Application Research On Nano-ZnO In Dyeing And Finishing Industry

The application of nano-ZnO has attracted much attention due to its unique UVshielding, photocatalytic degradation properties and special characteristics ofnanomaterials. In recent years, nano-ZnO has been taken as an important multi-functionalmaterial in environmental engineering, physical chemistry, photoelectricity, and materialsscience. And it is of great importance both for theoretical research and practical application.With the development of living standards, environment-friendly and multifunctionaltextiles have been the concerns of consumers. Therefore, a systematical applicationresearch on nano-ZnO in dyeing and finishing was carried out in this paper in which lightstability of dyes, light fastness of dyed cotton/silk fabrics of nano-ZnO and UV-protectionof finished cotton fabrics was included.In this thesis, the dispersion property of ZnO nanopowder was studied firstly,combining physical and chemical method with the assist of ultrasonic. The dispersionstability of dispersed solution was characterized by sedimentation volume experiment andthe dispersion property of nano-ZnO was characterized by Laser Size Analyzer. Theinfluence of dispersion method, dispersant’s category, amount and pH value of solution tothe dispersion property of nano-ZnO was discussed respectively. The optimum process ofdispersion took place when the pH value of dispersed solution was9～10and the amountof PAA-Na was1g/L. It was found that PAA-Na had better dispersion property than otherdispersants.Light stability of Tea polyphenol dyes, rubican, berberine, reactive red3BSN,reactive yellow3RS and reactive X-BR with nano-ZnO suspension was investigated viasimulated sunlight irradiation and the light stability was characterized by UV-visibleabsorption spectroscopy in this article. The effects on light stability of reactive dyes withnano-ZnO and light fastness of cotton fabrics dyed by reactive dyes were alsosystematically discussed under simulated sunlight irradiation. The effects of variousparameters such as finishing method, baking temperature, concentration of crosslinking agent and concentration of nano-ZnO were discussed in detail. The results demonstratedthat the decolorization ability of rubican and reactive blue X-BR in the presence ofnano-ZnO are stronger than that of other dyes, which represented that nano-ZnO has betterability of decolorization of anthraquinone dyes.The application of dyeing on silk fabrics was studied systematicly, and the dyeingbehaviour, UV protection properties and light fastness of dyed silk fabrics usingnano-ZnO as mordant were examined in order to discuss the effects of ZnO nanoparticals.Through the analysis of different parameters such as nano oxide species, mordant dyeingmethods and the amount of nano-ZnO, the best dyeing process of silk with natural dyeswas found in the experiment. The results showed that the dyeing behaviour of Teapolyphenol dyes was improved significantly and had little influence on light fastness ofdyed silk fabrics.Functional finishing of UV-protection for cotton fabrics using ZnO nanoparticlesthrough theconventional pad-dry-cure method was done finally in this paper. The effects ofconcentration of zinc oxide nanoparticles and concentration of adhesive were investigated.In addtion, the effect of curing temperature and curing time were also considered with theaid of variances statistical experimental designs. The recorded data showed thatUV-protection properties of treated cotton fabrics had a significant improvement. Thewhiteness and mechanical properties expressed as breaking strength and breakingelongation increased, while the moisture and air permeability properties decreased slightlyafter finishing treatment.