Study On The Nano Inorganic Antibacterial Finishing Of The Cotton Fabric

The paper reviews the meaning of the antibacterial fabric brieflyand introduces the progress on the research of inorganic antibacterial.According to analyzing the antibacterial mechanism of the nanopower,nano TiO₂ (Anatase) and nano SiO₂-Ag have been selected as theantibacterial agents. As the water will be the medium of the finishing,the distilled water has been chosen to be the dispersed phase. Then Idid some subsiding experiments andζpotential testing to discuss thedispersing activity of the nanopowder in the distilled water. Thenultrasonic vibration and PH value's effect on the nano particle wasbeen found. According to the nano powder's dispersing mechanism andtheory in the water medium and the subsiding experiments, the(NaPO₃) ₆ has been chosen as the dispersant. On the basis of havingstudied the dispersant's effect on the surface electronic nature of nanopowder by the way ofζpotential, the influence of dispersant agent andpH value to the stabilization of dispersion system was discussed. So thedispersing flow of antibacterial finishing is determined primarily. Laser Size Analyzer has been applied to show the good dispersingperformance of the nano suspended liquid.Given that the dispersants selected can make TiO₂ and SiO₂-Aghave the similar electric nature on the surface and similar dispersionflow, I tried to mix those two so as to obtain better antibacterialperformance. In the view of this the antibacterial rate was used as theindex to make orthogonal experiments of the mixing rate of nanopowder, the dose of the dispersant and the pH value of the suspendedliquid to determine the best mixing formula which can make thefinished cotton textile with the fine antibacterial performance both onE.coli and MSSA. The optimum results are shown as follows: themixing rate of (SiO₂-Ag:TiO₂) is 70:30, the dose of the dispersant is0．15% and the pH value is 8．5．The suspended powder's gooddispersing performance on the cotton fabric is shown by SEM. Theantibacterial rate of the finished fabric is shown as follows: theanti-E.coli rate is 100% and the anti-MSSA rate is 96．1% in 5 min.The functional finishing fabrics should not only have the fineantibacterial performance but also have fine wash durability andwearability. After having analyzed the performance of the bond, softagent and their ways of combining with the cotton textile, FWT hasbeen chosen as the bond and amin-silance as the soft agent. Accordingto the subsiding experiments, I was sure that there was no influence to the dispersion of nano powder. Using the ZBD whiteness and strainrate as the index to make orthogonal experiments of the dose of FWT,the soft agent and the infiltration dosage to determine the best mixingformula. The optimum results are shown as follows: the dose of FWTis 20g, the dose of soft agent is 0．5g and the infiltration is 0．3g in 300gsolutions. The antibacterial rate of the finished fabric after 10 timeswash cycle according to the GB8629-88 is shown as follows: theanti-E.coli rate is 99．89% and the anti-MSSA rate is 80．7%. It isobvious that the result is better than the 26% which is the standard inthe GB8629-88．After treating the cotton fabric with the optimum finishing, Icarried out the performance comparison experiments of the finishedand unfinished fabric, including the tearing and break tenacity, wrinklecrease recovery angle, ZBD whiteness, water vapour permeability, airpermeability and so on. The numerical value of the significant testingafter finishing showed a little change in the performance of cottonfabric. The average maintaining rate of warp tenacity is 87．8% and theweft tenacity is 89．7%. The wrinkle crease recovery angle increased.The ZBD whiteness of warp direction reduced by 3．1% and weft by3．4%. The average air permeability is reduced by 13．4%, and theaverage water vapor transmission is reduced by 8．15%. The resultrepresents that the antibacterial finishing has little effect on the wearability of the fabric.Xu Jum (Textile Engineering)Supvervised by Professor Zhu Sukang...