High-performance, low-density fiberglass components, fiberglass, and composite materials of those materials.
Patent Information
- Authority / Receiving Office
- TH · TH
- Patent Type
- Applications
- Current Assignee / Owner
- JUSUE GRP CO LTD
- Filing Date
- 2023-04-10
- Publication Date
- 2025-12-08
Abstract
Description
A low-density high-performance glass fiber composition and its glass fiber and composite material
[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 29, 2023, with application number 202310319034.6 and invention name “A low-density, high-performance glass fiber composition, its glass fiber and composite material”, the entire contents of which are incorporated by reference into this application. Technical Field
[0002] The present application relates to a glass fiber composition, and in particular to a low-density, high-performance glass fiber composition that can be used as a reinforced matrix for advanced composite materials, and the glass fiber and composite material thereof. Background Art
[0003] Glass fiber is an inorganic fiber material that can be used to reinforce resin to produce composite materials with excellent performance. As a reinforcing matrix for advanced composite materials, high-performance glass fiber was initially mainly used in aviation, aerospace, national defense and military industry, sports equipment and other fields. With the advancement of science and technology and economic development, high-performance glass fiber has been widely used in civilian industrial fields such as wind blades, automobile manufacturing, high-pressure vessels, electronic communications, construction materials, pipelines, etc. In order to actively promote global carbon peak and carbon neutrality, the demand for large-scale and lightweight blades in the wind power industry continues to increase, which puts forward new requirements for the development of glass fiber; the pursuit of higher modulus and strength, lower density, better specific modulus and specific strength, better molding performance, lower cost and production risk, and the realization of large-scale pool kiln production, effectively taking into account the improvement of the performance, cost-effectiveness and lightweight level of high-performance glass fiber has become an urgent task.
[0004] S-glass is one of the earliest high-performance glasses, with a composition primarily based on the MgO-Al2O3-SiO2 system. ASTM International defines S-glass as a family of glasses composed primarily of magnesium, aluminum, and silicon oxides. A typical example is S-2 glass, developed in the United States. The combined weight percentage of SiO2 and Al2O3 in S-2 glass reaches 90%, with SiO2 and Al2O3 accounting for approximately 65% and 25%, respectively, and MgO at approximately 10%. The glass is difficult to melt at high temperatures, with a molding temperature as high as 1571°C and a liquidus temperature as high as 1470°C. This not only makes glass fiber molding difficult, but also, due to a lack of sufficient free oxygen, a large number of aluminum ions are forced to fill the network voids alongside magnesium ions, significantly increasing the risk of crystallization. Furthermore, the lack of effective competition during crystallization leads to a strong tendency for a single crystalline phase to crystallize, resulting in high crystallization temperatures and rapid crystallization rates. These factors make the production of S-2 glass fiber too difficult. Not only can large-scale pool kiln production not be achieved, but even one-step glass fiber production is difficult. As a result, the production scale of S-2 glass fiber is small, the efficiency is low, and the cost is high, which cannot meet the application requirements of large-scale industrialization.
[0005] A French company has developed R-glass, based on the MgO-CaO-Al2O3-SiO2 system, covered by patent FR1435073A. However, traditional R-glass has an excessively high alumina content, and the total amount of silicon and aluminum, the total amount of alkaline earth metal oxides, and their ratios are poorly designed. This makes glass molding difficult and increases the risk of crystallization. Its molding temperature reaches 1410°C, its liquidus temperature reaches 1350°C, and its crystallization rate is rapid. These factors make large-scale tank kiln production of traditional R-glass difficult. Furthermore, public data indicates that the modulus of traditional R-glass is less than 90 GPa, making it less cost-effective and competitive.
[0006] Japanese Patent JP8231240 discloses a glass fiber composition containing, by weight, 62-67% SiO2, 22-27% Al2O3, 7-15% MgO, 0.1-1.1% CaO, and 0.1-1.1% B2O3. While this composition has improved bubble count compared to S-glass, molding remains difficult, requiring temperatures exceeding 1460°C, making it unsuitable for large-scale tank furnace production.
[0007] Chinese patent CN108609859A discloses a high-modulus glass fiber composition containing, by weight, 53-55.9% SiO2, 21.1-23.9% Al2O3, 9.9-11.8% MgO, 8.2-9.9% CaO, 76.5-79% SiO2 + Al2O3, and an Al2O3 / SiO2 ratio of 0.38-0.45. Due to the low silicon oxide content, high aluminum-silicon ratio, and high calcium oxide content, this composition results in a high glass density, a low molding temperature, a high liquidus temperature, and a small molding range ΔT value, which is not conducive to glass fiber molding and lightweighting.
[0008] Summary of the Invention
[0009] The main purpose of this application is to provide a low-density, high-performance glass fiber composition and its glass fiber and composite material. The glass fiber composition has the characteristics of low density and high modulus, has a higher specific modulus and specific strength, is more lightweight, and has more cost advantages. It can also improve the glass crystallization temperature and rate, expand the glass fiber molding range, and is conducive to reducing production difficulty and improving efficiency. It is suitable for large-scale pool kiln production of lightweight high-performance glass fibers.
[0010] According to one aspect of the present application, a low-density, high-performance glass fiber composition is provided, wherein the glass fiber composition comprises the following components, and the content of each component is expressed in weight percentage as follows:
[0011] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 7.05, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, and the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.22.
[0012] The weight percentage ratio C4=SiO2 / (Al2O3+Li2O) is further limited to a range greater than or equal to 2.64.
[0013] The weight percentage ratio C5=(SiO2+Al2O3) / (CaO+R2O) is further limited to a range greater than or equal to 8.8.
[0014] The weight percentage ratio C1=SiO2 / (CaO+Li2O) is further limited to a range greater than or equal to 8.25.
[0015] The weight percentage ratio C3=(MgO+SrO) / CaO is further limited to a range greater than 1.50.
[0016] The CaO content is further limited to 4.1-6.9% by weight.
[0017] The SrO content is further limited to 0.05-2% by weight.
[0018] The glass fiber composition contains the following components, and the content of each component is expressed in weight percentage as follows:
[0019] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 7.45, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.30, and the weight percentage ratio C4 = SiO2 / (Al2O3+Li2O) is in the range of greater than or equal to 2.60.
[0020] The content of Li2O is further limited to 0.01-0.35% by weight.
[0021] The glass fiber composition contains the following components, and the content of each component is expressed in weight percentage as follows:
[0022] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 7.05, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, and the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.22.
[0023] The SiO2 content is further limited to 58.4-60.45% by weight.
[0024] The content of Al2O3 is further limited to be greater than 19.8% and less than or equal to 20.45% by weight.
[0025] The glass fiber composition contains the following components, and the content of each component is expressed in weight percentage as follows:
[0026] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, and the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.40.
[0027] Wherein, it is further limited that the total content of SiO2, Al2O3, MgO and CaO in the composition is less than 99%.
[0028] The glass fiber composition contains the following components, and the content of each component is expressed in weight percentage as follows:
[0029] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.40, and the weight percentage ratio C4 = SiO2 / (Al2O3+Li2O) is in the range of greater than or equal to 2.74.
[0030] Wherein, it is further specified that the composition does not contain Li2O.
[0031] It is further specified that the composition does not contain rare earth oxides.
[0032] The glass density of the composition is further limited to less than 2.60 g / cm 3 .
[0033] According to another aspect of the present application, a glass fiber is provided. The glass fiber is made of the above-mentioned glass fiber composition.
[0034] According to a third aspect of the present application, a composite material is provided, comprising the above-mentioned glass fiber.
[0035] The main innovations of the glass fiber composition of the present application are: appropriately increasing the content of SiO2 and Al2O3 and controlling the total amount and ratio of SiO2+Al2O3, appropriately reducing the total amount of alkaline earth metal oxides and controlling the ratio, preferably introducing an appropriate amount of SrO+Li2O, accurately controlling the ratios of SiO2 / (CaO+Li2O), (R2O+SrO) / Al2O3, (MgO+SrO) / CaO, SiO2 / (Al2O3+Li2O) and (SiO2+Al2O3) / (CaO+R2O), and further controlling the total amount of Na2O+K2O+Li2O and CaO+MgO+R2O. Through the above-mentioned specific composition and proportion control, on the one hand, the synergistic effect between silicon ions and aluminum ions and oxygen ions can be improved, the oxygen-silicon ratio and oxygen-aluminum ratio can be controlled, and the total amount and proportion of network extracellular ions such as alkali metals and alkaline earth metals can be controlled to obtain a better structural stacking effect, which can not only increase the glass modulus, but also reduce the density, thereby increasing the specific modulus and effectively improving the lightweight level of the glass fiber; on the other hand, the glass can be controlled to form a mixed crystal state of cordierite, anorthite, enstatite, etc. when it becomes devitrified, avoiding the absolute dominant role of a single crystal phase. The competitive growth of multiple crystal phases in appropriate proportions can effectively inhibit the reorganization arrangement of ions, thereby effectively reducing the risk of glass devitrification and the crystallization rate; on the third hand, the glass molding temperature can be appropriately controlled, the glass fiber molding range can be expanded, and the cost is more advantageous, which is suitable for the pool kiln production of lightweight high-performance glass fiber.
[0036] Specifically, the glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0037] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 7.05, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, and the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.22.
[0038] The functions and contents of the various components in the glass fiber composition are described as follows:
[0039] SiO2 is a glass network-forming oxide, forming the main component of the glass skeleton. It stabilizes the various components and improves the mechanical properties and chemical stability of the glass. In the glass fiber composition of this application, the SiO2 content is limited to 58.1-61.9% by weight. To ensure excellent mechanical properties, low density, and high specific modulus, the silica content is not less than 58.1%. To prevent excessively high glass viscosity and liquidus temperature, which would make glass melting and large-scale production difficult, the silica content is not higher than 61.9%, which clearly distinguishes it from S-glass. Preferably, the SiO2 content can be limited to 58.4-61.5% by weight. Preferably, the SiO2 content can be limited to 58.4-60.45% by weight. Preferably, the SiO2 content can be limited to 58.8-60.45% by weight. More preferably, the SiO2 content can be limited to 59.15-60.45% by weight.
[0040] Al2O3 is an intermediate oxide in the glass network, exhibiting various coordination number transitions. It is also one of the oxides that form the glass skeleton. Combined with SiO2, it has a substantial effect on the mechanical properties of glass and plays an important role in influencing glass crystallization and acid corrosion resistance. To achieve sufficiently high modulus, specific modulus, and other properties, it is desirable to increase the Al2O3 content. However, too high an Al2O3 content can make the glass prone to crystallization and even phase separation, and can also increase the glass viscosity, making melting and clarification difficult. In the glass fiber composition of the present application, the weight percentage range of Al2O3 is limited to greater than 19.8% and less than or equal to 23%. Preferably, the weight percentage range of Al2O3 can be limited to greater than 19.8% and less than or equal to 22.5%. Preferably, the weight percentage range of Al2O3 can be limited to 19.85-22.2%. Preferably, the weight percentage range of Al2O3 can be limited to 19.9-21.9%. More preferably, the weight percentage range of Al2O3 can be limited to 19.9-21%.
[0041] In the glass fiber composition of the present application, the total content of SiO2+Al2O3 is limited to 78-84%. Preferably, the total content of SiO2+Al2O3 can be limited to 78.3-84%. Preferably, the total content of SiO2+Al2O3 can be limited to 78.3-83.3%. More preferably, the total content of SiO2+Al2O3 can be limited to greater than 79% and less than or equal to 83.3%. By precisely controlling the content, total amount and ratio of SiO2 and Al2O3, not only can a sufficiently high glass modulus be obtained, but also the glass density and crystallization risk can be reduced, the molding range can be expanded, and it is conducive to achieving large-scale tank kiln production.
[0042] CaO is an oxide outside the glass network, and plays a substantial role in improving the chemical stability of glass, controlling glass crystallization, and regulating glass viscosity and material properties. The inventors have found through research that in a glass system with a low alkali metal content and a small amount of free oxygen, calcium ions can more effectively provide free oxygen to aluminum ions and change the aluminum-oxygen coordination, while high-content magnesium ions tend to control oxygen ions around themselves while filling the network gaps. In the glass fiber composition of the present application, the weight percentage content of CaO is limited to 4.1-7.9%. Calcium ions can provide a large amount of free oxygen while filling the network gaps, and form a mixed synergistic effect with magnesium ions / strontium ions at a certain ratio, which is conducive to obtaining a tight structural stacking effect, and is also conducive to the formation of cordierite (Mg2Al4Si5O 18 ), anorthite (CaAl2Si2O8), enstatite (Mg2Si2O6), etc., thereby achieving the effect of inhibiting crystallization, and also helping to improve the glass material properties and increase the glass fiber forming speed. However, in order to obtain lower density and higher mechanical properties, on the basis of a high content of MgO, the amount of CaO introduced should not exceed 7.9%. At the same time, the amount of CaO introduced should not be lower than 4.1%, because too low a CaO content cannot provide a large amount of free oxygen, nor can it produce enough anorthite to effectively compete with cordierite and the like during glass crystallization. Preferably, the weight percentage content range of CaO can be limited to 4.1-7.5%. Preferably, the weight percentage content range of CaO can be limited to 4.1-6.9%. Preferably, the weight percentage content range of CaO can be limited to 4.7-6.9%. More preferably, the weight percentage content range of CaO can be limited to 5.3-6.9%.
[0043] MgO is an intermediate oxide in the glass network, and plays a substantial role in improving the glass modulus, controlling glass crystallization, and adjusting the glass viscosity and material properties. The inventors have found through research that in a glass system with a low alkali metal content and a high alumina content, it is usually located outside the glass skeleton network in the form of [MgO6] octahedrons, playing a role in valence balance around [AlO4]. However, when the amount of free oxygen in the glass changes significantly, it will affect the coordination number of magnesium ions. In the glass fiber composition of the present application, the weight percentage content range of MgO is limited to 9.6-12.7%. Preferably, the weight percentage content range of MgO can be limited to 9.6-12.5%. Preferably, the weight percentage content range of MgO can be limited to 10-12.5%. More preferably, the weight percentage content range of MgO can be limited to 10-12%.
[0044] SrO is an oxide outside the glass network, and plays a substantial role in controlling glass crystallization, improving the mechanical and optical properties of glass, and adjusting the viscosity of glass. In the glass fiber composition of the present application, the weight percentage of SrO is limited to 0-2%. A large number of experimental studies have shown that an appropriate amount of SrO can be introduced into the composition of the present application. By reasonably controlling the content, total amount and ratio of various alkaline earth metal oxides, the effect of 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 likely to form a dense stack, thereby making the crystallization performance, mechanical properties and optical properties of the glass more excellent. Due to Mg 2+ , Ca 2+ 、Sr 2+ The ionic radius increases successively, and the ionic field strength decreases successively. To achieve a densely packed structure, the quantitative gradation of the three ions is very important. Preferably, the weight percentage content of SrO can be limited to 0.01-2%. Preferably, the weight percentage content of SrO can be limited to 0.05-2%. More preferably, the weight percentage content of SrO can be limited to 0.2-1.5%.
[0045] Na2O is an oxide outside the glass network. As a glass flux, it can break the network, reduce glass viscosity, improve glass melting, and effectively provide free oxygen. However, the introduction of Na2O will also lead to a decrease in the mechanical properties, chemical stability, and thermal stability of the glass. Therefore, the amount of Na2O introduced into the low-density, high-performance glass fiber composition system of the present application should not be too much. In the glass fiber composition of the present application, the weight percentage content range of Na2O is limited to 0.05-1.0%. Preferably, the weight percentage content range of Na2O can be limited to 0.05-0.8%. Preferably, the weight percentage content range of Na2O can be limited to 0.05-0.65%. More preferably, the weight percentage content range of Na2O can be limited to 0.05-0.5%. K2O is an oxide outside the glass network and can also break the network, but its effect on reducing glass viscosity is slightly lower than that of Na2O. It can also effectively reduce surface tension and increase glass transparency. When used in combination with Na2O at certain ratios, a mixed alkali effect can be produced, which helps achieve better glass ionomer stacking. However, excessive K2O content can also affect the chemical and thermal stability of the glass, so the amount introduced should be kept to a minimum. In the glass fiber composition of the present application, the K2O content can be limited to a weight percentage range of 0.05-0.8%. More preferably, the K2O content can be limited to a weight percentage range of 0.1-0.6%.
[0046] Li2O is an oxide outside the glass network, and its role in the glass is quite special. When the oxygen and silicon are relatively small, it mainly plays a bond-breaking role, which can significantly reduce the viscosity of the glass and improve the glass melting performance; when the oxygen and silicon are relatively large, since the radius of lithium ions is smaller than that of sodium and potassium ions, the ion field is strong, and it mainly plays an accumulation role; at the same time, a small amount of Li2O can also provide considerable free oxygen, which is conducive to more aluminum ions forming tetrahedral coordination, strengthening the glass network structure, improving glass performance, and improving glass crystallization. However, due to the high price of lithium raw materials, too much Li2O will lead to excessively high costs, significantly affecting the price and cost-effectiveness of the product, and it is easy to greatly reduce the viscosity of the glass, but narrow the glass fiber molding range, which is not conducive to large-scale production and industrial application; at the same time, the chemical stability of high-lithium glass will also be reduced. Therefore, in the glass fiber composition of the present application, the weight percentage content of Li2O is limited to 0-0.39%. Depending on the technical requirements, in one technical solution, the weight percentage range of Li2O can be preferably limited to 0.01-0.35%; preferably, the weight percentage range of Li2O can be limited to 0.01-0.25%; more preferably, the weight percentage range of Li2O can be limited to 0.01-0.2%. In another technical solution, the weight percentage range of Li2O can be preferably limited to 0-0.35%; more preferably, the weight percentage range of Li2O can be limited to 0-0.2%. Furthermore, to reduce production costs and expand the molding range, the glass fiber composition of the present application may not contain Li2O.
[0047] To balance controlling glass crystallization, glass density, cost, and providing free oxygen, and to flexibly leverage the combined advantages of strontium oxide and lithium oxide, the glass fiber composition of this application limits the SrO + Li2O content to a range of 0.05-2.2% by weight. Preferably, the SrO + Li2O content can be limited to a range of 0.1-2% by weight. Preferably, the SrO + Li2O content can be limited to a range of 0.2-2% by weight. More preferably, the SrO + Li2O content can be limited to a range of 0.2-1.5% by weight.
[0048] In the glass fiber composition of the present application, the weight percentage range of Na2O+K2O+Li2O is limited to 0.2-1.6%. Preferably, the weight percentage range of Na2O+K2O+Li2O can be limited to 0.2-1.35%. Preferably, the weight percentage range of Na2O+K2O+Li2O can be limited to 0.25-1%. More preferably, the weight percentage range of Na2O+K2O+Li2O is 0.25-0.8%.
[0049] In order to ensure glass performance, reduce density and control the oxygen-silicon ratio, in the glass fiber composition of the present application, the range of the weight percentage ratio C1=SiO2 / (CaO+Li2O) is limited to be greater than or equal to 7.05. Preferably, the range of the weight percentage ratio C1=SiO2 / (CaO+Li2O) can be limited to be greater than or equal to 7.45. Preferably, the range of the weight percentage ratio C1=SiO2 / (CaO+Li2O) can be limited to be greater than or equal to 8.25. Preferably, the range of the weight percentage ratio C1=SiO2 / (CaO+Li2O) can be limited to 8.25-12.30. More preferably, the range of the weight percentage ratio C1=SiO2 / (CaO+Li2O) can be limited to 8.30-11.60.
[0050] In order to control the crystallization, density and oxygen-aluminum ratio of glass, Al 3+ The demand of ions for free oxygen prompts more aluminum ions to form aluminum oxide tetrahedrons, thereby strengthening the glass network structure, improving glass properties, and inhibiting glass crystallization. In the glass fiber composition of the present application, the weight percentage ratio C2 = (R2O + SrO) / Al2O3 is limited to a range of greater than or equal to 0.012. Preferably, the weight percentage ratio C2 = (R2O + SrO) / Al2O3 can be limited to a range of greater than or equal to 0.015-0.10. Preferably, the weight percentage ratio C2 = (R2O + SrO) / Al2O3 can be limited to a range of 0.02-0.085. More preferably, the weight percentage ratio C2 = (R2O + SrO) / Al2O3 can be limited to a range of 0.02-0.065.
[0051] In order to improve glass properties and control glass crystallization, in the glass fiber composition of the present application, the range of the weight percentage ratio C3=(MgO+SrO) / CaO is limited to be greater than or equal to 1.22. Preferably, the range of the weight percentage ratio C3=(MgO+SrO) / CaO can be limited to be greater than or equal to 1.30. Preferably, the range of the weight percentage ratio C3=(MgO+SrO) / CaO can be limited to be greater than or equal to 1.40. Preferably, the range of the weight percentage ratio C3=(MgO+SrO) / CaO can be limited to be greater than 1.50. More preferably, the range of the weight percentage ratio C3=(MgO+SrO) / CaO can be limited to be greater than 1.50 and less than or equal to 2.50.
[0052] Furthermore, in the glass fiber composition of the present application, the weight percentage ratio C4=SiO2 / (Al2O3+Li2O) can be limited to a range greater than or equal to 2.60. Preferably, the weight percentage ratio C4=SiO2 / (Al2O3+Li2O) can be limited to a range greater than or equal to 2.64. Preferably, the weight percentage ratio C4=SiO2 / (Al2O3+Li2O) can be limited to a range greater than or equal to 2.74. More preferably, the weight percentage ratio C4=SiO2 / (Al2O3+Li2O) can be limited to a range greater than or equal to 2.80.
[0053] Furthermore, in the glass fiber composition of the present application, the weight percentage ratio C5=(SiO2+Al2O3) / (CaO+R2O) can be limited to a range of greater than or equal to 8.8. Preferably, the weight percentage ratio C5=(SiO2+Al2O3) / (CaO+R2O) can be limited to a range of greater than or equal to 9.4. Preferably, the weight percentage ratio C5=(SiO2+Al2O3) / (CaO+R2O) can be limited to a range of 9.8-15.0. More preferably, the weight percentage ratio C5=(SiO2+Al2O3) / (CaO+R2O) can be limited to a range of 10.3-14.5.
[0054] Furthermore, in the glass fiber composition of the present application, the weight percentage ratio C6 = (Na2O + K2O) / R2O can be limited to a range of greater than or equal to 0.40. Preferably, the weight percentage ratio C6 = (Na2O + K2O) / R2O can be limited to a range of greater than or equal to 0.50. More preferably, the weight percentage ratio C6 = (Na2O + K2O) / R2O can be limited to a range of greater than or equal to 0.55.
[0055] Furthermore, in the glass fiber composition of the present application, the weight percentage content of CaO+MgO+RO can be limited to less than or equal to 20.3%. Preferably, the weight percentage content of CaO+MgO+RO can be limited to less than or equal to 19.6%. Preferably, the weight percentage content of CaO+MgO+RO can be limited to less than or equal to 19.2%. More preferably, the weight percentage content of CaO+MgO+RO can be limited to 16-19.2%.
[0056] Fe2O3 facilitates glass melting and improves glass crystallization. However, since ferric and ferrous ions have a coloring effect, their inclusion rate should be limited. Therefore, in the glass fiber composition of the present application, the Fe2O3 content is limited to a weight percentage range of 0.05-1%. Preferably, the Fe2O3 content can be limited to a weight percentage range of 0.05-0.75%. More preferably, the Fe2O3 content can be limited to a weight percentage range of 0.1-0.65%.
[0057] TiO2 not only reduces the viscosity of high-temperature glass but also has a certain fluxing effect. However, because titanium ions combined with iron ions have a certain coloring effect, which affects the appearance of glass fiber products, the content should not be too high. Therefore, in the glass fiber composition of the present application, the weight percentage range of TiO2 is limited to 0.01-2%. Preferably, the weight percentage range of TiO2 can be limited to 0.05-1.5%. More preferably, the weight percentage range of TiO2 can be limited to 0.05-0.7%.
[0058] In this application, an appropriate amount of B2O3 can be selectively introduced to further reduce the glass density and improve glass crystallization. In the glass fiber composition of this application, the weight percentage content range of B2O3 is limited to 0-2%. Preferably, the weight percentage content range of B2O3 can be limited to 0-1.5%. According to different technical requirements, in one technical solution, in order to improve the mechanical properties and chemical stability of the glass, the glass fiber composition of this application may be basically free of B2O3. In another technical solution, on the basis of ensuring performance, in order to further reduce the glass density, the weight percentage content range of B2O3 can be further limited to 0.1-1.5%.
[0059] In this application, an appropriate amount of ZrO2 may be selectively introduced to improve the chemical stability and heat resistance of the glass. In the glass fiber composition of this application, the weight percentage range of ZrO2 is limited to 0-2%. Preferably, the weight percentage range of ZrO2 can be limited to 0-1%. Depending on different technical requirements, in one technical solution, in order to control the glass density, the glass fiber composition of this application may be substantially free of ZrO2, but trace amounts of zirconium oxide introduced as impurities from the zirconium-containing refractory material are not excluded.
[0060] Moreover, the above components are the main components of this application, and their total weight percentage content is limited to be greater than or equal to 98.5%. Further, the total weight percentage content of the main components can be limited to be greater than or equal to 99%. Further, the total weight percentage content of the main components can be limited to be greater than or equal to 99.5%.
[0061] In addition to the above-mentioned main components, the glass fiber composition of the present application may also contain a small amount of other components, with a total weight percentage of less than 1.5%. Further, the glass fiber composition of the present application may include other components with a weight percentage content range of less than 1%. Further, the glass fiber composition of the present application may include other components with a weight percentage content range of less than 0.5%. Further, the glass fiber composition of the present application may also include F with a weight percentage content range of less than 0.5%. Generally, F is introduced into the glass raw materials as impurities.
[0062] Furthermore, in order to control production costs and glass density, the glass fiber composition of the present application may not contain rare earth oxides.
[0063] Furthermore, the glass density of the glass fiber composition of the present application can be controlled to be less than or equal to 2.61 g / cm 3 Preferably, the glass density of the composition is less than 2.60 g / cm 3 Preferably, the glass density of the composition is less than or equal to 2.59 g / cm 3 More preferably, the glass density of the composition is less than or equal to 2.58 g / cm 3 .
[0064] Furthermore, the glass fiber molding temperature of the glass fiber composition of the present application can be controlled to be less than or equal to 1360°C. Preferably, the glass fiber molding temperature of the composition is in the range of 1290-1360°C. Preferably, the glass fiber molding temperature of the composition is in the range of greater than 1300°C and less than or equal to 1360°C. More preferably, the glass fiber molding temperature of the composition is in the range of 1306-1355°C.
[0065] In the glass fiber composition of the present application, the beneficial effects of selecting the above-mentioned ranges of the content of each component will be described through specific experimental data given in the examples.
[0066] The following are examples of preferred value ranges for the various components included in the glass fiber composition according to the present application.
[0067] Preferred Example 1
[0068] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0069] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, and the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.30.
[0070] Preferred Example 2
[0071] The glass fiber composition according to the present application is composed of the following components, and the content of each component is expressed in weight percentage as follows:
[0072] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 7.05, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.22, and the weight percentage ratio C4 = SiO2 / (Al2O3+Li2O) is in the range of greater than or equal to 2.64.
[0073] Preferred Example 3
[0074] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0075] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, and the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.40.
[0076] Preferred Example 4
[0077] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0078] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, and the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than 1.50.
[0079] Preferred Example 5
[0080] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0081] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, and the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than 1.50.
[0082] Preferred Example 6
[0083] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0084] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 7.05, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.22, the weight percentage ratio C4 = SiO2 / (Al2O3+Li2O) is in the range of greater than or equal to 2.60, and the composition does not contain rare earth oxides.
[0085] Preferred Example 7
[0086] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0087] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than or equal to 1.40, the weight percentage ratio C4 = SiO2 / (Al2O3+Li2O) is in the range of greater than or equal to 2.60, and the total content of SiO2, Al2O3, MgO and CaO is less than 99%.
[0088] Preferred Example 8
[0089] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0090] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1=SiO2 / (CaO+Li2O) is in the range of greater than or equal to 7.05, the weight percentage ratio C2=(R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3=(MgO+SrO) / CaO is in the range of greater than or equal to 1.22, the weight percentage ratio C4=SiO2 / (Al2O3+Li2O) is in the range of greater than or equal to 2.60, and the glass density of the composition is less than 2.60 g / cm 3 .
[0091] Preferred Example Nine
[0092] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0093] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than 1.50, and the weight percentage ratio C4 = SiO2 / (Al2O3+Li2O) is in the range of greater than or equal to 2.74.
[0094] Preferred Example 10
[0095] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0096] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than 1.50, and the weight percentage ratio C4 = SiO2 / (Al2O3+Li2O) is in the range of greater than or equal to 2.74.
[0097] Preferred Example 11
[0098] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0099] The total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1 = SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2 = (R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3 = (MgO+SrO) / CaO is in the range of greater than 1.50, and the total content of SiO2, Al2O3, MgO and CaO is less than 99%.
[0100] Preferred Example 12
[0101] The glass fiber composition according to the present application contains the following components, and the content of each component is expressed in weight percentage as follows:
[0102] The total content of the above components is greater than or equal to 99%, the weight percentage ratio C1=SiO2 / (CaO+Li2O) is in the range of greater than or equal to 8.25, the weight percentage ratio C2=(R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, the weight percentage ratio C3=(MgO+SrO) / CaO is in the range of greater than 1.50, the weight percentage ratio C4=SiO2 / (Al2O3+Li2O) is in the range of greater than or equal to 2.74, and the total content of SiO2, Al2O3, MgO and CaO is less than 99%, and the glass density of the composition is less than 2.60 g / cm 3 . DETAILED DESCRIPTION
[0103] The technical solutions of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other in any way.
[0104] [Corrected 05.06.2023 according to Rule 91] The basic idea of the present application is that the contents of the components of the glass fiber composition, expressed in weight percentage, are as follows: SiO2 is 58.1-61.9%, Al2O3 is >19.8% and ≤23%, MgO is 9.6-12.7%, CaO is 4.1-7.9%, SrO+Li2O is 0.05-2.2%, SrO is 0-2%, Li2O is 0-0.39%, Na2O is 0.05-1.0%, R2O=Na2O+K2O+Li2O is 0.2-1.6%, Fe 2O3 is 0.05-1%, TiO2 is 0.01-2%, B2O3 is 0-2%, ZrO2 is 0-2%, SiO2+Al2O3 is 78-84%, and the total content of the above components is greater than or equal to 98.5%, the weight percentage ratio C1=SiO2 / (CaO+Li2O) is in the range of greater than or equal to 7.05, the weight percentage ratio C2=(R2O+SrO) / Al2O3 is in the range of greater than or equal to 0.012, and the weight percentage ratio C3=(MgO+SrO) / CaO is in the range of greater than or equal to 1.22. The glass fiber composition has the characteristics of low density and high modulus, higher specific modulus and specific strength, better lightweight level, and more cost advantages. It can also improve the glass crystallization temperature and rate, expand the glass fiber molding range, help reduce production difficulty and improve efficiency, and is suitable for large-scale tank kiln production of lightweight high-performance glass fiber.
[0105] The specific content values of SiO2, Al2O3, CaO, MgO, SrO, Na2O, K2O, Li2O, Fe2O3, TiO2, etc. in the glass fiber composition of this application are selected as examples and compared with the performance parameters of three comparative examples. In the comparison, seven performance parameters are selected:
[0106] (1) Molding temperature, corresponding to the glass melt with a viscosity of 10 3 The temperature at anchor.
[0107] (2) Liquidus temperature, which corresponds to the temperature at which crystal nuclei begin to form when the glass melt cools, that is, the upper limit temperature of glass crystallization.
[0108] (3) △T value, the difference between the forming temperature and the liquidus temperature, represents the temperature range of wire drawing. The larger the forming range, the more conducive it is to wire drawing.
[0109] (4) Glass modulus, which characterizes the ability of glass to resist elastic deformation, is tested according to ASTM E1876 standard for the elastic modulus of glass blocks.
[0110] (5) Glass density: This characterizes the specific gravity and lightweight level of glass. Glass density is tested according to ASTM C693.
[0111] (6) Specific modulus, calculated as the ratio of the modulus to the density of the glass, where 1 kg = 9.8 N. The larger the specific modulus, the greater the rigidity of the material and the better the lightweighting level.
[0112] (7) Crystalline phase composition characterizes the composition of the main crystal phases in glassy crystalline materials. XRD can be used to test and evaluate the crystalline materials. Among them, cordierite is abbreviated as COR, anorthite is abbreviated as ANO, enstatite is abbreviated as ENS, diopside is abbreviated as DIO, and wollastonite is abbreviated as WOL.
[0113] The above seven parameters and their determination methods are well known to those skilled in the art. Therefore, the above parameters can be used to effectively illustrate the performance of the glass fiber composition of the present application.
[0114] The experimental process is as follows: Each component can be obtained from appropriate raw materials, which are then mixed in proportion to achieve the desired final weight percentage. The mixed materials are then melted and clarified. The molten glass is then drawn through a nozzle on a drain plate to form glass fibers. The glass fibers are then drawn and wound onto the rotating head of a drawing machine to form raw fiber cakes or yarn balls. Of course, these glass fibers can be further processed using conventional methods to meet the desired requirements.
[0115] The following is a table comparing the performance parameters of the glass fiber compositions of the present application with those of the comparative examples. The content of the glass fiber compositions is expressed in weight percentage. It should be noted that the total content of the components in the examples is slightly less than 100%, which can be understood as the residual amount being trace impurities or a small amount of components that cannot be analyzed. Table 1A
[0116] Table 1B
[0117] Table 1C
[0118] Table 1D
[0119] From the specific values in the above table, it can be seen that compared with typical boron-free E glass (Comparative Example 1) and modified R glass (Comparative Examples 2 and 3), the glass fiber composition of the present application has the following advantages: (1) higher glass modulus; (2) lower glass density; (3) much higher specific modulus and lightweight level; (4) rich crystalline phase composition in the crystalline material, which is conducive to effectively suppressing glass crystallization and rate.
[0120] Compared with Comparative Example 3, the optional lithium oxide content in the glass fiber composition of the present application is lower, which is beneficial to cost reduction and industrial application.
[0121] It can be seen from this that the glass fiber composition of the present application has made breakthrough progress in density, modulus, specific modulus, crystallization control and low cost. The technical solution has better cost-effectiveness and lightweight level, is easy to realize large-scale pool kiln production, and has achieved unexpected technical effects.
[0122] The glass fiber composition according to the present application can be made into glass fibers having the above-mentioned excellent properties.
[0123] The glass fiber composition according to the present application can be combined with one or more organic and / or inorganic materials to prepare a composite material with excellent performance, for example, a glass fiber reinforced substrate, typical applications of which include wind blades, automotive products, high-pressure vessels, pipelines, etc.
[0124] Finally, it should be noted that in this document, the terms "comprises," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.
[0125] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the scope of protection of this application.
[0126] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they may modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents; and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of this application. Industrial Applicability
[0127] The glass fiber composition of this application has the characteristics of low density and high modulus, with higher specific modulus and specific strength, better lightweighting, and greater cost advantages. It also improves the glass crystallization temperature and rate, expands the glass fiber molding range, and helps reduce production difficulty and improve efficiency. It is suitable for large-scale tank kiln production of lightweight, high-performance glass fiber. This glass fiber composition can be combined with one or more organic and / or inorganic materials to produce high-performance composite materials, such as glass fiber-reinforced substrates. Typical applications include wind turbine blades, automotive products, high-pressure vessels, and pipelines.
Claims
1. High-performance, low-density glass fiber composition containing the following components expressed as percentage by weight: 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%, SrO0-2%, Li2O0-0.39%, Na2O 0.05-1.0%, R2O. -Na2O+K,O+Li,O0.2-1.6%Fe2O30.05-1%TiO20.01-2%B2O30-2%ZrO20-2%SiO2+Al2O378-84% where the total amount of the above components is greater than or equal to 98.5%; the percentage by weight of C1-SiO2 / (CaO+Li2O) is greater than or equal to 7.05; the percentage by weight of C2=(R2O+SrO) / Al2O3, 1. High-performance, low-density glass fiber composition according to claim 1 where the percentage by weight of C3=(MgO+srO) / CaO is greater than or equal to 0.012 and the percentage by weight of C3=(MgO+srO) / CaO is greater than or equal to 1.
222.
2. High-performance, low-density glass fiber composition according to claim 1 where the percentage by weight of C4-SiO2 / (Al2O3+Li2O) is greater than or equal to 2.
64.
3. High-performance, low-density glass fiber composition according to claim 1 where the percentage by weight of C5-(SiO2+Al2O3) / (CaO+R2O) is greater than or equal to 8.
84.
4. High-performance, low-density glass fiber composition according to claim 1 where the percentage by weight of CI-SiO2(CaO+Li2O) is greater than or equal to 8.
25. 5.
6. High-performance low-density glass fiber composition according to claim 1 where the weight percentage of C3=(MgO+SrO) / CaO is greater than 1.
50.
7. High-performance low-density glass fiber composition according to claim 1 where the weight percentage of CaO is 4.1%-6.9%.
8. High-performance low-density glass fiber composition according to claim 1 where the weight percentage of SrO is 0.05%-2%.
9. High-performance low-density glass fiber composition according to claim 1 that includes the following components expressed as weight percentages: SiO2 58.4-61.5%, Al2O3 >19.8% and less. or equal to 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 0.2-16%Fe2O 0.05-1%TiO2 0.01-2%B2O30-2%ZrO20-2%SiO2+Al2O378.3-84%CaO+MgO+R2O less than or equal to 20.3%, where the total amount of the above components is greater than or equal to 23%. Or equal to 98.5%; weight percentage C1=SiO2 / (CaO+Li2O) greater than or equal to 7.45, weight percentage C2=(R2O+SrO) / A12O3 greater than or equal to 0.012, weight percentage C3=(MgO+srO) / Cao greater than or equal to 1.30, and weight percentage C4-SiO,(Al.0,+Li.0) Greater than or equal to 2.
609. High-performance, low-density glass fiber composition according to claim 1, where the percentage by weight of Li2O is 0.01%-0.35%.
10. High-performance, low-density glass fiber composition according to claim 1, which includes the following components as shown. Percentage by weight: SiO2 58.1-61.9%, Al2O2 >19.8% and less than or equal to 23%, Mg, 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%, TiO2 0.01-2%, B2O3 0-2%, ZrO2 0-2%, SiO3+Al2O3 78-84%, where the total amount of all these components is... The total percentage of the above components is greater than or equal to 98.5%; the weight percentage of C1-SiO2 / (CaO+Li2O) is greater than or equal to 7.05%; the weight percentage of C2=(R2O+SrO) / A12O3 is greater than or equal to 0.012%; and the weight percentage of C3-(MgO+SrO) / CaO is greater than or equal to 1.22%.
11. High-performance low-density glass fiber composition according to claim 1 where the weight percentage of SiO2 is 58.4%-60.45%.
12. High-performance low-density glass fiber composition according to claim 1 where the weight percentage of A12O3 is greater than 19.8% and less than or equal to 20.45%. 13.High-performance, low-density glass fiber composition according to claim1, comprising the following components expressed as percentage by weight: SiO2 58.8-60.45%, Al2O3 >19.8% and greater than or equal to 23%, MgO 9.6-12.5%, CaO 4.1-6.9%, SrO+Li2O 0.05-2.2%, SrO0-2%, Li2O0-0.39%, Na2O 0.05- 1.0%R2O=Na2O+K2O+Li2O 0.2-1.35%Fe2O3 0.05-1%Fe,O,TiO2 0.01-2%B2O3 0-2%ZrO2 0-2%SiO2+Al2O3 >79% and less than or equal to 83.3%, where the total amount of the above components is greater than or equal to 98.5%; the percentage by weight C1=SiO2 / (CaO+Li2O) is greater than or equal to 8.25, the proportion 13. A high-performance, low-density glass fiber composition according to claim 1 where the total content of SiO2, A12O3, MgO, and CaO is less than 99%.
14. A high-performance, low-density glass fiber composition according to claim 1 which includes the following components expressed as percentages by weight: SiO2 58.8-60.45%, A12O3 >19.8% and less than or equal to 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%TiO2 0.01-2%B2O3 0-2%ZrO2 0-2%SiO2+A12O3 >79% and less than or equal to 83.3%CaO+MgO+R2O less than or equal to 19.6% where the total amount of the above components is greater than or equal to 98.5%; the percentage by weight of C1=SiO2 / (CaO+Li2O) is greater than or equal to 8.25, the percentage by weight of C2=(R2O+SrO / A12O3) is greater than or equal to 0.012, the percentage by weight of C3(MgO+SrO) / Cao is greater than or equal to 1.40 and the percentage by weight of C4-SiO2 / (AI2O3+Li2O) is greater than or equal to 2.7416.
17. High-performance, low-density glass fiber composite according to claim 1, where the composition is free of Li2O17.
18. High-performance, low-density glass fiber composite according to claim 1, where the composition is free of rare earth metal oxides.
19. High-performance, low-density glass fiber composite according to claim 1, where the glass density of the composition is less than 2.60 g / cm³.
20. Glass fibers prepared by any one of the glass fiber composites according to claims 1 to 18.
21. Composite materials incorporating glass fibers according to claim 19.