Agricultural pesticide emulsion in water and its preparation method

Abstract

The present application provides a kind of pesticide emulsion in water, and the preparation method of the emulsion in water.The composition includes the emulsion in water by mass percentage includes the following components: fluorine mite sulfide 1%~40%, other active ingredients 0%~40%, solvent 1%~30%, surfactant 0.5%~10%, co-surfactant 0.2%~15%, antifreeze 0~10%, preservative 0~0.5%, deionized water is supplemented to 100%.The emulsion in water can efficiently prevent and control various phytophagous harmful mites, the effect is remarkable, compared with existing preparation, can reduce the number of application, improve the prevention and treatment effect, reduce labor cost.

Description

Technical Field

[0001] This invention relates to a pesticide emulsion and its preparation method, belonging to the technical field of pesticide emulsions. Background Technology

[0002] A water-in-oil emulsion (HIE) is a pesticide formulation formed by dispersing a water-insoluble active ingredient (e.g., a technical grade pesticide) in water or a liquid obtained by dissolving a technical grade pesticide in a water-insoluble organic solvent. HIEs are a new type of environmentally friendly formulation. Compared to emulsifiable concentrates (ECs), they use water to completely or partially replace organic solvents as the medium, making them relatively safe for humans and animals and causing less environmental pollution.

[0003] Water-based emulsions, as water-based formulations that replace emulsifiable concentrates, offer advantages such as safety, environmental friendliness, and low cost. However, the oil and water in water-based emulsions are immiscible two phases, making them typical thermodynamically unstable systems. The formation and stability of water-based emulsions are influenced by factors such as preparation methods, preparation conditions, and surfactants. Among these, surfactants are a key factor in preparing stable emulsions. Currently, the types of surfactants used in the preparation of pesticide water-based emulsions are limited, and many are outdated, difficult to degrade, and pose potential biotoxicity and environmental pollution.

[0004] In recent years, with increasing attention to energy and environmental issues and the need to control carbon emissions, the search for emulsifiers and pesticide water-in-oil emulsion systems with better raw material sources, good biocompatibility, wide applicability, and wide temperature tolerance has become an urgent problem to be solved. In response to the above problems, this invention provides a flumethrin-containing pesticide water-in-oil emulsion and its preparation method. This formulation can significantly improve the stability of active ingredients, has strong wetting and penetration capabilities, and is environmentally safe. Summary of the Invention

[0005] The purpose of this invention is to provide a pesticide emulsion containing flumethrin and its preparation method, so as to effectively solve the above-mentioned problems.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: a pesticide emulsion, wherein the emulsion comprises the following components by mass percentage: 1%–40% flufenoxuron, 1%–40% other active ingredients, 1%–30% solvent, 0.5%–10% surfactant, 0.2%–15% co-surfactant, 0–10% antifreeze, 0–0.5% preservative, and deionized water to bring the total to 100%.

[0007] Other active ingredients include one or more of insecticides, acaricides, fungicides, or herbicides.

[0008] Further, the water-based emulsion comprises the following components by mass percentage: 5%–30% flufenoxuron, 1%–20% of another active ingredient, 10%–30% of solvent, 2%–8% of surfactant, 1%–10% of co-surfactant, 4%–8% of antifreeze, 0.05%–0.2% of preservative, and deionized water to bring the total to 100%.

[0009] Other active ingredients are one or more of insecticides and acaricides;

[0010] Furthermore, the insecticides and acaricides mentioned are selected from: heterocyclic compounds, quaternary keto acids, benzoyl acetonitrs, oxazoles, pyrazole amides, bifenazates, antibiotics, organotin compounds, tetrazines, thiazolidinones, sulfites, thioureas, sulfoxides, bridged cyclic amines, quinolines, quinazolines, pyridazinones, benzoylurea, methoxyacrylates, benzoate esters, pyrazoles, pyrroles, pyrimidines, naphthoquinones, pyridazines, pyrethroids, bio-based compounds, non-systemic organonitrogen compounds, and other categories;

[0011] Furthermore, the aforementioned heterocyclic compounds include: pyridaben and azoxystrobin;

[0012] The aforementioned quaternary keto acids include: spirotetramat, spirodiclofen, spirodiclofen diester, quaternary ketoclofen, and quaternary ketoclofen.

[0013] The benzoyl acetonitrile mentioned above: Butoxyfen;

[0014] The oxazoles mentioned are: etoxazole, fluxametamide, and isocycloseram;

[0015] The pyrazole amides mentioned include: pyridaben, pyflubumide, etoxazole, and cyprodinil.

[0016] The aforementioned biphenylhydrazine derivative: biphenylhydrazine ester;

[0017] The antibiotics mentioned are: avermectin, methylavermectin benzoate, liuyangmycin, huaguangmycin, and mibamectin;

[0018] The organotin compounds mentioned above: triazole tin, phenylbutane tin;

[0019] The aforementioned tetrazines include tetradifon and flufenoxam;

[0020] The thiazolidinones mentioned above: thiamethoxam;

[0021] The aforementioned sulfites: propargite;

[0022] The thiourea derivatives mentioned above include: bufenozide and acaricide;

[0023] The sulfoxide class mentioned: Flupentiofenox;

[0024] The bridged cyclic amine: Acynonapyr;

[0025] The quinoline class mentioned: Flometoquin;

[0026] The aforementioned quinazoline derivative: quinazoline;

[0027] The aforementioned pyridazinone derivative: pyridaben;

[0028] The benzoylurea compounds mentioned are: lufenuron, flufenoxuron, and diflubenzuron;

[0029] The methoxyacrylates mentioned are: pyrimethanil, fluopyram, and pyrimethanil;

[0030] The benzoic acid esters mentioned: Amidoflumet;

[0031] The pyrazoles mentioned are: acetamiprid, vaniliprole, and fipronil;

[0032] The pyrroles mentioned are: chlorfenapyr and bromonitrile;

[0033] The pyrimidine class mentioned: pyrimethanil;

[0034] The naphthoquinones mentioned above: acaricides;

[0035] The aforementioned pyridazine: pyridaben;

[0036] The pyrethroids mentioned are: cypermethrin, deltamethrin, cypermethrin, bifenthrin, flufenoxuron, and bromofenoxuron.

[0037] The aforementioned biological sources include: matrine, veratrine, azadirachtin, pyrethroids, rotenone, pine mites, and olive shark.

[0038] The aforementioned non-systemic organic nitrogen compounds include: bis(formamidin) and monoformamidin.

[0039] Other classes: at least one of the following insecticides and acaricides: Mivorilaner, Modoflaver, Tigolaner, Umifoxolaner, trifluralin, fluazinam, spinosad, and mineral oil.

[0040] Further, the water-based emulsion comprises the following components by mass percentage: 5%–30% flufenoxuron, 0%–20% of another active ingredient, 10%–30% solvent, 2%–8% surfactant, 1%–10% co-surfactant, 4%–8% antifreeze, 0.05%–0.2% preservative, and deionized water to bring the total to 100%.

[0041] Furthermore, the solvent is one or a combination of aromatic hydrocarbons, alkyl phthalates, alkylene carbonates, ionic liquids, and N-alkylpyrrolidones;

[0042] Further, the solvent is one or a combination of benzene, toluene, xylene, trimethylbenzene, mesitylene, methanol, ethanol, isopropanol, n-butanol, dimethyl sulfoxide, dimethylformamide, cyclohexanone, hydrocarbon carbonate, diesel, solvent oil, vegetable oil, vegetable oil derivatives, and water.

[0043] Furthermore, the solvent is trimethylbenzene or 200# solvent oil;

[0044] Furthermore, the surfactant is any one or a combination of block polyether, triphenylethylphenol polyoxyethylene polyoxypropylene ether, castor oil polyoxyethylene ether, arylphenol polyoxyethylene ether phosphate triethanolamine salt, Tween 80, fatty alcohol polyoxyethylene ether phosphate, and sodium polyacrylate.

[0045] Furthermore, the surfactant is a combination of castor oil polyoxyethylene ether, Tween 80, and fatty alcohol polyoxyethylene ether phosphate, or a combination of triphenylethylphenol polyoxyethylene polyoxypropylene ether, Tween 80, and triethanolamine salt of arylphenol polyoxyethylene ether phosphate.

[0046] Furthermore, the mass ratio of the surfactant is 3% to 7%;

[0047] Furthermore, the mass ratio of the surfactant is 3%, 4%, 5%, 6%, or 7%.

[0048] Furthermore, the mass ratio of castor oil polyoxyethylene ether, Tween 80, and fatty alcohol polyoxyethylene ether phosphate is 2:2:1.

[0049] Furthermore, the mass ratio of the triphenylethylphenol polyoxyethylene polyoxypropylene ether, Tween 80, and arylphenol polyoxyethylene ether phosphate triethanolamine salt is 2:2:1;

[0050] Furthermore, the co-surfactant is cyclohexanone, n-butanol, isooctyl alcohol, or propylene carbonate;

[0051] Furthermore, the antifreeze is selected from one or more of alcohols, alcohol ethers, chlorinated hydrocarbons, and inorganic salts;

[0052] Furthermore, the antifreeze agent is propylene glycol;

[0053] Furthermore, the preservative is one or a combination of propionic acid, sodium propionate, sorbic acid, sodium sorbate, potassium sorbate, benzoic acid, sodium benzoate, sodium p-hydroxybenzoate, methyl p-hydroxybenzoate, Kathon, BIT and 1,2-benzisothiazolin-3-one.

[0054] Furthermore, the preservatives are BIT-10 and BIT-20;

[0055] Furthermore, the active ingredient, solvent, surfactant, and co-surfactant are added together and stirred to dissolve into a homogeneous oil phase; deionized water, antifreeze, preservative, etc., are mixed to form an aqueous phase. While stirring, the oil phase is gradually added to the aqueous phase, stirred until homogeneous, and then subjected to high-speed homogenization shearing (10000 r / min, 5 min) to form an oil-in-water emulsion. Compared with the prior art, the beneficial effects of the technical solution of this invention are as follows:

[0056] 1) The formulation of this invention is reasonable and has good effect. The active ingredients are dispersed in water as extremely small droplets, with high dispersibility and large surface area. After application, the probability of contact with the target is increased, and the wetting, adhesion and penetration properties are greatly improved, resulting in better efficacy. It has excellent control effect on various plant-eating mites on agricultural and forestry crops.

[0057] 2) The pesticide emulsion of this invention greatly reduces the use of organic solvents and improves the safety of production, storage, transportation and users;

[0058] 3) It can save on pesticide use, reduce costs, promote the detoxication of highly toxic pesticides, and reduce environmental pollution. Detailed Implementation

[0059] This invention provides a water-based emulsion containing flufenoxuron, comprising the following components by weight percentage:

[0060] Table 1. Components and Contents of Water-Based Emulsions

[0061]

[0062]

[0063] Processing technology: The active ingredients, solvents, surfactants, and co-surfactants are added together and stirred to dissolve into a homogeneous oil phase; deionized water, antifreeze, preservatives, etc. are mixed to form an aqueous phase. Under stirring, the oil phase is gradually added to the aqueous phase, stirred evenly, and subjected to high-speed homogenization shearing to form an oil-in-water emulsion.

[0064] The effects of different solvents and cosolvents on water-based emulsions:

[0065] Table 2. Components and Contents of 10% Flufenoxam Water Emulsion

[0066] Components mass percentage Active ingredients Fluorosulfuron 10% solvent 15％、20％ surfactants EMULSON AG 603HB 5% Co-surfactants (co-solvents) Cyclohexanone 5% antifreeze 5% propylene glycol preservative BIT-20 0.1% Deionized water Replenish to 100%

[0067] Processing technology: The active ingredients, solvents, surfactants, and co-surfactants are added together and stirred to dissolve into a homogeneous oil phase; deionized water, antifreeze, preservatives, etc. are mixed to form an aqueous phase. Under stirring, the oil phase is gradually added to the aqueous phase, stirred evenly, and subjected to high-speed homogenization shearing to form an oil-in-water emulsion.

[0068] Experimental results:

[0069] Table 3. Results of screening tests for different solvents, co-solvents, and dosages.

[0070]

[0071]

[0072] The effects of different surfactants on water-based emulsions:

[0073] Table 4. Components and Contents of 10% Flufenoxam Water Emulsion

[0074] Components mass percentage Active ingredients Fluorosulfuron 10% solvent 10% trimethylbenzene + 10% 200# solvent oil surfactants 4％、4.5％、5％、6％ Co-surfactants Cyclohexanone 5% antifreeze 5% propylene glycol preservative BIT-20 0.1% Deionized water Replenish to 100%

[0075] Processing technology: The active ingredients, solvents, surfactants, and co-surfactants are added together and stirred to dissolve into a homogeneous oil phase; deionized water, antifreeze, preservatives, etc. are mixed to form an aqueous phase. Under stirring, the oil phase is gradually added to the aqueous phase, stirred evenly, and subjected to high-speed homogenization shearing to form an oil-in-water emulsion.

[0076] Experimental results:

[0077] Table 5 Results of tests using different solvents

[0078]

[0079]

[0080] Specific materials used in the above embodiments:

[0081] Table 6 Specific Product Models for Each Component

[0082]

[0083] Specific preparation example:

[0084] Preparation Example 1: 10% Flufenoxam aqueous emulsion

[0085] Formula composition: 10% flufenoxuron, 20% thallium, 2% castor oil polyoxyethylene ether, 2% Tween 80, 1% fatty alcohol polyoxyethylene ether phosphate, 5% cyclohexanone, 5% propylene glycol, 0.1% BIT-20, and deionized water to make up the balance;

[0086] Preparation method: Fluorosulfuron, solvent, surfactant, and co-surfactant are added together and stirred to dissolve into a homogeneous oil phase; deionized water, antifreeze, preservative, etc. are mixed to form an aqueous phase. Under stirring, the oil phase is gradually added to the aqueous phase and stirred evenly. High-speed homogenization shearing is then performed to form an oil-in-water emulsion product.

[0087] Preparation Example 2: 10% Flufenoxam aqueous emulsion

[0088] Formula composition: 10% flufenoxuron, 20% thallium, 1.8% castor oil polyoxyethylene ether, 1.8% Tween 80, 0.9% fatty alcohol polyoxyethylene ether phosphate, 5% cyclohexanone, 5% propylene glycol, 0.1% BIT-20, and deionized water to make up the balance;

[0089] Preparation method: Same as preparation 1.

[0090] Preparation Example 3: 10% Flufenoxam aqueous emulsion

[0091] Formula composition: 10% flufenoxuron, 20% methylbenzene, 2% triphenylethylphenol polyoxyethylene polyoxypropylene ether, 2% Tween 80, 1% arylphenol polyoxyethylene ether phosphate triethanolamine salt, 5% cyclohexanone, 5% propylene glycol, 0.1% BIT-20, and deionized water to make up the balance;

[0092] Preparation method: Same as preparation 1.

[0093] Preparation Example 4: 10% Flufenoxam aqueous emulsion

[0094] Formula composition: 10% flufenoxuron, 20% thallium, 2% castor oil polyoxyethylene ether, 2% Tween 80, 1% fatty alcohol polyoxyethylene ether phosphate, 1% block polyether, 5% cyclohexanone, 5% propylene glycol, 0.1% BIT-20, and deionized water to make up the balance;

[0095] Preparation method: Same as preparation 1.

[0096] Preparation Example 5: 10% Flufenoxam aqueous emulsion

[0097] Formula composition: 10% flufenoxuron, 20% thallium, 2% castor oil polyoxyethylene ether, 2% Tween 80, 1% arylphenol polyoxyethylene ether phosphate triethanolamine salt, 5% cyclohexanone, 5% propylene glycol, 0.1% BIT-20, and deionized water to make up the balance;

[0098] Preparation method: Same as preparation 1.

[0099] Preparation Example 6: 10% Flufenoxam aqueous emulsion

[0100] Formula composition: 10% flufenoxuron, 20% methylbenzene, 2% triphenylethylphenol polyoxyethylene polyoxypropylene ether, 1% arylphenol polyoxyethylene ether phosphate triethanolamine salt, 5% cyclohexanone, 5% propylene glycol, 0.1% BIT-20, and deionized water to make up the balance;

[0101] Preparation method: Same as preparation 1.

[0102] Control Example 1: 10% Flufenoxam aqueous emulsion

[0103] Formula composition: 10% flufenoxuron, 20% thallium, 5% TERMUL (5030), 5% cyclohexanone, 5% propylene glycol, 0.1% BIT-20, and deionized water to make up the balance;

[0104] Preparation method: Same as preparation 1.

[0105] Comparative Example 2: 10% Flufenoxam aqueous emulsion

[0106] Formula composition: 10% flufenoxuron, 20% thallium, 5% EMULSON AG 603HB, 5% cyclohexanone, 5% propylene glycol, 0.1% BIT-20, and deionized water to make up the balance;

[0107] Preparation method: Same as preparation 1.

[0108] Methods for testing the quality and physicochemical properties of pharmaceutical preparations:

[0109] Table 7. Basis for testing various indicators of the preparation.

[0110]

[0111] Quality test results of Preparation Examples 1-6 and Control Examples 1-2:

[0112] Table 8 Test Results

[0113]

[0114]

[0115] The results showed that the performance of Preparation Examples 1-6 was superior to that of Control Example 1 and Control Example 2 in all aspects. The low-temperature stability and thermal storage stability were both qualified, and there was no stratification or precipitation.

[0116] Surface tension measurement

[0117] The surface tension of the prepared drug solution (each preparation example and control example diluted 2000 times) was measured at room temperature using a JYW-200A liquid surface interfacial tension meter, and the result was repeated 3 times and the average value was taken.

[0118] Table 9 Surface tension measurement results

[0119] Serial Number Surface tension (mN / m) Preparation Example 1 35.15 Preparation Example 2 38.18 Preparation Example 3 38.47 Preparation Example 4 39.34 Preparation Example 5 39.95 Preparation Example 6 40.47 Compare with Example 1 41.22 Compare with Example 2 42.57

[0120] The test results show that:

[0121] Preparation Examples 1-6: Selecting a suitable emulsifier reduces the surface tension of the pesticide solution, which can improve the spread of pesticide emulsions on target crops, thereby improving the control effect of the pesticide on phytophagous mites.

[0122] Contact angle measurement

[0123] Droplet method: Collect the 5th fresh young citrus leaf that has just turned green from the newly sprouted shoots. Select a flat leaf and cut it into small pieces with scissors (avoiding the veins). Place the leaf flat on the front side in the sample cell of the droplet shape analyzer (DROP SHAPE ANALYZER-DSA25). Take 2 μL of each drug solution (each preparation example and control example diluted 2000 times) and drop it onto the leaf. After standing for 30 seconds, measure the contact angle. Repeat 3 times and take the average value.

[0124] Table 10 Results of Average Contact Angle Measurement

[0125] Serial Number Average contact angle Preparation Example 1 59.11° Preparation Example 2 70.25° Preparation Example 3 89.36° Preparation Example 4 82.18° Preparation Example 5 86.09° Preparation Example 6 71.76° Compare with Example 1 125.02° Compare with Example 2 131.13°

[0126] The experimental results showed that the preparations 1-6 could adhere well to citrus leaves and had good wettability.

[0127] Field efficacy testing

[0128] Field efficacy trial for controlling citrus red spider mites

[0129] Test crop: Citrus;

[0130] Test subject: Citrus red spider mite;

[0131] Test period: Mid-June 2023;

[0132] Test location: Ganzhou, Jiangxi Province;

[0133] Pest infestation: On average, there were more than 2 live mites per leaf;

[0134] Experimental fields: The soil fertility of the experimental sites was moderate, the terrain was flat, the fertility was uniform, and the irrigation conditions were good. The cultivation conditions (soil type, fertilization, tillage, row spacing, etc.) of all experimental plots were uniform and consistent with local agricultural practices (GAP).

[0135] Experimental design: The formulation treatment, control treatment, and blank control were arranged in a randomized block design, with a plot size of 2 citrus trees and each treatment was replicated 4 times.

[0136] Table 11 Experimental treatments and drug dosages

[0137]

[0138] Spraying method: Spray treatment. The spraying equipment is the WS-16D Guardian electric sprayer with a single fan-shaped mist nozzle. The working pressure is 0.15-0.4 MPa. According to the dosage requirements, the amount of pesticide should be accurately measured according to the area of ​​the plot.

[0139] The weather was good during the trial. On the day of the trial, it was cloudy with an average daily temperature of 23°C, a high of 26°C, a low of 18°C, a northerly wind of level 1, and a relative humidity of 65%.

[0140] Survey method: Mark the tender shoots of each tree in five directions (east, west, south, north, and center) in each plot. For each plot, mark 20 leaves on each tree and conduct the survey. The number of mites before treatment should not be less than 200. The number of live mites should be surveyed 3 days and 14 days after application of the pesticide.

[0141] Methods for calculating drug efficacy:

[0142]

[0143] Field trial results:

[0144] During the experiment, the citrus trees in each treatment plot grew well, and no pesticide damage was observed in any treatment.

[0145] Field trial results (Table 12) showed that different tested agents had good control effects on citrus red spider mites, and preparations 1-3 showed good rapid efficacy 3 days after application.

[0146] Table 12 Results of field trials on citrus red spider mite using different tested pesticides

[0147]

[0148] Note: The efficacy (%) in the table above is the average of each replicate. Lowercase letters indicate significant differences at the 5% level, and uppercase letters indicate significant differences at the 1% level.

[0149] Field trial results (Table 13) showed that different tested pesticides had good control effects on citrus red spider mites, with preparations 1-3 exhibiting good residual efficacy. The experimental data were processed using Duncan's multiple range method, and the analysis of variance results showed that at the 0.01 and 0.05 levels, preparations 1-3 were significantly different from the control group.

[0150] Table 13 Results of field trials on citrus red spider mite using different tested pesticides

[0151]

[0152] According to the experimental results, when citrus red spider mites first appear, the use of various compound acaricides can effectively control their damage in a short period of time and reduce the economic losses caused by pests to citrus. It is recommended that the pesticides be sprayed evenly, with a focus on spraying the undersides of the leaves.

[0153] The water-in-oil pesticide emulsion of this invention shows significant control efficacy against citrus red spider mites, and is superior to single-agent formulations in delaying the development of resistance and prolonging pesticide retention. Furthermore, no phytotoxicity was observed in the experiments with the combined pesticide, indicating that the improved synergistic effect of the resulting pesticide composition or formulation can reduce production and usage costs while ensuring crop safety.

[0154] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements 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 pesticide emulsion, characterized in that, The water-in-oil emulsion comprises the following components by mass percentage: 1%–40% flufenoxuron, 0%–40% other active ingredients, 1%–30% solvent, 0.5%–10% surfactant, 0.2%–15% co-surfactant, 0–10% antifreeze, 0–0.5% preservative, and deionized water to bring the total to 100%. Other active ingredients include one or more of insecticides, acaricides, fungicides, or herbicides.

2. The water-in-oil emulsion according to claim 1, characterized in that, The water-in-oil emulsion comprises the following components by mass percentage: 5%–30% flufenoxuron, 0%–20% other active ingredients, 10%–30% solvent, 2%–8% surfactant, 1%–10% co-surfactant, 4%–8% antifreeze, 0.05%–0.2% preservative, and deionized water to bring the total to 100%. Other active ingredients include one or more insecticides and acaricides.

3. The water-based emulsion according to claim 1, characterized in that, The solvent is one or a combination of aromatic hydrocarbons, alkyl phthalates, alkylene carbonates, ionic liquids, and N-alkylpyrrolidones. Preferably, the solvent is trimethylbenzene or 200# solvent oil.

4. The water-based emulsion according to claim 1, characterized in that, The surfactant is any one or a combination of block polyether, triphenylethylphenol polyoxyethylene polyoxypropylene ether, castor oil polyoxyethylene ether, arylphenol polyoxyethylene ether phosphate triethanolamine salt, Tween 80, fatty alcohol polyoxyethylene ether phosphate, and sodium polyacrylate.

5. The water-based emulsion according to claim 4, characterized in that, The surfactant is a combination of castor oil polyoxyethylene ether, Tween 80, and fatty alcohol polyoxyethylene ether phosphate, or a combination of triphenylethylphenol polyoxyethylene polyoxypropylene ether, Tween 80 arylphenol polyoxyethylene ether phosphate, and triethanolamine salt.

6. The water-in-oil emulsion according to claim 1, characterized in that, The surfactant is present in a mass ratio of 3% to 7%.

7. The water-in-oil emulsion according to claim 1, characterized in that, The co-surfactant is cyclohexanone, n-butanol, isooctanol, or propylene carbonate; The mass ratio of the solvent to the co-surfactant is 2:1 to 6:

1.

8. The water-based emulsion according to claim 1, characterized in that, The antifreeze agent is propylene glycol.

9. The water-in-oil emulsion according to claim 1, characterized in that, The preservatives mentioned are BIT-10 and BIT-20.

10. The method for preparing the water-in-oil emulsion according to any one of claims 1-9, characterized in that, The active ingredients, solvents, surfactants, and co-surfactants are added together and stirred to dissolve into a homogeneous oil phase. Deionized water, antifreeze, preservatives, etc. are mixed to form an aqueous phase. Under stirring, the oil phase is gradually added to the aqueous phase, stirred evenly, and subjected to high-speed homogenization shearing to form an oil-in-water emulsion.

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