Dispersible oil suspending agent containing rimsulfuron and quizalofop-p-ethyl and preparation method thereof

Abstract

The invention discloses a dispersible oil suspending agent containing rimsulfuron and quizalofop-p-ethyl and a preparation method of the dispersible oil suspending agent, and belongs to the field of pesticide preparations. The dispersible oil suspending agent containing rimsulfuron and quizalofop-p-ethyl provided by the invention is prepared from the following components in percentage by mass: 0-5% of rimsulfuron, 5-10% of quizalofop-p-ethyl, 1-5% of a dispersing agent, 10-20% of an emulsifier, 1-5% of a thickening agent, 1-5% of a stabilizer and the balance of medium oil, wherein the content of rimsulfuron is not zero; the stabilizer is sodium benzoate and / or tannic acid. The dispersible oil suspending agent disclosed by the invention is good in physical state after being subjected to 7-day cold storage at 0 DEG C and 14-day hot storage at 54 DEG C, is free from thixotropy or curing, and is good in long-term storage stability at normal temperature; the decomposition rates of rimsulfuron and quizalofop-p-ethyl are relatively low.

Description

Technical Field

[0001] The invention relates to the field of pesticide preparations, and in particular to a dispersible oil suspension containing sulfasulfuron-methyl and quizalofop-p-ethyl and a preparation method thereof. Background Art

[0002] Rimsulfuron, also known as rimsulfuron, is a sulfonylurea herbicide developed by DuPont (now Corteva) in the United States. It has the characteristics of high selectivity, high efficiency and low toxicity. It is mainly used in corn, potato, tobacco and other crop fields to control annual or perennial grass and broadleaf weeds. The molecular formula of rimsulfuron is C 14 H 17 N5O7S2, CAS No. 122931-48-0, molecular weight 431.44. It is a systemic herbicide that inhibits the biosynthesis of side chain amino acids in plants, causing weed growth stagnation and death.

[0003] The physical and chemical properties of sulfasulfuron include: the pure product is a white crystalline solid, the melting point is between 176 and 178 ° C, the solubility in water at 25 ° C is less than 10 mg / L, the distribution coefficient (n-octanol / water) is 0.034, and the pKa is 4.1. It is stable in neutral soil and easily degraded in acidic or alkaline soil. The half-life in soil is 1.7 to 4.3 days. In terms of safety, the acute oral LD50 of sulfasulfuron to rats is greater than 5g / kg, and the acute dermal LD50 of sulfasulfuron to rabbits is greater than 2g / kg. It is slightly irritating to rabbit eyes, but has no irritating effect on the skin, and has no allergic effect on guinea pig skin. The acute inhalation LC50 (4 hours) of rats is greater than 5.4mg / L. In the feeding test, the no-effect dose is: 300mg / kg for male rats (2 years), 3g / kg for female rats (2 years); 2.5g / kg for mice (18 months), and 50mg / kg for dogs (1 year). The no-effect dose in the second generation reproduction test of rats was 3g / kg. The Ames test showed no mutagenic, teratogenic and carcinogenic effects.

[0004] Quizalofop-P-ethyl is an aromatic phenoxy propionate herbicide developed by Nissan Chemical Industries, Ltd. It is a highly selective dryland stem and leaf treatment agent, mainly used to control grass weeds in broad-leaved crop fields, such as soybeans, beets, rapeseed, cotton, peanuts, broad-leaved vegetables and other crops and fruit trees. Chemical name: (R)-2-[4-(6-chloroquinoxaline-2-yloxy)phenoxy]ethyl propionate, CAS number: 100646-51-3, molecular formula: C 19 H 17ClN2O4, molecular weight: 372.802, melting point: 76.5℃, boiling point: 220℃, flash point: 276.3℃, vapor pressure: 3.34E-12mmHg at 25℃, density: 1.3±0.1 g / cm 3 , boiling point: 503.9±50.0℃ at 760 mmHg, flash point: 258.6±30.1℃, PSA: 70.54000, LogP: 4.65. It has the appearance of white powder crystals, is stable under normal storage conditions, and has a solubility in water of 0.04 g / 100 mL. Quizalofop-p-ethyl is absorbed by the stems and leaves of weeds, and is conducted upward and downward in the plant body, accumulating in the apical and intercalary meristems, inhibiting cellular fatty acid synthesis and causing weed necrosis. Compared with quizalofop-p-ethyl, quizalofop-p-ethyl has improved plant absorbability and mobility within the plant, so it acts faster, the efficacy is nearly doubled, the amount per mu is reduced, and it is safer for the environment.

[0005] Dispersible oil suspension (OD) is a kind of active ingredient dispersed in a non-aqueous medium as solid particles to form a stable suspension liquid preparation, which is generally diluted with water for use. Sulfonsulfuron-methyl has the problem of chemical instability in dispersible oil suspension. The decomposition rate of single agent or related compound products is high after 14 days of heat storage at 54°C or long-term storage at room temperature, and the physical stability is poor, and there are problems of easy solidification and paste. Sulfonsulfuron-methyl has special chemical properties, and it is not possible to solve all chemical stability problems of related compound systems with one stabilizer solution. Summary of the invention

[0006] The purpose of the present invention is to provide a dispersible oil suspension containing sulfasulfuron-methyl and quizalofop-p-ethyl and a preparation method thereof, so as to solve the problems of high decomposition rate of active ingredients and poor physical stability of samples in compound dispersible oil suspensions of sulfasulfuron-methyl and quizalofop-p-ethyl.

[0007] The present invention first provides a dispersible oil suspension containing sulfasulfuron-methyl and quizalofop-p-ethyl, which is prepared from the following components in percentage by mass: Sulfonsulfuron 0-5%, quizalofop-p-ethyl 5%-10%, dispersant 1%-5%, emulsifier 10%-20%, thickener 1%-5%, stabilizer 1%-5%, and the balance is medium oil; wherein, the content of sulfonsulfuron is not zero; The stabilizer is sodium benzoate and / or tannic acid.

[0008] In the above-mentioned dispersible oil suspension, the dispersant is at least one of polycarboxylate and comb copolymer.

[0009] Specifically, the dispersant is SP-OF3498D or dispersant Atlox™ 4916 from Jiangsu Qingyu Chemical Technology Co., Ltd.

[0010] In the above-mentioned dispersible oil suspension, the emulsifier is any one of Geronol® VO / 01 (vegetable oil emulsifier), Geronol® VO / 02N (methyl oleate emulsifier) ​​of Solvay Investment Co., Ltd., OF-803L (methyl oleate emulsifier) ​​of Nanjing Yangzi Hongliyuan Chemical Co., Ltd. and VE / 10 (vegetable oil emulsifier) ​​of Suzhou Rongyida Chemical Co., Ltd.

[0011] In the above-mentioned dispersible oil suspension, the thickener is at least one of fumed hydrophobic silica and organic bentonite.

[0012] In the above-mentioned dispersible oil suspension, the medium oil is S-150 solvent oil and any one of the following: soybean oil, corn oil, rapeseed oil, high-saturated oleic acid methyl ester and S-200 solvent oil.

[0013] In the above-mentioned dispersible oil suspension, the thickener is fumed hydrophobic silica and organic bentonite; The medium oil is any one of the following: 1) S-150 solvent oil and rapeseed oil; 2) S-150 solvent oil and highly saturated methyl oleate.

[0014] In the above-mentioned dispersible oil suspension, the mass ratio of the fumed hydrophobic silica to the organic bentonite is 1:2-2:1; specifically, it can be 1:1.5, 1:1 or 2:1.

[0015] Based on the total mass of the dispersible oil suspension, the mass percentage of the S-150 solvent oil is 10% to 30%, specifically 10% or 20%.

[0016] Preferably, based on the total mass of the dispersible oil suspension, the dispersible oil suspension is made of the following components in any ratio: 1) Sulfonesulfuron 2.5%, Quizalofop-Ph-ethyl 8.5%, polycarboxylate 2.0%, emulsifier VE / 10 18.0%, stabilizer tannic acid 1.5%, fumed hydrophobic silica 1.0%, organic bentonite 1.5%, S-150 solvent oil 10%, and the balance is rapeseed oil; 2) Sulfonesulfuron 3.0%, Quizalofop-Ph-ethyl 10.0%, polycarboxylate 2.0%, emulsifier VE / 10 18.0%, stabilizer tannic acid 1.5%, fumed hydrophobic silica 1.0%, organic bentonite 1.0%, S-150 solvent oil 10%, and the balance is rapeseed oil; 3) Sulfonesulfuron 2.5%, Quizalofop-Ph-ethyl 8.5%, makeup copolymer 2.0%, emulsifier OF-803L 18.0%, stabilizer sodium benzoate 1.5%, fumed hydrophobic silica 2.0%, organic bentonite 2.0%, S-150 solvent oil 20%, and the balance is highly saturated methyl oleate; 4) Sulfonesulfuron 3.0%, Quizalofop-Ph-ethyl 10%, makeup copolymer 2.0%, emulsifier OF-803L 18.0%, stabilizer sodium benzoate 1.5%, fumed hydrophobic silica 2.0%, organic bentonite 1.0%, S-150 solvent oil 20%, and the balance is highly saturated methyl oleate.

[0017] The present invention also provides a method for preparing the above-mentioned dispersible oil suspension, comprising the following steps: S1, adding the sulfamethoxam, quizalofop-p-ethyl, dispersant, emulsifier, thickener, stabilizer and medium oil into the reactor in proportion, shearing at high speed and stirring evenly; S2. Grind the mixed solution in step S1 to a particle size of D50 = 1-4 μm by wet grinding to obtain a dispersible oil suspension.

[0018] In the above-mentioned preparation method, in step S1, the rotation speed of the high-speed shearing is 8000-10000 r / min.

[0019] In the above preparation method, in step S2, the rotation speed of the wet grinding is 1300-1500 r / min; and the cooling temperature of the sand mill is controlled at 0-10°C.

[0020] The present invention has the following beneficial effects: (1) The present invention uses sodium benzoate or tannic acid as a stabilizer, and the decomposition rates of sulfamethoxam and quizalofop-p-ethyl in the dispersible oil suspension are both low; (2) The dispersible oil suspension of the present invention is in good physical state after being cold stored at 0°C for 7 days and hot stored at 54°C for 14 days, without thixotropy or solidification, and has good long-term storage stability at room temperature; (3) The raw materials used in the present invention are all conventional chemical raw materials, which can be purchased through normal channels, and there are sufficient suppliers, so there will be no supply interruption problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a photo of the sample of Example 1 after the low temperature stability and heat storage stability tests were completed.

[0022] Figure 2 This is a photo of the sample of Example 2 after the low temperature stability and hot storage stability tests were completed.

[0023] Figure 3 This is a photo of the sample in Example 3 after the low temperature stability and heat storage stability tests were completed.

[0024] Figure 4 This is a photo of the sample of Example 4 after the low temperature stability and hot storage stability tests were completed.

[0025] Figure 5This is a photo of the sample of Comparative Example 1 after the low temperature stability and hot storage stability tests were completed.

[0026] Figure 6 This is a photo of the sample of Comparative Example 2 after the low temperature stability and hot storage stability tests were completed.

[0027] Figure 7 This is a photo of the sample of Comparative Example 3 after the low temperature stability and hot storage stability tests were completed.

[0028] Figure 8 This is a photo of the sample of Comparative Example 4 after the low temperature stability and hot storage stability tests were completed.

[0029] Remark: Figure 1-Figure 8 All of them are photos of the samples taken together with the hot storage stability test samples after the low-temperature stability test was completed and the samples were placed at room temperature for 7 days; the left ones are the low-temperature stability samples, and the right ones are the hot storage stability samples. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific embodiments. The given examples are only for illustrating the present invention, but not for limiting the scope of the present invention.

[0031] The experimental methods in the following examples are all conventional methods unless otherwise specified.

[0032] Unless otherwise specified, the materials and reagents used in the following examples can be obtained from commercial sources.

[0033] Example 1: Preparation of 2.5% sulfamethoxam + 8.5% quizalofop-p-ethyl dispersible oil suspension Calculated by mass percentage, weigh 2.5% of sulfasulfuron-methyl technical (Jiangsu Ruibang Agrochemical Co., Ltd., 98% sulfasulfuron technical), weigh 8.5% of quizalofop-ethyl technical (Jiangsu Fengshan Group Co., Ltd., 97% quizalofop-ethyl technical), dispersant SP-OF3498D: 2.0% (polycarboxylate, Jiangsu Qingyu Chemical Technology Co., Ltd.), emulsifier VE / 10: 18.0% (compound emulsifier, Suzhou Rongyida Chemical Co., Ltd.), stabilizer tannic acid 1.5% (98%, Shanghai MacLean Biochemical Technology Co., Ltd.), thickener 1: white carbon black R-974 1.0% (fumed hydrophobic silica, EVONIC), thickener 2: organic bentonite SK-04 1.5% (organic bentonite, Suzhou Zhongcai Mineral Materials Co., Ltd.), medium oil 1: S-150 solvent oil 10% (aromatic solvent oil, Pengchen New Materials Technology Co., Ltd.), medium oil 2: rapeseed oil made up to 100% (rapeseed oil, Suzhou Fengbei Biotechnology Co., Ltd.).

[0034] The preparation method of the dispersible oil suspension is as follows: (1) Add sulfonesulfuron technical, quizalofop-p-ethyl technical, dispersant SP-OF3498D, emulsifier VE / 10, stabilizer tannic acid, thickener white carbon black R-974, thickener organic bentonite SK-04, medium oil S-150 solvent oil and rapeseed oil into the reactor in the above proportions, and shear at high speed (8000~10000r / min, shearing for 10min) and stir evenly; (2) Grind the mixed solution in step (1) by wet grinding (sand mill speed 1500 r / min, cooling temperature controlled at 0°C) to a particle size D50 = 1-4 μm to obtain a 2.5% sulfamethoxam + 8.5% quizalofop-p-ethyl dispersible oil suspension.

[0035] The quality technical indicators of the 2.5% sulfamethoxam-methyl + 8.5% quizalofop-p-ethyl dispersible oil suspension prepared in Example 1 are shown in Table 1. It can be seen that all indicators are good.

[0036] Table 1 Quality Technical Specifications of 2.5% Sulfonamide + 8.5% Quizalofop-p-ethyl Dispersible Oil Suspension

[0037] Example 2: Preparation of 3% sulfamethoxam + 10% quizalofop-p-ethyl dispersible oil suspension Calculated by mass percentage, weigh 3.0% of sulfasulfuron-methyl technical (Jiangsu Ruibang Agrochemical Co., Ltd., 98% sulfasulfuron technical), 10.0% of quizalofop-ethyl technical (Jiangsu Fengshan Group Co., Ltd., 97% quizalofop-ethyl technical), dispersant SP-OF3498D: 2.0% (polycarboxylate, Jiangsu Qingyu Chemical Technology Co., Ltd.), emulsifier VE / 10: 18.0% (compound emulsifier, Suzhou Rongyida Chemical Co., Ltd.), stabilizer tannic acid 1.5% (98%, Shanghai MacLean Biochemical Technology Co., Ltd.), thickener 1: white carbon black R-974 1.0% (fumed hydrophobic silica, EVONIC), thickener 2: organic bentonite SK-04 1.0% (organic bentonite, Suzhou Zhongcai Mineral Materials Co., Ltd.), medium oil 1: S-150 solvent oil 10% (aromatic solvent oil, Pengchen New Materials Technology Co., Ltd.) Medium oil 2: rapeseed oil made up to 100% (rapeseed oil, Suzhou Fengbei Biotechnology Co., Ltd.).

[0038] The preparation method of the dispersible oil suspension is as follows: (1) Add sulfonesulfuron technical, quizalofop-p-ethyl technical, dispersant SP-OF3498D, emulsifier VE / 10, stabilizer tannic acid, thickener white carbon black R-974, thickener organic bentonite SK-04, medium oil S-150 solvent oil and rapeseed oil into the reactor in the above proportions, and shear at high speed (8000~10000r / min, shearing for 10min) and stir evenly; (2) Grind the mixed solution in step S1 by wet grinding (sand mill speed 1500 r / min, cooling temperature controlled at 0°C) to a particle size D50 = 1-4 μm to obtain a 3% sulfamethoxam + 10% quizalofop-p-ethyl dispersible oil suspension.

[0039] The quality technical indicators of the 3% sulfamethoxam + 10% quizalofop-p-ethyl dispersible oil suspension prepared in Example 2 are shown in Table 2. It can be seen that all indicators are good.

[0040] Table 2 Quality Technical Specifications of 3% Sulfonamide + 10% Quizalofop-p-ethyl Dispersible Oil Suspension

[0041] Example 3: Preparation of 2.5% sulfamethoxam + 8.5% quizalofop-p-ethyl dispersible oil suspension In terms of mass percentage, weigh 2.5% of sulfasulfuron-methyl technical (Jiangsu Ruibang Agrochemical Co., Ltd., 98% sulfasulfuron technical), weigh 8.5% of quizalofop-ethyl technical (Jiangsu Fengshan Group Co., Ltd., 97% quizalofop-ethyl technical), dispersant Atlox™ 4916: 2.0% (comb copolymer, CRODA), emulsifier OF-803L: 18.0% (compound emulsifier, Nanjing Yangzi Hongliyuan Chemical Co., Ltd.), stabilizer sodium benzoate 1.5% (98%, Shanghai MacLean Biochemical Technology Co., Ltd.), thickener 1: white carbon black R-974 2.0% (fumed hydrophobic silica, EVONIC), thickener 2: organic bentonite SK-042.0% (organic bentonite, Suzhou Zhongcai Mineral Materials Co., Ltd.), medium oil 1: S-150 solvent oil 20% (aromatic solvent oil, Pengchen New Materials Technology Co., Ltd.) Medium oil 2: high saturated methyl oleate made up to 100% (methyl oleate, Suzhou Fengbei Biotechnology Co., Ltd.).

[0042] The preparation method of the dispersible oil suspension is as follows: (1) Add sulfonesulfuron technical, quizalofop-p-ethyl technical, dispersant Atlox™ 4916, emulsifier OF-803L, stabilizer sodium benzoate, thickener white carbon black R-974, thickener organic bentonite SK-04, medium oil S-150 solvent oil and highly saturated methyl oleate into the reactor in the above proportions, and shear at high speed (8000~10000r / min, shearing for 10min) and stir evenly; (2) Grind the mixed solution in step S1 to a particle size D50 = 1-4 μm by wet grinding (sand mill speed 1500 r / min, cooling temperature controlled at 0°C) to obtain a 2.5% sulfamethoxam + 8.5% quizalofop-p-ethyl dispersible oil suspension concentrate.

[0043] The quality technical indicators of the 2.5% sulfamethoxam-methyl + 8.5% quizalofop-p-ethyl dispersible oil suspension prepared in Example 3 are shown in Table 3. It can be seen that all indicators are good.

[0044] Table 3 Quality Technical Specifications of 2.5% Sulfonamide + 8.5% Quizalofop-p-ethyl Dispersible Oil Suspension

[0045] Example 4: Preparation of 3% sulfamethoxam + 10% quizalofop-p-ethyl dispersible oil suspension In terms of mass percentage, 3.0% of sulfasulfuron-methyl technical (Jiangsu Ruibang Agrochemical Co., Ltd., 98% sulfasulfuron technical), 10% of quizalofop-ethyl technical (Jiangsu Fengshan Group Co., Ltd., 97% quizalofop-ethyl technical), 2.0% of dispersant Atlox™ 4916 (comb copolymer, CRODA), 18.0% of emulsifier OF-803L (compound emulsifier, Nanjing Yangzi Hongliyuan Chemical Co., Ltd.), 1.5% of stabilizer sodium benzoate (98%, Shanghai MacLean Biochemical Technology Co., Ltd.), and thickener 1: white carbon black R-974 were weighed. 2.0% (fumed hydrophobic silica, EVONIC), thickener 2: organic bentonite SK-041.0% (organic bentonite, Suzhou Zhongcai Mineral Materials Co., Ltd.), medium oil 1: S-150 solvent oil 20% (aromatic solvent oil, Pengchen New Materials Technology Co., Ltd.) Medium oil 2: highly saturated methyl oleate made up to 100% (methyl oleate, Suzhou Fengbei Biotechnology Co., Ltd.).

[0046] The preparation method of the dispersible oil suspension is as follows: (1) Add sulfonesulfuron technical, quizalofop-p-ethyl technical, dispersant Atlox™ 4916, emulsifier OF-803L, stabilizer sodium benzoate, thickener white carbon black R-974, thickener organic bentonite SK-04, medium oil S-150 solvent oil and highly saturated methyl oleate into the reactor in proportion, and shear at high speed (8000~10000r / min, shear for 10min) and stir evenly; (2) Grind the mixed solution in step S1 by wet grinding (sand mill speed 1500 r / min, cooling temperature controlled at 0°C) to a particle size D50 = 1-4 μm to obtain a 3% sulfamethoxam + 10% quizalofop-p-ethyl dispersible oil suspension.

[0047] The quality technical indicators of the 3% sulfamethoxam + 10% quizalofop-p-ethyl dispersible oil suspension prepared in Example 4 are shown in Table 4. It can be seen that all indicators are good.

[0048] Table 4 Quality Technical Specifications of 3% Sulfonamide + 10% Quizalofop-Ph-ethyl Dispersible Oil Suspension

[0049] In the preparation of the dispersible oil suspension containing sulfamethoxam and quizalofop-p-ethyl, the selection of various raw material components is crucial to the successful preparation of dispersible oil suspension with stable chemical and physical properties. Therefore, we screened and compared a variety of raw materials, and only some of the conditions are listed below.

[0050] Comparative Example 1 The medium oil S-150 in Example 1 was removed, and only rapeseed oil was used as the medium oil, while the other components and preparation methods remained unchanged. As a result, the sample solidified in the low temperature stability test, and the sample was thixotropic in the hot storage stability test. Figure 5 .

[0051] Comparative Example 2 The emulsifier in Example 3 was changed to OF-803S: 18.0% (compound emulsifier, Nanjing Yangzi Hongliyuan Chemical Co., Ltd.), and the other formula composition and preparation method remained unchanged. The decomposition rate of sulfamethoxam was 8.52%, and the decomposition rate of quizalofop-p-ethyl was 3.24%. Figure 6 .

[0052] Comparative Example 3 The stabilizer tannic acid in Example 1 was replaced with: 0.8% urea + 0.5% BHT, the decomposition rate of sulfamethoxam was 8.94%, and the decomposition rate of quizalofop-p-ethyl was 0.42%; see Figure 7 .

[0053] Comparative Example 4 The stabilizer sodium benzoate in Example 3 was replaced with: 0.8% urea + 0.5% BHT, the decomposition rate of sulfamethoxam was 9.72%, and the decomposition rate of quizalofop-p-ethyl was 0.52%; see Figure 8 .

Claims

1. A dispersible oil suspension containing sulfasulfuron-methyl and quizalofop-p-ethyl, which is made of the following components in percentage by weight: Sulfonsulfuron 0~5%, Quizalofop-Ph-ethyl 5%~10%, dispersant 1%~5%, emulsifier 10%~20%, thickener 1%~5%, stabilizer 1%~5%, and the balance is medium oil; among which, The content of sulfasulfuron-methyl is not zero; The stabilizer is sodium benzoate and / or tannic acid.

2. The dispersible oil suspension according to claim 1, characterized in that: The dispersant is at least one of polycarboxylate and comb copolymer.

3. The dispersible oil suspension according to claim 1 or 2, characterized in that: The emulsifier is any one of Geronol® VO / 01 (vegetable oil emulsifier), Geronol® VO / 02N (methyl oleate emulsifier) ​​of Solvay Investment Co., Ltd., OF-803L (methyl oleate emulsifier) ​​of Nanjing Yangzi Hongliyuan Chemical Co., Ltd., and VE / 10 (vegetable oil emulsifier) ​​of Suzhou Rongyida Chemical Co., Ltd.

4. The dispersible oil suspension according to any one of claims 1 to 3, characterized in that: The thickener is at least one of fumed hydrophobic silica and organic bentonite.

5. The dispersible oil suspension according to any one of claims 1 to 4, characterized in that: The medium oil is S-150 solvent oil and any one of the following: soybean oil, corn oil, rapeseed oil, high saturated oleic acid methyl ester and S-200 solvent oil.

6. The dispersible oil suspension according to any one of claims 1 to 5, characterized in that: The thickener is fumed hydrophobic white carbon black and organic bentonite; The medium oil is any one of the following: 1) S-150 solvent oil and rapeseed oil; 2) S-150 solvent oil and highly saturated methyl oleate.

7. The dispersible oil suspension according to claim 6, characterized in that: The mass ratio of the fumed hydrophobic silica to the organic bentonite is 1:2 to 2:1; Based on the total mass of the dispersible oil suspension, the mass percentage of the S-150 solvent oil is 10% to 30%.

8. A method for preparing a dispersible oil suspension according to any one of claims 1 to 7, comprising the steps of: S1, adding the sulfamethoxam, quizalofop-p-ethyl, dispersant, emulsifier, thickener, stabilizer and medium oil into the reactor in proportion, shearing at high speed and stirring evenly; S2. Grind the mixed solution in step S1 to a particle size of D50 = 1-4 μm by wet grinding to obtain a dispersible oil suspension.

9. The preparation method according to claim 8, characterized in that: In step S1, the rotation speed of the high-speed shearing is 8000-10000 r / min.

10. The preparation method according to claim 8 or 9, characterized in that: In step S2, the rotation speed of the wet grinding is 1300-1500 r / min; and the cooling temperature of the sand mill is controlled at 0-10°C.

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