Method for improving the fungicidal and insecticidal efficiency of vegetables

Abstract

This invention discloses a pesticide adjuvant composition for improving the efficiency of fungicide and insecticide application in vegetables, as well as its preparation and application methods. The composition comprises deionized water, a plant wax layer oil phase precursor A, a pathogen and insect surface lipid layer oil phase precursor B, anhydrous magnesium sulfate, and ammonia. The ammonia is used to adjust the pH to a weakly alkaline state, promoting the in-situ reversible formation of magnesium hydroxide sol from magnesium ions. This reduces the compression of the double electric layer by divalent cations, improving the stability of the mixture in high-hardness water. During spraying and atomization, the ammonia gas dissipates, causing a decrease in the pH of the microenvironment. The magnesium hydroxide dissolves, releasing free magnesium ions, triggering salting-out and demulsification. The free straight-chain alkanes and animal fat components after phase separation undergo hydrophobic fusion and lipid partitioning with the hydrophobic leaf surface of vegetables and the epidermis of pathogens and insects, respectively, increasing the amount of pesticide retained on upright leaves and promoting the transmembrane absorption and translocation of the pesticide's active ingredients.

Description

Technical Field

[0001] This invention relates to the field of pesticide formulation technology, specifically a method for improving the efficiency of bactericidal and insecticidal action on vegetables. Background Technology

[0002] The leaves of crops such as onions typically grow upright and are covered with a hydrophobic waxy layer and cuticle layer with low polarity. In pest and disease control operations, conventional water-based pesticide droplets have a large contact angle when they come into contact with such leaf surfaces, making it difficult to effectively wet them. To improve wetting performance, current application schemes often add surfactants such as organosilicon to the pesticide solution to reduce surface tension. However, excessive reduction of surface tension can cause the pesticide solution to spread into a continuous water film on the upright leaf surface, which then converges and slides off under gravity, resulting in a low actual amount of pesticide retained on the target leaf surface. This leads to a waste of the active ingredients in the pesticide and increases the environmental burden.

[0003] In addition to the problem of retention on plant leaves, pesticide active ingredients also need to overcome the physiological barriers on the surface of pathogens and pests to exert their effects. The outer epidermis of pests such as onion thrips and the outer surface of spores of fungi such as downy mildew both have hydrophobic lipid layers or mold layers. Conventional water-soluble pesticides or adjuvants that rely on physical stress-reducing mechanisms to take effect lack the affinity and penetration medium for the lipid layer of biological targets, making it difficult for active molecules to cross the hydrophobic barrier and enter the target's internal action site, thus limiting the lethality and ultimate control efficacy of pesticides.

[0004] In actual field application, groundwater or surface water is often used to prepare mixed pesticide solutions. These water sources usually contain high concentrations of divalent cations such as calcium and magnesium, resulting in high water hardness. When conventional pesticide emulsions or adjuvants come into contact with high-hardness water, the free divalent cations compress the anionic diffusion double layer of the surfactant, weakening the electrostatic repulsion between droplets. This can easily lead to premature aggregation and phase separation of the emulsion in the sprayer's tank, reducing the macroscopic uniformity of the pesticide solution. The precipitated flocculants or oil phase can also clog nozzles and pipelines, affecting the normal operation of spraying. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for improving the sterilization and insecticidal efficiency of vegetables, solving the problem that pesticide adjuvants cause premature aggregation and phase separation of emulsions in the pesticide tank when in contact with high-hardness water.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables, comprising the following components in parts by weight: 20-40 parts of basic deionized water; 12.5-30 parts of plant wax layer oil phase precursor A; 5-15 parts of industrial paraffin; 4.5-14.3 parts of fatty alcohol polyoxyethylene ether; 3-5.7 parts of sodium dodecylbenzenesulfonate; 15-25 parts of insect and disease surface lipid layer oil phase precursor B; 5-15 parts of animal fat; 7.14-15.56 parts of egg yolk lecithin; 2.86-4.44 parts of sodium dodecylbenzenesulfonate; 2.5-6 parts of anhydrous magnesium sulfate; 16-28.5 parts of deionized water as a solvent for dissolving anhydrous magnesium sulfate; and 1.5-3 parts of ammonia.

[0007] By adopting the above technical solution, a controlled metastable emulsion system and a dynamic delayed demulsification response mechanism can be constructed by using a specific mass ratio of anhydrous magnesium sulfate and ammonia. The microenvironment phase transition reaction process of this composition is divided into the following steps: The pH of the composition is controlled in the weakly alkaline range of 8.5 to 9.5. Under this alkaline environment, free divalent magnesium ions in the aqueous phase undergo a reversible precipitation titration reaction with hydroxide ions, generating extremely fine magnesium hydroxide sol in situ. This chemical equilibrium significantly reduces the concentration of free magnesium ions in the continuous phase, temporarily relieving the excessive compression of the surfactant anion diffusion double layer by divalent cations, providing a period of physical stability for tank mixing, and preventing premature flocculation in high-hardness water. When the liquid medicine is sprayed from the nozzle and atomized, the specific surface area increases, and the volatile ammonia molecules inside quickly escape into the air. The escape of ammonia molecules causes the pH value of the droplet microenvironment to drop sharply to neutral or slightly acidic when it comes into contact with the leaf surface. As the pH value drops sharply, the magnesium hydroxide particles generated in situ inside dissolve rapidly, instantly releasing a large number of free magnesium ions. The high concentration of divalent magnesium ions strongly compresses the metastable anion diffusion double layer, eliminating the electrostatic repulsion between droplets and triggering irreversible, rapid salting-out demulsification and phase separation of the emulsion.

[0008] Preferably, the targeted plant waxy layer oil phase precursor A is used to release straight-chain alkane components after salting-out and demulsification.

[0009] By adopting the above technical solution, after phase separation, the in-situ released straight-chain alkanes match the cuticle and hydrophobic wax layer of the epidermis of onion vegetables in terms of chemical polarity and surface energy. Based on the intermolecular van der Waals forces, hydrophobic fusion occurs, forming a fixed physical anchoring point at the interface between the droplet and the upright leaf surface. The adhesion force of this physical interface overcomes the gravitational component of the droplet sliding down the upright smooth surface, thereby increasing the absolute retention of the pesticide on the leaf surface.

[0010] Preferably, the target insect surface lipid layer oil phase precursor B is used to release animal fat components rich in triglycerides after salting out and demulsification.

[0011] By adopting the above technical solution, the animal fat component released after phase separation contains a large amount of triglycerides. The carbon chain structure of the triglyceride molecules has a physicochemical affinity with the lipid layer of the insect epidermis and the spore layer of fungi. The released animal fat acts as a carrier medium, generating a lipid partitioning and penetration effect at the biological target interface. It carries the active pesticide molecules dissolved in the oil phase across the hydrophobic physiological barrier and into the internal tissue of the target, thereby increasing the transmembrane absorption of the active pesticide components and the biological lethality rate.

[0012] Preferably, the industrial paraffin has a carbon chain length distribution between C20 and C35, a melting point range of 50°C to 65°C, and a CAS number of 8002-74-2; the fatty alcohol polyoxyethylene ether has a CAS number of 68131-39-5; the sodium dodecylbenzenesulfonate has a CAS number of 25155-30-0; the egg yolk lecithin has a phosphatidylcholine purity of not less than 60% and a CAS number of 8002-43-5; the anhydrous magnesium sulfate has a CAS number of 7487-88-9; and the ammonia solution has a CAS number of 1336-21-6.

[0013] By adopting the above technical solution, the specific physicochemical parameters and purity of each component are limited, ensuring that industrial paraffin and animal fats can undergo the expected phase change melting and cooling solidification process at a specific temperature, while ensuring that the charge regulation capabilities of various surfactants and salting-out triggers meet the calculation expectations of the double-layer compression theory.

[0014] Preferably, the pesticide adjuvant composition is a milky white metastable solid lipid dispersion with an overall zeta potential stable between -25mV and -35mV.

[0015] By adopting the above technical solution, the Zeta potential is strictly controlled within the range of -25mV to -35mV, so that the colloid is in the critical edge state of aggregation. This state not only retains the basic electrostatic repulsion force to maintain the macroscopic uniformity during static storage and tank mixing, but also shortens the energy threshold required for demulsification after drug application, ensuring that phase separation can occur extremely quickly when the microenvironment pH drops sharply.

[0016] A method for preparing a pesticide adjuvant composition for improving the fungicidal and insecticidal efficiency of vegetables includes the following steps: S1 heats the base deionized water and, under high-speed shearing, injects the hot-melted target plant wax layer oil phase precursor A and the target insect surface lipid layer oil phase precursor B into the base deionized water at a uniform speed to form a micron-sized emulsion. S2 rapidly cools the micron-sized emulsion, causing the lipid precursors in the dispersed phase to cool and solidify; then, it switches to low-speed stirring and slowly adds anhydrous magnesium sulfate aqueous solution, while monitoring and controlling the Zeta potential to the critical coagulation value in real time. S3 maintains low-speed stirring, slowly adds 25% ammonia water dropwise, adjusts the pH value to weakly alkaline, and then discharges the product.

[0017] By employing the above technical solution, the heating and high-shear process ensures the oil-in-water phase transfer of the lipid precursor and refines the particle size of the dispersed phase. The rapid cooling step causes the molten lipids inside the dispersed phase to undergo a phase transition and solidify, transforming the liquid emulsion into a solid lipid dispersion and locking the dispersed phase morphology. By stepwise addition of anhydrous magnesium sulfate and ammonia, divalent cations are first introduced to compress the electric double layer to reach the metastable threshold, and then an alkaline regulator is introduced to block free ions, achieving precise locking of chemical growth and stable state.

[0018] Preferably, in S1, the heating temperature of the basic deionized water is constant at 60-65℃, the rotation speed of the high-shear disperser is set at 3000-5000 r / min, and the high-shear maintenance time is 15-30 minutes; in S2, the cooling rate is controlled at 2-5℃ / min, and the target cooling temperature is 25-35℃; the dropping time of the anhydrous magnesium sulfate aqueous solution is controlled to be uniformly added within 15-20 minutes, and the Zeta potential is between -25mV and -35mV after the total amount is added.

[0019] By employing the above technical solution, a constant temperature of 60-65℃ is set, higher than the melting point of the lipid precursor, to ensure efficient liquid-liquid dispersion. A forced cooling rate of 2-5℃ / min and a cooling endpoint of 25-35℃ are set to ensure rapid crystallization and solidification of the lipid droplets without thermodynamic aggregation. A slow, uniform dropping time of 15-20 minutes allows for uniform diffusion of magnesium ions in the continuous phase, preventing excessively high local salt-out concentrations that could lead to irreversible demulsification. This ensures the precise preparation of a metastable liquid with the required Zeta potential.

[0020] A method of using a pesticide adjuvant composition for improving the efficiency of fungicide and insecticide use on vegetables, comprising the following steps: When using, the pesticide adjuvant composition, pesticide technical and dilution water are added to the tank of the application device for mixing in proportion. Then, the mixed solution is sprayed onto the surface of onion vegetables under a system pressure of 0.2-0.5 MPa.

[0021] By adopting the above technical solution, under a system pressure of 0.2-0.5 MPa, the hydrodynamic shear force synergistically accelerates the local deformation of the droplet interface film. This mechanical deformation is superimposed on the chemical phase change reaction induced by the aforementioned ammonia gas emission, further shortening the demulsification response time after the liquid comes into contact with the leaf surface.

[0022] Preferably, the mixed solution is prepared by mixing the pesticide adjuvant composition with the pesticide technical and dilution water at a mass ratio of 1:500 to 1:1000.

[0023] By adopting the above technical solution, this specific dilution ratio range can ensure that there are sufficient volatile ammonia molecules inside the droplets to maintain pH stability before spraying, and can also ensure that the water per unit volume evaporates quickly after spraying, triggering the phase change anchoring mechanism. At this dilution ratio, the concentration of precipitated lipids is sufficient to cover the surface of the microenvironment target, and will not increase the viscosity burden of the drug delivery device tubing.

[0024] Preferably, the pesticide technicals are acetamiprid technical with a purity of not less than 97% and CAS number 135410-20-7, and tebuconazole technical with a purity of not less than 97% and CAS number 107534-96-3.

[0025] By adopting the above technical solution, specific high-purity insecticide and fungicide molecules are clearly matched. The molecular structures of acetamiprid and tebuconazole can be stably dissolved and distributed in the lipid carrier precipitated after phase separation. Through the dual lipid affinity mechanism, efficient penetration and transduction against pests and diseases of onion vegetables are achieved simultaneously.

[0026] This invention provides a method for improving the sterilization and insecticidal efficiency of vegetables. It has the following beneficial effects: 1. This invention utilizes the combined application of anhydrous magnesium sulfate and ammonia in the formulation to maintain a weakly alkaline state, promoting the combination of free magnesium ions and hydroxide ions to form reversible magnesium hydroxide sol. This reaction reduces the concentration of divalent cations in the continuous phase, weakens their compression effect on the double layer of anionic surfactants, prevents flocculation or phase separation of the drug solution before preparation and application, and ensures the smooth flow of the application equipment's pipeline.

[0027] 2. When the mixed medicine is sprayed and atomized, the volatilization of ammonia molecules causes a decrease in the pH value of the microenvironment. The dissolution of magnesium hydroxide releases magnesium ions, triggering salting out and demulsification. The industrial paraffin components released after phase separation have a straight-chain alkane structure that matches the cuticle and wax layer of the vegetable epidermis in terms of chemical polarity. Through van der Waals forces, physical adhesion is generated at the contact interface, overcoming the tendency of droplets to flow due to gravity on smooth leaf surfaces.

[0028] 3. The animal fat component precipitated after phase change demulsification in this invention contains triglycerides. Its carbon chain structure has physicochemical affinity with the fungal spore layer and the lipid layer of the insect epidermis. The animal fat acts as a medium to generate a lipid partitioning effect at the biological target interface, carrying pesticide active molecules such as acetamiprid or tebuconazole across the hydrophobic layer of the target and into the internal tissue, thereby improving the transmembrane absorption rate and final efficacy of the drug. Attached Figure Description

[0029] Figure 1This is a step diagram of the present invention. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The main raw materials and reagents used in the following examples and comparative examples have the following sources and specifications. Reagents not specifically mentioned are all commercially available analytical grade or higher grade products.

[0032] Industrial paraffin has a carbon chain length between C20 and C35, a melting point range of 50°C to 65°C, and CAS number 8002-74-2. The animal fat is a mixture of beef tallow or mutton tallow, with a melting point range of 35°C to 50°C and CAS number 61789-97-7. The nonionic surfactant selected is fatty alcohol polyoxyethylene ether, CAS number 68131-39-5; The anionic surfactant selected is sodium dodecylbenzene sulfonate, CAS number 25155-30-0; The natural zwitterionic emulsifier is egg yolk lecithin, and the phosphatidylcholine purity is not less than 60%, with CAS number 8002-43-5; Anhydrous magnesium sulfate was selected as the salting-out trigger, with CAS number 7487-88-9; The volatile pH adjuster used is a 25% (w / w) ammonia solution, CAS number 1336-21-6; The agricultural silicone surfactant used in the comparative example is polyether-modified trisiloxane, CAS number 27306-78-1. The pesticide technicals used in the test were acetamiprid technical, with a purity of not less than 97% and CAS number 135410-20-7, and tebuconazole technical, with a purity of not less than 97% and CAS number 107534-96-3.

[0033] Preparation Example 1: This preparation example provides a method for preparing a target plant waxy layer oil phase precursor A1, including the following steps: Ten parts of industrial paraffin, ten parts of fatty alcohol polyoxyethylene ether, and five parts of sodium dodecylbenzenesulfonate were added to a reaction vessel. The heating was turned on to raise the temperature to 80°C. Mechanical stirring was started under anhydrous conditions, and the speed was controlled at 300 r / min. The mixture was kept at a constant temperature and stirred for 35 minutes until the solid lipids were completely melted and formed a homogeneous and transparent liquid mixture with the emulsifier. This yielded the targeted plant wax layer oil phase precursor A1.

[0034] Preparation Example 2: This preparation example provides a method for preparing the target plant wax layer oil phase precursor A2, including the following steps: Five parts of industrial paraffin, 4.5 parts of fatty alcohol polyoxyethylene ether, and 3 parts of sodium dodecylbenzenesulfonate were added to a reaction vessel. The heating was turned on to raise the temperature to 75°C. Mechanical stirring was started under anhydrous conditions, and the speed was controlled at 200 r / min. The mixture was kept at a constant temperature and stirred for 30 minutes until the solid lipids were completely melted and formed a homogeneous and transparent liquid mixture with the emulsifier. This yielded the targeted plant wax layer oil phase precursor A2.

[0035] Preparation Example 3: This preparation example provides a method for preparing the target plant wax layer oil phase precursor A3, including the following steps: 15 parts of industrial paraffin, 14.3 parts of fatty alcohol polyoxyethylene ether, and 5.7 parts of sodium dodecylbenzenesulfonate were added to a reaction vessel. The heating was turned on to raise the temperature to 85°C. Mechanical stirring was started under anhydrous conditions, and the speed was controlled at 400 r / min. The mixture was kept at a constant temperature and stirred for 45 minutes until the solid lipids were completely melted and formed a homogeneous and transparent liquid mixture with the emulsifier. This yielded the targeted plant wax layer oil phase precursor A3.

[0036] Preparation Example 4: This preparation example provides a method for preparing oil-phase precursor B1 targeting the lipid layer of the parasite's surface, including the following steps: Ten parts of animal fat, 11.25 parts of egg yolk lecithin, and 3.75 parts of sodium dodecylbenzenesulfonate were added to a reaction vessel. The heating was turned on to raise the temperature to 75°C. Mechanical stirring was started under anhydrous conditions, with the speed controlled at 300 r / min. The mixture was kept at a constant temperature and stirred for 35 minutes until the solid lipids were completely melted and formed a homogeneous and transparent liquid mixture with the emulsifier. This yielded the oil phase precursor B1 targeting the lipid layer of the diseased insect body surface.

[0037] Preparation Example 5: This preparation example provides a method for preparing oil-phase precursor B2 targeting the lipid layer of the parasite's surface, including the following steps: Five parts of animal fat, 7.14 parts of egg yolk lecithin, and 2.86 parts of sodium dodecylbenzenesulfonate were added to a reaction vessel. The heating was turned on and the temperature was raised to 70°C. Mechanical stirring was started under anhydrous conditions, and the speed was controlled at 200 r / min. The mixture was kept at a constant temperature and stirred for 30 minutes until the solid lipids were completely melted and formed a homogeneous and transparent liquid mixture with the emulsifier. This yielded the oil phase precursor B2 targeting the lipid layer of the diseased insect body surface.

[0038] Preparation Example 6: This preparation example provides a method for preparing oil-phase precursor B3 targeting the lipid layer of the parasite's surface, including the following steps: 15 parts of animal fat, 15.56 parts of egg yolk lecithin, and 4.44 parts of sodium dodecylbenzenesulfonate were added to a reaction vessel. The heating was turned on to raise the temperature to 80°C. Mechanical stirring was started under anhydrous conditions, and the speed was controlled at 400 r / min. The mixture was kept at a constant temperature and stirred for 45 minutes until the solid lipids were completely melted and formed a homogeneous and transparent liquid mixture with the emulsifier. This yielded the oil phase precursor B3 targeting the lipid layer of the diseased insect body surface.

[0039] Example 1: This example provides a pesticide adjuvant composition for allium vegetables based on dual lipid affinity and dynamic salting-out demulsification, see attached figure. Figure 1 This includes the following steps: Take 30 portions of deionized water and put them into the main reactor. Turn on the heating to keep the water temperature constant at 62°C. Start the high shear disperser and set the speed to 4000 r / min. Through the heat-insulated conveying pipeline, slowly and uniformly inject the hot-melt targeted plant wax layer oil phase precursor A1 obtained in Preparation Example 1 and the hot-melt targeted disease and insect body surface lipid layer oil phase precursor B1 obtained in Preparation Example 4 into the aqueous phase of the main reactor. After the feeding is complete, maintain a high shear state for 20 minutes to induce phase transfer and form a water-in-oil micron-sized emulsion. Turn off the heating and introduce cooling water to rapidly cool the emulsion to 30°C at a cooling rate of 3°C / min. At this point, the lipid precursor in the dispersed phase undergoes cooling and solidification, transforming into a milky-white metastable solid lipid dispersion. Switch the stirring mode to low-speed anchor stirring at 100 r / min. Dissolve 4 parts of anhydrous magnesium sulfate in 24 parts of deionized water to prepare a salt solution, and add it slowly and uniformly to the cold emulsion using a metering pump over 15 to 20 minutes. The zeta potential was monitored in real time during the dropwise addition. When the total amount was added, the zeta potential stabilized at -30mV, forming a metastable emulsion. The mixture was stirred at 30℃ and 100r / min. Two parts of ammonia water with a mass fraction of 25% were slowly added dropwise. After the addition was completed, the pH value increased and stabilized at around 9.0. The mixture was stirred for another 10 minutes before being discharged to obtain the concentrated pesticide adjuvant composition.

[0040] Example 2: This example provides a pesticide adjuvant composition for allium vegetables based on dual lipid affinity and dynamic salting-out demulsification, comprising the following steps: Take 40 portions of deionized water and put them into the main reactor. Turn on the heating to keep the water temperature constant at 60°C. Start the high shear disperser and set the speed to 3000 r / min. Through the heat-insulated conveying pipeline, slowly and uniformly inject the hot-melt targeted plant wax layer oil phase precursor A2 obtained in Preparation Example 2 and the hot-melt targeted disease and insect body surface lipid layer oil phase precursor B2 obtained in Preparation Example 5 into the aqueous phase of the main reactor. After the feeding is complete, maintain a high shear state for 15 minutes to induce phase transfer and form a water-in-oil micron-sized emulsion. Turn off the heating and introduce cooling water to cool the emulsion to 25°C at a cooling rate of 2°C / min. At this point, the lipid precursor in the dispersed phase cools and solidifies, transforming into a metastable solid lipid dispersion with a milky white appearance. Switch the stirring mode to low-speed anchor stirring at a speed of 50 r / min. Dissolve 2.5 parts of anhydrous magnesium sulfate in 28.5 parts of deionized water to prepare a salt solution, and slowly add it dropwise to the cold emulsion using a metering pump over a period of 15 to 20 minutes. The zeta potential was monitored in real time during the dripping process. After the full amount was added, the zeta potential stabilized at -25mV, forming a metastable emulsion. The mixture was stirred at 25°C and 50r / min. 1.5 parts of 25% ammonia water were slowly added dropwise, and the pH value was monitored in real time. When the pH value reached 8.5, the dripping was stopped. After stirring for another 10 minutes, the mixture was discharged to obtain the concentrated pesticide adjuvant composition.

[0041] Example 3: This example provides a pesticide adjuvant composition for allium vegetables based on dual lipid affinity and dynamic salting-out demulsification, comprising the following steps: Take 20 portions of deionized water and put them into the main reactor. Turn on the heating to keep the water temperature constant at 65°C. Start the high shear disperser and set the speed to 5000 r / min. Through the heat-insulated conveying pipeline, slowly and uniformly inject the hot-melt targeted plant wax layer oil phase precursor A3 obtained in Preparation Example 3 and the hot-melt targeted insect body surface lipid layer oil phase precursor B3 obtained in Preparation Example 6 into the aqueous phase of the main reactor. After the feeding is complete, maintain a high shear state for 30 minutes to induce phase transfer and form a water-in-oil micron-sized emulsion. Turn off the heating and introduce cooling water to rapidly cool the emulsion to 35°C at a cooling rate of 5°C / min. At this point, the lipid precursor in the dispersed phase undergoes cooling and solidification, transforming into a metastable solid lipid dispersion with a milky white appearance. Switch the stirring mode to low-speed anchor stirring at a speed of 150 r / min. Dissolve 6 parts of anhydrous magnesium sulfate in 16 parts of deionized water to prepare a salt solution, and slowly add it dropwise to the cold emulsion using a metering pump over a period of 15 to 20 minutes. The zeta potential was monitored in real time during the dripping process. After the full amount was added, the zeta potential stabilized at -35mV, forming a metastable emulsion. The mixture was stirred at 35°C and 150r / min. Three parts of ammonia water with a mass fraction of 25% were slowly added dropwise. The pH value was monitored in real time. When the pH value reached 9.5, the dripping was stopped. After stirring for another 10 minutes, the mixture was discharged to obtain the concentrated pesticide adjuvant composition.

[0042] Comparative Example 1 differs from Example 1 in that it does not add anhydrous magnesium sulfate, a salting-out trigger, and the anhydrous magnesium sulfate in the third step is replaced with an equal mass of deionized water; all other aspects are the same.

[0043] Comparative Example 2 differs from Example 1 in that no volatile pH adjuster is added, and the 25% ammonia solution in step 4 is replaced with an equal mass of deionized water; all other aspects are the same.

[0044] Comparative Example 3 differs from Example 1 in that the 25% ammonia solution in step 4 is replaced with an equimolar concentration of non-volatile inorganic alkali sodium hydroxide aqueous solution; all other aspects are the same.

[0045] Comparative Example 4 differs from Example 1 in that industrial paraffin was not added when preparing the targeted plant waxy layer oil phase precursor A1; instead, it was replaced with an equal mass of deionized water. All other aspects remained the same.

[0046] Comparative Example 5 differs from Example 1 in that, when preparing the oil-phase precursor B1 targeting the lipid layer of the parasite, animal fat was not added and was replaced with an equal mass of deionized water; all other aspects remained the same.

[0047] Comparative Example 6 differs from Example 1 in that the first step of anhydrous thermal melting molecular-level activation is omitted. Instead, solid industrial paraffin wax, animal fats, emulsifiers, anhydrous magnesium sulfate, ammonia, and deionized water are directly added to the main reactor and heated to 62°C for high-shear dispersion. The amounts of all other components are the same.

[0048] Comparative Example 7 provides a conventional pesticide adjuvant that directly uses commercially available agricultural organosilicon surfactant polyether-modified trisiloxane as a substitute.

[0049] Test Example 1: Take 50 mL of each of the emulsions from Examples 1 to 3 after high shear phase transfer emulsification and cooling to the corresponding target temperature in the preparation steps. At this time, salt water and ammonia water have not been added. Use a Zeta potential analyzer to measure the initial Zeta potential at the corresponding temperature, and use a high-precision benchtop pH meter to measure the initial pH value. Simulate the dropping conditions of Examples 1 to 3, add magnesium sulfate aqueous solution of corresponding concentration to each of the above emulsions at a specified rate. After the dropping is completed, stir at a constant temperature and low speed for 10 minutes to ensure uniform ion diffusion. Take samples again, use a Zeta potential analyzer to measure the Zeta potential after adding saline, and use a pH meter to measure the pH value after adding saline. Continue to simulate the steps of Examples 1 to 3, add the corresponding amount of 25% ammonia water dropwise, and after the addition is completed and stirring is continued for 10 minutes, take a third sample to measure the final Zeta potential and pH value. As a control, the final products of Comparative Examples 1, 2 and 3 after completing all preparation processes were taken, and their Zeta potential and pH value were measured respectively. Each test sample was measured in parallel 3 times, and the arithmetic mean was taken.

[0050] Table 1. Results of Zeta potential and pH value measurements for each example and comparative example.

[0051] According to the data in Table 1, the absolute values ​​of the initial Zeta potentials after phase transfer emulsification in Examples 1 to 3 were all greater than 50 mV, indicating that the anion diffusion double layer composed of sodium dodecylbenzenesulfonate was in a highly extended state and the emulsion had a strong electrostatic repulsion force.

[0052] When anhydrous magnesium sulfate was introduced, the absolute value of the Zeta potential in each embodiment decreased significantly, dropping to -29.6 mV, -25.3 mV, and -34.8 mV, respectively. This change directly reflects the strong compression effect of divalent magnesium ions on the anion diffuse double layer. The Zeta potential was tuned to the range of -25 mV to -35 mV, which is consistent with the critical edge state of colloidal aggregation in DLVO theory. This proves that thermodynamically, it has successfully entered the expected metastable state. At this time, the electrostatic repulsion between droplets is greatly reduced, but since it has not completely dropped to zero potential, macroscopic flocculation of the emulsion has not occurred.

[0053] After adding ammonia, the pH values ​​of Examples 1 to 3 rapidly increased from near neutral to a weakly alkaline range of 8.56 to 9.47. Accompanying the increase in pH, the absolute value of the final Zeta potential showed a slight rebound. This is because the alkaline environment caused the residual anionic surfactant sulfonic acid groups to maintain a high degree of ionization, which temporarily increased the surface charge density. At the same time, the free ammonia molecules formed a weak coordination complex with some magnesium ions in the water, which weakened the further compression effect of free magnesium ions on the electric double layer. This data confirms that the ammonia blocking mechanism can effectively prevent the evolution towards deep demulsification, providing a chemical basis for the subsequent resistance to hard water mixing stability.

[0054] The comparative data further verified the above mechanism. In Comparative Example 1, due to the absence of anhydrous magnesium sulfate, the final Zeta potential was as high as -57.6mV, indicating a highly stable state without metastable formation. In Comparative Example 2, due to the lack of ammonia adjustment, the final pH remained at 6.72, and the Zeta potential was maintained at the critical value of -30.1mV. Without the protection of weak alkalinity and ammonia complexation, it was highly susceptible to external ion interference and precipitation. Comparative Example 3 used non-volatile inorganic alkali sodium hydroxide, which also achieved a pH increase and a slight recovery of the Zeta potential. However, because sodium hydroxide could not volatilize during the spraying process, it could not trigger the rapid salting-out demulsification caused by a sudden drop in pH. The data from Examples 1 to 3 collectively show that the present invention successfully constructed a controlled metastable emulsion system through the synergistic effect of magnesium ions and ammonia at a specific concentration.

[0055] Test Example 2: The adjuvant composition samples of Examples 1 to 3 and Comparative Examples 1, 3 and 7 were mixed with deionized water at a volume ratio of 1:100 to prepare a simulated application solution. The test was conducted in a constant temperature and humidity chamber with an ambient temperature of 25℃ and a relative humidity of 55%. A backpack electric sprayer equipped with a standard fan-shaped nozzle was used, and the working pressure was set to 0.3MPa. The miniature fast-response pH composite electrode was fixed to the lower end of an inclined polytetrafluoroethylene collection plate 50 cm away from the nozzle. The sprayed droplets were allowed to converge along the plate surface and immediately contact the electrode. The spraying was started, and the microenvironment pH value was continuously recorded at 0 seconds, 5 seconds, 10 seconds, 20 seconds, and 30 seconds after the liquid left the nozzle and contacted the electrode. While monitoring pH, a micro-peristaltic pump at the bottom of the collection plate draws the newly contacted drug solution into the flow cell of a UV-Vis spectrophotometer in real time. The test wavelength is set to 600 nm, and the transmittance changes at corresponding time points are continuously recorded. The undemulsified O / W micron-sized emulsion has strong full-band light scattering and exhibits low transmittance. After the demulsified phase is separated, a large number of oil droplets precipitate, aggregate, and float to the surface, and the continuous phase becomes clear, resulting in a step increase in transmittance. Each of the above tests was performed in parallel three times. Before each spray, the test pipeline and flow cell were cleaned and dried with nitrogen. The arithmetic mean of the three test data was taken.

[0056] Table 2. Results of dynamic changes in pH value and transmittance during simulated spraying for each sample.

[0057] According to the data in Table 2, the diluted drug solutions of Examples 1 to 3 were weakly alkaline and had low transmittance in the initial stage after spraying, proving that the drug solution still maintained a complete micron-sized emulsion morphology at this time. When the droplets left the nozzle and spread on the collection surface, the specific surface area increased sharply. The pH value of Examples 1 to 3 dropped rapidly from weakly alkaline to near neutral in the first 10 seconds and fell to the slightly acidic range at 30 seconds. During this time window of rapid pH drop, the transmittance of Examples 1 to 3 showed a significant step increase between 10 and 20 seconds and reached a stable high value close to transparency at 60 seconds. This synchronous change in kinetics confirms that the rapid volatilization of ammonia molecules caused the alkaline environment to be lost. The magnesium ions that were originally weakly masked by ammonia molecules were released in large quantities, causing the anionic double layer in the metastable state to lose the electrostatic repulsion balance. Combined with the mechanical deformation caused by nozzle shearing, this ultimately led to irreversible macroscopic demulsification and oil phase precipitation within tens of seconds.

[0058] The experimental data from the comparative samples corroborated the necessary chain of the aforementioned phase transition mechanism. In Comparative Example 1, anhydrous magnesium sulfate was removed. Although ammonia volatilization and a sudden drop in pH occurred after spraying, the transmittance remained at a low value of about 16% within 60 seconds. This indicates that without the presence of divalent cations compressing the double layer, simple mechanical shearing and pH changes cannot break the colloidal stability and prevent phase separation. Comparative Example 3 used non-volatile sodium hydroxide instead of ammonia. Its pH value remained basically constant throughout the monitoring period, and the corresponding transmittance did not change significantly. This indicates that the stable alkaline environment continuously maintained the ionization degree and complexation state of the surfactant, preventing magnesium ions from playing a flocculation role. Comparative Example 7, as a conventional agricultural organosilicon solution, is itself a transparent homogeneous solution and does not involve the phase transition process of emulsion. In summary, this invention successfully achieved a delayed demulsification response triggered by changes in the microenvironment through the combination of volatile ammonia and magnesium salts.

[0059] Test Example 3: Prepare standard extremely hard water by dissolving anhydrous calcium chloride and magnesium chloride hexahydrate in deionized water to prepare standard extremely hard water with a hardness of 1000 mg / L, wherein the molar ratio of calcium to magnesium ions is 2:1, and adjust the initial pH value to 7.0. Take the concentrated composition samples of the adjuvants from Examples 1 to 3 and Comparative Examples 2 and 6, and add them to a 1000 mL stoppered graduated cylinder containing 500 mL of standard extremely hard water at a mass-volume ratio of 1:500. After capping, invert the graduated cylinder 30 times to ensure that the adjuvants and hard water are fully mixed and uniform to form a simulated barrel-mixed drug solution. Place the graduated cylinder in a 25°C constant temperature water bath and let it stand. Observe the macroscopic state of the liquid surface in the graduated cylinder at 0.5 hours, 2 hours and 24 hours after standing. Use a precision ruler to read the volume of the floating oil layer at the top of the graduated cylinder or the precipitated flocculent material at the bottom. After standing for 24 hours, 20 mL of the middle layer of the drug solution was drawn from the center of the liquid surface in the graduated cylinder using a long pipette. The drawn drug solution was placed in a centrifuge tube and centrifuged at 3000 r / min for 15 minutes using a benchtop centrifuge. After centrifugation, the upper oil phase was carefully aspirated and weighed using a microbalance. The centrifugation separation rate was calculated. The higher the centrifugation separation rate, the worse the physical stability of the emulsion in hard water. Each of the above tests was performed in parallel three times, and the arithmetic mean of the three centrifugation separation rates was taken as the final data.

[0060] Table 3. Results of the tests on each sample in standard extremely hard water after mixing and settling in a bucket and centrifugation.

[0061] According to the data in Table 3, after mixing with 1000 mg / L high-hardness water, Examples 1 to 3 showed extremely small amounts of precipitated oil or sediment after 2 hours of settling. In some cases, there was no macroscopic phase separation at all within 0.5 hours. After a settling period of up to 24 hours, the precipitation volume of the examples remained at a low level of only 1.2 mL to 2.5 mL. Even after high-speed centrifugation to forcefully break down the drug solution extracted from the middle layer of the graduated cylinder, the centrifugation separation rate was only between 4.7% and 8.9%. This series of data indicates that the O / W micron-sized emulsions of Examples 1 to 3... The liquid exhibits excellent physical stability in high-concentration calcium and magnesium ion environments. The ammonia water keeps the overall environment weakly alkaline at pH 8.5 or above, which not only maintains the ionization degree of the anionic surfactant, but more importantly, the ammonia molecules, as weak ligands, form an unstable complex equilibrium with the large amount of calcium and magnesium ions brought in by hard water. This mechanism effectively shields the free divalent cations from further compressing the metastable electric double layer, preventing the emulsion from prematurely precipitating inside the tank or in the spray line, and ensuring that the field application process will not fail due to nozzle blockage or uneven concentration of the liquid.

[0062] In contrast, Comparative Example 2, lacking ammonia for sealing, experienced rapid breakdown of its double layer (already at the critical flocculent value) by calcium and magnesium ions in hard water after the adjuvant was mixed with hard water. After only 0.5 hours of standing, Comparative Example 2 produced 5.4 mL of visible stratification, which increased to 28.6 mL after 24 hours. Its 24-hour centrifugation separation rate of the middle layer reached 76.2%, indicating a catastrophic collapse of the emulsion structure. Most of the oil phase had prematurely precipitated and lost its function as a carrier. Comparative Example 6, employing a conventional process of direct mixing, heating, and shearing of all raw materials without prior molecular-level activation and oil-in-water phase transfer, exhibited the worst performance in hard water, with 41.3 mL of precipitate after 24 hours and a centrifugation separation rate as high as 91.5%. This demonstrates that conventional simple physical mixing cannot maintain the emulsion balance between hydrophobic lipids and water in a strong electrolyte environment. Comparing the data from the examples and comparative examples, the ammonia sealing and specific phase transfer process employed in this invention is a key technical feature for overcoming premature demulsification caused by hard water and ensuring stable drug efficacy.

[0063] Test Example 4: Potted scallion plants with similar growth period, plant height and leaf area and no mechanical damage to the leaf surface were selected as test targets. The natural dust on the leaf surface was gently rinsed with a small amount of deionized water and placed in an indoor environment with an ambient temperature of 25℃ and a relative humidity of 60% for 24 hours to allow them to air dry naturally and restore their physiological state. Take the adjuvant composition samples of Examples 1 to 3 and Comparative Examples 1, 3, 4 and 7 respectively, and mix and dilute each sample with deionized water at a mass ratio of 1:1000. Then add 0.1% water-soluble sodium fluorescein as a quantitative tracer to each dilution and stir with a magnetic stirrer at a speed of 500 r / min for 15 minutes to prepare the test solution. The pesticide was applied using a precision quantitative track spray tower equipped with standard fan-shaped nozzles. The nozzle was set to be 0.5 meters above the canopy of the scallion plant, the nozzle moving speed was 0.4 m / s, the working pressure was constant at 0.3 MPa, and the spray volume was equivalent to 45 L / ha. The potted scallion plant was vertically positioned directly below the track, and each scallion plant was sprayed once at a uniform speed. After the spraying operation is completed, move the plants to a ventilated place and let them stand for 2 hours to allow the liquid on the leaves to dry completely. Randomly cut 5 upright tubular leaves from the upper part of each scallion and use a standard punch with a diameter of 1.5 cm to cut leaf discs on the sun-facing side of each leaf to ensure that the surface area of ​​each test sample is consistent. The collected leaf discs were placed in 50 mL light-proof conical flasks containing 25 mL of eluent. The eluent was prepared by mixing deionized water and chromatographically pure methanol at a volume ratio of 1:1. The conical flasks were fixed in a constant temperature shaker and eluted at 150 r / min at room temperature for 45 minutes in the dark to completely dissolve the sodium fluorescein retained on the leaf surface in the eluent. Take a portion of the eluent and place it in a quartz cuvette. Use a fluorescence spectrophotometer to measure its absorbance at an excitation wavelength of 490 nm and an emission wavelength of 512 nm. Plot a standard curve beforehand using a sodium fluorescein standard solution of known concentration. Calculate the absolute amount of drug adhering per unit leaf area based on the measured absorbance. Perform five parallel tests for each treatment group.

[0064] Table 4. Test results of pesticide adhesion per unit area on upright scallion leaf surface for each sample.

[0065] According to the data in Table 4, the average adhesion amount of the diluted pesticide solution in Examples 1 to 3 on the upright leaves of scallions reached 1.93 mg / cm², respectively. 2 1.99 mg / cm 2 and 1.94 mg / cm 2 After the liquid medicine is mechanically sheared and atomized by a 0.3MPa high-pressure nozzle, its specific surface area increases sharply, and the volatile ammonia molecules inside rapidly escape. The escape of ammonia molecules causes the pH value of the droplet microenvironment to drop sharply, losing its weak complexing and sealing effect on divalent magnesium ions. The free magnesium ions then compress the metastable anion diffusion double layer, triggering salting out and demulsification of the emulsion at the moment of contact with the leaf surface. After demulsification, the industrial paraffin components that were originally wrapped inside the aqueous phase precipitate out in situ. Since the chemical polarity and surface energy of the straight-chain alkanes are very similar to those of the hydrophobic cuticle and wax layer of the scallion epidermis, hydrophobic fusion occurs based on intermolecular van der Waals forces, forming a fixed physical anchoring point at the interface between the droplet and the leaf surface. The adhesion work at this interface is greater than the gravitational component of the droplet sliding down the upright smooth surface, thus achieving efficient retention of the liquid medicine.

[0066] The comparative data reversely verified the various constraints of this mechanism. In Comparative Example 1, due to the lack of anhydrous magnesium sulfate, and in Comparative Example 3, due to the use of non-volatile sodium hydroxide instead of ammonia, neither solution underwent the pH-induced demulsification phase transition after spraying. The emulsion remained stable, with the aqueous phase directly contacting the hydrophobic waxy layer on the onion leaf surface. The resulting interfacial repulsion caused a large number of droplets to slide off, with an average adhesion amount of only 0.68 mg / cm³. 2 and 0.62 mg / cm 2 Comparative Example 4, where the industrial paraffin component was removed, showed that although demulsification occurred in the solution, the precipitated phase lacked homologues matching the plant wax layer, failing to form physical anchorage, resulting in an adhesion amount dropping to 0.99 mg / cm³.2 Comparative Example 7 used a conventional organosilicon surfactant, whose mechanism of action is limited to greatly reducing surface tension. After the pesticide solution came into contact with the leaf surface, it quickly spread into a continuous water film and gathered into large droplets that rolled off, resulting in the lowest retention rate of only 0.39 mg / cm³. 2 The above comparative data show that relying solely on physical wetting mechanisms that reduce surface tension is insufficient to solve the problem of drug loss from upright hydrophobic targets. The dynamic phase transition and spatial anchoring mechanism constructed in this scheme has a clear technical effect on increasing the deposition rate.

[0067] In Test Example 5, commercially available 20% acetamiprid soluble powder and 25% tebuconazole emulsion were selected as test active ingredients. The adjuvant composition samples of Examples 1 to 3, Comparative Examples 5 and 7 were mixed with acetamiprid at the mass ratio and diluted with water to prepare an insecticidal test solution with an effective ingredient concentration of 30 mg / L. The adjuvant samples of each group were mixed with tebuconazole and diluted with water in the same way to prepare a fungicide test solution with an effective ingredient concentration of 100 mg / L. An equal concentration of active ingredient diluted solution without any adjuvants was set up as a blank control group. Potted scallions with the same growth cycle and plant height were selected. Each plant was artificially inoculated with 50 thrips nymphs of the same developmental stage. The potted plants were isolated and cultured for 24 hours under a breathable nylon mesh cover until the insect population stabilized. The plants were then sprayed using a small quantitative spraying tower at a concentration of 45 L / ha. The treated potted plants were then placed in a greenhouse under natural light. On the 3rd and 7th days after application, the mesh cover was removed and the number of surviving insects on the plants in each treatment group was counted. Combined with the survival data of the blank control group, the target-corrected mortality rate of each treatment group was calculated using the Abbott formula. Each treatment group was set up with 4 replicates. The prepared fungicidal test solution was evenly sprayed onto the leaves of scallion plants using a quantitative spraying tower with the same parameters. The plants were then moved to a greenhouse to air dry naturally for 2 hours. Diseased leaves from naturally occurring scallion plants in the field were collected, washed with sterile water, and centrifuged to prepare a solution with a concentration of 1×10⁻⁶. 5 A suspension of sporangia of *Pseudomonas aeruginosa* (the causal agent of downy mildew in scallions) was inoculated onto the dried leaves of treated plants using a high-pressure spray method. After inoculation, the potted plants were placed in an artificial climate chamber with a temperature of 18°C ​​and a relative humidity of 95% to induce infection under dark conditions for 48 hours. Subsequently, the plants were transferred to normal light and humidity conditions for further cultivation. On days 7 and 14 post-inoculation, the disease severity of each scallion was assessed according to standard disease grading criteria. The disease index and corresponding control efficacy were calculated. Each treatment group was replicated in four parallel groups.

[0068] Table 5. Dynamic determination results of insecticidal and fungicidal efficacy of each sample in the field.

[0069] According to the data in Table 5, after the application of the original pesticide in Examples 1 to 3, the corrected mortality rate of onion thrips reached 89.7% to 92.4% on the 7th day after application, and the control effect of onion downy mildew reached 88.9% to 90.5% on the 14th day after inoculation. After the pesticide solution undergoes phase transition and demulsification upon contact with the surface of the biological target, the precipitated animal fat component contains a large amount of triglycerides. The carbon chain structure of the triglyceride molecule has a physicochemical affinity with the lipid layer of the insect epidermis and the spore layer of the fungus. The animal fat acts as a carrier medium, generating a lipid-lipid partitioning and penetration effect at the biological target interface. It carries the active molecules of acetamiprid and tebuconazole dissolved in the oil phase across the hydrophobic physiological barrier and enters the internal tissue of the target to accumulate to a lethal concentration. The lipid phase conduction process increases the transmembrane absorption of the pesticide active ingredients. The mortality rate and control efficacy test values ​​show a stable upward trend over time.

[0070] Comparative Example 5 removed animal fat components during the formulation preparation stage. The pesticide solution relied on industrial paraffin to form a physical anchor and trap on the surface of onion leaves, but it lacked a lipid carrier medium to penetrate the hydrophobic barrier of fungi and insects. The active ingredients of the pesticide accumulated on the outside of the pathogen spores or on the surface of the insects, making it difficult to conduct and penetrate to the target site. The pesticide molecules exposed to the outside of the target underwent photolysis and environmental degradation over time. Test data showed that the corrected mortality rate of onion thrips decreased to 54.8% on day 7, and the control effect of downy mildew decreased to 49.2% on day 14. Comparative Example 7 used agricultural organosilicon surfactants. The pesticide solution spread excessively and flowed due to gravity on the upright leaves of onions, resulting in insufficient initial trapping of pesticide. The organosilicon component does not have a lipid phase distribution and directional conduction mechanism. All control efficacy test indicators were at a low level. Field biological control efficacy test data confirmed the material conduction role of animal fat components in the process of breaking through the physiological barrier of the target.

[0071] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables, characterized in that, It is made from the following components in parts by weight: 20-40 parts of base deionized water; 12.5-30 parts of target plant wax layer oil phase precursor A; 5-15 parts of industrial paraffin; 4.5-14.3 parts of fatty alcohol polyoxyethylene ether; 3-5.7 parts of sodium dodecylbenzene sulfonate; 15-25 parts of target insect surface lipid layer oil phase precursor B; 5-15 parts of animal fat; 7.14-15.56 parts of egg yolk lecithin; 2.86-4.44 parts of sodium dodecylbenzene sulfonate; 2.5-6 parts of anhydrous magnesium sulfate; 16-28.5 parts of deionized water as a solvent for dissolving anhydrous magnesium sulfate; and 1.5-3 parts of ammonia.

2. The pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables according to claim 1, characterized in that, The targeted plant waxy layer oil phase precursor A is used to release straight-chain alkane components after salting out and demulsification.

3. The pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables according to claim 1, characterized in that, The target insect surface lipid layer oil phase precursor B is used to release animal fat components rich in triglycerides after salting out and demulsification.

4. The pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables according to claim 1, characterized in that, The industrial paraffin has a carbon chain length between C20 and C35 and a melting point range of 50°C to 65°C; the egg yolk lecithin has a phosphatidylcholine purity of not less than 60%.

5. A pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables according to any one of claims 1, characterized in that, The pesticide adjuvant composition is a milky white metastable solid lipid dispersion with an overall zeta potential stable between -25mV and -35mV.

6. A method for preparing a pesticide adjuvant composition for improving the fungicidal and insecticidal efficiency of vegetables, as described in any one of claims 1-5, characterized in that, Includes the following steps: S1 heats the base deionized water and, under high-speed shearing, injects the hot-melted target plant wax layer oil phase precursor A and the target insect surface lipid layer oil phase precursor B into the base deionized water at a uniform speed to form a micron-sized emulsion. S2 rapidly cools down micron-sized emulsions, causing the lipid precursors in the dispersed phase to cool and solidify. Switch to low-speed stirring and slowly add anhydrous magnesium sulfate aqueous solution, while monitoring and controlling the Zeta potential to the critical flocculation value in real time; S3 maintains low-speed stirring, slowly adds 25% ammonia water dropwise, adjusts the pH value to weakly alkaline, and then discharges the product.

7. The method for preparing a pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables according to claim 6, characterized in that, In S1, the heating temperature of the basic deionized water is constant at 60-65℃, the speed of the high-shear disperser is set at 3000-5000 r / min, and the high-shear maintenance time is 15-30 minutes; in S2, the cooling rate is controlled at 2-5℃ / min, and the target cooling temperature is 25-35℃; the dropping time of the anhydrous magnesium sulfate aqueous solution is controlled to be uniformly added within 15-20 minutes, and after the total amount is added, the Zeta potential is between -25mV and -35mV.

8. A method for preparing a pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables according to claim 6, characterized in that, When using, the pesticide adjuvant composition, pesticide technical and dilution water are added to the tank of the application device for mixing in proportion. Then, the mixed solution is sprayed onto the surface of onion vegetables under a system pressure of 0.2-0.5 MPa.

9. A method for preparing a pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables according to claim 8, characterized in that, The mixed solution is prepared by mixing the pesticide adjuvant composition with the pesticide technical and dilution water at a mass ratio of 1:500 to 1:1000.

10. A method for preparing a pesticide adjuvant composition for improving the bactericidal and insecticidal efficiency of vegetables according to claim 8, characterized in that, The pesticide technicals are acetamiprid technical with a purity of not less than 97% and tebuconazole technical with a purity of not less than 97%.

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