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Insecticide pirimiphos-methyl microcapsule suspension and preparation method

A technology of methyl pyrimidine phosphine microcapsules and methyl pyrimidine phosphine is applied in the directions of microcapsule preparations, insecticides, and microsphere preparation, etc., and can solve the problems of restricting the use of active substances, high toxicity of isocyanates, and long time for wall materials, etc. Achieving the effect that the particle size can be adjusted, the pest resistance can be delayed, and the number of applications can be reduced

Inactive Publication Date: 2012-09-12
HUNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The capsule material of the most commonly used microcapsule is polyurea now, but the preparation method of polyurea has the long time of generating wall material, must require to react under the condition of lower pH value, and must require that the core material does not contain any Defects in functional groups that can react with amines or aldehydes, which limit the use of some promising active substances
Another way is to use polyisocyanate interfacial polymers to form microcapsules, but due to the high toxicity of isocyanate, there are certain hazards in the process of production and use.
[0006] So far, there have been no reports of pirimiphos-methyl microcapsule suspensions made of non-toxic and biodegradable capsules and used to control storage and commercial crop pests

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Under the protection of nitrogen, 10g chitosan and 50g glycolide were dispersed into 50ml dimethyl sulfoxide solution, 5ml triethylamine was added, and the temperature was raised to 80°C for 10 hours to obtain chitosan-aliphatic Polyester graft copolymer. After determination, the molecular weight of chitosan-polyglycolide copolymer is 20000Da;

[0028] (2) 15g of chitosan-polyglycolide graft polymer and 30g of pyrimiphos-methyl were dissolved in 20ml of dichloromethane;

[0029] (3) Under the condition of stirring, add the solution in (2) dropwise into the aqueous solution containing polyvinyl alcohol, and mix well. Then shear at high speed for 5 minutes to obtain an emulsion;

[0030] (4) removing the solvent methylene chloride of the emulsion in (3);

[0031] (5) Add dispersant, thickener and antifreeze to obtain a stable microcapsule suspension that can be transported and stored.

Embodiment 2

[0033] (1) Under the protection of nitrogen, 5g chitosan and 30g caprolactone were dispersed into 50ml dimethyl sulfoxide solution, 3ml triethylamine was added, and the temperature was raised to 80°C for 10 hours to obtain chitosan-aliphatic Polyester graft copolymer. After determination, the molecular weight of chitosan-polycaprolactone copolymer is 30000Da;

[0034] (2) 25g chitosan-polycaprolactone graft polymer and 10g pyrimiphos-methyl were dissolved in chloroform of 30ml;

[0035] (3) With stirring, add the solution in (2) dropwise to the aqueous solution containing Tween-80, and mix well. Then shear at high speed for 5 minutes to obtain an emulsion;

[0036] (4) removing the solvent chloroform of the emulsion in (3);

[0037] (5) Add dispersant, thickener and antifreeze to obtain a stable microcapsule suspension that can be transported and stored.

Embodiment 3

[0039] (1) Under nitrogen protection, disperse 10g chitosan and 30g lactide into 50ml dimethyl sulfoxide solution, add 3ml triethylamine, and react at 80°C for 10 hours to obtain chitosan-aliphatic Polyester graft copolymer. After determination, the molecular weight of chitosan-polylactide copolymer is 6500Da;

[0040] (2) 40g of chitosan-polylactide graft polymer and 20g of pirimiphos-methyl were dissolved in 30ml of ethyl acetate;

[0041] (3) With stirring, add the solution in (2) dropwise to the aqueous solution containing EL-20, and mix well. Then shear at high speed for 5 minutes to obtain an emulsion;

[0042] (4) removing the solvent ethyl acetate in (3) emulsion;

[0043] (5) Add dispersant, thickener and antifreeze to obtain a stable microcapsule suspension that can be transported and stored.

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Abstract

The invention discloses an insecticide pirimiphos-methyl microcapsule suspension and a preparation method. The insecticide pirimiphos-methyl microcapsule suspension comprises the following components in percentage by weight: 0.1-70 percent of pirimiphos-methyl, 1-10 percent of chitosan-aliphatic polyester grafted copolymer, 2-5 percent of organic solvent, 1-10 percent of emulsifier, 1-5 percent of dispersant, 2-10 percent of thickening agent, 1-5 percent of anti-freezing agent and the balance of water. The particle diameter of the microcapsules is 0.1-100 mum, and the particles are regular spheres. A chitosan derivative is used as a capsule material; and the insecticide pirimiphos-methyl microcapsule suspension has the advantages of biodegradability, bioavailability, biological adhesion, permeation promotion effect, no toxic or side effect and the like. The insecticide pirimiphos-methyl microcapsule suspension is mainly used for pest prevention and control of warehousing, homes, public sanitation and economic crops such as flowers and fruits.

Description

technical field [0001] The invention relates to an insecticide pirimiphos-methyl microcapsule suspension and a preparation method. Background technique [0002] Microcapsule suspensions have been widely used in the field of pesticide preparations to reduce the toxicity of pesticides to humans and animals, extend the duration of effectiveness, reduce evaporation, avoid drug damage, protect pesticides from rapid degradation in the environment, reduce dripping, reduce The content of pesticides in the environment, increasing the scope of application of pesticides, etc. [0003] Pirimiphos-methyl is a high-efficiency, low-toxicity, broad-spectrum, quick-acting organophosphorus insecticide and acaricide, which can be widely used in household hygiene, public health and the control of crop pests. It has the advantages of fast knockdown and good effect. At the same time, it can be used as an effective substitute for phosphine to prevent and control storage pests. The dosage is low a...

Claims

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Application Information

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IPC IPC(8): A01N25/28A01N57/16A01N25/04A01P7/04A01P7/02B01J13/02
Inventor 李敏李涛欧晓明陈九星高恒旭
Owner HUNAN CHEM RES INST
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