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Introduction and application of polycarbonate (PC)

2018-5-5   

Introduction: polycarbonate is A thermoplastic resin containing -- [o-r-o-co] -- chain segments in the molecular hairy chain. It can be divided into fat rotation, lipocyclic and adipo-aromatic groups according to the different esters in the molecular structure. Among them, the aromatic polycarbonate with practical value is the polycarbonate, and bisphenol A polycarbonate is the most important. The molecular weight is usually 3-100,000.

Polycarbonate, or PC as it is known in English.PC is an amorphous, odorless, non-toxic and highly transparent colorless or yellowish thermoplastic engineering plastic with excellent physical and mechanical properties, especially excellent impact resistance, high tensile strength, bending strength and compression strength.Small creep and stable size;Has good heat resistance and low temperature resistance, in relatively wide temperature range has the stable mechanical properties, dimensional stability, electrical properties and flame retardancy, can use for a long time under the 60 ~ 120 ℃;No obvious melting point, in 220-230 ℃ in the molten state;As the molecular chain is rigid, the viscosity of resin melt is large.Low water absorption, small shrinkage, high dimensional accuracy, good dimensional stability, small film permeability;Self-extinguishing material;Stable to light, but not uv light, good weather resistance;Resistant to oil, acid, strong alkali, oxidative acid, amine and ketone, soluble in chlorinated hydrocarbons and aromatic solvents, hydrolysis and cracking are easy to be caused in water for a long time. The disadvantages are poor fatigue strength, stress cracking, poor solvent resistance and poor wear resistance.PC can injection molding, extrusion, moulding, blow molding hot molding, printing, adhesion, coating and machining, the most important processing method is injection molding.The moisture content should be less than 0.02%. The processing of trace moisture at high temperature will cause the products to produce turbidity color, silver silk and air bubbles. PC has considerable forced high-elastic deformation capacity at room temperature.High impact toughness, therefore, can be cold-pressed, cold-drawn, cold-rolled and other cold molding.The molecular weight of PC for extrusion should be more than 30,000, and the screw rod with gradual compression should be adopted. Its length-diameter ratio is 1:18-24, and its compression ratio is 1:2.5. It can be extruded and blown.

There are various kinds of PC alloys, which can improve the defects such as high viscosity of PC melt (processed type) and easy stress cracking of products. PC forms alloy or blend with different polymers to improve the properties of materials.Specific have PC/ABS alloy, PC/ASA alloy, PC/PBT alloy, PC/PET alloy, PC/PET/elastomer blend, PC, PC/MBS blend/PTFE alloy, PC/PA alloy, etc., there are two kinds of material performance advantages, and lower costs, such as PC/ABS alloy, PC main contribution to the high heat resistance, good toughness and impact strength, high strength, flame retardancy, ABS can improve the formability and table quality, reduce the density.The three major application fields of PC are glass assembly industry, automobile industry and electronics and electrical industry, followed by industrial machinery parts, optical disk, civil decoration, computer and other office equipment, medical and health care, thin film, leisure and protective equipment.The PC can be used as window glass, and the PC laminate is widely used in the protective Windows of Banks, embassies, detention centers and public places.PC board to do all kinds of signs, such as gasoline pump dial, car dashboard, warehouses and open business signs, point slide indicator, PC resin used in car camera system, the dashboard system and internal decoration, as a former chimney, with stiffener plate before and after the car, reflective frame, door frame, operating lever sheath, choke plate, PC is used as a junction box, socket, plug and sleeve conversion device, gasket, TV, telephone line support under the communications cable connectors, electrical brake chamber, the switchboard, switchboard components, relay case, PC can do low load, parts, used in home appliances motors, vacuum cleaners,Hair washers, coffee machines, toasters, power tools handle, all kinds of gear, worm wheel, shaft sleeve, guide, refrigerator shelf.PC is the ideal material for CD storage medium.PC bottle (container) is transparent, light in weight, good in shock resistance, high temperature resistance and corrosion solution washing.PC and PC alloy can do computer rack, shell and auxiliary machine, printer parts.The modified PC can be used for high-energy radiation sterilization, steaming and baking sterilization, blood sampling apparatus, blood oxygenator, surgical instruments, kidney dialyzer, etc., PC can be used for helmet and helmet, protective mask, sunglasses and sports shield.PC film is widely used in printing charts, pharmaceutical packaging, membrane commutator.