pc/absPerformance characteristics:
Polycarbonate (PC).It is a thermoplastic engineering plastic with excellent comprehensive properties, which has the characteristics of high temperature resistance, flame retardancy and electrical insulation, dimensional stability, non-toxic and tasteless.
However, PC also has the disadvantages of high melt viscosity, poor fluidity, sensitivity to notch, easy stress cracking, poor resistance to organic chemicals, and high quality, which limits its application in many fields.
absAcrylonitrileButadieneStyrene
absCombining the properties of the three monomers, its low temperature impact resistance, chemical resistance and molding processing performance are good, relatively cheap, and are widely used in automobiles, electrical appliances, instrumentation and other fields, but it existsFlame retardancy, high temperature resistance and weather resistance are poorand other shortcomings.
PC and ABSAdvantages of blending
PC ABS alloy combines the excellent properties of the two polymers and improves the shortcomings of PC and ABS in some properties.
Compared to pure PC, PC ABS alloyThe fluidity is improved, the processing performance is better, and the stress sensitivity of the product is reduced.
Compared to pure ABS, PC ABSMechanical properties, heat resistance, flame retardant propertiesIt is widely used in the production of automotive interior parts, communication equipment, electronic appliances, lighting equipment, etc.
Theoretical basis of PC ABS alloy blending
In order to ensure excellent blending effect, five principles should be considered when blending different types of polymer materials: polarity matching, similar surface tension and diffusion capacity, equal viscosity, and similar solubility parameters.
In addition, it is necessary to consider the process compatibility of two-phase materials, that is, the inherent possibility that the two phases will either be mixed, separated, or have a phase transition at a certain temperature and pressure.
In order to improve the compatibility between polymers and improve the mechanical properties of alloy materials, the most effective method is to add compatibilizers to the blending system.
Because the compatibilizer can reduce the surface tension between the polymers and the particle size of the dispersed phase, increase the thickness of the interface layer, improve the stability of the blended structure, and thus improve the mechanical properties of the alloy.
The development trend of PC ABS alloys
At present, PC ABS alloy technology fills the gap in the performance of single variety plastics with its special properties, and the research on PC ABS alloying has become a hot spot in polymer alloy research.
(1) PC ABS alloy will develop to high performance and functionalization, and its application field will continue to expand.
After decades of exploration and development, PC ABS alloy has made great progress. With the increasing expansion of the application field of polymer materials and the improvement of the performance requirements of the materials used in industrial production, a single variety of polymers can no longer meet the practical needs. In the world, we have been able to provide more than 10 kinds of PC ABS alloys with a variety of performance characteristics to meet the needs of automobiles, electronic and electrical, office supplies and other fields. In the future, PC ABS alloy will further develop in the direction of high performance and functionalization, and its application field will continue to expand.
(2) At present, the flame retardant of PC ABS alloy materials has tended to be halogen-free.
Halogen-free flame retardants have become a hot spot in the research of countries around the world, and are the main trend in the development and application of flame retardants. At the same time, the development of flame retardants is developing in the direction of multi-functional, with the goal of improving flame retardant efficiency, reducing the amount used, and reducing the harm to health and the environment.
(3) Adapt to market demand, develop high-end PC ABS alloy products, and improve the added value of product technology.