stygian
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Alkyd "oil content"
Being oil-derived I guess this is the right place.
How exactly are short, medium, and long oil content determined with these resins? After the initial alcoholysis, there should be no oil left, unless
more is added at a later point as a simple mixture. This has me a bit confused.
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JohnWW
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The answer may be in Luthria's "Oil Extraction & Analysis", which I have uploaded to rapidshare.com, and of which I posted the downloading link in
the Organic Chemistry thread of the References section. If you cnnot find the link, I will send it to you privately.
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not_important
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SFAIK the oil content is determined at time of manufacture, by how much oil or fatty acid is added. Oil content is sometimes given as weight percent
of oil mixed into the polyester, other times as the three classes as you listed, with short having the least percentage of oil/fatty acid. Again, this
is a measurement done prior to mixing and reacting, not a measurement of the finished resin except as what percent of its weight is derived from the
raw ingredient oils.
As an aside, not all the oil/fatty acid gets bound up into the polyester, some small amount remains free as it is not economical to force full
esterfication. However, as these are drying oils most of the free oil/fatty acid ends up cross-linking with their esterfied compatriots.
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stygian
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| Quote: | Originally posted by JohnWW
The answer may be in Luthria's "Oil Extraction & Analysis", which I have uploaded to rapidshare.com, and of which I posted the downloading link in
the Organic Chemistry thread of the References section. If you cnnot find the link, I will send it to you privately. |
This would be appreciated. I do not have access to the references section (how does one get access? I've been quite inactive and honestly haven't
even tried to)
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