Method for producing article containing glass

Abstract

To provide glass having high water repellency.SOLUTION: In a glass composition based on oxides, on a mass basis, the SiO2 content is 1 to 8%, the B2O3 content is 8 to 25%, the ZnO content is 3 to 35%, the La2O3 content is 15 to 45%, the ZrO2 content is 1 to 8%, the total content of SiO2, B2O3 and P2O5 (SiO2+B2O3+P2O5) is 15 to 30%, the total content of ZnO, MgO, CaO, SrO, BaO, Y2O3, La2O3, Gd2O3, ZrO2, TiO2, Al2O3, Nb2O5, Ta2O5, WO3 and Bi2O3 (ZnO+MgO+CaO+SrO+BaO+Y2O3+La2O3+Gd2O3+ZrO2+TiO2+Al2O3+Nb2O5+Ta2O5+WO3+Bi2O3) is 65 to 85%, and the glass has a water contact angle of 60° or more.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to glass and articles comprising glass. [Background technology]

[0002] Glass is used in a variety of articles to take advantage of its physical properties (e.g., transparency, chemical, mechanical, and thermal stability). Meanwhile, articles with high water repellency are desired in various fields, but glass is generally known to be a substance that easily gets wet and has low water repellency. Therefore, for articles requiring water repellency, water repellency has been imparted by forming a water-repellent coating on the glass surface or by processing the glass surface into a micro-irregular shape (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-001327 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, for a car windshield, increasing the water repellency of the windshield surface so that water droplets can be easily removed is important for ensuring the driver's visibility. For example, for tableware, high water repellency is desirable from the perspective of preventing the buildup of limescale. Also, for measuring cylinders, the meniscus formed by the high wettability of glass makes it difficult to accurately measure water.

[0005] However, when imparting water repellency using the conventional methods described above (such as forming a water-repellent coating or micro-texturing), it is difficult to fully utilize the physical properties of glass. Furthermore, when imparting water repellency by forming a water-repellent coating, for example, it is not easy to form a coating film that has long-lasting water repellency and excellent uniformity. In contrast, if the water repellency of the glass itself could be enhanced, the excellent physical properties of glass could be utilized to improve the performance of various water-repellent articles. However, until now, no method has been shown to enhance the water repellency of glass itself, and glass with high water repellency has not been put to practical use.

[0006] An object of one aspect of the present invention is to provide glass having high water repellency. [Means for solving the problem]

[0007] One aspect of the present invention is In the oxide-based glass composition, By mass, SiO2 content 0-25%, B2O3 content 0~35%, P2O5 content 0~30%, The total content of SiO2, B2O3 and P2O5 (SiO2+B2O3+P2O5) is 10-45%, Al2O3 content 0~15%, Li2O content is 0-2% Na2O content 0-10% K2O content 0-10% Rb2O content is 0-5% Cs2O content 0-5% The total content of Li2O, Na2O, K2O, Rb2O and Cs2O (Li2O + Na2O + K2O + Rb2O + Cs2O) is 0 to 15%; MgO content 0-20% CaO content 0-25% SrO content 0-25% BaO content is 0-30% ZnO content 0-60%, La2O3 content 0~50%, Y2O3 content 0~15%, Gd2O3 content 0~25%, Yb2O3 content 0~10% CeO2 content 0-10% ZrO2 content 0~15%, TiO2 content 0-20%, SnO2 content 0~10% Nb2O5 content 0~30%, Ta2O5 content 0~15% WO3 content 0-15% Bi2O3 content 0~20%, Ga2O3 content is 0-5%; In2O3 content is 0~5%; GeO2 content 0-5% Sb2O3 content is 0-1% The total content of ZnO, MgO, CaO, SrO, BaO, Y2O3, La2O3, Gd2O3, ZrO2, TiO2, Al2O3, Nb2O5, Ta2O5, WO3 and Bi2O3 (ZnO+MgO+CaO+SrO+BaO+Y2O3+La2O3+Gd2O3+ZrO2+TiO2+Al2O3+Nb2O5+Ta2O5+WO3+Bi2O3) is 55-90%, Fe2O3 content 0-10% The total content of V2O5, Cr2O3, MnO2, Co2O3, NiO, CuO, MoO, Au2O3 and Ag2O (V2O5+Cr2O3+MnO2+Co2O3+NiO+CuO+MoO+Au2O3+Ag2O) is 0-3%; and Glass with a wetting angle to water of 60° or more (excluding glasses used in optical elements selected from the group consisting of lenses and prisms, and glasses used in optical fibers), Regarding.

[0008] Another aspect of the present invention relates to an article comprising glass, the article being selected from the group consisting of window materials, windshields, cover glass, mirrors, tableware, laboratory equipment, cooking utensils, washstands, toilet bowls, gravestones, jewelry, art objects, glass fibers, and glass fiber molded articles, wherein the glass has the above glass composition and has a wetting angle with water of 60° or greater. [Effects of the Invention]

[0009] According to one aspect of the present invention, it is possible to provide glass having high water repellency and an article including glass having high water repellency. [Brief explanation of the drawings]

[0010] [Figure 1] 1 shows the spectral transmittance curve obtained for the glass of Example 40. [Figure 2] 1 shows the spectral transmittance curve obtained for the glass of Example 41. [Figure 3] 1 shows the spectral transmittance curve obtained for the glass of Example 42. [Figure 4] 1 shows the spectral transmittance curve obtained for the glass of Example 43. [Figure 5] 1 shows the spectral transmittance curve obtained for the glass of Example 44. [Figure 6] 1 shows the spectral transmittance curve obtained for the glass of Example 45. [Figure 7] 1 shows the spectral transmittance curve obtained for the glass of Example 46. [Figure 8] 1 shows the spectral transmittance curve obtained for the glass of Example 47. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Glass] The above glass will be described in more detail below.

[0012] Regarding the water repellency of glass, for example, soda-lime glass, which is widely used for window glass, bottle glass, etc., is said to have a wetting angle of less than 40°. Soda-lime glass contains approximately 70% SiO2 by mass. Furthermore, hard glass, such as that used for tableware and chemical laboratory equipment, has an SiO2 content of over 70% by mass. Thus, in glass used for items where water repellency is desired, SiO2 generally serves as the network former. Therefore, even slight changes in the modifying oxides only result in a minimal change in surface energy, leading to the commonly accepted concept of "glass = hydrophilic." Hydrophilicity and water repellency are determined by the surface free energy of a material. Water repellency occurs when the surface tension of water is not inhibited. However, the relatively high surface energy of SiO2, a glass-forming oxide, increases water wettability. On the other hand, it is possible to incorporate various components into glass. For example, various compositions of glass have been used in the past as optical glass, which requires unique refractive index characteristics for lenses and prisms. For example, glass containing B2O3 and P2O5 in addition to SiO2 has been used as a network former. Optical glass is often coated with an anti-reflection coating to reduce surface reflection. Lenses with different properties are also commonly cemented together. In this case, no special adjustments to the surface properties of the glass itself are required. For this reason, water repellency has not been a requirement for optical glass, and has not been considered. In response to this, the present inventors, through extensive research, have discovered a new finding that adjusting the glass composition can significantly change the wettability of glass. Specifically, it has been found that the wettability of glass can be adjusted by adjusting the content of components that significantly affect wettability. Even more specifically, it has been found that the wettability of glass can be adjusted by incorporating large amounts of components that reduce surface energy, or components that are less reactive with water and have low solubility, and conversely, by reducing the content of components that have high surface energy, high polarity, or high chemical reactivity with water. Based on the composition adjustment method thus discovered for increasing the water repellency of glass, the present inventors have further intensively researched and, as a result, have obtained a glass that is highly water repellent and suitable for practical use, i.e., the above-mentioned glass. The above glass will be described in more detail below.

[0013] <Glass composition> In the present invention and this specification, the glass composition is expressed on an oxide basis for the cationic components of the glass. Here, "glass composition on an oxide basis" refers to the glass composition obtained by converting the glass raw materials into oxides that are present in the glass after they are all decomposed during melting. Unless otherwise specified, the glass composition is expressed on a mass basis (mass %, mass ratio). The content (mass % of element) of each element contained in the glass can be determined by known methods such as inductively coupled plasma atomic emission spectroscopy (ICP-AES), inductively coupled plasma mass spectroscopy (ICP-MS), etc. The content of each element expressed in mol % can be determined by dividing the element content (mass % of element) by its atomic weight, and this value can be used to calculate the content (unit: mass %) in the glass composition converted into oxide. Anionic components contained in glass can be identified and quantified by known analytical methods, such as ion chromatography and non-dispersive infrared absorption (ND-IR). For anionic components other than oxygen, the anionic content (anion %) can be determined by known methods. "Anionic %" is a value calculated by the formula "(number of anions of interest / total number of anions in glass components) × 100," meaning the molar percentage of the amount of the anion of interest relative to the total amount of anions. In the present invention and this specification, when no anionic components other than oxygen are detected by known analysis methods, all of the anionic components (i.e., 100 anionic %) are considered to be oxygen ions. In contrast, when one or more other anionic components are detected in addition to oxygen by known analysis methods, the oxygen content is calculated as the content (unit: anionic %) using the following method, based on the valence and cation % content of the cationic components contained in the glass and the valence and anion % content of the anionic components other than oxygen. That is, the sum of "valence x content" (hereinafter referred to as "total cation valence") for the cationic components contained in the glass is calculated based on the results of identification and quantitative analysis using known methods. The sum of "valence x content" (hereinafter referred to as "total anion valence excluding oxygen") for the anionic components excluding oxygen is also calculated based on the results of identification and quantitative analysis using known methods. From the calculated value, the value calculated as "[(total cation valence) - (total anion valence excluding oxygen)] / 2" can be used as the oxygen content (more specifically, the percentage of oxygen ions in the anionic components (unit: anion %)). "Cation %" is calculated as "(number of cations of interest / total number of cations in the glass components) x 100" and means the molar percentage of the amount of the cation of interest relative to the total amount of cations. The formal valence of each cation is used to determine the valence of the oxide of the cationic component of interest. The formal valence is the valence required for the oxide to maintain electrical neutrality when the valence of the oxygen ions (anions) constituting the oxide is set to -2, and can be uniquely determined from the chemical formula of the oxide.In addition, the valence of an anion (for example, the valence of an oxygen ion is -2, the valence of a fluorine ion is -1, and the valence of a chlorine ion is -1) is a formal valence based on the idea that each ion accepts electrons to form a closed shell structure (for example, an oxygen ion accepts two electrons to form a closed shell structure, and a fluorine ion and a chlorine ion accept one electron to form a closed shell structure). Alternatively, the content of anionic components can be defined as the content (unit: mass%) of each element in terms of the total content of the glass composition based on the oxides of cationic components determined as described above, expressed as an external ratio relative to 100 mass%. Furthermore, in the present invention and this specification, a content of 0% or not containing or not incorporating a component means that the component is substantially not contained, and it is acceptable for the component to be contained at an unavoidable impurity level.

[0014] Generally, SiO2-Na2O-CaO type glasses are used for window glass and container glass. These glasses have a wetting angle with water of about 30° and are generally recognized as hydrophilic substances. For glasses containing 60% or more of SiO2, adjusting the other components does not significantly affect the wetting angle, so it is thought that no attempt has been made to improve the water repellency of the glass itself. On the other hand, for lenses, prisms and optical fibers, glass using network formers other than SiO2 has traditionally been used, and by containing various components, it has been possible to create characteristics in the refractive index and refractive index dispersion (changes in the refractive index depending on the wavelength of light), and this has led to its use in lenses, prisms, optical fibers and the like. Optical glass is often coated with an anti-reflection coating after grinding and polishing, and water repellency is not required because it rarely comes into contact with water during use. Therefore, the relationship between water repellency and glass composition has not been studied. For similar reasons, the relationship between water repellency and glass composition has not been studied for optical fibers either. The inventors have found that the wetting angle of glass to water varies depending on the composition of the glass, and have further investigated the effects of differences in composition. As a result, they have found that, for example, B2O3-La2O3-based glasses tend to have high water repellency, while alkali components and SiO2 components tend to weaken water repellency. The inventors have also found that it is possible to obtain glass that has good chemical durability against water. In other words, they have found that it is possible to obtain glass that is useful in a variety of applications, capable of achieving both water repellency and practical chemical durability, assuming contact with water.

[0015] In the above glass, the main component of the network former may be any of SiO2, B2O3, and P2O5. B2O3 is particularly effective because it can contain a large amount of La2O3, which will be described later. From the viewpoint of suppressing a decrease in chemical durability, the B2O3 content is 35% or less, and preferably 25% or less. Furthermore, the B2O3 content is 0% or more, and preferably 8% or more. From the standpoint of improving the alkali resistance of the glass, the B2O3 content may be 32% or less, 27% or less, 22% or less, 18% or less, or 15% or less.

[0016] SiO2 is effective as a glass network former. From the viewpoint of suppressing a decrease in water repellency, the SiO2 content is 25% or less, preferably 8% or less. The SiO2 content is 0% or more, preferably 1% or more. From the viewpoint of improving the alkali resistance and / or chemical durability of the glass, the SiO2 content may be 2% or more, 4% or more, 10% or more, 15% or more, or 20% or more.

[0017] P2O5 is a useful component from the viewpoint of allowing the incorporation of large amounts of components such as BaO, CaO, and Nb2O5, which will be described later. The P2O5 content is 0% or more, and from the viewpoint of improving chemical durability, it is 30% or less. From the viewpoint of improving the alkali resistance of the glass, the content of P2O5 is preferably 5% or less, and more preferably 3% or less.

[0018] The total content of SiO2, B2O3 and P2O5 (SiO2+B2O3+P2O5) is in the range of 10 to 45%, preferably in the range of 10 to 40%, and more preferably in the range of 15 to 30%, from the viewpoint of suppressing a decrease in water repellency.

[0019] The GeO2 content is 0% or more. GeO2 has the function of stabilizing the glass as a network former, but since it is a rare component, its content is 5% or less, preferably 2% or less, and more preferably less than 1%.

[0020] The Al2O3 content is 0% or more. Al2O3 is a component that can strengthen the structure of glass, so it is effective in improving chemical durability and mechanical strength. From the perspective of suppressing the tendency toward crystallization for stable production, the Al2O3 content is 15% or less. From the viewpoint of improving the alkali resistance of the glass, the content of Al2O3 may be more than 0%, 1% or more, or 3% or more.

[0021] The contents of Li2O, Na2O, K2O, Rb2O, and Cs2O are each 0% or more. These are components that lower the melting temperature of the glass and promote vitrification. From the viewpoint of preventing a decrease in water repellency, chemical durability, and mechanical strength, the Li2O content is 2% or less, the Na2O content is 10% or less, the K2O content is 10% or less, the Rb2O content is 5% or less, and the Cs2O content is 5% or less.

[0022] The total content of Li2O, Na2O, K2O, Rb2O and Cs2O (Li2O + Na2O + K2O + Rb2O + Cs2O) is in the range of 0 to 20% from the viewpoint of suppressing a decrease in water repellency, chemical durability and mechanical strength, and is preferably 16% or less, more preferably 9% or less, and even more preferably 6% or less. From the viewpoint of improving the chemical durability of the glass, the total content of Li2O, Na2O, K2O, Rb2O and Cs2O (Li2O + Na2O + K2O + Rb2O + Cs2O) may be 3% or less, 2% or less, 1% or less, or 0.3% or less.

[0023] The ZnO content is 0% or more, preferably 3% or more, and more preferably 5% or more. ZnO is a component that enhances water repellency and is a component that can achieve stable vitrification even when the content is large. From the viewpoint of suppressing deterioration in mechanical properties and heat resistance (for example, suppressing deterioration in glass transition temperature), the ZnO content is 60% or less, preferably 55% or less, and more preferably 35% or less. In one aspect, the ZnO content may be 10% or more, 15% or more, 20% or more, 25% or more, 30%, 35% or more, 40% or more, or 45% or more. In one embodiment, the ZnO content may be 40% or less, 32% or less, 24% or less, 16% or less, 8% or less, or 4% or less.

[0024] The contents of MgO, CaO, SrO, and BaO are each 0% or more. These are effective components for stable vitrification of any network former. From the viewpoint of preventing a decrease in water repellency, the MgO content is 20% or less, the CaO content is 25% or less, the SrO content is 25% or less, and the BaO content is 30% or less.

[0025] The La2O3 content is 0% or more, and preferably 15% or more. La2O3 is a component that has a significant effect of enhancing water repellency. From the viewpoint of suppressing the tendency toward crystallization, the La2O3 content is 50% or less, and preferably 45% or less. From the standpoint of improving the alkali resistance of the glass, the La2O3 content may be 10% or more, 15% or more, 20% or more, 25% or more, 33% or more, or 40% or more.

[0026] The contents of Y2O3 and Gd2O3 are each 0% or more. Y2O3 and Gd2O3 are components that can bring about the same effects as La2O3. From the viewpoint of suppressing the tendency to crystallize, the Y2O3 content is 15% or less and the Gd2O3 content is 25% or less. From the viewpoint of improving the alkali resistance of the glass, the Y2O3 content may be 1% or more, 3% or more, or 4% or more. From the viewpoint of improving the alkali resistance of the glass, the Gd2O3 content may be 1% or more, 3% or more, or 4% or more.

[0027] The Yb2O3 content is 0% or more. The Yb2O3 content can bring about the same effects as La2O3, Y2O3, and Gd2O3, but since it is a rare component, the content is 10% or less, and preferably 5% or less.

[0028] The CeO2 content is 0% or more. Adding a small amount of CeO2 can provide an ultraviolet ray blocking effect. Adding a small amount of CeO2 can also adjust the color of the glass. From the viewpoint of suppressing a decrease in devitrification resistance, the CeO2 content is 5% or less.

[0029] The content of Ga2O3 and In2O3 is 0% or more. Ga2O3 and In2O3 can provide the same effects as La2O3, Y2O3, and Gd2O3, but because they are rare elements, the content is 5% or less.

[0030] The ZrO2 content is 0% or more, and preferably 1% or more. ZrO2 is a component that can significantly improve chemical durability and mechanical strength (e.g., hardness) without significantly reducing water repellency. From the viewpoint of suppressing an increase in the tendency for crystallization due to an increase in melting temperature, the ZrO2 content is 15% or less, and preferably 8% or less. The ZrO2 content may be 2% or more, 4% or more, 5% or more, 6% or more, or 7% or more, because ZrO2 is a component that is particularly useful for improving the chemical durability and / or alkali resistance of glass.

[0031] The TiO2 content is 0% or more. TiO2 is a component that can be contained in large amounts and can improve chemical durability and mechanical strength. From the perspective of suppressing a decrease in transmittance, the TiO2 content is 20% or less. The TiO2 content may be 2% or more, 4% or more, 6% or more, 8% or more, 10% or more, 12% or more, 16% or more, or 20% or more, because TiO2 is a useful component for improving the chemical durability and / or alkali resistance of glass.

[0032] The SnO2 content is 0% or more. SnO2 is a component that can bring about a clarifying effect when added in small amounts. It can also have the effect of increasing water repellency. From the viewpoint of preventing a decrease in meltability, the SnO2 content is 10% or less.

[0033] The Nb2O5 content is 0% or more, and may be 1% or more, 3% or more, 6% or more, 10% or more, or 14% or more. A large amount of Nb2O5 can be incorporated into a glass having a P2O5 network, which can provide a water-repellent effect. From the viewpoints of suppressing the tendency toward crystallization, suppressing a decrease in transmittance, and reducing costs, the Nb2O5 content is 30% or less, and may be 20% or less, 15% or less, or 10% or less.

[0034] The Ta2O5 content is 0% or more. A small amount of Ta2O5 can have the effect of increasing the stability of the glass. The Ta2O5 content may be more than 0%, 1% or more, 3% or more, 6% or more, or 12% or more. From the viewpoint of suppressing the tendency to crystallize, the Ta2O5 content may be 15% or less, 10% or less, 5% or less, or 0%.

[0035] The WO3 content is 0% or more. A small amount of WO3 can improve chemical durability. The WO3 content may be greater than 0%, 1% or more, 2% or more, or 4% or more. From the viewpoint of suppressing an increase in melting temperature and suppressing crystallization tendency, the WO3 content may be 15% or less, 10% or less, 5% or less, or 0%.

[0036] The Bi2O3 content is 0% or more. Bi2O3 is a component that can improve meltability without reducing water repellency. From the viewpoint of suppressing a decrease in mechanical strength and a decrease in crystallization tendency, the Bi2O3 content is 20% or less, and may be 14% or less, 9% or less, or 4% or less.

[0037] The total content of ZnO, MgO, CaO, SrO, BaO, Y2O3, La2O3, Gd2O3, ZrO2, TiO2, Al2O3, Nb2O5, Ta2O5, WO3, and Bi2O3 (ZnO + MgO + CaO + SrO + BaO + Y2O3 + La2O3 + Gd2O3 + ZrO2 + TiO2 + Al2O3 + Nb2O5 + Ta2O5 + WO3 + Bi2O3) is 55% or more, preferably 60% or more, and more preferably 65% ​​or more, from the viewpoint of improving water repellency. From the viewpoint of preventing a decrease in glass stability, the total content is 90% or less, and preferably 85% or less.

[0038] The Fe2O3 content ranges from 0 to 10%, and the total content of V2O5, Cr2O3, MnO2, Co2O3, NiO, CuO, MoO, Au2O3, and Ag2O (V2O5 + Cr2O3 + MnO2 + Co2O3 + NiO + CuO + MoO + Au2O3 + Ag2O) ranges from 0 to 3%. The color of glass can be adjusted by adding one or more of the coloring components Fe, V, Cr, Mn, Co, Ni, Cu, Mo, Au, and Ag. These components are typically added as oxides or chlorides to the glass raw materials during glass production, and various colors can be obtained by adjusting the melting temperature, atmosphere, or heat treatment. Other components that can be added to adjust the color of glass include coloring components such as Nd2O3, as well as Eu2O3, Er2O3, and Sm2O3.

[0039] The Sb2O3 content is 0% or more. Sb2O3, which promotes fining during melting, can be added up to 1%.

[0040] The above-mentioned glasses can be obtained by blending, melting, and molding various glass raw materials. Examples of glass raw materials that can be used include oxides, hydrates, phosphates, carbonates, nitrates, sulfates, and fluorides. Specific examples of glass raw materials include oxides such as SiO2, ZnO, La2O3, and ZrO2, hydrates such as H3BO3, nitrates such as Sr(NO3)2, and carbonates such as BaCO3. Fluorine-containing glasses can also be obtained by adding fluorides such as ZnF2, MgF2, and AlF3 as glass raw materials during glass production. The type and amount of anion components introduced into the glass can be adjusted by changing the type and amount of the glass raw materials added. Examples of anion components include oxygen (O 2- ), fluorine (F - ), chlorine (Cl - In the above glass, the anion component is oxygen (O 2- ) may be 100% anion, or may contain one or more other anion components in addition to oxygen. For example, fluorine (F -The introduction of fluorine (F) can contribute to improving water repellency. - The content of fluorine is preferably 10 mass % or less in terms of the content in terms of the above-mentioned external percentage. - ) can be introduced into the glass, for example, by using chlorides such as AuCl3, AgCl, etc. as glass raw materials.

[0041] The above-mentioned glass can be amorphous glass in one form, or crystal-containing glass (crystallized glass) in another form. The above-mentioned glass can be used as a molded body formed into various shapes, such as a plate, by any molding method, as a coating (glass layer), or as glass powder. It can also be used as a sintered body of glass powder, as glass fiber, or as a molded glass fiber. However, the above-mentioned glass does not include glass used in optical elements selected from the group consisting of lenses and prisms, or glass used in optical fibers.

[0042] <Glass properties> (Water wetting angle) The water wetting angle of the glass is 60° or more, preferably 65° or more, more preferably 70° or more, even more preferably 75° or more, and even more preferably 80° or more. The water wetting angle of the glass can be, for example, 120° or less, 110° or less, 100° or less, 98° or less, or 95° or less. However, since a larger water wetting angle indicates better water repellency, it is also preferable for the water wetting angle to exceed the above-mentioned values.

[0043] In the present invention and this specification, the water wetting angle of glass is the contact angle measured within 30 seconds after 0.1 ml ± 0.02 ml of water is dropped onto a glass surface in a measurement environment of an ambient temperature of 20°C ± 5°C and a relative humidity of 50% ± 20%. The arithmetic mean of the values ​​obtained from three measurements is taken as the water wetting angle of that glass. The three measurements can be performed at three different locations on the glass surface, or can be performed by repeatedly removing the water dropped for the previous measurement by drying or other methods and then performing the measurement. If the arithmetic mean roughness Ra of the glass surface to be measured is 0.2 μm or less, the wetting angle shall be measured on that surface. If the arithmetic mean roughness Ra of the glass surface to be measured exceeds 0.2 μm, the wetting angle with water shall be measured on a surface that has been ground and polished to an Ra of 0.2 μm or less. The arithmetic mean roughness Ra is a surface quality parameter specified in JIS B 0601:2013. By determining the wetting angle with water on a surface with an Ra of 0.2 μm or less, the water repellency of the glass itself can be evaluated more accurately.

[0044] (Water Resistance Dw) In one embodiment, the glass can also have excellent water resistance. Water resistance can be evaluated by the water resistance Dw determined in accordance with the Japan Optical Glass Industry Association standard JOGIS-06:2019 "Method for measuring chemical durability of optical glass (powder method)." In one embodiment, the water resistance Dw thus determined for the glass can be Grade 1.

[0045] (Knoop hardness Hk) In one embodiment, the glass may have excellent mechanical strength. Mechanical strength can be evaluated, for example, by hardness, e.g., by Knoop hardness. The hardness of the glass, as determined in accordance with the Japan Optical Glass Industry Association standard JOGIS-09:2019 "Method for Measuring Knoop Hardness of Optical Glass," can be, for example, 450 or more, preferably 500 or more, and more preferably 550 or more. The Knoop hardness of the glass can be, for example, 850 or less, 800 or less, or 750 or less, but may exceed the values ​​exemplified here. Glass with a high Knoop hardness value is preferred because it is less susceptible to scratches.

[0046] (Thermal properties) The glass transition temperature (Tg) can be used as an indicator of heat resistance. The glass transition temperature (Tg) can be determined as follows: In differential scanning calorimetry (DSC), when a glass sample is heated, an endothermic behavior associated with a change in specific heat, i.e., an endothermic peak, appears; further heating leads to an exothermic peak. DSC produces a differential scanning calorimetry curve (DSC curve), with the horizontal axis representing temperature and the vertical axis representing quantities corresponding to the heat generation and endothermic heat of the sample. The intersection of the tangent to the curve at the point where the slope of the curve becomes maximum when the endothermic peak appears from the baseline and the baseline is taken as the glass transition temperature (Tg). The glass transition temperature (Tg) can be measured using a differential scanning calorimeter at a heating rate of 10°C / min, using glass that has been thoroughly crushed in a mortar or the like as a sample. The glass transition temperature (Tg) of soda-lime glass is approximately 540°C. In contrast, the above-mentioned glass can have a glass transition temperature exceeding 550°C. Regarding thermal expansion properties, the average linear expansion coefficient α is a value measured using a thermomechanical analyzer (TMA) in accordance with JOGIS-16:2019 "Method for measuring the average linear expansion coefficient of optical glass near room temperature." The average linear expansion coefficient α at -30 to 70°C is 70 x 10 -7 In one embodiment, the glass has an average linear expansion coefficient α of 70×10 / °C or less at -30 to 70°C. -7 / °C or less.

[0047] The water repellency, chemical properties, mechanical properties, thermal properties, etc. of the above glass can be adjusted appropriately to obtain desired physical properties depending on the application.

[0048] (alkali resistance) In one embodiment, the glass can also have excellent alkali resistance. Regarding alkali resistance, the sample preparation method described in the Japan Optical Glass Industry Association Standard JOGIS-06:2019, "Method for Measuring the Chemical Durability of Optical Glass (Powder Method)," can be used. Powdered glass (particle size: 425-600 μm) equivalent in mass to 1 cubic centimeter of optical glass is placed in a platinum cage and immersed in a 0.01 mol / L NaOH aqueous solution at a liquid temperature of 50°C for 15 hours. The mass loss rate (hereinafter referred to as "mass loss rate in the powder method alkali resistance test") can be used as an indicator. In one embodiment, the mass loss rate of the glass in the powder method alkali resistance test is preferably 0.10% by mass or less, and more preferably less than 0.02% by mass. For example, by setting the content of glass components such as P2O5 within the aforementioned range, glass with excellent alkali resistance can be easily obtained.

[0049] [Goods] One aspect of the present invention relates to an article comprising glass. The article is selected from the group consisting of window materials, windshields, cover glass, mirrors, tableware, laboratory equipment, cooking utensils, washbasins, toilet bowls, gravestones, jewelry, artistic objects, glass fibers, and glass fiber molded articles, and the glass has the above glass composition and a wetting angle with water of 60° or greater. The glass composition and physical properties of the glass contained in the article are as described above for the glass according to one aspect of the present invention.

[0050] The article is an article selected from the group consisting of window materials, windshields, cover glasses, mirrors, tableware, laboratory equipment, cooking utensils, washstands, toilet bowls, gravestones, jewelry, art objects, glass fibers, and molded glass fiber articles. For example, the above-mentioned articles can contain the above-mentioned glass as part or all of window materials such as window glass for buildings such as residences, showcase glass, and shop window glass, car windshields, bus windshields, truck windshields, various worker windshields, side glass, rear glass, train windshields, train window glass, airplane windshields, helicopter windshields, drone windshields and cover glass, airplane window glass, helicopter window glass, windshields for ships such as high-speed boats, window glass, glass mirrors, mirrors having a glass-containing layer as a surface layer, glass tableware, glass laboratory equipment, glass cookware, sinks, toilet bowls, gravestones, jewelry such as necklaces, earrings, pierced earrings, and rings, art works installed outdoors or indoors, cover glass for various articles installed outdoors or indoors or used outdoors or indoors, such as optical equipment, glass fiber molded bodies, etc. In one embodiment, the above-mentioned article can be an article having a surface layer containing the above-mentioned glass.

[0051] For example, glass with excellent water repellency is most effective as a windshield for an automobile. Its high water-repellent effect and slip-off properties make it easy to remove raindrops even when driving at low speeds. It also improves the smoothness of the wiper, allowing for quieter operation and improving the durability of the wiper itself. By using glass with excellent water repellency in the windshield of an automobile, it becomes possible to maintain a stable and comfortable view for a long period of time. These effects are also effective for side windows, rear windows, side mirrors, monitor camera window materials, etc.

[0052] Water deposits are thought to be a phenomenon caused by bonding between the Si component contained in tap water and SiO2-based glass. In one embodiment, the glass can be glass that has low reactivity with Si, which can suppress the occurrence of water deposits.

[0053] The above-mentioned glass tends to have a higher specific gravity than soda lime glass, and therefore tends to have a larger total weight, but this has the advantage of improving sound insulation.

[0054] In addition, glass with excellent water repellency can also be used as a window material for trains, airplanes, etc. Glass with excellent water repellency is also effective as a window material for general buildings in improving visibility in rainy weather and reducing residual dirt, making it preferable for long-term use. Furthermore, by reducing the content of the coloring components exemplified above, glass with high transmittance and little coloring can be obtained.

[0055] Furthermore, glass with excellent water repellency and water resistance is suitable for bathroom mirrors. It is difficult for water droplets to remain, making it easy to see through, and it can maintain excellent performance even after long-term use. It is also effective as a viewing mirror installed outdoors. In one embodiment, from the viewpoint of water resistance, it is preferable that the B2O3 content is 25% or less.

[0056] For example, by melting and dip-coating the glass on a common soda-lime glass substrate and then subjecting it to a predetermined annealing process, water repellency can be imparted to the surface of glass of various shapes. Because the glass has low surface free energy, it can reduce the adhesive strength of various substances. A surface with low free energy feels smooth to the touch, is less susceptible to fingerprints, and easily removes any fingerprints that do appear. Taking advantage of this property, the glass can be used for applications such as fingerprint authentication device windows and smartphone cover glass. Furthermore, the glass can also be used for tableware and containers, and its ease of draining after washing reduces cleaning effort and improves hygiene. In one embodiment, the glass can have a relatively high refractive index and high light dispersion. When such glass is used as glass, it can produce a sparkling light. Furthermore, glass with high hardness is resistant to scratches, ensuring long-term transparency. Glass with a relatively high specific gravity is advantageous for producing products with a heavy feel. Glass with low thermal expansion can reduce the occurrence of cracks due to sudden temperature changes. Furthermore, as one form of the above glass, glass with a total content of ZnO and La2O3 (ZnO + La2O3) of 60% or more tends to have lower thermal conductivity and specific heat than soda-lime glass. Glass with low thermal conductivity and specific heat has a high heat retention effect and reduces the temperature difference when touched. Furthermore, in the case of teapots and the like, having a highly water-repellent surface is effective in reducing dripping when pouring hot water. In the case of glasses and coffee cups, having a highly water-repellent surface can also reduce dripping.

[0057] In one embodiment, the surface of the glass can be treated depending on the intended use. For example, the surface can be ground with #60, #320, #800, or #1200 abrasive grains or softened by pressing to create fine irregularities on the surface, further reducing water wetting. It can also provide excellent water repellency when used as a ground glass material for windows.

[0058] Furthermore, by appropriately blending a coloring component with the above glass, a colored article having water repellency can be obtained.

[0059] In one embodiment, the glass can be a crystal-containing glass. Crystal-containing glass is generally also called crystallized glass, and is less likely to break than amorphous glass materials because it tends to suppress the progression of scratches. By adjusting the glass composition and crystallization conditions, it is possible to obtain a crystal-containing glass that is useful as a building material for exterior walls, flooring, roofing, and other materials, having the desired water repellency, mechanical strength, and chemical durability. Furthermore, by using the crystal-containing glass in toilet bowls, washbasins, and the like, it is possible to obtain an effect of reducing the adhesion of dirt and limescale.

[0060] In one embodiment, the glass can have a higher refractive index than soda-lime glass. Glass with a high refractive index has the characteristic of having a high light reflection. Such glass is preferable as decorative glass for outdoor display.

[0061] The durability of the above glass can be improved by appropriately coloring it and adjusting its composition, and by using such glass as a gravestone, it is possible to obtain a gravestone that is resistant to dirt, easy to clean, and can be kept clean for a long period of time.

[0062] Furthermore, by applying the glass powder to various materials, it is possible to form a water-repellent coating, which can contribute to improving heat resistance as well as water repellency.

[0063] Enamel glazes using crystallized glass powder can prevent adhesion of burnt food.

[0064] Glass with excellent water repellency can prevent water from entering narrow gaps due to capillary action, and by adjusting the glass composition depending on the target liquid, it is also possible to adjust the surface tension, wetting and penetration of the liquid.

[0065] In scientific laboratory equipment such as glass graduated cylinders, burettes, and measuring flasks, accurate measurements can be difficult to make due to the meniscus becoming wet, making the markings difficult to see. However, glass with excellent water repellency makes accurate measurements possible. In this case, it is particularly preferable for the wetting angle with respect to water to be around 90° (e.g., around 85° to 95°). This also applies to measuring instruments for cooking, which are a type of cooking equipment.

[0066] The glass fibers formed into fibers and the fibers produced from them are resistant to water wetting and can be used for various molded articles for ships, glass wool insulation materials with high thermal insulation properties, etc.

[0067] Glass fibers made of glass with excellent alkali resistance are useful as glass fibers for cement reinforcement. In addition, glass with excellent alkali resistance is highly resistant to alkaline soapy water, and is therefore useful as a material for glass bathroom mirrors and the surface layer of bathroom mirrors. [Example]

[0068] The present invention will be described in more detail below with reference to examples, although the present invention is not limited to the embodiments.

[0069] For Examples 1 to 47 and Comparative Examples 1 to 5, the raw materials for incorporating each component were weighed and thoroughly mixed to obtain the glass compositions shown in Table 1 below (Tables 1-1 to 1-4), respectively. As raw materials, oxides of each component were used. For Example 8, ZnO and ZnF2 were used as Zn raw materials, and oxides of each component were used as the other raw materials. 100 to 200 g of the prepared raw materials were melted at 1200° C. to 1400° C. using a platinum crucible, poured into an iron mold, and annealed after molding to produce a glass plate. The glass constituting the glass plates of Examples 12, 22, 26, and 28 was a crystal-containing glass, and the glass constituting the glass plates of the other Examples was an amorphous glass.

[0070] The water wetting angle, water resistance Dw, and Knoop hardness Hk of the prepared glass plates were determined by the methods described above. For the glass plates of Examples 1 to 39, the mass loss rate was determined in the powder method alkali resistance test by the method described above. Furthermore, when the water sliding property of the glass plate of Example 10 was measured in a measurement environment with an ambient temperature of 20°C ± 5°C and a relative humidity of 50% ± 20%, it was confirmed that a 0.1 ml water droplet slid down when the inclination angle of the surface of the glass plate relative to the horizontal plane (water sliding angle) was 40°.

[0071] In the following table, the units of content are mass %. "A" indicates the total content of SiO2, B2O3, and P2O5 (SiO2 + B2O3 + P2O5), "B" indicates the total content of ZnO, MgO, CaO, SrO, BaO, Y2O3, La2O3, Gd2O3, ZrO2, TiO2, Al2O3, Nb2O5, Ta2O5, WO3, and Bi2O3 (ZnO + MgO + CaO + SrO + BaO + Y2O3 + La2O3 + Gd2O3 + ZrO2 + TiO2 + Al2O3 + Nb2O5 + Ta2O5 + WO3 + Bi2O3), and "C" indicates the total content of Li2O, Na2O, K2O, Rb2O, and Cs2O (Li2O + Na2O + K2O + Rb2O + Cs2O).

[0072] In the following table, the numerical value written under "Dw" indicates the Dw grade, i.e., "1" indicates grade 1, "3" indicates grade 3.

[0073] [Table 1-1]

[0074] [Table 1-2]

[0075] [Table 1-3]

[0076] [Table 1-4]

[0077] As shown in Table 1, all of the glasses of the examples had a wetting angle with respect to water of 60° or more.

[0078] As Reference Example 1, the wetting angle of stainless steel SUS304 to water was similarly determined and found to be 68°. As Reference Example 2, the wetting angle of PTFE (polytetrafluoroethylene), which is generally recognized as a water-repellent material, was similarly determined and found to be 90°.

[0079] From the above results, it can be confirmed that the glasses of the examples have excellent water repellency, similar to materials known to have high water repellency.

[0080] Comparative Example 1 is an optical glass (equivalent to BSC7 manufactured by HOYA Corporation) with an SiO2 content of over 60%. It has a high SiO2 content and a high total content of Li2O, Na2O, K2O, Rb2O, and Cs2O (Li2O + Na2O + K2O + Rb2O + Cs2O). In the glass composition of Comparative Example 2, the P2O5 content is high, and the total content of SiO2, B2O3 and P2O5 (SiO2+B2O3+P2O5) is also high. In the glass composition of Comparative Example 3, the total content of SiO2, B2O3 and P2O5 (SiO2+B2O3+P2O5) is high. In the glass compositions of Comparative Examples 4 and 5, the total content of ZnO, MgO, CaO, SrO, BaO, Y2O3, La2O3, Gd2O3, ZrO2, TiO2, Al2O3, Nb2O5, Ta2O5, WO3, and Bi2O3 (ZnO+MgO+CaO+SrO+BaO+Y2O3+La2O3+Gd2O3+ZrO2+TiO2+Al2O3+Nb2O5+Ta2O5+WO3+Bi2O3) was low. Comparative Example 6 is a commercially available soda-lime glass, which has an SiO2 content of more than 70% and a high total content of Li2O, Na2O, K2O, Rb2O, and Cs2O (Li2O+Na2O+K2O+Rb2O+Cs2O). The glasses of Comparative Examples 1 to 6 having the above glass compositions all had a wetting angle with respect to water of less than 60°, and were inferior in water repellency to the glasses of the Examples.

[0081] The glass of each example had a mass loss rate of 0.10% by mass or less in the powder method alkali resistance test, confirming its excellent alkali resistance. When the powder method alkali resistance test was also conducted on soda lime glass, which is commonly used as a window material, the mass loss rate was 0.25% by mass.

[0082] For the glasses of Examples 40 to 47, glass plates having a thickness of 2.5 mm were prepared by the above method, and the spectral transmittance of the prepared glasses was measured to obtain spectral transmittance curves (FIGS. 1 to 8). The spectral transmittance curves shown in Figures 1 to 8 confirm that the absorption characteristics of the glass could be varied by adding components useful for color adjustment, i.e., the color of the glass could be easily adjusted.

[0083] Finally, the above-mentioned aspects will be summarized.

[0084] According to one embodiment, in a glass composition based on oxides, the SiO2 content is 0 to 25%, the B2O3 content is 0 to 35%, the P2O5 content is 0 to 30%, the total content of SiO2, B2O3 and P2O5 (SiO2 + B2O3 + P2O5) is 10 to 45%, the Al2O3 content is 0 to 15%, the Li2O content is 0 to 2%, the Na2O content is 0 to 10%, the K2O content is 0 to 10%, the Rb2O content is 0 to 5%, the Cs2O content is 0 to 5%, and the total content of Li2O, Na2O, K2O, Rb2O and Cs2O (Li 2O+Na2O+K2O+Rb2O+Cs2O) 0-15%, MgO content 0-20%, CaO content 0-25%, SrO content 0-25%, BaO content 0-30%, ZnO content 0-60%, La2O3 content 0-50%, Y2O3 content 0-15%, Gd2O3 content 0-25%, Yb2O3 content 0-10%, CeO2 content 0-10%, ZrO2 content 0-15%, TiO2 content 0-20%, SnO2 content 0-10%, Nb2O5 content 0-30%, Ta2O5 content 0 ~15%, WO3 content 0~15%, Bi2O3 content 0~20%, Ga2O3 content 0~5%, In2O3 content 0~5%, GeO2 content 0~5%, Sb2O3 content 0~1%, ZnO, MgO, CaO, SrO, BaO, Y2O3, La2O3, Gd2O3, ZrO2, TiO2, Al2O3, Nb2O5, Ta2O5, total content of WO3 and Bi2O3 (ZnO+MgO+CaO+SrO+BaO+Y2O3+La2O3+Gd2O3+ZrO2+TiO2+Al2O3+Nb2O5+Ta2 The present invention provides a glass (excluding glasses used for optical elements selected from the group consisting of lenses and prisms, and glasses used for optical fibers) having a total content of V2O5, Cr2O3, MnO2, Co2O3, NiO, CuO, MoO, Au2O3, and Ag2O (V2O5+Cr2O3+MnO2+Co2O3+NiO+CuO+MoO+Au2O3+Ag2O) of 55 to 90%, a Fe2O3 content of 0 to 10%, and a total content of V2O5, Cr2O3, MnO2, Co2O3, NiO, CuO, MoO, Au2O3, and Ag2O (V2O5+Cr2O3+MnO2+Co2O3+NiO+CuO+MoO+Au2O3+Ag2O) of 0 to 3%, and having a wetting angle with water of 60° or greater.

[0085] The glass can exhibit excellent water repellency.

[0086] In one embodiment, an article comprising glass is provided, the article being selected from the group consisting of window materials, windshields, cover glass, mirrors, tableware, laboratory equipment, cooking utensils, washbasins, toilet bowls, gravestones, jewelry, art objects, glass fibers, and molded glass fiber articles, and the glass has a glass composition based on oxides that, by mass, contains 0 to 25% SiO, 0 to 35% BO, 0 to 30% PO, the total content of SiO, BO, and PO (SiO + BO + PO) is 10 to 45%, 0 to 15% AlO, and 0 to 15% LiO. ~2%, Na2O content 0-10%, K2O content 0-10%, Rb2O content 0-5%, Cs2O content 0-5%, total content of Li2O, Na2O, K2O, Rb2O and Cs2O (Li2O+Na2O+K2O+Rb2O+Cs2O) 0-15%, MgO content 0-20%, CaO content 0-25%, SrO content 0-25%, BaO content 0-30%, ZnO content 0-60%, La2O3 content 0-50%, Y2O3 content 0-15%, Gd2O3 content 0-25%, Yb2O3 content 0-10 %, CeO2 content 0-10%, ZrO2 content 0-15%, TiO2 content 0-20%, SnO2 content 0-10%, Nb2O5 content 0-30%, Ta2O5 content 0-15%, WO3 content 0-15%, Bi2O3 content 0-20%, Ga2O3 content 0-5%, In2O3 content 0-5%, GeO2 content 0-5%, Sb2O3 content 0-1%, ZnO, MgO, CaO, SrO, BaO, Y2O3, La2O3, Gd2O3, ZrO2, TiO2, Al2O3, Nb2O5, Ta2O5, WO3 and The glass has a total content of ZnO and Bi2O3 (ZnO+MgO+CaO+SrO+BaO+Y2O3+La2O3+Gd2O3+ZrO2+TiO2+Al2O3+Nb2O5+Ta2O5+WO3+Bi2O3) of 55 to 90%, a Fe2O3 content of 0 to 10%, and a total content of V2O5, Cr2O3, MnO2, Co2O3, NiO, CuO, MoO, Au2O3 and Ag2O (V2O5+Cr2O3+MnO2+Co2O3+NiO+CuO+MoO+Au2O3+Ag2O) of 0 to 3%, and a wetting angle with water of 60° or more.

[0087] The glass and the glass contained in the article may be in the following forms:

[0088] In one embodiment, the total content of SiO2, B2O3, and P2O5 (SiO2 + B2O3 + P2O5) can be 10 to 35%, and the total content of ZnO, MgO, CaO, SrO, BaO, Y2O3, La2O3, Gd2O3, ZrO2, TiO2, Al2O3, Nb2O5, Ta2O5, WO3, and Bi2O3 (ZnO + MgO + CaO + SrO + BaO + Y2O3 + La2O3 + Gd2O3 + ZrO2 + TiO2 + Al2O3 + Nb2O5 + Ta2O5 + WO3 + Bi2O3) can be 55 to 85%.

[0089] In one embodiment, the SiO2 content can be 1-8%, the B2O3 content can be 8-25%, the ZnO content can be 3-35%, the La2O3 content can be 15-45%, the ZrO2 content can be 1-8%, the total content of SiO2, B2O3, and P2O5 (SiO2 + B2O3 + P2O5) can be 15-30%, and the total content of ZnO, MgO, CaO, SrO, BaO, Y2O3, La2O3, Gd2O3, ZrO2, TiO2, Al2O3, Nb2O5, Ta2O5, WO3, and Bi2O3 (ZnO + MgO + CaO + SrO + BaO + Y2O3 + La2O3 + Gd2O3 + ZrO2 + TiO2 + Al2O3 + Nb2O5 + Ta2O5 + WO3 + Bi2O3) can be 65-85%.

[0090] In one embodiment, the wetting angle of the glass with respect to water can be 80° or more.

[0091] In one embodiment, the water resistance Dw of the glass can be grade 1.

[0092] In one embodiment, the Knoop hardness Hk of the glass can be 450 or greater, or 550 or greater.

[0093] In one embodiment, the mass loss rate of the glass in a powder method alkali resistance test can be 0.10% by mass or less.

[0094] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. For example, by adjusting the composition as described in the specification for the glass composition exemplified above, a glass according to one aspect of the present invention can be obtained. Furthermore, it is of course possible to arbitrarily combine two or more of the items described in the specification as examples or preferred ranges or embodiments.

Claims

1. In the oxide-based glass composition, By mass, SiO ２ Content is 0-25%, B ２ O ３ Content is 0-35%, P ２ O ５ Content is 0-30%, SiO ２ , B ２ O ３ and P ２ O ５ The total content (SiO ２ +B ２ O ３ +P ２ O ５ ) is 10-45%, Al ２ O ３ Content is 0-15%, Li ２ O content is 0-2%. Na ２ O content is 0 to 10%, K ２ O content is 0 to 10%, Rb ２ O content is 0 to 5%, Cs ２ O content is 0 to 5%, Li ２ O, Na ２ O.K. ２ O, Rb ２ O and Cs ２ The total content of O (Li ２ O + Na ２ O+K ２ O+Rb ２ O+Cs ２ O) is 0 to 15%, MgO content 0-20%, CaO content of 0 to 25%, SrO content of 0 to 25%, BaO content is 0 to 30%, ZnO content 0-60%, La ２ O ３ Content is 0-50%, Y ２ O ３ Content is 0-15%, Gd ２ O ３ Content is 0-25%, Yb ２ O ３ Content is 0-10%, CeO ２ Content is 0-10%, ZrO ２ Content is 0-15%, TiO ２ Content is 0-20%, SnO ２ Content is 0-10%, Nb ２ O ５ Content is 0-30%, Ta ２ O ５ Content is 0-15%, WO ３ Content is 0-15%, Bi ２ O ３ Content is 0-20%, Ga ２ O ３ Content is 0-5%, In ２ O ３ Content is 0-5%, GeO ２ Content is 0-5%, Sb ２ O ３ Content is 0-1%, ZnO, MgO, CaO, SrO, BaO, Y ２ O ３ , La ２ O ３ , Gd ２ O ３ , ZrO ２ , TiO ２ , Al ２ O ３ , Nb ２ O ５ , Ta ２ O ５ , W.O. ３ and Bi ２ O ３ The total content of ZnO + MgO + CaO + SrO + BaO + Y ２ O ３ +La ２ O ３ +Gd ２ O ３ + ZrO ２ + TiO ２ +Al ２ O ３ +Nb ２ O ５ +Ta ２ O ５ +WO ３ +Bi ２ O ３ ) is 55 to 90%, Fe ２ O ３ Content is 0-10%, V ２ O ５ , Cr ２ O ３ , MnO ２ , Co ２ O ３ , NiO, CuO, MoO, Au ２ O ３ and Ag ２ Total content of O (V ２ O ５ +Cr ２ O ３ + MnO ２ +Co ２ O ３ +NiO+CuO+MoO+Au ２ O ３ + Ag ２ O) is 0 to 3%, and Glass having a wetting angle with respect to water of 60° or more (excluding glasses used for optical elements selected from the group consisting of lenses and prisms, and glasses used for optical fibers).

2. SiO ２ , B ２ O ３ and P ２ O ５ The total content (SiO ２ +B ２ O ３ +P ２ O ５ ) is 10 to 35%, ZnO, MgO, CaO, SrO, BaO, Y ２ O ３ , La ２ O ３ , Gd ２ O ３ , ZrO ２ , TiO ２ , Al ２ O ３ , Nb ２ O ５ , Ta ２ O ５ , W.O. ３ and Bi ２ O ３ The total content of ZnO + MgO + CaO + SrO + BaO + Y ２ O ３ +La ２ O ３ +Gd ２ O ３ + ZrO ２ + TiO ２ +Al ２ O ３ +Nb ２ O ５ +Ta ２ O ５ +WO ３ +Bi ２ O ３ ) is 55-85%, 2. The glass of claim 1 wherein

3. SiO ２ Content is 1-8%, B ２ O ３ Content is 8-25%, ZnO content is 3-35%, La ２ O ３ Content is 15-45%, ZrO ２ Content is 1-8%, SiO ２ , B ２ O ３ and P ２ O ５ The total content (SiO ２ +B ２ O ３ +P ２ O ５ ) is 15-30%, ZnO, MgO, CaO, SrO, BaO, Y ２ O ３ , La ２ O ３ , Gd ２ O ３ , ZrO ２ , TiO ２ , Al ２ O ３ , Nb ２ O ５ , Ta ２ O ５ , W.O. ３ and Bi ２ O ３ The total content of ZnO + MgO + CaO + SrO + BaO + Y ２ O ３ +La ２ O ３ +Gd ２ O ３ + ZrO ２ + TiO ２ +Al ２ O ３ +Nb ２ O ５ +Ta ２ O ５ +WO ３ +Bi ２ O ３ ) is 65-85%, 3. The glass of claim 1 or 2, wherein

4. 4. The glass according to claim 1, which has a wetting angle with respect to water of 80° or more.

5. 5. A glass according to claim 1, having a water resistance Dw of grade 1.

6. 6. The glass according to claim 1, having a Knoop hardness Hk of 450 or more.

7. 7. The glass according to claim 1, having a Knoop hardness Hk of 550 or more.

8. 8. The glass according to claim 1, wherein the mass loss rate in a powder method alkali resistance test is 0.10 mass% or less.

9. An article comprising glass, the article is an article selected from the group consisting of window materials, windshields, cover glasses, mirrors, tableware, laboratory equipment, cooking utensils, washstands, toilet bowls, gravestones, jewelry, art objects, glass fibers, and molded glass fiber articles; The glass is In the oxide-based glass composition, By mass, SiO ２ Content is 0-25%, B ２ O ３ Content is 0-35%, P ２ O ５ Content is 0-30%, SiO ２ , B ２ O ３ and P ２ O ５ The total content (SiO ２ +B ２ O ３ +P ２ O ５ ) is 10-45%, Al ２ O ３ Content is 0-15%, Li ２ O content is 0-2%. Na ２ O content is 0 to 10%, K ２ O content is 0 to 10%, Rb ２ O content is 0 to 5%, Cs ２ O content is 0 to 5%, Li ２ O, Na ２ O.K. ２ O, Rb ２ O and Cs ２ The total content of O (Li ２ O + Na ２ O+K ２ O+Rb ２ O+Cs ２ O) is 0 to 15%, MgO content 0-20%, CaO content of 0 to 25%, SrO content of 0 to 25%, BaO content is 0 to 30%, ZnO content 0-60%, La ２ O ３ Content is 0-50%, Y ２ O ３ Content is 0-15%, Gd ２ O ３ Content is 0-25%, Yb ２ O ３ Content is 0-10%, CeO ２ Content is 0-10%, ZrO ２ Content is 0-15%, TiO ２ Content is 0-20%, SnO ２ Content is 0-10%, Nb ２ O ５ Content is 0-30%, Ta ２ O ５ Content is 0-15%, WO ３ Content is 0-15%, Bi ２ O ３ Content is 0-20%, Ga ２ O ３ Content is 0-5%, In ２ O ３ Content is 0-5%, GeO ２ Content is 0-5%, Sb ２ O ３ Content is 0-1%, ZnO, MgO, CaO, SrO, BaO, Y ２ O ３ , La ２ O ３ , Gd ２ O ３ , ZrO ２ , TiO ２ , Al ２ O ３ , Nb ２ O ５ , Ta ２ O ５ , W.O. ３ and Bi ２ O ３ The total content of ZnO + MgO + CaO + SrO + BaO + Y ２ O ３ +La ２ O ３ +Gd ２ O ３ + ZrO ２ + TiO ２ +Al ２ O ３ +Nb ２ O ５ +Ta ２ O ５ +WO ３ +Bi ２ O ３ ) is 55 to 90%, Fe ２ O ３ Content is 0-10%, V ２ O ５ , Cr ２ O ３ , MnO ２ , Co ２ O ３ , NiO, CuO, MoO, Au ２ O ３ and Ag ２ Total content of O (V ２ O ５ +Cr ２ O ３ + MnO ２ +Co ２ O ３ +NiO+CuO+MoO+Au ２ O ３ + Ag ２ O) is 0 to 3%, and The article is glass having a wetting angle with respect to water of 60° or more.

10. The glass is SiO ２ , B ２ O ３ and P ２ O ５ The total content (SiO ２ +B ２ O ３ +P ２ O ５ ) is 10 to 35%, ZnO, MgO, CaO, SrO, BaO, Y ２ O ３ , La ２ O ３ , Gd ２ O ３ , ZrO ２ , TiO ２ , Al ２ O ３ , Nb ２ O ５ , Ta ２ O ５ , W.O. ３ and Bi ２ O ３ The total content of ZnO + MgO + CaO + SrO + BaO + Y ２ O ３ +La ２ O ３ +Gd ２ O ３ + ZrO ２ + TiO ２ +Al ２ O ３ +Nb ２ O ５ +Ta ２ O ５ +WO ３ +Bi ２ O ３ ) is 55-85%, 10. The article of claim 9, wherein:

11. The glass is SiO ２ Content is 1-8%, B ２ O ３ Content is 8-25%, ZnO content is 3-35%, La ２ O ３ Content is 15-45%, ZrO ２ Content is 1-8%, SiO ２ , B ２ O ３ and P ２ O ５ The total content (SiO ２ +B ２ O ３ +P ２ O ５ ) is 15-30%, ZnO, MgO, CaO, SrO, BaO, Y ２ O ３ , La ２ O ３ , Gd ２ O ３ , ZrO ２ , TiO ２ , Al ２ O ３ , Nb ２ O ５ , Ta ２ O ５ , W.O. ３ and Bi ２ O ３ The total content of ZnO + MgO + CaO + SrO + BaO + Y ２ O ３ +La ２ O ３ +Gd ２ O ３ + ZrO ２ + TiO ２ +Al ２ O ３ +Nb ２ O ５ +Ta ２ O ５ +WO ３ +Bi ２ O ３ ) is 65-85%, 11. The article of claim 9 or 10,

12. The article according to any one of claims 9 to 11, wherein the wetting angle of the glass with respect to water is 80° or more.

13. The article according to any one of claims 9 to 12, wherein the water resistance Dw of the glass is grade 1.

14. The article according to any one of claims 9 to 13, wherein the glass has a Knoop hardness Hk of 450 or more.

15. The article according to any one of claims 9 to 14, wherein the glass has a Knoop hardness Hk of 550 or more.

16. The article according to any one of claims 9 to 15, wherein the mass loss rate of the glass in a powder method alkali resistance test is 0.10 mass% or less.

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