EFFECT OF WATER AND PARTICULATE CONTAMINATES ON POLYMER SHEAR STABILITY.
ARMY WEAPONS COMMAND ROCK ISLAND ILL RESEARCH AND ENGINEERING DIV
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Polyisobutylene and polymethacrylate viscosity index improver additives were tested in oil solution for shear stability by the sonic irradiation technique, with and without added water and solid particle contaminants. The shear breakdown of polyisobutylene was significantly reduced at low water concentrations and nearly completely blocked at high water concentrations. The shear stability of the polymethacrylate solutions was not significantly affected by water. Neither polymers stability was affected by particulate contamination. It was concluded that sonic shear methods may be used in the presence of solid particle contaminants and in the presence of water contaminants for shear stability determinations on polymethacrylate-oil solutions. Insofar as sonic shear methods reflect shear stresses on hydraulic oils, these results indicate that such contaminants would not adversely affect polymer shear stability at the low concentration levels normally found in such oils. Author
- Lubricants and Hydraulic Fluids