CN115669667A - Composition containing 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid as well as preparation method and application thereof - Google Patents
Composition containing 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid as well as preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a composition containing 2-methyl-4-chloroisooctyl ester, fluroxypyr-meptyl ester and clopyralid, a preparation method and application thereof, wherein the 2-methyl-4-chloroisooctyl ester, the fluroxypyr-meptyl ester and the clopyralid are compounded, so that the composition has a remarkable synergistic effect on the aspect of preventing and treating weeds. The invention provides a dispersible oil suspending agent formulation of 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid, which improves the emulsifying dispersibility, the suspension rate and the stability of the dispersible oil suspending agent by selecting an auxiliary agent, and the obtained dispersible oil suspending agent has the advantages of good emulsifying dispersibility, high suspension rate, difficult layering or oil precipitation and good heat storage stability.
Description
Technical Field
The invention relates to a composition containing 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid as well as a preparation method and application thereof, belonging to the technical field of pesticides.
Background
2 methyl 4 chloro isooctyl ester, chemical name: the 4-chloro-2-methyl phenoxyacetic acid isooctyl ester belongs to a selective hormone phenoxycarboxylic acid herbicide, has stronger systemic conductivity, and can destroy the conduction tissues of dicotyledons, so that the growth and development of the dicotyledons are interfered, the stems and the leaves are twisted, and the stem base is expanded and thickened or cracked. At present, the main dosage forms of 2-methyl-4-chloroisooctyl ester are aqueous emulsion and missible oil.
Fluroxypyr meptyl ester, chemical name: 4-amino-3,5-dichloro-6-fluoro-2-pyridyloxyacetic acid isooctyl ester belongs to pyridine systemic conduction type post-emergence stem and leaf treatment herbicide, is quickly absorbed by weeds after application, enables sensitive plants to have the reaction of typical hormone herbicide and conduct to all parts of the whole plant, enables the plants to be deformed and twisted, and finally dies. At present, the main dosage forms of fluroxypyr meptyl are emulsion in water and missible oil.
Clopyralid, chemical name: 3,6-dichloropyridine-2-carboxylic acid belongs to pyridine raw drugs, is an artificially synthesized plant growth hormone, is mainly absorbed by roots and leaves of plants and then is conducted in the plants, so that the conductivity of the plant growth hormone is strong. After being applied to weeds, the weeds are absorbed by leaves or roots of plants and then are conducted in the plants, so that the uncontrolled cell division and disordered growth are caused, finally, the vascular bundles are damaged, and the cell division and growth can also be inhibited. At present, the main dosage forms of clopyralid are water aqua, soluble granules, soluble powder and the like.
Herbicide varieties containing a single active ingredient often have various degrees of defects in agricultural pest control, such as: the weeding spectrum is narrow, the weeds are easy to generate drug resistance after continuous use, and the environmental pollution is aggravated by a plurality of times of use. The proper compound herbicide has the positive characteristics of strong complementarity, obvious synergistic effect, prevention and treatment spectrum expansion, application amount reduction, pesticide application period prolongation, high safety to crops, environmental pollution reduction and the like, and if the active ingredients are not properly selected, the problems of antagonism, difficult exertion of preparation performance and the like can be easily generated after compounding, and the more the types of the compounded active ingredients are, the greater the difficulty in developing the preparation is. At present, most of the compositions are single-dose or binary compounds of related active components in the market, the ternary compound preparation is less, and related reports of 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid ternary compound compositions and dosage forms thereof are not found at present.
Disclosure of Invention
The invention aims to provide a composition containing 2-methyl-4-chloroisooctyl ester, fluroxypyr-meptyl ester and clopyralid, which combines the 2-methyl-4-chloroisooctyl ester, the fluroxypyr-meptyl ester and the clopyralid, and has unexpected and excellent weeding effect through experimental verification.
In order to achieve the purpose, the invention provides the following technical scheme:
the active ingredients of the composition are 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid, and the composition has a synergistic weeding effect by compounding the three components, can improve the weeding effect, can expand the weeding spectrum and can improve the safety of crops. The mass ratio of the 4-methyl-chloroisooctyl ester, fluroxypyr-meptyl ester and clopyralid is 10-30, such as 10.
Furthermore, the invention also provides a dispersible oil suspending agent which comprises effective components, wherein the effective components are the compound composition of the 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid.
Further, in the above dispersible oil suspension, the content of the effective ingredient is 5 to 50% by weight, for example, 5% by weight, 10% by weight, 15% by weight, 20% by weight, 25% by weight, 30% by weight, 35% by weight, 40% by weight, 45% by weight, 50% by weight, preferably 5 to 30% by weight.
Further, the 2-methyl-4-chloroisooctyl ester is yellow to brown yellow liquid, and the melting point is-48 ℃; the raw material drug of fluroxypyr meptyl is white or white-like powder, and the melting point is 56-57 ℃; the clopyralid technical product is yellow or light yellow powder, the melting point is 151 ℃, and the logP value is-2.63. 2 methyl 4 chloro isooctyl, fluroxypyr iso-octyl have higher lipophilicity, and fluroxypyr iso-octyl melting point is lower, and fluroxypyr iso-octyl appears creaming or recrystallization easily in sanding or hot storage process, and clopyralid hydrophilicity is strong, and these 3 active ingredients when making dispersible oil suspending agent, appear layering easily, the problem such as oil separating, poor stability has influenced the performance of active ingredient performance. Aiming at the problem, the inventor researches and experiments an auxiliary agent system of the dispersible oil suspending agent according to the characteristics of the three medicinal active ingredients, selects an emulsifier, a dispersant, a thickener and a dispersing medium as auxiliary agents, greatly reduces the processing difficulty of the dispersible oil suspending agent and improves the stability of the dispersible oil suspending agent by the synergistic matching of the auxiliary agents, particularly the synergistic matching of the emulsifier, the dispersant and the thickener, so that the obtained dispersible oil suspending agent has the advantages of good emulsifying dispersibility, high suspension rate, difficult layering or oil precipitation, difficult creaming or recrystallization and good heat storage stability, effectively solves or reduces the problems of creaming or recrystallization, layering, oil precipitation, poor heat storage stability and the like of the preparation, and is more favorable for the exertion of the medicinal effect.
Furthermore, in the dispersible oil suspending agent, the weight percentage of the effective components and the auxiliary agents are as follows: 5-50% of active ingredients, 5-20% of emulsifier, 1-6% of dispersant, 1-8% of thickener and 100% of dispersion medium.
Further, the emulsifier is one or more of castor oil polyoxyethylene ether, polyoxyethylene sorbitan monooleate, styrylphenol polyoxyethylene ether, calcium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and dodecylbenzene sulfonate isopropylamine salt.
Further, the dispersant is one or more of polyoxyethylene-polyoxypropylene block copolymer, calcium lignosulfonate and alkyl naphthalene sulfonate formaldehyde condensate.
Further, the thickener is one or more of fumed silica, organic bentonite, attapulgite and urea.
Furthermore, the dispersion medium is one or more of soybean oil, methyl oleate, castor oil and soybean oil methyl ester, and the dispersion medium used in the invention is an environment-friendly solvent, so that the environment is protected, the compatibility of the components is good, and the stability of the product is improved.
Preferably, in the dispersible oil suspending agent, the emulsifier is formed by mixing castor oil polyoxyethylene ether and calcium dodecyl benzene sulfonate 5363 in a mass ratio of 3-6:1; the dispersant is formed by mixing an alkyl naphthalene sulfonate formaldehyde condensate and a polyoxyethylene-polyoxypropylene segmented copolymer according to the mass ratio of 1:1-2; the thickener is formed by mixing fumed silica and organic bentonite according to the mass ratio of 1-4:1; the dispersion medium is methyl oleate. The optimization of the auxiliary agents is more beneficial to the optimization of the performance of the preparation and the exertion of the drug effect of the active ingredients, and especially, the optimization of the emulsifying agent, the dispersing agent and the thickening agent has better promotion effect on the performance and the exertion of the drug effect of the preparation.
Further, the above dispersible oil suspension contains 5 to 50wt%, for example, 5wt%, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, 50wt% of the pharmaceutically active ingredient.
Further, in the above dispersible oil suspension, the emulsifier is contained in an amount of 5 to 20% by weight, for example, 5%, 10%, 14%, 17%, 20%.
Further, in the above dispersible oil suspension agent, the dispersant is contained in an amount of 1 to 6% by weight, for example, 1%, 2%, 3%, 4%, 5%, 6% by weight.
Further, in the above dispersible oil suspension, the thickener is contained in an amount of 1 to 8% by weight, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%.
Further, the invention also provides a preparation method of the dispersible oil suspending agent, which comprises the following steps: uniformly mixing and dispersing a dispersion medium, an emulsifier and a dispersant, then adding a thickening agent, fluroxypyr-meptyl and clopyralid, fully shearing and uniformly mixing, and then grinding the mixture to a particle size D 90 And (3) less than 4 mu m, finally adding 2-methyl-4-chloroisooctyl ester, and homogenizing to obtain the dispersible oil suspending agent.
Furthermore, in the preparation method, the shearing speed is 1000-10000r/min, the full mixing and emulsification can be quickly realized at the shearing speed, the time spent on the higher the shearing speed is shorter, and the shearing time is generally 10-30 minutes.
Further, in the preparation method, 2-methyl-4-chloro-isooctyl ester and other materials are fully and uniformly mixed by homogenization, and the homogenization time is generally 30-40 minutes.
Further, in the above-mentioned production method, the grinding may be carried out by any grinding method disclosed in the prior art, for example, grinding may be carried out under zirconia bead grinding media. After grinding, detecting by using a laser particle size distribution instrument until the particle size D 90 Less than 4 μm.
The invention also provides application of the composition containing 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid or the dispersible oil suspending agent thereof in preventing and controlling weeds. The invention has wider application period on cereal crops, can be used for preventing and killing broad-leaved weeds in wheat, barley, corn, grapes, orchards, pastures, forest lands and the like, and the broad-leaved weeds comprise chenopodium quinoa, cleavers, convolvulus, shepherd's purse, amaranthus retroflexus, chickweed, amaranthus curlicutus, purslane, acalypha australis, descurainia sophia and the like.
The invention has the following beneficial effects:
1. the composition not only expands the weeding spectrum, but also can realize complementary synergism, improves the weeding effect, reduces the product dosage, reduces the cost, improves the safety to crops, and has the characteristics of synergism, drug resistance delay and the like.
2. The invention provides a dispersible oil suspending agent formulation of 2-methyl-4-chloroisooctyl ester, fluroxypyr-meptyl ester and clopyralid, wherein oil auxiliary agents with good adhesion and spreadability are selected as dispersing and diluting carriers and are easily adhered to waxy or smooth leaf surfaces, so that the dispersible oil suspending agent has the advantages of good adhesion and spreadability, strong permeation conductivity, strong rain wash resistance and the like when in use. The dispersible oil suspending agent has no dust in the production and use processes, uses the environment-friendly solvent oil, is not easy to pollute the environment and people and livestock, and has better drug effect and stronger environmental compatibility compared with the conventional emulsifiable solution, water aqua and other dosage forms.
3. According to the invention, by selecting the auxiliary agent, the emulsifying dispersibility, the suspension rate and the stability of the dispersible oil suspending agent are improved, and the obtained dispersible oil suspending agent has the advantages of good emulsifying dispersibility, high suspension rate, difficulty in layering or oil separation, difficulty in creaming or recrystallization and good thermal storage stability, effectively solves or reduces the problems of poor creaming or recrystallization, layering, oil separation, thermal storage stability and the like of the preparation, and is more beneficial to the exertion of the drug effect.
4. The invention further improves the performance of the dispersible oil suspending agent by optimizing the components of the auxiliary agent, the residue of the dispersible oil suspending agent after pouring can be lower than 1.0%, the suspension rate can reach more than 99%, the oil precipitation and agglomeration are avoided after thermal storage, the suspension rate is still more than 96%, and the dispersible oil suspending agent has excellent performance.
5. The dispersible oil suspending agent disclosed by the invention is simple in preparation process and simple and convenient to operate, and the prepared dispersible oil suspending agent is excellent in index performance, can resist different water qualities such as C water, D water and 3WHO water, meets the use requirements of different countries and regions, and is beneficial to large-scale popularization and application.
6. The compound composition of 2-methyl-4-chloroisooctyl ester, fluroxypyr and clopyralid or the dispersible oil suspending agent thereof has good application prospect in the aspect of preventing and controlling weeds such as wheat, barley, corn, grapes, orchards, pastures, forests and the like, and can effectively prevent and kill broad-leaved weeds such as quinoa, cleavers, convolvulus, capsella bursa-pastoris, amaranthus retroflexus, chickweed, amaranthus curlicutus, purslane, acalypha australis, descurainia sophia herb, vetch and the like.
Detailed Description
The present invention will be further explained with reference to specific examples, but the gist of the present invention is not limited to the following examples.
Example 1 indoor virulence assay
The weeding synergistic effect of the 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and the clopyralid adopts an indoor toxicity determination method. Indoor toxicity measurement is carried out according to the Sun Yunpei method, the cotoxicity coefficient (CTC) of the compounded medicament according to a certain proportion is determined, the CTC is less than 80 and is antagonistic, the CTC is more than or equal to 80 and is less than or equal to 120 and is additive, and the CTC is more than 120 and is synergistic.
The test agents were provided by Shandong Weifang Runfeng Feng chemical company Limited.
And (3) experimental design: after the effective inhibition concentration range of each medicament is determined through pre-test, each medicament is respectively treated with a series of concentrations according to the content of effective components, and clear water is used for comparison. Referring to herbicide in agricultural chemical laboratory bioassay test criteria, the inhibiting medium concentration of the pesticide and the mixed herbicide is determined by stem leaf spray, and the co-toxicity coefficient is obtained by a method for calculating the combined toxicity provided by Sun Yunpei et al (1960).
The calculation formula is as follows (2-methyl-4-chloro-isooctyl ester is taken as a standard medicament, and the virulence index is 100)
Toxicity Index (TI) = ED of 2-methyl-4-chloroisooctyl fluroxypyr 50 ED of fluroxypyr meptyl ester 50 ×100。
Toxicity Index (TI) = ED of 2 methyl 4 chloro isooctyl ester of clopyralid 50 ED of clopyralid 50 ×100。
Actual virulence index (ATI) = ED of 2 methyl 4 chloroisooctyl ester of M 50 ED of/M 50 ×100。
Theoretical virulence index (TTI) =2 formazan of M4 Chloroisoctyl ester TI XP 2-methyl-4-chloro-isooctyl ester + fluroxypyr meptyl ester TI XP Fluroxypyr meptyl ester + dichloropyridic acid TI XP Clopyralid acid 。
In the formula: m is a mixture of 2-methyl-4-chloroisooctyl ester, fluroxypyr-meptyl ester and clopyralid in different proportions;
P 2-methyl-4-chloro-isooctyl ester Is the proportion of 2-methyl-4-chloro-isooctyl ester in the compound composition;
P fluroxypyr meptyl ester The proportion of fluroxypyr meptyl in the compound composition;
P clopyralid acid Is the proportion of the clopyralid in the compound composition.
The test results are shown in table 1:
TABLE 1 toxicity test results of combinations of methyl 4-chloro-isooctyl ester, fluroxypyr-meptyl ester and clopyralid on Chenopodium quinoa
As can be seen from Table 1, the ED of 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid for Chenopodium quinoa 50 141.33mg/L, 75.85mg/L and 50.98mg/L, respectively. When the mass ratio of 2 m 4 chloroisooctyl ester, fluroxypyr-meptyl ester and clopyralid is 10When the mass ratio of the isooctyl acetate to the clopyralid is 8. Wherein the mass ratio of 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid is 26.
Example 2
A dispersible oil suspending agent has a formula shown in table 2, and comprises the following components in percentage by weight: 5.3% of effective components, 4% of castor oil polyoxyethylene ether serving as an emulsifier, 1% of calcium dodecyl benzene sulfonate, 1% of polyoxyethylene-polyoxypropylene block copolymer serving as a dispersant, 8% of fumed silica serving as a thickener and 100% of castor oil serving as a dispersion medium, wherein the effective components are a mixture of 2-methyl-4-chloroisooctyl ester, fluroxypyr-meptyl ester and clopyralid in a mass ratio of 4.8.
The preparation method of the dispersible oil suspending agent comprises the following steps: adding a dispersion medium, an emulsifier and a dispersant into a reaction kettle, and fully mixing and uniformly dispersing; adding thickener, fluroxypyr-meptyl ester and clopyralid into a reaction kettle under the high-speed shearing state of 1000-5000r/min, shearing for 10-30 minutes, and then grinding until the particle diameter D of the mixture is reached 90 And (3) less than 4 mu m, finally adding 2-methyl-4-chloroisooctyl, and homogenizing for 30-40 minutes to obtain the dispersible oil suspending agent.
Examples 3 to 10 and comparative example 1
A series of dispersible oil suspensions were formulated according to the formulation in table 2, each oil suspension being prepared according to the method of example 2.
TABLE 2 dispersible oil suspension formulation (wt%)
Test examples Performance test
The properties of the dispersible oil suspensions prepared in the above examples and comparative examples were measured, and the results are shown in table 3 below. Wherein, the suspension percentage is detected according to a method for measuring the suspension percentage of the pesticide GB/T14825-2006, the pourability is detected according to a method for measuring the pourability of the pesticide GB/T31737-2015, the dispersion stability is detected according to CIPAC MT 180, namely the measurement of the dispersion stability of the suspoemulsion, of the International Committee for pesticide analysis Cooperation, and the heat storage stability is detected according to a method for measuring the heat storage stability of the pesticide GB/T19136-2003.
TABLE 3 dispersible oil suspension Properties
As can be seen from Table 3, in examples 2 to 10, the preparation maintained the preferable properties within the range of 5 to 50% of the active ingredient content of the drug. Among them, the products of examples 3, 4, 5, and 6 using the preferred aid are stable in quality before and after hot storage, maintain high suspension percentage, low pouring residue, and good dispersion stability, and do not bleed oil after hot storage, while the products of examples 2, 7 to 10 using non-preferred aids are slightly inferior in dispersion stability and hot storage stability to those of examples 3 to 6, but are excellent in performance, while comparative example 1 has poor dispersion stability of the formulation, low suspension percentage, and greatly reduced stability after hot storage due to improper selection of the emulsifier, dispersant, and thickener, and has more bleed oil, and also has a problem of bleeding after hot storage.
Field test example: field test corn field annual broadleaf weed pesticide effect test
The experiment is arranged in suburb farmland in the mountainous region of the Weifang city of Shandong province, the terrain is flat, the land is flat, irrigation and drainage facilities are complete, the field management level is consistent, and the fertility is uniform and medium. The corn is sowed in 10 days 6 months in 2020, the cultivation mode is direct seeding, and the main weeds in the test field are amaranthus retroflexus, crab grass, purslane, barnyard grass, chenopodium album, acalypha australis and the like.
Spraying stem and leaf at the 4-5 leaf stage of corn. The pesticide is applied for 1 time by a worker-farm-16 knapsack manual sprayer, 450kg of water is added to prepare liquid medicine according to the dosage of the preparation per hectare, and the liquid medicine is uniformly sprayed according to the amount of the liquid medicine in a community. Random block arrangement is adopted, 4 times of repetition are carried out, and the area of a cell is 30m 2 . The test period is good in weather, no rain exists on the day of application, and no rain falls within 10 days after application. The total of 5 treatments are respectively as follows: treatment 1: spraying clear water, and blank control; and (3) treatment 2: dispersible oil suspensions of examples 4, 7 and comparative example 1; and (3) treatment: 85wt% of 2-methyl-4-chloroisooctyl ester emulsifiable concentrate; and (4) treatment: 200g/L fluroxypyr-meptyl ester missible oil; and (4) treatment 5:30wt% of clopyralid water agent.
The dispersible oil suspending agents of examples 4 and 7 and comparative example 1 were subjected to stem and leaf spraying treatment according to the effective component dosage of 350 g/hectare, the treatment 3 was subjected to stem and leaf spraying treatment according to the effective component dosage of 750 g/hectare, the treatment 4 was subjected to stem and leaf spraying treatment according to the effective component dosage of 150 g/hectare, and the treatment 5 was subjected to stem and leaf spraying treatment according to the effective component dosage of 225 g/hectare.
30 days after the application, the fresh weight control effect of each treatment on weeds and the safety of each treatment on corn are investigated. The results are shown in Table 4.
The method for investigating the fresh weight control effect of the weeds comprises the following steps:
30 days after the application, 4 points are randomly selected from each cell, and each point is 0.25m 2 And (4) removing annual broad-leaved weeds, classifying and weighing fresh weight of the weeds, and calculating the control effect of the fresh weight of the weeds.
TABLE 4 results of the efficacy test of annual broadleaf weeds in corn fields for each treatment agent
The test results in the table show that the compound of 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid has good control effect on annual broadleaf weeds in corn fields, and the control effect of the example 4 using the preferred auxiliary agent is obviously better than that of the example 7, the comparative example 1 and the control agent, and shows synergistic effect. As can be seen from the comparison of the drug effects of the examples and the comparative examples, the selection of the auxiliary agent has an important influence on the exertion of the active ingredients, and improper selection of the auxiliary agent can influence the compounding effect of the 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid.
In addition, according to the whole-course observation of field experiments, the corn field grows well within the range of the experimental dosage, and no phytotoxicity phenomenon appears, which indicates that the compound pesticide has no phytotoxicity to the corn.
Claims (10)
1. A composition characterized by: the active ingredients are 2-methyl-4-chloroisooctyl, fluroxypyr-meptyl and clopyralid, and the mass ratio of the 2-methyl-4-chloroisooctyl, the fluroxypyr-meptyl and the clopyralid is 10-30.
2. The composition as set forth in claim 1, characterized in that: the mass ratio of the 2-methyl-4-chloroisooctyl ester to the fluroxypyr-meptyl ester to the clopyralid is 26.
3. A dispersible oil suspension, characterized by: comprising an active ingredient which is the composition of claim 1 or 2.
4. The dispersible oil suspension concentrate of claim 3, consisting of the following components in weight percent: 5-50% of active ingredients, 5-20% of emulsifier, 1-6% of dispersant, 1-8% of thickener and 100% of dispersion medium.
5. The dispersible oil suspension of claim 4, wherein: the emulsifier is one or more of castor oil polyoxyethylene ether, polyoxyethylene sorbitan monooleate, styrylphenol polyoxyethylene ether, calcium dodecylbenzene sulfonate, fatty alcohol polyoxyethylene ether and dodecyl benzene sulfonate isopropylamine salt; the dispersing agent is one or more of polyoxyethylene-polyoxypropylene block copolymer, calcium lignosulfonate and alkyl naphthalene sulfonate formaldehyde condensate; the thickening agent is one or more of fumed silica, organic bentonite, attapulgite and urea; the dispersion medium is one or more of soybean oil, methyl oleate, castor oil and soybean oil methyl ester.
6. The dispersible oil suspension of claim 5, wherein: the emulsifier is formed by mixing castor oil polyoxyethylene ether and calcium dodecyl benzene sulfonate 5363 in a mass ratio of 3-6:1; the dispersant is formed by mixing an alkyl naphthalene sulfonate formaldehyde condensate and a polyoxyethylene-polyoxypropylene segmented copolymer according to the mass ratio of 1:1-2; the thickener is formed by mixing fumed silica and organic bentonite according to the mass ratio of 1-4:1; the dispersing medium is methyl oleate.
7. A process for preparing a dispersible oil suspension concentrate as claimed in any one of claims 3 to 6, characterized by comprising the steps of: uniformly mixing and dispersing a dispersion medium, an emulsifier and a dispersant, then adding a thickening agent, fluroxypyr-meptyl and clopyralid, fully shearing and uniformly mixing, and then grinding the mixture to a particle size D 90 And (5) adding 2-methyl-4-chloroisooctyl ester into the mixture, and homogenizing the mixture to obtain the dispersible oil suspending agent, wherein the particle size of the dispersible oil suspending agent is smaller than 4 mu m.
8. The method for preparing a polycarbonate resin composition according to claim 8, wherein: the shearing speed is 1000-10000r/min.
9. Use of the composition of claim 1 or 2, the dispersible oil-suspension agent of any one of claims 3-7 for controlling weeds.
10. Use according to claim 9, characterized in that: the weeds are weeds in wheat fields, barley fields, corn fields, orchard fields, pastures and forest farms, and the weeds are broadleaf weeds; preferably, the weeds are chenopodium quinoa, cleavers, convolvulus, capsella bursa-pastoris, amaranthus retroflexus, chickweed, amaranthus curlicue, purslane, acalypha australis, descurainia sophia and vicia ariifolia.
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