Electronic grade glass fiber composition, glass fiber cloth and method for preparing the same

Abstract

This invention belongs to the technical field of glass fiber compositions, specifically relating to an electronic-grade glass fiber composition, glass fiber cloth, and its preparation method. The electronic-grade glass fiber composition, by mass percentage, comprises the following components: SiO2: 52.7~64.1%; B2O3: 13.90~19.50%; Al2O3: 12.46~18.03%; SnO2: 0.42~1.51%; P2O5: 1.77~2.5%; CaO: 1.20~1.87%; MgO: 1.18~3.43%; F: 0.40~0.62%; Sm2O3: 0.40~1.60%; Yb2O3: 0.25~0.95%; GeO2: 0.22~0.90%; CaO+MgO≤5.3%. The glass fiber cloth prepared by this invention exhibits superior performance in terms of dielectric constant and dielectric loss.

Description

Technical Field

[0001] This invention belongs to the technical field of glass fiber compositions, specifically relating to an electronic-grade glass fiber composition, glass fiber cloth, and its preparation method. Background Technology

[0002] Fifth-generation wireless communication technology, or 5G for short, boasts advantages such as higher transmission rates, ultra-large network capacity, and millisecond-level ultra-short latency. Simultaneously, related 5G electronic components place higher performance demands on PCB substrates. As the circuit carrier for 5G electronic components, the PCB substrate is generally composed of resin, reinforcing materials (usually fiberglass cloth), and copper foil, laminated together. Among these, the low dielectric loss (D...) of the fiberglass cloth is crucial. f ) and low dielectric constant (D k The performance will directly affect the electrical performance of the PCB substrate, and thus affect the low loss and low latency performance of 5G / millimeter wave equipment signal transmission.

[0003] Chinese patent CN103153894A discloses a glass composition, which, by mass percentage, comprises the following components: SiO2: 53.5%~77%; B2O3: 4.5%~14.5%; MgO: 4%~12.5%; CaO: 0~10.5%; Li2O: 0~4%; Na2O: 0~2%; K2O: 0~1%; Fe2O3: 0~1%; F2: 0~2%; TiO2: 0~2%; and other components totaling 0~5%.

[0004] The patent features a molding window (T) P -T L The temperature should be greater than 55°C to avoid glass devitrification. However, in some embodiments, such as Embodiments 12 and 13, the forming window is small. The patented formula is not perfect, and in some cases, the processing and forming performance of glass fiber is poor.

[0005] Chinese patent CN105174716A discloses a dielectric glass composition comprising: a sufficient amount of silica to impart durability to the glass composition when subjected to humid environments; and one or more alkali metal oxides, wherein the total content of the alkali metal oxides is at least about 10% by weight and not more than about 35% by weight based on 100% total weight of the glass composition, wherein the median particle size (d50) of the glass composition is not greater than about 5 μm, and the glass composition has a coefficient of thermal expansion of at least about 10 ppm / K and not more than about 25 ppm / K.

[0006] In this patent, the total content of alkali metal oxides such as Na2O, K2O or Li2O is 10~35% to adjust the coefficient of thermal expansion; however, it is known that a high content of alkali metal oxides will reduce the chemical stability of glass, especially in humid environments, which will lead to alkali precipitation, hydrolysis or corrosion on the glass surface, affecting the insulation performance and long-term reliability of the dielectric layer. Summary of the Invention

[0007] The purpose of this invention is to provide an electronic-grade glass fiber composition, wherein the glass fiber cloth made from the electronic-grade glass fiber composition has a low dielectric constant and dielectric loss, and also has good processing performance and mechanical properties; this invention also provides the glass fiber cloth and its preparation method.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] The electronic-grade glass fiber composition of the present invention comprises, by weight percentage, the following components:

[0010] SiO2: 52.7~64.1%;

[0011] B2O3: 13.90~19.50%;

[0012] Al2O3: 12.46~18.03%;

[0013] SnO2: 0.42~1.51%;

[0014] P2O5: 1.77~2.5%;

[0015] CaO: 1.20~1.87%;

[0016] MgO: 1.18~3.43%;

[0017] F: 0.40~0.62%;

[0018] Sm2O3: 0.40~1.60%;

[0019] Yb₂O₃: 0.25~0.95%;

[0020] GeO2: 0.22~0.90%;

[0021] CaO+MgO≤5.3%.

[0022] in:

[0023] The electronic-grade glass fiber composition further includes impurity metal oxides, which include one or more of Fe2O3, TiO2, K2O or Na2O, and the content of impurity metal oxides is ≤0.08%.

[0024] The ratios (SnO2+Sm2O3) / Al2O3≥0.065, (SnO2+Sm2O3) / B2O3≥0.06, and P2O5 / (CaO+MgO)≥0.45 are specified.

[0025] The ratio of Sm2O3 / Yb2O3 is (1.60~1.68):1.

[0026] The ratio of B2O3 / (CaO+MgO+Al2O3) is ≤0.96.

[0027] The glass fiber cloth described in this invention is made from an electronic-grade glass fiber composition.

[0028] The method for preparing the glass fiber cloth of the present invention includes the following steps:

[0029] Quartz powder, boron anhydride, alumina, wollastonite, magnesium oxide, tin oxide, fluorite, aluminum metaphosphate, samarium oxide, ytterbium oxide, and germanium oxide are weighed and mixed to obtain an electronic-grade glass fiber composition. The electronic-grade glass fiber composition is melted, clarified, and homogenized at a temperature of 1400~1500℃ to obtain a glass melt. The glass melt is drawn into fibers in a nitrogen atmosphere after passing through a stencil to obtain electronic-grade glass fibers. The electronic-grade glass fibers are then warped, woven, opened, desized, impregnated, and dried to obtain glass fiber cloth.

[0030] β-OH is an impurity defect in glass fiber cloth. Its structural characteristics not only affect the electrical insulation performance of glass, but also reduce the physical properties of glass fiber and the processability of glass fiber weaving. Among them, the presence of H2O and H2 in the glass production process and non-bridging oxygen in the glass are important factors affecting the β-OH content.

[0031] This invention controls the β-OH content of glass fibers to be ≤0.4mm. -1That is, by selecting anhydrous raw materials, adding fluorine elements and drawing in an inert atmosphere, the hydroxyl content of glass fibers is controlled; 1. This invention uses boron anhydride instead of boric acid, and uses anhydrous salts such as wollastonite, and anhydrous oxides such as alumina, magnesium oxide, and germanium oxide as raw materials. 2. This invention adds SnO2, Sm2O3, and F. Appropriate amounts of Sm2O3 can reduce the free oxygen concentration in the glass and inhibit ion exchange under hydrothermal conditions, thereby reducing the β-OH content in the glass. Fluorine can further reduce high-temperature viscosity, making the glass melt more homogeneous. Simultaneously, SnO2, as a clarifying agent, can further promote bubble growth and assist in removing water vapor mixed in during processing. The interaction between the two makes it easier for water vapor to be removed. However, excessive fluorine residue can significantly increase the brittleness of the glass. This invention controls the F content to 0.4~0.62%. Furthermore, the dehydrated glass must form a dense structure to reduce the tendency to reabsorb moisture from the environment during subsequent processing and service. Therefore, this invention also ensures the densification of the glass after forming by rationally proportioning high-field-strength ions to network-forming elements ((SnO2+Sm2O3) / Al2O3≥0.065, (SnO2+Sm2O3) / B2O3≥0.06). 3. In the fiber drawing process, the present invention uses inert gas nitrogen to replace the cooling air in the traditional fiber drawing process, thereby reducing the contact between water vapor and fiber during fiber formation and minimizing the β-OH content.

[0032] in:

[0033] The liquidus temperature of the electronic-grade glass fiber is 1217~1232℃.

[0034] The forming temperature of the electronic-grade glass fiber is 1310~1329℃.

[0035] The electronic-grade glass fiber has an elastic modulus ≥ 67 GPa and a β-OH content ≤ 0.42 mm. -1 .

[0036] SiO2 is interconnected in the form of silicon-oxygen tetrahedral [SiO4] units, forming a continuous, amorphous three-dimensional network structure. The Si-O bonds are polar covalent bonds with high bond energy and strong covalent properties. They are not prone to dipole polarization under an external electric field, making them the main material that imparts low dielectric constant, good mechanical strength, and chemical stability to glass fibers. However, excessive SiO2 content leads to excessively high glass melting temperature, a sharp increase in glass melt viscosity, poor fluidity, and difficulty in bubble removal, resulting in difficulties in fiber drawing. This invention limits the SiO2 content to 52.7%~64.1%.

[0037] Al₂O₃ is an intermediate oxide. Aluminum can abstract non-bridging oxygen to form aluminum-oxygen tetrahedra [AlO₄], replacing some silicon atoms in the silicon-oxygen network and reconnecting the broken network. This strengthens the glass network structure and improves the mechanical properties and elastic modulus of the glass. An appropriate amount of Al₂O₃ can suppress the precipitation tendency of the quartz phase and improve melt stability, but excessive amounts can lead to excessively high high-temperature viscosity and a loosening of the network, causing a rebound in the coefficient of thermal expansion. This invention limits the Al₂O₃ content to 12.46~18.03%.

[0038] As a network former, B2O3 contains boron, which typically exists in tri- and tetra-ligand forms, forming trigonal [BO3] and tetrahedral [BO4] forms with oxygen, respectively. Adding an appropriate amount of B2O3, where boron and oxygen are predominantly tetrahedral, reduces polarizability, thereby lowering the dielectric constant. [BO4] strengthens the glass network structure, inhibits free ion migration, and reduces the probability of space charge polarization, thus lowering the glass's dielectric constant and dielectric loss. Furthermore, an appropriate amount of B2O3 can reduce glass viscosity at high temperatures, accelerating glass melting and refining; however, excessive amounts can increase the tendency for phase separation in the glass. This invention limits the B2O3 content to 13.90–19.50%.

[0039] In the following text, "R" 2+ "" refers to a divalent positive ion, "R + "" refers to a monovalent positive ion.

[0040] P2O5, as a network form, exists as phosphorus-oxygen tetrahedra [PO4], exhibiting good compatibility with silicon-oxygen tetrahedra. Appropriate amounts of P2O5 can lower the melting temperature of glass, improving processing difficulty; on the other hand, it can inhibit surface crystallization, enhance the thermal stability of glass fibers, increase the temperature resistance of glass, and shorten glass fiber lifespan; simultaneously, after phosphorus atoms replace some silicon atoms, they can capture oxidizing agents in the glass. 2+ Reduce R 2+ To improve mobility and form a more uniform amorphous network, thereby reducing ion migration and dipole relaxation losses, this invention limits the P2O5 content to 1.77~2.5% and P2O5 / (CaO+MgO)≥0.45.

[0041] As a flux, fluorine (F) can disrupt the silicon-oxygen framework, significantly reducing glass viscosity and surface tension, and accelerating the glass formation process. On the other hand, F atoms have very strong electronegativity, effectively trapping electrons and forming a low-polarity structure on the glass fiber surface, effectively reducing the dielectric constant and dielectric loss of the glass fiber. Excessive F will damage the glass network structure and reduce its mechanical properties. This invention limits the F content to a range of 0.40~0.62%.

[0042] CaO and MgO are alkaline earth metal oxides, acting as network exogens, meaning they do not participate in the network structure. Their ionic bonds have low single-bond strength. Appropriate amounts of CaO and MgO work together to reduce the high-temperature viscosity of the glass, as well as its dielectric constant and dielectric loss. Excessive CaO reduces the degree of polymerization in the glass network, leading to a lower glass transition temperature; it also increases the risk of crystallization, causing fiber embrittlement; furthermore, excessive CaO increases ion polarization and migration losses, resulting in higher dielectric constant and dielectric loss. Adding MgO to partially replace CaO... 2+ The relatively small ionic radius results in a stronger electric field, which can reduce ion migration polarization; however, excessive MgO can also lead to excessive crystallization. This invention limits CaO + MgO to ≤ 5.3%.

[0043] CaO and MgO are strong co-solvents that can effectively reduce melting temperature and production energy consumption, but they also introduce strong ionic polarization, leading to D k and D f To reduce the theoretical optical alkalinity of the glass composition, this invention controls the amount and content of alkaline earth metal oxides to obtain glass fibers with lower dielectric constants and dielectric losses. P2O5 itself is a network former and can participate in the formation of [PO4] structures. This invention controls P2O5 / (CaO+MgO) ≥ 0.45, reducing the number of non-bridged oxygen bonds in the glass by introducing P2O5, thus lowering R... 2+ Mobility: Introducing sufficient P2O5 can suppress the ion polarization effect caused by CaO and MgO, reduce the conductivity of glass fibers, and thus reduce the dielectric constant and dielectric loss.

[0044] An appropriate amount of B2O3 can form a boron-oxygen network with low migration resistance, reducing ion migration losses. This invention controls the B2O3 / (CaO+MgO+Al2O3) ratio to ≤0.96 to prevent incomplete conversion of [BO3] to [BO4] due to excessive B2O3, which would lead to enhanced polarization caused by network asymmetry. Simultaneously, it constrains CaO+MgO to ≤5.3% to reduce the amount of low-valence cations (CaO+MgO+Al2O3 ... 2+ / Mg 2+ To avoid the formation of non-bridging oxygen as a network modifier, thereby reducing dipole polarization; appropriate amounts of alkaline earth metal oxides (CaO, MgO) work synergistically with Al2O3 to form charge balance: CaO and MgO work with Al2O3 to form a stable [AlO4] structure, which improves glass stiffness, reduces polarization loss caused by structural relaxation, and prevents Al2O3 from transforming into highly polarized [AlO5] / [AlO6].

[0045] Control the β-OH content of glass fibers to ≤0.4mm. -1It can reduce dielectric loss and optical signal attenuation. Glass fiber has a more stable shrinkage rate during high-temperature processing, and better thermal stability, viscosity stability and fatigue resistance. Furthermore, it is beneficial for subsequent continuous production of glass fiber and glass fiber cloth forming.

[0046] The beneficial effects of this invention are as follows:

[0047] (1) Sm2O3, as a network modifier, can reduce the melting temperature of glass and improve the fluidity of glass melt by providing non-bridging oxygen to disrupt the connectivity of the silicon-oxygen network. 3+ With a 6-coordinate structure and an ionic radius of 0.96 Å, it replaces smaller ions, reducing the free volume in the disordered structure and thus decreasing dipole orientation polarization and ion migration losses. 3+ It is not prone to ion polarization loss, and Sm 3+ As a trivalent high-order-number cation, it has greater electronegativity and stronger bonding with oxygen ions, which can reduce relaxation polarization in the glass network and further reduce dielectric loss at high frequencies. Excess Sm₂O₃ will cause Sm 3+ Excessive concentration leads to excessively strong local electric fields and introduces defects such as vacancies and dislocations, increasing the resistance to ion migration in the alternating electric field and intensifying relaxation polarization, thereby increasing dielectric loss. This invention limits the Sm2O3 concentration to 0.40~1.60%.

[0048] SnO2 and Sm2O3 can provide sufficient free oxygen to increase the structural proportion of aluminum-oxygen tetrahedra [AlO4]. This has two effects: firstly, it improves the density of the glass fiber network and increases the elastic modulus of the glass fiber; secondly, it reduces the amount of non-bridging oxygen, thereby lowering the ionic polarization level of the glass fiber. 4+ and Sm 3+ As a high-field ion, it can induce the transformation of boron-oxygen trihedrons to boron-oxygen tetrahedrons, effectively reducing the dielectric constant and dielectric loss of glass fibers. This invention limits the SnO2 content to 0.42~1.51%, the Sm2O3 content to 0.40~1.60%, and the ratio of (SnO2+Sm2O3) / Al2O3 ≥ 0.065; (SnO2+Sm2O3) / B2O3 ≥ 0.06.

[0049] This invention simultaneously adds SnO2 and Sm2O3 to suppress the formation of non-bridged oxygen bonds and controls (SnO2+Sm2O3) / Al2O3≥0.065 and (SnO2+Sm2O3) / B2O3≥0.06, so that the glass fiber has a lower dielectric constant and dielectric loss, while effectively reducing the viscosity of the glass fiber, improving the strength and modulus of the glass fiber, and making it more suitable for large-scale industrial production requirements.

[0050] (2) Sm 3+ / Yb 3+Rare earth ions fill the voids in the glass network, suppressing dipole relaxation losses caused by lattice vibrations; simultaneously, this invention constrains the Sm₂O₃ / Yb₂O₃ ratio to (1.60~1.68):1; at this ratio, Sm₂O₃ / Yb₂O₃ can balance the crystal field effect between rare earth ions. 3+ and Yb 3+ It is a high-field-strength trivalent cation that can effectively bind to surrounding oxygen ions, Sm 3+ and Yb 3+ When entering the glass network, it typically interacts with [AlO4] and Ca. 2+ / Mg 2+ This creates a synergistic shielding and charge compensation effect, forming a stable local charge balance structure. This structure hinders other smaller, more mobile ions (such as Ca) in the glass network. 2+ The relaxation motion under the action of the electric field reduces relaxation polarization loss.

[0051] Sm 3+ The addition of Yb can promote glass phase shrinkage, reduce structural defects, and improve mechanical strength and thermal stability; 3+ It can partially replace sodium, calcium, and magnesium ions in the glass network, reducing the proportion of non-bridging oxygen in the network and enhancing the degree of polymerization. However, excessive Yb... 3+ This increases the polaron radius and interionic distance, weakens the field strength, and leads to a loosening of the glass structure and a decrease in density. This invention controls the ratio of Sm2O3 / Yb2O3 to (1.60~1.68):1. The densification effect of Sm2O3 and the network modification effect of Yb2O3 work synergistically to avoid the loosening of the glass structure and the decrease in density caused by excessive Yb2O3. The reasonable ratio suppresses the tendency of high-temperature crystallization of glass and improves its thermal stability.

[0052] Furthermore, Al2O3 mainly enters the network in the form of [AlO4], which helps to "integrate" and "immobilize" network-modifying ions (such as Ca). 2+ Mg 2+ To balance the negative charge from [AlO4], positive ions (Ca) are needed. 2+ Mg 2+ The location of these modified ions in their vicinity further restricts their movement and reduces losses. The reducing properties of SnO2 help ensure that all ions, including rare earth ions, are in stable valence states (such as Sm). 3+ and Yb 3+ This avoids the electronic conduction path that may result from mixed valence states, thereby reducing the associated dielectric loss.

[0053] (3) An appropriate amount of GeO2 mainly plays a role in reducing the melting temperature and viscosity of glass and improving its processing performance, and its Ge 4+It can replace silicon ions and participate in network structure formation without sacrificing the thermal stability and mechanical strength of the glass like other cosolvents; simultaneously, it can adjust the ratio of GeO2 to rare earth oxides (Sm2O3, Yb2O3), Sm 3+ Yb 3+ As a high field strength modified ion, GeO2 can enrich Sm 3+ Yb 3+ The function of Sm 3+ and Yb 3+ Ge is suppressed by compressing the free volume in the glass fiber. 4+ Migration reduces dielectric loss; P2O5 is also a network forger, but it forms PO-Ge heterobonds with Ge, which enhances the network crosslinking degree and reduces the degree of freedom of polarizable units. The two work synergistically to effectively suppress the increase of dielectric constant and reduce loss.

[0054] The introduction of GeO2 reinforces the glass fiber network. Both GeO2 and SiO2 are four-coordinate network-forming organisms. 4+ It can serve as another network center, absorbing a portion of the data from Ca. 2+ and Mg 2+ The generated non-bridging oxygen shares the network fracture pressure borne by SiO2, enabling the glass fiber network to maintain higher network connectivity and stability while introducing other necessary modifiers (alkaline earth metals, etc.) to adjust the melting temperature and process performance, thereby suppressing dielectric loss caused by the migration of alkaline earth metal ions. Detailed Implementation

[0055] The present invention will now be described and illustrated in detail with reference to the embodiments.

[0056] The preparation method of the glass fiber cloth in Examples 1-8 includes the following steps:

[0057] The compositions of the electronic-grade glass fiber compositions in Examples 1-8 are shown in Table 1. According to the proportions of each component in Table 1, the corresponding raw materials, quartz powder, boron anhydride, alumina, wollastonite, magnesium oxide, tin oxide, fluorite, aluminum metaphosphate, samarium oxide, ytterbium oxide, and germanium oxide, were calculated and weighed, and fed into a mixer to be mixed evenly to obtain the electronic-grade glass fiber composition. The electronic-grade glass fiber composition was fed into the tank kiln through the kiln head hopper and melted, clarified, and homogenized at a temperature of 1400-1500°C to obtain glass melt. The glass melt was drawn into fibers in a nitrogen atmosphere after passing through a platinum spinneret to obtain electronic-grade glass fiber. The electronic-grade glass fiber was then warped, woven, opened, desized, impregnated, and dried to obtain glass fiber cloth.

[0058] The performance test data for Examples 1-8 are shown in Table 1.

[0059] Table 1. Composition and performance test data of Examples 1-8

[0060]

[0061] In Table 1, 1. Forming temperature refers to the temperature at which the viscosity of the glass is 1000 Poise. It can characterize the forming temperature of the fiber. High-temperature viscosity can be obtained by measuring with a high-temperature viscometer. Liquidus temperature refers to the highest temperature at which crystals begin to precipitate during the cooling process of molten glass. The highest crystallization temperature of the glass is obtained using a gradient furnace and a polarizing microscope. ΔT refers to the difference between the forming temperature and the liquidus temperature.

[0062] 2. The elastic modulus of the glass fiber was tested according to GB / T 38897-2020 "Ultrasonic Measurement Method for Elastic Modulus and Poisson's Ratio in Nondestructive Testing".

[0063] 3. Prepare glass fiber samples with a size of Φ50×2mm and test them using a network vector analyzer. Set the center frequency to 10GHz, the sweep bandwidth to ±100MHz, and the number of points to ≥1001. After calibrating the equipment, test the samples to obtain the dielectric constant and dielectric loss values.

[0064] 4. The β-OH content was determined using Fourier transform infrared spectroscopy.

[0065] Comparative Example 1

[0066] Replace GeO2 with an equal mass of P2O5, and follow the same operating steps and raw materials as in Example 1.

[0067] Comparative Example 2

[0068] Replace P2O5 with an equal mass of GeO2, and follow the same operating steps and raw materials as in Example 1.

[0069] Comparative Example 3

[0070] The amounts of Yb2O3 and Sm2O3 were changed so that the Sm2O3 / Yb2O3 ratio was much smaller than in Example 1. The remaining operating steps and raw materials were the same as in Example 1.

[0071] Comparative Example 4

[0072] The amounts of Yb2O3 and Sm2O3 were changed so that the Sm2O3 / Yb2O3 ratio was much larger than in Example 1. The remaining operating steps and raw materials were the same as in Example 1.

[0073] Comparative Example 5

[0074] Replace Yb2O3 with an equal mass of Sm2O3, and follow the same operating steps and raw materials as in Example 1.

[0075] Comparative Example 6

[0076] Replace Sm2O3 with an equal mass of Yb2O3, and follow the same operating steps and raw materials as in Example 1.

[0077] Comparative Example 7

[0078] While increasing the mass of Al2O3 added, the mass of SnO2 and Sm2O3 added was reduced, and the remaining operation steps and raw materials used were the same as in Example 1.

[0079] Comparative Example 8

[0080] While increasing the mass of B2O3 added, the mass of SnO2 and Sm2O3 added was reduced, and the remaining operation steps and raw materials used were the same as in Example 1.

[0081] The composition and performance test results of Comparative Examples 1 to 8 are shown in Table 2.

[0082] Table 2. Composition and performance test data of Comparative Examples 1-8

[0083]

[0084] ΔT = Molding temperature - Liquidus temperature. Essentially, it represents the process safety window for the glass melt. Since the liquidus temperature is the critical point where viscosity rises sharply, a smoother viscosity change results in higher process tolerance and lower processing difficulty. Furthermore, a small ΔT requires precise temperature control; otherwise, crystallization will disrupt fiber continuity, making the fibers brittle. Therefore, ΔT reflects the processing performance of the glass fiber composition. The elastic modulus reflects the mechanical properties of the glass fiber cloth. The dielectric constant and dielectric loss directly affect the electrical properties of the PCB substrate made from glass fiber cloth, and the β-OH content also influences the electrical properties of the PCB substrate to some extent. A comparison of the data in Tables 1 and 2 shows that the embodiments of this invention achieve a better balance in terms of low dielectric constant, low dielectric loss, processing performance, and mechanical properties. This invention achieves both low dielectric loss and dielectric constant while maintaining good processing and mechanical properties.

Claims

1. An electronic grade glass fiber composition characterized in that, It contains the following components by weight percentage: SiO2: 52.7~64.1%; B2O3: 13.90~19.50%; Al2O3: 12.46~18.03%; SnO2: 0.42~1.51%; P2O5: 1.77~2.5%; CaO: 1.20~1.87%; MgO: 1.18~3.43%; F：0.40~0.62%； Sm2O3: 0.40~1.60%; Yb₂O₃: 0.25~0.95%; GeO2: 0.22~0.90%; CaO+MgO≤5.3%; Where Sm2O3 / Yb2O3=(1.60~1.68):1, (SnO2+Sm2O3) / Al2O3≥0.065, (SnO2+Sm2O3) / B2O3≥0.

06.

2. The electronic-grade glass fiber composition according to claim 1, characterized in that, The electronic-grade glass fiber composition also includes impurity metal oxides, which include one or more of Fe2O3, TiO2, K2O or Na2O, and the content of impurity metal oxides is ≤0.08%.

3. The electronic-grade glass fiber composition according to claim 1, wherein, P2O5 / (CaO+MgO)≥0.

45.

4. The electronic-grade glass fiber composition according to claim 1, wherein, B2O3 / (CaO+MgO+Al2O3)≤0.

96.

5. A glass fiber fabric characterized in that, It is prepared from the electronic-grade glass fiber composition according to any one of claims 1-4.

6. A method of producing the glass fiber cloth according to claim 5, characterized by, Includes the following steps: Quartz powder, boron anhydride, alumina, wollastonite, magnesium oxide, tin oxide, fluorite, aluminum metaphosphate, samarium oxide, ytterbium oxide, and germanium oxide are weighed and mixed to obtain an electronic-grade glass fiber composition. The electronic-grade glass fiber composition is melted, clarified, and homogenized at a temperature of 1400~1500℃ to obtain a glass melt. The glass melt is then drawn into fibers in a nitrogen atmosphere through a baffle to obtain electronic-grade glass fibers. Electronic-grade glass fiber is processed through warping, weaving, fiber opening, desizing, impregnation, and drying to obtain glass fiber cloth.

7. The method of producing a glass fiber sheet according to claim 6, wherein The liquidus temperature of electronic-grade glass fiber is 1217~1232℃.

8. The method for preparing glass fiber cloth according to claim 6, characterized in that, The molding temperature of electronic grade glass fiber is 1310~1329℃.

9. The method of producing a glass fiber sheet according to claim 6, wherein E-modulus of the electronic grade glass fiber > 67 GPa, beta-OH content of the electronic grade glass fiber < 0.42 mm -1 .

Images