KR20160084952A

KR20160084952A - Super hydrophobic mirror having excellent durability and the method of manufacturing the same

Info

Publication number: KR20160084952A
Application number: KR1020150001372A
Authority: KR
Inventors: 박성준
Original assignee: 현대자동차주식회사
Priority date: 2015-01-06
Filing date: 2015-01-06
Publication date: 2016-07-15

Abstract

The present invention relates to a super-water-repellent mirror having excellent durability and a method for manufacturing the super-water-repellent mirror, and more particularly, to a nanostructure layer 300 including a nanostructure 310 formed at an upper end of the glass 100; A hydrophobic coating layer 400 formed on the top of the nanostructure layer 300; And a metal coating layer (500) formed on the lower end of the glass (100); The optical properties of the mirror can be maintained at a low cost without loss of visible light transmittance and the wettablility of the glass surface can be controlled through surface treatment techniques such as controlling the width and height of the nanostructure And moreover, to a super water-repellent mirror capable of improving durability against an external impact such as friction, and a manufacturing method thereof.

Description

TECHNICAL FIELD [0001] The present invention relates to a super-water-repellent mirror having excellent durability and a method for manufacturing the super-

The present invention relates to a super water-repellent mirror having excellent durability and a method for manufacturing the super-water-repellent mirror, and more particularly to an super-water-repellent mirror excellent in durability that can withstand the harsh environment while maintaining the optical characteristics of the mirror.

Water repellency is a property that is hard to get wet with water. The super-water-repellent surface technology is a field of surface modification technology for controlling the wetting phenomenon of a surface. The surface of a solid is physically or chemically surface-modified to have a contact angle of 150 °.

Generally, the surface wettability of the material is classified into four types such as hydrophilic, super hydrophilic, water-repellent, and super-water-repellent due to the contact angle with water. So far, studies on hydrophilic and water repellent coatings have been actively carried out. However, superfine water having a contact angle of 10 ° or less and super water repellency having a contact angle of 150 ° or more have technological limitations that are difficult to realize with a simple surface coating alone.

However, as nanotechnology, which synthesizes, assembles, and controls materials at small sizes such as atomic or molecular, has developed, it has become possible to regularly arrange microscopic scale structures on the surface. In the Wenzel and Cassie models As described above, techniques for realizing a super-hydrophilic and super-water-repellent surface by applying fine roughness to the surface have been actively studied.

Certain types of biological leaf surfaces exhibit superhydrophobic surface properties due to the presence of multi-scale nano / micro composite structures, which is well known as the lotus effect. The superfluid surface science of soft petals was first described by Barthlott of Germany in 1997. The surface of the soft petals is micrometer-level cells and a randomly distributed size of 0.3-1.1 μm It is made of water repellent wax material.

The water droplets on the surface of the soft petal can not penetrate through the fine structures having water repellency, and there is a fine air pocket between the water droplets and the surface. Thus, the water droplets on the surface are automatically rolled along the surface, resulting in the removal of fine dust and particles from the surface of the soft petals.

Because of the high moldability required in the microfabrication process, the fabrication of such a super water-repellent surface is made using an organic polymer, and the prepared super-hydrophilic / super-water-repellent organic polymer film is also used as a method of adhering to a substrate to be used.

This super-hydrophilic / super water-repellent functional surface is easy to use for building materials, protective glass for solar cell, display, automobile glass and the like due to its self-cleaning ability. However, the super water-repellent film based on organic polymer is excellent in automobile, It was impossible to apply it to a glass material or the like.

Other techniques for obtaining a super-water-repellent surface include lithography, electro-deposition, and colloidal systems that utilize semiconductor equipment.

In the lithography system, it is possible to regularly manufacture fine scale structures on the surface, but it requires expensive semiconductor equipment and a process procedure requiring a long time. The electrospinning system and the particle utilization system, which have advantages in terms of processability, were not easy to fabricate the micro complex structures required for the super water repellency.

In particular, conventional coating techniques for improving the visibility of mirrors include a multilayer deposition method of inorganic materials through a deposition method and a technique of hydrophilizing the surface by solution coating a hydrophilic hydrogel. This is because the wavelength of light transmitted through the surface of the glass The amount of light is changed to finally affect the optical characteristics of the mirror, and the function of the mirror is deteriorated. In addition, there is a problem in that it is impossible to apply to a vehicle or a building mirror requiring high durability due to lack of material stability.

Accordingly, the present inventors have developed a super water-repellent mirror having excellent durability that can withstand the harsh environment while maintaining the optical characteristics of the mirror at low manufacturing cost, and a method for manufacturing the super-water-repellent mirror.

Patent Registration No. 10-1280710 (registered on June 25, 2013)

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a nanostructure layer, a hydrophobic coating layer and a metal coating layer, And an object of the present invention is to provide an excellent super water-repellent mirror and a manufacturing method thereof.

According to an aspect of the present invention, there is provided a super-water-repellent mirror comprising: a nanostructure layer including a nanostructure formed on an upper end of a glass; A hydrophobic coating layer formed on an upper end of the nanostructure layer; And a metal coating layer formed on the lower end of the glass; And the like.

The distance between the nanostructures is preferably about 10 to 500 nm, and the width of the nanostructure is preferably about 10 to 500 nm.

In addition, the height of the nanostructure is preferably about 50 to 1000 nm, and the thickness of the hydrophobic coating layer is preferably about 10 to 500 nm.

According to another aspect of the present invention, there is provided a method of manufacturing a super-water-repellent mirror, comprising: forming a mask layer by attaching nanoparticles to a top of a glass at predetermined intervals; A second step of selectively etching a glass exposed portion in which the nanoparticles are not adhered in the mask layer to form a nanostructure layer including the nanostructure; A third step of removing the mask layer from the upper end of the formed nanostructure layer; A fourth step of forming a hydrophobic coating layer including a hydrophobic material on the upper end of the nanostructure layer; And a fifth step of forming a metal coating layer on the lower end of the glass for reflection of light; And the like.

In addition, it is preferable that the height of the nanostructure is about 50 to 1000 nm, and the thickness of the hydrophobic coating layer is about 10 to 500 nm.

As described above, the present invention having the above-described structure can maintain the optical characteristics of a mirror without loss of visible light transmittance and can form nanostructures and the like through a low cost masking and etching process, Can be saved.

In addition, the glass surface on which the nanostructure is formed can form a super hydrophilic surface having a low contact angle, and a surface coated with the hydrophobic material on the nanostructure can form a super water-repellent surface having a high contact angle.

In addition, the wettability of the glass surface can be controlled through the surface treatment technique such as the adjustment of the width and height of the nanostructure, and the durability against external impact such as friction can be improved.

1 is a cross-sectional view of a super water-repellent mirror having excellent durability according to the present invention.
2 is an enlarged cross-sectional view of the nanostructure.
3 is an atomic force microscopy (AFM) photograph of a nanostructure.
4 is a photograph showing the contact angle of the nanostructure with respect to water when only the nanostructure layer is present on the upper end of the glass.
FIG. 5 is a photograph showing the contact angle of the hydrophobic coating layer with respect to water when the hydrophobic coating layer is present on the top of the nanostructure layer.
6 is a process diagram showing a method of manufacturing an ultra-water-repellent mirror according to the present invention.
FIG. 7 is a photograph showing the surface characteristics of the super-water-repellent mirror manufactured according to the present invention having excellent durability.
8 is a photograph showing the surface of the comparative example after the abrasion resistance test.
9 is a photograph showing the contact angle of water on the surface of the comparative example after the abrasion resistance test.
10 is a photograph showing the surface of the example after the abrasion resistance test.
11 is a photograph showing the contact angle of water on the surface of the example after the abrasion resistance test.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings and the like. The present invention relates to a super water-repellent mirror having excellent durability and a method of manufacturing the same, and in particular, the present invention relates to a super water-repellent mirror having excellent durability.

1 is a cross-sectional view of a super water-repellent mirror having excellent durability according to the present invention. As shown in FIG. 1, a super-water-repellent mirror having excellent durability according to the present invention includes a nanostructure layer 300 including a nanostructure 310 formed on an upper portion of a glass 100; A hydrophobic coating layer 400 formed on the top of the nanostructure layer 300; And a metal coating layer (500) formed on the lower end of the glass (100); And the like.

More specifically, FIG. 2 is an enlarged cross-sectional view of the nanostructure 310, and FIG. 3 is an atomic force microscopy (AFM) photograph of the nanostructure 310. As shown in the figure, the nanostructure 310 is a nano protrusion. The distance a between the nanostructures 310 is preferably about 10 to 500 nm, and more preferably about 30 to 80 nm . If the spacing a between the nanostructures 310 is less than about 10 nm, the hydrophobic material can not penetrate into the structures and the super water-repellent characteristics may deteriorate. When the distance a between the nanostructures 310 is about When the thickness exceeds 500 nm, there is a problem that the durability characteristics of the glass against external friction may deteriorate.

The width (b) of the nanostructure 310 is preferably about 10 to 500 nm. If the width (b) of the nanostructure 310 is less than about 10 nm, durability and super water-repellency may be deteriorated. If the width (b) of the nanostructure 310 is more than about 500 nm, There is a problem that the nanostructure 310 may affect the transmittance of the visible light.

In addition, the height (c) of the nanostructure 310 is preferably about 50 to 1000 nm. If the height c of the nanostructure 310 is less than about 50 nm, the superfluidity of the glass may be deteriorated. If the height c of the nanostructure 310 is more than about 1000 nm, There is a problem that the transmittance of the visible light can be influenced.

In addition, the hydrophobic coating layer 400 preferably includes a hydrophobic material, and any hydrophobic material known in the art may be used. The thickness d of the hydrophobic coating layer 400 is preferably about 10 to 500 nm. When the thickness d of the hydrophobic coating layer 400 is less than about 10 nm, it may be difficult to ensure sufficient durability. When the thickness d of the hydrophobic coating layer 400 is more than about 500 nm, There is a problem that can cause.

On the other hand, in the structure of the super-water-repellent mirror having excellent durability according to the present invention, if the hydrophobic coating layer 400 is absent, the super-water-repellent property can be replaced with a mirror having super-hydrophilic properties. , A glass having a superhydrophilic property instead of a mirror. Similarly, if the metal coating layer 500 is not provided in the structure of the super-water-repellent mirror having excellent durability, it can be a glass having super water-repellent properties.

That is, the nanostructure layer 300 formed on the upper end of the glass 100 has a super-hydrophilic property, but has a super water-repellent property by the hydrophobic coating layer 400 formed on the upper end of the nanostructure layer 300. In addition, the glass is characterized by a mirror by the metal coating layer 500 formed at the lower end of the glass 100.

4 is a photograph showing the contact angle α of the nanostructure 310 with respect to water when the nanostructure layer 300 is present only on the upper end of the glass 100. FIG. Is a photograph showing the contact angle (?) Of the hydrophobic coating layer (400) with respect to water when the hydrophobic coating layer (400) is present on the upper end of the hydrophobic coating layer (400).

As shown in FIG. 4, the contact angle alpha of the nanostructure layer 300 having superhydrophilic characteristics with respect to water is preferably about 0 to 20 degrees, and as shown in FIG. 5, It is preferable that the hydrophobic coating layer 400 located at the upper end of the nanostructure layer 300 has a contact angle β with respect to water of about 100 to 160 °. In addition, the visible light transmittance of the glass 100 on which the nanostructures 310 are formed is preferably about 85 to 99%.

The super-water-repellent mirror according to the present invention having such a configuration and characteristics as described above is preferably used in automobiles, architectural, interior and advertising fields, and more preferably used in a side mirror and a room mirror of an automobile .

Hereinafter, from another aspect, the present invention relates to a method of manufacturing a super water-repellent mirror having excellent durability.

6 is a process diagram showing a method of manufacturing an ultra-water-repellent mirror according to the present invention. 6, a method of manufacturing a super-water-repellent mirror having excellent durability according to the present invention includes forming a mask layer 200 by attaching nanoparticles 210 at a predetermined interval to the upper end of the glass 100 A first step (10); A second step of selectively etching the glass exposed portion 110 to which the nanoparticles 210 are not attached is formed in the mask layer 200 to form the nanostructure layer 300 including the nanostructures 310. Step 20; A third step (30) of removing the mask layer (200) from the upper end of the formed nanostructure layer (300); A fourth step (40) of forming a hydrophobic coating layer (400) including a hydrophobic material on the upper end of the nanostructure layer (300); And a fifth step (50) of forming a metal coating layer (500) for reflecting light on the lower end of the glass (100); And the like. The contact angle? Of water on the surface of the super-water-repellent mirror manufactured by such a method is preferably about 100 to 160 °.

The distance a between the nanostructures 300 is preferably about 10 to 500 nm in consideration of the transparency of the visible light of the mirror and the super water repellency and durability as described above, The width b of the nanostructure 300 is preferably about 10 to 500 nm and the height c of the nanostructure 300 is about 50 to 1000 nm.

The properties of the glass such as hydrophilicity or water repellency can be controlled according to the distance a between the nanostructures 310 and the width b and height c of the nanostructure 310. More specifically, the distance a between the nanostructures 310 is determined according to an interval e at which the nanoparticles 210 adhere to the upper end of the glass 100 in the first step 10, The width b and the height c of the structure 310 are determined by the size of the nanoparticles 210 attached to the upper end of the glass 100 in the first step 10 and the degree of the etching in the second step 20 .

The fourth step 40 of forming the hydrophobic coating layer 400 may be omitted in the above manufacturing method and thus the hydrophobic coating layer 400 may be formed only in the first to third steps 30, The mirror has a super-hydrophilic property instead of the super water-repellent property. In this case, the contact angle? With respect to water is preferably about 0 to 20 degrees.

The hydrophobic coating layer 400 may have a thickness d of about 10 to 500 nm. The hydrophobic coating layer 400 may be formed by any method known in the art, beam coating method, a spray coating method using a solution, a flow coating method, or a spin coating method.

[Example]

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and that the scope of the present invention is not construed as being limited by these embodiments.

FIG. 7 is a photograph showing the surface characteristics of the super-water-repellent mirror manufactured according to the present invention having excellent durability. As shown in the figure, it was confirmed that when water is supplied to the surface of the mirror having a contact angle with respect to water of 100 ° or more, water droplets do not flow and are removed. Also, it was confirmed that the super water - repellent surface treatment of the mirror did not affect the optical characteristics of the mirror surface.

An example having a gap between nanostructures of 50 nm prepared according to the method of manufacturing a super-water-repellent mirror having excellent durability according to the present invention, and a comparative example having a gap between nanostructures of 550 nm, Were subjected to abrasion resistance test.

As a result of the abrasion resistance test, as shown in FIG. 8, the surface of the comparative example was crushed and it was difficult to find the nanostructure. As shown in FIG. 9, the contact angle γ with respect to water was considerably reduced to about 60 ° I could.

On the other hand, as shown in FIG. 10, as shown in FIG. 11, the contact angle (?) With respect to water was 127 °, and the contact angle of the pre-water repellency was 120 ° .

Therefore, it was confirmed that the super-water-repellent mirror having excellent durability according to the present invention maintains the optical characteristics and is excellent in abrasion resistance and super water-repellent property.

Although the present invention has been described in connection with the specific embodiments of the present invention, it is to be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Various modifications and variations are possible.

10: first step alpha: contact angle
20: Step 2?: Contact angle
30: Third Step γ: Contact angle
40: fourth step?: Contact angle
50: Step 5 a: spacing between nanostructures
100: glass b: width of nano structure
110: glass exposed part c: height of nano structure
200: mask layer d: thickness of hydrophobic coating layer
210: nanoparticle e: interval in which nanoparticles are attached
300: nanostructure layer
310: nanostructure
400: hydrophobic coating layer
500: metal coating layer

Claims

A nanostructure layer 300 including a nanostructure 310 formed on an upper end of the glass 100;
A hydrophobic coating layer 400 formed on the top of the nanostructure layer 300; And
A metal coating layer 500 formed on the lower end of the glass 100;
Characterized in that it comprises a super-water-repellent mirror.

The method according to claim 1,
Wherein an interval (a) between the nanostructures (310) is 10 to 500 nm.

The method according to claim 1,
Wherein the width (b) of the nanostructure (310) is 10 to 500 nm.

The method according to claim 1,
Wherein the height (c) of the nanostructure (310) is 50 to 1000 nm.

The method according to claim 1,
Wherein the hydrophobic coating layer (400) has a thickness (d) of 10 to 500 nm.

A first step of forming a mask layer 200 by attaching nanoparticles 210 to an upper end of the glass 100 at predetermined intervals;
A second step of selectively etching the glass exposed portion 110 to which the nanoparticles 210 are not adhered is formed in the mask layer 200 to form the nanostructure layer 300 including the nanostructures 310. step;
A third step of removing the mask layer 200 from the upper end of the formed nanostructure layer 300;
A fourth step of forming a hydrophobic coating layer 400 including a hydrophobic material on the upper end of the nano structure layer 300; And
A fifth step of forming a metal coating layer 500 for reflecting light on the lower end of the glass 100;
The method of manufacturing an ultra-water-repellent mirror according to claim 1,

The method according to claim 6,
Wherein a distance (a) between the nanostructures (310) is 10 to 500 nm.

The method according to claim 6,
Wherein the width (b) of the nanostructure (310) is 10 to 500 nm.

The method according to claim 6,
Wherein the height (c) of the nanostructure (310) is 50 to 1000 nm.

The method according to claim 6,
Wherein the hydrophobic coating layer (400) has a thickness (d) of 10 to 500 nm.