Determination of oilabsorption value by mixing Pigment and oil

This method essentially involves mixing the paint with the oil without applying pressure.

Weigh 5 grams of paint into a round bottom beaker; then drip the oil into the beaker from the dropper. Add 0.3 ml initially, then 2-3 drops each time, and finally 1 drop. Each time, 1-2 minutes after injecting the oil, stir the mixture with a glass rod or bakelite rod with a national head (without adding pressure). (Related instrument: mixer)

As the amount of oil added to the pigment increases, more and more individual agglomerates are formed which, when stirred, initially break up and then coalesce into larger agglomerates. Stop adding oil until all the paint turns into a ball.              

The oil absorption can be obtained by connecting formulas (1) and (2):