A flexible antibacterial glass that effectively inhibits the reduction of silver ions

Abstract

The invention relates to a flexible antibacterial glass that effectively inhibits the reduction of silver ions, and contains the following components in percentage by mass: SiO2 55-65%, Al2O3 16-25%, Na2O 5-12%, K2O 0.5-4%, MgO 2-8%, CaO 0-1%, ZrO 2 0-2%, Ag2O 0.1-1%, CoO 0.2-3.55%, and Na2S 0-0.5%. The above-mentioned raw materials are combined into a batch material for melting and forming. The advantages are that the flexible antibacterial glass well inhibits the reduction of silver ions into silver element and effectively controls the yellowing of the glass; the flexible glass has antibacterial properties, and compared with the ion exchange method that makes the flexible glass have an antibacterial effect, due to the thin thickness of the flexible glass, the present invention will not damage the strength and toughness of the flexible glass, the antibacterial activity level is II-level antibacterial R ≥ 3, and the visible light transmittance of 380nm-780nm is ≥ 91%.

Description

Technical Field

[0001] The present invention relates to flexible antibacterial glass, and particularly to a flexible antibacterial glass that can effectively inhibit the reduction of silver ions. Background Art

[0002] Bacteria and molds, as pathogenic bacteria, pose great harm to humans, animals and plants. Therefore, products with bactericidal and antibacterial effects have attracted more and more attention.

[0003] As a key substrate for display products, with the rapid development of the display industry, electronic glass is constantly tending to be larger, thinner and lighter. Its panel size has experienced a generational change from 5G to 11G, and its thickness has decreased from 0.7mm to 0.4mm, and even towards 0.2mm. Flexible glass with a thickness ≤ 0.1mm has emerged under this background. With the advent of the "Internet +" era, people's lives are becoming more and more closely related to handheld electronic devices, and the application of flexible glass has become more and more extensive. When people touch the screen, sweat and oil on the body will adhere to the screen, which provides favorable conditions for the reproduction of bacteria and viruses, affecting people's health and even endangering lives. Therefore, flexible antibacterial glass with bactericidal and antibacterial effects has attracted more and more attention.

[0004] Currently, the mainstream flexible antibacterial glass products on the market are silver-loaded flexible glass. However, due to the very active chemical properties of silver, it is easy to undergo oxidation-reduction in the glass to form silver atoms, and the silver atoms will agglomerate with silver ions to form silver particle clusters (such as Ag 2+ -Ag 0 +Ag + 、Ag 2+ -Ag + +Ag + etc.). When the size of the silver particle clusters increases, the flexible glass will turn yellow in color, and the transmittance of the silver-loaded flexible glass will also decrease accordingly, thereby reducing the antibacterial performance of the flexible antibacterial glass. The conventional solution is to add Na2S, A12O3, etc. to form stable structures with silver ions, such as Ag[AlO4], [Ag(S203)2] 3- , so that silver ions can exist stably. However, the stability of this complex structure is weak, resulting in a poor effect of inhibiting the reduction of silver ions. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies existing in the above technologies and provide a flexible antibacterial glass that can effectively inhibit the reduction of silver ions.

[0006] In order to achieve the above purpose, the technical solution provided by the present invention is:

[0007] A flexible antibacterial glass that effectively inhibits the reduction of silver ions, characterized in that the glass contains the following components in mass percentages: SiO2: 55 - 65%, Al2O3: 16 - 25%, Na2O: 5 - 12%, K2O: 0.5 - 4%, MgO: 2 - 8%, CaO: 0 - 1%, ZrO2: 0 - 2%, Ag2O: 0.5 - 2%, CoO: 0.41 - 3.55%, Na2S: 0 - 0.5%.

[0008] In the above technical solution, preferably, the raw material of Na2O in the glass composition is Na2CO3, the raw material of K2O is K2CO3, the raw material of CaO is CaCO3, the raw material of Ag2O is: AgNO3, and the raw material of CoO is Co(NO3)2·6H2O.

[0009] In the above technical solution, preferably, it is characterized in that: the particle size of SiO2 is 50 - 300 μm, the particle sizes of Al2O3, MgO and ZrO are 20 - 100 μm, the particle sizes of Na2CO3, K2CO3, CaCO3 are 20 - 200 μm, and the particle sizes of AgNO3 and Co(NO3)2·6H2O are 40 - 60 μm.

[0010] In the above technical solution, preferably, the melting temperature of the glass formulation is: 1550°C - 1700°C.

[0011] In the above technical solution, preferably, the transmittance in the visible light band of 380 nm - 780 nm (thickness 30 μm - 70 μm) ≥ 91%.

[0012] In the above technical solution, preferably, it is characterized in that: the antibacterial activity level is antibacterial grade II, R ≥ 3.

[0013] The advantages of the present invention are: by adding a small amount (0.41 - 1.55%) of cobalt nitrate hexahydrate (Co(NO3)2·6H2O) to the flexible glass formulation, a silver - cobalt alloy is formed by cobalt nitrate hexahydrate and silver oxide during the glass melting process. The silver - cobalt alloy has excellent chemical stability, making it difficult for silver ions to be reduced to silver metal. Cobalt in the formulation can be used in combination with alumina and Na2S, etc., which not only reduces the addition amount of cobalt but also improves the effect of inhibiting the reduction of silver ions. Specific embodiments

[0014] The technical solutions of the present invention will be further described below through specific examples, but these examples are only used to illustrate the present invention and not to limit the scope of the present invention.

[0015] Example 1:

[0016] A flexible antibacterial glass that effectively inhibits the reduction of silver ions, which is composed of the following components by mass percentage: SiO2: 55 - 65%, Al2O3: 16 - 25%, Na2O: 5 - 12%, K2O: 0.5 - 4%, MgO: 2 - 8%, CaO: 0 - 1%, ZrO2: 0 - 2%, Ag2O: 0.5 - 2%, CoO: 0.41 - 3.55%, Na2S: 0 - 0.5%.

[0017] When preparing the above flexible antibacterial glass, the raw material of Na2O is Na2CO3, the raw material of K2O is K2CO3, the raw material of CaO is CaCO3, the raw material of Ag2O is: AgNO3, and the raw material of CoO is Co(NO3)2·6H2O. Calculate the batch composition according to the components of the above flexible antibacterial glass by mass percentage, and the raw materials are composed according to the following ratio: SiO2: 55 - 65%, Al2O3: 16 - 25%, Na2CO3: 8.5 - 20.5%, K2CO3: 0.7 - 5.9%, MgO: 2 - 8%, CaO: 0 - 1.8%, ZrO2: 0 - 2%, AgNO3: 0.7 - 2.9%, Co(NO3)2·6H2O: 1.59 - 13.70%, Na2S: 0 - 0.5%.

[0018] The particle size of the described SiO2 is 50 - 300μm, the particle sizes of Al2O3, MgO and ZrO are 20 - 100μm, the particle sizes of Na2CO3, K2CO3, CaCO3 are 20 - 200μm, and the particle sizes of AgNO3 and Co(NO3)2·6H2O are 40 - 60μm.

[0019] According to the melting process in the prior art, the batch is melted to a temperature of 1550°C - 1700°C; then the flexible antibacterial glass made by the conventional forming preparation process has a transmittance (thickness 30μm - 70μm) ≥ 91% in the visible light band of 380nm - 780nm.

[0020] The antibacterial activity level of the made flexible antibacterial glass is antibacterial grade II with R ≥ 3.

[0021] Examples 1 - 6

[0022]

[0023] It can be seen from Example 6 the effect of not adding CoO. The effect of inhibiting the reduction of silver ions can be seen from the visible light transmittance, because the glass turns color after the reduction of silver ions, and the visible light transmittance decreases significantly. The visible light transmittance of Example 6 is only 89.3%.

Claims

1. A flexible antibacterial glass that effectively inhibits the reduction of silver ions, characterized in that It is composed of the following components by mass percentage: SiO2: 55 - 65%, Al2O3: 16 - 25%, Na2O: 5 - 12%, K2O: 0.5 - 4%, MgO: 2 - 8%, CaO: 0 - 1%, ZrO2: 0 - 2%, Ag2O: 0.5 - 2%, CoO: 0.41 - 3.55%, Na2S: 0 - 0.5%; In the glass composition, the raw material of Na2O is Na2CO3, the raw material of K2O is K2CO3, the raw material of CaO is CaCO3, the raw material of Ag2O is: AgNO3, and the raw material of CoO is Co(NO3)2·6H2O; The particle size of the SiO2 is 50 - 300 μm, the particle sizes of Al2O3, MgO and ZrO2 are 20 - 100 μm, the particle sizes of Na2CO3, K2CO3 and CaCO3 are 20 - 200 μm, and the particle sizes of AgNO3 and Co(NO3)2·6H2O are 40 - 60 μm; The thickness of the flexible antibacterial glass is 30 μm - 70 μm, and the transmittance in the visible light band of 380 nm - 780 nm is ≥ 91%.

2. The flexible antibacterial glass for effectively inhibiting silver ion reduction according to claim 1, wherein: The melting temperature of the glass formula: 1550 °C - 1700 °C.

3. The flexible antibacterial glass for effectively inhibiting silver ion reduction according to claim 1, wherein: The antibacterial activity level is antibacterial grade II with R ≥ 3.

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