Explanation
It refers to a kind of materials in which crosslinking curing reaction is generated between polymer molecular chains after heating to become insoluble. The resin is generally a solid or viscous liquid with low molecular weight before assimilation; It can bating or flow during the molding process, has plasticity, and can be made into products of certain shape. At the same time of molding, chemical reaction occurs and crosslinking curing occurs. Make its molecular structure a three-dimensional network structure; Once curing. It is also impossible to re bating or flow by reheating and pressurizing. Multi use polycondensation method for production. Common thermosetting resin include phenolic resin, urea formaldehyde resin, melamine formaldehyde resin, epoxy resin, unsaturated polyester, polyurethime, polyimide, etc. thermosetting resin has large rigidity, high hardness, high temperature resistance, non flammability, good dimensional stability, but poor brittleness and mechanical properties due to its body structure. thermosetting resin is mainly used to manufacture reinforced plastics, foamed plastics, various electrical molding plastics, casting products, etc., as well as a considerable amount of adhesive and coatings.
Classification
Organic polymer materials -> Plastics