRAY VALLEY, styrene-maleic anhydride copolymer) and 13.4g of tetrabutyl titanate in a four-necked flask with stirrer, thermometer and reflux condenser, then heat Stir at 60°C for 30min; then add 56.0g of N,N-diisopropylethanolamine into the four-neck flask using a constant pressure dropping funnel, raise the temperature to 110°C and reflux for 6h under stirring conditions, and react under reflux Remove water; then add a mass concentration of 30% potassium hydroxide solution to neutralize to a pH of 7.8, add metered deionized water to adjust the solid content to 40%, then add 19.6g of hydrogen peroxide dropwise, and then continue the reaction at 90°C for 6h, that is Obtain polymer dispersant PC-2.

[0044]

Embodiment 3

[0046] First add 220.0 g of maleic anhydride and acrylic acid copolymer (Beijing Guangyuan Yinong Chemical Co., Ltd.) and 4.1 g of p-toluenesulfonate in a four-necked flask with a stirrer, a thermometer and a reflux condenser. acid, then heated to 60°C and stirred for 30min; then added 35.2g of dimethylpropylenediamine to a four-neck flask using a constant pressure dropping funnel, raised the temperature to 95°C and refluxed the reaction for 5h under stirring, and Remove water under reflux reaction; then add ammonia solution to neutralize to pH 6.5, add metered deionized water to adjust the solid content to 40%, add 12.3g hydrogen peroxide dropwise, and then continue to react at 70°C for 6h to obtain a polymer dispersant PC-3.

[0047]

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PUM

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Abstract

The invention discloses a dispersion agent used for pesticide suspension concentrate. By means of a nitrogenous group in the dispersion agent used for the pesticide suspension concentrate, the salt resistance performance of a preparation is improved, the destructive effect of suspension system salt on the preparation stability is reduced, a carboxyl-containing vinyl monomer co-polymer main structure provides good steric hindrance, electrostatic repulsion and solvation chain effects, and the suspension system physical stability can be guaranteed; in a pesticide application process, the fogdropbouncing performance is inhibited, the deposit rate of a pesticide on a target surface is improved, and the dispersion agent used for the pesticide suspension concentrate is beneficial for improving the utilization efficiency of the pesticide. Meanwhile, the invention discloses a preparation method of the dispersion agent used for the pesticide suspension concentrate; the method is simple, the yield is high, and the product use performance is excellent.

Description

technical field [0001] The invention relates to the technical field of dispersant and its preparation, in particular to a dispersant for pesticide suspension and its preparation method. Background technique [0002] Pesticide suspension concentrate (Suspension Concentrate, referred to as SC) refers to the dispersion of water-insoluble solid pesticide or water-immiscible liquid pesticide in water. Pesticide formulations prepared by wet ultrafine pulverization, such as agents, regulators and defoamers, are thermodynamically and kinetically unstable systems. The physical stability of pesticide aqueous suspensions during storage is the focus of current research on pesticide suspensions, mainly including stratification and particle deposition caused by gravity, flocculation and aggregation caused by interactions between particles, and Austenitic Ripening is the phenomenon of crystal growth of the particles in the formulation. At present, in order to solve the problem of the phy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/04A01N47/24A01N43/90C08F8/32C08F212/08C08F222/06C08F220/06C08F283/06
CPCA01N25/04A01N43/90A01N47/24C08F8/32C08F212/08C08F222/06C08F220/06C08F283/065
Inventor 余鹏程宋文勇曹雄飞曹小丽秦敦忠
Owner YANGZHOU SPED CHEM
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