What is novolac vinyl ester?
Product Type Lining Chemistry Novolac Vinyl Ester. A two component, heavy duty vinyl ester coating reinforced with glass flake to increase chemical and abrasion resistance. A chemically resistant, vinyl ester coating which can be applied using standard airless spray equipment at material temperatures up to 35°C (95°F).
What is vinyl ester coating?
Vinyl ester coatings provide the ultimate in chemical and solvent-resistance. Vinyl ester resins are a cross between polyester resins and epoxy resins. These coatings typically exceed both polyester and epoxy in corrosion resistance, temperature resistance, and elongation (toughness).
What is the structure of novolac?
Novolacs are phenol–formaldehyde resins with a formaldehyde-to- phenol molar ratio of less than one and are prepolymers for cured phenolic resins. Polymerization is completed using acid catalysts such as oxalic, hydrochloric or sulfonic acids. Novolacs dissolve in organic solvents.
Is novolac a polyester?
Epoxidized phenolic novolac: A novel modifier for unsaturated polyester resin.
What is vinyl ester resin made of?
Vinyl ester resins are produced by the reaction (‘esterification’) between an epoxy resin and an unsaturated monocarboxylic acid. Essentially they comprise a base of polyester resin strengthened with epoxy molecules in the backbone of the molecular chain. Vinyl esters also use peroxides (e.g. MEKP) for hardening.
What color is vinyl ester resin?
700 Vinyl Ester Resin – 1 Gallon. Color is Dark Amber/Purple. The appropriate amount of Hardener / Catalyst is included (MEKP 925 or Methyl Ethyl Ketone Peroxide).
What is the difference between polyester resin and vinyl ester resin?
Vinyl esters are more tolerant of stretching than polyesters. This makes them more able to absorb impact without damage. The cross bonding of vinyl esters is superior to that of polyesters. This means that vinyl esters bond to core materials much more effectively than polyesters and delamination is less of an issue.
Is vinyl solvent resistant?
Vinyl Ester – or Vinylester – is a resin produced by the esterification of epoxy resin with unsaturated monocarboxylic acid. Vinyl ester resins offer in general excellent resistance to acids, alkalis, hypochlorites, and many solvents.
What are novolac resins?
Novolac resins are amorphous (not crystalline) thermoplastics. As they are most typically used, they are solid at room temperature and will soften and flow between 150° and 220°F (65°C – 105°C). The number average molecular weight (Mn) of a standard phenol novolac resin is between 250 and 900.
What kind of chemical resistance does novolac vinyl ester have?
Novolac vinyl ester resins are one of the resins which provide excellent chemical resistance. It has high thermal resistance and good mechanical properties and chemical resistance even at high temperatures. Suitable for hand lay-up and RTM production methods.
When to use polyester and vinyl ester coatings?
Polyesters and vinyl esters are used in applications that require resistance to aggressive chemicals and elevated temperatures as high as 212 F (100 C) wet or 350 F (177 C) dry. Uses include tank linings; floor linings; secondary containment lin- ings; and coatings for structural steel, walls, and ceilings.
Which is more resistant to hydrolysis polyester or vinyl ester?
Suitable for hand lay-up and RTM production methods. Vinyl ester resins have low polar groups on chemical backbone and are more resistant to hydrolysis compared to polyester resins. Vinyl ester resins have low polar groups on chemical backbone and are more resistant to hydrolysis compared to polyester resins.
What kind of resin is used for ve?
VE resins are a combination of both polyester resin and epoxy resins best properties. While they have high mechanical strength values similar to epoxy resins, they are easy to apply similar to unsaturated polyester resins. The matter of choice for composite structures where material has exposure to aggressive chemicals.