Preparation method of heat-insulating antibacterial steel plate
By combining activated modified copper oxide quantum dots with hemp fiber, a heat-insulating and antibacterial coating is developed, which solves the problems of rapid heat conduction and easy microbial growth on the surface of steel plates at high temperatures. This achieves a synergistic effect of low thermal conductivity and high antibacterial rate, and has long-lasting and stable properties.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUZHOU XINGHEYUAN COMPOSITE MATERIALS CO LTD
- Filing Date
- 2026-04-20
- Publication Date
- 2026-05-19
AI Technical Summary
Existing steel plates have high thermal conductivity at high temperatures, resulting in rapid heat transfer that affects equipment energy efficiency and service life. At the same time, microorganisms easily grow on the surface, posing a risk of cross-infection. Existing antibacterial and heat insulation functions are difficult to achieve simultaneously and lack durability.
Activated modified copper oxide quantum dots are combined with hemp fibers and uniformly dispersed through ultrasonic technology. Ceramic microspheres are added to enhance infrared reflection. Combined with cerium oxide precursor and polymethyl methacrylate matrix, a heat-insulating and antibacterial coating is formed. The coating's stability and antibacterial properties are achieved through thermosetting treatment.
It achieves a low thermal conductivity (0.032 W/(m·K) and a high antibacterial rate (99.3%-98.7%), effectively blocking heat transfer at high temperatures and maintaining long-lasting antibacterial activity in low-light environments. After 100 washes, the performance degradation rate is less than 7%.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of coating technology, specifically to a method for preparing a heat-insulating and antibacterial steel plate. Background Technology
[0002] Steel plates, as a widely used basic material in modern industry, play an irreplaceable role in fields such as construction, transportation, home appliance manufacturing, and food processing. However, traditional steel plates have two significant drawbacks in practical applications: first, their high thermal conductivity leads to rapid heat transfer at high temperatures, affecting equipment efficiency and lifespan; second, their surface is prone to microbial growth, especially in places with strict hygiene requirements such as medical facilities, food processing workshops, and public facilities, where bacterial proliferation on the steel plate surface not only affects environmental hygiene but may also pose a risk of cross-infection.
[0003] In terms of thermal insulation improvement, existing technologies mainly achieve this by coating the steel plate surface with thermal insulation coatings or composite thermal insulation layers. Common methods include adding low thermal conductivity materials such as hollow microspheres, aerogels, or ceramic particles. For example, ceramic microspheres are widely used in thermal insulation coatings due to their low thermal conductivity and good infrared reflectivity, which can effectively reduce heat conduction. However, relying solely on physical filling methods often makes it difficult to balance coating thickness, adhesion, and thermal insulation efficiency. Furthermore, conventional fillers have limited dispersibility in the matrix, leading to a decline in thermal insulation performance over time.
[0004] In the development of antibacterial functions, existing technologies mostly employ the addition of metal ions or metal oxides such as silver, copper, and zinc as antibacterial agents. Among these, copper-based antibacterial materials have attracted attention due to their broad-spectrum antibacterial properties, heat resistance, and relatively low cost. However, traditional micron-sized copper compounds tend to aggregate in polymer matrices, limiting their release efficiency, and their antibacterial activity depends on high dosages, potentially affecting the coating's mechanical properties and appearance. In recent years, copper oxide quantum dots have become a research hotspot due to their small size effect, high surface activity, and excellent photocatalytic performance; however, the dispersion stability of quantum dots and the interfacial bonding strength with the matrix remain technical challenges. Furthermore, some studies have attempted to introduce natural antibacterial fibers such as hemp, but their antibacterial properties are weak and lack long-lasting effects, making it difficult to meet stringent antibacterial requirements on their own. Simultaneously, antibacterial components are prone to deactivation due to photo-oxidation, washing, or high-temperature environments during long-term use, limiting the coating's durability. Therefore, how to achieve efficient synergy between antibacterial and heat insulation functions while ensuring the coating's stability, durability, and environmental adaptability has become a pressing technical challenge in the field of functional modification of steel plates. Summary of the Invention
[0005] The purpose of this invention is to provide a method for preparing heat-insulating and antibacterial steel plates to solve the problems existing in the prior art.
[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a heat-insulating and antibacterial steel plate, comprising the following preparation steps: (1) Hemp fiber was dispersed in N,N-dimethylformamide, sonicated at 21 kHz for 30 min, an alkaline catalyst was added, and the mixture was stirred at 300 rpm until dissolved. Then, activated and modified copper oxide quantum dots were added, and the mixture was first placed in an oil bath at 70 ℃ for 10-15 h. The reaction was then assisted by ultrasonic technology. Finally, the mixture was washed three times each with N,N-dimethylformamide, ethanol, and deionized water, and dried at -50 ℃ for 24 h to obtain the functional filler. (2) Mix cerium nitrate and deionized water, stir at 100 rpm for 30 min, adjust the pH of the solution to 9 with sodium hydroxide solution, add polyvinylpyrrolidone, functional filler and ceramic microspheres, continue stirring for 30 min, then heat the reaction, and then add methyl methacrylate and its initiator, and polymerize by stirring at 200 rpm to obtain heat-insulating and antibacterial coating. (3) Apply the heat-insulating and antibacterial coating to the steel plate with a wet film thickness of 40 μm. After heat curing, raise the temperature to 80°C at 2°C / min and keep it at that temperature for 10 minutes. Then raise the temperature to 130°C and keep it at that temperature for 1 hour. Next, lower the temperature to 60°C at 5°C / min and let it cool naturally to room temperature.
[0007] Furthermore, in step (1), the mass ratio of hemp fiber, N,N-dimethylformamide, alkaline catalyst, and activated modified copper oxide quantum dots is 5:30-70:1:1-3.
[0008] Furthermore, the alkaline catalyst in step (1) is potassium carbonate.
[0009] Further, the preparation method of the activated and modified copper oxide quantum dots in step (1) is as follows: calcining copper oxide quantum dots at 700℃ for 1.5h, then immersing them in 1wt% nitric acid solution at a bath ratio of 1:10-50, stirring at 60℃ and 300rpm for 2h, then washing them three times with deionized water, placing them in a mixed solution of ethanol and deionized water with a volume ratio of ethanol to deionized water of 3:1, adding citric acid, sonicating at 21kHz for 30min, stirring at 60℃ and 500rpm for 6h, then washing them three times each with ethanol and deionized water, and drying them at -50℃ for 24h to obtain the product; the mass ratio of the copper oxide quantum dots, the mixed solution, and citric acid is 1:40:5.
[0010] Furthermore, the process parameters for the ultrasonic-assisted reaction in step (1) are: ultrasonic frequency of 40 kHz and time of 30 min.
[0011] Furthermore, in step (2), the mass ratio of cerium nitrate, deionized water, polyvinylpyrrolidone, functional filler, methyl methacrylate, initiator, and ceramic microspheres is 1.5:10:0.6:3:20:0.2:3.
[0012] Furthermore, the initiator in step (2) is benzoyl peroxide.
[0013] Furthermore, the specific steps of the heating reaction described in step (2) are as follows: first react at 70°C for 4 hours, then react at 110-170°C for 5-12 hours.
[0014] Furthermore, the polymerization in step (2) is carried out at a temperature of 60-80°C for 8 hours.
[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: (1) This invention utilizes copper oxide quantum dots grafted onto hemp particles. By activating and modifying the copper oxide quantum dots and reacting with the hydroxyl groups on the hemp, combined with mechanical force, the copper oxide quantum dots fill the hemp fibers. Through the benzene ring structure in the hemp and the ultraviolet absorption of the quantum dots, a broad-spectrum protection is formed, realizing a dual protection mechanism against ultraviolet radiation. The mechanical properties of the matrix are enhanced by the complementary structure of the two, delaying the aging of the matrix, thereby achieving long-lasting anti-ultraviolet performance. At the same time, the hemp modified with copper oxide quantum dots is uniformly dispersed in the polymer matrix, and the organic pollutants are degraded by copper oxide, thereby enabling the matrix to achieve hydrophobic self-cleaning properties. Then, it is introduced into the polymethyl methacrylate matrix along with the cerium dioxide precursor. The quantum size effect of copper oxide enhances the surface energy of the matrix, thereby optimizing the crystal form and stability of cerium dioxide, thereby further enhancing the ultraviolet light absorption capacity and self-cleaning properties of the coating. After the coating is applied to the substrate, it is cured by heat to avoid photo-oxidative damage to the copper oxide quantum dots.
[0016] (2) Modified hemp fiber has low thermal conductivity. Combined with the infrared reflection effect enhanced by ceramic microspheres, the thermal conductivity of the coating is reduced to 0.032 W / (m·K), which effectively blocks the transfer of external heat to the substrate and meets the requirements of use under high temperature conditions.
[0017] (3) Based on the slow release of copper ions and photocatalytic generation of active oxygen from copper oxide quantum dots, combined with the physical antibacterial properties of hemp fiber, the coating achieves antibacterial rates of 99.3% and 98.7% against common pathogenic bacteria such as Escherichia coli and Staphylococcus aureus, respectively. Even in a low-light environment, the antibacterial activity remains above 95%, and the performance decay rate is less than 7% after 100 washing experiments, proving its advantages in environmental adaptability and durability. Detailed Implementation
[0018] 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.
[0019] To more clearly illustrate the method provided by the present invention, the following embodiments are provided in detail. The test methods for various indicators of the heat-insulating and antibacterial steel plates produced in the following embodiments are as follows: Self-cleaning: Take the same size examples and comparative examples, cover them with simulated contaminants, and irradiate them with ultraviolet light for 6 hours at a light intensity of 100mW / cm². 2 The degradation rate of the simulated pollutant was detected; the simulated pollutant was a mixture of 10 mg / L methylene blue solution and 50 mg / L phenol solution in a volume ratio of 1:1.
[0020] UV protection: Take samples of the same size as the example and comparative examples and place them in a UV accelerated aging test chamber at an irradiation intensity of 1.5 kWh / m². 2 Under the same conditions, the sample was exposed to ultraviolet light for 15 days and then removed for another test of the ultraviolet blocking rate.
[0021] Example 1 (1) Calcine copper oxide quantum dots at 700℃ for 1.5h, then impregnate them in 1wt% nitric acid solution at a bath ratio of 1:10, stir at 60℃ and 300rpm for 2h, then wash them three times with deionized water, place them in a mixed solution of ethanol and deionized water with a volume ratio of ethanol to deionized water of 3:1, add citric acid, sonicate at 21kHz for 30min, stir at 60℃ and 500rpm for 6h, then wash them three times each with ethanol and deionized water, and dry them at -50℃ for 24h to obtain activated and modified copper oxide quantum dots; the mass ratio of copper oxide quantum dots, mixed solution and citric acid is 1:40:5; disperse hemp fibers in N, N In N,N-dimethylformamide, an alkaline catalyst was added after sonication at 21 kHz for 30 min, and the mixture was stirred at 300 rpm until dissolved. Then, activated and modified copper oxide quantum dots were added. The mixture was first placed in an oil bath at 70 ℃ for 10 h, and then the reaction was assisted by ultrasonication at a frequency of 40 kHz for 30 min. Finally, the mixture was washed three times each with N,N-dimethylformamide, ethanol, and deionized water, and dried at -50 ℃ for 24 h to obtain the functional filler. The mass ratio of hemp fiber, N,N-dimethylformamide, alkaline catalyst, and activated and modified copper oxide quantum dots was 5:30:1:1. The length of the hemp fiber was 5 mm. The alkaline catalyst was potassium carbonate. (2) Cerium nitrate and deionized water are mixed and stirred at 100 rpm for 30 min. The pH of the solution is adjusted to 9 with sodium hydroxide solution. Polyvinylpyrrolidone, functional filler, and ceramic microspheres (supplier: Shanghai Huijingya Nanomaterials Co., Ltd., particle size 1-3 micrometers) are added. Stirring is continued for 30 min, and then the reaction is carried out by heating. First, the reaction is carried out at 70℃ for 4 h, and then at 110℃ for 5 h. Then, methyl methacrylate and its initiator are added. The mixture is stirred at 200 rpm and polymerized at 60℃ for 8 h to obtain a heat-insulating and antibacterial coating. The mass ratio of cerium nitrate, deionized water, polyvinylpyrrolidone, functional filler, methyl methacrylate, initiator, and ceramic microspheres is 1.5:10:0.6:3:20:0.2:3. The initiator is benzoyl peroxide. (3) Apply the heat-insulating and antibacterial coating to the steel plate with a wet film thickness of 40 μm. After heat curing, raise the temperature to 80°C at 2°C / min and keep it at that temperature for 10 minutes. Then raise the temperature to 130°C and keep it at that temperature for 1 hour. Next, lower the temperature to 60°C at 5°C / min and let it cool naturally to room temperature.
[0022] Example 2 (1) Calcine copper oxide quantum dots at 700℃ for 1.5h, then impregnate them in 1wt% nitric acid solution at a bath ratio of 1:30, stir at 60℃ and 300rpm for 2h, then wash them three times with deionized water, place them in a mixed solution of ethanol and deionized water with a volume ratio of ethanol to deionized water of 3:1, add citric acid, sonicate at 21kHz for 30min, stir at 60℃ and 500rpm for 6h, then wash them three times each with ethanol and deionized water, and dry them at -50℃ for 24h to obtain activated and modified copper oxide quantum dots; the mass ratio of copper oxide quantum dots, mixed solution and citric acid is 1:40:5; disperse hemp fibers in N, N In N,N-dimethylformamide, an alkaline catalyst was added after ultrasonication at 21 kHz for 30 min, and the mixture was stirred at 300 rpm until dissolved. Then, activated and modified copper oxide quantum dots were added. The mixture was first placed in an oil bath at 70 ℃ for 12 h, and then the reaction was assisted by ultrasonication at a frequency of 40 kHz for 30 min. Finally, the mixture was washed three times each with N,N-dimethylformamide, ethanol, and deionized water, and dried at -50 ℃ for 24 h to obtain the functional filler. The mass ratio of hemp fiber, N,N-dimethylformamide, alkaline catalyst, and activated and modified copper oxide quantum dots was 5:50:1:2. The length of the hemp fiber was 5 mm. The alkaline catalyst was potassium carbonate. (2) Cerium nitrate and deionized water are mixed and stirred at 100 rpm for 30 min. The pH of the solution is adjusted to 9 with sodium hydroxide solution. Polyvinylpyrrolidone, functional filler, and ceramic microspheres are added and stirred for another 30 min. The mixture is then heated to react at 70°C for 4 h and then at 150°C for 9 h. Methyl methacrylate and its initiator are then added and polymerized by stirring at 200 rpm at 70°C for 8 h to obtain a heat-insulating and antibacterial coating. The mass ratio of cerium nitrate, deionized water, polyvinylpyrrolidone, functional filler, methyl methacrylate, initiator, and ceramic microspheres is 1.5:10:0.6:3:20:0.2:3. The initiator is benzoyl peroxide. (3) Apply the heat-insulating and antibacterial coating to the steel plate with a wet film thickness of 40 μm. After heat curing, raise the temperature to 80°C at 2°C / min and keep it at that temperature for 10 minutes. Then raise the temperature to 130°C and keep it at that temperature for 1 hour. Next, lower the temperature to 60°C at 5°C / min and let it cool naturally to room temperature.
[0023] Example 3 (1) Calcine copper oxide quantum dots at 700℃ for 1.5h, then impregnate them in 1wt% nitric acid solution at a bath ratio of 1:50, stir at 60℃ and 300rpm for 2h, then wash them three times with deionized water, place them in a mixed solution of ethanol and deionized water with a volume ratio of ethanol to deionized water of 3:1, add citric acid, sonicate at 21kHz for 30min, stir at 60℃ and 500rpm for 6h, then wash them three times each with ethanol and deionized water, and dry them at -50℃ for 24h to obtain activated and modified copper oxide quantum dots; the mass ratio of copper oxide quantum dots, mixed solution and citric acid is 1:40:5; disperse hemp fibers in N, N In N,N-dimethylformamide, an alkaline catalyst was added after sonication at 21 kHz for 30 min, and the mixture was stirred at 300 rpm until dissolved. Then, activated and modified copper oxide quantum dots were added. The mixture was first placed in an oil bath at 70 ℃ for 15 h, and then the reaction was assisted by ultrasonication at a frequency of 40 kHz for 30 min. Finally, the mixture was washed three times each with N,N-dimethylformamide, ethanol, and deionized water, and dried at -50 ℃ for 24 h to obtain the functional filler. The mass ratio of hemp fiber, N,N-dimethylformamide, alkaline catalyst, and activated and modified copper oxide quantum dots was 5:70:1:3. The length of the hemp fiber was 5 mm. The alkaline catalyst was potassium carbonate. (2) Cerium nitrate and deionized water are mixed and stirred at 100 rpm for 30 min. The pH of the solution is adjusted to 9 with sodium hydroxide solution. Polyvinylpyrrolidone, functional filler, and ceramic microspheres are added and stirred for another 30 min. Then, the mixture is heated to react at 70°C for 4 h and then at 170°C for 12 h. Methyl methacrylate and its initiator are then added and polymerized by stirring at 200 rpm at 80°C for 8 h to obtain a heat-insulating and antibacterial coating. The mass ratio of cerium nitrate, deionized water, polyvinylpyrrolidone, functional filler, methyl methacrylate, initiator, and ceramic microspheres is 1.5:10:0.6:3:20:0.2:3. The initiator is benzoyl peroxide. (3) Apply the heat-insulating and antibacterial coating to the steel plate with a wet film thickness of 40 μm. After heat curing, raise the temperature to 80°C at 2°C / min and keep it at that temperature for 10 minutes. Then raise the temperature to 130°C and keep it at that temperature for 1 hour. Next, lower the temperature to 60°C at 5°C / min and let it cool naturally to room temperature.
[0024] Example 4 (1) Calcine copper oxide quantum dots at 700℃ for 1.5h, then impregnate them in 1wt% nitric acid solution at a bath ratio of 1:30, stir at 60℃ and 300rpm for 2h, then wash them three times with deionized water, place them in a mixed solution of ethanol and deionized water with a volume ratio of ethanol to deionized water of 3:1, add citric acid, sonicate at 21kHz for 30min, stir at 60℃ and 500rpm for 6h, then wash them three times each with ethanol and deionized water, and dry them at -50℃ for 24h to obtain activated and modified copper oxide quantum dots; the mass ratio of copper oxide quantum dots, mixed solution and citric acid is 1:40:5; disperse hemp fibers in N, N In N,N-dimethylformamide, an alkaline catalyst was added after ultrasonication at 21 kHz for 30 min, and the mixture was stirred at 300 rpm until dissolved. Then, activated and modified copper oxide quantum dots were added. The mixture was first placed in an oil bath at 70 ℃ for 12 h, and then the reaction was assisted by ultrasonication at a frequency of 40 kHz for 30 min. Finally, the mixture was washed three times each with N,N-dimethylformamide, ethanol, and deionized water, and dried at -50 ℃ for 24 h to obtain the functional filler. The mass ratio of hemp fiber, N,N-dimethylformamide, alkaline catalyst, and activated and modified copper oxide quantum dots was 5:50:1:2. The length of the hemp fiber was 5 mm. The alkaline catalyst was potassium carbonate. (2) Cerium nitrate and deionized water are mixed and stirred at 100 rpm for 30 min. The pH of the solution is adjusted to 9 with sodium hydroxide solution. Polyvinylpyrrolidone, functional filler, and ceramic microspheres are added and stirred for another 30 min. The mixture is then heated to react at 70°C for 4 h and then at 150°C for 9 h. Methyl methacrylate and its initiator are then added and polymerized by stirring at 200 rpm at 70°C for 8 h to obtain a heat-insulating and antibacterial coating. The mass ratio of cerium nitrate, deionized water, polyvinylpyrrolidone, functional filler, methyl methacrylate, initiator, and ceramic microspheres is 1.5:10:0.6:1:20:0.2:3. The initiator is benzoyl peroxide. (3) Apply the heat-insulating and antibacterial coating to the steel plate with a wet film thickness of 40 μm. After heat curing, raise the temperature to 80°C at 2°C / min and keep it at that temperature for 10 minutes. Then raise the temperature to 130°C and keep it at that temperature for 1 hour. Next, lower the temperature to 60°C at 5°C / min and let it cool naturally to room temperature.
[0025] Example 5 (1) Calcine copper oxide quantum dots at 700℃ for 1.5h, then impregnate them in 1wt% nitric acid solution at a bath ratio of 1:30, stir at 60℃ and 300rpm for 2h, then wash them three times with deionized water, place them in a mixed solution of ethanol and deionized water with a volume ratio of ethanol to deionized water of 3:1, add citric acid, sonicate at 21kHz for 30min, stir at 60℃ and 500rpm for 6h, then wash them three times each with ethanol and deionized water, and dry them at -50℃ for 24h to obtain activated and modified copper oxide quantum dots; the mass ratio of copper oxide quantum dots, mixed solution and citric acid is 1:40:5; disperse hemp fibers in N, N In N,N-dimethylformamide, an alkaline catalyst was added after ultrasonication at 21 kHz for 30 min, and the mixture was stirred at 300 rpm until dissolved. Then, activated and modified copper oxide quantum dots were added. The mixture was first placed in an oil bath at 70 ℃ for 12 h, and then the reaction was assisted by ultrasonication at a frequency of 40 kHz for 30 min. Finally, the mixture was washed three times each with N,N-dimethylformamide, ethanol, and deionized water, and dried at -50 ℃ for 24 h to obtain the functional filler. The mass ratio of hemp fiber, N,N-dimethylformamide, alkaline catalyst, and activated and modified copper oxide quantum dots was 5:50:1:2. The length of the hemp fiber was 5 mm. The alkaline catalyst was potassium carbonate. (2) Cerium nitrate and deionized water are mixed and stirred at 100 rpm for 30 min. The pH of the solution is adjusted to 9 with sodium hydroxide solution. Polyvinylpyrrolidone, functional filler, and ceramic microspheres are added and stirred for another 30 min. Then, the mixture is heated to react at 70°C for 4 h and then at 150°C for 9 h. Methyl methacrylate and its initiator are then added and polymerized by stirring at 200 rpm at 70°C for 8 h to obtain a heat-insulating and antibacterial coating. The mass ratio of cerium nitrate, deionized water, polyvinylpyrrolidone, functional filler, methyl methacrylate, initiator, and ceramic microspheres is 0.5:10:0.6:3:20:0.2:3. The initiator is benzoyl peroxide. (3) Apply the heat-insulating and antibacterial coating to the steel plate with a wet film thickness of 40 μm. After heat curing, raise the temperature to 80°C at 2°C / min and keep it at that temperature for 10 minutes. Then raise the temperature to 130°C and keep it at that temperature for 1 hour. Next, lower the temperature to 60°C at 5°C / min and let it cool naturally to room temperature.
[0026] Comparative Example 1 The difference between Comparative Example 1 and Example 2 lies in step (1). Step (1) is changed to: dispersing hemp fibers in N,N-dimethylformamide, sonicating at 21 kHz for 30 min, adding an alkaline catalyst, stirring at 300 rpm until dissolved, continuing sonication for 30 min, then washing with ethanol and deionized water three times each, and drying at -50℃ for 24 h to obtain the functional filler; the mass ratio of hemp fibers, N,N-dimethylformamide, and alkaline catalyst is 5:50:1; the length of the hemp fibers is 5 mm; the alkaline catalyst is potassium carbonate; the remaining steps are the same as in Example 2.
[0027] Comparative Example 2 The difference between Comparative Example 2 and Example 2 is that no functional filler is added; the remaining steps are the same as in Example 2.
[0028] Comparative Example 3 The difference between Comparative Example 3 and Example 2 is that step (2) is different. Step (2) is changed to: the functional filler, methyl methacrylate and its initiator are polymerized by stirring at 200 rpm, the temperature is 70°C and the time is 8h to obtain a heat-insulating and antibacterial coating; the mass ratio of the functional filler, methyl methacrylate and initiator is 3:20:0.2; the initiator is benzoyl peroxide; the remaining steps are the same as in Example 2.
[0029] Example of effect Table 1 below shows the performance analysis results of the heat-insulating and antibacterial steel plates of Examples 1 to 5 and Comparative Examples 1 to 3 of the present invention.
[0030] Table 1
[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.
Claims
1. A heat-insulating and antibacterial steel plate, characterized in that, The preparation steps include the following: (1) Hemp fiber was dispersed in N,N-dimethylformamide, sonicated, and then an alkaline catalyst was added and stirred to dissolve. Then activated and modified copper oxide quantum dots were added. The mixture was first placed in an oil bath for reaction, and then the reaction was assisted by ultrasonic process. Finally, it was washed with N,N-dimethylformamide, ethanol and deionized water in sequence, and then freeze-dried to obtain functional filler. (2) Mix cerium nitrate and deionized water, stir well, adjust the pH of the solution to 9 with sodium hydroxide solution, add polyvinylpyrrolidone, functional filler and ceramic microspheres, stir first, then heat to react, and then add methyl methacrylate and its initiator, and polymerize by stirring to obtain heat insulation and antibacterial coating. (3) Apply the heat-insulating and antibacterial coating to the steel plate with a wet film thickness of 40 μm. After heat curing, raise the temperature to 80°C at 2°C / min and keep it at that temperature for 10 minutes. Then raise the temperature to 130°C and keep it at that temperature for 1 hour. Next, lower the temperature to 60°C at 5°C / min and let it cool naturally to room temperature.
2. The heat-insulating and antibacterial steel plate according to claim 1, characterized in that, The mass ratio of hemp fiber, N,N-dimethylformamide, alkaline catalyst, and activated modified copper oxide quantum dots in step (1) is 5:30-70:1:1-3.
3. The heat-insulating and antibacterial steel plate according to claim 1, characterized in that, The alkaline catalyst in step (1) is potassium carbonate.
4. The heat-insulating and antibacterial steel plate according to claim 1, characterized in that, The preparation method of activated and modified copper oxide quantum dots in step (1) is as follows: calcining copper oxide quantum dots at 700℃ for 1.5h, then immersing them in 1wt% nitric acid solution at a bath ratio of 1:10-50, stirring at 60℃ and 300rpm for 2h, then washing them three times with deionized water, placing them in a mixed solution of ethanol and deionized water with a volume ratio of ethanol to deionized water of 3:1, adding citric acid, sonicating at 21kHz for 30min, stirring at 60℃ and 500rpm for 6h, then washing them three times each with ethanol and deionized water, and drying them at -50℃ for 24h to obtain the product; the mass ratio of copper oxide quantum dots, mixed solution, and citric acid is 1:40:
5.
5. The heat-insulating and antibacterial steel plate according to claim 1, characterized in that, The process parameters for the ultrasonic-assisted reaction in step (1) are: ultrasonic frequency of 40 kHz and time of 30 min.
6. The heat-insulating and antibacterial steel plate according to claim 1, characterized in that, The mass ratio of cerium nitrate, deionized water, polyvinylpyrrolidone, functional filler, methyl methacrylate, initiator, and ceramic microspheres in step (2) is 1.5:10:0.6:3:20:0.2:
3.
7. The heat-insulating and antibacterial steel plate according to claim 1, characterized in that, The initiator in step (2) is benzoyl peroxide.
8. The heat-insulating and antibacterial steel plate according to claim 1, characterized in that, The specific steps of the heating reaction described in step (2) are as follows: first react at 70℃ for 4 hours, then react at 110-170℃ for 5-12 hours.
9. The heat-insulating and antibacterial steel plate according to claim 1, characterized in that, The polymerization in step (2) is carried out at a temperature of 60-80℃ for 8 hours.