Resin definition and classification

First, the definition of resin Resin usually refers to the softening or melting range after heating, softening tends to flow under the action of external forces, 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 a raw material for processing plastic products is called a resin.

Resin is divided into natural resin and synthetic resin. Natural resins refer to amorphous organic substances derived from animal and plant secretions in nature, such as rosin, amber, shellac, and the like. Synthetic resin refers to a resin product obtained by chemical synthesis of a simple organic substance or a chemical reaction of certain natural products.

First, the resin classification Resin classification methods, in addition to the resin source can be divided into natural resins and synthetic resins, but also according to the composition of the synthesis reaction and the main chain to be classified.

1. According to the classification of resin synthesis reaction According to this method, the resin can be divided into addition polymer and polycondensate. Addition polymer refers to a polymer obtained by addition polymerization reaction. The chemical structure of the chain segment structure is the same as that of the monomer, such as polyethylene, polystyrene, polytetrafluoroethylene, and the like.

The polycondensate refers to a polymer obtained by a condensation polymerization reaction. The chemical formula of the structural unit is different from the molecular formula of the monomer, such as a phenolic resin, a polyester resin, a polyamide resin, and the like.

2, according to the resin composition of the main chain composition According to this method, the resin can be divided into carbon chain polymer, hetero-chain polymer and elemental organic polymer.

The carbon chain polymer refers to a polymer in which the main chain is entirely composed of carbon atoms, such as polyethylene, polystyrene, and the like.

Heterochain polymer refers to a polymer in which the main chain is composed of carbon and oxygen, nitrogen, *, and other two or more elemental atoms, such as polyoxymethylene, polyamide, polysulfone, polyether, and the like.

An organic polymer means that the main chain does not necessarily contain carbon atoms and is mainly composed of atoms such as silicon, oxygen, aluminum, titanium, boron, phosphorus, and phosphorus, such as organic silicon.