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CN-122004209-A - Diuron water dispersible granule and preparation method thereof

CN122004209ACN 122004209 ACN122004209 ACN 122004209ACN-122004209-A

Abstract

The invention discloses diuron water dispersible granules and a preparation method thereof, and belongs to the technical field of pesticide preparations. The diuron water dispersible granule comprises, by weight, 45-55 parts of diuron technical, 25-35 parts of a carrier, 6-8 parts of a stabilizer, 2-3 parts of a dispersing agent and 8-12 parts of deionized water, wherein the carrier is guanidyl silane coupling agent modified diatomite@2-hydroxy-4- (3-triethoxysilylpropoxy) benzophenone modified chitosan. The formula system realizes high efficacy and long lasting effect through functional complementation and dosage optimization of each component, and simultaneously remarkably improves the physical stability and environmental friendliness of the preparation.

Inventors

  • WANG ZHENGQIANG
  • CAI ZHANGWEI
  • XIA TIAN
  • Wang Xiashan
  • WU RUNJIN

Assignees

  • 安徽广信农化股份有限公司

Dates

Publication Date
20260512
Application Date
20260126

Claims (10)

  1. 1. The diuron water dispersible granule is characterized by comprising the following raw materials in parts by weight: 45-55 parts of diuron technical, 25-35 parts of carrier, 6-8 parts of stabilizer, 2-3 parts of dispersant and 8-12 parts of deionized water; the carrier is guanidyl silane coupling agent modified diatomite@2-hydroxy-4- (3-triethoxysilane propoxy) benzophenone modified chitosan.
  2. 2. The diuron water dispersible granule according to claim 1, wherein the preparation method of the carrier is as follows: S1, dispersing diatomite in an ethanol water solution, carrying out ultrasonic treatment for 20-40min, adding a guanidino silane coupling agent, reacting for 10-15 h at 40-50 ℃, washing with ethanol, and drying to obtain modified diatomite; S2, drying chitosan, dissolving the chitosan in 2wt% acetic acid solution, dropwise adding acetic acid to adjust the pH value of the solution to 4 to obtain solution A, dissolving 2-hydroxy-4- (3-triethoxysilylpropoxy) benzophenone in ethanol water solution to obtain solution B, mixing the solution A and the solution B under the protection of nitrogen, reacting for 2-4 hours at 50-60 ℃, then heating to 60-80 ℃ to continuously react for 0.5-1 hour, separating, washing and drying to obtain modified chitosan; s3, dissolving the modified chitosan in 1-3wt% acetic acid solution, adding the modified diatomite, stirring for 0.5-2 h, then adding 0.5-2wt% glutaraldehyde solution, reacting for 4-6 h at room temperature, adjusting pH to be neutral, and freeze-drying to obtain the carrier.
  3. 3. The diuron water dispersible granule according to claim 1, wherein in the step S1, the preparation method of the guanidino silane coupling agent comprises the following steps: dissolving 3-glycidoxypropyl triethoxysilane and arginine in anhydrous DMF, stirring and reacting for 24 hours at 60 ℃, washing and drying to obtain a guanidino silane coupling agent; The dosage ratio of the 3-glycidoxypropyl triethoxysilane, the arginine and the anhydrous DMF is 2.8g:1.7g:50mL.
  4. 4. The diuron water dispersible granule of claim 1, wherein in step S1, the diatomite, the ethanol aqueous solution and the guanidyl silane coupling agent are used in a ratio of 5 g:40-60 ml:0.5-1 g.
  5. 5. The diuron water dispersible granule of claim 1, wherein in step S1, the volume fraction of the ethanol aqueous solution is 70-90%.
  6. 6. The diuron water dispersible granule of claim 1, wherein in step S2, the dosage ratio of chitosan, acetic acid solution, 2-hydroxy-4- (3-triethoxysilylpropoxy) benzophenone, ethanol aqueous solution is 2 g:50-60 ml:0.02-0.05 g:10ml; the volume fraction of the ethanol aqueous solution is 70-90%.
  7. 7. The diuron water dispersible granule of claim 1, wherein in step S3, the dosage ratio of the modified chitosan, the acetic acid solution, the modified diatomite and the glutaraldehyde solution is 1 g:40-50 ml:1-2 g:0.5-0.6 ml.
  8. 8. The diuron water dispersible granule of claim 1, wherein the stabilizer is one or more of ethylenediamine tetraacetic acid, disodium ethylenediamine tetraacetate, and tetrasodium ethylenediamine tetraacetate.
  9. 9. The diuron water dispersible granule of claim 1, wherein the dispersing agent is one or more of sodium dodecyl benzene sulfonate, sodium lignin sulfonate, calcium lignin iodate, sodium polyoxyethylene lauryl ether sulfate and dodecyl polyoxyethylene ether phosphate.
  10. 10. A process for preparing diuron water dispersible granules as claimed in any one of claims 1 to 9, comprising the steps of: Fully mixing diuron technical, a dispersing agent, a stabilizing agent and a carrier, coarse crushing, remixing, crushing by an air flow crusher, mixing by a conical mixer, sieving by a 325-mesh standard sieve to obtain fine powder, adding deionized water, kneading, extruding, granulating, and drying at 50 ℃ to obtain diuron water dispersible granules.

Description

Diuron water dispersible granule and preparation method thereof Technical Field The invention relates to the field of pesticide preparations, in particular to diuron water dispersible granules and a preparation method thereof. Background Diuron is a high-efficiency broad-spectrum urea herbicide, has excellent preventing and killing effects on various annual and perennial weeds, and is widely applied to weed control in crop fields such as cotton, corn, sugarcane and the like. The traditional diuron preparation mainly comprises wettable powder and suspending agents, wherein the wettable powder has the problems of serious dust flying, large environmental pollution, poor wetting dispersibility and the like, the insufficient efficacy is easily caused, the health of operators is endangered, and the suspending agents have the defects of poor storage stability, high layering precipitation risk, inconvenient transportation and the like, so that the popularization and the application of the suspending agents are limited. The water dispersible granule is used as a novel environment-friendly formulation, has the advantages of no dust, good dispersibility, stable storage, safe transportation and the like, and is in line with the development trend of green pesticides. The existing diuron water dispersible granule often faces common technical problems of slow dissolution of the granule, short duration and the like. This is mainly due to the poor compatibility of conventional hydrophilic carriers with diuron, resulting in insufficient uniformity and stability of the dispersion. Therefore, development of diuron water dispersible granule capable of taking the advantages of no dust and environmental protection, quick dissolution and dispersion performance and high suspension stability into consideration has important significance for improving medication safety, drug effect reliability and environmental compatibility, and is also a direction of urgent breakthrough in the technical field of current pesticide preparations. Disclosure of Invention The invention provides diuron water dispersible granules and a preparation method thereof, which can solve the problems that diuron water dispersible granules in the prior art often face slow dissolution of granules, short lasting period and the like. The aim of the invention can be achieved by the following technical scheme: In a first aspect, the invention provides diuron water dispersible granules, which comprise the following raw materials in parts by weight: 45-55 parts of diuron technical, 25-35 parts of carrier, 6-8 parts of stabilizer, 2-3 parts of dispersant and 8-12 parts of deionized water; the carrier is guanidyl silane coupling agent modified diatomite@2-hydroxy-4- (3-triethoxysilane propoxy) benzophenone modified chitosan. Further, the preparation method of the carrier comprises the following steps: S1, dispersing diatomite in an ethanol water solution, carrying out ultrasonic treatment for 20-40min, adding a guanidino silane coupling agent, reacting for 10-15 h at 40-50 ℃, washing with ethanol, and drying to obtain modified diatomite; S2, drying chitosan, dissolving the chitosan in 2wt% acetic acid solution, dropwise adding acetic acid to adjust the pH value of the solution to 4 to obtain solution A, dissolving 2-hydroxy-4- (3-triethoxysilylpropoxy) benzophenone in ethanol water solution to obtain solution B, mixing the solution A and the solution B under the protection of nitrogen, reacting for 2-4 hours at 50-60 ℃, then heating to 60-80 ℃ to continuously react for 0.5-1 hour, separating, washing and drying to obtain modified chitosan; s3, dissolving the modified chitosan in 1-3wt% acetic acid solution, adding the modified diatomite, stirring for 0.5-2 h, then adding 0.5-2wt% glutaraldehyde solution, reacting for 4-6 h at room temperature, adjusting pH to be neutral, and freeze-drying to obtain the carrier. Further, in step S1, the preparation method of the guanidino silane coupling agent includes: Dissolving 3-glycidoxypropyl triethoxysilane and arginine in anhydrous DMF, stirring and reacting for 24 hours at 60 ℃, washing and drying to obtain the guanidino silane coupling agent. Further, the dosage ratio of the 3-glycidoxypropyl triethoxysilane, the arginine and the anhydrous DMF is 2.8g to 1.7g to 50mL. In step S1, the usage amount ratio of the diatomite, the ethanol water solution and the guanidyl silane coupling agent is 5 g:40-60 mL:0.5-1 g, and the volume fraction of the ethanol water solution is 70-90%. In step S2, the dosage ratio of the chitosan, the acetic acid solution, the 2-hydroxy-4- (3-triethoxysilylpropoxy) benzophenone and the ethanol aqueous solution is 2 g:50-60 ml:0.02-0.05 g:10ml, and the volume fraction of the ethanol aqueous solution is 70-90%. In step S3, the dosage ratio of the modified chitosan, the acetic acid solution, the modified diatomite and the glutaraldehyde solution is 1 g:40-50 ml, 1-2 g:0.5-0.6 ml. Further, the stabilizer is one or