Composite Finishing For Silk Fabrics By Nano-ZrO₂ And Low-Temperature Oxygen Plasma

Nanometer materials have a broad application prospects in developing the new textile material and improving the function of fabric,such as UV protection,infrared radiation,anti-aging,high strength,wear resistant,antistatic,anti-microbial and so on.Inorganic nano-ZrO₂ material has advantages of safety,environmental protection and good stability,was a good kind of ultraviolet absorber and far infrared radiation material,it has been valued in medical treatment and health care.It was an important direction for the developing of green functional textiles.For enhancing the silk product attachment value,the silk was treated with nano-ZrO₂ dispersion.The feasibility of silk modified with nano material was investigated,which provided theoretical base for developing functional silk with inorganic nanometer materials.The optimum preparation technology of nano-ZrO₂ dispersion system was determined.Then the dispersed state of nano-ZrO₂ was analyzed by means of the size detector and transmission electron microscope.The average diameter of nano-ZrO₂ was 95.31 nm.Silk fabrics were treated with low-temperature oxygen plasma before coordinated by nano-ZrO₂ dispersion through double-dip-double-nip.Take mechanical property,thermal stability,warmth retention property,softness,hygroscopicity and ultraviolet resistance test to the finished fabrics.The results showed that the warmth retention property,softness and ultraviolet resistance of silk fabric were improved.The breaking strength and the hygroscopicity declined slightly.The thermal stability was little changed.The factors influenced on finishing results were studied and a good finishing effect was obtained when plasma radio-frequency power at 80 W,treatment time at 5min.The plasma radio-frequency power and treatment time should be con-trolled well in the practical application in order to avoid the etching effect and damage on the surface of fabric material.In nano-ZrO₂ dispersion finishing of silk fabrics,chose nano-ZrO₂ concentration,curing temperature and curing time as influencing factors in three levels respectively and took weight gain rate,breaking strength and whiteness as evaluation index,undergoing single factor experiment and orthogonal experiment respectively.The optimized parameters of plasma-nano-ZrO₂ dispersion process of silk crease resistant finishing were:nano-ZrO₂ concentration 0.7%,curing temperature 130?,curing time 3min.Through experimental comparison of scanning electron microscopy?SEM?result among the original silk fabrics,silk fabrics treated by plasma and by plasma-nano-ZrO₂ dispersion,the analysis showed: after low-temperature plasma treatment,silk fiber's surface became rough due to the etching effect.After nano-ZrO₂ finishing of silk fabrics,nano-ZrO₂ particles were uniformly adhered to the surface of silk fibers.Fourier transformation infrared spectrum analysis?FTIR?showed that there were two new absorption peak in 750.84cm-1 and 496.56cm-1 after finishing,and the peak was characteristic peaks of inorganic nano-ZrO₂.In 1102.13cm-1,there was a new absorption peak,and the peak was characteristic peaks of-Si-O-Si-bonds which was the co-condensation reaction between silane coupling agent and Si-OH of nano-ZrO₂.And in1713.42cm-1 there was a new absorption peak,the characteristic absorption peak was C=O.So,it indicated that the cross-linking occurs between nano-ZrO₂ and silk fiber by coupling agent.X-ray diffraction?XRD?experiment was carried out between original silk fabric and fabric treated by plasma and nano-ZrO₂ dispersion.As you can see from diffraction analysis pictures,the main characteristic peak closed to the opposite diffraction angle,indicating that the aggregation structure of silk fabric occurred no fundamental changes when nano-ZrO₂ grafted.And the intensity of XRD curves of silk fabric grafted nano-ZrO₂ was slightly lower than the original one,which was due to the nano-ZrO₂ molecules penetrated into the fibers,weakening the hydrogen bonding interaction between fibroin macromolecules,destroying the well arrayed molecular chain segments,making silk fiber structure relaxation.The degree of crystallinity was reduced.While at the diffraction curve after finishing,there appeared the diffraction angles of the characteristic absorption peaks of monoclinic ZrO₂ at 28.3 ° and 31.6 °,it shown that nano-ZrO₂ deposition onto the surface of the silk fiber efficiently.With the increasing of irradiation time,the whiteness is decreasing gradually.The whiteness of the silk fabric treated by plasma and nano-ZrO₂ dispersion is high than the silk fabric treated by nano-ZrO₂ dispersion and ordinary silk fabric.So the yellowing resistance capability of silk fabric treated by plasma and nano-ZrO₂ dispersion has been enhance.