JPH0442835A - Functional glass - Google Patents

Abstract

PURPOSE:To obtain a functional glass able to be surely and quickly defogged by passing electric current and to obtain a glass for shielding electromagnetic wave by applying an electrically conductive thin mesh film having a specific dimension and shape on the surface of a transparent glass, thereby forming an electrically conductive glass. CONSTITUTION:The objective functional glass is an electrically conductive glass 3 produced by applying an electrically conductive thin mesh film on the surface of a transparent glass l. The mesh film 2 has a thickness of from 100Angstrom to 50mum, a line width (a) of a side of the mesh of 40-400mum, a mesh opening (b) of 250-5,000mum and an opening ratio of 70-90%. Although the electrically conductive thin mesh film 2 can be formed by directly printing a mesh pattern on a surface of glass 1 with an electrically conductive ink, it is preferably produced by forming an electrically conductive thin film 2a on the glass surface and opening holes on the film to form a mesh pattern. The electrically conductive thin film 2a is preferably produced by vacuum film-forming process such as sputtering and vacuum evaporation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a functional glass having antifogging properties and/or electromagnetic shielding properties.

Conventional techniques To prevent glass and mirrors from weighing, there are methods such as blowing hot air to raise the surface temperature, coating with water repellent such as silicone or fluororesin, and coating with an aqueous solution of surfactant such as soapy water. A method of improving the wettability of the surface by using a water-absorbing film, and a method of attaching a water-absorbing film using an adhesive are known.

As a more reliable method to prevent weighing, a method has been adopted in which electricity is applied to a nichrome wire sealed in the glass to raise the temperature of the glass surface.

Problems to be Solved by the Invention Of the above-mentioned anti-fog methods, the method of blowing hot air onto the surface of the glass to raise the surface temperature has no anti-fog effect when the outside air is very cold, such as on the windows of a vehicle running in a cold region. There is also the problem that the glass surface becomes dirty due to the lack of water and dust in the air.

Coating with a water repellent agent tends to leave water droplets on the surface, and can also create an oil film that obstructs visibility.

Methods of improving surface wettability by applying an aqueous solution of a surfactant such as soapy water have poor sustainability and must be applied frequently, and if the glass surface is dirty, it may cause uneven visibility. There are disadvantages such as the fact that it is easy to prevent

The method of attaching a water-absorbing film using an adhesive has problems such as the adhesive tends to leave spots, the adhesive tends to wrinkle, and the adhesive tends to yellow.

On this point, the method of heating the glass surface by applying electricity to a nichrome wire sealed in the glass can reliably prevent weighing, but
Since the nichrome wire is visible, its presence is a concern, and the nichrome wire has the disadvantage of obstructing visibility.If the distance between the nichrome wires is widened to improve visibility, the anti-fog property will be impaired. Become. Another problem is that even if nichrome wires are enclosed at appropriate intervals, the cloudiness near the nichrome wires can be removed quickly, but it takes some time to remove the haze in the middle of adjacent nichrome wires. be.

In view of this situation, the present invention provides functional glass that can be weighed and removed reliably and quickly using an energizing method.
Furthermore, it is an object of the present invention to provide a functional glass that can be used as electromagnetic shielding glass for other purposes.

Means for Solving the Problems The functional glass of the present invention has a transparent glass (1) with a thickness of 100 Å to 50 μm and a line width of 40 to 40 μm on one side of the mesh.
It is made of a conductive glass (3) provided with a conductive reticular thin film (2) having a mesh size of 0 μm, a mesh unit size of 250 to 5000 μm, and a porosity of 70 to 90%.

The present invention will be explained in detail below.

The functional glass of the present invention has a conductive reticular thin film (2) provided on the surface of a transparent glass (1).

The conductive reticular thin film (2) is formed by printing a reticular pattern directly on the surface of the glass (1) using conductive ink. It can also be formed by transferring a net-like pattern onto the surface of the glass (1).

However, the surface of the glass (1) is first coated with a conductive thin film (
The method of forming 2a) and then opening it in a net shape is preferably adopted.

Here, the conductive thin film (2a) is suitably formed by a vacuum thin film forming method such as a sputtering method, a vacuum evaporation method, an ion implantation method (including an ion blating method), and in some cases, a method of pasting metal foil. can also be adopted.

Examples of the material of the conductive thin film (2a) include, but are not limited to, aluminum, nickel, stainless steel, copper, silver, indium, tin, and ITO.

The formed conductive thin film (2a) is opened in a net shape through steps such as installing a resist film, exposure, development, etching, and peeling off the resist film, and becomes a conductive net-like thin film (2). The shape (pattern) of the conductive net-like thin film (2) may be a regular hexagon, a regular triangle, a regular square, a rectangle, a circle, a sector, or a combination thereof.

The thickness of the conductive reticular thin film (2) is set to at least 100 A to ensure electrical conductivity or electromagnetic shielding properties, and at most 50 μm to ensure transparency and smoothness. A particularly preferred thickness is 150 Å to 30 μm. Note that when the purpose is to shield electromagnetic waves, the thickness of the conductive net-like thin film (2) is desirably 1500 Å or more. Further, when the conductive thin film (2a) is formed by a vacuum thin film forming method, the upper limit of the thickness is usually about 1000 OA due to manufacturing cost constraints.

The line width of one side of the mesh of the conductive reticular thin film (2) is 40 to 400
μm (preferably 50 to 300 μm), and the size of one mesh unit is 250 to 5000 μm (preferably 10
0 to 4000 μm), and the porosity is set to 70 to 4000 μm.
Set at 90% (preferably 75-85%).

When the line width is smaller than the above range, sufficient electrical conductivity or electromagnetic shielding properties cannot be ensured, and when the line width is larger than the above range, there is a disadvantage in terms of transparency.

When the size of one mesh unit is smaller than the above range, transparency is impaired, and when it is larger than the above range, sufficient electrical conductivity or electromagnetic shielding properties cannot be ensured. When the porosity is less than 70%, transparency is impaired, and when the porosity exceeds 90%, electrical conductivity or electromagnetic shielding properties are impaired.

The transparent functional glass of the present invention has a structure in which a conductive reticular thin film (2) is provided on the surface (one or both surfaces) of a transparent glass (1).
Exposing 2) may be undesirable depending on the application.

Therefore, in such cases, the above conductive glass (3)
It is preferable to provide a single-layer or multi-layer protective layer (4) on the surface on which the conductive reticular thin film (2) is installed. The protective layer (4) is usually transparent, but in some cases it may be opaque or light-reflective.

Here, as the protective layer (4), an organic material layer or an inorganic material layer having electrical insulation properties is used. A protective layer (4) is placed on the conductive reticular thin film (2) installation surface of the conductive glass (3).
), those provided with a clear coating layer, those provided with an antifogging resin layer, and those provided with a protective glass (4b) via a photocurable resin layer (4a) are examples of preferred embodiments. be.

In addition, if high temperature conditions exceeding a certain limit are adopted when installing the protective layer (4), damage such as peeling or cuts may occur to the conductive reticular thin film (2), so the above-mentioned clear coating layer,
When installing the antifogging resin layer and the photocurable resin layer (4a), use a resin liquid that can form a layer at a temperature of 100°C or below, preferably 80°C or room temperature, or use a photocurable resin solution. It is desirable to use a resin liquid of

Function and Effects of the Invention The functional glass of the present invention is a conductive glass in which a conductive reticular thin film (2) having a specific thickness, line width, size, and porosity is provided on the surface of a transparent glass (1). It consists of (3).

Since the thickness, line width, size, and aperture ratio are set as above, the overall appearance is slightly grayish when visually inspected, and the mesh is virtually indistinguishable, and the transparency is good. .

When using this as anti-fog glass, if you attach a terminal and turn on electricity from an appropriate power source, the entire surface will heat up in a very short time (about a few seconds) because the size of the mesh is small, and the entire surface will heat up. The haze disappears, as opposed to traditional nichrome wire-enclosed glass, which takes several minutes for the entire scale to disappear.

Also, because it has a mesh structure, it has good electromagnetic shielding properties (electromagnetic shielding does not require energization).
This glass has both transparency and electromagnetic wave shielding properties, and is useful as, for example, filters for displays of office automation equipment, glass for instruments, glass for viewing windows, and the like.

If an antifogging resin layer is used as the protective layer (4), the antifogging property is obtained by the antifogging resin layer, so that both electromagnetic shielding properties and antifogging properties can be obtained even without applying electricity.

Example Next, the present invention will be explained in detail with reference to Examples.

Hereinafter, "r parts" refers to parts by weight.

Example 1 FIG. 1 is a perspective view showing an example of the functional glass of the present invention.

Stainless steel was sputtered on the surface of the glass (1) to form a conductive thin film (2a) with a thickness of 200 OA.

Next, a resist film was formed on the conductive thin film (2a), exposed to light, developed, etched, and the resist film was peeled off to form holes in the conductive thin film (2a) in the form of a regular hexagonal network as shown in FIG. .

This creates a conductive reticular thin film (2) on the surface of the glass (1).
was formed. The line width a of one side of the mesh was 80 μm, the size b of one mesh unit was 770 μm, and the open area ratio was 80%.

The electrically conductive glass (3) thus obtained had good transparency, with the entire surface appearing slightly grayish and virtually no mesh visible (it could be discerned by observation with a magnifying glass).

In addition, the conductive reticular thin film (2) of this conductive glass (3)
When a terminal was attached to the end of the glass and the entire surface of the glass was weighed with water vapor before electricity was applied, the scale was completely removed in just a few seconds.

Since this conductive glass (3) has excellent electromagnetic shielding properties (it is preferable to ground it), it is also suitable as an electromagnetic shielding material having transparency.

Example 2 FIG. 2 is a plan view showing another example of the functional glass of the present invention.

Conductive reticular thin film of conductive glass (3) obtained in Example 1 (
2) A clear coating of room temperature curing acrylic urethane resin liquid was applied to the installation surface, followed by dry curing to form a transparent protective layer (4) with a thickness of 50 μm.

The conductive glass with the protective layer (4) obtained in this way (
Sample 3) had excellent antifogging properties and electromagnetic shielding properties similar to those of Example 1, and also had scratch resistance.

Example 3 FIG. 3 is a plan view showing still another example of the functional glass of the present invention.

Conductive reticular thin film of conductive glass (3) obtained in Example 1 (
2) The installation surface was coated with an acrylic ultraviolet curable resin liquid, and then a glass plate was laminated on top. By irradiating this with ultraviolet rays from both sides using a high-pressure mercury lamp, the coating layer of the photocurable resin liquid was cured.

As a result, the conductive reticular thin film (2) of the conductive glass (3)
) A transparent photocurable resin layer (4a) with a thickness of 90 μm is placed on the installation surface.
) A transparent functional glass was obtained in which a protective glass (4b) was provided through the glass.

Example 4 FIG. 4 is a plan view showing another example of the functional glass of the present invention.

Nickel was sputtered on the surface of the glass film according to a conventional method to form a conductive thin film (2a) with a thickness of 220 OA.

Next, a resist film was formed on the conductive thin film (2a), developed, etched, and the resist film was peeled off to form holes in the conductive thin film (2a) in the shape of a square net as shown in FIG.

This creates a conductive reticular thin film (2) on the surface of the glass (1).
was formed. The line width a of one side of the mesh was 70 μm, the size b of one mesh unit was 700 μm, and the open area ratio was 81%.

The electrically conductive glass (3) thus obtained had good transparency, with only a slight grayish appearance as a whole and virtually no discernible mesh.

In addition, the conductive reticular thin film (2) of this conductive glass (3)
When we installed a terminal at the end of the glass and fogged the entire surface of the glass with water vapor before applying electricity, the fog was completely removed in just a few seconds.

Since this conductive glass (3) has excellent electromagnetic shielding properties, it is also suitable as a see-through electromagnetic shielding material.

Example 5 Conductive reticular thin film of conductive glass (3) obtained in Example 4 (
2) Apply 2-hydroxyethyl methacrylate 3 to the installation surface.
0 parts, 70 parts of urethane acrylate oligomer, 1 part of photopolymerization initiator, and 1 part of natural plant fragrance is coated with an ultraviolet curable resin liquid and then irradiated with ultraviolet rays to have antifogging properties with a thickness of 80 μm. Transparent protective layer (4
) was formed.

The functional glass thus obtained has excellent electromagnetic shielding properties and also has good antifogging properties even without electricity.

Example 6 Conductive reticular thin film of conductive glass (3) obtained in Example 4 (
2) The installation surface was coated with an acrylic ultraviolet curable resin liquid, and then a glass plate was laminated on top. By irradiating this with ultraviolet rays from both sides using a metal halide lamp, the coating layer of the photocurable resin liquid was cured.

As a result, the conductive reticular thin film (2) of the conductive glass (3)
) On the installation surface, a transparent photocurable resin layer (4
A transparent functional glass provided with a protective glass (4b) through a) was obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the functional glass of the present invention. FIG. 2 is a plan view showing another example of the functional glass of the present invention. FIG. 3 is a plan view showing still another example of the functional glass of the present invention. FIG. 4 is a plan view showing another example of the functional glass of the present invention. (1)...Glass, (2)...Conductive reticular thin film, (2a)...Conductive thin film, (3)...Conductive glass, (4)...Protective layer, (4a)... )...Photocurable resin layer, (4b)...Protective glass Fig. 2 Fig. b 4a

Claims (6)

[Claims] 1. The surface of the transparent glass (1) has a thickness of 100 Å to 50 Å.
Functionality consisting of a conductive glass (3) provided with a conductive reticular thin film (2) with a mesh width of 40 to 400 μm, a mesh unit size of 250 to 5000 μm, and a porosity of 70 to 90%. glass. 2. 2. The functional glass according to claim 1, wherein the conductive reticular thin film (2) is formed by further opening the conductive thin film (2a) formed on the surface of the glass (1) into a reticular shape. 3. The functional glass according to claim 2, wherein the conductive thin film (2a) is formed by a vacuum thin film forming method. 4. The functional glass according to claim 1, wherein the conductive reticular thin film (2) is formed by printing on the surface of the glass (1). 5. A conductive reticular thin film of the conductive glass (3) according to claim 1 (
2) Functional glass with a single-layer or multi-layer protective layer (4) provided on the installation surface. 6. A conductive reticular thin film of the conductive glass (3) according to claim 1 (
2) On the installation surface, as a protective layer (4), apply a photocurable resin layer (
Functional glass provided with a protective glass (4b) via 4a).