CN109452268B - Surfactant for improving pesticide droplet dispersion interface performance and preparation method thereof - Google Patents
Surfactant for improving pesticide droplet dispersion interface performance and preparation method thereof Download PDFInfo
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- CN109452268B CN109452268B CN201811400376.6A CN201811400376A CN109452268B CN 109452268 B CN109452268 B CN 109452268B CN 201811400376 A CN201811400376 A CN 201811400376A CN 109452268 B CN109452268 B CN 109452268B
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
- A01N25/04—Dispersions, emulsions, suspoemulsions, suspension concentrates or gels
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/30—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests characterised by the surfactants
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Abstract
The invention discloses a surfactant for improving the dispersion interface performance of pesticide droplets, which is added into an aqueous spray solution or a mixture to improve the droplet interface performance of a pesticide preparation; meanwhile, the invention also discloses a preparation method of the surfactant for improving the dispersion interface performance of the pesticide droplets, which has the advantages of simple preparation process, high raw material conversion rate and high production efficiency and is convenient for industrial popularization and application.
Description
Technical Field
The invention relates to the technical field of pesticide auxiliaries, in particular to a surfactant for improving the dispersion interface performance of pesticide droplets and a preparation method thereof.
Background
The pesticide is an essential important production data in modern agricultural production, and the problem of low effective utilization rate exists in the using process. Particularly, in the spraying process, a great amount of fog drops formed by pesticide liquid are lost to the environment, so that the effective utilization rate of the pesticide is low; and the pesticide liquid is dropped on the surface of the target to easily cause bounce and roll-off, so that most of the pesticide active ingredients are lost, and further environmental pollution and resource waste are caused. The pesticide synergistic auxiliary agent is a general name of the auxiliary agent used in spraying method pesticide application or similar application technologies, and by properly adding the pesticide synergistic auxiliary agent, the viscosity, deposition amount, wetting and spreading performance of pesticide droplets on the surface of a target can be obviously improved, the volume particle size of fog droplets can be increased, the atomization state during spraying can be effectively controlled, the drifting and flying of liquid medicine can be reduced, the evaporation effect can be effectively inhibited, the effective utilization rate of pesticide can be improved, and the purpose of reducing the pesticide can be achieved.
However, the pesticide synergistic additive adopted in the prior art has obvious defects: for example, CN107251895A discloses a spraying aid and preparation and application thereof, the spraying aid has higher solubility and stability for most of the existing pesticides and leaf fertilizers sold in the market, and can improve the evaporation resistance and drift resistance of fog drops, but the spraying aid uses alkylphenol polyoxyethylene ether, and the nonylphenol polyoxyethylene ether is one of the alkylphenol polyoxyethylene ether, has harm to male reproductive systems and is gradually brought into forbidden lists, so the spraying aid can have potential harm to human bodies; CN106165681A discloses an agricultural adjuvant special for airplane spraying, which has excellent evaporation inhibition effect and sedimentation effect, but uses a novel structure high molecular polymer ND-100, and ND-100 is 100% hyperbranched C8-18 fatty alcohol ethylene oxide propylene oxide block polymer, so that the production cost is high, and the industrial production is not easy to carry out; US20100113275a1 discloses a method of controlling spray drift of pesticides with self-emulsifying esters by incorporating self-emulsifying esters in the liquid to be sprayed to reduce spray drift during agrochemical application, but the use is complicated and limited in application and distribution.
Therefore, it is an urgent need to solve the problems of the art to provide a surfactant with simple preparation process, convenient use process and high safety and a preparation method thereof.
Disclosure of Invention
In view of the above, the invention provides the surfactant for improving the dispersion interfacial properties of the pesticide droplets and the preparation method thereof, the preparation process is simple, the raw material conversion rate is high, the overall production efficiency is high, and the surfactant prepared by the method can be added into an aqueous spray solution or a mixture to improve the droplet interfacial properties of a pesticide preparation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a surfactant for improving the dispersing interface performance of pesticide fog drops is characterized in that the chemical structural formula of the surfactant comprises
；
The R is1Includes H, CH3Or CH2CH3Said R is2Includes H, CH3Or CH2CH3Said R is3Includes H, CH3Or CH2CH3Said n1 comprises an integer from 0 to 50, said n2 comprises an integer from 0 to 50, said n3 comprises an integer from 0 to 50, the sum of said n1, n2 and n3 is an integer greater than 0, and said Z comprises a fatty acid residue.
The beneficial effects of the preferred technical scheme are as follows: the surfactants disclosed herein are alkoxylated modified in the polyvinylamine backbone by replacing a hydrogen atom on the nitrogen atom with a polyalkyleneoxy chain having from about 1 to about 50 alkoxy moieties, the terminal alkoxy moieties in the alkoxylation being terminated with hydrogen, a fatty acid residue, or a mixture thereof. Therefore, the cationic surfactant has the characteristics of a cationic surfactant, is beneficial to improving the deposition amount of the liquid medicine on a target and reducing the loss of the liquid medicine; the alkoxylated chain is contained, so that the compatibility of different substances among preparations is improved, and the physical stability among mixed liquid medicines can be improved; meanwhile, the oil-soluble fatty acid is contained, so that the evaporation amount of the fog drops is reduced, and the utilization rate of the effective components of the pesticide can be improved; and the interfacial tension of the fog drops can be increased, so that the grain diameter and the uniformity of the fog drops are increased, the drift of the fog drops can be reduced, and the resource waste and the environmental pollution can be reduced.
The preparation method of the surfactant for improving the dispersion interface performance of the pesticide droplets is characterized by comprising the following steps:
(1) adding an epoxy compound into the aqueous solution of the polyvinylamine A, and carrying out curing reaction to obtain an aqueous solution of a polyvinylamine alkoxide compound B;
(2) adding a catalyst into the aqueous solution of the polyvinylamine alkoxy compound B, then adding an epoxy compound for curing reaction, and then adding a neutralizing agent for regulating the pH value to prepare a polyvinylamine alkyl compound C;
(3) the surface active agent for improving the dispersion interface performance of pesticide droplets can be obtained by carrying out esterification reaction on a polyvinylamine alkyl compound C and fatty acid under the action of a catalyst.
The beneficial effects of the preferred technical scheme are as follows: in the preparation method of the surfactant disclosed by the invention, the regularity of the obtained molecular structure is better, and the generation of byproducts can be reduced. Firstly, the polyvinylamine and the epoxy compound directly undergo alkoxylation reaction, so that the reaction process is prevented from being influenced by the early introduction of a catalyst; the R-OH compound is obtained after the first-step alkoxylation reaction, and then the catalyst is added, so that the long-chain macromolecular alkoxy compound can be produced, the whole process is simple, and the yield is high.
Preferably, the step (1) specifically comprises the following steps:
(a) firstly, adding a polyvinylamine A aqueous solution into a reaction kettle, then replacing air in the reaction kettle with nitrogen, and raising the temperature to 80-90 ℃;
(b) then introducing an epoxy compound, introducing nitrogen, controlling the pressure to be 0.15-0.35MPa, controlling the temperature to be 80-90 ℃, and carrying out curing reaction for 1-3h until the pressure balance reaction is finished;
(c) finally, the volatile components are removed by vacuum pumping under the condition of 80-85 ℃, and the aqueous solution of the polyvinylamine alkoxide compound B can be obtained.
The beneficial effects of the preferred technical scheme are as follows: according to the invention, nitrogen is firstly introduced to replace air in the reaction kettle, so that on one hand, the danger of combustion or explosion of flammable and explosive epoxy compounds can be avoided, and on the other hand, the polyether chain is prevented from being broken due to residual air, thereby avoiding the generation of small molecular substances. The anionic polymerization of the alkoxy compound can be initiated by raising the temperature to 80-90 ℃. And then, the pressure inside and outside the reaction kettle is balanced by using nitrogen for maintaining the pressure, so that the influence on the product quality caused by the entering of air when the reaction kettle leaks air can be avoided.
Preferably, the structural formula of the polyvinylamine A in the step (1) is shown in the specification
The n comprises an integer of 2-150, and the mass percent of the polyvinylamine A in the polyvinylamine A aqueous solution is 50%.
Preferably, n includes an integer of 2 to 30.
Preferably, the epoxy compound in step (1) comprises ethylene oxide.
Preferably, the polyvinylamine alkoxide compound B has at least one alkoxy modification per nitrogen atom.
Preferably, the step (2) specifically comprises the following steps:
(A) firstly, adding the aqueous solution of the polyvinylamine alkoxy compound B obtained in the step (1) and a catalyst into a reaction kettle, replacing air in the reaction kettle with nitrogen, simultaneously heating to 100-class 135 ℃, and removing water to ensure that the water content of the material in the reaction kettle is less than 0.05%;
(B) then the temperature is raised to 100-160 ℃; controlling the feeding temperature at 100-;
(C) introducing nitrogen until the curing pressure is 0.02MPa to keep the pressure at 0.15-0.25MPa until the pressure in the reaction kettle is unchanged, and finishing the reaction; finally, vacuumizing for 0.5-1h at the temperature of 120-135 ℃, then cooling to 70-80 ℃, and adding a neutralizing agent to adjust the pH to 5-7 to obtain the polyvinylamine alkoxy compound C.
Preferably, the epoxy compound comprises ethylene oxide, propylene oxide or butylene oxide.
The beneficial effects of the preferred technical scheme are as follows: the invention thoroughly replaces the air in the reaction kettle and the material by using nitrogen, thereby avoiding danger and reducing byproduct production; the dehydration treatment can remove water in the materials, so that active hydrogen in the water is prevented from influencing the reaction of alkoxy compounds, and the increase of by-products in the product is avoided; the invention controls the feeding temperature to be lower, and can avoid the phenomenon that the reaction rate is too high due to the overhigh concentration of the catalyst in the initial material; the reaction rate can be ensured along with the temperature rise of the reaction; the pressure is controlled within a controllable range, so that the safety production can be ensured.
Preferably, the catalyst in step (a) comprises one or more of metal potassium, metal sodium, potassium methoxide, sodium methoxide, potassium hydroxide, sodium hydroxide, bimetallic compounds or zinc acetate, and the ratio of the catalyst to the total mass of the epoxy compound is 0.0005-0.8: 100.
preferably, the structural formula of the polyvinylamine alkoxy compound C comprises
The R is1Includes H, CH3Or CH2CH3Said R is2Includes H, CH3Or CH2CH3Said R is3Includes H, CH3Or CH2CH3The n1 includes an integer of 0-50, the n2 includes an integer of 0-50, and the n3 includes an integer of 0-50.
Preferably, the step (3) is specifically:
firstly, adding a polyvinylamine alkoxy compound C and fatty acid into a container, and simultaneously adding a catalyst; then heating to 145-195 ℃ for esterification reaction for 2-10h, and simultaneously blowing nitrogen for dehydration to obtain the water-soluble high-molecular comb polymer D when the acid ester is less than 4.0mgKOH/g and the conversion rate is more than 97%.
Preferably, the fatty acid in step (3) comprises one or more of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, arachidic acid, behenic acid, lignoceric acid, myristoleic acid, palmitoleic acid, hexadecenoic acid, oleic acid, elaidic acid, vaccenic acid, linoleic acid, elaidic acid, arachidonic acid, eicosapentaenoic acid, erucic acid or docosahexaenoic acid.
The beneficial effects of the preferred technical scheme are as follows: the fatty acid adopted by the invention has bactericidal property, the fatty acid is anti-evaporation, and the molecular structure of the fatty acid has affinity with the surface wax layer of the plant target, so that the fatty acid is easy to dissolve and permeate into the plant body.
Preferably, the fatty acid comprises a mixture of one or more of lauric acid, isostearic acid, stearic acid, oleic acid or linoleic acid.
The beneficial effects of the preferred technical scheme are as follows: the fatty acid adopted by the invention has the advantages of renewability, wide source and easy biodegradation; the plant foliar fertilizer has better affinity with the surface layer of the plant foliar, so that the HLB value of the product can be better adjusted; better reaction activity.
Preferably, the catalyst in the step (3) comprises sulfuric acid, p-toluenesulfonic acid, sulfamic acid or methanesulfonic acid, and the addition amount of the catalyst is 0.3% -1.5% of the total mass of the polyether and the fatty acid.
The beneficial effects of the preferred technical scheme are as follows: the catalyst adopted by the invention can enable fatty acid to react with polyether better; and the target product with better regularity can be obtained under the dosage disclosed by the invention.
According to the technical scheme, compared with the prior art, the invention discloses the surfactant for improving the dispersion interface performance of pesticide droplets and the preparation method thereof, and the surfactant has the following beneficial effects:
(1) the surfactant disclosed by the invention has the characteristic of a cationic surfactant, and is beneficial to improving the deposition amount of the liquid medicine on a target and reducing the loss of the liquid medicine;
(2) the surfactant disclosed by the invention contains an alkoxylated chain, so that the compatibility among preparations can be improved, and the physical stability among mixed liquid medicines can be improved;
(3) in addition, the surfactant disclosed by the invention contains oil-soluble fatty acid, so that the evaporation amount of fog drops can be reduced, and the utilization rate of active ingredients of the pesticide can be improved; meanwhile, the interfacial tension of the fog drops can be increased, so that the grain diameter and the uniformity of the fog drops are increased, the drift of the fog drops can be reduced, and the resource waste and the environmental pollution can be reduced;
(4) meanwhile, the preparation method disclosed by the invention is simple in preparation process, high in raw material conversion rate and high in production efficiency, and is convenient for industrial popularization and application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a preparation method of a surfactant for improving the dispersion interface performance of pesticide droplets, which specifically comprises the following steps:
(1) preparation of an aqueous solution of a polyvinylamine alkoxide B
(a) Firstly, adding a polyvinylamine A aqueous solution into a reaction kettle, then replacing air in the reaction kettle with nitrogen for 3 times, and raising the temperature to 80-90 ℃;
(b) then introducing an epoxy compound, introducing nitrogen, controlling the pressure to be 0.15-0.35MPa, controlling the temperature to be 80-90 ℃, and carrying out curing reaction for 1-3h until the pressure balance reaction is finished;
(c) finally, the volatile components are removed by vacuum pumping under the condition of 80-85 ℃, and the aqueous solution of the polyvinylamine alkoxide compound B can be obtained.
(2) Preparation of polyvinylamine alkoxylates C
(A) Firstly, adding the aqueous solution of the polyvinylamine alkoxy compound B obtained in the step (1) and a catalyst into a reaction kettle, replacing air in the reaction kettle with nitrogen, simultaneously heating to 100-class 135 ℃, and removing water to ensure that the water content of the material in the reaction kettle is less than 0.05%;
(B) then heating to 100-;
(C) introducing nitrogen until the curing pressure is 0.02MPa to keep the pressure at 0.15-0.25MPa until the pressure in the reaction kettle is unchanged, and finishing the reaction; finally, vacuumizing for 0.5-1h at the temperature of 120-135 ℃, then cooling to 70-80 ℃, and adding a neutralizing agent to adjust the pH to 5-7 to obtain the polyvinylamine alkoxy compound C.
(3) Firstly, adding a polyvinylamine alkoxy compound C and fatty acid into a container, and simultaneously adding a catalyst; and then heating to 145-195 ℃ for esterification reaction for 2-10h, and simultaneously blowing nitrogen for dehydration to obtain a water-soluble high-molecular comb polymer D when the acid ester is less than 4.0mgKOH/g and the conversion rate is more than 97%, wherein the water-soluble high-molecular comb polymer D is the surfactant for improving the dispersion interface performance of the pesticide droplets.
In order to further optimize the technical scheme, the structural formula of the polyvinylamine A in the step (1) is shown as
The n comprises an integer of 2-150, and the mass percent of the polyvinylamine A in the polyvinylamine A aqueous solution is 50%.
In order to further optimize the technical scheme, the n comprises an integer of 2-30.
In order to further optimize the technical scheme, the epoxy compound in the step (1) comprises ethylene oxide.
In order to further optimize the technical scheme, at least one alkoxy modification exists on each nitrogen atom in the polyvinylamine alkoxy compound B.
In order to further optimize the technical scheme, the catalyst in the step (A) comprises one or more of metal potassium, metal sodium, potassium methoxide, sodium methoxide, potassium hydroxide, sodium hydroxide, bimetal or zinc acetate, and the ratio of the total mass of the catalyst to the total mass of the epoxy compound is 0.0005-0.8: 100.
in order to further optimize the technical scheme, the structural formula of the polyvinylamine alkoxy compound C comprises
R1Includes H, CH3Or CH2CH3，R2Includes H, CH3Or CH2CH3，R3Includes H, CH3Or CH2CH3N1 includes an integer from 0 to 50, n2 includes an integer from 0 to 50, and n3 includes an integer from 0 to 50.
In order to further optimize the technical scheme, the fatty acid in the step (3) comprises one or more of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, arachidic acid, behenic acid, lignoceric acid, myristoleic acid, palmitoleic acid, hexadecenoic acid, oleic acid, elaidic acid, vaccenic acid, linoleic acid, elaidic acid, arachidonic acid, eicosapentaenoic acid, erucic acid or docosahexaenoic acid.
In order to further optimize the technical scheme, the fatty acid comprises one or more of lauric acid, isostearic acid, stearic acid, oleic acid or linoleic acid.
In order to further optimize the technical scheme, the catalyst in the step (3) comprises sulfuric acid, p-toluenesulfonic acid, sulfamic acid or methanesulfonic acid, and the addition amount of the catalyst is 0.3% -1.5% of the total mass of the polyether and the fatty acid.
The invention also discloses a surfactant for improving the dispersion interface performance of pesticide droplets, and the chemical structural formula of the surfactant comprises
R1 includes H, CH3 or CH2CH3, R2 includes H, CH3 or CH2CH3, R3 includes H, CH3 or CH2CH3, n1 includes an integer from 0 to 50, n2 includes an integer from 0 to 50, n3 includes an integer from 0 to 50, and Z includes a fatty acid residue.
Example 1
The embodiment of the invention discloses a preparation method of a surfactant for improving the dispersion interface performance of pesticide droplets, which specifically comprises the following steps
(1) Adding 200g of a 50% polyvinyl amine aqueous solution with n being 4 into a 2L reaction kettle, replacing the solution with nitrogen for 3 times, raising the temperature to 80-90 ℃, introducing 205gEO, introducing nitrogen to ensure that the pressure is 0.15-0.35MPa, curing the solution for 1-3h at 80-90 ℃, and finishing the reaction after the pressure is kept constant. And (3) vacuumizing at 80-85 ℃ to remove volatile components to obtain 65% of polyvinylamine alkoxy compound 1B aqueous solution.
(2) Adding 200g of the aqueous solution of the polyvinylamine alkoxy compound B obtained in the step (1) and 1.76g of NaOH into another 2L reaction kettle, replacing the mixture with nitrogen for three times, heating to 100-160 ℃, removing water within a certain time to ensure that the water content of the materials in the 2L reaction kettle is less than 0.05 percent, heating to 100-160 ℃, introducing 458gEO, controlling the feeding temperature to 100-160 ℃, and controlling the maximum feeding pressure to be less than 0.35 MPa; and (5) finishing feeding. Curing at the temperature of between 120 and 160 ℃, and introducing nitrogen to keep the pressure at 0.15-0.25MPa when the curing pressure is close to 0.02 MPa. When the pressure in the reaction kettle is kept unchanged, the reaction is finished; the curing time is about 1-3 h. Vacuumizing at 135 ℃ of 120 ℃ for 0.5-1h, cooling to 70-80 ℃, adding a neutralizing agent, and adjusting the pH value to 5-7. Obtaining a product with a hydroxyl value of 190 mgKOH/g; labeled 1C.
(3) 200g of 1C, 180g of oleic acid and 1.2g of methanesulfonic acid are added into a four-neck flask, the temperature is increased to 145-195 ℃, nitrogen is slightly blown for dehydration, esterification reaction is carried out, when the acid value is 2.1mgKOH/g, the esterification time is 6.5h, the conversion rate is 97.7 percent, and a product is obtained and is marked as 1D.
Example 2
The embodiment of the invention discloses a preparation method of a surfactant for improving the dispersion interface performance of pesticide droplets, which specifically comprises the following steps:
(1) adding 300g of 50% polyvinylamine aqueous solution with n being 10 into a 2L reaction kettle, replacing 3 times by nitrogen, raising the temperature to 80-90 ℃, introducing 614gEO, introducing nitrogen to ensure that the pressure is 0.15-0.35MPa, curing for 1-3h at 80-90 ℃, and finishing the reaction after the pressure is kept constant. And vacuumizing at 80-85 ℃ to remove volatile components to obtain 68% of polyvinylamine alkoxide compound 2B aqueous solution.
(2) Adding 200g of the aqueous solution of the polyvinylamine alkoxy compound B obtained in the step (1) and 2.2g of KOH into another 2L reaction kettle, replacing the mixture with nitrogen for three times, heating to the temperature of 100-; and (5) finishing feeding. Curing at the temperature of between 120 and 160 ℃, and introducing nitrogen to keep the pressure at 0.15-0.25MPa when the curing pressure is close to 0.02 MPa. When the pressure in the reaction kettle is kept unchanged, the reaction is finished; the curing time is about 1-3 h. Vacuum pumping is carried out for 0.5-1h at the temperature of 120 ℃ and 135 ℃. Then heating to 100 ℃ and 160 ℃, introducing 86gEO, controlling the feeding temperature at 100 ℃ and 160 ℃, and controlling the maximum feeding pressure to be less than 0.35 MPa; and (5) finishing feeding. Curing at the temperature of between 120 and 160 ℃, and introducing nitrogen to keep the pressure at 0.15-0.25MPa when the curing pressure is close to 0.02 MPa. When the pressure in the reaction kettle is kept unchanged, the reaction is finished; the curing time is about 1-3 h. Vacuumizing at the temperature of 120 ℃ and 135 ℃ for 0.5-1h, cooling to 70-80 ℃, adding a neutralizing agent, and adjusting the pH to 5-7. Obtaining a product with a hydroxyl value of 78 mgKOH/g; labeled 2C.
(3) 200g of 2C, 41g of lauric acid and 1.8g of sulfamic acid are added into a four-neck flask, the temperature is raised to 145-195 ℃, nitrogen is slightly blown for dehydration, esterification reaction is carried out, when the acid value is 1.2mgKOH/g, the esterification time is 8.5h, the conversion rate is 97.5 percent, and a bright yellow viscous and transparent water-soluble product is obtained and is marked as 2D.
Example 3
The embodiment of the invention discloses a preparation method of a surfactant for improving the dispersion interface performance of pesticide droplets, which specifically comprises the following steps:
(1) adding 400g of a 50% polyvinyl amine aqueous solution with n of 30 into a 2L reaction kettle, replacing the solution with nitrogen for 3 times, raising the temperature to 80-90 ℃, introducing 409gEO, introducing nitrogen to ensure that the pressure is 0.15-0.35MPa, curing the solution at 80-90 ℃ for 1-3h, and finishing the reaction after the pressure is kept constant. Vacuumizing at 80-85 deg.C to remove volatile components to obtain 66% aqueous solution of polyvinylamine alkoxide compound 3B.
(2) Into another 2L reactor were charged 200g of the aqueous solution of the polyvinylamine alkoxide B obtained in step (1) and 2.9gCH3KO, replacing with nitrogen for three times again, heating to the temperature of 100-; and (5) finishing feeding. Curing at the temperature of between 120 and 160 ℃, and introducing nitrogen to keep the pressure at 0.15-0.25MPa when the curing pressure is close to 0.02 MPa. When the pressure in the reaction kettle is kept unchanged, the reaction is finished; the curing time is about 1-3 h. Vacuum pumping is carried out for 0.5-1h at the temperature of 120 ℃ and 135 ℃. Then the temperature is increased to 100 ℃ and 160 ℃, 266gEO is introduced, the feeding temperature is controlled at 100 ℃ and 160 ℃, and the maximum feeding pressure is less than 0.35 MPa; and (5) finishing feeding. Curing at the temperature of between 120 and 160 ℃, and introducing nitrogen to keep the pressure at 0.15-0.25MPa when the curing pressure is close to 0.02 MPa. When the pressure in the reaction kettle is kept unchanged, the reaction is finished; the curing time is about 1-3 h. Vacuumizing at the temperature of 120 ℃ and 135 ℃ for 0.5-1h, cooling to 70-80 ℃, adding a neutralizing agent, and adjusting the pH to 5-7. Obtaining a product with a hydroxyl value of 116 mgKOH/g; labeled 3C.
(3) 300g of 2C, 138 linoleic acid and 4.3g of p-toluenesulfonic acid are added into a four-neck flask, the temperature is raised to 145-195 ℃, nitrogen is slightly blown for dehydration, esterification reaction is carried out, when the acid value is 1.5mgKOH/g, the esterification time is 9.5h, the conversion rate is 97.6 percent, and a bright yellow viscous and transparent water-soluble product is obtained and is marked as 3D.
Example 4
The embodiment of the invention discloses a preparation method of a surfactant for improving the dispersion interface performance of pesticide droplets, which specifically comprises the following steps:
(1) adding 400g of 50% polyvinylamine aqueous solution with n being 20 into a 2L reaction kettle, replacing 3 times by nitrogen, raising the temperature to 80-90 ℃, introducing 204.6gEO, introducing nitrogen to ensure that the pressure is 0.15-0.35MPa, curing for 1-3h at 80-90 ℃, and finishing the reaction after the pressure is kept constant. Vacuumizing at 80-85 deg.C to remove volatile components to obtain 69% aqueous solution of polyvinylamine alkoxide 4B.
(2) Adding 200g of the aqueous solution of the polyvinylamine alkoxy compound B obtained in the step (1) and 4.6gCH ONa into another 2L reaction kettle, replacing the mixture with nitrogen for three times, heating to 135 ℃ for 100-; and (5) finishing feeding. Curing at the temperature of between 120 and 160 ℃, and introducing nitrogen to keep the pressure at 0.15-0.25MPa when the curing pressure is close to 0.02 MPa. When the pressure in the reaction kettle is kept unchanged, the reaction is finished; the curing time is about 1-3 h. Vacuum pumping is carried out for 0.5-1h at the temperature of 120 ℃ and 135 ℃. Then the temperature is raised to 100-160 ℃, 488gEO is introduced, the feeding temperature is controlled at 100-160 ℃, and the maximum feeding pressure is less than 0.35 MPa; and (5) finishing feeding. Curing at the temperature of between 120 and 160 ℃, and introducing nitrogen to keep the pressure at 0.15-0.25MPa when the curing pressure is close to 0.02 MPa. When the pressure in the reaction kettle is kept unchanged, the reaction is finished; the curing time is about 1-3 h. Vacuumizing at the temperature of 120 ℃ and 135 ℃ for 0.5-1h, cooling to 70-80 ℃, adding a neutralizing agent, and adjusting the pH to 5-7. Obtaining a product with a hydroxyl value of 110 mgKOH/g; labeled 4C.
(2) 300g of 2C, 43g of stearic acid and 3.43g of p-toluenesulfonic acid are added into a four-neck flask, the temperature is raised to 145-195 ℃, nitrogen is slightly blown for dehydration, esterification reaction is carried out, when the acid value is 0.71mgKOH/g, the esterification time is 9.5h, the conversion rate is 97.0 percent, bright brown viscous and transparent water-soluble products are obtained, and the mark of the water-soluble products is 4D.
Experiments prove the technical effects of the surfactants prepared in the above examples 1 to 4.
Firstly, performance characterization: the contact angle, cloud point, viscosity and equilibrium tension of inventive examples 1 to 4 and a commercially available nitrogen-containing auxiliary agent E were measured, respectively.
1. Contact angle
The auxiliary agents prepared in examples 1 to 4 and the commercially available nitrogen-containing auxiliary agent E were diluted to 0.2% by mass of an auxiliary agent aqueous solution, and then contact angles were measured, respectively, with the results shown in table 1 below.
2. Cloud point
The auxiliary agent prepared in examples 1 to 4 and the commercial nitrogen-containing auxiliary agent E were diluted to 1% by mass of an auxiliary agent aqueous solution, and then the cloud points were measured, respectively, and the results are shown in table 1 below.
3. Viscosity of the oil
The viscosities of the adjuvants prepared in inventive examples 1 to 4 and commercially available nitrogen-containing adjuvant E were determined using spindle bodies, and the viscosities of the pure samples were measured on a TA ARG2 rheometer from TA Instruments, with the results shown in Table 1 below.
4. Balancing surface tension
The assistant prepared in examples 1 to 4 and the commercial nitrogen-containing assistant E were diluted to 1% by mass of an assistant aqueous solution, and then measured at 25.0 ℃. + -. 0.1 ℃ by a Kruss model K10ST tensiometer equipped with a Wilhelmy plate, and the results are shown in Table 1 below.
TABLE 1
As is evident from the data in table 1 above: compared with a commercially available assistant E, the assistant prepared in the embodiments 1-4 of the invention has a lower contact angle, which is beneficial to spreading of the preparation on the target, and the lowest contact angle of 45 degrees is beneficial to retention of the preparation on the target, can avoid loss due to a smaller contact angle, and is beneficial to retention of the preparation on the target; the cloud point of the auxiliary agent prepared in the embodiments 1-4 is less than 10 ℃, a uniform and stable emulsion is easily formed in cold water, linear water-soluble cation, oiliness (hydrophobicity), hydrophilic compatible nonionic and optional anionic functionality are combined, other surfactants are not required to be added in the auxiliary agent, and the compatibility and stability among preparations are improved; the auxiliary agent prepared in the embodiments 1-4 of the invention has high viscosity and good rheological efficiency; compared with the commercially available auxiliary agent E, the auxiliary agent prepared in the embodiments 1-4 of the invention has lower equilibrium surface tension, and the spreading effect of the preparation on the target is improved.
Second, liquid medicine tank mixing stability experiment
Medicament: 20% of dinotefuran suspending agent, 350g/L of imidacloprid suspending agent, 10% of quizalofop-p-ethyl emulsion in water, 11% of abamectin and etoxazole suspending agent, 50% of thiophanate-methyl wettable powder and 10% of cyhalofop-butyl emulsifiable concentrate;
the test method comprises the following steps: diluting the synthesized auxiliary agent, the commercially available auxiliary agent E, ND-100 and MSD-40 respectively according to the dilution times shown in Table 2, and mixing with the medicinal preparation to obtain a tank-mixed liquid medicine; the tank-mixed liquid medicine is placed in a measuring cylinder with a tip bottom and a plug of 100ml, and is kept still for 1h to observe whether the phenomenon of floating cream precipitation exists, the phenomenon without floating cream precipitation is recorded as qualified, otherwise, the phenomenon is unqualified, and the results are shown in the following table 2.
TABLE 2
As is evident from the data in table 2: the auxiliary agent prepared in the embodiments 1-5 of the invention has good compatibility with 20% dinotefuran suspending agent, 350g/L imidacloprid suspending agent, 10% quizalofop-p-ethyl emulsion in water, 11% abamectin and etoxazole suspending agent and 10% cyhalofop-butyl emulsifiable concentrate, and the varieties of other 3 types of commercially available auxiliary agents with qualified barrel mixing stability are less than the auxiliary agent synthesized by the invention.
Third, evaporation inhibition experiment
Medicament: 20% dinotefuran suspending agent
The test method comprises the following steps: the synthesized adjuvant and commercial adjuvant E were diluted at 1500X and the drug was diluted at 200X. The two-stage dilution method includes preparing 150 times of adjuvant diluent, preparing 20 times of medicament diluent, mixing the two solutions after fully stirring to obtain a mixed solution, adding 9 times of clear water, and stirring uniformly. Then, a piece of glass slide is placed on a ten-thousandth balance, after zero setting, 50 μ l of diluent is dropped on the glass slide, and the mass of the initial diluent is recorded. Then recording the mass of the diluent at different times in 10 min, 20min and 40min respectively, calculating the evaporation rate of the diluent at different times, and carrying out an evaporation test in a constant temperature and humidity laboratory under the laboratory conditions: 25.0 +/-0.1 ℃ and relative humidity of 45 percent. The results are shown in table 3 below.
Calculating the formula: the evaporation rate (%) (initial mass of diluent-mass of diluent at different times)/initial mass of diluent × 100%.
TABLE 3
As is apparent from the above experimental results in table 3: the auxiliary agent prepared in the embodiments 1-4 of the invention can obviously improve the evaporation resistance of the liquid medicine, obviously reduce the evaporation rate of the liquid medicine within the same time, prolong the interaction time between the liquid medicine and the plant tissue, and can be expected to obviously improve the absorption of the liquid medicine by the plant and promote the exertion of the medicine effect.
Fourth, the influence of the synthetic auxiliary agent on the liquid medicine retention
Medicament: 350g/L imidacloprid suspending agent
The test method comprises the following steps: the auxiliary agent and commercially available auxiliary agent ND-100 prepared in examples 1 to 4 were diluted 400X, 300X and 200X, respectively, and the drug was diluted 1500X. The preparation method comprises preparing 10 × adjuvant diluent, preparing 150 × medicinal diluent, stirring, mixing with 3 times, 2 times and 1 time of clear water, and stirring. Then, get
Placing the culture dish on a ten-thousandth balance, and adoptingA hole puncher cutting about 2cm2Weighing and recording the mass of the round plant leaves, clamping the leaves with a sharp-nose forceps, dipping the prepared liquid medicine to be measured, repeatedly soaking for 10s, suspending and standing for 10s, and placing the leaves in a culture dish to weigh the mass of the liquid medicine held by the leaves. Differences in the retention of the drug solution can be found, and the results are shown in Table 4 below.
TABLE 4
As is apparent from the experimental results in table 4 above: the auxiliary agent prepared by the invention is beneficial to the increase of the retention of the preparation; the auxiliary agent 1D prepared in the example 1 has the molecular weight of about 4487, the viscosity of 230 mPas, the ND-100 molecular weight of 16000-20000 and the viscosity of 500-800Pa s, and under the same conditions, the agent solution retention of the preparation added with the auxiliary agent 1D is higher than that of the preparation added with ND-100; the preparation retention amount obtained by adding the auxiliary agent prepared by the invention is larger than that obtained by adding ND-100.
Fifth, method for analyzing spray drift of tank mixture
Medicament: 10% quizalofop-p-ethyl emulsion in water
Test method 1: the synthesized adjuvant and the commercial adjuvant MSD-40 were diluted at 500 Xand the drug was diluted at 750X. The two-time dilution method can be adopted, firstly 50 times of auxiliary agent diluent is prepared, then 75 times of medicament diluent is prepared, after the two are fully stirred, mixed liquor of the two is prepared, then 9 times of clear water is added, and the mixture is uniformly stirred. Then, on the fog drop comprehensive evaluation tester developed by engine-driven atomizer, 110-03 type fan-shaped spray head commonly used is used, spraying is carried out under the pressure of 0.3MPa, side wind of 2m/s, 3m/s and 5m/s is respectively applied, in the spraying wind tunnel, at a position 1m away from the nozzle, an isometric parallel cotton thread device with the distance of 10cm is arranged, after the spraying is suspended, the cotton threads are collected, and the content of the liquid medicine on each cotton thread is respectively measured. Calculating the formula: drift rate (%) - (content of liquid in cotton-diluent content at different test positions)/content of diluent × 100%. The amount of drift of the chemical solution was obtained, and the results are shown in Table 5 below.
TABLE 5
The test method 2: solutions were prepared as in method 1. Then, spraying is carried out on a fog droplet comprehensive and evaluation tester developed by Ongsu according to the spraying condition of the method 1. Testing the particle size data DV1, DV5 and DV9 of the spray droplets, and synchronously calculating to obtain the particle size distribution span, wherein the calculation formula is as follows: the span (DV9-DV1)/DV5, the particle size span reflects the uniformity of the particle size distribution, the closer the value is to 1, the more uniform the distribution, and the results are shown in Table 6 below
TABLE 6
As is evident from the data in table 5 above: under the simulation of the wind speed of 3m/s and the following meteorological conditions, the auxiliary agent prepared in the embodiments 1 to 4 of the invention can better inhibit the fogdrop from drifting compared with the commercially available MSD-40, can effectively reduce the drift rate of the liquid medicine, and improves the safety of herbicide application; even under the simulation of extreme meteorological conditions of 5m/s, the auxiliary agent prepared in the embodiments 1-4 of the invention can still show the performance of inhibiting the drift rate of the liquid medicine.
As is evident from the data in table 6 above: the preparation prepared by the invention can effectively increase the particle size of the fog drops, greatly reduce the number of the fog drops with small particle size which are easy to drift, simultaneously ensure that more than 90 percent of the fog drops are in the most suitable biological particle size range less than 300 mu m, and simultaneously use the auxiliary agent synthesized by the embodiment of the invention to ensure that the particle size distribution span of the barrel-mixed liquid medicine is smaller, thereby showing that the atomized particle size distribution is more uniform.
Sixthly, rain wash resistance
Medicament: 10% cyhalofop-butyl emulsifiable concentrate
The test method comprises the following steps: the synthesized adjuvant and the commercial adjuvant MSD-40 were diluted at 500 Xand the drug was diluted at 50X. The two-stage dilution method includes preparing 50 times of adjuvant diluent, preparing 5 times of medicament diluent, mixing the two solutions after fully stirring to obtain a mixed solution, adding 9 times of clear water, and stirring uniformly. Then, uniformly spraying potted Euphorbiae Lathyridis semen by using a potter spray tower, simulating rainfall for 30min, 60min and 120min respectively by using a1 mm-aperture shower head 1h after the application of the pesticide, shearing equivalent weed stems and leaves by using a 5-point sampling method after the rainfall simulation, and analyzing the pesticide residue of the weed plants by using a pesticide residue detector. The effect of the adjuvant on the rainfastness of the agent was obtained, and the results are shown in table 7 below.
TABLE 7
As is evident from the data in table 7 above: the pesticide residue of the weed plants after rainfall simulation can be obviously improved by mixing the auxiliary agent prepared in the embodiment of the invention with the agent in a tank, which shows that the auxiliary agent synthesized by the invention has the function of improving the rain erosion resistance of the agent and can effectively reduce the influence of rainfall after application on the pesticide effect.
Seven, field control experiment
(1) Control subject 1: myzus avenae; test work: wheat; medicament: 350g/L imidacloprid suspending agent;
the test method comprises the following steps: after wheat jointing, the field surveys the plots with about 1000 insect population per hundred plants to carry out the test. The synthesized adjuvant and the commercial adjuvant MSD-40 were diluted at 500 Xand the drug was diluted at 1500X. The two-stage dilution method includes preparing 50 times of adjuvant diluent, preparing 5 times of medicament diluent, mixing the two solutions after fully stirring to obtain a mixed solution, adding 9 times of clear water, and stirring uniformly. An electric knapsack sprayer with the model of 20FT, a conical nozzle, the volume of 15L and the spraying pressure of 0.25 MPa-0.4 MPa is adopted, random block plots are uniformly sprayed, an additive group and a clear water control group are arranged, and the number of insect population is respectively investigated at 1d, 3d, 7d and 14d after the pesticide is applied. The control data of whether the auxiliary has synergistic effect on the pesticide can be obtained, and the results are shown in the following table 8.
TABLE 8
(2) Control object 2: prodenia litura; test work: soybean; medicament: 20% dinotefuran suspending agent;
the test method comprises the following steps: in the middle and later growth period of soybean, the insect population is collected by a black light lamp in an investigation way, and the prevention and treatment test can be carried out at a rate of 30-50 heads/d. The synthesized adjuvant and commercial adjuvant E were diluted at 1500X, and the drug was diluted at 1500X. The two-stage dilution method includes preparing 150 times of adjuvant diluent, preparing 150 times of medicament diluent, mixing the two solutions after fully stirring to obtain a mixed solution, adding 9 times of clear water, and stirring uniformly. An electric knapsack sprayer with the model of 20FT, a conical nozzle, the volume of 15L and the spraying pressure of 0.25 MPa-0.4 MPa is adopted, random block plots are uniformly sprayed, an additive group and a clear water control group are arranged, and the number of insect population is respectively investigated at 1d, 3d, 7d and 14d after the pesticide is applied. The control effect data of whether the auxiliary has the synergistic effect on the pesticide can be obtained, and the results are shown in table 9.
TABLE 9
(3) Control object 3: tetranychus urticae; test work: muskmelon (protected land);
medicament: 11% of abamectin and etoxazole suspending agent;
the test method comprises the following steps: after the melons are fruited, the insect population is investigated for about 200 heads/leaf of land blocks to carry out the test. The synthesized auxiliary agent and the commercial auxiliary agent ND-100 are diluted according to 400 x, and the medicament is diluted according to 3000 x. The two-stage dilution method includes preparing diluent of 40 times the assistant, preparing diluent of 300 times the medicine, mixing the two after stirring to obtain mixed liquid, adding 9 times of clear water, and stirring. An electric knapsack sprayer with the model of 20FT, a conical nozzle, the volume of 15L and the spraying pressure of 0.25 MPa-0.4 MPa is adopted, random block plots are uniformly sprayed, an additive group and a clear water control group are arranged, and the number of insect population is respectively investigated at 1d, 3d, 7d and 14d after the pesticide is applied. The control effect data of whether the auxiliary has the synergistic effect on the pesticide can be obtained, and the results are shown in table 10.
Watch 10
The data in tables 8 to 10 above clearly show that: the pesticide additive prepared by the invention can be mixed with pesticide in a tank, so that the control effect of the pesticide can be obviously improved, and the synergistic effect is higher than that of three commercially available additives.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The surfactant for improving the dispersion interface performance of pesticide droplets is characterized by having a chemical structural formula
；
Or
；
The R is1Is H, CH3Or CH2CH3Said R is2Is H, CH3Or CH2CH3Said R is3Is H, CH3Or CH2CH3The n1 is selected from an integer of 0-50, the n2 is selected from an integer of 0-50, the n3 is selected from an integer of 0-50, the sum of n1, n2 and n3 is an integer greater than 0, and Z is a fatty acid residue.
2. The preparation method of the surfactant for improving the dispersion interfacial property of the pesticide droplets as claimed in claim 1, which is characterized by comprising the following steps:
(1) adding an epoxy compound into the aqueous solution of the polyvinylamine A, and carrying out curing reaction to obtain an aqueous solution of a polyvinylamine alkoxide compound B;
(2) adding a catalyst into the aqueous solution of the polyvinylamine alkoxy compound B, then adding an epoxy compound for curing reaction, and then adding a neutralizing agent for regulating the pH value to prepare a polyvinylamine alkyl compound C;
(3) the surface active agent for improving the dispersion interface performance of pesticide droplets can be obtained by carrying out esterification reaction on a polyvinylamine alkyl compound C and fatty acid under the action of a catalyst.
3. The preparation method of the surfactant for improving the dispersion interfacial property of the pesticide droplets as claimed in claim 2, wherein the step (1) specifically comprises the following steps:
(a) firstly, adding a polyvinylamine A aqueous solution into a reaction kettle, then replacing air in the reaction kettle with nitrogen, and raising the temperature to 80-90 ℃;
(b) then introducing an epoxy compound, introducing nitrogen, controlling the pressure to be 0.15-0.35MPa, controlling the temperature to be 80-90 ℃, and carrying out curing reaction for 1-3h until the pressure balance reaction is finished;
(c) finally, the volatile components are removed by vacuum pumping under the condition of 80-85 ℃, and the aqueous solution of the polyvinylamine alkoxide compound B can be obtained.
4. The preparation method of the surfactant for improving the dispersion interfacial property of the pesticide droplets as claimed in claim 3, wherein the structural formula of the polyvinylamine A in the step (1) is shown in the specification
The n is an integer from 2 to 150, and the mass percent of the polyvinylamine A in the polyvinylamine A aqueous solution is 50%.
5. The preparation method of the surfactant for improving the dispersion interfacial property of the pesticide droplets as claimed in claim 2, wherein the step (2) specifically comprises the following steps:
(A) firstly, adding the aqueous solution of the polyvinylamine alkoxy compound B obtained in the step (1) and a catalyst into a reaction kettle, replacing air in the reaction kettle with nitrogen, simultaneously heating to 100-class 135 ℃, and removing water to ensure that the water content of the material in the reaction kettle is less than 0.05%;
(B) then heating to 100-;
(C) introducing nitrogen until the curing pressure is 0.02MPa to keep the pressure at 0.15-0.25MPa until the pressure in the reaction kettle is unchanged, and finishing the reaction; finally, vacuumizing for 0.5-1h at the temperature of 120-135 ℃, then cooling to 70-80 ℃, and adding a neutralizing agent to adjust the pH to 5-7 to obtain the polyvinylamine alkoxy compound C.
6. The method for preparing the surfactant for improving the dispersion interfacial property of the pesticide droplets as claimed in claim 5, wherein the catalyst in the step (A) is one or more of metal potassium, metal sodium, potassium methoxide, sodium methoxide, potassium hydroxide, sodium hydroxide, bimetallic compounds or zinc acetate; the ratio of the catalyst to the total mass of the epoxy compound is 0.0005 to 0.8: 100.
7. the preparation method of the surfactant for improving the dispersion interfacial property of the pesticide droplets as claimed in claim 5, wherein the structural formula of the polyvinylamine alkoxy compound C is
The R is1Is H, CH3Or CH2CH3Said R is2Is H, CH3Or CH2CH3Said R is3Is H, CH3Or CH2CH3The n1 is selected from an integer of 0-50, the n2 is selected from an integer of 0-50, and the n3 is selected from an integer of 0-50.
8. The preparation method of the surfactant for improving the dispersion interfacial property of the pesticide droplets as claimed in claim 2, wherein the step (3) is specifically as follows:
firstly, adding a polyvinylamine alkoxy compound C and fatty acid into a container, and simultaneously adding a catalyst; then heating to 145-195 ℃ for esterification reaction for 2-10h, and simultaneously blowing nitrogen for dehydration to obtain the water-soluble high-molecular comb polymer D when the acid ester is less than 4.0mgKOH/g and the conversion rate is more than 97%.
9. The method for preparing the surfactant for improving the dispersion interfacial property of the pesticide droplets as claimed in claim 8, wherein the fatty acid in the step (3) is one or more of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, arachidic acid, behenic acid, lignoceric acid, myristoleic acid, palmitoleic acid, hexadecenoic acid, oleic acid, elaidic acid, vaccenic acid, linoleic acid, elaidic acid, arachidonic acid, eicosapentaenoic acid, erucic acid or docosahexaenoic acid.
10. The method for preparing the surfactant for improving the dispersion interfacial property of the pesticide droplets as claimed in claim 8, wherein the catalyst in the step (3) is sulfuric acid, p-toluenesulfonic acid, sulfamic acid or methanesulfonic acid, and the addition amount of the catalyst is 0.3% -1.5% of the total mass of the polyether and the fatty acid.
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