Application of bimidalzole-based polyionic liquid functionalized hydrothermal carbon in preparation of pesticide slow-release agent

Abstract

The application discloses application of a bimidazolyl polyionic liquid functionalized hydrothermal carbon in preparation of a pesticide slow-release agent, and a preparation method of the functionalized hydrothermal carbon comprises the following steps: adopting a hydrothermal carbonization method to perform carbonization reaction on bamboo powder and a hydrochloric acid solution, stirring a product obtained through the reaction with lye, filtering and washing with water until a filtrate is neutral, and obtaining hydrothermal bamboo carbon; dichloromethane and 1-vinylimidazole are put into a reaction kettle to react, and a monomer N,N'-methylene-di(1-(3-vinylimidazole))chloride (DVim-Cl) is prepared after the reaction is completed; the above hydrothermal bamboo carbon and the DVim-Cl are taken, an initiator and a solvent are added, and the mixture is put into a reaction kettle to perform heating reaction, and a target compound is obtained. The slow-release agent prepared by the application can effectively load herbicides, has good herbicidal activity, the loading capacity can be up to 565 mg / g, the loading rate can be up to 36.1%, and the slow-release agent has a good application prospect in the field of pesticide slow release.

Description

Technical Field

[0001] The present invention relates to an application of functionalized hydrothermal carbon, and in particular to an application of bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide slow-release agent. Background Art

[0002] The widespread use of pesticides in agriculture to control pests, fungi, and weeds has had serious negative impacts on both ecological balance and public health. Therefore, more effective and safer pesticide application methods are needed to address these issues. Traditional pesticide formulations rapidly lose efficacy after release, causing significant environmental damage. For example, emulsifiable concentrates (ECs) require the use of large amounts of benzene-based solvents, while dusts and wettable powders (WPs) generate dust pollution. These formulations pollute the environment and pose health risks to applicators. Furthermore, their short duration of effectiveness requires increased application rates and frequency, leading to higher production costs and increased pesticide residues. They can also contribute to the development of pest resistance and shorten the pesticide's useful life. Therefore, appropriate application methods are essential to prevent pesticide contamination. One effective approach is the development of controlled-release formulations (CRFs), which have garnered increasing attention in recent years. CRFs can maintain pesticide levels above effective levels for extended periods, which can help reduce herbicide consumption and enhance its bioactivity.

[0003] Adsorption-type sustained-release formulations are pesticide formulations that utilize an adsorbent carrier as a reservoir for the pesticide. Adsorbing the herbicide onto the carrier prevents unnecessary loss of highly water-soluble herbicides such as 2,4-D Na. Encapsulating the herbicide within a suitable carrier enhances the effectiveness of the active ingredient and improves its photostability. Therefore, developing a highly effective adsorption-type sustained-release formulation is a pressing technical challenge. Summary of the Invention

[0004] Purpose of the invention: The present invention aims to provide an application of a bisimidazolyl polyionic liquid hydrothermal carbon in the preparation of a pesticide sustained-release agent. The functionalized hydrothermal carbon can improve the weed control efficiency and reduce the side effects of pesticides during the sustained-release process of pesticides.

[0005] Technical solution: The application of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to the present invention, and the preparation method of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon comprises the following steps:

[0006] (1) using a hydrothermal carbonization method to carbonize bamboo powder and hydrochloric acid solution, adding alkali solution to the reaction product and stirring, filtering and washing with water until the filtrate is neutral, thereby obtaining hydrothermal bamboo charcoal;

[0007] Dichloromethane and 1-vinylimidazole were placed in a reactor for reaction. After the reaction was completed, the mixture was filtered to obtain monomer N,N'-methylene-bis(1-(3-vinylimidazole)) chloride (DVim-Cl).

[0008] (2) Take the above hydrothermal bamboo charcoal and DVim-Cl, add an initiator and a solvent, put them into a reactor and heat them for reaction to obtain the product, bisimidazolyl polyionic liquid functionalized hydrothermal charcoal.

[0009] The synthetic route of the above reaction is as follows:

[0010]

[0011] Furthermore, the concentration of the bamboo powder in the hydrochloric acid solution in step (1) is 0.2-0.3 g / mL, and the concentration of hydrochloric acid is 0.5-1.0 mol / L.

[0012] Furthermore, the reaction temperature of the carbonization reaction in step (1) is 200-220° C., the carbonization time is 12-24 hours, and the alkali solution stirring time is 2-4 hours; the alkali solution is a sodium hydroxide solution with a concentration of 0.2-0.25 mol / L.

[0013] Furthermore, in step (1), the molar ratio of dichloromethane to 1-vinylimidazole is 1-3:2-4, the reaction temperature is 100-120° C., and the reaction time is 12-80 h.

[0014] Furthermore, when synthesizing the N,N'-methylene-bis(1-(3-vinylimidazole)) chloride monomer, a low-temperature solvent-free method can be selected for preparation, or an additional solvent (such as tetrahydrofuran, acetonitrile, etc.) can be added in addition to the two raw materials for preparation; among them, the low-temperature solvent-free method is preferably used to synthesize the N,N'-methylene-bis(1-(3-vinylimidazole)) chloride monomer, which can achieve green environmental protection, improve reaction efficiency, and reduce production costs.

[0015] Furthermore, in step (2), the mass ratio of the hydrothermal carbon, DVim-Cl and initiator is 10-12:15-25:1.4-2.5.

[0016] Furthermore, the solvent in step (2) is a mixed solvent of water and dimethyl sulfoxide, and the volume ratio of water to dimethyl sulfoxide is 1-2:1-2.

[0017] Furthermore, after the reaction in step (2) is completed, the product is first filtered, then washed with anhydrous ethyl acetate, and the filter residue is dried to obtain the target compound.

[0018] Furthermore, the drying temperature is 60-80°C.

[0019] Furthermore, the pesticide slow-release agent includes bisimidazolyl polyionic liquid functionalized hydrothermal carbon, the bisimidazolyl polyionic liquid functionalized hydrothermal carbon is a pesticide carrier, and the pesticide is 2,4-D sodium.

[0020] Furthermore, the pesticide slow-release agent includes Cl - Salts such as iodine and thiazolinone are used to adjust the sustained-release rate of pesticides.

[0021] Furthermore, the pesticide slow-release agent can also be controllably released by adjusting the pH, pH=5-7.

[0022] Principle of the invention: The surface of hydrochar contains abundant functional groups such as hydroxyl and carboxyl groups. Introducing nitrogen-containing groups into the surface of hydrochar can change the surface potential and polarity of the hydrochar, resulting in a positively charged and hydrophilic sustained-release agent, thereby improving the adsorption and loading capacity of the modified hydrochar for anionic pesticides through electrostatic interactions. The present invention uses azobisisobutyronitrile as an initiator and initiates the graft copolymerization of N,N'-methylene-bis(1-(3-vinylimidazole)) chloride on the surface of hydrochar through a low-temperature solvothermal method to prepare poly(N,N'-methylene-bis(1-(3-vinylimidazole)) chloride) functionalized hydrochar, thereby obtaining a bisimidazolyl polyionic liquid functionalized hydrochar carrier. The Zeta potential of the bisimidazolyl polyionic liquid functionalized hydrochar carrier changes significantly with the change of solution pH. The electrostatic and other interactions between the carrier and the pesticide 2,4-D Na are affected by changes in environmental pH and ionic strength, thereby endowing the pesticide sustained-release agent with multiple stimulus responsiveness to pH and ionic strength. By controlling the pH or ionic strength of the environment, controlled release of pesticide slow-release agents can be achieved.

[0023] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) N,N'-methylene-bis(1-(3-vinylimidazole)) chloride monomer is synthesized by a low-temperature solvent-free method, which is green and environmentally friendly, improves reaction efficiency, and reduces production costs; (2) The slow-release agent has stable performance, and the low-temperature solvent thermal method is used to synthesize the bisimidazolyl polyionic liquid functionalized hydrothermal carbon, which shows a loading amount of up to 565 mg / g for the pesticide 2,4-D Na, and the loading rate reaches more than 36%; (3) The slow-release agent can regulate the drug release rate by changing the pH and ionic strength, prolong the drug effect period, and the duration can reach more than 35 hours, which can improve the utilization efficiency of the herbicide; (4) The carrier raw material is waste biomass, which is widely available and low in price. The method for preparing hydrothermal bamboo charcoal is a hydrothermal method, and the reaction process is carried out under closed conditions, which is environmentally friendly; (5) The preparation method and equipment of the slow-release agent are simple, and it is expected to be widely used in the agricultural field. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1FTIR spectra of hydrothermal bamboo charcoal (HC), bisimidazolyl polyionic liquid functionalized hydrothermal bamboo charcoal slow-release carrier (BIPIL-HC), N,N'-methylene-bis(1-(3-vinylimidazole)) chloride (DVim-Cl), bisimidazolyl polyionic liquid functionalized hydrothermal charcoal pesticide slow-release agent (BIPIL-HC-2,4-D Na), and pesticide 2,4-D Na;

[0025] Figure 2 Figure 2 is the loading capacity of BIPIL-HC for different initial concentrations of 2,4-D Na;

[0026] Figure 3 Zeta potential of BIPIL-HC and its loading capacity for 2,4-D Na at different pH values;

[0027] Figure 4 Figure 2 is a study on the sustained release behavior of BIPIL-HC-2,4-D Na in different solutions; wherein, a) is the sustained release graph of BIPIL-HC-2,4-D Na at different pH values, and b) is the sustained release graph of BIPIL-HC-2,4-D Na in saline solution;

[0028] Figure 5 This is a diagram showing the herbicidal activity study of BIPIL-HC-2,4-D Na. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0030] Example 1

[0031] The preparation method of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon pesticide sustained-release agent is as follows:

[0032] 40 g of bamboo powder was weighed and placed in a 500 mL polytetrafluoroethylene-lined autoclave. 160 mL of 1 mol / L hydrochloric acid solution was added and stirred evenly. The mixture was reacted at 200 ° C for 24 h, cooled, filtered, and washed with deionized water. 400 mL of 0.2 mol / L sodium hydroxide solution was added and stirred for 2 h. The mixture was cooled, filtered, and washed with deionized water until the filtrate reached a stable pH value. The mixture was filtered and dried at 60 ° C to obtain hydrothermal bamboo charcoal (HC).

[0033] 9.41 g of 1-vinylimidazole and 6.37 g of dichloromethane were weighed and evenly stirred in a 100 mL polytetrafluoroethylene-lined autoclave. The mixture was reacted at 100° C. for 72 h, cooled, and filtered to obtain the monomer N,N′-methylene-bis(1-(3-vinylimidazole) chloride) (DVim-Cl).

[0034] 1 g of hydrothermal bamboo charcoal, 2.5 g of DVim-Cl, 0.25 g of azobisisobutyronitrile, and 10 ml of a mixed solution of deionized water and dimethyl sulfoxide were weighed separately with a volume ratio of 1:1. The mixture was poured into a 100 mL polytetrafluoroethylene-lined high-pressure reactor and heated at 100 °C for 24 h. After cooling to room temperature, the mixture was filtered and washed with deionized water until neutral. The obtained sample was dried in an oven at 60 °C to obtain a bisimidazolyl polyionic liquid functionalized hydrothermal charcoal pesticide sustained-release carrier (BIPIL-HC).

[0035] Example 2

[0036] The preparation method of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon pesticide sustained-release agent is as follows:

[0037] 40 g of bamboo powder was weighed into a 500 mL polytetrafluoroethylene-lined autoclave, 180 mL of 1 mol / L hydrochloric acid solution was added, and the mixture was stirred evenly. After reacting at 200 ° C for 24 h, the mixture was cooled, filtered, and washed with deionized water. After filtering, 400 mL of 0.2 mol / L sodium hydroxide solution was added and stirred for 2 h. The mixture was cooled, filtered, and washed with deionized water until the filtrate reached a stable pH value. The mixture was filtered and dried at 60 ° C to obtain hydrothermal bamboo charcoal (HC);

[0038] 9.41 g of 1-vinylimidazole and 6.37 g of dichloromethane were weighed and stirred evenly in a 100 mL polytetrafluoroethylene-lined autoclave. The mixture was reacted at 100° C. for 72 h, cooled, filtered, and washed with anhydrous ethyl acetate to obtain the monomer N,N′-methylene-bis(1-(3-vinylimidazole) chloride) (DVim-Cl).

[0039] 1 g of hydrothermal bamboo charcoal, 2 g of DVim-Cl, 0.14 g of azobisisobutyronitrile, and 10 ml of a mixed solution of deionized water and dimethyl sulfoxide were weighed separately with a volume ratio of 1:1. The mixture was poured into a 100 mL high-pressure reactor lined with polytetrafluoroethylene and heated at 100 °C for 24 h. After cooling to room temperature, the mixture was filtered and washed with deionized water until neutral. The obtained sample was dried in an oven at 60 °C to obtain a bisimidazolyl polyionic liquid functionalized hydrothermal charcoal pesticide sustained-release carrier (BIPIL-HC).

[0040] Example 3

[0041] The preparation method of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon pesticide sustained-release agent is as follows:

[0042] 40 g of bamboo powder was weighed and placed in a 500 mL polytetrafluoroethylene-lined autoclave. 200 mL of 1 mol / L hydrochloric acid solution was added and stirred evenly. The mixture was reacted at 200 ° C for 24 h, cooled, filtered, and washed with deionized water. 400 mL of 0.2 mol / L sodium hydroxide solution was added and stirred for 2 h. The mixture was cooled, filtered, and washed with deionized water until the filtrate reached a stable pH value. The mixture was filtered and dried at 60 ° C to obtain hydrothermal bamboo charcoal (HC).

[0043] 9.41 g of 1-vinylimidazole and 6.37 g of dichloromethane were weighed and stirred evenly in a 100 mL polytetrafluoroethylene-lined autoclave. The mixture was reacted at 100° C. for 72 h, cooled, filtered, and washed with anhydrous ethyl acetate to obtain the monomer N,N′-methylene-bis(1-(3-vinylimidazole)) chloride (DVim-Cl).

[0044] 1 g of hydrothermal bamboo charcoal, 2.5 g of DVim-Cl, 0.25 g of azobisisobutyronitrile, and 20 ml of a mixed solution of deionized water and dimethyl sulfoxide were weighed separately with a volume ratio of 1:1. The mixture was poured into a 100 mL high-pressure reactor lined with polytetrafluoroethylene and heated at 100 ° C for 24 h. After cooling to room temperature, the mixture was filtered and washed with deionized water until neutral. The obtained sample was dried in an oven at 60 ° C to obtain a bisimidazolyl polyionic liquid functionalized hydrothermal charcoal pesticide sustained-release carrier (BIPIL-HC).

[0045] The following is a structural characterization and test result analysis of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon pesticide sustained-release agent prepared in Example 1.

[0046] (1) FTIR

[0047] The hydrothermal bamboo charcoal and its samples before and after modification, before and after loading pesticides were characterized by infrared spectroscopy. Figure 1 The steps for preparing a sustained-release agent by loading the hydrothermal bamboo charcoal with a pesticide are as follows: 0.40 g of the hydrothermal bamboo charcoal pesticide sustained-release carrier of Example 1 was weighed into a conical flask, and 500 ml of a 500 mg / L 2,4-D Na solution was added. The mixture was shaken in an oscillator at 100 rpm for 12 hours, filtered, and dried to obtain a 2,4-D Na sustained-release agent (BIPIL-HC-2,4-D Na). The curves in the figure represent: hydrothermal bamboo charcoal (HC), N,N'-methylene-bis(1-(3-vinylimidazole)) chloride (DVim-Cl), bisimidazolyl polyionic liquid-functionalized hydrothermal charcoal pesticide sustained-release carrier (BIPIL-HC), bisimidazolyl polyionic liquid-functionalized hydrothermal charcoal pesticide sustained-release agent (BIPIL-HC-2,4-D Na), and the pesticide 2,4-D Na.

[0048] HC at 3406, 2958, 1689, 1614 and 1384 cm–1 The characteristic peaks at represent the stretching vibrations of O–H, aliphatic C–H, C=O and C=C, and the bending vibrations of methylene, respectively.

[0049] DVim-Cl at 1648, 1561, and 1172 cm –1 The characteristic peaks at 935cm are C=N, C=C and C–N stretching vibrations of imidazole. –1 The peak at 935cm is the C–H bending vibration peak of vinyl. After HC modification, the peak changed significantly. The characteristic peak of imidazole appeared on the surface of BIPIL-HC at 935cm –1 The C–H bending vibration peak of the vinyl group disappears, confirming that the vinyl group participates in the cross-linking polymerization.

[0050] 2,4-D Na at 1620, 1481, 1337, 1038 and 795 cm –1 The characteristic peaks at the bottom of the graph are the C=C stretching vibration, C–H plane bending vibration, carboxylate, C–O–C, and C–Cl stretching vibrations on the aromatic ring. After loading 2,4-D Na, the characteristic peaks are red-shifted to 1613, 1346, and 805 cm –1 . This indicates that 2,4-D Na is loaded on BIPIL-HC.

[0051] (2) Effect of initial concentration on adsorption

[0052] 40 mg of BIPIL-HC and 50 mL of 2,4-D Na solution (25, 50, 100, 200, 300, 400, 500, 600, 700, 800, 900 mg / L, T = 298 K, pH = 5) were oscillated for 12 h, and the loading capacity at different initial concentrations was measured and calculated.

[0053] Figure 2 Figure 3 shows the effect of initial concentration on the loading of 2,4-D Na on BIPIL-HC. As can be seen from the figure, with the increase of concentration, the loading amount of 2,4-D Na increases significantly. At 298 K, as the initial concentration increases from 25 mg / L to 900 mg / L, the loading amount increases from 28.35 mg / g to 565.10 mg / g.

[0054] (3) Zeta potential of BIPIL-HC and its loading capacity for 2,4-D Na at different pH values

[0055] The Zeta potential of BIPIL-HC varies from +35.2 eV to -3.17 eV in the pH range of 2 to 12. PZC ) is around 11.5. Figure 3As shown in Figure 2, when pH < 11.5, BIPIL-HC exhibits a positive charge, and vice versa. PZC The results showed that BIPIL-HC can load the pesticide 2,4-D Na in a wide pH range. When the pH value of the solution is in the range of 4-9, it shows a higher loading capacity for 2,4-D Na.

[0056] (4) Effects of different environmental conditions on the sustained-release behavior of BIPIL-HC-2,4-D Na sustained-release agent

[0057] To investigate the sustained release of BIPIL-HC-2,4-D Na, 40.0 mg of BIPIL-HC-2,4-D Na (2,4-D Na loading rate, 36.1%) was weighed and added to an 8000 g / mol molecular weight cutoff dialysis bag. The bag was placed in a 250-ml beaker, and 150 mL of sustained-release solutions (pH = 5.0, 7.0, and 9.0, adjusted with 0.1 M NaOH and 0.1 M HCl) or saline solution (0.02 M NaCl, pH approximately 7.0) was added. The mixture was shaken at 100 rpm in a shaker at room temperature. At regular intervals, 5 mL of the supernatant was removed and 5 mL of the same solution was added. The filtrate was then measured using a UV-visible spectrophotometer at a wavelength of 229.5 nm, and the cumulative release rate was calculated according to the formula.

[0058] Depend on Figure 4 a) It can be seen that the cumulative release rate of 2,4-D Na in BIPIL-HC-2,4-D Na sustained-release agent increases gradually with time under different pH conditions. The sustained-release rate after 35 hours is 23.09% to 31.09% under the condition of pH = 5.0 to 7.0, and the sustained-release rate after 35 hours is 85.10% under the condition of pH = 9.0. The release is faster in pH = 9.0 than in pH = 5.0 to 7.0. Figure 4 a) It can be seen that the pH of the solution has a great influence on the sustained release ability of BIPIL-HC-2,4-D Na.

[0059] Depend on Figure 4b) As can be seen, the effect of ionic strength on release performance was investigated using 0.02M NaCl solution and water as controls as release media. The release rate of BIPIL-HC-2,4-D Na in 0.02M NaCl was significantly different from that in deionized water. The cumulative release rate reached equilibrium after 34 hours using 0.02M NaCl as the release medium, while the cumulative release rate in deionized water was only 22% after 34 hours. Therefore, ionic strength significantly affects the release rate of BIPIL-HC-2,4-D Na. The release of BIPIL-HC-2,4-D Na showed a clear dual response to pH and ionic strength.

[0060] (5) Herbicidal activity

[0061] Weigh 0.40 g of the above-mentioned hydrothermal carbon pesticide sustained-release carrier into a conical flask and add 500 ml of 500 mg / L 2,4-D Na solution. Oscillate in an oscillator at 100 rpm for 12 h, filter, and dry to obtain a 2,4-D Na sustained-release agent (BIPIL-HC-2,4-D Na).

[0062] Five sets of 9-cm-diameter Petri dishes were prepared, each containing 10 ml of a test solution (a: deionized water, b: 100 ppm 2,4-D Na solution, c: 0.02 M NaCl solution, d: deionized water + BIPIL-HC-2,4-D Na, and e: 0.02 M NaCl solution + BIPIL-HC-2,4-D Na. The amount of 2,4-D Na in groups b and d / e was identical, and the amount of sustained-release agent carrier was the same in groups d and e). The Petri dishes were then lined with a layer of filter paper, and 10 rapeseed seeds were placed on each filter paper. The seeds were grown in an incubator at 26°C, 85% humidity, and 3000 lux of light. The first three days were in complete darkness, followed by a 12 / 12 day / night cycle for the next five days. Root length of rapeseed grown under different conditions was measured, and the fresh and dry weights of the seeds were compared.

[0063] like Figure 5 As shown, a 0.02M NaCl solution had no adverse effects on rapeseed growth and significantly promoted rhizome growth. Furthermore, BIPIL-HC had no significant effect on rapeseed growth, demonstrating its good biosafety and suitability as a pesticide carrier. Regarding rapeseed growth, root length, fresh weight, and dry weight were all lower after application of BIPIL-HC-2,4-DNa in a 0.02M NaCl medium than after application of a 2,4-DNa aqueous solution at the same dose and concentration. These results demonstrate that BIPIL-HC-2,4-DNa exhibits robust herbicidal activity and is influenced by the ionic strength of the release medium.

Claims

1. Application of a bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent, characterized in that: The preparation method of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon comprises the following steps: (1) using a hydrothermal carbonization method to carbonize bamboo powder and hydrochloric acid solution, adding alkali solution to the reaction product and stirring, filtering and washing with water until the filtrate is neutral, thereby obtaining hydrothermal bamboo charcoal; Dichloromethane and 1-vinylimidazole are placed in a reaction vessel to react, and after the reaction is completed, monomer N,N'-methylene-bis(1-(3-vinylimidazole)) chloride is obtained; (2) Take the above hydrothermal bamboo charcoal and N,N'-methylene-bis(1-(3-vinylimidazole)) chloride, add initiator and solvent, put them into a reactor and heat them for reaction to obtain the product bisimidazolyl polyionic liquid functionalized hydrothermal charcoal.

2. The use of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to claim 1, characterized in that: The concentration of the bamboo powder in the hydrochloric acid solution in step (1) is 0.2-0.3 g / mL, and the concentration of the hydrochloric acid solution is 0.5-1.0 mol / L.

3. The use of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to claim 1, characterized in that: The reaction temperature of the carbonization reaction in step (1) is 200-220° C., the carbonization time is 12-24 hours, and the alkali solution stirring time is 2-4 hours.

4. The use of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to claim 1, characterized in that: The alkali solution in step (1) is a sodium hydroxide solution with a concentration of 0.2-0.25 mol / L.

5. The use of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to claim 1, characterized in that: The molar ratio of dichloromethane to 1-vinylimidazole in step (1) is 1-3:2-4.

6. The use of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to claim 1, characterized in that: In step (1), the reaction temperature of the reaction between dichloromethane and 1-vinylimidazole is 100-120° C., and the reaction time is 12-80 h.

7. The use of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to claim 1, characterized in that: After the reaction in step (2) is completed, the mixture is filtered and then washed with anhydrous ethyl acetate. The filter residue is dried to obtain the target compound.

8. The use of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to claim 1, characterized in that: The mass ratio of the hydrothermal charcoal, N,N'-methylene-bis(1-(3-vinylimidazole)) chloride and azobisisobutyronitrile in step (2) is 10-12:15-25:1.4-2.

5.

9. The use of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to claim 1, characterized in that: The solvent in step (2) is a mixed solvent of water and dimethyl sulfoxide, and the volume ratio of water to dimethyl sulfoxide is 1-2:1-2.

10. The use of the bisimidazolyl polyionic liquid functionalized hydrothermal carbon in the preparation of a pesticide sustained-release agent according to claim 1, characterized in that: The pesticide slow-release agent also includes Cl - The pesticide is 2,4-D sodium.

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