Preoxidized silk-composite silicone fabric is used as a sealing gasket for high-temperature equipment such as boilers, kilns, and hot presses.

Preoxidized silk-silicone composite fabric is produced by combining a layer of preoxidized silk fibers with a silicone rubber coating through a special manufacturing process, resulting in a multifunctional product that boasts both flexibility and durability. During the production of this composite fabric, the preoxidized silk serves as a reinforcing framework, providing fundamental mechanical strength and high-temperature resistance; meanwhile, the silicone rubber acts as the matrix material, enveloping the fibers to form a continuous protective layer that endows the material with excellent sealing properties, weather resistance, and flexibility.

From a manufacturing process perspective, the production of pre-oxidized fiber-reinforced silicone rubber fabric begins with the polymerization and degassing of acrylonitrile, followed by mixing it with a solvent to form a spinning dope. This dope is then processed through spinning, drawing, and drying steps to produce raw filaments. The raw filaments are subsequently subjected to a pre-oxidation step to create pre-oxidized fibers. Next, these pre-oxidized fibers are processed using textile techniques to form either woven fabrics or nonwoven fabrics. Finally, the fabrics are compounded with silicone rubber via calendering or impregnation processes to yield the final product.

Characteristics of pre-oxidized silk-composite silicone fabric:

1. Excellent flame-retardant and heat-resistant performance

In terms of heat resistance, preoxidized silk-composite silicone fabric can operate continuously for long periods in high-temperature environments up to 220℃ without aging or shrinking. Moreover, it can withstand brief exposure to temperatures as high as 1000℃ without burning. Under high temperatures, preoxidized silk fibers neither melt nor drip; instead, they only undergo surface carbonization while retaining their original fibrous skeletal structure.

Preoxidized silk-composite silicone fabric exhibits excellent flame-retardant performance. Preoxidized silk fibers have a very high limiting oxygen index and simply cannot sustain combustion in normal air (with an oxygen concentration of approximately 21%); thus, they are classified as long-lasting, flame-resistant materials.

2. Excellent thermal stability and thermal insulation performance

The preoxidized silk-composite silicone fabric has a low thermal conductivity, which results in extremely slow heat transfer. This effectively resists the penetration of high-temperature thermal flows, providing valuable time for personnel or equipment in the rear to escape and respond.

3. Superior mechanical performance and physical properties

In terms of mechanical performance, preoxidized fiber silicone fabric exhibits remarkable flexibility and strength. As a reinforcing framework, the preoxidized fibers provide high tensile strength and excellent tear resistance; meanwhile, the silicone rubber matrix endows the material with superior flexibility and plasticity, enabling it to conform to surfaces of various complex shapes. Additionally, the silicone material boasts excellent wear resistance, has a low density, and is lightweight, thus placing minimal additional weight burden on the original system while also resisting friction and wear over prolonged use.

4. Excellent chemical performance and weather resistance

Preoxidized silk-composite silicone fabric boasts outstanding chemical resistance, capable of withstanding the corrosive effects of most acids, bases, and solvents while maintaining stable performance in complex industrial environments. The silicone rubber layer itself exhibits excellent resistance to ozone, oxygen, UV radiation, and weathering, enabling the material to remain durable even under outdoor conditions and ensuring a remarkably long service life.

The silicone rubber layer imparts water resistance and washability to the material, making surface contaminants easy to clean and ensuring simple maintenance. These characteristics enable the pre-oxidized silk-composite silicone fabric to meet the demands of a wide variety of complex environments—from corrosive conditions in the chemical industry to climatic challenges in outdoor applications—making it suitable for use in diverse settings.

Applications of pre-oxidized silk-composite silicone fabric:

1. Personal Protective Equipment and Firefighting Gear

In the field of personal protective equipment, fire-resistant suits made from pre-oxidized silk-composite silicone fabric significantly reduce weight while maintaining excellent fire-retardant performance and markedly enhancing comfort. This material can withstand short-term high temperatures up to 1,200°C and, when burned, produces no molten droplets and releases no toxic gases, providing firefighters with all-around protection in extreme fire environments. In addition to fire-fighting suits, pre-oxidized silk-composite silicone fabric is also used in specialized combat uniforms, welding protective clothing, and protective gear for the petrochemical industry. The material’s flexibility allows protective garments to better conform to the human body, enabling unimpeded movement while still offering comprehensive protection.

2. Industrial Thermal Insulation and Sealing Protection

In the industrial sector, pre-oxidized fiber-reinforced silicone fabric is used as a sealing gasket in high-temperature equipment such as boilers, kilns, and hot presses, where it is applied to door gaps and joints. It not only effectively prevents heat loss but also compensates for dimensional changes caused by thermal expansion and contraction of the equipment.

3. Architecture and Transportation

In the construction industry, pre-oxidized fiber-reinforced silicone fabric is primarily used as a sealing material for fire-rated doors and windows, as a fire-resistant coating for steel structures, and as an insulating layer in escape devices for high-rise buildings. This material finds applications in public spaces such as upscale hotels, commercial complexes, and hospitals—ranging from thermal insulation of underfloor heating pipes and isolation around electric heaters to thermal insulation on the back of integrated cooking stoves in home decoration projects. Not only does it provide fire safety protection, but it also helps reduce energy loss.

In the transportation sector, in addition to battery protection for new-energy vehicles, pre-oxidized fiber composite silicone fabric is also used for fire-resistant compartmentation in ships, thermal insulation filling in high-speed train carriages, and thermal shields in automobile engine compartments. In these applications, the material not only meets stringent fire safety standards but also, thanks to its lightweight properties, helps achieve lightweight designs for vehicles, thereby playing a positive role in reducing energy consumption and extending driving range.

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