What are the characteristics of electrical plastics? What are the categories?
Classification is the most widely used and relatively scientific method of classification according to the characteristics of resins when heated and cooled.
Classification by use of plastics1) this kind of general plastic plastic is a kind of widely used plastic, its output, accounting for about 3/4 of the total output of plastic, low price, widely used to make daily necessities less force, such as TV shell, telephone casings, plastic pots, plastic barrels etc.. Closely related with people, it has become an important pillar of the plastics industry. Commonly used general plastics are PE, PVC, PS, PP, PF, UF, MF and so on.2) universal plastics price is low, but its mechanical properties, high temperature resistance, this candle performance can not meet the needs of certain engineering and equipment used as structural materials, engineering plastics came into being, it has high mechanical strength, high rigidity, can replace some iron and steel or nonferrous metal materials, machinery manufacturing the complex structure of the parts or engineering stress, many use effect is more than the original material. Commonly used engineering plastics are PA, ABS, PSF, PTFE, POM, PC and so on.3) this kind of special plastic plastic has some unique features, can be used in some special occasions, such as magnetic plastics, plastics, plastics, photosensitive plasma pearlescent plastic, medical plastic etc..
Thermosetting plastics, such as plastics, are softened at the first heat, cooled, cured and hardened. Re heating will no longer soften and will decompose when the temperature rises to a certain value. This is because in the plastic forming process of plastic chemical changes, linear molecules into molecular shape, resin into both softening and dissolving, no change in shape, no longer has plasticity, it is usually hard and brittle. Commonly used thermosetting plastics are PF, UF, MF, EP, UP and so on.
This kind of thermoplastic plastics soften when heated, the temperature rises to a certain degree in the molten state, a viscous fluid can flow by means of pressure and mold products, can be made in a certain shape, after cooling can keep the molded shape. Again, the variable soft heating and melting, re plastic molding. In the process of heating and cooling, it has only physical change without chemical change. There are many kinds of plastics, such as PE, PVC, PA, PS, PMMA, ABS, PC, PP and so on.
