Phosphate ester type pesticide emulsifier suitable for aerial application and preparation method thereof
By using specific component ratios and a simple preparation process, the problems of emulsification instability, poor anti-drift properties, and easy precipitation at low temperatures of phosphate ester pesticide emulsifiers in drone aerial spraying operations have been solved, achieving efficient and environmentally friendly pesticide dispersion and application, and making it suitable for complex aerial spraying environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 冯云凯
- Filing Date
- 2026-04-09
- Publication Date
- 2026-06-26
AI Technical Summary
Existing phosphate ester-based pesticide emulsifiers are difficult to adapt to drone-based aerial spraying operations, and have problems such as emulsification instability, poor anti-drift properties, easy precipitation at low temperatures, large amount of foam, and insufficient biodegradability. In addition, the preparation process is complex and costly.
By employing a specific ratio of isomeric alcohol polyoxyethylene ether phosphate, nonionic surfactant, co-emulsifier, and anti-drift modifier, combined with a simple preparation process, a phosphate ester-type pesticide emulsifier is formed that combines emulsification stability, anti-drift properties, low-temperature stability, and biodegradability.
It maintains emulsification stability at high dilution ratios, significantly improves anti-drift performance, has no precipitation at low temperatures, reduces foaming, meets green and environmental protection requirements, adapts to the needs of aerial spraying operations in different regions and seasons, and reduces production costs.
Smart Images
Figure CN122271303A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of pesticide adjuvant technology, specifically relating to a phosphate ester type pesticide emulsifier suitable for aerial spraying and its preparation method, which is particularly suitable for the emulsification and dispersion of various pesticide formulations in drone aerial spraying operations, thereby improving the efficacy and efficiency of aerial spraying. Background Technology
[0002] Drone-based aerial spraying, as a highly efficient means of pest and disease control in modern agriculture, boasts advantages such as high operational efficiency, wide coverage, time and labor savings, and minimal damage to crops. It has been widely applied to the control of pests and diseases in field crops and cash crops. In aerial spraying operations, pesticide emulsifiers are key auxiliary components. Their performance directly affects the emulsification and dispersion effects, atomization performance, anti-drift ability, and efficacy of pesticide formulations, thus determining the quality and efficiency of the aerial spraying operation.
[0003] Phosphate ester surfactants are widely used in the preparation of pesticide emulsifiers due to their excellent emulsifying, dispersing, wetting, and penetrating properties, as well as their good biodegradability and environmental friendliness. However, existing phosphate ester-based pesticide emulsifiers are mostly designed for traditional manual or mechanical spraying, making them difficult to adapt to the special requirements of aerial spraying operations and exhibiting several technical defects: First, aerial spraying operations require high dilution ratios (usually the concentration of pesticides applied by drones). Existing emulsifiers are prone to emulsification instability, stratification, and precipitation at high dilution ratios, leading to uneven pesticide dispersion and affecting efficacy. Second, during aerial spraying atomization, the droplet size is small, and existing emulsifiers lack effective anti-drift properties, easily causing droplet drift, resulting in pesticide waste and potentially causing environmental pollution and crop damage. Third, aerial spraying operations are conducted in complex environments with large temperature fluctuations. Existing emulsifiers have poor low-temperature stability, easily causing component precipitation and system stratification around 0°C, rendering them unusable. Fourth, some phosphate ester-based emulsifiers produce a large amount of foam, which can easily clog nozzles during aerial spraying atomization, affecting operational continuity, and their insufficient biodegradability does not meet the development requirements of green pesticide adjuvants.
[0004] In existing technologies, such as the pesticide surfactant compositions disclosed in patent literature, although they emphasize low-temperature stability and biodegradability, they are not designed to meet the core requirements of aerial spraying operations, such as anti-drift and high-dilution stability, and thus cannot meet the requirements for aerial spraying. Some pesticide adjuvants, while possessing certain wetting and penetrating properties, have limited functionality and lack emulsification stability and anti-drift modification, making them difficult to adapt to the complex operational scenarios of aerial spraying. Furthermore, the preparation processes of traditional phosphate ester emulsifiers often suffer from harsh reaction conditions, numerous byproducts, and high production costs, limiting their widespread application in the field of aerial spraying.
[0005] Therefore, in response to the specific needs of aerial spraying operations, it is of great significance to develop a phosphate ester-type pesticide emulsifier that combines excellent emulsification stability, anti-drift properties, low foaming properties, low-temperature stability, and environmental friendliness, while also having a simple preparation process and low cost. This would address the shortcomings of existing technologies and promote the development of aerial spraying technology, improve pesticide utilization, and reduce environmental pollution. Summary of the Invention
[0006] The purpose of this invention is to overcome the technical defects of existing phosphate ester pesticide emulsifiers, such as inability to adapt to the needs of aerial spraying operations, poor emulsification stability, poor anti-drift properties, and easy precipitation at low temperatures. This invention provides a phosphate ester pesticide emulsifier suitable for aerial spraying and its preparation method. This emulsifier can meet the requirements of high dilution ratio, rapid atomization, anti-drift, and wide temperature adaptability for aerial spraying. Moreover, the preparation process is simple, environmentally friendly, and has low production costs, and can be widely used in aerial spraying operations of various pesticides. Technical solution
[0007] To achieve the above objectives, the present invention adopts the following technical solution: A phosphate ester-type pesticide emulsifier suitable for aerial application, comprising the following components by mass: 40-60 parts of isomeric alcohol polyoxyethylene ether phosphate, 20-35 parts of nonionic surfactant, 5-15 parts of co-emulsifier, and 2-8 parts of anti-drift modifier.
[0008] Furthermore, the isomeric alcohol polyoxyethylene ether phosphate is the core active component, and its structural formula is R1O—(C2H4O). n —PO(OH)2, where R1 is C 10 Or C 13 The isomeric alkyl group, where n is the average molar number of EO additions, ranging from 5 to 10. This component, through precise control of the molar number of EO additions and the alkyl structure, balances emulsification, water solubility, and low foaming properties, meeting the high dilution requirements of aerial spraying. Simultaneously, it enhances the biodegradability of the emulsifier, complying with green environmental protection requirements. Specifically, in the isomeric alcohol polyoxyethylene ether phosphate, the molar ratio of monoester to diester is 50:45 to 60:35, ensuring an optimal balance between emulsification stability and penetration performance.
[0009] Furthermore, the nonionic surfactant is a fatty acid polyoxyalkylene ether with a narrowing rate ≥55% by mass and the structural formula R2CO(EO). m (PO) kOR3, where R2CO is a saturated or unsaturated fatty acid residue with 14-22 carbon atoms, R3 is an alkyl group with 1-3 carbon atoms, m is an integer from 2 to 10, and k is an integer from 1 to 4. The addition of EO and PO is a block polymerization. This nonionic surfactant has a good synergistic effect with the core component, isomeric alcohol polyoxyethylene ether phosphate, which can significantly improve the emulsifying and dispersing ability and low-temperature stability of the emulsifier, avoid the precipitation of components under low-temperature conditions, and reduce the amount of foam produced by the emulsifier, thus preventing nozzle clogging during aerial spraying atomization.
[0010] Furthermore, the co-emulsifier is one or a mixture of two of propylene glycol methyl ether acetate and ethylene glycol ethyl ether in any proportion. The co-emulsifier can reduce the interfacial tension of the system, promote the fusion of the pesticide oil and aqueous phases, improve emulsion stability, and simultaneously improve the solubility of the emulsifier, ensuring a uniform and stable dispersion system even at high dilution ratios, and avoiding problems such as layering and precipitation.
[0011] Furthermore, the anti-drift modifier is an organosilicon-modified polyether with a cloud point of 60-80℃ and a surface tension ≤28mN / m. This anti-drift modifier can effectively reduce the surface tension of droplets, increase the droplet size, reduce droplet drift, and at the same time improve the adhesion of droplets to the crop surface, reduce pesticide loss, and improve efficacy. Its cloud point design is adapted to the temperature range of aerial spraying operations, ensuring stable anti-drift effects under different ambient temperatures.
[0012] Preferably, the optimal proportions of the components, by weight, are: 50 parts isomeric alcohol polyoxyethylene ether phosphate, 28 parts nonionic surfactant, 10 parts co-emulsifier, and 5 parts anti-drift modifier. This optimal proportion allows the emulsifier to achieve the best performance in all aspects, taking into account emulsification stability, anti-drift properties, low foaming, and low-temperature stability, fully meeting the core requirements of aerial spraying operations.
[0013] Furthermore, the performance indicators of the emulsifier described in this invention meet the following requirements: at commonly used dilution concentrations for aerial spraying, no visible precipitation is observed after standing for 1 hour, no precipitation is observed after standing for 4 hours and after being inverted, and no precipitation is observed after standing for 24 hours and after standing for 0.5 hours, meeting the stringent requirements for emulsification stability in aerial spraying; no precipitation or stratification is observed after standing for 72 hours at 0°C, adapting to the needs of aerial spraying operations in different regions and seasons; and the biodegradability rate is ≥80%, meeting the development standards for green pesticide adjuvants and reducing environmental pollution.
[0014] This invention also discloses a method for preparing the above-mentioned phosphate ester pesticide emulsifier suitable for aerial spraying, comprising the following steps: (1) Esterification reaction: Add isomeric alcohol polyoxyethylene ether to the reaction vessel, stir and heat to 45-55℃, add powdered phosphorus pentoxide at a uniform rate, control the temperature of the reaction system to not exceed 60℃ (preferably not exceed 55℃) during the dropping process, the dropping rate is 2s / drop, and control the temperature of the reaction system to be below 40℃ when adding materials to avoid excessive local reaction and generation of by-products; after the dropping is completed, heat to 70-80℃ and keep the reaction at this temperature for 3-5h to obtain crude isomeric alcohol polyoxyethylene ether phosphate; the molar ratio of isomeric alcohol polyoxyethylene ether to phosphorus pentoxide is 3.2:1~5.6:1, which can ensure that the esterification reaction is fully carried out, reduce the residue of unreacted raw materials, and improve the purity of the crude product.
[0015] (2) Neutralization reaction: Cool the crude product obtained in step (1) to 40-50℃, slowly add triethanolamine for neutralization, adjust the pH of the system to 6.5-7.5, stir the reaction for 1h, and obtain the neutralized product; the molar amount of the triethanolamine is 4-6 times the molar amount of phosphorus pentoxide used in step (1) to ensure that the neutralization reaction is thorough and to avoid residual acidic substances affecting the stability and safety of the emulsifier.
[0016] (3) Compound modification: Add nonionic surfactant and co-emulsifier to the neutralized product obtained in step (2) in sequence, and stir and mix for 30-60 min at 50-60℃ and 100-200 rpm to ensure that the components are uniformly mixed; then add anti-drift modifier and continue stirring for 20-40 min to fully disperse the anti-drift modifier in the system and achieve anti-drift modification of the emulsifier; in addition, 0.1-0.5 parts of 50% hypophosphite solution can be added as a stabilizer during stirring to prevent the system from oxidizing and deteriorating, and 0.1-0.5 parts of 35% hydrogen peroxide solution can be added as a decolorizing agent to improve the appearance and color of the emulsifier.
[0017] (4) Post-processing: Cool the mixture obtained in step (3) to room temperature, and filter it through a 1μm PP membrane and a 300-mesh stainless steel filter in sequence to remove impurities and unreacted microparticles in the system, ensuring the purity and uniformity of the emulsifier; after filtration, 0.1-2 parts of deionized water can be added as needed to adjust the viscosity of the system, so that the emulsifier is more suitable for the atomization requirements of aerial spraying, and finally obtain a phosphate ester type pesticide emulsifier suitable for aerial spraying. Beneficial effects
[0018] Compared with the prior art, the present invention has the following advantages: 1. Adapting to the core needs of aerial spraying and solving technical pain points: This invention specifically designs anti-drift modifiers and component ratios, enabling the emulsifier to maintain excellent emulsification stability even at high dilution ratios in aerial spraying. It meets the requirements of no visible precipitation after standing for 1 hour after dilution, no precipitation after standing for 4 hours and after inversion, no precipitation after standing for 24 hours and after standing for 0.5 hours. At the same time, it significantly improves anti-drift performance, reduces droplet drift, and improves pesticide utilization. It solves the core problems of unstable emulsification and easy drift of existing emulsifiers in aerial spraying. Moreover, it has excellent low-temperature stability, with no precipitation or stratification after standing for 72 hours at 0℃, making it suitable for aerial spraying operations in different seasons and regions.
[0019] 2. Excellent overall performance and strong practicality: The emulsifier of this invention has low foaming properties, wetting and penetrating properties, and biodegradability. The low foaming design can avoid nozzle clogging during aerial spraying and ensure continuous operation; good wetting and penetrating properties can promote the adhesion and absorption of pesticides on the crop surface and improve efficacy; the biodegradability rate is ≥80%, which meets the green pesticide adjuvant standard and reduces environmental pollution; it can be widely used in aerial spraying operations of various pesticide emulsifiable oils, water emulsions, and microemulsions, and has strong adaptability.
[0020] 3. Simple preparation process and low cost: The preparation process of this invention does not require harsh reaction conditions, the steps are simple, and it is easy to realize industrial production; the raw materials used are widely available and low in cost, and no toxic or harmful by-products are generated in the reaction process, making it green and environmentally friendly, which can effectively reduce production costs and enhance the market competitiveness of the product.
[0021] 4. Significant synergistic effect: The core component, isomeric alcohol polyoxyethylene ether phosphate, works synergistically with nonionic surfactants, co-emulsifiers, and anti-drift modifiers. This not only improves the individual performance of the emulsifier but also achieves a comprehensive improvement in emulsification stability, anti-drift properties, low foaming properties, and low-temperature stability. The overall performance is superior to existing single-component or simply compounded phosphate ester emulsifiers. Detailed Implementation
[0022] The present invention will be further described in detail below with reference to specific embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. Example
[0023] A phosphate ester-based pesticide emulsifier suitable for aerial spraying, comprising the following components by weight: 40 parts of isomeric alcohol polyoxyethylene ether phosphate (R1 is C 10 Isomerized alkyl, n=5, monoester to diester molar ratio 50:45), fatty acid polyoxyalkylene ether 20 parts (narrowing rate 55%, R2CO is C 14Saturated fatty acid residues, R3 is methyl, m=2, k=1, EO and PO block polymerization), 5 parts of propylene glycol methyl ether acetate, 2 parts of organosilicon modified polyether (cloud point 60℃, surface tension 28mN / m).
[0024] The preparation method is as follows: (1) Esterification reaction: 40 parts of isomeric alcohol polyoxyethylene ether were added to the reaction vessel, stirred and heated to 45°C, and powdered phosphorus pentoxide (molar ratio of isomeric alcohol polyoxyethylene ether to phosphorus pentoxide 3.2:1) were added dropwise at a rate of 2s / drop. The temperature was controlled to be below 40°C when adding the material. After the addition was completed, the temperature was raised to 70°C and the reaction was kept at this temperature for 3 hours to obtain the crude product. (2) Neutralization reaction: The crude product was cooled to 40°C, triethanolamine (molar amount of which is 4 times that of phosphorus pentoxide) was added, the pH was adjusted to 6.5, and the reaction was stirred for 1 h to obtain the neutralized product; (3) Compound modification: Add 20 parts of fatty acid polyoxyalkylene ether and 5 parts of propylene glycol methyl ether acetate to the neutralization product, stir at 50°C and 100 rpm for 30 min, then add 2 parts of organosilicon modified polyether and continue stirring for 20 min. (4) Post-treatment: Cool to room temperature and filter through a 1μm PP membrane and a 300-mesh stainless steel filter in sequence to obtain the target emulsifier.
[0025] Performance testing: At the concentration used for aerial spraying, the emulsifier showed no visible precipitation after standing for 1 hour, no precipitation after standing for 4 hours and after being inverted, and no precipitation after standing for 24 hours and after standing for 0.5 hours; no precipitation or stratification was observed after standing at 0℃ for 72 hours; the biodegradability rate was 80%; the surface tension was 28 mN / m, indicating good anti-drift performance; the foaming amount was low, and there was no nozzle clogging. Example
[0026] A phosphate ester-based pesticide emulsifier suitable for aerial spraying, comprising the following components by weight: 50 parts of isomeric alcohol polyoxyethylene ether phosphate (R1 is C 13 The product consists of: isomeric alkyl groups (n=8, monoester to diester molar ratio 55:40), 28 parts of fatty acid polyoxyalkylene ether (narrowing rate 60%, R2CO is C18 unsaturated fatty acid residue, R3 is ethyl, m=6, k=2, EO and PO block polymerization), 10 parts of ethylene glycol ethyl ether, and 5 parts of organosilicon modified polyether (cloud point 70℃, surface tension 25mN / m).
[0027] The preparation method is as follows: (1) Esterification reaction: 50 parts of isomeric alcohol polyoxyethylene ether were added to the reaction vessel, stirred and heated to 50°C, and powdered phosphorus pentoxide (molar ratio of isomeric alcohol polyoxyethylene ether to phosphorus pentoxide 4.5:1) were added dropwise at a rate of 2s / drop. The temperature was controlled to be below 40°C when adding the material. After the addition was completed, the temperature was raised to 75°C and the reaction was kept at the temperature for 4 hours to obtain the crude product. (2) Neutralization reaction: The crude product was cooled to 45°C, triethanolamine (molar amount of which is 5 times that of phosphorus pentoxide) was added, the pH was adjusted to 7.0, and the reaction was stirred for 1 h to obtain the neutralized product; (3) Compound modification: Add 28 parts of fatty acid polyoxyalkylene ether and 10 parts of ethylene glycol ethyl ether to the neutralization product, stir at 55°C and 150 rpm for 45 min, add 0.3 parts of 50% hypophosphoric acid solution and 0.3 parts of 35% hydrogen peroxide solution, then add 5 parts of organosilicon modified polyether, and continue stirring for 30 min. (4) Post-treatment: Cool to room temperature, filter through a 1μm PP membrane and a 300-mesh stainless steel filter in sequence, add 1 part of deionized water to adjust the viscosity, and obtain the target emulsifier.
[0028] Performance testing: At the aerial spraying dilution concentration, this emulsifier showed no visible precipitation after standing for 1 hour, no precipitation after standing for 4 hours and after being inverted, and no precipitation after standing for 24 hours and after standing for 0.5 hours; no precipitation or stratification after standing at 0℃ for 72 hours; a biodegradability rate of 85%; a surface tension of 25 mN / m, exhibiting excellent anti-drift performance; extremely low foaming, ensuring good operational continuity; strong emulsification stability, and compatibility with various pesticide formulations. Example
[0029] A phosphate ester-based pesticide emulsifier suitable for aerial spraying, comprising the following components by weight: 60 parts of isomeric alcohol polyoxyethylene ether phosphate (R1 is C 10 The product consists of: isomeric alkyl groups (n=10, monoester to diester molar ratio 60:35), 35 parts of fatty acid polyoxyalkylene ether (narrowing rate 65%, R2CO is C22 saturated fatty acid residue, R3 is propyl, m=10, k=4, EO and PO block polymerization), 15 parts of a mixture of propylene glycol methyl ether acetate and ethylene glycol ethyl ether (mass ratio 1:1), and 8 parts of organosilicon-modified polyether (cloud point 80℃, surface tension 22mN / m).
[0030] The preparation method is as follows: (1) Esterification reaction: 60 parts of isomeric alcohol polyoxyethylene ether were added to the reaction vessel, stirred and heated to 55°C, and powdered phosphorus pentoxide (molar ratio of isomeric alcohol polyoxyethylene ether to phosphorus pentoxide 5.6:1) were added dropwise at a rate of 2s / drop. The temperature was controlled to be below 40°C when adding the material. After the addition was completed, the temperature was raised to 80°C and the reaction was kept at the temperature for 5h to obtain the crude product. (2) Neutralization reaction: The crude product was cooled to 50°C, triethanolamine (molar amount of which is 6 times that of phosphorus pentoxide) was added, the pH was adjusted to 7.5, and the reaction was stirred for 1 h to obtain the neutralized product; (3) Compound modification: Add 35 parts of fatty acid polyoxyalkylene ether and 15 parts of mixed co-emulsifier to the neutralization product, stir at 60°C and 200 rpm for 60 min, add 0.5 parts of 50% hypophosphoric acid solution and 0.5 parts of 35% hydrogen peroxide solution, then add 8 parts of organosilicon modified polyether, and continue stirring for 40 min. (4) Post-treatment: Cool to room temperature, filter through a 1μm PP membrane and a 300-mesh stainless steel filter in sequence, add 2 parts of deionized water to adjust the viscosity, and obtain the target emulsifier.
[0031] Performance testing: At the aerial spraying dilution concentration, this emulsifier showed no visible precipitation after standing for 1 hour, no precipitation after standing for 4 hours and after being inverted, and no precipitation after standing for 24 hours and after standing for 0.5 hours; no precipitation or stratification was observed after standing at 0℃ for 72 hours; the biodegradability rate was 88%; the surface tension was 22 mN / m, demonstrating outstanding anti-drift effect; the foaming amount was extremely low, and the emulsification stability was excellent, making it suitable for aerial spraying operations using high-concentration pesticide formulations.
[0032] A conventional phosphate ester type pesticide emulsifier, by mass parts, comprises the following components: 50 parts of isomeric alcohol polyoxyethylene ether phosphate, 28 parts of common nonionic surfactant (50% narrowing rate), and 10 parts of propylene glycol methyl ether acetate, without the addition of an anti-drift modifier, and prepared by the same method as in Example 2.
[0033] Performance testing: At the concentration used for aerial spraying, no visible precipitate was observed after standing for 1 hour, slight precipitate appeared after standing for 4 hours, and obvious stratification was observed after standing for 24 hours; precipitates appeared after standing at 0℃ for 72 hours; the biodegradation rate was 75%; the surface tension was 35 mN / m, resulting in severe droplet drift; the amount of foam was excessive, which easily clogged the nozzles and could not meet the requirements for aerial spraying operations.
[0034] A conventional phosphate ester type pesticide emulsifier, by mass parts, comprises the following components: 50 parts of ordinary fatty alcohol polyoxyethylene ether phosphate, 28 parts of fatty acid polyoxyethylene alkyl ether, 10 parts of ethylene glycol ethyl ether, and 5 parts of organosilicon modified polyether. The preparation method is the same as in Example 2.
[0035] Performance testing: At the concentration used for aerial spraying, this emulsifier showed slight precipitation after standing for 1 hour, stratification after 4 hours, and significant precipitation after 24 hours; severe stratification after standing at 0℃ for 72 hours; biodegradation rate of 70%; surface tension of 30 mN / m, with average anti-drift performance; poor emulsification stability, making it unsuitable for high dilution ratios required for aerial spraying.
[0036] The performance comparison between Examples 1-3 and Comparative Examples 1-2 shows that the present invention, through specific component ratios and preparation processes, makes the emulsifier's emulsification stability, anti-drift properties, low-temperature stability, biodegradability, and other properties significantly superior to conventional phosphate ester pesticide emulsifiers. It is fully adapted to the core requirements of aerial spraying operations and has significant technical advantages and practical value. Attached Figure Description
[0037] Figure 1 Comparison of emulsification stability of the emulsifier of this invention and conventional emulsifier at aerial spray dilution concentrations; Figure 2 : Flowchart of the preparation process of the emulsifier of this invention; Figure 3 Comparison of the anti-drift properties of the emulsifier of this invention and conventional emulsifiers. Detailed Implementation
[0038] The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this invention. Without departing from the principles of this invention, those skilled in the art can make appropriate adjustments and modifications to the component ratios, reaction conditions, etc., of this invention, and all such adjustments and modifications should fall within the scope of protection of this invention.
[0039] The emulsifier described in this invention can be compounded with various pesticide technicals to prepare formulations such as emulsifiable concentrates, water-in-oil emulsions, and microemulsions for use in drone aerial spraying operations. It is suitable for the prevention and control of pests and diseases in various field crops such as rice, wheat, corn, and cotton, as well as economic crops such as fruit trees and vegetables. When using it, it can be diluted according to the conventional dilution ratio for aerial spraying and then sprayed by atomization. The operation is simple and the efficacy is significant.
Claims
1. A phosphate ester-based pesticide emulsifier suitable for aerial spraying, characterized in that, The product comprises, by weight parts, the following components: 40-60 parts of isomeric alcohol polyoxyethylene ether phosphate, 20-35 parts of nonionic surfactant, 5-15 parts of co-emulsifier, and 2-8 parts of anti-drift modifier; the structural formula of the isomeric alcohol polyoxyethylene ether phosphate is R1O—(C2H4O). n —PO(OH)2, where R1 is C 10 Or C 13 The isomeric alkyl group, where n is the average molar number of EO additions, ranging from 5 to 10; the anti-drift modifier is an organosilicon-modified polyether with a cloud point of 60-80℃ and a surface tension ≤28mN / m.
2. The phosphate ester-type pesticide emulsifier suitable for aerial spraying according to claim 1, characterized in that, The optimal proportions of each component by mass are: 50 parts of isomeric alcohol polyoxyethylene ether phosphate, 28 parts of nonionic surfactant, 10 parts of co-emulsifier, and 5 parts of anti-drift modifier.
3. The phosphate ester-type pesticide emulsifier suitable for aerial spraying according to claim 1, characterized in that, The nonionic surfactant is a fatty acid polyoxyalkylene ether with a narrowing rate ≥55% by mass and the structural formula R2CO(EO). m (PO) k OR3, where R2CO is a saturated or unsaturated fatty acid residue with 14-22 carbon atoms, R3 is an alkyl group with 1-3 carbon atoms, m is an integer from 2 to 10, k is an integer from 1 to 4, and the addition of EO to PO is a block polymerization.
4. The phosphate ester-type pesticide emulsifier suitable for aerial spraying according to claim 1, characterized in that, The co-emulsifier is one or a mixture of two of propylene glycol methyl ether acetate and ethylene glycol ethyl ether in any proportion; in the isomeric alcohol polyoxyethylene ether phosphate, the molar ratio of monoester to diester is 50:45 to 60:
35.
5. The phosphate ester-type pesticide emulsifier suitable for aerial spraying according to claim 1, characterized in that, The performance indicators of this emulsifier meet the following requirements: at the commonly used dilution concentration for aerial spraying, no visible precipitation after standing for 1 hour, no precipitation after standing for 4 hours and after inversion, no precipitation after standing for 24 hours and after standing for 0.5 hours; no precipitation or stratification after standing for 72 hours at a low temperature of 0℃, and a biodegradation rate of ≥80%.
6. A method for preparing a phosphate ester-type pesticide emulsifier suitable for aerial spraying as described in any one of claims 1-5, characterized in that, Includes the following steps: (1) Esterification reaction: The isomeric alcohol polyoxyethylene ether is added to the reaction vessel, stirred and heated to 45-55℃, and phosphorus pentoxide is added dropwise at a uniform rate. During the dropwise addition, the temperature of the reaction system is controlled not to exceed 60℃. After the dropwise addition is completed, the temperature is raised to 70-80℃ and the reaction is kept at this temperature for 3-5 hours to obtain crude isomeric alcohol polyoxyethylene ether phosphate; the molar ratio of the isomeric alcohol polyoxyethylene ether to phosphorus pentoxide is 3.2:1~5.6:1; (2) Neutralization reaction: Cool the crude product obtained in step (1) to 40-50℃, slowly add triethanolamine for neutralization, adjust the pH of the system to 6.5-7.5, stir the reaction for 1h, and obtain the neutralized product; the molar amount of the triethanolamine is 4-6 times the molar amount of phosphorus pentoxide used in step (1); (3) Compound modification: Add nonionic surfactant and co-emulsifier to the neutralized product obtained in step (2) in sequence, stir and mix for 30-60 min at 50-60℃ and 100-200 rpm, then add anti-drift modifier and continue stirring for 20-40 min to obtain a mixed system; (4) Post-treatment: Cool the mixture obtained in step (3) to room temperature, and filter it through a 1μm PP membrane and a 300-mesh stainless steel filter in sequence to remove impurities and obtain a phosphate ester pesticide emulsifier suitable for aerial spraying.
7. The preparation method according to claim 6, characterized in that, In step (1), the dropping rate of phosphorus pentoxide is 2 s / drop. Powdered phosphorus pentoxide is used, and the temperature of the reaction system is controlled to be below 40℃ during feeding.
8. The preparation method according to claim 6, characterized in that, In step (3), the order of adding nonionic surfactant and co-emulsifier can be interchanged. During stirring, 0.1-0.5 parts of 50% hypophosphoric acid solution can be added as a stabilizer, and 0.1-0.5 parts of 35% hydrogen peroxide solution can be added as a decolorizing agent.
9. The preparation method according to claim 6, characterized in that, In step (4), after filtration, 0.1-2 parts of deionized water can be added as needed to adjust the viscosity of the system, so that the emulsifier is more suitable for the atomization requirements of the flight protection.