What are the distinguishing features of plastics? What is their chemical name?
According to the different use characteristics of various plastics, plastics are usually divided into three types: general plastics, engineering plastics and special plastics.
Generally refers to large output, wide use, good formability, cheap plastic. There are five kinds of general plastics, namely polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS) and acrylonitrile butadiene styrene copolymer (ABS). These five kinds of plastics accounted for the vast majority of plastic raw materials used, the basic can be classified as special plastic varieties, such as: PPS, PPO, PA, PC, POM and so on, they are in daily life in the small amount of the product, mainly used in the field of engineering, National defense science and technology industry and other high-end, such as automotive, aerospace, architecture, communications and other fields. Plastics are classified into thermoplastic and thermosetting plastics according to their plasticity. Usually, thermoplastic plastic products can be recycled, and thermosetting plastics are not, according to the optical properties of plastics to points, can be divided into transparent, translucent and opaque materials, such as PS, PMMA, AS and PC belong to the transparent plastic, and most other plastics are made of opaque plastic.
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 and film forming properties. LDPE and LLDPE are mainly used for packaging film, agricultural film, plastic modification, etc., and HDPE is widely used in many fields, such as film, pipe, injection, daily necessities and so on.
