High-stability profenofos and thiamethoxam compound synergistic missible oil

Abstract

The invention relates to high-stability profenofos and thiamethoxam compound synergistic missible oil, and relates to the technical field of pesticides, and the high-stability profenofos and thiamethoxam compound synergistic missible oil is prepared from the following raw materials in parts by mass: 20-50% of profenofos technical, 5-20% of thiamethoxam technical, 1-5% of an epoxy aid, 0.5-1% of an ether aid, 0.2-1.0% of a synergist, 3-6% of an emulsifier A, 8-10% of an emulsifier B, 1-5% of an emulsifier C and the balance of a solvent, totaling 100%. The profenofos-thiamethoxam compound missible oil has the effect of improving the control performance of the compound missible oil, the problem that profenofos in a profenofos and thiamethoxam system is decomposed too fast can be solved, rice planthoppers, chilo suppressalis and rice leaf folders are controlled at the same time, and the control effect is remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of pesticides, and in particular to a highly stable synergistic emulsifiable concentrate of profenofos and thiamethoxam. Background Art

[0002] Pesticide formulations play an important role in agricultural production, and can effectively prevent and control various diseases and pests, and ensure the healthy growth of crops. With the increasing awareness of environmental protection and the continuous improvement of health requirements in agricultural production, the development of efficient, low-toxic, and environmentally friendly pesticide formulations has become a current research hotspot. Especially in the prevention and control of common rice pests such as rice planthoppers, rice stem borers, and rice leaf rollers, it is particularly urgent to develop new pesticide formulations to meet the needs of different regions and seasons and ensure high and stable yields of crops.

[0003] For the effective control of such pests, the use of single ingredients such as bromophos or thiamethoxam can control pests to a certain extent, but the effect is often unsatisfactory when encountering pests with strong resistance. Therefore, researchers began to explore the possibility of compounding pesticides. By compounding different functional ingredients, not only can the effect of a single ingredient be improved, but also the usage can be reduced, reducing pollution to the environment.

[0004] However, the compound pesticide formula in the prior art has certain limitations, especially in terms of the stability of bromophos. Bromophos, as a highly effective pesticide ingredient, is prone to rapid decomposition during actual application after compounding with other ingredients, resulting in reduced efficacy and affecting the final control effect, so there is room for improvement. Summary of the invention

[0005] In order to improve the control effect of pests, the present application provides a highly stable synergistic emulsifiable concentrate of profenofos and thiamethoxam.

[0006] The present application provides a highly stable profenofos and thiamethoxam compound synergistic emulsifiable concentrate using the following technical solution: A high-stability profenofos and thiamethoxam compound synergistic emulsifiable concentrate, the preparation raw materials include the following components in percentage by weight: Profenofos 20-50% Thiamethoxam TC 5-20% Epoxy additives 1-5% Ether additives 0.5-1% Synergist 0.2-1.0% Emulsifier A3-6% Emulsifier B 8-10% Emulsifier C1-5% The solvent was made up to 100%.

[0007] The combined use of profenofos and thiamethoxam can broaden the insecticide spectrum, and can effectively control the chewing mouthparts pests Chilo suppressalis, rice leaf roller and piercing-sucking mouthparts pests Rice planthopper. The contact and stomach poison effects of profenofos and the systemic interference of thiamethoxam with the nervous system of pests complement each other, reducing the possibility of pests developing resistance. After application, the pests can be quickly poisoned by profenofos, and the systemic conduction of thiamethoxam can be relied on to keep the efficacy of the drug, achieving a synergistic effect, achieving better control effects while reducing the amount of medicine used, and improving the utilization rate of pesticides. Usage rate; epoxy additives and ether additives can promote the emulsification and dispersion of profenofos and thiamethoxam, effectively coat them, prevent the aggregation and precipitation of the active ingredients, and enhance the adhesion and penetration of the agents on the plant surface. The synergistic effect of the two enables the pesticide emulsifiable concentrate to play a better role; synergists can enhance the adsorption and penetration of profenofos and thiamethoxam on the plant surface, inhibit the activity of detoxification enzymes in pests, and enhance the effect of emulsifiable concentrates; emulsifiers are used in combination with the three ingredients to effectively improve the emulsification performance, uniformity and stability of emulsifiable concentrates.

[0008] Preferably, the raw materials for preparing the epoxy auxiliary agent include ethylene oxide-propylene oxide block copolymer, maleic anhydride and catechin.

[0009] The ethylene oxide-propylene oxide block copolymer can form a spatial network structure through intermolecular forces in the emulsion system, wrap the thiamethoxam and profenofos molecules, reduce the direct contact between the two and the external environment, reduce the influence of factors such as light, heat, and air on the effective ingredients, improve the stability of profenofos and thiamethoxam, and reduce the degradation rate of profenofos; maleic anhydride can introduce more active groups into the ethylene oxide-propylene oxide block copolymer, improve its reaction performance, and capture free radicals, interrupt the oxidation reaction chain, and improve the stability of the effective ingredients; catechins have rich phenolic hydroxyl groups, which can block the free radical chain reaction, and synergize with maleic anhydride to improve the stability of profenofos and thiamethoxam, reduce the degradation rate of the effective ingredients, and make thiamethoxam and profenofos remain active for a long time, so as to better play a preventive and control role.

[0010] Preferably, the mass ratio of the ethylene oxide-propylene oxide block copolymer, maleic anhydride and catechin is 1:0.6:(0.3-0.5).

[0011] The epoxy additive prepared according to the above mass ratio has good antioxidant properties, can effectively cover and protect bromophos and thiamethoxam, reduce the degradation rate of the two, and improve the stability of the emulsifiable concentrate, thereby improving the pest control effect.

[0012] Preferably, the raw materials for preparing the ether auxiliary agent include polyvinyl alcohol diglycidyl ether, hindered amine and thiocyanate.

[0013] Polyvinyl alcohol diglycidyl ether has abundant active groups and can react with epoxy additives to form a more stable three-dimensional network cross-linking structure, better protect profenofos and thiamethoxam, and promote the uniform dispersion of the two in the emulsifiable concentrate; hindered amines can capture active oxygen free radicals generated by oxidation reactions in the system, inhibit the oxidative damage of thiamethoxam and profenofos by free radical chain reactions, absorb and transform harmful ultraviolet energy, and emit it in the form of harmless heat energy, thereby reducing the excitation and damage of ultraviolet rays to pesticide molecules; thiocyanate has good reactivity and can improve the cross-linking properties of ether additives and epoxy additives, introduce sulfur groups into the three-dimensional network structure, improve the stability of the three-dimensional network structure, thereby improving the stability of the emulsifiable concentrate and solving the problem of excessive degradation of profenofos in the mixed system of profenofos and thiamethoxam.

[0014] Preferably, the mass ratio of the polyvinyl alcohol diglycidyl ether, the hindered amine and thiocyanate is 1:0.3:(0.05-0.1).

[0015] The ether additives prepared according to the above mass ratio can be cross-linked with the epoxy additives, effectively protecting the thiamethoxam molecules, reducing the decomposition rates of the two, and improving their stability.

[0016] Preferably, the raw materials for preparing the synergist include piperonyl ether, organosilicon additive and N,N-dimethylbenzylamine.

[0017] Piperonyl ether can inhibit the activity of detoxification enzymes in pests, preventing pests from decomposing and metabolizing the active ingredients in pesticides, allowing pesticide emulsions to remain active and effectively act on the target sites of pests, thereby improving the insecticidal effect; silicone adjuvants have low surface tension, which can reduce the contact angle between pesticide emulsion droplets and the target surface, making it easier to spread and penetrate, making it easier for the active ingredients of pesticides to pass through the wax layer of the plant epidermis and the cuticle of the pest, and enter the plant tissue or the body of the pest, thereby improving the pesticide's Bioavailability, enhance control effect; N, N-dimethylbenzylamine can promote the dispersion of active ingredients of pesticides through charge action or hydrogen bonding, making it easier for the active ingredients to escape from droplets and contact the target, and N, N-dimethylbenzylamine can promote the cross-linking between epoxy adjuvants and ether adjuvants, thereby improving the uniformity and stability of the emulsion system; synergistic effect of pyroxene, silicone adjuvant and N, N-dimethylbenzylamine can significantly enhance the control effect of profenofos and thiamethoxam on target pests.

[0018] Preferably, the emulsifier A comprises a calcium alkylbenzene sulfonate emulsifier.

[0019] Preferably, the emulsifier B includes a nonionic surfactant emulsifier.

[0020] Preferably, the emulsifier C comprises an aromatic phenol polyoxyethylene ether phosphate emulsifier.

[0021] Calcium alkylbenzene sulfonate emulsifiers have good emulsifying properties, can reduce interfacial tension, form a stable emulsifiable concentrate system, improve the uniformity of the emulsifiable concentrate system, and prevent the active ingredients from aggregating and affecting the efficacy; non-ionic surfactant emulsifiers have excellent dispersing and wetting properties. Non-ionic surfactant emulsifiers usually have good stability and compatibility, and can play a synergistic role with calcium alkylbenzene sulfonate emulsifiers to further improve the emulsification effect and the stability of pesticide emulsifiable concentrates; aromatic phenol polyoxyethylene ether phosphate emulsifiers have multiple functions such as emulsification, dispersing and antistatic, further enhance the stability of the emulsifiable concentrate system, make the active ingredients stably dispersed, and reduce the aggregation of droplets during pesticide spraying, improve the uniformity of the spray, ensure that bromophos and thiamethoxam can act on the target more accurately, and better play the control performance of the compound emulsifiable concentrate; the three emulsifiers can cooperate with each other to effectively improve the stability of the emulsifiable concentrate system, thereby improving the control effect of the emulsifiable concentrate.

[0022] Preferably, the high-stability profenofos and thiamethoxam compound synergistic emulsifiable concentrate is prepared by the following steps: The technical drug of probromphos and the technical drug of thiamethoxam are dispersed in a solvent, emulsifier A and emulsifier B are added, and after stirring and dispersing, emulsifier C is added, and after stirring and dispersing, a technical emulsifiable concentrate is obtained, epoxy additives, ether additives and synergists are added to the technical emulsifiable concentrate, and after heating and stirring, homogenization is performed to obtain a highly stable composite synergistic emulsifiable concentrate of probromphos and thiamethoxam.

[0023] The emulsifiable concentrate prepared according to the above steps has good control effects on the striped stem borer, rice leaf folder and rice planthopper, expands the control spectrum of a single product, makes the product easy to use, and reduces the use of carrier solvents.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The combined use of profenofos and thiamethoxam can broaden the insecticide spectrum, and can effectively control the chewing mouthparts pests Chilo suppressalis, rice leaf roller and piercing-sucking mouthparts pests Rice planthopper. The contact and stomach poisoning effects of profenofos and the systemic interference of thiamethoxam with the nervous system of pests complement each other, reducing the possibility of pests developing resistance. After application, the pests can be quickly poisoned by profenofos, and the systemic conduction of thiamethoxam can be relied on to keep the efficacy of the drug, achieving a synergistic effect, achieving better control effects while reducing the amount of medicine used, and improving the Utilization rate; Epoxy adjuvants and ether adjuvants can promote the emulsification and dispersion of profenofos and thiamethoxam, effectively coat them, prevent the aggregation and precipitation of the active ingredients, and enhance the adhesion and penetration ability of the agents on the plant surface. The synergistic effect of the two enables the pesticide emulsifiable concentrate to play a better role; synergists can improve the adsorption and penetration ability of profenofos and thiamethoxam on the plant surface, inhibit the activity of detoxification enzymes in pests, and enhance the effect of emulsifiable concentrates; emulsifiers are used in combination with the three ingredients to effectively improve the emulsification performance, uniformity and stability of emulsifiable concentrates.

[0025] 2. The ethylene oxide-propylene oxide block copolymer can form a spatial network structure through intermolecular forces in the emulsion system to wrap the thiamethoxam and probromophos molecules, reduce their direct contact with the external environment, reduce the influence of factors such as light, heat, and air on the effective ingredients, improve the stability of probromophos and thiamethoxam, and reduce the degradation rate of probromophos; maleic anhydride can introduce more active groups into the ethylene oxide-propylene oxide block copolymer, improve its reaction performance, and capture free radicals, interrupt the oxidation reaction chain, and improve the stability of the effective ingredients; catechins have rich phenolic hydroxyl groups, which can block the free radical chain reaction, and synergize with maleic anhydride to improve the stability of probromophos and thiamethoxam, reduce the degradation rate of the effective ingredients, and make thiamethoxam and probromophos remain active for a long time, so as to better play a preventive and control role.

[0026] 3. Epoxy additives and ether additives have abundant active groups, which can undergo cross-linking reactions to form a more stable three-dimensional network cross-linking structure, better protect probromophos and thiamethoxam, and promote the uniform dispersion of the two in the emulsifiable concentrate; catechins and hindered amines can capture the active oxygen free radicals generated by the oxidation reaction in the system, inhibit the oxidative damage of thiamethoxam and probromophos by the free radical chain reaction, absorb and transform harmful ultraviolet energy, and emit it in the form of harmless heat energy, thereby reducing the excitation and damage of ultraviolet rays to pesticide molecules, and solving the problem of excessive degradation of probromophos in the mixed system of probromophos and thiamethoxam.

[0027] 4. Piperonyl ether can inhibit the activity of detoxification enzymes in pests, preventing pests from decomposing and metabolizing the active ingredients in pesticides, so that the pesticide emulsion can remain active and effectively act on the target sites of pests, thereby improving the insecticidal effect; silicone adjuvants have low surface tension, which can reduce the contact angle between the pesticide emulsion droplets and the target surface, making it easier to spread and penetrate, making it easier for the active ingredients of pesticides to pass through the wax layer of the plant epidermis and the cuticle of the pests, and enter the plant tissue or the body of the pest, thereby improving the pesticide The bioavailability of pesticides can be increased, thereby enhancing the control effect; N, N-dimethylbenzylamine can promote the dispersion of active ingredients of pesticides through charge action or hydrogen bonding, making it easier for the active ingredients to escape from droplets and contact the target sites, and N, N-dimethylbenzylamine can promote the cross-linking between epoxy adjuvants and ether adjuvants, thereby improving the uniformity and stability of the emulsion system; synergistic effects of pyroxene ether, silicone adjuvant and N, N-dimethylbenzylamine can significantly enhance the control effect of profenofos and thiamethoxam on target pests. DETAILED DESCRIPTION

[0028] The present application example discloses a high-stability profenofos and thiamethoxam compound synergistic emulsifiable concentrate. The raw materials used in the present application can be obtained from commercially available raw materials unless otherwise specified. The present application is further described in detail in conjunction with the examples below: Raw materials description: Maleic anhydride (CAS No.: 108-31-6), ethylene oxide-propylene oxide block copolymer (CAS No.: 9003-11-6), molecular weight 2500, catechin (CAS No.: 154-23-4), polyvinyl alcohol diglycidyl ether (CAS No.: 26403-72-5), hindered amine is 4-hydroxy-2,2,6,6-tetramethylpiperidinyloxy (CAS No.: 3637-10-3), dibutyltin dilaurate (CAS No.: 77-58-7), trithiocyanic acid (CAS No.: 638-16-4), bromophos drug (CAS No.: 41198-08-7), thiamethoxam technical drug (CAS No.: 153719-23-4), solvent is vegetable oil (CAS: 68956-68-3), emulsifier A is calcium dodecylbenzene sulfonate (CAS No.: 26264-06-2), emulsifier B is nonylphenol polyoxyethylene ether TX-10 (CAS: 14409-72-4), emulsifier C is alkylphenol polyoxyethylene ether phosphate APE-10P (CAS No.: 51811-79-1), piperonyl butoxide (CAS No.: 51-03-6), silicone additive is Silwet L-77 (CAS No.: 27306-78-1), N, N-dimethylbenzylamine (CAS No.: 103-83-3).

[0029] Example 1 Preparation of epoxy additives 3.16 kg of maleic anhydride was added to 5.26 kg of ethylene oxide-propylene oxide block copolymer within 1 hour, and the mixture was stirred at 120°C at 200 rpm for 4 hours. Subsequently, 1.58 kg of catechin was added, and the mixture was stirred at 50°C at 200 rpm for 1 hour. The mixture was cooled to below 30°C and discharged to obtain an epoxy additive.

[0030] Preparation of ether additives 1.48 kg of polyvinyl alcohol diglycidyl ether and 0.44 kg of hindered amine were mixed and dispersed in 5 L of DMF, 0.05 kg of dibutyltin dilaurate was added, and the mixture was stirred at 60 ° C and 200 rpm for 2 h. Subsequently, 0.08 kg of thiocyanuric acid was added, and the mixture was stirred at 50 ° C and 200 rpm for 1 h. The solvent was removed by rotary evaporation to obtain an ether auxiliary agent.

[0031] Preparation of highly stable synergistic emulsifiable concentrate of profenofos and thiamethoxam 20 kg of probromophos technical and 20 kg of thiamethoxam technical were dispersed in 48.3 kg of solvent, 3 kg of emulsifier A and 8 kg of emulsifier B were added, and the mixture was dispersed at a speed of 500 rpm for 1 hour. 1 kg of emulsifier C was added and dispersed at a speed of 500 rpm for 30 minutes to obtain the technical emulsifiable concentrate. 1 kg of epoxy additives, 0.5 kg of ether additives and 0.2 kg of synergist were added to the technical emulsifiable concentrate, the mass ratio of the synergistic ether, silicone additive and N, N-dimethylbenzylamine in the synergist was 1:0.5:0.5, and the mixture was stirred at a speed of 300 rpm for 2 hours at 50°C, followed by homogenization for 1 hour to obtain a highly stable probromophos and thiamethoxam composite synergistic emulsifiable concentrate.

[0032] Example 2 Preparation of epoxy additives 2.86 kg of maleic anhydride was added to 4.76 kg of ethylene oxide-propylene oxide block copolymer within 1 hour, and the mixture was stirred at 120°C at 200 rpm for 4 hours. Subsequently, 2.38 kg of catechin was added, and the mixture was stirred at 50°C at 200 rpm for 1 hour. The mixture was cooled to below 30°C and discharged to obtain an epoxy additive.

[0033] Preparation of ether additives 1.43 kg of polyvinyl alcohol diglycidyl ether and 0.43 kg of hindered amine were dispersed in 5 L of DMF, 0.05 kg of dibutyltin dilaurate was added, and the mixture was stirred at 60 ° C and 200 rpm for 2 h. Subsequently, 0.14 kg of thiocyanuric acid was added, and the mixture was stirred at 50 ° C and 200 rpm for 1 h. The solvent was removed by rotary evaporation to obtain an ether auxiliary agent.

[0034] Preparation of highly stable synergistic emulsifiable concentrate of profenofos and thiamethoxam 50 kg of probromophos technical and 5 kg of thiamethoxam technical were dispersed in 17 kg of solvent, 6 kg of emulsifier A and 10 kg of emulsifier B were added, and the mixture was dispersed at a speed of 500 rpm for 1 hour. 5 kg of emulsifier C was added and dispersed at a speed of 500 rpm for 30 minutes to obtain the technical emulsifiable concentrate. 5 kg of epoxy additives, 1 kg of ether additives and 1 kg of synergist were added to the technical emulsifiable concentrate, and the mass ratio of the synergistic ether, silicone additive and N, N-dimethylbenzylamine in the synergist was 1:0.5:0.5. The mixture was stirred at a speed of 300 rpm for 2 hours at 50°C, and then homogenized for 1 hour to obtain a highly stable probromophos and thiamethoxam composite synergistic emulsifiable concentrate.

[0035] Example 3 Preparation of epoxy additives Add 3 kg of maleic anhydride to 5 kg of ethylene oxide-propylene oxide block copolymer within 1 hour, stir and react at 120°C at 200 rpm for 4 hours, then add 2 kg of catechin, stir and react at 50°C at 200 rpm for 1 hour, cool to below 30°C and discharge to obtain an epoxy additive.

[0036] Preparation of ether additives 1.45 kg of polyvinyl alcohol diglycidyl ether and 0.44 kg of hindered amine were mixed and dispersed in 5 L of DMF, 0.05 kg of dibutyltin dilaurate was added, and the mixture was stirred at 60 ° C and 200 rpm for 2 h. Subsequently, 0.11 kg of thiocyanuric acid was added, and the mixture was stirred at 50 ° C and 200 rpm for 1 h. The solvent was removed by rotary evaporation to obtain an ether auxiliary agent.

[0037] Preparation of highly stable synergistic emulsifiable concentrate of profenofos and thiamethoxam 35 kg of probromophos technical and 12.5 kg of thiamethoxam technical were dispersed in 31.65 kg of solvent, 4.5 kg of emulsifier A and 9 kg of emulsifier B were added, and the mixture was dispersed at a speed of 500 rpm for 1 hour. 3 kg of emulsifier C was added and dispersed at a speed of 500 rpm for 30 minutes to obtain the technical emulsifiable concentrate. 3 kg of epoxy additives, 0.75 kg of ether additives and 0.6 kg of synergist were added to the technical emulsifiable concentrate, and the mass ratio of the synergistic ether, silicone additive and N, N-dimethylbenzylamine in the synergist was 1:0.5:0.5. The mixture was stirred at a speed of 300 rpm for 2 hours at 50°C, and then homogenized for 1 hour to obtain a highly stable probromophos and thiamethoxam composite synergistic emulsifiable concentrate.

[0038] Example 4 Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that in Example 4, the amount of ethylene oxide-propylene oxide block copolymer used is 5.56 kg, the amount of maleic anhydride used is 3.33 kg, and the amount of catechin used is 1.11 kg.

[0039] Example 5 Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that in Example 5, the amount of ethylene oxide-propylene oxide block copolymer used is 4.54 kg, the amount of maleic anhydride used is 2.73 kg, and the amount of catechin used is 2.73 kg.

[0040] Example 6 Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that catechin is not added when preparing the epoxy auxiliary agent in Example 6.

[0041] Example 7 Example 7 is based on Example 3. The only difference between Example 7 and Example 3 is that maleic anhydride is not added when preparing the epoxy additive in Example 7.

[0042] Example 8 Example 8 is based on Example 3. The only difference between Example 8 and Example 3 is that in Example 8, the amount of polyvinyl alcohol diglycidyl ether used is 1.52 kg, the amount of hindered amine used is 0.45 kg, and the amount of thiocyanate used is 0.03 kg.

[0043] Example 9 Example 9 is based on Example 3. The only difference between Example 9 and Example 3 is that in Example 9, the amount of polyvinyl alcohol diglycidyl ether used is 1.38 kg, the amount of hindered amine used is 0.41 kg, and the amount of thiocyanate used is 0.21 kg.

[0044] Example 10 Example 10 is based on Example 3. The only difference between Example 10 and Example 3 is that no hindered amine is added when preparing the ether auxiliary agent in Example 10.

[0045] Embodiment 11 Example 11 is based on Example 3. The only difference between Example 11 and Example 3 is that no thiocyanate is added when preparing the ether auxiliary agent in Example 11.

[0046] Example 12 Example 12 is based on Example 3. The only difference between Example 12 and Example 3 is that in Example 12, no organosilicon additive is added to the synergist.

[0047] Embodiment 13 Example 13 is based on Example 3. The only difference between Example 13 and Example 3 is that in Example 13, no organosilicon additive and piperonyl ether are added to the synergist.

[0048] Comparative Example 1 Comparative Example 1 is based on Example 3. The only difference between Comparative Example 1 and Example 3 is that no profenofos technical drug is added in Comparative Example 1, and the balance is supplemented with thiamethoxam technical drug.

[0049] Comparative Example 2 Comparative Example 2 is based on Example 3. The only difference between Comparative Example 2 and Example 3 is that no thiamethoxam technical drug is added in Comparative Example 2, and the balance is supplemented with profenofos technical drug.

[0050] Comparative Example 3 is based on Example 3, and the only difference between Comparative Example 3 and Example 3 is that no synergist is added in Comparative Example 3.

[0051] Performance testing When the rice seedlings are in the tillering stage to the booting stage, experimental plots are set up in the rice fields, with each plot of 50m 2 Each plot was marked with 5 points, with 1 clump at each point, and the number of rice planthoppers, striped stem borers and rice leaf folders was investigated. The sample was diluted 1000 times and sprayed evenly when the rice seedlings were in the tillering stage to the booting stage. The number of pests in the rice clumps at the marked point was investigated 7 days after the spraying, and the control effect of the sample on rice planthoppers, striped stem borers and rice leaf folders was counted.

[0052] Table 1 Test results As shown in Table 1, the control effect of Examples 1-3 on rice planthoppers is greater than 87.6%, the control effect on striped stem borers is greater than 88.2%, and the control effect on rice leaf folders is greater than 87.8%, which shows that the compound emulsifiable concentrate prepared in the present application has good pest control performance.

[0053] As can be seen from Table 1, the only difference between Examples 4 and 5 and Example 3 is that the mass ratio of ethylene oxide-propylene oxide block copolymer, maleic anhydride and catechin in Example 4 is 1:0.6:0.2, and the mass ratio of ethylene oxide-propylene oxide block copolymer, maleic anhydride and catechin in Example 5 is 1:0.6:0.6. Compared with Example 3, after reducing the amount of catechin, the control effects of the three pests in Examples 4 and 5 are reduced. This is because the reduction of catechin will affect the antioxidant properties of the system, and then affect the decomposition rate of profenofos and thiamethoxam, so that the control effects are reduced. However, the improvement of the control effect by increasing the proportion of catechin is not obvious.

[0054] As can be seen from Table 1, the only difference between Examples 6 and 7 and Example 3 is that catechin is not added when preparing the epoxy additive in Example 6, and maleic anhydride is not added when preparing the epoxy additive in Example 7. Compared with Example 3, the control effects of Examples 6 and 7 are reduced; this is because not adding catechin or maleic anhydride will affect the antioxidant properties of the emulsifiable concentrate, and affect the reactivity of the epoxy additive, thereby affecting the stability of the emulsifiable concentrate system, so that the control effects are reduced.

[0055] As can be seen from Table 1, the only difference between Examples 8 and 9 and Example 3 is that the mass ratio of polyvinyl alcohol diglycidyl ether, hindered amine and thiocyanuric acid in Example 8 is 1:0.3:0.02, and the mass ratio of polyvinyl alcohol diglycidyl ether, hindered amine and thiocyanuric acid in Example 9 is 1:0.3:0.15. Compared with Example 3, the control effects of Examples 8 and 9 are reduced; this is because the mass ratio of polyvinyl alcohol diglycidyl ether, hindered amine and thiocyanuric acid is not within the specified range, too much or too little thiocyanuric acid will affect the reaction performance of epoxy additives and ether additives, reduce the encapsulation effect of the original drug molecules, and then affect the stability of the original drug molecules and the emulsifiable concentrate system, so that the control performance is reduced.

[0056] As can be seen from Table 1, the only difference between Examples 10 and 11 and Example 3 is that no hindered amine is added when preparing the ether additive in Example 10, and no thiocyanuric acid is added when preparing the ether additive in Example 11. Compared with Example 3, the control performance of Examples 10 and 11 is reduced; this is because no hindered amine or thiocyanuric acid is added when preparing the ether additive. Not adding hindered amine will affect the antioxidant and UV resistance of the emulsifiable concentrate, and the effective ingredients will be more easily decomposed. Not adding thiocyanuric acid will affect the reaction performance of the ether additive and the epoxy additive, thereby affecting the stability of the emulsifiable concentrate system, so that the control effect is reduced.

[0057] As can be seen from Table 1, the only difference between Examples 12 and 13 and Example 3 is that in Example 12, no organosilicon adjuvant is added to the synergist, and in Example 13, no organosilicon adjuvant and piperonyl ether are added to the synergist. Compared with Example 3, the control effects of Examples 12 and 13 are reduced. This is because the lack of organosilicon adjuvant reduces the wettability of the emulsifiable concentrate, reduces the utilization rate of the pesticide, and reduces the control effect. Furthermore, without adding piperonyl ether, the activity of the pest detoxification enzyme increases, the drug resistance increases, and the control effect of the emulsifiable concentrate decreases.

[0058] As can be seen from Table 1, the only difference between Comparative Examples 1, 2, and 3 and Example 3 is that: Comparative Example 1 does not add probromophos original drug, Comparative Example 2 does not add thiamethoxam original drug, and Comparative Example 3 does not add synergist. Compared with Example 3, the control effects of Comparative Examples 1, 2, and 3 are greatly reduced; this is because if probromophos and thiamethoxam are not compounded, single probromophos and thiamethoxam only have good effects on some pests, and the control spectrum of the product is narrower; if the synergist component is not used, the effects of probromophos and thiamethoxam on target pests are reduced. It can also be seen from the data of Comparative Examples 1, 2, and 3 that the synergist has a significant synergistic effect on both probromophos and thiamethoxam, and can effectively improve the control effect. When the synergist is lacking, the control effect is significantly reduced.

[0059] This specific embodiment is only an explanation of the present application, and it is not a limitation of the present application. Through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of ​​the present application. The technical scope of the present application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A highly stable composite synergistic emulsifiable concentrate of profenofos and thiamethoxam, characterized in that: The raw materials for preparation include the following components in percentage by weight: Profenofos 20-50% Thiamethoxam TC 5-20% Epoxy additives 1-5% Ether additives 0.5-1% Synergist 0.2-1.0% Emulsifier A 3-6% Emulsifier B 8-10% Emulsifier C 1-5% The solvent was made up to 100%.

2. A highly stable profenofos and thiamethoxam composite synergistic emulsifiable concentrate according to claim 1, characterized in that: The raw materials for preparing the epoxy auxiliary agent include ethylene oxide-propylene oxide block copolymer, maleic anhydride and catechin.

3. A highly stable profenofos and thiamethoxam composite synergistic emulsifiable concentrate according to claim 2, characterized in that: The mass ratio of the ethylene oxide-propylene oxide block copolymer, maleic anhydride and catechin is 1:0.6:(0.3-0.5).

4. A highly stable profenofos and thiamethoxam composite synergistic emulsifiable concentrate according to claim 1, characterized in that: The raw materials for preparing the ether auxiliary agent include polyvinyl alcohol diglycidyl ether, hindered amine and thiocyanate.

5. A highly stable profenofos and thiamethoxam composite synergistic emulsifiable concentrate according to claim 4, characterized in that: The mass ratio of the polyvinyl alcohol diglycidyl ether, the hindered amine and thiocyanate is 1:0.3:(0.05-0.1).

6. A highly stable profenofos and thiamethoxam composite synergistic emulsifiable concentrate according to claim 1, characterized in that: The raw materials for preparing the synergist include piperidine ether, organosilicon additive and N,N-dimethylbenzylamine.

7. A highly stable profenofos and thiamethoxam composite synergistic emulsifiable concentrate according to claim 1, characterized in that: The emulsifier A includes calcium alkylbenzene sulfonate emulsifier.

8. A highly stable profenofos and thiamethoxam composite synergistic emulsifiable concentrate according to claim 7, characterized in that: The emulsifier B includes a nonionic surfactant emulsifier.

9. A highly stable profenofos and thiamethoxam composite synergistic emulsifiable concentrate according to claim 8, characterized in that: The emulsifier C includes an aromatic phenol polyoxyethylene ether phosphate emulsifier.

10. A highly stable profenofos and thiamethoxam compound synergistic emulsifiable concentrate according to any one of claims 1 to 9, characterized in that: The high-stability profenofos and thiamethoxam compound synergistic emulsifiable concentrate is prepared by the following steps: The technical drug of probromphos and the technical drug of thiamethoxam are dispersed in a solvent, emulsifier A and emulsifier B are added, and after stirring and dispersing, emulsifier C is added, and after stirring and dispersing, a technical emulsifiable concentrate is obtained, epoxy additives, ether additives and synergists are added to the technical emulsifiable concentrate, and after heating and stirring, homogenization is performed to obtain a highly stable composite synergistic emulsifiable concentrate of probromphos and thiamethoxam.

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