KR20190037517A - A surface structure of metal having an Super hydrophobic property coatings, System apparatus and Method for fabricating of the same - Google Patents

Abstract

The present invention provides: a metal surface structure having super water-repellent characteristics and capable of repelling and collecting water in a desired direction; a system forming the same; and a method for forming the same. According to the present invention, a water-repellent pattern (20) is formed on the metal surface (10) with a linear shape directivity, and the water- repellent pattern (20) has: a first pattern portion (21) having an inclination angle and formed in a micro size; and a second pattern portion (22) having an inclination angle between the first pattern portion (21) and formed in a nano size. In addition, by coating a water repellent resin (23, 24) only on a part of a vertex and a valley point of the water repellent pattern (20), a water repellent function is further improved by a coated surface and a non-coated surface having different contact angles.

Description

Technical Field [0001] The present invention relates to a metal surface structure having a super water-repellent property, a system device for forming the metal surface structure, and a method for fabricating the same.

The present invention relates to a metal surface structure, and more particularly, to a metal surface structure having water repellency and water repellency in a desired direction, and a method of forming such a surface structure.

It is well known that improving the wettability of the metal surface can provide a cleaner surface when applied to exterior materials of automobiles and buildings, and can prevent oil loss when applied to an internal combustion engine using oil. Furthermore, when the surface of the heat exchanger employed in a refrigerator or the like is processed to have super water repellency, it is possible to prevent a phenomenon such as condensation and image formation that may occur on the surface of the heat exchanger during driving, thereby improving cooling efficiency and reducing energy consumption You may.

Accordingly, much research has been conducted to improve the super water repellency of the metal surface. For example, very simple techniques can improve the surface properties by forming thin films on metal surfaces. However, such a technique has a problem that the thin film is easily adhered to the surface of the metal because the thin film is adhered to the surface of the metal, so that the thin film is easily separated due to low durability and adhesion, and when the thin film disappears, the hydrophilic property itself disappears, .

As another example, Korean Patent Laid-Open Publication No. 10-2013-0023327 (metal surface structure having super water-repellency / super hydrophilic property) discloses a method of forming an irregularity and a projection on a metal surface and coating the outer side of the projection to provide super- Technology. For example, as shown in FIG. 1, the water repellent material is coated after forming irregularities or protrusions. As another example, Korean Patent No. 10-0854486 (a method of producing a super water-repellent surface) provides a manufacturing method capable of producing a super-super water-repellent surface by forming a hierarchical micro concavo-convex structure on the surface and treating the fluorine compound .

However, the above-described prior arts are complicated and chemical processes are applied to the fabrication of super-water-repellent or super-hydrophilic metal surfaces, resulting in an increase in manufacturing cost and environmental problems. In addition, when fine irregularities are formed on the metal surface, the water repellent material is coated on the irregular surface due to the limit of the water repellency. However, the coating of the water repellent material causes a problem that the water repellent effect due to the micro irregular shape is deteriorated.

Furthermore, although the above-mentioned prior arts have improved superficial properties to realize super water-repellent or super-hydrophilic phenomena, they can not provide a flow direction (directionality) of water droplets formed on a metal surface. If such directionality is not provided, water droplets will not be absorbed into the surface due to the super water repellency, but there will be a difficulty in collecting water because there is no directionality.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a water- To provide a metal surface structure.

Another aspect of the present invention is to provide a method of forming a superfluid-water-repellent metal surface structure which provides a water repellent resin in a line-like water repellent pattern by providing a water repellent resin on the entire surface or a selective coating to further improve water repellency and hydrophilic property.

The present invention will also provide a series of system devices for making such metal surface structures.

In order to achieve the above object, according to the present invention, there is provided a water repellent pattern having a linear shape on one side or both sides of a metal surface, wherein the water repellent pattern has a micro- 1 pattern part and a second pattern part having a nano-sized inclination angle between the first pattern part and collecting or repelling water in a desired direction according to the direction and inclination angle of the water-repellent pattern A water-repellent metallic surface structure is provided.

The first pattern portion has a line width of 10 mu m or less and a depth of 10 mu m or more, and the second pattern portion has a line width of 1 to 3 mu m and a depth of 3 mu m or less.

A coating surface of the water repellent resin is formed only in a part of the first pattern portion and the second pattern portion and a coating surface and a non-coating surface of the water repellent resin are formed on the inclined surfaces of the first pattern portion and the second pattern portion.

The inclined surface is formed with two or more contact angles by the coated surface and the non-coated surface.

According to another aspect of the present invention, there is provided a method of manufacturing a metal material, comprising: a moving step of moving a metal material wound in a coil form on a winding roller at a predetermined speed while unwinding; A processing means provided in at least one of the upper and lower surfaces of the surface of the metal material moving in a loosened state is rotated in contact with the metal surface by a belt rotating system to form a water repellent pattern having a slope on the metal surface Forming a water repellent pattern; A collecting step of collecting fine dust generated when the water repellent pattern is formed; A coating step of coating only a predetermined region of the water repellent pattern using viscosity control of the water repellent resin; And a curing step of thermally curing the coated water repellent resin.

The water repellent pattern is formed of a first pattern portion having a line width of 10 mu m or less and a depth of 10 mu m or more and a second pattern portion having a line width of 1 to 3 mu m and a depth of 3 mu m or less between the first pattern portion According to the coating step, a coating region and an uncoated region are formed on the inclined surface of the water repellent pattern.

The moving speed of the metal material is 0.2 m / min, and the rotating means rotating in a direction opposite to the moving speed of the metal material while being in pressure contact with the metal surface rotates at 38 m / min.

According to still another aspect of the present invention, there is provided a winding apparatus comprising: a winding roller in which a metal is wound in a coil form; A first pattern portion provided on at least one side of a top surface and a bottom surface of the metal surface that is loosened from the take-up roller and moves and is formed in a micro size on the metal surface while rotating in contact with and pressing the metal surface; A processing unit for forming a water repellent pattern composed of a second pattern part formed in a nano size if the first pattern part has an inclination angle; A fine dust collecting part for collecting fine dust generated when the water repellent pattern is formed; A coating unit coating a water repellent resin only on a predetermined area of the water repellent pattern; A thermosetting part for curing the coated water repellent resin; And a collecting roller for collecting the metal in which the water repellent pattern is formed in a coil form.

Here, the processing means is a sandpaper having a grain size of # 180 to # 220, and contacts the metal surface while rotating in a belt type to form a water repellent pattern.

According to the present invention as described above, a water repellent pattern having a line-shaped micro-sized pattern shape and a nano-sized pattern shape is formed on the metal surface. The water repellent pattern is formed to have a constant inclination angle. Therefore, when water droplets are formed on the metal surface, water droplets can be repelled and collected in a desired direction along the line-shaped water repellent pattern.

Further, the water repellent resin is coated only on a part of the water repellent pattern, for example, in the nip area or the bony area of the water repellent pattern, so that the coated surface and the non-coated surface are formed in a mixed state on one inclined surface. As a result, since two or more different contact angles are formed on the inclined surfaces, the effect of further improving the water-repellent function can be expected.

In the present invention, a water repellent pattern having different sizes is formed on a metal surface moving at a predetermined speed by a simple process while rotating a sandpaper, which is a processing means for making a press contact with a metal surface, by a belt rotation method, and unnecessary chemical processes can be eliminated It is possible to prevent the manufacturing cost from being reduced and environmental problems.

According to the metal surface structure of the present invention, since the metal surface structure of the present invention can be widely applied to a heat exchanger such as an air conditioner or a refrigerator, a dehumidifier, a solar heat collecting plate, a thermal insulating material for buildings or a wallpaper, There is an expectation that can be saved.

FIG. 1 is a view showing a metal surface structure showing a state coated with a water repellent agent after unevenness or protrusion is formed according to the prior art
2 is a perspective view showing a metal surface structure of super water-repellent characteristics according to an embodiment of the present invention.
Fig. 3 is an enlarged view of the metal surface shown in Fig. 2
4 is a cross-sectional view of a metal surface coated with a water-repellent resin according to an embodiment of the present invention
5 is a schematic view showing a system device for forming a metal surface according to the present invention

Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

As shown in FIGS. 2 and 3, when the metal surface 10 of the present invention is viewed, a water repellent pattern 20 having a line-like and directional irregular shape is formed. The water-repellent pattern 20 is normally in the form of continuously connecting mountains and valleys. The water repellent pattern 20 includes a first pattern portion 21 and a second pattern portion 22 inside the first pattern portion 21. That is, the second pattern portion 22 is formed between the first pattern portions 21. The first pattern portion 21 and the second pattern portion 22 have the same shape but different sizes. According to the present embodiment, the first pattern portion 21 and the second pattern portion 22 are formed in the same pattern, A large size is formed.

The structure of the water repellent pattern 20 is further described as follows: the first pattern portion 21 is a micro size and the second pattern portion 22 is a nano size. In this embodiment, the first pattern portion 21 has a line width of 10 mu m or less and a depth of 10 mu m or more. The second pattern portion 22 has a line width of 1 to 3 占 퐉 and a depth of 3 占 퐉 or less.

According to this structure, water droplets are collected along the directionality of the first pattern portion 21 and the second pattern portion 22 (that is, the vertical direction in FIG. 2), and in the opposite direction to the vertical direction The water repellency phenomenon occurs in the horizontal direction). The process of forming the first pattern portion 21 and the second pattern portion 22 will be described later.

The present invention includes a structure for further improving the water-repellent function by coating the water-repellent pattern (20) formed on the metal surface (10) with the water-repellent resin (23, 24). Such an example will be described with reference to FIG.

Fig. 4 shows a state in which only a part of the inclined surface is coated in the water-repellent pattern 20. 4 (a) shows a state in which the water repellent resin 23 is coated only on the vertex of the water repellent pattern 20, and FIG. 4 (b) shows a state in which the water repellent resin 24 is coated only on the vertex of the water repellent pattern 20 .

In this way, the surface coated with the water-repellent resin (23, 24) on one inclined surface and the uncoated surface without the water-repellent resin (23, 24) can be mixed. That is, in (a), the water repellent resin 23 is coated only on the top portion of the water repellent pattern 20, and the uncoated bottom portion is maintained. Similarly, in (b), when one sloped surface of the water repellent pattern 20 is viewed, only the bottom point of the sloped surface is coated with the water repellent resin 24, and the upper portion remains uncoated.

When the inclined surfaces of the water repellent pattern 20 are formed together with the coating surface and the non-coated surface, the contact angles of the water repellent patterns 20 are different from each other, which improves the water repellent function. In other words, the water repellent function can be further enhanced as compared to coating the entire surface of one inclined surface. In the prior art, a water repellent resin is coated on a metal surface having no inclination. In contrast to this structure, the present embodiment in which the water repellent pattern 20 is inclined and the coated surface and the uncoated surface coexist on one inclined surface is further improved It is natural that water repellency can be provided.

As described above, the coating surface can be formed only on a part of the water repellent pattern 20 by adjusting the viscosity of the water repellent resin 23, 24. That is, the shape of the water repellent pattern 20 and the surface tension of the liquid repellent resin 23, 24. For example, the solid content of the water-repellent material can be controlled by adjusting the solid content of the water-repellent material to within 0.05 to 2 wt%.

Next, a process of forming the water repellent pattern 20 on the metal surface 10 will be described. 5 shows a system arrangement 100 for forming a water repellent pattern 20 on a metal surface 10 in accordance with an embodiment of the present invention. In this regard, aluminum is used for the metal material used in this embodiment, and aluminum is supplied in a roll to roll manner. That is, the aluminum wrapped around the left winding roller 110 in the drawing is the raw material, and the aluminum wrapped around the right collecting roller 160 is the product with the water repellent pattern 20 formed. Further, the aluminum material is moved by 0.2 m (0.2 m / min) per minute while being unwound from the winding roller 110 by a drive means not shown.

Processing means (120a, 120b) for forming the water repellent pattern (20) on the aluminum surface (10) of the raw material is provided. Here, the processing means 120a and 120b are dry type sandpaper made of wood or silicon carbide, and the size (roughness of the sandpaper) # 180 to # 220 is used. In addition, the processing means 120a and 120b are belt-type, configured to continuously rotate via a driven shaft and a driven shaft, and in particular, in a state of being pressed against an aluminum material moving in a plane in a vertical direction, So that a water repellent pattern is formed on the aluminum surface 10. Here, the rotation speed of the processing means 120a and 120b is rotated at 38 m / min. The water repellent pattern 20 formed on the aluminum surface 10 has a micro size and a nano size as shown in FIG. 3 according to the contact with the processing means 120a and 120b.

5, the above-mentioned processing means 120a and 120b form water repellent patterns 20 on both surfaces of the aluminum surface 10 while being provided on the upper and lower surfaces of the aluminum surface 10, respectively. However, the water repellent pattern 20 may be formed on only one side of the aluminum surface 10. In this case, the processing means 120a and 120b may be provided only on one side of the aluminum material. At this time, the processing means 120a and 120b may be installed to correspond to each other with the aluminum material interposed therebetween. Alternatively, as shown in the drawing, the water repellent pattern 20 may be first formed on the upper surface and then the water repellent pattern 20 may be formed on the lower surface have.

Fine dust collecting parts 130a and 130b are provided on the rear side of the processing means 120a and 120b. The fine dust collecting parts 130a and 130b collect fine dust and aluminum scum that are generated when the processing means 120a and 120b are driven to form the water repellent pattern 20. The fine dust collecting units 130a and 130b are installed in correspondence with the processing means 120a and 120b.

Coating portions 140a and 140b are provided on the rear side of the fine dust collecting portions 130a and 130b. The coating portions 140a and 140b serve to coat the water repellent resins 23 and 24 at predetermined points on the water repellent pattern 20 formed on the aluminum surface 10, Is sprayed. These water-repellent resins 23 and 24 are silicone type and the dilution concentration of the fluorine solvent is 0.2 wt%.

In addition, thermosetting units 150a and 150b for curing the water repellent materials 23 and 24 coated on the coating units 140a and 140b to a predetermined temperature are also provided.

The fine dust collecting units 130a and 130b, the coating units 140a and 140b and the thermosetting units 150a and 150b are also connected to the processing units 120a and 120b, Only.

In the drawings, reference numerals 101, 102, 103 and 104 denote support rollers which are installed to support a moving aluminum material or to provide an adhesion force.

In order to form the water repellent pattern 20 on the aluminum surface 10 in such a system device 100, first, the aluminum coil wound around the take-up roller 110 is unwound at a predetermined speed, for example, at a speed of 0.2 mm per minute . In addition, the processing means 120a and 120b rotate at a speed of 38 m / min. At this time, the processing means 120a and 120b rotate in the reverse direction with respect to the moving direction of the aluminum material. According to this operation, the water repellent pattern 20 is formed on the aluminum surface 10 while the processing means 120a and 120b pressurize.

The water-repellent pattern 20 refers to a state in which a micro-sized first pattern portion 21 and a nano-sized second pattern portion 22 formed between the first pattern portion 21 are formed together. When the sandpaper as the processing means 120a and 120b is in contact with the aluminum surface 10 in a pressurizing manner and the sandpaper and the aluminum surface 10 are driven at different speeds and directions, The water repellent pattern 20 including the first pattern portion 21 and the second pattern portion 22 is formed.

After the water repellent pattern 20 is formed, the fine dust collecting units 130a and 130b collect the fine dust generated when the water repellent pattern 20 is formed. When the processing means 120a and 120b are provided on the upper and lower portions of the aluminum material as shown in the drawing, the fine dust collecting portions 130a and 130b are provided immediately behind the moving means 120a and 120b.

After the fine dust is collected, the coating portions 140a and 140b spray the oscillating resin 23 and 24 to coat predetermined portions of the inclined surface. Here, the coating portions 140a and 140b may be coated on the entire surface of the inclined surface, or may be coated only on a portion corresponding to the upper region corresponding to the tip of the inclined surface or the lower region corresponding to the valley. Such a coating method is practically possible by controlling the viscosity of the water repellent resin (23, 24).

In this case, the coated portion and the uncoated portion may be formed on one inclined surface, so that the respective contact angles of the coated portion and the uncoated portion have different values. And, having different contact angles on one inclined surface means that water repellency performance can be improved compared to a structure providing the same contact angle on one inclined surface.

After the spraying of the water-repelling resins 23 and 24 and coating is performed, the thermosetting parts 150a and 150b cure the water-repelling resins 23 and 24 at a predetermined temperature, The finished aluminum is completed by rewinding on the collecting roller 160.

As described above, according to the present invention, the water repellent pattern is formed in a desired direction by forming a linear water repellent pattern having a directionality on a metal surface such as aluminum. In addition, the water repellent pattern includes a water repellent resin coated region and an uncoated Regions are formed together, so that it is possible to further improve the water-repellent function.

The metal surface structure according to the embodiment of the present invention can be widely applied to a heat exchanger, a dehumidifier, a solar heat collecting panel, and the like, which are used for an air conditioner, a refrigerator,

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent that modifications, variations and equivalents of other embodiments are possible. Therefore, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: metal (surface)
20: Water repellent pattern
21: first pattern portion 22: second pattern portion
23,24: Water repellent resin
110: take-up roller
120: Processing means
130: Fine dust collecting part
140: Coating portion
150: Thermal hardening part
160: Collection roller
101, 102, 103, 104: support rollers

Claims (9)

A water repellent pattern 20 is formed on one or both surfaces of the metal surface 10 in a linear shape,
The water repellent pattern 20 includes a first pattern portion 21 having an inclination angle and formed in a micro size and a second pattern portion 21 having an inclination angle between the first pattern portion 21 and a nano- 2 pattern portion 22,
Characterized in that water is collected or repelled in a desired direction according to the direction and inclination angle of the water repellent pattern (20). The method according to claim 1,
The first pattern portion 21 has a line width of 10 mu m or less and a depth of 10 mu m or more,
The second pattern portion (22) has a line width of 1 to 3 탆 and a depth of 3 탆 or less. The method according to claim 1,
The coating surface of the water repellent resin 23 or 24 is formed only in a part of the first pattern part 21 and the second pattern part 22 so that the first pattern part 21 and the second pattern part 22 ) Is formed on the inclined surface of the water repellent resin (23, 24) together with the coating surface and the non-coated surface. The method of claim 3,
The metal surface structure of super water-repellent characteristics wherein one inclined surface has two or more contact angles due to the coated surface and the non-coated surface. A moving step of moving the metal material wound in the form of a coil on the take-up roller (110) while moving at a predetermined speed;
The processing means 120 installed in at least one of the upper surface and the lower surface of the metal surface 10 moving in the unfolded state rotates while being in contact with the metal surface 10 by the belt rotation system, A water repellent pattern forming step of forming a water repellent pattern (20) having a slope with respect to the water repellent pattern (20);
A collecting step of collecting fine dust generated when the water-repellent pattern 20 is formed;
A coating step of coating only a predetermined region of the water repellent pattern (20) using viscosity control of the water repellent resin (23, 24); And
And a curing step of thermally curing the coated water repellent resin (23, 24). 6. The method of claim 5,
The water repellent pattern (20)
A first pattern portion 21 having a line width of 10 mu m or less and a depth of 10 mu m or more,
A second pattern portion 22 having a line width of 1 to 3 탆 and a depth of 3 탆 or less between the first pattern portions 21,
And a coating region and an uncoated region are formed on the inclined surface of the water repellent pattern (20) according to the coating step. 6. The method of claim 5,
The moving speed of the metal material is 0.2 m / min. The machining means (120) rotating in a direction opposite to the moving speed of the metal material while being in pressure contact with the metal surface (10) ≪ / RTI > A winding roller (110) in which a metal is wound in a coil shape;
(10) provided on at least one side of an upper surface and a lower surface of a metal surface which is unwound from the take-up roller (110) and rotates in contact with and pressurized the metal surface (10) A water repellent pattern 20 composed of a first pattern portion 21 formed in a micro size and a second pattern portion 22 formed in a nano size having an inclination angle between the first pattern portions 21, A processing means (120) for forming a substrate;
A fine dust collecting part 130 for collecting fine dust generated when the water repellent pattern 20 is formed;
A coating part 140 coating the water repellent resin 23 and 24 on only a predetermined area of the water repellent pattern 20;
The thermosetting portion 150 for curing the coated water repellent resin 23, 24; And
And a collecting roller (160) for collecting the metal in which the water repellent pattern (20) is formed in a coil form. 9. The method of claim 8,
Wherein the processing means (120) is a sandpaper having a grain size of from 180 to 220 and forms a metal surface that contacts the metal surface (10) while rotating in a belt type to form a water repellent pattern (20).

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