The resin formed by the polycondensation reaction of a divalent or polycarboxylic acid and a dibasic or polyhydric alcohol can be classified into a polyester resin and an unsaturated polyester.
The unsaturated polyester resin is generally a linear polymer obtained by polycondensation of an unsaturated dibasic acid, a saturated dibasic acid, and a diol, and contains both repeating unsaturated and double bonds and ester bonds in the resin molecule. Since the unsaturated polyester resin thus obtained is in a solid or semi-solid state, and does not crosslink well into a good-body structure product, it must be diluted with a crosslinking agent styrene to form a certain viscosity at the later stage of production. Resin solution. The unsaturated polyester resin actually used is such a resin solution, and a substance such as a curing agent is added in the use to cause a radical copolymerization reaction between the styrene unit and the double bond in the unsaturated polyester molecule, and finally the crosslinked chain becomes a bulk structure. Resin.
It can be seen that the unsaturated polyester resin is a thermosetting resin, and the reaction process for forming a bulk structure is: the first step is to form a linear molecule by a polycondensation reaction of a dibasic acid and a glycol; and the second step is in the curing process. The bulk structure is obtained by a free radical copolymerization reaction between the double bonds of the resin and the crosslinking agent. This different reaction stage is achieved by different functional groups and different reaction mechanisms, and is characterized by the synthesis and solidification of unsaturated polyester resins.
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.