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Microcapsule suspension concentrate for preventing and removing rice paddy weed and preparation method thereof

A water suspension and microcapsule technology, applied in herbicides and algicides, botanical equipment and methods, chemicals for biological control, etc., can solve the problems of high cost of weeding, incomplete weeding, etc., and achieve formulation Stable and uniform effect

Active Publication Date: 2014-04-30
SHANDONG DEHAO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The weeding with a single preparation is not thorough, and often requires two or even three times of application, and the cost of weeding is relatively high

Method used

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  • Microcapsule suspension concentrate for preventing and removing rice paddy weed and preparation method thereof
  • Microcapsule suspension concentrate for preventing and removing rice paddy weed and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of the capsule skin: add 50 grams of urea and 120 grams of 37% formaldehyde solution to 500 ml, adjust the pH value to 8.0 with sodium hydroxide under stirring, and react at 65 degrees for 1.5 hours to obtain the urea-formaldehyde resin prepolymer (as capsule skin material spare).

[0024] Preparation of microcapsule aqueous suspension: In a 1000ml three-neck bottle, add 50 grams of pretilachlor, 3.0 grams of pyrazosulfuron-methyl, and 48.5 grams of methyl isobutyl ketone in a water bath, stir until transparent, add 25 grams of urea-formaldehyde resin Add 2 grams of calcium dodecylbenzenesulfonate, 2.2 grams of nonylphenol polyoxyethylene ether, and 0.4 grams of sodium lauryl sulfate to the aqueous prepolymer solution, and stir at 1500 r / min for 30 minutes to form a stable water solution. Emulsion; then reduce the rotation speed to 700r / min, adjust the pH value to 2.0 with 5% dilute hydrochloric acid, and carry out polycondensation into capsules; gradually i...

Embodiment 2

[0025] Example 2 In a 30-liter three-necked bottle, add 5 kg of pretilachlor, 300 g of pyrazosulfuron-methyl, 4.8 kg of toluene and start stirring, heat in a water bath, stir until transparent, add 2.5 kg of urea-formaldehyde resin prepolymer aqueous solution, and then Add 200 grams of calcium dodecylbenzenesulfonate, 220 grams of nonylphenol polyoxyethylene ether, 40 grams of sodium lauryl sulfate, and control the speed at 1200r / min and stir for 30 minutes to form a stable water emulsion; then reduce the speed to 500r / min, use 5% dilute hydrochloric acid to adjust the pH value to 2.0, and carry out polycondensation to form capsules; gradually increase the temperature at about 55 degrees to solidify the capsule skin, and the reaction is completed in about 2 hours, and adjust the pH value to 7.0 with 20% sodium hydroxide solution. Finally, 300 grams of thickening agent polyvinyl alcohol was added, and antifreezing agent was added to make up water to 20 kilograms, and after stirr...

Embodiment 3

[0026] Example 3 Start stirring, put 200 kilograms of pretilachlor, 12 kilograms of pyrazosulfuron-methyl, and 190 kilograms of methyl isobutyl ketone into a 1500-liter shear kettle in sequence, open the steam valve, and control the temperature in the kettle between 35-45 degrees. Stir for about 30 minutes, sample the appearance, and start to drop 200 kg of pre-measured urea-formaldehyde resin prepolymer with a solid content of 50% after passing the test. After about 20 minutes, add 4 kg of dodecylbenzenesulfonic acid Calcium, 8.8 kilograms of nonylphenol polyoxyethylene ether, 2 kilograms of sodium lauryl sulfate, increase the stirring speed, control the rotating speed at about 1300 rpm, and keep it for about 10 minutes; then adjust the stirring speed to about 500 rpm, and use 5% Dilute hydrochloric acid to adjust the pH value to 2.0, raise the temperature to 55-60 degrees, and continue to react for three hours; then use liquid caustic soda to adjust the pH value to neutral, a...

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Abstract

The invention provides a microcapsule suspension concentrate combined by pyrazosulfuron with pretilachlor and a preparation method thereof. The microcapsule suspension concentrate provided by the invention takes the pyrazosulfuron and the pretilachlor in a weight ratio of 1:50-1:1 as effective components, takes urea resin as a capsule forming material and has no aggregation; the dosage form is stable and uniform; the closed weeding time is longer than that of the conventional dosage form by more than two time and reaches about 75 days; and in addition, the microcapsule suspension concentrate has the characteristics of thoroughness for weeding, less consumption, environment protection of the used solvent, and the like and can be used for preventing and removing gramineae, broad-leaved and cyperaceae weeds.

Description

technical field [0001] The invention relates to the field of herbicide compositions, in particular to a microcapsule aqueous suspension of pretilachlor and pyrazosulfuron-methyl for controlling weeds in paddy fields and its preparation. Background technique [0002] The beginning of chemical weeding in farmland can be traced back to the end of the 19th century. When preventing and controlling grape downy mildew in Europe, it was occasionally found that Bordeaux mixture could harm some cruciferous weeds without harming cereal crops; France, Germany, and the United States also discovered sulfuric acid and sulfuric acid The herbicidal effect of copper, etc., and used for weeding in wheat and other places. The organic chemical herbicide era began in 1932 with the discovery of the selective herbicide dinitrophenol. The emergence of 2,4-D in the 1940s greatly promoted the rapid development of the organic herbicide industry. Glyphosate, synthesized in 1971, has the characteristic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N47/36A01N37/22A01N25/04A01N25/28A01P13/00
Inventor 王铭韩勇赵守明郭家志绳继增韩洪强贺瑞军
Owner SHANDONG DEHAO CHEM
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