Glass fiber batch and method for making high modulus glass fibers using the same

Abstract

The application discloses a glass fiber batch and a method for preparing high modulus glass fiber by using the same. The glass fiber batch comprises the following raw materials in percentage by weight: 40.38-55.12% of silicon-aluminum powder, 20.70-31.90% of quartz sand, 4.89-8.90% of aluminum oxide, 0.94-2.41% of quicklime, 16.52-17.78% of magnesium oxide and 0.32-0.34% of cerium dioxide. The glass fiber batch has a low complete melting temperature when preparing the glass fiber, and can effectively reduce the energy consumption of preparing the glass fiber.

Description

Technical Field

[0001] This invention relates to the field of new glass materials technology, and in particular to a glass fiber compound and a method for preparing high-modulus glass fibers using the compound. Background Technology

[0002] High-modulus glass fiber has been widely used in various sectors of the national economy due to its lightweight, high strength, and corrosion resistance. Currently, high-modulus glass fiber has become an important basic material for a variety of products such as large wind turbine blades, optical cable reinforcing cores, aircraft cabins, and new energy vehicles.

[0003] Currently, the main system for high-modulus glass fibers is the MgO-Al2O3-SiO2 system. The most well-known MgO-Al2O3-SiO2 system is the American S-2 glass fiber. However, the S-2 glass fiber manufacturing process involves melting temperatures exceeding 1700℃ and forming temperatures exceeding 1500℃, resulting in high energy consumption and significant production difficulties, making large-scale production challenging. Therefore, this application proposes a glass fiber compound and a method for preparing high-modulus glass fibers using it. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a glass fiber compound and a method for preparing high-modulus glass fibers using the compound.

[0005] This invention is achieved through the following technical solution: A glass fiber compound, by weight percentage, comprises the following raw materials: 40.38%–55.12% silica-alumina micro powder, 20.70%–31.90% quartz sand, 4.89%–8.90% alumina, 0.94%–2.41% quicklime, 16.52%–17.78% magnesium oxide, and 0.32%–0.34% cerium dioxide. The high-modulus glass fiber system prepared using this glass fiber compound in this application is an MgO-Al₂O₃-SiO₂ system.

[0006] Preferably, the particle size range of the silicon-aluminum micro powder is 40~60μm, the particle size range of the quartz sand is 40~55μm, the particle size range of the aluminum oxide is 50~70μm, the particle size range of the quicklime is 43~55μm, the particle size range of the magnesium oxide is 38~55μm, and the particle size range of the cerium dioxide is 40~50μm.

[0007] Preferably, the silicon-aluminum micro powder used in this application is an existing silicon-aluminum micro powder, which is obtained by processing lithium slag using existing recycling processes.

[0008] Preferably, the loss on ignition of the silicon-aluminum micropowder is 5.67%, and the composition of the silicon-aluminum micropowder is expressed in elemental form, with each element accounting for the following weight percentages: 31.65% Si, 12.70% Al, 0.21% Li, 0.23% Na, 0.21% K, 0.70% Ca, 0.05% Mg, 0.38% Fe, and 48.20% O. When testing the composition of the silicon-aluminum micropowder in this application, the silicon-aluminum micropowder needs to be calcined first at a temperature of 1000℃ for 2 hours. After calcination, the weight and composition of the silicon-aluminum micropowder are tested and calculated. The results show that the loss on ignition of the silicon-aluminum micropowder raw material is 5.67%. The composition of the silicon-aluminum micropowder raw material is expressed in elemental form, and the weight percentage of each element is as follows: 31.65% Si, 12.70% Al, 0.21% Li, 0.23% Na, 0.21% K, 0.70% Ca, 0.05% Mg, 0.38% Fe, and 48.20% O. In addition, the silicon-aluminum micro powder raw material at room temperature is ground to about 10 μm. XRD test shows that the phase of the silicon-aluminum micro powder is mainly hydrothermal quartz, and it does not contain aluminum oxide crystals or other aluminum-containing crystals. This indicates that aluminum exists in the silicon-aluminum micro powder in an amorphous form.

[0009] In this application, the weight percentage of silica-alumina powder in the glass fiber compound has a significant impact on the melting process of the glass fiber compound. For example, when the weight percentage of silica-alumina powder in the glass fiber compound is less than 40.38%, the content of Si, Al, and Mg elements contained in the silica-alumina powder is relatively low. Therefore, it is necessary to use more quartz sand, alumina, and magnesium oxide raw materials to supplement it. However, the higher content of quartz sand, alumina, and magnesium oxide raw materials in the glass fiber compound will easily form refractory cordierite crystals during the melting and heating process of the glass fiber compound. During the process of cordierite crystal formation, some magnesium oxide raw materials are consumed, which reduces the content of magnesium oxide that can act as a flux during the melting of glass fiber compound. This leads to increased melting difficulty of glass fiber compound and higher complete melting temperature. When the weight percentage of silica-alumina micropowder in glass fiber compound exceeds 55.12%, the content of alkali metal elements (such as Li, Na, and K) in glass fiber compound will be too high. Excessive alkali metal elements will adversely affect the chemical stability of high-modulus glass fibers prepared using glass fiber compound.

[0010] Quartz sand's main component is SiO2, with a purity of 99%, and it is characterized by a high melting point. When the weight percentage of quartz sand in the glass fiber compound is less than 20.70%,... When the weight percentage of silica sand in the glass fiber compound exceeds 31.90%, more silica-alumina powder is needed to supplement the Si element. However, more silica-alumina powder will contain more alkali metal elements (such as Li, Na, and K). Excessive alkali metal content will lead to a decrease in the chemical stability of high-modulus glass fibers prepared using glass fiber compounds. When the weight percentage of silica sand in the glass fiber compound exceeds 31.90%, only a small amount of silica-alumina powder is needed to supplement the Si element. A small amount of silica-alumina powder means that the silica-alumina powder provides less Al and Mg, which requires more alumina and magnesia raw materials to supplement. At this time, more quartz sand, alumina, and magnesia raw materials will easily form refractory cordierite crystals during the melting and heating process of the glass fiber compound. Since some of the magnesia raw material is consumed in the process of cordierite crystal formation, the content of magnesia that can play a fluxing role in the melting process of the glass fiber compound is reduced, which in turn increases the melting difficulty of the glass fiber compound, leading to an increase in the complete melting temperature of the glass fiber compound and thus the problem of high energy consumption in the melting process of the glass fiber compound.

[0011] Aluminum oxide (A₂O₃) is a high-melting-point oxide with a purity of 98%. When the weight percentage of A₂O₃ in the glass fiber compound is less than 4.89%, more aluminosilicate powder is needed to supplement the Al element. However, more aluminosilicate powder will contain more alkali metal elements (such as Li, Na, and K). Excessive alkali metal content will lead to a decrease in the chemical stability of the high-modulus glass fibers prepared from the glass fiber compound. Conversely, when the weight percentage of A₂O₃ in the glass fiber compound exceeds 8.90%, only a small amount of aluminosilicate powder is needed to supplement the Al element. A small amount of aluminosilicate powder means that the aluminosilicate powder... The micronized powder provides less Si and Mg, requiring more quartz sand and magnesium oxide raw materials to supplement it. At this time, the increased amount of quartz sand, alumina, and magnesium oxide raw materials will easily form refractory cordierite crystals during the melting and heating process of the glass fiber compound. Since some magnesium oxide raw materials are consumed during the formation of cordierite crystals, the content of magnesium oxide that can play a fluxing role in the melting process of the glass fiber compound is reduced, which in turn increases the difficulty of melting the glass fiber compound, leading to a higher complete melting temperature of the glass fiber compound and thus high energy consumption in the melting process of the glass fiber compound.

[0012] The main component of quicklime is CaO, with a purity of 99%. It is a modified oxide that can promote the melting of glass fiber batches. When the weight percentage of quicklime in the glass fiber batch is less than 0.94%, the fluxing effect is weak. When the weight percentage of quicklime in the glass fiber batch exceeds 2.41%, the viscosity of the glass melt prepared in step S1 is low (the temperature of the glass melt belongs to the high-temperature zone). This also means that the temperature corresponding to a viscosity of 100 Pa·s (which also belongs to the high-temperature zone), i.e., the wire drawing temperature, will also decrease. Consequently, the difference between the wire drawing temperature and the liquidus temperature becomes smaller, ultimately leading to the easy precipitation of cordierite crystals during the glass fiber wire drawing process.

[0013] Magnesium oxide is a modified oxide with a purity of 98%. Its role is to promote the melting of glass fiber compound. When the weight percentage of magnesium oxide in the glass fiber compound is less than 16.52%, the fluxing effect is weak. When the weight percentage of magnesium oxide in the glass fiber compound exceeds 17.78%, the viscosity of the glass melt prepared in step S1 is low (the temperature of the glass melt is in the high-temperature range). This also means that the temperature at which the viscosity is 100 Pa·s (which is also in the high-temperature range), i.e., the wire drawing temperature, will also decrease. Consequently, the difference between the wire drawing temperature and the liquidus temperature becomes smaller, which ultimately leads to the easy precipitation of cordierite crystals during the glass fiber wire drawing process.

[0014] Cerium dioxide is a common clarifying agent in the glass industry, and its optimal content is closely related to factors such as the type of glass system, the type of raw materials, and the particle size of the glass fiber compound. In this application, the optimal weight percentage of cerium dioxide in the glass fiber compound is between 0.32% and 0.34%. When the mass percentage of cerium dioxide in the glass fiber compound is less than 0.32%, the clarifying effect of the glass melt prepared in step S1 is not obvious. Specifically, during the melting process of the glass fiber compound, the cerium dioxide in the glass fiber compound generates fewer bubbles, and the bubbles trapped in the glass melt (the main source of the bubbles trapped in the glass melt is the gas between the raw materials) are difficult to completely expel from the glass melt with the help of the bubbles generated by cerium dioxide. On the other hand, when the mass percentage of cerium dioxide in the glass fiber compound is higher than 0.34%, the cerium dioxide itself generates more bubbles during the melting process of the glass fiber compound, which also makes it difficult for the bubbles in the glass melt to be completely expelled from the glass melt.

[0015] Preferably, the glass fiber compound comprises, by mole percentage, 20.29 mol%–20.56 mol% Si, 7.26 mol%–7.55 mol% Al, 0.36 mol%–0.91 mol% Ca, 8.45 mol%–9.13 mol% Mg, 0.51 mol%–0.71 mol% R, 0.08 mol%–0.10 mol% Fe, 0.04 mol%–0.04 mol% Ce, and 61.84 mol%–62.04 mol% O, wherein R is an alkali metal element, and R includes one or more of Li, Na, and K.

[0016] Preferably, the molar percentage content of Si is 20.45 mol% to 20.52 mol%.

[0017] Preferably, the molar percentage content of Al is 7.36 mol% to 7.46 mol%.

[0018] Preferably, the molar percentage content of Ca is 0.50 mol% to 0.80 mol%.

[0019] Preferably, the molar percentage content of Mg is 8.52 mol% to 9.00 mol%.

[0020] Preferably, the molar percentage content of the alkali metal element R is 0.55 mol% to 0.62 mol%.

[0021] Preferably, the molar percentage content of Fe is 0.08 mol% to 0.09 mol%.

[0022] Preferably, the molar percentage content of Ce is 0.04 mol%.

[0023] Preferably, the molar percentage content of O is 61.95 mol% to 62.02 mol%.

[0024] A method for preparing high-modulus glass fibers using glass fiber compound, wherein the glass fiber compound is as described above, and the method for preparing high-modulus glass fibers using glass fiber compound includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated and kept at a constant temperature to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. Slowly cool the glass melt prepared in step S1 to the temperature at which the viscosity is 100 Pa·s, and draw it into fibers to obtain high modulus glass fibers. S3. Coat the high-modulus glass fiber with a sizing agent, and then wind the sizing agent-coated glass fiber to obtain the high-modulus glass fiber filament product.

[0025] Preferably, a method for preparing high-modulus glass fibers using glass fiber compounding specifically includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1600℃~1610℃ and kept at 1600℃~1610℃ for 20~25 h to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The glass melt prepared in step S2 is drawn into fibers at 1345℃~1365℃ to obtain high modulus glass fibers. S3. Coat the high-modulus glass fiber with a sizing agent, and then wind the sizing agent-coated glass fiber using a winding spool to obtain the high-modulus glass fiber filament product.

[0026] Compared with the prior art, the beneficial technical effects of this application are as follows: The aluminosilicate micropowder used in this application does not undergo a solid-phase reaction during the melting and heating process of the glass fiber compound in step S1 because the glass fiber compound itself does not contain aluminum oxide crystals or other aluminum-containing crystals. Therefore, no cordierite crystals are formed. Furthermore, the proportions of each raw material in this application are rationally designed, thus preventing the formation of refractory cordierite crystals during the melting and heating process of the glass fiber compound. Moreover, since the magnesium oxide in the glass fiber compound is not consumed due to the formation of cordierite crystals, it plays a better fluxing role during the melting process. This allows the glass fiber compound of this application, using aluminosilicate micropowder as the main raw material, to only require... A lower melting temperature is required to achieve complete melting of the glass fiber compound, resulting in a uniform and bubble-free molten glass. In other words, this application requires only lower energy consumption while obtaining a uniform and bubble-free molten glass. Tests show that the complete melting temperature of the glass fiber compound described in this application is 1480–1530°C. Furthermore, because the melting temperature of the glass fiber compound in step S1 is relatively low, it can melt completely more quickly. The molten glass obtained after complete melting will begin the clarification process after the complete melting process ends. That is, the lower the melting temperature, the earlier the molten glass can enter the clarification process. When the number of bubbles generated during the melting process is the same, the earlier the clarification process begins, the faster a uniform and bubble-free molten glass can be obtained.

[0027] Furthermore, the high-modulus glass fiber prepared from the glass fiber compound described in this application has an elastic modulus as high as 95.07 to 96.80 GPa, and the preparation process is simple. Therefore, the method for preparing high-modulus glass fiber using glass fiber compound described in this application is very suitable for large-scale production of high-modulus glass fiber. Attached Figure Description

[0028] Figure 1 The image shows the X-ray diffraction pattern of the silica-alumina micropowder. Detailed Implementation

[0029] The following specific embodiments further illustrate a glass fiber compound of the present invention.

[0030] Example 1: A glass fiber compound, by weight percentage, comprises: 40.38 kg of silica-alumina micro powder, 31.90 kg of quartz sand, 8.90 kg of alumina, 0.94 kg of quicklime, 17.56 kg of magnesium oxide and 0.32 kg of cerium dioxide, as shown in Table 1; The glass fiber compound in Example 1, by molar percentage, comprises the following elements: 20.48 mol% Si, 7.54 mol% Al, 0.36 mol% Ca, 8.94 mol% Mg, 0.25 mol% Li, 0.08 mol% Na, 0.18 mol% K, 0.08 mol% Fe, 0.04 mol% Ce, and 62.04 mol% O.

[0031] A method for preparing high-modulus glass fibers using glass fiber compounding materials includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1600℃ and kept at 1600℃ for 20 h to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1365°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0032] test: (1) The complete melting temperature of the glass fiber compound described in Example 1 was tested, and the test process is as follows: Since the process described in step S1 of this application is carried out in an electric melting furnace, which does not provide the conditions for sampling and testing, this application conducts alternative tests in the laboratory based on the process described in step S1 of this application. This alternative testing method is a commonly used testing method by those skilled in the art. For example, the paper P. Hrma, J. Marcial, KJSwearingen, SH Henager, MJ Schweiger, NE TeGrotenhuis, Conversion of batch to molten glass, II: dissolution of quartz particles, J. Non-Crys. Solid. 357 (2011) 820–828. is based on this alternative testing method to test the melting behavior of high alumina borosilicate glass batches. An alternative test method for testing the complete melting temperature of the glass fiber compound described in Example 1 in this application is as follows: Take 50g of the glass fiber compound described in Example 1 and place it in a corundum crucible, then place the corundum crucible in a high-temperature furnace and raise the temperature to a given temperature T at a rate of 5°C / minute. x Then, the corundum crucible is removed from the high-temperature furnace and rapidly placed in cold water to cool to room temperature. The phase composition of the glass fiber compound at this point is obtained by XRD testing until no crystals can be detected by XRD testing. The temperature at which the crystals completely melt is the complete melting temperature of the glass fiber compound described in Example 1; wherein, a given temperature T x It starts at 1300℃ and gradually increases in 10℃ increments, given a temperature T. x This can be expressed by the following expression: Given temperature T x =1300℃+10℃×n, where n is an integer greater than or equal to 1.

[0033] The complete melting temperature of the glass fiber compound described in Example 1 was tested and found to be 1530℃, as shown in Table 2.

[0034] (2) To verify whether cordierite crystals are generated in the glass fiber compound in step S1 of Example 1 during the heating process to 1600°C, this application specifically selected to test the glass fiber compound at any two temperatures between room temperature and 1600°C. Since the melting point of cordierite crystals is approximately 1460°C, this means that at any temperature below 1460°C, as long as the glass fiber compound described in step S1 of Example 1 itself contains cordierite crystals or cordierite crystals are generated during the heating process in step S1, cordierite crystals can be detected when testing the glass fiber compound. Therefore, this application selected to test the glass fiber compound at two temperatures: 1300°C and 1450°C. The specific testing process is as follows: In this application, 50g of the glass fiber compound described in Example 1 is placed in an alumina crucible. Then, the alumina crucible is placed in a high-temperature furnace and heated, and the temperature is increased from room temperature to 1300°C at a rate of 5°C / minute. Then, the alumina crucible is taken out and quickly placed in cold water to cool to room temperature. Then, the phase of the glass fiber compound at this time is obtained by XRD test. In this application, 50g of the glass fiber compound described in Example 1 is placed in an alumina crucible. The alumina crucible is then placed in a high-temperature furnace and heated at a rate of 5°C / minute from room temperature to 1450°C. The alumina crucible is then removed and quickly placed in cold water to cool to room temperature. The phase composition of the glass fiber compound at this point is then obtained by XRD testing.

[0035] Tests show that when the glass fiber compound described in Example 1 of this application is heated to 1300℃ and 1450℃, hydrothermal quartz is present, but cordierite crystals are absent, as shown in Table 2. The reason is as follows: At room temperature, the phase of the aluminosilicate powder is mainly hydrothermal quartz, and it does not contain alumina crystals or other aluminum-containing crystals (such as...). Figure 1 As shown in the figure, this indicates that aluminum exists in an amorphous form in the aluminosilicate powder. Therefore, during the melting and heating process of the glass fiber compound, the aluminosilicate powder will not undergo a solid-phase reaction to form cordierite crystals, but only hydrothermal quartz. Furthermore, this demonstrates that the compounding of each raw material in this application is reasonably designed; therefore, during the melting and heating process of the glass fiber compound, the formation of refractory cordierite crystals in the glass fiber compound does not occur. Simultaneously, the above test results also indicate that no cordierite crystals are formed in the glass fiber compound in step S1 of Example 1, nor in the glass fiber compound during the heating process to 1600℃.

[0036] (3) In order to verify whether the glass melt prepared in step S1 of this application can be drawn into wire, this application specifically conducted the following alternative test, for the same reason as above: In the laboratory, 200g of the glass fiber compound material described in Example 1 was prepared into a uniform glass melt without bubbles according to the process described in step S1. Then, the temperature of the glass melt with a viscosity of 100 Pa·s was tested using a high-temperature viscometer. This temperature is the wire drawing temperature. In addition, the temperature at which the crystal nuclei begin to form under steady-state conditions during the cooling process of the glass melt, i.e., the liquidus temperature, was also tested.

[0037] The test results show that the glass fiber compound described in Example 1 has a drawing temperature of 1365°C and a liquidus temperature of 1314°C. When the liquidus temperature is 51°C lower than the drawing temperature (in actual operation, when the liquidus temperature is at least 50°C lower than the drawing temperature, the glass melt meets the requirements for the drawing process), this indicates that the glass melt prepared in step S1 can meet the requirements for the drawing process.

[0038] (4) In order to characterize the ability of the glass fiber prepared in step S2 of Example 1 to resist elastic deformation, this application needs to test the elastic modulus of the glass fiber. However, since the data of the glass fiber test is not accurate enough, the art usually adopts an alternative test method. The alternative test method is as follows. This alternative test method is a commonly used test method by those skilled in the art. For example, in patent CN 111807707 A, a high modulus glass fiber composition and its glass fiber and composite material, the elastic modulus of the glass fiber is tested based on this alternative test method. In the laboratory, 300g of the glass fiber compound material described in Example 1 is prepared into a uniform bubble-free glass liquid according to the process described in step S1. Then, the glass liquid obtained above is poured into a mold to obtain a block glass. Then, under the condition of glass transition temperature, after annealing for 2 hours, it is cooled to room temperature to obtain a block glass test sample. Then, the elastic modulus of the block glass test sample is tested according to the ASTM E1876 standard.

[0039] The test results show that the elastic modulus of the high-modulus glass fiber prepared by the glass fiber compound described in Example 1 is 95.62 GPa. In other words, the glass fiber prepared in Example 1 of this application is a high-modulus glass fiber.

[0040] (5) In order to understand the density of the glass fiber prepared in step S2 of Example 1, this application needs to test the density of the glass fiber prepared in step S2 of Example 1. However, since the data of glass fiber testing is not accurate enough, alternative methods are usually used in the field. The alternative testing method is as follows: In the laboratory, 50g of the glass fiber batch material described in Example 1 is prepared into a uniform and bubble-free glass liquid according to the process described in step S1. Then, the glass liquid is poured into a mold at room temperature to obtain a block glass with a thickness of 2mm. Then, the block glass is naturally cooled to room temperature in the air to obtain a density test sample. Then, the density of the density test sample is tested.

[0041] Tests show that the density of the high-modulus glass fiber prepared from the glass fiber compound described in Example 1 is 2.580 g·cm³. -3 .

[0042] Table 1 silicon-aluminum micro powder / Kg 40.38 44.24 42.33 44.27 53.92 53.14 53.16 42.25 55.12 0.00 Quartz sand / Kg 31.90 29.09 30.49 29.07 21.58 22.14 22.13 30.55 20.70 59.80 Aluminum oxide / Kg 8.90 7.90 7.90 7.40 4.91 5.41 4.91 7.92 4.89 18.83 quicklime / Kg 0.94 1.91 2.41 1.91 1.89 1.60 1.70 2.11 1.50 1.59 Magnesium oxide / Kg 17.56 16.52 16.55 17.02 17.38 17.39 17.78 16.85 17.46 17.93 Cerium dioxide / Kg 0.32 0.34 0.32 0.32 0.32 0.32 0.32 0.32 0.32 0.32 Lithium carbonate / Kg - - - - - - - - - 0.50 Soda ash / Kg - - - - - - - - - 0.24 Potassium carbonate / Kg - - - - - - - - - 0.64 Ferric oxide / Kg - - - - - - - - - 0.15

[0043] Table 2 Test results for each embodiment Phase at 1300℃ hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz cristobalite crystals, cordierite crystals Phase at 1450℃ hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz hydrothermal quartz cristobalite crystals, cordierite crystals Complete melting temperature / °C 1530 1500 1500 1510 1480 1490 1490 1500 1490 1610 Wire drawing temperature / ℃ 1365 1362 1362 1363 1345 1357 1352 1362 1348 1349 Liquidus temperature / ℃ 1314 1306 1312 1312 1295 1306 1300 1310 1296 1297 Elastic modulus / GPa 95.62 95.30 95.11 95.07 96.8 96.36 96.50 95.20 96.12 96.11 <![CDATA[Density / g·cm -3 > 2.580 2.581 2.582 2.581 2.590 2.590 2.585 2.583 2.586 2.586

[0044] Example 2: A glass fiber compound, by weight percentage, comprises: 44.24 kg of silica-alumina micro powder, 29.09 kg of quartz sand, 7.90 kg of alumina, 1.91 kg of quicklime, 16.52 kg of magnesium oxide and 0.34 kg of cerium dioxide, as shown in Table 1.

[0045] The glass fiber compound in Example 2, by molar percentage, comprises the following elements: 20.51 mol% Si, 7.55 mol% Al, 0.72 mol% Ca, 8.45 mol% Mg, 0.31 mol% Li, 0.10 mol% Na, 0.21 mol% K, 0.09 mol% Fe, 0.04 mol% Ce, and 62.03 mol% O.

[0046] A method for preparing high-modulus glass fibers using glass fiber compounding materials includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1605℃ and kept at 1605℃ for 23 hours to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1362°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0047] Testing: The testing method in Example 2 is exactly the same as that in Example 1. The only difference is that the testing process in Example 1 is based on the glass fiber compound described in Example 1; the testing process in Example 2 is based on the glass fiber compound described in Example 2. The test results are shown in Table 2.

[0048] From Table 2, it can be seen that: (1) the complete melting temperature of the glass fiber compound described in Example 2 is 1500℃; (2) when the glass fiber compound described in Example 2 of this application is heated to 1300℃ and 1450℃, hydrothermal quartz is present and cordierite crystals are not present. This indicates that cordierite crystals are not generated in the glass fiber compound in step S1 of Example 2 and in the process of heating to 1605℃; (3) the drawing temperature of the glass fiber compound described in Example 2 is 1362℃ and the liquidus temperature is 1306℃. When the liquidus temperature is 56℃ lower than the drawing temperature, it indicates that the glass liquid prepared in step S1 of Example 2 can meet the requirements of the subsequent drawing process; (4) the elastic modulus test result of the high modulus glass fiber prepared by the glass fiber compound described in Example 2 is 95.30GPa; (5) the density of the high modulus glass fiber prepared by the glass fiber compound described in Example 2 is 2.581g·cm³. -3 .

[0049] Example 3: A glass fiber compound, by weight percentage, comprises: 42.33 kg of silica-alumina micro powder, 30.49 kg of quartz sand, 7.90 kg of alumina, 2.41 kg of quicklime, 16.55 kg of magnesium oxide and 0.32 kg of cerium dioxide, as shown in Table 1.

[0050] The glass fiber compound in Example 3, by molar percentage, comprises the following elements: 20.56 mol% Si, 7.37 mol% Al, 0.91 mol% Ca, 8.47 mol% Mg, 0.27 mol% Li, 0.09 mol% Na, 0.18 mol% K, 0.09 mol% Fe, 0.04 mol% Ce, and 62.03 mol% O.

[0051] A method for preparing high-modulus glass fibers using glass fiber compounding materials includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1610℃ and kept at 1610℃ for 25 hours to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1362°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0052] Testing: The testing method in Example 3 is exactly the same as that in Example 1. The only difference is that the testing process in Example 1 is based on the glass fiber compound described in Example 1; the testing process in Example 3 is based on the glass fiber compound described in Example 3. The test results are shown in Table 2.

[0053] From Table 2, it can be seen that: (1) the complete melting temperature of the glass fiber compound described in Example 3 is 1500℃; (2) when the glass fiber compound described in Example 3 of this application is heated to 1300℃ and 1450℃, hydrothermal quartz is present and cordierite crystals are not present. This indicates that cordierite crystals are not generated in the glass fiber compound in step S1 of Example 3 and in the process of heating to 1610℃; (3) the drawing temperature of the glass fiber compound described in Example 3 is 1362℃ and the liquidus temperature is 1312℃. When the liquidus temperature is 50℃ lower than the drawing temperature, it indicates that the glass liquid prepared in step S1 of Example 3 can meet the requirements of the subsequent drawing process; (4) the elastic modulus test result of the high modulus glass fiber prepared by the glass fiber compound described in Example 3 is 95.11 GPa; (5) the density of the high modulus glass fiber prepared by the glass fiber compound described in Example 3 is 2.582 g·cm³. -3 .

[0054] Example 4: A glass fiber compound, by weight percentage, comprises: 44.27 kg of silica-alumina micro powder, 29.07 kg of quartz sand, 7.40 kg of alumina, 1.91 kg of quicklime, 17.02 kg of magnesium oxide and 0.32 kg of cerium dioxide, as shown in Table 1.

[0055] The glass fiber compound in Example 4, by molar percentage, comprises the following elements: 20.52 mol% Si, 7.36 mol% Al, 0.72 mol% Ca, 8.70 mol% Mg, 0.28 mol% Li, 0.09 mol% Na, 0.19 mol% K, 0.09 mol% Fe, 0.04 mol% Ce, and 62.00 mol% O.

[0056] A method for preparing high-modulus glass fibers using glass fiber compounding materials includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1607℃ and kept at 1607℃ for 22 hours to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1363°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0057] Testing: The testing method in Example 4 is exactly the same as that in Example 1. The only difference is that the testing process in Example 1 is based on the glass fiber compound described in Example 1; the testing process in Example 4 is based on the glass fiber compound described in Example 4. The test results are shown in Table 2.

[0058] From Table 2, it can be seen that: (1) The complete melting temperature of the glass fiber compound described in Example 4 is 1510℃; (2) When the glass fiber compound described in Example 4 of this application is heated to 1300℃ and 1450℃, hydrothermal quartz is present and cordierite crystals are not present. This indicates that cordierite crystals are not generated in the glass fiber compound in step S1 of Example 4 and in the process of heating to 1607℃; (3) The drawing temperature of the glass fiber compound described in Example 4 is 1363℃ and the liquidus temperature is 1312℃. When the liquidus temperature is 51℃ lower than the drawing temperature, it indicates that the glass liquid prepared in step S1 of Example 4 can meet the requirements of the subsequent drawing process; (4) The elastic modulus test result of the high modulus glass fiber prepared by the glass fiber compound described in Example 4 is 95.07GPa; (5) The density of the high modulus glass fiber prepared by the glass fiber compound described in Example 4 is 2.581g·cm³. -3 .

[0059] Example 5: A glass fiber compound, by weight percentage, comprises: 53.92 kg of silica-alumina micro powder, 21.58 kg of quartz sand, 4.91 kg of alumina, 1.89 kg of quicklime, 17.38 kg of magnesium oxide and 0.32 kg of cerium dioxide, as shown in Table 1.

[0060] The glass fiber compound in Example 5, by molar percentage, comprises the following elements: 20.31 mol% Si, 7.34 mol% Al, 0.72 mol% Ca, 8.94 mol% Mg, 0.34 mol% Li, 0.11 mol% Na, 0.24 mol% K, 0.10 mol% Fe, 0.04 mol% Ce, and 61.86 mol% O.

[0061] A method for preparing high-modulus glass fibers using glass fiber compounding materials includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1600℃ and kept at 1600℃ for 20 h to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1345°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0062] Testing: The testing method in Example 5 is exactly the same as that in Example 1. The only difference is that the testing process in Example 1 is based on the glass fiber compound described in Example 1; the testing process in Example 5 is based on the glass fiber compound described in Example 5. The test results are shown in Table 2.

[0063] From Table 2, it can be seen that: (1) the complete melting temperature of the glass fiber compound described in Example 5 is 1480℃; (2) when the glass fiber compound described in Example 5 of this application is heated to 1300℃ and 1450℃, hydrothermal quartz is present and cordierite crystals are not present. This indicates that cordierite crystals are not generated in the glass fiber compound in step S1 of Example 5 and in the process of heating to 1600℃; (3) the drawing temperature of the glass fiber compound described in Example 5 is 1345℃ and the liquidus temperature is 1295℃. When the liquidus temperature is 50℃ lower than the drawing temperature, it indicates that the glass liquid prepared in step S1 of Example 5 can meet the requirements of the subsequent drawing process; (4) the elastic modulus test result of the high modulus glass fiber prepared by the glass fiber compound described in Example 5 is 96.80 GPa; (5) the density of the high modulus glass fiber prepared by the glass fiber compound described in Example 5 is 2.590 g·cm³. -3 .

[0064] Example 6: A glass fiber compound, by weight percentage, comprises: 53.14 kg of silica-alumina micro powder, 22.14 kg of quartz sand, 5.41 kg of alumina, 1.60 kg of quicklime, 17.39 kg of magnesium oxide and 0.32 kg of cerium dioxide, as shown in Table 1.

[0065] The glass fiber compound in Example 6 comprises, by molar percentage, the following elements: 20.29 mol% Si, 7.46 mol% Al, 0.61 mol% Ca, 8.93 mol% Mg, 0.35 mol% Li, 0.12 mol% Na, 0.24 mol% K, 0.10 mol% Fe, 0.04 mol% Ce, and 61.87 mol% O.

[0066] A method for preparing high-modulus glass fibers using glass fiber compounding materials includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1600℃ and kept at 1600℃ for 20 h to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1357°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0067] Testing: The testing method in Example 6 is exactly the same as that in Example 1. The only difference is that the testing process in Example 1 is based on the glass fiber compound described in Example 1; the testing process in Example 6 is based on the glass fiber compound described in Example 6. The test results are shown in Table 2.

[0068] From Table 2, it can be seen that: (1) the complete melting temperature of the glass fiber compound described in Example 6 is 1490℃; (2) when the glass fiber compound described in Example 6 of this application is heated to 1300℃ and 1450℃, hydrothermal quartz is present and cordierite crystals are not present. This indicates that cordierite crystals are not generated in the glass fiber compound in step S1 of Example 6 and in the process of heating to 1600℃; (3) the drawing temperature of the glass fiber compound described in Example 6 is 1357℃ and the liquidus temperature is 1306℃. When the liquidus temperature is 51℃ lower than the drawing temperature, it indicates that the glass liquid prepared in step S1 of Example 6 can meet the requirements of the subsequent drawing process; (4) the elastic modulus test result of the high modulus glass fiber prepared by the glass fiber compound described in Example 6 is 96.36GPa; (5) the density of the high modulus glass fiber prepared by the glass fiber compound described in Example 6 is 2.590g·cm³. -3 .

[0069] Example 7: A glass fiber compound, by weight percentage, comprises: 53.16 kg of silica-alumina micro powder, 22.13 kg of quartz sand, 4.91 kg of alumina, 1.70 kg of quicklime, 17.78 kg of magnesium oxide and 0.32 kg of cerium dioxide, as shown in Table 1.

[0070] The glass fiber compound in Example 7 comprises, by molar percentage, the following elements: 20.30 mol% Si, 7.26 mol% Al, 0.65 mol% Ca, 9.13 mol% Mg, 0.34 mol% Li, 0.11 mol% Na, 0.23 mol% K, 0.09 mol% Fe, 0.04 mol% Ce, and 61.84 mol% O.

[0071] A method for preparing high-modulus glass fibers using glass fiber compounding materials includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1600℃ and kept at 1600℃ for 20 h to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1352°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0072] Testing: The testing method in Example 7 is exactly the same as that in Example 1. The only difference is that the testing process in Example 1 is based on the glass fiber compound described in Example 1, while the testing process in Example 7 is based on the glass fiber compound described in Example 7. The test results are shown in Table 2.

[0073] From Table 2, it can be seen that: (1) the complete melting temperature of the glass fiber compound described in Example 7 is 1490℃; (2) when the glass fiber compound described in Example 7 of this application is heated to 1300℃ and 1450℃, hydrothermal quartz is present and cordierite crystals are not present. This indicates that cordierite crystals are not generated in the glass fiber compound in step S1 of Example 7 and in the process of heating to 1600℃; (3) the drawing temperature of the glass fiber compound described in Example 7 is 1352℃ and the liquidus temperature is 1300℃. When the liquidus temperature is 52℃ lower than the drawing temperature, it indicates that the glass liquid prepared in step S1 of Example 7 can meet the requirements of the subsequent drawing process; (4) the elastic modulus test result of the high modulus glass fiber prepared by the glass fiber compound described in Example 7 is 96.50 GPa; (5) the density of the high modulus glass fiber prepared by the glass fiber compound described in Example 7 is 2.585 g·cm³. -3 .

[0074] Example 8: A glass fiber compound, by weight percentage, comprises: 42.25 kg of silica-alumina micro powder, 30.55 kg of quartz sand, 7.92 kg of alumina, 2.11 kg of quicklime, 16.85 kg of magnesium oxide and 0.32 kg of cerium dioxide, as shown in Table 1.

[0075] The glass fiber compound in Example 8 comprises, by molar percentage, the following elements: 20.49 mol% Si, 7.35 mol% Al, 0.79 mol% Ca, 8.59 mol% Mg, 0.34 mol% Li, 0.11 mol% Na, 0.24 mol% K, 0.10 mol% Fe, 0.04 mol% Ce, and 61.95 mol% O.

[0076] A method for preparing high-modulus glass fibers using glass fiber compounding materials includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1605℃ and kept at 1605℃ for 23 hours to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1362°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0077] Testing: The testing method in Example 8 is exactly the same as that in Example 1. The only difference is that the testing process in Example 1 is based on the glass fiber compound described in Example 1; the testing process in Example 8 is based on the glass fiber compound described in Example 8. The test results are shown in Table 2.

[0078] From Table 2, it can be seen that: (1) the complete melting temperature of the glass fiber compound described in Example 8 is 1500℃; (2) when the glass fiber compound described in Example 8 of this application is heated to 1300℃ and 1450℃, hydrothermal quartz is present and cordierite crystals are not present. This indicates that cordierite crystals are not generated in the glass fiber compound in step S1 of Example 8 and in the process of heating to 1605℃; (3) the drawing temperature of the glass fiber compound described in Example 8 is 1362℃ and the liquidus temperature is 1310℃. When the liquidus temperature is 52℃ lower than the drawing temperature, it indicates that the glass liquid prepared in step S1 of Example 8 can meet the requirements of the subsequent drawing process; (4) the elastic modulus test result of the high modulus glass fiber prepared by the glass fiber compound described in Example 8 is 95.20 GPa; (5) the density of the high modulus glass fiber prepared by the glass fiber compound described in Example 8 is 2.583 g·cm³. -3 .

[0079] Example 9: A glass fiber compound, by weight percentage, comprises: 55.12 kg of silica-alumina micro powder, 20.70 kg of quartz sand, 4.89 kg of alumina, 1.50 kg of quicklime, 17.46 kg of magnesium oxide and 0.32 kg of cerium dioxide, as shown in Table 1.

[0080] The glass fiber compound in Example 9, by molar percentage, comprises the following elements: 20.33 mol% Si, 7.47 mol% Al, 0.58 mol% Ca, 9.00 mol% Mg, 0.27 mol% Li, 0.09 mol% Na, 0.19 mol% K, 0.09 mol% Fe, 0.04 mol% Ce, and 61.94 mol% O.

[0081] A method for preparing high-modulus glass fibers using glass fiber compounding materials includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1600℃ and kept at 1600℃ for 20 h to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1348°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0082] Testing: The testing method of Example 9 is exactly the same as that of Example 1. The only difference is that the testing process in Example 1 is based on the glass fiber compound described in Example 1; the testing process in Example 9 is based on the glass fiber compound described in Example 9. The test results are shown in Table 2.

[0083] From Table 2, it can be seen that: (1) the complete melting temperature of the glass fiber compound described in Example 9 is 1490℃; (2) when the glass fiber compound described in Example 9 of this application is heated to 1300℃ and 1450℃, hydrothermal quartz is present and cordierite crystals are not present. This indicates that cordierite crystals are not generated in the glass fiber compound in step S1 of Example 9 and in the process of heating to 1600℃; (3) the drawing temperature of the glass fiber compound described in Example 9 is 1348℃ and the liquidus temperature is 1296℃. When the liquidus temperature is 52℃ lower than the drawing temperature, it indicates that the glass liquid prepared in step S1 of Example 9 can meet the requirements of the subsequent drawing process; (4) the elastic modulus test result of the high modulus glass fiber prepared by the glass fiber compound described in Example 9 is 96.12GPa; (5) the density of the high modulus glass fiber prepared by the glass fiber compound described in Example 9 is 2.586g·cm³. -3 .

[0084] Comparative example: The glass fiber compound in the comparative example of this application includes 59.80 kg of quartz sand, 18.83 kg of alumina, 1.59 kg of quicklime, 17.93 kg of magnesium oxide, 0.32 kg of cerium dioxide, 0.50 kg of lithium carbonate, 0.24 kg of soda ash, 0.64 kg of potassium carbonate, and 0.15 kg of ferric oxide. The glass fiber compound in the comparative example has the same chemical composition as the glass fiber compound in Example 9. That is, the glass fiber compound in the comparative example has the same molar percentage of elements as the glass fiber compound described in Example 9.

[0085] A method for preparing glass fibers using glass fiber compound in a comparative example includes the following steps: S1. After crushing and mixing the glass fiber compound in the comparative example, heat it to 1670℃ and keep it at 1670℃ for 52 h to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The molten glass prepared in step S2 is drawn into fibers at 1349°C to obtain high-modulus glass fibers. S3. Apply a sizing agent to the high-modulus glass fiber using an oiling device, and then wind the sizing agent-coated glass fiber using a winding bobbin to obtain the high-modulus glass fiber filament product.

[0086] Testing: The testing method for the comparative example is exactly the same as that for Example 1. The only difference is that the testing process in Example 1 is based on the glass fiber compound described in Example 1; the testing process in the comparative example is based on the glass fiber compound described in the comparative example. The test results are shown in Table 2.

[0087] As can be seen from Table 2: (1) The complete melting temperature of the glass fiber compound described in the comparative example is 1610℃; (2) When the glass fiber compound described in the comparative example of this application is heated to 1300℃ and 1450℃, cristobalite crystals and cordierite crystals are present; (3) The drawing temperature of the glass fiber compound described in the comparative example is 1349℃ and the liquidus temperature is 1297℃. When the liquidus temperature is 52℃ lower than the drawing temperature, it indicates that the glass liquid prepared in step S1 of the comparative example can meet the requirements of the subsequent drawing process; (4) The elastic modulus test result of the high modulus glass fiber prepared from the glass fiber compound described in the comparative example is 96.11 GPa; (5) The density of the high modulus glass fiber prepared from the glass fiber compound described in the comparative example is 2.586 g·cm³. -3 .

[0088] Obviously, the glass fiber compound of this application, which uses silica-alumina micro powder as the main raw material, can significantly reduce the glass melting temperature during the preparation of glass fibers compared with the traditional glass fiber compound of the comparative example, which uses quartz sand as the main raw material. The reduction in melting temperature is beneficial to improving the clarification effect.

[0089] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the embodiments of the present invention have been described in detail, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A glass fiber compound, characterized in that: By weight percentage, the glass fiber compound consists of the following raw materials: 40.38%–55.12% silica-alumina micro powder, 20.70%–31.90% quartz sand, 4.89%–8.90% alumina, 0.94%–2.41% quicklime, 16.52%–17.78% magnesium oxide, and 0.32%–0.34% cerium dioxide; The glass fiber compound, by molar percentage, comprises 20.29 mol%–20.56 mol% Si, 7.26 mol%–7.55 mol% Al, 0.36 mol%–0.91 mol% Ca, 8.45 mol%–9.13 mol% Mg, 0.51 mol%–0.71 mol% R, 0.08 mol%–0.10 mol% Fe, 0.04 mol% Ce, and 61.84 mol%–62.04 mol% O, wherein R is an alkali metal element, and R includes one or more of Li, Na, and K.

2. The glass fiber compound according to claim 1, characterized in that: The particle size ranges for silicon-aluminum micro powder (40–60 μm), quartz sand (40–55 μm), aluminum oxide (50–70 μm), quicklime (43–55 μm), magnesium oxide (38–55 μm), and cerium dioxide (40–50 μm).

3. The glass fiber compound according to claim 1, characterized in that: The loss on ignition of the silicon-aluminum micropowder raw material is 5.67%. The composition of the silicon-aluminum micropowder raw material is expressed in elemental form, and the weight percentage of each element is as follows: 31.65% Si, 12.70% Al, 0.21% Li, 0.23% Na, 0.21% K, 0.70% Ca, 0.05% Mg, 0.38% Fe and 48.20% O.

4. A method for preparing high-modulus glass fibers using glass fiber compound, characterized in that: The glass fiber compound is the glass fiber compound according to any one of claims 1 to 3, and the method for preparing high-modulus glass fiber using the glass fiber compound includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated and kept at a constant temperature to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The glass melt prepared in step S1 is drawn into fibers to obtain high modulus glass fibers; S3. Coat the high-modulus glass fiber with a sizing agent, and then wind the sizing agent-coated glass fiber to obtain the high-modulus glass fiber filament product.

5. The method for preparing high-modulus glass fibers using glass fiber compounding according to claim 4, characterized in that: The method for preparing high-modulus glass fibers using glass fiber compounding specifically includes the following steps: S1. After the glass fiber compound is mixed evenly, it is heated to 1600℃~1610℃ and kept at 1600℃~1610℃ for 20~25h to melt the glass fiber compound and obtain a uniform glass melt without bubbles. S2. The glass melt prepared in step S1 is drawn into fibers at 1345℃~1365℃ to obtain high modulus glass fibers. S3. Coat the high-modulus glass fiber with a sizing agent, and then wind the sizing agent-coated glass fiber using a winding spool to obtain the high-modulus glass fiber filament product.

6. A high-modulus glass fiber precursor product, characterized in that: The high-modulus glass fiber precursor product is prepared by the method for preparing high-modulus glass fiber using glass fiber compound as described in claim 4.

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