The plastics that we often use isn't a pure substance. It's made by the preparation of many supplies, in which the high polymer (or artificial resin) is its primary component. In addition, to be able to enhance the performance of plastics, a wide range of auxiliary materials should also be added within the polymer, similar to fillers, plasticizers, lubricants, stabilizers, coloring brokers, and so forth, in order to make the plastics have good performance.
First, synthetic resin Artificial resin is the main part of plastics. The final content material of synthetic resin in plastics is from forty% to a hundred%. Because of its giant content material, the character of synthetic resin usually determines the character of the plastics, so people often take resin as a synonym of plastics. In fact, resin and plastics are two totally different concepts. Resin is a uncooked polymer which has not been processed. While for many plastics, besides the resin as its major component, there are also another substances.
Second, fillers Fillers can improve the energy and warmth-resistant quality of the plastics, as well as lower the cost. For instance, adding wood flour into phenolic resin can tremendously reduce the cost, which makes the phenolic plastic as one of many most cost-effective plastics. On the similar time, it may possibly additionally significantly improve the mechanical strength. Fillers will be divided into natural filler and inorganic filler, with the previous as wood flour, rags, paper and every kind of textile fibers, and the latter as glass fibers, diatomaceous earth, asbestos, and carbon black.
Third, plasticizers Plasticizers can enhance the plasticity and suppleness of the plastics, reduce brittleness, and make the plastics straightforward to be processed and molded. Plasticizers are usually organic compounds with high boiling point, miscible with the resin, non-toxic, odorless, and stable to light and heat. The commonly used plasticizers embody phthalates, benzophenone, and so on.
Fourth, stabilizers With a purpose to forestall the decomposition and damage of artificial resin caused by light and warmth, and to extend its service life, it's necessary to add stabilizers in plastics. The commonly used stabilizers include stearate, epoxy resin and so on.
Fifth, coloring brokers Coloring brokers can provide the plastics with varied bright and delightful colors. Natural dyes and inorganic pigments are sometimes used as coloring agent.
In addition to the above additives, other additives may also be added in plastics, comparable to lubricants, flame retardants, blowing cross-linking agents, antistatic brokers, and so forth, in order to fulfill completely different operating requirements.