Investigation On Preparation Of Superfine Fibbers For Efficiently Removing Formaldehyde

At present, there are many methods to remove formaldehyde indoor,such as physical purification method, photocatalytic purication method,oxide purification method and alternating current corona discharge plasmato remove formaldehyde. But all methods of removing formaldehyde havetheir defects. For example, the adsorption efficiency of physical adsorptionmethod is low. The photocatalytic technology needs ultraviolet rays.Thermal plasma method requires electric energy. Although oxidationmethod doesn’t have above shortcomings, the catalytic materials mostly arepowders, which is difficult to disperse in other materials. Some studiesloaded catalytic powders to glass fibers or ACF. But the link betweenpowders and fibers is very weak. Catalytic agent powders are easy to falloff and the glass fibers or ACF are difficult to molding. The present studyused oxidation catalyst MnO2nano-powders, which could catalyze anddegrade formaldehyde in room temperature, and polymer PP to prepareorganic and inorganic compound materials. Then the compound materialsare electrospun to superfine fibers using melt electrospinning method,which could get superfine fibers easily and directly. The high specificsurface area superfine fibers could increase the concentration offormaldehyde around MnO2, which could enhance the catalytic efficiencyof MnO2. Polymer fibers are flexible to molding easily. The applicationrange is wide. In order to electrospin superfine fibers, the thesis modified material to decrease the viscosity of polymer melt. Then the bestelectrospinning conditions were confirmed. Coupling agent was used toimprove the link between catalyst powders and polymer fibers to increasethe service life of formaldehyde removing fibers.In the study, high-speed camera was used to observe the phenomenonof melt electrospinning process. With different additive and differentelectrospinning conditions, the electrospinning phenomenon and fibersdiameter was different. Difference could be seen directly using high-speedcamera among the electrospinning process rather after the electrospinningusing SEM. Then the best amount of additive and electrospnningconditions were confirmed, which saves time and comsuption. In addition,the use of laboratory-made spinning nozzle could spin multi fibers at thesame time. The spinning efficiency was improved.