What are the characteristics of nylon as an important raw material for plastics?

Polyamide, commonly known as nylon (Nylon), English name Polyamide (abbreviated as Pa), is a generic term for thermoplastic resins containing a repeating amide group - [NHCO] in the main chain of the molecule. Including aliphatic Pa, fat-aromatic Pa and aromatic Pa. Among them, aliphatic Pa has many varieties, large yield and wide application, and its name is determined by the specific carbon number of the synthetic monomer.

The main varieties of nylon are nylon 6 and nylon 66, which are dominant, followed by nylon 11, nylon 12, nylon 610, nylon 612, nylon 1010, nylon 46, nylon 7, nylon 9, nylon 13, New varieties include nylon 6I, nylon 9T and special nylon MXD6 (barrier resin). Nylon has a wide variety of modified varieties, such as reinforced nylon, monomer cast nylon (MC nylon), reaction injection molding (RIM) nylon, aromatic Nylon, transparent nylon, high impact (super tough) nylon, electroplated nylon, conductive nylon, flame retardant nylon, nylon and other polymer blends and alloys, to meet different special requirements, widely used as traditional materials such as metal, wood, etc. Substitutes, as a variety of structural materials.

Nylon is the most important engineering plastic, and its output ranks first among the five general engineering plastics.

Performance: Nylon is a tough horny translucent or milky white crystalline resin. As a engineering plastic, the molecular weight of nylon is generally 1.5 to 30,000. The nylon has high mechanical strength, high softening point, heat resistance, low friction coefficient and wear resistance. Self-lubricating, shock absorption and sound absorbing, oil resistant, weak acid resistant, alkali resistant and general solvent, good electrical properties, self-extinguishing, non-toxic, odorless, weather resistant, and poor dyeability. The disadvantage is that the water absorption is large, affecting the dimensional stability and electrical properties, and the fiber reinforcement can reduce the water absorption rate of the resin, so that it can work under high temperature and high humidity. Nylon has a very good affinity with glass fiber.

Nylon nylon 66 has the highest hardness and rigidity, but the toughness is the worst. The various nylons are ordered according to the toughness: Pa66<Pa66/6<Pa6<Pa610<Pa11<Pa12.

The flammability of nylon is UL94v-2, the oxygen index is 24-28, the decomposition temperature of nylon is >299 °C, and spontaneous combustion occurs at 449~499 °C.

The melt activity of nylon is good, so the wall thickness of the product can be as small as 1 mm.

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