Weeding composition based on metamifop and cyhalofop-butyl and preparation method thereof
By using a ternary compound of oxazolidinyl, cyhalofop-butyl, and bispyribac-sodium, the problems of insufficient control efficacy and resistance development of sedges and perennial broadleaf weeds in existing technologies have been solved, achieving highly efficient control of weeds such as barnyard grass and Echinochloa crus-galli.
Patent Information
- Application Number
- CN202510893764.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-30
- Publication Date
- 2025-10-31
AI Technical Summary
Existing technologies combining oxazolidinone and cyhalofop-butyl are insufficient in controlling sedges and perennial broadleaf weeds, and long-term use leads to the development of resistance, especially reducing the effectiveness against older barnyard grass and Echinochloa crus-galli.
The ternary compound system of oxazolidinone, cyhalofop-butyl, and bispyribac-sodium is used to achieve multi-target attack and metabolic interference inhibition through synergistic inhibition of target enzymes, synergistic absorption and transduction, and complementary action sequence, thereby blocking the synthesis of fatty acids and branched-chain amino acid metabolism in weeds.
It significantly improved the control efficacy against broadleaf weeds and sedges, slowed the development of resistant weeds, and enhanced the control effect against barnyard grass and Echinochloa crus-galli.
Abstract
Description
Technical Field
[0001] This invention belongs to the field of pesticide technology, specifically referring to a herbicidal composition based on oxazolidinyl and cyhalofop-butyl and its preparation method. Background Technology
[0002] Oxazosyl-methyl and cyhalofop-butyl both belong to the aryloxyphenoxypropionate class of herbicides, acting on acetyl-CoA carboxylase (ACCase), and are currently the core agents for controlling grassy weeds in rice paddies. However, existing compounding technologies have significant limitations: firstly, mainstream formulations are mostly limited to combinations of these two herbicides with a third component (such as cyclopyralid, pretilachlor, or chlorpyrifos); secondly, existing combinations are insufficiently effective against sedges and perennial broadleaf weeds; and thirdly, long-term use leads to the development of resistance, especially reducing effectiveness against older barnyard grass and Echinochloa crus-galli. Summary of the Invention
[0003] In order to overcome some of the problems mentioned in the background above, the present invention provides a herbicidal composition based on oxazolidinyl and cyhalofop-butyl to at least partially solve the above problems.
[0004] According to the technical solution of the present invention, a herbicidal composition based on oxazolidinyl and cyhalofop-butyl is provided, comprising the following raw materials in parts by weight: 10-14 parts of active ingredient, 60-70 parts of dispersion medium, 10-15 parts of emulsifier, 3-5 parts of dispersant, 1.5-2.5 parts of thickener, 1-2 parts of stabilizer, 3 parts of antifreeze agent and 0.5 parts of defoamer; The active ingredients include oxazolidinyl oxalic acid, cyhalofop-oxalic acid, and bispyribac-sodium; the dispersion medium includes methyl oleate and vegetable oil, wherein the vegetable oil includes one or more of soybean oil, rapeseed oil, peanut oil, and walnut oil.
[0005] Preferably, the mass ratio of oxazolidinyl oxalic acid, cyfluthrin and bispyribac-sodium in the active ingredients is 5:(5-8):(1-1.3).
[0006] Preferably, the dispersion medium comprises pretreated oil and mixed oil, wherein the volume ratio of the pretreated oil to the mixed oil is 4:6, the pretreated oil is pure methyl oleate, and the mixed oil comprises methyl oleate and vegetable oil.
[0007] Preferably, the mixed oil comprises methyl oleate and vegetable oil in a volume ratio of 7:3, wherein the vegetable oil is soybean oil.
[0008] Preferably, the emulsifier comprises castor oil polyoxyethylene ether and calcium alkylbenzene sulfonate in a volume ratio of 7:5, the thickener is modified organic bentonite, and the stabilizer is epoxidized soybean oil.
[0009] On the other hand, the present invention also provides a method for preparing a herbicidal composition based on oxazolidinone and cyhalofop-butyl, comprising the following steps: S1. Mix oxazolidinyl oxalic acid, cyanoxazone and bispyribac-sodium in a mass ratio of 5:(5-8):(1-1.3), add pretreated oil and epoxidized soybean oil and perform high-speed shear pre-dispersion treatment to form primary slurry; S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill, then transfer the slurry to a low-temperature mixing tank and add the mixed oil, emulsifier and dispersant in sequence while stirring. S3. Slowly add modified organic bentonite and stir evenly to adjust the viscosity, then add defoamer and antifreeze and stir evenly; S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
[0010] Furthermore, the high-speed shear pre-dispersion treatment involves stirring at 3000 rpm for 15 minutes. The horizontal grinding mill controls the material temperature to be below 40°C during the grinding process.
[0011] Furthermore, the low-temperature stirred tank is kept at a temperature of 15-20℃; The slurry is added to a low-temperature mixing vessel and stirred continuously at 600 rpm. First, 50% of the mixed oil is added slowly, and then the emulsifier is added simultaneously with the remaining mixed oil. After the mixed oil is added, the dispersant is added immediately.
[0012] Furthermore, the modified organic bentonite is pre-hydrated before being added. During the addition of the pre-hydrated modified organic bentonite, defoamer, and antifreeze, the low-temperature stirring tank is maintained at a speed of 600 rpm.
[0013] On the other hand, the present invention also provides an application of the herbicidal composition based on oxazolidinyl and cyhalofop-butyl, the application of the above-mentioned herbicidal composition based on oxazolidinyl and cyhalofop-butyl in the field of pesticides.
[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention introduces bispyribac-sodium as a third component to form a ternary compound system. Bispyribac-sodium is a pyrimidine salicylic acid herbicide, and its mechanism of action is that there is no cross-resistance between the acetolactate synthase ALS inhibitor and the pyruvate synthase ACCase inhibitor. This invention utilizes the synergistic effect of three components in a ternary compound system to simultaneously block fatty acid synthesis and branched-chain amino acid metabolism in weeds, resulting in a dual biochemical inhibitory effect. Bissodium can compensate for the weak efficacy of oxazolidinium and cyhalofop-butyl against broadleaf weeds and sedges. Through multiple sites of action, it delays the development of resistance in barnyard grass, Echinochloa crus-galli, and other weeds. ACCase inhibitors have a slow effect, while ALS inhibitors can accelerate weed death. Detailed Implementation
[0016] This invention provides a herbicidal composition based on oxazolidinyl and cyhalofop-butyl, comprising the following raw materials in parts by weight: 10-14 parts of active ingredient, 60-70 parts of dispersion medium, 10-15 parts of emulsifier, 3-5 parts of dispersant, 1.5-2.5 parts of thickener, 1-2 parts of stabilizer, 3 parts of antifreeze agent, and 0.5 parts of defoamer; The active ingredients include oxazolidinyl oxalic acid, cyhalofop-oxalic acid, and bispyribac-sodium; the dispersion medium includes methyl oleate and vegetable oil, wherein the vegetable oil includes one or more of soybean oil, rapeseed oil, peanut oil, and walnut oil.
[0017] In a further embodiment of this example, the mass ratio of oxazolidinyl oxalic acid, cyfluthrin and bispyribac-sodium in the active ingredients is 5:(5-8):(1-1.3).
[0018] In a further embodiment of this example, the dispersion medium includes pretreated oil and mixed oil, the volume ratio of the pretreated oil and mixed oil is 4:6, the pretreated oil is pure methyl oleate, and the mixed oil includes methyl oleate and vegetable oil.
[0019] In a further embodiment of this example, the mixed oil comprises methyl oleate and vegetable oil in a volume ratio of 7:3, wherein the vegetable oil is soybean oil.
[0020] In a further embodiment of this example, the emulsifier comprises castor oil polyoxyethylene ether and calcium alkylbenzene sulfonate in a volume ratio of 7:5, the thickener is modified organic bentonite, and the stabilizer is epoxidized soybean oil.
[0021] It should be noted that oxazolidinone, cyhalofop-butyl, and bispyribac-sodium constitute a ternary synergistic system. Bispyribac-sodium can effectively inhibit ALS enzymes and avoid phytotoxicity to rice. The synergistic effect of this invention stems from the synergy of biochemical interactions, physiological transduction, and timing of action. 1. Synergistic inhibition of target enzymes: Oxyfluzoxystrobin and cyhalofop-butyl jointly inhibit ACCase, but at different sites of action: Oxyfluzoxystrobin binds to the dimer interface of the ACCase CT functional domain, disrupting chloroplast grana stacking; cyhalofop-butyl inhibits the catalytic center of acetyl-CoA carboxylase; bispyribac-butyl inhibits ALS enzymes, blocking the synthesis of branched-chain amino acids (such as valine, leucine, and isoleucine), forming a "dual-channel blockade" with ACCase inhibitors; 2. Synergistic absorption and translocation: Cyhalofop-butyl enhances the penetration of the leaf cuticle, promoting the absorption of oxyfluzoxystrobin and bispyribac-butyl. Oxyfluzoxystrobin is translocated to meristems through the phloem, while bispyribac-butyl is translocated through both the xylem and phloem, achieving whole-plant distribution; 3. Complementary timing of action: Bispyribac-butyl acts rapidly, causing weed chlorosis in 3-5 days, compensating for the slow onset of action of ACCase inhibitors, which require 7-10 days.
[0022] The ternary synergistic system of this invention achieves its control efficacy against resistant weeds through multi-target attack and metabolic interference inhibition: it acts simultaneously on the two herbicide targets, ACCase and ALS, which are respectively HRAC classification groups A and B, preventing weeds with a single resistance mechanism from resisting them simultaneously; oxazolidinone inhibits cytochrome P450 monooxygenase, blocking the metabolic detoxification pathways of weeds to cyhalofop-butyl and bispyribac-sodium; bispyribac-sodium can downregulate ACCase gene expression, delaying the development of resistant barnyardgrass populations.
[0023] On the other hand, embodiments of the present invention also provide a method for preparing a herbicidal composition based on oxazolidinone and cyhalofop-butyl, comprising the following steps: S1. Mix oxazolidinyl oxalic acid, cyanoxazone and bispyribac-sodium in a mass ratio of 5:(5-8):(1-1.3), add pretreated oil and epoxidized soybean oil and perform high-speed shear pre-dispersion treatment to form primary slurry; S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill. The narrow particle size distribution can improve suspension stability. Then, transfer the slurry to a low-temperature mixing tank and add the mixed oil, emulsifier and dispersant in sequence while stirring. S3. Slowly add modified organic bentonite and stir evenly to adjust the viscosity, then add defoamer and antifreeze and stir evenly; S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
[0024] In a further embodiment of this example, the high-speed shear pre-dispersion treatment is to stir at 3000 rpm for 15 minutes; The horizontal grinding mill controls the material temperature below 40℃ during the grinding process to avoid the heat-sensitive failure of bispyribac-sodium (whose decomposition temperature is ≥65℃) and cyhalofop-butyl.
[0025] In a further embodiment of this example, the low-temperature stirred tank is subjected to a temperature of 15-20°C; The slurry is added to a low-temperature mixing vessel and stirred continuously at 600 rpm. First, 50% of the mixed oil is added slowly, and then the emulsifier is added simultaneously with the remaining mixed oil. After the mixed oil is added, the dispersant is added immediately.
[0026] In a further embodiment of this example, the modified organic bentonite is pre-hydrated before being added. During the addition of the pre-hydrated modified organic bentonite, defoamer, and antifreeze, the low-temperature stirring tank is maintained at a speed of 600 rpm.
[0027] On the other hand, embodiments of the present invention also provide an application of a herbicidal composition based on oxazolidinone and cyhalofop-butyl, the application of the above-mentioned herbicidal composition based on oxazolidinone and cyhalofop-butyl in the field of pesticides.
[0028] Example 1
[0029] S1. Oxazolyl oxalic acid, cyanoxalic acid and bispyribac-sodium are mixed evenly in a mass ratio of 5:5:1 to obtain 11 parts by mass of active ingredient. The total mass of dispersion medium is 65 parts, including pretreated oil and mixed oil in a volume ratio of 4:6. Pure methyl oleate accounting for 40% of the volume of dispersion medium and 1.5 parts by mass of epoxidized soybean oil are added. The mixture is subjected to high-speed shear pre-dispersion treatment at 3000 rpm for 15 min to form primary slurry. S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill at a temperature below 40℃ to improve suspension stability. Then, transfer the slurry to a low-temperature stirred tank and slowly add 50% of a mixture of methyl oleate and soybean oil in a volume ratio of 7:3 at 20℃ and 600rpm. Then, add 12 parts by weight of an emulsifier of castor oil polyoxyethylene ether and alkylbenzene sulfonate in a volume ratio of 7:5 simultaneously with the remaining 50% of the mixed oil. Immediately after the mixed oil is added, add 5 parts by weight of BASF Plurionic PE6400 EO-PO block copolymer dispersant. S3. Slowly add 2 parts by weight of modified organic bentonite as a thickener and stir evenly to adjust the viscosity. Then add 0.5 parts by weight of S3630E polyether modified silicone as an antifoaming agent and 3 parts by weight of glycerol as an antifreeze agent and stir evenly. S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
[0030] Example 2
[0031] S1. Oxazolyl oxalic acid, cyanoxalic acid and bispyribac-sodium are mixed evenly in a mass ratio of 5:6:1 to obtain 11 parts by mass of active ingredient. The total mass of dispersion medium is 65 parts, including pretreated oil and mixed oil in a volume ratio of 4:6. Pure methyl oleate accounting for 40% of the volume of dispersion medium and 1.5 parts by mass of epoxidized soybean oil are added. The mixture is subjected to high-speed shear pre-dispersion treatment at 3000 rpm for 15 min to form primary slurry. S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill at a temperature below 40℃ to improve suspension stability. Then, transfer the slurry to a low-temperature stirred tank and slowly add 50% of a mixture of methyl oleate and soybean oil in a volume ratio of 7:3 at 20℃ and 600rpm. Then, add 12 parts by weight of an emulsifier of castor oil polyoxyethylene ether and alkylbenzene sulfonate in a volume ratio of 7:5 simultaneously with the remaining 50% of the mixed oil. Immediately after the mixed oil is added, add 5 parts by weight of BASF Plurionic PE6400 EO-PO block copolymer dispersant. S3. Slowly add 2 parts by weight of modified organic bentonite as a thickener and stir evenly to adjust the viscosity. Then add 0.5 parts by weight of S3630E polyether modified silicone as an antifoaming agent and 3 parts by weight of glycerol as an antifreeze agent and stir evenly. S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
[0032] Example 3
[0033] S1. Oxazolyl oxalic acid, cyanoxalic acid and bispyribac-sodium are mixed evenly in a mass ratio of 5:7:1 to obtain 11 parts by mass of active ingredient. The total mass of dispersion medium is 65 parts, including pretreated oil and mixed oil in a volume ratio of 4:6. Pure methyl oleate accounting for 40% of the volume of dispersion medium and 1.5 parts by mass of epoxidized soybean oil are added. The mixture is subjected to high-speed shear pre-dispersion treatment at 3000 rpm for 15 min to form primary slurry. S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill at a temperature below 40℃ to improve suspension stability. Then, transfer the slurry to a low-temperature stirred tank and slowly add 50% of a mixture of methyl oleate and soybean oil in a volume ratio of 7:3 at 20℃ and 600rpm. Then, add 12 parts by weight of an emulsifier of castor oil polyoxyethylene ether and alkylbenzene sulfonate in a volume ratio of 7:5 simultaneously with the remaining 50% of the mixed oil. Immediately after the mixed oil is added, add 5 parts by weight of BASF Plurionic PE6400 EO-PO block copolymer dispersant. S3. Slowly add 2 parts by weight of modified organic bentonite as a thickener and stir evenly to adjust the viscosity. Then add 0.5 parts by weight of S3630E polyether modified silicone as an antifoaming agent and 3 parts by weight of glycerol as an antifreeze agent and stir evenly. S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
[0034] Example 4
[0035] S1. Oxazolyl oxalic acid, cyanoxalic acid and bispyribac-sodium are mixed evenly in a mass ratio of 5:8:1 to obtain 11 parts by mass of active ingredient. The total mass of dispersion medium is 65 parts, including pretreated oil and mixed oil in a volume ratio of 4:6. Pure methyl oleate accounting for 40% of the volume of dispersion medium and 1.5 parts by mass of epoxidized soybean oil are added. The mixture is subjected to high-speed shear pre-dispersion treatment at 3000 rpm for 15 min to form primary slurry. S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill at a temperature below 40℃ to improve suspension stability. Then, transfer the slurry to a low-temperature stirred tank and slowly add 50% of a mixture of methyl oleate and soybean oil in a volume ratio of 7:3 at 20℃ and 600rpm. Then, add 12 parts by weight of an emulsifier of castor oil polyoxyethylene ether and alkylbenzene sulfonate in a volume ratio of 7:5 simultaneously with the remaining 50% of the mixed oil. Immediately after the mixed oil is added, add 5 parts by weight of BASF Plurionic PE6400 EO-PO block copolymer dispersant. S3. Slowly add 2 parts by weight of modified organic bentonite as a thickener and stir evenly to adjust the viscosity. Then add 0.5 parts by weight of S3630E polyether modified silicone as an antifoaming agent and 3 parts by weight of glycerol as an antifreeze agent and stir evenly. S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
[0036] Comparative Example 1 S1. Oxazolyl oxalic acid and cyanoxalic acid are mixed evenly at a mass ratio of 5:5 to obtain 11 parts by mass of active ingredient. The total mass of dispersion medium is 65 parts, including pretreated oil and mixed oil at a volume ratio of 4:6. Pure methyl oleate accounting for 40% of the volume of dispersion medium and 1.5 parts by mass of epoxidized soybean oil are added. The mixture is subjected to high-speed shear pre-dispersion treatment at 3000 rpm for 15 min to form primary slurry. S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill at a temperature below 40℃ to improve suspension stability. Then, transfer the slurry to a low-temperature stirred tank and slowly add 50% of a mixture of methyl oleate and soybean oil in a volume ratio of 7:3 at 20℃ and 600rpm. Then, add 12 parts by weight of an emulsifier of castor oil polyoxyethylene ether and alkylbenzene sulfonate in a volume ratio of 7:5 simultaneously with the remaining 50% of the mixed oil. Immediately after the mixed oil is added, add 5 parts by weight of BASF Plurionic PE6400 EO-PO block copolymer dispersant. S3. Slowly add 2 parts by weight of modified organic bentonite as a thickener and stir evenly to adjust the viscosity. Then add 0.5 parts by weight of S3630E polyether modified silicone as an antifoaming agent and 3 parts by weight of glycerol as an antifreeze agent and stir evenly. S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
[0037] Comparative Example 2 S1. Oxazoyl oxalic acid, cyhalothrin and cyclopyralid are mixed evenly in a mass ratio of 5:5:10 to obtain 11 parts by mass of active ingredient. The total mass of dispersion medium is 65 parts, including pretreated oil and mixed oil in a volume ratio of 4:6. Pure methyl oleate accounting for 40% of the volume of dispersion medium and 1.5 parts by mass of epoxidized soybean oil are added. The mixture is subjected to high-speed shear pre-dispersion treatment at 3000 rpm for 15 min to form primary slurry. S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill at a temperature below 40℃ to improve suspension stability. Then, transfer the slurry to a low-temperature stirred tank and slowly add 50% of a mixture of methyl oleate and soybean oil in a volume ratio of 7:3 at 20℃ and 600rpm. Then, add 12 parts by weight of an emulsifier of castor oil polyoxyethylene ether and alkylbenzene sulfonate in a volume ratio of 7:5 simultaneously with the remaining 50% of the mixed oil. Immediately after the mixed oil is added, add 5 parts by weight of BASF Plurionic PE6400 EO-PO block copolymer dispersant. S3. Slowly add 2 parts by weight of modified organic bentonite as a thickener and stir evenly to adjust the viscosity. Then add 0.5 parts by weight of S3630E polyether modified silicone as an antifoaming agent and 3 parts by weight of glycerol as an antifreeze agent and stir evenly. S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
[0038] Comparative Example 3 S1. Oxazoyl oxalic acid, cyhalofop-butylic acid and pretilachlor are mixed evenly in a mass ratio of 1:1:1 to obtain 11 parts by mass of active ingredient. The total mass of dispersion medium is 65 parts, including pretreated oil and mixed oil in a volume ratio of 4:6. Pure methyl oleate accounting for 40% of the volume of dispersion medium and 1.5 parts by mass of epoxidized soybean oil are added. The mixture is subjected to high-speed shear pre-dispersion treatment at 3000 rpm for 15 min to form primary slurry. S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill at a temperature below 40℃ to improve suspension stability. Then, transfer the slurry to a low-temperature stirred tank and slowly add 50% of a mixture of methyl oleate and soybean oil in a volume ratio of 7:3 at 20℃ and 600rpm. Then, add 12 parts by weight of an emulsifier of castor oil polyoxyethylene ether and alkylbenzene sulfonate in a volume ratio of 7:5 simultaneously with the remaining 50% of the mixed oil. Immediately after the mixed oil is added, add 5 parts by weight of BASF Plurionic PE6400 EO-PO block copolymer dispersant. S3. Slowly add 2 parts by weight of modified organic bentonite as a thickener and stir evenly to adjust the viscosity. Then add 0.5 parts by weight of S3630E polyether modified silicone as an antifoaming agent and 3 parts by weight of glycerol as an antifreeze agent and stir evenly. S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
[0039] The suspensions prepared in Examples 1-4 and Comparative Examples 1-3 were used for experiments. The experiments were conducted on land with the same soil and area size in the same region for rice planting. The pesticide was applied when the rice seedlings were at the 3-leaf-1-heart to 4-leaf stage, the seedling height was ≥15cm, the weeds were at the 2-4-leaf stage, and the barnyard grass was at the ≤5-leaf stage. The field was drained before application and re-watered 1 day after application and kept moist for 7 days.
[0040] The herbicidal composition was mixed with water to obtain the pesticide, which was then applied. The volume ratio of the mixed herbicidal composition was 120ml / 30L. 30L of the pesticide was applied per acre by manual spraying. An aerial spraying adjuvant was added to the pesticide. The number of barnyard grass, Echinochloa crus-galli, and Cyperus spp. was collected before application and 7 days after application to obtain the herbicidal rate. The experimental data are shown in Table 1 below.
[0041] Table 1 Barnyardgrass control efficacy (%) Efficacy of Ephedra sinica (%) Cyperus rotundus control efficacy (%) Example 1 98.6 99.3 97.3 Example 2 97.3 98.6 96.7 Example 3 96.2 98.4 93.9 Example 4 95.7 98.1 91.6 Comparative Example 1 88.6 97.4 16.8 Comparative Example 2 92.1 96.3 55.9 Comparative Example 3 89.4 93.2 30.8 As shown in the table above, the herbicidal composition prepared by the present invention can achieve a strong control effect on multiple weeds compared with the commonly used oxazole-cyhalothrin single-use system, oxazole-cyhalothrin-cyhalothrin ternary system and oxazole-cyhalothrin-pretilachlor ternary system. Comparing Examples 1-4, it can be seen that the best control effect is achieved when oxazole-cyhalothrin, cyhalothrin and pretilachlor are mixed in a mass ratio of 5:5:1.
[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A herbicidal composition based on oxazolidinone and cyhalofop-butyl, characterized in that, The raw materials include the following parts by weight: 10-14 parts of active ingredient, 60-70 parts of dispersion medium, 10-15 parts of emulsifier, 3-5 parts of dispersant, 1.5-2.5 parts of thickener, 1-2 parts of stabilizer, 3 parts of antifreeze and 0.5 parts of defoamer; The active ingredients include oxazolidinyl oxalic acid, cyhalofop-oxalic acid, and bispyribac-sodium; the dispersion medium includes methyl oleate and vegetable oil, wherein the vegetable oil includes one or more of soybean oil, rapeseed oil, peanut oil, and walnut oil.
2. The herbicidal composition based on oxazolidinone and cyhalofop-butyl according to claim 1, characterized in that, The mass ratio of oxazolidinyl oxalic acid, cyfluthrin, and bispyribac-sodium in the active ingredients is 5:(5-8):(1-1.3).
3. The herbicidal composition based on oxazolidinone and cyhalofop-butyl according to claim 1, characterized in that, The dispersion medium includes pretreated oil and mixed oil, with a volume ratio of 4:
6. The pretreated oil is pure methyl oleate, and the mixed oil includes methyl oleate and vegetable oil.
4. The herbicidal composition based on oxazolidinone and cyhalofop-butyl according to claim 3, characterized in that, The mixed oil comprises methyl oleate and vegetable oil in a volume ratio of 7:3, wherein the vegetable oil is soybean oil.
5. The herbicidal composition based on oxazolidinone and cyhalofop-butyl according to claim 1, characterized in that, The emulsifier comprises castor oil polyoxyethylene ether and calcium alkylbenzene sulfonate in a volume ratio of 7:5, the thickener is modified organic bentonite, and the stabilizer is epoxidized soybean oil.
6. A method for preparing a herbicidal composition based on oxazolidinone and cyhalofop-butyl according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Mix oxazolyl oxalic acid, cyanoxalic acid and bispyribac-sodium in a mass ratio of 5:(5-8):(1-1.3), add pretreated oil and epoxidized soybean oil and perform high-speed shear pre-dispersion treatment to form primary slurry; S2. Grind the primary slurry to a particle size ≤3μm using a horizontal mill, then transfer the slurry to a low-temperature mixing tank and add the mixed oil, emulsifier and dispersant in sequence while stirring. S3. Slowly add modified organic bentonite and stir evenly to adjust the viscosity, then add defoamer and antifreeze and stir evenly; S4. After maturing in a sealed environment at a constant temperature of 25℃ for 24 hours, fill and store away from light.
7. The method for preparing the herbicidal composition based on oxazolidinone and cyhalofop-butyl according to claim 6, characterized in that, The high-speed shear pre-dispersion treatment involves stirring at 3000 rpm for 15 minutes. The horizontal grinding mill controls the material temperature to be below 40°C during the grinding process.
8. The method for preparing the herbicidal composition based on oxazolidinone and cyhalofop-butyl according to claim 6, characterized in that, The low-temperature stirred tank is kept at a temperature of 15-20℃. The slurry is added to a low-temperature mixing vessel and stirred continuously at a speed of 600 rpm. First, 50% of the mixed oil is added slowly, and then the emulsifier is added simultaneously with the remaining mixed oil. After the mixed oil is added, the dispersant is added immediately.
9. The method for preparing the herbicidal composition based on oxazolidinone and cyhalofop-butyl according to claim 6, characterized in that, The modified organic bentonite is pre-hydrated before being added. During the addition of the pre-hydrated modified organic bentonite, defoamer, and antifreeze, the low-temperature stirring tank is maintained at a speed of 600 rpm.
10. The application of a herbicidal composition based on oxazolidinone and cyhalofop-butyl, characterized in that, Application of the herbicidal composition based on oxazolidinone and cyhalofop-butyl according to any one of claims 1-5 in the field of pesticides.