Polyamide
Polyamide (PA, common name: nylon) has won people's attention due to its unique low specific gravity, high tensile strength, wear resistance, good self-lubricating properties, excellent impact toughness, and the combination of flexibility and flexibility. High, light weight (only 1/7 of metal), can be processed into various products instead of metal, widely used in the automotive and transportation industries. Typical products include pump impellers, fan blades, valve seats, bushings, bearings, various instrument panels, automotive electrical instruments, hot and cold air conditioning valves, etc., each of which consumes 3.6 to 4 kg of nylon products. Polyamide has the largest consumption ratio in the automotive industry, followed by electrical and electronic.
Polyamide modification can be divided into reinforcement, toughening, flame retardant, filling and alloy types. Great progress has also been made in the study of polyamide nanocomposites.
In order to obtain a polyamide material having a higher strength and a heat distortion temperature, an inorganic or organic fiber or a filler is added to a polyamide matrix, and a high-strength polyamide composite material is obtained by a blend extrusion method. There are many varieties of enhanced PA, and almost all polyamide materials can be made into enhanced varieties.
The main commercial varieties are: enhanced PA6, enhanced PA66, enhanced PA46, enhanced PA1010, enhanced PA610 and so on. The largest production is enhanced PA6 and PA66. Commonly used polyamide reinforcing materials are glass fiber, carbon fiber, aramid fiber, and inorganic whiskers are also used for the reinforcement of polyamide.