Vinyl resin is made by the reaction of epoxy resin and unsaturated acid, so that it has mechanical properties similar to epoxy resin, but also has the technological characteristics of unsaturated resin. The molecular chain ends have double bonds with high crosslinking degree and high reactivity, and the chemical properties are stable. Among them, the stable phenyl ether bond makes the vinyl ester resin have good corrosion resistance. In addition, the ester group is only located at the end of the molecular chain, and the cross-linking is only carried out at the end during the curing reaction. The entire molecular chain does not participate in the reaction. Therefore, the molecular chain can be stretched and exhibit good toughness, and the elongation can reach 4%～8%. At the same time, the hydroxyl group in the vinyl ester molecule increases the resin's wettability to the glass fiber. The lower viscosity makes the resin suitable for most FRP processes.
Standard bisphenol A epoxy vinyl ester resin is synthesized by the reaction of methacrylic acid and bisphenol A epoxy resin, etc., and has been dissolved in styrene solution. The resin has the following characteristics:
1》 High strength;
2》 Good toughness, elongation and fatigue resistance;
3》 Good heat resistance;
4》 The molecular structure of the resin shows that, compared with ordinary vinyl ester resins (such as fumaric acid modified vinyl ester resins), the resin has improved glass fiber wettability and improved adhesion, and can also withstand higher The chemical group impacted by external force has excellent manufacturability;
Because of its unique mechanical strength and stiffness, heat cycle resistance and corrosion resistance, epoxy vinyl ester resin can better meet the requirements of high-quality FRP products. However, the curing shrinkage of this type of resin is still relatively large, and it cannot meet the requirements of some products with high dimensional accuracy. This is particularly important in the automotive industry. However, the technical problem of how to control the curing shrinkage of resin has been plagued by FRP engineers, and no substantial progress has been made. More FRP engineers have used experience to formulate shrinkage margins and control shrinkage when designing and manufacturing FRP products and molds; Or through the addition of fillers, low shrinkage additives to control shrinkage, to ensure the dimensional accuracy of the product, but the actual effect is not obvious, or affect other properties. The successful development and application of the ultra-low shrinkage vinyl ester resin pioneered by Hunan Kebao Chemical has brought FRP engineers a better choice, which has solved the above technical problems and made it easy for manufacturers to produce high quality The FRP products and molds have a profound impact on the FRP industry. The introduction of this product has caused great repercussions in the FRP industry at home and abroad. It is widely used in the development of FRP products in automobile, train, model, mold and other industries