Polycarbonate plastic, a polycarbonate-based plastic. Polycarbonate is an amorphous polymer that turns into a transparent glass after melting and cooling, and has excellent optical and mechanical properties. It has a high melting point, low temperature resistance, low water absorption, good impact resistance, insulation and aging resistance, and can withstand inorganic and organic dilute acids.
Polycarbonate can be used to make signs, instrument housings, furniture, car lights, electrical parts, instrumentation panels, and more. The use of polycarbonate as a disc substrate has been greatly increased.
Polycarbonate greenhouse plastic have a low tendency to crystallize and have no precise melting point and are generally considered to be amorphous plastics. The glass transition temperature is relatively high, 149 to 150 ° c, the melting temperature is 215 to 225 ° c, and the molding temperature can be controlled at 250 to 310 ° c.
The thermal stability and mechanical strength of polycarbonate increase with the increase of relative molecular mass, and the melt viscosity also increases significantly with the increase of relative molecular mass. The relative molecular mass of polycarbonate used for injection molding is generally 20,000 to 40,000.
The melt viscosity of polycarbonate is much larger than that of nylon, polystyrene, and polyethylene, which has an effect on injection molding because the flow length is shortened as viscosity increases. Its flow characteristics are close to newtonian fluids, the melt viscosity is less affected by the shear rate, and it is very sensitive to temperature changes. Therefore, it is more effective to lower the viscosity by increasing the temperature during the injection molding process than increasing the pressure.