Polyimide spunlace nonwoven fabric weaves thermal protective clothing, solving the issue of stuffiness and poor breathability in workwear.

Polyimide spunlace nonwoven fabric is a new type of nonwoven material that combines high-performance fiber materials with advanced processing techniques. The spunlace nonwoven process—also known as the jet-web method—involves using high-pressure, fine water jets to spray and entangle fibers, thereby reinforcing them into a cohesive fabric. This process preserves the fibers' original properties without causing any damage, resulting in a final product that closely resembles traditional textiles in appearance. At the same time, the fabric boasts exceptional features such as high strength, minimal linting, excellent moisture absorption, rapid wicking, superior breathability, a soft hand feel, and outstanding drape characteristics. Compared to other nonwoven materials, nonwovens produced via the spunlace process retain the inherent superior performance of the fibers more effectively, thanks to their unique flexible intertwining method—a quality that is particularly crucial for high-performance fibers like polyimide.

Characteristics of Polyimide Spunlace Nonwoven Fabric

1. High-Temperature Resistance and Flame Retardancy

It can be used long-term at 250℃ without becoming brittle, decomposing, or losing functionality, and can briefly withstand temperatures exceeding 400℃. Importantly, it does not melt or drip; instead, it self-extinguishes when removed from the flame—meaning it will automatically go out once the ignition source is gone. With a limiting oxygen index as high as 38–44 (indicating that combustion requires oxygen concentrations of 38%–44% in air—whereas normal air contains only 21% oxygen), this material stands out as an exceptional flame-retardant option.

2. Soft, strong, and abrasion-resistant

The hydroentanglement process uses tens of millions of high-pressure, ultra-fine water jets to spray and intertwine the fiber web, thereby forming a fabric. This process ensures that no mechanical needles come into contact with the fibers, preventing any damage and resulting in a final product that feels exceptionally soft yet maintains exceptional mechanical strength and abrasion resistance—so much so that it virtually sheds neither lint nor fibers during use.

3. Excellent thermal insulation and chemical stability

Polyimide spunlace nonwoven fabric is not only a thermal barrier but also an excellent thermal insulator, effectively preventing heat transfer. At the same time, it exhibits outstanding resistance to most organic solvents, oils, acids, and bases, remaining impervious to swelling or corrosion, and maintaining stable performance even in challenging chemical environments.

4. Excellent breathability and comfort

The three-dimensional network structure formed by the hydroentanglement process is filled with tiny pores that allow air and water vapor to pass through freely, while effectively blocking even the finest particles. When used to make high-temperature protective clothing, the sweat vapor generated inside the wearer’s body can escape easily, preventing the oppressive "sauna-like" heat and significantly enhancing both comfort and safety during work operations.

Applications of Polyimide Spunlace Nonwoven Fabric

1. High-Temperature Protection Field

In the field of specialized protective gear, polyimide spunlace nonwoven fabric is used to manufacture fire-resistant and flame-retardant garments such as protective suits for armored units, racing car fireproof suits, and flightwear. These high-performance protective garments for specific applications place extremely stringent demands on material properties—including flame retardancy, high-temperature resistance, and mechanical strength—qualities that polyimide spunlace nonwoven fabric perfectly fulfills. Protective clothing made from this material boasts advantages like excellent flame retardancy, superior skin compatibility, dimensional stability, enhanced safety, and an exceptionally long service life.

In the field of industrial high-temperature protection, driven by market demand, China's metallurgical sector requires approximately 50,000 sets of heat-insulating, breathable, and flexible flame-retardant workwear annually. Meanwhile, sectors such as hydropower, nuclear industry, geology and mining, petrochemicals, and oilfields collectively need hundreds of thousands of protective garments each year. Additionally, these industries annually require around 300 tons of high-temperature-resistant, flame-retardant specialty fibers for protective clothing. Such substantial demand has created a vast market opportunity for polyimide spunlace nonwoven fabrics in the industrial high-temperature protection segment.

In the field of high-temperature protection, it is primarily used to manufacture various specialized thermal protective garments. Thanks to its outstanding resistance to high temperatures, flame retardancy, and superior thermal protection performance, polyimide spunlace nonwoven fabric has become an ideal material for fire-fighting suits, heat-insulating clothing, and other types of specialized protective wear. A double-layered gradient-structure nonwoven material made from polyimide fibers combined with viscose fibers not only boasts excellent directional water-management capabilities but also delivers exceptional thermal protection properties, making it suitable for applications in heat-insulating garments, fire-fighting suits, and other advanced thermal protection fields. Such protective clothing effectively shields against both high temperatures and flames, while its one-way moisture-wicking function enhances wearer comfort and helps reduce thermal stress responses among personnel.

2. Environmental Protection Filtration Materials Field

Cement industry flue gas treatment utilizes fine-denier polyimide fiber hydroentangled filter media to efficiently manage cement kiln exhaust gases. This solution boasts high performance, exceptional efficiency, extended service life, low resistance, and outstanding chemical corrosion resistance—making it specifically tailored to meet the demand for high-efficiency, low-resistance filtration of dust particles in the cement industry.

Smoke gas treatment in sectors such as power generation and steel production—industries where flue gases typically feature high temperatures, strong corrosiveness, and complex compositions—presents exceptionally demanding requirements for filtration materials. Polyimide spunlace nonwoven fabric, with its outstanding resistance to high temperatures, chemical corrosion, and consistently reliable filtration performance, can maintain long-term stability even under these harsh conditions, providing critical technical support for companies aiming to achieve emission standards and promote clean production.

3. High-End Industry and Specialized Applications

In the automotive interior sector, it is possible to develop industrial textiles specifically tailored for automotive applications. These products not only meet the performance requirements for elongation needed in the post-molding processes of automotive interior components but also offer additional functional features such as anti-adhesive properties, stain resistance, flame retardancy, and sound absorption (due to their high density). Polyimide spunlace nonwoven fabrics, with their outstanding overall performance, can be used in critical areas like car roofs, door panels, and engine compartment partitions.

In the aerospace field, polyimide spunlace nonwoven fabrics are primarily used for fire-retardant and thermal insulation layers in aircraft cabins, pipeline insulation, and structural components of aircraft, among other applications.

In the electronics industry, polyimide spunlace nonwoven fabric can be used to produce high-performance insulation materials, circuit board substrates, and more. Additionally, polyimide spunlace nonwoven fabric is also suitable for manufacturing lithium-ion battery separators, leveraging its excellent heat resistance and porous structure to enhance the battery's safety performance and cycle life.

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