What is the meaning of PC.PP

PC is polycarbonate Polycarbonate is the main chain of molecules containing -[O-R-O-CO]-linked thermoplastic resins, according to the molecular structure of the ester group can be divided into aliphatic, alicyclic, aliphatic an aromatic type, which has the practical value of the aromatic polycarbonate, and bisphenol A-type polycarbonate as the most important, the molecular weight is usually 3-10 million. The molecular weight is usually 3-10 million.

Polycarbonate, Polycarbonate, abbreviated as PC, PC is an amorphous, odorless, non-toxic, highly transparent colorless or yellowish thermoplastic engineering plastics, with excellent physical and mechanical properties, especially impact resistance, tensile strength, bending strength, compression strength; creep is small, dimensional stability; good heat resistance and low temperature resistance. In a wide range of temperatures with stable mechanical properties, dimensional stability, electrical properties and flame retardant, can be used for a long time at -60 ~ 120 ℃; no significant melting point, in 220-230 ℃ is molten; due to the rigidity of the molecular chain, the resin melt viscosity; small water absorption, small shrinkage, high dimensional accuracy, good dimensional stability, film permeability is small; is a self-extinguishing material; light stable, but not UV resistance, weathering. Not resistant to ultraviolet light, good weather resistance; oil, acid, not resistant to strong alkalis, oxidizing acids and amines, ketones, soluble in chlorinated hydrocarbons and aromatic solvents, long-term hydrolysis and cracking in the water is easy to cause, the disadvantage is that due to poor fatigue strength, prone to stress cracking, poor solvent resistance, poor abrasion resistance.

PC can be injection molding, extrusion, molding, blow molding, thermoforming, printing, bonding, coating and machining, the most important processing method is injection molding. Must be pre-dried before molding, moisture content should be less than 0.02%, trace moisture in the high temperature processing will make the products produce white color, silver wire and bubbles, PC at room temperature with considerable forced high elastic deformation capacity. The impact toughness is high, so it can be cold pressed, cold drawn, cold rolled and other cold molding process. Extrusion with PC molecular weight should be greater than 30,000, to use gradual compression screw, L/D ratio 1:18~24, compression ratio 1:2.5, can be used for extrusion blow molding, injection - blowing, injection - pulling - blowing method of molding high-quality, high-transparent bottles.PC alloys a wide range of types of alloys, to improve the PC melt viscosity (processability) and the products are prone to stress cracking and other defects, PC and different polymers to form alloys or **** blends, to Improve material properties. Specifically PC / ABS alloys, PC / ASA alloys, PC / PBT alloys, PC / PET alloys, PC / PET / elastomer **** blend, PC / MBS **** blend, PC / PTFE alloys, PC / PA alloys, etc., Lee has two material performance advantages, and reduce costs, such as PC / ABS alloys, PC mainly contributes to high heat resistance, better toughness and impact strength, high strength, flame retardant, ABS can improve moldability, apparent quality, reduce density.PC's three major applications are the glass assembly industry, the automotive industry and the electronics, electrical appliances industry, followed by industrial machinery parts, CD-ROMs, packaging, computers, and other office equipment, medical and health care, film, recreation, and protective equipment.PC can be used as glass for windows and doors, and PC laminates are widely used in Protective windows in banks, embassies, detention centers and public **** places, used in aircraft cabin covers, lighting equipment, industrial safety stalls and bulletproof glass. PC boards can be used for various signs, such as gasoline pump dials, automobile instrument panels, cargo and open-air commercial signs, point sliding indicators, PC resin used in automobile camera systems, dashboard systems and interior decorative systems, used as headlamp covers, front and rear automobile gear boards with reinforcing ribbing, reflective mirror frames, door frames, operating rod sheathing, flow blocking boards, PC is used as a junction box, sockets, plugs and bushings, spacers, TV conversion devices, telephone line brackets under the communication cables, PC is applied as a junction box, receptacles, plugs and sleeves, gaskets, television conversion PC is used as junction boxes, sockets, plugs and bushings, gaskets, TV converters, connectors for communication cables under telephone line brackets, electric switch boxes, telephone switchboards, switchboard components, relay housings, PC can be used as low load parts for household appliance motors, vacuum cleaners, shampooers, coffee makers, toasters, handles for power tools, various gears, worm gears, bushings, guide gauges, shelves in refrigerators, etc. PC is an ideal material for optical disc storage media. PC bottles (containers) are lightweight, good impact resistance, resistant to certain high temperatures and corrosive solution washing, as recyclable bottles (containers). pc and pc alloy can be used to make computer racks, shells and auxiliary machines, printer parts. Modified PC is resistant to high-energy radiation sterilization, boiling and baking disinfection, can be used for blood specimen collection instruments, blood oxygenator, surgical instruments, kidney dialyzer, etc. PC can be made into helmets and helmets, protective masks, sunglasses and sports eye protection. PC film is widely used in printing charts, pharmaceutical packaging, membrane commutator. PP Polypropylene Polypropylene (PP plastic) is another excellent resin varieties developed after nylon, it is a high-density, no side chain, high crystallization must be a linear polymer, with excellent comprehensive performance. Uncolored white translucent, waxy; lighter than polyethylene. Transparency is also better than polyethylene, rigid than polyethylene. PP is a semi-crystalline material. It is harder than PE and has a higher melting point. Since homopolymer-type PP is very brittle at temperatures above 0°C, many commercial PP materials are irregular ****polymers with 1 to 4% ethylene added, or pincer-type ****polymers with higher rates of ethylene content. The *** polymer type of PP material has a lower heat distortion temperature (100°C), higher transparency, low gloss, and low rigidity, but has greater impact strength.The impact strength of PP increases as the ethylene content increases.The Vicat softening temperature of PP is 150°C. Because of its higher crystallinity, this material is more brittle than other PP materials. Due to its high crystallinity, this material has good surface stiffness and scratch resistance properties.PP does not suffer from environmental stress cracking. Typically, PP is modified by adding glass fibers, metal additives, or thermoplastic rubber.The flow rate MFR of PP ranges from 1 to 40.PP materials with low MFR have better impact characteristics but lower ductile strength. For the same MFR, the impact strength of the *** polymer type is higher than that of the homopolymer type. Due to crystallization, the shrinkage of PP is quite high, generally 1.8 to 2.5%. And the directional uniformity of shrinkage is much better than materials such as PE-HD. Adding 30% glass additive can reduce the shrinkage to 0.7%. Both homopolymer-type and *** polymer-type PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and solubility. However, it has no resistance to aromatic hydrocarbon (e.g. benzene) solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents, etc. PP also does not have oxidation resistance even at high temperatures like PE.