| Short pre-treatment process is reasonable reduce the traditional desizing, scouring, bleaching, dyeing four-steps processing into three steps, two-steps or even one-step processing to produce textiles. Early in 50's, studies on short process to produce textiles have reported on foreign journals, mainly focused on short pre-treatment process. The short flow process can reduce energy consumption, save costs and improve production efficiency, because of 50's cheap oil, abundant energy, lag in the relevant processing aids and equipment, this process has not been developed. As the 70's Middle East oil crisis broke out, force the western industry pay attention to energy conservation, under the background, short process began to develop rapidly.Today, short pre-treatment process is relatively mature and has put into industrial production, but the short process combine pre-treatment with dyeing has been stuck in the experimental stage, no mass production reported. Based on previous research, comprehensive analysis of pre-treatment and dyeing process, this paper try to explore a suitable short process combine pre-treatment with dyeing for cotton knitted fabrics, to make contribution to the protection of the environment within our capacity.Firstly, try producing an additive AL-1 combine scouring with bleaching in one bath. According to the request of remove impurities on the cotton fiber surface, select appropriate surfactants as AL-1 component; according to the requirements of dyeing of cotton fiber, selected peroxide hydrogen as the AL-1 bleaching composition, and silicon Sodium as appropriate hydrogen peroxide stabilizer. Based on single factor experiment, through orthogonal experiment, by analysis the experimental results, the best ratio of scouring and bleaching agent is:A-1,0.4g/ L; LAS,0.4 g/L; NaOH,1.2 g/L; Na2SiO3,2g/L; H2O2,6g/L.The application process of obtained ratio of bleaching agent AL-1 was discussed, the scouring and bleaching time and temperature were studied, by test the properties of the fabric after scouring and bleaching, obtained the best application process:bath ratio,1:20; AL-1,4g/L; temperature,90℃; preservation at 90℃for 60min.Under this process, compare other two scouring agent with AL-1 in scouring effects. After testing the pectin content of cotton fabric, the effect of AL-1 and pectinase on pectin content of the fabric was compared.By retrieving the latest Dyes Application Notes, pick out 6 dye resistant to hydrogen peroxide levels in 4 or more. The maximum absorption wavelength of dye caused by each component of the agent AL-1 was discussed; Effective dye concentration changes caused by different concentration of H2O2 and NaOH in dye solution was also studied. On the basis of above experiments, one-bath dyeing experiment was performed, and relative dyeing properties were tested, finally the right one bath dyeing process was:bleaching after dyeing and scouring process. Since the one bath dyeing process have great demanding on dyes in oxidative stability, in order to development a short process to fit for all reactive dyes, physical and chemical properties (pH, H2O2 concentration) of pre-treatment liquid was tested, catalase was selected to remove hydrogen peroxide, and optimal process was decided through orthogonal experiments. On this basis, a two-bath dyeing experiment was performed, results show that fabrics dyed by the process can reach conventional dyeing standards.Finally, to verify the application scope of the two processes, experiments on the 17 kinds of dyes in routine, bleaching process after scouring and dyeing, two-bath dyeing process, relative dyeing properties were tested. Results showed that:compared to conventional dyeing, once in a blue moon such as yellow HQ-E4R can meet the requirements of chromatic aberration produced by bleaching after scouring and dyeing process, contrast, two-bath dyeing process meet the requirements of chromatic aberration and color fastness perfectly, so the process can be applied to industrial mass production. |
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