Commonly used plastic varieties performance and use | rigid vinyl film
1. Polyethylene: commonly used polyethylene can be divided into low-density polyethylene (LDPE), high-density polyethylene (HD
PE) and linear low density polyethylene (LLDPE). Among the three, HDPE has better thermal, electrical and mechanical properties, while LDPE and LLDPE have better flexibility, impact properties, film-forming properties, etc. LDPE and LLDPE are mainly used in packaging films, agricultural films, plastic modification, etc., while HDPE has a wide range of applications, such as films, pipes, and injection daily necessities.
2. Polypropylene: Relatively speaking, polypropylene has more varieties, more complex uses, and a wide range of fields. The varieties mainly include homopolypropylene (homopp), block copolymer polypropylene (copp) and random copolymer polypropylene (rapp) According to different uses, homopolymerization is mainly used in the fields of wire drawing, fiber, injection, BOPP film, etc. Copolymer polypropylene is mainly used in household appliances injection parts, modified raw materials, daily injection products, pipes, etc., and random polypropylene is mainly used Used for transparent products, high-performance products, high-performance pipes, etc.
3. Polyvinyl chloride: Because of its low cost and self-flame retardant properties, it has a wide range of uses in the construction field, especially for sewer pipes, plastic steel doors and windows, plates, and artificial leather.
4. Polystyrene: As a kind of transparent raw material, it has a wide range of uses when there is a need for transparency, such as automobile lampshades, daily transparent parts, transparent cups, cans, etc.
5. ABS: It is an engineering plastic with a wide range of uses, with outstanding physical mechanical and thermal properties. It is widely used in household appliances, panels, masks, assemblies, accessories, etc., especially household appliances, such as washing machines, air conditioners, refrigerators, electric fans, etc. , The amount is very large, in addition to the plastic modification, the use is also very wide.
Generally refers to plastics that can withstand a certain external force, have good mechanical properties, high and low temperature resistance, and have good dimensional stability, and can be used as engineering structures, such as polyamide and polysulfone. In engineering plastics, it is divided into two categories: general engineering plastics and special engineering plastics. Engineering plastics in mechanical
Engineering plastics (2 photos)
Performance, durability, corrosion resistance, heat resistance, etc. can meet higher requirements, and the processing is more convenient and can replace metal materials. Engineering plastics are widely used in electrical and electronic, automotive, construction, office equipment, machinery, aerospace and other industries. Substituting plastic for steel and plastic for wood has become an international trend.
General engineering plastics include: polyamide, polyoxymethylene, polycarbonate, modified polyphenylene ether, thermoplastic polyester, ultra-high molecular weight polyethylene, methylpentene polymer, vinyl alcohol copolymer, etc.
Special engineering plastics are divided into cross-linked and non-cross-linked types. Cross-linked types are: polyamino bismaleamide, polytriazine, cross-linked polyimide, heat-resistant epoxy resin and so on. Non-crosslinked types are: polysulfone, polyethersulfone, polyphenylene sulfide, polyimide, polyether ether ketone (PEEK) and so on.
Generally refers to plastics that have special functions and can be used in special applications such as aviation and aerospace. For example, fluoroplastics and silicones have outstanding high temperature resistance, self-lubricating and other special functions, and reinforced plastics and foamed plastics have special properties such as high strength and high cushioning. These plastics belong to the category of special plastics.
a. Reinforced plastic:
Reinforced plastic raw materials can be divided into granular (such as calcium plastic reinforced plastic), fiber (such as glass fiber or glass cloth reinforced plastic), and flake (such as mica reinforced plastic) in appearance. According to the material, it can be divided into cloth-based reinforced plastics (such as rag reinforced or asbestos reinforced plastics), inorganic mineral filled plastics (such as quartz or mica filled plastics), and fiber reinforced plastics (such as carbon fiber reinforced plastics).
Foam plastics can be divided into three types: rigid, semi-rigid and flexible foams. Rigid foam has no flexibility, and its compression hardness is very large. It will deform only when it reaches a certain stress value and cannot return to its original state after the stress is relieved. Flexible foam is flexible, with low compression hardness, and is easy to deform. Restore the original state, the residual deformation is small; the flexibility and other properties of the semi-rigid foam are between the rigid and soft foams.
rigid vinyl film