Seed treatment suspending agent containing fludioxonil, prochloraz and thiamethoxam and preparation method thereof

Abstract

The invention relates to the technical field of pesticides, and particularly discloses a seed treatment suspending agent containing fludioxonil, prochloraz and thiamethoxam and a preparation method of the seed treatment suspending agent. The seed treatment suspending agent disclosed by the invention can be kept not to fall off for a long time after a film is formed on the surface of a seed, and the pesticide components such as fludioxonil, prochloraz and thiamethoxam can take effect for a long time, so that the actual requirements of agricultural production can be fully met, and the defects in related technologies are overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pesticides, more particularly, it relates to a seed treatment suspension agent containing fludioxonil, prochloraz and thiamethoxam and a preparation method thereof. BACKGROUND

[0002] Seed treatment agent is a kind of pesticide dosage form for seed surface treatment and has film forming property, usually takes pesticide raw material as effective component, and takes film forming agent, wetting agent, dispersing agent and other aids as aids to process. Seed treatment agent has the advantages of reducing the operation procedure of farmers in the field, preventing and treating diseases and pests, improving the emergence rate and seedling survival rate, long lasting effect and not easy to cause environmental pollution, etc., and is widely promoted and applied internationally. At present, the most widely promoted and used dosage form of seed treatment agent in China is seed treatment suspension agent, and fludioxonil, prochloraz and thiamethoxam are common effective components in seed treatment suspension agent.

[0003] Fludioxonil is a safe, efficient and low-toxicity new type of fungicide. It is a new type of non-systemic phenylpyrrole fungicide developed by Syngenta, also known as fluazinam. It is mainly used for diseases caused by Aspergillus, Penicillium and other fungi, and can prevent and control wheat web black rot, snow rot, etc., especially for the treatment of gray mold, the effect is particularly significant, and it is one of the largest seed treatment agents in the world so far.

[0004] Prochloraz, also known as probenazole, propineb, propan, and prochloraz, is a broad-spectrum imidazole fungicide that works by inhibiting the biosynthesis of sterols. Although it does not have systemic action, it has certain conductive properties. It has obvious preventive effect on diseases caused by ascomycetes and deuteromycetes in various crops, and can also be mixed with most fungicides, insecticides and herbicides, all of which have good control effect. Prochloraz has a therapeutic and eradication effect on a variety of diseases on field crops, fruits, vegetables, turf and ornamental plants.

[0005] Thiamethoxam belongs to the second generation of neonicotinoid insecticides, which was discovered by Novartis in 1991 and launched in New Zealand in 1997. Its mechanism of action is to selectively inhibit the acetylcholinesterase receptor in the central nervous system of insects, thereby blocking the normal transmission of the central nervous system of insects, causing the pests to appear paralyzed and die. It has high activity on Coleoptera, Diptera, Lepidoptera, especially Homoptera pests, and can efficiently control piercing-sucking mouthpart pests such as aphids, planthoppers and whiteflies.

[0006] In view of the related technologies in the above, the inventors believe that although the seed treatment suspension agent made of fludioxonil, prochloraz and thiamethoxam can effectively prevent and control diseases and pests in theory, the common seed treatment suspension agent on the market is difficult to keep on the seed surface for a long time after film forming, which affects the effectiveness of the pesticide components and cannot fully meet the actual needs of agricultural production. Summary of the Invention

[0007] Currently, commercially available seed treatment suspensions often fail to maintain their film-like consistency on seed surfaces for extended periods after formation, affecting the effectiveness of pesticide components and failing to fully meet the actual needs of agricultural production. To address this deficiency, this application provides a seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam, along with its preparation method.

[0008] In a first aspect, this application provides a seed treatment suspension containing fludioxonil, imazalil, and thiamethoxam, employing the following technical solution: A seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam comprises the following components by weight percentage: fludioxonil 2.6-3.0%, prochloraz 3.5-4.5%, thiamethoxam 20-22%, wetting and dispersing agent 8-10%, thickener 1-2%, antifreeze agent 3-6%, dyeing agent 0.1-0.3%, film-forming agent 3-5%, film-forming aid 4-6%, with the balance made up to 100% by water; the film-forming agent includes polysaccharide film-forming agent and gelatin, the film-forming aid includes halloysite nanotubes and SAP material, the SAP material is a graft copolymer of wheat starch and acrylic monomers, the acrylic monomers include acrylamide and acrylic acid, and the wetting and dispersing agent includes sodium lignosulfonate.

[0009] By adopting the above technical solution, this application uses polysaccharide film-forming agents and gelatin as film-forming agents, and adds SAP material and halloysite nanotubes as film-forming aids. The SAP material contains both starch and acrylic copolymer structures. The starch structure and polysaccharide film-forming agent contain a large number of hydroxyl groups, while the gelatin and acrylic copolymer contain a large number of amino and carboxyl groups. The surface of the halloysite nanotubes is covered with a large number of silanol and aluminum hydroxyl groups. Under the action of these groups, the film-forming agent and film-forming aid can jointly form a complex hydrogen bond network. Sodium lignosulfonate in the wetting and dispersing agent can also participate in the construction of the hydrogen bond network through phenolic hydroxyl and alcoholic hydroxyl groups. The complex hydrogen bond network enables the film layer formed by the seed treatment suspension to maintain good integrity, while the rigidity of sodium lignosulfonate and the high strength of the halloysite nanotubes make the hydrogen bond network more robust, improving the durability of the film layer. Furthermore, in humid environments, SAP materials can absorb a large amount of water through hydration, and after swelling, they gel, exhibiting a certain degree of water retention. This helps maintain moisture around the seeds, improving the germination environment and enhancing the adhesion of the film to the seed surface. The seed treatment suspension of this application can remain on the seed surface for a long time after forming a film, allowing the pesticide components such as fludioxonil, prochloraz, and thiamethoxam to remain effective for an extended period. This fully meets the actual needs of agricultural production and overcomes the shortcomings of related technologies.

[0010] Preferably, the polysaccharide film-forming agent includes Amomum villosum polysaccharide.

[0011] By adopting the above technical solution, strong hydrogen bonds can be formed between amomum polysaccharide and wheat starch. The SAP material of this application contains a structure derived from wheat starch. Therefore, amomum polysaccharide, as a polysaccharide film-forming agent, can not only play its own film-forming role, but also make the hydrogen bond network in the film layer stronger, thereby effectively preventing the film layer from falling off.

[0012] Preferably, the SAP material is prepared according to the following method: (1) Mix wheat starch with distilled water, and then heat, stir and gelatinize the mixture to obtain starch paste for later use; mix emulsifier and toluene to obtain emulsifier dispersion for later use; (2) The acrylic monomers after neutralization with emulsifier dispersion and sodium hydroxide solution are added to starch paste in sequence, stirred evenly, then initiator is added and heated under nitrogen protection. After the reaction is completed, the mixture is filtered, the resulting filter cake is acid washed and water washed and then dried, and then the dried product is pulverized to obtain SAP material.

[0013] By adopting the above technical solution, this application first gelatinizes wheat starch, then mixes the obtained starch paste with an emulsifier dispersion and stirs it to obtain a water-in-oil reverse emulsion. Under the action of an initiator and heating, hydrogen on the carbon ring of the gelatinized starch is removed, forming starch free radicals. The starch free radicals then undergo suspension polymerization with acrylic monomers. After the polymerization product is acid-washed to restore the carboxyl groups, it is then washed with water, dried, and pulverized to obtain the SAP material.

[0014] Preferably, in the method for preparing the SAP material, the weight ratio of starch to acrylic monomer is 1:(2-3).

[0015] By adopting the above technical solution, this application optimizes the weight ratio of starch to acrylic monomers. While increasing the total amount of acrylic monomers makes grafting with starch easier, it also increases the self-polymerization ratio of the acrylic monomers. Within the scope defined in this application, the acrylic monomers primarily react with starch, while the proportion of molecules undergoing self-polymerization is relatively small, resulting in a SAP material with relatively ideal performance.

[0016] Preferably, in the method for preparing the SAP material, the temperature of the heating reaction under nitrogen protection is 45-50°C.

[0017] By adopting the above technical solution, this application has optimized the reaction temperature of starch and acrylic monomers, which can yield SAP materials with relatively ideal performance.

[0018] Preferably, the acrylic monomer further includes 3-methylacrylamido-dopamine.

[0019] By adopting the above technical solution, the catechol group in 3-methacrylamide dopamine can form reversible hydrogen bonds with other components in the membrane, giving the membrane a self-healing effect and helping to reduce membrane shedding.

[0020] Preferably, the amount of 3-methacrylamido-dopamine is 0.7-1.3% of the total weight of the acrylic monomers.

[0021] By adopting the above technical solution, this application has optimized the dosage ratio of 3-methylacrylamide dopamine, which improves the self-healing effect of the membrane and helps to significantly reduce membrane detachment.

[0022] Preferably, the film-forming agent also includes polyvinyl alcohol.

[0023] By adopting the above technical solution, this application preferably uses polyvinyl alcohol as a component of the film-forming agent. The addition of polyvinyl alcohol can make the hydrogen bond network stronger, which helps to reduce the shedding of the film layer.

[0024] Preferably, the weight ratio of polyvinyl alcohol to polysaccharide film-forming agent is 1:(4.5-5.5).

[0025] By adopting the above technical solution, this application has optimized the weight ratio of polyvinyl alcohol to polysaccharide film-forming agent, which helps to reduce film peeling.

[0026] Secondly, this application provides a method for preparing a seed treatment suspension containing fludioxonil, imazalil, and thiamethoxam, using the following technical solution.

[0027] A method for preparing a seed treatment suspension containing fludioxonil, imazalil, and thiamethoxam includes the following steps: (1) Mix the wetting and dispersing agent, antifreeze agent and a portion of water, add the mixture to a container and stir until well combined; (2) Fludioxonil, imazalil and thiamethoxam are added to a container, and after homogenization and grinding, a slurry is obtained; (3) Mix the thickener, dye, film-forming agent, film-forming aid and the remaining water, homogenize and add to the slurry, stir evenly to obtain a seed treatment suspension containing fludioxonil, imazalil and thiamethoxam.

[0028] By adopting the above technical solution, this application uses fludioxonil, prochloraz, and thiamethoxam as active ingredients, and adds film-forming agents and film-forming aids during the preparation process to obtain a seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam. The seed treatment suspension of this application has good film-forming effect, and the film is not easily detached after formation, which can fully meet the actual needs of agricultural production.

[0029] In summary, this application has the following beneficial effects: 1. This application uses polysaccharide film-forming agents and gelatin as film-forming agents, and adds SAP material and halloysite nanotubes as film-forming aids. This enables the formation of a complex hydrogen bond network within the film layer. The properties of sodium lignosulfonate and halloysite nanotubes further strengthen this network, improving film durability. The SAP material, after absorbing water and swelling, undergoes gelation, enhancing the film's adhesion to the seed surface. The seed treatment suspension of this application remains on the seed surface for an extended period after film formation, allowing pesticide components such as fludioxonil, prochloraz, and thiamethoxam to remain effective for a prolonged time. This fully meets the practical needs of agricultural production and overcomes the shortcomings of related technologies.

[0030] 2. In this application, Amomum villosum polysaccharide is selected as a component of polysaccharide film-forming agent. Amomum villosum polysaccharide can form strong hydrogen bonds with wheat starch. The SAP material of this application contains a structure derived from wheat starch. Therefore, in addition to its own film-forming function, Amomum villosum polysaccharide, as a polysaccharide film-forming agent, can also make the hydrogen bond network in the film layer stronger, thereby effectively preventing the film layer from peeling off.

[0031] 3. In this application, 3-methylacrylamido-dopamine is selected as the acrylic monomer for preparing SAP materials. The catechol group in 3-methylacrylamido-dopamine can form reversible hydrogen bonds with other components in the membrane, giving the membrane a self-healing effect and helping to reduce membrane peeling. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the embodiments, preparation examples and comparative examples. The raw materials involved in the present application can all be obtained commercially.

[0033] Example of SAP material preparation The following explanation uses Preparation Example 1 as an example.

[0034] Preparation Example 1 In this preparation example, the weight ratio of starch to acrylic monomers is 1:2. The acrylic monomers include acrylamide and acrylic acid, which are mixed in a molar ratio of 3:1. The acrylic monomers are neutralized to pH 7 with 40 wt% sodium hydroxide before use.

[0035] In this preparation example, the SAP material was prepared according to the following method: (1) Mix 5g of wheat starch with 30g of distilled water, heat and stir to 90℃, gelatinize for 1h to obtain starch paste, cool to room temperature for later use; mix 0.2g of emulsifier and 56g of dispersant to obtain emulsifier dispersion for later use; in this step, Span 80 is selected as the emulsifier and toluene is selected as the dispersant. (2) The acrylic monomers after neutralization with emulsifier dispersion and sodium hydroxide solution were added to starch paste in sequence and stirred evenly. Then, 0.2g of initiator was added and heated at 45°C for 4h under nitrogen protection. After the reaction was completed, the mixture was filtered. The resulting filter cake was acid washed (using 2mol / L hydrochloric acid) and water washed and then dried. The dried product was then pulverized to obtain SAP material with an average particle size of 5μm. In this step, the initiator was composed of 2,2'-azobisisobutylammonium dihydrochloride and cerium ammonium nitrate in a weight ratio of 5:1.

[0036] Preparation Example 2 The difference between this preparation example and Preparation Example 1 is that the weight ratio of starch to acrylic monomer is 1:2.5.

[0037] Preparation Example 3 The difference between this preparation example and Preparation Example 1 is that the weight ratio of starch to acrylic monomer is 1:3.

[0038] Preparation Example 4 The difference between this preparation example and Preparation Example 1 is that the weight ratio of starch to acrylic monomer is 1:4.

[0039] Preparation Example 5 The difference between this preparation example and preparation example 3 is that, in the method for preparing the SAP material, the temperature of the heating reaction under nitrogen protection is 48°C.

[0040] Preparation Example 6 The difference between this preparation example and preparation example 3 is that, in the method for preparing the SAP material, the temperature of the heating reaction under nitrogen protection is 50°C.

[0041] Preparation Example 7 The difference between this preparation example and preparation example 3 is that, in the method for preparing the SAP material, the temperature of the heating reaction under nitrogen protection is 55°C.

[0042] Preparation Example 8 The difference between this preparation example and Preparation Example 6 is that the acrylic monomer also includes 3-methacrylamidodopamine, and the amount of 3-methacrylamidodopamine accounts for 0.5% of the total weight of the acrylic monomer. Preparation Example 9 The difference between this preparation example and Preparation Example 8 is that the amount of 3-methacrylamidodopamine used accounts for 0.7% of the total weight of the acrylic monomers. Preparation Example 10 The difference between this preparation example and Preparation Example 8 is that the amount of 3-methacrylamidodopamine used accounts for 1.0% of the total weight of the acrylic monomers. Preparation Example 11 The difference between this preparation example and Preparation Example 8 is that the amount of 3-methacrylamidodopamine used accounts for 1.3% of the total weight of the acrylic monomers. Example

[0043] Examples 1-3 The following description uses Example 1 as an example.

[0044] Example 1 In this embodiment, the wetting and dispersing agent is sodium lignosulfonate, the thickener is a mixture of magnesium aluminum silicate and attapulgite in a weight ratio of 0.3:1, the antifreeze agent is ethylene glycol, and the dye is basic rose extract. The film-forming agent includes a polysaccharide film-forming agent and gelatin; pullulan is selected as the polysaccharide film-forming agent, and the weight ratio of the polysaccharide film-forming agent to gelatin is 1:1. The film-forming aids include halloysite nanotubes and SAP material, with a weight ratio of halloysite nanotubes to SAP material of 1:5. The SAP material is prepared according to the method of Preparation Example 1.

[0045] This embodiment provides a seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam, comprising the following components by weight percentage: fludioxonil 2.6%, prochloraz 3.5%, thiamethoxam 20%, wetting and dispersing agent 8%, thickener 1%, antifreeze agent 3%, dyeing agent 0.1%, film-forming agent 3%, film-forming aid 4%, with the balance made up to 100% by water.

[0046] This embodiment provides a method for preparing a seed treatment suspension containing fludioxonil, imazalil, and thiamethoxam, comprising the following steps: (1) Mix the wetting and dispersing agent, antifreeze agent and 70% water and add to the container, then stir and mix well; (2) Fludioxonil, imazalil, and thiamethoxam were added to a container, and after homogenization and grinding, D was obtained. 98 Slurry with a thickness of ≤4μm; (3) Mix the thickener, dye, film-forming agent, film-forming aid and the remaining water, homogenize for 12 min and add to the slurry. Stir for 10 min to obtain a seed treatment suspension containing fludioxonil, imazalil and thiamethoxam.

[0047] As shown in Table 2, the main difference between Examples 1-3 is that the raw material ratios of the seed treatment suspension are different.

[0048] Table 2 Raw material ratio of seed treatment suspension Example 4 The difference between this embodiment and Embodiment 3 is that the polysaccharide film-forming agent is a mixture of pullulan polysaccharide and amomum polysaccharide in a weight ratio of 1:1.

[0049] Example 4-14 As shown in Table 3, the difference between Examples 4-14 is that the raw material ratio of SAP material is different.

[0050] Table 3 Raw material ratios for SAP materials Example 15 The difference between this embodiment and Embodiment 14 is that the film-forming agent also includes polyvinyl alcohol (average molecular weight 60,000), and the weight ratio of polyvinyl alcohol to polysaccharide film-forming agent is 1:7.

[0051] Example 16 The difference between this embodiment and Embodiment 15 is that the weight ratio of polyvinyl alcohol to polysaccharide film-forming agent is 1:5.5.

[0052] Example 17 The difference between this embodiment and Embodiment 15 is that the weight ratio of polyvinyl alcohol to polysaccharide film-forming agent is 1:5.

[0053] Example 18 The difference between this embodiment and Embodiment 15 is that the weight ratio of polyvinyl alcohol to polysaccharide film-forming agent is 1:4.5.

[0054] Comparative Example Comparative Example 1 The difference between this comparative example and Example 1 is that the seed treatment suspension does not include film-forming aids.

[0055] Comparative Example 2 The difference between this comparative example and Example 1 is that the wetting and dispersing agent is replaced with polycarboxylic acid dispersant SP-2700.

[0056] Comparative Example 3 The difference between this comparative example and Example 1 is that the film-forming aid does not include halloysite nanotubes.

[0057] Comparative Example 4 The difference between this comparative example and Example 1 is that the film-forming aid does not include SAP material.

[0058] Comparative Example 5 The difference between this comparative example and Example 1 is that the film-forming agent does not include a polysaccharide film-forming agent.

[0059] Comparative Example 6 The difference between this comparative example and Example 1 is that the film-forming agent does not include gelatin.

[0060] Performance testing method: Coating treatment: According to the record of "Thiamethoxam Seed Treatment Suspension" (HG / T 5443-2018), weigh 50g of rice seeds, place them in a 250mL plastic bottle, add 1g of seed treatment suspension, cover and shake for 1min, open the lid and spread the coated seeds evenly on a clean paper surface, and wait for film to form.

[0061] 10g of coated seeds were placed in a plastic tube, sealed tightly, and thrown from the ground to a height of 3m, allowing the plastic tube to fall freely. This process was repeated 80 times. The shedding rate was then tested according to the record in HG / T 5443-2018. The results are shown in Table 4.

[0062] Table 4 Shedding Rate Sample Drop off rate / % Sample Drop off rate / % Example 1 4.5 Example 13 3.1 Example 2 4.4 Example 14 3.0 Example 3 4.2 Example 15 2.7 Example 4 4.0 Example 16 2.6 Example 5 4.0 Example 17 2.6 Example 6 3.9 Example 18 2.5 Example 7 4.1 Comparative Example 1 9.2 Example 8 3.8 Comparative Example 2 5.3 Example 9 3.7 Comparative Example 3 5.9 Example 10 4.0 Comparative Example 4 7.1 Example 11 3.4 Comparative Example 5 4.8 Example 12 3.2 Comparative Example 6 5.0 Combining Examples 1-3 and Comparative Example 1 with Table 4, it can be seen that the drop rate measured in Examples 1-3 is lower than that in Comparative Example 1. This is because this application uses polysaccharide film-forming agents and gelatin as film-forming agents, and adds SAP material and halloysite nanotubes as film-forming aids. This allows for the formation of a complex hydrogen bond network within the film layer. Furthermore, the properties of sodium lignosulfonate and halloysite nanotubes enhance the strength of the hydrogen bond network, improving the durability of the film layer. After absorbing water and swelling, SAP undergoes gelation, strengthening the adhesion of the film layer to the seed surface and reducing film drop.

[0063] Combining Example 1 and Comparative Example 2 with Table 4, it can be seen that the peeling rate measured in Example 1 is relatively high. This is because the rigid groups in sodium lignosulfonate have a certain effect on reducing film peeling, while the wetting and dispersing agent in Comparative Example 2 lacks this effect and cannot fully exert the synergistic effect of each component, so the peeling of the film is more serious.

[0064] Combining Example 1 and Comparative Example 3 with Table 4, it can be seen that the shedding rate measured in Example 1 is relatively high. This is because the mechanical strength of halloysite nanotubes themselves plays a certain role in reducing film shedding. However, the wetting and dispersing agent in Comparative Example 3 lacks this effect and cannot fully exert the synergistic effect of each component, so the film shedding is more serious.

[0065] Combining Example 1 and Comparative Example 4 with Table 4, it can be seen that the shedding rate measured in Example 1 is relatively high. This is because SAP can gel after absorbing water and swelling, which enhances the adhesion of the membrane to the seed surface and reduces membrane shedding. Moreover, SAP also makes the hydrogen bond network more complex and robust. Comparative Example 4 lacks this effect and cannot fully utilize the synergistic effect of each component, thus resulting in more severe membrane shedding.

[0066] Based on Example 1 and Comparative Examples 5-6 and Table 4, it can be seen that the peeling rate measured in Example 1 is relatively high. This is because Comparative Examples 5-6 did not use the polysaccharide film-forming agent and gelatin together, so the synergistic effect of each component could not be fully utilized, resulting in more severe peeling of the film layer.

[0067] Combining Examples 3 and 4 with Table 4, it can be seen that the peeling rate measured in Example 4 is relatively high. This is because strong hydrogen bonds can be formed between Amomum villosum polysaccharide and wheat starch. The SAP material of this application contains a structure derived from wheat starch. Therefore, Amomum villosum polysaccharide, as a polysaccharide film-forming agent, can not only play its own film-forming role, but also make the hydrogen bond network in the film layer stronger, thereby effectively preventing the film layer from peeling off.

[0068] As can be seen from Examples 4-10 and Table 4, in the method for preparing SAP materials, if the weight ratio of starch to acrylic monomers is 1:(2-3), or if the reaction temperature under nitrogen protection is set to 45-50℃, SAP materials with relatively ideal performance and effective reduction of film peeling can be obtained. However, when the amount of acrylic monomers is too large or the reaction temperature is too high, the SAP resin cannot sufficiently reduce film peeling.

[0069] As can be seen from Examples 9 and 11-14, and Table 4, the overall shedding rate of Examples 11-14 is relatively low. This is because the catechol groups in 3-methacrylamido-dopamine can form reversible hydrogen bonds with other components in the membrane layer, giving the membrane layer a self-healing effect and helping to reduce membrane shedding. Furthermore, when the amount of 3-methacrylamido-dopamine accounts for 0.7-1.3% of the total weight of the acrylic monomers, it can more effectively reduce membrane shedding.

[0070] As can be seen from Examples 14, 15-18 and Table 4, the addition of polyvinyl alcohol can make the hydrogen bond network stronger, which helps to reduce the shedding of the film. When the weight ratio of polyvinyl alcohol to polysaccharide film-forming agent is 1:(4.5-5.5), the shedding of the film can be further suppressed.

[0071] The above embodiments are merely explanations of this application and are not intended to limit it. After reading this specification, those skilled in the art can make modifications to the embodiments of this application without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. A seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam, characterized in that, The product comprises the following components by weight percentage: fludioxonil 2.6-3.0%, imazalil 3.5-4.5%, thiamethoxam 20-22%, wetting and dispersing agent 8-10%, thickener 1-2%, antifreeze 3-6%, dyeing agent 0.1-0.3%, film-forming agent 3-5%, film-forming aid 4-6%, with the balance made up to 100% by water; the film-forming agent includes polysaccharide film-forming agent and gelatin, the film-forming aid includes halloysite nanotubes and SAP material, the SAP material is a graft copolymer of wheat starch and acrylic monomers, the acrylic monomers include acrylamide and acrylic acid, and the wetting and dispersing agent includes sodium lignosulfonate.

2. The seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam according to claim 1, characterized in that, The polysaccharide film-forming agent includes Amomum villosum polysaccharide.

3. The seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam according to claim 1, characterized in that, The SAP material is prepared according to the following method: (1) Mix wheat starch with distilled water, and then heat, stir and gelatinize the mixture to obtain starch paste for later use; mix emulsifier and toluene to obtain emulsifier dispersion for later use; (2) The acrylic monomers after neutralization with emulsifier dispersion and sodium hydroxide solution are added to starch paste in sequence, stirred evenly, then initiator is added and heated under nitrogen protection. After the reaction is completed, the mixture is filtered, the resulting filter cake is acid washed and water washed and then dried, and then the dried product is pulverized to obtain SAP material.

4. The seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam according to claim 3, characterized in that, In the method for preparing the SAP material, the weight ratio of starch to acrylic monomer is 1:(2-3).

5. The seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam according to claim 3, characterized in that, In the method for preparing the SAP material, the temperature of the heating reaction under nitrogen protection is 45-50°C.

6. The seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam according to claim 3, characterized in that, The acrylic monomers also include 3-methylacrylamido-dopamine.

7. The seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam according to claim 6, characterized in that, The amount of 3-methylacrylamide dopamine used accounts for 0.7-1.3% of the total weight of the acrylic monomers.

8. The seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam according to claim 6, characterized in that, The film-forming agent also includes polyvinyl alcohol.

9. The seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam according to claim 8, characterized in that, The weight ratio of polyvinyl alcohol to polysaccharide film-forming agent is 1:(4.5-5.5).

10. The method for preparing the seed treatment suspension containing fludioxonil, prochloraz, and thiamethoxam according to any one of claims 1-9, characterized in that, Includes the following steps: (1) Mix the wetting and dispersing agent, antifreeze agent and a portion of water and add them to a container, then stir and mix well; (2) Fludioxonil, imazalil and thiamethoxam are added to a container, and after homogenization and grinding, a slurry is obtained; (3) Mix the thickener, dye, film-forming agent, film-forming aid and the remaining water, homogenize and add to the slurry, stir evenly to obtain a seed treatment suspension containing fludioxonil, imazalil and thiamethoxam.

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