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General
- Drying oil is a kind of
vegetable oil which drys in normal temperature. Linceed oil, Poppy oil,
Walnut oil, Sunflower oil and Safflower oil are known as typical drying
oil.
- Other kind of oils do
not dry in normal temperature. Drying oil is the basic vehicle of oil
paints. The more you incrude this
oil into paints, the more the paints have transparensy and glossy.
- Drying oil can be
increased its ablity by bleaching under the sun, heating to high
temrelature or boiling. Bleached drying
oil is called "Sun-Bleached oil" or "Sun-Thickened oil". Heated one is
called "Stand oil".
Process
- Small-scale oilseed
processing is of interest as a potential on-farm or community enterprise
that can increase income and
employment in rural areas .
- Many seeds, nuts, and
kernels contain oil that can be extracted and used in cooking, as an
ingredient in other foods, as a
nutritional supplement, and as a raw material for the manufacture of soap,
body and hair oils, detergents, and paints.
- Some of these oils may
also be used to replace certain petroleum based lubricants and fuels.
Currently, biodiesel, which is
esterified vegetable oil, has found a market niche because its use reduces
some noxious exhaust emissions.
Market
- Painters employed
drying oils such as walnut oil and linseed oil occasionally for special
effects from the twelfth to the
fourteenth centuries.
- During the fifteenth
century oil painting was increasingly used as a fine arts medium, and in
the sixteenth century it became the principal painting method in
northern Europe and Italy.
Report
- Studies on the model
compounds showed that DEAE can react with the acidic components of
paintings, in particular with the resin acids in natural resin varnishes,
and free fatty carboxylic acid in drying oils.
- However, DEAE does not
react with carboxylic esters of glycerol, and therefore is unlikely to
react with the triglyceride
esters that comprise the major component of drying oils.
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