Preparation Of Nano-far-infrared Radiation Materials And Their Applications In Textiles

The far infrared emission materials can absorb the solar energy and the heat of humanthen emit back to the body, far infrared thermal effects play a positive effect on keepingwarm. In addition, under the far-infrared rays, the molecular energy level of the organismis excited at higher vibrational energy state，this can activate the activity of biologicalmacromolecules, complement the bio-energy, form the body metabolism and immunefunction, promote blood circulation and metabolism, eliminate fatigue and restore physicalstrength.The past10years, foreign committed to the research and application of roomtemperature white far-infrared ceramic powder, the domestic ceramic science andtechnology workers has begun research in this area and made initial progress。However, theaverage particle size of the room temperature far-infrared ceramic powder is still in themicron level and its far-infrared emissivity is low. At home and abroad,far infraredmaterials for the textile field are metal oxides, non-metallic oxides and rare earth materials,but these materials have some disadvantages, such as the cost is high, the preparationprocess is complicated and the emissivity is low, and so on。The purpose of this study is to find high radiation rate, low-cost far infrared materialsfor natural fiber。This is the prerequisite of the technology for application in the textilefield and improving surface processing technology of the far-infrared emission materials,increasing its combination with natural fiber interface, to get rid of the dependence onadhesive。The innovation of this paper is to combine sonochemistry and microemulsionmethod. The ultrasonic cavitation and micro-emulsion form many micro reactors whichprovide special environment for the formation of nucleation and crystal growth, particlesprepared by this method have good dispersion and small particle，With crystal defectchemistry knowledge, we synthesized AgI-doped ZrO₂; the synthesized powders werecharacterized by means of XRD, TG-DTA, SEM, the TEM, the XPS, the ESR,fluorescence spectroscopy. The prepared powders were modified by coupling agent to obtain a stable solution of ZrO₂. Finally, the far-infrared properties of ZrO₂solution on thecotton fabric were researched.Major research work and achievements are as follows:（1） ZrO₂nanopowders were prepared by Ultrasonic microemulsion method, when theamount of dispersant of PEG was1.5%, ultrasonic power was20kHz ultrasound for10min, the powders have the best dispersion and smallest particle size.（2） AgI doped influence ZrO₂crystal form, when the doping amount is less than1%the crystal form is tetragonal phase and the monoclinic phase began to appear when thedoping amount is more than1%, and the monoclinic phase increases with the dopingamount of AgI. When the surfactant PVP amount is2%, the nanocomposites have gooddistribution, small particle size and low agglomeration. The main ingredient of thecomposite powders are AgI and ZrO₂no other impurities generated. The oxygen defectconcentration of AgI-doped ZrO₂was increased, the band gap was broadened, impuritylevel appeared, light absorption rate was increased, the utilization of light wasimproved.（3） AgI doping has impact on the intensity of ZrO₂fluorescence, when the dopingcontent is0.5%the powders have the strongest intensity.（4） When milling time is3h, the amount of modifier is10%,the powders have finemodified effect and extending the milling time and increasing the amount of modifier haveno obvious effect. Modified ZrO₂dispersions have excellent dispersion stability, uniformparticle size.（5） Cotton fabrics which treated by ZrO₂water dispersion system have goodfar-infrared emissivity; Far infrared emission rate has been further improved by AgI doping.Cotton fabrics which treated by ZrO₂water dispersion system still have good far-infraredemissivity after washed20times.