The solid stuff used to make glazing putty is just a filler. It doesn't
matter what you mix the linseed oil with. It could be anything that's
cheap and easy to grind into a fine powder.
No, that part I fully understand.
Muck dries to form mud. If you get mud wet, it turns back into muck
Cement cures to form concrete, but concrete doesn't soften up again if
it gets wet.
It's the chemical reaction(s) that occur in concrete (but not in mud)
during the "drying" process that make it irreversible.
But, I wouldn't say that "polymerize" is a good word to use here either.
In order to have a polymer, you need to have multiple "mers", each of
which is chemically identical to all the other mers. In vegetable oils,
you have multiple different kinds of fatty acids in every different kind
of vegetable oil. Linseed oil, for example contains linolenic acid,
linoleic acid, oleic acid, palmitic acid, stearic acid and I expect
trace amounts of other fatty acids as well. And, the crosslinking that
occurs as it "dries" to form a solid is as likely to happen between
unsaturated sites on the same linseed oil molecule as it is between
unsaturated sites on the fatty acids of neighboring linseed oil
molecules. So, you don't have the repeating pattern that you find in
polymers like polyethylene or polypropylene, say. The only chemical
group you'll find consistantly repeated a substantial number of times in
dried linseed oil would be the oxygen crosslinks themselves, and I'm not
sure that would be enough to call dried linseed oil a "polymer".
I think it would be better to say that drying oils "cure" to form a
solid when exposed to oxygen cuz the solid they form doesn't consist of
the same chemical group(s) repeated over and over and over again in any
regular or predictable pattern.
we're both right, but it's not really called drying.
Linseed oil is a "drying oil", as it can polymerize into a solid form.
Due to its polymer-forming properties, linseed oil is used on its own or
blended with other oils, resins, and solvents as an impregnator and
varnish in wood finishing, as a pigment binder in oil paints, as a
plasticizer and hardener in putty and in the manufacture of linoleum.
The use of linseed oil has declined over the past several decades with
the increased use of synthetic alkyd resins, which function similarly
but resist yellowing.
Being most people will find their way to Google, instead of a newsgroup,
I'm surprised you asked here.
Take that plumber's putty and stick it up your ass. It may clog you up for
a while, it will always break free since you're walking around with you
thumb up your ass.
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