Preparation method of micro-capsule suspending agent containing s-metolachlor and flumetsulam

Abstract

The invention relates to the technical field of pesticide preparation, and provides a preparation method of a micro-capsule suspending agent containing s-metolachlor and flumetsulam, and the preparation method comprises the following steps: S1, preparing flumetsulam into a flumetsulam suspension, and then mixing an emulsifier, the flumetsulam suspension and water to obtain a solution A; s2, mixing the oil-phase wall material, s-metolachlor and an organic solvent to obtain a solution B, and mixing the water-phase wall material and water to obtain a solution C; s3, dropwise adding the solution B in the step S2 into the solution A, and shearing while stirring in the dropwise adding process; and S4, continuously dropwise adding the solution C after dropwise adding the solution B in the step S3, and stirring in the dropwise adding process to obtain the stable s-metolachlor and flumetsulam microcapsule suspending agent.

Description

Technical Field

[0001] The present invention relates to the technical field of pesticide preparation, and specifically, to a preparation method of a microcapsule suspension containing S-metolachlor and flumetsulam. Background Art

[0002] S-metolachlor is a selective acetanilide herbicide. Based on metolachlor, S-metolachlor is a refined active S-isomer obtained by successfully removing the inactive R-isomer using advanced technology. Besides having the advantages of metolachlor, S-metolachlor is superior to metolachlor in terms of safety and control effect. S-metolachlor has a wide range of applicable crops and is the main herbicide for important food crops such as corn and sorghum in the world; flumetsulam belongs to the class of triazolopyrimidine sulfonamides. Flumetsulam is a typical acetolactate synthase inhibitor. It inhibits the synthesis of branched-chain amino acids, blocking protein synthesis, thereby causing the plant to stop growing. It has the characteristics of a long residual period and a wide herbicide spectrum and is suitable for soil and foliar treatment.

[0003] Currently, the microcapsule suspension technology can encapsulate pesticides and suspend them in water. It is a new type of pesticide formulation with a long effective period, less organic solvent, and less harm to operators. In order to improve the application effect, S-metolachlor and flumetsulam can be prepared into a mixed microcapsule suspension. Currently, in the preparation of a mixed microcapsule suspension mainly containing S-metolachlor, generally, a microcapsule suspension containing lipophilic components is first prepared, and then another active ingredient is prepared into a suspension. The microcapsule suspension and the suspension are mixed to prepare a microcapsule suspension-suspension. However, this method has certain technical defects:

[0004] Among them, during the preparation, it is necessary to monitor the capsule formation situation in the first capsule formation stage and also monitor the capsule formation situation after mixing with the suspension. The preparation steps are cumbersome, and many monitoring links are required. In the actual production process, not only is the preparation process long, but also a lot of manpower and material resources are consumed. In view of this, the present invention proposes a preparation method of a microcapsule suspension containing S-metolachlor and flumetsulam. Summary of the Invention

[0005] The present invention proposes a preparation method of a microcapsule suspension containing S-metolachlor and flumetsulam, which solves the problem of the cumbersome preparation process of the microcapsule suspension of S-metolachlor and flumetsulam in the prior art.

[0006] The technical solution of the present invention is as follows: A preparation method of a microcapsule suspension containing S-metolachlor and flumetsulam, characterized by including the following steps:

[0007] S1: Prepare flumetsulam into a flumetsulam suspension, and then mix an emulsifier, the flumetsulam suspension, and water to obtain solution A;

[0008] S2: Mix the oil-phase wall material, S-metolachlor, and the organic solvent to obtain Solution B, and then mix the water-phase wall material and water to obtain Solution C;

[0009] S3: Drop Solution B in S2 into Solution A, and during the dropping process, stir and shear simultaneously;

[0010] S4: After dropping Solution B in S3, continue to drop Solution C, and stir during the dropping process to obtain a stable microcapsule suspension of S-metolachlor and flumetsulam.

[0011] Preferably, in S1, the specific preparation process of the flumetsulam suspension is as follows:

[0012] (1). Mix flumetsulam, a dispersant, an organic solvent, and water, and fully stir and disperse to obtain a mixture, wherein the stirring speed is 80 - 120 revolutions per minute and the time is 15 - 20 minutes;

[0013] (2). Grind the above mixed solution through a sand mill to grind the mixture to a particle size of 2 - 3 microns to obtain a stable flumetsulam suspension.

[0014] Preferably, the weight ratio of flumetsulam, the dispersant, the organic solvent, and water is (1 - 20):(1 - 6):1:(1 - 10).

[0015] Preferably, during the preparation process of the flumetsulam suspension, the dispersant is one or more of polyvinylpyrrolidone, sodium polyacrylate, and polycarboxylate, and the organic solvent is one or more of toluene, xylene, methyl oleate, and solvent oil.

[0016] Preferably, in S1, the emulsifier is one or more of sodium lignosulfonate, sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, styrene - maleic anhydride copolymer, fatty alcohol polyoxyethylene ether, and sorbitan polyoxyethylene polyoxypropylene ether.

[0017] Preferably, the ratio of the emulsifier, the flumetsulam suspension, and water in Solution A is 1:(1 - 10):(1 - 8), the ratio of the oil-phase wall material, S-metolachlor, and the organic solvent in Solution B is 1:(1 - 30):(1 - 4), and the ratio of the water-phase wall material and water in Solution C is 1:(8 - 9).

[0018] Preferably, the oil-phase wall material is one or more of monoisocyanates, diisocyanates, and polyisocyanates, the water-phase wall material is one or more of ethylenediamine, propyltriamine, triethylenetetramine, and triethylenediamine, and the organic solvent is one or more of ethyl acetate, methyl oleate, xylene, and solvent oil.

[0019] Preferably, in S3, the shearing condition is 2,600 - 3,000 revolutions per minute, and the stirring condition is 200 - 240 revolutions per minute.

[0020] Preferably, in S4, the stirring condition is 240 - 280 revolutions per minute, and the stirring time is 50 - 60 minutes.

[0021] The working principle and beneficial effects of the present invention are as follows: In the present invention, by preparing flumetsulam into a flumetsulam suspension, mixing it with an emulsifier to obtain solution A, and then sequentially adding solution B containing an oil-phase wall material and an active ingredient and solution C containing a water-phase wall material, a mixed microcapsule suspension containing two active ingredients is directly prepared, simplifying the preparation process of the mixed microcapsule suspension and effectively reducing the preparation cost; BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0023] Figure 1 It is a table of the thermal storage stability and low-temperature stability of the microcapsule suspensions of S-metolachlor and flumetsulam in each group in Test Example 1 of the present invention;

[0024] Figure 2 It is a table of the plant control efficacy of each treatment area in different time periods in Test Example 2 of the present invention. SPECIFIC EMBODIMENTS

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

[0026] The embodiments of the present invention utilize the synergistic effect of S-metolachlor and flumetsulam to prepare a microcapsule suspension containing S-metolachlor and flumetsulam, which at least includes the following steps:

[0027] S1: Prepare a flumetsulam suspension from flumetsulam, and then mix an emulsifier, the flumetsulam suspension, and water to obtain solution A;

[0028] S2: Mix an oil-phase wall material, S-metolachlor, and an organic solvent to obtain solution B, and then mix a water-phase wall material and water to obtain solution C;

[0029] S3: Drop solution B in S2 into solution A, and shear while stirring during the dropping process;

[0030] S4: After the addition of Solution B in S3 is completed, continue to add Solution C while stirring during the addition process to obtain a stable microcapsule suspension of S-metolachlor and flumetsulam.

[0031] In the present invention, by preparing flumetsulam into a flumetsulam suspension, mixing it with an emulsifier to obtain Solution A, and then sequentially adding Solution B containing an oil-phase wall material and an active ingredient and Solution C containing an aqueous-phase wall material, a mixed microcapsule suspension containing two active ingredients is directly prepared, simplifying the preparation process of the mixed microcapsule suspension and effectively reducing the preparation cost.

[0032] Furthermore, in S1, the specific preparation process of the flumetsulam suspension is as follows:

[0033] (1) Mix flumetsulam, a dispersant, an organic solvent, and water, and fully stir and disperse to obtain a mixture. Among them, the stirring speed is 80 - 120 revolutions per minute, and the time is 15 - 20 minutes;

[0034] (2) Grind the above mixed solution through a sand mill to grind the mixture to a particle size of 2 - 3 microns to obtain a stable flumetsulam suspension.

[0035] Furthermore, the weight ratio of flumetsulam, the dispersant, the organic solvent, and water is (1 - 20):(1 - 6):1:(1 - 10).

[0036] Furthermore, during the preparation process of the flumetsulam suspension, the dispersant is one or more of polyvinylpyrrolidone, sodium polyacrylate, and polycarboxylate, and the organic solvent is one or more of toluene, xylene, methyl oleate, and solvent oil.

[0037] Furthermore, in S1, the emulsifier is one or more of sodium lignosulfonate, sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, styrene - maleic anhydride copolymer, fatty alcohol polyoxyethylene ether, and sorbitan polyoxyethylene polyoxypropylene ether.

[0038] Furthermore, the ratio of the emulsifier, the flumetsulam suspension, and water in Solution A is 1:(1 - 10):(1 - 8), the ratio of the oil-phase wall material, S-metolachlor, and the organic solvent in Solution B is 1:(1 - 30):(1 - 4), and the ratio of the aqueous-phase wall material and water in Solution C is 1:(8 - 9).

[0039] Furthermore, in S2, the oil-phase wall material is one or more of monoisocyanates, diisocyanates, and polyisocyanates, the aqueous-phase wall material is one or more of ethylenediamine, propyltriamine, triethylenetetramine, and triethylenediamine, and the organic solvent is one or more of ethyl acetate, methyl oleate, xylene, and solvent oil.

[0040] Further, in S3, the shearing condition is 2,600 - 3,000 revolutions per minute, and the stirring condition is 200 - 240 revolutions per minute.

[0041] Further, in S4, the stirring condition is 240 - 280 revolutions per minute, and the stirring time is 50 - 60 minutes.

[0042] Example 1:

[0043] A method for a microcapsule suspension containing S-metolachlor and flumetsulam, comprising the following steps:

[0044] S1: Mix 40 wt% of flumetsulam, 5 wt% of polyvinylpyrrolidone, 2 wt% of solvent oil, and 20 wt% of water, and stir and disperse thoroughly to obtain a mixture. Among them, the stirring speed is 80 revolutions per minute, and the time is 15 minutes. Then, grind the above mixed solution through a sand mill to grind the mixture to a particle size of 3 microns to obtain a stable flumetsulam suspension;

[0045] Then mix sodium lignosulfonate, the flumetsulam suspension, and water to obtain solution A. The ratio of sodium lignosulfonate, the flumetsulam suspension, and water in solution A is 1:10:8;

[0046] S2: Mix monoisocyanate, S-metolachlor, and xylene to obtain solution B. The ratio of monoisocyanate, S-metolachlor, and xylene in solution B is 1:30:4;

[0047] Then mix ethylenediamine and water to obtain solution C. The ratio of ethylenediamine and water in solution C is 1:8;

[0048] S3: Drop solution B in S2 into solution A, and shear while stirring during the dropping process. The shearing condition is 3,000 revolutions per minute, and the stirring condition is 200 revolutions per minute;

[0049] S4: After dropping solution B in S3, continue to drop solution C, and stir during the dropping process. The stirring condition is 240 revolutions per minute, and the stirring time is 20 minutes to obtain a stable microcapsule suspension of S-metolachlor and flumetsulam.

[0050] Then add sodium hydroxide solution and stir to mix. The stirring speed is 240 revolutions per minute, adjust the pH value of the system to neutral, and finally add sodium polyacrylate and magnesium aluminum silicate and stir to mix evenly. The stirring speed is 180 revolutions per minute to obtain a stable microcapsule suspension of S-metolachlor and flumetsulam.

[0051] Example 2:

[0052] A method for a microcapsule suspension containing S-metolachlor and flumetsulam, comprising the following steps:

[0053] S1: 40 wt% of flumetsulam, 5 wt% of polyvinyl pyrrolidone, 2 wt% of solvent oil and 20 wt% of water are mixed, and the mixture is fully stirred and dispersed, wherein the stirring speed is 80 rpm for 15 minutes, and the mixed solution is then ground into a particle size of 3 μm by a sand mill to obtain a stable flumetsulam suspension;

[0054] Then, sodium lauryl sulfate, flumetsulam suspension and water are mixed to obtain solution A, wherein the ratio of sodium lauryl sulfate, flumetsulam suspension and water in solution A is 1:8:6;

[0055] S2: diisocyanate, S-isopropylamine and ethyl acetate are mixed to obtain solution B, wherein the ratio of diisocyanate, S-isopropylamine and ethyl acetate in solution B is 0.5:20:2;

[0056] Then, propylenetriamine and water are mixed to obtain solution C, wherein the ratio of propylenetriamine to water in solution C is 1:8.5;

[0057] S3: Add solution B in S2 dropwise to solution A, stirring and shearing during the dropping process, the shearing condition is 2600 rpm, and the stirring condition is 220 rpm;

[0058] S4: After the solution B in S3 is added dropwise, solution C is added dropwise with stirring during the addition process. The stirring condition is 260 rpm and the stirring time is 16 minutes to obtain a stable microcapsule suspension of S-isopropylamine and flumetsulam.

[0059] Embodiment three:

[0060] A method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor comprises the following steps:

[0061] S1: 40 wt% of flumetsulam, 5 wt% of polyvinyl pyrrolidone, 2 wt% of solvent oil and 20 wt% of water are mixed, and the mixture is fully stirred and dispersed, wherein the stirring speed is 80 rpm for 15 minutes, and the mixed solution is then ground into a particle size of 3 μm by a sand mill to obtain a stable flumetsulam suspension;

[0062] Then, sodium dodecylbenzenesulfonate, azopyralid suspension and water are mixed to obtain solution A, wherein the ratio of sodium dodecylbenzenesulfonate, azopyralid suspension and water in solution A is 1:7:5;

[0063] S2: polyisocyanate, S-isopropylamine and methyl oleate are mixed to obtain solution B, wherein the ratio of polyisocyanate, S-isopropylamine and methyl oleate in solution B is 1:20:3; triethylenetetramine and water are mixed to obtain solution C, wherein the ratio of propylenetriamine and water in solution C is 1:9;

[0064] S3: Add solution B in S2 dropwise into solution A, stirring and shearing during the dropping process, the shearing condition is 2800 rpm, and the stirring condition is 230 rpm;

[0065] S4: After the solution B in S3 is added dropwise, solution C is added dropwise with stirring during the addition process. The stirring condition is 280 rpm and the stirring time is 15 minutes to obtain a stable microcapsule suspension of S-isopropylamine and flumetsulam.

[0066] Embodiment 4:

[0067] A method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor comprises the following steps:

[0068] S1: 40 wt% of flumetsulam, 5 wt% of polyvinyl pyrrolidone, 2 wt% of solvent oil and 20 wt% of water are mixed, and the mixture is fully stirred and dispersed, wherein the stirring speed is 80 rpm for 15 minutes, and the mixed solution is then ground into a particle size of 3 μm by a sand mill to obtain a stable flumetsulam suspension;

[0069] Then, the styrene-maleic anhydride copolymer, the flumetsulam suspension and water are mixed to obtain a solution A, wherein the ratio of the styrene-maleic anhydride copolymer, the flumetsulam suspension and water in the solution A is 1:8:6;

[0070] S2: monoisocyanate, S-isopropylamine and xylene are mixed to obtain solution B, wherein the ratio of polyisocyanate, S-isopropylamine and xylene in solution B is 1:15:3; triethylenediamine and water are mixed to obtain solution C, wherein the ratio of triethylenediamine and water in solution C is 1:8.5;

[0071] S3: Add solution B in S2 dropwise to solution A, stirring and shearing during the dropping process, the shearing condition is 3000 rpm, and the stirring condition is 240 rpm;

[0072] S4: After the solution B in S3 is added dropwise, solution C is added dropwise with stirring during the addition process. The stirring condition is 280 rpm and the stirring time is 18 minutes to obtain a stable microcapsule suspension of S-isopropylamine and flumetsulam.

[0073] Comparative Example 1:

[0074] The preparation method of this comparative example is basically the same as that of Example 1, except for the order of adding solution B and solution C. The specific steps are as follows:

[0075] First, solution A, solution B and solution C were prepared according to the method of Example 1;

[0076] Then, solution C was added dropwise to solution A, with stirring during the addition process. The stirring condition was 240 rpm and the stirring time was 20 minutes.

[0077] Solution B was then added dropwise to the mixture of solution A and solution C, with stirring and shearing during the dropping process. The shearing condition was 3000 rpm and the stirring condition was 200 rpm, to obtain a stable microcapsule suspension of S-isopropylamine and flumetsulam.

[0078] Comparative Example 2:

[0079] The only difference from Example 1 is that xylene is not used in the process of preparing solution B, and solution B is obtained directly by mixing monoisocyanate and S-isopropylamine, and the ratio of monoisocyanate to S-isopropylamine in solution B is 1:30.

[0080] Comparative Example 3:

[0081] The only difference from Example 1 is that solution B is added dropwise into solution A, and only stirring is started without shearing, and the stirring speed is 200 rpm.

[0082] Comparative Example 4:

[0083] The only difference from Example 1 is that solution B is added dropwise into solution A, and only shearing is started without stirring, and the shearing speed is 3000 rpm.

[0084] Comparative Example 5:

[0085] The only difference from Example 1 is that the method of Reference Example 1 only prepares a suspension of flumetsulam, and the specific steps are:

[0086] 40 wt% of flumetsulam, 5 wt% of polyvinyl pyrrolidone, 2 wt% of solvent oil and 20 wt% of water were mixed, and the mixture was fully stirred and dispersed, wherein the stirring speed was 80 rpm for 15 minutes, and the mixed solution was then passed through a sand mill to grind the mixture to a particle size of 3 microns to obtain a stable flumetsulam suspension.

[0087] Comparative Example 6:

[0088] The only difference from Example 1 is that the method of Reference Example 1 only prepares S-isopropylamine microcapsule suspension, and the specific steps are:

[0089] (1) Mix the monoisocyanate, S-metolachlor, and xylene to obtain Solution B, where the ratio of monoisocyanate, S-metolachlor, and xylene in Solution B is 1:30:4;

[0090] (2) Then mix ethylenediamine and water to obtain Solution C, where the ratio of ethylenediamine and water in Solution C is 1:8;

[0091] (3) Drop Solution C into Solution B, and during the dropping process, stir and shear simultaneously. The shearing condition is 3000 revolutions per minute, and the stirring condition is 200 revolutions per minute to obtain the S-metolachlor microcapsule suspension.

[0092] Test Example 1:

[0093] This test example is used to test the thermal storage stability and low-temperature stability of the S-metolachlor and flumetsulam microcapsule suspensions obtained in Example 1, Example 2, Example 3, Example 4, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4;

[0094] Among them, the specific steps for the thermal storage stability test are as follows: Put the S-metolachlor and flumetsulam microcapsule suspensions obtained in Example 1, Example 2, Example 3, Example 4, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 into containers respectively, seal them and place them in a constant-temperature oven at (54 ± 2) °C. After standing for 14 days, take them out and determine the suspension rate according to the GB / T14825-2006 standard. The results are as Figure 1 shown;

[0095] The specific steps for the low-temperature stability determination are as follows: Put the S-metolachlor and flumetsulam microcapsule suspensions obtained in Example 1, Example 2, Example 3, Example 4, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 into containers respectively, seal them and place them in a refrigerator at (0 ± 2) °C for 1 h, stir once every 15 min for 15 s each time, observe whether there is any change in appearance, continue to place them at (0 ± 2) °C for 7 days, then take them out and place them at room temperature to stand and recover, and determine the suspension rate according to the GB / T14825-2006 standard. The results are as Figure 1 shown;

[0096] It can be seen from Figure 1 that the S-metolachlor and flumetsulam microcapsule suspensions provided by the present invention have good thermal storage stability and low-temperature storage stability.

[0097] Test Example 2:

[0098] This test example is used to test the control effects of the medicaments obtained in Example 1, Example 2, Example 3, Example 4, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, Comparative Example 5, and Comparative Example 6 on Abutilon theophrasti and Chenopodium album in corn fields. Before the test, each medicament was diluted with distilled water to an aqueous solution with an effective active ingredient concentration of 0.1 wt%.

[0099] Experimental site: Changchun City, Jilin Province. The terrain of this plot is flat and the fertility is good. The corn in each treated area after spraying is managed according to conventional production.

[0100] The specific spraying process of corn in each treated area is as follows:

[0101] First, use a knapsack sprayer to evenly spray the medicaments obtained in Example 1, Example 2, Example 3, Example 4, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, Comparative Example 5, and Comparative Example 6 on the corn fields in each planting area at a dosage of 30 g / mu before emergence after sowing, and set a clear water control.

[0102] Then, investigate the control effects of barnyard grass 10 days, 20 days, 30 days, and 50 days after spraying. The specific test method is carried out in accordance with the "Guidelines for Field Efficacy Trials of Pesticides". Each treated area adopts random 5-point sampling to investigate the control effects of Abutilon theophrasti and Chenopodium album plants in each treated area. At 10, 20, 30, and 50 days after spraying, identify and count the weeds, and calculate the plant control effect according to the following formula:

[0103]

[0104] Specific results Figure 2 。

[0105] It can be seen from Figure 2 that the microcapsule suspension of S-metolachlor and flumetsulam prepared by the preparation method provided by the present disclosure under specific reaction conditions such as stirring speed, emulsifying dispersant, and solvent can achieve the effect of slowly releasing and long-acting control of various weeds in crops.

[0106] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor, characterized in that: The steps include: S1: preparing a sulfamethoxam suspension from a sulfamethoxam, and then mixing an emulsifier, the sulfamethoxam suspension and water to obtain a solution A; S2: mixing the oil phase wall material, S-isopropylamine and the organic solvent to obtain solution B, and then mixing the water phase wall material and water to obtain solution C; S3: adding solution B in S2 dropwise to solution A, with stirring and shearing during the adding process; S4: After the solution B in S3 is added dropwise, the solution C is added dropwise, and stirring is performed during the adding process to obtain a stable microcapsule suspension of S-isopropylamine and flumetolachlor.

2. The method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor according to claim 1, characterized in that: In S1, the specific preparation process of the flumetsulam suspension is as follows: (1) mixing flumetsulam, a dispersant, an organic solvent and water, and fully stirring and dispersing to obtain a mixture, wherein the stirring speed is 80-120 rpm for 15-20 minutes; (2) Grind the mixed solution into a sand mill until the particle size is 2-3 μm to obtain a stable suspension of fluazifop.

3. The method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor according to claim 2, characterized in that: The weight ratio of the flumetsulam, dispersant, organic solvent and water is (1-20): (1-6): 1: (1-10).

4. The method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor according to claim 3, characterized in that: In the preparation process of the flumetsulam suspension, the dispersant is one or more of polyvinyl pyrrolidone, sodium polyacrylate, and polycarboxylate, and the organic solvent is one or more of toluene, xylene, methyl oleate, and solvent oil.

5. The method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor according to claim 1, characterized in that: In S1, the emulsifier is one or more of sodium lignin sulfonate, sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, styrene-maleic anhydride copolymer, fatty alcohol polyoxyethylene ether, and sorbitan polyoxyethylene polyoxypropylene ether.

6. The method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor according to claim 1, characterized in that: The ratio of the emulsifier, the flumetsulam suspension and water in the solution A is 1:(1-10):(1-8), the ratio of the oil phase wall material, S-isopropylamine and the organic solvent in the solution B is 1:(1-30):(1-4), and the ratio of the water phase wall material and water in the solution C is 1:(8-9).

7. The method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor according to claim 6, characterized in that: In S2, the oil phase wall material is one or more of monoisocyanate, diisocyanate, and polyisocyanate, the water phase wall material is one or more of ethylenediamine, propylenetriamine, triethylenetetramine, and triethylenediamine, and the organic solvent is one or more of ethyl acetate, methyl oleate, xylene, and solvent oil.

8. The method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor according to claim 1, characterized in that: In S3, the shearing condition is 2600-3000 rpm, and the stirring condition is 200-240 rpm.

9. The method for preparing a microcapsule suspension containing S-metolachlor and flumetolachlor according to claim 1, characterized in that: In S4, the stirring condition is 240-280 rpm, and the stirring time is 50-60 minutes.

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