JP3116070B2 - Glass for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a window glass for a vehicle. More specifically, the present invention relates to a bronze vehicle window glass having an excellent ability to absorb ultraviolet rays and heat rays.

[0002]

2. Description of the Related Art The following colored glass has been conventionally used for vehicles. A so-called blue glass in which CoO is added to Fe ₂ O ₃ , a so-called green glass in which the content of Fe ₂ O ₃ is higher than that of the blue glass to improve the heat ray absorbing ability, so-called green glass, Fe ₂ O ₃ , CoO, NiO , Se
, A so-called bronze glass or the like.

[0003] Blue glass and green glass, which have a relatively large content of Fe ₂ O ₃ , have relatively large absorption of heat rays and ultraviolet rays. As the demand for preventing deterioration has become stronger, a glass for vehicles having higher heat ray absorption, which is excellent in ultraviolet absorption and can satisfy requirements for energy saving at the same time, has been developed. This glass is Fe ₂
Since O ₃ is contained in a larger amount than before, it is also green.

[0004]

However, the conventional bronze-colored glass has a Fe ₂ O ₃
, The absorption of ultraviolet rays and heat rays was not sufficient, and it was not sufficient to satisfy the demand to prevent the interior materials of the vehicle from being deteriorated by the ultraviolet rays. From the viewpoint of vehicle design, a gray or bronze vehicle glass excellent in ultraviolet and heat ray absorbing ability is desired. Previously, the inventors proposed a gray heat ray absorbing glass having a large heat ray absorbing ability containing tin oxide as a reducing agent, but there was a disadvantage that tin oxide was expensive. In addition, the inventors have discovered that ultraviolet rays containing cerium oxide and iron oxide as ultraviolet absorbers.
Although heat ray absorbing glass was proposed, there was a disadvantage that cerium oxide was expensive.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional vehicle glass as described above, and to provide a gray glass having a large ultraviolet and heat ray absorbing ability suitable for a vehicle.

[0006]

The vehicular glass of claim 1 is essentially 65 to 80% SiO 2, expressed in weight percent.
_2, 0-5% Al ₂ O _3, 0-5% B ₂ O _3, 0
% MgO, 5-15% CaO, 10-18% Na
₂ O, 0-5% K ₂ O, 5-15% MgO + CaO,
10-20% _{Na 2 O + K 2 O,} 0.1~1% of CeO
Cerium oxide converted to ₂ , 0.2-0.6% Fe ₂ O
Iron oxide converted to ₃ , 0-0.005% CoO, 0
0.01% NiO, 0.0005-0.005% S
e.

According to a second aspect of the present invention, the window glass converted to a thickness of 4 mm has a visible light transmittance of 7 mm by the A light source.
0% or more, and the main wavelength by the C light source is 570 nm
The glass for a vehicle according to claim 1, wherein:

According to a third aspect of the present invention, the window glass has a solar radiation transmittance of not more than 60% and a transmittance at a wavelength of 350 nm of not more than 10% when converted to a thickness of 4 mm. A glass for a vehicle according to claim 2.

The glass for vehicles according to claim 4 is essentially 65 to 80% of SiO ₂ and 0 to 5% of A expressed by weight%.
l ₂ O _3, 0~5% of B ₂ O _3, 0~10% of MgO,. 5 to
15% of CaO, 10 to 18 percent of Na ₂ O, 0 to 5% of the K ₂ O, 5 to 15 percent of MgO + CaO, 10 to 20 percent of _{Na 2 O + K 2 O,} 0.1~1% of CeO ₂ Cerium oxide, 0 to 1% TiO ₂ , 0.2 to 0.6% iron oxide, converted to Fe ₂ O ₃ , 0 to 0.005% Co
O, 0-0.01% NiO, 0.0005-0.00
It is characterized by being composed of 5% Se.

According to a fifth aspect of the present invention, the window glass converted to a thickness of 4 mm has a visible light transmittance of 7% by the A light source.
0% or more, and the main wavelength by the C light source is 570 nm
The glass for a vehicle according to claim 4, wherein:

According to a sixth aspect of the present invention, the window glass has a solar radiation transmittance of not more than 60% and a transmittance at a wavelength of 350 nm of not more than 10% when converted to a thickness of 4 mm. A vehicle glass according to claim 5.

[0012]

[Function] SiO ₂ forms the skeleton of glass, and 65%
If the amount is less than 80%, the durability of the glass decreases. If the amount exceeds 80%, melting of the glass becomes difficult.

Al ₂ O ₃ is a component for improving the durability of glass, but if it exceeds 5%, it becomes difficult to melt the glass. Preferably, it is in the range of 0.1 to 2%.

B ₂ O ₃ is used for improving the durability of the glass and as a melting aid, but may not be contained in the glass. If B ₂ O ₃ exceeds 5%, inconvenience during molding due to volatilization of B ₂ O ₃ will occur, so the upper limit is 5%.

MgO and CaO are used to improve the durability of the glass and to adjust the devitrification temperature and viscosity during molding. When the content of MgO exceeds 10%, the devitrification temperature increases. If CaO is less than 5% or more than 15%, the devitrification temperature becomes high. If the total of MgO and CaO is less than 5%, the durability of the glass deteriorates. If the total of MgO and CaO exceeds 15%, the devitrification temperature increases.

Na ₂ O and K ₂ O are used as glass melting accelerators. Na ₂ O is less than 10%, or poor effect of melt promotion in total less than 10% of Na ₂ O and K ₂ O, or Na ₂ O exceeds 18%, or Na ₂ O and K ₂
If the total amount of O exceeds 20%, the durability decreases. K ₂ O
Is more expensive than Na ₂ O, so the upper limit is 5%.

Cerium oxide contains CeO ₂ and Ce _{2 in} glass.
It can be O ₃ , but all have ultraviolet absorbing ability.
If cerium oxide is less than 0.1% in terms of CeO ₂ , the effect of absorbing ultraviolet light is small, and if it exceeds 1%, visible light is absorbed and the visible light transmittance is undesirably reduced.

TiO ₂ is used as an ultraviolet absorbing component. When iron oxide coexists, it interacts with TiO ₂ ,
The effect of absorbing ultraviolet light increases. By introducing TiO ₂ into glass, the amount of cerium oxide, which is an expensive raw material, can be reduced, which has an economic effect. However, if iron oxide coexists, it also absorbs the short wavelength side of visible light and lowers the visible light transmittance, so the upper limit is 1%.

Iron oxide can become Fe ₂ O ₃ and FeO in glass. Fe ₂ O ₃ absorbs ultraviolet rays, and FeO absorbs heat rays. If the iron oxide content is less than 0.2% in terms of Fe ₂ O ₃ , the effect of absorbing ultraviolet rays and heat rays is small, and if it exceeds 0.6%, the visible light transmittance is undesirably reduced.
As the proportion of FeO in the total iron oxide increases, the heat ray absorption of the glass increases, but the glass becomes reducible and becomes difficult to color with Se. Therefore, Fe in the total iron oxide
The ratio of O is desirably 23 to 35%.

The value of FeO can be obtained from the following equation when the transmittance of light at 1000 nm of a glass plate having a thickness of 4 mm is T ₁₀₀₀ %. [FeO]% = - 0.25635 × Log 10 (T 1000 /100)-0.08 The ratio of FeO to total iron oxide, the total iron oxide F
When the value represented by e ₂ O ₃ is T-Fe ₂ O ₃ , it is represented by the following equation. [Proportion of FeO]% = 111.13 × [FeO] / [T-Fe ₂ O ₃ ] The absorption peak of CoO is around 600 nm and is used to fine-tune the main wavelength of glass. CoO is 0.00
If it exceeds 5%, the visible light transmittance is reduced.
The upper limit is 05%.

The absorption peak of NiO is around 450 nm, and is used to fine-tune the main wavelength of glass, like CoO. If NiO exceeds 0.01%, the visible light transmittance decreases, so the upper limit is 0.01%.

Although CoO and NiO reduce visible light transmittance, they do not absorb ultraviolet rays and heat rays, so that it is desirable not to use them as much as possible.

Se is an essential component for producing a bronze glass by neutralizing the green color of the glass containing iron oxide. If Se is less than 0.0005%, the effect of neutralizing the glass is small, and if it exceeds 0.005%, the visible light transmittance of the glass is undesirably reduced.

In addition to the above components, the glass for a vehicle according to the present invention may contain the following components within a range not to impair the gist of the present invention.

In order to improve durability, BaO, Zn
O and ZrO ₂ may each be contained at 1% or less. As a glass melting aid, Li ₂ O and F may each be contained in an amount of 1% or less. SO ₃ , As ₂ O ₃ , Sb ₂ O as fining agents
₃ , each may contain 1% or less of Cl.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the tables.

Tables 1, 2 and 3 show the glass compositions and the optical characteristics of the examples according to the present invention and the comparative examples of the conventional bronze glass for vehicles.

[0028]

[Table 1]

[0029]

[Table 2]

[0030]

[Table 3]

In Tables 1, 2 and 3, T-Fe ₂ O ₃
The the total iron oxide, R represents the ratio of FeO to total iron oxide (wt%), a T _G solar radiation transmittance, Y _A visible light transmittance (by light source A), lambda _d is dominant wavelength (Depending on C light source)
, Pe is the stimulus purity (by C light source), _TUV is 350
The transmittance in nm is shown.

In the production of glass, quartz sand, borax,
A batch prepared by mixing and mixing feldspar, limestone, dolomite, soda ash, sodium sulfate, carbon, cerium oxide, titanium oxide, red iron oxide, cobalt oxide, nickel oxide, and selenium according to the target composition is heated and melted in an electric furnace. did. After the glass was cast and formed, it was gradually cooled to room temperature. The gradually cooled colored glass is cut and polished to a predetermined size to prepare a 4 mm thick sample for measuring optical characteristics, and using standard light sources A and C,
Optical characteristics were measured by a 2 ° field of view. The magnitude of ultraviolet absorption was compared by the transmittance at 350 nm.
Compared to the glass of the comparative example, it can be seen that the glass of the example has a low solar radiation transmittance and a large ultraviolet absorption even at a visible light transmittance of 70% or more.

[0033]

As described in detail above, the glass for vehicles according to the present invention is a bronze glass having a high visible light transmittance, a low solar radiation transmittance and a large ultraviolet absorption.
Not only is it suitable for vehicles, it is also convenient for construction.

[0034]

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C03C 3/095 B60J 1/00

Claims (6)

(57) [Claims] 1. Essentially 65 to 8 expressed in% by weight.
0% SiO _2, 0 to 5% of the Al ₂ O _{3, 0~5%} of B ₂ O
₃ , 0-10% MgO, 5-15% CaO, 10
18% of Na ₂ O, 0 to 5% of the K ₂ O, 5 to 15% of the Mg
O + CaO, 10-20% Na ₂ O + K ₂ O, 0.1-
Cerium oxide in terms of 1% CeO ₂ , 0.2 to 0.
Iron oxide in terms of 6% Fe ₂ O ₃ , 0-0.005% CoO, 0-0.01% NiO, 0.0005-0.
Glass for vehicles, comprising 005% Se. 2. The A of the window glass converted to a thickness of 4 mm.
The visible light transmittance by the light source is 70% or more;
The vehicle glass according to claim 1, wherein a main wavelength of the light source is 570 nm or more. 3. The window glass has a solar radiation transmittance of not more than 60% and a wavelength of 350 nm when converted to a thickness of 4 mm.
The glass for vehicles according to claim 2, wherein the transmittance of the glass is 10% or less. 4. Essentially 65 to 8 expressed in% by weight.
0% SiO _2, 0 to 5% of the Al ₂ O _{3, 0~5%} of B ₂ O
₃ , 0-10% MgO, 5-15% CaO, 10
18% of Na ₂ O, 0 to 5% of the K ₂ O, 5 to 15% of the Mg
O + CaO, 10-20% Na ₂ O + K ₂ O, 0.1-
Cerium oxide converted to 1% CeO ₂ , 0 to 1% T
iO ₂ , 0.2-0.6% iron oxide in terms of Fe ₂ O ₃ , 0-0.005% CoO, 0-0.01% Ni
A glass for vehicles, comprising O, 0.0005 to 0.005% Se. 5. A of a window glass converted to a thickness of 4 mm,
The visible light transmittance by the light source is 70% or more;
The vehicle glass according to claim 4, wherein a main wavelength of the light source is 570 nm or more. 6. The window glass has a solar radiation transmittance of not more than 60% and a wavelength of 350 nm in terms of a thickness of 4 mm.
6. The glass for vehicles according to claim 5, wherein the transmittance of the glass is 10% or less.