The difference between vinyl resin and epoxy resin is that the most prominent advantage of using vinyl resin instead of epoxy resin is that it can reduce the cost of blades. The cost of blades accounts for 20 to 30% of the cost of the entire power generation device, so material selection is crucial. Changing the epoxy resin to vinyl can reduce the cost by about 10%.
1. Vinyl resin
Vinyl Ester Resins is an internationally recognized highly corrosion-resistant resin.
Standard bisphenol A epoxy vinyl resin is a vinyl resin synthesized by the reaction of methacrylic acid and bisphenol A epoxy resin. It is easily soluble in styrene solution. This type of resin has the following characteristics :
1. The double bonds at both ends of the molecular chain are extremely active, allowing the vinyl resin to solidify quickly, gain strength quickly, and obtain a highly corrosion-resistant polymer;
2. It is synthesized with methacrylic acid. The methyl group on the side of the ester bond can play a protective role and improve the hydrolysis resistance;
3. The resin contains less ester bonds and is chemically resistant to polyester (bisphenol) per mole ratio. A-fumaric acid UPR) is 35-50 less, which improves its alkali resistance;
4. More secondary hydroxyl groups can improve the wettability and adhesion to glass fiber, and improve the lamination The mechanical strength of the product;
5. Because it is only cross-linked at both ends of the molecule.
Flame-retardant vinyl resin is generally synthesized from brominated epoxy resin. Because the resin contains bromine, flame-retardant vinyl resin is both chemically resistant and flame-retardant.
2. Novolac epoxy
Introducing phenolic epoxy resin into the skeleton of vinyl ester resin, the synthesized vinyl ester resin is generally called Novolac vinyl ester resin. The resin has high thermal stability. After the resin is cured, the cross-linking density is high. Its heat distortion temperature reaches 120-135°C, which can extend its service life and has excellent corrosion resistance, especially for chlorine-containing solutions or organic solvents. In order to meet the needs of high temperature resistance, many manufacturers have modified phenolic epoxy vinyl ester resin to improve the cross-linking density and heat resistance of the resin, which has excellent acid resistance, solvent corrosion resistance and oxidation resistance. , suitable for various high temperature and strong corrosion situations, such as desulfurization devices (FGD), high temperature chimneys, etc.
3. Epoxy resin
Epoxy resin refers to the general name of a type of polymer containing more than two epoxy groups in the molecule. It is the condensation product of epichlorohydrin and bisphenol A or polyol. Due to the chemical activity of the epoxy group, a variety of compounds containing active hydrogen can be used to open the ring and solidify and cross-link to form a network structure, so it is a thermosetting resin. Bisphenol A-type epoxy resin not only has the largest output and the most complete varieties, but new modified varieties are still increasing, and the quality is constantly improving.
IV. Epoxy Resin Classification Standards
The classification of epoxy resins has not yet been unified. They are generally classified according to strength, heat resistance level and characteristics. There are 16 main varieties of epoxy resins. , including general glue, structural glue, high temperature resistant glue, low temperature resistant glue, glue for water and wet surfaces, conductive glue, optical glue, spot welding glue, epoxy resin film, foam glue, strain glue, soft material adhesive 16 types of adhesives, sealants, special adhesives, latent curing adhesives, and civil construction adhesives.
5. Several classifications of epoxy resin
There are several ways to classify epoxy resin adhesives in the industry:
1 , according to its main components, it is divided into pure epoxy resin adhesive and modified epoxy resin adhesive;
2. According to its professional use, it is divided into mechanical epoxy resin adhesive, construction use Epoxy resin adhesives, electronic epoxy resin adhesives, repair epoxy resin adhesives, traffic glues, ship glues, etc.;
3. According to its construction conditions, it is divided into normal temperature curing Glue, low-temperature curing glue and other curing glue;
4. According to its packaging form, it can be divided into single-component glue, two-component glue and multi-component glue;
There are other classification methods, such as solvent-free glue, solvent-based glue and water-based glue. However, component classification is widely used.