High strength nylon (PA6) filament is a high-performance synthetic fiber. The following introduces its raw materials, production process, performance characteristics, and application fields:
1. Definition and raw materials
Basic definition: High strength nylon (PA6) filament is a continuous filament fiber made mainly from polycaprolactam. It belongs to a type of nylon fiber with excellent properties such as high strength and wear resistance.
Raw material source: Caprolactam is usually prepared by Beckmann rearrangement reaction of cyclohexanone oxime under certain conditions, and then obtained through polymerization reaction. These raw materials are mostly derived from petrochemical products, which undergo a series of complex chemical processing processes and are ultimately converted into the basic material of high-strength nylon (PA6) filament.
2. Production process
Aggregation: Adding caprolactam monomer into a reaction vessel, and conducting ring opening polymerization reaction under the action of initiators, catalysts, etc., to form polycaprolactam polymer. By correctly controlling parameters such as reaction temperature, pressure, and time, the polymer can achieve the required molecular weight and performance requirements.
Spinning: extruding the polymerized polycaprolactam melt through the spinning machine's nozzle to form a fine filament shape. During the extrusion process, by adjusting process parameters such as spinning temperature, speed, and stretching ratio, the filaments are stretched and oriented to align their molecular chains along the fiber axis, thereby improving the strength and other properties of the fibers.
Post treatment: The spun fibers also need to undergo a series of post-treatment processes, such as stretching, heat setting, oiling, etc. Stretching can further improve the strength and orientation of fibers; Heat setting makes the morphology and properties of fibers more stable; Oil treatment can improve the surface properties of fibers, enhance their softness, smoothness, and anti-static properties, and facilitate subsequent processing and use.
3. Performance characteristics
High strength: High strength nylon (PA6) filament has high tensile strength, and its breaking strength is usually between 6-9cN/dtex, which is higher than ordinary nylon fibers. It can withstand greater tensile and external forces and is not easy to break.
High wear resistance: It has excellent wear resistance, and after multiple frictions, the fiber surface is not easily worn. Its wear resistance is several times that of natural fibers such as cotton and wool, which can effectively extend the service life.
Good elasticity: With excellent elasticity recovery performance, it can quickly return to its original shape after being stretched or deformed, and is not easily deformed. The resulting fabric is comfortable to wear and not prone to wrinkling.
Moisture absorption: High strength nylon (PA6) filament has a certain degree of moisture absorption, which can absorb moisture from the air, making the fabric comfortable to wear, and also helping to regulate the humidity and temperature inside the fabric.
Chemical resistance: It has good resistance to many chemical substances, and the performance of fibers will not be significantly affected in general acidic, alkaline, organic solvent and other environments, with good chemical stability.
4. Application Fields
In the field of clothing：it is commonly used to make high-performance sportswear, outdoor clothing, etc., such as hiking clothes, skiing clothes, cycling clothes, etc. Its high strength, high elasticity, and good moisture absorption can meet the comfort and functional requirements of clothing during exercise.
In the industrial field：it can be used to manufacture tire cords, conveyor belts, ropes, fishing nets, etc. In tire cord, high-strength nylon (PA6) filament can provide good strength and stability for tires; In conveyor belts and ropes, their high strength and wear resistance ensure long-term use in harsh environments.
In the field of home textiles：there are also applications in home textile products such as bedding and curtains. By utilizing its good elasticity and softness, home textile products can have a better hand feel and user experience.
Other fields: It can also be used to produce key components for aerospace and automotive safety, such as parachutes and airbags. Its high strength and reliability can ensure safety performance in emergency situations.
