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Methyl ethyl ketone peroxide (MEKP) is an organic peroxide with the formula [(CH 3)(C 2 H 5)C(O 2 H)] 2 O 2. MEKP is a colorless oily liquid. It is widely used in vulcanization (crosslinking) of polymers. [3] It is derived from the reaction of methyl ethyl ketone and hydrogen peroxide under acidic conditions.
Thus, organic peroxides are useful as initiators for some types of polymerization, such as the acrylic, unsaturated polyester, and vinyl ester resins used in glass-reinforced plastics. MEKP and benzoyl peroxide are commonly used for this purpose. However, the same property also means that organic peroxides can explosively combust.
Since vinyl ester resins must be pre-accelerated with amine accelerator or cobalt, their processing time at room temperature is shorter than with epoxy-based prepregs. Catalysts (also called hardeners) include peroxides such as methyl ethyl ketone peroxide (MEKP), acetyl acetone peroxide (AAP) or cyclohexanone peroxide (CHP).
Renewable precursors to vinyl ester resins have been developed. [2] Vinyl resins are often used in repair materials and laminating because they are waterproof and reliable. Bisphenol A is a precursor in production of major classes of resins, including the vinyl ester resins along with epoxy resins and polycarbonate.
Figure 3: Simplified chemical reactions associated with curing of a drying oil. In the first step, the diene undergoes autoxidation to give a hydroperoxide. In the second step, the hydroperoxide combines with another unsaturated side chain to generate a crosslink. [4] Epoxy resins are typically cured by the use of additives, often called hardeners.
The most common resin system used for the spray-up process is general purpose or DCDP polyester; isophthalic polyesters and vinyl ester resins are also sometimes used. Fast-reacting resins with a pot life of 30 to 40 minutes are typical. The resin often contains a significant amount of filler.
[5] Benzoxazine resin synthetic pathway, structure and cure mechanism. Cure is characterised by expansion rather than shrinkage and uses include structural prepregs, liquid molding and film adhesives for composite construction, bonding and repair. The high aromatic content of the high molecular weight polymers provides enhanced mechanical and ...
Vinyl resin may refer to: ... Vinyl ester resin, also known as just "vinyl ester" This page was last edited on 25 April 2020, at 16:49 (UTC). Text is available ...