Determination of water content in epoxy resins
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Recently, we analyzed an epoxy resin; the amount of sample was quite large, and we will be working on this regularly in the future. The content is around 500 ppm, and I want to use a Karl Fischer titrator to determine it. However, I’m not sure whether epoxy resin can be dissolved in methanol-based Karl Fischer reagent. From some sources I’ve consulted, it seems that phenolic reagents are used for this purpose, and **furan is used to dissolve the resin. I ask for the guidance of all teachers.
Liquid epoxy resin? It is generally dissolved in acetone, and then the moisture content is measured; by subtracting the water content in the acetone, what remains is the moisture content in the epoxy resin. Or you can customize the Karl Fischer reagent by replacing the methanol in it with propanol.
We have a moisture meter that uses microwave technology to provide results in 1 second, but it requires calibration
Also, the accuracy of moisture meters based on the thermogravimetric principle is fairly good; I’m not sure what the ignition point of epoxy is