Black platinum group silicate glass transparent to medium-wave ultraviolet rays and glass products

Abstract

The present invention provides a black platinum-group silicate glass and glass products that are transparent to medium-wave ultraviolet light. The platinum-group silicate glass comprises, by weight, 65%-75% SiO2, 1%-8% B2O3, 2%-10% CaO, 1%-5% ZnO, 5%-13% Na2O, 1%-10% K2O, 0.1%-1% TiO2, 0.1%-5% NiO, and 0.1%-2% CoO. The resulting glass has a transmittance of 300nm at a thickness of 1mm, 30%-60%, and a coefficient of expansion of 80*10 at 20°C-200°C. ‑7 Up to 99*10 ‑7 The advantages of the black medium-wave ultraviolet-transmitting platinum silicate glass of the present invention are: it can transmit UVB light but not visible light; the glass surface has no air lines and can be well sealed with Dumet wire or other platinum glass to make medium-wave ultraviolet lamps, which have high energy efficiency, good sealing, and long service life. It is also suitable for making moonlight lamps.

Description

Technical Field

[0001] The present invention relates to the field of materials, and in particular to a black platinum silicate glass transparent to medium-wave ultraviolet rays and a glass product thereof. Background Art

[0002] Ultraviolet (UVB) rays with a wavelength of 280-320nm promote mineral metabolism and vitamin D formation in humans and animals, enhancing calcium absorption and promoting animal growth. However, some nocturnal plants and animals prefer UVB rays while not being able to transmit visible light. Therefore, there is a need for glass that transmits UVB rays while not transmitting visible light. Summary of the Invention

[0003] The present invention provides a black, UV-transparent platinum-group silicate glass and glass products. The platinum-group silicate glass of the present invention belongs to the platinum-group glass group of electronic glass. It can be effectively welded with Dumet wire or other platinum-group glasses, resulting in no air lines on the glass surface. The UV-lights produced from this glass exhibit high energy efficiency, a tight seal, no slow air leaks, and minimal attenuation. The platinum-group silicate glass comprises the following components in percentage by weight:

[0004] SiO2 65%-75%,

[0005] B2O3 1%-8%,

[0006] CaO 2%-10%,

[0007] ZnO 1%-5%,

[0008] Na2O 5%-13%,

[0009] K2O 1%-10%,

[0010] TiO2 0.1%-1%.

[0011] NiO 0.1%-5%,

[0012] CoO 0.1%-2%.

[0013] Furthermore, the weight percentage of SiO2 in the platinum group silicate glass is 65%-71%.

[0014] Furthermore, the weight percentage of B2O3 in the platinum group silicate glass is 1%-7%.

[0015] Furthermore, the weight percentage of CaO in the platinum group silicate glass is 2%-8%.

[0016] Furthermore, the weight percentage of ZnO in the platinum group silicate glass is 2%-5%.

[0017] Furthermore, the weight percentage of Na2O in the platinum group silicate glass is 6%-13%.

[0018] Furthermore, the weight percentage of K2O in the platinum group silicate glass is 2%-9%.

[0019] Furthermore, the weight percentage of TiO2 in the platinum group silicate glass is 0.1%-0.8%.

[0020] Furthermore, the weight percentage of NiO+CoO in the platinum group silicate glass is 0.2%-5%.

[0021] The present invention also provides a glass product made of the black medium-wave ultraviolet-transmitting platinum silicate glass, which includes but is not limited to at least any one of the following:

[0022] - UV-transmitting glass tube;

[0023] - UV-transparent glass shell;

[0024] - UV-transparent glass sheets;

[0025] - Transparent UV light.

[0026] The medium-wave ultraviolet-transmitting lamp at least comprises a medium-wave ultraviolet-transmitting lamp tube, a medium-wave ultraviolet-transmitting bulb, and a medium-wave ultraviolet-transmitting lamp bead.

[0027] The beneficial effects of the present invention are: when the glass thickness is 1mm, the transmittance at 300nm is 30%-60%; the expansion coefficient at 20℃-200℃ is 80*10 -7 Up to 99*10 -7 The glass is also non-transmissive to visible light. The glass surface is air-line-free and can be well sealed with Dumet wire or other platinum-group glasses. The resulting UVB lamps are energy-efficient, well-sealed, and have a long service life. Furthermore, the black UVB-transmissive platinum-group silicate glass of the present invention can be used to make moonlight lamps. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram showing the relationship between the wavelength of medium-wave ultraviolet light and the transmittance of the 1 mm thick platinum group silicate glass of the present invention. DETAILED DESCRIPTION

[0029] The black medium-wave ultraviolet-transparent platinum silicate glass of the present invention is composed of the following components in weight percentage: SiO2 65%-75%, B2O3 1%-8%, CaO 2%-10%, ZnO 1%-5%, Na2O 5%-13%, K2O 1%-10%, TiO2 0.1%-1%, NiO 0.1%-5%, and CoO 0.1%-2%.

[0030] The SiO2 content of the black, UV-transparent platinum silicate glass of the present invention is 65%-75% by weight, preferably 65%-71%. SiO2 is the main component of silicate glass, forming the glass's skeleton in the form of a network of silicon-oxygen tetrahedra. When the SiO2 content exceeds 75%, the glass becomes difficult to melt, requiring higher melting temperatures and longer melting times, resulting in excessive energy consumption and reduced production efficiency. It also increases the glass's annealing and softening temperatures, and reduces its coefficient of expansion. However, when the SiO2 content is too low, the glass suffers from poor chemical stability.

[0031] Here, it should be noted that the glass in the present invention belongs to the platinum group glass in the electronic glass group and is mainly composed of silicate, so it is called platinum group silicate glass.

[0032] The black, UV-transparent platinum silicate glass of the present invention contains B2O3 in an amount of 1% to 8% by weight, preferably 1% to 7% by weight. B2O3 fluxing reduces the glass viscosity and accelerates the clarification process. Too little B2O3 is ineffective, while too much reduces the chemical stability of the glass.

[0033] The black, UV-transparent platinum silicate glass of the present invention contains CaO in an amount of 2% to 10% by weight, preferably 2% to 8%. CaO, along with other alkaline earth metal oxides, can reduce the viscosity of the glass, promote melting, and improve the chemical stability of the glass. Too little CaO is ineffective, while too much can cause phase separation in the glass.

[0034] The black, UV-transparent platinum silicate glass of the present invention contains ZnO in an amount of 1% to 5% by weight, preferably 2% to 5%. ZnO significantly improves the chemical stability of glass and, when used in combination with other alkaline earth metal oxides, reduces glass viscosity and promotes melting and clarification. Too little ZnO is ineffective, while too much ZnO can cause phase separation, devitrification, and opacification in the glass.

[0035] The black, UV-transparent platinum silicate glass of the present invention contains (Na2O + KO) in a weight percentage of 6%-23%, preferably 8%-22%. The UV-transparent glass of the present invention includes 5%-13% Na2O and 1%-10% KO. Na2O and KO significantly reduce glass viscosity and promote glass melting, acting as excellent fluxing agents. They also largely determine the glass's coefficient of expansion. Too little of these two elements is ineffective, resulting in a low coefficient of expansion. Excessive amounts of these elements can reduce the chemical stability of the glass. The simultaneous introduction of Na2O and KO creates a dual-alkali effect, improving the chemical stability of the glass.

[0036] The black medium-wave ultraviolet-transmitting platinum silicate glass of the present invention contains TiO2 in an amount of 0.1% to 1% by weight, preferably 0.1% to 0.8%. TiO2 in the present invention mainly plays the role of shielding short-wave ultraviolet rays and regulating the peak value of medium-wave ultraviolet rays.

[0037] The black UV-transmitting platinum silicate glass of the present invention contains NiO+CoO in a weight percentage of 0.2%-7%, preferably 0.2%-5%. NiO+CoO mainly plays a role in shielding visible light.

[0038] A small amount of reducing agent and clarifying agent commonly used in glass production is used in the batch material of the platinum group silicate glass of the present invention.

[0039] Figure 1 The diagram shows the relationship between the wavelength and transmittance of the medium-wave ultraviolet light of the 1mm thick platinum group silicate glass of the present invention. When the glass is 1mm thick, the transmittance at a wavelength of 300nm is 30%-60%, and the expansion coefficient at 20℃-200℃ is 80*10 -7 Up to 99*10 -7 ,from Figure 1 It can be seen that the platinum group silicate glass of the present invention has a good transmittance to medium-wave ultraviolet rays and has a good suppression of visible light, that is, it is not transparent to visible light.

[0040] Table 1 below shows the expansion coefficient and transmittance corresponding to different contents of each component in the platinum group silicate glass of the present invention, where the transmittance is the transmittance at a glass thickness of 1 mm and a wavelength of 300 nm:

[0041] Table 1

[0042] Glass composition (wt%) 1 2 3 4 5 <![CDATA[SiO2]]> 66.5 69.4 68.5 64.9 72.1 <![CDATA[B2O3]]> 5.5 3.8 5.1 4.7 5.1 CaO 3.7 4.1 4.1 5.4 4.1 ZnO 4.8 5.1 5.7 4.9 4.3 <![CDATA[Na2O]]> 10.3 10.1 9.8 12.2 7.3 <![CDATA[K2O3]]> 6.6 4.6 4.1 5.6 4.9 TiO 0.3 0.5 0.4 0.7 0.2 NiO 1.8 2.1 1.8 1.4 1.2 CoO 0.5 0.3 0.5 0.2 0.8 Total content 100 100 100 100 100 <![CDATA[Coefficient of expansion: δ * 10 -7 (20 °C - 200 °C)]]> 88.9 84.2 83.3 92.4 82.8 Transmittance (glass thickness 1mm, wavelength 300nm) 48.5 46.8 47.2 41.8 49.8

[0043] As can be seen from the data in Table 1, the platinum-group silicate glass of the present invention does not contain elements such as lead, mercury, chromium, and cadmium, and complies with EU RoHS standards. Furthermore, variations in the components of the platinum-group silicate glass of the present invention can affect the thermal expansion coefficient and transmittance of the glass.

[0044] It should be noted here that those skilled in the art should understand that the above embodiments are merely exemplary and that various changes, substitutions, and modifications may be made without departing from the spirit and scope of the present application to achieve the black, medium-wave ultraviolet-transparent platinum group silicate glass required for making moonlight lamps.

Claims

1. A black platinum group silicate glass transparent to medium-wave ultraviolet light, characterized in that: It is composed of the following ingredients in percentage by weight: SiO2 65%-75%, B2O3 1%-8%, CaO 2%-10%, ZnO 1%-5%, Na2O 5%-13%, K2O 1%-10%, TiO2 0.1%-1%, NiO 0.1%-5%, CoO 0.1%-2%.

2. The platinum group silicate glass transparent to medium-wave ultraviolet light according to claim 1, characterized in that: The weight percentage of SiO2 in the glass is 65%-71%.

3. The platinum group silicate glass transparent to medium-wave ultraviolet light according to claim 1, characterized in that: The weight percentage of B2O3 in the glass is 1%-7%.

4. The platinum group silicate glass transparent to medium-wave ultraviolet light according to claim 1, characterized in that: The weight percentage of CaO in the glass is 2%-8%.

5. The platinum group silicate glass transparent to medium-wave ultraviolet light according to claim 1, characterized in that: The weight percentage of ZnO in the glass is 2%-5%.

6. The platinum group silicate glass transparent to medium-wave ultraviolet light according to claim 1, characterized in that: The weight percentage of Na2O in the glass is 6%-13%.

7. The platinum group silicate glass transparent to medium-wave ultraviolet light according to claim 1, characterized in that: The weight percentage of K2O in the glass is 2%-9%.

8. The platinum group silicate glass transparent to medium-wave ultraviolet light according to claim 1, characterized in that: The weight percentage of TiO2 in the glass is 0.1%-0.8%.

9. The platinum group silicate glass transparent to medium-wave ultraviolet light according to claim 1, characterized in that: The weight percentage of NiO+CoO in the glass is 0.2%-5%.

10. A glass product made of the black, ultraviolet-transparent platinum group silicate glass according to any one of claims 1 to 9, characterized in that: The glass product comprises at least any one of the following: - UV-transmitting glass tube; - UV-transparent glass shell; - UV-transparent glass sheets; - Transparent UVB lamp.

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