I am conducting chemical research on novel paint formulations for artists.
In this experiment, I conducted base-promoted (saponification) of lanolin in glycerol betweeen 165-185 deg. over 30 minutes.
It is anticipated that complete saponification should occur under these conditions in about 30 minutes.
4.0 g sodium hydroxide dissolved in glycerol at 120-130 deg cCin about 15 minutes to yield a bright yellow solution.
The temperature of solution was brought to about 155 deg C (+/- 5 degrees)
25 g lanolin (Fisher Scientific) was added over 30 seconds to the stirred solution of glycerol.
The temperature reached about 180-185 deg c over 30 minutes. A transition in color, viscosity , solubility occurs over this time period. The final appearance is a brown (soap) appearance and is homogeneous at this termperature.
The solution was stirred while the temperature was allowed to drop to about 60-70 deg C over 30 minutes.
At this point , the material is a viscous semi-solid. Additional cooling would afford the soap.
10% H2SO4 was added slowly and stirring continued to bring the soap to a beige-tan emulsion. The PH should be 1-2.
When virtually no solid soap particles are observed, the solution is cooled to ambient temperature.
The beaker contents are transferred to a blender, water added to desired viscosity and blending conducted for 2-3 minutes.
A more viscous emulsion was obtained vs. the results in my previous post.
The soap can be subjected to acetone extraction over 6 hours to separate the fatty alcohols from the fatty acid sodium carboxylates. We will obtain a GC/MS on the acetone extract and compare with the cake extract from conditions described in the prior upload /
The modified lanolin emulsion ( saponified/ acidified in aq. acid/ glycerol) was blended with an inexpensive commercial watercolor (red hue) and 'synthetic petrolatum' (previous upload preparation) along with a small amount (spatula tip) of 'Gold Bond Foot Powder' ( contains talcum, acacia extract and zinc oxide among other components; it does help with brush flow).
Stirring for 15 -30 seconds affords a nice paint formulation.
I applied the paint with bristle / flat brushes to watercolor paper (140 lb).
Next experiment: The use of oil-based paint to form the emulsified paint formulation.
The emulsion starts breaking after 48 hrs at 20 deg C: