Herbicide composition and preparation method thereof

Abstract

The invention relates to a herbicide composition and a preparation method thereof, and relates to the technical field of agricultural herbicides, and the herbicide composition is prepared from the following raw materials in parts by mass: 40-50 parts of a herbicide drug-loading system, 3-5 parts of carbon black, 0.5-1 part of an anti-ultraviolet agent, 0.5-1 part of an antioxidant, 5-15 parts of a compound high-dispersity emulsifier and 10-15 parts of filler. The preparation method comprises the following steps: mixing carbon black, an anti-ultraviolet agent, an antioxidant and a filler, uniformly stirring, adding a herbicide loading system and a compound high-dispersity emulsifier, and uniformly stirring to obtain a mixture; and carrying out mechanical pulverization and airflow pulverization on the mixture, drying, screening and packaging to obtain the herbicide composition. The herbicide composition has the effect of improving the stability of the herbicide composition, the decomposition rate of the herbicide can be effectively reduced, and the weeding effect of the herbicide composition is improved.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural herbicides, and in particular to a herbicide composition and a preparation method thereof. Background Art

[0002] Herbicides are an indispensable and important tool in modern agriculture. They are widely used in farmland, orchards, lawns and other environments to control weed growth and improve crop yield and quality. With the development of agricultural technology, the research and development of herbicides has continued to progress, and new high-efficiency, low-toxic and environmentally friendly herbicides have continued to emerge, greatly promoting the improvement of agricultural production efficiency. However, in actual applications, the effect of herbicides is often affected by many factors.

[0003] At present, in order to improve the effect of herbicides, common practices include adjusting the type and proportion of active ingredients, adding various adjuvants, and improving the application method. Although existing herbicide formulations have made certain progress in some aspects, there are still certain deficiencies in practical application. Some herbicides are prone to degradation during storage and transportation and after actual application, and have poor stability, which affects the efficacy of the herbicide, so there is room for improvement. Summary of the invention

[0004] In order to reduce the decomposition rate of a herbicide and improve its stability, the present application provides a herbicide composition and a preparation method thereof.

[0005] The present application provides a herbicide composition and a preparation method thereof using the following technical scheme: In the first aspect, the present application provides a herbicide composition, which adopts the following technical solution: A herbicide composition, the preparation raw materials include the following components in parts by weight: 40-50 copies of herbicide delivery system 3-5 parts of carbon black Anti-ultraviolet agent 0.5-1 part 0.5-1 part antioxidant Compound high dispersibility emulsifier 5-15 parts 10-15 parts of filler.

[0006] The herbicide delivery system effectively loads the herbicide, can promote the uniform dispersion of the herbicide components and control the release rate, and through the protection of the carrier, can reduce the impact of the environment on the herbicide, improve the stability of the herbicide, and thus reduce the decomposition rate; carbon black has high thermal conductivity, can quickly dissipate heat, reduce the accumulation of heat near the herbicide molecules, and improve its thermal stability, and can also serve as a physical barrier to play an adsorption and barrier role, reducing the impact of external factors on the herbicide; the anti-ultraviolet agent can effectively block the destructive effect of ultraviolet rays, and the antioxidant inhibits the oxidation reaction, and the two synergistically reduce the decomposition rate of the herbicide; the compounded high-dispersibility emulsifier can make the herbicide delivery system uniformly dispersed in the system, improve its stability, and reduce the decomposition rate of the herbicide, so that the herbicide composition can continuously and stably exert a high-efficiency weed control effect during use.

[0007] Preferably, the raw materials for preparing the herbicide delivery system include compound herbicides and mesoporous silica.

[0008] The special structure of mesoporous silica provides a good loading environment for compound herbicides, significantly improves the stability of compound herbicides, and can effectively block the influence of external factors such as oxygen, moisture and ultraviolet rays on herbicide molecules, thereby reducing the decomposition rate of herbicides. At the same time, mesoporous silica can control the release rate of herbicides, allowing them to exert their effects continuously and stably during use, thereby improving the herbicide efficacy.

[0009] Preferably, the compound herbicide includes one or more of clethodim, fomesafen, metolachlor, chloranil, clopyralid, metribuzin, sulfamethoxam, glufosinate, quizalofop-P-ethyl, fluazifop-P-ethyl, and imazamox.

[0010] Preferably, the herbicide delivery system is prepared by the following steps: The mesoporous silica is ultrasonically washed with anhydrous ethanol and dried in an oven to obtain pretreated mesoporous silica; the pretreated mesoporous silica and the herbicide composition are mixed, vacuumed and stirred, and filtered to obtain the herbicide drug-carrying system.

[0011] The herbicide delivery system prepared according to the above steps has a high loading rate, can effectively improve the stability of the compound herbicide, reduce the decomposition rate, and improve the herbicide efficacy.

[0012] Preferably, the mesoporous silica is subjected to modification treatment to obtain modified mesoporous silica, and the raw materials for preparing the modified mesoporous silica include mesoporous silica body and dimethyldimethoxysilane.

[0013] Mesoporous silica is modified with dimethyldimethoxysilane to obtain modified mesoporous silica. The modified mesoporous silica improves the dispersibility of the drug delivery system, allowing it to be more evenly distributed in the system, providing a good protective layer for the compound herbicide, thereby effectively reducing the decomposition rate of the herbicide; dimethyldimethoxysilane also improves the wettability of the drug delivery system, allowing the drug delivery system to better contact with plant leaves, allowing the herbicide to more fully exert its weed control effect, thereby significantly improving the herbicide efficacy.

[0014] Preferably, the mass ratio of the mesoporous silica body to dimethyldimethoxysilane is 1:(0.05-0.1).

[0015] The modified mesoporous silica prepared according to the above mass ratio has good dispersibility and wettability. By adjusting the amount of dimethyldimethoxysilane, the influence on the pore structure is reduced, and the modified mesoporous silica can achieve a good drug loading effect.

[0016] Preferably, the carbon black is subjected to modification treatment to obtain modified carbon black, and the raw materials for preparing the modified carbon black include carbon black body, dispersant and heat stabilizer.

[0017] The dispersant enables the modified carbon black to have good dispersibility in the herbicide composition system and to be evenly distributed, acting as a physical barrier to adsorb and block the effects of external factors on the herbicide, thereby improving the stability of the herbicide composition; the addition of the thermal stabilizer enhances the thermal stability of carbon black, and when facing different temperature environments, it can effectively reduce the effect of heat on the herbicide and reduce the decomposition rate of the herbicide.

[0018] Preferably, the heat stabilizer includes one of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite and tris(2,4-di-tert-butylphenyl)phosphite.

[0019] Bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite and tris(2,4-di-tert-butylphenyl)phosphite can capture free radicals in the system, interrupt the chain process of the oxidation reaction, and effectively prevent the herbicide molecules from being oxidized and decomposed under adverse conditions such as high temperature; the thermal stabilizer and carbon black act synergistically to effectively improve the thermal stability of the modified carbon black, provide better protection for the herbicide molecules, further enhance the stability of the herbicide composition, reduce the decomposition rate of the herbicide, and thus improve the weed control effect.

[0020] Preferably, the compound high-dispersibility emulsifier includes fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the anti-ultraviolet agent includes a benzotriazole anti-ultraviolet agent; and the antioxidant includes a hindered phenol antioxidant.

[0021] The synergistic effect of fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate enables the herbicide drug-carrying system to be evenly dispersed, improves the stability of the herbicide composition, reduces the aggregation and interaction of herbicide molecules, thereby reducing the impact of external factors on the herbicide, and further reducing the decomposition rate of the herbicide; good dispersibility enables the herbicide to contact the target more evenly, enhances the wettability and permeability to weeds, and further significantly improves the herbicide efficacy; benzotriazole anti-ultraviolet agents can effectively absorb ultraviolet rays, prevent ultraviolet rays from damaging the herbicide, and improve the stability of the herbicide composition; hindered phenol antioxidants can capture free radicals, inhibit the oxidative decomposition of the herbicide, and thus reduce the decomposition rate of the herbicide; the synergistic effect of the two improves the stability of the herbicide composition, and the stable system helps the herbicide to better exert its weeding effect, thereby improving the herbicide efficacy.

[0022] In a second aspect, the present application provides a method for preparing a herbicide composition, using the following technical solution: A method for preparing a herbicide composition comprises the following steps: The carbon black, the anti-ultraviolet agent, the antioxidant and the filler are mixed, stirred evenly, and then the herbicide drug-carrying system and the compound high-dispersibility emulsifier are added, and stirred evenly to obtain a mixture; the mixture is mechanically crushed and air-flow crushed, and then dried, sieved and packaged to obtain a herbicide composition.

[0023] The herbicide composition prepared according to the above steps has good dispersibility and stability, can effectively reduce the decomposition rate of the herbicide, and improve its stability, thereby providing a high-efficiency and long-lasting weed control effect.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The herbicide delivery system effectively loads the herbicide, which can promote the uniform dispersion of the herbicide components and control the release rate. Through the protection of the carrier, it can reduce the impact of the environment on the herbicide, improve the stability of the herbicide, and thus reduce the decomposition rate; carbon black has high thermal conductivity, can quickly dissipate heat, reduce the accumulation of heat near the herbicide molecules, and improve its thermal stability. At the same time, it can act as a physical barrier to play an adsorption and barrier role, reducing the impact of external factors on the herbicide; the anti-ultraviolet agent can effectively block the destructive effect of ultraviolet rays, and the antioxidant inhibits the oxidation reaction. The two synergistically reduce the decomposition rate of the herbicide; the compound high-dispersibility emulsifier can make the herbicide delivery system evenly dispersed, improve its stability, and reduce the decomposition rate of the herbicide, so that the herbicide composition can continuously and stably exert a high-efficiency weed control effect during use.

[0025] 2. The special structure of mesoporous silica provides a good loading environment for compound herbicides, significantly improves their stability, and can effectively block the influence of external factors such as oxygen, moisture and ultraviolet rays on herbicides, thereby reducing the decomposition rate of herbicides; at the same time, mesoporous silica can control the release rate of herbicides, so that they can play a role continuously and stably during use, thereby improving the herbicide efficacy; modified mesoporous silica is obtained after modification with dimethyldimethoxysilane. The modified mesoporous silica improves the dispersibility of the drug delivery system, so that the compound herbicide can be more evenly distributed in the system, providing it with a good protective layer, thereby effectively reducing the decomposition rate of the herbicide; at the same time, dimethyldimethoxysilane also improves the wettability of the drug delivery system, so that the drug delivery system can better contact with plant leaves, and the herbicide can more fully exert its weed control effect, thereby significantly improving the herbicide efficacy.

[0026] 3. The dispersant makes the modified carbon black have good dispersibility in the system and can be evenly distributed. As a physical barrier, it absorbs and blocks the influence of external factors on the herbicide, thereby improving the stability of the herbicide composition; the addition of the thermal stabilizer enhances the thermal stability of carbon black, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite and tris(2,4-di-tert-butylphenyl)phosphite can capture free radicals in the system and interrupt the chain process of the oxidation reaction. Under adverse conditions such as high temperature, the thermal stabilizer can effectively prevent the herbicide molecules from being oxidized and decomposed; the thermal stabilizer and carbon black work synergistically, effectively improving the thermal stability of the modified carbon black, providing better protection for the herbicide molecules, further enhancing the stability of the herbicide composition, and reducing the decomposition rate of the herbicide, thereby improving the weed control effect. DETAILED DESCRIPTION

[0027] The present application discloses an herbicide composition and a preparation method thereof. The dosage form of the herbicide composition in the present application includes but is not limited to emulsifiable granules, with clethodim and quizalofop-ethyl in a mass ratio of 1:1 as the compound herbicide. 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 below in conjunction with the examples: Raw material description: Mesoporous silica model is XFF43, purchased from Jiangsu Xianfeng Nanomaterial Technology Co., Ltd., carbon black fineness is 100 mesh, purchased from Shandong Boxin Chemical Co., Ltd., anti-ultraviolet agent model is UV-P (CAS No.: 2440-22-4), antioxidant model is antioxidant 1010 (CAS No.: 6683-19-8), filler is bentonite, dimethyl dimethoxy silane (CAS No.: 1112-39-6), dispersant is KH-550 (CAS No.: 919-30-2) , fatty alcohol polyoxyethylene ether (CAS No.: 68131-39-5), sodium dodecylbenzene sulfonate (CAS No.: 25155-30-0), bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite (CAS No.: 26741-53-7), tris(2,4-di-tert-butylphenyl) phosphite (CAS No.: 31570-04-4), organic tin catalyst is dibutyltin dilaurate (CAS No.: 77-58-7), Tween-80 (CAS No.: 9005-65-6).

[0028] Example 1 Preparation of herbicide delivery system The mesoporous silica is ultrasonically washed three times with anhydrous ethanol, and the pretreated mesoporous silica is obtained after drying in an oven; the pretreated mesoporous silica and the compound herbicide are injected into a container, the container is connected to a vacuum system, the vacuum pump is turned on, the vacuum is evacuated to -0.05MPa, and the system is stirred at a speed of 200rpm. After evacuating for 2h, the system is filtered to obtain a herbicide-loaded system, wherein the mass content of the loaded drug is about 50%.

[0029] Preparation of herbicide compositions 3g of carbon black, 0.5g of an anti-ultraviolet agent, 0.5g of an antioxidant and 10g of a filler are mixed, stirred and mixed at a speed of 400rpm for 20min, 40g of a herbicide delivery system and 5g of a composite high-dispersibility emulsifier are added, the mass ratio of fatty alcohol polyoxyethylene ether to sodium dodecylbenzene sulfonate in the composite high-dispersibility emulsifier is 7:3, the speed is increased to 600rpm and stirred for 30min to obtain a mixture; the mixture is mechanically crushed and airflow crushed, the mechanical crushing speed is 2000rpm, the crushing time is 8min, and the crushing is paused for 30s every 2min for heat dissipation. The flow rate of the airflow crushing is 250m / s, the crushing pressure is 0.6MPa, and the mixture is dried at 40°C, passed through a 40-mesh sieve, and packaged to obtain a herbicide composition.

[0030] Example 2 Preparation of herbicide delivery system The mesoporous silica is ultrasonically washed three times with anhydrous ethanol, and the pretreated mesoporous silica is obtained after drying in an oven; the pretreated mesoporous silica and the compound herbicide are injected into a container, the container is connected to a vacuum system, the vacuum pump is turned on, the vacuum is evacuated to -0.05MPa, and the system is stirred at a speed of 200rpm. After evacuating for 2h, the system is filtered to obtain a herbicide-loaded system, wherein the mass content of the loaded drug is about 50%.

[0031] Preparation of herbicide compositions 5g of carbon black, 1g of an anti-ultraviolet agent, 1g of an antioxidant and 15g of a filler are mixed, stirred and mixed at a speed of 400rpm for 20min, 50g of a herbicide delivery system and 15g of a composite highly dispersible emulsifier are added, the mass ratio of fatty alcohol polyoxyethylene ether to sodium dodecylbenzene sulfonate in the composite highly dispersible emulsifier is 7:3, the speed is increased to 600rpm and stirred for 30min to obtain a mixture; the mixture is mechanically crushed and air flow crushed, the mechanical crushing speed is 2000rpm, the crushing time is 8min, and the crushing is paused for 30s every 2min for heat dissipation. The flow rate of the air flow crushing is 250m / s, the crushing pressure is 0.6MPa, and the mixture is dried at 40°C, and packaged after passing through a 40-mesh sieve to obtain a herbicide composition.

[0032] Example 3 Preparation of herbicide delivery system The mesoporous silica is ultrasonically washed three times with anhydrous ethanol, and the pretreated mesoporous silica is obtained after drying in an oven; the pretreated mesoporous silica and the compound herbicide are injected into a container, the container is connected to a vacuum system, the vacuum pump is turned on, the vacuum is evacuated to -0.05MPa, and the system is stirred at a speed of 200rpm. After evacuating for 2h, the system is filtered to obtain a herbicide-loaded system, wherein the mass content of the loaded drug is about 50%.

[0033] Preparation of herbicide compositions 4g of carbon black, 0.75g of an anti-ultraviolet agent, 0.75g of an antioxidant and 12.5g of a filler are mixed, stirred and mixed at a speed of 400rpm for 20min, 45g of a herbicide delivery system and 10g of a composite high-dispersibility emulsifier are added, the mass ratio of fatty alcohol polyoxyethylene ether to sodium dodecylbenzene sulfonate in the composite high-dispersibility emulsifier is 7:3, the speed is increased to 600rpm and stirred for 30min to obtain a mixture; the mixture is mechanically crushed and airflow crushed, the mechanical crushing speed is 2000rpm, the crushing time is 8min, and the crushing is paused for 30s every 2min for heat dissipation. The flow rate of the airflow crushing is 250m / s, the crushing pressure is 0.6MPa, and the mixture is dried at 40°C, passed through a 40-mesh sieve, and packaged to obtain a herbicide composition.

[0034] Preparation Example 1 Preparation of modified mesoporous silica 47.62 g of mesoporous silica and 2.38 g of dimethyldimethoxysilane were mixed and dispersed in 500 mL of anhydrous ethanol. Under the conditions of stirring at 40°C and 200 rpm, 5 mL of deionized water was added. The pH was adjusted to 4 with hydrochloric acid. After reacting for 2 h, the product was filtered and washed three times with anhydrous ethanol. After drying in an oven, modified mesoporous silica was obtained.

[0035] Preparation Example 2 Preparation Example 2 is based on Preparation Example 1. The only difference between Preparation Example 2 and Preparation Example 1 is that the amount of mesoporous silica used in Preparation Example 2 is 45.45 g, and the amount of dimethyldimethoxysilane used is 4.55 g.

[0036] Preparation Example 3 Preparation Example 3 is based on Preparation Example 1. The only difference between Preparation Example 3 and Preparation Example 1 is that the amount of mesoporous silica used in Preparation Example 3 is 46.51 g, and the amount of dimethyldimethoxysilane used is 3.49 g.

[0037] Preparation Example 4 Preparation Example 4 is based on Preparation Example 1. The only difference between Preparation Example 4 and Preparation Example 1 is that the amount of mesoporous silica used in Preparation Example 4 is 49.02 g, and the amount of dimethyldimethoxysilane used is 0.98 g.

[0038] Preparation Example 5 Preparation Example 5 is based on Preparation Example 1. The only difference between Preparation Example 5 and Preparation Example 1 is that the amount of mesoporous silica used in Preparation Example 5 is 44.64 g, and the amount of dimethyldimethoxysilane used is 5.36 g.

[0039] Example 4 Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that in Example 4, the mesoporous silica is replaced by the modified mesoporous silica prepared in Preparation Example 1.

[0040] Example 5 Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that in Example 5, the mesoporous silica is replaced by the modified mesoporous silica prepared in Preparation Example 2.

[0041] Example 6 Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that in Example 6, the mesoporous silica is replaced by the modified mesoporous silica prepared in Preparation Example 3.

[0042] Example 7 Example 7 is based on Example 3. The only difference between Example 7 and Example 3 is that in Example 7, the mesoporous silica is replaced by the modified mesoporous silica prepared in Preparation Example 4.

[0043] Example 8 Example 8 is based on Example 3. The only difference between Example 8 and Example 3 is that in Example 8, the mesoporous silica is replaced by the modified mesoporous silica prepared in Preparation Example 5.

[0044] Preparation Example 6 Preparation of modified carbon black Disperse 10 g of carbon black and 1 g of dispersant in 100 mL of anhydrous ethanol, add 5 mL of deionized water, adjust the pH to 4 with hydrochloric acid, stir and react at 60 ° C at 200 rpm for 2 h, filter, wash with anhydrous ethanol, and dry in an oven at 80 ° C to obtain highly dispersed carbon black.

[0045] 8 g of highly dispersed carbon black and 2 g of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite were mixed and dispersed in xylene, 0.1 g of organic tin catalyst was added, and the mixture was stirred at 80°C and 200 rpm for 2 h. After filtering, it was dried in an oven at 80°C to obtain modified carbon black.

[0046] Preparation Example 7 Preparation Example 7 is based on Preparation Example 6. The only difference between Preparation Example 7 and Preparation Example 6 is that in Preparation Example 7, bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is replaced by tris(2,4-di-tert-butylphenyl)phosphite.

[0047] Example 9 Example 9 is based on Example 3. The only difference between Example 9 and Example 3 is that in Example 9, the carbon black is replaced by the modified carbon black prepared in Preparation Example 6.

[0048] Example 10 Example 10 is based on Example 3, and the only difference between Example 10 and Example 3 is that in Example 10, carbon black is replaced by modified carbon black prepared in Preparation Example 7.

[0049] Comparative Example 1 Comparative Example 1 is based on Example 3, and the only difference between Comparative Example 1 and Example 3 is that no anti-ultraviolet agent is added in Comparative Example 1.

[0050] Comparative Example 2 Comparative Example 2 is based on Example 3, and the only difference between Comparative Example 2 and Example 3 is that no antioxidant is added in Comparative Example 2.

[0051] Comparative Example 3 Comparative Example 3 is based on Example 3, and the only difference between Comparative Example 3 and Example 3 is that in Comparative Example 3, the compound high-dispersibility emulsifier is replaced by Tween-80.

[0052] Performance testing (1) GB / T 22615-2008 Herbicide Composition and GB / T 19136-2021 Determination of Thermal Storage Stability of Pesticides were selected as the standards. The samples were stored at (54±2)°C for 14 days. The mass content of the compound herbicide in the samples before and after storage was tested, and the decomposition rate was calculated. Each sample was tested three times, and the average value was taken after measurement. The results are recorded in Table 1.

[0053] (2) The NY / T 1155.4-2006 Activity Determination Test Stem and Leaf Spray Method was selected as the standard to test the control effect of the sample on barnyard grass and crabgrass. The sample was diluted and applied at a rate of 0.2 mL / m 2 The protective effect was calculated 21 days after application and the results are recorded in Table 1.

[0054] Table 1 Test results of thermal storage decomposition rate and weed control effect of herbicide composition Test results Decomposition rate after hot storage (%) Barnyard grass control effect (%) Crabgrass control effect (%) Example 1 1.1 87.9 87.7 Example 2 1.2 88.5 88.1 Example 3 1.0 88.2 87.8 Example 4 1.0 93.6 93.2 Example 5 1.1 93.3 92.7 Example 6 1.0 94.1 93.5 Example 7 1.1 91.2 91.4 Example 8 1.4 90.6 90.3 Example 9 0.8 95.0 94.8 Example 10 0.7 95.3 95.1 Comparative Example 1 1.9 82.6 83.1 Comparative Example 2 2.1 81.9 81.4 Comparative Example 3 1.6 78.6 79.3 As shown in Table 1, the decomposition rate after hot storage of Examples 1-3 is less than 1.2%, the barnyard grass control effect is greater than 87.9%, and the crabgrass control effect is greater than 87.7%, which shows that the herbicide composition prepared in the present application has good stability and weed control effect.

[0055] As can be seen from Table 1, the only difference between Example 4-8 and Example 3 is that: in Example 4-8, the mesoporous silica is modified, and compared with Example 3, the stability and weed control effect of the herbicide composition in Example 4-8 are improved; this is because the mesoporous silica is modified to improve its dispersibility and wettability, thereby improving the effect on the target. It can be seen from Example 4-6 that the modification effect within the limited range is good, and the performance of the modified mesoporous silica is effectively improved; Examples 7 and 8 destroy the limited range, too little dimethyldimethoxysilane reduces the modification effect, and too much dimethyldimethoxysilane affects the pore structure of the mesoporous silica, which may be stacked in the drug-carrying pores, affecting the drug-carrying effect, so that the stability and weed control effect of Examples 7 and 8 are reduced.

[0056] As can be seen from Table 1, the only difference between Examples 9 and 10 and Example 3 is that in Example 9, the carbon black is replaced by the modified carbon black prepared in Preparation Example 6, and in Example 10, the carbon black is replaced by the modified carbon black prepared in Preparation Example 7. Compared with Example 3, Examples 9 and 10 have improved stability and herbicidal effects. This is because the carbon black is modified using a dispersant and a thermal stabilizer, and the modified carbon black has better thermal stability, can physically block and absorb adverse factors of the external environment for the compound herbicide, and improve the stability of the herbicide composition, thereby improving the herbicidal effect.

[0057] As can be seen from Table 1, the only difference between Comparative Examples 1 and 2 and Example 3 is that: Comparative Example 1 does not add an anti-ultraviolet agent, and Comparative Example 2 does not add an antioxidant. Compared with Example 3, the stability and herbicidal effect of Comparative Examples 1 and 2 are reduced; this is because without adding an anti-ultraviolet agent or an antioxidant, the synergistic effect of the two is weakened, and the synergistic effect with carbon black is also reduced. The compound herbicide is more susceptible to decomposition due to external factors, thereby increasing the decomposition rate and reducing the herbicidal effect.

[0058] As can be seen from Table 1, the only difference between Comparative Example 3 and Example 3 is that in Comparative Example 3, the compound highly dispersible emulsifier is replaced by Tween-80. Compared with Example 3, the stability and the herbicidal effect of Comparative Example 3 are reduced. This is because the compound highly dispersible emulsifier is replaced by Tween-80, which lacks the effect of compound synergy, and the dispersibility and wettability of the herbicide composition are reduced, thereby reducing the stability and the herbicidal effect.

[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 herbicide composition, characterized in that: The raw materials for preparation include the following components in parts by weight: 40-50 copies of herbicide delivery system 3-5 parts of carbon black Anti-ultraviolet agent 0.5-1 part 0.5-1 part antioxidant Compound high dispersibility emulsifier 5-15 parts 10-15 parts of filler.

2. A herbicide composition according to claim 1, characterized in that: The raw materials for preparing the herbicide drug-carrying system include compound herbicides and mesoporous silica.

3. A herbicide composition according to claim 2, characterized in that: The compound herbicide includes one or more of clethodim, fomesulfuron, metolachlor, chloranil, clopyralid, metribuzin, sulfamethoxam, glufosinate, quizalofop-P-ethyl, fluazifop-P-ethyl, and imazamox.

4. A herbicide composition according to claim 3, characterized in that: The herbicide delivery system is prepared by the following steps: The mesoporous silica is ultrasonically washed with anhydrous ethanol and dried in an oven to obtain pretreated mesoporous silica; the pretreated mesoporous silica and the herbicide composition are mixed, vacuumed and stirred, and filtered to obtain the herbicide drug-carrying system.

5. A herbicide composition according to claim 4, characterized in that: The mesoporous silica is subjected to modification treatment to obtain modified mesoporous silica, and the raw materials for preparing the modified mesoporous silica include mesoporous silica body and dimethyldimethoxysilane.

6. A herbicide composition according to claim 5, characterized in that: The mass ratio of the mesoporous silica body to dimethyldimethoxysilane is 1:(0.05-0.1).

7. A herbicide composition according to claim 1, characterized in that: The carbon black is subjected to modification treatment to obtain modified carbon black, and the raw materials for preparing the modified carbon black include carbon black body, dispersant and heat stabilizer.

8. A herbicide composition according to claim 7, characterized in that: The heat stabilizer includes one of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite and tris(2,4-di-tert-butylphenyl)phosphite.

9. A herbicide composition according to claim 1, characterized in that: The compound high-dispersibility emulsifier includes fatty alcohol polyoxyethylene ether and sodium dodecylbenzene sulfonate; the anti-ultraviolet agent includes benzotriazole anti-ultraviolet agent; and the antioxidant includes hindered phenol antioxidant.

10. A method for preparing the herbicide composition according to any one of claims 1 to 9, characterized in that: The steps include: The carbon black, the anti-ultraviolet agent, the antioxidant and the filler are mixed, stirred evenly, and then the herbicide drug-carrying system and the compound high-dispersibility emulsifier are added, and stirred evenly to obtain a mixture; the mixture is mechanically crushed and air-flow crushed, and then dried, sieved and packaged to obtain a herbicide composition.