| Ultraviolet radiation is one kind of electromagnetic wave radiation, accounting for6%of thesolar spectrum, its wavelength range from200nm to400nm. International Commission onillumination (CIE) divided it into ultra violet A, ultra violet B and ultra violet C. The moderateamounts of ultraviolet irradiation can improve immunity, prevent some disease, but too muchirradiation may cause harm to human health. The atmospheric ozone layer can absorb all UVC andpart of the UVB and UVA. Recently, as environmental pollution is becoming more and moreserious, ozone layer has been destructed, over Australia and New Zealand even appeared theozone hole. Too much irradiation has been threat to the health of local people. Clothing canprotect the skin, so it’s important to develop the UV-protective clothing.Thin knitted cotton fabrics are widely used as summer clothing fabrics because of highcomfort. The UV protection properties of thirty kinds of knitted fabrics used for summer clothingfabric were tested and analyzed. It was found that the color of the fabric had great effect on fabricUV protection properties and both the fiber type and fabric structure also had some effect onfabric UV protection properties. The fabric color was deeper, the fabric was thicker and tighter, thefabric UV protection properties were better.An undyed cotton single jersey fabric was chosen as the experimental material to be appliedUV protection finishing. Four kinds of commercially produced UV protection finishing agentswere collected, which were HC、HTUV100、UV-CS and JR-A. They were applied to the undyedcotton single jersey fabric according to the recommended conditions. The UV protectionproperties of the finished fabrics were tested and analyze. It was found that the agents HC,HTUV100and UV-CS improved the fabric UV protection properties, but the JR-A did not. In theaspect of UV transmittance, the HC had low transmittance for UVC and UVB, but was not verygood for blotting out the UVA. The HTUV100could blot out UVC, UVB and UVA. The UV-CScould blot out UVB and UVA, but it made the fabric yellow and rough. So the paper chose the HC and HTUV100in follow-up experiments.In order to get the optimized finishing condition of the agent HC, the solution concentration,dipping time, baking temperature and the solution temperature were changed separately to finishthe fabric with single factor experiment. Then the optimized finishing parameters were obtained asfollowing: the concentration of agent being6%，dipping for5min，baking for170℃and thesolution concentration being25℃. But after finishing, the UV protection properties of the fabricwasn’t good enough which didn’t meet the lowest UV protection standard of Australia/NewZealand. In the aspect of the wearing properties, the liquid transfer property and softness wereimproved after finishing, it’s moisture permeability was almost unchanged, and there was a smalldecrease in air permeability. Field Emission Scanning Electron Microscope (FESEM) was used tocharacterize the surface of the fabric. It was found that a lot of different shapes of particlesattached to the surface of fabric after finishing, but its UV protection properties wasn’t ideal，which should be due to the the poor effect of agent itself.In the process of optimizing the finishing condition of the agent HTUV100, firstly, thesolution concentration, solution temperature, dipping time and baking temperature were changedseparately to finish the fabric with single factor experiment，and then, an orthogonal test wascarried out. It was found that the optimized finishing conditions could significantly improve theUV protection properties of the fabric after finishing. By carrying out range analysis, the bestfinishing conditions were obtained respectively for getting the best UV protection properties, bestair permeability, best moisture permeability, best liquid transfer property and best softness. Thecomprehensive optimum finishing conditions were also obtained: the concentration of agent being50g/l，the solution concentration being70℃，baking for110℃. After finishing, the UPF valuereached28.96and the ultraviolet transmittance was all less than6.7%, which had reached the levelof good protection according to UV protection standard of Australia/New Zealand. In the aspect ofthe wearing properties, except a slight decrease in air permeability, the moisture permeability,liquid water transfer properties and softness were all improved. Field Emission Scanning ElectronMicroscope (FESEM) was used to characterize the surface of the fabric. It was found that therewere a lot of deposits attached to the surface of the fabric, which forms a layer of UV protectionfilm. |
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