Glass fiber and compositions for glass fiber

Abstract

This invention provides a glass composition for glass fibers, comprising, in weight percent: SiO2: 59.5-62.5%, Al2O3: 19-21.2%, B2O3: 0-0.5%, MgO: 16-18%, CaO: 0-1.5%, Li2O: 0-1.0%, Na2O: 0-0.2%, K2O: 0-0.1%, TiO2: 0-5%, ZrO2: 0-5%, ZnO: 0-1.5%, and F2: 0-0.1%.

Description

Technical Field

[0001] This invention relates to glass fibers and glass compositions suitable for glass fibers. Background Technology

[0002] Most glass fibers used in practical applications are composed of glass compositions with a Young's modulus of 90 GPa or less. However, glass compositions with a Young's modulus exceeding 90 GPa are also known. For example, Patent Document 1 discloses a glass composition containing a large amount of rare earth oxides. The combined content of Y₂O₃ and La₂O₃ in the glass composition of Patent Document 1 is in the range of 20 to 60% by weight. However, if the content of rare earth oxides is high, the manufacturing cost increases. Considering this, Patent Document 2 discloses a technique for increasing the Young's modulus of a glass composition without requiring a large amount of rare earth oxides. In the glass composition of Patent Document 2, 15 to 30% MgO (expressed as mol%) is included as a component for increasing the Young's modulus.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2006 / 057405

[0006] Patent Document 2: Japanese Patent No. 6391875 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] Patent Document 2 did not investigate the acid resistance of the glass composition. Furthermore, in the mass production of glass fibers and other glass molded articles, it is desirable to be able to continuously produce them without devitrification. Therefore, the object of the present invention is to provide glass fibers with high Young's modulus, excellent acid resistance, and suitability for mass production, and glass compositions suitable for the manufacture of such glass fibers.

[0009] means for solving problems

[0010] The inventors have repeatedly studied the mixing ratio of glass components and have completed a glass composition suitable for glass fibers with excellent balance of acid resistance, Young's modulus and mass production.

[0011] This invention provides a glass composition for glass fibers, wherein,

[0012] It contains, expressed as a percentage by mass:

[0013]

[0014] In addition, the present invention provides a glass fiber comprising the glass composition for glass fibers of the present invention.

[0015] Invention Effects

[0016] According to the present invention, glass fibers with an excellent balance of acid resistance, Young's modulus and mass production properties can be provided, and glass compositions for glass fibers suitable for such glass fibers can be provided. Detailed Implementation

[0017] The following describes embodiments of the present invention, but the purpose of this description is not to limit the present invention to specific embodiments. In this specification, the content of the components in the following glass compositions is expressed in terms of mass % (%), and essentially mass % is expressed as "%". In this specification, "substantially not containing" and "substantially not containing" mean a content of less than 0.1% by mass, less than 0.05% by mass, less than 0.01% by mass, less than 0.005% by mass, further less than 0.003% by mass, and, in some cases, less than 0.001% by mass. The meaning of "substantially" is that trace amounts of impurities from glass raw materials, manufacturing equipment, etc., are permissible. "Alkali metal oxides" refer to Li₂O, Na₂O, and K₂O, sometimes referred to as R₂O. The upper and lower limits of the content described below can be arbitrarily combined in two ways: when the upper and lower limits are stated separately, or when the upper and lower limits are stated in the form of a range.

[0018] [Glass Composition]

[0019] <ingredients>

[0020] The components of the glass composition that can constitute this embodiment will be described below.

[0021] (SiO2)

[0022] SiO2 is a component that forms the framework of glass and is also used to adjust the devitrification temperature and viscosity during glass formation, as well as improve acid resistance. The SiO2 content is, for example, 59.5% to 62.5%. The lower limit of the SiO2 content can be 59.6% or higher, 59.8% or higher, and further 60% or higher. The upper limit of the SiO2 content can be 62.3% or lower, 62% or lower, 61.8% or lower, and further 61.5% or lower. The SiO2 content can be 59.6% to 61.5%.

[0023] (Al2O3)

[0024] Al₂O₃ is a component used to adjust the devitrification temperature and viscosity during glass formation, and it helps improve the water resistance of glass. The content of Al₂O₃ is, for example, 19–21.2%. The lower limit of the Al₂O₃ content can be, for example, 19.3% or more, 19.5% or more, 19.7% or more, and further 20% or more. The upper limit of the Al₂O₃ content can be 21% or less, 20.8% or less, and further 20.6% or less. The Al₂O₃ content can be 19.7%–20.6%.

[0025] (B2O3)

[0026] B2O3 is an arbitrary component that forms the framework of glass and adjusts the devitrification temperature and viscosity during glass formation. The content of B2O3 can be, for example, 0 to 0.5%. The lower limit of the B2O3 content can be 0.02% or more. The upper limit of the B2O3 content can be less than 0.3%, less than 0.1%, and further less than 0.08%. B2O3 may also be substantially absent.

[0027] (MgO)

[0028] MgO is a component that contributes to increasing Young's modulus and influences devitrification temperature and viscosity. The MgO content is typically 16-18%. The lower limit for MgO content can be 16.5% or higher, 16.6% or higher, 16.8% or higher, and further 17% or higher. The upper limit for MgO content can be 17.8% or lower, 17.7% or lower, and further 17.6% or lower. The MgO content can range from 16.6% to 17.6%.

[0029] (CaO)

[0030] CaO is any component used to adjust the devitrification temperature and viscosity during glass formation. The CaO content is, for example, 0 to 1.5%. The lower limit of the CaO content can be 0.1% or more, 0.3% or more, 0.5% or more, and further 0.7% or more. The upper limit of the CaO content can be 1.4% or less, 1.3% or less, 1.2% or less, and further 1% or less.

[0031] (Alkali metal oxides)

[0032] Alkali metal oxides (R₂O) are arbitrary components used to adjust the devitrification temperature and viscosity during glass formation. The total content of alkali metal oxides, specifically Li₂O + Na₂O + K₂O, is, for example, 0 to 1.3%. The lower limit of the alkali metal oxide content can be 0.05% or more, 0.1% or more, 0.2% or more, and further 0.3% or more. The upper limit of the R₂O content can be 1.2% or less, 1.0% or less, 0.9% or less, and further 0.8% or less. When the R₂O content is high, the Young's modulus may not increase sufficiently.

[0033] The content of Li₂O is, for example, 0 to 1.0%. The lower limit of the content of Li₂O is 0.1% or more, 0.2% or more, and can be 0.3% or more, and further 0.4% or more. The upper limit of the content of Li₂O is 0.8% or less, 0.6% or less, and further 0.5% or less. A preferred example of the content of Li₂O is 0.1% to 0.8%. Regarding the adjustment of properties such as devitrification temperature while suppressing the effect of reducing Young's modulus, Li₂O is more advantageous than Na₂O and K₂O. The content of Li₂O can be higher than the content of Na₂O, higher than the content of K₂O, and higher than the combined content of Na₂O and K₂O. Of course, Li₂O can also be substantially absent.

[0034] The content of Na2O is, for example, 0 to 0.2%. The upper limit of the content of Na2O can be below 0.18%, below 0.15%, below 0.13%, below 0.1%, and further below 0.08%. Na2O may also be substantially absent.

[0035] The content of K2O is, for example, 0 to 0.1%. The upper limit of the content of K2O can be below 0.08%, then below 0.06%, and then below 0.04%. K2O may also be substantially absent.

[0036] (TiO2 and ZrO2)

[0037] TiO2 and ZrO2 are any components that can contribute to improved acid resistance. For example, TiO2 and ZrO2 are added in the range of 0 to 5%. The content of TiO2 and ZrO2 can be 0.1% or more, 0.3% or more, 0.5% or more, 1% or more, and further 1.2% or more, respectively. The content of TiO2 and ZrO2 can be 4% or less, 3% or less, 2.5% or less, and further 2% or less, respectively. However, TiO2 and ZrO2 may not be added, and the glass composition of this embodiment can have good acid resistance. TiO2 may also be substantially absent. ZrO2 may also be substantially absent.

[0038] (ZnO)

[0039] ZnO is an optional ingredient that can be added. ZnO can be added, for example, in the range of 0 to 1.5%. The upper limit of the ZnO content can be below 1.4%, below 1%, and further below 0.5%. ZnO may also be substantially absent.

[0040] (F2)

[0041] F2 is also any ingredient that may be added for purposes such as clarification. F2 may be added in the range of 0 to 0.1%. The maximum content of F2 can be below 0.08%. F2 may also be substantially absent.

[0042] (SiO2+TiO2+ZrO2)

[0043] The total content of SiO2, TiO2, and ZrO2 (SiO2+TiO2+ZrO2) can be 60% or more, 60.5% or more, or even 61% or more. Glass compositions with a high content of (SiO2+TiO2+ZrO2) are suitable for achieving excellent acid resistance. There is no particular upper limit to the content of (SiO2+TiO2+ZrO2), for example, it can be 63.5% or less, 63% or less, or even 62.5% or less.

[0044] (TiO2+ZrO2)

[0045] The total content of TiO2 and ZrO2 (TiO2 + ZrO2) can be 0.1% or more, 0.2% or more, 0.5% or more, and further 1% or more. Glass compositions with (TiO2 + ZrO2) within suitable ranges are suitable for achieving excellent acid resistance. There is no particular upper limit to the content of (TiO2 + ZrO2), for example, 5% or less, and further 3% or less. The glass composition can have 59.5% to 61.5%, and further 60% to 61%, of SiO2 and 0.1% to 3% of (TiO2 + ZrO2).

[0046] (SiO2+Al2O3+MgO)

[0047] The total content of SiO2, Al2O3 and MgO (SiO2+Al2O3+MgO) can be 95% or more, 96% or more, 97% or more, and further 97.5% or more. (SiO2+Al2O3+MgO) can be, for example, 99% or less, and further 98.5% or less.

[0048] (CaO+R2O)

[0049] The addition of CaO and alkali metal oxides (R2O) is suitable for adjusting the devitrification temperature of the glass composition. The total content of CaO and R2O (CaO+R2O) can be 0 to 2.5%. The lower limit of (CaO+R2O) can be 0.05% or more, 0.1% or more, 0.3% or more, 0.5% or more, 0.7% or more, and further 1% or more. The upper limit of (CaO+R2O) can be, for example, 2.3% or less, 2.2% or less, 2% or less, and further 1.8% or less.

[0050] (Other ingredients)

[0051] The glass composition may contain components other than those described above. Examples of other components that may be included in the glass composition include Fe2O3, Y2O3, La2O3, SrO, BaO, Cl2, SnO2, CeO2, P2O5, and SO3.

[0052] Fe2O3 is added, for example, in the range of 0 to 1%. The upper limit of the Fe2O3 content can be 0.5%, below 0.3%, below 0.2%, and further below 0.15%. Fe2O3 may also be substantially absent. It should be noted that a portion of the iron oxide may exist in the glass composition in the form of FeO, but its content is converted into Fe2O3 according to conventional methods.

[0053] Y₂O₃ and La₂O₃ are any components that contribute to increasing Young's modulus. However, the raw materials for these components are relatively expensive. The combined content of Y₂O₃ and La₂O₃ is, for example, 0-5%. The upper limit for the combined content of Y₂O₃ and La₂O₃ can be less than 3%, less than 2%, less than 1%, and further less than 0.5%. Y₂O₃ may also be substantially absent. La₂O₃ may also be substantially absent.

[0054] The content of SrO, BaO, Cl2, SnO2, CeO2, P2O5, and SO3 is, for example, 0 to 0.5%. The upper limit of the content of each of these components can be below 0.3%, below 0.2%, and further below 0.1%. The above components may also be substantially absent.

[0055] <Characteristics>

[0056] (Young's modulus)

[0057] The glass composition of this embodiment has a Young's modulus of 97 GPa or higher, for example. The lower limit of the Young's modulus may also be set to 98 GPa or higher, 99 GPa or higher, or, depending on the situation, 100 GPa or higher. The upper limit of the Young's modulus is not particularly limited, and may be, for example, 115 GPa or lower, or even 110 GPa or lower.

[0058] (Acid resistance)

[0059] Acid resistance can be evaluated using the mass reduction rate ΔW1 (%) obtained through the tests described in the Example 1 column. The ΔW1 of the glass composition of this embodiment is, for example, 0.1% by mass or less. The upper limit of ΔW1 can be set to 0.08% by mass or less, 0.07% by mass or less, and further, 0.06% by mass or less.

[0060] (Alkali resistance)

[0061] Alkali resistance can be evaluated using the mass reduction rate ΔW2 (%) obtained through the tests described in the Example 1 column. The ΔW2 of the glass composition of this embodiment is, for example, 0.8% by mass or less. The upper limit of ΔW2 can also be set to 0.7% by mass or less, 0.65% by mass or less, and further, 0.6% by mass or less.

[0062] (density)

[0063] The density of the glass composition in this embodiment is, for example, 2.65 g / cm³. 3 The upper limit of density can also be set at 2.63 g / cm³. 3 Below, 2.6g / cm 3 The following, and then 2.59 g / cm 3 The lower limit of density is not specifically limited; for example, it can be 2.45 g / cm³. 3 Above, and further 2.5 g / cm 3 above.

[0064] (Characteristic Temperature)

[0065] In this embodiment, the viscosity of the molten glass is 10. 3 The temperature T3 at dPa·s is, for example, below 1370°C. The upper limit of T3 can also be set below 1360°C, 1350°C, 1345°C, and further below 1320°C. A low T3 can contribute to a longer lifespan for glass fiber manufacturing equipment. There is no particular limitation on the lower limit of T3, for example, above 1280°C. Similarly, the viscosity of the molten glass becomes 10... 2.5 The temperature T2.5 at dPa·s is, for example, below 1450℃.

[0066] The devitrification temperature (TL) is the temperature at which crystals form and begin to grow in the molten glass preform. TL is, for example, below 1360°C. The upper limit of TL can also be set below 1350°C, 1340°C, 1330°C, 1320°C, and further below 1300°C. The lower limit of TL is not particularly limited and can be above 1200°C, and further above 1230°C.

[0067] In this embodiment, TL can be set to a temperature lower than T3. In this case, the temperature difference T3-TL (=ΔT) takes a positive value (ΔT>0). The larger the temperature difference ΔT(T3-TL) obtained by subtracting the devitrification temperature from the operating temperature, the less likely devitrification will occur during glass forming, and the more homogeneous glass can be manufactured with a high yield. In this embodiment, the ΔT of the glass composition can be 2°C or higher, 5°C or higher, or even 10°C or higher. There is no particular upper limit to ΔT; it can be 50°C or lower, or even 40°C or lower.

[0068] In glass fibers, long glass fibers are typically manufactured by continuously winding molten glass preform into fibers using a winding machine after drawing it from a nozzle in a perforated plate located at the bottom of a furnace. Short glass fibers, for example, are manufactured by further stretching fibrous glass fibers ejected from the bottom of a furnace onto a high-speed rotating spinning machine using pressure such as gas jets, after centrifugal force has caused them to fly out from holes on the side of the spinning machine. Based on these manufacturing processes, it is understood that, for mass production, it is desirable for glass fiber compositions to have a positive ΔT.

[0069] [Glass fiber]

[0070] The glass composition of this embodiment is suitable for the manufacture of glass fibers. The glass fibers can be long glass fibers or short glass fibers. For example, the glass fibers can be in the form of at least one selected from bundled yarn, roving, yarn, cloth, chopped strands, glass wool, and abrasive fibers. The cloth can be, for example, roving cloth or spun cloth.

[0071] However, due to their excellent properties, the glass compositions described above can also be used in the form of glass molded articles other than glass fibers. An example of a glass molded article is particle-shaped glass. Particle-shaped glass can be manufactured by finely breaking it to the point of losing its shape as a glass fiber; or it can be manufactured using nozzles corresponding to the target shape, similar to glass fibers. The glass compositions described above are also suitable for manufacturing particle-shaped glass while avoiding devitrification. In one aspect of the invention, the particle-shaped glass comprises, or is composed of, the glass compositions described above.

[0072] Particle-shaped glass can be, for example, selected from at least one of flake glass, glass powder, glass beads, and fine flakes. Particle-shaped glass can also be used in applications oriented towards FRP, i.e., reinforcement of reinforced bodies represented by resin.

[0073] Considering that it can also be used for particle glass, the above-mentioned glass composition can also be used as a glass composition for glass fiber or particle glass.

[0074] [Non-woven fabric, rubber-reinforced wire]

[0075] The glass fibers provided by this invention can be used for the same purposes as existing glass fibers. According to one aspect of the invention, a glass fiber nonwoven fabric comprising glass fibers is provided. Additionally, according to another aspect of the invention, a rubber-reinforced filament comprising bundled yarns of glass fibers is provided. Glass fibers can also be used for other purposes. Other uses include reinforcement of the reinforced body, exemplified by resin.

[0076] [Example]

[0077] The embodiments of the present invention will now be described in more detail through examples and comparative examples. It should be noted that the content percentages of the components in the following tables are also expressed as mass %.

[0078] <Preparation of Glass Compositions>

[0079] Common glass raw materials such as silica sand were prepared in accordance with the compositions shown in Tables 1 and 2, and glass raw material batches were prepared in the examples and comparative examples respectively. Using an electric furnace, each batch was heated to 1500–1600°C to melt it, and maintained in this state for approximately 4 hours until the composition became homogeneous. Then, a portion of the molten glass (glass melt) was poured onto an iron plate and slowly cooled to room temperature in the electric furnace to obtain glass compositions (plates, glass samples) in bulk form. The properties of these glass compositions were evaluated as described below. The results are shown in Tables 1 and 2. Blank columns indicate no measurement.

[0080] (T2.5 and T3)

[0081] For the obtained glass composition, the relationship between viscosity and temperature was investigated using the conventional platinum ball pulling method, and T2.5 and T3 were determined based on the results. Here, the platinum ball pulling method refers to a method of determining viscosity by immersing a platinum ball in molten glass and pulling it up at a constant speed, substituting the relationship between the load (resistance) and the gravity and buoyancy acting on the platinum ball into Stokes' law, which describes the relationship between viscosity and falling velocity when tiny particles settle in a fluid.

[0082] (TL)

[0083] A glass composition pulverized to a particle size of 1.0–2.8 mm is placed in a platinum boat and held in an electric furnace with a temperature gradient (800–1400 °C) for 2 hours. The devitrification temperature TL is determined based on the highest temperature of the furnace corresponding to the location where crystallization occurs. If the glass becomes cloudy and crystallization cannot be observed, the highest temperature of the furnace corresponding to the location where the cloudiness occurs is taken as the devitrification temperature. Here, the particle size is determined by sieving. It should be noted that the temperature (temperature distribution within the furnace) varies depending on the location within the furnace, and the glass composition placed in a designated location within the furnace is heated at the pre-determined temperature of that designated location.

[0084] (Young's modulus)

[0085] For Young's modulus, the longitudinal wave velocity vl and transverse wave velocity vt of the elastic wave propagating in the glass are measured by the conventional ultrasonic method, based on the glass density ρ determined separately by Archimedes' method, and using E = 3ρ·v t 2 ·(v1 2-4 / 3·v t 2 ) / (v1 2 -v t 2 The formula is used to find the answer.

[0086] (Acid and alkali resistance)

[0087] A 15μm diameter glass single fiber was cut into 20mm lengths, and the weight in grams was measured to be the same as that of the glass. The mass reduction rate after immersing the glass fiber in 80mL of a sulfuric acid aqueous solution with a specific gravity of 1.2 at 99℃ for 60 minutes was calculated, and this mass reduction rate was defined as ΔW1. Additionally, a 15μm diameter glass single fiber was cut into 20mm lengths, and the weight in grams was measured to be the same as that of the glass. The mass reduction rate after immersing the glass fiber in 100mL of a 10% (w / w) sodium hydroxide aqueous solution at 80℃ for 24 hours was calculated, and this mass reduction rate was defined as ΔW2.

[0088] It should be noted that the mass before impregnation is set as Wa, and the mass after impregnation is set as Wb. The above mass reduction rate is calculated based on the following formula.

[0089] Weight reduction rate (%) = {(Wa-Wb) / Wa} × 100

[0090] [Table 1]

[0091] Example 1 2 3 4 5 6 7 <![CDATA[SiO2]]> 60.4 60.3 61.2 59.6 60.5 60.1 60.0 <![CDATA[Al2O3]]> 20.5 20.5 19.7 20.2 20.5 20.4 20.4 <![CDATA[B2O3]]> 0.06 0.06 0.06 0.06 0.00 0.00 0.06 MgO 17.5 17.5 17.6 16.6 17.6 16.8 16.7 CaO 0.9 0.9 0.9 0.9 0.9 0.9 0.9 <![CDATA[Li2O]]> 0.5 0.5 0.5 0.5 0.5 0.5 0.5 <![CDATA[Na2O]]> 0.0 0.1 0.0 0.0 0.0 0.0 0.0 <![CDATA[K2O]]> 0.0 0.0 0.1 0.0 0.0 0.0 0.0 <![CDATA[Fe2O3]]> 0.0 0.1 0.0 0.0 0.0 0.0 0.0 <![CDATA[TiO2]]> 0.0 0.0 0.0 0.0 0.0 1.3 0.0 <![CDATA[ZrO2]]> 0.0 0.0 0.0 2.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 1.4 <![CDATA[SiO2+TiO2+ZrO2]]> 60.4 60.3 61.2 61.6 60.5 61.4 60.0 <![CDATA[Acid resistance ΔW1]]> 0.07 0.07 0.03 0.05 0.07 0.02 0.07 <![CDATA[Alkali resistance ΔW2]]> 0.49 0.49 0.57 0.49 0.58 0.62 <![CDATA[Density d (g / cm 3 )]]> 2.59 2.59 2.59 2.59 2.58 Young's modulus E (GPa) 100.0 100.0 99.6 100.2 100.6 100.0 99.7 Devitation temperature TL (°C) 1297 1299 1317 1285 1293 1287 1291 T2.5 (°C) 1393 1392 1343 1405 1397 1401 1389 T3(°C) 1309 1307 1319 1319 1312 1315 1304

[0092] [Table 2]

[0093] Comparative example 1 2 3 4 5 6 7 8 <![CDATA[SiO2]]> 59.0 56.8 57.9 59.4 61.6 60.8 58.8 62.5 <![CDATA[Al2O3]]> 27.5 21.0 24.5 24.4 17.4 22.5 25.8 18.8 <![CDATA[B2O3]]> 0.1 1.1 0.1 0.1 0.0 1.7 1.1 0.06 MgO 12.1 14.9 14.2 12.8 19.3 14.4 10.2 16.9 CaO 0.9 3.7 0.9 0.9 1.0 0.1 2.7 0.9 <![CDATA[Li2O]]> 0.5 0.5 0.5 0.5 0.3 0.4 0.5 0.3 <![CDATA[Na2O]]> 0.0 0.0 0.0 0.0 0.5 0.1 1.0 0.5 <![CDATA[K2O]]> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 <![CDATA[Fe2O3]]> 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 <![CDATA[TiO2]]> 0.0 2.0 0.0 0.0 0.0 0.0 0.0 0.0 <![CDATA[ZrO2]]> 0.0 0.0 2.0 2.0 0.0 0.0 0.0 0.0 ZnO 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 <![CDATA[SiO2+TiO2+ZrO2]]> 59.4 58.8 57.9 61.4 61.6 60.8 58.8 62.5 <![CDATA[Acid resistance ΔW1]]> 0.16 0.24 0.12 0.07 0.12 0.30 0.06 <![CDATA[Alkali resistance ΔW2]]> 0.70 0.73 <![CDATA[Density d (g / cm 3 )]]> 2.61 Young's modulus E (GPa) 101.2 100.5 100.9 100.2 98.2 96 94 96.6 Devitation temperature TL (°C) >1380 >1380 1348 >1380 1327 1332 T2.5 (°C) 1424 1448 1362 1446 1414 T3(°C) 1338 1361 1282 1356 1323

[0094] According to the various embodiments, a Young's modulus of 97 GPa or higher, a ΔW1 of 0.1% or less, and a positive ΔT were achieved. On the other hand, in the comparative examples, not all of these characteristics could be satisfied.

[0095] As described above, this specification discloses the following technologies.

[0096] (Technology 1)

[0097] A glass composition for glass fiber, wherein,

[0098] It contains, expressed as a percentage by mass:

[0099]

[0100]

[0101] (Technology 2)

[0102] According to the glass composition of technique 1, wherein,

[0103] Expressed as a percentage by mass, the total content of SiO2, TiO2 and ZrO2 (SiO2+TiO2+ZrO2) is 60% or more.

[0104] (Technology 3)

[0105] According to the glass composition of technique 1 or technique 2, wherein,

[0106] Expressed as a percentage by mass, the total content of TiO2 and ZrO2 (TiO2+ZrO2) is 0.1% or more.

[0107] (Technology 4)

[0108] According to any one of techniques 1 to 3, wherein,

[0109] It does not actually contain Y2O3 or La2O3.

[0110] (Technology 5)

[0111] According to any one of techniques 1 to 4, wherein,

[0112] The Young's modulus is above 97 GPa.

[0113] (Technology 6)

[0114] According to any one of techniques 1 to 5, wherein,

[0115] Viscosity becomes 10 3 The value ΔT obtained by subtracting the devitrification temperature TL from the temperature T3 (dPa·s) is positive.

[0116] (Technology 7)

[0117] According to any one of techniques 1 to 6, wherein,

[0118] ΔW1 is less than 0.1% by mass.

[0119] Wherein, ΔW1 is the mass reduction rate of the glass composition after immersion in 80 mL of sulfuric acid with a specific gravity of 1.2 and a temperature of 99°C for 60 minutes, with the mass set to the same value in grams as the specific gravity of the glass composition.

[0120] (Technology 8)

[0121] A glass fiber comprising any one of the glass compositions described in techniques 1 to 7.

[0122] (Technology 9)

[0123] According to the glass fiber of technology 8, wherein,

[0124] It has a morphology that conforms to at least one of the following: bundled yarn, roving, yarn, cloth, chopped strands, glass wool, and abrasive fibers.

Claims

1. A glass composition for glass fibers, wherein, In terms of mass percentage, it includes: SiO2 59.5%~62.5%, Al2O3 19%~21.2% B2O3 0%~0.5%, MgO 16.5%~18%, CaO 0.5%~1.5%, Li2O 0%~1.0%, Na2O 0%~0.2%, K2O 0%~0.1%, TiO2 0%~5%, ZrO2 0%~5%, ZnO 0%~1.5%, F2 0%～0.1%。 It does not actually contain Y2O3, La2O3, or CeO2.

2. The glass composition according to claim 1, wherein, Expressed as a percentage by mass, the total content of SiO2, TiO2 and ZrO2 (SiO2+TiO2+ZrO2) is over 60%.

3. The glass composition according to claim 1, wherein, Expressed as a percentage by mass, the total content of TiO2 and ZrO2 (TiO2+ZrO2) is 0.1% or more.

4. The glass composition according to claim 1, wherein, The Young's modulus is above 97 GPa.

5. The glass composition according to claim 1, wherein, Viscosity becomes 10 3 The value of ΔT is obtained by subtracting the devitrification temperature TL from the temperature T3 (dPa·s), which is positive.

6. The glass composition according to claim 1, wherein, ΔW1 is less than 0.1% by mass. Wherein, ΔW1 is the mass reduction rate of the glass composition after immersion in 80 mL of sulfuric acid with a specific gravity of 1.2 and a temperature of 99°C for 60 minutes, with the mass set to the same value in grams as the specific gravity of the glass composition.

7. A glass fiber comprising the glass composition according to any one of claims 1 to 6.

8. The glass fiber according to claim 7, wherein, It has a morphology that conforms to at least one of the following: bundled yarn, roving, yarn, cloth, chopped strands, glass wool, and abrasive fibers.

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