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Friday, September 13, 2019

Prepration of An Emulsifying Petrolatum

We are investigating a number of candidate emulsifying petrolatum formulations for use in acrylic paint production.

Oil-to-water emulsion.
Top left: water , tripropylene glycol and lecitihin.
Top right: n-butyl recinoleic acid (derived from castor oil), castor wax, esterified succinic acid (di-cetyl ester) and lanolin.
Solutions prepared by heating to 70-80 deg C and the oil is added with stirring to the aqueous .
Stir well 2-3 minutes while heating followed by pouring into pan and stirring well until congealed.
The emulsion is left at 20 deg c overnight (open to atmosphere) and then checked for emulsion stability.

Above: product obtained by heating succinic acid anhydride (10 g) with two (2) molar equivalents (48 g) of cetyl alcohol at 160-170 deg with stirring. After 20 minutes, 5 g lanolin added. Esterification/ transesterification is brought about.
The homogeneous solution is then poured into a metal pan and cooled to solidify. The substance has the look of cocoa butter . This material has the feel of a hard wax like castor.  It was used as one of the emulsion components.
A small amount of the emulsion was blended with an equal mass of an acrylic paint and had excellent brush flow on cardstock.

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