Preparation method of corrosion-resistant, de-icing and wear-resistant super-hydrophobic coating and product prepared by the method

Abstract

This invention discloses a method for preparing a corrosion-resistant, anti-icing, and wear-resistant superhydrophobic coating and the resulting product. The method uses graphite micropowder, alumina micropowder, ceramic fiber, nano-alumina powder, and methyl silicone resin as main raw materials, and ethanol as a dispersant. The materials are mixed according to a specific mass ratio to obtain a coating, which is then applied by spraying or dip coating and followed by heat treatment to form a superhydrophobic coating on different substrate surfaces. The product with the superhydrophobic coating exhibits excellent surface corrosion resistance, anti-icing, and wear resistance. The preparation method has many advantages, including simple process, low cost, environmental friendliness, and superior performance, and has broad application prospects in the field of material surface protection.

Description

Technical Field

[0001] This invention relates to the field of coating materials technology, and in particular to a method for preparing a corrosion-resistant, anti-icing, wear-resistant, superhydrophobic coating and the product obtained therefrom. Background Technology

[0002] Superhydrophobic coatings possess unique micro / nano structures and low surface energy, enabling them to strongly repel water. Therefore, these coatings have broad application prospects in many fields, such as corrosion resistance, self-cleaning, anti-icing, oil-water separation, and fluid drag reduction. Besides constructing the surface micro / nano structures, selecting appropriate low surface energy materials is also a key technology for obtaining superhydrophobic coatings. Fluorine compounds generally possess low surface energy, making them a focus of research in the field of superhydrophobic coatings. However, the relatively expensive fluorine can cause serious toxicity to humans and the environment; therefore, the preparation of fluorine-free superhydrophobic coatings has become one of the critical problems that urgently needs to be solved.

[0003] Currently, the low mechanical strength and poor chemical stability of superhydrophobic coatings have become key obstacles restricting their application development. Due to the low surface energy of superhydrophobic coatings, their mechanical strength is generally low (mainly manifested in poor wear resistance), leading to easy damage and loss of crucial superhydrophobic properties and chemical stability during practical applications. Therefore, developing new low-cost preparation technologies and researching fluorine-free superhydrophobic coatings with high wear resistance and high chemical stability (e.g., corrosion resistance) is of great significance for promoting the technological development and upgrading of superhydrophobic materials and broadening their practical application fields. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a simple, low-cost, and environmentally friendly method for preparing a corrosion-resistant, anti-icing, and wear-resistant superhydrophobic coating. This method uses fluorine-free micro / nano-sized inorganic powders and methyl silicone resin as raw materials, thus solving the problems of low mechanical strength and poor chemical stability in existing superhydrophobic coatings. Another objective of this invention is to provide a product obtained using the above-described preparation method.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] This invention provides a method for preparing a corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating, comprising the following steps:

[0007] (1) Using micron / nano inorganic powder and methyl silicone resin as raw materials and ethanol as dispersant, the micron / nano inorganic powder is composed of graphite with an average particle size of 1-5 microns, alumina with an average particle size of 1-5 microns, ceramic fibers with a diameter × length of 1-5 microns × 40-200 microns, and nano alumina with an average particle size of 50-200 nanons; the powder is mixed according to the following weight parts: 10-20 parts graphite, 10-20 parts alumina, 5-10 parts ceramic fibers, 15-30 parts nano alumina, 3-7 parts methyl silicone resin, and 100-500 parts ethanol. After uniform mixing, a coating is obtained.

[0008] (2) The coating is applied to the substrate surface by spraying or dipping, and then heat-treated at 100-200°C for 10-30 minutes to obtain a corrosion-resistant, anti-icing, wear-resistant, superhydrophobic coating on the substrate surface.

[0009] Furthermore, the ceramic fiber described in this invention is alumina fiber, mullite fiber, or asbestos fiber. The matrix material is ceramic, glass, metal, plastic, or fabric.

[0010] The product prepared by the above-mentioned method for preparing corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating has a surface water contact angle of 150-170° and a surface water roll-off angle of 1-3°.

[0011] The present invention has the following beneficial effects:

[0012] This invention addresses the critical limitations of current superhydrophobic coatings, such as poor wear resistance, weak chemical stability, and fluorine content. It proposes using fluorine-free micro / nano-sized inorganic powders and methyl silicone resin as raw materials to fundamentally solve the mechanical strength and chemical stability problems of superhydrophobic coatings, while also exhibiting excellent anti-icing properties (delaying the icing time on the coating surface in a freezer to over 454 seconds). Furthermore, combined with a simple spraying or dip-coating process and heat treatment, a high-performance novel superhydrophobic coating is obtained. This invention offers numerous advantages, including simple process, ease of large-scale production, low cost, and environmental friendliness, and has a broad market potential in the field of superhydrophobic coatings. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings:

[0014] Figure 1 These are the corrosion resistance test results of the product with superhydrophobic coating obtained in the embodiments of the present invention;

[0015] Figure 2 These are the anti-icing performance test results of the product with superhydrophobic coating obtained in the embodiments of the present invention;

[0016] Figure 3 These are the wear resistance test results of the product with superhydrophobic coating obtained in the embodiments of the present invention. Detailed Implementation

[0017] Example 1:

[0018] This embodiment describes a method for preparing a corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating, the steps of which are as follows:

[0019] (1) Using micron / nano inorganic powder and methyl silicone resin as raw materials and ethanol as dispersant, the micron / nano inorganic powder is composed of graphite with an average particle size of 1 micron, alumina with an average particle size of 5 microns, alumina fibers with a diameter × length of 1-2 microns × 40-60 microns, and nano alumina with an average particle size of 50 nanons; the powder is mixed according to the following weight parts: 10 parts graphite, 20 parts alumina, 5 parts alumina fibers, 15 parts nano alumina, 3 parts methyl silicone resin, and 200 parts ethanol. After uniform mixing, a coating is obtained.

[0020] (2) The above coating is applied to the surface of the ceramic substrate by spraying process, and then heat-treated at 100°C for 30 minutes to obtain a corrosion-resistant, anti-icing, wear-resistant, superhydrophobic coating on the surface of the ceramic substrate.

[0021] The coated product obtained in this embodiment has a surface water contact angle of 170° and a surface water roll-off angle of 1°. It remains stable for more than 180 days in strong acid (pH=1), strong alkali (pH=14), or high-salt solutions (3.5wt% NaCl solution). Figure 1 (As shown). Anti-icing performance test as follows: Figure 2 As shown, in the freezer, the icing time on the coating surface was delayed to 455 seconds. A sandpaper abrasion test, conducted by placing a 100-gram weight on the coating as a constant pressure, showed that the coating still exhibited superhydrophobicity even after a wear distance of 12 meters.

[0022] Example 2:

[0023] This embodiment describes a method for preparing a corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating, the steps of which are as follows:

[0024] (1) Using micron / nano inorganic powder and methyl silicone resin as raw materials and ethanol as dispersant, the micron / nano inorganic powder is composed of graphite with an average particle size of 2 microns, alumina with an average particle size of 5 microns, mullite fiber with a diameter × length of 3-5 microns × 150-200 microns, and nano alumina with an average particle size of 100 nanons; the powder is mixed according to the following weight parts: 20 parts graphite, 10 parts alumina, 8 parts mullite fiber, 20 parts nano alumina, 5 parts methyl silicone resin, and 500 parts ethanol. After being mixed evenly, a coating is obtained.

[0025] (2) The above coating is applied to the surface of the glass substrate by dip coating process, and then heat-treated at 200°C for 10 minutes to obtain a corrosion-resistant, anti-icing, wear-resistant, superhydrophobic coating on the surface of the glass substrate.

[0026] The coated product obtained in this embodiment has a surface water contact angle of 160° and a surface water roll-off angle of 2°. It remains stable for more than 180 days in strong acid (pH=1), strong alkali (pH=14), or high-salt solutions (3.5wt% NaCl solution). Figure 1 (As shown). Anti-icing performance test as follows: Figure 2 As shown, in the freezer, the icing time on the coating surface was delayed to 454 seconds. A sandpaper abrasion test, conducted by placing a 100-gram weight on the coating as a constant pressure, showed that the coating still exhibited superhydrophobicity even after a wear distance of 12 meters.

[0027] Example 3:

[0028] This embodiment describes a method for preparing a corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating, the steps of which are as follows:

[0029] (1) Using micron / nano inorganic powder and methyl silicone resin as raw materials and ethanol as dispersant, the micron / nano inorganic powder is composed of graphite with an average particle size of 5 microns, alumina with an average particle size of 1 micron, asbestos fiber with a diameter × length of 1-2 microns × 150-200 microns, and nano alumina with an average particle size of 200 nanons; the powder is mixed according to the following weight parts: 10 parts graphite, 20 parts alumina, 10 parts asbestos fiber, 30 parts nano alumina, 7 parts methyl silicone resin, and 300 parts ethanol. After being mixed evenly, a coating is obtained.

[0030] (2) The above coating is applied to the surface of the metal substrate by spraying process, and then heat-treated at 100°C for 30 minutes to obtain a corrosion-resistant, anti-icing, wear-resistant, superhydrophobic coating on the surface of the metal substrate.

[0031] The coated product obtained in this embodiment has a surface water contact angle of 170° and a surface water roll-off angle of 1°. It remains stable for more than 180 days in strong acid (pH=1), strong alkali (pH=14), or high-salt solutions (3.5wt% NaCl solution). Figure 1 (As shown). Anti-icing performance test as follows: Figure 2 As shown, in the freezer, the icing time on the coating surface was delayed to 455 seconds. A sandpaper abrasion test, conducted by placing a 100-gram weight on the coating as a constant pressure, showed that the coating still exhibited superhydrophobicity even after a wear distance of 12 meters.

[0032] Example 4:

[0033] This embodiment describes a method for preparing a corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating, the steps of which are as follows:

[0034] (1) Using micron / nano inorganic powder and methyl silicone resin as raw materials and ethanol as dispersant, the micron / nano inorganic powder is composed of graphite with an average particle size of 3 microns, alumina with an average particle size of 5 microns, mullite fiber with a diameter × length of 3-5 microns × 100-150 microns, and nano alumina with an average particle size of 100 nanons; the powder is mixed according to the following weight parts: 15 parts graphite, 15 parts alumina, 5 parts mullite fiber, 15 parts nano alumina, 4 parts methyl silicone resin, and 400 parts ethanol. After being mixed evenly, a coating is obtained.

[0035] (2) The above coating is applied to the surface of the plastic substrate by dip coating process, and then heat-treated at 150°C for 20 minutes to obtain a corrosion-resistant, anti-icing, wear-resistant, superhydrophobic coating on the surface of the plastic substrate.

[0036] The coated product obtained in this embodiment has a surface water contact angle of 150° and a surface water roll-off angle of 3°. It remains stable for more than 180 days in strong acid (pH=1), strong alkali (pH=14), or high-salt solutions (3.5wt% NaCl solution). Figure 1 (As shown). Anti-icing performance test as follows: Figure 2 As shown, in the freezer, the icing time on the coating surface was delayed to 454 seconds. A sandpaper abrasion test, conducted by placing a 100-gram weight on the coating as a constant pressure, showed that the coating still exhibited superhydrophobicity even after a wear distance of 12 meters.

[0037] Example 5:

[0038] This embodiment describes a method for preparing a corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating, the steps of which are as follows:

[0039] (1) Using micron / nano inorganic powder and methyl silicone resin as raw materials and ethanol as dispersant, the micron / nano inorganic powder is composed of graphite with an average particle size of 5 microns, alumina with an average particle size of 2 microns, asbestos fiber with a diameter × length of 2-4 microns × 100-150 microns, and nano alumina with an average particle size of 50 nanons; the powder is mixed according to the following weight parts: 10 parts graphite, 15 parts alumina, 7 parts asbestos fiber, 25 parts nano alumina, 6 parts methyl silicone resin, and 100 parts ethanol. After being mixed evenly, a coating is obtained.

[0040] (2) The above coating is applied to the surface of the fabric substrate by spraying process, and then heat-treated at 100°C for 30 minutes to obtain a corrosion-resistant, anti-icing, wear-resistant, superhydrophobic coating on the surface of the fabric substrate.

[0041] The coated product obtained in this embodiment has a surface water contact angle of 160° and a surface water roll-off angle of 2°. It remains stable for more than 180 days in strong acid (pH=1), strong alkali (pH=14), or high-salt solutions (3.5wt% NaCl solution). Figure 1 (As shown). Anti-icing performance test as follows: Figure 2 As shown, in the freezer, the icing time on the coating surface was delayed to 455 seconds. A sandpaper abrasion test, conducted by placing a 100-gram weight on the coating as a constant pressure, showed that the coating still exhibited superhydrophobicity even after a wear distance of 12 meters.

Claims

1. A method for preparing a corrosion-resistant, anti-icing, wear-resistant, superhydrophobic coating, characterized in that... Includes the following steps: (1) Using micron / nano inorganic powder and methyl silicone resin as raw materials and ethanol as dispersant, the micron / nano inorganic powder is composed of graphite with an average particle size of 1-5 microns, alumina with an average particle size of 1-5 microns, ceramic fibers with a diameter × length of 1-5 microns × 40-200 microns, and nano alumina with an average particle size of 50-200 nanons; the powder is mixed according to the following weight parts: 10-20 parts graphite, 10-20 parts alumina, 5-10 parts ceramic fibers, 15-30 parts nano alumina, 3-7 parts methyl silicone resin, and 100-500 parts ethanol. After uniform mixing, a coating is obtained. (2) The coating is applied to the substrate surface by spraying or dipping, and then heat-treated at 100-200°C for 10-30 minutes to obtain a corrosion-resistant, anti-icing, wear-resistant, superhydrophobic coating on the substrate surface. The coating surface has a water contact angle of 150–170° and a water roll-off angle of 1–3°; the coating surface ice-covering time is delayed to more than 454 seconds in a freezer; it is stable for more than 180 days in strong acid with pH=1, strong alkali with pH=14, or high-salt solutions of 3.5 wt% NaCl solution; when a 100-gram weight is placed on the coating as a constant pressure, the coating still exhibits superhydrophobicity when the wear distance reaches 12 meters.

2. The method for preparing the corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating according to claim 1, characterized in that: The ceramic fiber is either alumina fiber or mullite fiber.

3. The method for preparing the corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating according to claim 1 or 2, characterized in that: The substrate is made of ceramic, glass, metal, plastic, or fabric.

4. A superhydrophobic coating prepared by the method for preparing a corrosion-resistant, anti-icing, wear-resistant, and superhydrophobic coating according to any one of claims 1-3.

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