Type of nylon: A type of thermoplastic resin containing an amide group (—CONH—) in a repeating structural unit of a nylon-based molecular main chain, including an aliphatic polyamide, a fat-aromatic polyamide, and an aromatic polyamide. Aliphatic polyamides have many varieties, large yields and wide applications, and can be used as both fibers and plastics. The fat-aromatic polyamide has a small variety and a small yield; the aromatic polyamide is often referred to as a polyaramid, and is mainly used as a fiber (aramid).

Aliphatic nylon is divided into nylon 6, nylon 66, nylon 1010 and the like.

In fact, nylon 6 and nylon 66, the difference is not big. The reason why both of them were produced was because DuPont had applied for a patent after the invention of nylon 6,6, so other companies invented nylon 6 in order to produce nylon. Nylon is the most common man-made fiber. In 1940, nylon stockings made of nylon were popular, and nylon became famous. Since then, during World War II, nylon was heavily used to weave parachutes and ropes. However, the original use of nylon was to make the bristles of a toothbrush.

Nylon is a polyamide with an amino group in its main chain. The amino groups have polarities and attract each other due to the action of hydrogen bonds. Therefore, nylon is easily crystallized and can be made into fibers of high strength. The polyamide is a tough horny translucent or milky white crystalline resin, and is usually made into a cylindrical pellet. The molecular weight of the polyamide used for plastics is generally 15,000 to 20,000.

The common characteristics of various polyamides are flame resistance, high tensile strength (up to 104 MPa), wear resistance, good electrical insulation, heat resistance (heat deformation temperature above 455 kPa at 150 ° C), melting point 150-250 ° C, melting The resin has high fluidity, and the relative density is 1.05 to 1.15 (the filler can be increased to 1.6), and most of them are non-toxic.

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