High performance cypermethrin micro-capsule emulsion

A technology of high-efficiency cypermethrin and microcapsule suspending agent, which is applied in biocides, biocides, animal repellents, etc., can solve the problems of less application, achieve safe storage and transportation, easy control, and improve the effective utilization rate

Inactive Publication Date: 2006-06-28
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the microcapsules prepared by urea-formaldehyde resin are mainly used in the textile printing and dyeing industry, and are rarely used in the pesticide industry. The present invention provides a preparation technology for high-efficiency cypermethrin microcapsule suspensions using it as a wall material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add urea and formaldehyde into a three-necked flask equipped with a thermometer and a stirring device, the molar ratio is 1:2.0, after dissolving, add deionized water twice the weight of formaldehyde and urea, adjust the pH value to 8.5 with triethanolamine, and raise the temperature to 70 °C, stirring at low speed for 1 hour to obtain an aqueous solution of urea-formaldehyde resin prepolymer.

[0030] Under normal temperature, 2.6g 97% beta-cypermethrin former drug is completely dissolved in 4.0g xylene, while stirring, add 5g of the above-mentioned urea-formaldehyde resin prepolymer aqueous solution, and add 7.5g 5% sodium polyacrylate aqueous solution, stir at 1500 rpm Form a stable O / W emulsion; reduce the speed to 800 rpm, add 1M hydrochloric acid in 5 batches within 60 minutes to adjust the pH of the system to 2.0, and polycondense for 1 hour; then increase the temperature to 45°C to solidify the capsule wall for 1.5 hours before adding Adjust the pH to 7.0 with s...

Embodiment 2

[0032] Add urea and formaldehyde into a three-necked flask equipped with a thermometer and a stirring device, the molar ratio is 1:2.0, after dissolving, add deionized water twice the weight of formaldehyde and urea, adjust the pH value to 8.5 with triethanolamine, and raise the temperature to 70 °C, stirring at low speed for 1 hour to obtain an aqueous solution of urea-formaldehyde resin prepolymer.

[0033] Dissolve 5.2g 97% beta-cypermethrin technical substance completely in 5.0g toluene at normal temperature, add 7.5g above-mentioned urea-formaldehyde resin prepolymer aqueous solution while stirring, and add 10g 5% sodium polyacrylate aqueous solution, stir at 1500 rpm to form Stable O / W emulsion; reduce the speed to 800 rpm, add 1M hydrochloric acid in 5 batches within 60 minutes to adjust the pH of the system to 2.0, and polycondense for 1 hour; then raise the temperature to 45°C to solidify the capsule wall for 2 hours and then add hydrogen Adjust the pH to 7.0 with sod...

Embodiment 3

[0035]Add urea and formaldehyde into a three-necked flask equipped with a thermometer and a stirring device, the molar ratio is 1:2.5, after dissolving, add deionized water twice the weight of formaldehyde and urea, adjust the pH value to 8.5 with triethanolamine, and raise the temperature to 70 °C, stirring at low speed for 1 hour to obtain an aqueous solution of urea-formaldehyde resin prepolymer.

[0036] Under normal temperature, 10.4g 97% beta-cypermethrin active drug is completely dissolved in 6.0g benzene, while stirring, add 15g of the above-mentioned urea-formaldehyde resin prepolymer aqueous solution, and add 20g of 5% sodium polyacrylate aqueous solution, and stir at 1500 rpm to form a stable O / W emulsion; reduce the speed to 800 rpm, add 1M dilute hydrochloric acid in 5 batches within 60 minutes to adjust the pH of the system to 2.0, and polycondense for 1.5 hours; then raise the temperature to 50°C to solidify the capsule wall for 2 hours and then add hydrogen Adj...

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Abstract

A microcapsule suspension of high-effect cypermethrin is proportionally prepared from high-effect cypermethrin, core solvent, protective colloid, wall material (urea and formaldehyde), wettable disperser, viscosity regulator and water through pre-polymerizing of urea and formaldehyde, depositing on the surface of core while polymerizing, solidifying and preparing microcapsule suspension. It has low poison and high and durable effect.

Description

(1) Technical field [0001] The invention relates to a microcapsule suspension of the insecticide beta-cypermethrin and a preparation method thereof, belonging to the technical field of new formulations and preparation of pesticides. (2) Background technology [0002] Beta-cypermethrin belongs to the class of pyrethroid insecticides and is obtained by further refining cypermethrin. Because the latter is a mixture of 8 isomers, namely 1RcisR / 1ScisS or 1RtransR / 1StransS (low-efficiency cis-trans), 1RcisS / 1ScisR or 1Rtrans / 1StransR (high-efficiency cis-trans) has only two high-efficiency isomers, which only account for about 40% of the total esters including their enantiomers. At present in China, industrial cypermethrin is generally used as a raw material to transpose the low-efficiency form in it according to the crystallization-epimerization method to obtain the high-efficiency form, which is beta-cypermethrin. [0003] Because beta-cypermethrin has outstanding contact and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N53/08A01N25/28A01P15/00
Inventor 慕卫刘峰赵德
Owner SHANDONG AGRICULTURAL UNIVERSITY
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