In-situ High Voltage Electrostatic Assisted Meltblown Ultrafine Fiber Preparation And Performance Research

In the last few years,dust and haze weather?continuous consumption acceleration of fossil fuel and deteriorating air environment happend so often,threating to the world's environment and the safety of human life are threatened by air pollution.In individual protection air filter material plays an important role.Meltblown nonwovens have always occupied a leading position in personal protection air filter materials with their unique advantages such as high specific surface area,low cost,high production efficiency,high efficiency and low resistance.However,the meltblown nonwovens still has variety problems,such as difficult to improve filtration efficiency,thicker fiber diameter,wide diameter distribution range,electret effect to be improved,and complicated adjustment of processing parameters.These factors retard the application scope and promotion of meltblown nonwovens to an extent.Regarding present problems,this paper proposes an in-situ high-voltage electrostatic assisted melt-blowing technology.The hollow electrode plate is installed at the front of the melt-blowing die,and the perforated plate is installed behind the roller blind mesh bag.The two levels high-voltage electric field is used to provide the electrostatic force performs electrostatic drawing and refinement of the polymer jet in the molten state to realize the preparation of melt-blown fibers,the high electric field induces the dipole moments of the polar molecules in the polypropylene to align regularly to form polar electric charges at high temperatures.Physical interception and electrostatic adsorption improve the efficiency of meltblown nonwoven filtration and interception.The main research contents are as follows:(1)Two-stage electrostatic auxiliary melt blown device was designed.The in-situ high-voltage electrostatic auxiliary melt-blowing device was designed in detail,and the influence of the hollow width and inclination angle of the hollow electrode plate on the field strength distribution in the electric field was explored through the simulation analysis method,and through the slit-type melt differential electrospinning device.The effect of the hollow electrode plate on the spinning process was explored,and the effective stretchability of the hollow electrode plate on the polymer jet was verified.When the hollow width is 30mm,the spinning jet is the largest and the fiber diameter is the smallest.(2)The effect of electrostatic assisted meltblowing on the physical properties of fiber membranes was explored.Using the modified 600mm width electrostatic assisted meltblown production line,through experiments,the application of different voltages on the first-level hollow electrode plate,the first-level porous electrode plate,and the two levels electrode plate on the fineness,morphology and mechanics of the meltblown fiber membrane monofilament performance impact.(3)The effect of electrostatic assisted melt blowing on the filtration performance of fiber membranes was explored.Using the modified 600mm width electrostatic assisted meltblown production line,the effects of different voltages applied to the first-level hollow electrode plate,the first-level porous electrode plate,and the two levels electrode plate on the filtration performance and air permeability of the meltblown fiber membrane were explored through experiments.Electrostatically assisted melt-blown fiber membrane is used for corona electret,and the highest filtration efficiency of fiber membrane is obtained.In summary,this paper proposes an in-situ high-voltage electrostatic assisted melt-blown process to prepare melt-blown non-woven fibers with lower fiber diameter and higher filtration efficiency,which is conducive to promoting melt-blown non-woven materials to ultra-fine and high-filtration development in terms of efficiency.