A silicone-based long-acting anti-caking agent for hymexazol soluble powder and a preparation method thereof

Abstract

The application provides a silicone-based long-acting anti-caking agent for hymexazol soluble powder and a preparation method thereof, and belongs to the technical field of hymexazol soluble powder; the preparation method comprises an epoxy-modified organosiloxane mixing step; in the epoxy-modified organosiloxane step, phenyltriethoxysilane, dimethyldiethoxysilane and 3-glycidyl ether oxypropyl triethoxysilane are mixed, and then deionized water and a hydrochloric acid solution are added; after uniform stirring, hydrolysis polycondensation is carried out at 50-80 DEG C for 2-4 h; condensation is carried out at 120-140 DEG C and under reduced pressure of-0.08 to-0.09 MPa for 1-2 h; after cooling and sieving, the obtained white powder is the epoxy-modified organosiloxane; the anti-caking agent prepared by the application has good anti-caking performance, high suspensibility and excellent fluidity.

Description

Technical Field

[0001] This invention belongs to the technical field of oxamyl soluble powder, specifically relating to an organosilicon-based long-lasting anti-caking agent for oxamyl soluble powder and its preparation method. Background Technology

[0002] Hymexazol, chemically known as 3-hydroxy-5-methylisoxazole, is a highly effective, broad-spectrum systemic fungicide. Its mechanism of action involves inhibiting cell wall synthesis and protein metabolism in pathogens, thereby achieving highly effective control of soil-borne fungal diseases. It also has the auxiliary effect of promoting crop root growth and improving crop resistance. It is one of the core agents in agricultural production for controlling soil-borne diseases such as rice damping-off, wilt of melons and vegetables, and root rot. This agent combines systemic therapeutic and protective effects, has a long-lasting effect, and requires low dosage. It is widely used in the green cultivation of various crops such as rice, wheat, melons, vegetables, flowers, and seedlings, and has significant application value and ecological significance in ensuring agricultural production and reducing the use of highly toxic fungicides.

[0003] To meet the needs of different application scenarios, oxamyl is usually processed into various dosage forms. Among them, soluble powder has become one of the mainstream dosage forms due to its relatively simple preparation process, low production cost, convenient use, and high safety. However, due to the molecular structure characteristics of hygroscopic agent technical, hygroscopic agent powder itself has a certain degree of hygroscopicity. Furthermore, the wetting agents and dispersants added during the powder preparation process are mostly hydrophilic surfactants, which further enhance the hygroscopicity of the powder. In actual storage, transportation, and sales, under high temperature, high humidity, and extrusion conditions, the powder is prone to surface swelling, adhesion, and agglomeration, resulting in severe clumping. This not only leads to a significant decrease in the flowability of the powder, causing inconvenience for field metering and application, but also causes problems such as slower powder dissolution, reduced suspension rate, and uneven spray dispersion, directly affecting the field efficacy of the pesticide. Moreover, the clumped powder is prone to decomposition and loss of active ingredients, significantly shortening the shelf life of the formulation. This is a key technical bottleneck restricting the industrial application and market promotion of hygroscopic agent soluble powder.

[0004] Therefore, developing a highly efficient anti-caking agent for oxamyl soluble powder to avoid caking during storage and thus ensure the long-term stability and field application effect of the formulation has become an urgent need in the field of agricultural pesticide formulation.

[0005] To address the caking problem of oxadixyl soluble powder, various anti-caking agents have been developed, primarily including inorganic anti-caking agents and organic single-surfactant anti-caking agents. Inorganic anti-caking agents mainly use raw materials such as silica, calcium stearate, talc, diatomaceous earth, and bentonite, combining multiple inorganic powders through mechanical mixing. They primarily work by physically isolating the powder to form an inorganic powder isolation layer on the surface of the oxadixyl powder, reducing particle contact and adhesion, thus achieving a preliminary anti-caking effect. Organic single surfactant anti-caking agents are usually made from single raw materials such as sodium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether, and lignin sulfonate. After emulsification and dilution, they are added to powders as additives. They mainly prevent caking by reducing the surface tension of powder particles and reducing the moisture absorption of the particles.

[0006] However, the anti-caking agent obtained by the above method has the following drawbacks when used in hymexazol soluble powder: First, the anti-caking effect is short-lived and secondary agglomeration is prone to occur. Inorganic anti-caking agents only provide physical isolation, and the powder is easy to fall off the surface of the oxamyl granules. During storage, transportation and compression, the isolation effect is lost. The hydrophilic group of a single surfactant is easy to absorb moisture from the air, and the problem of moisture absorption and agglomeration is more serious in high temperature and high humidity environments. Second, the poor compatibility with hymexazol technical grade leads to a decrease in the stability of the active ingredient in the powder, and some surfactants will reduce the suspension rate and solubility of hymexazol soluble powder, thus affecting the field application effect of the pesticide. Third, it is difficult to adapt to high temperature and high humidity storage and transportation environments, and the anti-caking failure phenomenon is quite serious during storage and transportation; Fourth, it is not environmentally friendly and has a high amount of caking agent added, which not only increases the amount of pesticide used, but also pollutes the soil microenvironment.

[0007] Therefore, an anti-caking agent for oxamyl soluble powder is provided, which improves anti-caking performance, suspension rate and flowability, and enhances the effect of additive application. Summary of the Invention

[0008] To address the technical problems existing in the prior art, this invention provides an organosilicon-based long-lasting anti-caking agent for oxamyl soluble powder and its preparation method, which reduces the agglomeration rate, increases the suspension rate, and enhances the flowability under high temperature and high humidity conditions.

[0009] To address the aforementioned technical problems, the present invention adopts the following technical solution: A method for preparing an organosilicon-based long-acting anti-caking agent for hymexazol soluble powder includes epoxy-modified organosilicon and mixing, specifically including the following steps: 1. Epoxy-modified organosiloxanes Phenyltriethoxysilane, dimethyldiethoxysilane, and 3-glycidyl etheroxypropyltriethoxysilane were added to a reaction vessel and stirred until homogeneous. Then, deionized water and 0.45-0.55 mol / L hydrochloric acid solution were added, and the mixture was hydrolyzed and polycondensed at 50-80℃ for 2-4 hours. Subsequently, the temperature was raised to 120-140℃ and the mixture was compressed at -0.08 to -0.09 MPa for 1-2 hours. After cooling, the mixture was pulverized through a 100-mesh sieve, and the resulting white powder was the epoxy-modified organosiloxane. The mass ratio of the phenyltriethoxysilane, dimethyldiethoxysilane, 3-glycidyl etheroxypropyltriethoxysilane, deionized water, and hydrochloric acid solution is 45-65:30-40:5-15:18-24:0.6-1.0.

[0010] 2. Mixing An anti-caking agent is obtained by mixing epoxy-modified organosiloxane with glycine, anhydrous sodium sulfate, a composite dispersant, and a composite antistatic agent at 800-1000 rpm for 25-35 min. The mass ratio of the epoxy-modified organosiloxane to glycine, anhydrous sodium sulfate, composite dispersant, and composite antistatic agent is 100-130:80-90:15-30:25-35:35-45; The composite dispersant is a mixture of polycarboxylate and calcium lignosulfonate in a mass ratio of 1:1.7-2.2; The polycarboxylate is a sodium polyacrylate-styrene copolymer with a molecular weight of 3000-8000 Da, purchased from Jiangsu Haian Petrochemical Co., Ltd., and the product brand is HS-2000; the sulfonic acid group content of calcium lignosulfonate is 1.5-1.8 mmol / g. The composite antistatic agent is a mixture of polyether ester amide and polyether ester-sulfonate copolymer in a mass ratio of 1:0.8-1.2; The polyether ester amide was purchased from BASF AG, Germany, with the product name PEA-650; the polyether ester-sulfonate copolymer with a sulfonic acid group content of 0.8-1.5 mmol / g was purchased from Zhejiang Huangma Technology Co., Ltd., with the product name RM-ES300.

[0011] An organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder is prepared using the aforementioned preparation method.

[0012] This invention uses epoxy-modified organosiloxane as the core carrier, and synergistically incorporates glycine, anhydrous sodium sulfate, a polycarboxylate-calcium lignosulfonate composite dispersant, and a polyether amide-polyether sulfonate composite antistatic agent to construct an organic-inorganic synergistic interface regulation system. Specifically, epoxy-modified organosiloxane serves as the core interface carrier, glycine acts as an organic-inorganic bridging agent, anhydrous sodium sulfate is used to adjust ionic strength and hygroscopicity, the polycarboxylate-calcium lignosulfonate composite dispersant provides dual stability through electrostatics and steric hindrance, and polyether amide-polyether sulfonate acts as a composite antistatic agent to eliminate static electricity and reduce surface resistance, thus constructing a multi-layered, complementary, organic-inorganic synergistic interface regulation system. This system works synergistically from multiple dimensions, including hydrophobicity and moisture protection, spatial isolation, electrostatic repulsion, antistatic lubrication, and ion stabilization, to significantly improve the product's anti-caking properties, flowability, and suspension rate, meeting the requirements for high humidity and high temperature storage and transportation.

[0013] Compared with the prior art, the present invention has achieved the following beneficial effects: 1. The organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder prepared by this invention, with an addition amount of 0.8 wt%, has a caking rate of 0.8-2.1% after standing for 20 days at 40℃ and 80% RH, and a caking rate of 2.9-5.0% after standing for 50 days; 2. The organosilicon-based long-acting anti-caking agent for hymexazol soluble powder prepared by the present invention has an addition amount of 1.5 wt% and an angle of repose of 27.6-30.1°; and an addition amount of 0.8 wt% and a suspension rate of 74.3-79.1%. Detailed Implementation

[0014] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention are now described.

[0015] Example 1: Preparation of epoxy-modified organosiloxanes 65 parts by weight of phenyltriethoxysilane, 30 parts by weight of dimethyldiethoxysilane, and 5 parts by weight of 3-glycidyl etheroxypropyltriethoxysilane were added to a reaction vessel and stirred evenly. Then, 18 parts by weight of deionized water and 0.6 parts by weight of 0.55 mol / L hydrochloric acid were added. The mixture was hydrolyzed and polycondensed at 80°C for 2 hours, and then heated to 140°C and compressed at -0.08 MPa for 1 hour. After cooling, the mixture was pulverized through a 100-mesh sieve. The resulting white powder was the epoxy-modified organosiloxane.

[0016] Example 2 Preparation of epoxy-modified organosiloxanes 55 parts by weight of phenyltriethoxysilane, 35 parts by weight of dimethyldiethoxysilane, and 10 parts by weight of 3-glycidyl etheroxypropyltriethoxysilane were added to a reaction vessel and stirred evenly. Then, 20 parts by weight of deionized water and 0.8 parts by weight of 0.50 mol / L hydrochloric acid were added. The mixture was hydrolyzed and polycondensed at 60°C for 3 hours, and then the temperature was raised to 120°C and compressed at -0.085 MPa for 1.5 hours. After cooling, the mixture was pulverized through a 100-mesh sieve. The resulting white powder was the epoxy-modified organosiloxane.

[0017] Example 3 Preparation of epoxy-modified organosiloxanes 45 parts by weight of phenyltriethoxysilane, 40 parts by weight of dimethyldiethoxysilane, and 15 parts by weight of 3-glycidyl etheroxypropyltriethoxysilane were added to a reaction vessel and stirred evenly. Then, 24 parts by weight of deionized water and 1.0 part by weight of 0.45 mol / L hydrochloric acid were added. The mixture was hydrolyzed and polycondensed at 50°C for 4 hours, followed by compression polymerization at 130°C and -0.09 MPa for 2 hours. After cooling, the mixture was pulverized through a 100-mesh sieve, and the resulting white powder was the epoxy-modified organosiloxane.

[0018] Example 4: A method for preparing an organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder. 100g of epoxy-modified organosiloxane, 90g of glycine, 15g of anhydrous sodium sulfate, 25g of composite dispersant, and 35g of composite antistatic agent were mixed at 800rpm for 35min to obtain an anti-caking agent. The epoxy-modified organosiloxane was prepared in Example 3; The composite dispersant is a mixture of polycarboxylate and calcium lignosulfonate in a mass ratio of 1:2.2; The polycarboxylate is a sodium polyacrylate-styrene copolymer with a molecular weight of 8000 Da, purchased from Jiangsu Haian Petrochemical Co., Ltd., and its product brand is HS-2000; the sulfonic acid group content of calcium lignosulfonate is 1.8 mmol / g. The composite antistatic agent is a mixture of polyether ester amide and polyether ester-sulfonate copolymer in a mass ratio of 1:1.2; The polyether ester amide was purchased from BASF AG, Germany, with the product name PEA-650; the polyether ester-sulfonate copolymer with a sulfonic acid group content of 1.5 mmol / g was purchased from Zhejiang Huangma Technology Co., Ltd., with the product name RM-ES300.

[0019] Example 5: A method for preparing an organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder. 115g of epoxy-modified organosiloxane, 85g of glycine, 25g of anhydrous sodium sulfate, 30g of composite dispersant, and 40g of composite antistatic agent were mixed at 900rpm for 30min to obtain an anti-caking agent. The epoxy-modified organosiloxane was prepared according to Example 2; The composite dispersant is a mixture of polycarboxylate and calcium lignosulfonate in a mass ratio of 1:2; The polycarboxylate is a sodium polyacrylate-styrene copolymer with a molecular weight of 5600 Da, purchased from Jiangsu Haian Petrochemical Co., Ltd., and its product brand is HS-2000; the sulfonic acid group content of calcium lignosulfonate is 1.6 mmol / g. The composite antistatic agent is a mixture of polyether ester amide and polyether ester-sulfonate copolymer in a mass ratio of 1:1; The polyether ester amide was purchased from BASF AG, Germany, with the product name PEA-650; the polyether ester-sulfonate copolymer with a sulfonic acid group content of 1.2 mmol / g was purchased from Zhejiang Huangma Technology Co., Ltd., with the product name RM-ES300.

[0020] Example 6: A method for preparing an organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder. 130g of epoxy-modified organosiloxane, 80g of glycine, 30g of anhydrous sodium sulfate, 35g of composite dispersant, and 45g of composite antistatic agent were mixed at 1000rpm for 25min to obtain an anti-caking agent. The epoxy-modified organosiloxane was prepared in Example 1; The composite dispersant is a mixture of polycarboxylate and calcium lignosulfonate in a mass ratio of 1:1.7; The polycarboxylate is a sodium polyacrylate-styrene copolymer with a molecular weight of 3000 Da, purchased from Jiangsu Haian Petrochemical Co., Ltd., and its product brand is HS-2000; the sulfonic acid group content of calcium lignosulfonate is 1.5 mmol / g. The composite antistatic agent is a mixture of polyether ester amide and polyether ester-sulfonate copolymer in a mass ratio of 1:0.8; The polyether ester amide was purchased from BASF AG, Germany, with the product name PEA-650; the polyether ester-sulfonate copolymer with a sulfonic acid group content of 0.8 mmol / g was purchased from Zhejiang Huangma Technology Co., Ltd., with the product name RM-ES300.

[0021] Example 7: A method for preparing an organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder. Unlike Example 5, the composite dispersant was replaced with an equal amount of calcium lignosulfonate; the sulfonic acid group content of the calcium lignosulfonate was 1.6 mmol / g. The rest of the operations are exactly the same.

[0022] Example 8: A method for preparing an organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder. Example 5 differs in that the composite antistatic agent is replaced in equal amounts with polyether ester amide; the polyether ester amide is purchased from BASF AG, Germany, and the product brand name is PEA-650; The rest of the operations are exactly the same.

[0023] Example 9: A method for preparing an organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder. Unlike Example 5, the composite antistatic agent was replaced in equal amounts with a polyether ester-sulfonate copolymer; the polyether ester-sulfonate copolymer had a sulfonic acid group content of 1.2 mmol / g and was purchased from Zhejiang Huangma Technology Co., Ltd., with the product brand name RM-ES300; The rest of the operations are exactly the same.

[0024] Example 10: A method for preparing an organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder. Unlike Example 5, the epoxy-modified organosiloxane was replaced in equal amounts with the epoxy-modified organosiloxane prepared in Example 1. The rest of the operations are exactly the same.

[0025] Example 11: A method for preparing an organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder. Unlike Example 5, the epoxy-modified organosiloxane was replaced in equal amounts with the epoxy-modified organosiloxane prepared in Example 3. The rest of the operations are exactly the same.

[0026] Comparative Example 1 Unlike Example 4, glycine was replaced with an equal amount of dimethylsiloxane; The rest of the operations remain unchanged.

[0027] Comparative Example 2 Unlike Example 4, an anhydrous sodium sulfate was replaced with an equal amount of dimethylsiloxane; The rest of the operations remain unchanged.

[0028] Comparative Example 3 Unlike Example 4, glycine and anhydrous sodium sulfate were replaced with dimethylsiloxane in equal amounts; The rest of the operations remain unchanged.

[0029] Comparative Example 4 The difference from Example 4 is that the composite antistatic agent is replaced with an equal amount of composite dispersant; the composite dispersant is exactly the same as the composite dispersant in Example 4. The rest of the operations remain unchanged.

[0030] Comparative Example 5 The difference from Example 4 is that the composite dispersant is replaced with an equal amount of composite antistatic agent; the composite antistatic agent is exactly the same as the composite antistatic agent in Example 4. The rest of the operations remain unchanged.

[0031] Comparative Example 6 Unlike Example 4, the composite dispersant and composite antistatic agent were replaced with dimethylsiloxane in equal amounts; The rest of the operations remain unchanged.

[0032] Comparative Example 7 Unlike Example 4, glycine, anhydrous sodium sulfate, composite dispersant and composite antistatic agent were replaced with dimethylsiloxane in equal amounts. The rest of the operations remain unchanged.

[0033] Comparative Example 8 Mix 80wt% of oxamyl technical powder, 5wt% of sodium dodecylbenzene sulfonate, 8wt% of sodium lignosulfonate, and 7wt% of sodium sulfate evenly to obtain oxamyl soluble powder. The oxamyl raw powder was purchased from Shandong Dahe Biotechnology Co., Ltd., with an effective ingredient content of 98% and brand name DH-9801.

[0034] Comparative Example 9 Mix 97wt% oxamyl raw powder, 2wt% silica, and 1wt% calcium stearate evenly to obtain oxamyl soluble powder. The oxamyl raw powder was purchased from Shandong Dahe Biotechnology Co., Ltd., with an effective ingredient content of 98% and brand name DH-9801.

[0035] Performance Testing and Result Analysis 1. Anti-caking performance test (1) Test sample The anti-caking agents prepared in Examples 4-11 and Comparative Examples 1-7 were mixed evenly with oxamyl raw powder to obtain oxamyl soluble powder, i.e., anti-caking test samples. The product obtained from Comparative Example 8-9 is the anti-caking test sample. The amount of anti-caking agent added was 0.8 wt%; the oxamyl raw powder was purchased from Shandong Dahe Biotechnology Co., Ltd., with an effective ingredient content of 98% and the brand name DH-9801.

[0036] (2) Test method According to GB / T 19136-2021, the anti-caking test samples were placed into 50mL wide-mouth glass bottles, naturally stacked without compaction, and placed in a constant temperature and humidity chamber at 40℃ and RH80% for 20 days. The samples were then removed, passed through a 1.0mm sieve, and the mass of the agglomerated sample on the sieve was weighed to calculate the agglomeration rate. According to GB / T 19136-2021, the anti-caking test samples were placed into 50mL wide-mouth glass bottles, naturally stacked without compaction, and placed in a constant temperature and humidity chamber at 40℃ and RH80% for 50 days. The samples were then removed, passed through a 1.0mm sieve, and the mass of the agglomerated sample on the sieve was weighed to calculate the agglomeration rate. Formula for calculating agglomeration rate: Agglomeration rate (%) = (mass of agglomerated sample on the sieve / total mass of anti-agglomeration test sample) × 100%.

[0037] The agglomeration rate (%) after different standing times was statistically analyzed, and the specific results are as follows:

[0038] According to the test results above, the agglomeration rate of the example groups was significantly lower than 5% at both 20 and 50 days. Examples 10 and 11 performed the best, with an agglomeration rate of less than 3.5% at 50 days. This indicates that the combined use of polycarboxylate and calcium lignosulfonate, as well as the optimized preparation of epoxy-modified organosiloxane, have a significant effect on improving the anti-agglomeration effect. The control group showed more than 5% clumping after 20 days, and generally more than 15% after 50 days. Control groups 3, 6, 7 and 8 showed more than 20% clumping and hardening. As can be seen, when the anti-caking agent prepared in the example group is used in oxamyl soluble powder, the caking rate increases slowly and is controllable, while the comparative group shows an accelerated upward trend, verifying that the present invention has excellent continuous anti-caking ability during long-term storage.

[0039] 2. Liquidity Test (Angle of Dwell Method) (1) Test sample The anti-caking agents prepared in Examples 4-11 and Comparative Examples 1-7 were mixed evenly with oxamyl raw powder to obtain oxamyl soluble powder, i.e. flowability test samples. The product obtained from Comparative Example 8-9 is the flowability test sample. The amount of anti-caking agent added was 1.5 wt%; the oxamyl raw powder was purchased from Shandong Dahe Biotechnology Co., Ltd., with an effective ingredient content of 98% and the brand name DH-9801.

[0040] (2) Test method According to GB / T 21010-2007, flowability test samples are dropped freely through a standard funnel to form cones, and the angle (angle of repose) between the cone and the horizontal plane is measured. Each group is repeated 3 times and the average value is taken.

[0041] 3. Suspension rate test (1) Test sample The anti-caking agents prepared in Examples 4-11 and Comparative Examples 1-7 were mixed evenly with oxamyl raw powder to obtain oxamyl soluble powder, i.e. suspension test samples. The product obtained from Comparative Example 8-9 is the suspension rate test sample. The amount of anti-caking agent added was 0.8 wt%; the oxamyl raw powder was purchased from Shandong Dahe Biotechnology Co., Ltd., with an effective ingredient content of 98% and the brand name DH-9801.

[0042] (2) Test method Take 1.0g of suspension rate test sample and place it in a 250mL graduated cylinder. Add standard hard water (342mgCaCO3 / L) to 250mL. Invert the cylinder 30 times within 30s. Let it stand for 30min. Extract the upper 225mL, dry it and weigh it. This is the mass of the suspended effective component. The suspension rate is calculated according to GB / T 14825-2006: suspension rate = (mass of effective components suspended in the upper part / 0.98) × 100%.

[0043] The test results for statistical liquidity and floating ratio are as follows:

[0044] Liquidity rating criteria (referencing pharmacopoeia and powder engineering standards):

[0045] According to the test results above, the angle of repose of the example groups is ≤31°, among which Examples 10 and 11 performed the best (≤28°), with significantly better fluidity than other groups; the angle of repose of the comparative groups is generally ≥34°, among which Comparative Examples 3 and 6 exceed 38°, showing obvious bridging and slow collapse, with extremely poor fluidity. This is mainly because the example group contains a composite dispersant and an antistatic agent, which effectively reduces interparticle friction and electrostatic adsorption, thereby significantly improving flowability.

[0046] Unless otherwise stated, all percentages used in this invention are mass percentages.

[0047] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing an organosilicon-based long-acting anti-caking agent for hymexazol soluble powder, characterized in that, Includes epoxy-modified organosiloxanes and mixing steps: The epoxy-modified organosiloxane process involves mixing phenyltriethoxysilane, dimethyldiethoxysilane, and 3-glycidyl etheroxypropyltriethoxysilane, stirring until homogeneous, adding deionized water and hydrochloric acid solution, hydrolyzing and condensing at 50-80℃ for 2-4 hours, then compressing at 120-140℃ and -0.08 to -0.09 MPa for 1-2 hours. After cooling and sieving, the resulting white powder is the epoxy-modified organosiloxane. The mass ratio of the phenyltriethoxysilane, dimethyldiethoxysilane, 3-glycidyl etheroxypropyltriethoxysilane, deionized water, and hydrochloric acid solution is 45-65:30-40:5-15:18-24:0.6-1.

0.

2. The method for preparing an organosilicon-based long-acting anti-caking agent for hymexazol soluble powder according to claim 1, characterized in that, The mixing step involves mixing epoxy-modified organosiloxane with glycine, anhydrous sodium sulfate, a composite dispersant, and a composite antistatic agent at 800-1000 rpm for 25-35 minutes to obtain an anti-caking agent.

3. The method for preparing an organosilicon-based long-acting anti-caking agent for hymexazol soluble powder according to claim 2, characterized in that, The mass ratio of the epoxy-modified organosiloxane to glycine, anhydrous sodium sulfate, composite dispersant, and composite antistatic agent is 100-130:80-90:15-30:25-35:35-45.

4. The method for preparing an organosilicon-based long-acting anti-caking agent for hymexazol soluble powder according to claim 2, characterized in that, In the mixing step, the composite dispersant is a mixture of polycarboxylate and calcium lignosulfonate at a mass ratio of 1:1.7-2.2; The polycarboxylate is a sodium polyacrylate-styrene copolymer with a molecular weight of 3000-8000 Da, purchased from Jiangsu Haian Petrochemical Co., Ltd., and the product brand is HS-2000; the sulfonic acid group content of calcium lignosulfonate is 1.5-1.8 mmol / g.

5. A method for preparing an organosilicon-based long-acting anti-caking agent for hymexazol soluble powder according to claim 2, characterized in that, The composite antistatic agent is a mixture of polyether ester amide and polyether ester-sulfonate copolymer in a mass ratio of 1:0.8-1.2; The polyether ester amide was purchased from BASF AG, Germany, with the product name PEA-650; the polyether ester-sulfonate copolymer with a sulfonic acid group content of 0.8-1.5 mmol / g was purchased from Zhejiang Huangma Technology Co., Ltd., with the product name RM-ES300.

6. An organosilicon-based long-lasting anti-caking agent for hymexazol soluble powder, characterized in that, Prepared by the preparation method according to any one of claims 1-5.

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