A heat resistant easy-to-clean ceramic coating

Abstract

The utility model discloses a kind of heat-resistant easy-to-clean ceramic coating, it relates to the field of functional coating, including substrate, further including permeation combination layer, permeation combination layer is located substrate surface, functional layer is located the surface of permeation combination layer far from substrate side;This kind of heat-resistant easy-to-clean ceramic coating can realize the high-strength combination of coating and substrate, while having high-temperature resistance, high wear resistance, long-acting non-stick and antibacterial function.

Description

Technical Field

[0001] This utility model relates to the field of functional coatings, specifically a heat-resistant and easy-to-clean ceramic coating. Background Technology

[0002] With increasing awareness of environmental protection and health, traditional polymer non-stick coatings such as polytetrafluoroethylene are gradually being replaced by ceramic coatings because they may release harmful substances at high temperatures.

[0003] However, existing ceramic coatings mostly rely on physical adsorption and simple mechanical bonding, which are prone to peeling off under high temperature or long-term friction, especially on smooth substrates such as ceramic and stainless steel surfaces. In order to improve the bonding force, some coatings add polymer adhesives, which leads to a decrease in temperature resistance, and the non-stick properties and hydrophobic and oleophobic properties deteriorate rapidly with the use time, making it difficult to meet the needs of food contact, sanitary ware and other scenarios. Utility Model Content

[0004] The purpose of this invention is to provide a heat-resistant and easy-to-clean ceramic coating that achieves a high-strength bond between the coating and the substrate, while also possessing high temperature resistance, high wear resistance, long-lasting non-stick properties, and antibacterial functions.

[0005] The above-mentioned optimized structure of this utility model is achieved through the following technical solution: a heat-resistant and easy-to-clean ceramic coating, including a substrate and a penetration bonding layer, wherein the penetration bonding layer is disposed on the surface of the substrate; A functional layer is disposed on the surface of the penetration bonding layer away from the substrate.

[0006] In some embodiments, a bonding reinforcement component is further included, the bonding reinforcement component being disposed between the substrate and the penetration bonding layer.

[0007] In some embodiments, the bonding reinforcement component includes a connection hole disposed on the surface of the substrate near the penetration bonding layer; A connecting hook is disposed on the surface of the penetrating bonding layer near the substrate and anchored in the connecting hole.

[0008] In some embodiments, the permeation bonding layer and the connecting hook are both mixtures of nano-silica sol and ceramic micro powder.

[0009] In some embodiments, the ceramic micro powder is a nanoscale powder homogeneous with the substrate, with a particle size of 0.3-1 μm.

[0010] In some embodiments, the functional layer is a mixture of nano-zirconia, nano-titanium dioxide, and inorganic silicone resin.

[0011] In some embodiments, the nano-zirconia has a particle size of 20-50 nm, and the nano-titanium dioxide is anatase with a particle size of 10-30 nm.

[0012] In some embodiments, 0.5%-1% of a fluorosilane coupling agent is also added to the functional layer.

[0013] In some embodiments, the fluorosilane coupling agent is tridecafluorooctyltriethoxysilane.

[0014] In summary, this utility model has the following beneficial effects: This heat-resistant and easy-to-clean ceramic coating uses a penetrating bonding layer, in which the silanol groups can undergo a condensation reaction with the surface hydroxyl groups of the substrate 1 to form chemical bonds in the substrate. This, combined with the mechanical anchoring of the connecting hooks and connecting holes, enhances adhesion and provides both toughness and high-temperature resistance. At the same time, the use of ceramic micropowder of the same material as the substrate can eliminate the difference in thermal expansion coefficients between the coating and the substrate, preventing cracking at high temperatures. The functional layer made of nano-zirconia, nano-titanium dioxide, inorganic silicone resin, and tridecafluorooctyltriethoxysilane can achieve high wear resistance, superhydrophobicity and oleophobicity, easy cleaning, and high antibacterial properties. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the present invention.

[0016] In the diagram: 1. Substrate; 2. Penetration bonding layer; 3. Functional layer; 4. Bonding reinforcement component; 41. Connecting hole; 42. Connecting hook. Detailed Implementation

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

[0018] refer to Figure 1 A heat-resistant and easy-to-clean ceramic coating includes a substrate 1, a penetrating bonding layer 2, and a functional layer 3. The substrate 1 can be alumina ceramic, daily-use ceramic, or other ceramics, serving as the base for the ceramic coating. The penetrating bonding layer 2 is disposed on the surface of the substrate 1 and can uniformly cover the surface of the substrate 1. The thickness of the penetrating bonding layer 2 can be 8-15μm, forming a tight chemical bond with the substrate 1, thereby improving the connection strength between the penetrating bonding layer 2 and the substrate 1, and enhancing the anti-detachment performance under high temperature or long-term friction. The functional layer 3 is disposed on the surface of the penetrating bonding layer 2 away from the substrate 1 and can be 15-30μm thick, enabling the coating to achieve hydrophobic, non-stick, antibacterial, wear-resistant, and high-temperature resistant properties.

[0019] In some embodiments, a bonding reinforcement component 4 is also included. The bonding reinforcement component 4 is disposed between the substrate 1 and the penetration bonding layer 2, and can enhance the bonding strength between the two through mechanical anchoring, thereby improving the overall adhesion of the coating.

[0020] In some embodiments, the reinforcing component 4 includes a connecting hole 41 and a connecting hook 42. The connecting hole 41 may be a micropore formed on the surface of the substrate 1 near the penetrating bonding layer 2. It can be formed on the surface of the substrate 1 by laser drilling or chemical etching. The diameter can be 5-20 μm, the depth can be 10-30 μm, the hole spacing can be 50-100 μm, and it is distributed in an array to improve the uniformity of the force distribution on the substrate 1. The connecting hook 42 may be a hook-shaped protrusion formed by the penetrating bonding layer 2 extending into the connecting hole 41. It fits tightly with the inner wall of the connecting hole 41 to form an "anchor-fill" mechanical locking structure, which further improves the connection strength between the two.

[0021] In some embodiments, the penetration bonding layer 2 and the connecting hook 42 are made of the same material, both of which are made by mixing nano-silica sol (particle size 20-50nm) and ceramic micro powder in a mass ratio of 4:1-6:1. The nano-silica sol can provide chemical bonding sites, and the ceramic micro powder can enhance the structural strength. After curing at 300°C, a dense network structure is formed, which can increase the contact area between the penetration bonding layer 2 and the substrate 1 and the functional layer 3, thereby improving the connection strength. The connecting hook 42 can be made by mixing nano-silica sol and ceramic micro powder in a mass ratio of 4:1-6:1, and adding 0.3% inorganic dispersant such as ammonium polysilicate to form a slurry. The slurry is sprayed onto the surface of the substrate 1 and penetrates into the connecting hole 41. After drying at 120℃ and curing at 300℃, the silanol groups (Si-OH) and the hydroxyl groups on the surface of the substrate 1, such as Al-OH of ceramic, undergo a condensation reaction to form substrate chemical bonds such as Si-O-Al. The mechanical anchoring of the connecting hook 42 and the connecting hole 41 with the chemical bonds improves the adhesion and also has toughness and high temperature resistance. Moreover, the coefficient of thermal expansion is matched with that of the substrate 1, reducing cracking caused by the difference in the coefficients of thermal expansion between the two.

[0022] In some embodiments, the ceramic powder can be a nanoscale powder of the same material as the substrate 1. For example, when the substrate 1 is alumina ceramic, the ceramic powder is nano-alumina with a particle size strictly controlled between 0.3-1μm to ensure that the thermal expansion coefficient matches the substrate 1 by ≥90%, thereby avoiding coating cracking caused by thermal cycling.

[0023] In some embodiments, the functional layer 3 is a mixture of nano-zirconia, nano-titanium dioxide and inorganic silicone resin. It can be formed by mixing nano-zirconia, nano-titanium dioxide and inorganic silicone resin in a mass ratio of 3:1:6-4:1:8. The inorganic silicone resin is a continuous phase that can provide film-forming properties, the nano-zirconia is a reinforcing phase that can improve hardness, and the nano-titanium dioxide is a functional phase that can impart antibacterial properties. The three work together to form a coating system that has both functionality and structural stability.

[0024] In some embodiments, the particle size of nano-zirconia can be 20-50 nm, which can enable the pencil hardness of functional layer 3 to reach 8H. Nano-titanium dioxide can be anatase phase with a particle size of 10-30 nm, which can ensure photocatalytic activity and antibacterial rate to achieve effective antibacterial effect.

[0025] In some embodiments, 0.5%-1% of a fluorosilane coupling agent is added to the functional layer 3. The fluorosilane coupling agent can be tridecafluorooctyltriethoxysilane. The fluorocarbon chain in the tridecafluorooctyltriethoxysilane molecule can form a dense hydrophobic layer on the surface of the functional layer and has good compatibility with inorganic silicone resin. It will not cause the internal structure of the coating to become loose due to migration.

[0026] The specific production process is as follows: Etching the surface of substrate 1 with 10% hydrofluoric acid for 60 seconds forms a connecting hole 41 with a diameter of 10 μm and a depth of 20 μm, enhancing the mechanical anchoring effect between the coating and the substrate. After rinsing with water, the surface is dried. Nano-silica sol and alumina micropowder are mixed in a specific mass ratio, and ammonium polysilicate is added and stirred for 60 minutes to form a penetrating slurry. This penetrating slurry is sprayed onto the surface of substrate 1 and dried at 120℃ for 30 minutes, then sintered at 300℃ for 1 hour to form a 10 μm thick penetrating bonding layer 2. During this process, the penetrating slurry penetrates into the connecting hole 41. After drying at 120°C and curing at 300°C, the silanol groups (Si-OH) and the hydroxyl groups (Al-OH or Zr-OH) on the surface of the substrate 1 undergo a condensation reaction to form Si-O-Al or Si-O-Zr chemical bonds. At the same time, the ceramic micro powder fills the pores, forming a dual-bonding reinforcement component 4 of "chemical bonding + mechanical anchoring", thereby improving adhesion and eliminating the difference in thermal expansion coefficients between the coating and the substrate 1, thus avoiding cracking at high temperatures.

[0027] Nano-zirconia, nano-titanium dioxide, and potassium-based silicone resin are mixed in a certain mass ratio, and tridecafluorooctyltriethoxysilane is added and stirred for 90 minutes to form a functional mixed slurry. The functional mixed slurry is sprayed onto the surface of the penetrating bonding layer 2 and can be cured at 200℃ for 2 hours to form a functional layer 3 with a thickness of 20μm. A micron composite uneven structure is formed on the surface, with 5-10μm micron protrusions formed by curing inorganic silicone resin. 50-200nm nano-protrusions and nano-zirconia aggregates are distributed on the protrusions to achieve superhydrophobic and oleophobic coating, making it difficult for stains to adhere.

[0028] The specific working principle is as follows: In the reinforcing component 4, the connecting hook 42 is embedded in the connecting hole 41 to form a mechanical anchor, preventing the coating from sliding along the interface. At the same time, the silica sol that penetrates the bonding layer 2 reacts chemically with the surface of the substrate 1 to form a chemical bond, resisting the peeling force at high temperature. The two work together to improve the bonding strength between the coating and the substrate 1, ensuring that it remains stable under temperature cycling from -20℃ to 400℃.

[0029] Both the penetration bonding layer 2 and the functional layer 3 are inorganic materials, namely oxides of silicon, aluminum, and zirconium, with melting points ≥1500℃. They can maintain chemical stability in environments above 400℃. The nano-zirconia particles form a rigid skeleton in the functional layer 3. Combined with the cross-linking structure of the inorganic silicone resin, the coating hardness reaches 8H, effectively resisting friction and wear and extending service life. At the same time, the micro-nano composite uneven structure on the surface of the functional layer 3 can reduce the contact area with liquids and stains. The fluorosilane coupling agent can reduce the surface energy, making it difficult for stains to adhere, achieving "easy cleaning" and easy rinsing. The anatase phase nano titanium dioxide will generate hydroxyl radicals under light, which will destroy the bacterial cell membrane. At the same time, the superhydrophobic surface reduces water residue, blocks the bacterial growth environment, and achieves long-lasting antibacterial effect.

[0030] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heat-resistant and easy-to-clean ceramic coating, comprising a substrate (1), characterized in that: It also includes a penetration bonding layer (2), which is disposed on the surface of the substrate (1); Functional layer (3) is disposed on the surface of the permeation bonding layer (2) away from the substrate (1).

2. The heat-resistant and easy-to-clean ceramic coating according to claim 1, characterized in that: It also includes a bonding reinforcement component (4), which is disposed between the substrate (1) and the penetration bonding layer (2).

3. The heat-resistant and easy-to-clean ceramic coating according to claim 2, characterized in that: The bonding reinforcement component (4) includes a connection hole (41) which is provided on the surface of the substrate (1) near the penetration bonding layer (2); A connecting hook (42) is provided on the surface of the permeation bonding layer (2) near the substrate (1) and anchored in the connecting hole (41).

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