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Polycarbonate (PC) is a colorless, transparent, glassy amorphous polymer with excellent optical properties. PC high molecular resin has high toughness, cantilever beam notched impact strength is 600~900J/m. The unfilled grade has a heat distortion temperature of about 130 °C, which can be increased by 10 °C after it is reinforced with glass fiber. The flexural modulus of PC can reach more than 2400 MPa, so it can be processed into a large rigid product. Below 100 ° C, the creep rate under load is very low. PC is poor in hydrolysis resistance and cannot be used to repeatedly process articles subjected to high pressure steam.
Polycarbonate (PC) is a polyester of carbonic acid. Carbonic acid itself is not stable, but its derivatives (such as phosgene, urea, carbonate, carbonate) have certain stability.
According to the different structure of alcohol, polycarbonate can be divided into aliphatic and aromatic groups.
Aliphatic polycarbonate. For example, poly (ethylene carbonate), poly (trimethylene carbonate) and their copolymers can not be used as structural materials due to their low melting point and glass transition temperature and poor strength; However, due to its biocompatibility and biodegradability, it can be applied in drug release carriers, surgical sutures, bone support materials, etc.
Polycarbonate is resistant to weak acid, weak alkali and neutral oil.
Polycarbonate is not resistant to ultraviolet light and strong alkali.
PC is a kind of linear carbonated polyester. The carbonated groups in the molecule are alternately arranged with other groups. These groups can be aromatic, aliphatic or both. Bisphenol A PC is the most important industrial product.
PC is an amorphous polymer in almost colorless glass state with good optical properties. PC high molecular weight resin has high toughness. The notch impact strength of the cantilever beam is 600~900J/m, and the thermal deformation temperature of the unfilled grade is about 130 ° C. The glass fiber reinforcement can increase this value by 10 ° C. The bending modulus of PC can reach more than 2400MPa, and the resin can be processed into large rigid products. When the temperature is lower than 100 ° C, the creep rate under load is very low. PC has poor hydrolysis resistance and can not be used for products subject to repeated high pressure steam.
The main performance defects of PC are that its hydrolysis stability is not high enough, it is sensitive to notch, it is resistant to organic chemicals, and it has poor scratch resistance, and it will turn yellow after long-term exposure to ultraviolet light. Like other resins, PC is easily attacked by some organic solvents.
PC material is flame retardant. Antioxidant.
The three major application fields of PC engineering plastics are glass assembly industry, automobile industry, electronic and electrical industry, followed by industrial machinery parts, optical disk, packaging, computer and other office equipment, medical and health care, film, leisure and protective equipment. PC can be used as window glass, PC laminate is widely used for protective windows in banks, embassies, detention centers and public places, as well as aircraft cabin covers, lighting equipment, industrial safety baffles and bulletproof glass.
The PC panel can be used as various signs, such as the steam pump dial, the automobile instrument panel, the warehouse and the outdoor commercial signs, the point-type sliding indicator, the PC resin is used for the automobile lighting system, the instrument panel system and the interior decoration system, as the front lamp cover, the front and rear bumper with reinforcing ribs, the reflective mirror frame, the door frame cover, the operating rod cover, the choke plate, and the PC is used as the junction box, the socket, the plug and the sleeve, the gasket, and the television conversion device, Connector of communication cable under telephone line support, switch box, telephone switchboard, distribution panel element, relay housing. PC can be used as low-load parts for household electrical motors, vacuum cleaners, hair washers, coffee machines, toasters, handles of power tools, various gears, worm gears, shaft sleeves, guide gauges, and shelves in refrigerators. PC is an ideal material for optical disk storage media.
PC bottles (containers) are transparent, light in weight, good in impact resistance, resistant to certain high temperature and corrosive solution washing, and can be used as recyclable bottles (containers). PC and PC alloy can be used as computer frame, shell, auxiliary machine and printer parts. The modified PC is resistant to high-energy radiation sterilization, cooking and baking disinfection, and can be used for blood sampling instruments, blood oxygenators, surgical instruments, kidney dialyzers, etc. The PC can be used as helmet and helmet, protective mask, sunglasses and sports goggles. PC film is widely used in printing charts, pharmaceutical packaging, and film commutators.
The application and development of polycarbonate is in the direction of high composite, high function, specialization and serialization. It has launched a variety of special grade brands for various products, such as optical disk, automobile, office equipment, box, packaging, medicine, lighting, film, etc.
1. Interfacial polycondensation
The interfacial polycondensation method was the first method of industrial synthesis of polycarbonate by General Electric Company in 1958. Under normal temperature and pressure, bisphenol A first reacts with sodium hydroxide solution to generate bisphenol A sodium salt solution, then dichloromethane is added, and phosgene is introduced at a constant rate. At the interface of sodium hydroxide solution and dichloromethane solution, the material undergoes phosgenation reaction to generate low relative molecular weight polycarbonate, and then the high relative molecular weight polycarbonate is obtained through condensation reaction, washing, precipitation, filtering, drying, and granulation to obtain the final product.
The defects of interfacial polycondensation method include:
1) There are inherent defects in safety and environmental protection: raw phosgene is a highly hazardous gaseous substance, and the polymerization solvent dichloromethane is a highly hazardous substance. Once leaked, it will pollute the environment and cause harm to human health.
2) The cleaning and purification process of this process requires a large amount of water, and a large amount of wastewater is generated.
3) Phosgene, dichloromethane and acid and alkali solutions in the process are corrosive, which will corrode the equipment and shorten the service life of the equipment, and the production and maintenance are complex.
4) The chloride ion in the reaction process will also affect the product quality.
5) The solvent in the reaction process needs to be recycled, resulting in complex process and high energy consumption.
2. Melt transesterification
Melt transesterification, also known as bulk polymerization, is an indirect phosgene process, which was first designed by Bayer in Germany. This process takes phenol as raw material, and generates diphenyl carbonate (DPC) through interfacial phosgenation reaction. Under the conditions of high temperature, high vacuum and micro amount of catalyst and additives, DPC and bisphenol A undergo transesterification reaction to generate oligomer, and then polycondensation to obtain high relative molecular weight polycarbonate.
Melt transesterification method has simple process flow, friendly raw material environment, no need to use solvent, no complicated post-treatment process, and a small amount of waste water and waste gas. However, when preparing raw material DPC, this process still needs to use highly toxic phosgene. The generated Cl-containing impurities will inactivate the alkaline catalyst through neutralization reaction, which will reduce the performance of PC and also make the material yellow.
3. Non-phosgene melt transesterification
Non-phosgene melt transesterification method is developed on the basis of melt transesterification method. DPC is prepared by reaction of dimethyl carbonate DMC with phenol, and then transesterification and polycondensation with bisphenol A in molten state to prepare polycarbonate. The key technology of non-phosgene melt transesterification method comes from the technology of methanol liquid-phase oxidative carbonylation to dimethyl carbonate successfully developed by Italy Eni Company, and it is transesterified with phenol to obtain DPC.
This process does not use toxic substances, has high atomic utilization rate, and is basically pollution-free. The redundant raw materials and by-products in the production process can also be recycled, which can effectively control the production cost. It is a typical "green chemistry" cleaner production process, and also the development direction of PC technology in the future.
Keep it in a closed, cool, ventilated and dry place and store it flat.
Low-temperature injection molding PC plastic for IMD/IML process
It mainly solves the following problems: 1. inking 2. poor fluidity 3. product yellowing 4. poor compatibility with sheet and other related problems
Low temperature injection molding PC product features: 1. Super high toughness 2. High transparency 3. Ultra high fluidity 4. Good chemical resistance 5. Good compatibility with sheet
Injection temperature: low temperature injection molding PC plastic Class A injection molding temperature 220 ℃ to 240 ℃; Low temperature injection molding PC plastic Class B injection molding temperature 230 ℃ to 260 ℃.
| Nature of inquiries | Department | Location | Telephone | |
|---|---|---|---|---|
| Sales/distribution | Chinese polycarbonate sales manufacturers | China | +86-19117288062 | service@skychemwin.com |
Chemwin can provide a wide range of bulk hydrocarbons and chemical solvents for industrial customers.
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