STUDIES ON REDUCING THE SURFACE FRICTION OF ELASTOMERS
NAVAL RESEARCH LAB WASHINGTON DC
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Methods for reducing the surface friction of elastomeric vulcanizates were investigated, and frictional data were obtained on polytetrafluoro ethylene coatings sprayed from aqueous dispersions onto elastomeric vulcanizates. Compounding polytetrafluoroethylene TFE resins with neoprene and silicone elastomers produced vulcanizates having inferior physical properties with no decrease in surface friction. Polytetra fluoroethylene coatings on elastomer vulcanizates provided surfaces having low coefficients of friction, which adhered sufficiently well for many applications although they are not as durable as similar coatings on metal. Lower values for the coefficient of sliding friction between metalelastomer surfaces were obtained by coating the elastomer surface with TFE than by coating the metal surface. The surface friction al characteristics of TFE coated vulcanizates were essentially independent of the hardness of the vulcanizate, in marked contrast to the behavior of uncoated elastomers. The frictional behavior of coated elastomers was virtually independent of the thickness of the elastomer substrate.
- Coatings, Colorants and Finishes