Study On The Synthesis And Application Of INOBS For Low-temperature And High-efficiency Oxidative Bleaching

Energy saving, environmental protection, and high efficiency are the sustainable development directions of dyeing and finishing industry in the 21st century. The energy consumption and pollution in textile pre-treatment are the most prominent problems in dyeing and finishing process. Thus, it is imperative to develop environment-friendly, low-temperature and high-performance agent for pre-treatment innovation. Hydrogen peroxide bleaching process without AOX pollution were more and more widely used in textile bleaching because of its excellent bleaching effect and wide applicability. However, the conventional hydrogen peroxide bleaching process was usually close to boiling point, which consumes much energy and easily results in excessive damage of fibers. Especially for multi-component fabrics, conventional hydrogen peroxide bleaching may easily lead to serious damage for one component and poor whiteness for another component. According to the problems of hydrogen peroxide bleaching technology, in this paper, environmentally friendly hydrogen peroxide bleaching activator was developed and low-temperature bleaching process for cotton yarn and fabric was optimized,which was significant to overcome difficulties in cotton fabric bleaching and achieve energy-saving in dyeing and finishing industry.In this paper, the synthesis process of INOBS, an activator of hydrogen peroxide bleaching, was optimized by comparing different factors on yield .The structure and yield of INOBS were analyzed by FTIR and HPLC. The optimal synthesis process is as follows: isononanoic acid and thionyl chloride reflowed at at 35℃for 2h with molar ration 1.3:1. After atmospheric distillation and vacuum distillation, the yield of isononanoyl chloride was up to 95%. Under the NaOH-Na2CO3 buffer system, isononanoyl chloride and sodium phenolsulfonate, with molar ration 1.3:1, reacted with phase transfer catalyst at room temperature for 2h to synthesize INOBS and the yield reached 76%.On the basis of INOBS development, the low temperature bleaching system of H₂O₂/INOBS was established. And the activating effect of INOBS on H₂O₂ bleaching was investigated and the mechamism was analysed. The optimal H₂O₂/INOBS activating process on cotton yarn was as follows: 6g/L 30%H₂O₂, 3g/L INOBS (the mol ratio of INOBS to H₂O₂ 1: 6) 1g/L stabilizing agent and 1g/L penetrant were mixed together at 70℃for 60min when pH was 8⁹ and the bath ratio was 1: 20. The optimal pretreatment process of H₂O₂/INOBS activating system associationg with enzyme on cotton was as follows: 8g/L 30%H₂O₂,4g/L INOBS (the mol ratio of INOBS to H₂O₂ 1:6), 1g/L stabilizing agent and 1g/L penetrant were mixed together at 80℃for 60min with bath ratio 1: 20 when pH 9. The results show that, INOBS could remove some oil wax and isononanoic peracid produced by H₂O₂ and INOBS has good bleaching effect. The H₂O₂/INOBS activating bleaching technique is beneficial for saving energy and reducing pollution.Compared with NOBS,the synthesis cost of INOBS is far less than NOBS because of the lower price of isononanoic acid. Isononanoyl chloride distillation under reduced pressure was easier than nonanoyl chloride and the bleaching effect of H₂O₂/INOBS system is not less than H₂O₂/NOBS system. Thus, INOBS had practical application value in the textile bleaching.