Study On Preparation Of FTO@TiO₂ Whiskers By Microwave Solid Phase Method And Its Antistatic Performance

Research reports on conductive fillers are mainly concentrated on polymers(such as:polypyrrole,polyaniline,polyacetylene,polythiophene,etc.),carbon-based conductive materials(such as carbon powder,carbon nanotubes,etc.)and metals and Its oxides,but most of its appearance characteristics are dark green or black,which limits the application of the above-mentioned conductive fillers.Rutile TiO₂ has excellent matting properties.Using this as a substrate,a transparent conductive layer can be coated on its surface to ensure the electrical properties of the material and also have light color characteristics.At present,the preparation of TiO₂ whiskers generally has the problems of complicated process,long preparation time and short whisker length.This topic uses microwave solid-phase heating method on the basis of previous research on conductive titanium dioxide,which shortens the preparation time while shortening the preparation time.By adding a certain proportion of sodium chloride(Na Cl)as a slow-release agent,thereby increasing the length of the whiskers.And with TiO₂ whiskers as the coating matrix,a layer of fluorine-doped tin oxide transparent conductive layer is uniformly coated on the surface of the whiskers by liquid deposition method to obtain a fluorine-doped tin oxide coating with a large aspect ratio Titanium dioxide(FTO@TiO₂)conductive whiskers.Using water-based polyurethane as the slurry and FTO@TiO₂ whiskers as the conductive filler,mixed to obtain an antistatic coating,which is then coated on the polyester fabric to finally obtain an antistatic fabric.details as follows:This topic first uses nano-titanium dioxide and potassium carbonate as raw materials,while adding a certain proportion of chloride(sodium chloride and zinc chloride)as a slow-release agent for whisker growth reaction,using microwave solid-phase heating method,and then within a short time A potassium tetratitanate(K₂Ti₄O₉)whisker with a large aspect ratio was prepared.The effects of microwave calcination temperature,holding time,and chloride type and content on the formation of K₂Ti₄O₉ whiskers were studied.Thermogravimetric analysis was used to analyze the formation mechanism of K₂Ti₄O₉ whiskers by the addition of chloride.Finally,the results were obtained after acid treatment and microwave sintering.Anatase titanium dioxide whiskers,the effect of sintering parameters on the transformation of titanium dioxide crystal form was studied.The results show that when microwave sintering at 900? for 60 mins,adding 5%Na Cl as the whisker slow-release agent not only helps increase the crystallinity of K₂Ti₄O₉,but also increases the average whisker length from 3.14?m to 12.19?m;when sintering at 1000? for 90 mins,the anatase TiO₂ whiskers basically transform into rutile.At this time,the average length of the titanium dioxide whiskers is 8.58?m.Secondly,the rutile titanium dioxide whiskers prepared above are used as the coating matrix,Sn F₂ is used as the fluorine source,and Sn Cl₄·5H₂O is used as the tin source.The fluorine-doped tin oxide coated rutile titanium dioxide whiskers(FTO@TiO₂),studied the influence of various coating parameters(including fluorine doping ratio,coating ratio,coating p H,and calcination temperature)on whisker resistivity and whisker Hunter whiteness,and designed and used orthogonal experiments on the coating process After optimization,the orthogonal experiment shows that the coating p H has the most obvious effect on the electrical conductivity of the whiskers,followed by the doping ratio(fluorine-tin ratio),coating ratio(tin-titanium ratio)and calcination temperature;calcination parameters have an effect on whisker whiteness The degree of influence decreases in order:sintering temperature>fluorine-tin ratio>tin-titanium ratio>p H.The results are obtained:when the coating p H is 2,the calcination temperature is 400?,the coating ratio is30%,and the doping ratio is 10%.The resistivity is 1.002 k?·cm,and the Hunter whiteness is83.4.Under this coating parameter,the concentration of fluoride ion in the coating waste liquid is less than 5 ppm,which meets the relevant national emission standards.Energy dispersive spectrometer(EDS)and X-ray photoelectron spectroscopy(XPS)are used for doping elements of conductive whiskers.The distribution of F is tested and analyzed,and the results show that F atoms are successfully doped into the tin oxide unit cell,thus showing good electrical properties first.Finally,the FTO@TiO₂ conductive whiskers prepared above are used as fillers,mixed into the water-based polyurethane slurry according to different mass ratios,and part of the binder is added to obtain a white antistatic coating.The polyester fabric is coated to obtain Antistatic fabric,use surface resistance meter and fabric induction electrostatic tester to test the fabric antistatic(including fabric surface resistance,peak voltage and static half-life).The results show that when conductive whiskers added is 30wt%,the fabric is antistatic.The electrostatic effect has been significantly improved.The peak voltage of the fabric is stable at 30 V,and the electrostatic half-life is reduced to within 1s.At this time,the fabric has an excellent antistatic effect.In addition,the results of the washing stability of the coating show that the fabric has a certain degree of stability after washing 90 times.Antistatic performance.