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How to make the emulsion

Page history last edited by Nancie Ravenel 15 years, 1 month ago

 

 

              

 

According to the information sheet from Noveon, you can add up to 60-80% by weight solvent into an aqueous gel prepared with Pemulen TR2 at a pH range of 4-5.

 

At Shelburne Museum, typically we've found that the gel needs to have a pH of 7.5-8 to effectively remove oily grime from a surface, and we haven't tried to add more than 20% solvent to a gel to create an emulsion. 

 

Solvent is added to the prepared gel in a screw top jar.  The lid is screwed on tightly and the jar is shaken by hand until a milky emulsion is formed and all of the solvent is incorperated.

 

Stable emulsions have been made by adding 20mL. or less benzyl alcohol to 200 mL.of an aqueous gel prepared wtih Pemulen TR2 at pH 7.5-8.

 

Stable emulsions have been made by adding 20 mL. petroleum benzine to 200 mL. of an aqueous gel prepared wtih Pemulen TR2 at a pH 7-8.5.  The jar needs to be shaken longer and harder to create the emulsion with petroleum benzine than when benzyl alcohol is added.

 

The emulsions made at Shelburne have appeared to be stable over the course of time, for periods up to a month.  However, in practice, some of the solvent seems to sink down towards the bottom of the jar overnight. We shake jars of emulsion to redistribute solvent prior to decanting out small amounts to use for cleaning.

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