Film-forming agent with uniform coating and process for its preparation

Abstract

This invention relates to the field of film-forming agent technology, and proposes a uniformly coated film-forming agent and its preparation process. The uniformly coated film-forming agent comprises the following components in parts by weight: 20-25 parts film-forming material, 3-6 parts dispersant, 5-10 parts additive, and 2-4 parts filler; the additive consists of a first plant gum, a second plant gum, and polyethylene wax; the first plant gum is locust bean gum, and the second plant gum is gum arabic and / or fenugreek gum. This technical solution solves the problem of poor coating uniformity in related technologies.

Description

Technical Field

[0001] This invention relates to the field of film-forming agent technology, specifically to a uniformly coated film-forming agent and its preparation process. Background Technology

[0002] Seed coating technology is a key means in modern agriculture to improve seed resistance and ensure seedling quality. The film-forming agent, as the core component of the coating formula, directly determines the coating effect, with coating uniformity being one of the core indicators for evaluating its quality. Currently, most seed coating film-forming agents use polyvinyl alcohol, hydroxypropyl methylcellulose, and chitosan as their main base materials, and generally suffer from poor coating uniformity, severely restricting the application effect of coating technology.

[0003] The main reason for the poor coating uniformity of existing film-forming agents is the poor compatibility of the components. The large difference in interfacial tension between hydrophilic and hydrophobic components easily leads to phase separation, resulting in uneven film thickness, localized white spots, or clumping during the film-forming process. Simultaneously, the weak bonding between ordinary inorganic fillers and the organic matrix, coupled with improper viscosity control in some film-forming agents, further exacerbates the problem of uneven coating, resulting in excessive coating of small seeds and insufficient coating of large seeds.

[0004] Insufficient coating uniformity leads to uneven adhesion of active ingredients in seed coating agents, which not only reduces the slow-release effect and pest and disease control efficiency, but may also inhibit seed germination due to localized phytotoxicity, or result in uneven emergence and decreased germination rate due to insufficient coating, ultimately affecting crop yield and quality. Therefore, solving the problem of poor coating uniformity of film-forming agents has become a key bottleneck that urgently needs to be overcome in the current seed coating technology field. Summary of the Invention

[0005] This invention proposes a uniformly coated film-forming agent and its preparation process, which solves the problem of poor coating uniformity of film-forming agents in related technologies.

[0006] The technical solution of the present invention is as follows: The present invention proposes a uniformly coated film-forming agent, comprising the following components in parts by weight: 20-25 parts of film-forming material, 3-6 parts of dispersant, 5-10 parts of additive, and 2-4 parts of filler; The additive consists of a first plant gum, a second plant gum, and polyethylene wax; the first plant gum is locust bean gum, and the second plant gum is gum arabic and / or fenugreek gum.

[0007] As a further technical solution, the mass ratio of the first plant gum, the second plant gum, and the polyethylene wax is 1~3:1:0.5.

[0008] As a further technical solution, the second plant gum is fenugreek gum.

[0009] As a further technical solution, the fenugreek gum is sodium alginate composite fenugreek gum.

[0010] As a further technical solution, the raw materials in the sodium alginate composite fenugree gum include sodium alginate and fenugree gum in a mass ratio of 0.5~0.8:2.

[0011] As a further technical solution, the preparation method of the sodium alginate composite fenugree gum includes the following steps: stirring and mixing sodium alginate and fenugree gum to obtain sodium alginate composite fenugree gum.

[0012] As a further technical solution, the filler includes silica and / or calcium carbonate; the film-forming material includes polyvinyl alcohol.

[0013] As a further technical solution, the dispersant includes at least one of alkyl polyoxyethylene ether, alkylphenol polyoxyethylene ether sodium sulfate, alkyl polyoxyethylene ether ammonium sulfate, alkyl polyoxyethylene ether phosphate, and phenylphenol polyoxyethylene ether.

[0014] This invention also proposes a preparation process for a uniformly coated film-forming agent, characterized by comprising the following steps: Film-forming materials, dispersants, additives, and fillers are mixed with water to obtain a film-forming agent.

[0015] As a further technical solution, the mixing process involves first dispersing at 400-600 rpm for 15-20 minutes, and then dispersing at 1200-1300 rpm for 10-15 minutes.

[0016] The working principle and beneficial effects of this invention are as follows: In this invention, the film-forming agent significantly improves coating uniformity through a rational combination of components, especially optimized additive combinations: polyvinyl alcohol is used as the film-forming material to ensure the basic shapeability of the film layer; the dispersant enhances the dispersion stability of each component; and the filler optimizes the film layer density. The key lies in the use of a compound of locust bean gum, a second plant gum (gum arabic and / or fenugreek gum), and polyethylene wax as additives. Locust bean gum and the second plant gum synergistically regulate the viscosity of the system, reducing the interfacial tension between hydrophilic and hydrophobic components and preventing phase separation; polyethylene wax improves film flowability, reducing film layer accumulation and whitening. These three components synergistically significantly improve coating uniformity. Ultimately, this ensures uniform adhesion of the active ingredients in the seed coating agent, significantly improving the coating uniformity of the film-forming agent. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] The specific information of the components used in the following examples and comparative examples is as follows: The polyvinyl alcohol is designated as BF-24. The alkyl polyoxyethylene ether is designated as AEO-7; The particle size of silicon dioxide is 30 nm.

[0019] Example 1 The uniformly coated film-forming agent comprises the following components in parts by weight: 20 parts polyvinyl alcohol, 3 parts alkyl polyoxyethylene ether, 5 parts additives, and 2 parts silica; the additives consist of a first plant gum, a second plant gum, and polyethylene wax in a mass ratio of 1:1:0.5; the first plant gum is locust bean gum, and the second plant gum is gum arabic. The preparation process of a uniformly coated film-forming agent includes the following steps: Polyvinyl alcohol, alkyl polyoxyethylene ether, additives, and silica were dispersed with water at 400 rpm for 20 min and then at 1200 rpm for 15 min. After being mixed evenly, a film-forming agent was obtained.

[0020] Example 2 The uniformly coated film-forming agent comprises the following components in parts by weight: 25 parts polyvinyl alcohol, 6 parts alkyl polyoxyethylene ether, 10 parts additives, and 4 parts silica; the additives consist of a first plant gum, a second plant gum, and polyethylene wax in a mass ratio of 3:1:0.5; the first plant gum is locust bean gum, and the second plant gum is gum arabic. The preparation process of a uniformly coated film-forming agent includes the following steps: Polyvinyl alcohol, alkyl polyoxyethylene ether, additives, and silica were dispersed with water at 600 rpm for 15 min and then at 1300 rpm for 10 min. After being mixed evenly, a film-forming agent was obtained.

[0021] Example 3 The uniformly coated film-forming agent comprises the following components in parts by weight: 22 parts polyvinyl alcohol, 5 parts alkyl polyoxyethylene ether, 6 parts additives, and 3 parts silica; the additives consist of a first plant gum, a second plant gum, and polyethylene wax in a mass ratio of 2:1:0.5; the first plant gum is locust bean gum, and the second plant gum is gum arabic. The preparation process of a uniformly coated film-forming agent includes the following steps: Polyvinyl alcohol, alkyl polyoxyethylene ether, additives, and silica were dispersed with water at 500 rpm for 18 min and then at 1300 rpm for 10 min. After being mixed evenly, a film-forming agent was obtained.

[0022] Example 4 The uniformly coated film-forming agent comprises the following components in parts by weight: 22 parts polyvinyl alcohol, 5 parts alkyl polyoxyethylene ether, 6 parts additives, and 3 parts silica; the additives consist of a first plant gum, a second plant gum, and polyethylene wax in a mass ratio of 2:1:0.5; the first plant gum is locust bean gum, and the second plant gum is fenugreek gum. The preparation process of a uniformly coated film-forming agent includes the following steps: Polyvinyl alcohol, alkyl polyoxyethylene ether, additives, and silica were dispersed with water at 500 rpm for 18 min and then at 1300 rpm for 10 min. After being mixed evenly, a film-forming agent was obtained.

[0023] Example 5 The uniformly coated film-forming agent comprises the following components in parts by weight: 22 parts polyvinyl alcohol, 5 parts alkyl polyoxyethylene ether, 6 parts additives, and 3 parts silica; the additives consist of a first plant gum, a second plant gum, and polyethylene wax in a mass ratio of 2:1:0.5; the first plant gum is locust bean gum, and the second plant gum is sodium alginate composite fenugreek gum; the preparation method of sodium alginate composite fenugreek gum includes the following steps: stirring and mixing sodium alginate and fenugreek gum to obtain sodium alginate composite fenugreek gum; The preparation process of a uniformly coated film-forming agent includes the following steps: Polyvinyl alcohol, alkyl polyoxyethylene ether, additives, and silica were dispersed with water at 500 rpm for 18 min and then at 1300 rpm for 10 min. After being mixed evenly, a film-forming agent was obtained.

[0024] Comparative Example 1 The uniformly coated film-forming agent comprises the following components in parts by weight: 22 parts polyvinyl alcohol, 5 parts alkyl polyoxyethylene ether, 6 parts additives, and 3 parts silica; the additives consist of a first plant gum, sodium alginate, and polyethylene wax in a mass ratio of 2:1:0.5; the first plant gum is locust bean gum. The preparation process of a uniformly coated film-forming agent includes the following steps: Polyvinyl alcohol, alkyl polyoxyethylene ether, additives, and silica were dispersed with water at 500 rpm for 18 min and then at 1300 rpm for 10 min. After being mixed evenly, a film-forming agent was obtained.

[0025] Comparative Example 2 The uniformly coated film-forming agent comprises the following components in parts by weight: 22 parts polyvinyl alcohol, 5 parts alkyl polyoxyethylene ether, 6 parts additives, and 3 parts silica; the additives consist of a first plant gum and a second plant gum in a mass ratio of 2:1; the first plant gum is locust bean gum, and the second plant gum is gum arabic. The preparation process of a uniformly coated film-forming agent includes the following steps: Polyvinyl alcohol, alkyl polyoxyethylene ether, additives, and silica were dispersed with water at 500 rpm for 18 min and then at 1300 rpm for 10 min. After being mixed evenly, a film-forming agent was obtained.

[0026] Comparative Example 3 The uniformly coated film-forming agent comprises the following components in parts by weight: 22 parts polyvinyl alcohol, 5 parts alkyl polyoxyethylene ether, 6 parts additives, and 3 parts silica; the additives consist of a first plant gum and polyethylene wax in a mass ratio of 2:0.5; the first plant gum is locust bean gum; The preparation process of a uniformly coated film-forming agent includes the following steps: Polyvinyl alcohol, alkyl polyoxyethylene ether, additives, and silica were dispersed with water at 500 rpm for 18 min and then at 1300 rpm for 10 min. After being mixed evenly, a film-forming agent was obtained.

[0027] Comparative Example 4 The uniformly coated film-forming agent comprises the following components in parts by weight: 22 parts polyvinyl alcohol, 5 parts alkyl polyoxyethylene ether, 6 parts additives, and 3 parts silica; the additives consist of a second plant gum and polyethylene wax in a mass ratio of 1:0.5; the second plant gum is gum arabic. The preparation process of a uniformly coated film-forming agent includes the following steps: Polyvinyl alcohol, alkyl polyoxyethylene ether, additives, and silica were dispersed with water at 500 rpm for 18 min and then at 1300 rpm for 10 min. After being mixed evenly, a film-forming agent was obtained.

[0028] Experimental Example 1 The properties of the film-forming agents prepared in Examples 1-5 and Comparative Examples 1-4 were tested respectively: After the film-forming agent was formulated into a thiamethoxam suspension seed coating agent with an effective ingredient content of 30% (the mass of the film-forming agent was 3% of the mass of the thiamethoxam suspension seed coating agent), it was tested according to the standard GB / T 17768-1999 "Results of the Specification for Writing Suspension Seed Coating Agent Product Standards", as shown in Table 1 below.

[0029] Table 1 Test Results

[0030] Compared with Comparative Examples 1-4, the film-forming agents prepared in Examples 1-5 showed higher seed coating uniformity, indicating that the additives in the film-forming agents, consisting of locust bean gum, a second plant gum (gum arabic and / or fenugreek gum) and polyethylene wax, significantly improved the coating uniformity of the film-forming agents. In particular, Examples 4-5 further improved the coating uniformity by using fenugreek gum or sodium alginate combined with fenugreek gum as the second plant gum.

[0031] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A uniformly coated film-forming agent, characterized in that, It includes the following components in parts by weight: 20-25 parts film-forming material, 3-6 parts dispersant, 5-10 parts additive, and 2-4 parts filler; The additive consists of a first plant gum, a second plant gum, and polyethylene wax; the first plant gum is locust bean gum, and the second plant gum is gum arabic and / or fenugreek gum.

2. The film-forming agent with uniform coating according to claim 1, characterized in that, The mass ratio of the first plant gum, the second plant gum, and the polyethylene wax is 1~3:1:0.

5.

3. The film-forming agent with uniform coating according to claim 2, characterized in that, The second plant-based gum is fenugreek gum.

4. The uniformly coated film-forming agent according to claim 3, characterized in that, The fenugreek gum is sodium alginate compound fenugreek gum.

5. The uniformly coated film-forming agent according to claim 4, characterized in that, The raw materials in the sodium alginate composite fenugree gum include sodium alginate and fenugree gum in a mass ratio of 0.5~0.8:

2.

6. The uniformly coated film-forming agent according to claim 4, characterized in that, The preparation method of the sodium alginate composite fenugree gum includes the following steps: stirring and mixing sodium alginate and fenugree gum to obtain sodium alginate composite fenugree gum.

7. The uniformly coated film-forming agent according to claim 1, characterized in that, The filler includes silica and / or calcium carbonate; the film-forming material includes polyvinyl alcohol.

8. The uniformly coated film-forming agent according to claim 1, characterized in that, The dispersant includes at least one of alkyl polyoxyethylene ether, alkylphenol polyoxyethylene ether sodium sulfate, alkyl polyoxyethylene ether ammonium sulfate, alkyl polyoxyethylene ether phosphate, and phenylphenol polyoxyethylene ether.

9. A process for preparing a uniformly coated film-forming agent, used to prepare the uniformly coated film-forming agent according to any one of claims 1 to 8, characterized in that, Includes the following steps: Film-forming materials, dispersants, additives, and fillers are mixed with water to obtain a film-forming agent.

10. The preparation process of a uniformly coated film-forming agent according to claim 9, characterized in that, During the mixing process, the mixture is first dispersed at 400-600 rpm for 15-20 min, and then dispersed at 1200-1300 rpm for 10-15 min.

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