PVDF nano fiber multifunctional air filtering material and preparation method thereof

Abstract

The invention discloses a PVDF nano fiber multifunctional air filtering material which comprises a polypropylene micrometer fiber layer and a PVDF nano fiber layer, wherein the PVDF nano fiber is prepared from a spinning solution; the spinning solution comprises the following components in parts by weight: 1 part of PVDF resin and 9-13 parts of a mixed solvent; the mixed solvent comprises an amide solvent and ketone; the preparation method for the material comprises the following steps: 1) adopting the polypropylene micrometer fiber layer as a substrate; 2) stirring and mixing the PVDF resin, the mixed solvent and tetrabutyl ammonium perchlorate, and adding the obtained spinning solution into an electrostatic spinning device; 3) performing bowl hot-pressing on the substrate through a high-temperature calender, and feeding into the electrostatic spinning device for spraying; 4) obtaining a finished product after the spraying is completed. The PVDF nano fiber multifunctional air filtering material can effectively inhibit growth of bacteria, can greatly reduce the content of oily granules and ionic granules, and is long in service life and high in production efficiency.

Description

technical field [0001] The invention relates to the field of filter materials, in particular to a PVDF nanofiber multifunctional air filter material and a preparation method thereof. Background technique [0002] At present, the global environment is deteriorating day by day, especially the air environment that is closely related to human beings, which has seriously endangered human health. At the same time, some key parts of modern high-tech have extremely high requirements for environmental purification. Therefore, modern society has a great demand for air filter materials with the advantages of high efficiency, low resistance, and antibacterial, and technologies such as nanofibers, glass fibers, and electrets have been widely used. [0003] There are many nano-filter materials, which have a single function and a relatively limited scope of application. Many filter materials have high resistance to airflow. Secondly, various antibacterial filter materials contain metal-co...

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Problems solved by technology

[0003] There are many nano-filter materials, which have a single function and a relatively limited scope of application. Many filter materials have high resistance to airflow. Secondly, various antibacterial filter materials contain metal-containing inhibitors such as nano-scale silver ions. Bacterial agents, according to the latest research, metal nanopowder is an inhalable carcinogen, and its use has been restricted in many countries in Europe and the United States; there are also nanofiber filter materials that are produced with high-boiling solvents at the same time, and the result is high-boiling The solvent cannot be completely volatilized, and the nanofiber membrane made contains residual solvent, which will cause harm to the human body, and the fiber membrane made according to the patented technology has no antibacterial effect; the electret filtration efficiency also has obvious defects, and the electret With the increase of temperature, the delay of time, and the increase of ionic water vapor in the air, the charge in the electret will drop sharply, and its adsorption capacity for particulate matter in the air will drop sharply, resulting in a decrease in filtration performance. A sharp decline

For example, in the patent CN103774345A, there is no mention of the particle size standard of the test aerosol, and the pressure drop of 28mmH2O is too high, which is not suitable for commonly used filter materials such as masks.

[0004] So far, the industrial production of nanofibers has been facing many problems, so the performance of the above-mentioned nanofiber filter materials is only limited to the performance of the nanofiber membranes prepared under laboratory conditions.

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