Formula and production method of pesticide suspending agent containing thickening agent

Abstract

The invention relates to the technical field of pesticide preparations, and discloses a pesticide suspending agent formula containing a thickening agent and a production method of the pesticide suspending agent formula. 22%-26% of atrazine; 3%-5% of fatty alcohol-polyoxyethylene ether; 5%-7% of a polycarboxylate dispersant; 2%-4% of sodium lignin sulfonate; 0.9%-1.8% of magnesium aluminum silicate; 3%-6% of ethylene glycol; 1.5% to 2.5% of sorbitol; 0.1%-0.3% of sodium benzoate; 0.8%-1.6% of borax; 0.1%-0.4% of a defoaming agent; 0.3%-0.6% of a thickening agent; a composite dispersion system with a polycarboxylate dispersing agent as a main component and sodium lignin sulfonate as an auxiliary component is constructed and cooperates with a thickening suspension system compounded by optimized xanthan gum and aluminum-magnesium silicate, so that the prepared pesticide suspending agent can achieve multiple stable effects from electrostatic repulsion and steric hindrance to three-dimensional network physical barrier; therefore, the long-term suspension stability of the pesticide suspending agent finished product is improved, and the phenomena of sedimentation, water separation and caking in the storage process are effectively prevented.

Description

Technical Field

[0001] This invention relates to the field of pesticide formulation technology, specifically to a pesticide suspension formulation containing a thickener and its production method. Background Technology

[0002] Suspension concentrates (SCs), as an environmentally friendly water-based pesticide formulation, are highly favored due to their dust-free nature, safe application, and high bioactivity. The core challenge lies in ensuring that the solid active ingredients can remain stably suspended in water for extended periods, without settling, clumping, or crystallizing.

[0003] In existing technologies, the formulation and production of pesticide suspension concentrates largely rely on empirical exploration. Common shortcomings include: First, the formulation system design is crude, often using a single or simple combination of wetting and dispersing agents, which is insufficient in coating the particle surface and steric hindrance, leading to particle agglomeration, increased particle size, and a sharp decrease in suspension rate after long-term storage, even forming hard precipitates that cannot be redispersed; second, the production process is not precisely controlled, with insufficient pre-dispersion or excessively wide particle size distribution from wet milling, directly affecting the physical stability of the final product; third, in pursuit of stability, excessive use of thickeners is often used, resulting in excessively high product viscosity and poor pourability, dilution, and spray performance. In addition, the lack of strict control over the physicochemical properties of key raw materials (such as technical grade pesticides) also affects batch-to-batch stability and reproducibility.

[0004] Therefore, developing a pesticide suspension concentrate with a scientifically formulated, controllable process that can balance high suspension stability and excellent performance, as well as its production method, is of great practical significance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a pesticide suspension formulation containing a thickener and its production method, which has the advantages of significant synergistic effect of the formulation, precise and controllable production process, and excellent comprehensive product performance. It solves the problems of traditional suspensions being prone to sedimentation and clumping, having poor long-term storage stability, and being difficult to balance performance and ease of use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pesticide suspension formulation containing a thickener, wherein the pesticide suspension formulation has the following mass ratio: pyraclostrobin 8%-12%; atrazine 22%-26%; fatty alcohol polyoxyethylene ether 3%-5%; polycarboxylate dispersant 5%-7%; sodium lignosulfonate 2%-4%; magnesium aluminum silicate 0.9%-1.8%; ethylene glycol 3%-6%; sorbitol 1.5%-2.5%; sodium benzoate 0.1%-0.3%; borax 0.8%-1.6%; defoamer 0.1%-0.4%; thickener 0.3%-0.6%; and the remaining component is deionized water.

[0007] Preferably, the pyraclostrobin is the technical grade, with an active ingredient content ≥96.6%, acidity ≤0.25%, moisture ≤0.4%, and acetone-insoluble matter ≤0.4%; the atrazine is the technical grade, with an active ingredient content ≥97%, moisture ≤0.8%, and pH value range of 6.0-8.0.

[0008] Preferably, the defoamer is selected from one of polyether-modified silicone oil, organosilicon paste defoamer, fatty alcohol defoamer, or mineral oil-based defoamer.

[0009] Preferably, the thickener is selected from one or two of xanthan gum, magnesium aluminum silicate, sodium carboxymethyl cellulose, or polyvinyl alcohol.

[0010] Preferably, a method for producing a pesticide suspension containing a thickener includes the following steps: Step 1: Raw material formulation design: Prepare the following raw materials by mass ratio according to the designed formulation: pyraclostrobin, atrazine, fatty alcohol polyoxyethylene ether, polycarboxylate dispersant, sodium lignosulfonate, magnesium aluminum silicate, ethylene glycol, sorbitol, sodium benzoate, borax, defoamer, thickener, and deionized water, for later use. Step 2, Pre-dispersion mixing: The active ingredients, dispersant, wetting agent and deionized water are initially mixed to form a pre-dispersion slurry; Step 3, wet grinding: The pre-dispersed slurry is subjected to wet circulating grinding to make the particle size reach the predetermined standard, and the qualified slurry is then used for the next step of formulation. Step 4, Blending and Thickening: Add defoamer, thickener, ethylene glycol and remaining deionized water to the qualified ground slurry, adjust the rheology of the final product, and obtain the preliminary finished product of pesticide suspension containing thickener; Step 5, Post-processing: The preliminary finished product undergoes degassing and filtration post-processing; Step Six: Quality Inspection and Filling: The filtered preliminary finished product undergoes final inspection. After passing the inspection, it is metered and filled in a clean environment using an automatic filling machine to prepare a qualified pesticide suspension containing thickener.

[0011] Preferably, the pre-dispersion mixing operation in step two is as follows: S2.1 Addition and premixing: Add 70%-80% of the formula amount of deionized water to the preparation tank, start the stirrer, and add ethylene glycol, sorbitol, sodium benzoate and borax in sequence at a speed of 300-400 rpm, and stir until completely dissolved. S2.2, Surfactant dispersion: While stirring, add fatty alcohol polyoxyethylene ether, polycarboxylate dispersant and sodium lignosulfonate in sequence, stir for 11-15 minutes to form a uniform and transparent aqueous solution of the additive. S2.3 Addition of active ingredients: Under stirring conditions at 25-30℃ and 1000-1100rpm, add pyraclostrobin and atrazine technical grade in sequence, and then use a high-speed shear emulsifier to shear and disperse for 18-25 minutes until a uniform slurry without obvious large particles is formed.

[0012] Preferably, the wet grinding operation in step three is as follows: S3.1 Grinding Preparation: Transfer the pre-dispersed slurry to the feed tank of the sand mill. Select 1-1.2mm zirconia beads as grinding media according to the target particle size, and fill the grinding chamber of the sand mill to 70%-80% of its volume. S3.2 Circulating Grinding: Start the sand mill and preheat for 30-40 minutes. Then, control the material flow rate and the cooling water temperature of the grinding chamber to perform 2-4 cycles of circulating grinding. Take samples every 20-30 minutes to test the particle size. S3.3 Particle size control: Use a laser particle size analyzer to monitor the particle size of the slurry until the particle size is ≤5μm and the maximum particle size is ≤12μm, then the grinding is considered to be up to standard.

[0013] Preferably, the circulating grinding conditions in S3.2 are: controlling the material flow rate to 1-1.2 m³ / h, controlling the cooling water temperature of the grinding chamber to 8-18℃, so that the discharge temperature does not exceed 45℃.

[0014] Preferably, the mixing and thickening operations in step four are as follows: S4.1 Adding additives and mixing: Transfer the slurry that has been ground to the required standard to a mixing tank, and add the amount of defoamer specified in the formula while stirring at a speed of 200-300 rpm; S4.2 Thickener Preparation and Addition: Prepare a colloidal solution by mixing the specified amount of thickener, ethylene glycol and remaining deionized water at a high speed of 1000-1200 rpm. Maintain the stirring speed of the mixing tank and add the colloidal solution dropwise to the slurry containing defoamer in S4.1 at a temperature of 20-35℃. S4.3 System Adjustment: After the addition of materials is completed, continue stirring for 30-45 minutes, detect and adjust the pH value of the system to 7-8, and take a sample to test the initial viscosity. Measure the viscosity at 22-25℃ and control it within the range of 300-800 mPa·s.

[0015] Preferably, the post-processing operation in step five is as follows: S5.1 Defoaming and degassing: Let the mixed preliminary product stand for 1.5-3.5 hours while stirring at a low speed of 10-20 rpm, and then use a vacuum degassing device with a vacuum degree of -0.04 to -0.06 MPa for 1-2 hours for degassing. S5.2 Filtration: The preliminary defoaming and degassing product is filtered through a 100-200 mesh sieve to completely remove grinding media fragments or impurities.

[0016] Compared with the prior art, the present invention provides a pesticide suspension formulation containing a thickener and its production method, which has the following beneficial effects: 1. This invention constructs a composite dispersion system with polycarboxylate dispersant as the main component and sodium lignosulfonate as the auxiliary component, and works synergistically with a thickening suspension system composed of xanthan gum and magnesium aluminum silicate, so that the prepared pesticide suspension can achieve multiple stabilizing effects from electrostatic repulsion and steric hindrance to three-dimensional network physical barrier, thereby improving the long-term suspension stability of the pesticide suspension product and effectively preventing sedimentation, water separation and agglomeration during storage.

[0017] 2. This invention achieves precise control over the particle size distribution, viscosity, and pH value of pesticide suspension products by specifying strict upper limits for active ingredient content, impurities, and moisture, and by adopting a standardized step-by-step production process (including constant-speed and constant-temperature pre-dispersion shearing, temperature- and flow-controlled wet grinding, and sequential addition of post-blending). This ensures the consistency of quality across batches and solves the problem of large quality fluctuations caused by reliance on experience in traditional production. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the preparation process of the pesticide suspension of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 A pesticide suspension formulation containing a thickener, wherein the pesticide suspension formulation has the following mass ratio: pyraclostrobin 8%-12%; atrazine 22%-26%; fatty alcohol polyoxyethylene ether (wetting agent) 3%-5%; polycarboxylate dispersant 5%-7%; sodium lignosulfonate 2%-4%; magnesium aluminum silicate 0.9%-1.8%; ethylene glycol 3%-6%; sorbitol 1.5%-2.5%; sodium benzoate 0.1%-0.3%; borax 0.8%-1.6%; defoamer 0.1%-0.4%; thickener 0.3%-0.6%; and the remaining component is deionized water.

[0021] Specifically, the functions of the raw materials are shown in Table 1 below: Table 1

[0022] Specifically, pyraclostrobin is the technical grade, with an active ingredient content ≥96.6%, acidity (as H2SO4) ≤0.25%, moisture ≤0.4%, and acetone-insoluble matter ≤0.4%. These raw material indicators are the basis for ensuring accurate formulation content, processing stability, and long-term storage chemical stability. Atrazine is the technical grade, with an active ingredient content ≥97%, moisture ≤0.8%, and a pH range of 6.0-8.0. Controlling the physicochemical indicators of the above raw materials within the specified range helps ensure their compatibility with pyraclostrobin and other adjuvants, and obtains ideal particle fineness in wet grinding.

[0023] Specifically, the defoamer is selected from one of the following: polyether-modified silicone oil, organosilicon paste defoamer, fatty alcohol defoamer (such as C8-C10 alcohol), or mineral oil-based defoamer. In actual production, polyether-modified silicone oil is preferred due to its high efficiency and good system compatibility.

[0024] Specifically, the thickener is selected from one or two of xanthan gum, magnesium aluminum silicate, sodium carboxymethyl cellulose (CMC) or polyvinyl alcohol (PVA). To achieve the best suspension stability and pourability, the optimal mass ratio of xanthan gum to magnesium aluminum silicate is 1:11, which can utilize the strong pseudoplasticity of xanthan gum and the three-dimensional network structure of magnesium aluminum silicate to produce a synergistic effect.

[0025] Specifically, a method for producing a pesticide suspension containing a thickener includes the following steps: Step 1: Raw material formulation design: Prepare the following raw materials by mass ratio according to the designed formulation: pyraclostrobin, atrazine, fatty alcohol polyoxyethylene ether, polycarboxylate dispersant, sodium lignosulfonate, magnesium aluminum silicate, ethylene glycol, sorbitol, sodium benzoate, borax, defoamer, thickener, and deionized water, for later use. Step 2, Pre-dispersion mixing: The active ingredients, dispersant, wetting agent and deionized water are initially mixed to form a pre-dispersion slurry; Step 3, wet grinding: The pre-dispersed slurry is subjected to wet circulating grinding to make the particle size reach the predetermined standard, and the qualified slurry is then used for the next step of formulation. Step 4, Blending and Thickening: Add defoamer, thickener, ethylene glycol and remaining deionized water to the qualified ground slurry, adjust the rheology of the final product, and obtain the preliminary finished product of pesticide suspension containing thickener; Step 5, Post-processing: The preliminary finished product undergoes degassing and filtration post-processing; Step Six: Quality Inspection and Filling: The filtered preliminary product undergoes final testing for effective content, pH value, viscosity, suspension rate, pourability, and hot / cold storage stability. After passing the tests, the product is metered, filled, sealed, and labeled using an automatic filling machine in a clean environment, thus producing a qualified pesticide suspension containing thickener.

[0026] By balancing the above-mentioned scientific raw material formulation and combining it with optimized process design, while ensuring high suspension rate (≥90%) and stability in hot / cold storage, the viscosity of the final product is optimized within a suitable range. By selecting a highly efficient and compatible defoamer, the final pesticide suspension has both excellent storage stability and good performance in use (easy to pour, easy to dilute, low foaming), thus achieving a balance between the stability and practicality of the finished product.

[0027] Specifically, the pre-dispersion mixing operation in step two: S2.1 Addition and premixing: Add 70%-80% of the formula amount of deionized water to the preparation tank, start the stirrer, and add ethylene glycol, sorbitol, sodium benzoate and borax in sequence at a speed of 300-400 rpm, and stir until completely dissolved. S2.2, Surfactant dispersion: While stirring, add fatty alcohol polyoxyethylene ether, polycarboxylate dispersant and sodium lignosulfonate in sequence, stir for 11-15 minutes to form a uniform and transparent aqueous solution of the additive. S2.3 Addition of active ingredients: Under stirring conditions at 25-30℃ and 1000-1100rpm, add pyraclostrobin and atrazine technical grade in sequence, and then use a high-speed shear emulsifier to shear and disperse for 18-25 minutes until a uniform slurry without obvious large particles is formed.

[0028] The advantages are: through step-by-step, orderly feeding and high-speed shearing, the complete dissolution of the aqueous phase additives and the initial wetting and breaking of the active ingredients can be ensured. Among them, steps S2.1-S2.2 form a uniform additive solution under moderate stirring, creating an ideal environment for the dispersion of the active ingredient; step S2.3 can initially break up the active ingredient clumps to form a uniform slurry, laying the foundation for subsequent efficient grinding and avoiding the problems of low grinding efficiency and excessively wide particle size distribution caused by uneven pre-dispersion.

[0029] Specifically, the wet grinding operation in step three: S3.1 Grinding Preparation: Transfer the pre-dispersed slurry to the feed tank of the sand mill. Select 1-1.2mm zirconia beads as grinding media according to the target particle size, and fill the grinding chamber of the sand mill to 70%-80% of its volume. S3.2 Circulating Grinding: Start the sand mill and preheat for 30-40 minutes. Then, control the material flow rate and the cooling water temperature of the grinding chamber to perform 2-4 cycles of circulating grinding. Take samples every 20-30 minutes to test the particle size. S3.3 Particle size control: Use a laser particle size analyzer to monitor the particle size of the slurry until 90% of the particles have a diameter (D90) ≤ 5μm and the maximum particle size is ≤ 12μm, then the grinding is considered to be up to standard.

[0030] Specifically, the circulating grinding conditions in S3.2 are as follows: control the material flow rate to 1-1.2 m³ / h (or, according to the equipment specifications, control the grinding chamber linear velocity to 10-14 m / s), control the grinding chamber cooling water temperature to 8-18℃, and ensure that the discharge temperature does not exceed 45℃.

[0031] The advantages are: by adopting a wet circulating grinding process and using zirconia beads as the grinding media, the active ingredient particles can be broken down to the micron level through intense collision and shearing forces. Steps S3.1-S3.3 control the grinding process precisely by controlling the key parameters of media filling rate, flow rate and temperature, ensuring that the final product achieves a fine and uniform particle size distribution of D90≤5μm, thereby obtaining a suspension with high suspension rate, stability and efficacy.

[0032] Specifically, the mixing and thickening process in step four: S4.1 Adding additives and mixing: Transfer the slurry that has been ground to the required standard to a mixing tank, and add the amount of defoamer specified in the formula while stirring at a speed of 200-300 rpm; S4.2 Thickener Preparation and Addition: Prepare a homogeneous colloidal solution by mixing the thickener, ethylene glycol and remaining deionized water in the specified amount at a high speed of 1000-1200 rpm. Maintain the stirring speed of the mixing tank and add the colloidal solution dropwise to the slurry containing the defoamer in S4.1 at a temperature of 20-35℃. S4.3 System Adjustment: After the addition of materials is completed, continue stirring for 30-45 minutes to fully hydrate and homogenize the system. Detect and adjust the pH value of the system to 7-8, and take a sample to test the initial viscosity. Use a rotational viscometer to measure the viscosity at 22-25℃, and control the viscosity within the range of 300-800 mPa·s.

[0033] The advantages are: this step can build a stable structure for the final product; adding defoamer in step S4.1 can suppress foam generated in subsequent operations in advance; and in step S4.2, the thickener is pre-prepared into a colloidal solution and added drop by drop, which can effectively avoid the formation of insoluble clumps that may occur when directly adding materials, thus ensuring uniform hydration of the thickener; step S4.3, through thorough stirring and balancing and precise control of viscosity at 300-800 mPa·s, enables the finished product to have both good suspension stability (anti-sedimentation) and ease of use (easy to pour and easy to dilute); and by stabilizing the pH of the system in the neutral-to-alkaline range of 7-8, it is compatible with the above-mentioned active ingredients and adjuvants.

[0034] Specifically, the post-processing operation in step five: S5.1, Defoaming and Degassing: Let the preliminary finished product after blending stand for aging for 1.5 - 3.5 hours, and stir at a low speed of 10 - 20 rpm to promote defoaming. Then, use a vacuum degassing device with a vacuum degree of -0.04 to -0.06 MPa for 1 - 2 hours of degassing treatment to remove tiny bubbles. S5.2, Filtration: Filter the preliminary finished product after defoaming and degassing through a 100 - 200 mesh sieve to remove a very small amount of possible grinding medium fragments or impurities.

[0035] Advantages: Through the combined process of standing for aging + low - speed stirring + vacuum degassing, it can completely eliminate the tiny bubbles entrained inside the product, preventing the bubbles from affecting the packaging appearance, metering accuracy, and storage stability.

[0036] Example 1: Weigh according to mass percentage: Pyraclostrobin 10%, Atrazine 24%, Fatty Alcohol Polyoxyethylene Ether 4%, Polycarboxylate Dispersant 6%, Sodium Lignosulfonate 3%, Magnesium Aluminum Silicate 1.5%, Ethylene Glycol 5%, Sorbitol 2%, Sodium Benzoate 0.2%, Borax 1.2%, Polyether Modified Silicon Defoaming Agent 0.3%, Xanthan Gum 0.2% and Magnesium Aluminum Silicate (extra) 1.3% for compound thickening, and make up to 100% with deionized water. Prepared strictly according to the described production method, the obtained suspending agent has an appearance of a flowable white thick liquid. After testing, D90 = 3.8μm, suspension rate 98.5%, decomposition rate <2% after thermal storage (54 ± 2°C, 14 days), and all indicators are qualified.

[0037] Example 2: Weigh according to mass percentage: Pyraclostrobin 8%, Atrazine 26%, Fatty Alcohol Polyoxyethylene Ether 3.5%, Polycarboxylate Dispersant 6.5%, Sodium Lignosulfonate 2.5%, Magnesium Aluminum Silicate 1.2%, Ethylene Glycol 4%, Sorbitol 2.2%, Sodium Benzoate 0.15%, Borax 1.0%, Organosilicon Paste - like Defoaming Agent 0.25%, Carboxymethyl Cellulose Sodium (CMC) 0.5%, and make up to 100% with deionized water. Prepared according to the method, the finished product D90 = 4.5μm, suspension rate 97.8%. After cold storage (0°C, 7 days) and returning to room temperature, no crystallization occurs, and the performance is stable.

[0038] Example 3: Weigh according to mass percentage: Pyraclostrobin 12%, Atrazine 22%, Fatty Alcohol Polyoxyethylene Ether 4.5%, Polycarboxylate Dispersant 5.5%, Sodium Lignosulfonate 3.5%, Magnesium Aluminum Silicate 1.8%, Ethylene Glycol 6%, Sorbitol 1.8%, Sodium Benzoate 0.25%, Borax 1.5%, Fatty Alcohol - type Defoaming Agent (C10 alcohol) 0.35%, Xanthan Gum 0.25% and Polyvinyl Alcohol (PVA) 0.2% for compound thickening, and make up to 100% with deionized water. Prepared according to the method, the finished product D90 = 3.2μm, viscosity 750 mPa·s, excellent pourability, and the suspension rate still remains above 96% after thermal storage.

[0039] The three sample examples prepared above (the present invention) and three commercially available pyraclostrobin or atrazine single-agent suspensions (controls A, B, and C) were used for the control of post-emergence weeds and foliar diseases in corn fields for 30 days. The data recorded during this period are shown in Table 2 below: Table 2 Comparison of Field Efficacy and Stability Data

[0040] Table 2 shows that the three sample examples prepared from the raw material formulation of this invention all showed better initial suspension rates than commercially available products. Furthermore, after 30 days of long-term storage, the product of this invention exhibited superior physical stability in key indicators such as suspension rate and water separation rate after heat storage, with a high suspension rate retention rate and an extremely low water separation rate. In terms of field efficacy, the compound formulation of this invention simultaneously demonstrated excellent herbicidal and disease-preventing effects, and its comprehensive efficacy was superior to the single-agent control, reflecting the unity of synergistic effect and excellent stability of the formulation of this invention.

[0041] In summary, this invention provides a scientifically formulated and rigorously crafted pesticide suspension concentrate containing thickeners, along with its production method. Through precise control of raw material specifications, an optimized surfactant compound system (wetting / dispersion synergy), and the synergistic effect of thickening suspension systems such as xanthan gum and magnesium aluminum silicate, combined with stepwise pre-dispersion, controllable wet grinding, and post-adjustment processes, a suspension concentrate product with fine and uniform particle size, excellent suspension stability, good low-temperature stability, and full efficacy was successfully prepared. This effectively solves the common industry problems of traditional suspension concentrates, such as easy sedimentation, clumping, stratification, and performance degradation after storage.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pesticide suspension formulation containing a thickener, characterized in that, The pesticide suspension formulation has the following mass ratio: pyraclostrobin 8%-12%; atrazine 22%-26%; fatty alcohol polyoxyethylene ether 3%-5%; polycarboxylate dispersant 5%-7%; sodium lignosulfonate 2%-4%; magnesium aluminum silicate 0.9%-1.8%; ethylene glycol 3%-6%; sorbitol 1.5%-2.5%; sodium benzoate 0.1%-0.3%; borax 0.8%-1.6%; defoamer 0.1%-0.4%; thickener 0.3%-0.6%; and the remaining component is deionized water.

2. The pesticide suspension formulation containing a thickener according to claim 1, characterized in that: The pyraclostrobin is the technical grade, with an active ingredient content ≥96.6%, acidity ≤0.25%, moisture ≤0.4%, and acetone-insoluble matter ≤0.4%; the atrazine is the technical grade, with an active ingredient content ≥97%, moisture ≤0.8%, and pH range 6.0-8.

0.

3. The pesticide suspension formulation containing a thickener according to claim 1, characterized in that: The defoamer is selected from one of the following: polyether modified silicone oil, organosilicon paste defoamer, fatty alcohol defoamer, or mineral oil-based defoamer.

4. The pesticide suspension formulation containing a thickener according to claim 1, characterized in that: The thickener is selected from one or two of xanthan gum, magnesium aluminum silicate, sodium carboxymethyl cellulose, or polyvinyl alcohol.

5. The method for producing a pesticide suspension containing a thickener according to claim 1, characterized in that, Includes the following steps: Step 1: Raw material formulation design: Prepare the following raw materials by mass ratio according to the designed formulation: pyraclostrobin, atrazine, fatty alcohol polyoxyethylene ether, polycarboxylate dispersant, sodium lignosulfonate, magnesium aluminum silicate, ethylene glycol, sorbitol, sodium benzoate, borax, defoamer, thickener, and deionized water, for later use. Step 2, Pre-dispersion mixing: The active ingredients, dispersant, wetting agent and deionized water are initially mixed to form a pre-dispersion slurry; Step 3, wet grinding: The pre-dispersed slurry is subjected to wet circulating grinding to make the particle size reach the predetermined standard, and the qualified slurry is then used for the next step of formulation. Step 4, Blending and Thickening: Add defoamer, thickener, ethylene glycol and remaining deionized water to the qualified ground slurry, adjust the rheology of the final product, and obtain the preliminary finished product of pesticide suspension containing thickener; Step 5, Post-processing: Degas and filter the preliminary finished product; Step Six: Quality Inspection and Filling: The filtered preliminary finished product undergoes final inspection. After passing the inspection, it is metered and filled in a clean environment using an automatic filling machine to prepare a qualified pesticide suspension containing thickener.

6. The method for producing a pesticide suspension containing a thickener according to claim 5, characterized in that: The pre-dispersion mixing operation in step two: S2.1 Addition and premixing: Add 70%-80% of the formula amount of deionized water to the preparation tank, start the stirrer, and add ethylene glycol, sorbitol, sodium benzoate and borax in sequence at a speed of 300-400 rpm, and stir until completely dissolved. S2.2, Surfactant dispersion: While stirring, add fatty alcohol polyoxyethylene ether, polycarboxylate dispersant and sodium lignosulfonate in sequence, stir for 11-15 minutes to form a uniform and transparent aqueous solution of the additive. S2.3 Addition of active ingredients: Under stirring conditions at 25-30℃ and 1000-1100rpm, add pyraclostrobin and atrazine technical grade in sequence, and then use a high-speed shear emulsifier to shear and disperse for 18-25 minutes until a uniform slurry without obvious large particles is formed.

7. The method for producing a pesticide suspension containing a thickener according to claim 5, characterized in that: The wet grinding operation in step three: S3.1 Grinding Preparation: Transfer the pre-dispersed slurry to the feed tank of the sand mill. Select 1-1.2mm zirconia beads as grinding media according to the target particle size, and fill the grinding chamber of the sand mill to 70%-80% of its volume. S3.2 Circulating Grinding: Start the sand mill and preheat for 30-40 minutes. Then, control the material flow rate and the cooling water temperature of the grinding chamber to perform 2-4 cycles of circulating grinding. Take samples every 20-30 minutes to test the particle size. S3.3 Particle size control: Use a laser particle size analyzer to monitor the particle size of the slurry until the particle size is ≤5μm and the maximum particle size is ≤12μm, then the grinding is considered to be up to standard.

8. The method for producing a pesticide suspension containing a thickener according to claim 5, characterized in that: The circulating grinding conditions in S3.2 are as follows: the material flow rate is controlled at 1-1.2 m³ / h, the cooling water temperature of the grinding chamber is controlled at 8-18℃, and the discharge temperature is not higher than 45℃.

9. A method for producing a pesticide suspension containing a thickener according to claim 5, characterized in that: The mixing and thickening operations in step four: S4.1 Adding additives and mixing: Transfer the slurry that has been ground to the required standard to a mixing tank, and add the amount of defoamer specified in the formula while stirring at a speed of 200-300 rpm; S4.2 Thickener Preparation and Addition: Prepare a colloidal solution by mixing the specified amount of thickener, ethylene glycol and remaining deionized water at a high speed of 1000-1200 rpm. Maintain the stirring speed of the mixing tank and add the colloidal solution dropwise to the slurry containing defoamer in S4.1 at a temperature of 20-35℃. S4.3 System Adjustment: After the addition of materials is completed, continue stirring for 30-45 minutes, detect and adjust the pH value of the system to 7-8, and take a sample to test the initial viscosity. Measure the viscosity at 22-25℃ and control it within the range of 300-800 mPa·s.

10. A method for producing a pesticide suspension containing a thickener according to claim 5, characterized in that: The post-processing operation in step five: S5.1 Defoaming and degassing: Let the mixed preliminary product stand for 1.5-3.5 hours while stirring at a low speed of 10-20 rpm, and then use a vacuum degassing device with a vacuum degree of -0.04 to -0.06 MPa for 1-2 hours for degassing. S5.2 Filtration: The preliminary defoaming and degassing product is filtered through a 100-200 mesh sieve to completely remove grinding media fragments or impurities.

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