Factors affecting the degree of resin curing
Unsaturated polyester resin curing is a linear macromolecule through the role of crosslinking agent, forming a three-dimensional network process, but the curing process can not consume all the active double bonds in the resin and achieve 100% curing degree.That is to say, resin curing degree is difficult to achieve complete.The reason is that at the later stage of curing reaction, the viscosity of the system increases sharply, which hinders the diffusion.Generally only according to the material properties tend to be stable, it is considered to be fully cured.
The curing degree of resin has great influence on the properties of FRP.The higher the degree of curing, the mechanical properties, physical and chemical properties of FRP products will be given full play.(some people have done experiments to test the physical properties of UPR resin at different stages after curing. The results show that the bending strength of UPR resin does not increase in a certain period with the increase of time, and it does not become stable until one year later.In fact, for the glass fiber reinforced plastic products have been put into use, a year later, due to heat, light and other aging and medium corrosion, mechanical properties and began to gradually decline.
The curing degree of polyester resin can be influenced by many factors, such as the composition of the resin itself, the amount of initiator and promoter, curing temperature, post-curing temperature and curing time.
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.