PC plastic generally refers to polycarbonate, polycarbonate (referred to as PC) is a molecular chain containing carbonate ester group of polymers, according to the structure of the ester group can be divided into aliphatic, aromatic, aliphatic-aromatic, and so on a variety of types. So what about PC plastic, is PC plastic toxic? Follow us below to find out.
PC plastic is toxic?
Generally speaking, plastic products are toxic, but when you use it for a short period of time, the harmful substances will not be released, such as single-use mineral water bottles and so on.
But if you use it repeatedly over a long period of time, or add hot water, or leftover oily substances, etc., the harmful substances will be released, thus harming the human body.
Plastic products are divided into many types, according to the chemical composition, plastic containers can be divided into PE, PP, PS, PVC, PET, NY, PC, PF, UF containers and so on. Among them, PP (polypropylene) can withstand high temperatures of more than 100 ℃, you can choose plastic products made of this material to hold hot water.
PC plastic characteristics:
1, material properties
High impact strength, good dimensional stability, colorless and transparent, good coloring, electrical insulation, corrosion resistance, good abrasion resistance, but self-lubrication is poor, there is a tendency of stress cracking, high temperature easy to hydrolyze, and other Poor compatibility with other resins. Suitable for the production of instrumentation small parts, insulation and transparent parts and impact parts.
2, molding performance
(1) amorphous material, good thermal stability, wide range of molding temperature, poor fluidity. Moisture absorption is small, but sensitive to water, must be dried. Molding shrinkage is small, easy to melt cracking and stress concentration, so the molding conditions should be strictly controlled, the plastic parts shall be annealed.
(2) high melt temperature, high viscosity, greater than 200g of plastic parts, it is appropriate to use heated extension nozzle.
(3)Cooling speed, mold pouring system to coarse, short for the principle, it is appropriate to set up a cold material well, the gate is appropriate to take a large, the mold is appropriate to heat.
(4) material temperature is too low will cause the lack of material, plastic parts without luster, material temperature is too high is easy to overflow edge, blistering plastic parts. Mold temperature is low shrinkage, elongation, high impact strength, bending, compression, tensile strength is low. When the mold temperature exceeds 120 degrees, the cooling of plastic parts is slow and easy to deform and stick to the mold.
PC plastic use:
Optical Lighting
Used in the manufacture of large lampshade, protective glass, optical instruments, left and right eyepiece lens barrels, etc., but also can be widely used in the aircraft on the transparent material.
Electronic appliances
Polycarbonate is an excellent E (120 ℃) level insulating materials, used in the manufacture of insulated connectors, coil frames, tube holders, insulated bushings, telephone shells and parts, battery shells of the lamps and so on. Can also be used for the production of very high dimensional accuracy of the parts, such as optical disks, telephones, electronic computers, video recorders, telephone exchanges, signal relays and other communications equipment. Polycarbonate thin touch is also widely used as capacitors, insulating bags, audio tapes, color video tapes and so on.
Mechanical equipment
Used in the manufacture of a variety of gears, racks, worm gears, worm gears, bearings, cams, bolts, levers, crankshafts, ratchets, but also for some mechanical equipment shells, covers and frames and other parts.
Medical equipment
Cups, cylinders, bottles and dental instruments, drug containers and surgical instruments for medical purposes, and even as artificial kidneys, artificial lungs and other artificial organs.
Other
Architecture used as hollow rib double-wall panels, conservatory glass, etc.; in the textile industry used as textile yarn tubes, textile machine shaft tiles, etc.; daily use for bottles, tableware, toys, models, LED lights shell and cell phone shells, etc..
PC plastic modification purposes:
The purpose of PC modification is to toughen, improve molding and processing performance, reduce residual deformation, increase flame retardant, etc., specific varieties of PC modification:
PC/ABS can improve the bending modulus, heat resistance, electroplating properties.
PC/PET, PBT workers can improve drug resistance, solvent resistance.
PC/PMMA can be added to organic glass to improve the appearance of pearl color.
PC/PA, HIPS can improve the impact toughness, surface finish.
PC/HDPE can improve boiling water resistance, aging resistance, weather resistance, while LDPE is less effective.
PC with glass fiber or carbon fiber to enhance the modification, improve mechanical strength.
And with bromine flame retardants and antimony trioxide, can be made of flame retardant grade PC.
Other and polysulfone, aromatic polycarbonate, polyformaldehyde, polypropylene, polystyrene can be **** blend modification, to achieve a balance between economy and performance.