PA plastic (nylon, polyamide), English name: Polyamide PA has a wide variety of PA, there are PA6, PA66, PAll, PAl2, PA46, PA610, PA612, PA1010, etc., as well as many new varieties of semi-aromatic nylon PA6T and special nylon developed in recent years. PA plastic is a long history, widely used general engineering plastics, the world engineering plastics market in 2000 was allocated as PA35%, PC32%, POM11%, PBT1O%, PPO3%, PET2%, UHMWPE2%, high-performance engineering plastics (PPS polyamide, LCP, PEEK, PEI, PESU, PVDF, other fluorine-containing plastics, etc.) 2%.
1、Crystalline material, high melting point, narrow melting temperature range, poor thermal stability, material temperature over 300 degrees, retention time of more than 30 minutes is decomposition. Easier to absorb moisture, need to dry, water content should not exceed 0.3%.
2, good fluidity, easy to overflow material. Suitable for self-locking nozzle, and should be heated.
3, molding shrinkage range and shrinkage rate is large, the direction is obvious, easy to occur shrinkage, deformation, etc.
4、Mold temperature is selected according to the wall thickness of the plastic part within the range of 20-90 degrees, injection pressure is selected according to the type of injection machine, material temperature, shape and size of the plastic part, mold pouring system, molding cycle is selected according to the wall thickness of the plastic part. When the resin viscosity is small, the injection and cooling time should be long, and use
white oil as demoulding agent.
5, the form and size of the mold casting system, increase the size of the runner and gate can reduce shrinkage. The shortcomings of polyamide are: insufficient dimensional accuracy due to thermal expansion and water absorption, poor acid resistance, insufficient hardness and elastic modulus. After improvement, it is also
It is one of the better engineering plastics.
For automobile manufacturing
Used in the manufacture of fuel screens, fuel filters, cans, traps, reservoirs, engine cylinder head covers, radiator cylinders, and balance rotating shaft gears. It can also be used in electrical parts and terminal blocks of automobiles. In addition, it can also be used as drive and control parts, etc.
Electrical and electronic industry
It can be used in the manufacture of rice cookers, electric vacuum cleaners, high-frequency electronic food heaters, terminal blocks for electrical products, switches and resistors, etc.
Medical apparatus and instruments
It is used for medical blood vessels, blood extractors, infusion sets, etc. PA monofilament can be used for surgical sutures, wigs, etc. In addition, it is used for digital rotating discs of electronic typewriters, terminal blocks, transmission gears, belt filters of printing machines, etc.
It is used to make disposable lighter body, alkaline dry battery liner, motorcycle driver's helmet, office machine shell, corner wheel, seat and backrest of office chair, ice skates, fishing line, etc. PA film has excellent gas barrier performance, and oil resistance, low temperature impact resistance, good penetration resistance.
PA film has excellent gas barrier performance, and oil resistance, low temperature impact resistance, good penetration resistance, and can be used for meat, ham sausage and other frozen food packaging. Polyamide can also be rods and plates, but also for gears or other transmission devices.