Resins are made from natural resins and synthetic resins. Natural resins are amorphous organic substances, such as rosin, amber and shellac, obtained from the secretions of plants and animals in nature. Synthetic resin is to point to by some simple organic compounds by chemical synthesis or natural products by the reaction of a chemical resin products, such as phenolic resin, PVC resin, etc., the plastic is the main component of synthetic resin.
According to this method, the resin can be divided into addition polymer and condensation polymer. A polymer is a polymer produced by addition polymerization. The chemical formula of its chain structure is the same as that of a monomer, such as polyethylene, polystyrene and polytetrafluoroethylene.
Polycondensation is a kind of polymer produced by condensation polymerization. The chemical formula of its structural unit is different from that of the monomer, such as phenolic resin, polyester resin and polyamide resin.
双环树脂（Double loop resin）
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