1. Introduction
Vinyl ester resin is a type of modified epoxy resin obtained by the reaction of bisphenol or novolac epoxy resin with methacrylic acid. It is usually called vinyl ester resin (VE), alias epoxy acrylic resin, which is a thermosetting resin. . Vinyl ester resin inherits the excellent characteristics of epoxy resin, and is more excellent in curability and formability. It can be dissolved in styrene and acrylic monomers. Due to the advantages of epoxy and unsaturated, its application fields are constantly increasing. expand.
production methods:
By the reaction of epoxy resin (such as bisphenol A or tetrabromobisphenol A epoxy resin, epoxy novolac and diepoxidized polypropylene oxide, etc.) and unsaturated monocarboxylic acid (such as acrylic acid, methacrylic acid, etc., the product Dilute with styrene to get the product. It can be modified by the side hydroxyl group of the reaction product of epoxy resin and acid to obtain more kinds of vinyl ester resin.
2. Development history
Vinyl ester resin is prepared by chemical reaction of epoxy resin and methacrylic acid through ring-opening addition. It retains the basic segment of epoxy resin, and has the good process performance of unsaturated polyester resin. After curing under suitable conditions, it shows some special excellent properties. Therefore, since the 1960s, it has developed rapidly. First, the Epocrgl brand was launched by Shell Chemical in the United States, and then the Derakane brand was launched by Dow Chemical in the United States in 1966, followed by the Hetron brand of Ashland Chemical. , as well as the Ripoxy brand of Japan's Showa High Polymer Co., Ltd., other foreign brands or manufacturers include AOC, Interplastics, etc., and China also develops its own vinyl ester resins, such as Huachang MFE, SWANCOR, etc. With the development of vinyl resin, there are more and more enterprises producing vinyl ester resin, so there are various brands and types in the domestic and foreign markets.
3. Product types
Due to the different resin synthesis processes and methods, the structure, properties and applications of vinyl resins will be slightly different.
Standard type bisphenol A epoxy vinyl ester resin
Standard bisphenol A epoxy vinyl resin is a vinyl resin synthesized by the reaction of methacrylic acid and bisphenol A epoxy resin, and is easily soluble in styrene solution.
This type of resin has the following characteristics:
The double bonds at both ends of the molecular chain are extremely active, so that the vinyl resin can be cured quickly, and the strength of use can be obtained quickly, and a polymer with high corrosion resistance can be obtained. Improve hydrolysis resistance; the resin contains less ester bonds, and each mole is 35-50% less than chemical-resistant polyester (bisphenol A-fumaric acid UPR), which improves alkali resistance; more secondary hydroxyl groups can improve The wettability and cohesiveness of the glass fiber improve the mechanical strength of the laminate; since it is only cross-linked at both ends of the molecule, the molecular chain can be elongated under stress to absorb external force or thermal shock, showing microscopic resistance. cracked or cracked.
4. Typical applications
Application of vinyl resin
1. Make corrosion-resistant FRP products, such as FRP tanks, pipes, towers and corrosion-resistant grilles.
2. Anti-corrosion engineering, such as cement-based or iron-based FRP lining, high corrosion-resistant floor, high-strength FRP products, such as FRP profiles, sporting goods, FRP boats, etc.
3. Heavy-duty anti-corrosion glass flake coating, flake glue.
4. Others such as UV ink, heavy-duty anti-corrosion industrial floor, etc.
5. Desulfurization and anti-corrosion in power plants, high temperature resistance, strong acid and alkali resistance.
6. The chemical workshop workbench is resistant to acid and alkali corrosion, etc.