Resin can be divided into natural resin and synthetic resin. Natural resin refers to the amorphous organic substances obtained from the secretions of animals and plants in nature, such as rosin, amber, shellac, etc. Synthetic resin refers to the resin products obtained by chemical synthesis of simple organic substances or chemical reaction of some natural products, such as phenolic resin and polyvinyl chloride resin. Synthetic resin is the main component of plastics.
Polyketone resin can be divided into adduct and polycondensate according to the synthetic reaction. Adduct refers to the polymer prepared by addition polymerization. The chemical formula of its chain link structure is the same as that of monomer, such as polyethylene, polystyrene, polytetrafluoroethylene, etc. Polycondensation refers to the polymer prepared by condensation polymerization. The chemical formula of its structural unit is different from the molecular formula of monomer, such as phenolic resin, polyester resin, polyamide resin, etc. According to the composition of molecular main chain, the resin can be divided into carbon chain polymer, heterochain polymer and elemental organic polymer.
Carbon chain polymer refers to the polymer whose main chain is composed of carbon atoms, such as polyethylene, polystyrene and so on. Heterochain polymer refers to a polymer whose main chain is composed of carbon and atoms of more than two elements such as oxygen, nitrogen and sulfur, such as polyformaldehyde, polyamide, polysulfone, polyether, etc. Elemental organic polymer refers to the main chain that does not necessarily contain carbon atoms, which is mainly composed of atoms of silicon, oxygen, aluminum, titanium, boron, sulfur, phosphorus and other elements, such as silicone.
Thermosetting resin (generally used for FRP): unsaturated polyester / vinyl ester / epoxy / phenolic / bismaleimide (BMI) / polyimide resin, etc. Thermoplastic resin: polypropylene (PP) / polycarbonate (PC) / nylon / PEEK / PES, etc.