Cationic modification and dyeing of ramie

A method dyeing the ramie fabric with ramazol reactive dyes after its cationic modification with PECH-amine has been examined.The optimum conditions of cationic modification of ramie fabric are cationic agent concentration,10%(owf);NaOH concentration,2 g/L;reaction temperature,50 ℃;reaction time,50 min.The optimum dyeing conditions of the modified ramie fabric is sodium sulfate concentration,50 g/L;sodium phosphate concentration,8 g/L;dye concentration,3%(owf).Moreover,color yield,K/S values and color fastness of the treated fabric were compared with that of the untreated.Results obtained signify that modification with this agent was found to increase the color yield and K/S values significantly.The fastness to washing and rubbing was also excellent.