UHMW polymer applications are similar to Polyamide and PTFE
Ultra-high molecular weight polyethylene English ultra-high molecular weight polyethylene (referred to as UHMWPE), is a molecular weight of 1.5 million -9 million polyethylene.
UHMWPE features: excellent wear resistance·, good low-temperature impact resistance, self-lubrication, non-toxic, water, chemical resistance, heat resistance than general PE, the disadvantage is heat resistance (Hyper-deformation temperature) is low, processing and forming properties are poor, external surface hardness, rigidity, and creep resistance are not as good as general engineering plastics, and the coefficient of expansion is large.
UHMWPE has poor fluidity and high viscosity in the molten state. It is a rubbery, highly viscous elastomer that was only formed by pressing and sintering in the early stages. It can also be processed by extrusion, injection molding and blow molding.
UHMWPE can replace carbon steel, stainless steel, bronze and other materials used in textile, paper, food machinery, transportation, medical, coal, chemical and other departments. Such as the textile industry, technical shuttles, shuttles, gears, couplings, flower sweeping rods, buffer blocks, eccentric masses, rod bushings, oscillating consequences and other impact wear parts. Paper-making industry to make the sealing shaft, deflector wheel, scraper, filter, etc. of the box cover, wiper board, compaction parts, joints, transmission machinery, etc.; hoppers, silos, chutes for powder material in the transportation industry Lining.
UHMWPE can do all kinds of mechanical parts, including food machinery gears, worm gears, worm gears, and bearings. In the chemical industry, pumps, valves, baffles, and filter plates are used. Medically, it can also be used for heart valves, short surgical parts, artificial joints and birth control implants. Sports skating floors, earth roads, snowboards, and motorized ski parts. UHMWPE can make high-modulus fibers, and manufacture body armor, aircraft seats, marine and fishing ropes.
Mechanical properties are higher than normal high density polyethylene. Has outstanding impact resistance, stress crack resistance, high temperature creep resistance, low friction coefficient, self lubrication, excellent chemical resistance, fatigue resistance, noise damping, nuclear radiation resistance.
The use of temperature 100 ~ 110 °C. Good cold resistance, can be used at -269 °C. The product with a density of 0.935 g/cm3 and a molecular weight of 2 million has a tensile strength at break of 40 MPa, an elongation at break of 350%, a flexural modulus of elasticity of 600 MPa, and a cantilever beam impact impulse. Wear amount (MPC method) 20mm.
In the presence of a Ziegler catalyst, ethylene or ethylene is polymerized with alpha-olefins.
Its application range is similar to polyamide and PTFE, its wear resistance exceeds that of carbon steel, and it makes gears, bearings, bearings, star wheels, valves, pumps, guide rails, seal packings, equipment linings, sliding plates, artificial joints, etc. For body armor, ropes, etc.