CN1033419C - Formulation of organophosphorus pesticide water emulsion - Google Patents

Abstract

The invention belongs to the pesticide processing technology and needs to solve the problem of formulation and technology. Water-insoluble liquid organophosphorus pesticides (fenitrothion, malathion, methyl parathion, isofenphos-methyl, Daofengsan, etc.), emulsifiers (alkylaryl polyoxyethylene polyoxypropylene ether, Alkyl aryl formaldehyde resin polyoxyethylene ether), stability (alkylphenol polyoxyethylene ether phosphate), antifreeze (ethylene glycol, polyethylene glycol, glycerin, urea) and water, prepared by homogenization process into water emulsion. This agent does not use organic solvents, has no danger of combustion and explosion, has little pesticide smell, can reduce cost and toxicity, and can be directly used for aircraft or ground micro-spray.

Description

Organophosphorus pesticide water emulsion

The invention relates to the technical field of pesticide processing preparations of water-insoluble liquid organophosphorus pesticide crude oil, which is added with emulsifier, stabilizer, antifreeze agent and water, and undergoes a homogenization process to prepare a high-concentration emulsion-in-water emulsion.

Water emulsion (water emulsion) used to be called concentrated emulsion (emulsion concentrate), which is an opaque concentrated emulsion pesticide preparation in which water-insoluble liquid pesticide crude oil is dispersed, emulsified, and suspended in an aqueous medium, and diluted with water to form an emulsion (emulsion). For the masses who lack professional knowledge of pesticides, it is easy to be confused with emulsitiable concentrate, which is a single-phase transparent solution prepared with pesticide crude oil, emulsifier, and organic solvent. It can be diluted with water to become Opaque emulsion.

Emulsion in water is a new formulation field to be developed. Emulsion in water has the advantages of emulsifiable concentrate and its cost is lower than that of emulsifiable concentrate. From the comparison of control effect and cost, it can be seen that emulsion in water has significant economic and social benefits, so it has development potential. future and vitality. Water emulsion can replace a considerable amount of emulsifiable concentrate preparations, especially the emulsifiable concentrate varieties with large tonnage in my country, and become a new type of pesticide formulation.

In 1957, Wang Junkui and other comrades of our institute studied the thick emulsion of anthracene oil. They used the by-produced sulfite pulp waste liquid concentrate (containing 46% solids) from Yingkou Paper Mill, and added anthracene oil (specific gravity 1.12, 20°C; The fraction higher than 270°C is 47%). Under stirring and grinding, the anthracene oil is dispersed into small oil droplets of 1-5 microns. With the increase of the amount of anthracene oil added, the viscosity of the whole system also gradually increases. Add appropriate water to carry out Dilute, then add anthracene oil, continue to disperse and grind, so that the viscosity increases again, add water and anthracene oil in turn, can prepare 50-60% anthracene oil thick emulsion, and the solid content of pulp waste liquid containing sulfurous acid is only 7.5-12 %. 50-100 times of liquid is used to prevent overwintering red spider eggs in fruit trees. The effect is good, but because anthracene oil is phytotoxic to crops (cotton, beans, melons), the use is limited, and it is easy to separate during storage, so it has not been put into industry. Production.

In 1958, American Stauffer Chemical Company (Stauffer Chemical Company) sold parathion concentrated emulsion commercially.

In 1963, Comrade Wang Junkui of our institute published a research report on the trial production of 25% DDT concentrated emulsion. Its formula is: DDT raw powder 25.1%, power benzene 36.0%, diesel oil 2.0%, alkaline pulp waste solids 3.0%, urea 3.0%, pull-off powder 0.05%, water 30.85%, produced in Beijing Pesticide Factory in 1962 3 tons, the preparation was centrifuged at 3200 rpm for 9 hours without stratification. Stored at 50°C for 14 days, the stability does not decrease, frozen at -23°C for 14 days, frozen at -50°C for 7 days, and then placed at room temperature, it can still return to its original shape without DDT crystallization. The cost is only two-thirds of 25% DDT emulsifiable concentrate, and the drug effect is equivalent to that of emulsifiable concentrate.

In 1974, the United States applied for a patent in Japan (Shao 49-54547), using parathion, malathion, diananon, and diphorate to make an oil-in-water emulsion. Water-insoluble organophosphorus insecticides are encapsulated in micelles with a diameter of less than 1000 angstroms (preferably less than 500 angstroms) to form an emulsion system in which the organic phase is a discontinuous phase, that is, an insoluble organic phosphorus insecticide. Phosphorus pesticide exists in the form of dissolving in micelles with a diameter of less than 1000 angstroms, forming an oil-in-water emulsion with good transparency and strong thermodynamic stability. Such as: 0.001-5% of water-insoluble organophosphorus insecticide, 0.001-20% of emulsifier, 0.001-15% of cosolvent, and the balance is water (60-99.997%).

Japanese published patent (52-122628) in 1977 is the emulsifier of oil-in-water type insecticide, is to use the condensate of formaldehyde and (I).

R ₁ =alkylphenyl, benzyl, cumyl, phenyl, styryl.

R ₂ =H or alkyl.

n+n'=6-40

Example: fenitrothion 10%, distyryl phenyl formaldehyde resin polyoxypropylene polyoxyethylene ether 50%, water 40%, the oil-in-water emulsion prepared is stable at room temperature.

In 1978, the Japanese patent (Zhao 53-13696) was a water-based insecticide, that is, a concentrated emulsion preparation of an organophosphorus insecticide, replacing an organic solvent with water, containing 5-20% of organic pesticides, 5-60% of surfactants, Stabilizer (epoxide) 0.5-3%, controls certain conditions of the preparation (pH3.5-7.5), prevents hydrolysis of active ingredients in the preparation, and makes a long-term stable new dosage form. The types of pesticides used are: fenthion, fenitrothion, diananon, malathion, diazophos, trichlorfon, chlorpyrifos, Daofengsan, dimethoate, isosulfone, phoxim, Moth eye etc. Example: 10 grams of malathion, 20 grams of tristyrylphenyl polyoxyethylene ether (ethylene molecular number = 12), 1 gram of sodium lauryl sulfate, after mixing, add a pH regulator (1/15M dihydrogen phosphate Mixture of 1 volume of sodium and 9 volumes of 1/15M dipotassium hydrogen phosphate, pH 5.9) 69 grams, add slowly, stir well at the same time, dissolve and form a uniform transparent liquid, the decomposition rate is 3.52% at 40°C for 8 weeks, at room temperature (5-35°C) 1-year decomposition rate is 4.16%.

In 1979, the Japanese published patent (Shao 54-31566) was an oil-in-water emulsion for desinsection. 2-10% polyvinyl alcohol solution, or 0.1-2.0% gum arabic as a thickener, mixed with organophosphorus insecticides (soluble in water, less than 1000ppm at 10°C) and prepared with water. Made into an oil-in-water emulsion, this emulsion is superior to the emulsifiable concentrate of active ingredients in organic solvents, and has good performance. Example: 10 grams of fenitrothion, 40 grams of 10% polyoxyethylene alcohol solution, 50 grams of 20% Agrisol FL-100F, made into emulsion, kept at 40°C for 3 months, the decomposition rate is only 0.7%, fenitrothion No precipitation.

The patent (CA 1054049) applied by Japan in Canada in 1979 is a concentrated liquid insecticide composition. In order to make the insecticide soluble in water, a certain amount of surfactant is added to the water liquid of the insecticide to make it Form a stable high-concentration organophosphorus insecticide aqueous solution. Example: 5 grams of fenthion, 15 grams of bis(styrylmethylphenyl) polyoxyethylene ether, the concentrated emulsion prepared has the same stability and insecticidal activity as fenthion emulsifiable concentrate.

The patent (56-120609) that France applied for in Japan in 1981 was 20-55% phosalon concentrated emulsion. The preparation method is: in a container with a temperature of 52 ° C, add 575 ml of hot water, 50 grams of antifreeze ethylene glycol, and 50 grams of negative surfactant (Soprophor FL). Phosphoric acid 500 grams, make emulsion, grind with the ball mill that can cool rapidly with jacket, to be 0.5-10 micron (wherein 90% particle diameter is 2-5 micron) at 25 ℃, add Viscosifier xanthan gum (RhodopolXB ₁₁ ), made into an aqueous suspension of phosalon. There is no precipitation at 20°C for 3 months, and it can still maintain a suspension state at 35°C for 3 months without obvious chemical deterioration.

In 1981, Japanese published patents (Shao 56-49303, Shao 56-49307) were oil-in-water type suspension insecticidal and acaricidal compositions. Contains 1-50% of synthetic pyrethrin, 2-10% of polyvinyl alcohol or gum arabic, 0.1-20% of tackifier, and the balance is water, homogenized by a homogenizer for 5 minutes, particle size 1-40 microns, 50 ℃ The decomposition rate is 0% in 1 month, 1.0% in 3 months, and 3.5% in 6 months.

In 1982, the Japanese published patent (Shao 57-171431) was an economical and convenient manufacturing method for a uniform and stable excellent oil-in-water emulsion. Use a solvent that can be dissolved or dispersed by a high concentration of surfactant, and a nonionic surfactant with an HLB value of 2 or more, or an amphoteric surfactant, or an ionic surfactant, used alone or in combination, and used at temperatures below 100°C It is mixed with liquid or pasty oily substances and added with water to make an oil-in-water emulsion, which can be used in various fields such as medicine, food, cosmetics, coatings, fibers, and pesticides.

In the 1970s and 1980s, many patents related to water emulsions were continuously published abroad, which indicated that organophosphorus pesticide water emulsions had been concerned by pesticide formulation researchers.

The purpose of the present invention is to overcome the defects in the above-mentioned prior art, and propose several organophosphorus pesticide water emulsion formulas and processing techniques thereof, so that the water emulsion pesticide dosage form can be suitable for production.

Describe the main content of the present invention in detail below:

The organophosphorus pesticide emulsion in water provided by the invention is made of organophosphorus pesticide, emulsifier, stabilizer, antifreeze and water through a homogenization process. Fig. 1 is a process flow diagram of the present invention.

The five aqueous emulsions of the present invention use one of the following organophosphorus pesticides: fenitrothion, malathion, isofenphos-methyl, Daofengsan, and parathion-methyl.

The selected emulsifier of the present invention is one of two kinds of alkylaryl polyoxyethylene, polyoxypropylene ether (II) and alkylaryl formaldehyde resin polyoxyethylene ether (III), and its consumption is at least 2%, the highest 10%, preferably 5-7%, it can maintain long-term stable emulsified state of water emulsion.

The stabilizer used in the present invention is one of the following six kinds: hydroquinone, propylene oxide phenyl ether, pH6.6 buffer solution, tributyl phosphate, epoxy propylene, alkylphenol polyoxyethylene ether phosphate (IV). Among these six kinds, tributyl phosphate and alkylphenol polyoxyethylene ether phosphate are the best. They are both stabilizers and emulsifiers, which have dual effects and can reduce the amount of emulsifiers used. The qualified standard for selecting the stabilizer is: 54±2°C, and the decomposition rate of heat storage for two weeks is less than 10%.

The antifreezing agent that the present invention adopts is one of following four kinds: ethylene glycol, polyethylene glycol, glycerin, urea. Among these four, urea is the best, because urea has sufficient sources, is cheap, and has a fertilizer effect. It can also increase the specific gravity of the preparation, speed up the falling speed of fog droplets in the air, reduce water evaporation and drift distance, and is suitable for aircraft. And ground microspray, the formulation does not freeze at -10°C for 24 hours.

Describe respectively the composition of five kinds of aqueous emulsions of the present invention below:

1. Fenitrothion aqueous emulsion (by weight percentage): Fenitrothion 30-60; emulsifier 5-7; stabilizer 1-3; antifreeze agent 5-8; the balance is water.

2. Malathion aqueous emulsion composition (by weight percentage): Malathion 30-60; emulsifier 5-7; stabilizer 1-3; antifreeze agent 5-8; the balance is water.

3. Composition of isofenphos-methyl aqueous emulsion (by weight percentage): 30-60 isofenphos-methyl; 5-7 emulsifier; 1-3 stabilizer; 5-8 antifreeze; the balance is water.

4. The composition of Daofengsan water emulsion (by weight percentage): Daofengsan 30-60; emulsifier 5-7; stabilizer 1-3; antifreeze 5-8; the balance is water.

5. Composition of methyl parathion aqueous emulsion (by weight percentage): 30-60 methyl parathion; 5-7 emulsifier; 1-3 stabilizer; 5-8 antifreeze; the balance is water.

Embodiments of the present invention are described in detail below:

1. 50% fenitrothion emulsion in water

Get 61 kilograms of 83% fenitrothion crude oil (83% * 61=50.63), 5 kilograms of emulsifier alkyl aryl polyoxyethylene polyoxypropylene ethers, 2 kilograms of buffer solution of stabilizer pH6.6, antifreeze agent polyethylene 5 kilograms of diol, 28.3 kilograms of water, through emulsification, homogenization, detection, packing, promptly make 50% fenitrothion water emulsion.

The appearance of this product is a light brown emulsion, the specific gravity is 1.18±0.02°C (20°C), the viscosity is 100-600 centipoise, the dispersion performance in water is good, the surface tension (1000 times liquid) is 40-50 dynes/ ^cm2 , emulsified Stability (4000 rpm, 5 minutes) is stable, the average oil droplet diameter (1000 times liquid) is 1.7-1.8 microns, and it will not freeze for 24 hours at -10°C.

Product technical indicators: fenitrothion content ≥ 30%, good emulsion stability (diluted 500 times), PH value 5-7, good storage stability (54 ± 2 ℃, heat storage for two weeks, decomposition rate ≤ 10% ), stored at -10--15°C for 24 hours, the original physical and chemical properties can still be restored at room temperature. The product can be stored for more than three years at room temperature without decomposing.

Toxicity test results:

Table 1 The toxicity test results of 50% fenitrothion aqueous emulsion to cotton bollworm larvae

(October 21, 1988, Beijing Malianwa Office)

Test drug regression equation LC ₅₀ (ppm) LC ₅₀ Confidence Limits relative virulence 50% fenitrothion emulsion in water Y＝0.4816+2.5999x 54.6891 40.0286-74.7223 1 50% Fenitrothion EC Y=0.3366+2.1095x 162.4179 116.5617-226.3193 2.9698

The toxicity of 50% fenitrothion aqueous emulsion to cotton bollworm is higher than that of 50% fenitrothion EC. The ratio of the toxicity of the two is 1:3, that is, the toxicity is increased by 2 times, which fully shows that the toxicity of the water-emulsion formulation is superior to that of the emulsifiable concentrate formulation.

Table 2 10% Fenitrothion Water Emulsion and EC Toxicity Test Results for Insects

Test insects experiment method 10% water emulsion 10% EC Housefly larva Housefly larva Housefly adult cockroach dipping method dipping method drug film contact method drug film contact method LC ₅₀ LC ₅₀ KT ₅₀ KT ₅₀ 0.22ppm0.008ppm121 minutes142 minutes 0.25ppm0.009ppm110 minutes130 minutes

The insecticidal toxicity of fenitrothion emulsion in water to the tested insects was higher than that of fenitrothion emulsifiable concentrate, but for the knockdown toxicity of the tested insects, the effect of the aqueous emulsion was not as good as that of the EC, which was due to the lack of the effect of organic solvents.

Toxicity test results:

Table 3 Results of acute toxicity test of 50% fenitrothion aqueous emulsion and emulsifiable oil on rats

(June 11, 1990, Jiangxi Medical College Toxicology Laboratory)

  Toxicity test test agent Acute oral toxicity in rats   Dermal acute toxicity in rats LD ₅₀ mg/kg relative toxicity LD ₅₀ mg/kg relative toxicity 50% Fenitrothion Water Emulsion 50% Fenitrothion EC   1218621 10.5   23971598 10.67

The acute toxicity of 50% fenitrothion aqueous emulsion to SD rats is lower than that of 50% fenitrothion emulsifiable concentrate. The relative oral toxicity is 1:0.5, that is, the toxicity is reduced by 1/2; the relative percutaneous toxicity is 1:0.67, that is, the toxicity is reduced by 1/3, both of which are low toxicity.

Field efficacy test:

(Note: Unless otherwise indicated in the text, this manual is dated 1989)

Table 4 50% fenitrothion aqueous emulsion field efficacy test results table

date Place Area Prevention and control object Effective drug grams/mu Dose kg/N Anti-efficacy (%) test unit 8.308.306.265.267.267.267.26-8.39.69.179.189.3010.99 months Beijing Malianwa Beijing Malianwa Xinxiang County, Henan Xinxiang County, Xinxiang County, Henan Xinxiang County, Xinxiang County, Henan The test plot of the plot The test plot of the plot The test plot of the plot The test plot of the plot 2000 mu Cotton bollworm Cotton bollworm Cotton bollworm Cotton seedling aphids Cotton aphids Cotton bollworm Cotton aphids Cotton bollworms Four generations of cabbage caterpillars Four generations of three stem borers Four generations of three stem borers Four generations of three stem borers Rice Four generations of grasshoppers 252540204020-4040302424403316-24 10010010050100100100 micro spray 0.110010010010080   10010081.899.182.467.5-77.285-9010093.2595.3772.2595.088.5 Soben Soben Soben Soben Soben Soben Soben Nankang County Plant Protection Station Longnan County Plant Protection Station Ganzhou Plant Protection Station Longnan County Plant Protection Station Ganzhou Plant Protection Station

2. 50% malathion emulsion in water

Get 63 kilograms of 80% malathion crude oil (80% * 63=50.4), 6 kilograms of emulsifier alkyl aryl formaldehyde resin polyoxyethylene ethers, 2 kilograms of stabilizing agent hydroquinones, 6 kilograms of antifreeze glycerin, water 23.8 kilograms, through emulsification, homogenization, testing, packaging, promptly made 50% malathion emulsion in water.

The appearance of this product is a milky white emulsion, the specific gravity is 1.15±0.02 (20°C), the viscosity is 100-600 centipoise, the dispersion performance in water is good, the surface tension (1000 times liquid) is 40-50 dynes/ ^cm2 , and the emulsification stability (4000 rpm, 5 minutes) is stable, the average oil drop diameter (1000 times liquid) is 1.7-1.8 microns, the thermal storage decomposition rate is 6.64%, and it does not freeze for 24 hours at -10°C.

Product technical indicators: Malathion content ≥ 30%, emulsion stability (diluted 500 times) qualified, pH 5-7, good storage stability (54±2℃, thermal storage for two weeks decomposition rate ≤ 10%), -10 --Stored at 15°C for 24 hours, the original physical and chemical properties can still be restored at room temperature. The product can be stored at room temperature for more than three years without any decomposition.  Field efficacy test:

Table 5 50% malathion aqueous emulsion field efficacy test results table

date Place Area Control object Effective dosage g/mu Dosage Kg/mu Prevention effect (%) Test unit 5.265.265.266.69.6 Xinxiang County, Xinxiang County, Xinxiang County, Xinxiang County, Xinxiang County, Xinxiang County, Toli County, Xinjiang Trial plot Trial plot Trial plot Trial plot Trial plot cotton aphid cotton aphid cotton   2030404030 5050500.1 micro spray 0.1 micro spray 94.499.197.895.7100 Our office, our office, our office, our office

3. 30% isofenphos-methyl emulsion in water

Get 50 kilograms (60% * 50=30) of 60% methyl isofenphos crude oil, 5 kilograms of emulsifier alkyl aryl polyoxyethylene polyoxypropylene ether, 3 kilograms of stabilizing agent tributyl phosphates, 5 kilograms of antifreezing agent urea , 37 kilograms of water, through emulsification, homogenization, detection, packaging, promptly make 30% isofenalate-methyl emulsion in water.

The appearance of this product is a milky white emulsion, the specific gravity is 1.06±0.02 (20°C), the viscosity is 100-600 centipoise, the dispersion performance in water is good, the surface tension (1000 times liquid) is 40-50 dynes/ ^cm2 , and the emulsification stability ( 4000 rpm, 5 minutes) is stable, the average oil droplet diameter (1000 times liquid) is 1.7-1.8 microns, the thermal storage decomposition rate is 7.70%, and it does not freeze at -10°C for 24 hours.

Product technical indicators: isofenphos-methyl content ≥ 30%, emulsion stability qualified (diluted 500 times), pH value 5-7, good storage stability (54±2°C, thermal storage for two weeks decomposition rate ≤ 10%) , -10 ℃ - 15 ℃ cold storage for 24 hours, the original physical and chemical properties can still be restored at room temperature, the product can be stored at room temperature for more than three years.

Field efficacy test:

Table 6 Result of field efficacy test of 30% isofenphos-methyl emulsion in water

date Place Area Control object Effective dosage g/mu Dose Kg/mu Prevention effect (%) test unit 5.265.265.266.69.6 Xinxiang County, Xinxiang County, Xinxiang County, Xinxiang County, Xinxiang County, Xinxiang County, Toli County, Xinjiang Trial plot Trial plot Trial plot Trial plot Trial plot cotton aphid cotton aphid cotton 2030403030 5050500.1 micro spray 0.1 micro spray 92.196.598.586.8100 this office this office this office this office

4. 50% Daofeng water emulsion

Get 55 kilograms of 92% Daofengsan crude oil (92% * 55=50.6), 7 kilograms of emulsifier alkyl aryl formaldehyde resin polyoxyethylene ethers, 3 kilograms of stabilizer epichlorohydrin, 8 kilograms of antifreeze glycerin, water 28.2 kg, after emulsification, homogenization, testing, and packaging, it is made into 50% Daofeng San water emulsion.

The appearance of this product is a milky white emulsion, the specific gravity is 1.13±0.02 (20°C), the viscosity is 100-600 centipoise, the dispersion performance in water is good, the surface tension (1000 times liquid) is 40-50 dynes/ ^cm2 , and the emulsification stability ( 4000 rpm, 5 minutes) is stable, the average oil drop diameter (1000 times liquid) is 1.7-1.8 microns, the thermal storage decomposition rate is 7.29%, and it does not freeze at -10°C for 24 hours.

Product technical indicators: Daofengsan content ≥ 30%, emulsion stability qualified (diluted 500 times), pH value 5-7, storage stability (54 ± 2 ℃, decomposition rate ≤ 10% after two weeks of heat storage), - Cold storage at 10°C--15°C for 24 hours, the original physical and chemical properties can still be restored at room temperature, and the product can be stored for more than three years at room temperature.

Field efficacy test:

Table 7 50% Daofeng Sanshui Emulsion Field Efficacy Test Results Table

date Place Area Control object Effective dosage g/mu Dose Kg/mu Anti-efficacy (%) test unit 5.265.265.266.69.6 Xinxiang County, Xinxiang County, Xinxiang County, Xinxiang County, Xinxiang County, Xinxiang County, Toli County, Xinjiang Trial plot Trial plot Trial plot Trial plot Trial plot cotton aphid cotton aphid cotton 2030404030 5050500.1 micro spray 0.1 micro spray 97.299.599.597.5100 this office this office this office this office

5. 50% methyl parathion emulsion in water

Get 56 kilograms of 90% methyl parathion crude oil (90% * 56=50.4), 5 kilograms of emulsifier alkyl aryl formaldehyde resin polyoxyethylene ether, 1 kilogram of stabilizer propylene oxide phenyl ether, antifreeze agent glycerin 5 kg, 33.8 kg of water, through emulsification, homogenization, testing, packaging, promptly made 50% methyl parathion emulsion in water.

The appearance of this product is a light brown emulsion, the specific gravity is 1.20±0.02 (20°C), the viscosity is 100-600 centipoise, the dispersion performance in water is good, the surface tension (1000 times liquid) is 40-50 dyne/ ^cm2 , and the emulsification is stable The property is stable (4000 rpm, 5 minutes), the average oil droplet diameter (1000 times liquid) is 1.7-1.8 microns, the heat storage decomposition rate is 8.87%, and it will not freeze for 24 hours at -10°C.

Product technical indicators: methyl parathion content ≥ 30%, qualified emulsion stability (diluted 500 times), pH value 5-7, good storage stability (54 ± 2 ℃, decomposition rate ≤ 10% after two weeks of heat storage) , -10 ℃ - 15 ℃ cold storage for 24 hours, the original physical and chemical properties can still be restored at room temperature, the product can be stored at room temperature for more than three years.

Field efficacy test:

Table 8 50% methyl parathion water emulsion field efficacy test result table

date Place Area Control object Effective dosage g/mu Dose Kg/mu Prevention effect (%) test unit 5.265.265.269.6 Xinxiang County, Henan Xinxiang County, Henan Xinxiang County, Henan Northeast Wang Township, Beijing Trial plot Trial plot Trial plot Trial Cotton Aphid cotton Aphid cotton Aphid cabbage caterpillar   20304030 5050500.1 Microspray 95.297.199.8100 this office this office this office

Compared with the prior art, the present invention has the following positive effects:

1. The organophosphorus pesticide aqueous emulsion of the present invention has a high content of active ingredients, which is equivalent to that of the existing emulsifiable concentrate. In the past, it was reported in the literature that the active ingredient content of the organophosphorus pesticide aqueous emulsion was very low, only 0.001-5%, and the highest was no more than 20%.

2, the surfactant consumption of organophosphorus pesticide water emulsion of the present invention is lower, only 5-7%, and the surfactant consumption of past document report organophosphorus pesticide water emulsion is higher, general consumption is all greater than 20%, the highest Up to 50%, it directly affects economic benefits and increases costs, so it cannot be put into mass production.

3. The organophosphorus pesticide emulsion in water of the present invention uses a phosphorus-containing surfactant as a stabilizer, which can reduce the amount of emulsifier used to further reduce costs.

4. The organophosphorus pesticide emulsion in water of the present invention uses urea as an antifreeze agent, which has sufficient sources, is cheap, and has a fertilizing effect. This formulation does not freeze at -10°C for 24 hours. It can increase the specific gravity of the preparation, increase the landing speed in the air, reduce drift, and is suitable for spraying by aircraft.

5. The aqueous emulsion of organophosphorus pesticide of the present invention can be directly sprayed with the stock solution without diluting with water, and can be used for aircraft or ground micro-spraying, with a dose of 50-400 g/mu and an effective dose of 10-50 g/mu, which is more suitable for use on the ground Manual spraying machines carry out constant spraying, with a dose of 50-100 kg/mu, and the work efficiency can be increased by 100 times. However, in the past literature reports on organophosphorus pesticide aqueous emulsions, there is no direct spraying of the stock solution, which is used for micro-spraying on aircraft or on the ground.

Claims (5)

1, a kind of sumithion aqueous emulsion is characterized in that forming (percentage by weight) by following material: sumithion 30-60; Emulsifier is one of alkylaryl polyoxyethylene poly-oxygen propylene aether or alkylaryl formaldehyde resin APEO 5-7; Stabilizing agent is hydroquinones or expoxy propane phenyl ether or pH6.6 buffer solution or tributyl phosphate or one of epoxychloropropane or alkylphenol polyoxyethylene phosphate 1-3; Antifreezing agent is ethylene glycol or polyethylene glycol or one of glycerine or urea 5-8; Surplus is a water.

2, a kind of malathion aqueous emulsion is characterized in that forming (percentage by weight) by following material: malathion 30-60; Emulsifier is one of alkylaryl polyoxyethylene poly-oxygen propylene aether or alkylaryl formaldehyde resin APEO 5-7; Stabilizing agent is hydroquinones or expoxy propane phenyl ether or pH6.6 buffer solution or tributyl phosphate or one of epoxychloropropane or alkylphenol polyoxyethylene phosphate 1-3; Antifreezing agent is ethylene glycol or polyethylene glycol or one of glycerine or urea 5-8; Surplus is a water.

3, a kind of Isofenphos methyl aqueous emulsion is characterized in that forming (percentage by weight) by following material: Isofenphos methyl 30-60; Emulsifier is one of alkylaryl polyoxyethylene poly-oxygen propylene aether or alkylaryl formaldehyde resin APEO 5-7; Stabilizing agent is hydroquinones or expoxy propane phenyl ether or pH6.6 buffer solution or tributyl phosphate or one of epoxychloropropane or alkylphenol polyoxyethylene phosphate 1-3; Antifreezing agent is ethylene glycol or polyethylene glycol or one of glycerine or urea 5-8; Surplus is a water.

4, a kind of phenthoate dimephenthoate cidial aqueous emulsion is characterized in that forming (percentage by weight) by following material: phenthoate dimephenthoate cidial 30-60; Emulsifier is one of alkylaryl polyoxyethylene poly-oxygen propylene aether or alkylaryl formaldehyde resin APEO 5-7; Stabilizing agent is hydroquinones or expoxy propane phenyl ether or pH6.6 buffer solution or tributyl phosphate or one of epoxychloropropane or alkylphenol polyoxyethylene phosphate 1-3; Antifreezing agent is ethylene glycol or polyethylene glycol or one of glycerine or urea 5-8; Surplus is a water.

5, a kind of parathion-methyl aqueous emulsion is characterized in that forming (percentage by weight) by following material: Isofenphos methyl 30-60; Emulsifier is one of alkylaryl polyoxyethylene poly-oxygen propylene aether or alkylaryl formaldehyde resin APEO 5-7; Stabilizing agent is hydroquinones or expoxy propane phenyl ether or pH6.6 buffer solution or tributyl phosphate or one of epoxychloropropane or alkylphenol polyoxyethylene phosphate 1-3; Antifreezing agent is ethylene glycol or polyethylene glycol or one of glycerine or urea 5-8; Surplus is a water.

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