High-temperature-resistant high-filtration composite fiber membrane and preparation method thereof

A composite fiber membrane, high temperature resistant technology, applied in the direction of separation method, filtration separation, membrane filter, etc., to achieve the effect of improving electrostatic filtration performance, long service life, and convenient large-scale application

Active Publication Date: 2022-06-24
WUHAN TEXTILE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has high filtration efficiency and high temperature resistance, but only relies on the pore structure of the fiber mesh to achieve high filtration performance, at the cost of high wind resistance

Method used

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  • High-temperature-resistant high-filtration composite fiber membrane and preparation method thereof
  • High-temperature-resistant high-filtration composite fiber membrane and preparation method thereof
  • High-temperature-resistant high-filtration composite fiber membrane and preparation method thereof

Examples

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Effect test

preparation example Construction

[0027] A preparation method of a high temperature resistant and high filtration composite fiber membrane provided by the invention comprises the following steps:

[0028] S1. respectively prepare a polyamic acid spinning solution and a polyacrylonitrile spinning solution, and the polyamic acid spinning solution is added with tourmaline; by adding tourmaline to the polyamic acid spinning solution, on the one hand, using The self-generating polarity of tourmaline improves the subsequent charge storage performance; on the other hand, the high dielectric constant of tourmaline is used to increase the dielectric constant difference between polyimide fibers and polyacrylonitrile fibers to improve triboelectric charging. performance.

[0029] S2. The polyamic acid spinning solution and the polyacrylonitrile spinning solution are synchronously or alternately centrifuged and deposited to obtain a composite fiber membrane; the rotational speed of the centrifugal spinning is 2000-5000 rp...

Embodiment 1

[0044] A preparation method of a high temperature resistant and high filtration composite fiber membrane, comprising the following steps:

[0045] S1. the preparation of spinning solution: adding tourmaline powder and antibacterial agent to the polyamic acid solution, mixing uniformly to obtain polyamic acid spinning solution (wherein, the contents of tourmaline powder, antibacterial agent and polyamic acid are respectively 5wt%, 3wt% %, 20wt%), adding polyacrylonitrile to N,N-dimethylformamide, and mixing evenly to obtain 22wt% polyacrylonitrile spinning solution;

[0046] S2. Preparation of polyamic acid / polyacrylonitrile composite fiber membrane: Pour the polyamic acid spinning solution and polyacrylonitrile spinning solution prepared in step S1 into a spinner with at least two holding chambers for synchronous centrifugal spinning silk to obtain a composite fiber membrane, wherein the average fiber diameter is 0.4-5 μm;

[0047] S3. Imidization of the polyamic acid / polyacr...

Embodiment 2-5

[0049] A preparation method of a high temperature resistant and high filtration composite fiber membrane, compared with Example 1, the difference is that the average fiber diameter and the thickness of the composite fiber membrane are shown in Table 1, and the others are roughly the same as Example 1, here No longer.

[0050] The test results of table 1 embodiment 1-5

[0051]

[0052] As can be seen from Table 1, the present invention can achieve a filtration efficiency of 99.5% without electret treatment, and the filtration resistance is lower than 80Pa. After being placed for 6 months, the filtration efficiency can still reach 99.1%, indicating the service life of electrostatic filtration. It can achieve long-term and high-efficiency filtration performance through self-friction electrification, which is of great significance for filtration in high temperature environments. When the thickness of the fiber membrane is the same, the smaller the fiber diameter, the higher t...

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Abstract

The invention provides a high-temperature-resistant high-filtration composite fiber membrane and a preparation method thereof. The method comprises the following steps: S1, respectively preparing a polyamide acid spinning solution and a polyacrylonitrile spinning solution, wherein tourmaline is added into the polyamide acid spinning solution; s2, carrying out synchronous or alternate centrifugal spinning deposition on the polyamide acid spinning solution and the polyacrylonitrile spinning solution to obtain a composite fiber membrane; and S3, carrying out imidization treatment on the composite fiber membrane to obtain the high-temperature-resistant high-filtration composite fiber membrane. The high-temperature-resistant and high-filtration composite fiber membrane is obtained through centrifugal spinning one-step forming, friction self-charging is achieved, meanwhile, a small amount of tourmaline powder is added into polyimide, the electrostatic filtration performance is improved, the filtration resistance is reduced, viruses and dust particles can be captured through the electrostatic force effect of charges, and the anti-static effect is achieved. And the filtration effect of the fiber membrane is better due to irregular arrangement of the micro-nano fibers. The process is simple and convenient for large-scale production.

Description

technical field [0001] The invention relates to the technical field of filter material preparation, in particular to a high temperature resistant and high filtration composite fiber membrane and a preparation method thereof. Background technique [0002] In order to solve the growing problem of air pollution, many polymers or mixtures are prepared into fibrous membranes to filter various components in air pollutants. Gas pollutants are removed by adsorption, filtration, catalysis, etc. to achieve the effect of gas filtration. For example, the electrostatic adsorption layer in the mask uses the electret principle to capture dust particles through the electrostatic effect of electric charges, thereby filtering virus-carrying droplets and particulate matter in the air. However, in the prior art, the electret filter material mostly uses polypropylene melt-blown non-woven fabric as the base material. Although the electrostatic adsorption filtering effect is better, it cannot be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D69/02B01D39/14B01D46/00B01D46/54
CPCB01D67/0079B01D69/02B01D69/12B01D39/14B01D46/0001B01D46/0032B01D46/543B01D46/546B01D2325/40B01D2239/0636
Inventor 刘欣李星周应山夏良君夏治刚徐卫林张春华尚斌
Owner WUHAN TEXTILE UNIV
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