WO2017033245A1 - ガラス繊維の製造方法 - Google Patents
ガラス繊維の製造方法 Download PDFInfo
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- WO2017033245A1 WO2017033245A1 PCT/JP2015/073630 JP2015073630W WO2017033245A1 WO 2017033245 A1 WO2017033245 A1 WO 2017033245A1 JP 2015073630 W JP2015073630 W JP 2015073630W WO 2017033245 A1 WO2017033245 A1 WO 2017033245A1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/075—Manufacture of non-optical fibres or filaments consisting of different sorts of glass or characterised by shape, e.g. undulated fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/42—Details of construction of furnace walls, e.g. to prevent corrosion; Use of materials for furnace walls
- C03B5/43—Use of materials for furnace walls, e.g. fire-bricks
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
- C03C3/087—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/02—External structure or shape details
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Definitions
- the present invention relates to a method for producing glass fiber.
- Glass fiber is prepared by melting a glass raw material prepared so as to have a glass composition having a desired composition in a melting furnace to form molten glass (a melt of glass composition), and several tens to thousands of the molten glass. It is discharged from a container (bushing) having a nozzle plate on which the nozzle tip is formed, wound at a high speed, cooled while being stretched, solidified into a fibrous form (hereinafter this operation is sometimes referred to as “spinning”) ).
- the bushing is made of a noble metal such as platinum.
- glass having a composition composed of SiO 2 , Al 2 O 3 , and MgO is known as one of the glasses forming the glass fiber.
- S glass glass fiber having high fiber strength and high fiber elastic modulus can be obtained as compared with general-purpose glass such as E glass, but in terms of 1000 poise temperature and liquidus temperature, glass fiber. There is a problem that spinning is not always easy.
- the 1000 poise temperature means a temperature at which the viscosity of the molten glass becomes 1000 poise (100 Pa ⁇ s), and the liquidus temperature first causes crystal precipitation when the temperature of the molten glass is lowered.
- temperature refers to temperature.
- glass fibers can be efficiently spun when the viscosity of the molten glass is about 1000 poise. Therefore, usually, spinning of glass fiber can be performed more easily and stably as the temperature range (working temperature range) between the 1000 poise temperature and the liquidus temperature is wider.
- S glass has an extremely close 1000 poise temperature and a liquidus temperature, and the working temperature range is narrow, so that the molten glass is easily crystallized (devitrified) even under the influence of a slight temperature drop. For this reason, in order to stably spin the S glass, it is necessary to precisely control the spinning conditions in the glass fiber manufacturing process.
- the content of SiO 2 is 57.0 to 63 with respect to the total amount. 0.0% by mass, Al 2 O 3 content is 19.0-23.0% by mass, MgO content is 10.0-15.0% by mass, and CaO content is 4.0-11.0%.
- the present applicant has proposed a glass composition having a composition that is mass% and that the total content of SiO 2 , Al 2 O 3 , MgO, and CaO is 99.5 mass% or more (Patent Document). 1).
- a molten glass obtained by melting a glass raw material prepared so as to be a glass composition having a composition in the above range can be spun at a 1000 poise temperature and a liquidus temperature. By doing this, it is possible to easily produce glass fibers having higher fiber strength and higher fiber elastic modulus than the general-purpose glass.
- a bushing having a circular nozzle tip is usually used.
- the temperature is controlled to be higher than the liquidus temperature of the molten glass.
- the molten glass discharged from the circular nozzle tip has a strong action of being rounded by its own surface tension, a glass fiber having a cross-sectional shape close to a perfect circle can be easily obtained.
- the viscosity of the molten glass is 200 poise (20 Pa ⁇ s) or less, the glass discharged from the nozzle tip becomes droplets and does not become fibers. For this reason, the bushing is controlled below a temperature at which the viscosity of the molten glass becomes 200 poise.
- a bushing having a flat nozzle tip is used.
- the bushing provided with the flat nozzle tip is controlled to a temperature that is higher than the liquidus temperature of the molten glass and has a viscosity of 1000 poise or more.
- the present invention eliminates such inconvenience, and can stably spin glass glass without mixing red crystals, and has higher fiber strength and fiber elastic modulus than general-purpose glass (E glass). It aims at providing the manufacturing method of the glass fiber which can obtain a fiber.
- the red crystal is melted in a large furnace with a monthly production of several hundred tons or more, and the molten glass as the obtained glass composition is discharged from a nozzle tip of a bushing to obtain a flat shape or the like. It has been found that this rarely occurs when glass fibers having an irregular cross section and glass fibers having a perfect circular cross section having a fiber diameter of 3 ⁇ m or more and less than 10 ⁇ m are produced.
- the large furnace is heated by, for example, an indirect flame heating method using a gas burner, and a chromium oxide brick having excellent glass corrosion resistance at high temperatures is used in a portion in contact with the molten glass.
- a chromium oxide brick having excellent glass corrosion resistance at high temperatures is used in a portion in contact with the molten glass.
- the present inventors have produced a glass fiber by spinning a molten glass obtained by melting a glass raw material prepared to be a specific glass composition. It has been found that the above disadvantage can be solved by including an additive capable of suppressing the generation of the red crystals in the glass composition, and the present invention has been achieved.
- the glass fiber manufacturing method of the present invention when melted, contains SiO 2 in the range of 57.0 to 62.0% by mass with respect to the total amount, and 15.0 to 20%.
- the glass composition includes B 2 O 3 , Li 2 O or B 2 O 3 and Li 2 O as an additive capable of suppressing generation of red crystals. .
- the glass composition is added to SiO 2 , Al 2 O 3 , MgO and CaO in the above-mentioned range, and further B 2 as an additive capable of suppressing the generation of the red crystals.
- B 2 an additive capable of suppressing the generation of the red crystals.
- the glass composition cannot improve the mechanical strength of the obtained glass fiber when the content of SiO 2 with respect to the total amount is less than 57.0% by mass. It becomes chemically unstable.
- the content of SiO 2 with respect to the total amount of the glass composition exceeds 62.0% by mass, the 1000 poise temperature and the liquidus temperature become high, making it difficult to produce glass fibers.
- the content of SiO 2 with respect to the total amount is preferably in the range of 57.2 to 60.5% by mass, and more preferably in the range of 57.5 to 59.5% by mass.
- the range of 58.0 to 59.3% by mass is more preferable, the range of 58.2 to 59.0% by mass is particularly preferable, and the range of 58.5 to 58.8% by mass is preferable.
- Most preferred. the said glass composition for glass fibers can acquire the effect that a wide working temperature range can be maintained, maintaining high fiber strength.
- the glass composition can not content of Al 2 O 3 with respect to the total amount to increase the fiber elastic modulus of the glass fiber obtained is less than 15.0 wt%, 20.0 wt% If it exceeds 1, the liquidus temperature becomes high and the working temperature range becomes narrow. On the other hand, when the content of Al 2 O 3 exceeds 20.0 mass%, red crystals are easily generated.
- the content of Al 2 O 3 is preferably in the range of 16.8 to 19.8% by mass and more preferably in the range of 18.0 to 19.5% by mass with respect to the total amount. More preferred is a range of 18.2 to 19.0% by mass.
- the said glass composition cannot make the fiber elastic modulus of the obtained glass fiber high that content of MgO with respect to the whole quantity is less than 7.5 mass%, and exceeds 12.0 mass%. Since the liquidus temperature is high, the working temperature range is narrowed. On the other hand, when the content of MgO exceeds 12.0% by mass, red crystals are easily generated.
- the content of MgO with respect to the total amount is preferably in the range of 8.3 to 11.8% by mass, more preferably in the range of 8.8 to 11.5% by mass, More preferably, it is in the range of 9.0 to 11.0% by mass.
- the content of CaO with respect to the total amount of the glass composition is less than 9.0% by mass, the liquidus temperature becomes high, so that the working temperature range is narrowed and red crystals are easily generated.
- the content of CaO exceeds 16.5% by mass, the fiber elastic modulus of the obtained glass fiber cannot be increased, and the linear expansion coefficient of the glass fiber increases.
- the glass composition preferably has a CaO content in the range of 9.9 to 14.4% by mass, more preferably in the range of 10.3 to 12.5% by mass, The range of 10.5 to 12.0% by mass is more preferable.
- the glass composition has a relatively high content of other impurity components when the total amount of SiO 2 , Al 2 O 3 , MgO and CaO is less than 98.0% by mass relative to the total amount of the glass composition. .
- the total amount of SiO 2 , Al 2 O 3 , MgO and CaO with respect to the total amount of the glass composition is preferably 98.0% by mass or more and less than 99.5% by mass, and 98.5% by mass or more and 99%. More preferably, it is less than 0.0 mass%.
- Main impurity components that the glass composition may contain are Na 2 O, K 2 O, and Fe 2 O 3 . These may be contained in a total amount of 0.1 to 2.0% by mass with respect to the total amount of the glass composition. In order to widen the working temperature range and increase the fiber strength and fiber elastic modulus of the glass fiber obtained, the total amount of Na 2 O, K 2 O and Fe 2 O 3 is based on the total amount of the glass composition. Therefore, it is preferable to be suppressed to 0.1 to 0.5% by mass.
- the glass fiber has a ratio of the major axis to the minor axis of the cross-sectional shape (major axis / minor axis) in the range of 2.0 to 6.0, or the cross-sectional area is a perfect circle.
- the glass fiber has a ratio of the major axis to the minor axis of the cross-sectional shape (major axis / minor axis) in the range of 2.0 to 6.0, and a fiber diameter of 10 to 10 when the cross-sectional area is converted to a perfect circle. It may be in the range of 30 ⁇ m.
- an elliptical shape (a shape having a semicircular shape attached to both ends of a rectangle or a shape similar thereto), an elliptical shape, a central portion in the longitudinal direction
- a constricted bowl shape can be mentioned, and since it is excellent in the fluidity
- the glass fiber manufacturing method of the present invention when the glass fiber has the irregular cross section, it is possible to stably manufacture the glass fiber by preventing red crystals from being mixed into the obtained glass fiber. be able to.
- the glass fiber manufacturing method of the present invention is also suitable when the glass fiber has a perfect circular cross section and the fiber diameter is in the range of 3 ⁇ m to less than 10 ⁇ m. According to the glass fiber manufacturing method of the present invention, red crystals are mixed into the obtained glass fiber even when the glass fiber has the perfect circular cross section and the fiber diameter is in the above range. This can be prevented and the glass fiber can be produced stably.
- a glass raw material prepared so as to be the glass composition is melted using a melting furnace in which a portion in contact with the molten glass is made of a brick containing chromium oxide. It can be suitably used in some cases. According to the method for producing glass fiber of the present invention, even when the glass composition is melted using the melting furnace in which the chromium oxide brick is used, red crystals are formed on the obtained glass fiber. It can prevent mixing and can manufacture glass fiber stably.
- the glass composition preferably contains an additive capable of suppressing the generation of red crystals in the range of 0.5 to 1.5% by mass with respect to the total amount.
- the content of SiO 2, Al 2 O 3, MgO and CaO to the total amount of the glass composition by a range described above, the amount of the above range Even when an additive capable of suppressing the generation of red crystals is added, glass fibers having higher fiber strength and higher fiber elastic modulus than general-purpose glass (E glass) can be produced.
- the content of the additive capable of suppressing the generation of the red crystals is less than 0.5% by mass with respect to the total amount, the red crystals are mixed into the obtained glass fiber. This may not be prevented, and if it exceeds 1.5% by mass, the physical properties of the obtained glass fiber may be impaired.
- the glass composition preferably contains an additive capable of suppressing the generation of the red crystals in a range of 0.6 to 1.4% by mass with respect to the total amount, and 0.7 to 1.3% by mass.
- the content is more preferably in the range, further preferably in the range of 0.8 to 1.2% by mass, and particularly preferably in the range of 0.9 to 1.1% by mass.
- the additive capable of suppressing the generation of red crystals is in such a range, and in the obtained glass fiber, the generation of red crystals can be suppressed while maintaining a high fiber elastic modulus. An effect can be obtained.
- B 2 O 3 Li 2 O content of the relative content (mass%) of ( The ratio of (mass%) (Li 2 O (mass%) / B 2 O 3 (mass%)) is preferably in the range of 0 to 1.0.
- the glass composition has a product of the content (mass%) of the additive capable of suppressing the generation of red crystals and the content (mass%) of CaO, and the content (mass%) of Al 2 O 3.
- ) ((Additive capable of suppressing generation of red crystals (mass%) ⁇ CaO (mass%)) / Al 2 O 3 (mass%)) is in the range of 0.25 to 1.00 Preferably there is.
- Al 2 O 3 content is 19.5% by mass or less
- (additive (mass%) ⁇ CaO (mass%) capable of suppressing the generation of red crystals) / Al 2 O 3 ( (Mass%) is more preferably in the range of 0.28 to 0.95.
- the ratio of the content (% by mass) of Li 2 O to the content (% by mass) of B 2 O 3 (Li 2 O ( Mass%) / B 2 O 3 (mass%)) is in the range of 0 to 1.0 and (additive (mass%) ⁇ CaO (mass%) capable of suppressing the generation of red crystals) / Al 2 O 3 (% by mass) is particularly preferably in the range of 0.28 to 0.64.
- the ratio of the product of the additive content (mass%) and CaO content (mass%) capable of suppressing the occurrence of red crystals to the content ratio (mass%) of Al 2 O 3 is as described above.
- the content of each component described above is measured by using an ICP emission spectroscopic analyzer for B or Li which is a light element, and wavelength dispersive X-ray fluorescence analysis for other elements. This can be done using an apparatus.
- glass batch mixed and mixed with glass raw materials
- glass fiber when organic matter is attached to the surface of glass fiber, or glass fiber is mainly contained in organic matter (resin)
- organic matter refin
- the mixture is kept at a temperature of 1550 ° C. for 6 hours and melted with stirring to obtain a homogeneous molten glass.
- the obtained molten glass is poured out on a carbon plate to produce a glass cullet, it is pulverized into powder.
- the glass powder is alkali-melted and decomposed.
- the glass powder is acid-dissolved, and then quantitatively analyzed using an ICP emission spectroscopic analyzer.
- Other elements are quantitatively analyzed using a wavelength dispersive X-ray fluorescence analyzer after glass powder is formed into a disk shape by a press.
- These quantitative analysis results are converted into oxides to calculate the content and total amount of each component, and the content of each component described above can be obtained from these numerical values.
- the additive capable of suppressing the generation of red crystals is added simultaneously with the preparation of the glass raw material.
- the glass composition preferably has a 1000 poise temperature in the range of 1300 to 1370 ° C. and a liquidus temperature in the range of 1200 to 1270 ° C.
- the glass composition is stable when the 1000 poise temperature is in the range of 1300 to 1370 ° C., the liquidus temperature is in the range of 1200 to 1270 ° C., and the working temperature range is 50 ° C. or more. It can be spun and is suitable for large-scale production of glass fibers with a monthly production of several hundred tons or more.
- the glass fiber produced from the glass composition preferably has a fiber elastic modulus of 80 GPa or more and a fiber strength of 4.0 GPa or more.
- a glass fiber having higher fiber strength and higher fiber elastic modulus than general-purpose glass (E glass) is obtained. Can do.
- crystallization in the glass obtained from the glass composition of Example 11 shows the presence or absence of precipitation of the red crystal
- crystallization in the glass obtained from the glass composition of the comparative example 2.
- the glass fiber manufacturing method of the present embodiment first, when melted, SiO 2 in the range of 57.0 to 62.0% by mass and the range of 15.0 to 20.0% by mass with respect to the total amount.
- a glass raw material so that the glass composition has a composition in which the total amount of SiO 2 , Al 2 O 3 , MgO and CaO is 98.0% by mass or more.
- the additive capable of suppressing the generation of red crystals (hereinafter abbreviated as red crystal suppressing additive) is either B 2 O 3 or Li 2 O alone, or B 2 O 3 and Li 2 O. Can be used.
- the glass composition having the above composition has a 1000 poise temperature in the range of 1300 to 1370 ° C. and a liquidus temperature in the range of 1200 to 1270 ° C.
- the glass batch is supplied to a melting furnace and melted in a temperature range of 1000 poise temperature or more, specifically in a temperature range of 1450 to 1550 ° C. Then, the molten glass melted at the above temperature is discharged from a nozzle tip of a bushing controlled at a predetermined temperature, cooled while being stretched by winding at high speed, and solidified to form glass fibers.
- the melting furnace is a large furnace with a monthly production of several hundred tons or more, for example, heated by an indirect flame heating method using a gas burner, and a chromium oxide brick with excellent glass corrosion resistance at high temperatures is used for the portion that contacts the molten glass Has been.
- the nozzle tip when manufacturing glass fibers having a deformed cross section such as a flat shape, has a ratio of the major axis to the minor axis (major axis / minor axis) of 2 to 10 on the nozzle plate on the bottom surface of the bushing.
- An opening (orifice hole) having a major axis of 1.0 to 10.0 mm and a minor axis of 0.5 to 2.0 mm, and a notch for rapidly cooling the molten glass that has passed through the opening A thing provided with cooling means, such as a projection part, can be used.
- the nozzle tip has, for example, a circular opening having a perfect circular cross section and an opening diameter of 0.5 to 1.5 mm when manufacturing glass fibers having a fiber diameter of 3 ⁇ m or more and less than 10 ⁇ m.
- the thing provided with a part can be used.
- the control temperature of the bushing is 1260 to 1370 ° C.
- the control temperature of the bushing is less than 1260 ° C.
- the viscosity of the molten glass is extremely high, and in addition, the glass-derived crystal (devitrification) is likely to precipitate because it approaches the liquidus temperature. It becomes difficult to manufacture the glass fiber itself.
- the control temperature of the bushing exceeds 1370 ° C.
- the viscosity of the molten glass becomes low and the surface tension tends to act, so that it is not possible to obtain a glass fiber having an irregular cross section such as the flat shape.
- the control temperature of the bushing is 1300 to 1470 ° C.
- the control temperature of the bushing is less than 1300 ° C.
- the viscosity of the molten glass becomes high, so that it is difficult to discharge from the thin nozzle tip, and the production of the glass fiber itself becomes difficult.
- the control temperature of the bushing exceeds 1470 ° C., the molten glass discharged from the nozzle tip becomes droplets and does not become fibers.
- the glass fiber having a deformed cross section such as the flat shape or the glass fiber having a perfect circular cross section and having a fiber diameter of 3 ⁇ m or more and less than 10 ⁇ m is made red as described above. Spinning can be performed stably without mixing of crystals.
- the glass fiber having the irregular cross section has a ratio of a major axis to a minor axis of the sectional shape (major axis / minor axis) in the range of 2.0 to 6.0, or a fiber when the sectional area is converted into a perfect circle.
- the diameter may be in the range of 10 to 30 ⁇ m.
- the glass fiber having an irregular cross section has a ratio of the major axis to the minor axis of the cross sectional shape in the range of 2.0 to 6.0, and a fiber diameter of 10 to 30 ⁇ m when the cross sectional area is converted into a perfect circle. It may be in the range.
- Example 1 In this example, first, when melted, 59.3 mass% of SiO 2 , 19.0 mass% of Al 2 O 3 , 10.0 mass% of MgO, and 11.0 mass of CaO with respect to the total amount. %, B 2 O 3 0.5% by mass, and other components Na 2 O, K 2 O, and Fe 2 O 3 0.2% by mass so as to become a melt (molten glass) of a glass composition.
- a glass batch was obtained by blending glass raw materials.
- the total amount of SiO 2 , Al 2 O 3 , MgO, and CaO is 99.3% by mass. Table 1 shows the composition of the glass composition obtained by melting the glass batch of this example.
- the glass batch was placed in a platinum crucible, and was melted while being stirred in an electric furnace at 1550 ° C. for 6 hours to obtain a homogeneous molten glass.
- the obtained molten glass was poured out on a carbon plate to produce a glass cullet.
- the 1000 poise temperature and the liquidus temperature of the molten glass were measured, and the working temperature range ( ⁇ T) was calculated.
- the 1000 poise temperature was continuously melted using a high temperature electric furnace equipped with a rotational viscometer (manufactured by Shibaura System Co., Ltd.) in a platinum crucible and changing the melting temperature using a rotating Brookfield viscometer. The viscosity of the molten glass was measured and the temperature corresponding to the rotational viscosity of 1000 poise was measured.
- a rotational viscometer manufactured by Shibaura System Co., Ltd.
- the liquidus temperature was determined by the following procedure. First, glass cullet is pulverized, 40 g of glass particles having a particle size of 0.5 to 1.5 mm are put into a platinum boat of 180 ⁇ 20 ⁇ 15 mm, and a tubular electric furnace provided with a temperature gradient of 1000 to 1400 ° C. for 8 hours. After heating as described above, the sample was taken out from the tubular electric furnace and observed with a polarizing microscope, and the position where the glass-derived crystal (devitrification) began to be deposited was specified. The temperature in the tubular electric furnace was measured using a B thermocouple, and the temperature at the position where the deposition started was determined as the liquidus temperature.
- the obtained glass cullet is placed in a small cylindrical platinum bushing having one circular nozzle tip at the bottom of the container, heated to a predetermined temperature and melted, and then the molten glass discharged from the nozzle tip is predetermined.
- the glass fiber was cooled and solidified while being stretched by winding at a speed of 5 mm to obtain a glass fiber having a perfect circular section and a fiber diameter of 13 ⁇ m.
- the relationship between the glass composition and the red crystal suppression component and the red crystal was verified by reproducing the rare occurrence of red crystals in glass fiber production. .
- Cr 2 O 3 is added to the glass composition.
- the amount of Cr 2 O 3 added is such that the portion in contact with the molten glass is This is based on the maximum concentration of Cr 2 O 3 contained in a glass block staying in a glass melting furnace made of chromium oxide brick. Since Cr 2 O 3 eluted from the chromium oxide brick over a long period of time is condensed in the glass lump, Cr 2 that can be contained in molten glass that passes through the melting furnace in a short time and is made into fiber is contained. The O 3 concentration does not exceed the maximum concentration of Cr 2 O 3 in the glass block.
- the glass composition of this example was to prepare a glass batch to contain 0.10 wt% chromium oxide (Cr 2 O 3).
- the glass batch containing the said chromium oxide was put into the crucible made from platinum, and it hold
- the obtained molten glass was poured out on a carbon plate to produce a glass cullet.
- the glass raw material when melted, is a glass composition melt (molten glass) containing 58.8% by mass of SiO 2 and 1.0% by mass of B 2 O 3 with respect to the total amount.
- a glass batch was obtained in exactly the same manner as in Example 1 except that was prepared.
- Table 1 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 1 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- a glass cullet containing chromium oxide was prepared in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the obtained glass cullet was made exactly the same as in Example 1.
- the temperature was lowered to 1250 ° C. and held for 12 hours.
- the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 3 when melted, the glass raw material is a glass composition melt (molten glass) containing 58.3% by mass of SiO 2 and 1.5% by mass of B 2 O 3 with respect to the total amount.
- a glass batch was obtained in exactly the same manner as in Example 1 except that was prepared.
- Table 1 shows the composition of the glass composition obtained by melting the glass batch of this example.
- a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- 1000 poise temperature, liquidus temperature, working temperature range of the glass composition of this example, fiber strength of the glass fiber (monofilament) obtained in this example, fiber The elastic modulus was measured. The results are shown in Table 1.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 4 when melted, a glass composition melt (melted) containing 59.2% by mass of SiO 2 , 0.6% by mass of Li 2 O, and no B 2 O 3 with respect to the total amount.
- a glass batch was obtained in exactly the same manner as in Example 1 except that the glass raw material was prepared so as to be glass.
- Table 1 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 1 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 5 when melted, a glass composition melt (melted) containing 58.8% by mass of SiO 2 , 1.0% by mass of Li 2 O and no B 2 O 3 with respect to the total amount.
- a glass batch was obtained in exactly the same manner as in Example 1 except that the glass raw material was prepared so as to be glass.
- Table 1 shows the composition of the glass composition obtained by melting the glass batch of this example.
- a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- 1000 poise temperature, liquidus temperature, working temperature range of the glass composition of this example, fiber strength of the glass fiber (monofilament) obtained in this example, fiber The elastic modulus was measured. The results are shown in Table 1.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 6 when melted, a glass composition melt containing 58.9% by mass of SiO 2 , 0.6% by mass of B 2 O 3 and 0.3% by mass of Li 2 O with respect to the total amount.
- a glass batch was obtained in exactly the same manner as in Example 1 except that the glass raw material was prepared so as to be (molten glass).
- the glass composition of the present embodiment based on the total amount, contains 0.9% by weight and B 2 O 3 and Li 2 O as a mixture.
- Table 1 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 1 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 7 when melted, 59.6% by mass of SiO 2 , 18.2% by mass of Al 2 O 3 , 9.2% by mass of MgO, 11.8% by mass of CaO with respect to the total amount, A melt of glass composition containing 0.9% by mass of B 2 O 3 , 0.1% by mass of Li 2 O and 0.2% by mass of Na 2 O, K 2 O and Fe 2 O 3 as other components A glass batch was obtained in exactly the same manner as in Example 1 except that the glass raw material was prepared so as to be (molten glass).
- the glass composition of the present embodiment based on the total amount, contains 1.0% by weight and B 2 O 3 and Li 2 O as a mixture. Table 1 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 1 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 8 In this example, when melted, 58.8% by mass of SiO 2 , 19.5% by mass of Al 2 O 3 , 9.0% by mass of MgO, 12.0% by mass of CaO with respect to the total amount, Glass so as to be a melt (molten glass) of a glass composition containing 0.5% by mass of B 2 O 3 and 0.2% by mass of Na 2 O, K 2 O and Fe 2 O 3 as other components. A glass batch was obtained in the same manner as in Example 1 except that the raw materials were prepared. Table 2 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 2 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 9 In this example, when melted, 58.8% by mass of SiO 2 , 19.0% by mass of Al 2 O 3 , 9.0% by mass of MgO, 12.0% by mass of CaO with respect to the total amount, Glass so as to be a melt (molten glass) of a glass composition containing 1.0% by mass of B 2 O 3 and 0.2% by mass of Na 2 O, K 2 O and Fe 2 O 3 as other components. A glass batch was obtained in the same manner as in Example 1 except that the raw materials were prepared. Table 2 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 2 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 10 when melted, 58.8% by mass of SiO 2 , 18.5% by mass of Al 2 O 3 , 9.0% by mass of MgO, 12.0% by mass of CaO with respect to the total amount, Glass so as to be a melt (molten glass) of a glass composition containing 1.5% by mass of B 2 O 3 and 0.2% by mass of Na 2 O, K 2 O and Fe 2 O 3 as other components.
- a glass batch was obtained in the same manner as in Example 1 except that the raw materials were prepared.
- Table 2 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 2 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 11 when melted, 62.0% by mass of SiO 2 , 16.0% by mass of Al 2 O 3 , 8.8% by mass of MgO, 12.0% by mass of CaO with respect to the total amount, Glass so as to be a melt (molten glass) of a glass composition containing 1.0% by mass of B 2 O 3 and 0.2% by mass of Na 2 O, K 2 O and Fe 2 O 3 as other components.
- a glass batch was obtained in the same manner as in Example 1 except that the raw materials were prepared.
- Table 2 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 2 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- the fiber strength and fiber elastic modulus of the glass fiber (monofilament) obtained in this example were measured. The results are shown in Table 2.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 12 when melted, 59.0% by mass of SiO 2 , 18.0% by mass of Al 2 O 3 , 8.0% by mass of MgO, 13.8% by mass of CaO with respect to the total amount, Glass so as to be a melt (molten glass) of a glass composition containing 1.0% by mass of B 2 O 3 and 0.2% by mass of Na 2 O, K 2 O and Fe 2 O 3 as other components.
- a glass batch was obtained in the same manner as in Example 1 except that the raw materials were prepared.
- Table 2 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 2 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- the fiber strength and fiber elastic modulus of the glass fiber (monofilament) obtained in this example were measured. The results are shown in Table 2.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 13 In this example, when melted, 58.3% by mass of SiO 2 , 18.0% by mass of Al 2 O 3 , 9.0% by mass of MgO, 13.5% by mass of CaO with respect to the total amount, Glass so as to be a melt (molten glass) of a glass composition containing 1.0% by mass of B 2 O 3 and 0.2% by mass of Na 2 O, K 2 O and Fe 2 O 3 as other components. A glass batch was obtained in the same manner as in Example 1 except that the raw materials were prepared. Table 2 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 2 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- the fiber strength and fiber elastic modulus of the glass fiber (monofilament) obtained in this example were measured. The results are shown in Table 2.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Example 14 In this example, when melted, 59.8% by mass of SiO 2 , 20.0% by mass of Al 2 O 3 , 8.0% by mass of MgO, 11.0% by mass of CaO with respect to the total amount, Glass so as to be a melt (molten glass) of a glass composition containing 1.0% by mass of B 2 O 3 and 0.2% by mass of Na 2 O, K 2 O and Fe 2 O 3 as other components. A glass batch was obtained in the same manner as in Example 1 except that the raw materials were prepared. Table 2 shows the composition of the glass composition obtained by melting the glass batch of this example.
- Example 2 a glass cullet was prepared in exactly the same manner as in Example 1 except that the glass batch of this example was used, and glass fibers were spun in exactly the same manner as in Example 1 except that the glass cullet was used.
- the fiber strength and fiber elastic modulus of the glass fiber (monofilament) obtained in this example were measured. The results are shown in Table 2.
- Example 2 a glass cullet containing chromium oxide was produced in exactly the same manner as in Example 1 except that the glass batch obtained in this example was used, and the glass cullet was made exactly the same as in Example 1 and made of platinum. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Comparative Example 1 In this comparative example, when melted, the glass raw material is prepared so as to become a melt (molten glass) of a glass composition containing 59.8% by mass of SiO 2 and not containing B 2 O 3 with respect to the total amount. A glass batch was obtained in exactly the same manner as in Example 1 except that. Table 3 shows the composition of the glass composition obtained by melting the glass batch of this comparative example.
- a glass cullet containing chromium oxide was prepared in exactly the same manner as in Example 1 except that the glass batch obtained in this comparative example was used. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Comparative Example 2 In this comparative example, a glass batch was obtained in exactly the same manner as in Example 2, except that Na 2 O was used instead of B 2 O 3 . Table 3 shows the composition of the glass composition obtained by melting the glass batch of this comparative example.
- a glass cullet containing chromium oxide was prepared in exactly the same manner as in Example 1 except that the glass batch obtained in this comparative example was used. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Comparative Example 3 In this comparative example, a glass batch was obtained in exactly the same manner as in Example 2, except that K 2 O was used instead of B 2 O 3 . Table 3 shows the composition of the glass composition obtained by melting the glass batch of this comparative example.
- a glass cullet containing chromium oxide was prepared in exactly the same manner as in Example 1 except that the glass batch obtained in this comparative example was used. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Comparative Example 4 In this comparative example, a glass batch was obtained in exactly the same manner as in Example 2, except that SrO was used instead of B 2 O 3 . Table 3 shows the composition of the glass composition obtained by melting the glass batch of this comparative example.
- a glass cullet containing chromium oxide was prepared in exactly the same manner as in Example 1 except that the glass batch obtained in this comparative example was used. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- Comparative Example 5 In this comparative example, a glass batch was obtained in exactly the same manner as in Example 2 except that Y 2 O 3 was used instead of B 2 O 3 . Table 3 shows the composition of the glass composition obtained by melting the glass batch of this comparative example.
- a glass cullet containing chromium oxide was prepared in exactly the same manner as in Example 1 except that the glass batch obtained in this comparative example was used. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- a glass cullet containing chromium oxide was prepared in exactly the same manner as in Example 1 except that the glass batch obtained in this comparative example was used. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- a glass cullet containing chromium oxide was prepared in exactly the same manner as in Example 1 except that the glass batch obtained in this comparative example was used. It was put into a boat, melted in an electric furnace at 1550 ° C. for 2 hours, then cooled to 1250 ° C. and held for 12 hours. Next, in exactly the same manner as in Example 1, the interface portion with the glass on the platinum surface was observed at a magnification of 200 times using a laser microscope to examine whether red crystals were precipitated. The results are shown in FIG.
- one of B 2 O 3 , Li 2 O, or a mixture of B 2 O 3 and Li 2 O is added to 0.5% of the total amount of the glass composition.
- it is contained in the range of ⁇ 1.5% by mass (Examples 1 to 7), it can be seen that no fine particles (red crystals) are generated at the interface with the glass on the platinum surface.
- the content of CaO is less than 9.0% by mass even when 1.0% by mass of B 2 O 3 is included in the total amount of the glass composition (Comparative Example 6). Or, when the content of Al 2 O 3 exceeds 20.0 mass% (Comparative Example 7), fine particles are generated at the interface portion with the glass on the platinum surface, and generation of red crystals is caused. It turns out that it cannot suppress.
- Example 15 the glass batch obtained in Example 1 was melted in a large melting furnace in which the portion in contact with the molten glass was made of chromium oxide bricks, and the obtained molten glass was adjusted to a temperature of 1300 ° C. It was discharged from the nozzle tip of the bushing.
- the nozzle tip has an oblong orifice hole.
- the obtained glass fiber having a deformed cross section did not contain red crystals, and could be spun for 8 hours or more without causing any spinning cutting.
- Example 16 the glass batch obtained in Example 1 was melted in a large melting furnace in which the portion in contact with the molten glass was made of chromium oxide bricks, and the obtained molten glass was adjusted to a temperature of 1350 ° C. It was discharged from the nozzle tip of the bushing.
- the nozzle tip has a circular orifice having a diameter of 1 mm.
- the obtained glass fiber having a circular cross-sectional shape and a fiber diameter of 5 ⁇ m did not contain red crystals and could be spun for 8 hours or more without being spun and cut.
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Abstract
Description
本実施例では、まず、溶融したときに、全量に対し、SiO2を59.3質量%、Al2O3を19.0質量%、MgOを10.0質量%、CaOを11.0質量%、B2O3を0.5質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合してガラスバッチを得た。本実施例のガラス組成物は、SiO2、Al2O3、MgO及びCaOの合計量が99.3質量%となっている。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表1に示す。
本実施例では、溶融したときに、全量に対し、SiO2を58.8質量%、B2O3を1.0質量%含むガラス組成物の溶融物(溶融ガラス)となるようにガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表1に示す。
本実施例では、溶融したときに、全量に対し、SiO2を58.3質量%、B2O3を1.5質量%含むガラス組成物の溶融物(溶融ガラス)となるようにガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表1に示す。
次に、本実施例のガラスバッチを用いた以外は実施例1と全く同一にしてガラスカレットを作製し、該ガラスカレットを用いた以外は実施例1と全く同一にしてガラス繊維を紡糸した。次に、実施例1と全く同一にして、本実施例のガラス組成物の1000ポイズ温度、液相温度、作業温度範囲と、本実施例で得られたガラス繊維(モノフィラメント)の繊維強度、繊維弾性率とを測定した。結果を表1に示す。
本実施例では、溶融したときに、全量に対し、SiO2を59.2質量%、Li2Oを0.6質量%含み、B2O3を全く含まないガラス組成物の溶融物(溶融ガラス)となるようにガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表1に示す。
本実施例では、溶融したときに、全量に対し、SiO2を58.8質量%、Li2Oを1.0質量%含み、B2O3を全く含まないガラス組成物の溶融物(溶融ガラス)となるようにガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表1に示す。
次に、本実施例のガラスバッチを用いた以外は実施例1と全く同一にしてガラスカレットを作製し、該ガラスカレットを用いた以外は実施例1と全く同一にしてガラス繊維を紡糸した。次に、実施例1と全く同一にして、本実施例のガラス組成物の1000ポイズ温度、液相温度、作業温度範囲と、本実施例で得られたガラス繊維(モノフィラメント)の繊維強度、繊維弾性率とを測定した。結果を表1に示す。
本実施例では、溶融したときに、全量に対し、SiO2を58.9質量%、B2O3を0.6質量%、Li2Oを0.3質量%含むガラス組成物の溶融物(溶融ガラス)となるようにガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラス組成物は、全量に対して、B2O3とLi2Oとをその混合物として0.9質量%含んでいる。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表1に示す。
次に、本実施例のガラスバッチを用いた以外は実施例1と全く同一にしてガラスカレットを作製し、該ガラスカレットを用いた以外は実施例1と全く同一にしてガラス繊維を紡糸した。次に、実施例1と全く同一にして、本実施例のガラス組成物の1000ポイズ温度、液相温度、作業温度範囲と、本実施例で得られたガラス繊維(モノフィラメント)の繊維強度、繊維弾性率とを測定した。結果を表1に示す。
本実施例では、溶融したときに、全量に対し、SiO2を59.6質量%、Al2O3を18.2質量%、MgOを9.2質量%、CaOを11.8質量%、B2O3を0.9質量%、Li2Oを0.1質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラス組成物は、全量に対して、B2O3とLi2Oとをその混合物として1.0質量%含んでいる。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表1に示す。
次に、本実施例のガラスバッチを用いた以外は実施例1と全く同一にしてガラスカレットを作製し、該ガラスカレットを用いた以外は実施例1と全く同一にしてガラス繊維を紡糸した。次に、実施例1と全く同一にして、本実施例のガラス組成物の1000ポイズ温度、液相温度、作業温度範囲と、本実施例で得られたガラス繊維(モノフィラメント)の繊維強度、繊維弾性率とを測定した。結果を表1に示す。
本実施例では、溶融したときに、全量に対し、SiO2を58.8質量%、Al2O3を19.5質量%、MgOを9.0質量%、CaOを12.0質量%、B2O3を0.5質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表2に示す。
本実施例では、溶融したときに、全量に対し、SiO2を58.8質量%、Al2O3を19.0質量%、MgOを9.0質量%、CaOを12.0質量%、B2O3を1.0質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表2に示す。
本実施例では、溶融したときに、全量に対し、SiO2を58.8質量%、Al2O3を18.5質量%、MgOを9.0質量%、CaOを12.0質量%、B2O3を1.5質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表2に示す。
本実施例では、溶融したときに、全量に対し、SiO2を62.0質量%、Al2O3を16.0質量%、MgOを8.8質量%、CaOを12.0質量%、B2O3を1.0質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表2に示す。
本実施例では、溶融したときに、全量に対し、SiO2を59.0質量%、Al2O3を18.0質量%、MgOを8.0質量%、CaOを13.8質量%、B2O3を1.0質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表2に示す。
本実施例では、溶融したときに、全量に対し、SiO2を58.3質量%、Al2O3を18.0質量%、MgOを9.0質量%、CaOを13.5質量%、B2O3を1.0質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表2に示す。
本実施例では、溶融したときに、全量に対し、SiO2を59.8質量%、Al2O3を20.0質量%、MgOを8.0質量%、CaOを11.0質量%、B2O3を1.0質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本実施例のガラスバッチを溶融して得られたガラス組成物の組成を表2に示す。
本比較例では、溶融したときに、全量に対し、SiO2を59.8質量%含み、B2O3を全く含まないガラス組成物の溶融物(溶融ガラス)となるようにガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本比較例のガラスバッチを溶融して得られたガラス組成物の組成を表3に示す。
本比較例では、B2O3に代えてNa2Oを用いた以外は、実施例2と全く同一にしてガラスバッチを得た。本比較例のガラスバッチを溶融して得られたガラス組成物の組成を表3に示す。
本比較例では、B2O3に代えてK2Oを用いた以外は、実施例2と全く同一にしてガラスバッチを得た。本比較例のガラスバッチを溶融して得られたガラス組成物の組成を表3に示す。
本比較例では、B2O3に代えてSrOを用いた以外は、実施例2と全く同一にしてガラスバッチを得た。本比較例のガラスバッチを溶融して得られたガラス組成物の組成を表3に示す。
本比較例では、B2O3に代えてY2O3を用いた以外は、実施例2と全く同一にしてガラスバッチを得た。本比較例のガラスバッチを溶融して得られたガラス組成物の組成を表3に示す。
本比較例では、溶融したときに、全量に対し、SiO2を61.0質量%、Al2O3を20.0質量%、MgOを12.0質量%、CaOを5.8質量%、B2O3を1.0質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本比較例のガラスバッチを溶融して得られたガラス組成物の組成を表3に示す。
本比較例では、溶融したときに、全量に対し、SiO2を57.1質量%、Al2O3を20.7質量%、MgOを12.0質量%、CaOを9.0質量%、B2O3を1.0質量%、その他の成分としてNa2O、K2O及びFe2O3を0.2質量%含むガラス組成物の溶融物(溶融ガラス)となるように、ガラス原料を調合した以外は、実施例1と全く同一にしてガラスバッチを得た。本比較例のガラスバッチを溶融して得られたガラス組成物の組成を表3に示す。
本実施例では、実施例1で得られたガラスバッチを、溶融ガラスに接触する部分が酸化クロムレンガからなる大型溶融炉で溶融し、得られた溶融ガラスを、1300℃の温度に調整されたブッシングのノズルチップから吐出させた。前記ノズルチップは長円形状のオリフィス孔を有する。
本実施例では、実施例1で得られたガラスバッチを、溶融ガラスに接触する部分が酸化クロムレンガからなる大型溶融炉で溶融し、得られた溶融ガラスを、1350℃の温度に調整されたブッシングのノズルチップから吐出させた。前記ノズルチップは直径1mmの円形状のオリフィス孔を有する。
Claims (9)
- 溶融したときに、全量に対し、57.0~62.0質量%の範囲のSiO2と、15.0~20.0質量%の範囲のAl2O3と、7.5~12.0質量%の範囲のMgOと、9.0~16.5質量%の範囲のCaOとを含み、且つ、SiO2、Al2O3、MgO及びCaOの合計量が98.0質量%以上であるガラス組成物となるように調合されたガラス原料を溶融して得られた溶融ガラスをノズルチップから吐出してガラス繊維を形成するときに、該ガラス組成物は、赤色の結晶の発生を抑制可能な添加物として、B2O3、Li2O又はB2O3とLi2Oとを含むことを特徴とするガラス繊維の製造方法。
- 請求項1記載のガラス繊維の製造方法において、前記ガラス繊維は、断面形状の短径に対する長径の比(長径/短径)が2.0~6.0の範囲にある異形断面を備えることを特徴とするガラス繊維の製造方法。
- 請求項1又は請求項2記載のガラス繊維の製造方法において、前記ガラス繊維は、断面積を真円に換算したときの繊維径が10~30μmの範囲にある異形断面を備えることを特徴とするガラス繊維の製造方法。
- 請求項1記載のガラス繊維の製造方法において、前記ガラス繊維は、真円状の円形断面を備え、繊維径が3μm以上10μm未満の範囲にあることを特徴とするガラス繊維の製造方法。
- 請求項1~請求項4のいずれか1項記載のガラス繊維の製造方法において、前記ガラス組成物となるように調合されたガラス原料は、前記溶融ガラスに接触する部分が酸化クロムを含むレンガからなる溶融炉を用いて溶融されることを特徴とするガラス繊維の製造方法。
- 請求項1~請求項5のいずれか1項記載のガラス繊維の製造方法において、前記ガラス組成物は、赤色の結晶の発生を抑制可能な添加物として、全量に対し0.5~1.5質量%のB2O3を含むことを特徴とするガラス繊維の製造方法。
- 請求項1~請求項5のいずれか1項記載のガラス繊維の製造方法において、前記ガラス組成物は、赤色の結晶の発生を抑制可能な添加物として、全量に対し0.5~1.5質量%のLi2Oを含むことを特徴とするガラス繊維の製造方法。
- 請求項1~請求項5のいずれか1項記載のガラス繊維の製造方法において、前記ガラス組成物は、赤色の結晶の発生を抑制可能な添加物として、全量に対し0.5~1.5質量%のB2O3とLi2Oとを含むことを特徴とするガラス繊維の製造方法。
- 請求項1~請求項8のいずれか1項記載のガラス繊維の製造方法において、前記ガラス組成物は、1000ポイズ温度が1300~1370℃の範囲の温度であり、液相温度が1200~1270℃の範囲の温度であり、作業温度範囲が50℃以上であることを特徴とするガラス繊維の製造方法。
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