Textile Polyamide/Nylon Filament
The morphological structure of the nylon obtained by the melt-spinning method observed in the microscope has a circular cross-section and no special longitudinal structure. Filamentous fibrils can be observed under an electron microscope, and the fibrils of nylon 66 are about 10-15nm wide. If a special-shaped spinneret is used, it can be made into nylon with various special cross-sectional shapes, such as polygonal, multi-lobed, hollow and other special-shaped cross-sections. Its focused state structure is closely related to the stretching and heat treatment in the spinning process. The macromolecular main chains of different nylons are all connected by carbon atoms and nitrogen atoms. The special-shaped fiber can change the elasticity of the fiber, make the fiber have special luster and bulkiness, and improve the cohesion and covering ability of the fiber, as well as anti-pilling, reducing static electricity and other properties. For example, the triangular fiber has a flash effect; the pentalobal fiber has a luster like fat, good hand feeling, and anti-pilling; the hollow fiber has a cavity inside, low density, and good heat retention. Polyamide (PA, commonly known as nylon) is the first resin developed by DuPont in the United States for fiber, which was industrialized in 1939. In the 1950s, injection molding products were developed and produced to replace metal to meet the requirements of lightweight and cost reduction of downstream industrial products. There are many repeating amide groups on the main chain of polyamide, which is called nylon when used as plastic, and nylon when used as synthetic fiber. Lactam to synthesize. According to the difference in the number of carbon atoms contained in diamines, diacids or amino acids, a variety of different polyamides can be prepared, and there are dozens of polyamide varieties, among which polyamide-6, polyamide-66 and polyamide Amide-610 is the most widely used. The link structures of polyamide-6, polyamide-66 and polyamide-610 are [NH(CH2)5CO], [NH(CH2)6NHCO(CH2)4CO] and [NH(CH2)6NHCO(CH2)8CO, respectively ]. Polyamide-6 and polyamide-66 are mainly used for spinning synthetic fibers, known as nylon-6 and nylon-66. Nylon-610 is a thermoplastic engineering plastic with excellent mechanical properties.Polyamide filament PA has good comprehensive properties, including mechanical properties, heat resistance, wear resistance, chemical resistance and self-lubrication, and has a low coefficient of friction, a certain flame retardancy, and is easy to process. It is suitable for use with glass fiber and Other fillers are filled and enhanced to improve performance and expand application range. There are many varieties of PA, including PA6, PA66, PAll, PA12, PA46, PA610, PA612, PA1010, etc., as well as many new varieties such as semi-aromatic nylon PA6T and special nylon developed in recent years. Nylon-6 plastic products can use sodium metal, sodium hydroxide, etc. as the main catalyst, and N-acetyl caprolactam as a co-catalyst, so that δ-caprolactam can be directly prepared by anion ring-opening polymerization in the model, which is called cast nylon. This method facilitates the manufacture of large plastic parts.Carbon fiber nylon filament 
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