The Wonderful Uses of Aramid Staple Fiber 1. Molecular Structure Characteristics The amide bond is located at the para position (1,4 ) of the benzene ring. The molecular chain is linear and closely arranged, with strong intermolecular forces (hydrogen bonding is significant). 2. Core Performance Ultra-high Strength and Modulus: The breaking strength can reach 20-30 cN/dtex, which is more than 5 times that of steel wire, and the modulus is 2-3 times that of steel wire. It has excellent impact resistance and tear resistance properties. Excellent Heat Resistance: The long-term operating temperature is approximately 180-200℃. It can withstand temperatures above 400℃ for a short period without melting or supporting combustion. High Chemical Corrosion Resistance: Resistant to organic solvents, acids, bases (except strong oxidants), and has good dimensional stability. Low Density: Approximately 1.44g/cm3, which is only 1/5 of that of steel wire. The advantage of lightweight is very obvious. 3. Chief Application Rubber Reinforcement: For tire cord, conveyor belts, rubber hoses, etc., it replaces steel wires or nylon to enhance the strength and fatigue resistance of rubber products, while reducing weight. Friction Materials: such as automotive brake pads and clutch pads, which enhance the wear resistance and heat resistance of the materials and extend their service life. Composite Materials: Composed with resins, metals, etc., they are used in aerospace components, bulletproof materials (such as bulletproof vests, bulletproof helmets), sports equipment (such as tennis rackets, bicycle frames), etc. Protection Field: Bulletproof vests, stab-resistant suits, military and police equipment, etc., utilize their high strength to resist impacts and penetrations. 1. Molecular Structure Characteristics The amide bond is connected at the interposition (1,3) of the benzene ring. The molecular chain is tortuous, the structure is loose, and the intermolecular forces are relatively weak. 2. Core Performance High Temperature Resistance: The long-term operating temperature can reach 200-220℃. It can withstand temperatures above 300℃ for a short period. It does not melt, does not support combustion, and when exposed to fire, it only chars. Excellent Insulation Properties: It has excellent electrical insulation performance and is the preferred insulation material in high-temperature environments. Good Chemical Stability: Resistant to acids and alkalis, but with relatively low strength and modulus (breakage strength is approximately 3-4 cN/dtex). Excellent Flexibility: The fibers are soft and easy to be processed into short fibers and mixed with other materials. 3. Chief Application High-temperature Filtration Materials: such as industrial dust filter bags and filter materials for waste incinerators, which can withstand high temperatures and intercept particulate matter. Insulating Materials: Insulating paper for high-voltage motors and transformers, insulating boards, etc., which possess both high-temperature resistance and insulating properties. Protective Clothing: fire-fighting suits, metallurgical protective suits, etc., utilize their non-combustibility and heat resistance to protect the human body. Conclusion Para-aramid staple fiber, focuses on ultra-high strength and high modulus, and are concentrated in areas that require reinforcement, light-weighting, and impact resistance. Meta-aramid staple fiber, on the other hand, has the core advantages of high temperature resistance and insulation, and are mainly targeted at high-temperature protection and insulation scenarios. Both are high-performance materials, indispensable in industries such as industrial, protection, and aerospace, and their application scope is still expanding with technological advancements (such as enhancing battery separators in the new energy field, etc.).
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