Resin is the main raw material for manufacturing plastics. It is also used to make paints, adhesives, insulating materials, etc. Synthetic resins are widely used in the separation and purification of impurities in liquids in industrial production. There are macroporous adsorption resins, ion exchange resins, And some special resins.
Resin usually refers to the range of softening or melting after being heated. When softened, it has a tendency to flow under the action of external forces. At room temperature, it is solid, semi-solid, and sometimes it can be a liquid organic polymer.
The relative molecular weight is uncertain but usually higher. It is solid, medium-solid, pseudo-solid at room temperature, and sometimes it can be a liquid organic substance. It has a softening or melting temperature range, has a tendency to flow under the action of external forces, and often shows a shell shape when it breaks.
Broadly refers to a polymer or prepolymer used as a plastic substrate. Generally insoluble in water and soluble in organic solvents. According to the source, it can be divided into natural resin and synthetic resin; according to its different processing behavior, there are thermoplastic resin and thermosetting resin.
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1. By source
Resin is divided into natural resin and synthetic resin. Natural resin refers to the amorphous organic substances obtained from animal and plant secretions in nature, such as rosin, amber, shellac, etc.
Synthetic resin refers to resin products obtained by chemical synthesis of simple organic substances or chemical reactions of certain natural products, such as phenolic resin, polyvinyl chloride resin, etc., where synthetic resin is the main component of plastic.
2. According to the synthesis reaction
According to this method, the resin can be divided into addition polymer and condensation polymer. The addition polymer refers to a polymer prepared by addition polymerization, and the chemical formula of its link structure is the same as the molecular formula of the monomer, such as polyethylene, polystyrene, and polytetrafluoroethylene.
The polycondensate refers to a polymer made by condensation polymerization. The chemical formula of the structural unit is different from the molecular formula of the monomer, such as phenol resin, polyester resin, polyamide resin, etc.
3. According to the molecular main chain
According to this method, the resin can be divided into carbon chain polymers, heterochain polymers and elemental organic polymers.
Carbon chain polymer refers to a polymer whose main chain is entirely composed of carbon atoms, such as polyethylene and polystyrene.
Heterochain polymer refers to a polymer whose main chain is composed of atoms of two or more elements such as carbon and oxygen, nitrogen, sulfur, etc., such as polyoxymethylene, polyamide, polysulfone, polyether, etc.
Elemental organic polymer refers to the main chain does not necessarily contain carbon atoms, mainly composed of atoms of silicon, oxygen, aluminum, titanium, boron, sulfur, phosphorus and other elements, such as organic silicon.
4. By nature
Thermosetting resins (usually used in FRP): unsaturated polyester/vinyl ester/epoxy/phenolic/bismaleimide (BMI)/polyimide resin, etc.
Thermoplastic resin: polypropylene (PP)/polycarbonate (PC)/nylon (NYLON)/polyetheretherketone (PEEK)/polyethersulfone (PES), etc.