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Phytocide granule and preparation method of granule

A technology of herbicides and granules, which is applied in the field of herbicide granules and its preparation, can solve the problems of low herbicide loading and poor slow-release effect, and achieve control of pesticide pollution, prolong release time, and strengthen slow-release effect of effect

Inactive Publication Date: 2011-10-19
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the clay carrier itself has a low load of herbicides, and the mass content of herbicides is usually below 4%, and the slow-release effect becomes significantly worse after the drug load is increased.

Method used

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  • Phytocide granule and preparation method of granule
  • Phytocide granule and preparation method of granule
  • Phytocide granule and preparation method of granule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 5 g of carboxymethyl chitosan to 100 g of water, stir until it is completely dissolved, then add 3 g of bentonite, 2 g of herbicide 2,4-D-butyl (2,4-dichlorophenoxybutyl acetate) , stir thoroughly to form a homogeneous suspension. Prepare 1000 mL of calcium chloride (cross-linking agent) aqueous solution with a mass concentration of 6%, add the above suspension into the cross-linking agent solution dropwise with a peristaltic pump, and react at 60°C for 5 minutes to obtain a granular product. Filter out and then dry at 70°C for 2 h to obtain herbicide granules with an average particle size of about 0.8 mm. After extraction and analysis, the mass content of 2,4-D butyl ester in the preparation was 18.2%, and the loading rate of 2,4-D butyl ester was 91.0%.

[0019] The herbicide preparation prepared above was subjected to a release test, and 100 mg of the preparation sample was put into 1000 mL of water. After a certain interval, water samples were taken to analyze ...

Embodiment 2

[0021] 4.5 g of bentonite was taken and ion-exchanged with 10 mL of 20% sulfuric acid aqueous solution, the solid was separated by centrifugation, and 4.0 g of acid-activated bentonite was obtained by drying.

[0022] Add the above-mentioned acid-activated bentonite to 100 g of carboxymethyl chitosan aqueous solution (the mass content of carboxymethyl chitosan is 3%), stir evenly, add 3 g of herbicide metolachlor, fully stir and mix until uniform suspension. Then use a peristaltic pump to drop into the cross-linking agent solution as described in Example 1, react at 60°C for 3 minutes to obtain a granular product, then dry at 70°C for 2 h to obtain an average particle diameter of about 0.9 mm The herbicide preparation, wherein the mass content of metolachlor is 26.5% after extraction and analysis, and the entrapment rate of metolachlor is 88.3%. Get this preparation sample 70 mg, adopt the method described in embodiment 1 to carry out release experiment, obtain the release ra...

Embodiment 3

[0024] Take 3 g of bentonite, conduct ion exchange reaction with 30 mL of cetyldimethylammonium chloride aqueous solution with a mass concentration of 2%, centrifuge to separate the solid, and dry to obtain 3.1 g of organically modified bentonite.

[0025] Prepare 100 g of carboxymethyl chitosan aqueous solution with a mass content of 4%, add the above-mentioned organically modified bentonite and 4 g of the herbicide alachlor in sequence, and stir thoroughly to form a uniform suspension. Prepare 500 mL of calcium chloride aqueous solution and glutaraldehyde aqueous solution with a mass concentration of 10%, respectively, and use them as cross-linking agents after mixing evenly. Add the above suspension into the crosslinking agent solution dropwise with a peristaltic pump, react at 50°C for 3 minutes to obtain a granular product, filter the particles, and then dry at 70°C for 2 hours to obtain an average particle size of about 1.0 mm herbicide granules. After extraction and an...

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Abstract

The invention discloses a phytocide granule and a preparation method of the granule. The preparation method is characterized by including the steps of respectively adding phytocide and bentonite in carboxymethyl chitosan solution, uniformly mixing, dropping the mixed solution in cross-linking agent solution, heating to finish surface cross-linking to obtain solid particles and drying the solid particles to obtain the granular preparation of phytocide. In application, the granule can delay the release of phytocide, reduce drug consumption, prolong action time, improve utilization rate of phytocide and control the pollution of phytocide to the environment.

Description

Technical field: [0001] The invention relates to a herbicide granule and a preparation method thereof, in particular to a herbicide granule with bentonite and carboxymethyl chitosan as carriers and a preparation method thereof. Background technique: [0002] There are many weeds in my country's farmland, and the efficiency of manual weeding is low and the cost is high, which leads to the continuous expansion of the area where chemical weeding technology is used. However, the existing herbicides are mainly in conventional formulations such as emulsifiable concentrates. After being applied to plants or soil, most of the active ingredients of herbicides will be lost with the surface runoff, or leached with the vertical movement of soil moisture, and enter the surface or groundwater system. It reduces the utilization efficiency of herbicides, and on the other hand, it brings serious environmental pollution problems. The use of slow-release technology can reasonably adjust the r...

Claims

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Application Information

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IPC IPC(8): A01N25/12A01N25/10A01P13/00
Inventor 李建法李益民吕金红
Owner SHAOXING UNIVERSITY
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