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Subject: drying oil for copal-based varnihes
Posted by: Nicole Deridder
E-mail: jpmndr(at)village(dot)uunet(dot)be(no spam)
We are trying to design a manufacturing technique for a copal-based varnish for a development project in RDC. Huge deposit of copal are potentially available but are actually put on the market as raw material with no profit for the population
Up to the fifties, varnishes were manufactured using linseed oil as drying oil. We would like to avoid importing this product. Ricinoil is available but it must be dehydrated in order to become a drying oil.
The technique recommended by textbooks is heat treatment in presence of acid (H2SO4 9N). We tried it but the result was desappointing. The product obtained was a pink viscous gel (addition product of H2SO4 to the existing carbon double bond?)
instead of the expected poly-insaturated C18 diene.
Could someone help me in this? Thanks a lot. - Nicole
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