Platinum group high-barium silicate glass capable of transmitting short-wave ultraviolet rays and glass product

Abstract

The invention provides platinum group high-barium silicate glass capable of transmitting short-wave ultraviolet rays and a glass product. The platinum group high-barium silicate glass comprises the following components in percentage by weight: 60%-75% of SiO2, 1%-10% of B2O3, 15%-25% of BaO, 1%-10% of Na2O and 10%-22% of K2O. The platinum group high-barium silicate glass capable of transmitting short-wave ultraviolet rays has the advantages that the transmittance of the short-wave ultraviolet rays with the wavelength of 253.7 nm is gt when the thickness of the glass is 1mm; 50%; heavy metals such as lead are not contained, so that the environment is not polluted; the surface of the glass is free of sand points and air lines, the glass can be well sealed with Dumet wires or other Perot glass in a fusion mode, and the manufactured short-wave ultraviolet lamp (UVC lamp) is good in sealing performance, free of the slow air leakage phenomenon, long in service life, small in light attenuation and good in sterilization effect.

Description

Technical Field

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

[0002] Short-wave ultraviolet rays with a wavelength of 200-275nm are usually called short-wave sterilizing ultraviolet rays. Many studies and reports have shown that when organisms are exposed to short-wave ultraviolet rays of 200-275nm, the cell walls of organisms can be broken, short-wave ultraviolet rays can destroy biological DNA and RNA, and short-wave ultraviolet rays can kill 99.9% of viruses and bacteria. However, the penetration rate of short-wave ultraviolet rays is very weak. The transmittance of ordinary glass to short-wave ultraviolet rays is about 2%, and the short-wave ultraviolet rays contained in sunlight are almost completely absorbed by the ozone layer and cannot reach the ground. Summary of the invention

[0003] The purpose of the present invention is to provide a short-wave ultraviolet-transmitting platinum group high-barium silicate glass and a glass product thereof. The short-wave ultraviolet-transmitting platinum group high-barium silicate glass of the present invention belongs to the platinum group glass in the electronic glass group, can transmit short-wave ultraviolet rays of 200-275nm, has a high transmittance, and the transmittance to the wavelength of 253.7nm is greater than 50%.

[0004] The glass of the present invention can be well sealed with Dumet wire or other platinum group glasses, and the glass surface has no sand spots and air lines. The short-wave ultraviolet sterilization lamp (UVC lamp) made of the glass has good sealing performance, no slow air leakage, long service life, low light attenuation and good sterilization effect.

[0005] The platinum group high barium silicate glass comprises the following components in weight percentage:

[0006] SiO2 60%-75%,

[0007] B2O3 1%-10%,

[0008] BaO 15%-25%,

[0009] Na2O 1%-10%,

[0010] K2O 10%-22%.

[0011] Furthermore, the weight percentage of SiO2 in the platinum group high-barium silicate glass is 60%-74%.

[0012] Furthermore, the weight percentage of B2O3 in the platinum group high-barium silicate glass is 1%-5%.

[0013] Furthermore, the weight percentage of BaO in the platinum group high-barium silicate glass is 15%-22%.

[0014] Furthermore, the weight percentage of Na2O in the platinum group high-barium silicate glass is 3%-10%.

[0015] Furthermore, the weight percentage of K2O in the platinum group high-barium silicate glass is 10%-20%.

[0016] Furthermore, the transmittance of the platinum group high-barium silicate glass with a thickness of 1 mm at a wavelength of 253.7 nm is >50%.

[0017] Furthermore, the expansion coefficient of the platinum group high-barium silicate glass at 20°C-200°C is (80-98)*10 -7 .

[0018] The present invention also provides a glass product made of the short-wave ultraviolet-transmitting platinum-group high-barium silicate glass, which includes but is not limited to at least any one of the following:

[0019] -Short-wave ultraviolet transparent glass tube;

[0020] -Short-wave UV-transmitting glass shell;

[0021] -Short-wave UV-transmitting glass;

[0022] -Short-wave ultraviolet light tube;

[0023] -Short-wave ultraviolet light bulb;

[0024] -Transmit short-wave ultraviolet lamp beads;

[0025] -Transmitted by short-wave ultraviolet light.

[0026] The beneficial effects of the present invention are as follows: the glass does not contain heavy metals such as lead, and will not cause pollution to the environment; the glass of the present invention can be well sealed with Dumet wire or other platinum group glasses, and there are no sand spots or air lines on the glass surface; the short-wave ultraviolet germicidal lamp (UVC lamp) made of the glass has good sealing performance, no slow air leakage, long service life, low light attenuation, and good sterilization effect; the short-wave ultraviolet light with a wavelength of 253.7nm has a transmittance of more than 50% when the glass thickness is 1mm; the expansion coefficient at 20℃-200℃ is (80-98)*10 -7 . BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic diagram showing the relationship between the wavelength and transmittance of the 1 mm thick platinum-group high-barium silicate glass that transmits short-wave ultraviolet rays according to the present invention. DETAILED DESCRIPTION

[0028] The short-wave ultraviolet-transmitting platinum-group high-barium silicate glass of the present invention is composed of the following components in weight percentage: SiO2 60%-75%, B2O3 1%-10%, BaO 15%-25%, Na2O 1%-10%, and K2O 10%-22%.

[0029] The weight percentage of SiO2 in the short-wave ultraviolet-transmitting platinum-group high-barium silicate glass of the present invention is 60%-75%, preferably 60%-74%. SiO2 is the main body of silicate glass, and forms the skeleton of glass in the form of a network of silicon-oxygen tetrahedrons. When the content of SiO2 exceeds 75%, the glass is difficult to melt, and the melting temperature and melting time need to be increased, resulting in excessive energy consumption and reduced production efficiency, while also increasing the annealing temperature and softening temperature of the glass and reducing the expansion coefficient. Too little SiO2 will result in poor chemical stability of the glass.

[0030] 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.

[0031] The short-wave ultraviolet-transmitting platinum group high-barium silicate glass of the present invention contains B2O3, the weight percentage of which is 1%-10%, preferably 1%-5%. B2O3 fluxing reduces the glass viscosity and accelerates the clarification process. Too little B2O3 content will not work, while too much B2O3 will reduce the chemical stability of the glass.

[0032] The short-wave ultraviolet-transmitting platinum group high-barium silicate glass of the present invention contains BaO, and its weight percentage is 15%-25%, preferably 15%-22%. BaO ions fill the network gaps of the glass, block the ion migration channel, increase the resistivity of the glass, and also have a fluxing effect to promote the melting of the glass. If the content of BaO is too little, it will not work, and if it is too much, the glass will easily lose transparency.

[0033] The simultaneous introduction of B2O3 and BaO into the short-wave ultraviolet-transmitting platinum-group high-barium silicate glass of the present invention can also reduce the attenuation amplitude of the glass.

[0034] The short-wave ultraviolet-transmitting platinum-group high-barium silicate glass of the present invention contains (Na2O+K2O), and the weight percentage thereof is 11%-32%, preferably 13%-30%. The short-wave ultraviolet-transmitting platinum-group high-barium silicate glass of the present invention includes Na2O, and the weight percentage thereof is 1%-10%, and the weight percentage of K2O is 10%-22%. Na2O and K2O can significantly reduce the viscosity of the glass and promote the melting of the glass, and are good fluxing agents. At the same time, they also largely determine the expansion coefficient of the glass. Too little of their content will not work, and the expansion coefficient will be too low. Too much of their content will reduce the chemical stability of the glass. The simultaneous introduction of Na2O and K2O will have a double alkali effect, and can improve the chemical stability of the glass.

[0035] A small amount of a clarifier commonly used in glass production is used in the batch material of the short-wave ultraviolet-transmitting platinum-group high-barium silicate glass of the present invention.

[0036] The glass of the present invention belongs to the platinum group glass in electronic glass. When making short-wave ultraviolet lamps, it must be sealed with Dumet wire or other platinum group glass in electronic glass. Therefore, the expansion coefficient of the glass of the present invention must match that of Dumet wire or other platinum group glass. If it does not match, a good sealing will not be obtained. The radial expansion coefficient of Dumet wire is (80-100)*10 －7 (20-350℃). The expansion coefficient of other platinum group glasses is (87-90)*10 －7 (20--200℃). The glass expansion coefficient of the present invention is 80*10 -7 Up to 98*10 -7 (20-200℃), it can be well sealed with Dumet wire or other platinum group glasses. The surface of the glass tube pulled out from the molten glass liquid is almost free of sand spots, air lines and stripes, so that the short-wave ultraviolet lamp produced has small residual stress, firm sealing and no slow air leakage, ensuring the stable performance and excellent quality of the short-wave ultraviolet lamp.

[0037] Figure 1 The schematic diagram shows the relationship between the wavelength and transmittance of the 1 mm thick platinum group high barium silicate glass that transmits short-wave ultraviolet rays of the present invention. When the glass thickness is 1 mm, the transmittance of short-wave ultraviolet rays with a wavelength of 253.7 nm is >50%, and the expansion coefficient under the condition of 20°C-200°C is (80-98)*10 -7 ,from Figure 1 It can be seen that the platinum group high-barium silicate glass of the present invention has a very good transmittance to short-wave ultraviolet rays with a wavelength of 200nm-275nm.

[0038] Table 1 below shows the expansion coefficient and transmittance of each component contained in the short-wave ultraviolet-transmitting platinum-group high-barium silicate glass of the present invention at different contents, wherein the transmittance is the transmittance at a glass thickness of 1 mm and a wavelength of 253.7 nm:

[0039] Table 1

[0040]

[0041]

[0042] It can be seen from the data of the embodiment shown in Table 1 that the short-wave ultraviolet-transmitting platinum-group high-barium silicate glass of the present invention does not contain elements such as lead, mercury, chromium, and cadmium, and complies with the EU RoHS standard. At the same time, the changes in the components contained in the platinum-group high-barium silicate glass of the present invention will affect the changes in the expansion coefficient and transmittance of the glass.

[0043] 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 short-wave ultraviolet-transmissive platinum-group high-barium silicate glass required for making short-wave ultraviolet lamps.

Claims

1. A platinum group high-barium silicate glass that is transparent to short-wave ultraviolet rays, characterized in that: Its composition by weight percentage includes: SiO2 60%-75%, B2O3 1%-10%, BaO 15%-25%, Na2O 1%-10%, K2O 10%-22%.

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

3. The short-wave ultraviolet-transmitting platinum-group high-barium silicate glass according to claim 1, characterized in that: The weight percentage of B2O3 in the platinum group high-barium silicate glass is 1%-5%.

4. The short-wave ultraviolet-transmitting platinum-group high-barium silicate glass according to claim 1, characterized in that: The weight percentage of BaO in the platinum group high-barium silicate glass is 15%-22%.

5. The short-wave ultraviolet-transmitting platinum-group high-barium silicate glass according to claim 1, characterized in that: The weight percentage of Na2O in the platinum group high-barium silicate glass is 3%-10%.

6. The short-wave ultraviolet-transmitting platinum-group high-barium silicate glass according to claim 1, characterized in that: The weight percentage of K2O in the platinum group high-barium silicate glass is 10%-20%.

7. The short-wave ultraviolet-transmitting platinum-group high-barium silicate glass according to claim 1, characterized in that: The transmittance of the platinum group high barium silicate glass with a thickness of 1 mm at a wavelength of 253.7 nm is >50%.

8. The short-wave ultraviolet-transmitting platinum-group high-barium silicate glass according to claim 1, characterized in that: The expansion coefficient of the platinum group high barium silicate glass at 20°C-200°C is (80-98)*10 -7 .

9. A glass product made of the short-wave ultraviolet-transmitting platinum group high-barium silicate glass according to any one of claims 1 to 8, characterized in that: The glass product comprises at least one of the following: -Short-wave ultraviolet transparent glass tube; -Short-wave UV-transmitting glass shell; -Short-wave UV-transmitting glass; -short-wave ultraviolet light tube; -short-wave ultraviolet light bulb; -short-wave ultraviolet light bead; -short-wave ultraviolet light lamp.

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