Polyimide Nonwoven Fabric Products
Product Description
Changshu Yongdeli Spunlaced Nonwoven Co., Ltd. specializes in the research, development, and production of high-performance polyimide (PI) nonwoven fabrics. Utilizing high-quality polyimide resin as the raw material, the company manufactures continuous PI fibers through specialized spinning processes, followed by high-pressure hydroentanglement technology to create flexible, intertwined structures. This results in polyimide nonwoven products tailored for demanding applications such as high-temperature flame retardancy, weather and aging resistance, and functional composites. The following sections detail the core characteristics and primary application areas, highlighting the differentiated value of these materials as benchmarks in specialty engineering.
I. Core Characteristics of Polyimide Nonwoven Fabric: The All-Round Performer in Extreme Environments
Leveraging the inherent advantages of PI material and the unique properties of the hydroentanglement process, polyimide nonwoven fabric exhibits three core characteristics that overcome the performance limitations of conventional organic and inorganic fibers in high-temperature, flame-retardant, weather-resistant, and functionally integrated scenarios:
1. High-Temperature Stability + Intrinsic Flame Retardancy: A Safety Barrier for High-Risk Environments
Superior thermal resistance compared to conventional materials: Unlike aramid (long-term service temperature: 204°C) and PTFE (long-term service temperature: 260°C), polyimide maintains structural integrity under continuous operation at 260°C, with short-term tolerance up to 400°C. The hydroentangled fiber structure remains undamaged, demonstrating no signs of aging or degradation after over 1.5 years of continuous use in applications such as waste incineration and metallurgical high-temperature environments, resulting in a service life more than three times that of aramid materials.
Top-tier flame retardancy: Without the need for flame-retardant additives, the material achieves a limiting oxygen index (LOI) of 38% (significantly exceeding PTFE's 28% and aramid's 29%). It does not ignite or melt-drip upon exposure to flame, self-extinguishes instantly upon flame removal, and releases no toxic gases during combustion. This effectively prevents flame propagation, addressing critical drawbacks of traditional flame-retardant materials such as melting-induced injuries and toxic fume emission.
2. Comprehensive Weather Resistance + Mechanical Stability: A Durable Armor for Harsh Conditions
Exceptional corrosion and aging resistance: The fabric exhibits excellent resistance to most acid-base media (e.g., 10% sulfuric acid, 15% sodium hydroxide), organic solvents, and UV radiation, with a tensile strength loss of ≤8% after 60 days of immersion. It shows no embrittlement or degradation under long-term exposure to outdoor UV, humidity, and heat, achieving a service life of 8–10 years in nuclear power and outdoor engineering applications—over 10 times that of conventional polyester materials.
Outstanding mechanical properties: With a fiber density of 1.41 g/cm³ and a longitudinal breaking strength of 600 N/5×20 cm, it offers 20 times the strength of polypropylene fabric at the same weight. After hydroentanglement, the tear resistance reaches ≥50 N, with 100% wet strength retention. This overcomes the low-temperature brittleness of basalt fibers and the insufficient mechanical strength of PTFE, making it suitable for heavy-load and dynamic stress applications.
3. Functional Compatibility + Flexible Processing: A Versatile Foundation for Customization
Hydroentanglement preserves material activity: The high-pressure spunlace process ensures gentle fiber entanglement without the damage associated with needle punching. The resulting product is soft (hardness ≤50 Shore A) with excellent drape, allowing direct cutting, sewing, and thermoforming. This resolves the processing challenges of traditional PI needle felts, which are often stiff and brittle, while providing a smooth, burr-free surface ideal for precision component integration.
High potential for functionalization: Through surface modification or composite techniques, the fabric can be endowed with multiple advanced functionalities. For instance, after alkali treatment and loading with Fe₃O₄ and Ag nanoparticles, it achieves high electromagnetic shielding effectiveness (77 dB) and ultra-low reflectivity (≤-10 dB). When combined with nanofibers, it exhibits both high-temperature filtration and antibacterial properties, meeting diverse requirements in military camouflage and high-end medical applications.
II. Primary Application Fields of Polyimide Nonwoven Fabric: Irreplaceable Solutions for High-End Scenarios
Based on the above characteristics, polyimide nonwoven fabric has become an essential material in high-temperature filtration, specialty protection, electronics/military, and advanced medical fields, catering to high-risk, high-demand, and long-life applications:
1. High-Temperature Filtration and Environmental Protection: The Primary Purification Solution for Severe Conditions
High-temperature flue gas filtration: Used in filter bags for waste incineration plants and dust removal filters in coal-fired power plants, the fabric effectively captures fine dust and corrosive particles at 300°C, with a filtration precision of 0.5 μm. Its high LOI (38%) prevents combustion risks caused by potassium and sodium in fly ash, offering a service life more than twice that of PPS filter materials.
Industrial high-temperature filtration: Applications include filter cloths for asphalt mixing station emissions and filter bags for high-temperature solvent filtration in chemical plants. The fabric withstands 260°C temperatures and organic solvent corrosion, does not adsorb filtrate components, ensures product purity, and exhibits superior anti-clogging performance, reducing filtration resistance by 30% compared to traditional glass fiber filters.
2. Specialty Protection and Safety: A Lifeline in High-Risk Scenarios
Personal protective equipment: Used as lining for metallurgical fireproof clothing and fabric for firefighters' heat insulation suits, the material maintains structural integrity at 260°C, with a thermal conductivity of only 0.03 W/(m·K), effectively blocking high-temperature radiation. Its soft, breathable texture offers far greater comfort than traditional rock wool materials, making it ideal for high-temperature operations in metallurgy and firefighting.
Emergency protection products: Applications include military fireproof tent fabric and flame-retardant barriers for high-risk areas. The intrinsically flame-retardant and weather-resistant material does not degrade under outdoor humidity, heat, or strong UV exposure, serving as a durable fixed barrier. Its compact folded size allows rapid deployment in emergencies, suitable for military camouflage and chemical incident response.
3. Electronics and Military Applications: The Performance Core of High-End Equipment
Electromagnetic shielding materials: Used in radar stealth fabrics and anti-interference padding for electronic devices, the fabric achieves efficient electromagnetic wave absorption across the 8.2–40 GHz broadband range after magnetic particle loading and electroless silver plating, with shielding effectiveness up to 77 dB. It maintains stable performance at 250°C, protecting military equipment from electromagnetic interference while enabling infrared stealth.
High-temperature insulation components: Applications include insulation liners for aircraft engines and encapsulation cloth for high-end electronic components. With a dielectric strength ≥25 kV/mm at 260°C and no degradation in insulation performance, the fabric resists corrosion by oils and fuels, preventing short circuits in electronic components and meeting the needs of aerospace and premium automotive industries.
4. Medical and High-End Textiles: Ensuring Safety and Cleanliness
Medical protective products: Used in high-temperature sterilizable surgical gowns and sterile dressing substrates, the material offers excellent biocompatibility (non-allergenic, non-irritating) and withstands 134°C steam sterilization without fiber shedding, complying with GMP sterile standards. It ensures operational safety in advanced medical scenarios such as organ transplantation and minimally invasive surgery.
Functional textiles: Applications include flame-resistant suits for racing and protective clothing for the nuclear industry. The permanently flame-retardant, breathable, and comfortable fabric causes no skin irritation during prolonged wear. It also resists radiation and chemical corrosion, protecting workers from burns and radioactive exposure in specialized settings like motorsports and nuclear power maintenance.
About Yongdeli: A Specialist Manufacturer of Polyimide Nonwoven Fabrics
Changshu Yongdeli Spunlaced Nonwoven Co., Ltd. operates automated production lines for polyimide nonwoven fabrics, offering customized products with weights ranging from 60–500 g/㎡ and widths of 0.2–3.2 m. The company also provides post-treatment options including magnetic coating, nanofiber compositing, and singeing/calendering.
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