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The application of polyvinyl chloride (PVC) and polystyrene

by:CSSSLD     2021-02-03
PS is hard plastic, and mechanical strength is closely related to its molecular weight, the tensile strength for 30 - commonly 60 mpa, have high rigidity and surface hardness. Moisture absorption is very small, salt, alkali and non oxidizing acid corrosion. PS good corrosion resistance, is one of the most corrosion resistant polymer injection tooling. PS have high volume resistivity, good arc resistance, the power factor of close to zero, is ideal for high frequency insulation. PS has good coloring, dyeing and processability.

because of cheap, can replace flame retardant ABS. Using ptfe powder mixing with PVC, improve the wear resistance, is a low cost substitute for engineering plastics. PVC soft products mainly to develop in the direction of non-toxic, no plasticizer, solve the problems of the migration of plasticizer, prolong the service life of soft products, at the same time develop new USES in the areas of medical. Rigid PVC products can be used as structural materials, various building materials, such as pipes, profiles, plates, etc. , is the main application field for hard PVC.

the relative molecular mass - in 400000 700000 of new product development of ultra-high molecular weight of PS is PS, with excellent rigidity and impact resistance performance, is a kind of high intensity of PS resin. Common use PS, for the most part is transparent PS random type, relative molecular mass is 200000 - 300000, an individual can be up to 400000. Ordinary PS is amorphous plastic, with good gloss and transparency, light transmittance can be in 88% 92%.

because PVC anti-corrosion performance is good, in the chemical industry, environmental protection, petroleum and other departments have a wide range of applications. PVC is a crystallization of amorphous polymers, has the good transparency. If you pay attention to the selection and use of various additives, can be processed into transparency, good products, used in the decoration materials, food packaging products, edible oil bottle. Soft PVC used as a more consumer goods, and now to the development of medical materials. In terms of cars, ships and other vehicles, soft PVC as sealing materials, decoration materials, are also relatively large.

good electrical insulation in PVC cable industry not only have a large number of applications, can also act as the insulation of the electric tool handles and other insulating materials used, especially for PVC and ABS and SMA alloy can be used for computer accessories, household appliances, electric tools, instrument shell, computer parts, electronic accessories business machine, etc. Polystyrene PS for short, is one of the earliest industrialization production of resin. In general plastic, production after polyolefin and polyvinyl chloride (PVC).

in the improvement of PVC impact toughness at the same time, often also can be in injection molding processability, oil resistance, abrasion resistance, gloss appearance improvement in many aspects, such as, is depends on the amount of the characteristics of the polymer and mixing. In recent years the development of some new PVC alloy, such as PVC/AAS alloy, PVC/SMA alloy. The former is characteristic of has excellent weather resistance, which can effectively improve PVC heat resistance, excellent toughness concurrently at the same time.

polystyrene is the homopolymer of styrene. According to the molecular conformation, PS isotactic PS, gauge between PS and random PS three basic configurations. PS of isotactic PS is crystalline. Translucent or opaque, when temperature is below 80 ℃, its mechanical properties similar to normal random PS, but crystalline PS softening temperature is higher. Gauge between PS is crystalline, with metallocene catalyst production rules between PS has excellent electrical properties, chemical resistance and heat resistance, can replace part of the engineering plastics, such as PA, PBT, PET, etc.

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