Application fields and new research findings of polycarbonate PC raw materials
The production of polycarbonate (PC) is very complex. In the past, only a few large chemical giants in the world have the production methods and capabilities. Domestic manufacturers of polycarbonate (PC) are all foreign or joint ventures. With the increase of demand for polycarbonate (PC) in the construction and automobile industries, China is increasing the scale of investment in polycarbonate (PC) production. In 2019, the global production capacity of polycarbonate (PC) will exceed 5.6 million tons.
Bisphenol a polycarbonate (PC) is widely used in construction, electronics, automobile, medical and other national economic fields because of its advantages of good transparency, strong impact strength, good thermal stability, creep resistance, good cold resistance, good electrical insulation, and good flame retardance.
Polycarbonate (PC) is an engineering plastic. It is a colorless, odorless, transparent and amorphous thermoplastic polymer. Polycarbonate (PC) can be divided into aliphatic, alicyclic and aromatic groups. Due to the limitations of processing performance, production cost and other factors, bisphenol A aromatic polycarbonate (PC) can be industrialized on a large scale.
Polycarbonate (PC) | Main application fields
Building materials (sunlight board, endurance board, wave tile, curtain wall connector board)
Since ancient times, glass has been the main lighting material in modern life. The roof of large-area buildings requires "light weight and high strength". The high strength and low density of polycarbonate (PC) make up for the brittleness of glass. It has the advantages of high safety, simple installation and strong designability, and occupies a place in the field of contemporary architecture. The advantages of materials alone are not enough to complete a magnificent building. Just as cement needs to be reinforced, polycarbonate (PC) as a building material also adds a lot of design.
With the progress of production technology and process of polycarbonate (PC) board, as a new material, polycarbonate (PC) hollow board has injected many new architectural elements into the roof, wall and curtain wall of buildings. This kind of board, also known as "sunlight board", can penetrate most of the visible light and block most of the infrared and ultraviolet rays. After the natural light passes through the flat panel, it forms a soft diffuse reflection in the room, which is not dazzling. It is widely used in industrial workshops, gymnasiums, exhibition halls, airports and other large space and deep buildings.
Polycarbonate (PC) board has excellent energy-saving effect and is considered as a green building material. EnergyPlus software is used to simulate the energy consumption of a building in Shanghai and calculate the energy consumption cost. The results show that the annual cost of polycarbonate (PC) multilayer window can be saved by 6.2~36.6 yuan/m2 compared with double glass window.
Polycarbonate (PC) has good insulation and strength in a wide range of temperature and humidity. It is widely used as the shell, shell and structural part of various commercial electrical appliances of computers. It can be used to make insulating sleeve, coil rack, electric tool shell, refrigerator drawer, vacuum cleaner parts, etc. It can be used to manufacture parts with high dimensional accuracy, such as computer, video recorder, TV switch, relay and other important parts in communication equipment. Its color-light transparency, light scattering and dimensional stability are applied to large-screen LCD diffusers above 42 inches. Polycarbonate (PC)/ABS alloy can reduce cost, and has machinability and UV resistance. It can be used to produce thin-walled parts of injection molding notebook computers and notebook computers.
The traditional windows and skylights are being replaced by polycarbonate (PC) materials, and the low density is one of the reasons for this change. The excellent processing performance of plastics can enable automotive developers and designers to innovate. The highly curved polycarbonate (PC) plate is combined with the body to improve aerodynamic efficiency. Fiat 500L windows show the strong competitiveness of polycarbonate (PC) materials in this field. The development potential of polycarbonate (PC) skylight is huge. Every three cars produced in China will be equipped with skylights and panoramic skylights. High heat-resistant polycarbonate (PC) can be directly vacuum sprayed with metal for the production of condenser and reflector parts.
In the lighting system, polycarbonate (PC) can be used to produce complex headlights, tail lights and turn signals to improve impact resistance. Polycarbonate (PC) is adopted, and the mass of front lamp cover is 0.5~1.4kg lower than that of inorganic glass. Polycarbonate (PC) alloy has high mechanical properties and good appearance. Mainly used for automobile assembly and interior parts. For example, polycarbonate (PC)/ABS alloy has excellent heat resistance, impact resistance and rigidity, and good processing fluidity and finish. It is an ideal material for manufacturing automobile dashboard. The manufactured instrument panel can be directly sprayed with soft finish paint and coated with PVC film without surface pretreatment.
Medical apparatus and instruments
Typical medical applications include high-pressure syringes, dental tools, surgical masks, blood oxygenators, blood samplers, blood separation equipment, surgical equipment, kidney dialysis equipment, venous components and medical centrifuges. Whether polycarbonate (PC) can withstand high-energy radiation and high temperature disinfection without losing physical properties and yellowing, improving chemical resistance and preventing cracking is the key issue for polycarbonate (PC) to expand its application in this field.
Bayer has launched a variety of new medical products, including markrolon2258, markrolonrx2435 and markrolonrx2440. Makrolon rx2440 is a new transparent, high-mobility medical polycarbonate (PC) material with good biocompatibility γ The color recovery time of ethylene oxide steam sterilization by X-ray electron beam irradiation is faster than that of ordinary polycarbonate (PC), which can be used in various medical devices, such as intravenous injection, respiratory tract, surgery, kidney treatment, etc.
Kos recently released Makrolon rx3440, which is resistant to solvents in tumor treatment and cleaning agents. The durability and chemical resistance of this medical polycarbonate (PC) product help prevent cracking and enable medical professionals to safely inject drugs into tumor patients., Styron has launched emerge polycarbonate (PC)/pet9100cr alloy products, which can meet the chemical resistance under extreme conditions without plastic surface decomposition, crack, fracture and other phenomena.
Polycarbonate (PC) can be used in film and optical lens packaging. The thinnest film thickness can reach 0.03 mm. It is tasteless, non-toxic, highly transparent, colorless and light yellow. It has many functions, such as flame retardant, printing grade, anti-scratch, anti-static, etc. It can be used for power system insulation, special printing, mobile phone and other electronic products window glass. Optical-grade polycarbonate (PC) can be used to manufacture optical lenses and glasses for advanced cameras, cameras, microscopes and telescopes, with excellent impact resistance. In terms of packaging, it is mainly used for large-capacity reusable water bottles and food utensils.
Polycarbonate (PC) | Latest research progress
According to the existing literature, the research hotspots in the field of polycarbonate (PC) mainly include the development of flame retardants and composites. On the one hand, electronic and electric fields require polycarbonate (PC) materials to have stability and flame retardance when they are thin. In high-end fields such as sensors, solar cells, touch screens, displays, smart windows, etc., polycarbonate (PC) as matrix material shows certain application prospects.
Polycarbonate flame retardant
There are many kinds of polycarbonate (PC) flame retardants. In the early stage, there were sulfonate flame retardants, organophosphorus flame retardants, bromine flame retardants, organosilicon flame retardants, inorganic flame retardants, etc., with their advantages and disadvantages. At present, the trend of market products is halogen-free. Sulfonate flame retardant mainly has high thermal deformation temperature and temperature index. The flame retardant grade of modified polycarbonate (PC) material is generally UL94V-0 (1.0 ～ 1.5mm).
With the development of society, people require electronic equipment to be practical, safe and beautiful., Thin wall and good appearance are the future development trend, which requires halogen-free flame-retardant polycarbonate (PC) to reach a high flame retardant level and have good mechanical properties, glossiness, thermal properties and processing properties. It is the direction of enterprise research institutions to develop new flame retardants and combine flame retardants to meet the comprehensive performance requirements of various materials.
The polyphosphate polymer hm1100 developed by American frxpolymers company is used as polycarbonate (PC) flame retardant to make the flame retardant level reach 1.0mm V-0 level. Compared with bisphenol a diphenyl phosphate (BDP), the thermal deformation temperature of BDP under high load (1.82 mpa) will be greatly increased, up to 123 ℃, indicating that BDP has high hydrolysis resistance.
Composite polycarbonate (PC) material
Polycarbonate (PC) has excellent mechanical and optical properties and is an ideal matrix material. The current research includes: modifying polycarbonate (PC) to enhance the composite ability of other materials; Add carbon black, carbon fiber, carbon nanotubes and graphene to make it conductive; As the substrate of the film, it can be compounded with the film material.
SABIC is a world-class petrochemical enterprise with strong R&D capabilities in the field of thermoplastic plastics. The company has developed a new type of polycarbonate (PC) resin with special groups on the main chain, which can be directly combined with carbon fiber without using conventional silane coupling agent to modify carbon fiber, which is innovative.
The research of Zhengzhou University found that the transparent conductive film of SWNTs/MWNTs/polycarbonate (PC) was prepared continuously by using polycarbonate (PC) (PC) as the substrate, multi-wall carbon nanotubes (MWNTs) and single-wall carbon nanotubes (SWNTs) as conductive particles, and through the self-designed roll-to-roll (R2R) spraying device. The results show that the system has good flexibility and color transmittance control. It has important reference value for the development of flexible intelligent windows.
Analysis of advantages and disadvantages of polycarbonate (PC) application prospect
At present, the production process of polycarbonate (PC) mainly includes ester exchange method and phosgene method. The former needs to store phenol with high boiling point, while phenol is difficult to reach high molecular weight. The latter uses highly toxic raw material phosgene in the reaction process, which puts forward high requirements for technology and safety. If phenol itself is toxic, the entry threshold of polycarbonate (PC) production makes it monopolistic.
Polycarbonate (PC) is a kind of engineering plastics with excellent comprehensive properties, which has high strength, high ductility and high toughness, excellent impact strength, excellent electrical properties, good light transmittance and more than 90% light transmittance. The research on its flame retardancy has been relatively mature, and many alloy materials have chosen polycarbonate (PC) as one of the modifiers.
The thermal insulation performance of polycarbonate (PC) is 125 times that of ordinary glass, its impact strength is 250 times that of glass, and its density is half that of glass. It has great application potential in the construction industry.
Polycarbonate (PC) is easy to process molds and can replace some existing automobile parts to achieve the purpose of weight reduction and energy saving. The use of polycarbonate (PC) in China's automobile industry accounts for 5% of the total consumption, which has a large development space compared with 20% in foreign countries.
In the electronic and electrical industry, polycarbonate (PC) has maintained a strong consumption growth for a long time due to its high impact resistance, high thermal deformation temperature, insulation, fire resistance and dimensional stability.
Given that China imports billions of polycarbonate (PC) and polycarbonate (PC) raw materials to meet the demand every year, the market prospect is optimistic.
Polycarbonate (PC) machines are widely used, with many competitors and high cost, and have been replaced in many application fields. For example, low-cost acrylonitrile resin (SAN) is used for the preservation room and refrigerator protective layer with low requirements on temperature and impact strength.
Transparent PP, pet and PVC are competitive in the use of containers. In the field of food utensils, polycarbonate (PC) products that can be used as water bottles and baby bottles are considered to contain bisphenol A, which is restricted in some countries (such as the European Union, Canada and the United States). Polycarbonate (PC) products are moving towards, and high-end fields, which puts forward higher and broader requirements for its new product development capability and application field exploration.
Human beings are in the era of new materials. The development and utilization of materials is the concern and consideration of every material scientist. Polycarbonate (PC) plastics are favored for their excellent mechanical, optical and thermal properties. It has matured in high-end application fields such as electronic products, auto parts, medical equipment and modern architecture, providing strong support for its future development. Driven by economic globalization, the improvement of people's material needs has promoted the sustainable development of polycarbonate (PC), a competitive product at home and abroad.