Flexible antibacterial glass that effectively suppresses the reduction of silver ions

Abstract

The flexible antibacterial glass that effectively suppresses the reduction of silver ions contains components with mass percentages of SiO2 being 55 - 65%, Al2O3 being 16 - 25%, Na2O being 5 - 12%, K2O being 0.5 - 4%, MgO being 2 - 8%, CaO being 0 - 1%, ZrO2 being 0 - 2%, Ag2O being 0.1 - 1%, CoO being 0.2 - 3.55%, and Na2S being 0 - 0.5%. The raw materials of the above components are combined to form a batch material, and melt forming is carried out. As an advantage, the flexible antibacterial glass can well suppress the reduction of silver ions to silver monomers and effectively control the yellowing of the glass. The flexible glass has antibacterial performance. Compared with the case of imparting antibacterial effect to the flexible glass by the ion exchange method, the flexible glass is thinner and does not damage the strength and toughness of the flexible glass. Also, the antibacterial activity level is such that the antibacterial R of level II is ≧3, and the visible light transmittance of 380 - 780 nm is ≧91%.

Description

Technical Field

[0001] The present invention relates to flexible antibacterial glass, and particularly to flexible antibacterial glass that effectively suppresses the reduction of silver ions.

Background Art

[0002] Bacteria and molds, as pathogenic bacteria, cause great harm to humans, animals and plants. Therefore, products with bactericidal and antibacterial effects are attracting more and more attention from people.

[0003] As an important base material for display products, electronic glass has been following the trends of enlargement, light weight and thinning with the rapid development of the display industry. The size of electronic glass has experienced the generation change from 5G to 11G, and the thickness has evolved from 0.7 mm to 0.4 mm, and further to 0.2 mm. Against this background, flexible glass with a thickness of ≤0.1 mm has emerged. With the advent of the "Internet Plus" era, the relationship between people's lives and portable electronic devices has become increasingly close, and the application of flexible glass has also become increasingly widespread. When people touch the panel, sweat and sebum on the body adhere to the panel. This provides favorable conditions for the reproduction of bacteria and viruses, affecting people's health and even threatening lives. Therefore, flexible antibacterial glass with bactericidal and antibacterial effects is attracting more and more attention from people.

[0004] Currently, the mainstream flexible antibacterial glass products in the market are silver-supported flexible glass. However, the chemical properties of silver are very active, and oxidation-reduction occurs in the glass to easily form silver atoms. Silver atoms aggregate with silver ions to form silver particle clusters (for example, Ag 2+ -Ag 0 +Ag + 、Ag 2+ -Ag + +Ag +It generates (such as). When the size of the silver particle clusters increases, the flexible glass becomes colored and yellowed, and accordingly, the transmittance of the silver-supported flexible glass also decreases. Moreover, this causes a decrease in the antibacterial performance of the flexible antibacterial glass. As a general solution, by adding Na2S, Al2O3, etc. to form a stabilizing structure such as Ag[AlO4], [Ag(S2O3)2] between silver ions and them, silver ions can exist stably. However, the stability of such a complex structure is fragile and inferior in the effect of suppressing the reduction of silver ions. 3- This enables silver ions to exist stably by forming a stabilizing structure such as this. However, the stability of such a complex structure is fragile and inferior in the effect of suppressing the reduction of silver ions.

Summary of the Invention

Problems to be Solved by the Invention

[0005] An object of the present invention is to provide a flexible antibacterial glass that effectively suppresses the reduction of silver ions in order to solve the defects existing in the above technology.

Means for Solving the Problems

[0006] In order to achieve the above object, the technical means provided by the present invention are as follows.

[0007] A flexible antibacterial glass that effectively suppresses the reduction of silver ions is characterized by containing components in mass percentages of 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 means, preferably, among the glass components, 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.

[0009] In the above technical means, preferably, the particle size of the above-mentioned SiO2 is 50 to 300 μm, the particle size of Al2O3, MgO and ZrO2 is 20 to 100 μm, the particle size of Na2CO3, K2CO3, CaCO3 is 20 to 200 μm, and the particle size of AgNO3 and Co(NO3)2·6H2O is 40 to 60 μm.

[0010] In the above technical means, preferably, the melting temperature of the glass component is 1550 to 1700 °C.

[0011] In the above technical means, preferably, the transmittance (thickness 30 to 70 μm) in the visible light wavelength band of 380 to 780 nm is ≧ 91%.

[0012] In the above technical means, preferably, the antibacterial activity level is characterized in that the antibacterial R of level II is ≧ 3.

Advantages of the Invention

[0013] The advantages of the present invention are as follows. By adding a small amount (0.41 to 1.55%) of cobalt nitrate hexahydrate (Co(NO3)2·6H2O) to the components of the flexible glass, silver-cobalt alloy is formed by cobalt nitrate hexahydrate and silver oxide during the melting process of the glass. Since the silver-cobalt alloy has excellent chemical stability, it is difficult for silver ions to be reduced to silver metal. In addition, cobalt in the components can be used in combination with aluminum oxide and Na2S, etc., so that the addition amount of cobalt is reduced and the effect of suppressing the reduction of silver ions can be improved.

Embodiments for Carrying out the Invention

[0014] Hereinafter, the technical means of the present invention will be further described by specific examples. However, these examples are only for explaining the present invention and do not limit the scope of the present invention.

[0015] Example 1: The flexible antibacterial glass that effectively suppresses the reduction of silver ions is composed of components with the following 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%.

[0016] 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. Calculated according to the components of the mass percentages in the above-mentioned flexible antibacterial glass, the batch materials are composed. Each raw material is combined in the following mixing ratios: 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%.

[0017] The particle size of the above-mentioned SiO2 is 50 - 300 μm, the particle sizes of Al2O3, MgO and ZrO2 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.

[0018] According to the melting process in the prior art, the melting temperature of the batch materials is 1550 - 1700 °C. Then, the flexible antibacterial glass manufactured according to the general forming and manufacturing process has a transmittance (thickness 30 - 70 μm) in the visible light wavelength band of 380 - 780 nm of ≥ 91%.

[0019] The antibacterial activity level of the manufactured flexible antibacterial glass is such that the antibacterial R of level II is ≥ 3.

[0020]

Table 1

[0021] From Example 6, the effect of not adding CoO is clear. Also, the effect of suppressing the reduction of silver ions is clear from the visible light transmittance. This is because after the reduction of silver ions, the glass becomes colored and the transmittance of visible light significantly decreases. The visible light transmittance of Example 6 was only 89.3%.

Claims

1. SiO ２ : 55 - 65%, Al ２ O ３ : 16 - 25%, Na ２ O: 5 - 12%, K ２ O: 0.5 - 4%, MgO: 2 - 8%, CaO: 0 - 1%, ZrO ２ : 0 - 2%, Ag ２ O: 0.5 - 2%, CoO: 0.41 - 3.55%, Na ２ S: 0 - 0.5% by mass percentage, and is characterized by being composed of components with such mass percentages, a flexible antibacterial glass that effectively suppresses the reduction of silver ions.

2. Among the components of the glass, Na ２ The raw material of O is Na ２ CO ３ And the raw material of K ２ O is K ２ CO ３ The raw material of CaO is CaCO ３ The raw material of Ag ２ O is AgNO ３ The raw material of CoO is Co(NO ３ ) ２ ·6H ２ O, and it is the flexible antibacterial glass that effectively suppresses the reduction of silver ions according to claim 1.

3. The particle diameter of the SiO ２ is 50 to 300 μm, and the particle diameters of Al ２ O ３ , MgO and ZrO ２ are 20 to 100 μm, the particle diameters of Na ２ CO ３ , K ２ CO ３ , CaCO ３ are 20 to 200 μm, and the particle diameters of AgNO ３ and Co(NO ３ ) ２ ·6H ２ O are 40 to 60 μm, and the flexible antibacterial glass according to claim 1, which effectively suppresses the reduction of silver ions, is characterized in that.

4. The flexible antibacterial glass that effectively suppresses the reduction of silver ions according to Claim 1, wherein the melting temperature of the components of the glass is 1550 to 1700 °C.

5. The flexible antibacterial glass that effectively suppresses the reduction of silver ions according to Claim 4, wherein the flexible antibacterial glass has a thickness of 30 to 70 μm and a transmittance of ≧91% in the visible light wavelength band of 380 to 780 nm.

6. The flexible antibacterial glass that effectively suppresses the reduction of silver ions according to Claim 1, wherein the antibacterial activity level is such that the antibacterial R of Level II is ≧3.

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