Resin usually refers to the softening or melting range after heating, softening when there is a tendency to flow under external force, at room temperature is a solid, semi-solid, and sometimes can be a liquid organic polymer. Broadly speaking, any polymer that can be used as raw material for plastic products is called resin. Resin has a natural resin and synthetic resin points. Natural resin refers to the nature of animal and plant secretions derived from amorphous organic substances, such as rosin, amber, shellac and so on. Synthetic resin refers to a resin product obtained by chemical synthesis of simple organic compounds or by chemical reaction of some natural products. Natural resins can be classified according to the resin components, the history of resin formation. In accordance with the basic components of the resin can be divided into three categories: ① pure resin, which consists of terpenoids and crude essential oil resin-like substances. Generally insoluble in water, but soluble in organic solvents, such as rosin and so on. ② containing gum resin or gum resin, is composed of polysaccharides, soluble in water or water swelling, but not soluble in alcohol and organic solvents, such as frankincense and so on. ③ oleoresin or gums, refers to contain more essential oils, soluble in oil resin. According to the history of the formation of resin can be divided into fossil resin, semi-fossil resin and fresh resin. The latter is the most important natural resin source. Some of the natural resin from the earliest shipping port named after the name, such as Ma resin, Copal resin.
Synthetic resin is a viscous liquid or heated to soften the solid, usually have a melting or softening temperature range, under the action of external force can be plastic flow state, and some properties similar to natural resin. The most important application of synthetic resin is to make plastic. To facilitate processing and improve performance, often add additives, and sometimes used directly for processing, it is often synonymous with plastic. Synthetic resin or synthetic fiber, paint, adhesives, insulation materials, and other basic raw materials. A wide range of synthetic resins. According to the main chain structure of carbon chain, heterochain and non-carbon chain synthetic resin; according to the characteristics of the synthesis reaction polyaddition and polycondensation synthetic resin. Practical applications, often according to their thermal behavior is divided into thermoplastic resin and thermosetting resin. Synthetic resin production of rich sources of raw materials, early coal tar products and calcium carbide acetylene mainly oil and gas products are mostly dominated, such as ethylene, propylene, benzene, formaldehyde and urea. Synthetic resin production methods using bulk polymerization, suspension polymerization, emulsion polymerization, solution polymerization, melt polymerization and interfacial polycondensation.
Plastics (Plastics): The plastic behavior of the material, the so-called plastic refers to the role of external forces, deformation occurs, the external force is removed, the state can still maintain the force. Plastic modulus of elasticity between the rubber and fiber, the force can take some deformation. Soft plastic is close to the rubber, hard plastic is close to the fiber.
Plastic refers to the resin (or monomer in the process of direct polymerization) as the main ingredient to plasticizers, fillers, lubricants, colorants and other additives as an auxiliary component in the process of flow molding material. Plastic for the synthesis of polymer compounds, free to change the body style. Plastic is the use of monomer materials to synthesis or condensation reaction polymerization of materials, from synthetic resins and fillers, plasticizers, stabilizers, lubricants, pigments and other additives, and its main component is a synthetic resin.
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