Definition:
The polymer containing carbonate group in PC resin molecular main chain is called polycarbonate. Because of the rigidity of polycarbonate molecular main chain and the volume effect of benzene ring, its crystallization ability is poor. It belongs to amorphous polymer and has excellent transparency. The ester groups in the main chain of PC polycarbonate are sensitive to water, especially hydrolysis at high temperature. A transparent, yellowish, tough solid. Its density is 1.209/cm3, transmittance can reach 90%, non-toxic, odorless, odorless, and has high dimensional stability, uniform shrinkage and self-extinguishing. Polycarbonate PC is a rigid and tough material with excellent mechanical properties. The tensile strength, bending strength and compressive strength are all higher, and are less affected by temperature. Especially its impact performance is very outstanding, which is superior to general engineering plastics.
The basic materials of CD:
In recent years, with the rapid development of information industry, the application of optical media has promoted the rapid growth of polycarbonate. At present, the consumption of polycarbonate in the world CD manufacturing industry has exceeded 20% of the total consumption of PC, with an average annual growth rate of more than 10%. According to the figures released by the State Administration of Press and Publication, there were 748 CD-ROM production lines in China in 2002. The annual consumption of optical grade polycarbonate was about 80,000 tons and all of them were imported. Therefore, the application prospect of polycarbonate in the field of optical disk manufacturing is very broad. Optical lens material: Polycarbonate has a very broad application market in the field of optical lens because of its unique characteristics of high transmittance, high refractive index, high impact resistance, dimensional stability and easy processing and forming. Among them, the annual growth rate of PC consumption in the world's eyeglasses industry has remained above 20%, showing great market vitality.
Purpose:
Automobile manufacturing industry: PC has shock resistance, thermal distortion resistance, good weatherability and high hardness. It is suitable for producing various parts of cars and light trucks. With the rapid development of China's automobile industry, the application of polycarbonate in this field has great potential.
Electronics and Electrical Industry: Polycarbonate is an excellent insulating material because of its good and constant electrical insulation in a wide range of temperature and humidity. At the same time, its good flame retardancy and dimensional stability make it widely used in the electronics and electrical industry. Building Material Industry: Polycarbonate sheet has good light transmittance, impact resistance, ultraviolet radiation resistance and dimensional stability of its products and good processability, which makes it have obvious technical advantages over inorganic glass used traditionally in construction industry. At present, there are more than 20 production lines of polycarbonate building materials hollow board in China, with an annual demand of about 70,000 tons of polycarbonate. It is expected to reach 140,000 tons by 2005.