Classifications

• • 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
  • C03C13/04—Fibre optics, e.g. core and clad fibre compositions
  • C03C13/045—Silica-containing oxide glass compositions
  • C03C13/046—Multicomponent glass compositions
• • 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
  • C03C3/097—Glass compositions containing silica with 40% to 90% silica, by weight containing phosphorus, niobium or tantalum
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/06—Fibrous reinforcements only
  • B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
  • B29C70/12—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of short length, e.g. in the form of a mat
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
  • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
  • B29C70/28—Shaping operations therefor
• • 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
  • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
  • C03C25/10—Coating
  • C03C25/24—Coatings containing organic materials
  • C03C25/26—Macromolecular compounds or prepolymers
• • 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
  • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
  • C03C25/10—Coating
  • C03C25/24—Coatings containing organic materials
  • C03C25/40—Organo-silicon compounds
• • 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
  • C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
  • C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
  • C03C3/115—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron
  • C03C3/118—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron containing aluminium
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K7/00—Use of ingredients characterised by shape
  • C08K7/02—Fibres or whiskers
  • C08K7/04—Fibres or whiskers inorganic
  • C08K7/14—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
  • C03C2213/00—Glass fibres or filaments

Definitions

• the present invention relates to glass compositions for glass fibers, glass fibers, and glass fiber-reinforced resin molded articles.
• glass fiber reinforced resin molded products using E glass fiber have been used as a metal substitute material for automobile parts, etc., because they contribute to the reduction of environmental load by improving fuel efficiency due to weight reduction. Widely used.
• the inventors of the present invention melted glass raw materials containing recovered glass fibers to form molten glass, and spun the molten glass to form glass fibers, thereby eliminating the deterioration of workability. found to be
• the inventors of the present invention have extensively studied the above-mentioned inconveniences, and found that substances (especially inorganic substances) derived from additives other than the E-glass fibers contained in the glass fiber-reinforced resin molded product remain on the surface of the recovered glass fibers. Therefore, when glass fibers are produced using a glass composition containing recovered glass fibers as a glass raw material, the composition of the glass fibers varies due to substances derived from the additives, and as a result, the fiber diameter of the glass fibers varies. It was found that variations occur.
• the present inventors found that the same substance as the substance derived from the additive can be contained as an impurity in the glass fiber mineral material used as the raw material for glass, and that the impurity It has been found that when a glass fiber mineral material containing the same substance as that derived from an additive is used to prepare a glass raw material, the fiber diameter of the glass fiber produced from the glass raw material also varies.
• the present invention provides a glass composition for glass fiber, which is capable of suppressing variation in the fiber diameter of the glass fiber even under the influence of the same substance as the substance derived from the additive.
• An object is to provide a glass composition.
• the glass composition for glass fiber of the present invention contains SiO 2 in the range of 45.60 to 59.00% by mass and 10.00 to Al 2 O 3 in the range of 16.00% by weight; CaO in the range of 17.00-25.00% by weight; TiO 2 in the range of 0.01-9.50% by weight; P 2 O 5 in the range of 0.00 wt.%, ZnO in the range of 0.00 to 9.50 wt.%, and SO 3 in the range of 0.00 to 2.00 wt.
• the content SO satisfies the following formula (1). 15.0 ⁇ (SI/C) 2 ⁇ (A/T) ⁇ P/(SO+Z) ⁇ 1/4 ⁇ 690.1 (1)
• the SiO 2 content, the Al 2 O 3 content, the CaO content, the TiO 2 content, and the P 2 O 5 content , the content of ZnO, and the content of SO 3 are each within the above ranges with respect to the total amount of the glass composition for glass fiber, and the content of SiO 2 SI and the content of Al 2 O 3 are within the above ranges.
• A, the CaO content C , the TiO2 content T, the P2O5 content P, the ZnO content Z, and the SO3 content SO satisfy the above formula (1).
• the glass composition for glass fiber of the present invention By filling the glass composition for glass fiber of the present invention, even if it is affected by the same substance derived from the additive that remains on the surface of the glass fiber recovered from the glass fiber reinforced resin molded product containing E glass fiber. In the case where the glass fiber made of the material has a circular cross section, the variation in fiber diameter can be suppressed.
• the strength, thermal expansion coefficient, elastic modulus and refractive index of the glass fiber comprising the glass composition for glass fiber are made equivalent to those of ordinary E-glass fiber. can be done.
• the coefficient of thermal expansion and the modulus of elasticity can be measured by the method described later.
• ordinary E-glass fibers are glass fibers with an E-glass composition.
• the E-glass composition includes SiO 2 in the range of 52.0 to 56.0% by mass and Al 2 O 3 in the range of 12.0 to 16.0% by mass with respect to the total amount of glass fibers, and 20% in total.
• the composition contains MgO and CaO in the range of 0 to 25.0 mass % and B 2 O 3 in the range of 5.0 to 10.0 mass %.
• the glass composition for glass fiber of the present invention comprises the SiO 2 content SI, the Al 2 O 3 content A, the CaO content C, the TiO 2 content T, and the P 2 O 5
• the content P, the ZnO content Z, and the SO3 content SO preferably satisfy the following formula (2), more preferably satisfy the following formula ( 3 ), and the following formula (4): is more preferably satisfied.
• the glass composition for glass fiber of the present invention comprises the SiO 2 content SI, the Al 2 O 3 content A, the CaO content C, the TiO 2 content T, and the P 2 O 5
• the content P, the content Z of ZnO, and the content SO of SO 3 satisfy the above formula (2), the variation in the fiber diameter is further suppressed when the glass fiber has a circular cross section. be able to.
• the SI, A, C, T, P, Z and SO satisfy the above formula (3), and when the glass fiber has a circular cross section, the fiber
• the fiber In addition to being able to further suppress variation in diameter, when the glass fiber has a flat cross section, suppression of variation in the ratio of the major axis to the minor axis (major axis / minor axis, hereinafter sometimes referred to as the irregular shape ratio) can do.
• the SI, A, C, T, P, Z and SO satisfy the formula (4), the glass fiber has a circular cross section.
• the thermal expansion coefficient of the glass fiber can be reduced to that of ordinary E glass fiber. It can be within ⁇ 3% of the coefficient of thermal expansion.
• the thermal expansion coefficient of ordinary E-glass fiber is 5.6 ppm/°C.
• the glass fiber of the present invention is characterized by comprising any one of the glass compositions for glass fibers described above.
• the glass fiber reinforced resin molded article of the present invention is characterized by containing the glass fiber of the present invention.
• the glass composition for glass fiber of the present embodiment contains SiO 2 in the range of 45.60 to 59.00% by mass and SiO 2 in the range of 10.00 to 16.00% by mass relative to the total amount of the glass composition for glass fiber.
• SiO 2 in the range of 45.60 to 59.00% by mass and SiO 2 in the range of 10.00 to 16.00% by mass relative to the total amount of the glass composition for glass fiber.
• Al 2 O 3 CaO in the range of 17.00-25.00% by weight, TiO 2 in the range of 0.01-9.50% by weight, and P 2 O 5 , ZnO in the range of 0.00 to 9.50% by weight, and SO 3 in the range of 0.00 to 2.00% by weight, for a total ZnO and SO 3 in the range and Na 2 O, K 2 O and Li 2 O in the range of 0.00 to 2.00 mass % in total, the content of SiO 2 SI, the Al 2 O
• the glass composition for glass fibers of the present embodiment has a SiO 2 content of less than 45.60% by mass with respect to the total amount of the glass composition for glass fibers, and the glass obtained from the glass composition for glass fibers is The mechanical strength of the fiber is greatly reduced, and the function of the glass fiber as a reinforcing material in the glass fiber reinforced resin molded article is impaired. In addition, the glass fibers tend to deteriorate when placed in an acidic environment. On the other hand, if the content of SiO2 is more than 59.00% by mass with respect to the total amount of the glass composition for glass fiber, the viscosity at high temperatures increases, so the temperature for melting the glass raw material increases, and the manufacturing cost increases. From the point of view, it becomes unsuitable for industrial glass fiber production.
• the content of SiO 2 is preferably in the range of 47.60 to 57.90% by mass, more preferably , in the range of 48.60 to 56.90% by mass, more preferably in the range of 49.60 to 56.40% by mass, and particularly preferably in the range of 50.60 to 55.90% by mass. , most preferably in the range of 51.60 to 55.40% by weight.
• the glass composition for glass fiber of the present embodiment is likely to devitrify.
• the content of Al 2 O 3 is more than 16.00% by mass with respect to the total amount of the glass composition for glass fiber, the viscosity at high temperature increases, so the temperature for melting the glass raw material increases, resulting in production failure. From the point of view of cost, it becomes unsuitable for industrial glass fiber production.
• the content of Al 2 O 3 is preferably in the range of 10.60 to 15.40% by mass with respect to the total amount of the glass composition for glass fiber. It is preferably in the range of 10.10 to 15.10% by mass, more preferably in the range of 11.10 to 14.90% by mass, and particularly preferably in the range of 11.90 to 14.70% by mass. and most preferably in the range of 12.40 to 14.40% by mass.
• the content of CaO when the content of CaO is less than 17.0% by mass with respect to the total amount of the glass composition for glass fiber, the viscosity of the glass at high temperature increases, so that it melts. sexuality worsens.
• the CaO content exceeds 25.00% by mass with respect to the total amount of the glass composition for glass fiber, devitrified substances are likely to be generated in the bushing, causing breakage during spinning, It may cause glass fibers containing devitrification substances.
• the glass composition for glass fibers of the present embodiment preferably has a CaO content in the range of 18.10 to 24.40% by mass with respect to the total amount of the glass composition for glass fibers, and more preferably, 19.10 to 23.90% by mass, more preferably 19.60 to 23.40% by mass, particularly preferably 20.10 to 23.10% by mass, Most preferably, it ranges from 20.60 to 22.90% by weight.
• the content of TiO 2 in the glass composition for glass fiber of the present embodiment is less than 0.01% by mass with respect to the total amount of the glass composition for glass fiber, the viscosity at high temperature increases. The temperature for melting becomes high, and from the viewpoint of production cost, it is not suitable for industrial glass fiber production.
• the content of TiO 2 is more than 9.50% by mass with respect to the total amount of the glass composition for glass fiber, the elastic modulus of the glass composition for glass fiber increases, and the standard E glass It deviates significantly from the elastic modulus.
• the liquidus temperature of the glass composition for glass fibers is significantly increased, it becomes impossible to stably produce glass fibers.
• the glass is colored, which deviates significantly from the refractive index of standard E-glass.
• the content of TiO 2 is preferably in the range of 0.10 to 4.90% by mass, more preferably , in the range of 0.20 to 3.90% by mass, more preferably in the range of 0.30 to 2.40% by mass, and particularly preferably in the range of 0.50 to 1.40% by mass. , most preferably in the range of 0.60 to 1.10% by weight.
• the content of P 2 O 5 is more than 7.00% by mass with respect to the total amount of the glass composition for glass fiber, and the liquid phase of the glass composition for glass fiber Due to the significant increase in temperature, stable glass fiber production is no longer possible.
• the content of P 2 O 5 is preferably in the range of 0.20 to 4.90% by mass with respect to the total amount of the glass composition for glass fiber. It is preferably in the range of 0.30 to 2.90% by mass, more preferably in the range of 0.40 to 1.90% by mass, and particularly preferably in the range of 0.50 to 1.40% by mass. and most preferably in the range of 0.70 to 1.20 mass %.
• the liquidus temperature of the glass composition for glass composition is greatly increased. , making it impossible to produce stable glass fibers.
• the deviation from the elastic modulus and refractive index of normal E-glass becomes large.
• the content of ZnO is preferably in the range of 0.20 to 4.90% by mass with respect to the total amount of the glass composition for glass fiber, and more preferably, 0.30 to 2.90% by mass, more preferably 0.40 to 1.90% by mass, particularly preferably 0.50 to 1.40% by mass, Most preferably, it ranges from 0.70 to 1.20% by weight.
• the reboiling bubbles are bubbles that are reboiled due to a decrease in the solubility of gas dissolved in the molten glass due to an increase in temperature of the molten glass or the like.
• a hollow fiber is a glass fiber that is obtained by spinning molten glass containing air bubbles and has cavities inside due to the air bubbles. The presence of cavities inside the glass fiber causes a decrease in the strength of the glass fiber.
• the glass composition for glass fiber of the present embodiment preferably has a SO 3 content in the range of 0.01 to 1.40% by mass, more preferably , in the range of 0.05 to 0.90% by mass, more preferably in the range of 0.10 to 0.40% by mass.
• the glass composition for glass fibers of the present embodiment if the total content of ZnO and SO3 is less than 0.01% by mass with respect to the total amount of the glass composition for glass fibers, the clarification of the glass becomes insufficient. , bubbles are likely to be contained in the glass fibers, and the possibility of cutting the glass fibers due to the bubbles increases, thereby deteriorating productivity.
• the total content of ZnO and SO3 is more than 11.50% by mass with respect to the total amount of the glass composition for glass fiber, spinning of the glass fiber tends to occur while unmelted components remain. , the unmelted component causes glass fiber cutting and deteriorates productivity.
• the total content of ZnO and SO3 with respect to the total amount of the glass composition for glass fiber is preferably in the range of 0.10 to 3.90% by mass. Yes, more preferably in the range of 0.40 to 2.40% by mass, still more preferably in the range of 0.60 to 2.20% by mass, particularly preferably 0.80 to 1.90% by mass %, most preferably in the range of 1.10 to 1.60 mass %.
• P 2 O 5 , ZnO, SO 3 , and TiO 2 are impurities contained in the glass fiber mineral material used as the glass raw material, and are added to the glass raw material when the glass is melted. Due to the fining agent used. Further, when part of the glass raw material contains glass fiber recovered from a glass fiber reinforced resin molded product containing E glass fiber, the additive contained in the glass fiber reinforced resin molded product and remaining on the surface of the glass fiber can be attributed
• examples of the resin used for the glass fiber reinforced resin molded product include resins, particularly thermoplastic resins, for forming the glass fiber reinforced resin molded product of the present embodiment, which will be described later.
• the additives include flame retardants (e.g., phosphorus-based flame retardants, inorganic flame retardants), coloring agents (e.g., titanium oxide, zinc oxide, zinc sulfide, carbon black), antioxidants (e.g., sulfur-based antioxidants, phosphorus antioxidants), plasticizers (e.g. phosphate plasticizers), fillers (e.g. talc, calcium carbonate, aluminum hydroxide), ultraviolet absorbers, antistatic agents, modifiers, etc. can be mentioned.
• flame retardants e.g., phosphorus-based flame retardants, inorganic flame retardants
• coloring agents e.g., titanium oxide, zinc oxide, zinc sulfide, carbon black
• antioxidants e.g., sulfur-based antioxidants, phosphorus antioxidants
• plasticizers e.g. phosphate plasticizers
• fillers e.g. talc, calcium carbonate, aluminum hydroxide
• ultraviolet absorbers e.g. talc, calcium carbonate, aluminum hydro
• the total content of Na 2 O, K 2 O and Li 2 O is more than 2.00% by mass with respect to the total amount of the glass composition for glass fibers.
• the total content of Na 2 O, K 2 O and Li 2 O with respect to the total amount of the glass composition for glass fiber is preferably 0.11 to 0. .40% by mass, more preferably 0.21 to 1.20% by mass, still more preferably 0.31 to 0.90% by mass, particularly preferably 0 0.41 to 0.79% by weight, most preferably 0.51 to 0.59% by weight.
• the glass composition for glass fiber of the present embodiment contains B 2 O 3 in the range of 0.00 to 8.00% by mass and 0.00 to 3.00 It may contain MgO in the range of wt.%, Fe 2 O 3 in the range of 0.00 to 2.00 wt.%, and F 2 in the range of 0.00 to 2.00 wt.%.
• the content of B 2 O 3 is preferably in the range of 2.60 to 7.40% by mass with respect to the total amount of the glass composition for glass fiber. It is preferably in the range of 3.10 to 6.90% by mass, more preferably in the range of 3.60 to 6.70% by mass, and particularly preferably in the range of 4.10 to 6.70% by mass. is particularly preferably in the range of 4.60 to 6.40% by mass, particularly preferably in the range of 5.10 to 6.40% by mass, most preferably in the range of 5.60 to 6.40% by mass. It is in the range of 40% by mass.
• the content of MgO is preferably in the range of 0.30 to 2.40% by mass with respect to the total amount of the glass composition for glass fiber, and more preferably, 0.60 to 1.90% by mass, more preferably 0.70 to 1.40% by mass, particularly preferably 0.80 to 1.20% by mass, Most preferably, it ranges from 0.90 to 1.00 mass %.
• the content of Fe 2 O 3 is preferably in the range of 0.10 to 0.90% by mass with respect to the total amount of the glass composition for glass fiber. Preferably, it is in the range of 0.10 to 0.40% by mass.
• the content of F2 is preferably in the range of 0.10 to 1.90% by mass, more preferably , in the range of 0.10 to 0.90% by mass.
• the glass composition for glass fiber of the present embodiment may contain ZrO 2 , Cr 2 O 3 and SnO 2 .
• the glass composition for glass fibers of the present embodiment preferably has a ZrO 2 content of less than 0.50% by mass, more preferably 0.5% by mass, based on the total amount of the glass composition for glass fibers. less than 40% by mass, more preferably less than 0.20% by mass, particularly preferably less than 0.10% by mass, most preferably less than 0.05% by mass Range.
• the glass composition for glass fibers of the present embodiment preferably has a Cr 2 O 3 content of less than 0.10% by mass with respect to the total amount of the glass composition for glass fibers, and more preferably, It is in the range of less than 0.05% by mass.
• the glass fiber made of the glass composition for glass fiber of the present embodiment has a Cr 2 O 3 content in the above range, when it is formed into a molded article such as a composite material, it has uneven color due to coloring of the glass, color tone change, Occurrence of appearance defects can be suppressed.
• the SnO 2 content is preferably in the range of less than 1.00% by mass, more preferably 0.50% by mass, based on the total amount of the glass composition for glass fiber. less than 0.40% by mass, more preferably less than 0.40% by mass, particularly preferably less than 0.20% by mass, and most preferably less than 0.10% by mass. range, most preferably less than 0.05% by weight.
• the glass composition for glass fiber of the present embodiment contains Ba, Sr, Co, Ni, Cu, Mo, W, Ce, Y, La, Bi, Gd, Pr, Sc, or , and Yb in a total amount of less than 1.00% by mass relative to the total amount of the glass composition for glass fiber.
• the glass composition for glass fiber of the present embodiment contains, as impurities, BaO, SrO, CoO, NiO, CuO , MoO3 , WO3 , CeO2 , Y2O3, La2O3 , Bi2O3 ,
• the content is independently preferably less than 0.50% by mass, more preferably The range is less than 0.40% by mass, more preferably less than 0.20% by mass, particularly preferably less than 0.10% by mass, and most preferably 0.05% by mass. %, most preferably less than 0.01% by weight.
• the glass composition for glass fiber of the present embodiment is obtained by mixing a glass raw material containing a glass fiber mineral material composed of a plurality of types of ores or materials refined from ores (also referred to as ore-derived refined materials), It is homogenized by melting or the like.
• the glass raw material may contain glass fibers (recovered glass fibers) recovered from glass fiber reinforced resin moldings containing E-glass fibers.
• the glass composition for glass fiber of the present embodiment is a homogenized glass raw material containing glass fiber recovered from a glass fiber reinforced resin molded product containing E glass fiber.
• the glass fiber mineral raw material is selected from the type of ore or ore-derived refined material so as to have a desired composition based on the components contained in the glass fiber mineral raw material, the content of each component, and the amount of volatilization of each component during the melting process. , and the content ratio of each ore or ore-derived refined material is determined.
• the glass fiber mineral raw material and the recovered glass fiber contain the components contained in the glass fiber mineral raw material and the content of each component
• the type of ore or ore-derived refined material, each ore or ore-derived material, and each ore or ore-derived A content ratio of the refined material and a content ratio of the glass fiber mineral raw material and the recovered glass fiber are determined.
• Examples of the ore include silica sand, feldspar, clay, and limestone.
• Examples of the mineral-derived refined material include silica powder, dolomite, talc, clay, alumina, soda ash, and the like.
• the glass composition for glass fiber of the present embodiment comprises the SiO 2 content SI, the Al 2 O 3 content A, the CaO content C, the TiO 2 content T, and the P 2 O 5
• the content P of , the content Z of ZnO, and the content SO of SO 3 satisfy the following formula (1), preferably the following formula (2), and the following formula (3) is more preferable, and it is particularly preferable to satisfy the following formula (4).
• the SI, A, C, T, P, Z and SO are closer to those of ordinary E-glass fiber, the SI, A, C, T, P, Z and SO are , the following formula (5) is particularly preferably satisfied, the following formula (6) is particularly preferably satisfied, and the following formula (7) is most preferably satisfied.
• the content of each of the components described above is measured using an ICP emission spectrometer for Li, which is a light element, and wavelength dispersive X-ray fluorescence analysis for other elements. It can be performed using an apparatus.
• ICP emission spectrometer for Li which is a light element, and wavelength dispersive X-ray fluorescence analysis for other elements. It can be performed using an apparatus.
• the glass composition for glass fiber is placed in a platinum crucible, held at a temperature of 1450° C. for 6 hours in an electric furnace, and melted with stirring to obtain homogeneous molten glass.
• the obtained molten glass is poured from the platinum crucible onto a carbon plate to prepare glass cullet, and then the glass cullet is pulverized into powder to obtain glass powder.
• Li which is a light element, is subjected to quantitative analysis using an ICP emission spectrometer after thermally decomposing the glass powder with an acid.
• Other elements are quantitatively analyzed using a wavelength dispersive X-ray fluorescence spectrometer after molding the glass powder into a disc shape with a press. These quantitative analysis results are converted into oxides to calculate the content and total amount of each component, and the content (% by mass) of each component described above can be obtained from these numerical values.
• the glass fiber of the present embodiment is preferably a long glass fiber made of any of the glass compositions for glass fiber and having a length of at least 1000 m or more at the time of production.
• the glass fiber of the present embodiment is obtained by melting and homogenizing glass raw materials prepared so as to have the composition of the glass composition for glass fiber of the present embodiment to obtain molten glass, and spinning the molten glass to obtain glass fiber. It can be manufactured by Here, from the viewpoint of reducing the environmental load, the glass fiber of the present embodiment is obtained by melting and homogenizing the glass raw material containing the glass fiber recovered from the glass fiber reinforced resin molded product containing the E glass fiber to obtain molten glass. , preferably produced by spinning the molten glass.
• the glass raw material prepared as described above is supplied to the glass melting furnace, and the temperature range is 1000 poise temperature or higher, specifically the range of 1200 ° C. to 1500 ° C. to melt at a temperature of Then, the molten glass melted at the above temperature is discharged from 1 to 8000 nozzle tips or holes controlled to a predetermined temperature, and is wound at high speed to cool while stretching and solidifying the glass fiber. can be formed.
• the glass single fibers (glass filaments) discharged from one nozzle tip or hole, cooled and solidified usually have a perfect circular cross-sectional shape.
• the nozzle tip has a non-circular shape and has projections or cutouts for quenching the molten glass, it is possible to obtain a glass filament having a flat cross-sectional shape by controlling the temperature conditions. can.
• the shape may be oval, elliptical, or rectangular, for example.
• an ellipse means a shape in which the short sides of a rectangle are replaced with semicircles having diameters corresponding to the short sides.
• the fiber diameter of the glass filament can be measured as follows when the cross-sectional shape of the glass filament is a perfect circle or approximately a perfect circle. For example, first, the glass filaments are embedded in a resin such as an epoxy resin, the resin is cured, the cured resin is cut, and the cross section is polished. Next, a cross section of the cured resin is observed using an electron microscope, and the diameter of 100 or more glass filaments exposed in the cross section is measured. It can also be measured by processing an image obtained from an electron microscope with an automatic analyzer.
• a resin such as an epoxy resin
• the resin is cured
• the cured resin is cut
• the cross section is polished.
• a cross section of the cured resin is observed using an electron microscope, and the diameter of 100 or more glass filaments exposed in the cross section is measured. It can also be measured by processing an image obtained from an electron microscope with an automatic analyzer.
• the fiber diameter of the glass filament can be measured as follows. For example, first, the cross section of the glass fiber reinforced resin molded article is polished. Next, the filament diameter of the glass filament is measured in the same manner as the method for measuring the filament diameter of the glass filament described above.
• the fiber diameter of the glass filament can be measured as follows. For example, first, the cross-section of the glass filament is made observable in the same manner as in the method of measuring the filament diameter of the glass filament described above, and then the cross-sectional area is calculated for 100 or more glass filaments. Next, the converted fiber diameter is calculated based on the calculated cross-sectional area. Next, the fiber diameter of the glass filaments is calculated by obtaining the average value of the measured or calculated diameters or the converted fiber diameters.
• the equivalent fiber diameter of the glass filament means the diameter of a perfect circle having the same area as the cross-sectional area of the glass filament.
• the cross section of the glass filament means a cross section perpendicular to the fiber length direction of the glass fiber.
• the fiber diameter or equivalent fiber diameter of the glass filaments constituting the glass fiber of the present embodiment is, for example, in the range of 3.0 to 100.0 ⁇ m, preferably in the range of 4.0 to 70.0 ⁇ m. Preferably, it is in the range of 5.0-50.0 ⁇ m.
• the ratio of the major axis to the minor axis (major axis/minor axis) in the cross section is, for example, in the range of 2.0 to 10.0. , preferably in the range of 3.0 to 8.0.
• the short diameter and long diameter of the glass fiber can be calculated as follows. For example, first, in the same manner as the method of measuring the filament diameter of the glass filament described above, after making it possible to observe the glass filament cross section, an electron microscope is used to measure 100 or more glass filaments. The longest side passing through the glass filament cross section is taken as the major axis, and the side perpendicular to the major axis at approximately the center of the cross section of the glass filament is taken as the minor axis, and each length is measured. Then, it is calculated by obtaining the average value of the measured values of the major axis or the minor axis.
• the glass fiber reinforced resin molded product of the present embodiment contains the glass fiber of the present embodiment.
• the glass fiber contained in the glass fiber reinforced resin molded article of the present embodiment may be processed into various forms, and the forms that the glass fiber can be processed include, for example, chopped strands and rovings. , cut fibers.
• the chopped strand is a form in which a glass fiber (also referred to as a glass fiber bundle or glass strand), which is formed by bundling a predetermined number of glass filaments, is cut into a predetermined length.
• the number of glass filaments constituting the glass fiber (bundle number) is preferably 1 to 20,000, more preferably 50 to 10,000, and still more preferably 1,000 to 8,000.
• the glass fiber preferably has a thickness of 1.0 to 100.0 mm, more preferably 1.2 to 51.0 mm, even more preferably 1.5 to 30.0 mm, and particularly preferably 2.0 to 15.0 mm. 0 mm, most preferably cut to lengths in the range of 2.3 to 7.8 mm.
• the roving is a form in which the glass fibers, which are composed of bundles of 10 to 30,000 glass filaments, are not cut.
• the cut fiber is a glass fiber composed of 1 to 20,000 glass filaments bundled, and cut into a length in the range of 0.001 to 0.900 mm by a known method such as a ball mill or a Henschel mixer. It is in a crushed form.
• thermoplastic resin or a thermosetting resin can be used as the resin forming the glass fiber reinforced resin molded article of the present embodiment, but from the viewpoint of the recyclability of the resin itself, the thermoplastic resin is preferable.
• Thermoplastic resins forming the glass fiber reinforced resin molded article of the present embodiment include polyethylene, polypropylene, polystyrene, styrene/maleic anhydride resin, styrene/maleimide resin, polyacrylonitrile, acrylonitrile/styrene (AS) resin, acrylonitrile/ butadiene/styrene (ABS) resin, chlorinated polyethylene/acrylonitrile/styrene (ACS) resin, acrylonitrile/ethylene/styrene (AES) resin, acrylonitrile/styrene/methyl acrylate (ASA) resin, styrene/acrylonitrile (SAN) resin, Methacrylic resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polyamide, polyacetal, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (
• polyethylene examples include high density polyethylene (HDPE), medium density polyethylene, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and ultra high molecular weight polyethylene.
• HDPE high density polyethylene
• LDPE low density polyethylene
• LLDPE linear low density polyethylene
• ultra high molecular weight polyethylene examples include high density polyethylene (HDPE), medium density polyethylene, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and ultra high molecular weight polyethylene.
• polypropylene examples include isotactic polypropylene, atactic polypropylene, syndiotactic polypropylene, and mixtures thereof.
• polystyrene examples include general-purpose polystyrene (GPPS), which is atactic polystyrene having an atactic structure, high-impact polystyrene (HIPS) obtained by adding a rubber component to GPPS, syndiotactic polystyrene having a syndiotactic structure, and the like. can.
• GPPS general-purpose polystyrene
• HIPS high-impact polystyrene
• syndiotactic polystyrene having a syndiotactic structure and the like.
• methacrylic resin a polymer obtained by homopolymerizing one of acrylic acid, methacrylic acid, styrene, methyl acrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, and fatty acid vinyl ester, or two types Polymers obtained by copolymerizing the above can be exemplified.
• polyvinyl chloride a vinyl chloride homopolymer polymerized by a conventionally known emulsion polymerization method, suspension polymerization method, microsuspension polymerization method, bulk polymerization method, or the like, or copolymerizable with a vinyl chloride monomer. or a graft copolymer obtained by graft-polymerizing a vinyl chloride monomer to a polymer.
• polyamide examples include polycaproamide (polyamide 6), polyhexamethylene adipamide (polyamide 66), polytetramethylene adipamide (polyamide 46), polytetramethylene sebacamide (polyamide 410), polypentamethylene adipamide Pamide (Polyamide 56), Polypentamethylene Sebacamide (Polyamide 510), Polyhexamethylene Sebacamide (Polyamide 610), Polyhexamethylene Dodecamide (Polyamide 612), Polydecamethylene Adipamide (Polyamide 106), polydecamethylene sebacamide (polyamide 1010), polydecamethylene dodecamide (polyamide 1012), polyundecaneamide (polyamide 11), polyundecanamide (polyamide 116), polydodecanamide (polyamide 12), poly xylene adipamide (polyamide XD6), polyxylene sebacamide (polyamide XD10), polymetaxylylene adipamide (polyamide M
• polyacetal examples include homopolymers having oxymethylene units as main repeating units, and copolymers containing oxyalkylene units mainly consisting of oxymethylene units and having 2 to 8 adjacent carbon atoms in the main chain. A coalescence etc. can be mentioned.
• polyethylene terephthalate examples include polymers obtained by polycondensation of terephthalic acid or derivatives thereof and ethylene glycol.
• polystyrene resin examples include polymers obtained by polycondensation of terephthalic acid or derivatives thereof and 1,4-butanediol.
• polytrimethylene terephthalate examples include polymers obtained by polycondensation of terephthalic acid or its derivatives and 1,3-propanediol.
• polycarbonate a polymer obtained by a transesterification method in which a dihydroxydiaryl compound and a carbonate ester such as diphenyl carbonate are reacted in a molten state, or a polymer obtained by a phosgene method in which a dihydroxyaryl compound and phosgene are reacted. can be mentioned.
• polyarylene sulfide examples include linear polyphenylene sulfide, crosslinked polyphenylene sulfide whose molecular weight is increased by performing a curing reaction after polymerization, polyphenylene sulfide sulfone, polyphenylene sulfide ether, and polyphenylene sulfide ketone.
• modified polyphenylene ether examples include a polymer alloy of poly(2,6-dimethyl-1,4-phenylene) ether and polystyrene, a copolymer of poly(2,6-dimethyl-1,4-phenylene) ether and styrene/butadiene.
• polymer alloy with coalescence polymer alloy of poly(2,6-dimethyl-1,4-phenylene) ether and styrene/maleic anhydride copolymer, poly(2,6-dimethyl-1,4-phenylene) ether and polyamide, and polymer alloys of poly(2,6-dimethyl-1,4-phenylene) ether and styrene/butadiene/acrylonitrile copolymer.
• polyaryletherketone examples include polyetherketone (PEK), polyetheretherketone (PEEK), polyetherketoneketone (PEKK), polyetheretherketoneketone (PEEKK), and the like.
• liquid crystal polymer one or more selected from aromatic hydroxycarbonyl units, aromatic dihydroxy units, aromatic dicarbonyl units, aliphatic dihydroxy units, aliphatic dicarbonyl units, etc., which are thermotropic liquid crystal polyesters.
• aromatic hydroxycarbonyl units aromatic dihydroxy units
• aromatic dicarbonyl units aromatic dicarbonyl units
• aliphatic dihydroxy units aliphatic dicarbonyl units
• thermotropic liquid crystal polyesters thermotropic liquid crystal polyesters.
• a (co)polymer etc. which consist of a structural unit can be mentioned.
• fluororesin examples include polytetrafluoroethylene (PTFE), perfluoroalkoxy resin (PFA), fluoroethylene propylene resin (FEP), fluoroethylene tetrafluoroethylene resin (ETFE), polyvinyl fluoride (PVF), polyfluoride.
• PTFE polytetrafluoroethylene
• PFA perfluoroalkoxy resin
• FEP fluoroethylene propylene resin
• ETFE fluoroethylene tetrafluoroethylene resin
• PVF vinylidene chloride
• PCTFE polychlorotrifluoroethylene
• ECTFE ethylene/chlorotrifluoroethylene resin
• ionomer (IO) resin examples include a copolymer of olefin or styrene and unsaturated carboxylic acid, in which some of the carboxyl groups are neutralized with metal ions.
• olefin/vinyl alcohol resin examples include ethylene/vinyl alcohol copolymers, propylene/vinyl alcohol copolymers, saponified ethylene/vinyl acetate copolymers, saponified propylene/vinyl acetate copolymers, and the like. .
• cyclic olefin resin examples include monocyclic compounds such as cyclohexene, polycyclic compounds such as tetracyclopentadiene, and polymers of cyclic olefin monomers.
• polylactic acid examples include poly L-lactic acid that is a homopolymer of L-isomer, poly D-lactic acid that is a homopolymer of D-isomer, and stereocomplex polylactic acid that is a mixture thereof.
• cellulose resin examples include methylcellulose, ethylcellulose, hydroxycellulose, hydroxymethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose, hydroxypropylmethylcellulose, cellulose acetate, cellulose propionate, and cellulose butyrate.
• thermosetting resin forming the glass fiber reinforced resin molded article of the present embodiment includes unsaturated polyester resin, vinyl ester resin, epoxy (EP) resin, melamine (MF) resin, phenolic resin (PF), Urethane resin (PU), polyisocyanate, polyisocyanurate, polyimide (PI), urea (UF) resin, silicone (SI) resin, furan (FR) resin, benzoguanamine (BR) resin, alkyd resin, xylene resin, bismalade Triazine (BT) resin, diallyl phthalate resin (PDAP) and the like can be mentioned.
• the glass fiber-reinforced resin molded article of the present embodiment can be obtained, for example, by kneading the chopped strands and the resin with a twin-screw kneader and performing injection molding using the resulting resin pellets. can.
• the glass fiber reinforced resin molded product can be produced by injection compression molding, two-color molding, blow molding, foam molding (including supercritical fluid foam molding), insert molding, in-mold coating molding, extrusion molding.
• method sheet molding method, thermoforming method, rotational molding method, laminate molding method, press molding method, blow molding method, stamping molding method, infusion method, hand lay-up method, spray-up method, resin transfer molding method, sheet molding It may be obtained using a known molding method such as a compound method, a bulk molding compound method, a pultrusion method, or a filament winding method.
• the number average fiber length of the glass fiber of the present embodiment is, for example, 50 to 400 ⁇ m, preferably 75 to 300 ⁇ m, more preferably 100 to 380 ⁇ m. range, more preferably 120-350 ⁇ m, particularly preferably 150-320 ⁇ m, most preferably 170-290 ⁇ m, most preferably 205-285 ⁇ m.
• the number average fiber length of the glass fibers of the present embodiment can be calculated by the following method. First, a glass fiber reinforced resin molded product is heated in a muffle furnace at 650° C. for 0.5 to 24 hours to decompose organic matter. Next, the remaining glass fibers are transferred to a glass petri dish, and acetone is used to disperse the glass fibers on the surface of the petri dish. Next, the number average fiber length of the glass fibers is calculated by measuring the fiber lengths of 1000 or more glass fibers dispersed on the petri dish surface using a stereoscopic microscope and averaging the measured fiber lengths.
• the glass fiber contained in the glass fiber reinforced resin molded product of the present embodiment is used for the purpose of improving the adhesiveness between the glass fiber and the resin, improving the uniform dispersibility of the glass fiber in the mixture of the glass fiber and the resin, etc. , the surface of which may be coated with an organic substance.
• organic substances include resins and silane coupling agents.
• the organic substance may be a composition containing a lubricant, a surfactant, etc. in addition to a resin or a silane coupling agent.
• the organic substance covers the glass fiber at a rate of 0.1 to 2.0% by mass based on the mass of the glass fiber in a state where it is not coated with the organic substance.
• the coating of the glass fiber with an organic substance can be performed, for example, in the glass fiber manufacturing process using a known method such as a roller applicator, the resin, the silane coupling agent, or the sizing agent containing the solution of the composition. It can be carried out by applying a binder to the glass fibers and then drying the glass fibers coated with the solution of the resin, the silane coupling agent, or the composition.
• the resins include urethane resins, epoxy resins, vinyl acetate resins, acrylic resins, modified polypropylenes, especially carboxylic acid-modified polypropylenes, (poly)carboxylic acids, especially maleic acid and unsaturated monomer copolymers. be able to.
• silane coupling agent examples include aminosilane, chlorosilane, epoxysilane, mercaptosilane, vinylsilane, acrylsilane, and cationic silane.
• silane coupling agent these compounds can be used alone, or two or more of them can be used in combination.
• Aminosilanes include ⁇ -aminopropyltriethoxysilane, N- ⁇ -(aminoethyl)- ⁇ -aminopropyltrimethoxysilane, N- ⁇ -(aminoethyl)-N′- ⁇ -(aminoethyl)- ⁇ - Aminopropyltrimethoxysilane, ⁇ -anilinopropyltrimethoxysilane and the like can be mentioned.
• chlorosilane examples include ⁇ -chloropropyltrimethoxysilane and the like.
• epoxysilanes include ⁇ -glycidoxypropyltrimethoxysilane and ⁇ -(3,4-epoxycyclohexyl)ethyltrimethoxysilane.
• Mercaptosilane includes ⁇ -mercaptotrimethoxysilane and the like.
• vinylsilane examples include vinyltrimethoxysilane and N- ⁇ -(N-vinylbenzylaminoethyl)- ⁇ -aminopropyltrimethoxysilane.
• acrylsilane examples include ⁇ -methacryloxypropyltrimethoxysilane.
• cationic silanes include N-(vinylbenzyl)-2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride and N-phenyl-3-aminopropyltrimethoxysilane hydrochloride.
• lubricant examples include modified silicone oils, animal oils and their hydrogenated products, vegetable oils and their hydrogenated products, animal waxes, vegetable waxes, mineral waxes, condensates of higher saturated fatty acids and higher saturated alcohols, and polyethyleneimine. , polyalkylpolyamine alkylamide derivatives, fatty acid amides, and quaternary ammonium salts. These lubricants can be used alone, or two or more of them can be used in combination.
• animal oils examples include beef tallow.
• vegetable oils examples include soybean oil, coconut oil, rapeseed oil, palm oil, and castor oil.
• Animal waxes include beeswax and lanolin.
• Examples of vegetable waxes include candelilla wax and carnauba wax.
• mineral wax examples include paraffin wax and montan wax.
• Condensates of higher saturated fatty acids and higher saturated alcohols include stearates such as lauryl stearate.
• fatty acid amides include dehydration condensates of polyethylene polyamines such as diethylenetriamine, triethylenetetramine and tetraethylenepentamine and fatty acids such as lauric acid, myristic acid, palmitic acid and stearic acid.
• quaternary ammonium salts include alkyltrimethylammonium salts such as lauryltrimethylammonium chloride.
• surfactant examples include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants. These surfactants can be used alone, or two or more of them can be used in combination.
• Nonionic surfactants include ethylene oxide propylene oxide alkyl ethers, polyoxyethylene alkyl ethers, polyoxyethylene-polyoxypropylene-block copolymers, alkylpolyoxyethylene-polyoxypropylene-block copolymer ethers, polyoxyethylene fatty acid esters.
• polyoxyethylene fatty acid monoester polyoxyethylene fatty acid diester, polyoxyethylene sorbitan fatty acid ester, glycerol fatty acid ester ethylene oxide adduct, polyoxyethylene castor oil ether, hydrogenated castor oil ethylene oxide adduct, alkylamine ethylene oxide adduct , fatty acid amide ethylene oxide adduct, glycerol fatty acid ester, polyglycerin fatty acid ester, pentaerythritol fatty acid ester, sorbitol fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, polyhydric alcohol alkyl ether, fatty acid alkanolamide, acetylene glycol, acetylene alcohol , an ethylene oxide adduct of acetylene glycol, an ethylene oxide adduct of acetylene alcohol, and the like.
• cationic surfactants include alkyldimethylbenzylammonium chloride, alkyltrimethylammonium chloride, alkyldimethylethylammonium ethylsulfate, higher alkylamine acetate, higher alkylamine hydrochloride, ethylene oxide adducts to higher alkylamines, higher Condensates of fatty acids and polyalkylene polyamines, salts of esters of higher fatty acids and alkanolamines, salts of higher fatty acid amides, imidazoline-type cationic surfactants, alkylpyridinium salts and the like can be mentioned.
• anionic surfactants include higher alcohol sulfates, higher alkyl ether sulfates, ⁇ -olefin sulfates, alkylbenzenesulfonates, ⁇ -olefinsulfonates, reactions of fatty acid halides with N-methyltaurine.
• examples include the product, dialkyl sulfosuccinate, higher alcohol phosphate, and higher alcohol ethylene oxide adduct phosphate.
• amphoteric surfactants include amino acid-type amphoteric surfactants such as alkylaminopropionic acid alkali metal salts, betaine-type such as alkyldimethylbetaine, imidazoline-type amphoteric surfactants, and the like.
• glass fiber reinforced resin molded product examples include parts such as housings and frames of mobile electronic devices typified by smartphones, automotive electrical components such as battery tray covers, sensors, and coil bobbins, electronic device parts other than mobile electronic devices, It can be used for electrical connection terminal parts and the like.
• glass raw materials were mixed to obtain glass batches so that the glass compositions after melting and solidification had the respective compositions of Examples 1 to 20 and Comparative Examples 1 to 4 shown in Tables 1 to 3.
• the obtained glass batch is placed in a platinum crucible, and the platinum crucible is held in an electric furnace for 4 hours under temperature conditions in the range of 1400 to 1550 ° C., and the glass raw material is melted while being stirred to obtain a homogeneous product. A molten glass was obtained.
• the platinum crucible containing the molten glass was taken out from the electric furnace, and the molten glass was cooled.
• Thermal expansion coefficient The massive glass cullet is processed into a test piece of 4 mm ⁇ 4 mm ⁇ 20 mm using a cutting machine such as a diamond cutter and a grinder, and the obtained test piece is heated at a temperature increase rate of 10 ° C./min, At a temperature in the range of 50 to 200 ° C., the thermal expansion coefficient of the glass fiber is measured by measuring the elongation using a thermomechanical analyzer (manufactured by Hitachi High-Tech Science Co., Ltd.) and calculating the linear expansion coefficient from the elongation. was measured.
• a thermomechanical analyzer manufactured by Hitachi High-Tech Science Co., Ltd.
• a glass composition for glass fiber prepared to a predetermined composition was melted in a melting furnace as a glass raw material, and spun with a bushing having a nozzle of 200 holes or more to obtain a glass fiber (filament) having a circular cross section. 50 fibers were randomly selected from the glass filaments, and the fiber diameter was measured for each filament.
• the percentage W of the value obtained by dividing the standard deviation of the fiber diameter by the average value of the fiber diameter, the percentage of the value obtained by dividing the difference between the maximum value and the average value of the fiber diameter by the average value, and the minimum value of the fiber diameter and the percentage of the value obtained by dividing the difference between the average values by the average value, the percentage X of the larger value was calculated.
• C was rated when the percentage W was over 15.0% or the percentage X was over 20.0%.
• a glass composition for glass fiber prepared to a predetermined composition was melted in a melting furnace as a glass raw material, and spun with a bushing having a nozzle of 200 holes or more to obtain a glass fiber (filament) having a flat cross section. 50 fibers were randomly selected from the glass filaments, and the short diameter, long diameter and converted fiber diameter were measured for each filament. At this time, the percentage Y of the value obtained by dividing the standard deviation of the ratio of the major diameter to the minor diameter (variant ratio) by the average value, and the percentage Z of the value obtained by dividing the standard deviation of the circular conversion fiber diameter by the average value were calculated.
• the SiO 2 content SI the Al 2 O 3 content A, the CaO content C, the TiO 2 content T, the P 2 O 5 content P, the According to the glass compositions for glass fibers of Examples 1 to 20, in which the ZnO content Z and the SO 3 content SO satisfy the formula (1), the variation in fiber diameter of the obtained glass fibers can be reduced to It is clear that it can be suppressed.
• the SiO2 content SI the Al2O3 content A, the CaO content C , the TiO2 content T, the P2O5 content P, and the ZnO content
• Z and the SO 3 content SO do not satisfy the formula (1)

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• 2022
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