What kind of good plastics are usually used?

The plastic we usually use is not a pure substance, it is made up of many materials. Among them, high molecular polymers (or synthetic resins) are the main components of plastics. In addition, in order to improve the performance of plastics, various auxiliary materials, such as fillers, plasticizers, lubricants, stabilizers, Colorants, etc., can become plastics with good performance 1. Synthetic resin Synthetic resin is the most important component of plastics, and its content in plastics is generally 40% to 100%. Due to the large content and the nature of the resin often determines the nature of the plastic, people often regard the resin as a synonym for plastic. For example, confuse polyvinyl chloride resin with polyvinyl chloride plastics, and phenolic resins with phenolic plastics. In fact, resin and plastic are two different concepts. Resin is an unprocessed raw polymer that is not only used to make plastics, but also a raw material for coatings, adhesives, and synthetic fibers. In addition to a very small part of plastics containing 100% resin, most plastics need to add other substances in addition to the main component resin. 2. Filler Filler is also called filler, which can improve the strength and heat resistance of the plastic. , And reduce costs. For example, the addition of wood powder to the phenolic resin can greatly reduce the cost, making the phenolic plastic one of the cheapest plastics, while also significantly improving the mechanical strength. Fillers can be divided into two types: organic fillers and inorganic fillers, the former such as wood flour, rags, paper and various fabric fibers, and the latter such as glass fiber, diatomaceous earth, asbestos, carbon black, etc. 3. Plasticizer plasticizing The agent can increase the plasticity and flexibility of the plastic, reduce the brittleness, and make the plastic easy to process and shape. Plasticizers are generally high-boiling organic compounds that are miscible with resin, non-toxic, odorless, and stable to light and heat. The most commonly used are phthalate esters. For example, in the production of polyvinyl chloride plastics, if more plasticizers are added, soft polyvinyl chloride plastics can be obtained; if no or less plasticizers are added (amount u003c10%), rigid polyvinyl chloride plastics can be obtained 4. Stabilizer In order to prevent the synthetic resin from being decomposed and damaged by light and heat during processing and use, and to extend the service life, a stabilizer should be added to the plastic. Commonly used are stearate, epoxy resin, etc. '5Commonly used organic dyes and inorganic pigments as colorants.　　6, lubricant　　The role of lubricant is to prevent the plastic from sticking to the metal mold during molding, and at the same time make the surface of the plastic smooth and beautiful. Commonly used lubricants include stearic acid and its calcium and magnesium salts. 7. Antioxidants prevent plastics from being heated and oxidized during heating molding or high-temperature use, which will cause plastics to turn yellow and crack. In addition to the above additives, plastics Flame retardants, foaming agents, antistatic agents, etc. can also be added to meet different requirements. Label: pe waterproof bag