Special auxiliary agent suitable for flight control mixing, preparation method and application thereof

Abstract

The invention discloses a special auxiliary agent suitable for flight control mixing, a preparation method and application thereof. The special auxiliary agent suitable for flight control mixing comprises the following components in percentage by weight: 30-40% of plant essential oil, 10-20% of a dispersing agent, 10-15% of a wetting agent, 5-10% of a penetrating agent, 2-4% of an anti-freezing agent, 5-10% of a modified anti-drifting agent and 15-25% of water. Compared with the prior art, the special auxiliary agent prepared by the invention has the advantages that the particle size of fog drops can be increased within a certain range, fog drop sedimentation is promoted, and spray drift is slowed down; and the composition has good wettability and stability, improves the versatility of being matched with pesticides, prevents the liquid medicine from being sticky, thick and flocculated, and is suitable for corn lodging resistance, rice and wheat flying prevention.

Description

Technical Field

[0001] The invention relates to the technical field of pesticide adjuvants, and in particular to a special adjuvant suitable for aerial spraying mixing, a preparation method and application thereof. Background Art

[0002] There is a large market demand for corn lodging resistance and yield increase. The current mainstream is promoted in the form of packages, which usually contain foliar fertilizers, regulators, mainly 30% aminoethyl ethylene, and a broad-spectrum fungicide, mainly pyraclostrobin single agent or compound, such as fluopicolide, tebuconazole, etc.; land is rapidly transferred, and the scale of planting is getting larger and larger. Aerial spraying has become the first choice for large farmers because of its high efficiency and labor saving. However, the specific scenario of high concentration and low water volume leads to easy paste and flocculation when dispensing. How to solve this pain point has become a breakthrough point for seizing the corn lodging resistance and yield increase market. At present, the existing corn aerial spraying technology mainly has the disadvantages of strong acidity of aerial spraying drugs, poor compatibility of preparations, and easy flocculation at low water volume. Among them, the existing aerial spraying adjuvants used in rice and wheat still have the problem of sticky and thick liquid and inability to fly spray, so it is very important to develop an aerial spraying adjuvant with good wettability and anti-drift effect.

[0003] Invention patent CN108935459A discloses a modified vegetable oil flying control adjuvant and its preparation method and application, which belongs to the field of plant protection technology. In terms of weight, the raw materials of the modified vegetable oil flying control adjuvant include 42 to 56 parts by weight of modified rosin oil, 14 to 20 parts by weight of surfactant, 10 to 20 parts by weight of wetting and spreading agent, and 10 to 20 parts by weight of anti-drift agent. The modified vegetable oil flying control adjuvant has a low cost, can effectively improve the performance of the liquid medicine and the droplet performance, and improve the prevention and control effect. Its preparation method includes: dissolving the wetting and spreading agent and the anti-drift agent in the modified rosin oil, and then mixing with the surfactant. The method is simple and easy to operate, which is conducive to the large-scale production of the modified vegetable oil flying control adjuvant. The modified vegetable oil flying control adjuvant is used to mix with the liquid medicine to prevent and control crop diseases through drones, which can effectively improve the droplet performance of the liquid medicine and enhance the field flying control effect. However, the modified vegetable oil anti-drifting agent prepared by the invention still has weak wettability and insufficient anti-drifting effect. Summary of the invention

[0004] In view of the shortcomings of poor wettability and insufficient anti-drift effect of flying prevention auxiliary agents in the prior art, the technical problem to be solved by the present invention is to provide a special auxiliary agent suitable for flying prevention mixing with high wettability, strong adhesion and good anti-drift effect, a preparation method and application thereof.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: The special auxiliary agent for flying control mixing of the present invention comprises the following components in weight percentage: 30-40% of plant essential oil, 10-20% of dispersant, 10-15% of wetting agent, 5-10% of penetrant, 2-4% of antifreeze agent, 5-10% of modified anti-drift agent and 15-25% of water.

[0006] Preferably, the plant essential oil is at least one of black pepper essential oil, orange peel essential oil, red pepper essential oil, green pepper essential oil, tea tree essential oil, garlic essential oil, clove bud essential oil, clove leaf essential oil and cinnamon essential oil.

[0007] Preferably, the dispersant is at least one of sodium polyacrylate, polypropylene alcohol, fatty alcohol polyoxypropylene polyoxyethylene ether, lignin sulfonate, and polycarboxylate.

[0008] Preferably, the wetting agent is at least one of sodium fatty alcohol polyoxyethylene ether carboxylate, sodium fatty alcohol polyoxyethylene ether sulfate, sodium butylnaphthalene sulfonate, sodium secondary alkyl sulfonate, sodium hexadecylbenzene sulfonate, sodium n-hexadecyl sulfate, fatty amine polyoxyethylene ether, and sodium dioctyl sulfosuccinate.

[0009] Preferably, the penetrant is at least one of dioctyl sodium succinate sulfonate, silicone polyoxyethylene ether, fatty alcohol, succinate, alcohol ether succinate, phenol ether succinate, alcohol ether phosphate, isosorbide and urea.

[0010] Preferably, the antifreeze agent is at least one of ethylene glycol, glycerol and polyethylene glycol.

[0011] A special auxiliary agent suitable for mixing with flying pests, the preparation method is as follows: Weigh each raw material according to weight percentage, add plant essential oil, dispersant, wetting agent, penetrant, antifreeze agent and modified anti-drift agent into water, stir and mix for 2-5 hours at a stirring speed of 100-500 rpm, and obtain the special auxiliary agent for anti-drift mixing.

[0012] The preparation method of the modified anti-drift agent is as follows, in parts by weight: S1, adding 2-8 parts of 3-8wt% xanthan gum aqueous solution, 1-3 parts of isomeric tridecanol ether potassium salt, 2-5 parts of sodium dodecyl diphenyl ether disulfonate, 1-5 parts of ethylene glycol, and 0.1-0.3 parts of silicone defoamer to 80-90 parts of water, and then adding 50-150 parts of zirconium balls with a diameter of 5-15 mm, grinding at 30-50° C. at a speed of 1000-1500 r / min for 1-3 hours to obtain a drift agent; S2, adding 3-8 parts of styrene and 8-12 parts of methacrylic acid to 15-20 parts of the mixed solution, and then adding 5-15wt% NaOH aqueous solution to adjust the pH to 8-10, stirring for 20-50min, stirring at a speed of 100-300rpm, to obtain a reaction solution; adding 1-5 parts of methanol and 10-30 parts of 1-3wt% sodium bisulfite aqueous solution to the reaction solution, reacting at 70-90°C for 3-8h, and cooling to room temperature to obtain a reaction mixture; S3, the reaction mixture prepared in step S2 is adjusted to a pH value of 11-12 with a 5-15wt% NaOH aqueous solution, heated to 80-100°C, then 3-5 parts of polyetheramine and the drift agent prepared in step S1 are added, stirred for 20-50min at a stirring speed of 100-300rpm, then 5-15 parts of a 5-15wt% formaldehyde aqueous solution are added dropwise at a dropping speed of 0.5-2mL / min, then reacted at 80-100°C for 1-3h to obtain a modified solution, cooled to room temperature, then 40-60 parts of isopropanol are added, stirred for 5-15min at a stirring speed of 100-300rpm, allowed to stand for 20-50min, and then continuously treated with a dialysis bag with a cutoff molecular weight of 800-1500 for 3-6d, the dialysate is collected, and treated by rotary evaporation and freeze drying to obtain a modified anti-drift agent.

[0013] Preferably, the rotary evaporation temperature is 30-50° C., the evaporation pressure is 0.01-0.04 MPa, and the evaporation time is 10-30 min; the freeze-drying temperature is -10--30° C., and the freeze-drying time is 1-5 h.

[0014] Preferably, the mixed solution is prepared by mixing methacrylic acid, hydroxypropyl acrylate and sodium polyoxyethylene fatty alcohol ether sulfate in a mass ratio of 1:3-5:0.8-1.2.

[0015] The invention discloses an application of a special adjuvant for aerial spraying in pesticides. The special adjuvant for aerial spraying is added into a pesticide spray liquid for mixing, and then spraying is performed. The special adjuvant for aerial spraying accounts for 0.1% to 3% of the mass of the pesticide spray liquid.

[0016] The invention comprises the following steps: mixing and grinding xanthan gum, isomeric tridecanol ether potassium salt, sodium dodecyl diphenyl ether disulfonate, ethylene glycol and a silicone defoamer in water to obtain a drift agent; mixing styrene and methacrylic acid with the mixed solution, reacting them in an alkaline environment, adding methanol and sodium bisulfite for compounding to obtain a reaction mixture; adding polyetheramine and the drift agent to the reaction mixture for reaction; performing formaldehyde and isopropanol grafting reaction, dialysis evaporation freezing to obtain the modified drift prevention agent; and adding plant essential oil, a dispersant, a wetting agent, a penetrant, an antifreeze agent and water for compounding to obtain the special auxiliary agent for the anti-flying agent compounding of the invention.

[0017] The special auxiliary agent added in the present invention can increase the droplet diameter within a certain range, promote the droplet sedimentation, and slow down the spray drift. The drift agent is obtained by mixing and grinding xanthan gum, isomeric tridecanol ether potassium salt, sodium dodecyl diphenyl ether disulfonate, ethylene glycol and silicone defoamer in water. Due to the steric hindrance generated by the relatively large molecular structure of the drift agent, the "comb-like" molecular structure effectively forms a flexible barrier on the surface of solid particles. When the solid particles are close to each other, these "comb-like" structures can reduce the conformational entropy by compression or overlap, resulting in a repulsive effect between the pesticide particles. The alcohol group in the drift agent is hydrophilic, which can produce hydration, making the pesticide particles more easily dispersed in the aqueous solution and preventing them from approaching each other. Moreover, xanthan gum can form a three-dimensional network structure in water, and there are a large number of exposed hydroxyls on the surface of the pesticide particles, which can also form hydrogen bonds with the xanthan gum to interact and enhance stability. The phosphate group formed in the drift agent is easy to stretch freely, which is conducive to the rapid formation of xanthan gum hydrogen bonds, anchoring the pesticide particles on the xanthan gum fiber network, and maintaining good stability. After dilution and spraying, small droplets are formed. Due to excellent wettability, small droplets can quickly form irregular large droplets, and the atomization effect is better. The reaction mixture molecules provide electrostatic repulsion, resulting in a lower density of surfactant molecules at the interface. In pesticide formulations, the highly hydrophilic or charged substituents contained in the reaction mixture molecules can accelerate the adsorption process by increasing the area of ​​each molecule and generating lower cohesive forces on the surface. Therefore, it has better foam stability and increases the adsorption affinity between the reaction mixture molecules and the pesticide surface. Further addition of polyetheramine and drift agent reaction can provide more adsorption sites and greater steric hindrance. The addition of polyetheramine increases the sulfonic acid group, so the prepared modified drift control agent can maintain relatively good water solubility. The bridging reaction between the reaction mixture and polyetheramine will further introduce more carbon oxygen bonds, methyl groups, methylene groups and new nitrogen hydrogen bonds. It is beneficial for the special adjuvants for fly control to form multi-point adsorption on the plant surface and improve the adsorption strength. At the same time, the absolute value of the potential becomes higher, the more surface charge, the stronger the electrostatic repulsion. Both of these factors help maintain stable dispersion of pesticide molecules and reduce drift.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1) The present invention mixes and grinds xanthan gum, potassium salt of isomeric tridecyl alcohol ether phosphate, sodium dodecyl diphenyl ether disulfonate, ethylene glycol and silicone defoamer in water to obtain a drift agent, then mixes styrene and methacrylic acid with the mixed solution, reacts in an alkaline environment, and adds methanol and sodium bisulfite to compound to obtain a reaction mixture, and then adds polyetheramine and drift agent to the reaction mixture for reaction, and then undergoes formaldehyde and isopropanol grafting reaction, and then dialyzes, evaporates and freezes to obtain a modified drift control agent. Then, plant essential oils, dispersants, wetting agents, penetrants, antifreeze agents and water are added for compounding to obtain the special auxiliary agent for the mixed anti-drift agent of the present invention. The special auxiliary agent for the mixed anti-drift agent can increase the droplet size within a certain range, promote droplet sedimentation, slow down spray drift, and has good wettability and stability; 2) The present invention adopts a scientific ratio and an aerial spraying adjuvant preparation process to prepare a special adjuvant for aerial spraying, which improves the versatility of use with pesticides, prevents the stickiness and flocculation of the liquid medicine, and is suitable for corn lodging resistance, rice and wheat aerial spraying. DETAILED DESCRIPTION

[0019] The technical solutions of the present invention are described in detail below through specific embodiments. However, it should be clearly stated that these embodiments are for illustration only and are not to be construed as limiting the scope of the present invention.

[0020] The parameters of some raw materials in the embodiments of the present invention are as follows: Polypropylene alcohol, molecular weight: 400; isomeric tridecanol ether potassium salt, Hai'an Petrochemical Plant, Jiangsu Province, model: TXP-10; sodium dodecyl diphenyl ether disulfonate, Guangzhou Zhichun Chemical Co., Ltd., a strong supplier, item number: 0350, CAS: 119345-04-9; sodium sulfate of fatty alcohol polyoxyethylene ether, Jinan Dewang Chemical Co., Ltd., model: AES, CAS: 9004-82-4; polyether amine, Shandong Mingmao New Materials Co., Ltd., molecular weight: 400, model: 675600, CAS: 9046-10-0; silicone defoamer, Guangdong Nanhui New Materials Co., Ltd., item number: CI-301, content: 98%.

[0021] Example 1 A special auxiliary agent suitable for mixing with flying pests, the preparation method is as follows: Add 35g of tea tree essential oil, 15g of polypropylene alcohol, 12g of sodium fatty alcohol polyoxyethylene ether carboxylate, 8g of sodium dioctyl succinate sulfonate, 3g of ethylene glycol, and 8g of modified anti-drift agent into 19g of water, and stir for 3h at a stirring speed of 300rpm to obtain a special auxiliary agent for anti-drift mixing.

[0022] The preparation method of the modified anti-drift agent is as follows: S1, add 5g 5wt% xanthan gum aqueous solution, 2g isomeric tridecanol ether potassium salt, 4g sodium dodecyl diphenyl ether disulfonate, 3g ethylene glycol, 0.2g silicone defoamer to 85.8g water, then add 100g zirconium ball with a diameter of 10mm, grind at 40°C at a speed of 1200r / min for 1.5h to obtain a drift agent; S2, adding 5g of styrene and 10g of methacrylic acid to 18g of the mixed solution, and then adding 10wt% NaOH aqueous solution to adjust the pH to 9, stirring for 30min, the stirring speed is 200rpm, and obtaining a reaction solution; adding 3g of methanol and 20g of 2wt% sodium bisulfite aqueous solution to the reaction solution, reacting at 80°C for 5h, and cooling to room temperature to obtain a reaction mixture; S3, the reaction mixture prepared in step S2 was adjusted to pH 11.5 with 10wt% NaOH aqueous solution, heated to 90°C, then 4g polyetheramine and the drift agent prepared in step S1 were added, stirred for 30min at a stirring speed of 200rpm, then 10g 10wt% formaldehyde aqueous solution was added dropwise at a dropping speed of 1mL / min, and then reacted at 90°C for 2h to obtain a modified liquid, cooled to room temperature, then 50g isopropanol was added, stirred for 10min at a stirring speed of 200rpm, allowed to stand for 30min, and then treated continuously for 4d with a dialysis bag with a cutoff molecular weight of 1000, the dialysate was collected, and treated by rotary evaporation and freeze drying, the rotary evaporation temperature was 40°C, the evaporation pressure was 0.024Mpa, the evaporation time was 20min, the freeze drying temperature was -20°C, and the freeze drying time was 3h to obtain a modified anti-drift agent.

[0023] The mixed solution is prepared by mixing methacrylic acid, hydroxypropyl acrylate and sodium polyoxyethylene fatty alcohol ether sulfate in a mass ratio of 1:4:1.

[0024] Example 2 The preparation method of a special auxiliary agent suitable for flying anti-drift mixing is basically the same as that of Example 1, the only difference being that the preparation method of the modified anti-drift agent is different.

[0025] The modified anti-drift agent is prepared by the following method: S1, add 2g of isomeric tridecanol ether potassium salt, 4g of sodium dodecyl diphenyl ether disulfonate, 3g of ethylene glycol, and 0.2g of silicone defoamer to 85.8g of water, then add 100g of zirconium balls with a diameter of 10mm, grind at 40°C at a speed of 1200r / min for 1.5h to obtain a drift agent; S2, adding 5g of styrene and 10g of methacrylic acid to 18g of the mixed solution, and then adding 10wt% NaOH aqueous solution to adjust the pH to 9, stirring for 30min, the stirring speed is 200rpm, and obtaining a reaction solution; adding 3g of methanol and 20g of 2wt% sodium bisulfite aqueous solution to the reaction solution, reacting at 80°C for 5h, and cooling to room temperature to obtain a reaction mixture; S3, the reaction mixture prepared in step S2 was adjusted to pH 11.5 with 10wt% NaOH aqueous solution, heated to 90°C, then 4g polyetheramine and the drift agent prepared in step S1 were added, stirred for 30min at a stirring speed of 200rpm, then 10g 10wt% formaldehyde aqueous solution was added dropwise at a dropping speed of 1mL / min, and then reacted at 90°C for 2h to obtain a modified liquid, cooled to room temperature, then 50g isopropanol was added, stirred for 10min at a stirring speed of 200rpm, allowed to stand for 30min, and then treated continuously for 4d with a dialysis bag with a cutoff molecular weight of 1000, the dialysate was collected, and treated by rotary evaporation and freeze drying, the rotary evaporation temperature was 40°C, the evaporation pressure was 0.024Mpa, the evaporation time was 20min, the freeze drying temperature was -20°C, and the freeze drying time was 3h to obtain a modified anti-drift agent.

[0026] The mixed solution is prepared by mixing methacrylic acid, hydroxypropyl acrylate and sodium polyoxyethylene fatty alcohol ether sulfate in a mass ratio of 1:4:1.

[0027] Example 3 The preparation method of a special auxiliary agent suitable for flying anti-drift mixing is basically the same as that of Example 1, the only difference being that the preparation method of the modified anti-drift agent is different.

[0028] The modified anti-drift agent is prepared by the following method: S1, add 5g 5wt% xanthan gum aqueous solution, 2g isomeric tridecanol ether potassium salt, 4g sodium dodecyl diphenyl ether disulfonate, 3g ethylene glycol, 0.2g silicone defoamer to 85.8g water, then add 100g zirconium ball with a diameter of 10mm, grind at 40°C at a speed of 1200r / min for 1.5h to obtain a drift agent; S2, 5g of styrene and 10g of methacrylic acid were mixed, and then a 10wt% NaOH aqueous solution was added to adjust the pH to 9, and the mixture was stirred for 30min at a stirring speed of 200rpm to obtain a reaction solution; 3g of methanol and 20g of a 2wt% sodium bisulfite aqueous solution were added to the reaction solution, and the mixture was reacted at 80°C for 5h, and then cooled to room temperature to obtain a reaction mixture; S3, the reaction mixture prepared in step S2 was adjusted to pH 11.5 with 10wt% NaOH aqueous solution, heated to 90°C, then 4g polyetheramine and the drift agent prepared in step S1 were added, stirred for 30min at a stirring speed of 200rpm, then 10g 10wt% formaldehyde aqueous solution was added dropwise at a dropping speed of 1mL / min, and then reacted at 90°C for 2h to obtain a modified liquid, cooled to room temperature, then 50g isopropanol was added, stirred for 10min at a stirring speed of 200rpm, allowed to stand for 30min, and then treated continuously for 4d with a dialysis bag with a cutoff molecular weight of 1000, the dialysate was collected, and treated by rotary evaporation and freeze drying, the rotary evaporation temperature was 40°C, the evaporation pressure was 0.024Mpa, the evaporation time was 20min, the freeze drying temperature was -20°C, and the freeze drying time was 3h to obtain a modified anti-drift agent.

[0029] Example 4 The preparation method of a special auxiliary agent suitable for flying anti-drift mixing is basically the same as that of Example 1, the only difference being that the preparation method of the modified anti-drift agent is different.

[0030] The modified anti-drift agent is prepared by the following method: S1, add 5g 5wt% xanthan gum aqueous solution, 2g isomeric tridecanol ether potassium salt, 4g sodium dodecyl diphenyl ether disulfonate, 3g ethylene glycol, 0.2g silicone defoamer to 85.8g water, then add 100g zirconium ball with a diameter of 10mm, grind at 40°C at a speed of 1200r / min for 1.5h to obtain a drift agent; S2, adding 5g of styrene and 10g of methacrylic acid to 18g of the mixed solution, and then adding 10wt% NaOH aqueous solution to adjust the pH to 9, stirring for 30min, the stirring speed is 200rpm, and obtaining a reaction solution; adding 3g of methanol and 20g of 2wt% sodium bisulfite aqueous solution to the reaction solution, reacting at 80°C for 5h, and cooling to room temperature to obtain a reaction mixture; S3. The reaction mixture prepared in step S2 was adjusted to pH 11.5 with a 10wt% NaOH aqueous solution, heated to 90°C, and then the drift agent prepared in step S1 was added, stirred for 30 min at a stirring speed of 200 rpm, and then 10 g of a 10wt% formaldehyde aqueous solution was added dropwise at a dropping speed of 1 mL / min, and then reacted at 90°C for 2 h to obtain a modified solution, cooled to room temperature, and then 50 g of isopropanol was added, stirred for 10 min at a stirring speed of 200 rpm, and allowed to stand for 30 min, and then treated continuously for 4 d with a dialysis bag with a cutoff molecular weight of 1000, the dialysate was collected, and treated by rotary evaporation and freeze drying, the rotary evaporation temperature was 40°C, the evaporation pressure was 0.024 MPa, the evaporation time was 20 min, the freeze drying temperature was -20°C, and the freeze drying time was 3 h to obtain a modified anti-drift agent.

[0031] The mixed solution is prepared by mixing methacrylic acid, hydroxypropyl acrylate and sodium polyoxyethylene fatty alcohol ether sulfate in a mass ratio of 1:4:1.

[0032] Comparative Example 1 The preparation method of a special auxiliary agent suitable for flying anti-drift mixing is basically the same as that of Example 1, the only difference being that the preparation method of the modified anti-drift agent is different.

[0033] The modified anti-drift agent is prepared by the following method: S1, add 2g of isomeric tridecanol ether potassium salt, 4g of sodium dodecyl diphenyl ether disulfonate, 3g of ethylene glycol, and 0.2g of silicone defoamer to 85.8g of water, then add 100g of zirconium balls with a diameter of 10mm, grind at 40°C at a speed of 1200r / min for 1.5h to obtain a drift agent; S2, 5g of styrene and 10g of methacrylic acid were mixed, and then a 10wt% NaOH aqueous solution was added to adjust the pH to 9, and the mixture was stirred for 30min at a stirring speed of 200rpm to obtain a reaction solution; 3g of methanol and 20g of a 2wt% sodium bisulfite aqueous solution were added to the reaction solution, and the mixture was reacted at 80°C for 5h, and then cooled to room temperature to obtain a reaction mixture; S3. The reaction mixture prepared in step S2 was adjusted to pH 11.5 with a 10wt% NaOH aqueous solution, heated to 90°C, and then the drift agent prepared in step S1 was added, stirred for 30 min at a stirring speed of 200 rpm, and then 10 g of a 10wt% formaldehyde aqueous solution was added dropwise at a dropping speed of 1 mL / min, and then reacted at 90°C for 2 h to obtain a modified solution, cooled to room temperature, and then 50 g of isopropanol was added, stirred for 10 min at a stirring speed of 200 rpm, and allowed to stand for 30 min, and then treated continuously for 4 d with a dialysis bag with a cutoff molecular weight of 1000, the dialysate was collected, and treated by rotary evaporation and freeze drying, the rotary evaporation temperature was 40°C, the evaporation pressure was 0.024 MPa, the evaporation time was 20 min, the freeze drying temperature was -20°C, and the freeze drying time was 3 h to obtain a modified anti-drift agent.

[0034] Comparative Example 2 The preparation method of a special auxiliary agent suitable for flying pest control mixing is basically the same as that in Example 1, the only difference is that: no modified anti-drift agent is added in the preparation method of the special auxiliary agent for flying pest control mixing.

[0035] Test Example 1 Wettability test The test was conducted with reference to the master's thesis (Development and Performance Evaluation of 30% Pyraclostrobin Water Suspension Concentrate and 30% Imidacloprid Water Suspension Concentrate of Aerial Control Agents, Hebei Agricultural University, Sun Tongtong, 2018). 50 mL of the special adjuvants prepared in the above embodiments and comparative examples for aerial control were respectively placed in a 100 mL small beaker, and then a round canvas piece (diameter 4.5 cm) was placed at the mouth of the beaker and naturally dropped. When the round canvas piece reached the liquid surface of the solution, a stopwatch was started to time and the time when the round canvas piece was completely wetted was recorded. The test results are shown in Table 1.

[0036] Table 1: Wettability test results

[0037] Test Example 2 Anti-drift performance test A fan was used to simulate field wind, the wind speed was set at 4m / s, the solution was sprayed with a backpack electric sprayer, and water-sensitive paper was used to collect droplets. The anti-drift performance of the additive was evaluated by analyzing various parameters of the collected droplets. The larger the droplet size, droplet coverage and droplet deposition per unit area, the better the anti-drift performance of the additive in theory.

[0038] The special auxiliary agent for flying defense prepared in the embodiment and comparative example was added with water to prepare a 1% solution. The fan was turned on and the water-sensitive paper was placed on the ground 0.5m away from the fan. The liquid medicine was sprayed with a sprayer. The nozzle and the fan were at the same height and the spraying direction was perpendicular to the wind direction. After the water-sensitive paper collected the droplets, it was naturally dried. The dried water-sensitive paper was scanned into pictures in turn and stored in the computer, and then the various parameters of the droplets were analyzed using the Depositscan software. The test results are shown in Table 2.

[0039] Table 2: Anti-drift performance test results

[0040] Test Example 3 Field efficacy testing 1. Corn field test 33mL 30vt% ethylenediamine ethyl ester aqueous solution, 27mL 40vt% pyraclostrobin aqueous solution, 67mL foliar fertilizer, 20mL special adjuvant for aerial spraying prepared in the examples and comparative examples were added with water to prepare 2000mL aerial spraying liquid, and the aerial spraying liquid without adding the special adjuvant for aerial spraying prepared in the examples and comparative examples was used as a blank group. DJI eight-rotor plant protection drone was used for field spraying in corn fields, with a nozzle pressure of 0.35MPa, a spray width of 3.0m, a total flow rate of 0.8L / min, and a spray volume of 30L / hm 2 The flight height is 1.5m from the blade tip and the flight speed is 3.3m / s. Each test area is 30.0m long, 12.0m wide and covers an area of ​​360m 2 After applying the pesticide, the spray droplets were collected randomly from the upper, middle and lower leaves of corn, and the various parameters of the droplets were analyzed using the Depositscan software.

[0041] 2. Rice field test 40mL 5vt% avermectin aqueous solution, 40mL 40vt% tricyclazole aqueous solution, 60mL foliar fertilizer, 20mL 25vt% pymetrozine aqueous solution, 30mL 24vt% thiothiocarb, 10mL of the special adjuvant for aerial spraying prepared in the examples and comparative examples were added with water to prepare 1000mL aerial spraying liquid, and the aerial spraying liquid without the special adjuvant for aerial spraying prepared in the examples and comparative examples was used as the blank group. DJI eight-rotor plant protection drone was used for field spraying in rice fields, with a nozzle pressure of 0.35MPa, a spray width of 3.0m, a total flow rate of 0.8L / min, and a spray volume of 30L / hm 2 The flight height is 1.5m from the blade tip and the flight speed is 3.3m / s. Each test area is 30.0m long, 12.0m wide and covers an area of ​​360m 2After applying the pesticide, the leaves of rice at three different positions, upper, middle and lower, were randomly selected to collect spray droplets, and the various parameters of the droplets were analyzed using Depositscan software.

[0042] 3. Wheat field test 40mL 30vt% phoxim aqueous solution, 50mL 43vt% tebuconazole aqueous solution, 100g potassium dihydrogen phosphate, 10g brassinolide, 10mL special adjuvant for aerial spraying prepared in the examples and comparative examples were added with water to prepare 1000mL aerial spraying liquid, and the aerial spraying liquid without adding the special adjuvant for aerial spraying prepared in the examples and comparative examples was used as a blank group. DJI eight-rotor plant protection drone was used for field spraying in wheat fields, with a nozzle pressure of 0.35MPa, a spray width of 3.0m, a total flow rate of 0.8L / min, and a spray volume of 30L / hm 2 The flight height is 1.5m from the blade tip and the flight speed is 3.3m / s. Each test area is 30.0m long, 12.0m wide and covers an area of ​​360m 2 After applying the pesticide, leaves from the upper, middle and lower parts of the wheat were randomly selected to collect spray droplets, and the Depositscan software was used to analyze the various parameters of the droplets.

[0043] The test results are averaged and are shown in Table 3.

[0044] Table 3: Field test results

[0045] From the test results of Tables 1 to 3, it can be seen that the wettability, anti-drift performance and field test of Example 1 are the best in comprehensive terms. The possible reason is that the present invention obtains a drift agent by mixing and grinding xanthan gum, isomeric tridecyl alcohol ether potassium salt, sodium dodecyl diphenyl ether disulfonate, ethylene glycol and silicone defoamer in water, and then mixing styrene and methacrylic acid with the mixed solution, reacting in an alkaline environment, adding methanol and sodium bisulfite to compound to obtain a reaction mixture, adding polyether amine and drift agent to the reaction mixture to react, and then undergoing formaldehyde and isopropanol grafting reaction, dialyzing evaporation and freezing to obtain a modified anti-drift agent; and then compounding by adding plant essential oil, dispersant, wetting agent, penetrant, antifreeze agent and water to obtain the special auxiliary agent for flying prevention mixing of the present invention.

[0046] The special auxiliary agent added in the present invention can increase the droplet diameter within a certain range, promote the precipitation of droplets, and slow down the drift of spray. The drift agent is obtained by mixing and grinding xanthan gum, isomeric tridecanol ether potassium salt, sodium dodecyl diphenyl ether disulfonate, ethylene glycol and silicone defoamer in water. Due to the steric hindrance generated by the relatively large molecular structure of the drift agent, the "comb-like" molecular structure effectively forms a flexible barrier on the surface of solid particles. When the solid particles are close to each other, these "comb-like" structures can reduce the conformational entropy by compression or overlap, resulting in a repulsive effect between the pesticide particles. The alcohol group in the drift agent is hydrophilic, which can produce hydration, making the pesticide particles more easily dispersed in the aqueous solution and preventing them from approaching each other. Moreover, xanthan gum can form a three-dimensional network structure in water, and there are a large number of exposed hydroxyls on the surface of the pesticide particles, which can also form hydrogen bonds with the xanthan gum to interact and enhance stability. The formed phosphate group is easy to stretch freely, which is conducive to the rapid formation of xanthan gum hydrogen bonds, anchoring the pesticide particles on the xanthan gum fiber network, and maintaining good stability. After dilution and spraying, small droplets are formed. Due to excellent wettability, small droplets can quickly form irregular large droplets, and the atomization effect is better. The reaction mixture molecules provide electrostatic repulsion, resulting in a lower density of surfactant molecules at the interface. In pesticide formulations, the highly hydrophilic or charged substituents contained in the reaction mixture molecules can accelerate the adsorption process by increasing the area of ​​each molecule and generating lower cohesive forces on the surface. Therefore, it has better foam stability and increases the adsorption affinity between the reaction mixture molecules and the pesticide surface. Further addition of polyetheramine and drift agent reaction can provide more adsorption sites and greater steric hindrance. The addition of polyetheramine increases the sulfonic acid group, so the prepared modified drift control agent can maintain relatively good water solubility. The bridging reaction between the reaction mixture and polyetheramine will further introduce more carbon oxygen bonds, methyl groups, methylene groups and new nitrogen hydrogen bonds. It is beneficial for the special adjuvants for fly control to form multi-point adsorption on the plant surface and improve the adsorption strength. At the same time, the absolute value of the potential becomes higher, the more surface charge, the stronger the electrostatic repulsion. Both of these factors help maintain stable dispersion of pesticide molecules and reduce drift.

Claims

1. A special auxiliary agent suitable for mixing with flying pests, characterized in that: The invention comprises the following components in weight percentage: 30-40% of plant essential oil, 10-20% of dispersant, 10-15% of wetting agent, 5-10% of penetrant, 2-4% of antifreeze agent, 5-10% of modified anti-drift agent and 15-25% of water.

2. The special auxiliary agent suitable for flying pest control mixing as claimed in claim 1, characterized in that: The plant essential oil is at least one of black pepper essential oil, orange peel essential oil, red pepper essential oil, green pepper essential oil, tea tree essential oil, garlic essential oil, clove bud essential oil, clove leaf essential oil and cinnamon essential oil.

3. The special auxiliary agent suitable for flying pest control mixing as claimed in claim 1, characterized in that: The dispersant is at least one of sodium polyacrylate, polypropylene alcohol, fatty alcohol polyoxyethylene ether sulfate, fatty alcohol polyoxypropylene polyoxyethylene ether, lignin sulfonate, and polycarboxylate.

4. The special auxiliary agent suitable for flying pest control mixing as claimed in claim 1, characterized in that: The wetting agent is at least one of sodium fatty alcohol polyoxyethylene ether carboxylate, sodium fatty alcohol polyoxyethylene ether sulfate, sodium butyl naphthalene sulfonate, sodium secondary alkyl sulfonate, sodium hexadecylbenzene sulfonate, sodium n-hexadecyl sulfate, fatty amine polyoxyethylene ether, and sodium dioctyl sulfosuccinate.

5. The special auxiliary agent suitable for flying pest control mixing as claimed in claim 1, characterized in that: The penetrant is at least one of dioctyl sodium succinate sulfonate, silicone polyoxyethylene ether, fatty alcohol, succinate, alcohol ether succinate, phenol ether succinate, alcohol ether phosphate, isosorbide and urea; the antifreeze is at least one of ethylene glycol, glycerol and polyethylene glycol.

6. The special auxiliary agent suitable for flying pest control mixing as claimed in claim 1, characterized in that: The preparation method of the modified anti-drift agent is as follows, in parts by weight: S1, adding 2-8 parts of 3-8wt% xanthan gum aqueous solution, 1-3 parts of isomeric tridecanol ether potassium salt, 2-5 parts of sodium dodecyl diphenyl ether disulfonate, 1-5 parts of ethylene glycol, and 0.1-0.3 parts of silicone defoamer to 80-90 parts of water, and then adding 50-150 parts of zirconium balls with a diameter of 5-15 mm, grinding at 30-50° C. at a speed of 1000-1500 r / min for 1-3 hours to obtain a drift agent; S2, adding 3-8 parts of styrene and 8-12 parts of methacrylic acid to 15-20 parts of the mixed solution, and then adding 5-15wt% NaOH aqueous solution to adjust the pH to 8-10, stirring for 20-50min, stirring at a speed of 100-300rpm, to obtain a reaction solution; adding 1-5 parts of methanol and 10-30 parts of 1-3wt% sodium bisulfite aqueous solution to the reaction solution, reacting at 70-90°C for 3-8h, and cooling to room temperature to obtain a reaction mixture; S3, the reaction mixture prepared in step S2 is adjusted to a pH value of 11-12 with a 5-15wt% NaOH aqueous solution, heated to 80-100°C, then 3-5 parts of polyetheramine and the drift agent prepared in step S1 are added, stirred for 20-50min at a stirring speed of 100-300rpm, then 5-15 parts of a 5-15wt% formaldehyde aqueous solution are added dropwise at a dropping speed of 0.5-2mL / min, then reacted at 80-100°C for 1-3h to obtain a modified solution, cooled to room temperature, then 40-60 parts of isopropanol are added, stirred for 5-15min at a stirring speed of 100-300rpm, allowed to stand for 20-50min, and then continuously treated with a dialysis bag with a cutoff molecular weight of 800-1500 for 3-6d, the dialysate is collected, and treated by rotary evaporation and freeze drying to obtain a modified anti-drift agent.

7. The special auxiliary agent suitable for flying pest control mixing as claimed in claim 1, characterized in that: The rotary evaporation temperature is 30-50° C., the evaporation pressure is 0.01-0.04 MPa, and the evaporation time is 10-30 min; the freeze-drying temperature is -10--30° C., and the freeze-drying time is 1-5 h.

8. The special auxiliary agent suitable for flying pest control mixing as claimed in claim 1, characterized in that: The mixed solution is prepared by mixing methacrylic acid, hydroxypropyl acrylate and sodium polyoxyethylene fatty alcohol ether sulfate in a mass ratio of 1:3-5:0.8-1.

2.

9. The method for preparing a special auxiliary agent suitable for fly dung bean spraying as claimed in any one of claims 1 to 8, characterized in that: The method comprises the following steps: weighing various raw materials according to weight percentage, adding plant essential oil, dispersant, wetting agent, penetrant, antifreeze agent and modified anti-drift agent into water, stirring and mixing for 2-5 hours at a stirring speed of 100-500 rpm, and obtaining a special auxiliary agent for anti-drift mixing.

10. Use of the special adjuvant suitable for aerial pest control mixing as claimed in any one of claims 1 to 8 in pesticides, characterized in that: The special auxiliary agent mixed for aerial spraying is added into the pesticide spray liquid for mixing, and then spraying is performed; the special auxiliary agent mixed for aerial spraying accounts for 0.1% to 3% of the mass of the pesticide spray liquid.

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