Rare earth antibacterial mildew-proof formaldehyde-removing metal plate
By integrating nano-sized rare earth elements and auxiliary components into the coating of metal decorative panels, endogenous antibacterial, antifungal, and formaldehyde-removing functions are formed, solving the problems of single function, poor durability, and insufficient environmental adaptability in existing technologies, and achieving long-lasting and stable health functions.
Patent Information
- Application Number
- CN202511741568.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-02-24
AI Technical Summary
Existing metal decorative panels suffer from limitations in antibacterial and purification functions, including limited functionality, poor durability, insufficient environmental adaptability, and poor process compatibility. As a result, it is difficult to achieve long-term and stable health benefits while maintaining the original performance.
Rare earth elements are integrated with components such as nano-titanium dioxide and diatomaceous earth into a functional coating. The coating is cured at high temperature to form a thickness of 20-80 micrometers. The rare earth elements are nano-sized and work synergistically with auxiliary components to form endogenous antibacterial, antifungal and formaldehyde-removing effects. An anti-settling agent is added to the coating to ensure stability.
It achieves uniform dispersion of rare earth elements in the coating, ensuring long-term stability of antibacterial, antifungal, and formaldehyde-purifying effects, enhancing the contact efficiency and environmental adaptability of functional components, and overcoming the limitations of traditional technologies.
Abstract
Description
Technical Field
[0001] This invention belongs to the field of building decorative panel technology, specifically relating to a rare earth antibacterial, mildew-proof, and formaldehyde-removing metal panel. Background Technology
[0002] Metal decorative panels, as an important material in the field of architectural decoration, mainly include aluminum and steel plates. Due to their high strength, light weight, good fire resistance, and rich decorative effects, they are widely used in the exterior curtain walls, interior wall decoration, and ceiling systems of various buildings. Currently, high-end metal decorative panel products on the market mostly use fluorocarbon spraying or baking paint processes for surface treatment. These processes enable the metal panels to achieve excellent weather resistance, corrosion resistance, and a variety of color options.
[0003] However, as people's demands for indoor environmental health continue to increase, the functional limitations of traditional metal decorative panels are gradually becoming apparent. These traditional products mainly focus on physical protection and aesthetic decoration, lacking the ability to proactively improve indoor environmental quality. In modern buildings, due to their strong airtightness, indoor air pollution problems are becoming increasingly prominent, including the spread of microorganisms such as bacteria and mold, and the continuous release of volatile organic compounds such as formaldehyde from furniture and decoration materials. These pollutants pose a serious threat to human health.
[0004] To address these issues, existing technologies have undergone several attempts and improvements. Some solutions impart antibacterial properties to materials by coating the metal plate surface with an antibacterial coating. While this method achieves antibacterial effects to some extent, the functional layer, being located on the material surface, is prone to failure due to wear and scratches during daily use, resulting in a short lifespan. Other technologies employ physical adsorption methods, such as adding adsorbent substances to the material to remove formaldehyde. However, this method suffers from adsorption saturation; once saturated, it loses its purification function and may even become a secondary source of pollution. Some research draws on photocatalysis principles, introducing photocatalytic components onto the material surface to decompose formaldehyde. However, these methods require ultraviolet light excitation to function, and their efficiency drops significantly in low-light indoor environments, greatly limiting their practical application.
[0005] In summary, while existing technologies have made some progress in endowing metal decorative panels with antibacterial and purifying functions, several key issues remain to be addressed. First, there is the issue of functional limitation; most solutions can only achieve a single function and cannot simultaneously address both microbial and chemical contamination. Second, there is the issue of functional durability; surface treatment methods are prone to functional failure due to wear. Third, there is the issue of environmental adaptability; some technologies have specific requirements for the operating environment, such as low efficiency under indoor lighting conditions. Finally, there is the issue of process compatibility; many functional solutions are difficult to effectively integrate with existing mature metal panel production processes, increasing the difficulty and cost of industrial implementation. These problems necessitate the development of a new type of multifunctional metal decorative panel that can achieve long-lasting, stable, and environmentally adaptable health functions while maintaining its original performance. Therefore, a rare-earth antibacterial, mildew-proof, and formaldehyde-removing metal panel needs to be designed. Summary of the Invention
[0006] To overcome the shortcomings of existing technologies, a rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate is provided.
[0007] To achieve the above objectives, the present invention provides the following technical solution:
[0008] A rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate, the metal plate comprising a metal substrate and a functional coating compounded on at least one surface of the metal substrate, the functional coating being formed by high-temperature curing of a coating containing rare earth elements, wherein the mass percentage of the rare earth elements in the functional coating is 5% to 8.5%.
[0009] The coating is at least one of fluorocarbon coating, polyester varnish, or epoxy resin coating.
[0010] The high-temperature curing process conditions are baking at 180-250℃ for 5-30 minutes, the thickness of the functional coating is 20-80 micrometers, and the metal substrate is one of steel plate, aluminum plate, aluminum alloy plate or galvanized steel plate, with a thickness of 0.3-2.0 mm.
[0011] The rare earth element is at least one of the oxides or inorganic salts of cerium, lanthanum, and yttrium.
[0012] The rare earth element powder is nano-sized before use, so that its particle size is 50-500 nanometers.
[0013] The nano-sizing process employs mechanical ball milling with a ball-to-material mass ratio of 10:1 to 20:1, a milling time of 2 to 6 hours, and a ball mill speed of 200 to 400 rpm.
[0014] The functional coating also includes auxiliary functional components, including nano-titanium dioxide and diatomaceous earth. The nano-titanium dioxide accounts for 1% to 3% of the mass percentage of the functional coating, and the diatomaceous earth accounts for 2% to 5% of the mass percentage of the functional coating.
[0015] The nano-titanium dioxide has an anatase crystal form, a particle size range of 20-50 nanometers, and a specific surface area of 35-65 square meters per gram.
[0016] The diatomaceous earth is acidified to a pH of 5.5-6.5, with a pore size distribution of 2-10 nanometers and a pore volume of not less than 0.8 ml / g.
[0017] The functional coating also includes an anti-settling agent, which is one of organobentonite or hydrogenated castor oil, and the anti-settling agent accounts for 0.2% to 0.6% of the functional coating by mass.
[0018] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:
[0019] 1. This invention achieves endogenous and durable functionality by directly integrating rare earth elements into the functional coating. Because the rare earth elements are uniformly dispersed throughout the entire coating system, rather than merely existing on the surface, even if surface wear occurs during use, the newly exposed coating surface can continuously release functional rare earth ions, thus ensuring the long-term stability of the antibacterial, antifungal, and formaldehyde-purifying effects.
[0020] 2. In this invention, the rare earth elements used undergo nano-sizing to achieve a specific particle size range. This treatment significantly improves the dispersibility and specific surface area of the rare earth elements in the coating system. The nano-sized rare earth particles can more fully integrate with the coating matrix and are firmly fixed within the formed paint film network during high-temperature curing. This not only enhances the contact efficiency between functional components and contaminants but also avoids performance degradation caused by particle agglomeration.
[0021] 3. The introduction of auxiliary functional components such as nano-titanium dioxide and diatomaceous earth into the functional coating produced a significant synergistic effect with rare earth elements. The anatase crystal structure of nano-titanium dioxide has excellent photocatalytic properties, which can complement the non-photocatalytic mechanism of rare earth elements. Meanwhile, the acidified diatomaceous earth, with its rich porous structure, can enhance the adsorption capacity of formaldehyde molecules and provide more active sites for rare earth catalytic reactions.
[0022] 4. This invention effectively improves the storage stability of functional coatings before application by adding an appropriate amount of anti-settling agent. The anti-settling agent forms a stable three-dimensional network structure in the coating system, preventing the sedimentation and stratification of denser rare earth elements and auxiliary functional components. This ensures the uniformity of the coating during application, thereby ensuring the consistency of the final product's functional performance.
[0023] 5. The rare earth elements of this invention possess a unique electronic layer structure, enabling them to activate oxygen molecules in the air at room temperature and pressure, directly oxidizing and decomposing formaldehyde molecules adsorbed on the coating surface. This catalytic process does not rely on ultraviolet irradiation, allowing the product to maintain high purification efficiency even in environments with insufficient indoor lighting, overcoming the limitations of traditional photocatalytic materials in indoor applications. Detailed Implementation
[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.
[0025] The technical solution of this application is as follows:
[0026] A rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate, the metal plate comprising a metal substrate and a functional coating compounded on at least one surface of the metal substrate, the functional coating being formed by high-temperature curing of a coating containing rare earth elements, wherein the mass percentage of the rare earth elements in the functional coating is 5% to 8.5%.
[0027] The coating is at least one of fluorocarbon coating, polyester varnish, or epoxy resin coating.
[0028] The high-temperature curing process conditions are baking at 180-250℃ for 5-30 minutes, the thickness of the functional coating is 20-80 micrometers, and the metal substrate is one of steel plate, aluminum plate, aluminum alloy plate or galvanized steel plate, with a thickness of 0.3-2.0 mm.
[0029] The rare earth element is at least one of the oxides or inorganic salts of cerium, lanthanum, and yttrium.
[0030] The rare earth element powder is nano-sized before use, so that its particle size is 50-500 nanometers.
[0031] The nano-sizing process employs mechanical ball milling with a ball-to-material mass ratio of 10:1 to 20:1, a milling time of 2 to 6 hours, and a ball mill speed of 200 to 400 rpm.
[0032] The functional coating also includes auxiliary functional components, including nano-titanium dioxide and diatomaceous earth. The nano-titanium dioxide accounts for 1% to 3% of the mass percentage of the functional coating, and the diatomaceous earth accounts for 2% to 5% of the mass percentage of the functional coating.
[0033] The nano-titanium dioxide has an anatase crystal form, a particle size range of 20-50 nanometers, and a specific surface area of 35-65 square meters per gram.
[0034] The diatomaceous earth is acidified to a pH of 5.5-6.5, with a pore size distribution of 2-10 nanometers and a pore volume of not less than 0.8 ml / g.
[0035] The functional coating also includes an anti-settling agent, which is one of organobentonite or hydrogenated castor oil, and the anti-settling agent accounts for 0.2% to 0.6% of the functional coating by mass.
[0036] The present invention will be described in detail below through examples and comparative examples, but the scope of protection of the present invention is not limited to these examples. Unless otherwise specified, the chemical reagents and raw materials used in the following examples and comparative examples are all conventional commercially available products.
[0037] Example 1
[0038] A rare-earth antibacterial, mildew-resistant, and formaldehyde-removing metal plate is disclosed. The metal plate comprises a metal substrate and a functional coating laminated to one surface of the metal substrate. The metal substrate is an aluminum alloy plate with a thickness of 1.15 mm. The functional coating is formed by high-temperature curing of a fluorocarbon coating containing rare-earth elements. The rare-earth elements in the functional coating constitute 8.5% by mass. The rare-earth elements are cerium oxides, which undergo nano-sizing treatment to achieve a particle size of 50 nm before use. The nano-sizing treatment is performed using mechanical ball milling with a ball-to-material mass ratio of 20:1, a milling time of 4 hours, and a ball mill speed of 200 rpm. The functional coating also contains auxiliary functional components: nano-titanium dioxide constitutes 3% by mass, and diatomaceous earth constitutes 3.5% by mass. The nano-titanium dioxide has an anatase crystal form, a particle size of 20 nm, and a specific surface area of 65 m² / g. The diatomaceous earth is acidified to a pH of 6.0, with a pore size distribution mainly of 2-10 nm and a pore volume of 0.8 mL / g. The functional coating also includes an anti-settling agent, which is organic bentonite, accounting for 0.2% by mass in the functional coating. During preparation, the metal substrate undergoes degreasing and chemical conversion pretreatment. Rare earth elements are mixed with fluorocarbon coating and stirred evenly using a high-speed dispersion device. The mixture is then applied to the substrate surface using an electrostatic spraying process, with the wet film thickness controlled. Finally, it is baked at 215°C for 5 minutes for high-temperature curing to form a functional coating with a thickness of 80 micrometers.
[0039] Example 2
[0040] In this embodiment, the similarities to those in Embodiment 1 will not be repeated, and the differences are as follows:
[0041] A rare-earth antibacterial, mildew-proof, and formaldehyde-removing metal plate includes a metal substrate and a functional coating laminated to one surface of the metal substrate. The metal substrate is a 2.0 mm thick galvanized steel plate. The functional coating is formed by high-temperature curing of a polyester paint containing rare-earth elements. The rare-earth element in the functional coating is 5% by mass; it is an inorganic salt of lanthanum, which undergoes nano-sizing treatment to achieve a particle size of 275 nm before use. The nano-sizing treatment is performed using mechanical ball milling with a ball-to-material mass ratio of 10:1, a milling time of 6 hours, and a mill speed of 300 rpm. The functional coating also contains auxiliary functional components: nano-titanium dioxide accounts for 1% by mass, and diatomaceous earth accounts for 5% by mass. The nano-titanium dioxide has an anatase crystal form, a particle size of 35 nm, and a specific surface area of 35 m² / g. The diatomaceous earth is acidified to a pH of 6.5, with a pore size distribution mainly of 2-10 nm and a pore volume of 0.8 mL / g. The functional coating also includes an anti-settling agent, which is hydrogenated castor oil, accounting for 0.4% by mass in the functional coating. During preparation, the metal substrate undergoes degreasing and chemical conversion pretreatment. Rare earth elements are mixed with polyester paint and stirred evenly using a high-speed dispersion device. The mixture is then applied to the substrate surface using a roller coating process, with the wet film thickness controlled. Finally, it is baked at 250°C for 17.5 minutes for high-temperature curing to form a functional coating with a thickness of 20 micrometers.
[0042] Example 3
[0043] In this embodiment, the similarities to those in Embodiment 1 will not be repeated, and the differences are as follows:
[0044] A rare-earth antibacterial, mildew-resistant, and formaldehyde-removing metal plate is disclosed. The metal plate comprises a metal substrate and a functional coating laminated to one surface of the metal substrate. The metal substrate is an aluminum plate with a thickness of 0.3 mm. The functional coating is formed by high-temperature curing of an epoxy resin coating containing rare-earth elements. The rare-earth elements in the functional coating constitute 6.75% by mass. The rare-earth elements are yttrium oxides, which undergo nano-sizing treatment to achieve a particle size of 500 nm before use. The nano-sizing treatment is performed using mechanical ball milling with a ball-to-material mass ratio of 15:1, a milling time of 2 hours, and a ball mill speed of 400 rpm. The functional coating also contains auxiliary functional components: nano-titanium dioxide and diatomaceous earth constitute 2% by mass. The nano-titanium dioxide has an anatase crystal form, a particle size of 50 nm, and a specific surface area of 50 m² / g. The diatomaceous earth is acidified to a pH of 5.5, with a pore size distribution mainly of 2-10 nm and a pore volume of 0.8 mL / g. The functional coating also includes an anti-settling agent, which is organic bentonite, accounting for 0.6% by mass in the functional coating. During preparation, the metal substrate undergoes degreasing and chemical conversion pretreatment. Rare earth elements are mixed with epoxy resin coating and stirred evenly using a high-speed dispersion device. The mixture is then applied to the substrate surface using a baking process, with the wet film thickness controlled. Finally, it is baked at 180°C for 30 minutes for high-temperature curing to form a functional coating with a thickness of 50 micrometers.
[0045] Comparative Example 1
[0046] In this comparative example, the similarities with Example 1 will not be repeated, and the differences are as follows:
[0047] The mass percentage of rare earth elements in the functional coating is 0%, meaning that no rare earth elements are added.
[0048] Comparative Example 2
[0049] In this comparative example, the similarities with Example 1 will not be repeated, and the differences are as follows:
[0050] Rare earth elements were not nano-sized; ordinary micron-sized cerium oxide powder with a particle size of approximately 5 micrometers was used.
[0051] Comparative Example 3
[0052] In this comparative example, the similarities with Example 1 will not be repeated, and the differences are as follows:
[0053] No auxiliary functional components, that is, no nano titanium dioxide and diatomaceous earth are added.
[0054] Comparative Example 4
[0055] In this comparative example, the similarities with Example 1 will not be repeated, and the differences are as follows:
[0056] No anti-settling agent.
[0057] Comparative Example 5
[0058] In this comparative example, the similarities with Example 1 will not be repeated, and the differences are as follows:
[0059] The high-temperature curing conditions were changed to baking at 150℃ for 5 minutes, which is lower than the specified range.
[0060] Performance Test Results and Analysis
[0061] Metal plates were obtained according to the parameters of the examples and comparative examples, and their performance was evaluated using common industry standard methods. Antibacterial performance testing was conducted according to GB / T 21866-2008 standard, using *Escherichia coli* and *Staphylococcus aureus* as test strains, and the 24-hour antibacterial rate was calculated. Mildew resistance testing was conducted according to GB / T 1741-2007 standard, evaluating the mildew resistance level, with level 0 indicating no mildew growth and level 4 indicating severe mildew growth. Formaldehyde purification efficiency testing was conducted according to JC / T 1074-2008 standard, with an initial formaldehyde concentration of 1.0 ± 0.1 mg / m³ in a sealed chamber, and the purification efficiency was measured after 24 hours. Physical performance tests included adhesion testing according to GB / T 9286-1998 standard, evaluating the coating adhesion grade, with grade 0 being the best and grade 5 the worst; and abrasion resistance testing according to GB / T1768-2006 standard, where 500 grams of pressure was applied with 0000# steel wool, and the coating was observed and evaluated after 1000 cycles of reciprocating rubbing. The specific test results are shown in Table 1.
[0062] As shown in Table 1, all embodiments exhibit excellent overall performance, with an antibacterial rate exceeding 98%, a mildew resistance rating of 0, and a formaldehyde purification efficiency exceeding 85%, while also demonstrating good adhesion and abrasion resistance. This verifies the intrinsic and durable functionality mentioned in the beneficial effects of this invention. Because the rare earth elements are uniformly dispersed within the coating, even if surface wear occurs during use, the newly exposed coating surface can still continuously release functional rare earth ions, thereby ensuring the long-term stability of the antibacterial, mildew-proof, and formaldehyde-purifying effects.
[0063] Table 1 Analysis of Test Results
[0064] sample Escherichia coli antibacterial rate (%) Staphylococcus aureus antibacterial rate (%) Anti-mildew rating Formaldehyde purification efficiency (%) Adhesion (Grade) abrasion resistance Example 1 99.5 99.3 0 88 0 No change Example 2 98.8 99.0 0 85 0 No change Example 3 99.2 99.1 0 86 0 No change Comparative Example 1 10.2 12.5 3 5 1 Slight wear Comparative Example 2 80.5 78.0 1 55 1 Slight wear Comparative Example 3 85.0 83.0 2 60 0 No change Comparative Example 4 95.0 94.0 0 80 0 No change Comparative Example 5 90.0 88.0 1 70 2 Partial detachment
[0065] Test results show that Comparative Example 1, lacking rare earth elements, exhibits significantly reduced antibacterial and formaldehyde-removing properties, and also has a poorer anti-mildew rating. This confirms that rare earth elements are the core components for achieving health functions, contrasting with the limited functionality of traditional metal plates mentioned in the background section. Comparative Example 2, without rare earth element nano-sizing, shows significantly lower performance than the examples, indicating that nano-sizing improves the dispersibility and specific surface area of rare earth elements in the coating system, enhances the contact efficiency between functional components and pollutants, and avoids performance degradation due to particle agglomeration. This aligns with the description of nano-sizing in the beneficial effects section. Comparative Example 3, lacking auxiliary functional components, shows reduced performance, indicating a synergistic effect between nano-titanium dioxide and diatomaceous earth with rare earth elements. The anatase crystal structure of nano-titanium dioxide possesses excellent photocatalytic properties, complementing the non-photocatalytic mechanism of rare earth elements. Meanwhile, the abundant porous structure of diatomaceous earth enhances formaldehyde adsorption capacity and provides more active sites for catalytic reactions. Comparative Example 4, without an anti-settling agent, showed sedimentation during storage, but its performance remained acceptable after application. This indicates that the anti-settling agent, by forming a stable three-dimensional network structure, ensured the uniformity of the coating before application, thereby guaranteeing the consistency of the product's functional performance. Comparative Example 5, with insufficient curing temperature, experienced a decline in performance, demonstrating that high-temperature curing is crucial for the formation of functional coatings. Low temperatures lead to insufficient cross-linking of the coating, affecting its functionality and physical properties.
[0066] While maintaining the original performance of metal decorative panels, this invention achieves long-lasting, stable and environmentally adaptable health functions through the optimized integration of rare earth elements and auxiliary components, overcoming the problems of single function, poor durability and dependence on light in existing technologies.
[0067] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate, characterized in that, The metal plate includes a metal substrate and a functional coating compounded on at least one surface of the metal substrate. The functional coating is formed by high-temperature curing of a coating containing rare earth elements, wherein the mass percentage of the rare earth elements in the functional coating is 5% to 8.5%.
2. The rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate according to claim 1, characterized in that, The coating is at least one of fluorocarbon coating, polyester varnish, or epoxy resin coating.
3. The rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate according to claim 1, characterized in that, The high-temperature curing process conditions are baking at 180-250℃ for 5-30 minutes, the thickness of the functional coating is 20-80 micrometers, and the metal substrate is one of steel plate, aluminum plate, aluminum alloy plate or galvanized steel plate, with a thickness of 0.3-2.0 mm.
4. The rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate according to claim 1, characterized in that, The rare earth element is at least one of the oxides or inorganic salts of cerium, lanthanum, and yttrium.
5. The rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate according to claim 4, characterized in that, The rare earth element powder is nano-sized before use, so that its particle size is 50-500 nanometers.
6. The rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate according to claim 5, characterized in that, The nano-sizing process employs mechanical ball milling with a ball-to-material mass ratio of 10:1 to 20:1, a milling time of 2 to 6 hours, and a ball mill speed of 200 to 400 rpm.
7. The rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate according to claim 1, characterized in that, The functional coating also includes auxiliary functional components, including nano-titanium dioxide and diatomaceous earth. The nano-titanium dioxide accounts for 1% to 3% of the mass percentage of the functional coating, and the diatomaceous earth accounts for 2% to 5% of the mass percentage of the functional coating.
8. The rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate according to claim 7, characterized in that, The nano-titanium dioxide has an anatase crystal form, a particle size range of 20-50 nanometers, and a specific surface area of 35-65 square meters per gram.
9. A rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate according to claim 7, characterized in that, The diatomaceous earth is acidified to a pH of 5.5-6.5, with a pore size distribution of 2-10 nanometers and a pore volume of not less than 0.8 ml / g.
10. A rare earth antibacterial, mildew-proof, and formaldehyde-removing metal plate according to claim 1, characterized in that, The functional coating also includes an anti-settling agent, which is one of organobentonite or hydrogenated castor oil, and the anti-settling agent accounts for 0.2% to 0.6% of the functional coating by mass.