Preparation method of single-component high-temperature fast curing silver-aluminum polymer coating applied to surface of coating layer

Abstract

The invention belongs to the technical field of coating protection, and particularly relates to a preparation method of a single-component high-temperature fast curing silver-aluminum polymer coating applied to the surface of a coating layer. Comprising 175-180 parts of modified epoxy resin; 95 to 100 parts of flaky aluminum silver powder; 180-200 parts of a mixed solvent of dimethylbenzene and / n-butyl alcohol; 100 to 120 parts of dicyandiamide; 25 to 40 parts of 3-(3, 4-dichlorophenyl)-1, 1-dimethylurea; 10 to 12 parts of sodium molybdate; 4-8 parts of graphite; 1 to 2 parts of polydimethylsiloxane; 2 to 6 parts of a wetting agent HY-352; 3-5 parts of fumed silica; 0.5 to 3 parts of dimethyl silicone oil; and 0.2-2 parts of a hydroxymethyl cellulose agent. The coating disclosed by the invention has the advantages of thin coating, high-temperature rapid curing, relatively good corrosion resistance, good combination with a coating layer and the like, and also has excellent storage stability.

Description

Technical Field

[0001] This invention relates to the field of special coating protection, specifically a method for preparing a single-component, high-temperature, rapid-curing silver-aluminum polymer coating for use on the surface of a coating layer. Background Technology

[0002] Aluminum coatings, with their superior corrosion resistance, have found widespread application in various industrial sectors, including power, transportation, construction, and petrochemicals. Traditional aluminum coatings use organic resins as the main film-forming substance, working synergistically with flake-shaped aluminum powder fillers to achieve long-term protection of the substrate. The aluminum powder layers within the coating form an effective barrier, preventing the penetration of moisture, oxygen, and corrosive ions. Simultaneously, the resin matrix imparts excellent adhesion and film-forming properties, ensuring the coating's firmness and integrity, exhibiting outstanding corrosion resistance. Furthermore, these coatings also possess good decorative properties and weather resistance—the directional arrangement of the aluminum powder creates a bright metallic texture, enhancing the appearance; the coating also provides long-term resistance to ultraviolet radiation, temperature changes, and rain erosion, demonstrating excellent durability.

[0003] However, the following shortcomings exist for single-component high-temperature curing aluminum coatings: (1) In a single-component system, the curing agent is prone to cross-linking reaction with the resin, resulting in poor storage stability and reduced coating performance; (2) Under high temperature conditions, the coating cannot be cured quickly in a short time (8~20s), making it impossible to achieve online coating on the production line, especially for pipes and wires; (3) After the coating is cured, the coating performance is poor, and the bonding with the coating layer and substrate is poor, which cannot effectively protect the coating layer and substrate material.

[0004] To address these three major technical challenges, this invention modifies epoxy resin using a modifier, uses flake aluminum silver powder as an anti-corrosion filler, and optimizes the component ratio of the system. This successfully solves the shortcomings of the existing technology and significantly improves the overall performance of the material. Summary of the Invention

[0005] The purpose of this invention is to provide a single-component, high-temperature, rapid-curing silver-aluminum polymer coating for use on the surface of a coating layer. This coating features a thin coating, rapid high-temperature curing, excellent corrosion resistance, excellent adhesion to the coating layer, and excellent storage stability. It solves the problems of corrosion resistance of the coating layer itself and rapid high-temperature curing of the coating, greatly increasing the neutral salt spray resistance of the composite coating layer.

[0006] The technical solution of this invention is: a single-component, high-temperature, rapid-curing silver-aluminum polymer coating applied to the surface of a coating layer, characterized in that it comprises the following components in parts by weight: Modified epoxy resin: 175-180; flake aluminum powder: 95-100; xylene and / or n-butanol mixed solvent: 180-200; dicyandiamide: 100-120; 3-(3,4-dichlorophenyl)-1,1-dimethylurea: 25-40; sodium molybdate: 10-12; graphite: 4-8; polydimethylsiloxane: 1-2; wetting agent HY-352: 2-6; fumed silica: 3-5; dimethyl silicone oil: 0.5-3; hydroxymethyl cellulose agent: 0.2-2.

[0007] This invention also discloses a method for preparing the above-mentioned single-component high-temperature rapid-curing silver-aluminum polymer coating applied to the surface of the coating layer, characterized in that: First: Add 30g of modifier KH570 to 200g of epoxy resin, and stir at 1500 r / min for 30 min under high speed to obtain modified epoxy resin for later use.

[0008] Then: the modified resin was dispersed in a mixed solvent of xylene and n-butanol and stirred thoroughly in a high-speed mixer at 1500 r / min for 30 min; dicyandiamide was added and stirring was continued for 30 min; flake aluminum silver powder was added and stirred thoroughly for 50 min; then 3-(3,4-dichlorophenyl)-1,1-dimethylurea, sodium molybdate, graphite, polydimethylsiloxane, wetting agent HY-352, fumed silica, dimethyl silicone oil, and hydroxymethyl cellulose were added in sequence. After all the additions were completed, the mixture was stirred thoroughly for another 60 min to obtain the final product.

[0009] The advantages of this invention are: 1. The single-component coating provided by this invention has excellent storage stability. After being stored at 5~30℃ for 6~12 months, no clumping or discoloration occurs; the coating after application still has excellent performance. 2. The coating of this invention has the characteristic of high-temperature rapid curing. When the coating is applied to the coated sample, it can cure within 10-30 minutes at 200-300℃, and can be rapidly cured in only 5-20 seconds at 800-1000℃. This solves the practical problem of the difficulty in achieving rapid curing under high-temperature conditions (800-1000℃), and provides a fundamental solution, especially for on-site coating of pipes and wires. 3. The coating of this invention is relatively thin, with a thickness of only 2~8μm, and the neutral salt spray time of the coating can reach 1000h; 4. The preparation method of the single-component high-temperature rapid curing silver-aluminum polymer coating provided by the present invention has a simple preparation process and is applicable to large-scale industrial production. Detailed Implementation

[0010] The present invention will be further described in detail below through embodiments.

[0011] Examples 1-4: A single-component, high-temperature, rapid-curing silver-aluminum polymer coating applied to the surface of a coating layer, comprising the components in the mass fractions shown in Table 1.

[0012] Table 1. Mass fractions of each component in each embodiment

[0013] A method for preparing a single-component, high-temperature, rapid-curing silver-aluminum polymer coating for use on the surface of a coating layer, comprising: 1. Epoxy resin modification: Add 30g of modifier KH570 to 200g of epoxy resin and stir at 1500r / min for 30 min under high speed to obtain modified epoxy resin for later use.

[0014] 2. Preparation of coating: The modified resin was dispersed in a mixed solvent of xylene and n-butanol and stirred thoroughly in a high-speed mixer at 1500 r / min for 30 min; dicyandiamide was added and stirring was continued for 30 min; flake aluminum silver powder was added and stirred thoroughly for 50 min; then 3-(3,4-dichlorophenyl)-1,1-dimethylurea, sodium molybdate, graphite, polydimethylsiloxane, wetting agent HY-352, fumed silica, dimethyl silicone oil, and hydroxymethyl cellulose were added in sequence. After all the additions were completed, the mixture was stirred thoroughly for 60 min to obtain a single-component high-temperature fast-curing silver-aluminum polymer coating.

[0015] 3. Conduct storage stability tests: The products prepared in Examples 1-4 were subjected to the following tests: After being stored at 5–30℃ for 12 months (the samples were placed in the applicant's warehouse, with appropriate heating in winter to maintain the required temperature, for one year), the coatings were observed to show signs of clumping or discoloration. Observations showed that none of the above products exhibited clumping or discoloration.

[0016] The coating was applied to the coated sample and cured within 10-30 minutes at 200-300℃. At high temperatures, film was formed within the corresponding curing temperature and time, and the coating thickness and adhesion were measured. Tests showed good adhesion to the substrate. Specific data are shown in Table 2.

[0017] After a 1000-1200 hour neutral salt spray test, the presence of red rust was observed. No red rust was found during the test.

[0018] Table 2 Stability Test

[0019] In summary, the coating of this invention exhibits high-temperature rapid curing characteristics. When applied to coated samples, it cures rapidly in just 5-20 seconds at temperatures of 800-1000℃. This solves the practical problem of achieving rapid curing under high-temperature conditions (800-1000℃), providing a fundamental solution, especially for on-site coating of pipes and wires. The coating of this invention is relatively thin, with a thickness of only 2-8 μm, and its neutral salt spray time can reach 1000 hours.

Claims

1. A single-component, high-temperature, rapid-curing silver-aluminum polymer coating applied to the surface of a coating layer, characterized in that: The components include the following parts by mass: Modified epoxy resin: 175-180; Flake aluminum silver powder: 95-100; Xylene and / or n-butanol mixed solvent: 180-200; Dicyandiamide: 100-120; 3-(3,4-dichlorophenyl)-1,1-dimethylurea: 25-40; Sodium molybdate: 10-12; Graphite: 4-8; Polydimethylsiloxane: 1-2; Wetting agent HY-352: 2-6; Fumed silica: 3-5; Dimethyl silicone oil: 0.5-3; Hydroxymethyl cellulose agent: 0.2-2.

2. A method for preparing a single-component, high-temperature, rapid-curing silver-aluminum polymer coating for use on the surface of a coating layer, characterized in that: First: Add 30g of modifier KH570 to 200g of epoxy resin, and stir at 1500 r / min for 30min under high speed to obtain modified epoxy resin for later use. Then: the modified resin was dispersed in a mixed solvent of xylene and n-butanol and stirred thoroughly in a high-speed mixer at 1500 r / min for 30 min; dicyandiamide was added and stirring was continued for 30 min; flake aluminum silver powder was added and stirred thoroughly for 50 min; then 3-(3,4-dichlorophenyl)-1,1-dimethylurea, sodium molybdate, graphite, polydimethylsiloxane, wetting agent HY-352, fumed silica, dimethyl silicone oil, and hydroxymethyl cellulose were added in sequence. After all the additions were completed, the mixture was stirred thoroughly for another 60 min to obtain the final product.

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