Research On The Bleaching Technique For Flax Textile With Total Chlorine Free Method

In this paper, we theoretically and experimentally discussed a new bleaching technique using environmental friendly peracetic acid as initial bleacher for flax textile by two-step Total Chlorine Free (TCF) method. For the first-step bleaching, peracetic acid is to analyze the effect of various factors (concentration, temperature, bleaching time stability and PH on peracetic bleaching, as well as to determine the best bleaching conditions with peracetic acid through optimum choosing. By comparing the bleaching results of peracetic acid and sodium hypochlorite ,it is shown that peracetic acid is better than sodium hypochlorite in bleaching. The impact of peracetic acid on the removal of lignin in flax is also studied in thesis.For the general two-step bleaching technique, peracetic acid are used as the initial bleacher, peracetic acid and hydrogen peroxide used as the further bleacher, to investigate the bleaching effect of flax textile, and are compared with the technique that sodium hypochlorite is used as initial bleacher and hydrogen peroxide as further bleacher through industrial tests. It is concluded that the bleached flax textile can not only meet the HB standards in whiteness, strength of extension and capillary effect by the two-step bleaching technique after pretreatment, but also match the bleaching technique of sodium hypochlorite in production cost. It is proved through experiments that this technique can well substitute the common-adopted bleaching techniques concerned with chlorine in present industry, and will greatly improve the influence of flax bleaching over the environment,and will attain the aim of controlling the linen-textile industry pollution. The results of the experiments lay a promising foundation for the adoption of the new TCF bleaching technique for flax textile, and will make great contribution for promoting the progress of our country's flax textile industry and improving flax textile quality. It would have widen market prosperity, huge economy and social profit, and will be greatly meaningful for enhancement of international competence of our country's linen-textile industry.