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Dispersing agent special for pesticide water suspension agent and preparation method thereof

A technology of dispersing agent and suspending agent, applied in the agricultural field, can solve the problems of difficult control of molecular weight and distribution, unsatisfactory hard water resistance, etc., and achieve the effects of excellent dispersion performance, no environmental pollution, and short production cycle.

Inactive Publication Date: 2017-12-01
南京拓际生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Now the application of polycarboxylate dispersant is more and more widely, but the synthesis process of this kind of dispersant still has the technical problems that are difficult to control such as molecular weight and distribution, and the ability to resist hard water is not ideal.

Method used

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  • Dispersing agent special for pesticide water suspension agent and preparation method thereof
  • Dispersing agent special for pesticide water suspension agent and preparation method thereof
  • Dispersing agent special for pesticide water suspension agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) The special dispersant for pesticide aqueous suspension concentrate of the present embodiment is prepared according to the following steps:

[0028] Add 1000 parts of deionized water and 10 parts of sodium formate into a four-necked reaction flask, and heat while stirring; 500 parts of maleic acid and 10 parts of potassium persulfate were added within 1 hour, and then kept at 60°C for 2 hours (to obtain solution 2); after the heat preservation reaction was completed, the temperature was lowered to room temperature while stirring, and the system was neutralized with sodium hydroxide solution (i.e. in the solution 2) of the carboxylic acid, the neutralization amount is 50% of the molar number of the carboxylic acid to obtain the target dispersant solution; the dispersant solution is prepared according to the existing spray drying method to obtain the pesticide water of the present embodiment Special dispersant powder for suspending agent.

[0029] Adopt Gel Permeation...

Embodiment 2

[0036] The special dispersant for pesticide aqueous suspension concentrate of the present embodiment is prepared according to the following steps:

[0037] Add 1000 parts of deionized water and 100 parts of sodium formate into a four-necked reaction flask, and heat while stirring; when the temperature of the solution in the reaction flask rises to 70°C, add 200 parts of 2-vinylpyridine, 500 parts of maleic anhydride And 60 parts of potassium persulfate, add in 3 hours, then heat preservation reaction 2 hours; After heat preservation reaction finishes, drop to room temperature while stirring, neutralize the carboxylic acid in the system with sodium hydroxide solution, the neutralization amount is the carboxylic acid mole number 90% of the target dispersant solution was obtained; this dispersant solution was spray-dried to obtain the special dispersant powder for pesticide aqueous suspensions of the present embodiment.

[0038] Using gel permeation chromatography, using water as...

Embodiment 3

[0040] The special dispersant for pesticide aqueous suspension concentrate of the present embodiment is prepared according to the following steps:

[0041] Add 1000 parts of deionized water and 20 parts of sodium formate into a four-necked reaction flask, and heat while stirring; when the temperature of the solution in the reaction flask rises to 80°C, add 200 parts of 2-vinylpyridine, 600 parts of acrylic acid and Parts of potassium persulfate, added within 2 hours, then heat-preserved for 3 hours; after the heat-preserved reaction was completed, it was lowered to room temperature while stirring, and the carboxylic acid in the system was neutralized with sodium hydroxide solution, and the neutralization amount was 80% of the molar number of carboxyl groups , to obtain the target dispersant solution; the dispersant solution is spray-dried to obtain the special dispersant powder for pesticide aqueous suspension in this embodiment.

[0042] Using gel permeation chromatography, u...

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Abstract

The invention discloses a dispersing agent special for a pesticide water suspension agent and a preparation method thereof, relates to the technical field of agriculture, and aims to provide the dispersing agent special for the pesticide water suspension agent, which has the advantages of simple operation, low cost and safety and environmentally friendly effect and the preparation method thereof. The dispersing agent special for the pesticide water suspension agent is prepared from the following raw materials in parts by mass: 100 to 600 parts of 2-vinylpyridine, 100 to 900 parts of organic acid, 1000 parts of deionized water, 10 to 150 parts of chain transfer agent, 10 to 150 parts of initiator and 6 to 20 parts of alkali. The dispersing agent special for the pesticide water suspension agent has the characteristic of large molecular weight; the dispersing agent is used as an auxiliary to prepare the pesticide water suspension agent, the dosage of the dispersing agent is little, and the prepared pesticide water suspension agent has good dispersibility and high suspension rate in standard hard water. The dispersing agent special for the pesticide water suspension agent has the advantages of simple preparation process, short production period and low production cost, has no environmental pollution in the production process, and is suitable for industrial scale production.

Description

technical field [0001] The invention relates to the technical field of agriculture, in particular to a dispersant for pesticide water suspensions. Background technique [0002] The so-called dispersant refers to a class of substances that can prevent the mutual aggregation of solid-liquid dispersion particles and keep solid particles uniformly dispersed in the liquid phase for a long time. [0003] Traditional dispersants mainly include anionic surfactants and nonionic surfactants. Anionic surfactants include: sulfonate surfactants, phosphate surfactants and sulfate surfactants. Nonionic surfactants include: alkylphenol polyoxyethylene phosphate and polyoxyethylene polyoxypropylene ether block copolymer. The most important of the traditional dispersants are lignosulfonate and its derivatives, naphthalene or alkylnaphthalene formaldehyde condensate sulfonate and its derivatives. [0004] The polycarboxylate dispersant can stabilize the system through steric hindrance and e...

Claims

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Application Information

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IPC IPC(8): A01N25/30A01N25/04A01N51/00A01N43/54A01N43/653A01P3/00A01P7/04C08F126/06
CPCA01N25/04A01N25/30A01N43/54A01N43/653A01N51/00C08F126/06
Inventor 卞维鑫何华雄朱极张琦徐卫灿
Owner 南京拓际生物科技有限公司
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