Plastic is a monomer as raw material, through the addition polymerization and polycondensation reaction of polymerization of polymer compounds (macromolecules), commonly known as plastic (plastics) or resin (resin), free to change the style, composition and form consists of synthetic resin and packing, plasticizer, stabilizer, lubricant, ink additive composition and so on. pinyin Su liao wubi ubou English Plastics. Plastic material; plastomer The main component of plastics is resin. The term "resin" is originally made from the lipid produced by plants and animals, such as rosin, shellac, etc. Resin is a high polymer that has not been mixed with various additives. Resins account for 40% ~ 100% of the total weight of plastic. The basic properties of plastics are mainly determined by the nature of resin, but additives also play an important role. Some plastics are basically made of synthetic resins, without or without additives such as organic glass and polystyrene. Plastic, in fact, is one of the synthetic resins that are similar in shape to the resin in natural resin, but are chemically synthesized and called plastic. define According to the American institute of materials testing. Plastic is a kind of material with high molecular weight organic material. It presents solid shape during processing, and can be shaped by flow in manufacturing and processing. Therefore, the following items can be obtained from the following: It is a high polymer organic compound. It can exist in various types such as liquid solid colloidal solution. It can be shaped (moldable). There are many kinds of plastics, because different monomers and their compositions can make different plastics. Wide range of products are diversified. There are different properties. Different processing methods can be used. Plastics and resins are also used in combination. classification Plastic can be distinguished between thermosetting and thermoplastic type ii. The former cannot be reshaped and used, and the latter can be repeatedly produced. There are two basic types of plastic polymer structure. The second is the linear structure. Molecular structure classification of macromolecule: granule (a) linear structure (b) linear structure (with branched chain) (c) reticular structure (small amount of crosslinking between molecular chains) (d) body structure (mass cross-linking between molecular chains) Two different structures, dissolved; Because there are no independent large molecules, there is no elasticity and plasticity, which cannot dissolve and melt. Table 1.1 is the comparison table of plastics raw materials, 1 to 8 are generalized plastic, and 9 th. Ten things are somewhere in between. Generally speaking, PP, HDPE, LDPE, PVC and PS are the five main plastics.
