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Brazilians Blend MEKP and AAP Peroxides

02 October 2009

MVC hope to set a new trend within Brazil by using a mixture of peroxides in the polymerization of composites parts, rather than relying on a single peroxide such as methyl ethyl ketone peroxide (MEKP).

“The blend fully improves the production process, as it allows the molder to benefit from the advantages offered by two different peroxides”, says Roberto Pontifex, CEO of Polinox, a manufacturer of organic peroxides and mould release waxes.

This system has been successfully used in the continuous lamination of plates used in CasaPrática, which was built using Wall System technology and the RTM process.

“We [ran] dozens of tests in our laboratory to show what would be the percentage of an ideal mixture for some of the products we manufacture. We picked a standard resin and determined the gel time, period of reaction and exotherm peak, among other important characteristics of a lamination plan”, said Cláudio Thiago, technical manager of MVC. These tests were all based on MEKP and acetyl acetone peroxide (AAP) blends.

“The combined use of these products ensures a lower polymerization time and, consequently, a faster mould release”, says Thiago.

MVC blended peroxides depending on the specific needs of the application, which the company claims gave them increased efficiency. “For example, by manufacturing a specific component of 15 m², a blend containing 60% of MEKP and 40% of AAP presented a gel time of 20 minutes. If it were made with MEKP only, the gel time would be 30 minutes and with AAP only, it would take from 38 to 40 minutes. That is, the use of both peroxides together is more beneficial than each one separately”, Thiago says.