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CN-121970762-A - Herbicide and preparation method and application thereof

CN121970762ACN 121970762 ACN121970762 ACN 121970762ACN-121970762-A

Abstract

The invention relates to the technical field of herbicides, in particular to a herbicide and a preparation method and application thereof, wherein the herbicide comprises the following components, by weight, 10-20% of benzothiazole derivatives, 1-20% of auxiliary active ingredients, 1-5% of synergists, 0.1-30% of accelerators, 30-70% of carriers and 5-15% of surface active auxiliary agents, and the sum of mass fractions of the components is 100%, wherein the benzothiazole derivatives are 2-hydroxy-5-methoxy-N-methylbenzothiazole or agriculturally acceptable salts thereof, and the auxiliary active ingredients comprise one or more of 2, 4-dichlorophenoxyacetic acid, p-nitrobenzaldehyde and acetonylacetone. The herbicide provided by the invention takes the benzothiazole derivative as a main active ingredient, and can realize high-efficiency control under the condition of low dosage by being matched with auxiliary active ingredients, and the addition of the synergistic agent and the accelerator is beneficial to wetting, permeation and systemic conduction of the active ingredients on weed blades, so that the efficacy onset speed is improved and the duration is prolonged.

Inventors

  • SUN JIALE

Assignees

  • 上海群力化工有限公司

Dates

Publication Date
20260505
Application Date
20260326

Claims (10)

  1. 1. The herbicide is characterized by comprising the following components in percentage by mass: 10-20wt% of benzothiazole derivative, 1-20wt% of auxiliary active ingredient, 1-5wt% of synergistic agent, 0.1-30wt% of accelerator, 30-70wt% of carrier and 5-15wt% of surface active auxiliary agent, wherein the sum of mass fractions of the components is 100wt%; Wherein the benzothiazole derivative is 2-hydroxy-5-methoxy-N-methylbenzothiazole or agriculturally acceptable salts thereof, and the auxiliary active ingredient comprises one or more of 2, 4-dichlorophenoxyacetic acid, p-nitrobenzaldehyde and acetonylacetone.
  2. 2. The herbicide according to claim 1, characterized in that the agriculturally acceptable salt is a hydrochloride, sulfate or acetate salt and/or, The mass ratio of the benzothiazole derivative to the auxiliary active ingredient is 1 (0.1-1).
  3. 3. The herbicide of claim 1, wherein the synergistic agent comprises cyclic hexapeptide Cyclo (-Gly-Ala-Leu-Val-Pro-Phe) or acetate thereof, the surface active auxiliary agent comprises one or more of nonionic surfactant, anionic surfactant and cationic surfactant, wherein the nonionic surfactant is fatty alcohol polyoxyethylene ether, the anionic surfactant is sodium dodecyl benzene sulfonate, and the cationic surfactant is cetyl trimethyl ammonium bromide; Preferably, the mass fraction of the synergistic agent is 1-2wt%.
  4. 4. The herbicide according to claim 1, characterized in that the accelerator comprises caprylic/capric acid mixed ester and polyethylene glycol, the mass ratio of caprylic acid to capric acid in the caprylic/capric acid mixed ester is 1:1, the number average molecular weight of the polyethylene glycol is 300-600, and the mass ratio of the caprylic/capric acid mixed ester to the polyethylene glycol is (3-7): 1.
  5. 5. A process for the preparation of a herbicide, wherein the process is suitable for use with the herbicide of any one of claims 1-4, the process comprising: S1, dissolving the benzothiazole derivative in a first part of the carrier to obtain a first solution; s2, dissolving the auxiliary active ingredient in a second part of the carrier to obtain a second solution; S3, mixing the first solution and the second solution to obtain a third solution; s4, sequentially adding a synergistic agent and an accelerator into the third solution to obtain a fourth solution; S5, adding a third part of the carrier and a surface active auxiliary agent into the fourth solution to emulsify, so as to obtain a fifth solution; and S6, adjusting the acid-base property of the fifth solution to a preset pH value to obtain the herbicide.
  6. 6. The method for preparing a herbicide according to claim 5, wherein step S1 comprises adding the benzothiazole derivative to a first portion of the carrier at 20-60 ℃ and stirring at a speed of 300-500rpm for 10-20min to obtain the first solution, wherein the mass concentration of the benzothiazole derivative in the first solution is 40-80wt%; Step S2 specifically comprises adding the auxiliary active ingredient into the second part of the carrier at 20-50 ℃, stirring and dissolving at a speed of 300-500rpm for 10-15min to obtain the second solution, wherein the mass concentration of the auxiliary active ingredient in the second solution is 6-60wt%.
  7. 7. The method of preparing a herbicide according to claim 5, wherein step S3 comprises the steps of slowly dripping the second solution into the first solution at a constant temperature of 25-35 ℃ at a speed of 1-2mL/min while stirring at a speed of 200-600rpm, and continuing stirring for 10-15min after the dripping is completed to obtain the third solution; Step S4 specifically comprises adding the synergistic agent into the third solution, stirring and dispersing at 400-600rpm for 5-20 min, adding the accelerator, and continuing stirring and dispersing at 400-600rpm for 5-20 min to obtain the fourth solution.
  8. 8. The method of preparing a herbicide according to claim 5, wherein step S5 comprises adding the surfactant to the third part of the carrier, stirring at a speed of 300-500rpm for 10-15min, adding the fourth solution to the carrier containing the surfactant at a speed of 1-3mL/min under stirring, and emulsifying at a high shear speed of 1000-3000rpm for 5-15 min and a particle size of the emulsified system of 1-10 μm to obtain the fifth solution.
  9. 9. The method for preparing a herbicide according to claim 5, wherein step S6 comprises the steps of adding an acidic regulator or an alkaline regulator to adjust the pH of the fifth solution to 5-7, stirring at a speed of 300-500rpm for 10-30 minutes under a condition of 25-40 ℃ after the adjustment, and standing and cooling to 20-25 ℃ to obtain the herbicide; Wherein the acid regulator is hydrochloric acid or acetic acid, and the alkaline regulator is sodium hydroxide or sodium carbonate.
  10. 10. Use of the herbicide according to any one of claims 1 to 4 or the herbicide prepared by the method for preparing the herbicide according to any one of claims 5 to 9 for weed control.

Description

Herbicide and preparation method and application thereof Technical Field The invention relates to the technical field of herbicides, in particular to a herbicide and a preparation method and application thereof. Background Weeds and crops have strong competition in water, nutrient, illumination and other aspects, and are one of main biotic stress factors which lead to crop yield reduction and quality reduction. Chemical weeding is the most common weed control means in modern agriculture because of high efficiency, controllable cost and wide application range. However, long-term and single-mechanism herbicide use is easy to induce weeds to generate resistance, and part of the preparation still has the defects in terms of environmental compatibility, selective safety, application stability and the like, so that development of a high-efficiency low-toxicity herbicide preparation with a novel structure or a compound synergistic effect is needed. In the prior art, benzothiazole compounds are paid attention to in the field of pesticides because of good biological activity, but when the benzothiazole compounds are independently applied, the problems of limited action spectrum, unstable prevention effect on specific weeds, high application dosage and the like often exist. Disclosure of Invention Object of the invention The invention aims to provide a herbicide, a preparation method and application thereof, and the herbicide is used for enhancing the weeding effect of benzothiazole derivatives through auxiliary active ingredients, so that low dosage and high efficiency are realized. (II) technical scheme In order to solve the problems, the invention provides a herbicide, which comprises the following components in percentage by mass: 10-20wt% of benzothiazole derivative, 1-20wt% of auxiliary active ingredient, 1-5wt% of synergistic agent, 0.1-30wt% of accelerator, 30-70wt% of carrier and 5-15wt% of surface active auxiliary agent, wherein the sum of mass fractions of the components is 100wt%; Wherein the benzothiazole derivative is 2-hydroxy-5-methoxy-N-methylbenzothiazole or agriculturally acceptable salts thereof, and the auxiliary active ingredient comprises one or more of 2, 4-dichlorophenoxyacetic acid, p-nitrobenzaldehyde and acetonylacetone. In another aspect of the invention, preferably, the agriculturally acceptable salt is a hydrochloride, sulfate or acetate salt, and/or, The mass ratio of the benzothiazole derivative to the auxiliary active ingredient is 1 (0.1-1). In another aspect of the invention, preferably, the synergistic agent comprises cyclic hexapeptide Cyclo (-Gly-Ala-Leu-Val-Pro-Phe) or acetate thereof, the surface active auxiliary agent comprises one or more of nonionic surfactant, anionic surfactant and cationic surfactant, wherein the nonionic surfactant is fatty alcohol polyoxyethylene ether, the anionic surfactant is sodium dodecyl benzene sulfonate, and the cationic surfactant is cetyl trimethyl ammonium bromide; Preferably, the mass fraction of the synergistic agent is 1-2wt%. In another aspect of the present invention, preferably, the accelerator comprises caprylic acid/capric acid mixed ester and polyethylene glycol, wherein the mass ratio of caprylic acid to capric acid in the caprylic acid/capric acid mixed ester is 1:1, the number average molecular weight of the polyethylene glycol is 300-600, and the mass ratio of the caprylic acid/capric acid mixed ester to the polyethylene glycol is (3-7): 1. In another aspect of the present invention, preferably, a method for producing a herbicide, which is suitable for use as the herbicide described above, comprises: S1, dissolving the benzothiazole derivative in a first part of the carrier to obtain a first solution; s2, dissolving the auxiliary active ingredient in a second part of the carrier to obtain a second solution; S3, mixing the first solution and the second solution to obtain a third solution; s4, sequentially adding a synergistic agent and an accelerator into the third solution to obtain a fourth solution; S5, adding a third part of the carrier and a surface active auxiliary agent into the fourth solution to emulsify, so as to obtain a fifth solution; and S6, adjusting the acid-base property of the fifth solution to a preset pH value to obtain the herbicide. In another aspect of the present invention, it is preferable that step S1 specifically comprises adding the benzothiazole derivative to the first portion of the carrier at 20-60 ℃ and stirring at 300-500rpm for 10-20min to obtain the first solution, wherein the mass concentration of the benzothiazole derivative in the first solution is 40-80wt%; Step S2 specifically comprises adding the auxiliary active ingredient into the second part of the carrier at 20-50 ℃, stirring and dissolving at a speed of 300-500rpm for 10-15min to obtain the second solution, wherein the mass concentration of the auxiliary active ingredient in the second solution is 6-60wt%. In another aspect of the pre