The earliest known resin was a fatty substance extracted from tree secretions, such as rosin.It wasn't until 1906, when the first synthetic phenolic resin was made, that the new era of synthetic resins began.In 1942 the American rubber company first produced unsaturated polyester resins and later called any unprocessed polymer a resin.But it has nothing to do with trees.
Resin is divided into thermoplastic resin and thermosetting resin two categories.For heating melting cooling become solid, and can be repeated in the fusible resin called thermoplastic resin, such as polyvinyl chloride resin (PVC), polyethylene resin (PE) and so on;Thermosetting resins, such as phenolic resins, epoxy resins, unsaturated polyester resins and so on, are called thermosetting resins when they are no longer reversible after being heated and solidified into solid that neither dissolves nor melts.
Polyester is a kind of macromolecule compound containing ester bond, which is distinguished from phenolic resin and epoxy resin.The polymer is formed by the condensation of dibasic acid with dibasic alcohol. When the polymer contains an unsaturated double bond, it is called an unsaturated polyester. The unsaturated polyester is dissolved in a polymerizable monomer (usually styrene).And become a kind of viscous liquid, referred to as the Unsaturated Polyester Resin (English name Unsaturated Polyester Resin UPR).
Unsaturated polyester resins can thus be defined as a viscous liquid consisting of a linear polymeric compound of saturated, or unsaturated, dibasic acid with saturated, or unsaturated, and dibasic alcohol condensed into a monomer (usually styrene).
QuanZhou Neweco High Polymer Material Co.,Ltd.
Neweco is one of the leading unsaturated polyester resin manufacturers and suppliers,widely used in automobiles, ships, rail transit, wind power generation, pipe cans, heat and corrosion protection, building materials, stone repair, sanitary ware, artificial stone and other industries. Suitable for hand lay-up, spray, pultrusion, winding, molding, vacuum introduction / RTM, casting and other molding processes. Neweco Resin is committed to excellence and focuses on the application of composite materials to provide customers with comprehensive solutions.