Polystyrene Shape Molding Machine Polystyrene molding machine. Polystyrene refers to the polymer synthesized by the free radical addition polymerization of styrene monomer, the Japanese name for the Polyester. It is a colorless, transparent thermoplastic with a glass transition temperature above 100 ° C and is therefore often used to make disposable containers that require temperatures that require boiling water, as well as disposable foam boxes.
Polystyrene (PS) includes ordinary polystyrene, expanded polystyrene (EPS), high impact polystyrene (HIPS) and syndiotactic polystyrene (SPS). Ordinary polystyrene resin is non-toxic, odorless, colorless and transparent
Particles, glass-like brittle materials, its products have a high degree of transparency, light transmission rate of up to 90%, electrical insulation performance, easy to color, good processing fluidity, good rigidity and good resistance to chemical corrosion. Ordinary polystyrene is the lack of brittle, low impact strength, prone to stress cracking, poor heat resistance and intolerance to boiling water and so on.
Polystyrene Shape Molding Machine Ordinary polystyrene resin is an amorphous polymer, polystyrene macromolecule chain side of the benzene ring, large volume side of the benzene ring for the random arrangement determines the physical and chemical properties of polystyrene, such as high transparency High rigidity, high glass transition temperature, brittle and so on. Expandable polystyrene is made in the ordinary polystyrene impregnated with low boiling point of the physical blowing agent, the process of heating foam, dedicated to the production of foam products. High impact polystyrene is a copolymer of styrene and butadiene, butadiene is a dispersed phase, which improves the impact strength of the material, but the product is opaque. Syndiotactic polystyrene for the same structure, the use of metallocene catalyst production, the development of new varieties of polystyrene, good performance, belonging to engineering plastics
PS is usually a head-to-tail structure, the main chain is saturated carbon chain, pendant-based conjugated benzene ring, so that the molecular structure is irregular, increasing the rigidity of the molecule, so that PS non-crystalline linear polymer. Because of the presence of benzene ring, PS has a high Tg (80 ~ 105 ℃), so at room temperature is transparent and hard, due to the rigidity of the molecular chain, easy to cause stress cracking.
Polystyrene Shape Molding Machine Polystyrene colorless and transparent, free coloring, the relative density is second only to PP, PE, with excellent electrical properties, especially high-frequency characteristics, inferior to F-4, PPO. In addition, in the light stability after the methacrylic resin, but the anti-radiation ability is the strongest of all plastics. Polystyrene is the most important feature of the thermal stability and mobility when melting is very good, so easy to shape processing, especially injection molding easy, suitable for mass production. Molding shrinkage is small, the shape of the product size stability is also good.