Wear-resistant and corrosion-resistant PTFE impregnated felt

Abstract

The utility model discloses a wear-resistant corrosion-resistant PTFE (Polytetrafluoroethylene) impregnated felt, which relates to the technical field of impregnated felts and comprises an impregnated felt body, the impregnated felt body is formed by compounding metal organic framework modified basalt fibers and fluorine-containing polymer fibers, and the impregnated felt body is of a honeycomb-like porous structure. The inner wall of each hole is formed by fibers which form a specific included angle with the impact direction of sand and dust and are arranged in a directional mode, and the joints of the holes of the impregnated felt body are filled with phase-changeable paraffin microcapsules. According to the utility model, the impregnated felt formed by compounding the metal organic framework modified basalt fiber and the fluorine-containing polymer fiber polytetrafluoroethylene has the characteristics of high temperature resistance, corrosion resistance and high strength, and can cope with severe environments such as steel smelting and desert photo-thermal power stations, and the honeycomb-like porous structure and the paraffin microcapsules can improve heat dissipation, resist sand and dust and adjust temperature; the service life is prolonged, and the maintenance and operation risks are reduced.

Description

Technical Field

[0001] This utility model relates to the field of impregnated felt technology, specifically a wear-resistant and corrosion-resistant PTFE impregnated felt. Background Technology

[0002] In continuous casting molds in the iron and steel smelting industry, impregnated felt is used for heat insulation and protection of the inner wall of the mold from direct erosion by high-temperature molten steel (temperatures can reach over 1500℃) and chemical corrosion caused by various alloying elements and impurities in the molten steel. Its high-temperature resistance prevents rapid deterioration of the felt under the radiant and contact heat of the high-temperature molten steel, ensuring its heat insulation performance in long-term high-temperature environments. Its corrosion resistance resists the erosion of the felt material by molten steel and its constituent substances, preventing contamination of the molten steel quality or damage to the inner wall of the mold due to material corrosion. Its high strength allows the impregnated felt to withstand the enormous impact force generated by the flow of molten steel, the thermal stress caused by rapid temperature changes, and the mechanical stress caused by mold vibration, thereby ensuring the stable operation of the continuous casting process, improving billet quality, and extending the service life of the mold.

[0003] In solar thermal power plants in desert regions, existing high-temperature and corrosion-resistant high-strength impregnated felt used for the protection of the concentrator system's reflector support structure faces unique challenges. In the desert environment, intense solar radiation during the day causes a rapid increase in ambient temperature, accompanied by a large amount of dust particles. These dust particles exhibit some adhesion at high temperatures, and some carry a weak static charge. During the tracking rotation of the concentrator system, these dust particles continuously impact the surface of the impregnated felt at high speed. Under electrostatic effects, they gradually adhere and accumulate on the felt surface, forming a hard, poorly conductive dust shell over time. This not only severely affects the heat dissipation performance of the impregnated felt, leading to excessively high internal temperatures and accelerated material aging, but also, due to the significant difference in thermal expansion coefficients between the dust shell and the felt body, interfacial stress is easily triggered in environments with large diurnal temperature variations (reaching over 50°C). This can cause micro-cracks in the impregnated felt, thereby compromising its overall structural integrity, reducing its corrosion and wear resistance, and ultimately affecting the stability and service life of the reflector support structure, increasing the maintenance costs and operational risks of the solar thermal power plant.

[0004] In view of this, a wear-resistant and corrosion-resistant PTFE impregnated felt is provided to overcome the above problems, aiming to effectively solve the special problems faced by impregnated felt in solar thermal power plants in desert areas, and improve the overall performance and service life of impregnated felt in this environment. Utility Model Content

[0005] The purpose of this invention is to provide a wear-resistant and corrosion-resistant PTFE impregnated felt to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides a wear-resistant and corrosion-resistant PTFE impregnated felt, including an impregnated felt body. The impregnated felt body is composed of metal-organic skeleton modified basalt fiber and fluoropolymer fiber. The impregnated felt body has a honeycomb-like porous structure, and the inner wall of each pore is composed of fibers oriented at a specific angle to the direction of sand and dust impact. The pore nodes of the impregnated felt body are filled with paraffin microcapsules that can undergo phase change.

[0007] Furthermore, the metal-organic framework modified basalt fiber is made of ZIF-8, which is uniformly grown on the surface of basalt fiber that has been pretreated to form a micro-rough structure by chemical vapor deposition, forming a nano-"spiky" structure.

[0008] Furthermore, the fluoropolymer fiber is made of polytetrafluoroethylene.

[0009] Furthermore, the angle between the oriented fibers and the direction of sand and dust impact ranges from 45° to 60°, which is used to reduce the penetration of sand and dust particles into the interior of the felt and to cause them to slide off or be carried away by the airflow.

[0010] Furthermore, the paraffin microcapsules undergo a phase transition when the local temperature of the felt increases, and absorb heat to improve heat dissipation performance, thereby reducing the risk of material aging and structural damage caused by high temperature.

[0011] Furthermore, the surface roughness of the metal-organic framework modified basalt fiber is on average between 0.5 μm and 2.0 μm, while the ten-point average roughness is between 3 μm and 8 μm, which is conducive to the uniform growth of ZIF-8.

[0012] Furthermore, the average pore diameter of the honeycomb-like porous structure is between 0.5-2μm. This size range ensures a certain structural strength, preventing the overall structure from becoming fragile due to excessively large pores, while also allowing for some airflow to aid in heat dissipation. At the same time, it provides some barrier effect against sand and dust particles, making it difficult for smaller sand and dust particles to enter the depths of the pores. Moreover, there are 1000-3000 pores per square centimeter, thus optimizing heat dissipation and dustproof performance while ensuring the integrity of the material structure.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] Metal-organic framework modified basalt fiber itself has certain high-temperature resistance properties and a high melting point, which can maintain good structural stability in high-temperature environments. Metal-organic framework modified basalt fiber after modification with metal-organic framework ZIF-8 further enhances its high-temperature resistance. ZIF-8 has good thermal stability and is not easily decomposed at high temperatures, which can effectively protect the structural integrity of basalt fiber and prevent it from deteriorating rapidly under the radiation heat and contact heat of molten steel above 1500℃ in continuous casting molds for a long time. This ensures that the impregnated felt body can maintain its heat insulation performance, ensures the stable operation of the continuous casting process, and avoids abnormal temperature rise in the mold due to the decrease in the heat insulation performance of the impregnated felt body, which would affect the quality of the cast billet.

[0015] Fluoropolymer fiber polytetrafluoroethylene has excellent high temperature resistance. Its chemical structure is stable and it can withstand high temperature environments without melting or deformation. When combined with metal-organic skeleton modified basalt fiber, the overall high temperature resistance limit of the impregnated felt body is improved, enabling it to better adapt to extreme high temperature conditions and extend its service life in high temperature environments.

[0016] Metal-organic framework modified basalt fiber has a nano-"spiky" structure on its surface that can block the erosion of corrosive substances to a certain extent. ZIF-8 itself has certain chemical stability and adsorption properties, and can adsorb some corrosive ions or molecules, reducing their damage to the fiber body. In the continuous casting crystallizer of iron and steel smelting, it can effectively resist the chemical corrosion caused by various alloying elements and impurities in molten steel, and prevent the contamination of molten steel quality or damage to the inner wall of the crystallizer due to material corrosion.

[0017] Fluoropolymer fibers made of polytetrafluoroethylene have extremely low surface energy and excellent chemical inertness. They hardly react with any chemical substances, which can greatly enhance the resistance of the felt material to various corrosive media. Whether in the strong acid and alkali environment of steel smelting or in the corrosive environment of salt and alkali that may exist in desert areas, they can maintain good corrosion resistance, thereby ensuring the long-term use effect of the impregnated felt body and reducing the performance degradation and structural damage caused by corrosion.

[0018] Metal-organic framework modified basalt fiber itself has high strength. After surface modification and compounding with fluoropolymers, the components form a synergistic effect. The combination of ZIF-8 and basalt fiber enhances the interaction force between fibers. Fluoropolymers fill the gaps between fibers, playing a role in bonding and reinforcement, enabling the impregnated felt to withstand greater external forces. In continuous casting molds, it can withstand the huge impact force generated by the flow of molten steel, the thermal stress caused by rapid temperature changes, and the mechanical stress caused by mold vibration, ensuring the integrity of the impregnated felt structure and avoiding damage or tearing due to insufficient strength, thereby ensuring the quality of the cast billet and extending the service life of the mold.

[0019] The honeycomb-like porous structure itself has a certain buffering and blocking effect. When sand particles collide with the impregnated felt, the porous structure can disperse the impact energy of the sand particles, preventing the energy from concentrating at one point and causing damage to the felt material. The inner wall of each hole is composed of fibers oriented at 45°-60° to the direction of sand impact. This arrangement allows some of the energy of the sand particles to be dispersed and absorbed by the fibers during impact. At the same time, due to the tilt angle of the fibers, the sand particles are not easy to penetrate into the interior of the impregnated felt body, but instead slide down along the fiber surface or are carried away by the airflow. In solar thermal power plants in desert areas, this effectively solves the problem of sand particles adsorbing and accumulating on the surface of the felt to form a hard sand shell with poor thermal conductivity. This avoids the problems of reduced heat dissipation performance, accelerated material aging, and damage to structural integrity caused by the sand shell, ensuring the stability and service life of the concentrating system reflector support structure, and reducing the maintenance cost and operational risk of the solar thermal power plant.

[0020] The honeycomb-like porous structure facilitates air circulation and promotes heat dissipation. In the high-temperature environment of desert regions, when the impregnated felt absorbs heat, air can flow through the pores, carrying away some of the heat and lowering the temperature of the felt body. In addition, the phase-change paraffin microcapsules filled at the pore nodes undergo phase change when the local temperature of the impregnated felt body 1 rises, absorbing heat and lowering the temperature, further improving heat dissipation performance. This helps reduce material aging and structural damage caused by excessive temperature, enabling the impregnated felt to work stably for a long time in high-temperature environments, improving its reliability and durability in the application of solar thermal power plants in desert regions.

[0021] Paraffin microcapsules undergo a phase change and absorb heat when the local temperature of the impregnated felt increases. This characteristic is of great significance in the application of solar thermal power plants in desert areas. When the ambient temperature rises sharply due to strong solar radiation during the day, the paraffin microcapsules can absorb heat to prevent the internal temperature of the impregnated felt from becoming too high. Since its phase change process is reversible, when the temperature drops, the paraffin releases heat, which to some extent plays a role in regulating the temperature and reducing the damage to the structure of the impregnated felt caused by thermal stress due to large diurnal temperature differences of more than 50°C. This helps maintain the structural integrity of the impregnated felt, ensures the stability of its high temperature resistance, corrosion resistance and high strength performance, extends its service life, and reduces the maintenance costs and operational risks of solar thermal power plants caused by the deterioration of the impregnated felt performance.

[0022] The micro-rough structure of the surface provides more attachment points and growth sites for ZIF-8 deposition, enabling it to form a uniform and stable nano-"spiky" structure. This uniform modified structure can better play its role in enhancing fiber performance, which is of positive significance in improving the high temperature resistance and corrosion resistance of the fiber as well as enhancing the bonding force between the fiber and fluoropolymers. This improves the overall performance of the impregnated felt body, enabling it to play a better role in various harsh environments such as steel smelting and desert applications, and ensuring the normal operation and long-term stability of related industrial equipment or facilities.

[0023] The design, with an average pore diameter between 0.5-2μm and 1000-3000 pores per square centimeter, optimizes functions such as dust and sand prevention and heat dissipation while ensuring structural strength. The smaller pore diameter and appropriate pore density prevent the overall structure from becoming fragile due to excessively large pores, making the impregnated felt body less prone to deformation or damage when subjected to external forces such as the impact of molten steel in continuous casting molds and the impact of wind and sand in desert areas. At the same time, this pore structure effectively blocks sand and dust particles from entering the interior of the impregnated felt body without excessively hindering air circulation, which is conducive to heat dissipation and temperature regulation. This allows the impregnated felt body to maintain good comprehensive performance in harsh environments such as high temperature and sand and dust, meeting the requirements of special application scenarios such as steel smelting and solar thermal power plants in desert areas for high temperature resistance, corrosion resistance, high strength, dust and sand prevention, heat dissipation and other performance aspects of the impregnated felt body, extending its service life and reducing maintenance costs and operational risks. Attached Figure Description

[0024] Figure 1 This is a schematic diagram showing the positional relationship between metal-organic skeleton modified basalt fibers and fluoropolymer fibers in a wear-resistant and corrosion-resistant PTFE impregnated felt according to this utility model.

[0025] Figure 2 This is a diagram illustrating the honeycomb-like porous structure of the impregnated felt body in a wear-resistant and corrosion-resistant PTFE impregnated felt according to this utility model.

[0026] Figure 3 This is a schematic diagram of the overall structure of a wear-resistant and corrosion-resistant PTFE impregnated felt according to this utility model.

[0027] In the figure: 1. Impregnated felt body; 2. Metal-organic framework modified basalt fiber; 3. Fluoropolymer fiber. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-3 This utility model provides a technical solution:

[0030] See Figures 1-3 As shown, a wear-resistant and corrosion-resistant PTFE impregnated felt includes an impregnated felt body 1, which is composed of metal-organic skeleton modified basalt fiber 2 and fluoropolymer fiber 3. The impregnated felt body 1 has a honeycomb-like porous structure, and the inner wall of each pore is composed of fibers oriented at a specific angle to the direction of sand and dust impact. The pore nodes of the impregnated felt body 1 are filled with paraffin microcapsules that can undergo phase change. The metal-organic skeleton modified basalt fiber 2 is made of ZIF-8 and integrally formed with a nano-"spiky" structure. The fluoropolymer fiber 3 is made of polytetrafluoroethylene. The angle between the oriented fibers and the direction of sand and dust impact is in the range of 45°-60°, which is used to reduce the penetration of sand and dust particles into the interior of the felt and promote their sliding or being carried away by the airflow. The paraffin microcapsules undergo phase change and absorb heat when the local temperature of the felt body rises.

[0031] Metal-organic framework modified basalt fiber 2 itself has certain high temperature resistance properties and a high melting point, which can maintain good structural stability in high temperature environments. After being modified with metal-organic framework ZIF-8, metal-organic framework modified basalt fiber 2 further enhances its high temperature resistance. ZIF-8 has good thermal stability and is not easily decomposed at high temperatures, which can effectively protect the structural integrity of basalt fiber and prevent it from deteriorating rapidly under the radiation heat and contact heat of molten steel above 1500℃ in continuous casting molds for a long time. This ensures that the impregnated felt body 1 can maintain its heat insulation performance, ensures the stable operation of the continuous casting process, and avoids abnormal temperature rise in the mold due to the decrease in the heat insulation performance of the impregnated felt body 1, which would affect the quality of the cast billet.

[0032] Fluoropolymer fiber 3, polytetrafluoroethylene, has excellent high temperature resistance and a stable chemical structure. It can withstand high temperatures without melting or deformation. When combined with metal-organic skeleton modified basalt fiber 2, it improves the overall high temperature resistance limit of the impregnated felt body 1, enabling it to better adapt to extreme high temperature conditions and extend its service life in high temperature environments.

[0033] Metal-organic framework modified basalt fiber 2 has a nano-"spiky" structure on its surface that can block the erosion of corrosive substances to a certain extent; ZIF-8 itself has certain chemical stability and adsorption properties, and can adsorb some corrosive ions or molecules, reducing their damage to the fiber body; in the continuous casting crystallizer of iron and steel smelting, it can effectively resist the chemical corrosion caused by various alloying elements and impurities in the molten steel, and prevent the contamination of the molten steel quality or damage to the inner wall of the crystallizer due to material corrosion.

[0034] Fluoropolymer fiber 3, made of polytetrafluoroethylene, has extremely low surface energy and excellent chemical inertness. It hardly reacts with any chemical substances, which can greatly enhance the resistance of the felt material to various corrosive media. Whether in the strong acid and alkali environment of steel smelting or in the corrosive environment of salt and alkali that may exist in desert areas, it can maintain good corrosion resistance, thereby ensuring the long-term use effect of the impregnated felt body 1 and reducing the performance degradation and structural damage caused by corrosion.

[0035] Metal-organic framework modified basalt fiber 2 itself has high strength. After surface modification and compounding with fluoropolymer, the components form a synergistic effect. The combination of ZIF-8 and basalt fiber enhances the interaction force between fibers. Fluoropolymer fills the gaps between fibers, playing a role in bonding and reinforcement, enabling the impregnated felt body 1 to withstand greater external forces. In the continuous casting mold, it can withstand the huge impact force generated by the flow of molten steel, the thermal stress caused by rapid temperature changes, and the mechanical stress caused by mold vibration, ensuring the integrity of the impregnated felt structure and avoiding damage or tearing due to insufficient strength, thereby ensuring the quality of the cast billet and extending the service life of the mold.

[0036] The honeycomb-like porous structure itself has a certain buffering and blocking effect. When sand particles collide with the impregnated felt, the porous structure can disperse the impact energy of the sand particles, so that the energy is not concentrated at one point and causes damage to the felt material. The inner wall of each hole is composed of fibers oriented at 45°-60° with the direction of sand impact. This arrangement allows some of the energy of the sand particles to be dispersed and absorbed by the fibers when they collide. At the same time, due to the tilt angle of the fibers, the sand particles are not easy to penetrate into the interior of the impregnated felt body 1, but slide down along the fiber surface or are carried away by the airflow. In the solar thermal power plant in the desert area, it effectively solves the problem of sand particles adsorbing and accumulating on the surface of the felt to form a hard sand shell with poor thermal conductivity. It avoids the problems of reduced heat dissipation performance, accelerated material aging and damage to structural integrity caused by the sand shell, ensuring the stability and service life of the concentrating system reflector support structure, and reducing the maintenance cost and operation risk of the solar thermal power plant.

[0037] The honeycomb-like porous structure facilitates air circulation and promotes heat dissipation. In the high-temperature environment of desert regions, when the impregnated felt absorbs heat, air can flow through the pores, carrying away some of the heat and lowering the temperature of the felt body. In addition, the phase-change paraffin microcapsules filled at the pore nodes undergo phase change when the local temperature of the impregnated felt body 1 rises, absorbing heat and lowering the temperature, further improving heat dissipation performance. This helps reduce material aging and structural damage caused by excessive temperature, enabling the impregnated felt to work stably for a long time in high-temperature environments, improving its reliability and durability in the application of solar thermal power plants in desert regions.

[0038] The paraffin microcapsules undergo a phase change and absorb heat when the local temperature of the impregnated felt body 1 rises. This characteristic is of great significance in the application of solar thermal power plants in desert areas. When the ambient temperature rises sharply due to strong solar radiation during the day, the paraffin microcapsules can absorb heat to prevent the internal temperature of the impregnated felt body 1 from becoming too high. Since its phase change process is reversible, when the temperature drops, the paraffin releases heat, which to some extent plays a role in regulating the temperature and reducing the thermal stress caused by the large diurnal temperature difference of more than 50°C, which can damage the structure of the impregnated felt body 1. This helps to maintain the structural integrity of the impregnated felt, ensure the stability of its high temperature resistance, corrosion resistance and high strength performance, extend its service life, and reduce the maintenance costs and operational risks of the solar thermal power plant caused by the decline in the performance of the impregnated felt.

[0039] Furthermore, the surface roughness of the metal-organic framework modified basalt fiber 2 is on average between 0.5μm and 2.0μm, while the ten-point average roughness is between 3μm and 8μm; the average pore diameter of the honeycomb porous structure is between 0.5 and 2μm; and there are 1000 to 3000 pores per square centimeter.

[0040] The micro-roughness of the surface provides more adhesion points and growth sites for ZIF-8 deposition, enabling the formation of a uniform and stable nano-"spiky" structure. This uniform modified structure can better enhance the fiber's performance, significantly improving its high-temperature resistance, corrosion resistance, and bonding strength with fluoropolymers. This enhances the overall performance of the impregnated felt body 1, allowing it to perform better in harsh environments such as steel smelting and desert applications, ensuring the normal operation and long-term stability of related industrial equipment or facilities.

[0041] The design, with an average pore diameter between 0.5-2μm and 1000-3000 pores per square centimeter, optimizes dust and sand prevention and heat dissipation while ensuring structural strength. The smaller pore diameter and appropriate pore density prevent excessively large pores from causing structural fragility, making the impregnated felt body 1 less prone to deformation or damage when subjected to external forces such as the impact of molten steel in continuous casting molds or the impact of wind and sand in desert areas. Simultaneously, this pore structure effectively blocks sand particles from entering the interior of the impregnated felt body 1 without excessively hindering airflow, which is beneficial for heat dissipation and temperature regulation. This allows the impregnated felt body 1 to maintain good comprehensive performance in harsh environments such as high temperatures and sandstorms, meeting the requirements of special applications such as steel smelting and solar thermal power plants in desert areas for high temperature resistance, corrosion resistance, high strength, dust and sand prevention, and heat dissipation, extending its service life and reducing maintenance costs and operational risks.

[0042] Working principle:

[0043] Metal-organic framework modified basalt fiber 2 itself has certain high temperature resistance properties and a high melting point, which can maintain good structural stability in high temperature environments. After being modified with metal-organic framework ZIF-8, metal-organic framework modified basalt fiber 2 further enhances its high temperature resistance. ZIF-8 has good thermal stability and is not easily decomposed at high temperatures, which can effectively protect the structural integrity of basalt fiber and prevent it from deteriorating rapidly under the radiation heat and contact heat of molten steel above 1500℃ in continuous casting molds for a long time. This ensures that the impregnated felt body 1 can maintain its heat insulation performance, ensures the stable operation of the continuous casting process, and avoids abnormal temperature rise in the mold due to the decrease in the heat insulation performance of the impregnated felt body 1, which would affect the quality of the cast billet.

[0044] Fluoropolymer fiber 3, polytetrafluoroethylene, has excellent high temperature resistance and a stable chemical structure. It can withstand high temperatures without melting or deformation. When combined with metal-organic skeleton modified basalt fiber 2, it improves the overall high temperature resistance limit of the impregnated felt body 1, enabling it to better adapt to extreme high temperature conditions and extend its service life in high temperature environments.

[0045] Metal-organic framework modified basalt fiber 2 has a nano-"spiky" structure on its surface that can block the erosion of corrosive substances to a certain extent; ZIF-8 itself has certain chemical stability and adsorption properties, and can adsorb some corrosive ions or molecules, reducing their damage to the fiber body; in the continuous casting crystallizer of iron and steel smelting, it can effectively resist the chemical corrosion caused by various alloying elements and impurities in the molten steel, and prevent the contamination of the molten steel quality or damage to the inner wall of the crystallizer due to material corrosion.

[0046] Fluoropolymer fiber 3, made of polytetrafluoroethylene, has extremely low surface energy and excellent chemical inertness. It hardly reacts with any chemical substances, which can greatly enhance the resistance of the felt material to various corrosive media. Whether in the strong acid and alkali environment of steel smelting or in the corrosive environment of salt and alkali that may exist in desert areas, it can maintain good corrosion resistance, thereby ensuring the long-term use effect of the impregnated felt body 1 and reducing the performance degradation and structural damage caused by corrosion.

[0047] Metal-organic framework modified basalt fiber 2 itself has high strength. After surface modification and compounding with fluoropolymer, the components form a synergistic effect. The combination of ZIF-8 and basalt fiber enhances the interaction force between fibers. Fluoropolymer fills the gaps between fibers, playing a role in bonding and reinforcement, enabling the impregnated felt body 1 to withstand greater external forces. In the continuous casting mold, it can withstand the huge impact force generated by the flow of molten steel, the thermal stress caused by rapid temperature changes, and the mechanical stress caused by mold vibration, ensuring the integrity of the impregnated felt structure and avoiding damage or tearing due to insufficient strength, thereby ensuring the quality of the cast billet and extending the service life of the mold.

[0048] The honeycomb-like porous structure itself has a certain buffering and blocking effect. When sand particles collide with the impregnated felt, the porous structure can disperse the impact energy of the sand particles, so that the energy is not concentrated at one point and causes damage to the felt material. The inner wall of each hole is composed of fibers oriented at 45°-60° with the direction of sand impact. This arrangement allows some of the energy of the sand particles to be dispersed and absorbed by the fibers when they collide. At the same time, due to the tilt angle of the fibers, the sand particles are not easy to penetrate into the interior of the impregnated felt body 1, but slide down along the fiber surface or are carried away by the airflow. In the solar thermal power plant in the desert area, it effectively solves the problem of sand particles adsorbing and accumulating on the surface of the felt to form a hard sand shell with poor thermal conductivity. It avoids the problems of reduced heat dissipation performance, accelerated material aging and damage to structural integrity caused by the sand shell, ensuring the stability and service life of the concentrating system reflector support structure, and reducing the maintenance cost and operation risk of the solar thermal power plant.

[0049] The honeycomb-like porous structure facilitates air circulation and promotes heat dissipation. In the high-temperature environment of desert regions, when the impregnated felt absorbs heat, air can flow through the pores, carrying away some of the heat and lowering the temperature of the felt body. In addition, the phase-change paraffin microcapsules filled at the pore nodes undergo phase change when the local temperature of the impregnated felt body 1 rises, absorbing heat and lowering the temperature, further improving heat dissipation performance. This helps reduce material aging and structural damage caused by excessive temperature, enabling the impregnated felt to work stably for a long time in high-temperature environments, improving its reliability and durability in the application of solar thermal power plants in desert regions.

[0050] The paraffin microcapsules undergo a phase change and absorb heat when the local temperature of the impregnated felt body 1 rises. This characteristic is of great significance in the application of solar thermal power plants in desert areas. When the ambient temperature rises sharply due to strong solar radiation during the day, the paraffin microcapsules can absorb heat to prevent the internal temperature of the impregnated felt body 1 from becoming too high. Since its phase change process is reversible, when the temperature drops, the paraffin releases heat, which to some extent plays a role in regulating the temperature and reducing the thermal stress caused by the huge diurnal temperature difference of more than 50°C, which can damage the structure of the impregnated felt body 1. This helps to maintain the structural integrity of the impregnated felt, ensure the stability of its high temperature resistance, corrosion resistance and high strength performance, extend its service life, and reduce the maintenance costs and operational risks of the solar thermal power plant caused by the decline in the performance of the impregnated felt.

[0051] The micro-rough structure of the surface provides more attachment points and growth sites for ZIF-8 deposition, enabling it to form a uniform and stable nano-"spiky" structure. This uniform modified structure can better play its role in enhancing fiber performance, which is of positive significance in improving the high temperature resistance and corrosion resistance of the fiber as well as enhancing the bonding force between the fiber and the fluoropolymer. This improves the overall performance of the entire impregnated felt body 1, enabling it to play a better role in various harsh environments such as steel smelting and desert applications, and ensuring the normal operation and long-term stability of related industrial equipment or facilities.

[0052] The design, with an average pore diameter between 0.5-2μm and 1000-3000 pores per square centimeter, optimizes functions such as dust and sand prevention and heat dissipation while ensuring structural strength. The smaller pore diameter and appropriate pore density prevent the overall structure from becoming fragile due to excessively large pores, making the impregnated felt body 1 less prone to deformation or damage when subjected to external forces such as the impact of molten steel in continuous casting molds and the impact of wind and sand in desert areas. At the same time, such a pore structure can effectively block sand and dust particles from entering the interior of the impregnated felt body 1 without excessively hindering air circulation, which is conducive to heat dissipation and temperature regulation. This allows the impregnated felt body 1 to maintain good comprehensive performance in harsh environments such as high temperature and sand and dust, meeting the requirements of special application scenarios such as steel smelting and solar thermal power plants in desert areas for high temperature resistance, corrosion resistance, high strength, dust and sand prevention, heat dissipation and other performance aspects of the impregnated felt body 1, extending its service life and reducing maintenance costs and operational risks.

Claims

1. A wear-resistant and corrosion-resistant PTFE impregnated felt, comprising an impregnated felt body (1), characterized in that, The impregnated felt body (1) is composed of metal-organic skeleton modified basalt fiber (2) and fluoropolymer fiber (3). The impregnated felt body (1) has a honeycomb-like porous structure, and the inner wall of each hole is composed of fibers oriented at a specific angle to the direction of sand and dust impact. The holes of the impregnated felt body (1) are filled with phase-change paraffin microcapsules.

2. The wear-resistant and corrosion-resistant PTFE impregnated felt as described in claim 1, characterized in that: The metal-organic framework modified basalt fiber (2) is made of ZIF-8 and has an integrally formed nano-"spiky" structure.

3. The wear-resistant and corrosion-resistant PTFE impregnated felt as described in claim 1, characterized in that: The fluoropolymer fiber (3) is made of polytetrafluoroethylene.

4. The wear-resistant and corrosion-resistant PTFE impregnated felt as described in claim 1, characterized in that: The angle between the oriented fibers and the direction of sand and dust impact ranges from 45° to 60°, which is used to reduce the penetration of sand and dust particles into the interior of the felt and to cause them to slide off or be carried away by the airflow.

5. The wear-resistant and corrosion-resistant PTFE impregnated felt as described in claim 1, characterized in that: The paraffin microcapsules undergo a phase transition and absorb heat when the local temperature of the felt increases.

6. The wear-resistant and corrosion-resistant PTFE impregnated felt as described in claim 1, characterized in that: The surface roughness of the metal-organic framework modified basalt fiber (2) is on average between 0.5 μm and 2.0 μm, while the ten-point average roughness is between 3 μm and 8 μm.

7. The wear-resistant and corrosion-resistant PTFE impregnated felt as described in claim 1, characterized in that: The average pore diameter of the honeycomb-like porous structure is between 0.5 and 2 μm.

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