Agricultural seed coating auxiliary agent and preparation method and application thereof

Abstract

The invention discloses an agricultural seed coating auxiliary agent as well as a preparation method and application thereof, and belongs to the technical field of auxiliary agents for agricultural production. The preparation method is used for solving the technical problems that in the prior art, an agricultural seed coating auxiliary agent is single in function, and the system stability needs to be further improved, and comprises the steps that poly (3, 4-dihydroxyphenethyl acrylate), butyl acrylate and stannous octoate are mixed, heated, subjected to a reaction and purified after the reaction is finished, and a segmented copolymer is obtained; mixing the block copolymer, PEGMA, a photoinitiator and tetrahydrofuran, carrying out room temperature reaction under ultraviolet light, and carrying out rotary evaporation after the reaction is ended, so as to obtain a PEGMA grafted block copolymer; mixing the PEGMA grafted block copolymer, chitosan oligosaccharide, a water-soluble organic matter, a water-retaining agent and water, and homogenizing to obtain an auxiliary agent of the agricultural seed coating agent; the prepared auxiliary agent for the agricultural seed coating agent has good film-forming performance and adhesion performance; an agricultural auxiliary agent obtained by mixing the corn seed dressing agent with pesticide raw materials and other components is used for seed dressing of corn and wheat, and the emergence rate can be increased.

Description

Technical Field

[0001] This invention relates to the field of agricultural production adjuvants, specifically to an agricultural seed coating adjuvant, its preparation method, and its application. Background Technology

[0002] Seed coating agents are mainly made from pesticide technicals, micronutrients or plant growth regulators, and adjuvants such as film-forming agents, dispersants, and antifreeze agents. Seed coating agents use seeds as carriers, adhering to the seed surface with the help of film-forming agents, quickly solidifying to form a uniform and non-detachable film. After sowing, the seed coating agent forms a protective barrier on the seed's outer surface. The active ingredients in the seed coating agent are gradually absorbed by the plant's roots as the seed germinates, emerges, and grows, and are transported to all parts of the seedling, effectively preventing diseases and pests caused by soil pathogens and pests. Seed coating agents are often used for crop seeds requiring long-term protection or in planting environments with numerous soil-borne diseases and pests, where the stability of the film is crucial to ensure effectiveness. Currently, seed coating agent adjuvants often have limited functions; for example, film-forming agents only form the film, and adhesives only adhere to the seed, leading to complex formulations and a tendency for system stability to decline due to interactions between components in practical applications. Summary of the Invention

[0003] The purpose of this invention is to provide an agricultural seed coating adjuvant, its preparation method, and its application, in order to solve the technical problems of existing agricultural seed coating adjuvants having limited functions and requiring further improvement in system stability.

[0004] To achieve the above objectives, the present invention provides a method for preparing an agricultural seed coating adjuvant, comprising the following steps: Step (1) Under nitrogen protection, 3,4-dihydroxyphenylethyl acrylate, benzyl dithiobenzoate and AIBN were added to tetrahydrofuran and heated to react until the reaction was complete; a mixed solution was added, the mixture was allowed to stand, filtered and washed to obtain poly(3,4-dihydroxyphenylethyl acrylate). Step (2) Mix poly(3,4-dihydroxyphenylethyl acrylate), butyl acrylate and stannous octoate, heat, react, and after the reaction is complete, purify to obtain block copolymer; Step (3) The block copolymer, PEGMA, photoinitiator and tetrahydrofuran are mixed and reacted at room temperature under ultraviolet light. After the reaction is completed, the mixture is rotary evaporated to obtain PEGMA grafted block copolymer. Step (4) Mix PEGMA grafted block copolymer, chitosan oligosaccharide, water-soluble organic matter, water-retaining agent and water, and homogenize to obtain agricultural seed coating adjuvant.

[0005] Preferably, in the step (1), the mass ratio of 3,4-dihydroxyphenethyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran is 100:(5-7):(1-1.4):(400-600); the reaction condition is: 45-55℃ for 2-3h.

[0006] Preferably, in the step (1), the mixed solution is a mixed solution obtained by mixing methanol and n-hexane in a volume ratio of 1:3.

[0007] Preferably, in the step (2), the mass ratio of poly-3,4-dihydroxyphenethyl acrylate, butyl acrylate and stannous octoate is 100:(280-300):(0.1-0.2); the reaction condition is: 75-85℃ for 2-4h.

[0008] Preferably, in the step (2), the purification step is specifically: adding 5 times the volume of ethyl acetate to the reaction system, separating, taking the organic phase, slowly pouring the organic phase solution into 10 times the volume of methanol, stirring to precipitate, suction filtration, washing with methanol, and drying at-0.08MPa, 40-45℃ for 2-3h to obtain the block copolymer.

[0009] Preferably, in the step (3), the mass ratio of block copolymer, PEGMA, photoinitiator and tetrahydrofuran is (600-800):(300-400):(4-8):(1800-2600); the ultraviolet light wavelength is 254nm; the photoinitiator is benzoin ethyl ether; and the reaction time is 2-3h.

[0010] Preferably, in the step (3), the rotary evaporation condition is specifically: -0.08MPa, 40-50℃ for 40-60min.

[0011] Preferably, in the step (4), the mass ratio of PEGMA grafted block copolymer, chitooligosaccharide, water-soluble organic matter, water-retaining agent and water is (10-18):(4-6):(3-5):(1-3):(80-120).

[0012] Preferably, in the step (4), the water-soluble organic matter is one or more of fulvic acid, fulvic acid salt and humic acid salt.

[0013] Preferably, in the step (4), the water-retaining agent is γ-polyglutamic acid.

[0014] Preferably, an agricultural seed coating agent aid is prepared by the preparation method of the agricultural seed coating agent aid.

[0015] Preferably, an agricultural seed coating agent comprises the agricultural seed coating agent aid.

[0016] Preferably, the application of the agricultural seed coating agent in improving the emergence rate of corn and wheat seeds.

[0017] Preferably, the use steps of the agricultural seed coating agent additive are as follows: the agricultural seed coating agent additive is mixed with the insecticide and water to prepare a solution; the seeds are coated with the solution, and then dried. The insecticide is imidacloprid.

[0018] The mass ratio of the agricultural seed coating agent additive, the insecticide and water is (5-10):(1-3):(87-94).

[0019] Compared with the prior art, the application has the following beneficial effects: 1. The poly-3,4-dihydroxyphenethyl acrylate used in the application contains o-diphenol groups, has a dopa structure, can form hydrogen bonds with the surface of the seeds, has strong adhesion in a wet environment, and significantly improves the adhesion strength and stability. The poly-3,4-dihydroxyphenethyl acrylate, butyl acrylate and stannous octoate are mixed and heated to react to obtain a block copolymer. The polybutyl acrylate is embedded in the poly-3,4-dihydroxyphenethyl acrylate, which is beneficial to the film flexibility, compactness and crack resistance, and effectively improves the stability of the seed coating film. The PEG segment contained in PEGMA locks water through hydrogen bonds on one hand, solves the problem of rapid water loss caused by the insufficient hydrophilicity of the film in the prior art, and provides an "anchoring site" for the subsequent functional additives chitinous oligosaccharide and gamma-polyglutamic acid on the other hand. The chitinous oligosaccharide and gamma-polyglutamic acid are anchored through hydrogen bonds, which not only enhances the overall compactness of the film, but also reduces the probability of the functional components falling off with the film. At the same time, the chitinous oligosaccharide and gamma-polyglutamic acid can adhere to the surface of the seeds through hydrogen bond action.

[0020] 2. In the application, the chitinous oligosaccharide has the functions of promoting plant growth and antibacterial inhibition; the fulvic acid improves the nutrient supply of the seeds and promotes the germination of the crop seeds; the gamma-polyglutamic acid has good water retention and can release water and nutrients, thereby improving the stability of the germination environment; in combination with the PEGMA graft block copolymer, the seed germination rate is improved. The agricultural seed coating agent additive prepared in the application has good performance and can be used for preparing a seed coating agent, avoiding the addition of multiple additives and causing the instability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The preparation process flow chart of the agricultural seed coating agent additive in the application is shown in the figure. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0023] Embodiment 1 The present embodiment provides a preparation method of an agricultural seed coating agent adjuvant, comprising the following steps: Step (1) under nitrogen protection, 3,4-dihydroxyphenethyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran are mixed in a mass ratio of 100:5:1:400, reacted at 45℃ for 3h, after the reaction is completed, a mixed solution obtained by mixing methanol and n-hexane in a volume ratio of 1:3 is added, and the mixture is left to stand at room temperature, filtered, and the precipitate is washed with methanol for 3 times to obtain poly-3,4-dihydroxyphenethyl acrylate; Step (2) poly-3,4-dihydroxyphenethyl acrylate, butyl acrylate and stannous octoate are mixed in a mass ratio of 100:280:0.1, heated at 75℃ for 4h, after the reaction is completed, 5 times the volume of ethyl acetate is added to the reaction system, and the mixture is separated, the organic phase is taken, and the organic phase solution is slowly poured into 10 times the volume of methanol, stirred to precipitate, filtered, and the precipitate is washed with methanol for 3 times, and dried at-0.08MPa and 40℃ for 3h to obtain a block copolymer; Step (3) the block copolymer, PEGMA, benzoin ether and tetrahydrofuran are mixed in a mass ratio of 600:300:4:1800, reacted at room temperature under ultraviolet light with a wavelength of 254nm for 3h, after the reaction is completed, rotary evaporation is performed at-0.08MPa and 40℃ for 60min to obtain a PEGMA grafted block copolymer; Step (4) the PEGMA grafted block copolymer, chitooligosaccharide, fulvic acid, gamma-polyglutamic acid and water are mixed in a mass ratio of 10:4:3:1:80, homogenized to obtain an agricultural seed coating agent adjuvant.

[0024] Embodiment 2 The present embodiment provides a preparation method of an agricultural seed coating agent adjuvant, comprising the following steps: Step (1) under nitrogen protection, 3,4-dihydroxyphenethyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran are mixed in a mass ratio of 100:5.5:1.1:450, reacted at 47℃ for 2.8h, after the reaction is completed, a mixed solution obtained by mixing methanol and n-hexane in a volume ratio of 1:3 is added, and the mixture is left to stand at room temperature, filtered, and the precipitate is washed with methanol for 3 times to obtain poly-3,4-dihydroxyphenethyl acrylate; Step (2) poly 3, 4-dihydroxyphenyl acrylate, butyl acrylate and stannous octoate were mixed in a mass ratio of 100:285:0.1, heated at 77℃ for 3.5h, after the reaction was completed, 5 times the volume of ethyl acetate was added to the reaction system, liquid-liquid separation was carried out, the organic phase was taken, the organic phase solution was slowly poured into 10 times the volume of methanol, the precipitate was stirred and separated, vacuum filtration was carried out, the precipitate was washed with methanol for 3 times, and the precipitate was dried at-0.08MPa and 41℃ for 2.8h to obtain a block copolymer; Step (3) the block copolymer, PEGMA, benzoin ether and tetrahydrofuran were mixed in a mass ratio of 650:325:5:2000, reacted at room temperature under ultraviolet light with a wavelength of 254nm for 2.8h, after the reaction was completed, rotary evaporation was carried out at-0.08MPa and 42℃ for 55min to obtain a PEGMA grafted block copolymer; Step (4) the PEGMA grafted block copolymer, chitooligosaccharide, fulvic acid, gamma-polyglutamic acid and water were mixed in a mass ratio of 12:4.5:3.5:1.5:90, and homogenized to obtain an agricultural seed coating agent adjuvant.

[0025] Example 3 The embodiment provides a preparation method of an agricultural seed coating agent adjuvant, which comprises the following steps: Step (1) 3, 4-dihydroxyphenyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran were mixed in a mass ratio of 100:6:1.2:500 under nitrogen protection, reacted at 50℃ for 2.5h, after the reaction was completed, a mixed solution obtained by mixing methanol and n-hexane in a volume ratio of 1:3 was added, and the mixture was placed at room temperature, vacuum filtration was carried out, and the precipitate was washed with methanol for 3 times to obtain poly 3, 4-dihydroxyphenyl acrylate; Step (2) poly 3, 4-dihydroxyphenyl acrylate, butyl acrylate and stannous octoate were mixed in a mass ratio of 100:290:0.15, heated at 80℃ for 3h, after the reaction was completed, 5 times the volume of ethyl acetate was added to the reaction system, liquid-liquid separation was carried out, the organic phase was taken, the organic phase solution was slowly poured into 10 times the volume of methanol, the precipitate was stirred and separated, vacuum filtration was carried out, the precipitate was washed with methanol for 3 times, and the precipitate was dried at-0.08MPa and 43℃ for 2.5h to obtain a block copolymer; Step (3) the block copolymer, PEGMA, benzoin ether and tetrahydrofuran were mixed in a mass ratio of 700:350:6:2200, reacted at room temperature under ultraviolet light with a wavelength of 254nm for 2.5h, after the reaction was completed, rotary evaporation was carried out at-0.08MPa and 45℃ for 50min to obtain a PEGMA grafted block copolymer; Step (4) the PEGMA grafted block copolymer, chitooligosaccharide, fulvic acid, gamma-polyglutamic acid and water were mixed in a mass ratio of 14:5:4:2:100, and homogenized to obtain an agricultural seed coating agent adjuvant.

[0026] Example 4 The embodiment provides a preparation method of an agricultural seed coating agent auxiliary agent, and comprises the following steps: Step (1) under the protection of nitrogen, 3, 4-dihydroxyphenethyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran are mixed in a mass ratio of 100:6.5:1.3:550, and then reacted at a temperature of 53 DEG C for 2.2h; after the reaction is completed, a mixed solution obtained by mixing methanol and n-hexane in a volume ratio of 1:3 is added, and then the solution is left to stand at room temperature; the solution is extracted by suction filtration, and the precipitate is washed with methanol for 3 times to obtain poly-3, 4-dihydroxyphenethyl acrylate; Step (2) poly-3, 4-dihydroxyphenethyl acrylate, butyl acrylate and stannous octoate are mixed in a mass ratio of 100:295:0.2, and then heated and reacted at a temperature of 82 DEG C for 2.5h; after the reaction is completed, 5 times the volume of ethyl acetate is added to the reaction system to perform liquid separation; the organic phase solution is slowly poured into 10 times the volume of methanol, and then stirred to precipitate; the precipitate is extracted by suction filtration, and the precipitate is washed with methanol for 3 times; and the precipitate is dried at-0.08MPa and 44 DEG C for 2.3h to obtain a block copolymer; Step (3) the block copolymer, PEGMA, benzoin ether and tetrahydrofuran are mixed in a mass ratio of 750:375:7:2400, and then reacted at room temperature under ultraviolet light with a wavelength of 254nm for 2.2h; after the reaction is completed, the solution is rotary evaporated at-0.08MPa and 47 DEG C for 45min to obtain a PEGMA grafted block copolymer; Step (4) the PEGMA grafted block copolymer, chitinous oligosaccharide, fulvic acid, gamma-polyglutamic acid and water are mixed in a mass ratio of 16:5.5:4.5:2.5:110, and then homogenized to obtain an agricultural seed coating agent auxiliary agent.

[0027] Example 5 The embodiment provides a preparation method of an agricultural seed coating agent auxiliary agent, and comprises the following steps: Step (1) under the protection of nitrogen, 3, 4-dihydroxyphenethyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran are mixed in a mass ratio of 100:7:1.4:600, and then reacted at a temperature of 55 DEG C for 2h; after the reaction is completed, a mixed solution obtained by mixing methanol and n-hexane in a volume ratio of 1:3 is added, and then the solution is left to stand at room temperature; the solution is extracted by suction filtration, and the precipitate is washed with methanol for 3 times to obtain poly-3, 4-dihydroxyphenethyl acrylate; Step (2) poly 3, 4-dihydroxyphenyl acrylate, butyl acrylate and stannous octoate were mixed in a mass ratio of 100:300:0.2, heated at 85°C for 2h, after the reaction was completed, 5 times the volume of ethyl acetate was added to the reaction system, liquid-liquid separation was carried out, the organic phase was taken, the organic phase solution was slowly poured into 10 times the volume of methanol, the precipitate was stirred and separated, the precipitate was washed with methanol for 3 times, and the precipitate was dried at-0.08MPa and 45°C for 2h to obtain a block copolymer; Step (3) the block copolymer, PEGMA, benzoin ether and tetrahydrofuran were mixed in a mass ratio of 800:400:8:2600, and reacted under ultraviolet light with a wavelength of 254nm at room temperature for 2h, after the reaction was completed, rotary evaporation was carried out at-0.08MPa and 50°C for 40min to obtain a PEGMA grafted block copolymer; Step (4) the PEGMA grafted block copolymer, chitooligosaccharide, fulvic acid, gamma-polyglutamic acid and water were mixed in a mass ratio of 18:6:5:3:120, and homogenized to obtain an agricultural seed coating agent.

[0028] Comparative Example 1 The present comparative example provides a preparation method of an agricultural seed coating agent, comprising the following steps: Step (1) 3, 4-dihydroxyphenyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran were mixed in a mass ratio of 100:5:1:400 under nitrogen protection, and reacted at 45°C for 3h, after the reaction was completed, a mixed solution of methanol and n-hexane in a volume ratio of 1:3 was added, and the mixture was placed at room temperature, filtered, and the precipitate was washed with methanol for 3 times to obtain poly 3, 4-dihydroxyphenyl acrylate; Step (2) poly 3, 4-dihydroxyphenyl acrylate, butyl acrylate and stannous octoate were mixed in a mass ratio of 100:280:0.1, heated at 75°C for 4h, after the reaction was completed, 5 times the volume of ethyl acetate was added to the reaction system, liquid-liquid separation was carried out, the organic phase was taken, the organic phase solution was slowly poured into 10 times the volume of methanol, the precipitate was stirred and separated, the precipitate was washed with methanol for 3 times, and the precipitate was dried at-0.08MPa and 40°C for 3h to obtain a block copolymer; Step (3) the block copolymer, chitooligosaccharide, fulvic acid, gamma-polyglutamic acid and water were mixed in a mass ratio of 10:4:3:1:80, and homogenized to obtain an agricultural seed coating agent.

[0029] Comparative Example 2 The present comparative example provides a preparation method of an agricultural seed coating agent, comprising the following steps: Step (1) under nitrogen protection, 3,4-dihydroxyphenethyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran were mixed in a mass ratio of 100:5:1:400, reacted at 45℃ for 3h, after the reaction was completed, the mixed solution obtained by mixing methanol and n-hexane in a volume ratio of 1:3 was added, and it was placed at room temperature, then it was suction filtered, the precipitate was washed with methanol for 3 times, and poly 3,4-dihydroxyphenethyl acrylate was obtained; Step (2) poly 3,4-dihydroxyphenethyl acrylate, chitinous oligosaccharide, fulvic acid, γ-polyglutamic acid and water were mixed in a mass ratio of 10:4:3:1:80, and homogenized to obtain an agricultural seed coating agent.

[0030] Comparative Example 3 The present comparative example provides a preparation method of an agricultural seed coating agent, comprising the following steps: Step (1) under nitrogen protection, 3,4-dihydroxyphenethyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran were mixed in a mass ratio of 100:5:1:400, reacted at 45℃ for 3h, after the reaction was completed, the mixed solution obtained by mixing methanol and n-hexane in a volume ratio of 1:3 was added, and it was placed at room temperature, then it was suction filtered, the precipitate was washed with methanol for 3 times, and poly 3,4-dihydroxyphenethyl acrylate was obtained; Step (2) poly 3,4-dihydroxyphenethyl acrylate, fulvic acid, γ-polyglutamic acid and water were mixed in a mass ratio of 10:3:1:84, and homogenized to obtain an agricultural seed coating agent.

[0031] The agricultural seed coating agents in Comparative Examples 1-5 and Comparative Examples 1-3 were tested, and the test results are shown as follows: (1) Film forming time test: evenly coated corn seeds were poured on a clean cowhide paper and dried, a stopwatch was started to count, the surface change was observed, and the film forming time was calculated when the seeds were not adhered to each other, and the specific test results are shown in Table 1; (2) Film forming and falling off rate determination: 200g of coated corn seeds were placed in a constant temperature oven at 35℃ for 30min to solidify the film, then taken out and cooled at room temperature for 30min, and accurately weighed; then transferred into a 500mL conical flask with a stopper, and oscillated on a shaker at a speed of 100r / min for 15min, then screened with a 50 mesh sample sieve to remove the fallen film forming agent, and accurately weighed, and the film forming and falling off rate was calculated, each group was repeated for 3 times, and the average value was recorded, and the specific test results are shown in Table 1; The film forming and falling off rate calculation formula is as follows: ; In the formula, M is the mass of the seed before coating; M2 is the mass of the seed before oscillation after coating, and M3 is the mass of the coated seed after oscillation; Table 1 From the data of Table 1, it can be seen that the agricultural seed coating aid prepared by the present application has good film forming property. Among them, the PEGMA grafted block copolymer has adhesion and flexibility, can tightly wrap the seed and the film structure is stable; chitinous oligosaccharide, fulvic acid and the like also assist to enhance the bonding force of the film and the seed. Comparative Example 1 is less than Example 1 due to the lack of PEGMA grafting step, the compatibility of the block copolymer with the system is slightly weak, and the film forming time is prolonged; Comparative Example 2 is less than Comparative Example 1, and the embedding of polybutyl acrylate is lacking, which reduces the film forming flexibility and crack resistance, so the film forming shedding rate of Comparative Example 2 is higher than that of Comparative Example 1; Comparative Example 3 is less than Comparative Example 2, and lacks chitinous oligosaccharide, and only relies on simple mixing, the film forming material is not uniformly dispersed, the film forming time is prolonged, and the film structure is loose, so the film forming shedding rate of Comparative Example 3 is higher than that of Comparative Example 2.

[0032] (3) Suspension rate test: the agricultural seed coating aid in Example 1, Comparative Examples 1-3, imidacloprid and water were mixed in a mass ratio of 5:2:93 to prepare a solution; and the suspension rate (%) of the preparation was determined according to GB / T 14825-2006, and the specific test results are shown in Table 2; Table 2 From the test results in Table 2, it can be seen that the agricultural seed coating aid prepared in Example 1 has certain dispersing performance. Comparative Example 1 is less than Example 1 due to the lack of PEGMA grafting, the steric hindrance and hydrophilicity of the dispersant are insufficient, and the suspension rate is reduced to 84.3%. Comparative Example 2 is less than Comparative Example 1, and lacks the embedding of polybutyl acrylate, and only uses poly 3,4-dihydroxyphenethyl acrylate as the basis, the hydrophobic segment is reduced, which reduces the adsorption of hydrophobic pesticide imidacloprid particles, leading to the mutual aggregation of pesticide particles due to their own hydrophobic effect, which is not conducive to dispersibility. Comparative Example 3 is less than Comparative Example 2, and only poly 3,4-dihydroxyphenethyl acrylate and other components are simply mixed, which cannot form a stable hydration layer and cannot directionally adsorb pesticide particles, and the particle dispersion in the system is chaotic, which is easily settled by gravity, and the suspension rate is reduced.

[0033] (4) Emergence rate test: the agricultural seed coating adjuvant in Example 1, the agricultural seed coating adjuvant in Comparative Example 1-3, imidacloprid and water were mixed according to the mass ratio of 5:2:93 to prepare a solution; the seeds were treated with the solution, and dried in the shade to obtain treated corn and wheat seeds; after the treated seeds were dried, the same number of untreated corn and wheat seeds and the treated corn and wheat seeds were sown in the seedling hole tray, and clean river sand containing an appropriate amount of water was placed in the hole tray in advance, and each hole was sown, and then the seedling hole tray was placed in a light incubator, and cultured at 24℃ for 8 days and at 15℃ for 7 days, and then the emergence rate (the number of emergence holes accounted for the percentage of the number of sowing holes) was measured after 15 days of sowing, and the relevant biochemical indicators were randomly sampled and measured, each treatment was repeated 3 times, and the test results are shown in Table 3; Table 3 From the test results in Table 3, it can be seen that the agricultural seed coating adjuvant prepared in Example 1 can improve the emergence rate of corn and wheat, which is mainly due to the good film-forming property of the agricultural seed coating adjuvant, which can retain water and resist low temperature, and chitooligosaccharide and γ-polyglutamic acid can also stimulate seed germination, and chitooligosaccharide can be recognized by the cell wall enzyme of fusarium and preferentially adsorbed to form a locally strengthened protective layer, which is beneficial to inhibit diseases and promote emergence. The film-forming property of Comparative Example 1 is lower than that of Example 1, the ability to reduce water and nutrient loss is weakened, and therefore the emergence rate is lower than that of Comparative Example 1. Compared with Comparative Example 1, the film crack resistance and adhesion of Comparative Example 2 are reduced, and the components that are beneficial to seed germination cannot play a role, and therefore the emergence rate of Comparative Example 2 is lower than that of Comparative Example 1; compared with Comparative Example 2, Comparative Example 3 lacks chitooligosaccharide, and therefore is not conducive to seed emergence, and therefore the emergence rate of Comparative Example 2 is higher than that of Comparative Example 3.

[0034] The above content is only an example and description of the structure of the present application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the structure of the present application or exceed the scope defined by the present claims, which shall belong to the protection scope of the present application.

[0035] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The preferred embodiments of the application disclosed above are only to facilitate the elucidation of the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments. Obviously, many modifications and variations can be made in light of the teachings above. The description is chosen and described in order to provide the best illustration of the application and its practical application to those skilled in the art and to enable those skilled in the art to utilize the application in its best mode. The application is only limited by the claims and their full scope and equivalents.

Claims

1. A method for the preparation of an agricultural seed-dressing adjuvant, characterized in that, It comprises the following steps: Step (1) under nitrogen protection, 3,4-dihydroxyphenethyl acrylate, benzyl dithiobenzoate, AIBN are added into tetrahydrofuran, heated and reacted, and then a mixed solution is added, and the product is obtained by standing, filtering and washing; Step (2) poly-3,4-dihydroxyphenethyl acrylate, butyl acrylate and stannous octoate are mixed, heated and reacted, and then purified to obtain a block copolymer; Step (3) the block copolymer, PEGMA, a photoinitiator and tetrahydrofuran are mixed and reacted under ultraviolet light at room temperature, and then the product is obtained by rotary evaporation; Step (4) the PEGMA grafted block copolymer, chitinous oligosaccharide, water-soluble organic matter, water-retaining agent and water are mixed and homogenized to obtain an agricultural seed coating agent.

2. The method of preparing an agricultural seed coating agent according to claim 1, characterized in that, In step (1), the mass ratio of 3,4-dihydroxyphenethyl acrylate, benzyl dithiobenzoate, AIBN and tetrahydrofuran is 100:(5-7):(1-1.4):(400-600); the reaction conditions are as follows: the reaction is carried out at 45-55℃ for 2-3h.

3. The method of preparing an agricultural seed coating agent according to claim 1, wherein In step (2), the mass ratio of poly-3,4-dihydroxyphenethyl acrylate, butyl acrylate and stannous octoate is 100:(280-300):(0.1-0.2); the reaction conditions are as follows: the reaction is carried out at 75-85℃ for 2-4h.

4. The method of preparing an agricultural seed coating agent according to claim 1, characterized in that, In step (3), the mass ratio of the block copolymer, PEGMA, a photoinitiator and tetrahydrofuran is (600-800):(300-400):(4-8):(1800-2600); the wavelength of ultraviolet light is 254nm; the photoinitiator is benzoin ethyl ether; and the reaction time is 2-3h.

5. The method of preparing an agricultural seed coating agent according to claim 1, wherein In step (4), the mass ratio of the PEGMA grafted block copolymer, chitinous oligosaccharide, water-soluble organic matter, water-retaining agent and water is (10-18):(4-6):(3-5):(1-3):(80-120).

6. The method of preparing an agricultural seed coating agent according to claim 1, wherein In step (4), the water-soluble organic matter is one or more of fulvic acid, fulvic acid salt and humic acid salt.

7. The method of preparing an agricultural seed coating agent according to claim 1, wherein In step (4), the water-retaining agent is γ-polyglutamic acid.

8. An agricultural seed coating agent adjuvant, characterized in that, The agricultural seed coating agent is prepared by the method of any one of claims 1-7.

9. An agricultural seed coating agent characterized in that, The agricultural seed coating agent of claim 8 is used.

10. The use of the agricultural seed coating agent of claim 9 in improving the emergence rate of corn and wheat seeds.

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