KR102177964B1 - Low reflection coating glass - Google Patents

Abstract

The present invention relates to a low-reflective coated glass, specifically, the low-reflective coated glass according to the present invention comprises a glass substrate; And a low-reflective coating layer including a first high-refractive-index layer, a first low-refractive-index layer, a second high-refractive-index layer, and a second low-refractive-index layer sequentially stacked; including, the first high-refractive-index layer and the first 2 Each of the high refractive index layers has a refractive index of 2.0 to 2.5 and contains titanium oxide, and each of the first low refractive index layer and the second low refractive index layer has a refractive index of 1.3 to 1.6, contains silicon oxide, and includes the low reflection The coating layer has a total thickness of 300 nm to 600 nm.

Description

Low reflection coating glass {LOW REFLECTION COATING GLASS}

The present invention relates to a low-reflective coated glass.

Low-reflective coated glass is a functional glass with reduced glare and improved visibility due to low visible light reflectance, and is widely used in the fields of lenses, window glass, decorative glass, and displays. Such low-reflective coated glass is typically manufactured by alternately laminating 3 to 6 layers of dielectric layers having high refractive index and dielectric layers having low refractive index.

Specifically, Korean Patent Application Publication No. 1,015,155 (Patent Document 1) discloses a multilayer transparent substrate manufactured by alternately stacking high refractive index layers and low refractive index layers in a specific thickness range, respectively. However, the multilayer transparent substrate of Patent Document 1 has a disadvantage in that the side reflection color emits red light.

Therefore, it is necessary to research and develop a low-reflective coating layer having a neutral color when observing the side with a low visible light reflectance and a high infrared blocking rate.

Korean Registered Patent Publication No. 1,015,155 (Publication date: 2005. 03. 10.)

Accordingly, an object of the present invention is to provide a low-reflective coated glass including a low-reflective coating layer having a neutral color when viewed from the side, a low reflectance of visible light, and a high infrared blocking rate.

The present invention is a glass substrate; And a low-reflective coating layer including a first high-refractive-index layer, a first low-refractive-index layer, a second high-refractive-index layer, and a second low-refractive-index layer sequentially stacked; including, the first high-refractive-index layer and the first 2 Each of the high refractive index layers has a refractive index of 2.0 to 2.5 and contains titanium oxide, and each of the first low refractive index layer and the second low refractive index layer has a refractive index of 1.3 to 1.6, contains silicon oxide, and includes the low reflection The coating layer provides a low-reflective coated glass having a total thickness of 300 nm to 600 nm.

The low-reflection coated glass according to the present invention has an advantage of improving visibility of the display by having a low reflectance of visible light and a high infrared blocking rate, so that a display exposed to an external high temperature can be effectively protected, and has a neutral color when viewed from the side.

Hereinafter, the present invention will be described in detail.

Low reflection coated glass

The low-reflection coated glass according to the present invention comprises a glass substrate; And a low reflection coating layer.

In the present specification, "refractive index" is a value of the refractive index measured for a wavelength of 550 nm using a spectroscopic ellipsometer.

Glass substrate

The glass substrate may be, for example, a conventional glass such as soda-lime glass, soda-lime-silicate glass, and fused silica glass; Low-iron patterned glass, low-iron float glass, transparent conductive oxide (TCO) glass, and the like. In addition, as the glass substrate, surface texture treatment or reinforced or partially strengthened glass may be used as necessary.

Low reflection coating layer

The low-reflection coating layer includes a form in which a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer are sequentially stacked. Specifically, the low-reflection coating layer may have a four-layer structure in which a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer are sequentially stacked.

<First high refractive index layer>

The first high refractive index layer has a refractive index of 2.0 to 2.5 and includes titanium oxide. Specifically, the first high refractive index layer has a refractive index of 2.1 to 2.5, 2.1 to 2.4, or 2.2 to 2.4, and may include titanium oxide. When the refractive index of the first high refractive index layer is out of the above range, the visible light reflectance of the low-reflective coating glass may not be sufficient.

The first high refractive index layer may have a thickness of 5 nm to 15 nm. Specifically, the first high refractive index layer may have a thickness of 7 nm to 15 nm, 7 nm to 13 nm, or 8 nm to 12 nm.

In addition, the first high refractive index layer may have a thickness of 100 nm to 130 nm. Specifically, the first high refractive index layer may have a thickness of 110 nm to 120 nm, or 112 nm to 118 nm.

<The second high refractive index layer>

The second high refractive index layer has a refractive index of 2.0 to 2.5 and includes titanium oxide. More specifically, the second high refractive index layer has a refractive index of 2.1 to 2.5, 2.1 to 2.4, or 2.2 to 2.4, and may include titanium oxide. When the refractive index of the second high refractive index layer is out of the above range, the visible light reflectance of the low-reflective coating glass may not be sufficient.

The second high refractive index layer may have a thickness of 100 nm to 135 nm. Specifically, the second high refractive index layer may have a thickness of 100 nm to 120 nm, or 100 nm to 110 nm.

<First low refractive index layer>

The first low refractive index layer has a refractive index of 1.3 to 1.6 and includes silicon oxide. Specifically, the first low refractive index layer has a refractive index of 1.3 to 1.5, or 1.4 to 1.5, and may include silicon oxide. When the refractive index of the first low refractive index layer is out of the above range, there is a disadvantage that the side reflection color of the coated surface does not have a neutral color and has a very red color.

The first low refractive index layer may have a thickness of 180 nm to 230 nm. Specifically, the first low refractive index layer may have a thickness of 182 nm to 225 nm.

<The second low refractive index layer>

The second low refractive index layer has a refractive index of 1.3 to 1.6 and includes silicon oxide. Specifically, the second low refractive index layer has a refractive index of 1.3 to 1.5, or 1.4 to 1.5, and may include silicon oxide. When the refractive index of the second low refractive index layer is out of the above range, the visible light reflectance of the low-reflective coating glass is not sufficient, and when the glass is viewed from the side, a red color instead of a neutral color may occur.

The second low refractive index layer may have a thickness of 65 nm to 95 nm. Specifically, the second low refractive index layer may have a thickness of 70 nm to 90 nm, or 75 nm to 85 nm.

The low-reflective coating layer has a total thickness of 300 nm to 600 nm. Specifically, the low reflection coating layer may have a total thickness of 350 nm to 570 nm, 400 nm to 500 nm, or 410 nm to 490 nm.

The low reflection coating layer may include a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer at a thickness ratio of 1: 15 to 36: 8 to 21: 5 to 17. Specifically, the low-reflection coating layer includes a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer in a thickness ratio of 1: 21 to 23: 10 to 11: 7.5 to 9. I can.

The low-reflective coating layer may include a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer in a thickness ratio of 1: 1.3 to 2.3: 0.7 to 1.4: 0.5 to 0.9. Specifically, the low-reflection coating layer may include a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer in a thickness ratio of 1: 1.4 to 2.0: 0.8 to 1.1: 0.6 to 0.8. I can.

When the thickness ratio of each layer is out of the above range, the visible light reflectance and transmittance, and infrared reflectance and blocking rate of the low-reflective coated glass are insufficient, and a problem may occur in that the glass is viewed as red instead of neutral color when viewed from the side.

The low-reflection coated glass has a visible light reflectance of 5% or less, a visible light transmittance of 90% or more, an infrared ray blocking rate of 45% or more, and │a*│≤10 and │b*│≤ Can have 10 neutral colors. Specifically, the low-reflection coated glass has a visible light reflectance of 4.9% or less, a visible light transmittance of 90.1% or more, an infrared ray blocking rate of 47% or more, and │a*│≤8 or 3 when viewed from the side at 50°, And │b*│≦7, or 6 may have a neutral color.

The low-reflective coated glass as described above is very suitable for protecting a display such as a large format display (LFD) compared to the conventional low-reflective coated glass in which the side color is red because the side color exhibits an intermediate color. In addition, the low-reflection coated glass has a low visible light transmittance and a high infrared ray blocking rate, so that a display exposed to a high external temperature can be effectively protected.

Hereinafter, the present invention will be described in more detail through examples.

However, these examples are only intended to aid understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

[Example]

Example 1.

A first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer were sequentially formed on a 6 mm glass substrate to prepare a low reflection coated glass, and the thickness of each refractive index layer is shown in Table 1 below. Shown in.

Specifically, the deposition of each refractive index layer was performed using a magnetron sputtering facility, and a TiO ₂ target and a SiAl target were used. For this reason, the first high refractive index layer and the second high refractive index layer are composed of titanium oxide having a refractive index of 2.32, and the first low refractive index layer and the second low refractive index layer are composed of silicon oxide having a refractive index of 1.45.

Examples 2 to 8 and Comparative Examples 1 to 10.

A low-reflective coated glass was prepared in the same manner as in Example 1, except that the thickness of each refractive index layer was adjusted as described in Tables 1 and 2 below.

Test Example: Measurement of properties of low-reflective coated glass

The physical properties of the low-reflective coated glass of Examples 1 to 8 and Comparative Examples 1 to 10 were measured in the following manner, and the results are shown in Tables 1 to 3.

(1) Infrared and visible light transmittance and reflectance

Transmittance and reflectance were measured using a spectrophotometer Lambda950 (PerkinElmer, KS L 2514 standard) in the region of 300 nm to 1500 nm according to the KS L 2514 standard, and the results are shown in Tables 1 and 2. At this time, the infrared ray blocking rate is defined as (100-infrared ray transmittance)%. In addition, the visible light transmittance and reflectance in Tables 1 and 2 are values of 380 nm to 780 nm, and the infrared blocking rate and reflectance are values of 780 nm to 2,500 nm.

(2) Reflected color and color change value by angle

The reflective color of the low-reflective coated glass and the color change value for each angle were measured according to the C.I.E system. Specifically, the color difference was measured using a spectrophotometer Lambda950 (PerkinElmer), and it was confirmed using an accessory for taking colors for each angle, and the results are shown in Tables 1 to 3.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Second low refractive index layer 80 nm 80 nm 80 nm 80 nm 80 nm 80 nm 80 nm 80 nm 2nd high refractive index layer 102 nm 102 nm 120 nm 120 nm 105 nm 105 nm 105 nm 135 nm First low refractive index layer 180 nm 220 nm 230 nm 230 nm 183 nm 190 nm 183 nm 220 nm First high refractive index layer 5 nm 10 nm 12 nm 15 nm 100 nm 110 nm 115 nm 130 nm Visible light transmittance 91.20% 91.30% 90.84% 90.44% 90.02% 90.03% 90.20% 90.51% Visible light reflectance 4.97% 4.40% 4.91% 4.95% 4.96% 4.89% 4.90% 4.83% Infrared reflectance 23.40% 24.70% 25.10% 27.70% 32.00% 36.20% 36.00% 36.90% Infrared cutoff rate 46.10% 47.60% 48.90% 49.10% 52.90% 53.10% 55.30% 57.10% △a*b* 9.9 20.3 15.5 15.5 15.8 12.9 10.6 14.4 Reflective color of coated surface 50°a* 4.8 2.5 -3.1 -2.6 -3.2 -0.3 1.2 -2.7 50°b* -1.9 -0.5 -4.4 -5.1 -5.5 2.8 -6.2 4.8

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Second low refractive index layer 95 65 65 120 180 80 80 80 40 80 2nd high refractive index layer 135 100 100 80 110 102 102 40 102 100 First low refractive index layer 230 180 180 20 200 220 5 220 220 35 First high refractive index layer 4 16 140 40 10 50 10 10 10 10 Visible light transmittance 89.18% 88.80% 87.13% 87.40% 84.70% 78.10% 89.60% 85.50% 86.40% 90.10% Visible light reflectance 7.38% 7.61% 8.96% 8.80% 11% 17% 5.20% 9.80% 8.20% 5.20% Infrared reflectance 33.00% 23.70% 22.70% 21.20% 38.40% 30.40% 19.10% 21.90% 30.50% 21.20% Infrared cutoff rate 52.70% 42.10% 45.90% 42.70% 57.10% 50.00% 31.90% 42.60% 48.10% 41.50% △a*b* 11.6 16.6 7.9 21.1 14.3 9.3 19.9 20.5 18.9 31.3 Reflective color of coated surface 50°a* 17.07 -5.8 3.56 17.6 22.3 16.3 20.4 11.5 23.1 19.8 50°b* -5.7 -13.9 -20.79 -35.4 -7.2 -6.2 -10.7 -15.9 -1.8 -8.4

As shown in Table 1, the low-reflective coated glass of Examples 1 to 8 had high visible light transmittance and infrared blocking rate, low visible light reflectance, and had a neutral side color.

On the other hand, as shown in Table 2, it was found that the glass of Comparative Examples 1 to 10 had a high visible light reflectance of 5% or more, and a low visible light transmittance, so that it was not suitable for protection of displays exposed to high external temperatures. .

Reflective color of coated surface △a*b* face 30° 50° Example 1 a* 9.6 5.6 4.8 9.9 b* -7.9 -2.7 -1.9 Example 2 a* 8.1 6.5 2.5 20.3 b* -19.9 -11.7 -0.5 Example 3 a* 2.8 -6.8 -3.1 15.5 b* -9.9 -3.3 -4.4 Example 4 a* 8.1 0.1 -2.6 15.5 b* -19.9 -11.2 -5.1 Example 5 a* 6.3 -1.5 -3.2 15.8 b* -11.2 -2.1 -5.5 Example 6 a* 4.3 3 -0.3 12.9 b* -8.8 -1.3 2.8 Example 7 a* 6.6 2.5 1.2 10.6 b* -12.1 -12.6 -6.2 Example 8 a* 5.2 -1.2 -2.7 14.4 b* -7.1 3.6 4.8 Comparative Example 1 a* 9 10.9 11.2 11.6 b* -8.2 -1.3 -5.7 Comparative Example 2 a* 10.3 -3.8 -5.8 16.6 b* -16.4 -13.2 -13.9 Comparative Example 3 a* 8.8 2.7 3.56 7.9 b* -12.6 -12.1 -13.7 Comparative Example 4 a* 12 19.7 17.6 21.1 b* -48.7 -48.6 -35.4 Comparative Example 5 a* 8.2 15.8 22.3 14.3 b* -8.4 -8.5 -7.2 Comparative Example 6 a* 7.9 11.9 16.3 9.3 b* -10.2 -8.1 -6.2 Comparative Example 7 a* 16.8 19.4 20.4 19.9 b* 8.9 -4.4 -10.7 Comparative Example 8 a* 29.8 18.9 11.5 20.5 b* -15.9 -11.3 -15.9 Comparative Example 9 a* 20.1 22.8 23.1 18.9 b* -20.3 -10.6 -1.8 Comparative Example 10 a* 6.6 17.8 19.8 31.3 b* 19.8 -1.3 -8.4

As shown in Table 3, the glasses of Examples 1 to 8 exhibited neutral colors in both the front and side surfaces. On the other hand, the glasses of Comparative Examples 1 to 10 had a purple color in both the front and side surfaces.

Claims (6)

Glass substrates; And
Including; a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a low-reflective coating layer including a form in which the second low refractive index layer is sequentially stacked,
Each of the first high refractive index layer and the second high refractive index layer has a refractive index of 2.32 to 2.5 and includes titanium oxide,
Each of the first low refractive index layer and the second low refractive index layer has a refractive index of 1.3 to 1.6 and contains silicon oxide,
The low reflection coating layer has a total thickness of 300 nm to 600 nm,
The first low refractive index layer has a thickness of 180nm to 230nm, low-reflection coated glass. The method according to claim 1,
The first high refractive index layer has a thickness of 5 nm to 15 nm,
The first low refractive index layer has a thickness of 180 nm to 230 nm,
The second high refractive index layer has a thickness of 100 nm to 135 nm,
The second low refractive index layer has a thickness of 65nm to 95nm, low-reflection coated glass. The method according to claim 2,
The low reflection coating layer includes a first high refractive index layer, a first low refractive index layer, a second high refractive index layer and a second low refractive index layer in a thickness ratio of 1: 15 to 36: 8 to 21: 5 to 17, low reflection Coated glass. The method according to claim 1,
The first high refractive index layer has a thickness of 100 nm to 130 nm,
The first low refractive index layer has a thickness of 180 nm to 230 nm,
The second high refractive index layer has a thickness of 100 nm to 135 nm,
The second low refractive index layer has a thickness of 65nm to 95nm, low-reflection coated glass. The method of claim 4,
The low-reflective coating layer includes a first high refractive index layer, a first low refractive index layer, a second high refractive index layer, and a second low refractive index layer in a thickness ratio of 1: 1.3 to 2.3: 0.7 to 1.4: 0.5 to 0.9. Coated glass. The method according to claim 1,
Visible light reflectance is 5% or less, visible light transmittance is 90% or more, infrared ray blocking rate is 45% or more, and has a neutral color of │a*│≤10 and │b*│≤10 when viewed from the side at 50° , Low-reflective coated glass.