Plastic. Where did it originally come from? That is to say, what is plastic made of?

Plastics are macromolecules polymerized by addition polymerization or polycondensation of monomers. Their deformation resistance is between fiber and rubber, and they are made of synthetic resin and additives such as fillers, plasticizers, stabilizers, lubricants and pigments.

The main component of plastic is resin. Resin refers to a polymer compound without various additives. The word resin was originally named after the lipids secreted by animals and plants, such as rosin and shellac. Resin accounts for about 40%- 100% of the total weight of plastics.

The basic properties of plastics mainly depend on the properties of resin, but additives also play an important role. Some plastics are basically composed of synthetic resin with little or no additives, such as plexiglass and polystyrene.

Extended data

Advantages of plastics

Light specific gravity The specific gravity of plastics is generally between 0.9 and 2.3. Compared with metal, its surname is only half that of aluminum, one fifth that of steel and one eighth that of lead. If it is a porous foam, its specific gravity is much lighter.

The characteristics of light specific gravity are closely related to the performance and use of products. Plastic products made of light specific gravity are light and beautiful, which are not only convenient to use and carry, but also convenient to transport and keep, and are suitable for daily use of plastic products.

Good chemical stability. Generally speaking, plastics have excellent chemical stability and do not react with acids, salts, solvents, steam, waste gas, etc. It is suitable for manufacturing various industrial, agricultural and civil plastic products. For example, polyethylene films have been widely used as packaging bags for various foods and medicines. Polyvinyl chloride film has been widely used as packaging container for chemical fertilizer.

Good electrical insulation. Another characteristic of plastics is its excellent electrical insulation, and it is an indispensable material for electrical and electronic industries. Some plastics also have good high-frequency resistance and can be used in radio communication, television, radar and other equipment.

While bakelite and electric jade plastics, which are common in daily-use plastics, are mostly used in daily-use appliances, such as light plugs, switches, hair dryers, electric knife handles, etc.

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