STEEL CORD FOR TIRE COATED WITH POLYMER DERIVATIVES AND SURFACE TREATMENT METHOD THEREOF

摘要

PURPOSE: A steel cord for a tire coated with polymer derivatives and a surface treatment method thereof are provided to expand the life span of the tire by improving the corrosion resistance and aging adhesive force of a polymer-coated layer formed at the steel cord and to effectively repress the surface degradation of a brass plating layer of steel cord products exposed in the air before producing the tire and kept for a long time by the polymer-coated layer. CONSTITUTION: A method for producing a steel cord forms a brass plating layer made from 60¯70 wt% of copper and 30¯40 wt% of zinc to the surface and twists a plurality of brass plating filaments cold-drawing a high carbon steel wire having 0.6¯0.85 wt% of carbon. A surface treatment method of the steel cord for improving aging adhesive force is composed of steps of removing foreign materials attached on the surface of the steel cord and degreasing the steel cord by submerging and passing the steel cord through a degreasing tank filled with a volatile solvent and arranged with a brushing roll; air-blowing the surface after submerging and passing the steel cord through a washing tank; submerging and passing the steel cord of which foreign materials of the surface are removed and degreased, in a surface treatment solution formed by dissolving at least one of thiazole, imidazole, or oxazole derivatives having at least one thiol and amino group in the molecule in the volatile solvent; and drying the steel cord coated with the surface treatment solution.