The strength of polyamide fiber is 1-2 times higher than that of cotton, 4-5 times higher than that of wool, and 3 times higher than that of viscose fiber. However, the heat resistance and light resistance of polyamide fiber are poor, and the retention is also poor. The clothes made of polyamide fiber are not as neat as those made of polyester fiber. In addition, the nylon – 66 and nylon – 6 used for clothing have the disadvantages of poor moisture absorption and dyeing. Therefore, a new variety of polyamide fiber, the new polyamide fiber of nylon – 3 and nylon – 4, has been developed. It has the characteristics of light weight, excellent wrinkle resistance, good air permeability, good durability, dyeing and heat setting, etc., so it is considered to be very promising.
This kind of product is widely used. It is a good material to replace steel, iron, copper and other metals with plastics. It is an important engineering plastic; Cast nylon is widely used to replace the wear-resistant parts of mechanical equipment and copper and alloy as wear-resistant parts of equipment. It is suitable for making wear-resistant parts, transmission structure parts, household electrical appliance parts, automobile manufacturing parts, screw rod prevention mechanical parts, chemical machinery parts and chemical equipment. Such as turbine, gear, bearing, impeller, crank, instrument panel, drive shaft, valve, blade, screw rod, high-pressure washer, screw, nut, seal ring, shuttle, sleeve, shaft sleeve connector, etc.