Marine Composites by John Summerscales Jasper Graham-Jones Richard Pemberton & John Summerscales & Jasper Graham-Jones

Author:John Summerscales,Jasper Graham-Jones,Richard Pemberton & John Summerscales & Jasper Graham-Jones
Language: eng
Format: epub
ISBN: 9780081019139
Publisher: Elsevier Ltd.
Published: 2018-08-20T16:00:00+00:00

8.3.1.3 Exotherm temperature

The resin curing reaction is exothermic. The temperature will begin to climb as soon as the reaction begins (while the resin is still liquid) and will reach its maximum shortly after the resin has solidified. As with gel time, an indication of peak exotherm temperature may be given on the resin datasheet, but the temperature seen when manufacturing the part will be dependent on a number of factors.

High exotherm temperatures are of concern and can damage tooling, consumables, and the component. They can also cause a greater degree of resin shrinkage and will, if very high, have a detrimental effect on the properties of the resin. High temperatures are often seen in areas of thick laminate and around resin inlet galleries where there is a greater bulk of resin. Careful selection of resin and hardener/catalyst can help to keep exotherm temperatures under control, but there are often trade-offs with the cured resin properties and extended gel times.

The cured properties of polyester/vinylester systems are less affected by catalyst selection, but choice of levels does control high exotherm temperatures in thick sections, or expedite the cure of thin laminate (Fig. 8.8).

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