polystyrene
DATE：2022/6/6 9:17:49 / READ： / SOURCE：This station
polystyrene
Polystyrene (PS) has good transparency, water resistance, light resistance and chemical resistance, and is mostly used in fields with transparency requirements.1. polystyrene structure polystyrene
Polystyrene (PS) has good transparency, water resistance, light resistance and chemical resistance, and is mostly used in fields with transparency requirements.
1. polystyrene structure polystyrene is a polymer formed by polymerization with styrene as monomer. Styrene monomer is prepared by catalytic dehydrogenation or oxidative dehydrogenation of ethylbenzene. EVA film production line www.handern com
2. there are three methods in styrene polymerization industry, namely bulk polymerization, suspension polymerization and lotion polymerization. Bulk method and suspension method are mainly used for mass production of general polystyrene.
Due to the large steric hindrance of benzene ring, the rotation within the molecule is limited, the molecular chain is not flexible and rigid, so it is brittle in macro view, and the glass transition temperature is 80~100 ℃. Polystyrene is an amorphous polymer, which is difficult to crystallize because its molecules are not easy to accumulate closely. If no additives affecting transparency are added, the general products will be transparent products. Due to the presence of benzene ring, polystyrene is easy to sulfonate and nitration, so it is easy to dye and can be made into brightly colored plastic products.
3. polystyrene performance EVA adhesive film production line www.handern com
Polystyrene is a colorless and transparent powder or granular thermoplastic resin. When the product falls to the ground or is knocked, it has a metallic crisp sound. The density is 1040~1050kg/m3, with low moisture absorption. Black smoke when burning.
4. the thermal deformation temperature of polystyrene is 70~98 ℃, the continuous service temperature of the product is 60~80 ℃, the heat resistance is poor, generally not more than 80 ℃, and the molding shrinkage is 0.4%~0.7%. Because the molecular chain is not flexible, it is easy to generate internal stress (internal stress refers to a force formed by the forced high elastic deformation of the polymer chain during the plastic molding process). The products annealed at 5 ℃ below the thermal deformation temperature can reduce the internal stress, improve the mechanical strength and increase the thermal deformation temperature. The polystyrene has small thermal conductivity and can be used as heat insulation and heat preservation materials, especially in the production of foamed plastic products. EVA film production line www.handern com
Polystyrene can be dissolved in benzene, toluene, carbon tetrachloride, chloroform, ketones, esters and some oils. Long term contact with acid, alcohol and oil will cause cracks and cracks. It can resist the corrosion of some mineral oils, organic acids, alkalis and salts.
Polystyrene has excellent electrical properties and is less affected by temperature and humidity. It is a good high-frequency insulating material.
Ordinary polystyrene plastic products show certain rigidity, products show certain brittleness and low impact strength.
The light transmittance of polystyrene is 88%~92%, which is second only to plexiglass. The refractive index is 1.59~1.60. However, turbidity or yellowing may occur when exposed to light or stored for a long time.
5. polystyrene has good fluidity and good formability. Various molding methods of thermoplastic can be used, and a large number of them are also used in the production of foamed plastics. EVA film production line www.handern com
Polystyrene is low in price, easy to process, with high rigidity, good surface gloss, good transparency, easy coloring and excellent electrical properties. It is widely used as industrial products and daily necessities, such as packaging materials and various containers.
3. polystyrene foam
Because of its low thermal conductivity, polystyrene foam can be widely used as heat insulation material, shockproof liner for various instruments and food, and can also be made into composite sheets with paper, textiles, plastics and metals. Polystyrene foams are mostly foamed with physical foaming agents. The foams are widely used as insulation materials and cushioning and shockproof packaging materials for trains, ships, buildings, refrigerators, refrigerators, etc. EVA film production line www.handern com
Author：admin