Aerial application adjuvant and preparation method and application thereof

Abstract

The application provides a novel aerial spraying aid and a preparation method and application thereof, and relates to the field of agricultural aerial spraying technology.The aerial spraying aid is a self-emulsifying Pickering emulsion, which is composed of the following components in mass percentage: 65-92% of an oil phase matrix, 5-20% of solid particles and 3-15% of an emulsifying auxiliary agent, wherein the solid particles are micron-sized solid particles.The preparation method comprises the following steps: pre-mixing the solid particles and the emulsifying auxiliary agent; adding the pre-mix into the oil phase matrix and performing high-speed shearing dispersion; performing high-pressure homogenization treatment on the dispersion system; and obtaining the aerial spraying aid after aging treatment of the homogenized mixture.The aerial spraying aid is applied in agricultural aerial spraying.The aerial spraying aid is prepared by compounding the oil phase matrix, the solid particles and the emulsifying auxiliary agent, the solid particles are stably dispersed in the oil phase under the action of the emulsifying auxiliary agent, and the aerial spraying aid can spontaneously form a stable Pickering emulsion when diluted with water, so that the purposes of low cost, excellent performance and convenient use are achieved.

Description

Technical Field

[0001] This invention relates to the field of agricultural aerial spraying technology, and in particular to a novel aerial spraying adjuvant, its preparation method, and its application. Background Technology

[0002] With the popularization of drone-based aerial spraying technology, aerial spraying adjuvants are playing an increasingly important role in improving pesticide utilization and reducing drift and evaporation losses. Traditional aerial spraying adjuvants mostly rely on surfactant compound systems, which have the following main problems: complex use, requiring addition in a specific order and thorough stirring; poor stability of the formed emulsion, prone to stratification; limited anti-drift and anti-evaporation performance; and sensitivity to water quality, resulting in unstable performance.

[0003] Pickering emulsions have attracted attention in the pesticide field due to their excellent stability. However, existing technologies mostly use nanoparticles (such as nano-silica) as stabilizers, which have problems such as high cost, potential environmental risks, and the need for complex equipment for on-site preparation. Summary of the Invention

[0004] This invention provides a novel aerial spraying adjuvant, its preparation method, and its application. It is formulated by compounding an oil phase matrix, solid particles, and an emulsifying agent. Under the action of the emulsifying agent, the solid particles are stably dispersed in the oil phase and can spontaneously form a stable Pickering emulsion when diluted with water. As an aerial spraying adjuvant, it achieves the goals of low cost, high performance, and convenient use.

[0005] In a first aspect, the present invention provides a novel aerial spraying adjuvant, which adopts the following technical solution: A novel aerial spraying adjuvant is a self-emulsifying Pickering emulsion, composed of the following components by mass percentage: 65%~92% oil phase matrix, 5%~20% solid particles, and 3%~15% emulsifying aid. The solid particles are micron-sized solid particles with a particle size of 1~50μm. The solid particles are one or more mixtures of modified biomass particles, modified mineral particles, and organic polymer microspheres. The oil phase matrix is ​​one or more mixtures of rapeseed oil methyl ester, soybean oil methyl ester, and methyl oleate. The emulsifying aid is one or more mixtures of polyglycerol fatty acid ester, sorbitan trioleate, polyisobutylene succinimide, and oil-soluble polyether modified polymer.

[0006] The core of this invention lies in abandoning conventional nanoparticles and using low-cost, readily available micron-sized solid particles. Through a carefully designed emulsification assist system, these particles are stably dispersed in the oil phase and can spontaneously and rapidly form a stable Pickering emulsion when diluted with water, thereby significantly improving the anti-drift, anti-evaporation, and anti-deposition performance of the aerial spraying solution.

[0007] During the Pickering emulsion preparation stage, the emulsifying aid adsorbs onto the surface of solid particles, altering their surface energy and enabling them to remain stably suspended in the oil phase. When diluted with water, the emulsifying aid partially desorbs or migrates from the surface of the solid particles, preferentially adsorbing onto the newly formed oil-water interface, reducing interfacial tension and guiding the solid particles to oriented towards the interface. Simultaneously, the emulsifying aid and solid particles form a "particle-molecule" composite armor layer at the interface, which has a higher strength than a single component.

[0008] Optionally, the modified biomass pellets are hydrophobically treated straw powder, lignocellulose microcrystals, or chitin microfibers.

[0009] Optionally, the modified mineral particles are organobentonite, stearic acid-modified calcium carbonate, or siliceous magnesium clay.

[0010] Optionally, the organic polymer microspheres are polylactic acid microspheres or polycaprolactone microspheres.

[0011] Secondly, the present invention provides a method for preparing a novel aerial spraying adjuvant, comprising the following steps: Step S1: Premix the solid particles with the emulsifying aid to obtain a premix; Step S2: The premixed mixture is added to 3 / 4 of the mass of the oil phase matrix and dispersed by high-speed shearing to obtain a dispersion system; Step S3: Add the remaining 1 / 4 mass of the oil phase matrix to the dispersion system and perform high-pressure homogenization to obtain a homogeneous mixture; Step S4: The homogeneous mixture is subjected to aging treatment to obtain the novel aerial spraying adjuvant.

[0012] Optionally, step S1 specifically involves: premixing the solid particles and the emulsifying agent in a dry state for 10-30 minutes in a certain proportion, so that the emulsifying agent initially adheres to the surface of the solid particles to obtain a premix.

[0013] Optionally, step S2 specifically involves: slowly adding the premix to a portion of the oil phase matrix, and dispersing it at 40-60°C with high-speed shearing at 5000-10000 rpm for 15-30 minutes to obtain a dispersion system.

[0014] Optionally, step S3 specifically involves: adding the remaining oil phase matrix to the dispersion system, transferring it to a high-pressure homogenizer, and homogenizing it 2-4 times under a pressure of 30-60 MPa to obtain a homogenized mixture.

[0015] Optionally, step S4 specifically involves: maturing the homogeneous mixture at 45-55°C for 24-48 hours to obtain a uniform and stable self-emulsifying Pickering emulsion, which is the novel aerial spraying adjuvant.

[0016] Thirdly, the present invention provides the application of a novel aerial spraying adjuvant in agricultural aerial spraying. The novel aerial spraying adjuvant is added to water at a volume ratio of 1:50 to 500, stirred evenly, and then added to pesticides for aerial spraying operations.

[0017] The novel aerial spraying adjuvant provided by this invention is an oily liquid that does not require on-site high-speed shearing; simply adding water and shaking forms a Pickering emulsion with uniform particle size and excellent stability. This system significantly reduces drift rate and evaporation loss, is resistant to rain washout, is suitable for various water quality conditions, and is environmentally friendly and cost-effective, solving the key bottlenecks of complex operation, high cost, and poor safety in existing technologies.

[0018] In summary, the present invention has at least one of the following beneficial effects: 1. The aerial spraying adjuvant provided by this invention can achieve emulsification upon addition of water. Through the interface guidance mechanism of the emulsification adjuvant, a stable emulsion with uniform particle size can be formed within 120 seconds with only gentle stirring. Users do not need complicated operations and expensive equipment, which greatly reduces the threshold for use.

[0019] 2. The aerial spraying adjuvant provided by this invention is a Pickering emulsion, which can quickly self-emulsify to form a Pickering emulsion after being diluted with water, increasing the droplet size and reducing the proportion of fine droplets, thereby significantly reducing the drift rate and improving the resistance to evaporation, deposition adhesion and pesticide utilization. Compared with traditional adjuvants, it can reduce the amount of pesticide used by 10%-30%, and is particularly suitable for drone aerial spraying operations.

[0020] 3. The method for preparing the aerial spraying adjuvant provided by this invention is simple, low-cost, and convenient to use; it can spontaneously emulsify upon the addition of water. Detailed Implementation

[0021] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention. Example 1:

[0022] Example 1 provides an aerial spraying adjuvant, which is composed of the following components by mass percentage: 80% oil phase matrix, 12% solid particles and 8% emulsifying agent, wherein the oil phase matrix is ​​methyl oleate, the solid particles are polylactic acid microspheres with a particle size of 1~10μm, and the emulsifying agent is polyglycerol-6-dioleate.

[0023] The specific preparation method of this aerial spraying adjuvant is as follows: Step S1: Premix polylactic acid microspheres with polyglycerol-6-dioleate in a dry state for 15 minutes to obtain a premix; Step S2: Slowly add the premix to 3 / 4 of the mass of methyl oleate, and shear disperse at 50℃ and 8000 rpm for 20 minutes to obtain the dispersion system; Step S3: Add the remaining 1 / 4 mass of methyl oleate to the dispersion system, transfer it to a high-pressure homogenizer, and homogenize it three times under a pressure of 50 MPa to obtain a homogenized mixture; Step S4: The homogenized mixture is aged at 50°C for 36 hours to obtain Pickering emulsion A. Example 2:

[0024] Example 2 provides an aerial spraying adjuvant, which is composed of the following components by mass percentage: 84% oil phase matrix, 10% solid particles and 6% emulsifying agent, wherein the oil phase matrix is ​​soybean oil methyl ester, the solid particles are stearic acid modified microcrystalline cellulose with a particle size of 1~20μm, and the emulsifying agent is polyisobutylene succinimide (T151).

[0025] The specific preparation method of this aerial spraying adjuvant is as follows: Step S1: Stearic acid-modified microcrystalline cellulose and polyisobutylene succinimide are premixed in a dry state for 15 minutes to obtain a premix. Step S2: Slowly add the premix to 3 / 4 of the mass of soybean oil methyl ester, and shear disperse at 50℃ and 8000 rpm for 20 minutes to obtain the dispersion system; Step S3: Add the remaining 1 / 4 mass of soybean oil methyl ester to the dispersion system, transfer it to a high-pressure homogenizer, and homogenize it three times under a pressure of 50 MPa to obtain a homogenized mixture; Step S4: The homogenized mixture is aged at 50°C for 36 hours to obtain Pickering emulsion B. Example 3:

[0026] Example 3 provides an aerial spraying adjuvant, which is composed of the following components by mass percentage: 80% oil phase matrix, 15% solid particles and 5% emulsifying agent, wherein the oil phase matrix is ​​rapeseed oil methyl ester, the solid particles are organic modified bentonite with a particle size of 1~5μm, and the emulsifying agent is polyether modified polysiloxane (BYK-3455).

[0027] The specific preparation method of this aerial spraying adjuvant is as follows: Step S1: Premix the organic modified bentonite and the polyether modified polysiloxane in a dry state for 15 minutes to obtain a premix; Step S2: Slowly add the premix to 3 / 4 of the mass of rapeseed oil methyl ester, and shear disperse at 50℃ and 8000 rpm for 20 minutes to obtain the dispersion system; Step S3: Add the remaining 1 / 4 mass of rapeseed oil methyl ester to the dispersion system, transfer it to a high-pressure homogenizer, and homogenize it three times under a pressure of 50 MPa to obtain a homogenized mixture; Step S4: The homogenized mixture is aged at 50°C for 36 hours to obtain Pickering emulsion C. Example 4:

[0028] Example 4 provides an aerial spraying adjuvant, which is composed of the following components by mass percentage: 65% oil phase matrix, 20% solid particles and 15% emulsifying agent, wherein the oil phase matrix is ​​methyl oleate, the solid particles are hydrophobically treated straw powder with a particle size of 20~50μm, and the emulsifying agent is sorbitan trioleate (Span 85).

[0029] The specific preparation method of this aerial spraying adjuvant is as follows: Step S1: Premix the hydrophobically treated straw powder with sorbitan trioleate in a dry state for 15 minutes to obtain a premix; Step S2: Slowly add the premix to 3 / 4 of the mass of methyl oleate, and shear disperse at 50℃ and 8000 rpm for 20 minutes to obtain the dispersion system; Step S3: Add the remaining 1 / 4 mass of methyl oleate to the dispersion system, transfer it to a high-pressure homogenizer, and homogenize it three times under a pressure of 50 MPa to obtain a homogenized mixture; Step S4: The homogenized mixture is aged at 50°C for 36 hours to obtain Pickering emulsion D. Example 5:

[0030] Example 5 provides an aerial spraying adjuvant, which is composed of the following components by mass percentage: 92% oil phase matrix, 5% solid particles and 3% emulsifying agent, wherein the oil phase matrix is ​​rapeseed oil methyl ester, the solid particles are polycaprolactone microspheres with a particle size of 10~20μm, and the emulsifying agent is sorbitan trioleate (Span 85).

[0031] The specific preparation method of this aerial spraying adjuvant is as follows: Step S1: Premix polycaprolactone microspheres with sorbitan trioleate in a dry state for 15 minutes to obtain a premix; Step S2: Slowly add the premix to 3 / 4 of the mass of rapeseed oil methyl ester, and shear disperse at 50℃ and 8000 rpm for 20 minutes to obtain the dispersion system; Step S3: Add the remaining 1 / 4 mass of rapeseed oil methyl ester to the dispersion system, transfer it to a high-pressure homogenizer, and homogenize it three times under a pressure of 50 MPa to obtain a homogenized mixture; Step S4: The homogenized mixture is aged at 50°C for 36 hours to obtain Pickering emulsion E.

[0032] The Pickering emulsions A-E prepared in the above examples, along with commercially available silicone additives and commercially available vegetable oil additives, were used for the following performance tests.

[0033] Performance Test Item 1: Self-emulsification Time Test The self-emulsification time test is used to evaluate the time required for a self-emulsifying Pickering emulsion of aerial spraying adjuvants to spontaneously form a stable emulsion after the addition of water, reflecting its ease of use. The test principle is to determine the shortest time required from the start of stirring after adding water to the formation of a uniform and stable Pickering emulsion through visual observation.

[0034] The test was conducted at a dilution ratio of 1:100. The test water was standard hard water (342 ppm, calculated as CaCO3), and the specific steps are as follows: 1) Weigh 10.00g of the self-emulsifying Pickering emulsion sample to be tested; measure 990mL of standard hard water into a 1000mL beaker.

[0035] 2) Place the beaker on a magnetic stirrer, add the stir bar, and set the stirring speed to 300 rpm. Start the stirrer, and once the water flow forms a stable vortex, quickly add the weighed Pickering emulsion sample to the center of the beaker all at once, while simultaneously starting the timer.

[0036] 3) The liquid surface changes were observed visually. Initially, the sample was dispersed in oil droplets, gradually turning into a milky white, uniform emulsion as emulsification progressed. Emulsification was considered complete when there was no obvious oil film or droplets on the surface, the liquid was uniformly milky white, and no oil phase adhered to the beaker wall. The time required for self-emulsification was recorded. Each Pickering emulsion sample was tested three times using this method, and the average of the three self-emulsification times was taken as the self-emulsification time for that sample. The results are shown in Table 1.

[0037] Performance Test Item 2: Stability Test of Diluted Emulsion The dilution emulsion stability test is used to evaluate the physical stability of the emulsion formed by diluting the self-emulsifying Pickering emulsion of the aerial spraying adjuvant with water over a certain period of time, and to determine whether it will undergo stratification, precipitation, or demulsification during actual aerial spraying operations. The specific procedure is as follows: Pickering emulsions A-E, along with commercially available silicone and vegetable oil additives, were diluted 100-fold and transferred to 100mL stoppered graduated cylinders, taking care to avoid air bubbles. If bubbles were present, the cylinders could be gently tapped or allowed to stand for a moment to dissipate. The graduated cylinders were placed vertically in a 25°C constant-temperature water bath, ensuring the liquid level was flush with the water surface, avoiding vibration and disturbance. After 4 hours, the stability of the diluted emulsions under gravity was evaluated, including phenomena such as stratification, sedimentation, flocculation, and aggregation. The results are shown in Table 1.

[0038] Performance Test Item 3: Droplet Drift Rate Test The droplet drift rate test is used to evaluate the ability of aerial spraying adjuvants to reduce droplet drift under simulated aerial spraying conditions, and to quantify the proportion of droplets that drift outside the target area during spraying. The test principle is as follows: A wind tunnel is used to simulate the aerial spraying environment, collecting droplet deposition in both the target and non-target areas, and calculating the proportion of droplets drifting outside the target area out of the total droplets. The test utilizes the wind tunnel device of Jiangsu Qingyu Chemical's "Comprehensive Evaluation Laboratory for Pesticide Spatial Transport" to simulate the downdraft wind field and lateral environmental wind field of the drone. This device features adjustable spray pressure, replaceable nozzle models, and online real-time monitoring by multiple connected spray laser particle size analyzers. The specific test process is as follows: 1) Sample preparation and labeling: Pickering emulsions A to E, as well as commercially available organosilicon additives and commercially available vegetable oil additives, were diluted 100 times to prepare test samples. At the same time, control samples without additives (only sodium fluorescein aqueous solution) were prepared. All samples were numbered to avoid confusion.

[0039] 2) Wind tunnel setup: The lateral wind speed in the wind tunnel was set to 3.0±0.2 m / s (simulating light wind conditions in the field), the vertical downdraft wind speed was set to 13.0±2 m / s, the spray chamber temperature was controlled at 25±2℃, the relative humidity was 50±5%, the vertical height of the nozzle from the detection laser beam was 2.0±0.1 m (simulating the flight spraying height), and within a downwind range of 0~5 m from the nozzle, a spray laser particle size analyzer was activated every 1 meter. The control computer of the spray laser particle size analyzer was turned on and the detection software was started and put into standby mode.

[0040] 3) Spraying operation: The spray tank pressure was set to 0.3 MPa (simulating the spray pressure of aerial spraying), a standard fan-shaped nozzle (110°) was selected, the spraying time was 10 ± 1 seconds, and the spray volume was 500 ± 5 mL. The spray system was cleaned after each test to avoid cross-contamination.

[0041] 4) Testing software operation: The software self-test was initiated, the online spray laser particle size analyzer automatically aligned, background noise was eliminated, and the detection program started 1 second after spraying began. Before the spraying ended, the test was terminated by clicking "End Test." The system automatically generated the average droplet size value for each detector across multiple rounds of testing, and the software automatically calculated the droplet drift rate. The results are shown in Table 1.

[0042] For the validity of test data, the RSD between parallel samples should be <15%, the recovery rate should be 85%-115%, and the drift rate of the control sample should be within a reasonable range (30%-45%).

[0043] Performance Test Item 4: Surface Tension Test and Contact Angle Test Pickering emulsions A-E, along with commercially available organosilicon adjuvants and commercially available vegetable oil adjuvants, were diluted 100-fold to prepare test samples. A control sample (containing only sodium fluorescein aqueous solution) without adjuvants was also prepared. Surface tension and contact angle tests were performed on the aforementioned samples using the hanging drop method to measure the spreading ability of the pesticide solution on the leaf surface. Surface tension tests were conducted using the hanging drop method at 25°C, and contact angle tests were performed on rice leaf surfaces. The results are shown in Table 1.

[0044] Performance Test Item 5: Evaporation Resistance Test

[0045] Pickering emulsions A-E, as well as commercially available silicone and vegetable oil additives, were diluted 100-fold to prepare test samples. A control sample (containing only sodium fluorescein aqueous solution) without additives was also prepared. Evaporation resistance tests were then conducted. The evaporation rate of each dilution was tested using an artificial climate chamber at a constant temperature of 18°C ​​and a constant humidity of 30%. The results are shown in Table 1.

[0046] Performance Test Item Six: Leaf Deposition Test

[0047] Pickering emulsions A-E, commercially available silicone adjuvants, and commercially available vegetable oil adjuvants were diluted 100-fold to prepare test samples. Simultaneously, control samples (containing only sodium fluorescein aqueous solution) without adjuvants were prepared, and leaf deposition amounts were tested for both. The specific procedures are as follows: Natural wind was simulated indoors using an electric fan. The fan power was adjusted to maintain a wind speed of 4 m / s. The water-sensitive paper was placed on the ground 0.5 m in front of the fan. The sample was sprayed using a backpack electric sprayer 1.5 m above the water-sensitive paper. The nozzle and fan were at the same height, the fan direction was horizontal to the ground, and the spray direction was perpendicular to the ground. After spraying, the water-sensitive paper was collected and allowed to air dry naturally. The droplet parameters of the photographs were analyzed using Depositscan software. The results are shown in Table 1.

[0048] Performance Test Item 7: Rainwater Erosion Resistance Test Pickering emulsions A to E, commercially available silicone additives, and commercially available vegetable oil additives were each prepared into 10× dilutions, and the fluorescent solution was diluted 200×. The solutions were then mixed together to form the test solution. A microsyringe was used to drop approximately 2 μL of the drug solution onto a glass slide (a standard 7.5 × 2.5 cm microscope slide). The slide was then dried in a 30°C incubator for 30 min to prepare the test slide. The slide was fixed on a 45° tiltable support and placed directly below a glass burette, 2 cm from the burette opening. 50 ml of distilled water was added to the burette, and the burette was turned on and titrated at a rate of 3 drops / second, with a total titration volume of 10 mL of distilled water. A beaker was placed below the slide to collect the eluted fluorescent drug solution. The absorbance of the eluent at 382 nm was measured using a spectrophotometer. A linear equation (y = b + ax) was plotted, and a standard curve was obtained (given the dye concentration and its corresponding absorbance). The residual dye content in the eluent was calculated based on the mg dye concentration in the eluent. The results are shown in Table 1.

[0049] The resistance of pesticides to rain washout is characterized by the amount of pesticide solution retained on the target, and is calculated using formula (1).

[0050] Vi=(Cf×Vf) / Ci×1000 (1) Where Vi is the amount of drug solution retained on the target, in μL; Cf is the dye concentration (mg / L) detected by a spectrophotometer obtained from the linear equation; Vf is the amount of water used to rinse the sample; and Ci is the concentration of fluorescent whitening agent dye in the spray solution.

[0051] Table 1 Performance Test Results

[0052] As can be seen from the results in Table 1, the Pickering emulsions A to E provided in Examples 1-5 of the present invention have good storage stability and a storage life of more than 2 years. The Pickering emulsions A to E can be diluted with water within 120 seconds to form a stable emulsion with uniform particle size, and the diluted emulsion can remain stable for at least 4 hours without stratification, thus ensuring the uniformity of spraying. Moreover, aerial spraying operations usually last for 2-4 hours, so maintaining stability without stratification for 4 hours can cover most operational scenarios.

[0053] Compared with commercially available silicone and vegetable oil adjuvants, Pickering emulsions A-E, after being diluted with water, have a 40%-60% lower droplet drift rate and a 50%-100% longer evaporation time. Moreover, the particles have an anchoring effect on the leaf surface, increasing the resistance to rain washout by 30%-50%. Therefore, they can greatly promote pesticide absorption and reduce pesticide use by 10%-30%.

[0054] Field efficacy test 1: Aerial spraying experiment on rice Experiment location: Rice planting base in Changsha City, Hunan Province; Experiment time: July 2023; Rice variety: Nanjing 9108; Target pest: Rice leaf roller; Application equipment: DJI T30 agricultural drone, flight altitude 2m, flight speed 4m / s, spray volume 1L per mu.

[0055] The experimental design is shown in Table 2. Treatment group 1 used Pickering emulsion A prepared in Example 1 of this invention as an adjuvant, treatment group 2 used a commercially available organosilicon adjuvant, and treatment group 3 did not add any adjuvant. Treatment groups 1-3 were treated with 20% chlorantraniliprole SC pesticide. The experimental results are shown in Table 3.

[0056] Table 2. Rice Aerial Spraying Experiment Program

[0057] Table 3 Results of rice aerial spraying experiment

[0058] As can be seen from Table 3, the treatment group 1 using the adjuvant of the present invention is significantly better than other treatment groups in terms of prevention efficacy, anti-drift, and leaf deposition. The prevention efficacy is increased by 10-15%, the drift rate is reduced by more than 50%, and the yield is increased by more than 5%.

[0059] Field efficacy test 2: Wheat aerial spraying trial Experiment location: Wheat planting base in Zhengzhou City, Henan Province; Test period: April 2023; Target disease for prevention and control: Wheat powdery mildew; Application equipment: XAG P80 agricultural drone, flight altitude 2.5m, flight speed 5m / s, spray volume 1.2L per mu.

[0060] The experimental design is shown in Table 4. Treatment group 4 used Pickering emulsion B prepared in Example 1 of this invention as an adjuvant, treatment group 5 used commercially available vegetable oil adjuvant, and treatment group 6 did not add any adjuvant. Treatment groups 4-6 were treated with 25% pyraclostrobin SC pesticide. The experimental results are shown in Table 5.

[0061] Table 4 Wheat Aerial Spraying Trial Plan

[0062] Table 5 Results of wheat aerial spraying experiment

[0063] As can be seen from Table 5, the treatment group 4 using the adjuvant of the present invention is significantly better than other treatment groups in terms of prevention efficacy and deposition on the back of the leaves, especially the deposition on the back of the leaves is increased by more than 60%.

[0064] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing an aerial spraying adjuvant, characterized in that, Includes the following steps: Step S1: Premix the solid particles with the emulsifying aid to obtain a premix; Step S2: The premixed mixture is added to 3 / 4 of the mass of the oil phase matrix and dispersed by high-speed shearing to obtain a dispersion system; Step S3: Add the remaining 1 / 4 mass of the oil phase matrix to the dispersion system and perform high-pressure homogenization to obtain a homogeneous mixture; Step S4: The homogeneous mixture is subjected to aging treatment to obtain the aerial spraying additive; The aerial spraying adjuvant is composed of the following components by mass percentage: 65%~92% oil phase matrix, 5%~20% solid particles, and 3%~15% emulsifying agent. The solid particles are micron-sized solid particles with a particle size of 1~50μm. The solid particles are one or more of modified biomass particles, modified mineral particles, and organic polymer microspheres. The oil phase matrix is ​​one or more of rapeseed oil methyl ester, soybean oil methyl ester, and methyl oleate. The emulsifying agent is one or more of polyglycerol fatty acid ester, sorbitan trioleate, polyisobutylene succinimide, and oil-soluble polyether modified polymer. The modified biomass particles are hydrophobically treated straw powder, lignocellulose microcrystals, or chitin microfibers. The modified mineral particles are organobentonite, stearic acid-modified calcium carbonate, or siliceous magnesium clay. The organic polymer microspheres are polylactic acid microspheres or polycaprolactone microspheres; The aerial spraying adjuvant can spontaneously and rapidly form a stable Pickering emulsion when diluted with water.

2. An aerial spraying adjuvant prepared by the method described in claim 1.

3. The application of the aerial spraying adjuvant as described in claim 2 in agricultural aerial spraying, characterized in that, Add the aerial spraying adjuvant to water at a volume ratio of 1:50~500, stir evenly, and then add pesticide for aerial spraying.

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