Light-controlled slow-release pesticide preparation and preparation method thereof

A technology of pesticide preparation and controlled release, which is applied in the field of light-controlled slow-release pesticide preparation and its preparation, can solve the problems of limiting the scope of use of controlled-release pesticides, not really having controlled release, and increasing the environmental risk of pesticides, so as to reduce The effect of spraying frequency, improving effective utilization rate, reducing manpower, material resources and financial resources cost

Active Publication Date: 2022-02-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) At present, most controlled-release pesticides only have slow-release ability, and do not really have the ability to control release under specific circumstances;
[0007] (2) At present, controlled-release pesticides mainly rely on the free diffusion of drug active ingredients, which limits the scope of use of controlled-release pesticides;
[0008] (3) Some controlled-release pesticides use inorganic ions such as nano-scale silicon dioxide and titanium dioxide as carriers. Now it is proved that inorganic nanoparticles have certain environmental toxicity. The use of such nano-controlled slow-release pesticides will increase the environmental risk of pesticides
At present, the photosensitive controlled release system is mainly used in medicine, and the research on pesticides is relatively lagging behind.

Method used

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  • Light-controlled slow-release pesticide preparation and preparation method thereof
  • Light-controlled slow-release pesticide preparation and preparation method thereof
  • Light-controlled slow-release pesticide preparation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1, preparation of photosensitive gel europium alginate

[0061] Dissolve 50 mg of sodium alginate (M=398.31) in 10 ml of ultrapure water, stir evenly, and prepare a 0.5% wt sodium alginate solution. Add 0.5%wt sodium alginate solution dropwise to 30ml 0.01M europium chloride (M=366.32) aqueous solution, each drop will cause the surface of sodium alginate solution to instantly solidify in the europium chloride solution, and will react instantaneously to form a diameter 3 The colloidal particles between -4mm and spherical and uniform inside and outside, the dropwise addition is completed in about 20 minutes, after the dropping is completed, let stand at room temperature (20-25°C) for 8 hours, then filter the colloidal particles and soak them in ultrapure water for 24 hours to make the colloidal particles Internal and external europium ion balance.

[0062] Observation of photosensitive properties of europium alginate gel:

[0063] An appropriate amount of the...

Embodiment 2

[0069] Example 2: Preparation of photosensitive thiazole zinc microspheres

[0070] 1) Synthesis of nano-thiazole zinc original drug

[0071] Synthesis of intermediate thiadiazole sodium salt

[0072] Weigh 3g (75mmol) of sodium hydroxide and add it to 100ml of water, stir until it is completely dissolved, add 10g (75mmol) of thiadiazole, stir evenly, the system is white and turbid, heat up and reflux until the system changes from white turbidity to wine red and transparent, reflux 2h, naturally cooled to room temperature to obtain thiadiazole sodium salt solution.

[0073] Dissolve 10.78g (37.5mmol) of zinc sulfate heptahydrate in 100ml of water at room temperature, add 50mg of dispersant sodium naphthalenesulfonic acid formaldehyde condensate, stir, slowly add the thiadiazole sodium salt solution obtained in the above steps, and Stir for 20 min to obtain a white emulsion. The white emulsion was centrifuged at 10000r / min for 10-20min, and the precipitate was washed twice w...

Embodiment 3

[0078] Embodiment 3, preparation of photosensitive azoxystrobin microspheres:

[0079] Dissolve 50 mg of azoxystrobin in 10 ml of acetone, mix the obtained azoxystrobin acetone solution with 10 ml of 1% wt sodium alginate aqueous solution using magnetic stirring, and stir in a water bath at 60°C until the acetone is completely volatilized to obtain milky white azoxystrobin A mixed solution of strobilurin and sodium alginate. Take out 2ml of the obtained mixed solution and add dropwise (20min to complete) into 30ml of 0.01M europium chloride aqueous solution to prepare drug-containing microspheres with a diameter of 4mm. Place them at room temperature for 8 hours to make the microspheres fully react, and then place the microspheres The balls were immersed in ultrapure water for 24 hours, and the ultrapure water was replaced three times midway to obtain about 2.1 g of photosensitive thiazole zinc microspheres.

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PUM

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Abstract

The invention discloses a light-controlled slow-release pesticide preparation, which uses the photosensitive carrier europium alginate microspheres as the carrier, and uses the pesticide embedded and / or embedded in the carrier as the active ingredient; in the preparation, the pesticide used as the active ingredient The weight content is 5-95%; the preparation is in the form of porous nanoparticles with a particle diameter of 50-1000nm; the pesticide is a conventional chemical pesticide, or a bionic pesticide, a biological pesticide, or an insect pheromone. The present invention also provides a preparation method of the above light-controlled slow-release pesticide preparation.

Description

technical field [0001] The invention relates to a light-controlled slow-release pesticide preparation and a preparation method thereof. Background technique [0002] Pesticides are important means of agricultural production. For a long time, the development and application of chemical pesticides have played an irreplaceable role in timely and effective control of pesticide pests and diseases, and in ensuring high and increased yields of agricultural products, which has greatly promoted the development of agriculture. However, during the spraying process, pesticides are easily lost to the environment with the erosion of rainwater, resulting in short duration of pesticides and low effective utilization rate. The active ingredients of pesticides in the environment are easily degraded, which affects the control effect. In order to achieve a good control effect, pesticides must be sprayed many times and in large quantities, which consumes a lot of manpower, material resources and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/28A01N25/10A01N43/824A01N43/54A01N47/38A01P3/00A01P1/00A01P7/04
CPCA01N25/10A01N25/28A01N43/54A01N43/82A01N47/38
Inventor 程敬丽赵金浩程城肖豆鑫李中珊朱国念
Owner ZHEJIANG UNIV
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