Modified insecticide coated with heat-resistant resin, and preparation method and use

Abstract

The present application relates to the technical field of insecticides, and in particular to a modified insecticide coated with a heat-resistant resin, and a preparation method and a use. In the modified insecticide coated with the heat-resistant resin provided by the present application, an insecticide is first doped into a thermoplastic resin, so as to use the thermoplastic resin to reduce the impact of external heat on the stability of the insecticide; and then the thermoplastic resin doped with the insecticide is coated with a thermosetting resin, so as to use a double-layer structure having an inner thermoplastic resin layer and an outer thermosetting resin layer to improve the thermal stability of the insecticide. The present application solves the technical problem of lack of heat-resistant insecticides in the prior art.

Description

Heat-resistant resin-coated modified insecticide and preparation method and application thereof TECHNICAL FIELD

[0001] The present application belongs to the technical field of insecticides, and particularly relates to a heat-resistant resin-coated modified insecticide and a preparation method and application thereof. BACKGROUND

[0002] People in production and life will be harmed by various pests, for example, buildings inside and outside the city will be invaded by termites, and after the invasion, the termites grow and reproduce in the buildings to form termite colonies. The termite colonies spit out chemical substances such as formic acid to corrode and bite structures such as boards, pipelines, wires, cables, and reinforced concrete in the buildings, causing damage to the building structure.

[0003] Imidacloprid is a kind of insecticide with broad-spectrum, high efficiency, low toxicity, and low residue. By embedding imidacloprid and other insecticides in the building, termites and other pests can be prevented and controlled, the harm of termites and other pests can be reduced, and the safety of buildings inside and outside the city can be improved. However, the environment of different buildings is different. The environmental temperature of conventional residential buildings is not high, while the environmental temperature of some buildings, such as power stations, chemical plants, and substations, is relatively high. The temperature will affect the activity of imidacloprid and other insecticides. Under high temperature, the chemical properties of imidacloprid and other insecticides change, and the insecticidal activity decreases or even inactivates. Therefore, the effect of embedding imidacloprid and other insecticides in power stations, chemical plants, and substations to prevent and control termites is not good. At the same time, the safety requirement of power stations, chemical plants, and substations is relatively high. Once the termite corrosion and biting cause damage to the building structure, it is easy to cause serious accidents and huge economic losses.

[0004] Although a new insecticide with good thermal stability can be developed to replace imidacloprid and other insecticides to reduce the harm of termites and other pests in high-temperature environment buildings and provide reliable protection for high-temperature environment buildings, the development of a new insecticide with good thermal stability requires a long time and higher cost, and is not suitable for large-scale popularization and use. In addition to using a new insecticide with good thermal stability, improving the heat resistance of existing insecticides is a more inexpensive and efficient method, which is conducive to large-scale popularization and use. However, there is currently a lack of research on improving the heat resistance of existing insecticides, and there are not many new insecticides with good thermal stability. Therefore, there is currently a lack of insecticides with good thermal stability. SUMMARY

[0005] Therefore, the present application provides a heat-resistant resin-coated modified insecticide and a preparation method and application thereof to solve the technical problem of the lack of heat-resistant insecticides in the prior art.

[0006] The first aspect of the present application provides a heat-resistant resin-coated modified insecticide, which comprises insecticide, thermoplastic resin, and thermosetting resin.

[0007] the insecticide is doped in the thermoplastic resin;

[0008] the thermosetting resin coats the thermoplastic resin.

[0009] Preferably, the particle size of the modified insecticide coated by the heat-resistant resin is 5-30 μm.

[0010] Preferably, in the modified insecticide coated by the heat-resistant resin, 1-10 parts by mass of the insecticide, 20-30 parts by mass of the thermoplastic resin, and 60-70 parts by mass of the thermosetting resin are included.

[0011] Preferably, in the modified insecticide coated by the heat-resistant resin, the thermoplastic resin is selected from at least one of polycarbonate, semi-aromatic nylon, polyarylate, polyphenylene ether, and polyphenylsulfone.

[0012] Preferably, in the modified insecticide coated by the heat-resistant resin, the thermosetting resin is selected from at least one of phenol resin, cyanate ester resin, methyl silicone resin, phenyl silicone resin, and bismaleimide resin.

[0013] Preferably, in the modified insecticide coated by the heat-resistant resin, the insecticide is selected from at least one of imidacloprid, bifenthrin, abamectin, thiamethoxam, and thiacloprid.

[0014] The second aspect of the present application provides a preparation method of the modified insecticide coated by the heat-resistant resin, which can prepare the modified insecticide coated by the heat-resistant resin of the first aspect, and the preparation method comprises the following steps:

[0015] Step S1, dissolving the thermoplastic resin and the insecticide in an organic solvent to obtain a mixed solution of the insecticide and the thermoplastic resin;

[0016] Step S2, evaporating the mixed solution of the insecticide and the thermoplastic resin by heating to remove the organic solvent and obtain the thermoplastic resin doped with the insecticide;

[0017] Step S3, uniformly stirring the thermoplastic resin doped with the insecticide, the crosslinking agent, and the thermosetting resin monomer liquid to obtain the modified insecticide precursor coated by the heat-resistant resin;

[0018] Step S4, crosslinking and curing the modified insecticide precursor coated by the heat-resistant resin to obtain the modified insecticide coated by the heat-resistant resin.

[0019] Preferably, after Step S2 and before Step S3, the method further comprises the following step:

[0020] Step S2a, crushing the thermoplastic resin coated with the insecticide;

[0021] After Step S4, the method further comprises the following step:

[0022] Step S4a, crushing the heat-resistant resin-coated modified insecticide.

[0023] Preferably, in step S1, the mass ratio of the thermoplastic resin and the insecticide is 17-19: 1-3.

[0024] In step S3, the mass ratio of the thermoplastic resin doped with insecticide and the monomer liquid of the thermosetting resin is 0.5-1: 2-4.

[0025] Preferably, in step S2, the temperature of the heated evaporation is 40-80℃, and the time is 12-36h.

[0026] Preferably, in step S4, the temperature of the cross-linking and curing is 20-40℃, and the time is 4-12h.

[0027] Preferably, in step S1, the organic solvent is selected from at least one of N,N-dimethylformamide, N-methylpyrrolidone, toluene, dichloromethane, chloroform, dimethylacetamide, tetrahydrofuran, ethanol, dimethyl sulfoxide, diphenyl ether, diphenyl sulfide.

[0028] In step S3, the cross-linking agent is selected from at least one of p-phenylenediamine, tetrahydrophthalic anhydride, phthalic anhydride, benzene anhydride, silane coupling agent KH550, butyl titanate, triethylenetetramine.

[0029] Preferably, in step S3, the stirring process further comprises adding a defoaming agent.

[0030] The defoaming agent is selected from at least one of polymethylsiloxane, tributyl phosphate, polyoxypropylene glycerol, polyoxyethylene oxypropylene glycerol, octadecanol.

[0031] The third aspect of the present application provides the use of the heat-resistant double-layer resin-coated modified insecticide of the first aspect in the field of insecticides.

[0032] In summary, the present application provides a heat-resistant resin-coated modified insecticide, a preparation method and an application. The heat-resistant resin-coated modified insecticide provided by the present application comprises an insecticide, a thermoplastic resin and a thermosetting resin. After the thermoplastic resin and the insecticide are mixed and dissolved, the thermoplastic resin is formed, and a thermoplastic resin doped with an insecticide is obtained. Then, the thermoplastic resin doped with the insecticide and the monomer of the thermosetting resin are mixed, and the monomer of the thermosetting resin is cross-linked and cured, so that the thermosetting resin coats the thermoplastic resin doped with the insecticide. The use of the double-layer structure of the inner thermoplastic resin and the outer thermosetting resin weakens the adverse effects of external heat on the insecticide, greatly improves the stability of the insecticide, and solves the technical problem of the lack of heat-resistant insecticides in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the accompanying drawings required to be used in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0034] Fig. 1 is an infrared spectrum of a heat-resistant resin-coated modified insecticide provided by the present application;

[0035] Fig. 2 is an electron microscope image of a heat-resistant resin-coated modified insecticide provided by the present application;

[0036] Fig. 3 is a thermal stability result graph of a heat-resistant resin-coated modified insecticide provided by the present application. DETAILED DESCRIPTION

[0037] The present application provides a heat-resistant resin-coated modified insecticide and a preparation method and application, which are used to solve the technical problem of the lack of heat-resistant insecticides in the prior art.

[0038] The technical solutions of the present application will be described clearly and completely in combination with the accompanying drawings. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort are within the scope of protection of the present application.

[0039] In view of the defect of the lack of insecticides with good thermal stability at present, the present application provides a heat-resistant resin-coated modified insecticide. The composition and structure of the heat-resistant resin-coated modified insecticide provided by the present application include: insecticide, thermoplastic resin and thermosetting resin; the insecticide is doped in the thermoplastic resin to obtain insecticide-modified thermoplastic resin, and the thermosetting resin is coated on the thermoplastic resin to obtain heat-resistant resin-coated modified insecticide; the thermal stability analysis result shows that after the insecticide is doped in the thermoplastic resin, the insecticide can utilize the thermoplastic resin to weaken the direct action of external heat on the insecticide, and the thermal stability of the insecticide is improved. On this basis, after the thermosetting resin is further coated on the thermoplastic resin, the double-layer structure of the inner thermoplastic resin and the outer thermosetting resin weakens the adverse effects of external heat on the insecticide, and the stability of the insecticide is greatly improved. The heat-resistant resin-coated modified insecticide provided by the present application is beneficial to reducing the harm of termites and other pests in high-temperature environment buildings, and provides reliable protection for high-temperature environment buildings, overcoming the defect of the lack of insecticides with good thermal stability at present.

[0040] As preferred, the size of the heat-resistant resin coated modified insecticide provided by the present application is preferably micron size, and further preferably 5-30 μm; the micron size heat-resistant resin coated modified insecticide can be better dispersed and filled into the gaps of the building, thereby preventing the termites from breeding and growing in the building and providing protection for the building.

[0041] Meanwhile, as to the specific types of the components in the heat-resistant resin coated modified insecticide provided by the present application, the inner layer thermoplastic resin is selected from at least one of polycarbonate, semi-aromatic nylon, polyarylate, polyphenyl ether and polyphenyl sulfone, the outer layer thermosetting resin is selected from at least one of phenolic resin, cyanate ester resin, methyl silicone resin, phenyl silicone resin and bismaleimide resin, and the insecticide is selected from at least one of imidacloprid, bifenthrin, abamectin, thiamethoxam and thiacloprid.

[0042] As preferred, the present application further provides a preparation method of the heat-resistant resin coated modified insecticide; the preparation method first selects to dissolve the thermoplastic resin such as polycarbonate and the insecticide in the organic solvent, then evaporates the organic solvent to make the thermoplastic resin and the insecticide precipitate and form, and the reformed thermoplastic resin can uniformly dope the insecticide; then the doped insecticide thermoplastic resin, the thermosetting resin monomer (such as phenolic epoxy resin) and the crosslinking agent (p-phenylenediamine) are mixed and crosslinked and cured, so that the thermosetting resin is coated on the surface of the doped insecticide thermoplastic resin.

[0043] As preferred, the present application further provides the usage amount of the reactants in the preparation method, wherein the mass ratio of the thermoplastic resin and the insecticide is 17-19:1-3, and in this usage amount ratio, the insecticide can be better dispersed and doped in the thermoplastic resin; and the mass ratio of the doped insecticide thermoplastic resin and the thermosetting resin monomer is 0.5-1:2-4, and in this usage amount ratio, the thermosetting resin can more completely coat the doped insecticide thermoplastic resin.

[0044] The heat-resistant resin coated modified insecticide provided by the present application will be specifically described below in combination with the examples and experimental examples.

[0045] Example 1

[0046] The present application provides a preparation method of the heat-resistant resin coated modified insecticide, which comprises the steps of configuring an insecticide / thermoplastic resin mixed solution, preparing a doped insecticide thermoplastic resin, crushing the thermoplastic resin, configuring a heat-resistant resin coated insecticide precursor solution, coating the doped insecticide thermoplastic resin, and crushing the heat-resistant resin coated modified insecticide.

[0047] The step of configuring the insecticide / thermoplastic resin mixed solution includes: adding 15 g of imidacloprid into a mixing stirrer containing 400 ml of dichloromethane, stirring at a speed of 400 r / min for 3 min, so that the imidacloprid is fully dissolved in the dichloromethane, to obtain an imidacloprid solution, then adding 85 g of polycarbonate into the imidacloprid solution, stirring at a speed of 600 r / min for 8 h, so that the polycarbonate is fully dissolved, to obtain the insecticide / thermoplastic resin mixed solution.

[0048] The step of preparing the thermoplastic resin doped with the insecticide includes: stirring at a speed of 400 r / min for 12 h, with the temperature controlled at 40℃, so that the dichloromethane solvent is evaporated, and finally placing in an oven for 24 h, so that the dichloromethane solvent is thoroughly volatilized, to obtain the solid thermoplastic resin doped with the insecticide.

[0049] The step of crushing the thermoplastic resin includes: adding the solid thermoplastic resin doped with the insecticide into a mechanical crusher, and crushing at a speed of 28000 r / min for 0.5 h, to obtain the powder-shaped thermoplastic resin doped with the insecticide.

[0050] The step of configuring the heat-resistant resin coated insecticide precursor solution includes: adding 30 g of the powder-shaped thermoplastic resin doped with the insecticide into 63 g of phenolic epoxy resin, and fully stirring, so that the powder-shaped thermoplastic resin doped with the insecticide is uniformly dispersed, then adding 0.63 g of polymethylsiloxane, 15.79 g of p-phenylenediamine, and stirring uniformly, to obtain the heat-resistant resin coated insecticide precursor solution.

[0051] The step of coating the thermoplastic resin doped with the insecticide includes: placing the heat-resistant resin coated insecticide precursor solution at 30℃ for 8 h, to obtain the heat-resistant resin coated modified insecticide.

[0052] The step of crushing the heat-resistant resin coated modified insecticide includes: adding the heat-resistant resin coated modified insecticide into a mechanical crusher, and crushing at a speed of 25000 r / min for 1 h, to obtain the powder-shaped heat-resistant resin coated modified insecticide.

[0053] Example 2

[0054] The example 2 of the present application provides a preparation method of the heat-resistant resin coated modified insecticide, the preparation method includes the steps of configuring the insecticide / thermoplastic resin mixed solution, preparing the thermoplastic resin doped with the insecticide, crushing the thermoplastic resin, configuring the heat-resistant resin coated insecticide precursor solution, coating the thermoplastic resin doped with the insecticide, and crushing the heat-resistant resin coated modified insecticide.

[0055] The step of configuring the insecticide / thermoplastic resin mixed solution comprises: adding 20 g of imidacloprid into a mixing stirrer containing 500 ml of dichloromethane, stirring at a speed of 500 r / min for 4 min, so that the imidacloprid is fully dissolved in the dichloromethane, to obtain an imidacloprid solution, then adding 80 g of polycarbonate into the imidacloprid solution, stirring at a speed of 600 r / min for 8 h, so that the polycarbonate is fully dissolved, to obtain the insecticide / thermoplastic resin mixed solution.

[0056] The step of preparing the thermoplastic resin doped with the insecticide comprises: stirring at a speed of 400 r / min for 12 h, with the temperature controlled at 40℃, so that the dichloromethane solvent is evaporated, and finally placing in an oven for 24 h, with the temperature of the oven being 85℃, so that the dichloromethane solvent is completely volatilized, to obtain the solid thermoplastic resin doped with the insecticide.

[0057] The step of crushing the thermoplastic resin comprises: adding the solid thermoplastic resin doped with the insecticide into a mechanical crusher, and crushing at a speed of 28000 r / min for 1 h, to obtain the powder-shaped thermoplastic resin doped with the insecticide.

[0058] The step of configuring the insecticide precursor solution coated with the heat-resistant resin comprises: adding 35 g of the powder-shaped thermoplastic resin doped with the insecticide into 63 g of phenolic epoxy resin, and fully stirring, so that the powder-shaped thermoplastic resin doped with the insecticide is uniformly dispersed, then adding 0.63 g of polymethylsiloxane, 15.79 g of p-phenylenediamine, and stirring uniformly, to obtain the insecticide precursor solution coated with the heat-resistant resin.

[0059] The step of coating the thermoplastic resin doped with the insecticide comprises: placing the insecticide precursor solution coated with the heat-resistant resin at 30℃ for 8 h, to obtain the modified insecticide coated with the heat-resistant resin.

[0060] The step of crushing the modified insecticide coated with the heat-resistant resin comprises: adding the modified insecticide coated with the heat-resistant resin into a mechanical crusher, and crushing at a speed of 25000 r / min for 1 h, to obtain the powder-shaped modified insecticide coated with the heat-resistant resin.

[0061] Example 3

[0062] The example 3 of the present application provides a preparation method of the modified insecticide coated with the heat-resistant resin, and the preparation method comprises the steps of configuring the insecticide / thermoplastic resin mixed solution, preparing the thermoplastic resin doped with the insecticide, crushing the thermoplastic resin, configuring the insecticide precursor solution coated with the heat-resistant resin, coating the thermoplastic resin doped with the insecticide, and crushing the modified insecticide coated with the heat-resistant resin.

[0063] The step of configuring the insecticide / thermoplastic resin mixed solution comprises: adding 205 g of imidacloprid into a mixing stirrer containing 500 ml of N-methyl pyrrolidone, stirring at a speed of 400 r / min for 4 min, so that the imidacloprid is fully dissolved in dichloromethane, to obtain an imidacloprid solution, then adding 80 g of polyphenylene oxide into the imidacloprid solution, and stirring at a speed of 600 r / min for 8 h, so that the polycarbonate is fully dissolved, to obtain the insecticide / thermoplastic resin mixed solution.

[0064] The step of preparing the thermoplastic resin doped with insecticide comprises: stirring at a speed of 500 r / min for 15 h, with the temperature controlled at 180℃, so that the N-methyl pyrrolidone is evaporated, and finally placing in an oven for 24 h, with the temperature of the oven being 80℃, so that the N-methyl pyrrolidone solvent is completely volatilized, to obtain the solid thermoplastic resin doped with insecticide.

[0065] The step of crushing the thermoplastic resin comprises: adding the solid thermoplastic resin doped with insecticide into a mechanical crusher, and crushing at a speed of 28000 r / min for 1 h, to obtain the powder-shaped thermoplastic resin doped with insecticide.

[0066] The step of configuring the insecticide precursor solution coated with heat-resistant resin comprises: adding 35 g of the powder-shaped thermoplastic resin doped with insecticide into 63 g of phenolic epoxy resin, and fully stirring, so that the powder-shaped thermoplastic resin doped with insecticide is uniformly dispersed, then adding 0.63 g of polymethylsiloxane, 15.79 g of p-phenylenediamine, and stirring uniformly, to obtain the insecticide precursor solution coated with heat-resistant resin.

[0067] The step of coating the thermoplastic resin doped with insecticide comprises: placing the insecticide precursor solution coated with heat-resistant resin at 30℃ for 8 h, to obtain the modified insecticide coated with heat-resistant resin.

[0068] The step of crushing the modified insecticide coated with heat-resistant resin comprises: adding the modified insecticide coated with heat-resistant resin into a mechanical crusher, and crushing at a speed of 25000 r / min for 1 h, to obtain the powder-shaped modified insecticide coated with heat-resistant resin.

[0069] Experimental Example 1

[0070] The structural and performance tests of the modified insecticide coated with heat-resistant resin, the thermoplastic resin doped with insecticide, and imidacloprid provided in Experimental Example 1 of the present application are performed.

[0071] The infrared spectrum test result of the modified insecticide coated with heat-resistant resin provided in Example 1 is shown in FIG. 1, and it can be seen from FIG. 1 that the modified insecticide coated with heat-resistant resin provided in Example 1 of the present application has absorption peaks at 1435 cm -1 , 1573 cm -1, 3357 cm -1 The C=N, N-NO2, N-H and other characteristic peaks appear at 3357 cm-1, which indicates that the heat-resistant resin coated modified insecticide provided in the application includes imidacloprid, polycarbonate, phenolic epoxy and other components, and the preparation method provided in the application successfully prepares the heat-resistant resin coated modified insecticide.

[0072] The scanning electron microscope test result of the heat-resistant resin coated modified insecticide provided in Example 1 is shown in FIG. 2, and it can be seen from FIG. 2 that the particle size of the heat-resistant resin coated modified insecticide prepared in Example 1 is about 5-30 μm.

[0073] The thermal stability test result of the heat-resistant resin coated modified insecticide provided in Example 1, the thermoplastic resin doped with insecticide and imidacloprid is shown in FIG. 3, and it can be seen from FIG. 3 that the thermal decomposition temperature of imidacloprid is 240 / 288°C, and the thermal stability is poor, while the thermal decomposition temperature of the thermoplastic resin doped with insecticide is 260 / 295°C, which indicates that the insecticide is filled in the thermoplastic resin, and the influence of external heat on the insecticide can be weakened by using the thermoplastic resin, and the thermal decomposition temperature of the heat-resistant resin coated modified insecticide provided in Example 1 is 279°C / 322°C, and the thermal stability is greatly improved, which indicates that the heat-resistant resin coated modified insecticide provided in Example 1 can improve the thermal stability of the insecticide by using the double-layer structure of the inner thermoplastic resin and the outer thermosetting resin; at the same time, the thermal stability improvement method of the insecticide provided in the application is not only suitable for imidacloprid, but also suitable for imidacloprid, bifenthrin, abamectin, thiamethoxam and thiacloprid.

[0074] The above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A heat-resistant resin-coated modified insecticide, characterized by comprising: 1) a modified insecticide, The application relates to a heat-resistant resin-coated modified insecticide. The insecticide is doped in the thermoplastic resin. The thermosetting resin coats the thermoplastic resin. The particle size of the heat-resistant resin-coated modified insecticide is 5-30 microns.

2. The heat resistant resin coated modified insecticide according to claim 1, wherein, The heat-resistant resin-coated modified insecticide comprises 1-10 mass parts of insecticide, 20-30 mass parts of thermoplastic resin and 60-70 mass parts of thermosetting resin.

3. The heat resistant resin coated modified insecticide as claimed in claim 1, wherein, The thermoplastic resin in the heat-resistant resin-coated modified insecticide is at least one selected from polycarbonate, semi-aromatic nylon, polyarylate, polyphenyl ether and polyphenyl sulfone.

4. The heat resistant resin coated modified insecticide as claimed in claim 1, wherein, The thermosetting resin in the heat-resistant resin-coated modified insecticide is at least one selected from phenolic resin, cyanate ester resin, methyl silicone resin, phenyl silicone resin and bismaleimide resin.

5. The heat resistant resin coated modified insecticide as claimed in claim 1, wherein, The insecticide in the heat-resistant resin-coated modified insecticide is at least one selected from imidacloprid, bifenthrin, abamectin, thiamethoxam and thiacloprid.

6. The heat resistant resin coated modified insecticide as claimed in claim 1, wherein, The application further discloses a preparation method of the heat-resistant resin-coated modified insecticide.

7. A process for the preparation of a heat resistant resin coated modified insecticide as claimed in any one of claims 1 to 6, characterized in that, Step S1: dissolving the thermoplastic resin and the insecticide in an organic solvent to obtain an insecticide / thermoplastic resin mixed solution; Step S2: evaporating and removing the organic solvent to obtain the thermoplastic resin doped with the insecticide; Step S3: uniformly stirring the thermoplastic resin doped with the insecticide, a crosslinking agent and a thermosetting resin monomer liquid to obtain a heat-resistant resin-coated insecticide precursor; Step S4: crosslinking and curing the heat-resistant resin-coated insecticide precursor to obtain the heat-resistant resin-coated modified insecticide. After step S2 and before step S3, the method further comprises the following step:

8. The process for preparing a heat resistant resin coated modified insecticide as claimed in claim 7, wherein, Step S2a: crushing the thermoplastic resin coated with the insecticide; After step S4, the method further comprises the following step: Step S4a: crushing the heat-resistant resin-coated modified insecticide. In step S1, the mass ratio of the thermoplastic resin to the insecticide is 17-19:1-3.

9. The process for preparing heat resistant resin coated modified insecticide as claimed in claim 7, wherein, In step S3, the mass ratio of the thermoplastic resin doped with the insecticide to the thermosetting resin monomer liquid is 0.5-1:2-4.

10. Application of the heat-resistant double-layer resin-coated modified insecticide in the field of insecticide. ​

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