Polyester resins are reinforced with epoxy, which is similar to polyesters and has properties similar to epoxy.
Used in the composite industry to make a variety of composite parts with the highest physical and chemical properties, giving high resistance to chemicals and high thermal resistance, applicable to all types of metal, concrete, polymer, wood, glass, fabric, etc., can be Performed in food, cosmetics, fiber wetting capabilities.
Application of vinyl ester resins
Similar to epoxy resins but have higher chemical resistance and also used in industry:
- Contact Molding
- Filament Winding
- Continuous Laminating
Vinyl esters are the product of the reaction of epoxy resins with unsaturated ethylene acids. Except in special cases, vinyl ester resins usually have unsaturated ends. This end can perform the crosslinking reaction and can also polymerize vinyl ester chains or copolymer with styrene.
Most conventional vinyl esters are made by esterifying a dioxide resin floors with an unsaturated monocarboxylic acid. They can be cured by free radical reaction alone or dissolved in a monomer such as a styrene to obtain a liquid resin. In this case, the vinyl ester can be used like polyester resin.
Vinyl ester resins have much better toughness and chemical resistance than polyester resins. The main epoxy chain made of vinyl ester creates toughness and increases the tensile length. The molecular mass of vinyl ester resins depends on the type of epoxy used. Because of this, the tensile strength, elongation, softening point, and reactivity of the final resin are determined by the molecular mass and initial structure. This makes it possible to design different properties for different applications. Vinyl ester resins have good chemical resistance compared to unsaturated polyesters.
Part of this feature is related to the absence of ester bonds in the epoxy chain. Phenyl ester bonds make the connection of polymer components. These joints are more resistant to most chemical environments, especially in severely alkaline conditions than ester joints. The ester bond is only present at the end of the vinyl ester chain. This minimizes the attacks of chemical agents.
Conventional bisphenol A-based epoxy vinyl ester resins have two reactants along the chain. These vinyl ester resins can be used in most applications in the temperature range of 120-105 ° C. If Novolak-modified epoxy vinyl ester resins have more reactivity sites along the chain. At the same time, with higher density crosslinks after the curing and curing process, they can be used in more severe corrosion conditions and at higher temperatures (flow Corrosive gases up to 240 degrees Celsius). These vinyl ester resins have maximum resistance to acids, alkalis, and solvents.
The most commonly recommended activator for various vinyl ester resins is methyl ethyl ketone peroxide. But unlike polyester resins, which only need a cobalt accelerator along with this activator, vinyl ester resins also need another facilitator, usually dimethylaniline. In some cases, this facilitator is added by the resin flooring manufacturer. Otherwise, it should be added to the resin by the consumer according to the amounts suggested (by the manufacturer).
Properties of vinyl ester resin
Unlike polyester resin, unsaturated vinyl ester resin has fewer unsaturated polyester resins than vinyl ester resin. It makes it more flexible compared to polyester resin.
In the reaction of the epoxy group with the carboxylic group, several hydroxyl groups are formed along the vinyl ester chain, which carries the H bond to similar groups in the glass fibers. Therefore, the vinyl ester resin has more adhesion to the glass fibers than the polyester resin. It is unsaturated. However, such adhesions are more common in epoxy resins because they have a higher hydroxyl group than vinyl esters.
Vinyl ester resin has higher corrosion resistance than unsaturated polyester resin due to many atoms between the ester groups, the low concentration of the ester groups, and.
Importance of using vinyl ester resin
Vinyl ester resin can also be used for all applications where polyester resin is used. This resin can replace metals and polyunsaturated polyester based on FPR for corrosion resistance. They are tanks, pipelines, canals, tanks carrying dilute acids and solvents and fuels, corrosion-resistant mixing tanks, etc.
In the electrical industry, vinyl ester resin is used based on FPR. The manufacture of components for power plants, the manufacture of distribution and transmission equipment, televisions, and antennas are examples of the electrical application of this resin.
Better water resistance makes it suitable for both home appliance and marine industries. Underwater, vinyl ester resin is more resistant than epoxy and is widely used in the marine industry. These include the construction of hulls, fishing boats, boat engines, sails, ships, and naval vessels.
Vinyl ester resin -Hetron 922 epoxy vinyl ester resin
HETRON 922 Epoxy Vinyl Ester Resin
Heteron 922 epoxy vinyl ester resin is one of the most well-known and widely used resins in the country’s industries, widely used in FRP (reinforced plastics) or fiberglass membranes as an impermeable anti-corrosion layer, as well as in the manufacture of pipes, tanks, Industrial parts, and tools are used. Its unique anti-corrosion resistance characterizes Hetron 922 resin in FRP tanks and pipes, corrosion protection of concrete and metal surfaces, and high thermal resistance, easy repair, and very good performance in complex processes conditions.
Vinyl ester resetron 922 is a product of the Saudi SIR factory. The plant is a joint venture between US company Ashland and Saudi private investors.
Fiberglass-reinforced plastics, or FRP, have been used since 1950 in various chemical industries and manufacture various equipment, including fans, pipes, pump bases, and tank linings.
The main use of FRP is its high corrosion resistance.
Other reasons to use the FRP system are:
- High corrosion resistance to a wide range of acids, bases, solvents, chlorides, and oxidants.
- Optimal thermal resistance
- Electrical and thermal insulation
- No need for cathodic protection – no alarm
- Ability to repair
If you need more information, contact our resin flooring company .
Photo Credit: Adobe Stock