Plastic is a common material in life. Plastic products are made of different materials, with different materials and different applications. According to the different use characteristics of plastics, plastics are usually divided into the following three categories: general plastics, engineering plastics and special plastics.
General plastics material generally refer to plastics with large output, wide application, good formability and low price. Important general plastics material are polyethylene, polypropylene, polyvinyl chloride, polystyrene and other varieties.
General plastics material is easy to form and has a high degree of design freedom; its specific strength is greater than that of metal; its electrical insulation is good. Its specific characteristic and uses is as follows:
Characteristics: Polyethylene is an opaque or translucent, light-weight crystalline plastic with excellent low temperature resistance (minimum operating temperature can reach -70 ~ -100℃), electrical insulation, good chemical stability, and resistance to most acids Alkali attack.
Uses: High pressure polyethylene is used for film products, pipes, injection molding products, wire wrapping layers, etc. Medium and low pressure polyethylene is mainly used for injection molding products and hollow products. Ultra-high pressure polyethylene can be used as engineering plastics.
Characteristics: Polypropylene is a thermoplastic polymerized from propylene, usually colorless, translucent solid, odorless and non-toxic, with a density of 0.90 ~ 0.919 g/cm3. It is the lightest general-purpose plastic. Its outstanding advantages are that it has Resistant to cooking and corrosion in water.
Uses: Polypropylene can be made into furniture, tableware, kitchen utensils; it can be made into various agricultural tools, many parts of automobiles, flat silk woven into woven bags, made into packing belts, and can also be used to produce various films for heavy packaging bags Wait.
Characteristics: PVC is a plastic polymerized from vinyl chloride, and its hardness can be greatly changed by adding plasticizers. Its hard products and even soft products have a wide range of uses.
Uses: PVC doors and windows, upper and lower water pipes, food packaging; PVC can be used for artificial leather, foam products; mainly used for wire and cable sheathing materials.
Characteristics: Polystyrene can be divided into general-purpose polystyrene (GPPS), high-impact polystyrene (HIPS), and expandable polystyrene (EPS)
Uses: GPPS is mainly used in daily necessities, stationery, lamps, indoor and outdoor decorations, cosmetic containers, fruit trays, instrument shells, and food packaging. HIPS is mainly used for packaging materials, but also for household appliances. EPS can be further processed into foam, mainly used in packaging materials and construction fields.
Characteristics: Aminoplasts are plastics obtained by polycondensation of raw materials with amino functional groups and aldehydes. Mainly include urea-formaldehyde, melamine-formaldehyde, aniline-formaldehyde and resins such as urea and melamine and formaldehyde copolycondensation.
Uses: Amino resin can be made into plastic powder, reinforced plastic for compression molding, injection molding, transfer molding, and can also be made into laminated plastic. These products can be widely used in electrical parts, daily necessities and tableware.
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