Soil improvement repairing agent and preparation method thereof

Abstract

The invention relates to the technical field of soil improvement, and discloses a soil improvement repairing agent and a preparation method thereof. The preparation method comprises the following steps: adding biochar, modified eugenol, modified benzothiazolyl pyridine, bacillus licheniformis and diatomite into a mixer, mixing and stirring, extruding and granulating in a granulator, and drying to obtain the soil improvement repairing agent. Eugenol can destroy a membrane structure and denature protein, so that a bacteriostatic effect is achieved, and a healthy soil microenvironment is provided for crops; the quaternary ammonium salt can destroy the membrane structure of pathogenic microorganisms, plays a role in killing the microorganisms, can improve the antibacterial effect of the remediation agent, and prevents and treats spread diseases of soil; nitrogen atoms and sulfur atoms in benzothiazolyl pyridine molecules can coordinate with free heavy metal ions in the soil, the heavy metal adsorption effect of the remediation agent is improved, the production value of the soil is gradually restored, meanwhile, boric acid capable of being absorbed by plants can be released through hydrolysis of pinacol ester, and the fertility of the soil is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil improvement, in particular to a soil improvement and repair agent and a preparation method thereof. BACKGROUND

[0002] With the rapid development of global population growth and industrialization and agricultural intensification, soil, as the basis of agricultural production and an important part of the ecological system, is facing an unprecedented degradation crisis. Farmland is polluted and degraded to varying degrees, with problems such as excessive heavy metals and decreased water retention. Soil improvement agents are important functional materials in the fields of agricultural production and ecological restoration, which can improve soil fertility and promote plant growth. However, the mainstream soil improvement agents on the current market have limited heavy metal passivation effect and weak synergistic effect among components. For example, the patent with publication number CN120208728A discloses a soil improvement agent, a preparation method and application thereof. The soil improvement agent provided by the invention has good compost quality, high compost efficiency and is friendly to the environment, but the soil bacteriostatic performance and heavy metal adsorption effect need to be improved. SUMMARY

[0003] (I) Technical problems solved In view of the deficiencies of the prior art, the present application provides a soil improvement and repair agent and a preparation method thereof. The soil improvement and repair agent prepared by the present application has good bacteriostatic performance and heavy metal adsorption effect.

[0004] (II) Technical solutions To achieve the above-mentioned purpose, the present application provides the following technical solutions: a soil improvement and repair agent, comprising the following components by weight: 40-50 parts by weight of biochar, 2-4 parts by weight of modified eugenol, 1-3 parts by weight of modified benzothiazolylpyridine, 1-1.5 parts by weight of bacillus licheniformis, and 3-5 parts by weight of diatomite.

[0005] Further, the preparation method of the modified eugenol is as follows: Step one: add eugenol and 1,2-ethanedithiol to dichloromethane solvent, stir uniformly, then add benzoin dimethyl ether photoinitiator, irradiate under a wavelength of 365nm for 22-26h, after the reaction is completed, separate by column chromatography, and vacuum dry at 30-50℃ for 20-25h to obtain eugenol-based bisphenol monomer; Step 2: Under nitrogen protection, add eugenol-based bisphenol monomer and epichlorohydrin to the reactor, stir and mix, then add benzyltriethylammonium chloride catalyst, magnetically stir at 90-100°C for 4-6 hours, then cool to 50-70°C, slowly add 30% by mass sodium hydroxide solution to the reaction system, continue the reaction for 4-6 hours, filter, wash, recrystallize, and vacuum dry at 25-35°C for 7-9 hours to obtain intermediate 1; Step 3: Add intermediate 1 and octadecyldimethyl tertiary amine to ethanol solvent, stir and react at 55-65° C. for 4-8 hours. After the reaction is completed, cool to room temperature, remove the solvent by rotary evaporation, filter, wash and dry to obtain modified eugenol.

[0006] Furthermore, in the step 1, the usage ratio of dichloromethane, eugenol, 1,2-ethanedithiol, and benzoin dimethyl ether is 50-60 mL: 4.93-4.97 g: 1.41-1.45 g: 0.06-0.07 g.

[0007] Furthermore, in the step 2, the usage ratio of eugenol-based bisphenol monomer, epichlorohydrin, benzyltriethylammonium chloride, and sodium hydroxide is 4.22-4.26 g: 2.78-2.82 g: 0.06-0.08 g: 2.5-2.6 g.

[0008] Furthermore, in the step 3, the usage ratio of ethanol, intermediate 1, and octadecyldimethyl tertiary amine is 30-40 mL: 3.58-3.62 g: 4.46-4.5 g.

[0009] Furthermore, the preparation method of the modified benzothiazolyl pyridine is: S1: adding o-aminothiophenol and 4-pyridinecarboxaldehyde to an ethanol solvent, stirring and mixing, then adding ammonium chloride, reacting at 50-65°C for 22-26 hours, and filtering after the reaction to obtain benzothiazolylpyridine; S2: Add benzothiazolyl pyridine and bromomethyl boric acid pinacol ester to acetonitrile solvent, stir evenly, react at 65-75° C. for 12-16 hours, filter, and wash to obtain modified benzothiazolyl pyridine.

[0010] Furthermore, the usage ratio of ethanol, o-aminothiophenol, 4-pyridinecarboxaldehyde, and ammonium chloride in S1 is 60-70 mL: 4.02-4.06 g: 3.44-3.48 g: 0.51-0.53 g.

[0011] Furthermore, the usage ratio of acetonitrile, benzothiazolylpyridine, and bromomethylboronic acid pinacol ester in S2 is 80-90 mL: 2.03-2.07 g: 2.22-2.26 g.

[0012] Further, the preparation method of the soil improvement repair agent is as follows: the biocarbon, modified eugenol, modified benzothiazole pyridine, bacillus licheniformis and diatomite are added into a mixer, mixed and stirred for 20-40 minutes, then extruded and granulated in a granulator, dried at 35-45 DEG C, and the soil improvement repair agent is obtained.

[0013] (Three) beneficial technical effects The application adds biocarbon, modified eugenol, modified benzothiazole pyridine, bacillus licheniformis and diatomite into a mixer, mixes and stirs, then extrudes and granulates in a granulator, and dries to obtain a soil improvement repair agent.

[0014] Eugenol can destroy the membrane structure, denature protein, and inhibit enzyme activity, so as to play a bacteriostatic effect and provide a healthy soil microenvironment for crops; the quaternary ammonium salt can destroy the membrane structure of pathogenic microorganisms, so that the cell contents are leaked, thereby playing a role of killing microorganisms, improving the bacteriostatic effect of the repair agent, and preventing and treating the spread of soil diseases; the nitrogen atom and the sulfur atom in the benzothiazole pyridine molecule can coordinate with the free heavy metal ions in the soil to form a stable, intramolecular ring chelate, improve the heavy metal adsorption effect of the repair agent, reduce the toxic pressure of microorganisms on the soil, and gradually restore the production value of the soil, and the subsequent reaction with bromomethyl boronic acid pinacol ester generates a quaternary ammonium salt, and the hydrolysis of pinacol ester releases boric acid that can be absorbed by plants, thereby improving the fertility of the soil. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the reaction synthesis formula of modified benzothiazole pyridine.

[0016] Figure 2 It is a soil effect picture of the application example improvement repair agent.

[0017] Figure 3 It is a comparison picture of the application example test field and the control field applying the improvement agent. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme in the embodiments of the application is described clearly and completely, obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.

[0019] In order to better understand the above technical scheme, the above technical scheme will be described in detail in combination with the drawings in the specification and specific embodiments.

[0020] The reagents used in the following specific embodiments are of analytical purity, and the like: Diatomaceous earth: density 2.15 g / m 3 . Example 1

[0021] (1) 4.93 g of eugenol, 1.41 g of 1,2-ethanedithiol, and 0.06 g of benzpinacol photoinitiator were added to 50 mL of dichloromethane solvent, stirred uniformly, and then irradiated at a wavelength of 365 nm for 22 h. After the reaction was completed, column chromatography was performed, and vacuum drying was performed at 30°C for 20 h to obtain an eugenol-based bisphenol monomer; (2) 4.22 g of the eugenol-based bisphenol monomer and 2.78 g of epichlorohydrin were added to a reactor, stirred and mixed, and then 0.06 g of benzyltriethylammonium chloride catalyst was added. Magnetic stirring was performed at 90°C for 4 h, and then the temperature was lowered to 50°C. 2.5 g of a 30% sodium hydroxide solution was slowly added dropwise to the reaction system, and the reaction was continued for 4 h. After the reaction was completed, filtration, washing, and recrystallization were performed, and vacuum drying was performed at 25°C for 7 h to obtain an intermediate 1; (3) 3.58 g of the intermediate 1 and 4.46 g of octadecyldimethyl tertiary amine were added to 30 mL of ethanol solvent, and stirring was performed at 55°C for 4 h. After the reaction was completed, the temperature was lowered to room temperature, the solvent was removed by rotary evaporation, and filtration, washing, and drying were performed to obtain a modified eugenol; (4) 4.02 g of o-aminothiophenol and 3.44 g of 4-pyridine carboxaldehyde were added to 60 mL of ethanol solvent, stirred and mixed, and then 0.51 g of ammonium chloride was added. The reaction was performed at 50°C for 22 h. After the reaction was completed, filtration was performed to obtain a benzothiazolylpyridine; (5) 2.03 g of the benzothiazolylpyridine and 2.22 g of bromomethyl pinacol borate were added to 80 mL of acetonitrile solvent, stirred uniformly, and then the reaction was performed at 65°C for 12 h. After the reaction was completed, filtration and washing were performed to obtain a modified benzothiazolylpyridine; (6) 40 parts by weight of biochar, 2 parts by weight of the modified eugenol, 1 part by weight of the modified benzothiazolylpyridine, 1 part by weight of Bacillus licheniformis, and 3 parts by weight of diatomaceous earth were added to a mixer, mixed and stirred for 20 min, and then extrusion granulation was performed in a granulator. Drying was performed at 35°C to obtain a soil improvement and remediation agent. Example 2

[0022] (1) 4.97 g of eugenol, 1.45 g of 1,2-ethanedithiol, and 0.07 g of benzpinacol photoinitiator were added to 60 mL of dichloromethane solvent, stirred uniformly, and then irradiated at a wavelength of 365 nm for 26 h. After the reaction was completed, column chromatography was performed, and vacuum drying was performed at 50°C for 25 h to obtain an eugenol-based bisphenol monomer; (2) Under the protection of nitrogen gas, 4.26 g of eugenol-based bisphenol monomer, 2.82 g of epichlorohydrin, and 0.08 g of benzyl triethyl ammonium chloride catalyst were added to a reactor and stirred and mixed, and then stirred magnetically at 100°C for 6 h, and then cooled to 70°C, and 2.6 g of a 30% sodium hydroxide solution was slowly added dropwise to the reaction system, and the reaction was continued for 6 h, after the reaction was completed, filtration, washing, recrystallization, and vacuum drying at 35°C for 9 h were performed to obtain intermediate 1; (3) 3.62 g of intermediate 1, 4.5 g of octadecyl dimethyl tertiary amine, and 65°C were added to 40 mL of an ethanol solvent, and stirred and reacted for 8 h, after the reaction was completed, the temperature was cooled to room temperature, the solvent was removed by rotary evaporation, and filtration, washing, and drying were performed to obtain modified eugenol; (4) 4.06 g of o-aminothiophenol, 3.48 g of 4-pyridine carboxaldehyde, and 0.53 g of ammonium chloride were added to 70 mL of an ethanol solvent, stirred and mixed, and then reacted at 65°C for 26 h, after the reaction was completed, filtration was performed to obtain benzothiazolyl pyridine; (5) 2.07 g of benzothiazolyl pyridine, 2.26 g of bromomethyl pinacol borate, and 75°C were added to 90 mL of an acetonitrile solvent, stirred and mixed, and then reacted at 75°C for 16 h, after the reaction was completed, filtration and washing were performed to obtain modified benzothiazolyl pyridine; (6) 50 parts by weight of biochar, 4 parts by weight of modified eugenol, 3 parts by weight of modified benzothiazolyl pyridine, 1.5 parts by weight of bacillus licheniformis, and 5 parts by weight of diatomite were added to a mixer, stirred and mixed for 40 min, and then extrusion granulation was performed in a granulator, and drying was performed at 45°C to obtain a soil improvement and remediation agent. Example 3

[0023] (1) 4.95 g of eugenol, 1.43 g of 1,2-ethanedithiol, and 0.06 g of benzoin dimethyl ether photoinitiator were added to 55 mL of a dichloromethane solvent, stirred and mixed, and then irradiated at a wavelength of 365 nm for 24 h, after the reaction was completed, column chromatography separation was performed, and vacuum drying was performed at 40°C for 23 h to obtain eugenol-based bisphenol monomer; (2) Under the protection of nitrogen gas, 4.24 g of eugenol-based bisphenol monomer, 2.8 g of epichlorohydrin, and 0.07 g of benzyl triethyl ammonium chloride catalyst were added to a reactor and stirred and mixed, and then stirred magnetically at 95°C for 5 h, and then cooled to 60°C, and 2.55 g of a 30% sodium hydroxide solution was slowly added dropwise to the reaction system, and the reaction was continued for 5 h, after the reaction was completed, filtration, washing, recrystallization, and vacuum drying at 30°C for 8 h were performed to obtain intermediate 1; (3) 3.6 g of intermediate 1, 4.48 g of octadecyldimethyl tertiary amine were added to 35 mL of ethanol solvent, stirred at 60°C for 6 h, after the reaction was completed, cooled to room temperature, rotary evaporation to remove the solvent, filtration, washing and drying to obtain modified eugenol; (4) 4.04 g of o-aminothiophenol, 3.46 g of 4-pyridine carboxaldehyde were added to 65 mL of ethanol solvent, stirred and mixed, then 0.52 g of ammonium chloride was added, reacted at 58°C for 24 h, after the reaction was completed, filtered to obtain benzothiazolylpyridine; (5) 2.05 g of benzothiazolylpyridine, 2.24 g of bromomethyl boronic acid pinacol ester were added to 85 mL of acetonitrile solvent, stirred uniformly, reacted at 70°C for 14 h, after the reaction was completed, filtered, washed to obtain modified benzothiazolylpyridine; (6) 45 parts by weight of biochar, 3 parts by weight of modified eugenol, 2 parts by weight of modified benzothiazolylpyridine, 1.2 parts by weight of bacillus licheniformis, 4 parts by weight of diatomite were added to a mixer, mixed and stirred for 30 min, then extruded and granulated in a granulator, dried at 40°C to obtain a soil improvement and remediation agent. Example 4

[0024] (1) 4.94 g of eugenol, 1.42 g of 1,2-ethanedithiol were added to 52 mL of dichloromethane solvent, stirred uniformly, then 0.06 g of benzoin dimethyl ether photoinitiator was added, irradiated at a wavelength of 365 nm for 23 h, after the reaction was completed, column chromatography separation, vacuum drying at 35°C for 22 h to obtain eugenol-based bisphenol monomer; (2) Under the protection of nitrogen gas, 4.23 g of eugenol-based bisphenol monomer, 2.79 g of epichlorohydrin were added to a reactor, stirred and mixed, then 0.06 g of benzyl triethyl ammonium chloride catalyst was added, stirred magnetically at 92°C for 4 h, then cooled to 55°C, 2.52 g of 30% mass fraction sodium hydroxide solution was slowly added dropwise to the reaction system, continued to react for 4 h, after the reaction was completed, filtered, washed, recrystallized, vacuum dried at 28°C for 7 h to obtain intermediate 1; (3) 3.59 g of intermediate 1, 4.47 g of octadecyldimethyl tertiary amine were added to 32 mL of ethanol solvent, stirred at 58°C for 5 h, after the reaction was completed, cooled to room temperature, rotary evaporation to remove the solvent, filtration, washing and drying to obtain modified eugenol; (4) 4.03 g of o-aminothiophenol, 3.45 g of 4-pyridine carboxaldehyde were added to 62 mL of ethanol solvent, stirred and mixed, then 0.51 g of ammonium chloride was added, reacted at 55°C for 23 h, after the reaction was completed, filtered to obtain benzothiazolylpyridine; (5) 2.04 g of benzothiazolylpyridine, 2.23 g of bromomethyl pinacol boronate were added into 82 mL of acetonitrile solvent, stirred uniformly, and reacted at 68°C for 13 h. After the reaction was completed, filtration, washing, and modification of benzothiazolylpyridine were performed; (6) 42 parts by weight of biochar, 2 parts by weight of modified eugenol, 2 parts by weight of modified benzothiazolylpyridine, 1 part by weight of bacillus licheniformis, and 4 parts by weight of diatomite were added into a mixer, mixed and stirred for 25 min, then extrusion granulation was performed in a granulator, and drying was performed at 38°C to obtain a soil improvement and remediation agent. Example 5

[0025] (1) 4.96 g of eugenol, 1.44 g of 1,2-ethanedithiol were added into 58 mL of dichloromethane solvent, stirred uniformly, and then 0.07 g of benzoin dimethyl ether photoinitiator was added. Irradiation was performed at a wavelength of 365 nm for 25 h. After the reaction was completed, column chromatography separation was performed, and vacuum drying was performed at 45°C for 24 h to obtain eugenol-based bisphenol monomer; (2) Under the protection of nitrogen gas, 4.25 g of eugenol-based bisphenol monomer, 2.81 g of epichlorohydrin were added into a reactor, stirred and mixed, and then 0.08 g of benzyltriethylammonium chloride catalyst was added. Magnetic stirring was performed at 98°C for 6 h, and then the temperature was lowered to 65°C. 2.58 g of 30% sodium hydroxide solution was slowly added dropwise into the reaction system, and the reaction was continued for 6 h. After the reaction was completed, filtration, washing, recrystallization, and vacuum drying were performed at 32°C for 9 h to obtain intermediate 1; (3) 3.61 g of intermediate 1, 4.49 g of octadecyldimethyl tertiary amine were added into 38 mL of ethanol solvent, and stirring reaction was performed at 62°C for 7 h. After the reaction was completed, the temperature was cooled to room temperature, the solvent was removed by rotary evaporation, and filtration, washing, and drying were performed to obtain modified eugenol; (4) 4.05 g of o-aminothiophenol, 3.47 g of 4-pyridine formaldehyde were added into 68 mL of ethanol solvent, stirred and mixed, and then 0.53 g of ammonium chloride was added. Reaction was performed at 62°C for 24 h. After the reaction was completed, filtration was performed to obtain benzothiazolylpyridine; (5) 2.06 g of benzothiazolylpyridine, 2.25 g of bromomethyl pinacol boronate were added into 88 mL of acetonitrile solvent, stirred uniformly, and reacted at 72°C for 15 h. After the reaction was completed, filtration, washing, and modification of benzothiazolylpyridine were performed; (6) 48 parts by weight of biochar, 3 parts by weight of modified eugenol, 3 parts by weight of modified benzothiazolylpyridine, 1.5 parts by weight of bacillus licheniformis, and 5 parts by weight of diatomite were added into a mixer, mixed and stirred for 35 min, then extrusion granulation was performed in a granulator, and drying was performed at 42°C to obtain a soil improvement and remediation agent.

[0026] Comparative Example 1 This comparative example is different from Example 5 in that the intermediate 1 is used instead of the modified eugenol.

[0027] Comparative Example 2 This comparative example is different from Example 5 in that the benzothiazolylpyridine is used instead of the modified benzothiazolylpyridine.

[0028] Performance test: The soil improvement and remediation agents prepared in Examples 1-5 and Comparative Examples 1-2 were subjected to performance tests.

[0029] (1) Bacteriostatic performance test: 8 treatment groups were set up, 7 treatment groups took 2.0 kg of sterilized soil, and 40 g of soil improvement and remediation agents in Examples 1-5 and Comparative Examples 1-2 were added to the sterilized soil, sterile water was added to make the soil moisture content reach 60%, 20 mL of bacterial suspension (10 8 CFU / mL) containing Pseudomonas solanacearum, Rhizoctonia solani, Fusarium oxysporum, and Sclerotinia sclerotiorum was uniformly sprayed into the soil, and incubated at 25°C in the dark for 14 days; the remaining one group of control group was not added with soil improvement agent, and the others were the same as the treatment group. The bacteriostatic rate was calculated, and the bacteriostatic rate = (control group bacteria number - treatment group bacteria number) / control group bacteria number x 100%. The experimental soil was taken from Shuofengyuan strawberry picking garden in Changfeng County. The test results are shown in Table 1.

[0030] Table 1: Bacteriostatic performance test

[0031] As can be seen from Table 1, the soil improvement and remediation agents prepared in Examples 1-5 of the present application have good bacteriostatic performance.

[0032] (2) Heavy metal adsorption test: the experimental soil was added to deionized water to prepare a mixture with a solid content of 100 g / L at 1200 mL, 3 mL of 1 mol / L hydrochloric acid was added to the mixture, stirred for 1 h, and the heavy metal ion content was tested as C1. The mixture was evenly divided into 7 experimental groups, 1 g of soil improvement and remediation agents prepared in Examples 1-5 and Comparative Examples 1-2 of the present application was added to each group, stirred evenly, and then left to stand for 5 days. The supernatant was taken and the heavy metal ion content was tested as C2. The adsorption rate was calculated according to the formula: [(C1-C2) / C1]x100%. The experimental soil was taken from Shuofengyuan strawberry picking garden in Changfeng County. The test results are shown in Table 2.

[0033] Table 2: Heavy metal adsorption test

[0034] As can be seen from Table 2, the soil improvement and remediation agents prepared in Examples 1-5 of the present application have good heavy metal adsorption effect.

[0035] As Figure 2 shown, the improved repair agent is applied to the soil for observation, and the soil improvement effect is significant, and the straw decomposition rate reaches 95%. The control field (without adding soil improvement agent): the straw decomposition degree is poor, and the soil improvement effect is poor.

[0036] As Figure 3 shown, the improved repair agent is applied to the soil for observation, and the soil improvement effect is significant, and the straw decomposition rate reaches 95%. The control field (without adding soil improvement agent): the straw decomposition degree is poor, and the soil improvement effect is poor. Figure 3 The left side of the middle mud bar is the improved experimental field of Xiehe, and the right side is the control field. After applying the soil improvement agent, it is found that the soil color on both sides is different on July 8, which is the intuitive performance of the difference in soil salinity caused by the difference in microbial quantity. The experimental field returns to the soil color, and the control field is red. The improvement effect is good.

[0037] Improvement data: After testing the experimental field and the control field, the salinity EC value is 0.85 for the experimental field and 4.3 for the control field; the pH value is 6.1 for the experimental field and 4.65 for the control field.

[0038] It should be noted that in this paper, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a…" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0039] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

[0040] Those skilled in the art should understand that the above only describes some specific embodiments of the present application, not all embodiments. It should be noted that many modifications and improvements can be made by those skilled in the art, and all modifications and improvements that do not exceed the scope of the claims should be regarded as the protection scope of the present application.

Claims

1. A soil improvement and repair agent, characterized in that: The invention comprises the following components by weight: 40-50 parts by weight of biochar, 2-4 parts by weight of modified eugenol, 1-3 parts by weight of modified benzothiazolyl pyridine, 1-1.5 parts by weight of Bacillus licheniformis, and 3-5 parts by weight of diatomaceous earth.

2. The soil improving and repairing agent according to claim 1, characterized in that The preparation method of the modified eugenol is: Step 1: Add eugenol and 1,2-ethanedithiol to dichloromethane solvent, stir evenly, then add benzoin dimethyl ether photoinitiator, irradiate at a wavelength of 365nm for 22-26h. After the reaction is completed, separate by column chromatography and vacuum dry at 30-50°C for 20-25h to obtain eugenol-based bisphenol monomer; Step 2: Under nitrogen protection, add eugenol-based bisphenol monomer and epichlorohydrin to the reactor, stir and mix, then add benzyltriethylammonium chloride catalyst, magnetically stir at 90-100°C for 4-6 hours, then cool to 50-70°C, slowly add 30% by mass sodium hydroxide solution to the reaction system, continue the reaction for 4-6 hours, filter, wash, recrystallize, and vacuum dry at 25-35°C for 7-9 hours to obtain intermediate 1; Step 3: Add intermediate 1 and octadecyldimethyl tertiary amine to ethanol solvent, stir and react at 55-65° C. for 4-8 hours. After the reaction is completed, cool to room temperature, remove the solvent by rotary evaporation, filter, wash and dry to obtain modified eugenol.

3. The soil improving and repairing agent according to claim 2, characterized in that In the step 1, the usage ratio of dichloromethane, eugenol, 1,2-ethanedithiol, and benzoin dimethyl ether is 50-60 mL: 4.93-4.97 g: 1.41-1.45 g: 0.06-0.07 g.

4. The soil improving and repairing agent according to claim 2, characterized in that In the step 2, the usage ratio of eugenol-based bisphenol monomer, epichlorohydrin, benzyltriethylammonium chloride, and sodium hydroxide is 4.22-4.26 g: 2.78-2.82 g: 0.06-0.08 g: 2.5-2.6 g.

5. The soil improving and repairing agent according to claim 2, characterized in that In the step 3, the usage ratio of ethanol, intermediate 1, and octadecyldimethyl tertiary amine is 30-40 mL: 3.58-3.62 g: 4.46-4.5 g.

6. The soil improving and repairing agent according to claim 1, characterized in that The preparation method of the modified benzothiazolyl pyridine is: S1: adding o-aminothiophenol and 4-pyridinecarboxaldehyde to an ethanol solvent, stirring and mixing, then adding ammonium chloride, reacting at 50-65°C for 22-26 hours, and filtering after the reaction to obtain benzothiazolylpyridine; S2: Add benzothiazolyl pyridine and bromomethyl boric acid pinacol ester to acetonitrile solvent, stir evenly, react at 65-75° C. for 12-16 hours, filter, and wash to obtain modified benzothiazolyl pyridine.

7. The soil improving and repairing agent according to claim 6, characterized in that The usage ratio of ethanol, o-aminothiophenol, 4-pyridinecarboxaldehyde, and ammonium chloride in S1 is 60-70 mL: 4.02-4.06 g: 3.44-3.48 g: 0.51-0.53 g.

8. The soil improving and repairing agent according to claim 6, characterized in that The usage ratio of acetonitrile, benzothiazolylpyridine, and bromomethylboronic acid pinacol ester in S2 is 80-90 mL: 2.03-2.07 g: 2.22-2.26 g.

9. A method for preparing the soil improving and repairing agent according to any one of claims 1 to 8, characterized in that: The preparation method of the soil improvement and repair agent comprises the following steps: adding biochar, modified eugenol, modified benzothiazolylpyridine, Bacillus licheniformis and diatomaceous earth into a mixer, mixing and stirring for 20-40 minutes, then extruding and granulating in a granulator, and drying at 35-45° C. to obtain the soil improvement and repair agent.

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