STUDIES ON THE DYEING OF POLYPROPYLENE FIBRE

Though it has been known that polypropylene can easily be sulfonated with fuming sulfuric acid, ClSO H etc, practical method is little known.This study was carried out for the purpose of improving the dyeing properties of polypropylene fibres, especially with regard to sulfonation. In this report, polypropylene fibres were treated as follows.(1) Fibre was treated in the solution of mixture CH3Cl and ClSO3H.(2) Fibre was treated in variously concentrated fuming sulfuric acid solutions and washed with CCl4(3) Fibre was treated with ClSO3H dissolved in the mixture of CH3Cl, CCl4.(4) Fibre was treated in the upper layer of the mixed solution of CCl4 and ClSO3H, or of fuming sulfuric acid solution.In all cases, the treated fibres neither coloured nor fused, but a little colouring was observed at high temperature. And the physical properties of the sulfonated fibres decreased slightly in tensile strength and elongation increased. Those fibres have affinity to basic dyes and dispersed dyes.