Blown oil

A blown oil is a drying oil which has been modified through an oxidative process.

Description

Oils are "blown" through partial oxidation of the oil at elevated temperatures. A typical blowing process involves heating the oil to 70 to 120 °C (158 to 248 °F) and passing air through the liquid.[1] The modification causes the formation of C-O-C and C-C cross links, and hydroxyl and carboxyl functional groups.[1]

Blown oils are chemically different from oils modified only by heating,[1] which are known as stand oils.[2]

Some common types of oils that can be blown include linseed oil, rapeseed oil, castor oil and soybean oil.

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References
  1. Lower, E. S. (1987). "Blown (air oxidised) vegetable & marine oils & paint manufacture". Pigment & Resin Technology. 16 (5): 7–10. doi:10.1108/eb042356.
  2. "The differences between stand oils and blown oils", www.seatons-uk.co.uk, retrieved 1 February 2015


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