Glass fiber resistant to 800 DEG C

Abstract

The invention relates to the field of glass fibers, and particularly discloses a glass fiber resistant to 800 DEG C. The glass fiber comprises silicon oxide, aluminum oxide, calcium oxide, magnesium oxide, titanium oxide, zirconium oxide, potassium oxide and sodium oxide. The glass fiber resistant to 800 DEG C comprises the following components in percentage by weight: more than or equal to 82% of silicon oxide and aluminum oxide, 9.5%-18% of calcium oxide and magnesium oxide, 0.2%-4.8% of titanium oxide and zirconium oxide, less than 0.8% of potassium oxide and sodium oxide, and the balance of impurities. The glass fiber prepared according to the formula has the characteristic of 800 DEG C resistance and good elastic property, the glass fiber product can be directly put into an environment of 800 DEG C for use without an acid pickling step, and the glass fiber product has an application value and is worthy of popularization and application. The step of removing alkali metal oxide and alkaline earth metal through acid pickling to improve the temperature resistance of a current glass fiber product is reduced, the acid pickling cost is reduced, the wastewater treatment procedure after acid pickling is reduced, and the environment-friendly performance is improved.

Description

Technical Field

[0001] The present invention relates to the field of glass fibers, and specifically to a glass fiber resistant to 800 °C. Background Art

[0002] Glass fibers have many advantages such as strong heat resistance, good insulation, high mechanical strength, and good corrosion resistance. Therefore, they have become the matrix material with the largest application amount in reinforced composite materials. Moreover, with the wide application of glass fibers, the requirements for glass fibers in industry and daily life are constantly increasing, and the application fields are also expanding accordingly.

[0003] At present, due to the inherent characteristics of glass fibers, the glass fiber cloths available on the market are not resistant to high temperatures (below 600 °C), and have low elasticity at high temperatures. The inventor found through research that there is a lack of application in the technical field where glass fibers reach 800 °C. Although there are existing technologies for improving the high-temperature resistance of glass fiber cloths, such as pickling the glass fiber cloth made of E-glass fiber, using pickling to wash away potassium, sodium, calcium, and magnesium oxides in the E-glass fiber, indirectly increasing the silica content, and the temperature resistance is improved to a certain extent. However, large-scale production and pickling not only increase the production cost, but also pollute the environment during the pickling process, increasing the subsequent treatment cost of pickling wastewater.

[0004] Based on this, the inventor provides a glass fiber that can achieve a performance of being resistant to 800 °C without pickling. Summary of the Invention

[0005] The purpose of the present invention is to provide a glass fiber resistant to 800 °C. The glass fiber prepared by the formula of the present invention has the characteristics of being resistant to 800 °C and good elastic properties, and does not need to go through the pickling step during subsequent products, and can be directly put into use in an environment of 800 °C. It has application value, reduces the need for the current glass fiber products to improve the temperature resistance through pickling, reduces the pickling cost, reduces the wastewater treatment process after pickling, and improves the environmental friendliness performance.

[0006] To solve the above technical problems, the present invention provides a glass fiber resistant to 800 °C. The glass fiber resistant to 800 °C contains silica, alumina, calcium oxide, magnesium oxide, titanium oxide, zirconium oxide, potassium oxide, and sodium oxide. Among them, by weight percentage, the sum of the contents of silica and alumina in the glass fiber resistant to 800 °C is greater than or equal to 82%, the sum of the contents of calcium oxide and magnesium oxide is 10% - 18%, the sum of the contents of titanium oxide and zirconium oxide is 0.2% - 4.8%, the sum of the contents of potassium oxide and sodium oxide is less than 0.8%, and the remaining impurities are less than 0.45%.

[0007] Preferably, by weight percentage, the content of the silica is 60% to 80%, and the content of the alumina is 4% to 23%.

[0008] Preferably, by weight percentage, the content of the calcium oxide is 0.5% to 10%, and the content of the magnesium oxide is 5% to 12%.

[0009] Preferably, by weight percentage, the content of the titanium oxide is 0.3% to 3%, and the content of the zirconium oxide is 0% to 4%.

[0010] Preferably, by weight percentage, the content of the potassium oxide is 0.1% to 0.4%, and the content of the sodium oxide is 0.1% to 0.7%.

[0011] Preferably, a number of the glass fibers resistant to 800 °C are wound into a ring with an inner diameter of 50 mm, and are respectively calcined in a muffle furnace at 800 °C for 1 h. The average inner diameter of the glass fibers at 800 °C for 1 h is 38 to 45 mm, and the heat shrinkage retention rate is 76% to 90%.

[0012] Preferably, the sum of the contents of the silica and the alumina in the glass fibers resistant to 800 °C is greater than 83%, and the sum of the contents of the calcium oxide and the magnesium oxide is 10.5% to 16%. A number of the glass fibers resistant to 800 °C are wound into a ring with an inner diameter of 50 mm, and are respectively calcined in a muffle furnace at 800 °C for 1 h. The average inner diameter of the glass fibers at 800 °C for 1 h is 41 to 45 mm, and the heat shrinkage retention rate is 82% to 90%.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The glass fibers prepared by the above formula of the present invention have the characteristics of being resistant to 800 °C and good elastic properties, and do not need to go through the pickling step during subsequent products, and can be directly put into use in an environment of 800 °C, which has application value, reduces the need for pickling to improve the heat resistance of current glass fiber products, reduces the pickling cost, reduces the wastewater treatment process after pickling, and improves the environmental friendliness. The glass fibers resistant to 800 °C of the present invention can be prepared into a fire extinguishing blanket for a gas station, which can quickly isolate the air to achieve fire extinguishing and can be reused multiple times, reducing the use cost.

[0015] 2. The glass fibers of the present invention have the characteristic of being resistant to 800 °C, and no melting phenomenon occurs after being calcined in a muffle furnace at 800 °C for 1 h, still having certain elastic properties, and the heat shrinkage retention rate at 800 °C for 1 h can reach 76% and above, which is much higher than the heat shrinkage retention rates of ordinary E fibers, ECR fibers, and high modulus fibers in the prior art.

[0016] 3. The glass fiber resistant to 800 °C of the present invention, when in the composition of the glass fiber resistant to 800 °C: the sum of the contents of silicon oxide and aluminum oxide is greater than 83%, the sum of the contents of calcium oxide and magnesium oxide is 10.5% - 16%, the prepared glass fiber resistant to 800 °C is wound into a ring with an inner diameter of 50 mm, and is respectively calcined in a muffle furnace at 800 °C for 1 h. The average value of the inner diameter of the glass fiber at 800 °C for 1 h is 41 - 45 mm, and the heat shrinkage retention rate is 82% - 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a comparison diagram before and after the heat resistance test of ordinary E fiber, ECR fiber, high modulus fiber 1 and high modulus fiber 2 in the prior art;

[0019] Figures 2 - 5 It is a comparison diagram before and after the heat resistance test of Examples 1 - 11 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] A glass fiber resistant to 800 °C of the present invention, specifically, the glass fiber resistant to 800 °C contains silicon oxide, aluminum oxide, calcium oxide, magnesium oxide, titanium oxide, zirconium oxide, potassium oxide and sodium oxide. Among them, by weight percentage, the sum of the contents of silicon oxide and aluminum oxide in the glass fiber resistant to 800 °C is greater than or equal to 82%, the sum of the contents of calcium oxide and magnesium oxide is 10% - 18%, the sum of the contents of titanium oxide and zirconium oxide is 0.2% - 4.8%, the sum of the contents of potassium oxide and sodium oxide is less than 0.8%, and the remaining impurities are less than 0.45%. Here, the impurities are mainly iron oxide, etc.;

[0022] Specifically, by weight percentage, the content of silica is 60% - 80%, the content of alumina is 4% - 23%; the content of calcium oxide is 0.5% - 10%, the content of magnesium oxide is 5% - 12%; the content of titanium oxide is 0.3% - 3%, the content of zirconium oxide is 0% - 4%; the content of potassium oxide is 0.1% - 0.4%, and the content of sodium oxide is 0.1% - 0.7%.

[0023] Common E - fibers, ECR - fibers, high - modulus fiber 1, and high - modulus fiber 2, which are common in the prior art, are selected and compared with Examples 1 - 11 prepared according to the above formula of the present invention. The glass components of each preparation are shown in Table 1:

[0024] Table 1

[0025]

[0026] The common E - fibers, ECR - fibers, high - modulus fiber 1, and high - modulus fiber 2, and the fibers made from Examples 1 - 11 of the present invention are respectively wound into rings with a diameter of 50 mm and burned in a muffle furnace at 800°C for 1 h. As Figures 1 - 5 shown, observe the state of the fiber surface and measure the inner diameter of the yarn ring. The heat - resistance test results obtained at the end of the test are shown in Table 2:

[0027] Table 2

[0028]

[0029] As can be seen from Table 2, for the common E - fiber, the fiber surface state at 800°C is that it has melted into glass, and the heat - shrinkage retention rate at 800°C for 1 h is 56%; for the ECR - fiber, the fiber surface state at 800°C is that it starts to melt, and the heat - shrinkage retention rate at 800°C for 1 h is 54%; for high - modulus fiber 1 and high - modulus fiber 2, the fiber surface states at 800°C are that single fibers are visible and there is no elasticity; the heat - shrinkage retention rates at 800°C for 1 h are 68% and 60% respectively;

[0030] However, for Examples 1 - 11 of the glass fiber resistant to 800°C prepared according to the formula of the present invention, no melting phenomenon appears in the test results of burning in a muffle furnace at 800°C for 1 h, demonstrating that the glass fiber of the present invention belongs to the heat - resistant type and reaches the characteristic of being resistant to 800°C; and the heat - shrinkage retention rate at 800°C for 1 h reaches 76% and above, which is much higher than the heat - shrinkage retention rates of the common E - fiber, ECR - fiber, high - modulus fiber 1, and high - modulus fiber 2 in the prior art;

[0031] In addition, the 800°C resistant glass fibers prepared in Examples 1-11 still have certain elastic properties after being calcined in a muffle furnace at 800°C for 1 hour. According to the different elastic conditions, they are divided into three states: slightly elastic, elastic, and moderately elastic.

[0032] Here, the judgment of the fiber state is mainly based on visual inspection and feel. Among them, there is a slight elasticity, which means that the sintered ring sample is flicked with the fingers 4-5 times, and broken fibers fall off; the fiber is elastic, which means that the sintered ring sample is flicked with the fingers 10-15 times (not including 15 times), and the fiber falls off; the fiber elasticity is acceptable, which means that the sintered ring sample is flicked with the fingers 15 times, and the fiber does not fall off.

[0033] According to the experimental results of Examples 1-11, when the components of the 800°C resistant glass fiber are: the sum of the contents of silicon oxide and aluminum oxide is greater than 83%, and the sum of the contents of calcium oxide and magnesium oxide is 10.5% to 16%, the prepared 800°C resistant glass fiber is wound into a ring with an inner diameter of 50 mm and burned in a muffle furnace at 800°C for 1 hour. The average inner diameter of the glass fiber at 800°C for 1 hour is 41 to 45 mm, and the thermal shrinkage retention rate is 82% to 90%.

[0034] As can be seen from Table 2, the fibers of Example 4 and Example 9 were wound into a ring with an inner diameter of 50 mm and burned in a muffle furnace at 800°C for 1 hour. At 800°C, the surface state of the fibers was visible as single fibers, and the fiber elasticity was acceptable, indicating that they had the property of being resistant to 800°C. The fiber elasticity data of the two examples were better, and they could withstand a temperature of 800°C for a long time.

[0035] Furthermore, the inventors conducted experiments based on the formulas of Example 4 and Example 9 and found that the following two formulas can withstand 800°C for a long time (at least 1 hour) and have good heat resistance and elasticity. Specifically:

[0036] Formula A: 800°C resistant glass fiber contains silicon oxide, aluminum oxide, calcium oxide, magnesium oxide, titanium oxide, zirconium oxide, potassium oxide and sodium oxide; wherein, by weight percentage, the sum of the silicon oxide and aluminum oxide contents in the 800°C resistant glass fiber is greater than 83%, the sum of the calcium oxide and magnesium oxide contents is 10% to 12%, the sum of the titanium oxide and zirconium oxide contents is 1% to 4%, the sum of the potassium oxide and sodium oxide contents is less than or equal to 0.5%, and the remaining impurities.

[0037] Formulation B: The glass fiber resistant to 800 °C contains silicon oxide, aluminum oxide, calcium oxide, magnesium oxide, titanium oxide, zirconium oxide, potassium oxide and sodium oxide; wherein, by weight percentage, the sum of the contents of silicon oxide and aluminum oxide in the glass fiber resistant to 800 °C is greater than 83%, the sum of the contents of calcium oxide and magnesium oxide is 14% - 16%, the sum of the contents of titanium oxide and zirconium oxide is 0.5% - 1%, the sum of the contents of potassium oxide and sodium oxide is less than or equal to 0.8%, and the rest are impurities; in this formulation, the content of zirconium oxide can be 0.

[0038] In terms of comprehensive cost, Formulation B can be preferably used to prepare the glass fiber resistant to 800 °C, with less raw materials and easy availability, and low preparation cost.

[0039] In summary, the glass fiber prepared by the above formulation of the present invention has the characteristics of being resistant to 800 °C and good elastic properties, and does not need to go through the pickling step during subsequent products, and can be directly put into use in an environment of 800 °C, which has application value, reduces the steps of removing alkali metal oxides and alkaline earth metal oxides by pickling to improve the temperature resistance of current glass fiber products, reduces the pickling cost, reduces the wastewater treatment process after pickling, and improves the environmental friendliness performance. The glass fiber resistant to 800 °C of the present invention can be prepared into a fire extinguishing blanket for gas stations, which can quickly isolate the air to achieve fire extinguishing and can be reused multiple times, reducing the use cost. Of course, the present invention can also be applied to high-temperature flue gas filtration in industry, collecting welding slag during the welding process, etc., expanding the application field and having the value of industrial production.

[0040] The above-disclosed are only the preferred embodiments of the present invention, and of course, the scope of rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A glass fiber resistant to 800 °C, characterized in that, The glass fiber resistant to 800 °C contains silicon oxide, aluminum oxide, calcium oxide, magnesium oxide, titanium oxide, zirconium oxide, potassium oxide and sodium oxide; Among them, by weight percentage, the sum of the contents of silicon oxide and aluminum oxide in the glass fiber resistant to 800 °C is greater than or equal to 82%, the sum of the contents of calcium oxide and magnesium oxide is 10% - 18%, the sum of the contents of titanium oxide and zirconium oxide is 0.2% - 4.8%, the sum of the contents of potassium oxide and sodium oxide is less than 0.8%, and the remaining impurities are less than 0.45%.

2. The glass fiber resistant to 800 °C according to claim 1, wherein By weight percentage, the content of the silicon oxide is 60% - 80%, and the content of the aluminum oxide is 4% - 23%.

3. The fiberglass resistant to 800 °C according to claim 1, characterized in that, By weight percentage, the content of the calcium oxide is 0.5% - 10%, and the content of the magnesium oxide is 5% - 12%.

4. A glass fiber resistant to 800 °C according to claim 1, characterized in that, By weight percentage, the content of the titanium oxide is 0.3% - 3%, and the content of the zirconium oxide is 0% - 4%.

5. A glass fiber resistant to 800 °C according to claim 1, characterized in that, By weight percentage, the content of the potassium oxide is 0.1% - 0.4%, and the content of the sodium oxide is 0.1% - 0.7%.

6. A glass fiber resistant to 800 °C, as claimed in claim 1, wherein A number of the glass fibers resistant to 800 °C are wound into a ring with an inner diameter of 50 mm, and are respectively burned in a muffle furnace at 800 °C for 1 h. The average inner diameter of the glass fibers at 800 °C for 1 h is 38 - 45 mm, and the heat shrinkage retention rate is 76% - 90%.

7. A glass fiber resistant to 800 °C according to claim 1, characterized in that, In the glass fiber resistant to 800 °C, the sum of the contents of silicon oxide and aluminum oxide is greater than 83%, and the sum of the contents of calcium oxide and magnesium oxide is 10.5% - 16%. A number of the glass fibers resistant to 800 °C are wound into a ring with an inner diameter of 50 mm, and are respectively burned in a muffle furnace at 800 °C for 1 h. The average inner diameter of the glass fibers at 800 °C for 1 h is 41 - 45 mm, and the heat shrinkage retention rate is 82% - 90%.

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