Vinyl ester resin is a kind of modified epoxy resin obtained by the reaction of bisphenol or phenolic epoxy resin and methacrylic acid. It is usually called vinyl ester resin (VE). . Vinyl ester resin inherits the excellent characteristics of epoxy resin, and has better curability and moldability. It can be dissolved in styrene and acrylic monomers. Due to the advantages of both epoxy and unsaturated, its application field is constantly expand.
The product is produced by the reaction of epoxy resin (such as bisphenol A or tetrabromobisphenol A epoxy resin, epoxy novolac and diepoxy polyoxypropylene, etc.) and unsaturated monocarboxylic acid (such as acrylic acid, methacrylic acid, etc.) Dilute with styrene to get the product. The side hydroxyl groups of the reaction product of epoxy resin and acid can be modified to obtain more varieties of vinyl ester resin.
2. Development History
Vinyl ester resin is made from epoxy resin and methacrylic acid through a ring-opening addition chemical reaction. It retains the basic segment of epoxy resin and has good process performance of unsaturated polyester resin. After curing under suitable conditions, it shows some special excellent properties. Therefore, since the 1960s, it has achieved rapid development. First, Shell Chemical launched the Epoccrgl brand, then in 1966, the Dow Chemical launched the Derakane brand, followed by Ashland Chemical’s Hetron brand. , And the Ripoxy brand of Japan's Showa Polymer Co., Ltd., other foreign brands or manufacturers include AOC, Interplastics, etc., and domestically also develop their own vinyl ester resins, such as Huachang MFE, Shangwei SWANCOR, etc. With the development of vinyl resins, there are more and more enterprises producing vinyl ester resins, so there are many brands and varieties on the domestic and foreign markets.
3. Product Types
Due to the different processes and methods of resin synthesis, the structure, performance and application of various vinyl resins will be slightly different.
3.1. Standard bisphenol A epoxy vinyl ester resin
The 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, which allows the vinyl resin to cure rapidly, and it quickly obtains the strength of use, resulting in a polymer with high corrosion resistance; synthesized using methacrylic acid, the methyl group on the side of the ester bond can protect Improve hydrolysis resistance; the resin contains less ester bonds, which is 35-50% less per mole than chemical-resistant polyester (bisphenol A-fumaric acid UPR), which improves its alkali resistance; more secondary hydroxyl groups can improve the The wettability and cohesiveness of the glass fiber improve the mechanical strength of the laminated product; because it is only cross-linked at both ends of the molecule, the molecular chain can be stretched under the action of stress to absorb external forces or thermal shock, showing micro-resistance Cracked or cracked.
4. Typical applications
Application of vinyl resin
1. Make corrosion-resistant FRP products, such as glass fiber reinforced plastic tanks, pipes, towers, and corrosion-resistant grids.
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 and so on.
3. Heavy-duty anti-corrosion glass flake coating and flake cement.
4. Others such as UV inks, heavy-duty anti-corrosion industrial floors, etc.
5. Power plant desulfurization and corrosion resistance, high temperature resistance, strong acid and alkali resistance.
6. The workbench of the chemical workshop is resistant to acid, alkali and corrosion.