A herbicidal microemulsion for peanut field and a method for preparing the same

Abstract

The application belongs to the field of herbicides, and particularly relates to a herbicidal microemulsion for peanut fields and a preparation method thereof, which is prepared from the following components in percentage by weight: 4-6% of imazapyr, 4-6% of quizalofop-p-ethyl, 1-3% of flurichloride, 15-20% of an emulsifier, 5-8% of a dispersant, 4-6% of an organic solvent, and the balance of water; the emulsifier comprises sodium dodecyl benzene sulfonate and triphenyl ethenyl phenol polyoxyethylene ether; the mass ratio of the sodium dodecyl benzene sulfonate to the triphenyl ethenyl phenol polyoxyethylene ether is 1:(0.9-0.95); the dispersant comprises a polycarboxylate dispersant and a comb-shaped graft polymerization surfactant; the mass ratio of the polycarboxylate dispersant to the comb-shaped graft polymerization surfactant is 1:(1.3-1.8). The herbicidal microemulsion has good solubility, dispersibility and stability, and low surface tension.

Description

Technical Field

[0001] This invention belongs to the field of herbicides, specifically relating to a herbicidal microemulsion for peanut fields and its preparation method. Background Technology

[0002] Peanuts are an important source of edible oil and protein feed in my country, characterized by their strong adaptability, wide range of uses, and high economic value, and are cultivated in most parts of the country. Peanuts have a long growing season, and there are many types of weeds, which significantly impact peanut yield. The main weeds in peanut fields are grasses such as goosegrass, crabgrass, and foxtail, as well as broadleaf weeds such as purslane, amaranth, and ironweed.

[0003] Herbicides are pesticides that kill or inhibit the growth of weeds. Herbicides such as haloxyfop-methyl, quizalofop-P-ethyl, flumetsulam, nicotinic acid, lactofen, quizalofop-P-ethyl, and ethoxysulfuron are foliar-applied herbicides used in peanut fields, offering advantages such as low environmental pollution, low dosage, and low soil moisture requirements. However, when used alone, haloxyfop-methyl, quizalofop-P-ethyl, flumetsulam, nicotinic acid, lactofen, quizalofop-P-ethyl, and ethoxysulfuron can only control either grassy or broadleaf weeds, and cannot simultaneously control both.

[0004] To effectively control both grassy and broadleaf weeds in peanut fields, emulsifiable concentrates formulated with combinations of quizalofop-P-ethyl and ethoxysulfuron, quizalofop-P-ethyl and flufenoxuron, and quizalofop-P-ethyl and haloxyfop-methyl have been developed to significantly enhance the weed control effect in peanut fields. However, because the water solubility of both quizalofop-P-ethyl and ethoxysulfuron is less than 1 mg / L, the stability of the quizalofop-P-ethyl and ethoxysulfuron emulsifiable concentrate in water is poor. After mixing with water, it quickly exhibits stratification and precipitation, affecting its efficacy. Summary of the Invention

[0005] To improve the stability of the compound emulsifiable concentrate of quizalofop-P-ethyl and ethoxysulfuron in water, this application provides a herbicidal microemulsion for peanut fields and its preparation method.

[0006] In the first aspect, this application provides a herbicidal microemulsion for peanut fields, which is achieved by the following technical solution: a herbicidal microemulsion for peanut fields, which, by weight percentage, is composed of the following components: 4-6% imidacloprid, 4-6% quizalofop-p-ethyl, 1-3% ethoxysulfuron, 15-20% emulsifier, 5-8% dispersant, 4-6% organic solvent and water balance;

[0007] The emulsifier comprises sodium dodecylbenzenesulfonate and tristyrylphenol polyoxyethylene ether; the mass ratio of sodium dodecylbenzenesulfonate to tristyrylphenol polyoxyethylene ether is 1:(0.9-0.95);

[0008] The dispersant comprises a polycarboxylate dispersant and a comb-type grafted polymeric surfactant; the mass ratio of the polycarboxylate dispersant to the comb-type grafted polymeric surfactant is 1:(1.3-1.8).

[0009] By adopting the above technical solution, the herbicidal microemulsion is safe for peanuts. No phytotoxicity symptoms were observed in peanuts at any of the dosage treatment areas after application. The herbicidal microemulsion effectively controlled weeds in peanut fields without any side effects on other non-target organisms. The herbicidal microemulsion showed good weed control in peanut fields, and also demonstrated good control efficacy against broadleaf weeds such as purslane and amaranth, and grassy weeds such as crabgrass and goosegrass. Compared with quizalofop-P-ethyl and ethoxysulfuron, the herbicidal microemulsion of this application broadened the weed control spectrum, and compared with nicotinic acid, the herbicidal microemulsion showed higher efficacy.

[0010] The emulsifiers in this application include sodium dodecylbenzenesulfonate and tristyrylphenol polyoxyethylene ether, which improve the solubility and dispersibility of quizalofop-P-ethyl and ethoxysulfuron in water, reduce the surface tension of the herbicidal microemulsion, and improve the stability and thermal storage stability of the herbicidal microemulsion.

[0011] The dispersants in this application include polycarboxylate dispersants and comb-type grafted polymerized surfactants, which improve the solubility and dispersibility of quizalofop-P-ethyl and ethoxysulfuron in water, reduce the surface tension of the herbicidal microemulsion, and improve the stability and cold storage stability of the herbicidal microemulsion.

[0012] Preferably, the raw materials for its preparation, by weight percentage, consist of the following components: 5% nicotinic acid, 5% quizalofop-p-ethyl, 2% ethoxysulfuron, 19.3% emulsifier, 7% dispersant, 5.6% organic solvent, and the balance being water.

[0013] Preferably, the polycarboxylate dispersant is polycarboxylate dispersant Dispersant-9150N.

[0014] Preferably, the comb-type graft polymerizing surfactant is Atlox4913 comb-type graft copolymer.

[0015] Preferably, the dispersant further includes sodium alginate; the mass ratio of the polycarboxylate dispersant, the comb-type grafted polymeric surfactant and the sodium alginate is 1:(1.3-1.8):(0.12-0.16).

[0016] By adopting the above technical solution, the polycarboxylate dispersant, comb-type grafted polymerizing surfactant, and sodium alginate work together to further reduce the surface tension of the herbicidal microemulsion and improve its stability.

[0017] Preferably, the mass ratio of the polycarboxylate dispersant, the comb-type grafted polymeric surfactant, and the sodium alginate is 1:1.6:0.13.

[0018] By adopting the above technical solution, the surface tension of the herbicidal microemulsion is lower.

[0019] Preferably, the emulsifier further includes castor oil polyoxyethylene ether; the mass ratio of sodium dodecylbenzenesulfonate, tristyrylphenol polyoxyethylene ether and castor oil polyoxyethylene ether is 1:(0.9-0.95):(0.1-0.18).

[0020] By adopting the above technical solution, sodium dodecylbenzenesulfonate, tristyrylphenol polyoxyethylene ether, and castor oil polyoxyethylene ether work together to further reduce the surface tension of the herbicidal microemulsion and improve its stability.

[0021] Preferably, the mass ratio of sodium dodecylbenzenesulfonate, tristyrylphenol polyoxyethylene ether, and castor oil polyoxyethylene ether is 1:0.93:0.15.

[0022] By adopting the above technical solution, the surface tension of the herbicidal microemulsion is lower.

[0023] Preferably, the organic solvent comprises cyclohexanone and xylene; the mass ratio of cyclohexanone to xylene is (2-3):(2.5-3.5).

[0024] Secondly, this application provides a method for preparing a herbicidal microemulsion for peanut fields, which is achieved using the following technical solution:

[0025] A method for preparing a herbicidal microemulsion for peanut fields includes the following steps:

[0026] Mix emulsifier, dispersant and organic solvent, add methyl methacrylate, quizalofop-p-ethyl and ethoxysulfuron, stir, then add water and stir evenly to obtain a herbicidal microemulsion for peanut fields.

[0027] In summary, this application has the following beneficial effects:

[0028] 1. The herbicidal microemulsion provided in this application is safe for peanuts. No phytotoxicity symptoms were observed in peanuts at any of the dosage treatment areas after application. The herbicidal microemulsion effectively controlled weeds in peanut fields and did not cause any side effects on other non-target organisms. The herbicidal microemulsion has good weed control effects on peanut fields and is effective against broadleaf weeds such as purslane and ironweed, and grassy weeds such as crabgrass and goosegrass. Compared with quizalofop-P-ethyl and ethoxysulfuron, the herbicidal microemulsion of this application has a broader spectrum of weed control, and compared with nicotinic acid, the herbicidal microemulsion has higher efficacy.

[0029] 2. The emulsifiers in this application include sodium dodecylbenzenesulfonate and tristyrylphenol polyoxyethylene ether, which improve the solubility and dispersibility of quizalofop-P-ethyl and ethoxysulfuron in water, reduce the surface tension of the herbicidal microemulsion, and improve the stability and thermal storage stability of the herbicidal microemulsion.

[0030] 3. The dispersants in this application include polycarboxylate dispersants and comb-type grafted polymerized surfactants, which improve the solubility and dispersibility of quizalofop-P-ethyl and ethoxysulfuron in water, reduce the surface tension of the herbicidal microemulsion, and improve the stability and cold storage stability of the herbicidal microemulsion.

[0031] 4. The dispersant also includes sodium alginate. The addition of sodium alginate further improves the stability of the microemulsion and reduces the surface tension of the herbicidal microemulsion.

[0032] 5. The emulsifier also includes castor oil polyoxyethylene ether. The addition of castor oil polyoxyethylene ether further improves the stability of the microemulsion and reduces the surface tension of the herbicidal microemulsion. Detailed Implementation

[0033] The present application will be further described in detail below with reference to the embodiments.

[0034] Example

[0035] Examples 1-11 provide a herbicidal microemulsion for peanut fields.

[0036] The herbicidal microemulsion for peanut fields provided in Example 1 is prepared by the following steps:

[0037] 7.9g sodium dodecylbenzenesulfonate, 7.1g tristyrene-phenylphenol polyoxyethylene ether, 3.5g polycarboxylate dispersant Dispersant-9150N, 4.5g Atlox4913 comb-type graft copolymer, 1.8g cyclohexanone and 2.2g xylene were mixed and stirred at 300 rpm for 15 min. Then, 4g imidacloprid nicotinic acid, 6g quizalofop-P-ethyl and 1g ethoxysulfuron were added and stirred at 400 rpm for 30 min. Finally, 62g water was added and stirred at 500 rpm for 30 min. After sampling and testing, the mixture was filtered. The filtered product was tested again and then filled and stored to obtain a herbicidal microemulsion for peanut fields.

[0038] Among them, tristyrene-based phenol polyoxyethylene ether, model Nongru 1602#, was purchased from Haian Petrochemical Plant in Jiangsu Province.

[0039] The polycarboxylate dispersant Dispersant-9150N was purchased from Weifang Luyi Chemical Co., Ltd.

[0040] Atlox 4913 comb-type graft copolymer was purchased from Croda.

[0041] The herbicidal microemulsions for peanut fields provided in Examples 2-11 differ only in the mass of each component, as detailed in Table 1.

[0042] Table 1 Mass of each component in Examples 1-11

[0043]

[0044]

[0045] Among them, castor oil polyoxyethylene ether, model EL20, was purchased from Haian Petrochemical Plant in Jiangsu Province;

[0046] Sodium alginate, viscosity 200±20 mPa·s, purchased from Shanghai Ziyi Reagent Factory.

[0047] Comparative Example

[0048] The herbicidal microemulsion for peanut fields provided in Comparative Example 1 differs from that in Example 1 only in that the polycarboxylate dispersant Dispersant-9150N is replaced by an equal amount of Atlox4913 comb-type graft copolymer.

[0049] The herbicidal microemulsion for peanut fields provided in Comparative Example 2 differs from that in Example 1 only in that the Atlox4913 comb-type graft copolymer is replaced by an equal mass of polycarboxylate dispersant Dispersant-9150N.

[0050] The herbicidal microemulsion for peanut fields provided in Comparative Example 3 differs from that in Example 1 only in that sodium dodecylbenzenesulfonate is replaced by tristyrylphenol polyoxyethylene ether at the same mass.

[0051] The herbicidal microemulsion for peanut fields provided in Comparative Example 4 differs from that in Example 1 only in that the mass of tristyrene-phenylphenol polyoxyethylene ether is replaced with sodium dodecylbenzenesulfonate.

[0052] The herbicidal microemulsion for peanut fields provided in Comparative Example 5 differs from that in Example 1 only in that the polycarboxylate dispersant Dispersant-9150N is replaced by sodium dodecylbenzenesulfonate and the Atlox4913 comb-type graft copolymer is replaced by tristyrylphenol polyoxyethylene ether.

[0053] The herbicidal microemulsion for peanut fields provided in Comparative Example 6 differs from that in Example 1 only in that: the polycarboxylate dispersant Dispersant-9150N is replaced by sodium dodecylbenzenesulfonate, the Atlox4913 comb-type graft copolymer is replaced by sodium dodecylbenzenesulfonate, and the tristyrene-phenylphenol polyoxyethylene ether is replaced by sodium dodecylbenzenesulfonate.

[0054] Performance testing

[0055] The following performance tests were conducted on the herbicidal microemulsions for peanut fields prepared in Examples 1-11 and Comparative Examples 1-6 of this application.

[0056] 1. Microemulsion stability: Following the method specified by the Food and Agriculture Organization of the United Nations (FAO), at 30°C, 95 mL of 342 mg / L standard hard water (0.304 g anhydrous calcium chloride and 0.139 g magnesium chloride with 6 parts water of crystallization diluted to 1 L with distilled water) was added to a 100 mL graduated cylinder. 5 mL of the herbicidal microemulsion samples from Examples 1-11 and Comparative Examples 1-6 used in peanut fields were taken with a pipette and slowly added to the graduated cylinder. The initial emulsion was observed. The graduated cylinder was then inverted several times and allowed to stand for the specified time (0.5 h). The presence or absence of emulsion precipitation (including emulsifiable oil and sediment) was observed. If any was formed, its volume was recorded. The test results are shown in Table 2.

[0057] 2. Thermal storage stability: The herbicidal microemulsions used in peanut fields in Examples 1-11 and Comparative Examples 1-6 were stored at 54℃ for 14 days and then centrifuged. If no crystallization or stratification occurred, the product was considered qualified; otherwise, it was considered unqualified. The test results are shown in Table 2.

[0058] 3. Cold storage stability: The herbicidal microemulsions used in peanut fields in Examples 1-11 and Comparative Examples 1-6 were stored at 0℃ for 7 days and then centrifuged for observation. If there was no crystallization or stratification, it was considered qualified; otherwise, it was considered unqualified. The test results are shown in Table 2.

[0059] 4. Surface tension: The herbicidal microemulsions used in Examples 1-11 and Comparative Examples 1-6 for peanut fields were prepared into 0.2% mass fraction dilutions. The surface tension of the dilutions was measured at 20°C using a fully automatic surface tension meter (ring method). The test results are shown in Table 2.

[0060] Table 2 Test Results

[0061]

[0062]

[0063] The following section details this application based on the test data in Table 2.

[0064] The test data from Example 1 and Comparative Examples 1-2 show that the polycarboxylate dispersant Dispersant-9150N and Atlox4913 comb-type graft copolymer work together to improve the solubility and dispersibility of quizalofop-P-ethyl and ethoxysulfuron in water, reduce the surface tension of the herbicidal microemulsion, and improve the stability and cold storage stability of the herbicidal microemulsion.

[0065] The test data from Example 1 and Comparative Examples 3-4 show that the combined effect of sodium dodecylbenzenesulfonate and tristyrylphenol polyoxyethylene ether improves the solubility and dispersibility of quizalofop-P-ethyl and ethoxysulfuron in water, reduces the surface tension of the herbicidal microemulsion, and improves the stability and thermal storage stability of the herbicidal microemulsion.

[0066] As can be seen from the test data of Example 1 and Comparative Example 5, the addition of Atlox4913 comb-type graft copolymer and polycarboxylate dispersant Dispersant-9150N to this application improves the solubility and dispersibility of quizalofop-P-ethyl and ethoxysulfuron in water, reduces the surface tension of the herbicidal microemulsion, and improves the stability, thermal storage stability and cold storage stability of the herbicidal microemulsion.

[0067] The test data from Example 1 and Comparative Example 6 show that the dispersant Atlox4913 comb-type graft copolymer, the polycarboxylate dispersant Dispersant-9150N, and the emulsifier tristyrene-phenol polyoxyethylene ether work together to improve the solubility and dispersibility of quizalofop-p-ethyl and ethoxysulfuron in water, reduce the surface tension of the herbicidal microemulsion, and improve the stability, thermal storage stability, and cold storage stability of the herbicidal microemulsion.

[0068] As can be seen from the test data of Examples 5 and Examples 6-8, the dispersant in Examples 6-8 also includes sodium alginate. The addition of sodium alginate further improves the stability of the microemulsion and reduces the surface tension of the herbicidal microemulsion.

[0069] As can be seen from the test data of Examples 8 and Examples 9-11, the emulsifier in Examples 9-11 also includes castor oil polyoxyethylene ether. The addition of castor oil polyoxyethylene ether further improves the stability of the microemulsion and reduces the surface tension of the herbicidal microemulsion.

[0070] Field trials were conducted using the herbicidal microemulsion for peanut fields provided in Example 3.

[0071] 1. Field experiment

[0072] 5.1 Test Crops

[0073] Peanut variety: 606.

[0074] 5.2 Species of the main target grasses in the experiment

[0075] Purslane (Portulaca olera), iron amaranth (Acalypha australis), crabgrass (Digitaria sanguinalis), and goosegrass (Eleusine indica).

[0076] 5.3 Cultivation conditions

[0077] The soil type of the experimental site was brown soil, with an organic matter content of 1.41%, pH 6.57, available nitrogen of 123.67 mg / kg, available phosphorus of 47.81 mg / kg, and available potassium of 99.36 mg / kg. The peanut planting density was 9000 holes / mu.

[0078] 5.4 Weather conditions on the day of pesticide application

[0079] Sunny, average temperature 25.21℃, high temperature 30.80℃, low temperature 20.60℃, relative humidity 60.99%, southerly wind 0.21m / s.

[0080] 5.5 Data on pest and disease control and non-target herbal agents

[0081] No other herbicides, insecticides, or fungicides were used.

[0082] 5.6 Pharmacology

[0083] See Table 3 for details.

[0084] Table 3. Pharmaceutical Design

[0085]

[0086]

[0087] 5.7 Application Method

[0088] Application method: Apply as a spray to the stems and leaves;

[0089] Application equipment: MATABT Round 7 (pressure 1.0 kgf / cm², nozzle XR TEEJER 11004VS);

[0090] Application time and frequency: Peanuts should be in the seedling stage, annual grass weeds should be in the 3-5 leaf stage, and broadleaf weeds should be in the 2-4 leaf stage when applying the pesticide; Application volume: 450 liters / hectare, 900 mL of water should be used in the test plot, and the test plot area should be 20 square meters.

[0091] Preparation method: Select the reagent for the treatment area using the two-stage dilution method. Add 50mL of water to 100mL of the sample box, dilute and mix well, and then pour into the sprayer. Make up the amount of water according to the water consumption of the area.

[0092] 5.8 Test Methods

[0093] 5.8.1 Survey time and number of times

[0094] Visually inspect crop growth at 7, 15, and 30 days after application of the pesticide, and before harvest.

[0095] 5.8.2 Survey Methodology

[0096] Observe whether the pesticide causes phytotoxicity to the crop. If phytotoxicity occurs, record the type and severity of the phytotoxicity according to the following requirements:

[0097] 1. If the damage from pesticides can be counted or measured, use the absolute value method.

[0098] Method for investigating plant height (fresh weight) inhibition rate: 20 representative plants were taken from each plot, and the plant height (fresh weight) inhibition rate of the herbicide-treated area relative to the manual weeding area was calculated.

[0099] The formula for calculating the plant height (fresh weight) inhibition rate is:

[0100]

[0101] 2. In other cases, a visual survey method is used to compare the pesticide-treated area with the manual weeding-treated area, accurately describe the symptoms of pesticide damage (growth inhibition, chlorosis, deformity, etc.), and evaluate the percentage of pesticide damage.

[0102] 5.8.3 Crop Yield Survey Methods

[0103] Zoned delivery, removing edge rows, and taking the middle 10m section of the community. 2 Yield assessment. Each plot is graded and scored according to the pesticide damage classification method.

[0104] Level 1: The crop is growing normally and shows no signs of damage;

[0105] Level 2: Slight pesticide damage to crops, with damage less than 10%;

[0106] Level 3: Moderate pesticide damage to crops, which can recover later and will not affect yield;

[0107] Level 4: Severe pesticide damage to crops, difficult to recover from, resulting in reduced yield;

[0108] Level 5: Severe pesticide damage to crops, irreversible, resulting in significant yield reduction or complete crop failure.

[0109] 5.8.4 Time and frequency of investigation into the effectiveness of pest control

[0110] Weed surveys were conducted twice, 15 days and 30 days after the application of the pesticide.

[0111] 5.8.5 Methods for investigating the effectiveness of pest control

[0112] The absolute value survey method was used. The first survey investigated the control efficacy based on the number of plants, and the second survey added an investigation based on the control efficacy based on fresh weight.

[0113] The survey method involved sampling at four points in each treatment area, with each point measuring 0.25m. 2 (0.5m × 0.5m), measure the number of weeds (fresh weight), and calculate the control efficacy according to the following formula:

[0114]

[0115]

[0116] 5.8.6 Methods for investigating the impact on other non-target organisms: Visual inspection method, to investigate and observe the impact on other major non-target organisms on the test platform.

[0117] 5.8.7 Data Processing and Analysis Methods

[0118] The experimental results were processed using the DPS7.05 data processing system, and the difference analysis was performed using the Duncan's New Multiple Range (DMRT) method.

[0119] 5.8.8 Test Results

[0120] 5.8.8.1 Safety assessment of crops

[0121] The herbicidal microemulsion prepared in Example 3 was safe for peanuts, and no phytotoxicity symptoms were observed in peanuts in each dosage treatment area after application.

[0122] When peanuts matured, samples were taken from each plot for harvest and yield measurement. There was no significant difference in yield between the pesticide-treated plots and the manually weeded plots. The degree of pesticide damage was classified as Level 1 according to the 5-level pesticide damage grading method. The specific effects of controlling annual weeds in peanut fields on peanut yield are shown in Table 4.

[0123] Table 4. Effects of annual weed control on peanut yield in peanut fields.

[0124]

[0125]

[0126] 5.8.8.2 Weed control effect

[0127] Seven days after the application, weeds showed signs of leaf wilting and drying, indicating herbicide damage, and some young weeds died. Table 5 shows the control efficacy and number of plants affected by the herbicide 15 days after application for purslane, amaranth, crabgrass, and goosegrass.

[0128] Table 5. Number of plants and control efficacy of purslane, amaranth, crabgrass, and goosegrass 15 days after application.

[0129]

[0130] The specific control efficacy of the number of plants of purslane, amaranth, crabgrass, and goosegrass 30 days after application is shown in Table 6.

[0131] Table 6. Number of plants and control efficacy of purslane, amaranth, crabgrass, and goosegrass 30 days after application of the pesticide.

[0132]

[0133]

[0134] The specific efficacy of fresh weight control on purslane, amaranth, crabgrass, and goosegrass 30 days after application is shown in Table 7.

[0135] Table 7. Fresh weight and preventive efficacy of purslane, amaranth, crabgrass, and goosegrass 30 days after application.

[0136]

[0137] No effects on other non-target organisms were found.

[0138] As shown in Tables 4-7 above, the herbicidal microemulsion prepared in Example 3 of this application has good safety for peanuts, and no obvious phytotoxicity symptoms were observed after application. Yield measurements showed no significant difference in peanut yield between the different herbicide treatment areas and the manual weeding treatment area, with the phytotoxicity level classified as Level 1 according to the 5-level phytotoxicity grading method. The herbicidal microemulsion prepared in Example 3 of this application has good weed control effects on peanut fields, showing good control efficacy against broadleaf weeds such as purslane and ironweed, and grassy weeds such as crabgrass and goosegrass. Compared with the control herbicides quizalofop-P-ethyl and ethoxysulfuron, the herbicidal microemulsion prepared in Example 3 of this application has a broader weed control spectrum, and the control efficacy at effective doses of 90.00-126.00 g / ha is higher than that of the control herbicide nicotinic acid. No side effects were found on other non-target organisms when the herbicidal microemulsion prepared in Example 3 of this application was used to control weeds in peanut fields.

[0139] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A herbicidal microemulsion for peanut fields, characterized in that, The raw materials for its preparation, by weight percentage, consist of the following components: 4-6% nicotinic acid, 4-6% quizalofop-p-ethyl, 1-3% ethoxysulfuron, 15-20% emulsifier, 5-8% dispersant, 4-6% organic solvent, and water as the balance. The emulsifier comprises sodium dodecylbenzenesulfonate and tristyrylphenol polyoxyethylene ether; the mass ratio of sodium dodecylbenzenesulfonate to tristyrylphenol polyoxyethylene ether is 1:(0.9-0.95). The dispersant comprises a polycarboxylate dispersant and a comb-type grafted polymeric surfactant; the mass ratio of the polycarboxylate dispersant to the comb-type grafted polymeric surfactant is 1:(1.3-1.8).

2. The herbicidal microemulsion for peanut fields according to claim 1, characterized in that, The raw materials for its preparation consist of the following components by weight percentage: 5% nicotinic acid, 5% quizalofop-p-ethyl, 2% ethoxysulfuron, 19.3% emulsifier, 7% dispersant, 5.6% organic solvent and water balance.

3. The herbicidal microemulsion for peanut fields according to claim 1, characterized in that, The polycarboxylate dispersant is polycarboxylate dispersant-9150N.

4. The herbicidal microemulsion for peanut fields according to claim 1, characterized in that, The comb-type graft polymerizing surfactant is Atlox4913 comb-type graft copolymer.

5. A herbicidal microemulsion for peanut fields according to claim 1, characterized in that, The dispersant also includes sodium alginate; the mass ratio of the polycarboxylate dispersant, comb-type grafted polymeric surfactant and sodium alginate is 1:(1.3-1.8):(0.12-0.16).

6. A herbicidal microemulsion for peanut fields according to claim 5, characterized in that, The mass ratio of the polycarboxylate dispersant, comb-type grafted polymeric surfactant, and sodium alginate is 1:1.6:0.

13.

7. A herbicidal microemulsion for peanut fields according to claim 1, characterized in that, The emulsifier also includes castor oil polyoxyethylene ether; the mass ratio of sodium dodecylbenzenesulfonate, tristyrylphenol polyoxyethylene ether and castor oil polyoxyethylene ether is 1:(0.9-0.95):(0.1-0.18).

8. A herbicidal microemulsion for peanut fields according to claim 7, characterized in that, The mass ratio of sodium dodecylbenzenesulfonate, tristyrylphenol polyoxyethylene ether, and castor oil polyoxyethylene ether is 1:0.93:0.

15.

9. A herbicidal microemulsion for peanut fields according to any one of claims 1-8, characterized in that, The organic solvent includes cyclohexanone and xylene; the mass ratio of cyclohexanone to xylene is (2-3):(2.5-3.5).

10. A method for preparing a herbicidal microemulsion for peanut fields according to any one of claims 1-9, characterized in that, Includes the following steps: Mix emulsifier, dispersant and organic solvent, add methyl methacrylate, quizalofop-p-ethyl and ethoxysulfuron, stir, then add water and stir evenly to obtain a herbicidal microemulsion for peanut fields.

Images