Lead-free long-wave ultraviolet-transmitting platinum group silicate glass and glass products

Abstract

The present invention provides a lead-free platinum-group silicate glass and glass products that are transparent to long-wave ultraviolet rays. The composition of the lead-free platinum-group silicate glass that is transparent to long-wave ultraviolet rays includes, by weight percentage: SiO2 60%-75%, Al2O3 1%-5%, B2O3 2%-10%, BaO 5%-12%, Na2O 5%-15%, K2O 5%-10%, CoO 0.1%-4%, and NiO 0.1%-5%. The advantages of the lead-free platinum-group silicate glass that is transparent to long-wave ultraviolet rays of the present invention are: using alkaline earth oxides instead of heavy metal PbO, there is no pollution to the environment; the transmittance of long-wave ultraviolet rays with a wavelength of 365nm is greater than 60% when the glass thickness is 1mm, and it can cut off visible light; there are no sand spots or air lines on the glass surface, and it can be well sealed with Dumet wire or other amber-group glasses, and the long-wave ultraviolet lamp (UVA lamp) produced by the glass has good sealing performance and a long service life.

Description

Technical Field

[0001] The present invention relates to the field of materials, and in particular to a lead-free long-wave ultraviolet-transmitting platinum group silicate glass and a glass product. Background Art

[0002] Long-wave ultraviolet light with a wavelength of 320nm-400nm has strong penetrating power. The ultraviolet energy in this band is equivalent to the energy of most chemical bonds, which easily triggers photochemical reactions and is commonly used for photocuring. However, it is undesirable to transmit visible light while transmitting long-wave ultraviolet light. Summary of the Invention

[0003] The present invention aims to provide a lead-free, long-wave ultraviolet-transmissive platinum silicate glass and glass products thereof. The lead-free, long-wave ultraviolet-transmissive platinum silicate glass of the present invention belongs to the platinum group glass group of electronic glass. It can be effectively welded with Dumet or other amber group glasses, resulting in a glass surface free of sand spots and air lines. The long-wave ultraviolet lamp (UVA lamp) made from it has excellent sealing properties and a long lifespan. The platinum silicate glass comprises the following components in weight percentage:

[0004] SiO2 60%-75%,

[0005] Al2O3 1%-5%,

[0006] B2O3 2%-10%,

[0007] BaO 5%-12%,

[0008] Na2O 5%-15%,

[0009] K2O 5%-10%,

[0010] CoO 0.1%-4%,

[0011] NiO 0.1%-5%.

[0012] Furthermore, the weight percentage of SiO2 in the platinum group silicate glass is 64%-74%.

[0013] Furthermore, the weight percentage of Al2O3 in the platinum group silicate glass is 2%-5%.

[0014] Furthermore, the weight percentage of B2O3 in the platinum group silicate glass is 2%-8%.

[0015] Furthermore, the weight percentage of BaO in the platinum group silicate glass is 5%-10%.

[0016] Furthermore, the weight percentage of Na2O in the platinum group silicate glass is 6%-14%.

[0017] Furthermore, the weight percentage of K2O in the platinum group silicate glass is 5%-8%.

[0018] Furthermore, the weight percentage of CoO in the platinum group silicate glass is 0.1%-3%.

[0019] Furthermore, the weight percentage of NiO in the platinum group silicate glass is 0.1%-4%.

[0020] Furthermore, the platinum group silicate glass with a thickness of 1 mm has a transmittance of >60% for a wavelength of 365 nm and cuts off visible light.

[0021] Furthermore, the expansion coefficient of the platinum group silicate glass at 20°C-200°C is (80-98)*10 -7 .

[0022] The present invention also provides a glass product made of the lead-free long-wave ultraviolet-transmitting platinum silicate glass, which includes but is not limited to at least any one of the following:

[0023] -Long-wave ultraviolet-transmitting glass tube;

[0024] -Long-wave UV-transmitting glass shell;

[0025] -Long-wave UV-transmitting glass;

[0026] -Long-wave ultraviolet light tube;

[0027] -Long-wave ultraviolet light bulb;

[0028] -Transparent long-wave ultraviolet lamp beads;

[0029] -Transparent long wave ultraviolet light.

[0030] The beneficial effects of the present invention are as follows: using alkaline earth oxides instead of heavy metal PbO will not cause pollution to the environment; the transmittance of long-wave ultraviolet rays with a wavelength of 365nm is greater than 60% when the glass thickness is 1mm, and the glass can cut off visible light; the glass surface has no sand spots or air lines, and can be well sealed with Dumet or other amber glass, so the long-wave ultraviolet lamp (UVA lamp) prepared by the invention has good sealing performance and long service life; the expansion coefficient at 20℃-200℃ is (80-98)*10 -7 . BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the relationship between wavelength and transmittance of the 1 mm thick lead-free long-wave ultraviolet transparent platinum silicate glass of the present invention. DETAILED DESCRIPTION

[0032] The lead-free long-wave ultraviolet-transmitting platinum silicate glass of the present invention is composed of the following components in weight percentage: SiO2 60%-75%, Al2O3 1%-5%, B2O3 2%-10%, BaO 5%-12%, Na2O 5%-15%, K2O 5%-10%, CoO 0.1%-4%, and NiO 0.1%-5%.

[0033] The SiO2 content of the lead-free, long-wave UV-transparent platinum silicate glass of the present invention is 60%-75% by weight, preferably 64%-74%. SiO2 is the main component of silicate glass, forming the glass's skeleton in the form of a network of silicon-oxygen tetrahedrons. A SiO2 content exceeding 75% makes the glass 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. A lower SiO2 content results in poor chemical stability.

[0034] 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.

[0035] The weight percentage of Al2O3 in the lead-free, long-wave UV-transparent platinum silicate glass of the present invention is 1% to 5%, preferably 2% to 5%. Al2O3 significantly improves the devitrification of glass. However, when Al2O3 exceeds 6%, the viscosity of the glass solution becomes too high, and bubble-free glass cannot be obtained. On the other hand, if Al2O3 is less than 1%, the aforementioned effect cannot be achieved, making homogeneous glass difficult to produce and stable forming difficult.

[0036] The lead-free, long-wave UV-transparent platinum silicate glass of the present invention contains B2O3 in an amount ranging from 2% to 10% by weight, preferably from 2% to 8%. B2O3 fluxing reduces the glass viscosity and accelerates the clarification process. Too little B2O3 will have no effect, while too much will reduce the chemical stability of the glass.

[0037] The lead-free, long-wave UV-transparent platinum silicate glass of the present invention contains (Na2O + K2O) in a weight percentage of 10%-25%, preferably 11%-22%. The lead-free, long-wave UV-transparent platinum silicate glass of the present invention includes Na2O in a weight percentage of 5%-15% and K2O in a weight percentage of 5%-10%. Na2O and K2O significantly reduce glass viscosity, promote glass melting, and serve as excellent fluxing agents. They also largely determine the glass's expansion coefficient. The simultaneous introduction of Na2O and K2O creates a dual-alkali effect, improving the chemical stability of the glass.

[0038] The lead-free, long-wave ultraviolet-transparent platinum silicate glass of the present invention contains BaO in an amount of 5% to 12% by weight, preferably 5% to 10%. BaO ions fill the glass network, blocking ion migration channels, increasing the resistivity of the glass, and also acting as a flux, promoting glass melting. Too little BaO will have no effect, while too much will cause the glass to lose clarity.

[0039] The lead-free long-wave ultraviolet-transmitting platinum silicate glass of the present invention contains CoO in a weight percentage of 0.1%-4%, preferably 0.1%-3%. CoO is mainly used as a colorant in the glass to shield visible light.

[0040] The lead-free, long-wave ultraviolet-transparent platinum silicate glass of the present invention contains NiO in an amount of 0.1% to 5% by weight, preferably 0.1% to 4% by weight. NiO is mainly used as a colorant in the glass and can also improve the chemical stability of the glass.

[0041] The simultaneous introduction of B2O3 and BaO into the lead-free long-wave ultraviolet-transmitting platinum silicate glass of the present invention can also reduce the attenuation amplitude of the glass.

[0042] A small amount of a clarifier commonly used in glass production is used in the batch material of the lead-free long-wave ultraviolet transparent platinum group silicate glass of the present invention.

[0043] The glass of the present invention belongs to the platinum group glass in electronic glass. When manufacturing a long-wave ultraviolet lamp, it needs to be sealed with Dumet wire or other platinum group glass in electronic glass, so that the manufactured long-wave ultraviolet lamp has low residual stress, firm sealing, and no slow leakage, thereby ensuring stable performance and excellent quality of the long-wave ultraviolet lamp.

[0044] The lead-free, long-wave ultraviolet-transmitting platinum silicate glass of the present invention has a transmittance of long-wave ultraviolet rays with a wavelength of 320 nm to 400 nm based on the transmittance at a peak wavelength of 365 nm. The transmittance of long-wave ultraviolet rays with a wavelength of 365 nm is greater than 60% when the glass thickness is 1 mm. The long-wave ultraviolet lamp produced in this manner has excellent performance.

[0045] Figure 1 The diagram shows the relationship between wavelength and transmittance of a 1mm thick lead-free long-wave ultraviolet-transmitting platinum silicate glass according to the present invention. When the glass is 1mm thick, the transmittance at a wavelength of 365nm is >60%, and the expansion coefficient at 20°C-200°C is (80-98)*10 -7 ,from Figure 1 It can be seen that the platinum group silicate glass of the present invention has good transmittance for long-wave ultraviolet rays with a wavelength of 320nm-400nm, and the transmittance reaches a peak at a wavelength of 365nm. It has a good cutoff effect on visible light, that is, it is not transparent to visible light.

[0046] Table 1 below shows the expansion coefficients and transmittances of the various components of the lead-free, long-wave ultraviolet-transmitting platinum silicate glass of the present invention at different contents. The transmittance is the transmittance at a glass thickness of 1 mm and a wavelength of 365 nm:

[0047] Table 1

[0048]

[0049]

[0050] The data from the examples shown in Table 1 demonstrate that the lead-free, long-wave UV-transmitting platinum-group silicate glass of the present invention contains no lead, mercury, chromium, or cadmium, and complies with EU RoHS standards. Furthermore, variations in the components of the platinum-group silicate glass of the present invention affect the glass's expansion coefficient and transmittance.

[0051] 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 lead-free, long-wave ultraviolet-transmitting platinum-group silicate glass required for the production of long-wave ultraviolet lamps.

Claims

1. A lead-free long-wave ultraviolet-transmitting platinum group silicate glass, characterized in that: It is composed of the following ingredients in percentage by weight: SiO2 60%-75%, Al2O3 1%-5%, B2O3 3.1%-10%, BaO 5%-12%, Na2O 5%-15%, K2O 5.7%-10%, CoO 0.1%-4%, NiO 0.1%-5%.

2. The lead-free long-wave ultraviolet-transmitting platinum group silicate glass according to claim 1, characterized in that: The weight percentage of SiO2 in the platinum group silicate glass is 64%-74%.

3. The lead-free long-wave ultraviolet-transmitting platinum group silicate glass according to claim 1, characterized in that: The weight percentage of Al2O3 in the platinum group silicate glass is 2%-5%.

4. The lead-free long-wave ultraviolet-transmitting platinum silicate glass according to claim 1, characterized in that: The weight percentage of B2O3 in the platinum group silicate glass is 3.1%-8%.

5. The lead-free long-wave ultraviolet-transmitting platinum group silicate glass according to claim 1, characterized in that: The weight percentage of BaO in the platinum group silicate glass is 5%-10%.

6. The lead-free long-wave ultraviolet transparent platinum group silicate glass according to claim 1, characterized in that: The weight percentage of Na2O in the platinum group silicate glass is 6%-14%.

7. The lead-free long-wave ultraviolet transparent platinum group silicate glass according to claim 1, characterized in that: The weight percentage of K2O in the platinum group silicate glass is 5.7%-8%.

8. The lead-free long-wave ultraviolet-transmitting platinum group silicate glass according to claim 1, characterized in that: The weight percentage of CoO in the platinum group silicate glass is 0.1%-3%.

9. The lead-free long-wave ultraviolet-transmitting platinum group silicate glass according to claim 1, characterized in that: The weight percentage of NiO in the platinum group silicate glass is 0.1%-4%.

10. A glass product made of the lead-free, long-wave ultraviolet-transmitting platinum silicate glass according to any one of claims 1 to 9, characterized in that: The glass product comprises at least one of the following: -Long-wave ultraviolet-transmitting glass tube; -Long-wave UV-transmitting glass shell; -Long-wave UV-transmitting glass; -Long-wave ultraviolet light tube; -Long-wave ultraviolet light bulb; -Transparent long-wave ultraviolet lamp beads; -Transparent long wave ultraviolet light.

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