JP5100741B2 - UV blocking glass - Google Patents

Description

  The present invention relates to an ultraviolet blocking glass.

  Conventionally, ultraviolet blocking glass has been used as a filter or the like for blocking (absorbing) harmful components contained in ultraviolet rays or preventing fading of articles and the like due to ultraviolet irradiation.

As the glass, for example, Patent Document 1 discloses that SiO ₂ 65 to 80%, B ₂ O ₃ 5 to 20%, Al ₂ O ₃ 2 to 8%, RO 1 to 5% (RO is MgO) by weight percentage. , CaO, BaO, SrO, ZnO selected from the group of 1 or 2 or more), R ₂ O 4-8% (however, R ₂ O is selected from the group of Na ₂ O, K ₂ O, Li ₂ O) 2 or more), CeO ₂ 0.3 to 4%, Fe ₂ O ₃ 0.01 to 0.2%, V ₂ O ₅ 0.0005 to less than 0.005%, TiO ₂ 0 to 2% An ultraviolet-absorbing glass having the above is described (claim 1 of Patent Document 1). And this ultraviolet absorptive glass is said to be able to efficiently absorb ultraviolet rays having a wavelength of 320 nm or less that are harmful to human bodies, among ultraviolet rays ([Effect of invention] of Patent Document 1).

  However, the conventional ultraviolet blocking glass has the following problems.

  First, the wavelength inclination width is relatively large, and it is difficult to obtain a sharp blocking effect. In Patent Document 1, the transition (inclination width) of the ultraviolet transmittance in Examples is gentle, and a sharp ultraviolet blocking effect is desired. Secondly, further improvement in solarization resistance is desired. UV blocking glass is known to have a gradual change in UV transmittance (so-called solarization) when irradiated with UV light for a long time, which means that the spectral characteristics of the glass change over time. Improvement of solarization is desired.

  In addition, an ultraviolet blocking glass that can sufficiently block near ultraviolet rays is desired. That is, it is desired to develop an ultraviolet blocking glass having a high visible light transmittance and a sharp blocking effect in the range of 315 to 355 nm.

JP-A-6-56467

  The main object of the present invention is to provide an ultraviolet blocking glass that blocks ultraviolet rays sharply, has high visible light transmittance, and has improved solarization resistance.

  As a result of intensive studies to achieve the above object, the present inventor has found that the above object can be achieved with a phosphate glass having a specific composition, and has completed the present invention.

That is, the present invention relates to the following ultraviolet blocking glass.
1. The total amount of glass is 100% by weight, and the oxide composition is
(1) P ₂ O ₅ : 65 to 85% by weight,
_{(2) Al 2 O 3:} 5~17 wt%,
(3) MgO: 0-10 wt%, CaO: 0-10 wt%, SrO: 0-10 wt%, BaO: 0-12 wt% and ZnO: 0-10 wt%, MgO, CaO, 2 to 18% by weight as the total amount of SrO, BaO and ZnO,
₍₄₎ TiO 2: 0.05~2.5 wt%,
_{(5) B 2 O 3:} 0~10 wt%, and ₍₆₎ SiO 2: 0~5 wt%
A sunscreen glass consisting phosphate type glass containing,
When light having a wavelength of 250 to 800 nm is incident on the ultraviolet blocking glass having a thickness of 2.5 mm and the transmittance is measured, the center wavelength between the wavelength of 5% transmittance and the wavelength of 72% transmittance is 315 to 315. An ultraviolet blocking glass having a wavelength of 355 nm and an interval between a wavelength of 5% transmittance and a wavelength of 72% transmittance within 30 nm .

  Hereinafter, the ultraviolet blocking glass of the present invention will be described in detail.

The ultraviolet blocking glass of the present invention has a total glass amount of 100% by weight, and an oxide composition,
(1) P ₂ O ₅ : 65 to 85% by weight,
_{(2) Al 2 O 3:} 5~17 wt%,
(3) MgO: 0-10 wt%, CaO: 0-10 wt%, SrO: 0-10 wt%, BaO: 0-12 wt% and ZnO: 0-10 wt%, MgO, CaO, 2 to 18% by weight as the total amount of SrO, BaO and ZnO,
₍₄₎ TiO 2: 0.05~2.5 wt%,
(5) It consists of phosphate glass containing B ₂ O ₃ : 0 to 10% by weight and (6) SiO ₂ : 0 to 5% by weight.

The ultraviolet blocking glass of the present invention having the above characteristics has a high visible light transmittance, and a sharp blocking effect is obtained in the range of 315 to 355 nm. Specifically, in a preferred embodiment, light having a wavelength of 250 to 800 nm is incident (from a direction perpendicular to the plate surface of the glass plate) on a glass plate having a thickness of 2.5 mm (the ultraviolet blocking glass of the present invention). range when the transmittance was measured, the center wavelength of the transmittance of 5% of the wavelength (lambda ₁₎ and the transmittance 72% of a wavelength _{(λ 2) ((λ 1} + λ 2) / 2) is 315~355nm Te to have the distance between the transmission ratio of 5% of the wavelength (lambda ₁₎ and the transmittance 72% of a wavelength _{(λ 2) (λ 2 -λ} 1) is within 30 nm. That is, the ultraviolet blocking glass of the present invention has a high visible light transmittance and a sharp blocking function with a narrow wavelength slope near the boundary between visible light and ultraviolet light as compared with conventional products.

  Hereinafter, the content of the constituent components in the ultraviolet blocking glass of the present invention will be described.

P ₂ O ₅ is a main component that forms a glass network structure. Content should just be 65 to 85 weight%, and 70 to 78 weight% is especially preferable. When the content is less than 65% by weight, it is difficult to obtain a sufficient ultraviolet blocking property. If the content exceeds 85% by weight, the chemical durability of the glass tends to deteriorate.

Al ₂ O ₃ is a component that suppresses devitrification of glass and enhances chemical durability. Content should just be 5 to 17 weight%, and 8 to 15 weight% is especially preferable. When the content is less than 5% by weight, it is difficult to obtain a sufficient effect. When the content exceeds 17%, the meltability is deteriorated and the glass tends to be devitrified.

  MgO, CaO, SrO, BaO and ZnO are components that lower the viscosity of the glass and facilitate the manufacturing operation. These components can be used alone or in combination of two or more. These contents can be appropriately set from 0 to 10% by weight for MgO, CaO, SrO and ZnO, respectively, and can be appropriately set from 0 to 12% by weight for BaO. In addition, these total amounts should just be 2-18 weight%, and 5-12 weight% is preferable. If these contents exceed 18% by weight, the sharp blocking function may be lowered. If these contents are less than 2% by weight, the effect of addition may be insufficient.

TiO ₂ is an essential component for obtaining ultraviolet sharp cut characteristics. The content may be 0.05 to 2.5% by weight, and more preferably about 0.3 to 1.5% by weight. If the amount is less than 0.05% by weight, the effect cannot be obtained. If the amount exceeds 2.5% by weight, the transmittance up to 400 nm is lowered, the sharp blocking effect is reduced, and the clarification of the glass is also adversely affected.

B ₂ O ₃ is a component that improves the meltability of the glass. Moreover, it becomes a component which comprises a glass network with a specific composition. The content of B ₂ O ₃ is preferably about 0 to 10% by weight, and more preferably about 1 to 5% by weight. If the content of B ₂ O ₃ exceeds 10% by weight, the chemical durability of the glass may be insufficient.

The content of SiO ₂ is preferably about 0 to 5% by weight, and more preferably about 0 to 3% by weight. If the content of SiO ₂ exceeds 5% by weight, the meltability of the glass may be deteriorated.

In addition, the ultraviolet blocking glass of the present invention may contain Li ₂ O, Na ₂ O and K ₂ O as optional components. These components can be appropriately contained within a range of less than 5% by weight for the purpose of improving the melt moldability of the glass, improving the chemical durability, adjusting the transmittance, and the like.

  Although the use of the ultraviolet blocking glass of the present invention is not limited, examples thereof include the following.

(1) Glass material for protecting liquid crystal display panel The backlight of the liquid crystal display panel is irradiated with ultraviolet rays as well as visible light. However, considering the protection of the eyes of those who see the irradiated light and the deterioration of the liquid crystals, the ultraviolet rays are removed. It is preferable to do this.

  The ultraviolet blocking glass of the present invention is useful as a glass material for protecting a liquid crystal display panel. That is, by installing the protective plate made of the glass on the front surface or the back surface of the liquid crystal display plate, it is possible to selectively and sharply block ultraviolet rays irradiated from the backlight. Specifically, when it is installed on the back side of the liquid crystal display panel, ultraviolet rays are removed from the light of the backlight and the liquid crystal is irradiated, so that the deterioration of the liquid crystal can be prevented and the eyes of the viewer can be protected. On the other hand, when it is installed on the front surface of the liquid crystal display panel, it contributes to protecting the eyes of the viewer.

(2) Glass materials for windows Float glass is conventionally used for exterior glass of art craft shops, luxury clothing stores, window glass of various laboratories, window glass of automobiles, and the like. However, it is difficult for the float glass to block ultraviolet rays contained in sunlight. Therefore, there are problems such as discoloration and deterioration of arts and crafts, discoloration and deterioration of clothing, adverse effects on various researches, alteration and deterioration of automobile interior goods. In addition, automobile passengers have problems such as eye damage caused by ultraviolet rays and skin damage such as sunburn.

  The ultraviolet blocking glass of the present invention is useful as a window glass material. That is, by forming exterior glass and window glass from the glass, ultraviolet rays contained in sunlight can be selectively and sharply blocked, and visible light can be selectively transmitted. Thereby, the said problem can be eliminated or reduced.

(3) Optical filter material, illumination filter material, and lens material In optical devices such as cameras, optical filters, illumination filters, and lens materials are conventionally used. These members can obtain a clearer image or the like by increasing the ultraviolet blocking efficiency.

  Since the ultraviolet blocking glass of the present invention can selectively and sharply block ultraviolet rays, it can be used as an optical filter material, an illumination filter, and a lens material that are advantageous for obtaining clear images and the like.

(4) Glasses for glasses It is desirable that glasses for glasses can sharply block ultraviolet rays contained in sunlight and various types of irradiation light from the viewpoint of protection for spectacle users.

  The ultraviolet blocking glass of the present invention is useful as a glass material for glasses because it can selectively and sharply block ultraviolet rays.

(5) Powdery UV-absorbing compounding material The ultraviolet blocking glass of the present invention can be used as an ultraviolet absorber in a powder state by selectively and sharply blocking ultraviolet rays. An ultraviolet absorber can also be used in combination with other things. Although the average particle diameter of powder is not limited, about 1-10 micrometers is preferable. Specifically, by blending with a resin composition, a coating composition or the like in a powder state, it is possible to impart ultraviolet absorbing ability to a resin product, a coating film or the like, and to improve the weather resistance, fading property and the like.

(6) Glass material in curing equipment for ultraviolet curable resin In order to cure the ultraviolet curable resin, a light source that irradiates high-energy ultraviolet rays, such as a high-pressure mercury lamp and a metal halide lamp, is used. Such high-energy ultraviolet rays are indispensable for curing the resin, but from the viewpoints of ensuring the safety of workers and preventing the deterioration of the facilities, irradiation to other than necessary areas should be avoided.

  The ultraviolet blocking glass of the present invention is useful as a glass material for monitoring windows in such curing equipment. By using it as a monitoring window glass material, the eyes of the operator can be reliably protected. Moreover, when arrange | positioning in the aspect which coat | covers various facilities by using the said glass as a protective material, degradation of facilities can be prevented.

Production method of ultraviolet blocking glass The production method of the ultraviolet blocking glass of the present invention is not particularly limited, and the raw materials may be blended so as to have the above-mentioned predetermined composition and processed according to a known glass production method.

  Although it does not specifically limit as a raw material (glass raw material) of each component in glass, The oxide, carbonate, sulfate, nitrate, hydroxide, etc. of each metal are mentioned.

  In the production of UV blocking glass, for example, the above raw materials are prepared so as to finally have a predetermined composition, melted, stirred and clarified at a temperature of about 1200 to 1500 ° C., then poured into a mold, during cooling or after cooling Heat treatment is performed at a temperature of about 450 to 700 ° C. for about 0.1 to 5 hours, and processing such as cutting and polishing is performed.

  In the cooling / heat treatment step, it is preferable to control the temperature conditions so that thermal distortion does not occur in the glass. The cooling rate is preferably about 10 to 100 ° C./hr, more preferably about 30 to 50 ° C./hr. The heating rate is preferably about 10 to 100 ° C./hr, more preferably about 30 to 70 ° C./hr.

The ultraviolet blocking glass of the present invention has a high visible light transmittance, and a sharp blocking effect is obtained in the range of 315 to 355 nm. Specifically, in a preferred embodiment, light having a wavelength of 250 to 800 nm is incident (from a direction perpendicular to the plate surface of the glass plate) on a glass plate having a thickness of 2.5 mm (the ultraviolet blocking glass of the present invention). range when the transmittance was measured, the center wavelength of the transmittance of 5% of the wavelength (lambda ₁₎ and the transmittance 72% of a wavelength _{(λ 2) ((λ 1} + λ 2) / 2) is 315~355nm Te to have the distance between the transmission ratio of 5% of the wavelength (lambda ₁₎ and the transmittance 72% of a wavelength _{(λ 2) (λ 2 -λ} 1) is within 30 nm. That is, the ultraviolet blocking glass of the present invention has a high visible light transmittance and a sharp blocking function with a narrow wavelength slope near the boundary between visible light and ultraviolet light as compared with conventional products.

6 is a graph showing spectral characteristics of each glass of Example 1 and Comparative Example 1. It is a graph which shows the spectral characteristics after UV irradiation of each glass of Example 1 and Comparative Example 1.

  The present invention will be specifically described below with reference to examples and comparative examples. However, the present invention is not limited to the examples.

Examples 1 to 5 and Comparative Example 1
As shown in Table 1, each glass raw material was weighed and prepared, melted in a platinum crucible at 1400 ° C., stirred, clarified, poured into a carbon mold, and cooled to room temperature. After cooling, it was cut and polished to obtain an ultraviolet transmissive glass having a thickness of 2.5 mm.
(Spectral characteristic measurement)
The spectral characteristics of each glass were measured by irradiating with a wavelength in the range of 250 to 800 nm. The spectral characteristics of the glasses obtained in Example 1 and Comparative Example 1 are shown in FIG.
(Solarization resistance)
Further, the glass was irradiated for 60 minutes at an intensity of 80 mW / cm ² using a metal halide lamp by a Ushio UV irradiation apparatus, and then naturally cooled in the apparatus for 30 minutes, and then the spectral characteristics were measured again.

  Irradiation distance: 130mm (Lamp-housing = 40mm + housing-sample = 90mm)

In Table 1, the center wavelength represents the center wavelength of the transmittance of 5% of the wavelength (lambda ₁₎ and the transmittance 72% of the wavelength of each spectral characteristics _{(λ 2) ((λ 1} + λ 2) / 2) . The wavelength slope width indicates the interval (λ ₂ -λ ₁₎ between the transmittance 5% of a wavelength (lambda ₁₎ and the transmittance 72% of the wavelength of each spectral characteristics (lambda _2), the wavelength inclination width The smaller one is evaluated as having a sharp blocking function.

  As is clear from the results in Table 1, it can be seen that the ultraviolet blocking glasses prepared in Examples 1 to 5 have a high visible light transmittance and a narrow and sharp blocking function with a wavelength inclination width within 30 nm. On the other hand, it can be seen that the ultraviolet blocking glass produced in Comparative Example 1 has an insufficient ultraviolet blocking effect, has a relatively large wavelength inclination width, and is inferior in blocking function than the examples.

  As is clear from the results shown in FIG. 2, the solarization resistance is hardly observed in Example 1 and the solarization resistance is high. Similar results were shown in other examples. On the other hand, in Comparative Example 1, a clear change was observed in the spectral characteristics, indicating that the solarization resistance effect was insufficient.

Claims (1)

The total amount of glass is 100% by weight, and the oxide composition is
(1) P ₂ O ₅ : 65 to 85% by weight,
_{(2) Al 2 O 3:} 5~17 wt%,
(3) MgO: 0-10 wt%, CaO: 0-10 wt%, SrO: 0-10 wt%, BaO: 0-12 wt% and ZnO: 0-10 wt%, MgO, CaO, 2 to 18% by weight as the total amount of SrO, BaO and ZnO,
₍₄₎ TiO 2: 0.05~2.5 wt%,
_{(5) B 2 O 3:} 0~10 wt%, and ₍₆₎ SiO 2: 0~5 wt%
A sunscreen glass consisting phosphate type glass containing,
When light having a wavelength of 250 to 800 nm is incident on the ultraviolet blocking glass having a thickness of 2.5 mm and the transmittance is measured, the center wavelength between the wavelength of 5% transmittance and the wavelength of 72% transmittance is 315 to 315. An ultraviolet blocking glass having a wavelength of 355 nm and an interval between a wavelength of 5% transmittance and a wavelength of 72% transmittance within 30 nm .

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