Plastic is a high-molecular organic material made of na […]
Plastic is a high-molecular organic material made of natural or synthetic resin as the main component, with fillers, plasticizers, stabilizers, lubricants, pigments and other additives appropriately added, and molded under certain temperature and pressure. Resin refers to an organic polymer that usually has a conversion or melting range when heated, is fluidized by external force during conversion, and is solid or semi-solid or liquid at room temperature.
(1) Synthetic resin It is a synthetic polymer compound. It is the most basic part of plastics. It plays an adhesive role and determines whether the heating property of the plastic is thermoset or thermoplastic. This component affects the main properties of the plastic. Some plastics are named after synthetic resins, such as epoxy resins.
(2) Filler It is some powdery or fibrous materials that are relatively inert in plastic formulations. The purpose of adding fillers is to reduce costs while improving the mechanical properties, heat resistance and electrical properties of the plastic. Usually the filler is added in 40%~70%, divided into inorganic and organic fillers. Inorganic fillers include clay, talcum powder, asbestos, etc., and organic fillers include wood flour, paper, rags, etc.
(3) Plasticizer Its role is to improve the fluidity and flexibility of plastics, reduce their rigidity and brittleness, and make plastics easy to process and shape. The plasticizer must be well miscible with the resin, low volatility, non-toxic, stable to light and heat, and non-flammable.
(4) Stabilizer The role of the stabilizer is to prevent deterioration and decomposition of the plastic due to heat, oxygen and light during processing and use, so as to extend the service life of the plastic. The types of stabilizers include antioxidants, ultraviolet absorbers and heat stabilizers. The stabilizer should not decompose during the plastic molding process, is resistant to water, oil, and chemical corrosion, and is easily miscible with resin.
(5) Coloring agent Its function is to make the plastic have a certain color. Colorants are also divided into inorganic pigments and organic pigments. Inorganic pigments are stable, but opaque and poor dyeing power; transparent plastics need to be matched with organic dyes to make their colors bright.
(6) Curing agent In order to obtain thermosetting plastics, a curing agent must be added.
(7) Lubricant's role is to prevent plastic from sticking to metal equipment or molds during the molding process, causing difficulty in demolding. Lubricants can also make the surface of plastic products bright and beautiful. Commonly used lubricants are stearic acid and its barium, calcium, and the amount is 0.5% to 1.5% of the plastic.
(8) Other additives. Some plastic products generate static electricity due to friction during use, which poses a certain safety hazard. At the same time, it is easy to absorb dust. At this time, an antistatic agent is required. This article also includes flame retardants, foaming agents, fluorescent agents, etc.
The above is the introduction of the material composition of plastic furniture