PC plastic generally refers to polycarbonate. Polycarbonate (PC) is a polymer with a carbonate group in the molecular chain. It can be classified into aliphatic, aromatic, aliphatic-aromatic, etc. according to the structure of the ester group. Types. Let's take a look at the knowledge of pc plastics.
1. Is PC plastic poisonous?
In general, plastic products are toxic, but when you use them for a short period of time, harmful substances are not released, such as disposable mineral water bottles. However, if you use it repeatedly for a long time, or add hot water, or leftover oily substances, etc., harmful substances will be released, which will cause harm to the human body.
Plastic products are divided into many types. According to chemical composition, plastic containers can be divided into PE, PP, PS, PVC, PET, NY, PC, PF, UF containers. Among them PP (polypropylene) can withstand high temperatures above 100 °C, you can choose plastic materials of this material to hold hot water.
Second, pc plastic characteristics
1, material properties
High impact strength, good dimensional stability, colorless and transparent, good coloring, good electrical insulation, corrosion resistance and wear resistance, but poor self-lubrication, stress cracking tendency, high temperature easy hydrolysis, poor compatibility with other resins . Suitable for making small parts, insulated transparent parts and impact resistant parts.
2, molding performance
(1) Amorphous material, good thermal stability, wide forming temperature range and poor fluidity. Low moisture absorption, but sensitive to water, must be dried. The molding shrinkage rate is small, and it is prone to melt cracking and stress concentration. Therefore, the molding conditions should be strictly controlled, and the plastic parts must be annealed.
(2) For the plastic parts with high melting temperature and high viscosity and more than 200g, it is advisable to use a heated extension nozzle.
(3) The cooling rate is fast, and the mold casting system is based on the principle of coarseness and shortness. It is advisable to set up a cold well, the gate should be large, and the mold should be heated.
(4) If the material temperature is too low, it will result in lack of material, the plastic parts will be dull, the material temperature will be too high, and the plastic parts will foam. When the mold temperature is low, the shrinkage rate, elongation, impact strength are high, and the bending, compressive and tensile strengths are low. When the mold temperature exceeds 120 degrees, the plastic parts are cooled slowly, and the mold is easily deformed.
Third, pc plastic modified use
The purpose of modified PC is to toughen, improve molding processing performance, reduce residual deformation, increase flame retardancy, etc. The specific varieties that can modify PC are:
PC/ABS can improve flexural modulus, heat resistance, plating performance, and the like.
PC/PET and PBT work can improve chemical resistance and solvent resistance.
Adding plexiglass to PC/PMMA improves the appearance of pearlescent color.
PC/PA and HIPS can improve impact toughness and surface finish.
PC/HDPE can improve boiling water resistance, aging resistance and weather resistance, while LDPE is inferior.
The PC is reinforced with glass or carbon fiber to improve mechanical strength.
A flammable grade PC can be prepared by using a bromine-based flame retardant and antimony trioxide.
Others and polysulfone, aromatic polycarbonate, polyoxymethylene, polypropylene, polystyrene can be blended and modified to achieve a balance between economy and performance.
use
Optical illumination
The left and right eyepiece tubes used to manufacture large lampshades, protective glasses, optical instruments, etc., can also be widely used for transparent materials on aircraft.
Electronic appliances
Polycarbonate is an excellent E (120 ° C) grade insulation material used in the manufacture of insulated connectors, coil frames, pipe sockets, bushings, telephone housings and parts, battery shells for miner's lamps, etc. It can also be used to make parts with high dimensional accuracy, such as optical discs, telephones, computers, video recorders, telephone switches, signal relays and other communication equipment. Polycarbonate thin touch is also widely used as a capacitor, an insulating bag, an audio tape, a color video tape, and the like.
Equipment
Used in the manufacture of various gears, racks, worm gears, worms, bearings, cams, bolts, levers, crankshafts, ratchets, and parts such as mechanical equipment housings, covers and frames.
medical equipment
Cups, cans, bottles, and dental instruments, drug containers, and surgical instruments that can be used for medical purposes, and even artificial organs such as artificial kidneys and artificial lungs.
Other aspects
The building is used as a double-walled hollow ribbed board, a greenhouse glass, etc.; it is used as a textile tube and a textile machine bush in the textile industry; as a bottle, tableware, toy, model, LED lamp housing and mobile phone case for daily use.
The above is the knowledge of PC plastic that I introduced for you. I hope that it will help everyone. Thank you for your attention to Jiuzhi Plastics.
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