PRETREATMENTS FOR IMPROVING THE DYEABILITY OF P-ARAMID FIBERS

A pretreatment method for dyeing Kevlar(R) fibers without dye carriers has been developed. Fibers were metalated by reacting with a methylsu lfinyl anion, the metalated fibers were dyed with cationic and direct dyes, and the resulting coloration and physical properties were evalua ted. The results show that this pretreatment technique can improve the dyeability of Kevlar without compromising mechanical properties. Meta lation improved dyeability more than grafting with either adipoyl chlo ride, benzoyl chloride, or vinyl benzyl chloride.