| 配方类型： |
EMULSIONS AND OTHER COLLOIDS |
| 配方说明： |
Spontaneous Resin Emulsion |
| 配方组成： |
Where no colloid mill is available and an emulsion of wide
particle-size range is satisfactory, spontaneous resin emulsions may be
prepared by using formulae such as No.1 and 2 that follow. A procedure
for preparing this type of resin emulsion is:
Step 1. Dissolve the resin in the solvent at room temperature and then
add the oleic acid. Best results are obtained when this resin solution
has a viscosity of 25 to 35 poises at room temperature. The cited
proportions of resin and solvent should give a viscosity falling within
this range.
Step 2. Prepare the potassium hydroxide solution by dissolving the
indicated amount of solid potassium hydroxide in the water specified, or
by appropriate dilution of a more concentrated potassium hydroxide
solution, to give the 2.5% solution indicated.
Step 3. Slowly add the potassium hydroxide solution to the resin
solution while stirring vigorously, preferably by a power-driven
stirrer, until a viscous |
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