How many kinds of plastic raw materials are there? How to distinguish them?
According to the nature of the plastic after heating, it is divided into thermoplastic and thermosetting plasticsThermoplastic molecular structures are linear structure, softening or melting when heated, plastic into certain shape, after cooling and hardening. When heated to a certain extent to soften after cooling and harden, this process can be repeated several times. Such as polyvinyl chloride, polyethylene, polystyrene and other thermoplastic. Plastic molding process is relatively simple, can continuous production, and has very high mechanical strength, so it is developing very quickly.The molecular structure of thermosetting plastics is the body structure, softening also occurs in heated, can plastic into a certain shape, but is heated to a certain extent or amount of curing agent, hardened stereotypes, re heating become soft and will not change shape. The thermosetting plastic processing molding after heating no softening, and therefore can not be recovered then, such as phenolic, amino plastics, resin and other plastic. These are thermosetting plastic molding process is more complex, so the continuous production is difficult, but its good heat resistance, not easy to deformation, and the price is relatively low.
Plastic with its superior performance gradually replaced many has been used for decades, hundreds of years of materials and utensils, becoming an indispensable assistant. Plastic and metal in hard wood, light transparent glass ceramic, corrosion resistance, rubber elasticity and toughness in a body. Therefore, in addition to daily necessities, plastic more widely used in aerospace, medical equipment, petroleum chemical industry, machinery manufacturing, defense, construction and other industries.
Classification, composition and characteristics of plasticsPlastic is a synthetic polymer material widely used, in our daily life. From the plastic products meet the eye everywhere after we get up to use the toilet articles, the breakfast dishes, to work with the rest of the stationery, with cushions, mattresses, and TV, washing machine, computer shell, and the night bring us all the other light lamps......
