Nylon is a polyamide fiber commonly known as nylon (Nylon), English name for polyamide (hereinafter referred to as "PA"). As first synthetic fiber developed in world, "nylon family" has a large number of members, and its applications are also very wide.
One, "lead nylon" - PA6 and PA66
Among nylon materials currently needed in world, nylon 6 and nylon 66 account for more than 95% of total, which can be said to occupy a dominant position.
1.1 Nylon 6 (PA6)
English name: Polyamide6/Nylon6; Nylon 6 (PA6), abbreviated as polycaprolactam, also known as polyamide (Polyamide-6), is a semi-crystalline granular engineering plastic with a melting point of 215–225°C and a relative density of 1.14 g/cm3.
Nylon 6 molecular chain contains an amide group (-NHCO-), a carboxyl end group (-COOH) and an amino group (-NH2).
Figure 1-1 Nylon 6 molecular formula
Nylon 6 has following characteristics:
Ø Excellent wear resistance and self-lubrication: Due to low coefficient of friction of nylon 6, it has good self-lubrication.
Ø High mechanical strength: strong intermolecular force, so it has high mechanical strength and modulus of elasticity.
Ø Excellent chemical resistance: Nylon 6 has good chemical resistance, especially oil resistance.
Ø Good heat resistance and electrical insulation: Nylon 6 has high resistivity and excellent heat resistance.
At present, nylon 6 is mainly used in production of chemical fibers and engineering plastics, of which production of chemical fibers accounts for about 70%, and production of engineering plastics for about 30%.
1.2 Nylon 66 (PA66)
English name: Polyamide66/Nylon6, referred to as PA66, also known as polyamide 66, namely polyhexamethylene adipamide. This polymeric compound containing an amide group (-NHCO-) in main chain is a translucent or transparent milky white crystal and is an important engineering resin.
Figure 1-2 Nylon 66 molecular formula
Ø It still has high strength, toughness, creep resistance and low coefficient of friction over a wide temperature range;
Ø High tensile strength, excellent wear resistance, low friction noise;
Ø High resistance to hydrocarbon solvents, especially gasoline and lubricating oils.
2. Other types of nylon
2.1 Nylon 1010 (PA1010)
English name: Polyamide1010/Nylon1010 (abbreviated as PA1010). The biggest feature of 1010 nylon is its high ductility, which can be stretched 3-4 times its original length, has high tensile strength, excellent impact resistance and low temperature resistance, does not become brittle at -60°C, and has excellent wear resistance. It is widely used in aerospace, cables, optical cables, metal or cable coating, etc. because of its high strength and good oil resistance.
2.2 Other types of nylon
Table 2-1 Other Types of Nylon Family
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