[직/편성물] Optimised chlorine-free bleaching systems for jute and jute/cotton blend fabrics 출판일 : 1999.05.23 저자 : Cai Y. and David S.K. 서지사항 : Indian Journal of Fibre and Textile Research 1998 23/2 (115-122) (6547) 등록일 : 2016.11.02 I 조회수 : 346 작성자 : |
A sequential two-stage bleaching process using peracetic acid followed by hydrogen peroxide has been developed specifically for jute and jute/cotton blend fabrics. A peracetic acid system is optimised for jute by the selection of suitable buffering and stabilising agents. A superior bleaching effect is obtained by using TSPP as a stabiliser in the presence of a phosphate buffer, under mildly alkaline conditions (pH 8.0-8.5), whereby excellent fibre brightness may be achieved at temperatures at low as 40-60℃. A conventional H₂O₂-Na₂SiO₃ system has also been further optimised for jute by the exclusive use of sodium metasilicate at high concentrations of 3.5-4.0 g/l. Seqential bleaching with these independently optimised system results in an excellent degree of overall fabric brightness, such that the 1st-stage peracetic acid bleach may be caried out at relatively low temperature (30-40℃). This combination process therefore offers an effective, environmentally favourable and energy efficient option to convoxide-utilising and chlorine bleaching processes. A further advantage is that it may also be successfully extended to the bleaching of jute/cotton blends. Furthermore, fabric tensile strength loss is less than that observed with high temperature H₂O₂-Na₂SiO₃ bleaching and the tendency towards photoyellowing of the combination bleached fabrics is not adversely affected, despite the high level of fabric brightness achieved.
|