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Adhesive Academy: Heat Curing 102

Dr. B, Master Bond's resident adhesive expert, explains how to enhance thermal stability, electrical properties, and chemical resistance by using heat when curing epoxies.

Topics:
Materials

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    Transcript

    00:00:06 hi Sam hi dr. B can you meet me in the manufacturing facility sure dr. B see you in a minute I want to continue our conversation about how adding heat to cure epoxy enhances properties you ask how much heat is necessary and for how long it needs to be added a common way of measuring temperature resistance is with glass transition temperature if heat is

    00:00:36 added for one hour at 150 degrees Celsius TG will go up maybe 5 to 10 degrees if you add heat for four hours at 150 degrees Celsius 300 degrees Fahrenheit the TG still increases if you add heat for 12 hours it will go even further realistically adding heat for a couple of hours is fine what if we wanted to test for electrical insulation how is that data affected by adding heat

    00:01:03 the main test data for electrical insulation is dielectric constant dielectric strength dissipation factors and volume resistivity all of these are affected positively by adding additional heat I'm beginning to see a trend here let's say we're looking at electrical conductivity if we take a two part system and let it cure for two to five days is very conductive if we add heat

    00:01:29 for a few hours it's even more conductive that's right Sam you're catching on other areas in which properties enhancements are seen is chemical resistance materials simply won't resist chemicals nearly as well without adding eat and I bet the same goes for physical strength absolutely so that's an overview of the importance of adding heat when curing epoque sees it

    00:01:53 is not emphasized enough so go ahead and spread the word to all your engineering friends you