| Air pollution has attracted more and more attention,and source treatment and terminal filtration are two ways to deal with such problems.However,source control requires long-term in-depth research on the formation mechanism and control measures of such problems,and it is difficult to achieve significant results in a short period of time.Therefore,terminal air filtration is currently the most effective way to deal with air pollution problems.Fiber air filter materials are widely used in personal protection,indoor purification and other fields.However,due to the simple structure of traditional fiber filter materials,there is a common problem that it is difficult to improve the performance of filtration resistance and filtration efficiency at the same time.In addition,traditional air filter materials can only filter particulate matter,and bacteria,viruses and other microorganisms remaining in the fibers after being filtered may be released under certain conditions,causing secondary harm to the human body.Therefore,the development of materials with high filtration efficiency and low filtration resistance is an important development direction in the field of air filtration,and filter materials with antibacterial functions are more in line with the needs of human health.In view of the urgent demand for high-efficiency and low-resistance filter materials under the current background,this topic focuses on the technical problems of the existing structural defects of fiber-type air filter materials.Polyamide 6(PA6)and chitosan(CS)are used as raw materials,based on Using jet spinning technology,nanometer antibacterial fiber membranes with high filtration efficiency and low filtration resistance were prepared.Combined with supramolecular self-assembly technology,using the properties of 3,4-dimethyldibenzylidene sorbitol(DMDBS)small-molecule organogels,the self-assembly of supramolecular nanowires was carried out inside PA6/CS solution-jet nanofibers.Assembled and grown to prepare a high-efficiency,low-resistance,multi-stage air filter material with bulk antibacterial properties.This topic specifically explores the process of PA6/CS solution jet spinning,studies the control relationship of spinning conditions on the structure of the fiber web,and summarizes the appropriate process parameters of PA6/CS in solution jet spinning.The forming mechanism of PA6/CS bicomponent nanofiber webs was analyzed,the self-assembly behavior of small molecular organogelators on the liquid-jet fiber webs was explored,and the properties of the prepared fiber webs were tested.The results show that the PA6/CS nanofiber webs prepared by the solution jet method have a three-dimensional crimped structure,and more cavity structures are formed between the fibers,which provides space for the construction of multi-level nanofiber webs.Aiming at the formation and growth process of supramolecular nanowires,this study proposes a self-assembly mechanism of adsorption-nucleation-growth.Through the adjustment of the spinning process and self-assembly conditions,the preliminary control of the structure of the solution-jetted nanofibrous network and the self-assembled secondary nanonetwork was achieved.The performance test of the multi-level nanofiber web showed that the DMDBS small molecule organogelling factor was successfully self-assembled in the solution jet-spun PA6/CS nanofiber web to form a multi-level nanofiber web,the filtration efficiency of the multi-level nanofiber web for PM 0.3 It can reach 99.992%,the resistance pressure drop is 55 Pa,the initial modulus is 7.82 Mpa,the moisture permeability reaches183.1482 g/m~2h,and it exhibits more than 99.99%antibacterial properties against Staphylococcus aureus and Escherichia coli.It has practical significance for solving the limitations of traditional air filter materials such as low efficiency,large filtration resistance,and poor bacteriostatic effect.It has certain commercial application value in the fields of personal protection,indoor purification and industrial filtration. |
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