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What types of plastic ?

Release time: 2020-08-10 10:46:31  Hits: 69

Classification of plastics:


1. According to the different properties of the plastic after being heated, it is divided into thermoplastic plastics and thermosetting plastics.


The molecular structure of thermoplastics is a linear structure, which softens or melts when heated, can be molded into a certain shape, and becomes hard after cooling. It softens again after being heated to a certain extent, and then hardens after cooling. This process can be repeated many times. Such as polyvinyl chloride, polyethylene, polystyrene, etc. The molding process of thermoplastics is relatively simple, can be produced continuously, and has relatively high mechanical strength, so it develops rapidly.


The molecular structure of thermosetting plastics is a body structure, which also softens when heated, and can be molded into a certain shape, but after heating to a certain degree or adding a small amount of curing agent, it will be hardened and set, and it will not become soft or change after heating. Shape. After thermosetting plastics are processed and formed, they will no longer be softened by heat, so they cannot be recycled and reused. For example, phenolic plastics, amino plastics, and epoxy resins are all such plastics. The molding process of thermosetting plastics is more complicated, so continuous production has certain difficulties, but its heat resistance is good, it is not easy to deform, and the price is relatively low.


2. According to different uses of plastics, it is divided into general plastics and engineering plastics


General-purpose plastics refer to plastics with large yields, low prices, and a wide range of applications. They mainly include five varieties of polyolefin, polyvinyl chloride, polystyrene, phenolic plastic and amino plastic. Many products used in people's daily life are made of these general-purpose plastics.


Engineering plastics are plastics that can be used as engineering structural materials and replacing metal manufacturing machine parts. For example, polyamide, polycarbonate, polyoxymethylene, ABS resin, polytetrafluoroethylene, polyester, polysulfone, polyimide, etc. Engineering plastics have the characteristics of low density, high chemical stability, good mechanical properties, superior electrical insulation, and easy processing and molding. They are widely used in industries such as automobiles, electrical appliances, chemicals, machinery, instruments, and meters, as well as in space navigation and rockets. , Missiles and other aspects.



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