CN111972429A - Preparation method of double-microcapsule longicorn pesticide - Google Patents
Preparation method of double-microcapsule longicorn pesticide Download PDFInfo
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- CN111972429A CN111972429A CN202010848784.9A CN202010848784A CN111972429A CN 111972429 A CN111972429 A CN 111972429A CN 202010848784 A CN202010848784 A CN 202010848784A CN 111972429 A CN111972429 A CN 111972429A
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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
- A01N53/00—Biocides, pest repellants or attractants, or plant growth regulators containing cyclopropane carboxylic acids or derivatives thereof
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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
- A01N25/26—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 in coated particulate form
- A01N25/28—Microcapsules or nanocapsules
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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
- A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
- A01N47/40—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having a double or triple bond to nitrogen, e.g. cyanates, cyanamides
Abstract
The invention relates to a preparation method of a double-microcapsule longicorn pesticide for killing longicorn. The method comprises the steps of preparing a thiacloprid slow-release microcapsule suspending agent and a bifenthrin microcapsule suspending agent, and then mixing and stirring the bifenthrin microcapsule suspending agent and the thiacloprid slow-release microcapsule suspending agent according to the mass ratio of 1: 2-8. The pesticide prepared by the method has better killing effect and prevention and control effect on longhorn beetles.
Description
Technical Field
The present invention relates to a preparation method of pesticide, in particular, it relates to a preparation method of pesticide for killing longicorn.
Background
Longicorn is an arthropod coleopteran insect, a chewing mouthpart and a main forestry pest in China. The variety of longhorned beetles is many, 22000 species are known in the world, about 2200 species are also known in China, the longhorned beetles are widely distributed and are generally harmful, and almost every kind of trees are invaded by different kinds of longhorned beetles. The damaged trees are 28 longicorn trees like mulberry trees, 25 willow trees and poplar trees, 18 citrus trees and 23 pine trees. The longhorns are the most abundant and common longhorns, such as anoplophora glabripennis, anoplophora persicifolia, anoplophora leucocephala, longhorn beetle, and the like.
Among them, Monochamus alternatus not only eats the trunk and branches, but also spreads the vector insects which destroy the pine wood nematode (Bursaphelenchus xylophilus) disease, and is listed as the quarantine insect in the world and the country. The larva of Monochamus alternatus affects the transportation of water and nutrient substances in pine bodies by damaging and cutting the conduction tissues through the phloem and xylem of branches of the pine, and the imago of the Monochamus alternatus is the main transmitter of pine wood nematodes. Pine wood nematode disease is the most dangerous forest pest in the world, and the host plant can die 40 days after being infected with the pine wood nematode disease, so the pine wood nematode disease is called pine tree 'cancer'. It is also called pine tree AIDS because of its extremely fast transmission speed and difficulty in controlling infection. Because the pine wood nematode survives in the trunk, the drug is difficult to directly act on the body of the pine wood nematode, the most effective way for controlling the pine wood nematode disease at present is to control the medium insect of the pine wood nematode, namely monochamus alternatus, and the disease is transmitted by the actions of feeding, laying eggs and the like of the adult carrying the pine wood nematode.
The most direct and effective method for controlling longhorns at present is chemical control, including chemical insecticides and chemical attractants. For forests endangered by longicorn, the traditional method is to spray a medicament in a large area, directly spray or spray the medicament to the pine, so that the medicament is large in dosage and short in duration, multiple times of pesticide spraying are needed, chemical pesticides are easy to scatter in the air, water and non-target animals and plants, a large number of natural enemies of pests are killed, the target pests are easy to have drug resistance, the control effect is low, and adverse effects such as environmental pollution are caused.
At present, the trunk is also adopted to inject the pesticide to prevent and treat longicorn larvae and pine wood nematodes, the pesticide is injected into the tree body by a certain mode, and the pesticide is conveyed to each part of the tree body by virtue of transpiration pulling force of the tree body, so that the aims of supplementing nutrition and preventing and treating tree diseases and insect pests are fulfilled. The technology has the characteristics of high liquid medicine utilization rate, wide insecticidal spectrum, environmental protection, safe use, small weather influence and the like, and is applied to pest control of forests, parks, urban landscaping and roadside trees at home and abroad at present. However, the trunk injection cost is high, the preparation time is long, the method is not economical and environment-friendly, the effect can be exerted on the preservation of ancient and famous trees and small-area gardens, but the method is difficult to implement for large-area prevention and treatment.
Disclosure of Invention
The invention aims to provide a preparation method of a double-microcapsule longicorn pesticide, and the pesticide prepared by the method has better killing effect and prevention and control effect on longicorn.
The preparation method of the double-microcapsule longicorn pesticide comprises the following steps:
step one, preparation of thiacloprid sustained-release microcapsule suspending agent
(1) Adding urea and formaldehyde into a reaction kettle according to the mass ratio of 1: 0.5-1.5, mixing and reacting, adjusting the pH of the mixed solution to 8-12 at the temperature of 50-80 ℃ and the rotating speed of 30-130 r/min, and reacting for 1-5 hours to prepare the capsule wall prepolymer.
(2) Mixing the capsule wall prepolymer, the emulsifier and deionized water according to a mass ratio of 5: 0.1-1: 30-60, and stirring at a rotating speed of 20-300 r/min for 4-7 min to form a uniform aqueous solution; adding a thiacloprid oil suspending agent capsule core, the mass ratio of which to a capsule wall prepolymer is 10: 2-5, into the homogeneous phase aqueous solution, shearing the homogeneous phase aqueous solution for 3-5 min at the speed of 800-1500 r/min by using a high-speed shearing machine, then transferring the homogeneous phase aqueous solution into a common stirring kettle, stirring the homogeneous phase aqueous solution at the rotating speed of 20-300 r/min, adjusting the pH value to 1-5 within 30-120 min, stirring the obtained emulsion at the rotating speed of 20-300 r/min at the temperature of 50-60 ℃, reacting for 2-3 h, and finally adjusting the pH value of the reacted emulsion to 6-8 at the rotating speed of 20-300 r/min, thus obtaining the thiacloprid slow release microcapsule suspending agent.
Step two, preparation of bifenthrin microcapsule suspending agent
Mixing diethylamine and diethylenetriamine into a mixed solution A according to the mass ratio of 10: 1-10; mixing crude bifenthrin, xylene and toluene 2, 6-diisocyanate into a mixed solution B according to a mass ratio of 10: 5-15: 1-5, sucking the mixed solution B into an oil phase kettle and stirring; mixing tap water and an emulsifier into a mixed solution C according to the mass ratio of 100: 0.5-5, adding the mixed solution C into a capsule forming kettle, stirring, putting materials in an oil phase kettle into the capsule forming kettle at the rotating speed of 30-130 r/min, starting timing, adding the mixed solution A after 5-15 minutes, transferring the mixed solution A into a curing kettle after 25-35 minutes to obtain the touch-breaking bifenthrin microcapsule suspending agent, wherein the mass ratio of the mixed solution C to the mixed solution B to the mixed solution A is 100: 30-60: 0.5-2.
And step three, mixing and stirring the bifenthrin microcapsule suspending agent obtained in the step two and the thiacloprid slow-release type microcapsule suspending agent obtained in the step one according to the mass ratio of 1: 2-8 to obtain the compound suspending agent.
The emulsifier is one or a mixture of two or more of lignosulfonate, polyalkyl naphthalene sulfonate, styrene-phenol polyoxyethylene ether sulfonate, formaldehyde-naphthalene polymer polyoxyethylene-propylene ether phosphate, polycarboxylate, polyacrylate, sodium polyacrylate, polyaspartic acid sodium and polymaleic acid-sodium acrylate.
Bifenthrin is a pyrethroid insecticide variety, is widely used in various countries in the world, has the characteristics of strong knock-down effect, broad spectrum, high efficiency, rapidness, long residual effect and the like, is mainly based on contact killing and stomach poisoning effects, has no systemic effect, and can be used for preventing and controlling various agricultural and forestry pests such as coleoptera, cotton bollworm, pink bollworm, tea geometrid, tea caterpillar, apple or hawthorn red spider, peach fruit borer, cabbage aphid, cabbage caterpillar, diamondback moth, citrus leaf miner and the like.
Thiacloprid is chloronicotinyl insecticide, has a different action mechanism from other traditional insecticides, mainly acts on a membrane after insect nerve junction, is combined with a nicotine acetylcholine receptor to interfere normal conduction of an insect nervous system, causes blockage of a nerve channel, causes a large amount of accumulation of acetylcholine, enables the insect to be excited abnormally, and is killed by general spasm and paralysis, has strong systemic, contact and stomach toxicity effects, has no cross resistance with conventional insecticides such as pyrethroids, organophosphates and carbamates, and can be used for resistance control, and the thiacloprid has a special effect on adult longicorn.
The double-microcapsule longicorn pesticide prepared by the method can fully exert the quick-acting contact toxicity of bifenthrin and the systemic and stomach toxicity effects of thiacloprid. The bifenthrin is made into a pressure-sensitive touch-breaking type microcapsule, which is purposeful, the effective components are broken when the longicorn adults are trodden to touch the microcapsule, the effective components are released at one time, the medicine enters the longicorn from the foot appendage of the large-scale insects such as the longicorn and the like to kill the pests such as the longicorn, the non-trotter microcapsule can be kept in a good state for a long time, the lasting period can reach more than 50 days, the quick-acting touch-killing effect of the bifenthrin can be exerted to the maximum, and a first defense line for the longicorn is constructed after the longicorn adults emerge. The slow released thiacloprid microcapsule is prepared with porous capsule shell to release slowly thiacloprid medicine, and after the medicine is absorbed by pine needle and the longicorn is fed to needle for replenishing nutrients, the thiacloprid acts on the connected back membrane of insect nerve and combines with nicotine acetylcholine receptor to interfere normal conduction of insect nervous system, so as to block nerve channel, accumulate acetylcholine in great amount, excite insect, kill systemic spasm and paralysis, and form systemic and stomach poisoning effect on adult longicorn. The slow release time of thiacloprid is adjusted to about 50 days by a capsule processing control technology. The double-microcapsule longicorn pesticide prepared by the method can be used for ultralow-capacity spraying of airplanes and conventional spraying of a motor sprayer.
The double-microcapsule longicorn pesticide prepared by the method of the invention utilizes the combination of active matters with different action mechanisms to strengthen the killing effect of the pesticide on longicorn and delay the resistance possibly generated when the single agents of the pyrethroid and the thiacloprid are used; and the combination of the microcapsules with different release modes strengthens the killing effect of the medicament on the longicorn, constructs two different lines of defense for adult monochamus alternatus hopes, and presses the density of the longicorn to an extremely low level, thereby reducing the risk of the retransmission of the pine wilt disease. The double-microcapsule longicorn pesticide prepared by the method has better killing effect and prevention and control effect on longicorn, can be used alternately with other medicaments, is safe to predation and parasitic natural enemies, people and livestock, has no residue in water areas, soil and air, has no pollution to the environment, has no phytotoxicity to crops, and is safe to fish, bees and other aquatic organisms.
And (3) verification experiment:
the specific experiment that the double-microcapsule longicorn pesticide prepared by the method has a good insecticidal effect proves that compared with a common single-microcapsule suspending agent, the product performance of the specific cypermethrin microcapsule suspending agent with a mass percentage concentration of 8% and the thiacloprid microcapsule suspending agent with a mass percentage concentration of 3% is compared with the killing effect of monochamus alternatus.
The specific comparison conditions were:
the pesticide is prepared by spraying three medicaments of 4 percent double-microcapsule longicorn pesticide, 8 percent cypermethrin microcapsule suspending agent and 3 percent thiacloprid microcapsule suspending agent according to diluted 500 times, 300 times and 200 times respectively. In the previous week of prevention, 27 traps were respectively hung in the flying prevention (1) area (4% double-microcapsule longicorn insecticide), the flying prevention (2) area (8% cypermethrin microcapsule suspending agent), the flying prevention (3) area (3% thiacloprid microcapsule suspending agent) and the clear water control area, and were investigated once in 5 days after prevention, and then the trapping situation was observed every other week, and the trapping amount was recorded as shown in table 1.
Time to hang trap: 12 days 5 month in 2020; the application time is as follows: year 2020, 5, 20 months; the investigation time points were 5/19 (before administration) in 2020, 25/5/6/1/6/8/6/15/6/22/6/29/7/6/7/13/2020.
4% double-microcapsule longicorn insecticide, 8% cypermethrin microcapsule suspending agent and 3% thiacloprid microcapsule suspending agent are sprayed on an airplane to prevent and treat monochamus alternatus hope, the three agents have good prevention and treatment effects on longicorn in a long time, as shown in table 2, after the application, the reduction rate of longicorn is respectively 92.3%, 85.8% and 75.9%, but the prevention effect is differentiated, although the prevention effects of the 4% double-microcapsule longicorn insecticide and the 8% cypermethrin microcapsule suspending agent are continuously reduced along with time, after 33d, the prevention effects of the 4% double-microcapsule longicorn insecticide and the 8% cypermethrin microcapsule suspending agent can also reach 81.9% and 77.1%, after 47 days, the killing and inhibition effects on longicorn are still certain, the reduction rate of longicorn is respectively 27.4%, 24.3%, the prevention effects are 24.8%, 21.7%, and the 3% thiacloprid microcapsule suspending agent is rapidly reduced after 19 days of application, almost 0 by about one month.
TABLE 1 Observation of trap in airplane control monochamus alternatus hind forest
TABLE 24% comparison of field control results for Monochamus alternatus insecticide with two microcapsule suspensions for Monochamus alternatus
Detailed Description
Example 1
Step one, preparation of thiacloprid sustained-release microcapsule suspending agent
(1) Adding 5Kg of urea and 2.5Kg of formaldehyde into a reaction kettle, mixing and reacting at 50 ℃ and 30r/min, adjusting the pH of the mixed solution to 8 with an ammonia solution, and reacting for 1 hour to prepare the capsule wall prepolymer.
(2) Mixing 5Kg of capsule wall prepolymer, 0.1Kg of emulsifier and 30Kg of deionized water, and stirring at the rotating speed of 200r/min for 4min to form a uniform aqueous solution; adding 25Kg of capsule core of the thiacloprid oil suspending agent into the homogeneous phase aqueous solution, shearing for 3min at the speed of 800r/min by using a high-speed shearing machine, then transferring into a common stirring kettle, stirring at the rotating speed of 200r/min, adjusting the pH to 1 by using a hydrochloric acid solution with the concentration of 5% within 30 min, then stirring the obtained emulsion at the rotating speed of 200r/min at the temperature of 50 ℃, reacting for 2h, and finally adjusting the pH to 6 by using a sodium hydroxide aqueous solution with the concentration of 2% under stirring at the rotating speed of 200r/min to obtain the thiacloprid slow-release microcapsule suspending agent.
Step two, preparation of bifenthrin microcapsule suspending agent
Mixing 0.45Kg of diethylamine and 0.05Kg of diethylenetriamine into a mixed solution A; mixing 18.75Kg of crude bifenthrin, 9.38Kg of xylene and 1.88Kg of toluene 2, 6-diisocyanate into a mixed solution B, sucking the mixed solution B into an oil phase kettle and stirring; mixing 99.5Kg of tap water and 0.5Kg of emulsifier to form a mixed solution C, adding the mixed solution C into a capsule forming kettle, stirring, putting the materials in an oil phase kettle into the capsule forming kettle at the rotating speed of 30r/min, starting timing, adding the mixed solution A at the time of 5 minutes, and transferring the mixed solution A into a curing kettle after 25 minutes to obtain the touch breaking type bifenthrin microcapsule suspending agent.
And step three, mixing and stirring 10Kg of bifenthrin microcapsule suspending agent obtained in the step two and 20Kg of thiacloprid slow-release type microcapsule suspending agent obtained in the step one to obtain 30Kg of double-microcapsule longicorn pesticide.
Example 2
Step one, preparation of thiacloprid sustained-release microcapsule suspending agent
(1) Adding 5Kg of urea and 7.5Kg of formaldehyde into a reaction kettle, mixing and reacting at 80 ℃ and 130r/min, adjusting the pH of the mixed solution to 12 with an ammonia solution, and reacting for 5 hours to obtain the capsule wall prepolymer.
(2) Mixing 5Kg of capsule wall prepolymer, 1Kg of emulsifier and 60Kg of deionized water, and stirring at the rotating speed of 300r/min for 7min to form a uniform aqueous solution; adding 10Kg of capsule core of the thiacloprid oil suspending agent into the homogeneous phase aqueous solution, shearing for 5min at the speed of 1500r/min by using a high-speed shearing machine, then transferring into a common stirring kettle, stirring at the rotating speed of 300r/min, adjusting the pH to 5 by using a hydrochloric acid solution with the concentration of 5% within 120 min, then stirring the obtained emulsion at the rotating speed of 300r/min at the temperature of 60 ℃, reacting for 3h, and finally adjusting the pH to 8 by using a sodium hydroxide aqueous solution with the concentration of 2% under stirring at the rotating speed of 300r/min to obtain the thiacloprid slow-release microcapsule suspending agent.
Step two, preparation of bifenthrin microcapsule suspending agent
Mixing 1.13Kg of diethylamine with 0.57Kg of diethylenetriamine to form a mixed solution A; mixing 15Kg of crude bifenthrin, 22.5Kg of dimethylbenzene and 7.5Kg of toluene 2, 6-diisocyanate into a mixed solution B, sucking the mixed solution B into an oil phase kettle and stirring the mixed solution B; mixing 95Kg of tap water and 5Kg of emulsifier to form a mixed solution C, adding the mixed solution C into a capsule forming kettle, stirring, putting materials in an oil phase kettle into the capsule forming kettle at the rotating speed of 130r/min, starting timing, adding the mixed solution A after 15 minutes, and transferring the mixed solution A into a curing kettle after 35 minutes to obtain the touch breaking type bifenthrin microcapsule suspending agent.
And step three, mixing and stirring 5Kg of bifenthrin microcapsule suspending agent obtained in the step two and 40Kg of thiacloprid slow-release type microcapsule suspending agent obtained in the step one to obtain 45Kg of double-microcapsule longicorn pesticide.
Example 3
Step one, preparation of thiacloprid sustained-release microcapsule suspending agent
(1) Adding 5Kg of urea and 5Kg of formaldehyde into a reaction kettle, mixing and reacting at 65 ℃ and 80r/min, adjusting the pH of the mixed solution to 10 with an ammonia solution, and reacting for 3 hours to obtain the capsule wall prepolymer.
(2) Mixing 5Kg of capsule wall prepolymer, 0.5Kg of emulsifier and 45Kg of deionized water, and stirring at the rotating speed of 250r/min for 5min to form a uniform aqueous solution; adding 14.3Kg of capsule core of thiacloprid oil suspending agent into the homogeneous phase aqueous solution, shearing for 4min at the speed of 1100r/min by using a high-speed shearing machine, then transferring into a common stirring kettle, stirring at the rotating speed of 250r/min, adjusting the pH to 3 by using a hydrochloric acid solution with the concentration of 5% within 75 min, stirring the obtained emulsion at the rotating speed of 250r/min at the temperature of 55 ℃, reacting for 2.5h, and finally adjusting the pH to 7 by using a sodium hydroxide aqueous solution with the concentration of 2% under stirring at the rotating speed of 250r/min to obtain the thiacloprid slow-release microcapsule suspending agent.
Step two, preparation of bifenthrin microcapsule suspending agent
Mixing 1Kg of diethylamine and 1Kg of diethylenetriamine into a mixed solution A; mixing 26.1Kg of crude bifenthrin, 26.1Kg of xylene and 7.8Kg of toluene 2, 6-diisocyanate into a mixed solution B, sucking the mixed solution B into an oil phase kettle and stirring the mixed solution B; mixing 97.1Kg of tap water and 2.9Kg of emulsifier to form a mixed solution C, adding the mixed solution C into a capsule forming kettle, stirring, putting the materials in an oil phase kettle into the capsule forming kettle at the rotating speed of 80r/min, starting timing, adding the mixed solution A at 10 minutes, and transferring the mixed solution A into a curing kettle after 30 minutes to obtain the touch-breaking bifenthrin microcapsule suspending agent.
And step three, mixing and stirring 10Kg of bifenthrin microcapsule suspending agent obtained in the step two and 50Kg of thiacloprid slow-release type microcapsule suspending agent obtained in the step one to obtain 60Kg of double-microcapsule longicorn pesticide.
In the 3 embodiments, the emulsifier is one or a mixture of two or more of lignosulfonate, polyalkylnaphthalene sulfonate, styrene-phenol polyoxyethylene ether sulfonate, formaldehyde-naphthalene polymer polyoxyethylene-propylene ether phosphate, polycarboxylate, polyacrylate, sodium polyaspartate and polymaleic acid-sodium acrylate.
Claims (2)
1. A preparation method of a double-microcapsule longicorn insecticide is characterized by comprising the following steps:
step one, preparation of thiacloprid sustained-release microcapsule suspending agent
(1) Adding urea and formaldehyde into a reaction kettle according to the mass ratio of 1: 0.5-1.5, mixing and reacting, adjusting the pH of the mixed solution to 8-12 at the temperature of 50-80 ℃ and the rotating speed of 30-130 r/min, and reacting for 1-5 hours to prepare a capsule wall prepolymer;
(2) mixing the capsule wall prepolymer, the emulsifier and deionized water according to a mass ratio of 5: 0.1-1: 30-60, and stirring at a rotating speed of 200-300 r/min for 4-7 min to form a uniform aqueous solution; adding a thiacloprid oil suspending agent capsule core, the mass ratio of which to a capsule wall prepolymer is 10: 2-5, into the homogeneous phase aqueous solution, shearing the homogeneous phase aqueous solution for 3-5 min at the speed of 800-1500 r/min by using a high-speed shearing machine, then transferring the homogeneous phase aqueous solution into a common stirring kettle, stirring the homogeneous phase aqueous solution at the rotating speed of 200-300 r/min, adjusting the pH value to 1-5 within 30-120 min, then stirring the obtained emulsion at the temperature of 50-60 ℃ at the rotating speed of 200-300 r/min, reacting for 2-3 h, and finally adjusting the pH value of the reacted emulsion to 6-8 at the rotating speed of 200-300 r/min to obtain a thiacloprid slow-release microcapsule suspending agent;
step two, preparation of bifenthrin microcapsule suspending agent
Mixing diethylamine and diethylenetriamine into a mixed solution A according to the mass ratio of 10: 1-10; mixing crude bifenthrin, xylene and toluene 2, 6-diisocyanate into a mixed solution B according to a mass ratio of 10: 5-15: 1-5, sucking the mixed solution B into an oil phase kettle and stirring; mixing tap water and an emulsifier into a mixed solution C according to the mass ratio of 100: 0.5-5, adding the mixed solution C into a capsule forming kettle, stirring, putting materials in an oil phase kettle into the capsule forming kettle at the rotating speed of 30-130 r/min, starting timing, adding the mixed solution A after 5-15 minutes, transferring the mixed solution A into a curing kettle after 25-35 minutes to obtain the touch-breaking bifenthrin microcapsule suspending agent, wherein the mass ratio of the mixed solution C to the mixed solution B to the mixed solution A is 100: 30-60: 0.5-2.
And step three, mixing and stirring the bifenthrin microcapsule suspending agent obtained in the step two and the thiacloprid slow-release type microcapsule suspending agent obtained in the step one according to the mass ratio of 1: 2-8 to obtain the compound suspending agent.
2. The process for preparing double-microcapsule longicorn insecticide according to claim 1, wherein: the emulsifier is one or a mixture of two or more of lignosulfonate, polyalkyl naphthalene sulfonate, styrene-phenol polyoxyethylene ether sulfonate, formaldehyde-naphthalene polymer polyoxyethylene-propylene ether phosphate, polycarboxylate, polyacrylate, sodium polyacrylate, polyaspartic acid sodium and polymaleic acid-sodium acrylate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116035017A (en) * | 2022-10-08 | 2023-05-02 | 南通江山农药化工股份有限公司 | Prochloraz-flumioxazin microcapsule suspending agent and preparation method thereof |
| WO2023167577A1 (en) * | 2022-03-03 | 2023-09-07 | Ribot Barroso Jose Maria | Optimised microencapsulated formulation with insecticidal effect and prolonged release to be incorporated into paint, method for forming microcapsules and paint obtained |
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