Description:
Generally speaking, polycarbonate vinegar has no effect on grease, oil and acid. It is also stable in pure gasoline. PC polycarbonate has high transmittance, about 87%-90%, and its refractive index is 1.587, which is higher than other transparent polymers such as acrylate, so it can be used as lens optical material. Polycarbonate also has good weatherability and heat aging resistance. After two years of exposure outdoors, the properties of polycarbonate remain basically unchanged. Polycarbonate can be formed by injection, extrusion, blow molding, vacuum forming, thermoforming and other methods, often using injection, extrusion and blow molding. The melt viscosity of polycarbonate is higher than that of general thermoplastic plastics. The viscosity of polycarbonate is 104-105Pa at processing temperature, and it is sensitive to temperature. The viscosity decreases obviously with the increase of temperature. The flow characteristics of polycarbonate have little relationship with shear rate, which is similar to Newtonian fluid. Therefore, in general, the flowability of polycarbonate is improved by adjusting temperature.
Superior performance:
Polycarbonate has good mechanical properties and creep resistance, which is superior to polyphthalamine and polyformaldehyde. Especially the creep resistance of PC polycarbonate vinegar modified with glass fiber reinforced is better, so it can withstand higher load and ensure dimensional stability at higher temperature. The main shortcomings of the mechanical properties of polycarbonate are easy to produce stress cracking, poor fatigue resistance, high notch sensitivity, non-wear resistance and so on. PC has good resistance to high and low temperature. It has good heat resistance at 120 C. The hot deformation temperature is C. At the same time, it has good cold resistance, brittle temperature is - 100 C, long-term use temperature is - 70 - 120 C. Moreover, its thermal conductivity and specific heat capacity are not high, its linear expansion coefficient is small, its flame retardancy is good, and it has self-extinguishing property. PC, as a weak polar polymer, has better electrical insulation although its electrical insulation is not as good as that of polyolefins. Because of its high glass transition temperature and low hygroscopicity, it can maintain good electrical properties under wide temperature and humidity conditions.
Definition:
PC is a kind of weak polar polymer. Although its electrical insulation is not as good as that of polyolefins, it still has good electrical insulation. Because of its high glass transition temperature and low hygroscopicity, it can maintain good electrical properties under wide temperature and humidity conditions. Especially its dielectric constant and dielectric loss are close to constant in the range of 10-130 C, so it is suitable for manufacturing capacitors. PC polycarbonate has certain chemical resistance. Resistance to water, organic acid, dilute inorganic acid, oxidant, salt, oil, aliphatic hydrocarbons and alcohols at room temperature. But it is corroded by alkali, amine, ketone, ester and aromatic hydrocarbon, and dissolved in trimethane, dichloroethane, cresol and other solvents. Long-term immersion in boiling water also causes hydrolysis. Stress cracking may occur in polycarbonate in some chemical reagents such as carbon tetrachloride.