Polyimide super air filter disc and preparation method thereof

A technology of polyimide and air filtration, applied in separation methods, chemical instruments and methods, dispersed particle filtration, etc., can solve problems such as thermal stability, mechanical properties to be improved, no parameter index, simple structure, etc., and achieve excellent Effect of Thermal Stability and Mechanical Properties

Inactive Publication Date: 2020-07-10
JIANGXI XIAN CAI NANOFIBERS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the core component of anti-smog masks and air filters, the air filter structure is usually too simple because there is no uniform parameter index, and most of them use a single non-woven fabric, gauze, plastic mesh and other materials It is prepared by multi-layer lamination, and its weaving or mesh holes are large, which can only block some large particles of suspended matter and smoke, and has a limited blocking effect on PM2. Bacteria and viruses are also difficult to achieve a good isolation and filtration effect
Moreover, since most of the existing filter materials are conventional polyolefin materials, their thermal stability and mechanical properties all need to be improved.

Method used

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  • Polyimide super air filter disc and preparation method thereof

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preparation example Construction

[0038]The preparation process of the air filter: three groups of electrospinning heads are arranged on a line in sequence, the first group has three heads, the mass concentration of the polyamic acid spinning solution is about 20%, and the absolute viscosity is 3.0-8.0Pa.S; The two ends of the second group, the mass concentration of polyamic acid spinning solution is about 12%, and the absolute viscosity is 1.8-3.0Pa.S; the third group is one head, the mass concentration of polyamic acid spinning solution is about 6%, and the absolute viscosity is 0.6-1.4. The polyamic acid superfine fibers or nanofibers formed by electrospinning are layered and dropped on the steel conveyor belt in sequence to form a three-layer composite nonwoven fabric with different fiber diameters. Formed into a polyimide super air filter. The plane size of the filter is 120*150~200*250cm 2 .

[0039] In some embodiments, the mass concentration of the polyamic acid solution in the first group of electro...

Embodiment 1

[0045] Embodiment 1: as figure 1 As shown, the present embodiment provides a polyimide super air filter, which includes a three-layer fiber composite structure, wherein the thickness of the first layer is 25 μm, and its fiber diameter is 3 μm; the thickness of the second layer is 8 μm, and its fiber The diameter is 0.8 μm; the thickness of the third layer is 1.5 μm, and its fiber diameter is 0.1 μm.

[0046] The preparation method of the above-mentioned polyimide super filter sheet comprises the steps of: dissolving equimolar benzophenone dianhydride and benzimidazole biphenylenediamine in DMF to prepare polyamic acid solutions of different mass concentrations; Three groups of electrospinning heads are arranged on a line in sequence, the first group of three heads, the mass concentration of polyamic acid spinning solution is about 20%, and the absolute viscosity is 5.0Pa.S; the second group of two heads, polyamic acid spinning The mass concentration of the polyamic acid spinn...

Embodiment 2

[0048] Embodiment 2: as figure 1 As shown, the present embodiment provides a polyimide super air filter, which includes a three-layer fiber composite structure, wherein the thickness of the first layer is 30 μm, and its fiber diameter is 2.5 μm; the thickness of the second layer is 8 μm, and its The fiber diameter is 1.0 μm; the thickness of the third layer is 2.0 μm, and its fiber diameter is 0.1 μm.

[0049] The preparation method of the above-mentioned polyimide super filter sheet comprises the steps of: dissolving equimolar triphenylene diethers dianhydride and bisphenol A type diamine in DMF to prepare polyamic acid solutions of different mass concentrations; Three groups of electrospinning heads are arranged on a line in sequence, the first group of three heads, the mass concentration of polyamic acid spinning solution is about 20%, and the absolute viscosity is 4.5Pa.S; the second group of two heads, polyamic acid spinning The mass concentration of the polyamic acid sp...

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Abstract

The invention relates to the field of high polymer materials, in particular to a polyimide super air filter disc and a preparation method thereof. The polyimide super air filter disc comprises three fiber composite structures, wherein the thickness of a first layer is 5-10mu m, and the fiber diameter of the first layer is 1-5 [mu] m; the thickness of a second layer is 5-10mu m, the fiber diameterof the second layer is 0.5-1.0 mu m, the thickness of a third layer of the polyimide super air filter is 0.5-3mu m, and the fiber diameter of the third layer is 0.05-0.5 mu m. The polyimide super airfilter disc has excellent thermal stability and mechanical properties, and the specific thermal decomposition temperature is higher than 500 DEG C; steaming and boiling with water are resisted; ultraviolet radiation is resisted; highly insulating is achieved; static electricity is charged (the static voltage is greater than 2000 volts); the porosity is greater than 90%; the average pore diameter of the functional layer is smaller than 0.3 micron, and the pressure difference at the air velocity of 85 L / min is smaller than 250 Pa. In addition, the interception rate of the air filtering efficiency of the super air filter disc on particles with the particle size of 0.3 micron or above is larger than 99.9%, and the filtering effect of the super air filter disc on particles with the particle size of 0.3 micron is far better than that of an N95 mask on particles with the particle size of 0.3 micron by 95%.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polyimide super air filter. Background technique [0002] PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 microns in the atmosphere, also known as particulate matter that can enter the lungs. After being inhaled into the human body, it will directly enter the bronchi, interfere with the gas exchange in the lungs, and at the same time, it will become a carrier of viruses and bacteria. Cause respiratory and cardiovascular diseases and other diseases. With the aggravation of urban air pollution, smog weather is gradually increasing. If no protective measures are taken, a variety of pollutants will be inhaled, which will endanger people's health. Based on this, anti-smog masks and air filters have become necessary supplies for people to deal with air pollution. [0003] As the core component of anti-smog masks and air filters, the air filter structure...

Claims

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Application Information

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IPC IPC(8): B01D46/10D04H1/728D04H1/4334A41D13/11A41D31/06A41D31/24A41D31/04
CPCA41D13/11A41D31/04A41D31/06A41D31/24B01D46/10D04H1/4334D04H1/728
Inventor侯豪情程楚云王琦张奉锐侯翔宇吕晓义
OwnerJIANGXI XIAN CAI NANOFIBERS TECH