MEKPMethyl Ethyl Ketone Peroxide
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Different parameters were varied: the MEKP concentration, reinforcement layer thickness, acrylic material was heated or not, reinforcement layer was with or without the glass fibres, etc.
It is most appropriate for resin systems that employ MEKP or acetyl acetone peroxide (AAP) cures.
Even though there are several controversial interpretations about the origin of these exothermic peaks [10-15], the first peak can be attributed to the polymerization initiated by a redox decomposition of methylethylketone peroxide (MEKP), and the second one to the polymerization initiated by the thermal decomposition of MEKP at high temperatures.
At the same time, open-mold fabricators switched from solid BPO to liquid MEKP as the preferred initiator ingredient because of its relative safety and ease of use.
MEKP initiator and CO activator were added to the resin immediately prior to mixing.
The initiator for high temperature curing was Trigonox 42 PR by Akzo, a modified aliphatic perester solution developed for use with a metal salt accelerator at temperatures in the range of 18-110 [degrees] C, and the initiator for room temperature curing was MEKP by Fluka; both at a level of 2 wt% on the resin.
Hi-point 90 Blue MEKP is for use in clear or white resins.
The order should be DMA added first, then the CoNap, then the MEKP with stirring after each addition.
Cobalt naphthanate (CO, Troy Chemical) was used as a promotor for MEKP, and the content of CO was 25 wt% of MEKP.