Structure for inducing targeted movement of water drops on surface of super-hydrophobic coating

Abstract

The utility model provides a structure for inducing targeted movement of water drops on the surface of a super-hydrophobic coating, which comprises a substrate, a super-hydrophobic material is sprayed on the surface of the substrate to form the super-hydrophobic coating, a triangular pattern is processed on the surface of the super-hydrophobic coating through a laser marking machine, and the depth of the triangular pattern is equal to the thickness of the super-hydrophobic coating. And the process is simple, and the super-hydrophobic coating can achieve a better dropping liquid transportation effect.

Description

Technical Field

[0001] The utility model mainly relates to the technical field related to super-hydrophobic coatings, and specifically to a structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating. Background Art

[0002] Superhydrophobicity refers to the surface property with a contact angle greater than 150°. Because of the superhydrophobicity, superhydrophobic coatings have broad application prospects in various industries such as industry, aviation, and shipbuilding.

[0003] The core principle of the current method for preparing super-hydrophobic materials is to perform surface treatment on the substrate and prepare a super-hydrophobic coating on the surface. For example, in Chinese patent CN100465343C, a copper sheet is reacted in a closed container to obtain a micro-nano structure, and then a super-hydrophobic property is obtained through further reaction; in CN101423945A, a porous structure is first prepared on the metal surface by anodization, and then the surface is modified by low-temperature plasma technology to obtain a micro-nano structure, and finally a modification liquid is used to act on the metal surface to obtain a super-hydrophobic property.

[0004] At present, the research on super-hydrophobic coatings is mostly focused on coating materials and coating preparation processes, and there is little research on how to further improve the transport capacity and performance of the coating for water droplets after preparation. Therefore, it is necessary to propose a structure on the surface of super-hydrophobic coatings that induces targeted movement of water droplets, so as to further improve the transport performance of super-hydrophobic coatings for micro-droplets. Utility Model Content

[0005] In order to solve the shortcomings of the current technology, the utility model combines the existing technology and, based on practical applications, provides a structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating. The process is simple and can enable the super-hydrophobic coating to achieve a better droplet transport effect.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating comprises a substrate, a super-hydrophobic material is sprayed on the surface of the substrate to form a super-hydrophobic coating, a triangular pattern is processed on the surface of the super-hydrophobic coating by a laser marking machine, and the depth of the triangular pattern is equal to the thickness of the super-hydrophobic coating.

[0008] Furthermore, the super hydrophobic coating has a thickness of 0.01 mm ± 0.002 mm.

[0009] Furthermore, the triangular pattern is arranged singly on the surface of the super-hydrophobic coating.

[0010] Furthermore, the triangular patterns are continuously arranged on the surface of the super-hydrophobic coating, and the tips of the triangular patterns point in the same direction.

[0011] Furthermore, the triangular patterns are arranged discontinuously at a certain interval on the surface of the super-hydrophobic coating, and the tips of the triangular patterns point in the same direction.

[0012] Furthermore, the triangular pattern is an isosceles triangle.

[0013] Furthermore, the ratio of the height of the triangle pattern to the width of the opening end is in the range of [1, 60].

[0014] Beneficial effects of the utility model:

[0015] 1. The utility model processes a triangular pattern on the super-hydrophobic coating to remove part of the super-hydrophobic coating and completely expose the substrate surface. On the one hand, it can ensure that the surface performance of the substrate is not affected. On the other hand, the triangular pattern can make the droplet move spontaneously from the tip of the triangle to the bottom, thereby improving the transport capacity of the super-hydrophobic coating for the droplet.

[0016] 2. The triangular pattern in the utility model can be set singly, in parallel or at intervals according to the actual engineering situation. The structure has strong versatility and simple process, and is suitable for practical application in engineering.

[0017] 3. In the present invention, the isosceles triangle pattern is easy to process and arrange, and the super-hydrophobic coating has better transport performance for droplets. The movement speed of the micro-droplets can be controlled by reasonably controlling the ratio of the angular pattern height to the opening end width. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 It is a schematic diagram of the principle of the utility model.

[0019] Attached Figure 2 Schematic diagram of the triangle pattern layout Figure 1 .

[0020] Attached Figure 3 Schematic diagram of the triangle pattern layout Figure 2 .

[0021] Attached Figure 4 Schematic diagram of the triangle pattern layout Figure 3 .

[0022] Attached Figure 5 Schematic diagram of the triangle pattern size.

[0023] Numbers shown in the accompanying drawings:

[0024] 1. Substrate; 2. Hydrophobic coating; 3. Triangular pattern. DETAILED DESCRIPTION

[0025] The utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by this application.

[0026] This embodiment provides a structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating.

[0027] refer to Figure 1 The figure shows a schematic diagram of the relevant structure.

[0028] In this embodiment, a technology for processing the surface of a super-hydrophobic coating is used, which does not require more preliminary work and the subsequent maintenance work is also easy to operate.

[0029] In this embodiment, a super-hydrophobic coating 2 is firstly produced by spraying on a hydrophilic substrate 1, and then a triangular pattern 3 is processed on the super-hydrophobic coating 2, so that the characteristics of the super-hydrophobic and super-hydrophilic interface can be fully utilized to enable the triangular pattern 3 to achieve directional driving of the droplets.

[0030] In this embodiment, the specific technology is as follows: the prepared fluorine-based super-hydrophobic coating is artificially sprayed on the surface of the super-hydrophilic substrate 1 for 6-8 layers to form the best super-hydrophobic coating 2, and the coating thickness average is 0.01mm±0.002mm, and is placed in a drying oven for drying for 24 hours, until the super-hydrophobic coating 2 is cured to obtain a fluorine-based super-hydrophobic coating, and then a laser marking machine is set for processing: laser speed 700, line spacing 0.01, power 60%; under this parameter, the super-hydrophobic coating 2 on the surface of the designed hydrophilic triangular pattern can be completely removed and the surface of the substrate 1 can be completely exposed while ensuring that the surface performance of the substrate 1 is not affected, that is, in this embodiment, the thickness of the triangular pattern 3 is from the surface of the super-hydrophobic coating 2 to the surface of the substrate 1, which is equal to the thickness of the super-hydrophobic coating 2.

[0031] For the relevant structures of this embodiment, the verification is as follows: Figure 1 As shown, the processed triangular pattern 3 is first pre-wetted, and a drop of liquid is placed on the tip of the hydrophilic triangular pattern 3. It can be found that the drop of liquid moves to the bottom spontaneously in a directional manner, and its acting force is based on the Laplace force and the wetting gradient force as the driving force.

[0032] In this embodiment, the parameters can be changed by changing the shape of the triangle pattern, referring to Figure 5 As shown, define parameter δ = h d, where h refers to the height of the triangular pattern, and d refers to the width of the opening of the triangular pattern. Experimental verification shows that the droplet movement speed parameter δ is inversely proportional to the movement speed v, and the ratio of h to d determines the size of δ. Therefore, in actual engineering, the size of δ (which can be adjusted by adjusting the ratio of the height to the width of the triangle) can be adjusted according to the required micro-droplet transportation conditions to achieve control of the movement speed of the micro-droplets, preferably 1≤δ≤60.

[0033] In this embodiment, the triangular pattern can be arranged in many ways. Figure 2 As shown, it is a continuous arrangement mode, which can make the droplets maintain continuity during the transportation process on the surface of the substrate material. Figure 3 As shown, this is a discontinuous arrangement, which can avoid certain substrate surfaces that cannot be damaged. Figure 4 It should be noted that in this embodiment, a triangular pattern is shown that runs through the entire substrate, but the size and direction of the triangular hydrophilic pattern can be adjusted according to the actual engineering situation, as long as δ is within the specified range, and there is no specific requirement for the specific start and end path.

[0034] This embodiment aims to realize directional transport of micro droplets. When the droplets contact the hydrophilic triangular tip, they will have transport performance under the action of driving force. Similarly, for the pre-wetted substrate, the influence of capillary force on self-transport can be eliminated, and as δ decreases, the transport performance of the micro droplets is enhanced, and the best transport effect can be achieved without affecting the overall effect. At the same time, the proposed related structure is easy to realize and process in terms of technology, and is easy to promote and apply.

Claims

1. A structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating, comprising a substrate, a super-hydrophobic material is sprayed on the surface of the substrate to form a super-hydrophobic coating, characterized in that: The surface of the super-hydrophobic coating is processed with a triangular pattern by a laser marking machine, and the depth of the triangular pattern is equal to the thickness of the super-hydrophobic coating.

2. The structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating according to claim 1, characterized in that: The thickness of the super hydrophobic coating is 0.01 mm ± 0.002 mm.

3. The structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating according to claim 1, characterized in that: The triangular pattern is arranged singly on the surface of the super-hydrophobic coating.

4. The structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating according to claim 1, characterized in that: The triangular patterns are continuously arranged on the surface of the super-hydrophobic coating, and the tips of the triangular patterns point in the same direction.

5. The structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating according to claim 1, characterized in that: The triangular patterns are arranged discontinuously at a certain interval on the surface of the super-hydrophobic coating, and the tips of the triangular patterns point in the same direction.

6. The structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating according to claim 1, characterized in that: The triangular pattern is an isosceles triangle.

7. The structure for inducing targeted movement of water droplets on the surface of a super-hydrophobic coating according to claim 1, characterized in that: The ratio of the height of the triangle pattern to the width of the opening end is in the range of [1, 60].

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