A transparent super-hydrophobic coating and its preparation method and application

Abstract

The present invention belongs to the field of material surface treatment and coating technology, and specifically relates to a transparent super-hydrophobic coating and its preparation method and application. The preparation method adopts the following steps: silane and epoxy resin optical glue are dissolved in isopropanol to obtain a mixed solution; solid basic materials are soaked or sprayed with the mixed solution, and dried to obtain a transparent super-hydrophobic coating. The present invention constructs a transparent super-hydrophobic coating on a solid substrate at one time by preparing a transparent solvent containing hydrophobic silane, does not involve the use of complex optoelectronic instruments, and has the advantages of simple operation, fast and low cost. The super-hydrophobic coating is transparent and can maintain the morphology of the matrix material itself. The advantage of its high mechanical strength ensures the long life of the matrix hydrophobicity, and has broad application prospects in the fields of automotive glass demisting, building exterior walls and glass self-cleaning, electronic product surfaces and medical device surfaces waterproofing.

Description

Technical Field

[0001] The present invention belongs to the technical field of material surface treatment and coatings, and in particular relates to a transparent super-hydrophobic coating and a preparation method and application thereof. Background Art

[0002] The superhydrophobic phenomenon is widely present in nature. Many plant surfaces have high hydrophobicity and self-cleaning functions, such as the surfaces of lotus leaves and rice leaves. The so-called superhydrophobic ability means that it has significant hydrophobicity, desorption, anti-sticking, self-cleaning functions, etc. According to the different degrees of water infiltration on the solid surface, the solid surface can be divided into hydrophilic surface and hydrophobic surface. It is generally defined that the stable contact angle of the superhydrophobic material surface is greater than 150°.

[0003] Super-hydrophobic materials are widely used in national defense, industrial and agricultural production and daily life due to their excellent super-water repellency, such as super-hydrophobic coatings and surface treatment technologies are applied to buildings, automobiles, ships, submarine shells, outdoor communication antennas, the inner wall of oil pipelines, micro-injection needle tips, textiles, leather, and can also be made into waterproof and anti-fouling clothing and leather shoes. It is precisely because of such a demand that the application research of super-hydrophobic materials has become more and more concerned. At present, the methods for constructing super-hydrophobic surfaces at home and abroad mainly include sol-gel method, template method, self-assembly method and chemical etching method, etc. Although these methods can make the material and the interface have a large contact angle, there are many defects in practical applications. For example, the hydrophobic surface obtained is unevenly distributed, the strength is too low, the required cost is expensive, the preparation process is complicated, the yield is low, the material cannot be recycled, etc., and various defects make super-hydrophobic materials unable to be mass-produced on a large scale. In particular, the transparency of super-hydrophobic coatings is an important consideration. At present, there are some super-hydrophobic coatings that can reach a fairly high transparency, so that it can be applied to transparent materials, such as glass, plastics, etc. This is very important for maintaining the clarity, light transmittance and visual experience of the surface of the object. However, the transparency of the super-hydrophobic coating remains a challenge. In some cases, factors such as the thickness, texture, and refractive index of the coating may affect its transparency. In order to improve transparency, it is necessary to explore new materials and R&D processes to reduce the scattering and reflection of light by the coating to achieve a better balance between transparency and hydrophobic properties. In addition, the mechanical strength of the hydrophobic coating determines its service life. At present, most hydrophobic coatings fall off automatically or due to friction in the later stage, which seriously affects their promotion in the application market. Therefore, the consideration of mechanical strength is also an important indicator for the industrialization development of super-hydrophobic coatings. Summary of the invention

[0004] In view of the deficiencies in the prior art, the first object of the present invention is to provide a method for preparing a transparent super-hydrophobic coating, which has the advantages of simple operation, rapidity and low cost.

[0005] The second object of the present invention is to provide a transparent super-hydrophobic coating prepared by the above method, wherein the transparent super-hydrophobic coating has good super-hydrophobicity and mechanical strength.

[0006] The third object of the present invention is to provide an application of the transparent super-hydrophobic coating, which can be applied to the surface super-hydrophobic treatment of various solid basic materials.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for preparing a transparent super-hydrophobic coating, the preparation method adopts the following steps:

[0009] (1) Dissolve silane and epoxy resin optical adhesive in isopropanol in a volume ratio of 1:1 to obtain a mixed solution;

[0010] (2) Soak or spray the solid basic material with the mixed solution obtained in step (1), and dry it to obtain a transparent super-hydrophobic coating.

[0011] Furthermore, in step (1), the silane is perfluorosilane, octadecyltrichlorosilane, hexadecyltrichlorosilane, octyltrichlorosilane or hexadecyltrimethoxysilane.

[0012] Furthermore, in step (1), the volume fraction of the silane in the mixed solution is 1.0-35%.

[0013] Furthermore, in step (2), the solid matrix material is ceramic, iron sheet, plastic sheet, glass sheet, paper or wood board, etc.

[0014] Furthermore, in step (2), the soaking time is 8-10 min.

[0015] The transparent super-hydrophobic coating prepared by the above method.

[0016] The application of the transparent super-hydrophobic coating can be used to prepare hydrophobic materials.

[0017] The present invention constructs a transparent super-hydrophobic coating on a solid substrate at one time by preparing a transparent solvent containing hydrophobic silane, the binding force between the oxygen-containing groups of the silane and the epoxy resin and the substrate material is enhanced, the adhesion between the hydrophobic material and the solid substrate is improved, and the mechanical strength is significantly improved.

[0018] Beneficial effects: (1) The present invention constructs a transparent super-hydrophobic coating on a solid substrate in one go by preparing a transparent solvent containing hydrophobic silane, which does not involve the use of complex optoelectronic instruments and harsh preparation processes; the solid substrate used in the preparation of the transparent super-hydrophobic coating by the present invention is a common industrial life material and has universal applicability in the industrial field; the preparation method provided by the present invention has the advantages of simple operation, rapidity, low cost, long hydrophobic life and high strength.

[0019] (2) The transparent super-hydrophobic coating prepared by the present invention does not cover the original morphological features of the substrate material and has super-hydrophobicity. The transparent property of the coating can be applied to the fields of outdoor communication equipment antennas, shells of various vehicles, self-cleaning of building glass surfaces, and microfluidic channels; the super-hydrophobic coating after mechanical scraping also shows good super-hydrophobicity, indicating that the transparent super-hydrophobic coating prepared by the present invention has good mechanical strength resistance and can be applied to various fields of industry and life, further expanding the application prospects of the super-hydrophobic coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the hydrophobic effect of the transparent super-hydrophobic coating prepared in Example 1, Figure 1 A is a hydrophobic effect diagram of the solid matrix material before hydrophobic treatment; Figure 1 B is a hydrophobic effect diagram of the solid matrix material after hydrophobic treatment;

[0021] Figure 2 Schematic diagram of the strength test of the transparent super-hydrophobic coating prepared in Example 2. DETAILED DESCRIPTION

[0022] The present invention will be further described below by way of examples, which are not intended to further limit the present invention. It should be understood by those skilled in the art that equivalent replacements or corresponding improvements made to the present invention still fall within the scope of protection of the present invention. Example 1

[0023] (1) At room temperature, 20% by volume of hydrophobic silane perfluorosilane and epoxy resin optical adhesive are dissolved in isopropanol in a volume ratio of 1:1 to obtain a transparent mixed solution;

[0024] (2) Immerse the ceramic in the mixed solution obtained in step (1), let it stand for 8-10 minutes, take it out and dry it, and a transparent super-hydrophobic coating is obtained. Example 2

[0025] (1) At room temperature, 20% by volume of hydrophobic silane hexadecyltrimethoxysilane and epoxy resin optical adhesive were dissolved in isopropanol in a volume ratio of 1:1 to obtain a transparent mixed solution;

[0026] (2) Place the mixed solution of step 1) in a spray bottle and spray it directly on the paper. After drying, a transparent super-hydrophobic coating is obtained. Example 3

[0027] (1) At room temperature, 20% by volume of hydrophobic silane octadecyltrichlorosilane and epoxy resin optical adhesive were dissolved in isopropanol in a volume ratio of 1:1 to obtain a transparent mixed solution;

[0028] (2) Place the mixed solution of step 1) in a spray bottle and spray it directly on the plastic sheet. After drying, a transparent super-hydrophobic coating is obtained. Example 4

[0029] (1) At room temperature, 20% by volume of hydrophobic silane hexadecyltrichlorosilane and epoxy resin optical adhesive were dissolved in isopropanol in a volume ratio of 1:1 to obtain a transparent mixed solution;

[0030] (2) Immerse the wooden planks in the mixed solution, let it stand for 8-10 min, take it out and dry it to obtain a transparent super-hydrophobic coating. Example 5

[0031] (1) At room temperature, 20% by volume of hydrophobic silane octyltrichlorosilane and epoxy resin optical adhesive were dissolved in isopropanol in a volume ratio of 1:1 to obtain a transparent mixed solution;

[0032] (2) Immerse the iron sheet in the mixed solution, let it stand for 8-10 min, take it out and dry it to obtain a transparent super-hydrophobic coating. Example 6

[0033] (1) At room temperature, 20% by volume of hydrophobic silane hexadecyltrimethoxysilane and epoxy resin optical adhesive were dissolved in isopropanol in a volume ratio of 1:1 to obtain a transparent mixed solution;

[0034] (2) Place the mixed solution of step 1) in a spray bottle and spray it directly on the glass sheet. After drying, a transparent super-hydrophobic coating is obtained.

[0035] Comparative Example 1

[0036] (1) At room temperature, 20% by volume of hydrophobic silane hexadecyltrimethoxysilane was dissolved in isopropanol to obtain a transparent mixed solution;

[0037] (2) Place the mixed solution of step (1) in a spray bottle and spray it directly on the glass sheet. After drying, a transparent super-hydrophobic coating is obtained.

[0038] Comparative Example 2

[0039] (1) At room temperature, 20% by volume of hydrophobic silane perfluorosilane is dissolved in isopropanol to obtain a transparent mixed solution;

[0040] (2) Place the mixed solution of step (1) in a spray bottle and spray it directly on the glass sheet. After drying, a transparent super-hydrophobic coating is obtained.

[0041] Comparative Example 3

[0042] (1) At room temperature, 20% by volume of hydrophobic silane octadecyltrichlorosilane was dissolved in isopropanol to obtain a transparent mixed solution;

[0043] (2) Place the mixed solution of step (1) in a spray bottle and spray it directly on the glass sheet. After drying, a transparent super-hydrophobic coating is obtained.

[0044] Performance Testing

[0045] (1) Use a pipette to draw 4 μL of water and gently drop it on the surface of the super-hydrophobic solid substrate prepared in Example 1, and then use a contact angle meter to measure the contact angle. At the same time, take an untreated solid substrate as a control. After dropping water, measure the contact angle. Figure 1 As shown, Figure 1 A is a hydrophobic effect diagram of the solid matrix material before hydrophobic treatment; Figure 1 B is a hydrophobic effect diagram of the solid matrix material after hydrophobic treatment. Figure 1 It can be seen that the super-hydrophobic coating prepared in the embodiment of the present invention shows good hydrophobicity, and water droplets exist on the surface of the substrate in a nearly spherical shape.

[0046] (2) After mechanically scraping the super-hydrophobic coating prepared in Example 2, 4 μL of water was taken with a pipette and gently dropped on the treated coating surface, and then the contact angle was measured with a contact angle meter, as shown in FIG. Figure 2 shown. Figure 2 The display effect of the transparent super-hydrophobic coating on the paper is demonstrated, and after mechanical scratching, it still maintains good hydrophobicity.

[0047] The hydrophobic properties of the super hydrophobic coatings prepared in Example 6 and Comparative Example 1 were compared using the same method as in step (2). The results are shown in Table 1.

[0048] Table 1 Comparative results of hydrophobic properties of super hydrophobic coatings prepared in Example 6 and Comparative Example 1

[0049]

[0050] As can be seen from Table 1, the transparent super-hydrophobic coatings prepared in Example 6 and Comparative Example 1 initially have good hydrophobic effects. After mechanical scraping, the super-hydrophobic coating prepared in the example still maintains a high super-hydrophobicity, which is basically consistent with the initial value. However, the hydrophobic effect of the super-hydrophobic coating prepared in the comparative example is significantly reduced, and the mechanical strength is greatly reduced.

[0051] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A method for preparing a transparent super-hydrophobic coating, characterized in that: The preparation method adopts the following steps: (1) Dissolving silane and epoxy resin optical adhesive in isopropanol at room temperature in a volume ratio of 1:1 to obtain a mixed solution, wherein the volume fraction of silane in the mixed solution is 20%, and the silane is perfluorosilane, octadecyltrichlorosilane, hexadecyltrichlorosilane, octyltrichlorosilane or hexadecyltrimethoxysilane; (2) Soak or spray the solid basic material with the mixed solution obtained in step (1), and dry it to obtain a transparent super-hydrophobic coating.

2. The preparation method according to claim 1, characterized in that: In step (2), the solid substrate material is ceramic, iron sheet, plastic sheet, glass sheet, paper or wood board.

3. The preparation method according to claim 1, characterized in that: In step (2), the soaking time is 8-10 minutes.

4. The transparent super-hydrophobic coating prepared by the method described in any one of claims 1 to 3.

5. The use of the transparent super hydrophobic coating prepared by the method according to any one of claims 1 to 3 and / or the transparent super hydrophobic coating according to claim 4, characterized in that: The transparent super-hydrophobic coating can be used to prepare hydrophobic materials.

Images