[pure-silver] Re: Cleaning picture frame glass
- From: Ryuji Suzuki <rs@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 18 Apr 2006 12:25:21 -0400 (EDT)
From: "Peter Badcock" <peter.badcock@xxxxxxxxx>
Subject: [pure-silver] Re: Cleaning picture frame glass
Date: Tue, 18 Apr 2006 21:20:21 +1000
> Why is it better in this case to use a surfactant (a detergent?) with
> negative charges in it? What do the anions do?
What I said wasn't that "anionic is better" but "Triton X-200 is
better for this application." Surfactant is most frequently described
by the hydrophillic group (which determines the charge) but the
performance is equally strongly influenced by the hydrophobic part.
Triton X-200 is good because it has better wetting of dust particles,
faster wetting of the surface by wiping, and degreasing property in
my glass cleaner solution.
Also, if ammonia odor is objectionable, it may be substituted with
ethanolamine (monoethanolamine) for lower odor.
Since someone mentioned this in another post... if isopropanol is used
alone as the cleaner, you'll have to wipe more number of times and
still see streaking. That's a common problem with highly volatile
cleaners. Alcohol solvent simply dilutes the grease a bit and spread
it back on the glass surface.
> Where is it more advantageous to use nonionic (non-charged) surfactant ?
It depends a lot on particular surfactant, compatibility with other
agents in the solution, temperature of working condition, desired
properties, etc.
> Actually I just looked at Wikipedia
> (http://en.wikipedia.org/wiki/Surfactant) and found that some
> nonionic surfactants (such as cocamide
> DEA<http://en.wikipedia.org/wiki/Cocamide_DEA> and cocamide TEA
> <http://en.wikipedia.org/wiki/Cocamide_TEA> ) are used more in
> shampoos, hand-soaps and cosmetics etc. I guess they are more
> gentle.
For those applications, leathering properties, cost of manufacturing,
safety, sensitivity to other ingredients and minerals from water,
etc. are also very important.
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