Polyimide Pre-Oxidized Fiber Blended Felt: An Excellent Material in the Field of Specialized Protective Equipment

The pre-oxidized silk-polyimide blended felt is crafted by combining pre-oxidized fibers with polyimide fibers through an innovative process, fully leveraging the synergistic effects of these two high-performance materials to achieve optimized and enhanced performance.

1. Featuring outstanding high-temperature resistance, pre-oxidized silk fibers are produced by pre-oxidizing polyacrylonitrile fibers in air at temperatures ranging from 180 to 300°C. These fibers boast an极限 oxygen index of over 55%, delivering exceptional flame-retardant performance. Additionally, the rigid aromatic ring structure within the polyimide fiber’s macromolecular chain imparts remarkable thermal stability, allowing the material to maintain long-term usability at temperatures exceeding 260°C—and even withstand momentary exposure to temperatures surpassing 550°C. When these two materials are used in combination, the resulting felt products exhibit even superior high-temperature resistance and thermal stability.

2. The mechanical properties are excellent: during the pre-oxidation process, precursor polyacrylonitrile (PAN) fibers develop a trapezoidal structure, giving them high strength and modulus. Meanwhile, polyimide fibers exhibit outstanding mechanical performance, with tensile strengths reaching over 3.5 GPa. When these two materials are combined, the resulting composite demonstrates remarkable tensile strength, along with superior wear resistance and fatigue resistance—qualities that enable it to meet the demanding requirements of various challenging operating conditions.

3. With excellent chemical stability, the pre-oxidized silk-polyimide blended felt exhibits outstanding resistance to chemical corrosion, effectively withstanding the attack of most acids, bases, and organic solvents. The imide rings within the polyimide molecular structure confer exceptional chemical inertness, enabling the material to maintain stable performance even in challenging, complex chemical environments.

4. With excellent thermal insulation performance, the material boasts a low thermal conductivity (typically ranging from 0.2 to 0.4 W/m·K), making it an outstanding thermal insulation material. Its unique fibrous structure creates numerous microscopic pores, effectively blocking both heat conduction and convection, thereby providing reliable thermal protection for equipment and personnel operating in high-temperature environments.

Preoxidized silk-polyimide blended felt, with its outstanding comprehensive performance, demonstrates broad application prospects across multiple industrial sectors.

1. In the treatment of high-temperature flue gases in industries such as steel, cement, and power generation, this material demonstrates outstanding performance. Particularly in high-temperature, corrosive environments like waste incineration and chemical production, its exceptional thermal resistance and chemical stability make it the ideal material choice. Practical applications have shown that filtration systems using this material can achieve a service life extended by more than 30%, while operating resistance is reduced by 25%.

2. In specialized protective equipment for fields such as firefighting, defense industry, and petrochemicals, this material offers an outstanding solution for products like protective suits, fireproof blankets, and thermal insulation curtains. Its exceptional flame-retardant performance and superior thermal insulation properties provide reliable protection for workers on the job. Compared to conventional protective materials, at the same level of protection, it is 20% lighter in weight and significantly enhances comfort.

3. Aerospace field, This material is used in thermal protection systems, cabin insulation, equipment heat preservation, and other applications. Its lightweight yet high-strength properties meet the aerospace industry's demand for weight reduction, while also complying with stringent fire safety standards. It plays a critical role in key areas such as engine compartment insulation and hydraulic system protection.

4. In new energy fields such as lithium-battery manufacturing, solar equipment, and fuel cells, this material is used for thermal insulation and protection in thermal management systems. Its outstanding electrical insulation performance and high-temperature resistance ensure the safe operation of new-energy devices—particularly demonstrating exceptional effectiveness in thermal insulation and protection for electric vehicle battery packs.

5. In high-rise buildings, subway tunnels, large-scale commercial complexes, and other such venues, this material is used for fire-resistant door and window sealing, firebreaks, and protection of emergency escape routes, among other applications. Its outstanding fire-retardant performance and durability provide a new solution for building safety.

6. In equipment insulation for industries such as petrochemicals, metallurgy, and power generation, this material demonstrates exceptional thermal insulation performance. Compared to traditional insulation materials, it delivers an insulation efficiency improvement of more than 30%, extends service life by 50%, and achieves remarkable overall energy-saving benefits.

Compared to traditional materials, pre-oxidized silk polyimide blended felt demonstrates several significant technical advantages: it can withstand long-term use at temperatures exceeding 260°C and endure momentary exposure to temperatures over 550°C—far surpassing conventional organic materials. It also boasts excellent fire resistance, with a limiting oxygen index greater than 55%, remaining non-melting and non-dripping when exposed to flames, effectively preventing fire spread. Additionally, the material exhibits outstanding mechanical strength, achieving a tensile strength of over 15 MPa, along with exceptional wear resistance, ensuring an extended service life. Furthermore, it offers superior chemical stability, resisting most acids, bases, and organic solvents, making it ideal for harsh, corrosive environments. Its remarkable thermal insulation properties—characterized by low thermal conductivity and outstanding heat-retention capabilities—yield notable energy-saving benefits. Lastly, this material is environmentally friendly and safe, containing no harmful substances like asbestos, fully meeting stringent environmental standards while ensuring user safety.

With advancing technology and evolving market demands, pre-oxidized silk polyimide blended felt faces a promising future: moving toward multifunctional development by creating advanced composite materials that integrate multiple features such as flame retardancy, thermal insulation, sound absorption, and antibacterial properties, thereby meeting the needs of increasingly complex applications; embracing intelligent upgrades through the integration of smart functionalities like temperature sensing and condition monitoring, leading to the development of intelligent material systems capable of providing real-time feedback on usage conditions; adopting green manufacturing practices by pioneering eco-friendly production processes and recyclable technologies, reducing energy consumption and emissions during production while enhancing resource efficiency; expanding application areas as material performance continues to improve, opening up new opportunities in emerging sectors such as next-generation electric vehicles, 5G communications, and medical devices; and offering customized services by establishing comprehensive material databases and design platforms, enabling us to deliver personalized material solutions and rapid-response services tailored to our customers' specific requirements.

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