A high-efficiency insecticidal smoke composition, its preparation method and application

Abstract

The present application relates to the field of agricultural pesticides, in particular to a high-efficiency pesticide smoke agent composition, a preparation method and application thereof, solves the problem that different pesticides have different heat resistance, and the pesticide with poor heat resistance is easily affected by fuel when used in combination, thereby losing part of the activity, and the adhesion of the smoke agent is poor in an environment with high humidity, and the effect of preventing pests is poor due to the influence of ventilation, comprising 55-65 parts by weight of a heat supply agent and 20-30 parts by weight of a composite intercalation main agent, the composite intercalation main agent is composed of a nanosheet material, an active main agent and a smoke generating aid, the heat supply agent is composed of a stearate, a strong oxygen supply agent, a fuel and a smoke generating aid, and the strong oxygen supply agent is one of potassium perchlorate, potassium dichromate and sodium dichloroisocyanurate. When different pesticides with different heat resistance are used in combination, the present application can ensure good smoke effect while ensuring pesticide activity, and improve the adhesion of the pesticide smoke agent particles, which is not easily affected by ventilation and other operations.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural insecticidal technology, in particular to a high-efficiency insecticidal smoke agent composition, a preparation method and application thereof. BACKGROUND

[0002] The insecticidal smoke agent composition is generally composed of a main agent containing an effective ingredient and a heating agent. The main agent is generally a pesticide raw material with biological activity, and the heating agent is composed of an oxidizing agent, a fuel and an auxiliary agent. The auxiliary agent is the main component of the smoke agent, which forms the heating agent part of the smoke agent with the fuel. The smoke forming auxiliary agent can promote the formation of smoke of the pesticide effective ingredient and assist its drift or settlement. Related research has found that the smoke forming auxiliary agent can improve the smoke forming rate of the smoke agent, thereby indirectly improving the drug efficacy. The effective ingredient of the drug and the carrier smoke form aerosol particles, thereby adhering to the surface of the target object.

[0003] However, the existing quick-acting smoke agent has the problems of easy drift due to small particles, high humidity in the greenhouse, the need for ventilation to control humidity, and the inability to effectively remain for a long time, resulting in unsatisfactory control effect and poor adhesion to the surface of the biological body. Therefore, a large amount of drug is lost when the smoke agent is ventilated and dehumidified, causing interruption of the control.

[0004] The existing preparation methods of the smoke agent include a direct mixing method, a separation method and a layering method. The direct mixing method is suitable for pesticides that are stable in nature and do not react with the heating agent. The separation method is suitable for pesticides that are liquid at room temperature and have low vapor pressure. The layering method is suitable for low-melting-point waxy or solid pesticides that are flammable and decomposable. However, the layering method has poor dispersion effect and control effect due to poor contact between the smoke forming auxiliary agent and the fuel. In addition, the electrostatic dispersion between particles and the settlement phenomenon are poor.

[0005] Moreover, when the composite smoke agent for multiple pests is used, different pesticides have different temperature stabilities and cannot be well volatilized. Therefore, single use is required to remove certain pests, resulting in slow prevention speed and unsatisfactory effect. Some drugs have poor stability, and the smoke temperature needs to be reduced and the smoke time needs to be shortened. SUMMARY

[0006] In order to solve the problem that different pesticides have different heat resistance, and the pesticide with poor heat resistance is easily affected by fuel and loses part of activity when used in combination, and the smoke agent has poor adhesion in a larger humidity environment and is easily affected by ventilation to cause poor pest control effect, the application provides a high-efficiency insecticidal smoke agent composition and a preparation method thereof.

[0007] The high-efficiency insecticidal smoke agent composition is characterized in that the composition is composed of 55-65 parts by weight of a heat-providing agent and 20-30 parts by weight of a composite intercalation main agent, wherein the composite intercalation main agent is composed of a nanosheet material, an active main agent and a smoke-producing auxiliary agent, the heat-providing agent is composed of a stearate, a strong oxygen-providing agent, a fuel and a smoke-producing auxiliary agent, the active main agent is composed of 4-(trifluoromethyl)nicotinamide, pyrethrin and pyridaben, and the strong oxygen-providing agent is one of potassium perchlorate, potassium dichromate and sodium dichloroisocyanurate;

[0008] The preparation steps of the composite intercalation main agent are as follows:

[0009] The nanosheet material is obtained by mechanically crushing the sheet material, the active main agent is dispersed in an organic solution to form a treatment liquid, the crushed nanosheet material is placed in the treatment liquid for ultrasonic treatment and heating operation, and finally drying and washing are performed to obtain a dried precursor, then the precursor is soaked in a solution of the smoke-producing auxiliary agent, the solvent is removed and dried to obtain the composite intercalation main agent.

[0010] The application reduces the influence of temperature on the active drug by using the composite intercalation main agent, in the process of preparing the composite intercalation main agent, the pyrethrin and pyridaben are physically and chemically adsorbed on the sheet plane of the graphene by using the special structure and properties of the nanosheet material, and then stably exist between the nanosheet materials under the action of van der Waals force and hydrogen bond, so as to facilitate the storage and release of the subsequent drug, and the nanosheet material effectively separates the high temperature of the fuel and the active drug, the jet-shaped smoke formed by the fuel and the smoke-producing auxiliary agent releases the nanosheet material, and the smoke-producing auxiliary agent outside the nanosheet material is gasified after being affected by heat energy, so as to form a secondary dispersion effect on the nanosheet material and the drug main agent, thereby ensuring that the subsequent released drug normally kills insects, and improving the insecticidal effect of different stability drugs.

[0011] The application can greatly improve the smoke yield by using stearate and strong oxygen donors potassium perchlorate, potassium dichromate and sodium dichloroisocyanurate, so that the nano composite sheet material and the main drug agent can be released in the form of spraying, achieving better dispersion effect. In addition to providing small solid particles during the smoking process, stearate also enhances the adhesion of the composite intercalation main agent to the plant surface, preventing the loss of drugs due to air flow.

[0012] The 4-(trifluoromethyl)nicotinamide used in the application is a metabolite of flonicamid, which has insecticidal activity and can effectively control mosquitoes, cotton aphids, whiteflies and brown planthoppers.

[0013] Preferably, the stearate is one of calcium stearate, zinc stearate or magnesium stearate, and the smoke aid is ammonium chloride or naphthalene.

[0014] Calcium stearate has the highest viscosity, zinc stearate has the largest smoke yield, and magnesium stearate is moderate.

[0015] Preferably, the component ratio of the stearate, strong oxygen donor, fuel and smoke aid is 1-2:2-3:5:3 by weight.

[0016] The application controls the content of stearate to achieve the best level of smoking effect. Too much stearate will result in larger smoke particles and too fast settling speed, and too little stearate will not have obvious smoking effect, and the composite intercalation main agent cannot be effectively dispersed.

[0017] Preferably, the component ratio of 4-(trifluoromethyl)nicotinamide, pyrethrin and pyridaben in the active main agent is 2:2-5:1-3 by weight.

[0018] Preferably, the nano sheet material in the preparation step of the composite intercalation agent is one of graphene, mica, silicon nanosheet or hexagonal boron nitride.

[0019] Preferably, the weight ratio of the nano sheet material to the active main agent in the composite intercalation main agent is 10:3-7, and the smoke aid in the composite intercalation main agent accounts for 25% of the total smoke aid.

[0020] Preferably, the organic solvent is one of ethanol, petroleum ether or methanol, and the solvent in the smoke aid solution is one of water, ethanol, methanol or petroleum ether.

[0021] In the application, if ammonium chloride is used as the smoke aid, water is used for dissolution, and if naphthalene is used as the smoke aid, ethanol, methanol or petroleum ether is used as the solvent.

[0022] The application also provides a preparation method of the high-efficiency insecticidal smoke agent composition, and the specific preparation steps are as follows:

[0023] S1, 75% by weight of the smoke aid is mixed with 4-(trifluoromethyl) nicotinamide into powder A, then the fuel is ground and fried to anhydrous state, the fuel is mixed with powder A to obtain powder B, and powder B is placed at the bottom of the cylindrical barrel and compacted;

[0024] S2, prepare the pyrethrin into a composite intercalation main agent, and mix with the corresponding stearate and strong oxygen donor into powder C, which is placed on the upper part of powder B;

[0025] S3, prepare the pyridaben into a composite intercalation main agent, and mix with the corresponding stearate and strong oxygen donor, and place it on the upper part of powder C, and compacted to obtain the high-efficiency insecticidal smoke agent composition.

[0026] In the preparation of the insecticidal smoke agent, the mixing method and the layering method are used at the same time, which not only ensures the efficient dispersion of pyrethrin and pyridaben, but also further preserves their biological activity and enhances the killing effect.

[0027] Preferably, the fuel is one of wood chips, coal powder or wood powder starch.

[0028] The high-efficiency insecticidal smoke agent composition of the present application can be applied to indoor greenhouses and forest environments with high water content.

[0029] The beneficial effects of the present application are:

[0030] The present application uses nanosheet material to sandwich the drug main agent, thereby preventing the direct contact of the drug preparation with the fuel and oxidizing agent and other aids, and forming a layer of smoke aid outside by means of dissolution and drying, thereby helping the release of the drug main agent in the nanosheet material. The large composite nanosheet material requires a larger spraying effect, so the present application uses the combination of stearate and strong oxidizing agent to form a large amount of smoke, thereby better spraying the composite intercalation main agent and making it more uniformly dispersed, thereby achieving a more killing effect and stabilizing the properties of the active main agent.

[0031] The present application sandwiches the low ignition point active main agent between the layers of nanosheet material, and then coats the smoke agent ammonium chloride on the outside, so that the ammonium chloride sprays the layered graphite, and then the low ignition point drug is dispersed in the air again, thereby protecting the drug properties and enhancing the insecticidal effect of the drug. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The line graph of the killing rate of the insecticidal examples and comparative examples of the present application. DETAILED DESCRIPTION

[0033] The following will be described with reference to the accompanying drawings Figure 1Detailed description of the embodiments of the present application is made. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0034] Preparation Example 1

[0035] Preparation of the composite intercalation masterbatch

[0036] 10 parts of graphene are prepared into nanometer graphene with a thickness of 10-30 nm and a number of layers of 10-100 layers by ball milling;

[0037] Then, 3 parts by weight of pyrethrum and 2 parts by weight of pyridaben are respectively dissolved using ethanol to obtain a pyrethrum treatment solution and a pyridaben treatment solution, and the amount of organic solvent is just enough to dissolve;

[0038] Then, the nanometer graphene is divided into two parts according to a weight ratio of 3:2, and is respectively placed in the pyrethrum treatment solution and the pyridaben treatment solution for heating and ultrasonic treatment, the ultrasonic power is 200 W, and then the organic solvent is removed by heating and drying, and the nanometer graphene is washed with cold water and dried with hot air to obtain a pyrethrum precursor and a pyridaben precursor;

[0039] 5 parts of ammonium chloride are placed in water to immerse the pyrethrum precursor and the pyridaben precursor to form a dissolution solution, and then the pyrethrum precursor and the pyridaben precursor are respectively placed in the dissolution solution according to the corresponding weight ratio for soaking, and the solution is slowly removed by heating to obtain a composite intercalation masterbatch.

[0040] Preparation Example 2

[0041] Preparation of the composite intercalation masterbatch

[0042] 10 parts of mica are prepared into nanometer mica sheets with a thickness of 100-200 nm and a number of layers of 40-200 layers by ball milling;

[0043] Then, 2 parts by weight of pyrethrum and 1 part by weight of pyridaben are respectively dissolved using petroleum ether to obtain a pyrethrum treatment solution and a pyridaben treatment solution, and the amount of organic solvent is just enough to dissolve;

[0044] Then, the nanometer mica sheets are divided into two parts according to a weight ratio of 2:1, and are respectively placed in the pyrethrum treatment solution and the pyridaben treatment solution for heating and ultrasonic treatment, the ultrasonic power is 200 W, and then the organic solvent is removed by heating and drying, and the nanometer mica sheets are washed with cold water and dried with hot air to obtain a pyrethrum precursor and a pyridaben precursor;

[0045] 5 parts of naphthalene is placed in ethanol, which can submerge pyrethrum precursor and pyridaben precursor, to form a dissolving solution, and then the pyrethrum precursor and pyridaben precursor are respectively placed in the dissolving solution with the corresponding weight ratio, and the solution is slowly removed by heating to obtain the composite intercalation main agent.

[0046] Preparation Example 3

[0047] Preparation of the composite intercalation main agent

[0048] 15 parts of silicon nanosheets are prepared into silicon nanosheets with a thickness of 20-60 nm and a sheet number of 30-180 layers by ball milling;

[0049] Then 6 parts of pyrethrum and 4 parts of pyridaben are respectively dissolved in methanol to obtain pyrethrum treatment solution and pyridaben treatment solution, and the amount of organic solvent is just enough to dissolve;

[0050] Then the silicon nanosheets are divided into two parts according to the weight ratio of 6:4, and are respectively placed in the pyrethrum treatment solution and the pyridaben treatment solution, and are then heated and ultrasonically treated, with an ultrasonic power of 200 W. The organic solvent is removed by heating and drying, and then the silicon nanosheets are washed with cold water and dried with hot air to obtain pyrethrum precursor and pyridaben precursor.

[0051] 5 parts of ammonium chloride is placed in water, which can submerge pyrethrum precursor and pyridaben precursor, to form a dissolving solution, and then the pyrethrum precursor and pyridaben precursor are respectively placed in the dissolving solution with the corresponding weight ratio, and the solution is slowly removed by heating to obtain the composite intercalation main agent.

[0052] Preparation Example 4--without using nanosheet layer material to sandwich active main agent

[0053] Preparation of the composite intercalation main agent

[0054] Then 3 parts of pyrethrum and 3 parts of pyridaben are respectively dissolved in ethanol to obtain pyrethrum treatment solution and pyridaben treatment solution, and the amount of organic solvent is just enough to dissolve;

[0055] Then the pyrethrum treatment solution and the pyridaben treatment solution are heated and ultrasonically treated, with an ultrasonic power of 200 W. The organic solvent is removed by heating and drying to obtain pyrethrum precursor and pyridaben precursor.

[0056] 5 parts of ammonium chloride or naphthalene is placed in water, ethanol, methanol or petroleum ether, which can submerge pyrethrum precursor and pyridaben precursor, to form a dissolving solution, and then the pyrethrum precursor and pyridaben precursor are respectively placed in the dissolving solution with the corresponding weight ratio, and the solution is slowly removed by heating to obtain the composite intercalation main agent.

[0057] Preparation Example 5 - Coating of precursor without using smoke aid

[0058] Preparation of composite intercalation masterbatch

[0059] 12 parts of graphene is prepared into nanometer graphene with thickness of 10-30 nm and sheet number of 10-100 layers by ball milling pulverization;

[0060] Then 4 parts of pyrethrin and 2 parts of pyridaben are respectively dissolved by using ethanol to obtain pyrethrin treatment liquid and pyridaben treatment liquid, and the amount of organic solvent is just enough to dissolve;

[0061] Then the nanometer graphene is divided into two parts according to the weight ratio of 4:2, and is respectively placed in the pyrethrin treatment liquid and the pyridaben treatment liquid for heating and ultrasonic treatment, the ultrasonic power is 200 W, and then the organic solvent is removed by heating and drying, and the nanometer graphene is washed with cold water and dried with hot air to obtain the composite intercalation masterbatch.

[0062] Preparation Example 6 - Dissolving active masterbatch without using organic solvent

[0063] Preparation of composite intercalation masterbatch

[0064] 13 parts of graphene is prepared into nanometer graphene with thickness of 10-30 nm and sheet number of 10-100 layers by ball milling pulverization;

[0065] 3 parts of pyrethrin and 3 parts of pyridaben are respectively mixed with 1:1 weight ratio of nanometer graphene to obtain pyrethrin precursor and pyridaben precursor;

[0066] 5 parts of ammonium chloride or naphthalene is placed in water, ethanol, methanol or petroleum ether to form a dissolution solution, and the pyrethrin precursor and the pyridaben precursor are respectively placed in the dissolution solution with corresponding weight ratio for soaking, and the solution is slowly removed by heating to obtain the composite intercalation masterbatch.

[0067] Example 1

[0068] Preparation of a high-efficiency insecticidal smoke agent composition

[0069] S1, 15 parts of ammonium chloride or naphthalene is mixed with 2 parts of 4-(trifluoromethyl) nicotinamide to form powder A, and then 25 parts of wood chips, coal powder or wood flour starch is ground and pulverized and fried to be water-free, and the wood chips, coal powder or wood flour starch is mixed with powder A to obtain powder B, and powder B is placed at the bottom of the cylindrical barrel and compacted;

[0070] S2, pyrethrin complex intercalation main agent in preparation example 1 is mixed with 5 parts of stearate, 7 parts of strong oxygen supplier to form powder C, which is placed on the upper part of powder B;

[0071] S3, pyridaben complex intercalation main agent in preparation example 1 is mixed with corresponding 3 parts of stearate, 5 parts of strong oxygen supplier, and then placed on the upper part of powder C, and a high-efficiency insecticidal smoke agent composition is obtained after compaction.

[0072] Example 2

[0073] Preparation of a high-efficiency insecticidal smoke agent composition

[0074] S1, 15 parts of ammonium chloride or naphthalene is mixed with 2 parts of 4-(trifluoromethyl)nicotinamide to form powder A, then 25 parts of wood chips, coal powder or wood powder starch is ground and fried to a water-free state, the wood chips, coal powder or wood powder starch is mixed with powder A to obtain powder B, and powder B is placed at the bottom of the cylindrical barrel and compacted;

[0075] S2, pyrethrin complex intercalation main agent in preparation example 2 is mixed with 3 parts of stearate, 6 parts of strong oxygen supplier to form powder C, which is placed on the upper part of powder B;

[0076] S3, pyridaben complex intercalation main agent in preparation example 1 is mixed with corresponding 2 parts of stearate, 4 parts of strong oxygen supplier, and then placed on the upper part of powder C, and a high-efficiency insecticidal smoke agent composition is obtained after compaction.

[0077] Example 3

[0078] Preparation of a high-efficiency insecticidal smoke agent composition

[0079] S1, 15 parts of ammonium chloride or naphthalene is mixed with 2 parts of 4-(trifluoromethyl)nicotinamide to form powder A, then 25 parts of wood chips, coal powder or wood powder starch is ground and fried to a water-free state, the wood chips, coal powder or wood powder starch is mixed with powder A to obtain powder B, and powder B is placed at the bottom of the cylindrical barrel and compacted;

[0080] S2, pyrethrin complex intercalation main agent in preparation example 3 is mixed with 5 parts of stearate, 8 parts of strong oxygen supplier to form powder C, which is placed on the upper part of powder B;

[0081] S3, pyridaben complex intercalation main agent in preparation example 1 is mixed with corresponding 5 parts of stearate, 7 parts of strong oxygen supplier, and then placed on the upper part of powder C, and a high-efficiency insecticidal smoke agent composition is obtained after compaction.

[0082] Comparative example 1

[0083] Preparation of a high-efficiency insecticidal smoke agent composition

[0084] S1, 15 parts by weight of ammonium chloride or naphthalene is mixed with 2 parts by weight of 4-(trifluoromethyl)nicotinamide into powder A, then 25 parts by weight of wood chips are ground and fried to a water-free state, and the wood chips are mixed with powder A to obtain powder B, and powder B is placed at the bottom of the cylindrical barrel and compacted;

[0085] S2, the pyrethrin complex intercalation main agent in Preparation Example 4 is mixed with 5 parts of stearate and 7 parts by weight of strong oxygen supplier into powder C, which is placed on the upper part of powder B;

[0086] S3, the pyridaben complex intercalation main agent in Preparation Example 1 is mixed with corresponding 3 parts of stearate and 5 parts by weight of strong oxygen supplier, and then placed on the upper part of powder C, and after compaction, a high-efficiency insecticidal smoke agent composition is obtained.

[0087] Comparative Example 2

[0088] Preparation of a high-efficiency insecticidal smoke agent composition

[0089] S1, 15 parts by weight of ammonium chloride or naphthalene is mixed with 2 parts by weight of 4-(trifluoromethyl)nicotinamide into powder A, then 25 parts by weight of wood chips, coal powder or wood powder starch are ground and fried to a water-free state, and the wood chips, coal powder or wood powder starch are mixed with powder A to obtain powder B, and powder B is placed at the bottom of the cylindrical barrel and compacted;

[0090] S2, the pyrethrin complex intercalation main agent in Preparation Example 5 is mixed with 3 parts of stearate and 6 parts by weight of strong oxygen supplier into powder C, which is placed on the upper part of powder B;

[0091] S3, the pyridaben complex intercalation main agent in Preparation Example 1 is mixed with corresponding 2 parts of stearate and 4 parts by weight of strong oxygen supplier, and then placed on the upper part of powder C, and after compaction, a high-efficiency insecticidal smoke agent composition is obtained.

[0092] Comparative Example 3

[0093] Preparation of a high-efficiency insecticidal smoke agent composition

[0094] S1, 15 parts by weight of ammonium chloride or naphthalene is mixed with 2 parts by weight of 4-(trifluoromethyl)nicotinamide into powder A, then 25 parts by weight of wood chips, coal powder or wood powder starch are ground and fried to a water-free state, and the wood chips, coal powder or wood powder starch are mixed with powder A to obtain powder B, and powder B is placed at the bottom of the cylindrical barrel and compacted;

[0095] S2, the pyrethrin complex intercalation main agent in Preparation Example 6 is mixed with 5 parts of stearate and 8 parts by weight of strong oxygen supplier into powder C, which is placed on the upper part of powder B;

[0096] S3, pyridaben complex intercalation main agent in preparation example 1 is mixed with corresponding 5 parts of stearate and 7 parts of strong oxygen donor, and then is placed on the upper part of powder C, and after compaction, a high-efficiency insecticidal smoke agent composition is obtained.

[0097] Comparative example 4 - not using the layering method

[0098] Preparation of a high-efficiency insecticidal smoke agent composition

[0099] S1, 15 parts of ammonium chloride or naphthalene is mixed with 2 parts of 4- (trifluoromethyl) nicotinamide to form powder A, and then 25 parts of wood chips, coal powder or wood powder starch is ground and fried to a water-free state, and the wood chips, coal powder or wood powder starch is mixed with powder A to obtain powder B;

[0100] S2, the pyrethrin complex intercalation main agent in preparation example 1 is mixed with 5 parts of stearate and 7 parts of strong oxygen donor to form powder C;

[0101] S3, the pyridaben complex intercalation main agent in preparation example 4 is mixed with corresponding 3 parts of stearate and 5 parts of strong oxygen donor to obtain powder D, and powder B, C and D are mixed uniformly, and after compaction, a high-efficiency insecticidal smoke agent composition is obtained.

[0102] Comparative example 5 - not using stearate

[0103] Preparation of a high-efficiency insecticidal smoke agent composition

[0104] S1, 15 parts of ammonium chloride or naphthalene is mixed with 2 parts of 4- (trifluoromethyl) nicotinamide to form powder A, and then 25 parts of wood chips, coal powder or wood powder starch is ground and fried to a water-free state, and the wood chips, coal powder or wood powder starch is mixed with powder A to obtain powder B, and the powder B is placed at the bottom of the cylindrical barrel and compacted;

[0105] S2, the pyrethrin complex intercalation main agent in preparation example 1 is mixed with 7 parts of strong oxygen donor to form powder C, which is placed on the upper part of powder B;

[0106] S3, the pyridaben complex intercalation main agent in preparation example 1 is mixed with 5 parts of strong oxygen donor, and then is placed on the upper part of powder C, and after compaction, a high-efficiency insecticidal smoke agent composition is obtained.

[0107] Comparative example 6 - not using strong oxidizing agent

[0108] Preparation of a high-efficiency insecticidal smoke agent composition

[0109] S1, 15 parts by weight of ammonium chloride or naphthalene is mixed with 2 parts by weight of 4-(trifluoromethyl) nicotinamide into powder A, then 25 parts by weight of wood chips, coal powder or wood powder starch is ground and fried to a water-free state, the wood chips, coal powder or wood powder starch is mixed with powder A to obtain powder B, and powder B is placed at the bottom of the cylindrical barrel and compacted;

[0110] S2, the imidacoprid complex intercalation main agent in Preparation Example 1 is mixed with 5 parts of stearate into powder C, which is placed on the upper part of powder B;

[0111] S3, the pyridaben complex intercalation main agent in Preparation Example 1 is mixed with 3 parts of stearate and then placed on the upper part of powder C, and after compaction, a high-efficiency insecticidal smoke agent composition is obtained.

[0112] Experiments and data

[0113] The high-efficiency insecticidal smoke agent composition prepared in the above examples and comparative examples is tested for insecticidal mortality, residual insecticidal rate after ventilation, smoke volume and smoke forming speed, and the test methods are as follows:

[0114] Select a test field with a greenhouse, distribute aphids, whiteflies, spider mites and leaf rollers in it, and calculate the percentage of the number of dead insects to the total number after the release of the smoke agent to obtain the insecticidal mortality rate.

[0115] Select a test field with a greenhouse, distribute aphids, whiteflies, spider mites and leaf rollers in it, and then remove the dead insects after ventilation for 20 minutes, and continue to stand still to calculate the percentage of the number of dead insects to the total number.

[0116] The test results are shown in Table 1 below:

[0117] Table 1

[0118]

[0119]

[0120] The two mortality rates in Table 1 above are plotted as a line graph, as shown in Figure 1 .

[0121] Analysis

[0122] From the experimental data of Example 1, Example 2 and Example 3, it can be seen that the high-efficiency insecticidal smoke agent composition prepared in the examples has a high mortality rate in terms of comprehensive insecticidal effect, can effectively kill various pests, and still has a certain killing effect after ventilation. The stearic acid and strong oxidizing agent used have a fast smoke forming speed and a large smoke volume, and have good killing effect.

[0123] From the data of the comparative example 1 in Table 1, it can be seen that the comparative example 1 does not use nanosheet material to wrap the active main agent in the process of preparing the composite intercalation main agent, and the mortality rate before and after ventilation is poor. It can be known that the nanosheet material has a great influence on the activity of the active main agent, and the nanosheet material can effectively retain the biological activity of the active main agent, thereby improving the killing effect of the active main agent on pests.

[0124] From the data of the comparative example 2 in Table 1, it can be seen that the mortality rate of the comparative example 2 before and after ventilation is also low, and the smoke volume is small. The comparative example 2 does not use a smoke aid to coat the precursor. It can be known that coating the precursor with a smoke aid can improve the dispersion effect of the active main agent, thereby improving the insecticidal mortality rate.

[0125] From the data of the comparative example 3 in Table 1, it can be seen that the mortality rate of the comparative example 3 is also low, and similar to the comparative example 1, the comparative example 3 does not use an organic solvent to dissolve the active main agent and then combine it with the nanosheet material. Therefore, it can be known that dissolving by an organic solution can effectively make the active main agent located between the sheet materials, thereby achieving the purpose of protecting the active main agent by the sheet material, and further improving the insecticidal mortality rate.

[0126] From the experimental data of the comparative example 4 in Table 1, it can be seen that the mortality rate of the comparative example 4 before ventilation is the lowest, and the mortality rate after ventilation also decreases greatly. However, the pyrethrin and pyridaben of the comparative example 4 directly contact with the fuel, which can reduce the efficacy thereof. The large amount of smoke aid can greatly affect the active main agent. Therefore, a layered method is needed to prevent the direct contact between the smoke aid and the fuel, thereby effectively improving the insecticidal mortality rate.

[0127] From the experimental data of the comparative example 5 in Table 1, it can be seen that the mortality rate of the comparative example 5 before ventilation is high, but the mortality rate after ventilation is the worst, the smoke volume is low, and the smoke time is long. However, the comparative example 5 does not use stearate. It can be known that the presence of stearate can increase the smoke volume as a carbon source, and the adhesion effect of the active main agent is most significant. It has great resistance to ventilation and other factors, and can kill pests for a long time.

[0128] From the comparative example 6 in Table 1, it can be seen that the mortality rate of the comparative example 6 is low, the smoke volume is also low, and the combustion time is the longest. Therefore, it has a great influence on the active main agent. The comparative example 6 does not use a strong oxidizing agent. Therefore, in the combustion process, the stearate does not have a corresponding main agent to help it form small solid particles. Therefore, it cannot be sprayed in the air, and cannot be dispersed uniformly. Therefore, the killing effect is poor.

[0129] The technical scheme of the present application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical schemes after the changes or replacements will all fall within the protection scope of the present application.

Claims

1. A high efficiency insecticidal smoke composition, characterized by, The composition is composed of 55-65 parts by weight of a heat supply agent and 20-30 parts by weight of a composite intercalation main agent, wherein the composite intercalation main agent is composed of a nanosheet material, an active main agent and a smoke aid, the heat supply agent is composed of a stearate, a strong oxygen supply agent, a fuel and a smoke aid in a ratio of 1-2:2-3:5:3 by weight, the active main agent is composed of 4-trifluoromethyl nicotinamide, pyrethrin and pyridaben, and the strong oxygen supply agent is one of potassium perchlorate, potassium dichromate and sodium dichloroisocyanurate; The stearate is one of calcium stearate, zinc stearate or magnesium stearate, and the smoke aid is ammonium chloride or naphthalene; The nanosheet material is one of graphene, mica, silicon nanosheet or hexagonal boron nitride; The weight ratio of the nanosheet material to the active main agent in the composite intercalation main agent is 10:3-7, and the smoke aid in the composite intercalation main agent accounts for 25% of the total weight of the smoke aid; The preparation steps of the composite intercalation main agent are as follows: The nanosheet material is obtained by mechanically crushing the sheet material, then pyrethrin and pyridaben are dispersed in organic solvents respectively to form treatment liquids, the crushed nanosheet material is placed in the treatment liquids for ultrasonic treatment and heating operation, and finally drying and washing are performed to obtain dried pyrethrin and pyridaben precursors, then the pyrethrin and pyridaben precursors are respectively soaked in a solution of the smoke aid, the solvent is removed and dried to obtain pyrethrin and pyridaben composite intercalation main agents; The specific preparation steps of the high-efficiency insecticidal smoke agent composition are as follows: S1, 75% by weight of the smoke aid is mixed with 4-trifluoromethyl nicotinamide to form powder A, then the fuel is ground and crushed to a water-free state, the fuel is mixed with powder A to obtain powder B, and powder B is placed at the bottom of a cylindrical barrel and compacted; S2, after pyrethrin is prepared into a composite intercalation main agent, it is mixed with the corresponding stearate and strong oxygen supply agent to form powder C, which is placed on the upper part of powder B; S3, after pyridaben is prepared into a composite intercalation main agent, it is mixed with the corresponding stearate and strong oxygen supply agent, and then placed on the upper part of powder C, and compacted to obtain the high-efficiency insecticidal smoke agent composition.

2. A high efficiency insecticidal smoke composition according to claim 1, wherein The component ratio of 4-trifluoromethyl nicotinamide, pyrethrin and pyridaben in the active main agent is 2:2-5:1-3 by weight.

3. A high efficiency insecticidal smoke composition according to claim 1, wherein The organic solvent is one of ethanol, petroleum ether or methanol, and the solvent in the smoke aid solution is one of water, ethanol, methanol or petroleum ether.

4. A high efficiency insecticidal smoke composition according to any one of claims 1 to 3, wherein The smoke agent composition is applied to indoor greenhouses and forest environments with high water content.

5. A process for the preparation of a high efficiency insecticidal smoke composition as claimed in any one of claims 1 to 3, wherein, The specific preparation steps are as follows: S1, 75% by weight of the smoke aid is mixed with 4-trifluoromethyl nicotinamide to form powder A, then the fuel is ground and crushed to a water-free state, the fuel is mixed with powder A to obtain powder B, and powder B is placed at the bottom of a cylindrical barrel and compacted; S2, after pyrethrin is prepared into a composite intercalation main agent, it is mixed with the corresponding stearate and strong oxygen supply agent to form powder C, which is placed on the upper part of powder B; S3, pyridaben is prepared into a composite intercalation main agent, and is mixed with corresponding stearate and strong oxygen donor, and is placed in the upper part of the powder C to obtain a high-efficiency insecticidal smoke composition after compaction.

6. A process for the preparation of a high efficiency insecticidal smoke composition as claimed in claim 5, wherein, The fuel is one of wood chips, coal powder or wood powder starch.

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