High-suspension-property carbendazim wettable powder and preparation method thereof
By modifying carbendazim with plasma surface and treating it with a ternary composite stabilizer, the problem of difficult dispersion of carbendazim wettable powder in water was solved, achieving high suspension and stability, and improving efficacy and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ANHUI GUANGXIN CHENGCHEN TECHNOLOGY CO LTD
- Filing Date
- 2026-03-19
- Publication Date
- 2026-05-05
AI Technical Summary
Existing carbendazim wettable powder is difficult to disperse in water, easily agglomerates and settles, and has poor suspension properties, which affects efficacy and safety.
By plasma surface modification of carbendazim, polar functional groups are introduced and hydrophilicity is increased. Combined with a ternary composite stabilizer (xanthan gum, sodium alginate and silica aerogel), a dual stabilization mechanism of particles and network is formed to prevent particle aggregation and sedimentation.
It significantly improves the suspension stability and uniformity of carbendazim wettable powder in water, ensuring long-term efficacy and safe use.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of wettable powder pesticides, and in particular to a highly suspended carbendazim wettable powder and its preparation method. Background Technology
[0002] Carbendazim, a broad-spectrum and highly effective benzimidazole fungicide, is widely used in agricultural production, demonstrating excellent control over various crop diseases caused by fungi. Wettable powder is a common formulation in pesticide processing, offering advantages such as low cost, simple processing, and convenient transportation, making it particularly suitable for use with traditional spraying equipment. However, with increasingly stringent requirements for pesticide efficacy and safety in agricultural production, traditional carbendazim wettable powder has revealed numerous problems in practical applications, especially in its suspension properties, which fail to meet the demands for efficient application.
[0003] Carbendazim technical grade is a crystalline powder, and its particle surface is typically highly hydrophobic, making it difficult to disperse in water and prone to agglomeration and sedimentation, thus affecting the uniformity and stability of the suspension. Current technologies often use adjuvants to improve its suspension properties, but conventional adjuvant combinations have limited effect on improving suspension rates, especially under long-term storage or high-concentration dilution conditions. The powder is prone to clumping or stratification, leading to uneven distribution of the active ingredient during spraying, which not only reduces efficacy but may also cause phytotoxicity to crops. Furthermore, current preparation processes do not adequately address the surface characteristics of carbendazim technical grade and lack targeted modification treatments, leaving the wettability and dispersibility of the powder in practical use as bottlenecks.
[0004] Therefore, there is an urgent need to develop a highly suspendable carbendazim wettable powder and its preparation method to improve the dispersion stability and suspension performance of carbendazim wettable powder in water. Summary of the Invention
[0005] This invention provides a highly wettable carbendazim wettable powder to solve the problems of instability, difficulty in dispersion, and easy agglomeration and sedimentation of carbendazim wettable powder in water in the prior art.
[0006] The present invention also provides a preparation method for preparing carbendazim wettable powder with good stability and high suspension performance.
[0007] In a first aspect, the present invention discloses a highly suspending carbendazim wettable powder, comprising the following components in parts by weight: Carbendazim 40-60 parts, kaolin 25-45 parts, wetting agent 0.1-3 parts, dispersant 1-5 parts, ternary composite stabilizer 0.5-3 parts; Carbendazim underwent plasma surface modification treatment; The ternary composite stabilizer is a complex of xanthan gum, sodium alginate, and silica aerogel.
[0008] By adopting the above technical solutions, carbendazim is first subjected to plasma surface modification treatment. This involves bombarding the surface of carbendazim particles with active particles from high-energy plasma, introducing hydroxyl and carboxyl polar functional groups and increasing surface roughness without damaging the bulk structure. This not only solves the problem of high hydration resistance caused by the strong hydrophobicity of carbendazim, but also significantly improves the hydrophilicity of the modified carbendazim, enabling it to be quickly wetted by water, providing an ideal interfacial basis for the adsorption and anchoring of subsequent adjuvants. Simultaneously, the introduction of a ternary composite stabilizer constructs a dual stabilization mechanism of particles and network. Porous silica aerogel, with its high specific surface area and strong adsorption capacity, tightly adheres to the surface of carbendazim particles, forming a steric hindrance layer that effectively prevents particle aggregation. Xanthan gum and sodium alginate, as natural polymer chains, bind to the polar groups on the surface of the modified particles through hydrogen bonding. Their molecular chains intertwine in water to form a dense three-dimensional viscoelastic network, effectively trapping dispersed particles within the network. The synergistic effect of surface barriers and macroscopic networks enables the powder to rapidly form a highly uniform and long-term stable suspension system in water.
[0009] Preferably, the mass ratio of xanthan gum, sodium alginate and silica aerogel in the ternary composite stabilizer is 1:(0.5-1):(0.2-0.5).
[0010] Preferably, the wetting agent includes sodium dodecylbenzenesulfonate and sodium dodecyl sulfate.
[0011] Preferably, the dispersant includes sodium methylene bisnaphthalene sulfonate and sodium lignin sulfonate.
[0012] Preferably, the plasma surface modification treatment of carbendazim includes the following steps: Carbendazim technical material was placed in a low-temperature plasma treatment device with argon as the protective atmosphere for surface modification treatment. The plasma frequency was 40-50 Hz, the treatment voltage was 80 kV, and the treatment time was 1-2 min.
[0013] Preferably, the ternary composite stabilizer is prepared by the following method: The silicon source precursor was added to deionized water, oxalic acid was added, the pH of the solution was adjusted to 3-4, and the reaction was carried out at 40-50℃ for 3-4 hours. Then the pH was adjusted to 7-8, and the solution was aged at room temperature for 40-50 hours. Continuous solvent exchange was carried out with deionized water, and the solution was freeze-dried to obtain silica aerogel. Xanthan gum, sodium alginate, and silica aerogel are added to a mixer and stirred until homogeneous to obtain a ternary composite stabilizer.
[0014] Preferably, the silicon source precursor includes tetraethoxysilane and methyltrimethoxysilane.
[0015] Secondly, the present invention also discloses a preparation method, comprising the following steps: Carbendazim, kaolin, wetting agent, dispersant and ternary composite stabilizer are mixed sequentially, and then ultra-finely pulverized and sieved to obtain high-suspension carbendazim wettable powder.
[0016] Preferably, the mixing sequence is as follows: first, mix carbendazim and kaolin for 10-15 minutes, then add wetting agent and dispersant and mix for 15-20 minutes, and finally add ternary composite stabilizer for 20-25 minutes, with the mixing speed being 300-500 rpm.
[0017] Preferably, the mesh size of the sieve is 300 to 400 mesh.
[0018] The beneficial effects of this invention are: 1. This invention first involves low-temperature plasma surface modification of carbendazim. This process, conducted under argon protection, introduces polar functional groups and increases microscopic roughness on the carbendazim surface, thereby enhancing its hydrophilicity. The modified carbendazim can rapidly enter the aqueous phase, providing an ideal hydrophilic interface for subsequent adjuvants. This directly promotes the rapid adsorption and firm anchoring of wetting agents and dispersants on the particle surface, significantly shortening the wetting time.
[0019] 2. This invention introduces a ternary composite stabilizer composed of xanthan gum, sodium alginate, and silica aerogel. This system forms a multi-layered synergistic effect with plasma-treated carbendazim particles. On one hand, the carbendazim particles, with increased surface energy after plasma treatment, exhibit stronger adsorption capacity for the nanoporous silica aerogel. The aerogel particles, acting as nano-anchors, are tightly attached to the carbendazim surface, forming a steric hindrance layer that effectively prevents particle aggregation due to van der Waals forces. On the other hand, xanthan gum and sodium alginate, as natural polymer chains, can form a strong bond with the polar functional groups on the modified particle surface through hydrogen bonds and other forces. One end of the polymer chain is anchored to the particle surface, while the other end extends into the aqueous phase, constructing a three-dimensional protective layer. Simultaneously, these two types of polymers intertwine in water, forming a dense three-dimensional viscoelastic network that effectively traps the surface-modified carbendazim particles within the network. Thus, this invention utilizes a dual stabilization mechanism of steric hindrance on the particle surface and three-dimensional network trapping in the aqueous phase. The surface barrier prevents micro-agglomeration, while the macro-network inhibits gravitational sedimentation. The synergistic effect of these two mechanisms enables the powder to rapidly form a highly uniform and long-term stable suspension system in water. Detailed Implementation
[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below.
[0021] A highly suspending carbendazim wettable powder comprises the following components in parts by weight: Carbendazim 40-60 parts, kaolin 25-45 parts, wetting agent 0.1-3 parts, dispersant 1-5 parts, ternary composite stabilizer 0.5-3 parts; Carbendazim underwent plasma surface modification treatment; The ternary composite stabilizer is a complex of xanthan gum, sodium alginate, and silica aerogel.
[0022] By adopting the above technical solutions, carbendazim is first subjected to plasma surface modification treatment. This involves bombarding the surface of carbendazim particles with active particles from high-energy plasma, introducing hydroxyl and carboxyl polar functional groups and increasing surface roughness without damaging the bulk structure. This not only solves the problem of high hydration resistance caused by the strong hydrophobicity of carbendazim, but also significantly improves the hydrophilicity of the modified carbendazim, enabling it to be quickly wetted by water, providing an ideal interfacial basis for the adsorption and anchoring of subsequent adjuvants. Simultaneously, the introduction of a ternary composite stabilizer constructs a dual stabilization mechanism of particles and network. Porous silica aerogel, with its high specific surface area and strong adsorption capacity, tightly adheres to the surface of carbendazim particles, forming a steric hindrance layer that effectively prevents particle aggregation. Xanthan gum and sodium alginate, as natural polymer chains, bind to the polar groups on the surface of the modified particles through hydrogen bonding. Their molecular chains intertwine in water to form a dense three-dimensional viscoelastic network, effectively trapping dispersed particles within the network. The synergistic effect of surface barriers and macroscopic networks enables the powder to rapidly form a highly uniform and long-term stable suspension system in water.
[0023] In some embodiments, the mass ratio of xanthan gum, sodium alginate, and silica aerogel in the ternary composite stabilizer is 1:(0.5-1):(0.2-0.5).
[0024] By employing the above technical solution, xanthan gum serves as the primary stabilizer, providing a high-viscosity continuous phase; sodium alginate assists in enhancing the strength and toughness of the network structure; and silica aerogel plays a role in nano-anchoring and steric hindrance. If the proportion of aerogel is too high, the system will flocculate and agglomerate; if the proportion is too low, the steric hindrance effect will be insufficient. This ratio range ensures the formation of a moderately cross-linked composite structure between the polymer network and nanoparticles, maintaining good flowability while imparting excellent suspension stability to the system.
[0025] In some embodiments, the wetting agent includes sodium dodecylbenzenesulfonate and sodium dodecyl sulfate.
[0026] In some embodiments, the dispersant includes sodium methylene bisnaphthalene sulfonate and sodium lignin sulfonate.
[0027] By adopting the above technical solution, sodium dodecylbenzenesulfonate is selected as the wetting agent, and sodium methylene bisnaphthalenesulfonate is selected as the dispersant. Sodium dodecylbenzenesulfonate, as an anionic surfactant, can rapidly reduce the surface tension of water, promoting the rapid spreading and penetration of powder particles in water. Sodium methylene bisnaphthalenesulfonate has excellent dispersing properties; the naphthalene ring in its molecular structure can strongly adsorb onto the surface of carbendazim particles, while the sulfonic acid groups extend into the aqueous phase to provide electrostatic repulsion. This complements the steric hindrance effect of the ternary composite stabilizer, further enhancing the dispersion stability of the particles in water.
[0028] In some embodiments, carbendazim undergoes plasma surface modification treatment, including the following steps: Carbendazim technical material was placed in a low-temperature plasma treatment device with argon as the protective atmosphere for surface modification treatment. The plasma frequency was 40-50 Hz, the treatment voltage was 80 kV, and the treatment time was 1-2 min.
[0029] By adopting the above technical solution, under an argon protective atmosphere, and controlling the plasma treatment frequency at 40–50 Hz, voltage at 80 kV, and time at 1–2 min, a mild and effective modification of the carbendazim surface was achieved. Argon, as an inert protective gas, avoided side reactions such as oxidative degradation; the optimization of treatment parameters ensured uniform and controllable modification effects, introducing sufficient polar functional groups to enhance hydrophilicity while avoiding the loss of active pharmaceutical ingredients due to over-treatment.
[0030] In some embodiments, the ternary composite stabilizer is prepared by the following method: The silicon source precursor was added to deionized water, oxalic acid was added, the pH of the solution was adjusted to 3-4, and the reaction was carried out at 40-50℃ for 3-4 hours. Then the pH was adjusted to 7-8, and the solution was aged at room temperature for 40-50 hours. Continuous solvent exchange was carried out with deionized water, and the solution was freeze-dried to obtain silica aerogel. Xanthan gum, sodium alginate, and silica aerogel are added to a mixer and stirred until homogeneous to obtain a ternary composite stabilizer.
[0031] Silicon source precursors include tetraethoxysilane and methyltrimethoxysilane.
[0032] By employing the above technical solutions, silica aerogels were prepared using the sol-gel method, with tetraethoxysilane or methyltrimethoxysilane selected as the silicon source precursor. Through steps such as acid-catalyzed hydrolysis, alkali-catalyzed condensation, aging, solvent exchange, and freeze-drying, an aerogel material with a nanoporous structure, high specific surface area, and low density was obtained. The freeze-drying process effectively maintained the three-dimensional network structure of the aerogel, avoiding the pore collapse caused by conventional drying.
[0033] A preparation method, comprising the following steps: Carbendazim, kaolin, wetting agent, dispersant and ternary composite stabilizer are mixed sequentially, and then ultra-finely pulverized and sieved to obtain high-suspension carbendazim wettable powder.
[0034] The mixing sequence is as follows: first, mix carbendazim and kaolin for 10-15 minutes, then add wetting agent and dispersant and mix for 15-20 minutes, and finally add ternary composite stabilizer for 20-25 minutes. The mixing speed is 300-500 rpm for all steps.
[0035] The sieve mesh size is 300-400 mesh.
[0036] By adopting the above technical solution and employing a step-by-step mixing process, carbendazim and kaolin are first premixed to ensure full contact between the carrier and the active ingredient; then, wetting agents and dispersants are added to ensure full adsorption of the adjuvants on the particle surface; finally, a ternary composite stabilizer is added to prevent polymer chain breakage due to prolonged high shear. This process fully considers the physical properties and mechanisms of action of each component, ensuring the uniform distribution of each component and the full realization of synergistic effects in the final product.
[0037] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.
[0038] Preparation Example
[0039] Preparation Example 1: A ternary composite stabilizer was prepared by the following method: 1 mL of tetraethoxysilane was added to 10 mL of deionized water. 0.1 mol / L oxalic acid solution was added while stirring to adjust the pH of the solution to 3. The reaction was carried out at 40 °C for 4 h. Then, 0.1 mol / L ammonia solution was added to adjust the pH to 7. The mixture was aged at room temperature for 48 h. Continuous solvent exchange was carried out with deionized water to completely replace the byproduct ethanol in the gel. Finally, the gel was freeze-dried to obtain silica aerogel. Add 1g xanthan gum, 0.8g sodium alginate and 0.3g silica aerogel to a mixer and stir at 500rpm for 20min until well mixed to obtain the ternary composite stabilizer.
[0040] Preparation Example 2: A binary composite stabilizer was prepared by the following method: 1 mL of tetraethoxysilane was added to 10 mL of deionized water. 0.1 mol / L oxalic acid solution was added while stirring to adjust the pH of the solution to 3. The reaction was carried out at 40 °C for 4 h. Then, 0.1 mol / L ammonia solution was added to adjust the pH to 7. The mixture was aged at room temperature for 48 h. Continuous solvent exchange was carried out with deionized water to completely replace the byproduct ethanol in the gel. Finally, the gel was freeze-dried to obtain silica aerogel. Add 1g xanthan gum and 0.3g silica aerogel to a mixer and stir at 500rpm for 20min until well mixed to obtain the ternary composite stabilizer.
[0041] Preparation Example 3: A silica aerogel was prepared by the following method: 1 mL of tetraethoxysilane was added to 10 mL of deionized water. 0.1 mol / L oxalic acid solution was added while stirring to adjust the pH of the solution to 3. The reaction was carried out at 40 °C for 4 h. Then, 0.1 mol / L ammonia solution was added to adjust the pH to 7. The mixture was aged at room temperature for 48 h. Continuous solvent exchange was performed with deionized water to completely replace the byproduct ethanol in the gel. Finally, the gel was freeze-dried to obtain silica aerogel.
[0042] Example
[0043] Example 1: A highly suspended carbendazim wettable powder was prepared by the following method: Mix 50 parts of carbendazim with 35 parts of kaolin for 10 min, then add 2 parts of sodium dodecylbenzenesulfonate and 3 parts of sodium methylene bisnaphthalenesulfonate, mix for 15 min, and finally add 2 parts of the ternary composite stabilizer prepared in Preparation Example 1 and mix for 25 min. The mixing speed is 300 rpm. After ultra-fine grinding for 12 min and passing through a 400-mesh sieve, a high-suspension carbendazim wettable powder is obtained. Carbendazim was obtained through plasma surface modification treatment, which involved treating it in a low-temperature plasma treatment device with argon as the protective gas at a frequency of 40Hz and a voltage of 80kV for 1 minute.
[0044] Example 2: A highly suspended carbendazim wettable powder was prepared by the following method: 40 parts of carbendazim and 25 parts of kaolin were mixed for 10 min, then 0.1 parts of sodium dodecylbenzenesulfonate and 1 part of sodium methylene bisnaphthalenesulfonate were added and mixed for 15 min. Finally, 0.5 parts of the ternary composite stabilizer prepared in Preparation Example 1 were added and mixed for 25 min. The mixing speed was 300 rpm. After ultra-fine grinding for 12 min and passing through a 400-mesh sieve, a high-suspension carbendazim wettable powder was obtained. Carbendazim was obtained through plasma surface modification treatment, which involved treating it in a low-temperature plasma treatment device with argon as the protective gas at a frequency of 40Hz and a voltage of 80kV for 1 minute.
[0045] Example 3: A highly suspended carbendazim wettable powder was prepared by the following method: 60 parts of carbendazim and 45 parts of kaolin were mixed for 10 min, then 3 parts of sodium dodecylbenzenesulfonate and 5 parts of sodium methylene bisnaphthalenesulfonate were added and mixed for 15 min. Finally, 3 parts of the ternary composite stabilizer prepared in Preparation Example 1 were added and mixed for 25 min. The mixing speed was 300 rpm. After ultra-fine grinding for 12 min and passing through a 400-mesh sieve, a high-suspension carbendazim wettable powder was obtained. Carbendazim was obtained through plasma surface modification treatment, which involved treating it in a low-temperature plasma treatment device with argon as the protective gas at a frequency of 40Hz and a voltage of 80kV for 1 minute.
[0046] Comparative Example
[0047] Comparative Example 1, a highly suspended carbendazim wettable powder, differs from Example 1 only in that the carbendazim is obtained by processing in a low-temperature plasma treatment device with argon as the protective gas at a frequency of 50 Hz and a voltage of 120 kV for 1 min.
[0048] Comparative Example 2, a highly suspended carbendazim wettable powder, differs from Example 1 only in that the carbendazim is not subjected to plasma surface modification treatment.
[0049] Comparative Example 3, a highly suspending carbendazim wettable powder, differs from Example 1 only in that the ternary composite stabilizer in Example 1 is replaced with the same mass of the binary composite stabilizer prepared in Preparation Example 2.
[0050] Comparative Example 4, a highly suspending carbendazim wettable powder, differs from Example 1 only in that the ternary composite stabilizer in Example 1 is replaced with silica aerogel prepared in Preparation Example 3 of the same mass.
[0051] Comparative Example 5, a highly suspending carbendazim wettable powder, differs from Example 1 only in that it does not contain a ternary composite stabilizer.
[0052] Performance testing
[0053] 1. Suspension rate test: Refer to GB / T14825 for the suspension rate test of carbendazim wettable powder; 2. Actual fungicidal effect of carbendazim wettable powder: Field experiments were conducted using carbendazim wettable powder prepared in Example 1 and Comparative Example 2. An experiment was conducted in a rapeseed field in Anhui Province to test the fungicidal effect. The rapeseed was sown in September. The experimental field was divided into three plots: Plot 1 served as a blank control group, receiving no carbendazim wettable powder treatment except for normal management during the growth process; Plot 2 was treated with carbendazim wettable powder as described in Example 1; and Plot 3 was treated with carbendazim wettable powder as described in Comparative Example 1. When the rapeseed matured, it was harvested, and diseased rapeseed was removed. The yield per mu (approximately 0.067 hectares) was calculated, and the results are shown in Table 2.
[0054] Table 1 Suspension Rate Test Results
[0055] Table 2 Yield Results per Mu
[0056] As shown in Table 1, the suspension rates of Examples 1-3 all exceeded 96%, and remained above 92% after heat storage. This is attributed to the introduction of polar functional groups on the particle surface by plasma modification, which significantly enhances hydrophilicity and allows for rapid anchoring of wetting agents and dispersants. Simultaneously, the xanthan gum and sodium alginate in the ternary composite stabilizer form a dense three-dimensional network, which, in conjunction with the nano-steric hindrance of silica aerogel, constructs a dual stabilization mechanism of surface barrier and macroscopic trapping. Comparative Example 2, lacking modification, had poor wetting properties, resulting in a suspension rate of only 76.5%. Comparative Example 3 lacked sodium alginate, leading to insufficient network strength. Comparative Example 4 lacked a polymer network, causing particles to easily settle. Comparative Example 1's high treatment voltage may have damaged the effective components, reducing its effectiveness. Table 2 further confirms from field trials that the rapeseed yield treated in Example 1 was 169 kg / mu, a 44.4% increase compared to the control, and higher than the 143 kg / mu of Comparative Example 1, fully verifying the high efficiency and stability of this invention in practical applications.
[0057] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.
Claims
1. A highly suspending carbendazim wettable powder, characterized in that, Includes the following components by weight: Carbendazim 40-60 parts, kaolin 25-45 parts, wetting agent 0.1-3 parts, dispersant 1-5 parts, ternary composite stabilizer 0.5-3 parts; The carbendazim underwent plasma surface modification treatment; The ternary composite stabilizer comprises a complex of xanthan gum, sodium alginate, and silica aerogel.
2. The highly suspending carbendazim wettable powder according to claim 1, characterized in that, The mass ratio of xanthan gum, sodium alginate, and silica aerogel in the ternary composite stabilizer is 1:(0.5-1):(0.2-0.5).
3. The highly suspending carbendazim wettable powder according to claim 1, characterized in that, The wetting agent includes sodium dodecylbenzenesulfonate and sodium dodecyl sulfate.
4. The highly suspending carbendazim wettable powder according to claim 1, characterized in that, The dispersant includes sodium methylene bisnaphthalene sulfonate and sodium lignin sulfonate.
5. The highly suspending carbendazim wettable powder according to claim 1, characterized in that, The plasma surface modification treatment of the carbendazim includes the following steps: Carbendazim technical material was placed in a low-temperature plasma treatment device with argon as the protective atmosphere for surface modification treatment. The plasma frequency was 40-50 Hz, the treatment voltage was 80 kV, and the treatment time was 1-2 min.
6. The highly suspending carbendazim wettable powder according to claim 1, characterized in that, The ternary composite stabilizer is prepared by the following method: The silicon source precursor was added to deionized water, oxalic acid was added, the pH of the solution was adjusted to 3-4, and the reaction was carried out at 40-50℃ for 3-4 hours. Then the pH was adjusted to 7-8, and the solution was aged at room temperature for 40-50 hours. Continuous solvent exchange was carried out with deionized water, and the solution was freeze-dried to obtain silica aerogel. Xanthan gum, sodium alginate, and silica aerogel are added to a mixer and stirred until homogeneous to obtain a ternary composite stabilizer.
7. The highly suspending carbendazim wettable powder according to claim 6, characterized in that, The silicon source precursors include tetraethoxysilane and methyltrimethoxysilane.
8. A method for preparing the highly suspending carbendazim wettable powder according to any one of claims 1-7, characterized in that, Includes the following steps: Carbendazim, kaolin, wetting agent, dispersant and ternary composite stabilizer are mixed sequentially, and then ultra-finely pulverized and sieved to obtain high-suspension carbendazim wettable powder.
9. The preparation method according to claim 8, characterized in that, The mixing sequence is as follows: first, mix carbendazim and kaolin for 10-15 minutes, then add wetting agent and dispersant and mix for 15-20 minutes, and finally add ternary composite stabilizer for 20-25 minutes. The mixing speed is 300-500 rpm for all of them.
10. The preparation method according to claim 8, characterized in that, The sieve mesh size is 300-400 mesh.