Low density, high performance glass fiber composition, and glass fiber and composite material thereof

Abstract

Provided herein is a low density, high performance glass fiber composition, and glass fiber and composite materials thereof, wherein the glass fiber composition contains, by weight percent: SiO2 58.1~61.9%, Al2O3>19.8% and ≦23%, MgO 9.6~12.7%, CaO 4.1~7.9%, SrO+Li2O 0.05~2.2%, SrO 0~2%, Li2O 0~0.39%, Na2O 0.05~1.0%, R2O=Na2O+K2O+Li2O 0.2~1.6%, Fe2O3 0.05~1%, TiO2 0.01~2%, B2O3 0~2%, ZrO2 0~2%, SiO2+Al2O3 78~84%; and the total content of the above components is 98.5% or more, and in weight percent, C1=SiO2 / (CaO+ That 2 O ) is 7.05 or more, the range of C2=(R2O+SrO) / Al2O3 is 0.012 or more, and the range of C3=(MgO+SrO) / CaO is 1.22 or more. The glass fiber composition has low density and high modulus properties, higher specific elastic modulus and specific strength, and is more excellent in terms of weight reduction and cost. In addition, it can improve the crystallization temperature and speed of glass and expand the molding range of glass fiber, which is advantageous in reducing production difficulty and improving efficiency, and is suitable for producing lightweight and high-performance glass fiber in large-scale tank furnaces.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed with the China Patent Office on March 29, 2023, bearing application number 202310319034.6 and entitled "Low-density, high-performance glass fiber composition, and glass fiber and composite materials therewith," the entire contents of which are incorporated herein by reference.

[0002] This application relates to glass fiber compositions, and more particularly to low-density, high-performance glass fiber compositions that can be used as reinforcing substrates for advanced composite materials, and to glass fibers and composite materials using the same. [Background technology]

[0003] Glass fiber is an inorganic fiber material that can be reinforced with resins to produce high-performance composites. As a reinforcing substrate for advanced composites, high-performance glass fiber was initially used primarily in aerospace, national defense, military, and sports equipment. With technological advances and economic development, high-performance glass fiber has been widely applied in civilian industrial fields such as wind turbines, automobile manufacturing, high-pressure vessels, electronics and communications, building materials, and pipes. The wind power industry's growing need for larger, lighter blades to actively promote global carbon emissions peaking and carbon neutrality has placed new demands on the development of glass fiber. The pursuit of higher modulus and strength, lower density, better specific modulus and specific strength, better formability, lower costs, and lower production risks, while also enabling large-scale tank furnace production, has made it an urgent task to effectively improve the performance, cost-effectiveness, and lightweight levels of high-performance glass fiber.

[0004] S-glass is one of the oldest and most highly efficient glasses, primarily composed of the MgO-Al2O3-SiO2 system. The ASTM International organization defines S-glass as a family of glasses primarily composed of oxides of magnesium, alumina, and silicon, with the most representative being S-2 glass, developed in the United States. In S-2 glass, the SiO2 and Al2O3 contents reach 90% by weight, with approximately 65% ​​and 25% SiO2 and 25% Al2O3, respectively, and approximately 10% MgO. This results in a high glass melting temperature and difficulty, with a high glass forming temperature of 1571°C and a high liquidus temperature of 1470°C. This not only makes glass fiber forming difficult, but also significantly increases the risk of crystallization due to the lack of sufficient free oxygen, which causes a large amount of alumina ions to fill the gaps in the network along with magnesium ions. At the same time, the lack of effective competitiveness during crystallization leads to a strong tendency for a single crystalline phase to precipitate, resulting in high crystallization temperatures and rapid crystallization. These factors make the production of S-2 glass fiber extremely difficult, not only making large-scale tank furnace production impossible, but also making it difficult to produce glass fiber using a one-step method. As a result, the production of S-2 glass fiber is small-scale, inefficient, and costly, and cannot meet the application requirements of large-scale industrialization.

[0005] A French company developed R-glass fiber based on the MgO-CaO-Al2O3-SiO2 system under patent FR1435073A. However, the alumina content of the conventional R-glass fiber was too high, and the total silica-alumina content and total alkaline earth metal oxide content and their ratios were unreasonable. This made molding difficult, resulting in a high risk of crystallization, a molding temperature of 1410°C, a liquidus temperature of 1350°C, and a rapid crystallization rate. These factors made it difficult to achieve large-scale production of conventional R-glass fiber in tank furnaces. Meanwhile, publicly available data indicates that the conventional R-glass fiber has a modulus of less than 90 GPa, resulting in poor cost performance and competitiveness.

[0006] JP8231240 discloses a glass fiber composition containing, by weight, 62-67% SiO2, 22-27% Al2O3, 7-15% MgO, 0.1-1.1% CaO, 0.1-1.1% B2O3, etc. Compared to S-glass, this composition has an improved bubble content, but molding is still very difficult, and the molding temperature exceeds 1460°C, making it disadvantageous for large-scale tank furnace production.

[0007] CN108609859A discloses a high-modulus glass fiber composition containing, by weight, 53-55.9% SiO2, 1.1-23.9% Al2O3, 9.9-11.8% MgO, 8.2-9.9% CaO, 76.5-79% SiO2 + Al2O3, and 0.38-0.45 Al2O3 / SiO2. This composition has a too low silicon oxide content, a high alumina-silicon ratio, and a high calcium oxide content, resulting in a high glass density, low forming temperature, high liquidus temperature, and a small forming range ΔT value, which are unfavorable for improving the forming and weight reduction level of the glass fiber. Summary of the Invention

[0008] The main objective of the present application is to provide a low-density, high-performance glass fiber composition, and a composite material made of the glass fiber. The glass fiber composition has low density and high modulus properties, higher specific modulus and specific strength, and is more lightweight and advantageous in terms of cost. Furthermore, the glass crystallization temperature and rate can be improved, and the molding range of glass fiber can be expanded, which is advantageous for reducing production difficulty and improving efficiency, and is suitable for producing lightweight, high-performance glass fiber in large-scale tank furnaces.

[0009] According to one aspect of the present application, the composition contains the following components in weight percent: SiO2 58.1~61.9% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~7.9% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378~84% The total content of the above components is 98.5% or more, and the range of C1 = SiO2 / (CaO + Li2O) is 7.05 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is 1.22 or more, by weight.

[0010] It further specifies that the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.64 or more by weight.

[0011] It is further specified that the range of C5 = (SiO2 + Al2O3) / (CaO + R2O) is 8.8 or more by weight.

[0012] It further specifies that the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more by weight.

[0013] It further specifies that the range of C3=(MgO+SrO) / CaO, in weight percent, is greater than 1.50.

[0014] It further specifies that the CaO content is 4.1 to 6.9% by weight.

[0015] It further specifies that the SrO content is 0.05 to 2% by weight.

[0016] The glass fiber composition contains the following components in weight percent: SiO2 58.4~61.5% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~7.5% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378.3~84% CaO+MgO+R2O≦20.3% The total content of the above components is 98.5% or more, and in weight percent, the range of C1 = SiO2 / (CaO + Li2O) is 7.45 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, the range of C3 = (MgO + SrO) / CaO is 1.30 or more, and the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.60 or more.

[0017] It further specifies that the Li2O content is 0.01 to 0.35% by weight.

[0018] The glass fiber composition contains the following components in weight percent: SiO2 58.1~61.9% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~7.9% SrO+Li2O 0.05~2.2% SrO 0.01~2% Li2O 0.01~0.35% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378~84% The total content of the above components is 98.5% or more, and the range of C1 = SiO2 / (CaO + Li2O) is 7.05 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is 1.22 or more, in weight percent.

[0019] It further specifies that the SiO2 content is 58.4 to 60.45% by weight.

[0020] It further specifies that the Al2O3 content is greater than 19.8% and not more than 20.45% by weight.

[0021] The glass fiber composition contains the following components in weight percent: SiO2 58.8~60.45% Al2O3>19.8% and ≦23% MgO 9.6~12.5% CaO 4.1~6.9% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.35% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O3>79% and ≦83.3% The total content of the above components is 98.5% or more, and the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is 1.40 or more, in weight percent.

[0022] It further specifies that the combined content of SiO2, Al2O3, MgO and CaO in the composition is less than 99%.

[0023] The glass fiber composition contains the following components in weight percent: SiO2 58.8~60.45% Al2O3>19.8% and ≦23% MgO 10-12.5% CaO 4.1~6.9% SrO+Li2O 0.05~2.2% SrO 0.05~2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.35% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O3>79% and ≦83.3% CaO+MgO+R2O≦19.6% The total content of the above components is 98.5% or more, and in weight percent, the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, the range of C3 = (MgO + SrO) / CaO is 1.40 or more, and the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.74 or more. It is further specified that the composition does not contain Li2O.

[0024] It is further provided that the composition is free of rare earth oxides.

[0025] The glass density of the composition is 2.60 g / cm 3 It further specifies that the

[0026] According to another aspect of the present application, there is provided a glass fiber produced from the above glass fiber composition.

[0027] According to a third aspect of the present application, there is provided a composite material comprising the above glass fiber. DETAILED DESCRIPTION OF THE INVENTION

[0028] In the glass fiber composition of the present application, it is preferable to appropriately increase the contents of SiO and AlO, while controlling the total amount and ratio of SiO+AlO; appropriately reduce the total amount of alkaline earth metal oxides, while controlling their ratios; and introduce an appropriate amount of SrO+LiO. The main points of the invention are to accurately control the ratios of SiO / (CaO+LiO), (R0+SrO) / AlO, (MgO+SrO) / CaO, SiO / (AlO+LiO), and (SiO+AlO) / (CaO+R0), and further to control the total amounts of NaO+K0+LiO and CaO+MgO+R0. By controlling the specific composition and ratios, first, the synergistic effect between silicon ions and alumina ions or oxygen ions is enhanced, the oxygen-silicon ratio and oxygen-alumina ratio are controlled, and the total amount and ratio of extra-network ions such as alkali metals and alkaline earth metals are controlled, resulting in a better structural layering effect. This not only increases the glass modulus but also reduces density, increasing the specific modulus and effectively improving the lightweight level of the glass fiber. Second, the glass is controlled to form mixed crystalline states such as cordierite, anorthite, and enstatite during devitrification, preventing a single crystalline phase from dominating. The competitive growth of multiple crystalline phases at a suitable ratio effectively inhibits ion recombination alignment, thereby effectively reducing the risk of devitrification and the rate of crystal precipitation. Third, the glass forming temperature can be appropriately controlled, expanding the forming range of glass fiber and achieving cost advantages. This makes it suitable for the production of lightweight, high-performance glass fiber in tank furnaces.

[0029] Specifically, the glass fiber composition of the present application contains the following components in weight percent: SiO2 58.1~61.9% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~7.9% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378~84% The total content of the above components is 98.5% or more, and the range of C1 = SiO2 / (CaO + Li2O) is 7.05 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is 1.22 or more, in weight percent.

[0030] The role and content of each component in the glass fiber composition will be explained below.

[0031] SiO2 is a glass network-forming oxide and is the main component forming the glass skeleton. It stabilizes each component and can also improve the mechanical properties and chemical stability of the glass. In the glass fiber composition of the present application, the SiO2 content range is specified to be 58.1 to 61.9 wt%. The silicon oxide content is set to 58.1% or more to ensure excellent mechanical properties and obtain a lower density and a higher specific modulus. The silicon oxide content is set to 61.9% or less to prevent the glass viscosity and liquidus temperature from becoming too high, which would make melting and mass production of the glass difficult. This significantly differs from S-glass. Preferably, the SiO2 content range may be specified to be 58.4 to 61.5 wt%. Preferably, the SiO2 content range may be specified to be 58.4 to 60.45 wt%. Preferably, the SiO2 content range may be specified to be 58.8 to 60.45 wt%. More preferably, the range of the SiO2 content may be specified to be 59.15 to 60.45 wt %.

[0032] Al2O3 is a glass network intermediate oxide with multiple variations in coordination number. It is also one of the oxides that form the glass framework. Bonding with SiO2 plays a substantial role in the mechanical performance of glass and plays an important role in influencing the crystal precipitation and acid etching resistance of glass. To obtain sufficient glass properties such as modulus and specific elastic modulus, it is desirable to increase the Al2O3 content. However, if the Al2O3 content is too high, the glass is prone to crystal precipitation, which in turn leads to phase separation, and the viscosity of the glass becomes too high, making melting and fining difficult. In the glass fiber composition of the present application, the Al2O3 content is specified to be in the range of more than 19.8 wt% and not more than 23 wt%. Preferably, the Al2O3 content may be specified to be in the range of more than 19.8 wt% and not more than 22.5 wt%. Preferably, the Al2O3 content may be specified to be in the range of 19.85 to 22.2 wt%. Preferably, the Al2O3 content may be specified to be in the range of 19.9 to 21.9 wt%. More preferably, the range of the Al2O3 content may be specified to be 19.9 to 21 wt %.

[0033] In the glass fiber composition of the present application, the total content of SiO2 + Al2O3 is specified to be 78 to 84 wt%. Preferably, the total content of SiO2 + Al2O3 may be specified to be 78.3 to 84 wt%. Preferably, the total content of SiO2 + Al2O3 may be specified to be 78.3 to 83.3 wt%. More preferably, the total content of SiO2 + Al2O3 may be specified to be greater than 79 wt% and not greater than 83.3 wt%. By accurately controlling the contents, total amounts, and ratios of SiO2 and Al2O3, not only can a sufficiently high glass modulus be obtained, but also the glass density and risk of crystal precipitation can be reduced, the molding range can be expanded, and this is advantageous for realizing large-scale tank furnace production.

[0034] CaO is an oxide outside the glass network and contributes significantly to improving the chemical stability of glass, controlling glass crystal precipitation, and adjusting the viscosity and material properties of glass. Through research, the inventors discovered that in glass systems with low alkali metal content and low free oxygen content, calcium ions can efficiently provide free oxygen to alumina ions and change the alumina coordination, while magnesium ions with a high content tend to fill gaps in the network while simultaneously controlling oxygen ions around themselves. In the glass fiber composition of the present application, the CaO content is specified to be 4.1 to 7.9 wt. Calcium ions fill gaps in the network and simultaneously provide a large amount of free oxygen. When mixed with magnesium ions, strontium ions, etc. in a certain ratio, a synergistic effect can be achieved, contributing to a tight structural lamination effect. Furthermore, cordierite (Mg2Al4SiO5O 18The formation of a mixed crystal state of MgO, anorthite (CaAl2SiO8), enstatite (Mg2SiO6), etc. contributes to suppressing crystal precipitation and contributes to improving the material properties of the glass and increasing the forming speed of glass fibers. However, in order to obtain low density and high mechanical properties, it is not preferable to add CaO in an amount exceeding 7.9% in addition to a high content of MgO. Also, it is not preferable to add CaO in an amount less than 4.1%, because too little CaO does not supply a large amount of free oxygen and does not produce anorthite to effectively compete with cordierite and other elements during glass crystal precipitation. Preferably, the CaO content range may be specified to be 4.1 to 7.5 wt%. Preferably, the CaO content range may be specified to be 4.1 to 6.9 wt%. Preferably, the CaO content range may be specified to be 4.7 to 6.9 wt%. More preferably, the CaO content range may be specified to be 5.3 to 6.9 wt%.

[0035] MgO is a glass network intermediate oxide that contributes significantly to improving the glass modulus, controlling glass crystal precipitation, and adjusting the viscosity and material properties of the glass. Through research, the inventors discovered that in glass systems with low alkali metal content and high alumina content, MgO is typically located outside the glass framework network in the form of an [MgO6] octahedron and plays a role in charge balancing around [AlO4]. However, significant changes in the number of free oxygen atoms in the glass affect the coordination number of magnesium ions. In the glass fiber composition of the present application, the MgO content range is specified to be 9.6 to 12.7 wt%. Preferably, the MgO content range may be specified to be 9.6 to 12.5 wt%. Preferably, the MgO content range may be specified to be 10 to 12.5 wt%. More preferably, the MgO content range may be specified to be 10 to 12 wt%.

[0036] SrO is an oxide outside the glass network and contributes significantly to controlling the crystal precipitation of glass, improving the mechanical and optical properties of glass, and adjusting the viscosity of glass. In the glass fiber composition of the present application, the SrO content range is specified to be 0 to 2 wt %. Experiments have shown that by incorporating an appropriate amount of SrO into the composition of the present application and rationally controlling the content, total amount, and ratio of various alkaline earth metal oxides, the ternary mixed alkaline earth effect of CaO, MgO, and SrO is significantly improved compared to the binary mixed alkaline earth effect of CaO and MgO, and the structure is more easily layered, resulting in superior crystal precipitation performance, mechanical properties, optical properties, etc. of the glass. Mg 2+ , Ca 2+ , Sr 2+ Since the ionic radii of the three ions increase successively and the ionic field strength decreases successively, the ordered arrangement of the three ions is important for achieving a structurally dense layer stack. Preferably, the SrO content may be specified to be in the range of 0.01 to 2 wt %. Preferably, the SrO content may be specified to be in the range of 0.05 to 2 wt %. More preferably, the SrO content may be specified to be in the range of 0.2 to 1.5 wt %.

[0037] Na2O is an oxide outside the glass network. As a glass flux, it acts to cut the network, reduce the viscosity of the glass, improve the melting of the glass, and effectively supply free oxygen. However, the introduction of Na2O can also lead to a decrease in the mechanical properties, chemical stability, and thermal stability of the glass. Therefore, in the low-density, high-performance glass fiber composition of the present application, adding too much Na2O is undesirable. In the glass fiber composition of the present application, the Na2O content range is specified to be 0.05 to 1.0 wt%. Preferably, the Na2O content range may be specified to be 0.05 to 0.8 wt%. Preferably, the Na2O content range may be specified to be 0.05 to 0.65 wt%. More preferably, the Na2O content range may be specified to be 0.05 to 0.5 wt%. K2O is an oxide outside the glass network and can also cut the network. However, its role in reducing the viscosity of the glass is slightly weaker than Na2O, and it can also effectively reduce the surface tension and improve the transparency of the glass. By combining K2O with Na2O, a mixed alkali effect occurs at a certain ratio, which is advantageous for obtaining a better glass ion layering effect. However, if the K2O content is too high, it affects the chemical stability and thermal stability of the glass, so adding too much is not preferable. In the glass fiber composition of the present application, the K2O content may be further specified to be in the range of 0.05 to 0.8 wt%. More preferably, the K2O content may be specified to be in the range of 0.1 to 0.6 wt%.

[0038] Li2O is an oxide that is an outer component of the glass network and plays a relatively special role in glass. When the oxygen-silicon ratio is low, it mainly plays a bond-breaking role, significantly reducing the viscosity of the glass and improving its melting properties. When the oxygen-silicon ratio is high, the radius of lithium ions is smaller than that of sodium and potassium ions, resulting in a stronger ionic field and primarily playing a role in aggregation. At the same time, a small amount of Li2O can provide more free oxygen, allowing more alumina ions to form tetrahedral coordination, strengthening the glass network structure, improving glass performance, and improving glass crystallization. However, due to the high cost of lithium raw materials, too much Li2O increases costs, significantly affecting product price and cost performance. It also significantly reduces the viscosity of the glass, limiting the range of glass fiber forming and adversely affecting large-scale production and industrial application. At the same time, a high lithium content also reduces the chemical stability of glass. Therefore, the Li2O content in the glass fiber composition of this application is specified to be 0 to 0.39 wt%. Depending on different technical requirements, in one technical solution, the Li2O content may be preferably specified to be in the range of 0.01 to 0.35 wt%, preferably specified to be in the range of 0.01 to 0.25 wt%, and more preferably specified to be in the range of 0.01 to 0.2 wt%. In another technical solution, the Li2O content may be preferably specified to be in the range of 0 to 0.35 wt%, and more preferably specified to be in the range of 0 to 0.2 wt%. Furthermore, in order to reduce production costs and expand the range of molding, the glass fiber composition of the present application does not necessarily need to contain Li2O.

[0039] In the glass fiber composition of the present application, in order to simultaneously achieve the objectives of controlling glass crystal precipitation, glass density, and cost, as well as providing free oxygen, and to utilize the advantages of the combination of strontium oxide and lithium oxide, the content range of SrO+Li2O is specified to be 0.05 to 2.2 wt%. Preferably, the content range of SrO+Li2O may be specified to be 0.1 to 2 wt%. Preferably, the content range of SrO+Li2O may be specified to be 0.2 to 2 wt%. More preferably, the content range of SrO+Li2O may be specified to be 0.2 to 1.5 wt%.

[0040] In the glass fiber composition of the present application, the content range of Na2O + K2O + Li2O is specified to be 0.2 to 1.6 wt%. Preferably, the content range of Na2O + K2O + Li2O may be specified to be 0.2 to 1.35 wt%. Preferably, the content range of Na2O + K2O + Li2O may be specified to be 0.25 to 1 wt%. More preferably, the content range of Na2O + K2O + Li2O may be specified to be 0.25 to 0.8 wt%.

[0041] In order to ensure the performance of the glass, reduce the density, and control the oxygen-silicon ratio, the glass fiber composition of the present application is specified to have a weight percent C1 = SiO2 / (CaO + Li2O) range of 7.05 or more. Preferably, the weight percent C1 = SiO2 / (CaO + Li2O) range may be specified to be 7.45 or more. Preferably, the weight percent C1 = SiO2 / (CaO + Li2O) range may be specified to be 8.25 or more. Preferably, the weight percent C1 = SiO2 / (CaO + Li2O) range may be specified to be 8.25 to 12.30. More preferably, the weight percent C1 = SiO2 / (CaO + Li2O) range may be specified to be 8.30 to 11.60.

[0042] Al is used to control the crystal precipitation, density and oxygen-alumina ratio of the glass. 3+In consideration of the need for ionic free oxygen, in order to promote the formation of alumina tetrahedra from more alumina ions, strengthen the glass network structure, improve glass performance, and suppress crystal precipitation in the glass fiber composition of the present application, the range of C2 = (R2O + SrO) / Al2O3, by weight, is specified to be 0.012 or greater. Preferably, the range of C2 = (R2O + SrO) / Al2O3, by weight, may be specified to be 0.015 to 0.10. Preferably, the range of C2 = (R2O + SrO) / Al2O3, by weight, may be specified to be 0.02 to 0.085. More preferably, the range of C2 = (R2O + SrO) / Al2O3, by weight, may be specified to be 0.02 to 0.065.

[0043] To improve the performance of the glass and control crystal precipitation in the glass, the glass fiber composition of the present application is specified to have a weight percent range of C3 = (MgO + SrO) / CaO of 1.22 or greater. Preferably, the weight percent range of C3 = (MgO + SrO) / CaO may be specified to be 1.30 or greater. Preferably, the weight percent range of C3 = (MgO + SrO) / CaO may be specified to be 1.40 or greater. Preferably, the weight percent range of C3 = (MgO + SrO) / CaO may be specified to be greater than 1.50. More preferably, the weight percent range of C3 = (MgO + SrO) / CaO may be specified to be greater than 1.50 and not greater than 2.50.

[0044] Furthermore, in the glass fiber composition of the present application, the range of C4 = SiO2 / (Al2O3 + Li2O) may be specified to be 2.60 or greater, by weight percent. Preferably, the range of C4 = SiO2 / (Al2O3 + Li2O) may be specified to be 2.64 or greater, by weight percent. Preferably, the range of C4 = SiO2 / (Al2O3 + Li2O) may be specified to be 2.74 or greater, by weight percent. More preferably, the range of C4 = SiO2 / (Al2O3 + Li2O) may be specified to be 2.80 or greater, by weight percent.

[0045] Furthermore, in the glass fiber composition of the present application, the range of C5 = (SiO2 + Al2O3) / (CaO + R2O) may be specified to be 8.8 or greater by weight. Preferably, the range of C5 = (SiO2 + Al2O3) / (CaO + R2O) may be specified to be 9.4 or greater by weight. Preferably, the range of C5 = (SiO2 + Al2O3) / (CaO + R2O) may be specified to be 9.8 to 15.0 by weight. More preferably, the range of C5 = (SiO2 + Al2O3) / (CaO + R2O) may be specified to be 10.3 to 14.5 by weight.

[0046] Furthermore, in the glass fiber composition of the present application, the range of C6 = (Na2O + K2O) / R2O may be specified to be 0.40 or greater, by weight percent. Preferably, the range of C6 = (Na2O + K2O) / R2O may be specified to be 0.50 or greater, by weight percent. More preferably, the range of C6 = (Na2O + K2O) / R2O may be specified to be 0.55 or greater, by weight percent.

[0047] Furthermore, in the glass fiber composition of the present application, the content range of CaO+MgO+R2O may be specified to be 20.3% by weight or less. Preferably, the content range of CaO+MgO+R2O may be specified to be 19.6% by weight or less. Preferably, the content range of CaO+MgO+R2O may be specified to be 19.2% by weight or less. More preferably, the content range of CaO+MgO+R2O may be specified to be 16 to 19.2% by weight.

[0048] Fe2O3 is advantageous for melting glass and can also improve the crystal precipitation performance of glass. However, because iron ions and ferrous ions have a coloring effect, adding too much of them is not preferable. Therefore, in the glass fiber composition of the present application, the Fe2O3 content range is specified to be 0.05 to 1 wt %. Preferably, the Fe2O3 content range may be specified to be 0.05 to 0.75 wt %. More preferably, the Fe2O3 content range may be specified to be 0.1 to 0.65 wt %.

[0049] TiO2 not only reduces the viscosity of glass at high temperatures, but also has a certain fluxing effect. However, titanium ions combine with iron ions to have a certain coloring effect, affecting the appearance of glass fiber products, so an excessively high content is undesirable. Therefore, in the glass fiber composition of the present application, the TiO2 content range is specified to be 0.01 to 2%. Preferably, the TiO2 content range may be specified to be 0.05 to 1.5%. More preferably, the TiO2 content range may be specified to be 0.05 to 0.7%.

[0050] In the present application, selectively introducing an appropriate amount of B2O3 can further reduce the density of the glass and improve the crystal precipitation of the glass. In the glass fiber composition of the present application, the B2O3 content range is specified to be 0 to 2 wt%. Preferably, the B2O3 content range may be specified to be 0 to 1.5 wt%. Depending on different technical requirements, in one technical solution, the glass fiber composition of the present application may be substantially free of B2O3 to improve the mechanical performance and chemical stability of the glass. In another implementation, in order to further reduce the density of the glass and ensure performance, the B2O3 content range may be further specified to be 0.1 to 1.5 wt%.

[0051] In the present application, the chemical stability and heat resistance of glass can be improved by selectively introducing an appropriate amount of ZrO2. In the glass fiber composition of the present application, the ZrO2 content range is specified to be 0 to 2 wt%. Preferably, the ZrO2 content range may be specified to be 0 to 1%. Depending on different technical requirements, in some technical solutions, the glass fiber composition of the present application may be substantially free of ZrO2 in order to control the density of the glass, but this does not exclude trace amounts of zirconia that are incorporated as impurities by zirconium-containing refractories.

[0052] Furthermore, these components are the main components of the present application, and the total content of these components is specified to be 98.5% by weight or more. Furthermore, the total content of the main components may be specified to be 99% by weight or more. Furthermore, the total content of the main components may be specified to be 99.5% by weight or more.

[0053] The glass fiber composition of the present application may contain small amounts of other components in addition to the main components, with the total content being less than 1.5 wt %. Furthermore, the glass fiber composition of the present application may contain less than 1 wt % of other components. Furthermore, the glass fiber composition of the present application may contain less than 0.5 wt % of other components. Furthermore, the glass fiber composition of the present application may contain less than 0.5 wt % of F, which is generally introduced as an impurity via glass raw materials.

[0054] Furthermore, in order to control production costs and glass density, the glass fiber composition of the present application may not contain rare earth oxides.

[0055] Furthermore, the glass density of the glass fiber composition of the present invention is 2.61 g / cm 3 Preferably, the glass density of the composition is controlled to 2.60 g / cm. 3 Preferably, the glass density of the composition is less than 2.59 g / cm 3 More preferably, the glass density of the composition is less than 2.58 g / cm 3 Less than.

[0056] Furthermore, the molding temperature of the glass fiber of the glass fiber composition of the present application may be controlled to 1360°C or lower. Preferably, the molding temperature of the glass fiber of the composition is 1290 to 1360°C. Preferably, the molding temperature of the glass fiber of the composition is in the range of more than 1300°C to 1360°C or lower. More preferably, the molding temperature of the glass fiber of the composition is 1306 to 1355°C.

[0057] The advantageous effects of setting the content ranges of each component in the glass fiber composition of the present application within the above ranges will be explained using specific experimental data in the examples.

[0058] An example of a preferred range of values ​​for each component contained in the glass fiber composition according to the present application is shown below.

[0059] Preferred Embodiment 1 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.4~60.45% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~7.5% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378.3~84% The total content of the above components is 98.5% or more, and the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is 1.30 or more, in weight percent, to provide a low-density, high-performance glass fiber composition.

[0060] Preferred Embodiment 2 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.1~61.9% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~7.9% SrO+Li2O 0.05~2.2% SrO 0.01~2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378~84% The total content of the above components is 98.5% or more, and in weight percent, the range of C1 = SiO2 / (CaO + Li2O) is 7.05 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, the range of C3 = (MgO + SrO) / CaO is 1.22 or more, and the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.64 or more.

[0061] Preferred Embodiment 3 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.4~60.45% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~6.9% SrO+Li2O 0.05~2.2% SrO 0.01~2% Li2O 0.01~0.35% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.35% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378.3~83.3% The present invention provides a low-density, high-performance glass fiber composition in which the total content of the above components is 98.5% or more, and the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is 1.40 or more, in weight percent.

[0062] Preferred Embodiment 4 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.1~61.9% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~7.5% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378~84% The total content of the above components is 98.5% or more, and the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is greater than 1.50, in weight percent.

[0063] Preferred Embodiment 5 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.4~60.45% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~6.9% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.35% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378.3~83.3% The total content of the above components is 98.5% or more, and the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is greater than 1.50, in weight percent.

[0064] Preferred Embodiment 6 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.1~61.9% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~7.9% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378~84% The total content of the above components is 98.5% or more, and in weight percent, the range of C1 = SiO2 / (CaO + Li2O) is 7.05 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, the range of C3 = (MgO + SrO) / CaO is 1.22 or more, and the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.60 or more, and the material does not contain rare earth oxides.

[0065] Preferred Embodiment 7 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.1~61.9% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~6.9% SrO+Li2O 0.05~2% SrO 0.05~2% Li2O 0% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378~84% The total content of the above components is 98.5% or more, and in weight percent, the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, the range of C3 = (MgO + SrO) / CaO is 1.40 or more, and the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.60 or more, and the total content of SiO2, Al2O3, MgO and CaO is less than 99% by weight.

[0066] Preferred Embodiment 8 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.4~60.45% Al2O3>19.8% and ≦23% MgO 9.6~12.7% CaO 4.1~7.9% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378.3~83.3% The total content of the above components is 98.5% or more, and, in weight percent, the range of C1 = SiO2 / (CaO + Li2O) is 7.05 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, the range of C3 = (MgO + SrO) / CaO is 1.22 or more, and the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.60 or more, and the glass density of the composition is 2.60 g / cm 3 is less than.

[0067] Preferred Embodiment 9 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.4~60.45% Al2O3>19.8% and ≦23% MgO 9.6~12.5% CaO 4.1~6.9% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.6% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O378.3~83.3% The total content of the above components is 98.5% or more, and in weight percent, the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, the range of C3 = (MgO + SrO) / CaO is greater than 1.50, and the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.74 or more.

[0068] Preferred Embodiment 10 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.8~60.45% Al2O3>19.8% and ≦23% MgO 10-12.5% CaO 4.1~6.9% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% NaO 0.05 to 1.0% R2O = Na2O + K2O + Li2O 0.2 to 1.35% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O3>79% and ≦83.3% CaO+MgO+R2O≦19.2% The total content of the above components is 98.5% or more, and in weight percent, the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, the range of C3 = (MgO + SrO) / CaO is greater than 1.50, and the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.74 or more.

[0069] Preferred Embodiment 11 The glass fiber composition of the present application contains the following components in weight percent: SiO2 58.8~60.45% Al2O3>19.8% and ≦20.45% MgO 10-12.5% CaO 4.1~6.9% SrO+Li2O 0.05~2.2% SrO 0-2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.35% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O3>79% and ≦80.9% The total content of the above components is 98.5% or more, the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is greater than 1.50, and the total content of SiO2, Al2O3, MgO and CaO is less than 99% by weight.

[0070] Preferred Embodiment 12 The glass fiber composition of the present application contains the following components in weight percent: SiO2 59.15~60.45% Al2O3>19.8% and ≦23% MgO 10-12.5% CaO 4.1~6.9% SrO+Li2O 0.05~2.2% SrO 0.01~2% Li2O 0~0.39% Na2O 0.05~1.0% R2O = Na2O + K2O + Li2O 0.2-1.35% Fe2O3 0.05-1% TiO20.01-2% B2O3 0~2% ZrO20-2% SiO2+Al2O3>79% and ≦83.3% CaO+MgO+R2O≦19.2% The total content of the above components is 99% or more, the range of C1 = SiO2 / (CaO + Li2O) is 8.25 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, the range of C3 = (MgO + SrO) / CaO is greater than 1.50, and the range of C4 = SiO2 / (Al2O3 + Li2O) is 2.74 or more, and the total content of SiO2, Al2O3, MgO, and CaO is less than 99% by weight, and the density of the glass is 2.60 g / cm 3 is less than. [Example]

[0071] The technical solution of the present application will be explained clearly and completely below with reference to specific examples of the present application. Obviously, the described examples are only some of the examples of the present application, not all of the examples. All other examples that can be obtained by a person skilled in the art based on the examples of the present application without paying labor equivalent to the inventive step are within the scope of protection of the present application. Furthermore, the examples of the present application and the features in the examples can be arbitrarily combined with each other as long as they are not contradictory.

[0072] Basic idea of ​​the present application: The glass fiber composition contains the following components in weight percent: SiO258.1~61.9%, Al2O3>19.8% and ≦23%, MgO 9.6~12.7%, CaO 4.1~7.9%, SrO+Li2O 0.05~2.2%, SrO 0~2%, Li2O 0~0.39%, Na2O 0.05~1.0%, R2O=Na2O+K2O+Li2O 0.2~1.6%, Fe2O30.05~1%, TiO20.01~2%, B2O30~2%, ZrO20~2%, SiO2+Al2O378~84%; The total content of the above components is 98.5% or more, and in weight percent, C1 = SiO2 / (CaO + That 2 O) is 7.05 or more, the range of C2 = (R2O + SrO) / Al2O3 is 0.012 or more, and the range of C3 = (MgO + SrO) / CaO is 1.22 or more. The glass fiber composition has low density and high modulus properties, higher specific modulus and specific strength, and is superior in terms of weight reduction and cost. Furthermore, it can improve the glass crystallization temperature and rate and expand the glass fiber molding range, which is advantageous for reducing production difficulty and improving efficiency, and is suitable for producing lightweight, high-performance glass fiber in large-scale tank furnaces.

[0073] As examples, specific contents of SiO2, Al2O3, CaO, MgO, SrO, Na2O, K2O, Li2O, Fe2O3, TiO2, etc. in the glass fiber composition of the present application are selected, and the performance parameters are compared with those of three comparative examples. Seven performance parameters are selected for comparison. (1) Molding temperature: The viscosity of the molten glass is 10 3 It corresponds to the temperature at which it becomes poise. (2) Liquidus temperature: The temperature at which crystal nuclei begin to form when the glass melt is cooled, that is, the upper limit temperature at which glass crystals precipitate. (3) ΔT value: The difference between the molding temperature and the liquidus temperature, which indicates the temperature range for wire drawing molding. The larger the molding range, the more advantageous it is for wire drawing. (4) Glass Modulus: Characterizes the ability of glass to resist elastic deformation, and the modulus of glass blocks is tested according to the ASTM E1876 standard. (5) Glass Density: Characterizes the specific gravity and lightening level of glass and is measured in accordance with the ASTM C693 standard. (6) Specific modulus: Calculated as the ratio of glass modulus to density, converted at 1 kg = 9.8 N. The higher the specific modulus, the greater the rigidity of the material, resulting in a better level of weight reduction. (7) Crystalline Phase Composition: The composition of the major crystalline phases in glassy crystalline materials can be characterized and evaluated using XRD. Cordierite is abbreviated as COR, anorthite as ANO, enstatite as ENS, diopside as DIO, and wollastonite as WOL.

[0074] The above seven parameters and their measurement methods are well known to those skilled in the art and can be used to strongly describe the performance of the glass fiber compositions of the present application.

[0075] The specific experimental procedure was as follows: each component was obtained from the appropriate raw materials, and the raw materials were mixed in the ratio required to achieve the final desired weight percentage. The mixed batch was melted and refined, and then the glass liquid was drawn through a nozzle on a bushing to form glass fibers, which were then drawn by the rotating head of a wire drawing machine to form raw yarn or lumps. Of course, these glass fibers could be deep-drawn using conventional methods to meet the desired requirements.

[0076] Below, a comparison of performance parameters between examples of the glass fiber composition of the present invention and comparative examples is shown in a table. Here, the content of the glass fiber composition is shown in weight percent. Note that the total content of the components in the examples is slightly less than 100%, and the remaining amount can be understood as trace impurities and minor components that cannot precipitate.

[0077] [Table 1A]

[0078] [Table 1B]

[0079] [Table 1C]

[0080] [Table 1D]

[0081] As is clear from the specific values ​​in the table above, the glass fiber composition of the present application has the following advantages compared to typical boron-free E glass (Comparative Example 1) and improved R glass (Comparative Examples 2 and 3): (1) a higher glass modulus, (2) a lower glass density, (3) a much higher specific modulus and weight reduction level, and (4) a richer composition of crystalline phases in the crystalline substance, which contributes to effectively suppressing the crystal precipitation and rate of glass.

[0082] Compared with Comparative Example 3, the content of lithium oxide that can be selected in the glass fiber composition of the present invention is lower, which is advantageous for cost reduction and industrial application.

[0083] From this, it can be seen that the glass fiber composition of the present application has achieved great progress in terms of density, modulus, specific modulus, control of crystal precipitation, and low cost, and the cost performance and weight reduction level of the technical solution are better, which makes it easier to realize large-scale tank furnace production and produces unexpected technical effects.

[0084] According to the glass fiber composition of the present invention, glass fibers having the above-mentioned excellent properties can be produced.

[0085] The glass fiber compositions of the present application can be combined with one or more organic and / or inorganic materials to produce composites with superior performance, such as glass fiber reinforced substrates typically applied in wind blades, automotive products, high pressure vessels, pipes, etc.

[0086] Finally, it should be noted that, in this specification, the terms "comprise," "contain," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a procedure, method, article, or installation that includes a set of elements includes not only those elements, but also other elements not expressly listed, or includes the inherent elements of such procedure, method, article, or installation. An element defined by the expression "comprises," unless further limited, does not exclude that additional identical elements are further present in the procedure, method, article, or installation that includes said element.

[0087] The above description can be implemented alone or in various combinations, and all such variations are within the scope of protection of the present invention.

[0088] Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present application and are not intended to limit the present invention. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may be amended or some of the technical features may be replaced with equivalents, and such amendments or replacements will not deviate from the essence of the corresponding technical solutions and the spirit and scope of the technical solutions of the embodiments of the present application. [Industrial Applicability]

[0089] The glass fiber composition of the present application has low density and high modulus properties, higher specific modulus and specific strength, and is superior in terms of weight reduction and cost advantage. Furthermore, it can improve the crystallization temperature and rate of glass and expand the range of glass fiber molding, which is advantageous for reducing production difficulty and improving efficiency, and is suitable for producing lightweight, high-performance glass fibers in large-scale tank furnaces. By combining the glass fiber composition with one or more organic and / or inorganic materials, it is possible to produce composite materials with excellent performance, such as glass fiber reinforced substrates typically used in wind blades, automotive products, high-pressure vessels, pipes, etc.

Claims

1. It contains the following components in weight percent: Yes ２ 58.1~61.9% Al ２ O ３ >19.8% and ≦23% MgO 9.6-12.7% CaO 4.1-7.9% SrO+Li ２ O 0.05~2.2% SrO 0-2% Li ２ O 0~0.39% Na ２ O 0.05~1.0% R ２ O=NK ２ O+K ２ O+L& ２ O 0.2~1.6% Fe ２ O ３ 0.05~1% TO ２ 0.01~2% B ２ O ３ 0~2% ZrO ２ 0~2% SiO ２ +Al ２ Oh ３ 78~84% The total content of the above components is 98.5% or more, and in weight percent, C1 = SiO ２ / (CaO+Li ２ O) is in the range of 7.05 to 12.30, and C2 = (R ２ O+SrO) / Al ２ O ３ A low-density, high-performance glass fiber composition characterized in that the range of C3=(MgO+SrO) / CaO is 0.012 or more and the range of C3=(MgO+SrO) / CaO is 1.22 or more.

2. In weight percent, C4 = SiO ２ / (Al ２ O ３ +Li ２ 2. The low density, high performance glass fiber composition of claim 1, wherein the range of .DELTA..times ...

3. In weight percent, C1 = SiO ２ / (CaO+Li ２ 2. The low density, high performance glass fiber composition of claim 1, wherein the range of .DELTA.O is 8.25 to 12.

30.

4. 10. The low density, high performance glass fiber composition of claim 1, characterized in that the range of C3 = (MgO + SrO) / CaO, in weight percent, is greater than 1.

50.

5. 2. The low-density, high-performance glass fiber composition of claim 1, wherein the CaO content ranges from 4.1 to 6.9 wt. %.

6. 2. The low-density, high-performance glass fiber composition according to claim 1, characterized in that the SrO content ranges from 0.05 to 2% by weight.

7. Li ２ 2. The low-density, high-performance glass fiber composition according to claim 1, wherein the O content ranges from 0.01 to 0.35 wt %.

8. SiO ２ 2. The low-density, high-performance glass fiber composition according to claim 1, wherein the content range of is 58.4 to 60.45 wt.%.

9. It contains the following components in weight percent: Yes ２ 58.8~60.45% Al ２ O ３ >19.8% and ≦23% MgO 9.6-12.5% CaO 4.1-6.9% SrO+Li ２ O 0.05~2.2% SrO 0-2% Li ２ O 0~0.39% Na ２ O 0.05~1.0% R ２ O=NK ２ O+K ２ O+L& ２ O 0.2~1.35% Fe ２ O ３ 0.05~1% TO ２ 0.01~2% B ２ O ３ 0~2% ZrO ２ 0~2% SiO ２ +Al ２ O ３ >79% and ≦83.3% The total content of the above components is 98.5% or more, and in weight percent, C1 = SiO ２ / (CaO+Li ２ O) is in the range of 8.25 to 12.30, and C2 = (R ２ O+SrO) / Al ２ O ３ 2. The low-density, high-performance glass fiber composition according to claim 1, wherein the range of C3=(MgO+SrO) / CaO is 0.012 or more, and the range of C3=(MgO+SrO) / CaO is 1.40 or more.

10. SiO ２ , Al ２ O ３ 2. The low-density, high-performance glass fiber composition according to claim 1, characterized in that the total content of MgO and CaO is less than 99%.

11. It contains the following components in weight percent: Yes ２ 58.8~60.45% Al ２ O ３ >19.8% and ≦23% MgO 10-12.5% CaO 4.1-6.9% SrO+Li ２ O 0.05~2.2% SrO 0.05-2% Li ２ O 0~0.39% Na ２ O 0.05~1.0% R ２ O=NK ２ O+K ２ O+L& ２ O 0.2~1.35% Fe ２ O ３ 0.05~1% TO ２ 0.01~2% B ２ O ３ 0~2% ZrO ２ 0~2% SiO ２ +Al ２ O ３ >79% and ≦83.3% CaO+MgO+R ２ O ≦19.6% The total content of the above components is 98.5% or more, and in weight percent, C1 = SiO ２ / (CaO+Li ２ O) is in the range of 8.25 to 12.30, and C2 = (R ２ O+SrO) / Al ２ O ３ is 0.012 or more, C3 = (MgO + SrO) / CaO is 1.40 or more, and C4 = SiO ２ / (Al ２ O ３ +Li ２ 2. The low density, high performance glass fiber composition of claim 1, wherein the range of .DELTA..times ...

12. Li ２ 2. The low-density, high-performance glass fiber composition of claim 1, which is free of O.

13. Glass density is 2.60 g / cm ３ 10. The low density, high performance glass fiber composition of claim 1, wherein the fiber density is less than 100%.

14. A glass fiber, characterized in that it is produced from the glass fiber composition according to any one of claims 1 to 13.

15. A composite material comprising the glass fiber of claim 14.

Images