Preparation method of pesticide granules for preventing and controlling underground pests and diseases and carrier thereof

Abstract

The present invention relates to a method for preparing a pesticide granule and a carrier for preventing and controlling underground pests and diseases, belonging to the technical field of pesticides. The method comprises a pesticide granule and a pesticide carrier, wherein the pesticide granule is adsorbed on the pesticide carrier, and the mass of the pesticide granule is 10-25% of the mass of the pesticide carrier; the pesticide granule is an insecticide and / or a fungicide; and the pesticide carrier is prepared from cement, fly ash, white carbon black, and fine aggregate, and is a spherical microporous carrier with a diameter of 2-4 mm. The pesticide granule prepared by the present invention has good stability, is not easily degraded by the active ingredient, has good fluidity, good mixing uniformity with fertilizers, is convenient for simultaneous sowing, and has positive significance for agricultural modernization. The prepared pesticide carrier has a spherical microporous structure, has a large adsorption capacity for the pesticide, has high mechanical strength and good wear resistance, and is not easily powdered or slag-shed. The method improves the use efficiency of the pesticide, enhances the efficacy of the pesticide, and reduces the pollution to the environment caused by the use of the pesticide.

Description

Technical Field

[0001] The invention relates to a pesticide granule for preventing and controlling underground pests and diseases and a preparation method of a carrier thereof, belonging to the technical field of pesticides. Background Art

[0002] Pesticide granules utilize the high adsorption capacity of minerals to adsorb a specific amount of the active ingredient. In addition to high adsorption, the pesticide carrier used must also exhibit sustained-release properties, promote drug stability, have good flowability, facilitate production, be environmentally friendly, and be widely available and cost-effective. Currently, most pesticide carriers used in granules are sintered products made from sand, brick sand, or mineral soil. However, these carriers have a high rate of drug decomposition during thermal storage and are often non-spherical.

[0003] With the trend toward lighter labor in agriculture, seed drills are increasingly used. Subterranean pest control drugs are often applied together with spherical fertilizer granules, which are then spread into the soil using seed drills. This places specific demands on the shape of the pesticide carrier: it must possess a certain degree of fluidity to mix well with the fertilizer, be stable and resist decomposition of the active ingredient, and possess sufficient mechanical strength, good abrasion resistance, and minimal shedding when mixed with the original drug during processing. Existing spherical carriers are mostly sintered products made from mineral soil, resulting in extremely poor thermal storage stability. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for preparing a pesticide granule for preventing and controlling underground pests and diseases and a carrier thereof, so as to solve the above problems.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A pesticide granule for controlling underground pests and diseases comprises a pesticide technical and a pesticide carrier, wherein the pesticide technical is adsorbed on the pesticide carrier, and the mass of the pesticide technical is 10-25% of that of the pesticide carrier; the pesticide technical is an insecticide and / or a fungicide; and the pesticide carrier is prepared from cement, fly ash, white carbon black, and fine aggregate, and is a spherical microporous carrier with a diameter of 2-4 mm.

[0007] A further improvement of the technical solution of the present invention is that the pesticide technical is one or more of thiazolin, chlorpyrifos, clothianidin, thiamethoxam, avermectin, avermectin B2, avermectin B2 derivatives, emamectin benzoate, emamectin B2 benzoate, emamectin B2 benzoate derivatives, fluopyram, metaldehyde, metalaxyl-M, azoxystrobin, benomyl, propamocarb, metalaxyl and dioxazolidinone.

[0008] The further improvement of the technical solution of the present invention is that: the cement is 200-300 mesh; the fly ash is ash particles collected after burning coal powder, and the ash particles are 60-180 mesh; the white carbon black is obtained by precipitation method, and the fine aggregate is 80-100 mesh fine sand.

[0009] A further improvement of the technical solution of the present invention is that the mass ratio of the cement, fly ash, white carbon black and fine aggregate is 2:4-6:1:3-1.

[0010] A method for preparing a pesticide carrier comprises the following steps:

[0011] S1. Weigh the raw materials in proportion, then put them into the spheronizer and stir to mix;

[0012] S2. After mixing evenly, spray water into the spheronizer to make the mixed raw materials stick together into balls;

[0013] S3. Dry the spheres obtained in S2 at a certain temperature until the moisture content is below 1%, and select spherical carriers with a diameter of 2 to 4 mm through screening.

[0014] A further improvement of the technical solution of the present invention is that the mass ratio of water to mixed raw materials in S2 is 1:48-52.

[0015] A further improvement of the technical solution of the present invention is that the drying temperature of S3 is 90-100°C.

[0016] Due to the adoption of the above technical solution, the technical effects achieved by the present invention are as follows:

[0017] The pesticide granules prepared by the invention have good stability, are not easy to degrade, have good fluidity, are well mixed with chemical fertilizers, are convenient for simultaneous sowing, and have positive significance for agricultural modernization.

[0018] The pesticide carrier prepared by the present invention has a spherical microporous structure, has a large adsorption capacity for pesticides, has high mechanical strength and good wear resistance, and is not easy to fall into powder or residue. It improves the use efficiency of pesticides, enhances the efficacy of pesticides, and reduces the pollution to the environment caused by the use of pesticides. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an enlarged image of the pesticide carrier of the present invention;

[0020] Figure 2 is an image of the pesticide carrier of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] Example 1

[0023] The 20% thiazolyl granules comprise thiazolyl and a pesticide carrier, wherein the thiazolyl is adsorbed on the pesticide carrier, and the mass of the thiazolyl is 25% of the mass of the pesticide carrier.

[0024] The preparation method of the pesticide carrier is:

[0025] S1. Weigh 20g of 200-300 mesh fine cement, 40g of 60-180 mesh fly ash, 30g of 80-100 mesh fine aggregate and 10g of white carbon black and stir and mix them in a spheronizer;

[0026] S2. After mixing evenly, spray water into the spheronizer to make the mixed raw materials stick together into balls. The mass ratio of water to material is 1:50.

[0027] S3, drying the spheres obtained in S2 at 100°C to a moisture content of 0.8%, and screening to obtain spherical carriers with a diameter of 2 to 4 mm, wherein the spherical carriers have micropores, such as Figure 1 、 2 shown.

[0028] 20 g of thiazolyl and 80 g of a pesticide carrier were weighed, and the thiazolyl technical and the pesticide carrier were mixed and adsorbed to obtain 20% thiazolyl granules.

[0029] Example 2

[0030] The 10% metalaxyl-M·azoxystrobin granules comprise metalaxyl-M, azoxystrobin and a pesticide carrier, wherein the metalaxyl-M and azoxystrobin are adsorbed on the pesticide carrier, and the total mass of the metalaxyl-M and azoxystrobin is one ninth of the mass of the pesticide carrier.

[0031] The preparation method of the pesticide carrier is:

[0032] S1. Weigh 20g of 200-300 mesh fine cement, 50g of 60-180 mesh fly ash, 20g of 80-100 mesh fine aggregate and 10g of white carbon black and stir and mix them in a spheronizer;

[0033] S2. After mixing evenly, spray water into the spheronizer to make the mixed raw materials stick together into balls. The mass ratio of water to material is 1:52.

[0034] S3. Dry the spheres obtained in S2 at 100° C. to a moisture content of 0.6%, and select spherical carriers with a diameter of 2 to 4 mm through screening. The spherical carriers have micropores.

[0035] 5 g of metalaxyl-M, 5 g of azoxystrobin and 90 g of a pesticide carrier were weighed, and the metalaxyl-M, azoxystrobin and the pesticide carrier were mixed and adsorbed to obtain 10% metalaxyl-M·azoxystrobin granules.

[0036] Example 3

[0037] The 15% chlorpyrifos·clothianidin granules comprise chlorpyrifos, clothianidin and a pesticide carrier, wherein the chlorpyrifos and clothianidin are adsorbed on the pesticide carrier, and the total mass of the chlorpyrifos and clothianidin accounts for 17.65% of the mass of the pesticide carrier.

[0038] The preparation method of the pesticide carrier is:

[0039] S1. Weigh 20g of 200-300 mesh fine cement, 60g of 60-180 mesh fly ash, 10g of 80-100 mesh fine aggregate and 10g of white carbon black and stir and mix them in a spheronizer;

[0040] S2. After mixing evenly, spray water into the spheronizer to make the mixed raw materials stick together into balls. The mass ratio of water to material is 1:49.

[0041] S3. Dry the spheres obtained in S2 at 95° C. to a moisture content of 0.7%, and select spherical carriers with a diameter of 2 to 4 mm through screening. The spherical carriers have micropores.

[0042] 10 g of chlorpyrifos, 5 g of clothianidin and 85 g of a pesticide carrier were weighed, and the chlorpyrifos and clothianidin were mixed with the pesticide carrier for adsorption to obtain 15% chlorpyrifos·clothianidin granules.

[0043] Comparative Example 1

[0044] The difference from Example 1 is:

[0045] The 10% thiazolyl granules comprise thiazolyl and a pesticide carrier, wherein the thiazolyl is adsorbed on the pesticide carrier, and the mass of the thiazolyl is one ninth of the mass of the pesticide carrier.

[0046] S1. Weigh 20g of 200-300 mesh fine cement, 40g of 60-180 mesh fly ash and 40g of 80-100 mesh fine aggregate and stir and mix them in a spheronizer.

[0047] 10 g of thiazolyl and 90 g of a pesticide carrier were weighed, and the thiazolyl technical and the pesticide carrier were mixed and adsorbed to obtain 10% thiazolyl granules.

[0048] Comparative Example 2

[0049] The difference from Example 1 is:

[0050] The 10% thiazolyl granules comprise thiazolyl and a pesticide carrier, wherein the thiazolyl is adsorbed on the pesticide carrier, and the mass of the thiazolyl is one ninth of the mass of the pesticide carrier.

[0051] S1. Weigh 20g of 200-300 mesh fine cement, 70g of 80-100 mesh fine aggregate and 10g of white carbon black and stir and mix them in a spheronizer.

[0052] 10 g of thiazolyl and 90 g of a pesticide carrier were weighed, and the thiazolyl technical and the pesticide carrier were mixed and adsorbed to obtain 10% thiazolyl granules.

[0053] Comparative Example 3

[0054] The difference from Example 1 is:

[0055] The 10% thiazolyl granules comprise thiazolyl and a pesticide carrier, wherein the thiazolyl is adsorbed on the pesticide carrier, and the mass of the thiazolyl is one ninth of the mass of the pesticide carrier.

[0056] S1. Weigh 20 g of 200-300 mesh fine cement, 40 g of 60-180 mesh fly ash, 30 g of 80-100 mesh clay, and 10 g of white carbon black and stir and mix them in a spheronizer.

[0057] 10 g of thiazolyl and 90 g of a pesticide carrier were weighed, and the thiazolyl technical and the pesticide carrier were mixed and adsorbed to obtain 10% thiazolyl granules.

[0058] Comparative Example 4

[0059] The difference from Example 1 is:

[0060] The 10% thiazolyl granules comprise thiazolyl and a pesticide carrier, wherein the thiazolyl is adsorbed on the pesticide carrier, and the mass of the thiazolyl is one ninth of the mass of the pesticide carrier.

[0061] S1. Weigh 20g of 200-300 mesh fine cement, 40g of 500-800 mesh fly ash, 30g of 80-100 mesh fine aggregate and 10g of white carbon black and stir and mix them in a spheronizer.

[0062] 10 g of thiazolyl and 90 g of a pesticide carrier were weighed, and the thiazolyl technical and the pesticide carrier were mixed and adsorbed to obtain 10% thiazolyl granules.

[0063] 1. Pesticide carrier performance test

[0064] Pesticide adsorption tests were conducted on the pesticide carriers prepared in Examples 1-3 and Comparative Examples 1-4. The liquid active drug component and the carrier were stirred and mixed. Absorption was complete when the drug carrier completely absorbed the drug solution and the surface was dry and non-sticky. The absorption amount (mass of liquid active drug component to mass of pesticide carrier) and absorption time for each example and comparative example are shown in the table below:

[0065]

[0066] 2. Pesticide Stability Test

[0067] The pesticide granules prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were respectively subjected to pesticide stability tests.

[0068] The completely adsorbed, surface-dry product is packaged and stored at 55±2°C for 14 days as hot storage, or at -2±2°C for 14 days as cold storage. After the expiration date, the sample is tested for active ingredient content using a liquid chromatograph. The difference between the hot and cold storage contents and the cold storage content is the decomposition rate. The hot and cold storage decomposition rate of qualified products shall not exceed 5%. The decomposition rates of the embodiments and comparative examples are shown in the following table:

[0069]

Claims

1. A pesticide granule for preventing and controlling underground pests and diseases, characterized by: The invention comprises a pesticide technical and a pesticide carrier, wherein the pesticide technical is adsorbed on the pesticide carrier, and the mass of the pesticide technical is 10-25% of the mass of the pesticide carrier; the pesticide technical is an insecticide and / or a fungicide; the pesticide carrier is prepared from 200-300 mesh fine cement, 60-180 mesh fly ash, white carbon black and 80-100 mesh fine aggregate, and is a spherical microporous carrier with a diameter of 2-4 mm. The preparation method of the pesticide carrier comprises the following steps: S1. Weigh the raw materials in proportion, then put them into the spheronizer and stir to mix; S2. After mixing evenly, spray water into the spheronizer to make the mixed raw materials stick together into balls; S3. Dry the spheres obtained in S2 at a certain temperature until the moisture content is below 1%, and select spherical carriers with a diameter of 2 to 4 mm through screening.

2. The pesticide granule for controlling underground pests and diseases according to claim 1, characterized in that: The pesticide technical is one or more of thiazolin, chlorpyrifos, clothianidin, thiamethoxam, avermectin, avermectin B2 derivatives, emamectin benzoate, emamectin B2 benzoate derivatives, fluopyram, metaldehyde, metalaxyl-M, azoxystrobin, benomyl, propamocarb, metalaxyl and dioxazolidinone.

3. The pesticide granules for controlling underground pests and diseases according to claim 1, characterized in that: The fly ash is ash particles collected after burning coal powder, the white carbon black is prepared by precipitation method, and the fine aggregate is 80-100 mesh fine sand.

4. The pesticide granules for controlling underground pests and diseases according to claim 3, characterized in that: The mass ratio of the fine cement, fly ash, white carbon black and fine aggregate is 2:4-6:1:3-1.

5. The pesticide granules for controlling underground pests and diseases according to claim 1, characterized in that: The mass ratio of water to mixed raw materials in S2 is 1:48-52.

6. The pesticide granules for controlling underground pests and diseases according to claim 1, characterized in that: The drying temperature of S3 is 90-100°C.

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