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Pesticide microcapsule

A technology of microcapsules and pesticides, applied in the fields of animal repellents, botanical equipment and methods, biocides, etc., can solve the problems of difficult performance regulation, high price, restrictions, etc., and achieve long-term pesticide slow-release effect and shell material cost. Low, reducing the effect of decomposition and loss

Inactive Publication Date: 2007-11-21
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although most of the traditional natural polymers have good degradation performance and low price, their practical application is limited because their properties are not easy to control; while polylactic acid, polyhydroxyalkanoate, polycaprolactone, etc. Synthetic polymers such as esters are usually expensive, and usually, pharmaceutical sustained-release microcapsules are mainly used in the environment of human body fluids, and it is rare and difficult to have large-scale applications in natural environments, especially soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Dissolve 0.2 g of biodegradable polymer polybutylene succinate (PBS) in 10 ml of chloroform at room temperature, and then dissolve 0.8 g of pesticide chlorpyrifos.

[0036] 0.3 g of polyethylene oxide (20) sorbitan monostearate and 0.3 g of polyvinyl alcohol were dissolved in 100 ml of water.

[0037] Mix the above aqueous solution with chloroform solution dissolved in chlorpyrifos and polybutylene succinate, disperse and emulsify at high speed with a disperser, and emulsify at a stirring speed of 10000rpm for 5-10 minutes.

[0038] Heat the emulsified emulsion with a water bath to slowly raise the temperature, control the water temperature at 25-50°C and the stirring speed at 800rpm, and remove the chloroform. Finally, pesticide microcapsules with an average diameter of 0.3-40 μm are produced, and the diameter of the pores in the wall of the pesticide microcapsules is 0.01-3 μm. Figure 1, Figure 2.

Embodiment 2

[0040] In 20 ml of dichloromethane at room temperature, dissolve 0.6 g of butanediol succinate adipate copolyester (PBSA), and then dissolve 1.2 g of chlorpyrifos.

[0041] 0.1 g of sodium lauryl sulfate and 0.4 g of polyvinyl alcohol were dissolved in 150 ml of water. Among them, the degree of polymerization of polyvinyl alcohol is 1750, and the degree of alcoholysis is 88%.

[0042] The above aqueous solution is mixed with the dichloromethane solution dissolved in chlorpyrifos and butanediol succinate adipate copolyester, emulsified at high speed with a disperser, and emulsified at a stirring speed of 12000 rpm for 5-10 minutes.

[0043] The emulsified emulsion was slowly heated in a water bath from room temperature to 40° C., and dichloromethane was removed at 800 rpm. In the heating process, finally, pesticide microcapsules with an average diameter of 0.3-40 μm are produced, and the diameter of the pores in the wall of the pesticide microcapsules is 0.01-3 μm. Figure 1, ...

Embodiment 3

[0045] In 20 ml of dichloromethane at room temperature, dissolve 0.6 g of butanediol succinate adipate copolyester (PBSA), and then dissolve 1.5 g of diazinon (Dianon).

[0046] 0.2g polyoxyethylene (20) sorbitan monooleate, 1.0g polyvinyl alcohol were dissolved in 150ml water. Wherein the degree of polymerization of polyvinyl alcohol is 1750, and the degree of alcoholysis is 88%.

[0047]The above aqueous solution is mixed with the dichloromethane solution dissolved in chlorpyrifos and butanediol succinate adipate copolyester, emulsified at high speed with a disperser, and emulsified at a stirring speed of 6000 rpm for 5-10 minutes.

[0048] The emulsified emulsion is slowly heated from room temperature to 40° C. in a water bath, and methylene chloride is removed at 800 rpm to manufacture pesticide microcapsules with an average diameter of 0.3 to 40 μm. The diameter of the capsule wall holes of the pesticide microcapsules is 0.01 to 3 microns.

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Abstract

The invention is concerned with the pesticides microcapsule, which the material of the wall is the fat group polyester macromolecule and can be biodegradation; it is made of the method that latex solvent volatilization - condensing. The main material of the microcapsule is the poly butane diacid dibastic alcohol ester and the copolyester with better degradation feature and film-forming feature, or poly hexane diacid butanediol butylenes glycol ester, the cost of the shell is lower, the preparing technics is simple.

Description

technical field [0001] The present invention relates to pesticide microcapsules. technical background [0002] Microcapsule technology is a technology that coats active substances on polymer substrates for slow release. Due to its advantages of reducing toxic and side effects, reducing the amount of active substances, improving utilization efficiency, improving material form, shielding odor, controlling and prolonging release, microencapsulation technology has shown great promise in the fields of medicine, pesticides, fertilizers, and daily chemicals. Broad application prospects. [0003] In the field of pesticide microcapsules, a large number of materials such as polyurea, polyamide, and polyolefin are used as wall materials, but because they do not have degradability, they are easy to cause white pollution after use, and the microcapsules obtained with such wall materials are less The sustained release route is a single osmotic release mechanism, which has certain limita...

Claims

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Application Information

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IPC IPC(8): A01N25/28A01N57/16A01N57/10
Inventor 季君晖曾军石峰晖王晓青严庆
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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