Pesticide micro-capsule granules and preparation method thereof

A technology of microcapsule granules and microcapsule suspensions, which is applied in the field of pesticide microcapsule granules and its preparation, can solve the problems of reduced decomposition rate of active ingredients, poor storage stability, poor chemical stability, etc. Dosage, good control and prevention effect, easy operation effect

Inactive Publication Date: 2011-06-22
联合国南通农药剂型开发中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (3) The decomposition rate of active ingredients in the environment is greatly reduced after being wrapped in the capsule shell material;
[0011] (1) The stability of storage is not good, and it is eas

Method used

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  • Pesticide micro-capsule granules and preparation method thereof
  • Pesticide micro-capsule granules and preparation method thereof
  • Pesticide micro-capsule granules and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0066] The first step, preparation of pesticide microcapsule suspension:

[0067] The existing technology of pesticide microencapsulation mainly consists of three process routes:

[0068] The first is to adopt the route of interfacial polymerization, usually using isocyanate (TDI) or prepolymer (MDI) to react with polyamine or polyol to form a polyurea resin shell material.

[0069] The second method adopts the in-situ polymerization process route, generally adopts the urea-formaldehyde prepolymer solution to form the capsule, and controls the process parameters such as the acid addition speed, the acid addition method, the curing temperature, the solution stirring speed, etc., and adjusts the pH range , Under catalysis, polycondensation forms strong and impermeable microcapsules.

[0070] The third is a complex coagulation preparation process. In an aqueous solution mixed with dissolved natural polymer materials (such as gelatin and gum arabic), the solubility of natural polymer mate...

Example Embodiment

[0085] Example 1: Formula components of abamectin microcapsule suspension

[0086]

[0087] Disperse 30kg of insecticide abamectin and 3kg of carrier white carbon black in 15kg of soybean oil (commercially available), stir evenly (oil phase), and then sand through a sand mill until the material is average The particle size reaches 2um~8um, then add 4kg of toluene diisocyanate TDI (Cangzhou Dahua TDI Co., Ltd.) and stir evenly (oil phase); then prepare the water phase: add 10kg of 10% polyvinyl alcohol PVA aqueous solution to 40kg of deionized water Stir evenly (water phase); put the prepared oil phase materials into the water phase and turn on high-speed homogenization to form a stable O / W emulsion; turn on the stirring (maintain 800 rpm), and then heat the homogenized emulsion to Maintain a stable curing temperature of the capsule wall material at 70°C for 3 hours, then add 0.1 kg of glacial acetic acid with a pH regulator to adjust the pH to about 7, and 0.5 kg of silicone defo...

Example Embodiment

[0089] Example two, formula components of alachlor microcapsule suspension

[0090]

[0091] Heat 20 kg of the herbicide alachlor to a molten state, add 2 kg of polyphenyl polymethylene polyisocyanate PAPI (Bayer, Germany) and 1 kg of diphenylmethane diisocyanate MDI (Yantai Wanhua Polyurethane Co., Ltd.) Stir evenly (oil phase); add 0.2kg of methyl cellulose CMC to 50kg of deionized water, stir evenly (water phase), put the prepared oil phase materials into the water phase and turn on high-speed homogenization to form a stable O / W emulsion; start stirring (maintain 400 revolutions / min), then heat the homogenized emulsion to 40°C, and slowly add 0.5 kg of ethylene diamine to maintain a stable curing temperature of the capsule wall material for 20 hours, and then add the lubricant Wet agent NNO 3.0kg (Shanghai Tiantan Auxiliary Factory), dispersant sodium lignosulfonate (made in Russia) 5.0kg, disintegrant modified starch 1.0kg, white carbon black 17kg, pH regulator 0.2kg glacial...

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Abstract

The invention discloses micro-capsule granules and a preparation method thereof. The pesticide micro-capsule granules mainly comprise the following ingredients in percentage by weight: 5 to 75 percent of pesticide active ingredient, 1 to 10 percent of capsule wall material, 1 to 3 percent of wetting agent, 3 to 8 percent of dispersing agent, 0 to 10 percent of adjuvant and 10 percent of carrier filler. The preparation method comprises the following steps of: wrapping a micro-capsule by using active pesticide as a capsule core and using a high molecular material as a capsule shell material; preparing a micro-capsule suspending agent CS from water serving as a basic dispersant medium; and drying the micro-capsule suspending agent CS to prepare granules by using drying equipment to form a pesticide new formulation of the micro-capsule granules with control release effect. The invention has the advantages that: the pesticide micro-capsules are more environmentally-friendly and safer for a human body, have good control and prevention effects on targeted pests and are convenient to use.

Description

technical field [0001] The invention belongs to the field of pesticide formulation processing, and in particular relates to a pesticide microcapsule granule and a preparation method thereof. Background technique [0002] Microcapsules (Encapsulated Granule, CG) use polymer materials as the capsule wall or membrane, and wrap the pesticide active substance as the capsule core by chemical, physical or physicochemical methods to form a semi-permeable capsule. Microcapsules of the capsule, and solid particles formed by aggregating multiple microcapsules. The active substance in the capsule core is released slowly under controlled conditions to meet the requirements of suitable control effect. Microcapsules can be diluted with water and then sprayed, and diluted with water to form a suspension for use. The average particle size of the suspension can be in the range of 2-50 microns, which is a typical pesticide controlled release agent; at the same time, microcapsules can also be ...

Claims

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Application Information

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IPC IPC(8): A01N25/28A01N43/90A01N37/26A01N57/16A01P7/04A01P13/00B01J13/16
Inventor 曹雄飞仲苏林吴建兰曹新梅章东生
Owner 联合国南通农药剂型开发中心
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