Vinyl Ester Over Epoxy
Before coating a fully cured layer of epoxy with polyester gelcoat prepare the surface properly to remove any amine blush.
Vinyl ester over epoxy. Has some great papers on this which i am quoting from. Using epoxy you can improve the laminate properties with a post cure almost always. Wash away amine blush with water and an abrasive pad such as a 3m 7447 hand pad. Regarding costs vinyl ester resin is more expensive than polyester resin but cheaper than epoxy resin.
Epoxy adheres to wood much better than polyester does. The two main types of epoxy resins are bisphenol a diglycidyl ether dgeba and epoxy phenol novolac epn. Specifically proper cure of vinyl ester resins and a 15 year study of the effective use of permeation barriers in marine composites to prevent corrosion and blistering. The hardener catalyst for vinyl ester resin and polyester resins is mekp.
Epoxy vinyl ester resins ver are an important class of high performance thermoset molding resins. Epoxy resin is an ideal resin for high performance and light weight parts. Essentially they comprise a base of polyester resin strengthened with epoxy molecules in the backbone of the molecular chain. Cured epoxy tends to be very resistant to moisture absorption.
Vinyl esters also use peroxides e g. Allow the epoxy to cure to the point where sanding produces a fine powder. Vinylester is essentially a styrene modified epoxy resin. It adds excellent strength rigidity adhesion water and chemical resistance.
Quality epoxy resins stick to other materials with 2 000 p s i. To cover wood a laminate using epoxy resin and 10 oz cloth will yield a much better job than 10 oz. They are produced by the addition of α β unsaturated carboxylic acids to epoxy resins. Cloth and polyester resin.
In areas that must be able to flex and strain with the fibers without micro fracturing epoxy resins offer much greater capability. In the case where a part originally manufactured utilizing polyester or vinylester has yielded to strain and cracked a well reinforced epoxy repair will tenaciously hold to the substrate with 2000 psi strength vinylester. Vinyl ester resins are produced by the reaction esterification between an epoxy resin and an unsaturated monocarboxylic acid. Before applying gelcoat over epoxy.