Process for surface treatment of carbon fiber

Details Process for surface treatment of carbon fiber Process for surface treatment of carbon fiber

D - Textiles, Paper

01

F

204/80

D01F 11/16 (2006.01) C08J 5/06 (2006.01) D06M 10/00 (2006.01)

Patent

CA 1306971

ABSTRACT OF THE DISCLOSURE A process for the surface treatment of carbon fiber tows each consisting of a multiplicity of filaments, comprises treat- ing the tows by electrolytic oxidation, using each tow as a positive electrode and applying an electric current in the form of pulses. The pulse spacing is such that the electric supply and non-supply durations are 0.02-20 sec. each, preferably 0.1-5 seconds each. The pulse shape is rectangular, triangular, or sine waves. The applied voltage is 3-15 V and the current density 0.2-1000 A/m2, preferably 1-100 A/m2, more preferably 5-20 A/m2. The electrolyte is an aqueous solution of an oxidiz- ing agent, strong acid or base, neutral salt, or weak acid or base.

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