2. DRYING OIL
• Glycerides of unsaturated acids having 2
or more double bond absorb O2 from air
and get polymerised to form hard
tranparent coating which is making
paints and oil cloth.
• Drying oil is an oil which hardens to a
tough, solid film after a period of
exposure to air(oxidation)
4. • Fatty acid contain conjugate double
bond are drying take place more
rapidly compared as non conjugate
fatty acid
• Drying process can be achieved
faster by addition of driers like salt of
mangnese ,lead,cobalt etc…
DRYING OIL
5. Chemistry of Drying Oil
conjugate unsaturated fatty acid
↓Autoxidation
Hydroperoxide + conjugate unsaturated
fatty acid (another molecule)
↓Polymerization
stable , some what elastic and
Hard transparent coating which is
used in making paint and cloth
6.
7. Classification
• Drying oil
when exposed to air, undergo oxidation and form
tough and hard film. These are usually used in
paints and varnishes. For example; Linseed oil
• Non-Drying oil
These oils neither undergo oxidation nor form
tough and hard film. For example; Olive oil
• Semi-Drying oil
When exposed to air, undergo little bit oxidation
and form tough and thin film.
For example; Cotton seed oil
8. Applications
• Low Temperature Fast Curing Coatings for the
Surface Treatment of Wood Composites
Panels
• A Realistic Appraisal of Soy Oil Printing Inks
• Drying Oils or Mediums Used in Oil Painting
• Selection and Application of Exterior Stains for
Wood
• Microencapsulation of oil in tablete
Ex:omega‐3 polyunsaturated fatty acids (ω‐3
PUFAs),
