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CN-121970772-A - Highly-suspended carbendazim wettable powder and preparation method thereof

CN121970772ACN 121970772 ACN121970772 ACN 121970772ACN-121970772-A

Abstract

The invention discloses highly-suspended carbendazim wettable powder and a preparation method thereof, and belongs to the technical field of pesticide wettable powder. The composite bactericide comprises, by weight, 40-60 parts of carbendazim, 25-45 parts of kaolin, 0.1-3 parts of a wetting agent, 1-5 parts of a dispersing agent and 0.5-3 parts of a ternary composite stabilizer. Wherein, the carbendazim is subjected to low-temperature plasma surface modification treatment, and the ternary composite stabilizer is a composite of xanthan gum, sodium alginate and silica aerogel. The preparation method comprises sequentially mixing the above materials, micronizing, and sieving. The invention improves the hydrophilicity of carbendazim through the surface modification of plasma, and remarkably improves the wettability and suspension stability of powder in water by utilizing the synergistic effect of the ternary composite stabilizer, has the advantages of high suspension rate, short wetting time, simple preparation process and the like, and is suitable for industrial production and application.

Inventors

  • WANG DAOQING
  • WANG ZHENYU
  • CHENG WEIJIA
  • LI KUN

Assignees

  • 安徽广信成辰科技有限公司

Dates

Publication Date
20260505
Application Date
20260319

Claims (10)

  1. 1. The high-suspension carbendazim wettable powder is characterized by comprising the following components in parts by weight: 40-60 parts of carbendazim, 25-45 parts of kaolin, 0.1-3 parts of wetting agent, 1-5 parts of dispersing agent and 0.5-3 parts of ternary composite stabilizer; The carbendazim is subjected to plasma surface modification treatment; the ternary composite stabilizer comprises a composite of xanthan gum, sodium alginate and silica aerogel.
  2. 2. The high-suspension carbendazim wettable powder according to claim 1, wherein the mass ratio of xanthan gum to sodium alginate to silica aerogel in the ternary composite stabilizer is 1 (0.5-1) (0.2-0.5).
  3. 3. The highly suspended carbendazim wettable powder of claim 1, wherein the wetting agent comprises sodium dodecylbenzene sulfonate, sodium dodecylsulfate.
  4. 4. The highly suspended carbendazim wettable powder of claim 1, wherein the dispersant comprises sodium methylenedinaphthyl sulfonate, sodium lignin sulfonate.
  5. 5. The highly suspended carbendazim wettable powder of claim 1, wherein the carbendazim is subjected to plasma surface modification treatment comprising the following steps: And placing the carbendazim raw material into low-temperature plasma treatment equipment, and carrying out surface modification treatment by taking argon as a protective atmosphere, wherein the plasma frequency is 40-50 Hz, the treatment voltage is 80kV, and the treatment time is 1-2 min.
  6. 6. The highly suspended carbendazim wettable powder of claim 1, wherein the ternary complex stabilizer is prepared by the following method: adding a silicon source precursor into deionized water, adding oxalic acid, adjusting the pH of the solution to 3-4, reacting for 3-4 hours at 40-50 ℃, adjusting the pH to 7-8, aging for 40-50 hours at room temperature, continuously exchanging solvents with deionized water, and freeze-drying to obtain silicon dioxide aerogel; and adding the xanthan gum, the sodium alginate and the silicon dioxide aerogel into a mixer, stirring, and uniformly mixing to obtain the ternary composite stabilizer.
  7. 7. The highly suspended carbendazim wettable powder of claim 6, wherein the silicon source precursors comprise tetraethoxysilane, methyltrimethoxysilane.
  8. 8. A process for preparing the highly suspended carbendazim wettable powder according to any one of claims 1 to 7, comprising the steps of: sequentially mixing carbendazim, kaolin, a wetting agent, a dispersing agent and a ternary composite stabilizer, and carrying out superfine grinding and sieving to obtain the high-suspension carbendazim wettable powder.
  9. 9. The preparation method of claim 8, wherein the mixing is performed in the sequence of mixing carbendazim and kaolin for 10-15 min, adding a wetting agent and a dispersing agent for 15-20 min, and finally adding a ternary composite stabilizer for 20-25 min, wherein the mixing speeds are 300-500 rpm.
  10. 10. The method of claim 8, wherein the screened mesh number is 300-400 mesh.

Description

Highly-suspended carbendazim wettable powder and preparation method thereof Technical Field The invention relates to the technical field of pesticide wettable powder, in particular to high-suspension carbendazim wettable powder and a preparation method thereof. Background Carbendazim is used as a broad-spectrum and high-efficiency benzimidazole bactericide, is widely applied to agricultural production, and has good control effect on various crop diseases caused by fungi. The wettable powder is one of the common dosage forms in pesticide processing, has the advantages of low cost, simple processing technology, convenient transportation and the like, and is especially suitable for being matched with traditional spraying equipment of farmers. However, with the continuous improvement of the pesticide application effect and the use safety requirements of agricultural production, the conventional carbendazim wettable powder has a plurality of problems in practical application, and particularly, the requirement of efficient application is difficult to meet in terms of suspension performance. The carbendazim raw material is crystalline powder, and the particle surface of the carbendazim raw material usually has stronger hydrophobicity, so that the carbendazim raw material is difficult to disperse in water and is easy to agglomerate and settle, and the uniformity and stability of suspension are further affected. In the prior art, additives are mostly added to improve the suspension performance, but the conventional additive combination has limited effect on improving the suspension rate, and especially under the condition of long-term storage or high-concentration dilution, powder is easy to agglomerate or delaminate, so that effective components are unevenly distributed in the spraying process, the pesticide effect is reduced, and the pesticide injury to crops is possibly generated. In addition, the existing preparation process has insufficient attention to the surface characteristics of the carbendazim raw material and lacks targeted modification treatment, so that the wettability and the dispersibility of the powder in actual use still have bottlenecks. Therefore, development of a highly-suspended carbendazim wettable powder and a preparation method thereof are needed to improve the dispersion stability and suspension performance of the carbendazim wettable powder in water. Disclosure of Invention The invention provides high-wettability carbendazim wettable powder, which aims to solve the problems of unstable water, difficult dispersion and easy agglomeration and sedimentation of the carbendazim wettable powder in the prior art. The invention also provides a preparation method for preparing the carbendazim wettable powder with good stability and high suspension performance. In a first aspect, the invention discloses high-suspension carbendazim wettable powder, which comprises the following components in parts by weight: 40-60 parts of carbendazim, 25-45 parts of kaolin, 0.1-3 parts of wetting agent, 1-5 parts of dispersing agent and 0.5-3 parts of ternary composite stabilizer; the carbendazim is subjected to plasma surface modification treatment; Ternary complex stabilizers include a complex of xanthan gum, sodium alginate, and silica aerogel. According to the technical scheme, the surface of the carbendazim is subjected to plasma surface modification treatment, namely active particles in high-energy plasma are utilized to bombard the surface of the carbendazim particles, and on the premise that the body structure of the carbendazim is not damaged, polar functional groups of hydroxyl and carboxyl are introduced and the surface microroughness is increased, so that the problem of high hydration resistance of the carbendazim caused by strong surface hydrophobicity can be solved, the hydrophilicity of the modified carbendazim is obviously improved, the modified carbendazim can be quickly wetted by water, and an ideal interface foundation is provided for the adsorption and anchoring of subsequent auxiliary agents. Meanwhile, the introduction of the ternary composite stabilizer constructs a dual stabilizing mechanism of particles and networks, the porous silica aerogel is closely adhered to the surfaces of carbendazim particles to form a steric hindrance layer by virtue of the high specific surface area and strong adsorptivity of the porous silica aerogel, so that agglomeration among the particles is effectively prevented, the xanthan gum and sodium alginate are taken as natural polymer chains and are combined with polar groups on the surfaces of modified particles through hydrogen bonding, and the molecular chains are mutually entangled in water to form a compact three-dimensional viscoelastic network, so that the dispersed particles are effectively captured in the network. The synergistic effect of the surface barrier and the macroscopic network enables the powder to rapidly form a highly uniform, long-term stable su