A composition containing d-cyphenothrin and dinotefuran and a method for preparing the same

Abstract

The application relates to the field of insecticides, and particularly discloses a composition containing d-cyphenothrin and dinotefuran and a preparation method thereof, the composition containing d-cyphenothrin and dinotefuran and containing the following raw materials in parts by weight: d-cyphenothrin 5-10 parts, dinotefuran 5-10 parts, distilled water 80-120 parts, slow-release aid 20-40 parts, and surfactant 0.025-0.15 part; the preparation method is as follows: d-cyphenothrin, dinotefuran, distilled water, surfactant and slow-release aid are weighed and uniformly mixed and stirred to prepare a finished product composition; and the composition has the advantages of killing insects, repelling insects and long effective action time.

Description

Technical Field

[0001] This application relates to the field of insecticides, and more specifically, to a composition containing dextromethorphan and dinotefuran and a method for preparing the same. Background Technology

[0002] There are many pests in nature, such as mosquitoes, flies, cockroaches, termites, and fleas.

[0003] Mosquitoes are insects belonging to the family Culicidae in the order Diptera. There are more than 3,600 species. They easily transmit yellow fever, malaria, filariasis, and dengue fever. Mosquitoes have slender bodies covered with scales, long and thin legs that look fragile, and mouthparts inside their long proboscis. They are mainly used to suck the blood of humans and animals. The bite site is unbearably itchy and can easily cause inflammation.

[0004] Flies are insects that undergo complete metamorphosis. Although their lifespan is only about one month, their reproductive capacity is astonishing. According to statistics, a female fly can lay 500-1000 eggs, and a pair of flies can produce approximately 190 million offspring. Their eggs are laid in people's living environment and have an impact on people's lives.

[0005] Cockroaches, also known as roaches, can easily contaminate food and cause allergies when they come into contact with humans. They can also damage clothing, books, cabinets, and other items.

[0006] Termites are insects belonging to the family Termitidae in the order Termitoptera. Termites have a significant impact on sugarcane, an economic crop, and also cause considerable damage to wooden bookshelves, door frames, and office furniture. They can also easily undermine the stability of dams.

[0007] These insects not only affect people's lives but also easily impact the ecological environment. Currently, although there are many insecticides on the market, the insects will reappear after a period of time after each application of pesticides. Therefore, how to prepare an insecticidal composition that has the advantages of killing insects, repelling insects, and having a long effective duration is a problem that needs to be solved. Summary of the Invention

[0008] In order to prepare an insecticidal composition that simultaneously possesses the advantages of insecticidal, insecticidal, and long-lasting effective action, this application provides a composition containing dextrorotatory cypermethrin and fipronil, and a method for preparing the same.

[0009] In a first aspect, this application provides a composition containing dextrorotatory cypermethrin and fipronil, employing the following technical solution:

[0010] A composition containing dextromethorphan and fipronil comprises the following raw materials in parts by weight: 5-10 parts dextromethorphan, 5-10 parts fipronil, 80-120 parts distilled water, 20-40 parts slow-release adjuvant, and 0.025-0.15 parts surfactant.

[0011] By adopting the above technical solution, the combination of dextrorotatory cypermethrin and fipronil enables the composition to kill mosquitoes, flies, and termites. The addition of slow-release adjuvants prolongs the killing time of the composition on insects and extends the repellency time for mosquitoes, flies, and termites, thus giving the finished product a longer service life.

[0012] Preferably, the slow-release adjuvant is composed of an insecticidal adjuvant and a slow-release coating material in a mass ratio of 1:1-3.

[0013] By adopting the above technical solution, the insecticidal excipient and the slow-release coating material are combined. The coating effect of the slow-release coating material is used to extend the release time of the insecticidal excipient, thereby extending the insecticidal effect of the composition. Furthermore, by combining the insecticidal excipient, dextromethorphan, and fipronil, the efficiency of killing insects is improved, so that the composition still has a high killing rate against insects for a longer period of time.

[0014] Preferably, the insecticidal excipient is composed of peppermint oil, matrine, and eugenol in a mass ratio of 1:0.2-0.5:0.5-1.

[0015] By adopting the above technical solution, peppermint oil, matrine, and eugenol are combined. Matrine's water solubility facilitates dissolution in distilled water. First, dextrorotatory cypermethrin and fipronil are used to kill and repel mosquitoes, flies, and termites. Then, the combination of matrine and its insect egg-killing effect ensures that the material surface is free of both insects and insect eggs, preventing damage to the wood material. Finally, the scents of peppermint oil and eugenol repel mosquitoes, flies, termites, and other insects, while also killing insects that come into contact with them, extending the effect time of the composition on the material surface. This gives the composition the advantage of long-lasting insect killing and repellency.

[0016] Preferably, the peppermint oil is chitosan-coated peppermint oil.

[0017] By adopting the above technical solution, insects such as mosquitoes and termites are more likely to appear in humid environments, and wood is more easily damaged by termites and other insects in humid environments. By utilizing the hygroscopic effect of chitosan in peppermint oil, when the composition is sprayed onto the surface of wood materials, chitosan can easily absorb the moisture on the surface of the wood materials, reduce the surface humidity of the wood materials, and thus make the wood materials less susceptible to insect damage and extend the service life of the wood materials. In addition, with the slow release of peppermint oil in precipitated silica, the aroma of peppermint oil and its insecticidal effect give the material surface a long-lasting insecticidal and insect-repellent effect.

[0018] Preferably, the wall material of the chitosan-coated peppermint oil is chitosan quaternary ammonium salt, and the core material is peppermint oil.

[0019] By adopting the above technical solution, the coating of chitosan quaternary ammonium salt can prolong the volatilization time of peppermint oil, that is, prolong the effective action time of peppermint oil, thereby prolonging the effective action time of the composition.

[0020] The combination of chitosan quaternary ammonium salt and peppermint oil gives the wall material certain bactericidal and insecticidal effects. The gradually released peppermint oil also has certain bactericidal, insecticidal, and insect-repellent effects. Moreover, the chitosan quaternary ammonium salt is salt-soluble and easily absorbs water on the surface of damp wood, thus creating adhesion. This facilitates the adhesion of the chitosan-coated peppermint oil to the surface of damp wood, improving the bactericidal, insecticidal, and insect-repellent effects on the surface of wood materials in humid environments, and prolonging the effective action time of the composition on the surface of damp wood.

[0021] Preferably, the eugenol is eugenol used as a carrier for silica.

[0022] By adopting the above technical solution, in a humid environment, the absorption effect of precipitated silica on the moisture in wood materials can be utilized to further reduce the moisture content in the wood materials, thereby ensuring the service life of the wood materials. Moreover, eugenol, with its odor and its own active ingredients, has a certain insect repellent and insecticidal effect. Under the loading conditions of precipitated silica, eugenol can be slowly released, thereby prolonging the insect repellent and insecticidal effect of the composition.

[0023] Preferably, the eugenol carrier in the silica is obtained by modifying silica sequentially with eugenol and polyacrylamide.

[0024] By adopting the above technical solution, silica, eugenol, and polyacrylamide are combined. The porous structure and adsorption effect of silica facilitate the adsorption of eugenol, which is then sealed by polyacrylamide. The amide groups in polyacrylamide and the hydroxyl groups on the surface of silica facilitate adsorption and adhesion. When the silica-carrier eugenol comes into contact with other raw materials, the amide groups on the surface of the eugenol in silica facilitate adhesion to the amino and carboxyl groups on the surface of the chitosan-coated peppermint oil. This not only improves the compatibility of eugenol in the composition, but also, when sprayed onto a damp material surface, the polyacrylamide easily absorbs water and becomes sticky, facilitating the stable adhesion of the silica-carrier eugenol to the material surface and prolonging the insect-repellent and insecticidal effect on the material surface.

[0025] Preferably, the slow-release coating material is composed of modified sodium polyacrylate and isopropanol in a mass ratio of 1:3-5.

[0026] By adopting the above technical solution, modified sodium polyacrylate and isopropanol are combined. The dispersant properties of isopropanol facilitate the stable dispersion of raw materials in the composition and improve the compatibility of each raw material in the composition. Sodium polyacrylate has a slow water absorption and water-soluble effect. After being sprayed onto the surface of damp materials, the carboxyl groups in modified sodium polyacrylate, the amino and carboxyl groups on the surface of peppermint oil coated with chitosan, and the amide groups on the surface of eugenol in the silica carrier enhance the cross-linking effect of each raw material, forming a cross-linked network film. On the one hand, the barrier effect of the film allows the peppermint oil, eugenol and other raw materials in the composition to be released slowly, prolonging the action time of the composition. On the other hand, the film has good air permeability and a certain water-blocking effect, which can prevent moisture in the external environment from affecting the wood material again, thereby extending the service life of the wood material.

[0027] Preferably, the modified sodium polyacrylate is prepared by coating sodium polyacrylate with polyethyleneimine and gelatin.

[0028] By adopting the above technical solution, sodium polyacrylate, polyethyleneimine, and gelatin are combined. The cross-linking effect of the amino groups in polyethyleneimine and the hydroxyl groups in gelatin facilitates the coating of sodium polyacrylate. It also facilitates further cross-linking with the amide groups on the surface of eugenol, a carrier of silica, and the amino and carboxyl groups on the surface of peppermint oil coated with chitosan. This not only binds the peppermint oil and eugenol, allowing them to be released slowly, but also uses the film layer formed by cross-linking to block moisture from the external environment, preventing moisture from the external environment from contacting the wood material again. This prevents mosquitoes and termites from contacting the wood material again, thus ensuring the service life of the material.

[0029] Polyethyleneimine has a water-absorbing and adhesive effect. Combined with the water-absorbing and adhesive effects of chitosan quaternary ammonium salt and polyacrylamide, it improves the adhesion stability of the film layer on the material or wall surface. Sodium polyacrylate slowly dissolves in water, so the dextrorotatory cypermethrin and fipronil in the composition exert their insecticidal and insect-repellent effects first. Then, after the chitosan-coated peppermint oil and the eugenol carrier in the silica gradually absorb moisture, they can easily form a cross-linked network film layer with polyethyleneimine and sodium polyacrylate, sealing the components in the composition that have not yet volatilized. The air permeability of the cross-linked network film layer allows the odor of peppermint oil and eugenol to pass through and repel insects. Even when insects attach to the surface of the wood material, the unvolatilized components can still kill insects. The cross-linked network film layer also has a certain degree of water resistance, thus minimizing the contact between moisture from the external environment and the material surface.

[0030] Secondly, this application provides a method for preparing a composition containing dextrorotatory cypermethrin and fipronil, using the following technical solution:

[0031] A method for preparing a composition containing dextrorotatory cypermethrin and fipronil, comprising the following steps:

[0032] S1. Weigh out dextrorotatory cypermethrin, fipronil, distilled water, surfactant, and slow-release agent, mix and stir evenly to obtain the finished product composition.

[0033] By adopting the above technical solution, the finished product composition has good insecticidal and insect-repellent effects, and the effective action time is relatively long.

[0034] In summary, this application has the following beneficial effects:

[0035] 1. By combining dextrorotatory cypermethrin and fipronil, the composition is effective in killing mosquitoes, flies, and termites. With the addition of a slow-release adjuvant, the killing time of the composition on insects is extended, and the repellency time for mosquitoes, flies, and termites is also extended, thus giving the finished product a longer duration of action.

[0036] 2. Eugenol and peppermint oil are insoluble in water, while matrine is soluble in water. Therefore, peppermint oil that has been coated and eugenol that has been loaded with silica have good compatibility with distilled water during the preparation process. After preparation, they can be sprayed onto walls or wooden surfaces and their slow release gives the composition the advantages of long-lasting insect repellency and insecticidal properties.

[0037] 3. Moisture on the surface of damp wood materials is easily absorbed by the chitosan quaternary ammonium salt, silica, polyacrylamide, and sodium polyacrylate in the composition, reducing the surface humidity of the wood materials. As the composition is sprayed on the surface of the wood materials for a period of time, the raw materials such as chitosan quaternary ammonium salt, silica, polyacrylamide, sodium polyacrylate, and gelatin gradually absorb moisture and cross-link, which facilitates the formation of a network film. The breathability of the film facilitates the release of insect-repellent odors. Moreover, the film has a certain degree of waterproof and water-resistant properties, which can minimize the contact between the moisture in the external environment and the surface of the wood materials, thereby ensuring the service life of the wood materials. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the embodiments.

[0039] Example of preparation of chitosan-coated peppermint oil

[0040] The chitosan quaternary ammonium salt in the following raw materials was purchased from Jiangsu Caiwei Biotechnology Co., Ltd., with a content of 99%; the peppermint oil was purchased from Jinan Xinweida Chemical Co., Ltd., with a content of 99%; other raw materials and equipment were all commercially available.

[0041] Preparation Example 1: Chitosan-coated peppermint oil was prepared using the following method:

[0042] 2 kg of chitosan quaternary ammonium salt was weighed and placed in 100 kg of water and stirred until completely dissolved to obtain a chitosan quaternary ammonium salt solution. 5 kg of peppermint oil and 1 kg of glycerol were added to the chitosan quaternary ammonium salt solution and stirred at 3000 rpm for 2 h. Then 0.5 kg of glutaraldehyde was added and stirring was continued for 1 h. The solution was then filtered, washed, and vacuum spray dried to obtain the finished product with a particle size of 40 μm.

[0043] Example of preparing eugenol as a carrier for silica

[0044] Eugenol in the following raw materials was purchased from Shandong Wantong Chemical Co., Ltd., with a content of 99%; polyacrylamide was purchased from Beijing Meiston Technology Development Co., Ltd.; other raw materials and equipment were commercially available.

[0045] Preparation Example 2: Eugenol, the carrier of silica, was prepared by the following method:

[0046] Weigh 1 kg of silica particles and place them in 10 kg of eugenol solution. Disperse the silica particles ultrasonically at 20 kHz for 20 min, then let them stand for 10 min. Filter out the silica particles to obtain the carrier silica. The silica is a porous silica with a particle size of 80 μm. The eugenol solution is obtained by mixing and stirring 4 kg of eugenol with 6 kg of anhydrous ethanol.

[0047] Polyacrylamide was dissolved in water by stirring to obtain a 5% polyacrylamide solution. 0.4 kg of the polyacrylamide solution was evenly sprayed onto the surface of 1 kg of carrier silica. After drying and dispersing until the carrier silica particles did not stick together or agglomerate, the finished silica carrier eugenol was obtained.

[0048] Preparation example of modified sodium polyacrylate

[0049] Polyethyleneimine in the following raw materials was purchased from Shanghai Youen Chemical Co., Ltd.; sodium polyacrylate was purchased from Jiangsu Caiwei Biotechnology Co., Ltd.; other raw materials and equipment were commercially available.

[0050] Preparation Example 3: Modified sodium polyacrylate was prepared by the following method:

[0051] Weigh 1 kg of polyethyleneimine and place it in 100 kg of water, stirring until completely dissolved to obtain a polyethyleneimine solution;

[0052] Weigh 1 kg of gelatin and place it in 100 kg of warm water at a temperature of 50°C. Stir until the gelatin is completely dissolved to obtain a gelatin solution.

[0053] The polyethyleneimine solution and gelatin solution are mixed and stirred evenly to obtain a solution. The temperature of the solution is controlled at 35-40℃.

[0054] Weigh 1 kg of the solution and spray it evenly onto the surface of 1 kg of sodium polyacrylate. The sodium polyacrylate has a particle size of 150 μm. Then, immediately air dry it at 15°C. After dispersing the sodium polyacrylate until they no longer stick together, the finished product is obtained. Example

[0055] The following raw materials were purchased from Zhongshan Dixin Chemical Co., Ltd. (94% purity); fipronil from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd. (98% purity); and matrine from Xi'an Shennong Biotechnology Co., Ltd. (98% purity, water soluble). Other raw materials and equipment were commercially available.

[0056] Example 1: A composition containing dextrorotatory cypermethrin and fipronil:

[0057] 8 kg of dextromethorphan, 8 kg of fipronil, 100 kg of distilled water, 30 kg of slow-release agent, 0.1 kg of surfactant, the buffer agent is isopropanol, and the surfactant is AGC-401;

[0058] The preparation method is as follows:

[0059] S1. Weigh out dextrorotatory cypermethrin, fipronil, distilled water, slow-release adjuvant, and surfactant, mix and stir evenly to obtain the finished product composition.

[0060] Example 2: The difference between this example and Example 1 is that:

[0061] The mixture contained 8 kg of dextromethorphan, 8 kg of fipronil, 100 kg of distilled water, 0.025 kg of surfactant, and 30 kg of slow-release adjuvant. The buffer adjuvant consisted of an insecticidal excipient and a slow-release coating material in a mass ratio of 1:2. The insecticidal excipient consisted of peppermint oil, matrine, and eugenol in a mass ratio of 1:0.5:1. The peppermint oil was the chitosan-coated peppermint oil prepared in Preparation Example 1, and the eugenol was the fumed silica carrier eugenol prepared in Preparation Example 2. The slow-release coating material consisted of modified sodium polyacrylate and isopropanol in a mass ratio of 1:4. The modified sodium polyacrylate was the modified sodium polyacrylate prepared in Preparation Example 3, and the mass fraction of isopropanol was 90%.

[0062] Example 3: The difference between this example and Example 2 is that:

[0063] The mixture contained 5 kg of dextromethorphan, 5 kg of fipronil, 80 kg of distilled water, 0.15 kg of surfactant, and 20 kg of slow-release adjuvant. The buffer adjuvant consisted of an insecticidal excipient and a slow-release coating material in a mass ratio of 1:1. The insecticidal excipient consisted of peppermint oil, matrine, and eugenol in a mass ratio of 1:0.2:0.5. The peppermint oil was the chitosan-coated peppermint oil prepared in Preparation Example 1, and the eugenol was the eugenol used as a precipitate in Preparation Example 2. The slow-release coating material consisted of modified sodium polyacrylate and isopropanol in a mass ratio of 1:3. The modified sodium polyacrylate was the modified sodium polyacrylate prepared in Preparation Example 3, and the mass fraction of isopropanol was 90%.

[0064] Example 4: The difference between this example and Example 2 is that:

[0065] 10 kg of dextromethorphan, 10 kg of fipronil, 120 kg of distilled water, and 40 kg of slow-release adjuvant were prepared. The buffer adjuvant consisted of insecticidal excipients and slow-release coating material in a mass ratio of 1:3. The insecticidal excipients consisted of peppermint oil, matrine, and eugenol in a mass ratio of 1:0.5:0.8. The peppermint oil was chitosan-coated peppermint oil prepared in Preparation Example 1, and the eugenol was eugenol, a precipitate carrier for silica prepared in Preparation Example 2. The slow-release coating material consisted of modified sodium polyacrylate and isopropanol in a mass ratio of 1:5. The modified sodium polyacrylate was selected from those prepared in Preparation Example 3, and the mass fraction of isopropanol was 90%.

[0066] Example 5: The difference between this example and Example 2 is that:

[0067] No peppermint oil or eugenol were added to the insecticidal excipients.

[0068] Example 6: The difference between this example and Example 2 is that:

[0069] In insecticidal excipients, peppermint oil coated with sodium alginate was used to replace peppermint oil coated with chitosan quaternary ammonium salt of equal weight.

[0070] Example 7: The difference between this example and Example 2 is that:

[0071] In the preparation of eugenol, the carrier of precipitated silica, in insecticidal excipients, no polyacrylamide treatment was performed.

[0072] Weigh 1 kg of silica and place it in 10 kg of eugenol solution. Disperse the silica using ultrasound at 20 kHz for 20 min, then let it stand for 10 min. Filter out the silica to obtain the finished silica carrier eugenol.

[0073] Example 8: The difference between this example and Example 2 is that:

[0074] In the slow-release coating material, the modified sodium polyacrylate is replaced with an equal mass of sodium polyacrylate.

[0075] Example 9: The difference between this example and Example 2 is that:

[0076] In the preparation of modified sodium polyacrylate in the slow-release coating material, the same mass of sodium alginate solution is used to replace polyethyleneimine.

[0077] Performance testing

[0078] 1. Deworming test

[0079] The finished compositions were prepared using the methods described in Examples 1-4, respectively.

[0080] Detection device: Two square boxes with dimensions of 50cm×50cm×50cm. One side of the square box is made of glass, and the other side is made of cardboard. The two adjacent square boxes are connected by a glass pipe with a diameter of 20cm×180cm. There is an insect hole in the center of the channel, and movable partitions are provided on both sides.

[0081] Testing conditions: Laboratory temperature 26℃, relative humidity 60%;

[0082] Test mosquito species: 100 Culex mosquitoes, 100 flies, and 100 termites;

[0083] Indoor test: Turn on the diffuser and put it into the middle corner of the test glass box through the small door at the bottom corner of the glass device. Immediately close the entire glass device, suck up insects and put them in through the insect release port, open the channel partition and start timing. After 30 minutes, cut off the channel and record the number of mosquitoes in the glass box and the number of mosquitoes killed.

[0084] Statistical method: Deworming rate = (number of escaped insects + number of insects killed) / total number of mosquitoes in the test × 100%.

[0085] 2. Pesticide testing

[0086] The finished compositions were prepared using the preparation methods of Examples 1-4 respectively; 100 Culex mosquitoes, 100 flies and 100 termites were placed in a glass box, and then 5 mL of the composition was sprayed into the glass box, left to stand for 30 min, and the insecticidal rate was recorded.

[0087] Statistical method: Insect kill rate = number of insects killed / total number × 100%.

[0088] 3. Long-lasting insect repellent and insecticidal test

[0089] The finished compositions were prepared using the methods described in Examples 1-9, respectively.

[0090] Under controlled conditions of 85% relative humidity and 30℃ inside a glass jar, place two wooden boards (length × width × height = 20cm × 10cm × 1cm) and let them stand for 12 hours. Then, add 100 termites to the glass jar and evenly spray 10mL of the composition onto both boards. Let them stand for 30 minutes. The top of the glass jar has ventilation holes. Take another glass jar, transfer the two boards to the new jar, and add 50 termites. After 3 days, observe the number of live termites on the boards (recorded as: survival rate) and record the mass of wood loss.

[0091] Under conditions of controlled relative humidity of 85% and temperature of 30℃ inside a glass cover, place two wooden boards with a length × width × height of 20cm × 10cm × 1cm. Under the conditions of maintaining humidity and temperature, let them stand for 2 days. Cut the two sides of the wooden boards to a depth of 1mm. The remaining wooden board has a length × width × height of 20cm × 10cm × 0.8cm. Calculate the moisture content of the remaining wooden board.

[0092] Under controlled conditions of 85% relative humidity and 30℃ in a glass enclosure, two wooden boards with a length × width × height of 20cm × 10cm × 1cm were placed. Under the same humidity and temperature conditions, the boards were left to stand for 1 day. Then, 10mL of the composition was evenly sprayed onto both sides of the two wooden boards, with the sprayed area being 15cm × 8cm. The relative humidity and temperature remained unchanged. After standing for 1 day, the boards were cut to a depth of 1mm on both sides based on the depth at which no composition was applied at the edges. The remaining boards were 20cm × 10cm × 0.8cm in length × width × height. The moisture content of the boards after the composition treatment was recorded.

[0093] Moisture content difference = Moisture content of remaining wood board - Moisture content after treatment with the composition. A large moisture content difference indicates that the composition has a certain effect of blocking external humidity and can reduce the humidity of the wood to a certain extent.

[0094] Table 1 Performance Test Table

[0095]

[0096] As can be seen from Example 1 and Table 1, the composition prepared in this application has good insect repellent and insecticidal effects.

[0097] As can be seen from Examples 1 and 2-4 and Table 1, after adding chitosan-coated peppermint oil, eugenol and matrine as carriers of fumed silica, the composition still has good insect repellent and insecticidal effects even after a long period of time, and can prevent insects from damaging wood materials, while also blocking some moisture from the external environment.

[0098] Combining Examples 2 and 5-9 with Table 1, it can be seen that, in Example 5, no peppermint oil and eugenol were added to the insecticidal excipient. Compared with Example 2, the number of insect survivors in Example 5 was greater than that in Example 2, and the mass of wood loss was greater than that in Example 2. This indicates that the coated peppermint oil and the eugenol loaded with silica can be released slowly, thereby prolonging the release time of the insecticidal and insect-repellent active ingredients in the composition, giving the composition a long-lasting effect and protecting the wood from damage by insects.

[0099] In Example 6, the chitosan quaternary ammonium salt-coated peppermint oil was replaced with an equal mass of sodium alginate-coated peppermint oil. Compared with Example 2, the number of insects surviving in Example 6 was greater than that in Example 2, and the mass of wood loss was greater than that in Example 2. This indicates that chitosan quaternary ammonium salt has certain bactericidal and insecticidal effects and can improve the insecticidal efficiency of the composition.

[0100] In Example 7, during the preparation of eugenol, the carrier material in fumed silica, no polyacrylamide treatment was performed. Compared to Example 2, the number of insects surviving in Example 7 was greater than that in Example 2, and the mass of wood lost was greater in Example 7. This indicates that polyacrylamide not only facilitates the blocking of eugenol loaded in fumed silica and prolongs the release time of eugenol, but also promotes the cross-linking of eugenol, the carrier material in fumed silica, with chitosan-coated peppermint oil and modified sodium polyacrylate to form a cross-linked film layer, further prolonging the effect of the composition.

[0101] In Example 8, the modified sodium polyacrylate was replaced with an equal mass of sodium polyacrylate in the slow-release coating material. Compared with Example 2, the number of insects surviving in Example 8 was greater than that in Example 2, the mass of wood loss was greater than that in Example 2, and the difference in moisture content was smaller than that in Example 2. This indicates that when polyethyleneimine and gelatin are combined, they gradually absorb moisture in a humid environment, thereby gradually forming a cross-linked network. The film layer formed by gelatin and polyethyleneimine is breathable and has a certain water-blocking effect, which can reduce the probability of the wood surface being affected by the humid gas in the external environment and protect the wood material.

[0102] In Example 9, during the preparation of modified sodium polyacrylate in the slow-release coating material, the same mass of sodium alginate solution was used to replace polyethyleneimine. Compared with Example 2, the number of insects surviving in Example 9 was greater than that in Example 2, the mass of wood loss was greater than that in Example 2, and the difference in moisture content was smaller than that in Example 2. This indicates that polyethyleneimine has both hydrophilic and hydrophobic groups, which enables the film layer to have certain waterproof and water-resistant properties. This makes the surface of the wood material coated with the composition less susceptible to secondary damage from humid gases in the external environment, protects the structural strength of the wood material, and repels insects, thereby extending the service life of the wood material.

[0103] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A composition containing dextrorotatory cypermethrin and fipronil, characterized in that, The raw materials comprise the following parts by weight: 5-10 parts of dextromethorphan, 5-10 parts of dinotefuran, 80-120 parts of distilled water, 20-40 parts of a slow-release adjuvant, and 0.025-0.15 parts of a surfactant; the slow-release adjuvant is composed of an insecticidal excipient and a slow-release coating material in a mass ratio of 1:1-3; the insecticidal excipient is composed of peppermint oil, matrine, and eugenol in a mass ratio of 1:0.2-0.5:0.5-1; the coating material... Peppermint oil is chitosan-coated peppermint oil; the wall material of chitosan-coated peppermint oil is chitosan quaternary ammonium salt, and the core material is peppermint oil; eugenol is eugenol, a carrier of precipitated silica, which is obtained by modifying precipitated silica with eugenol and polyacrylamide in sequence; the slow-release coating material is composed of modified sodium polyacrylate and isopropanol in a mass ratio of 1:3-5; the modified sodium polyacrylate is obtained by coating sodium polyacrylate with polyethyleneimine and gelatin.

2. The method for preparing the composition containing dextrorotatory cypermethrin and fipronil according to claim 1, characterized in that, Includes the following steps: S1. Weigh out dextrorotatory cypermethrin, fipronil, distilled water, surfactant, and slow-release agent, mix and stir evenly to obtain the finished product composition.

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