Polyimide/polyurethane aerogel film air filtering material as well as preparation and application thereof

An air filter material and polyimide technology, which is applied in the field of air filter material preparation, can solve the problems of poor filtering stability, large diameter and pore size, increased piezoresistance, etc., and achieves good application prospects, good mechanical properties, and simple preparation method. Effect

Active Publication Date: 2022-03-15
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary nonwoven fibers have large diameters and large pores, which makes it difficult to ensure filtration efficiency; melt-blown electret fibers rely on Coulomb force to electrostatically adsorb particles, which can improve filtration efficiency without increasing pressure resistance, but their electret effect is easy to attenuate. Poor stability: ultra-fine glass fiber has a dense structure and high filtration efficiency, but at the same time, the dense stacking structure also causes an increase in piezoresistance

Method used

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  • Polyimide/polyurethane aerogel film air filtering material as well as preparation and application thereof
  • Polyimide/polyurethane aerogel film air filtering material as well as preparation and application thereof

Examples

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preparation example Construction

[0023] In view of this, in a kind of embodiment of the present invention, a kind of preparation method of PI / TPU airgel film is provided, comprises the steps:

[0024] S1: Use diamine and dianhydride as the precursor to react, add dehydrating agent and catalyst, add TPU and crosslinking agent, select reducing solvent, and prepare PI / TPU wet gel in square glass mold by sol-gel method.

[0025] S2: The wet gel was subjected to CO after aging 2 Supercritical drying to obtain PI / TPU composite airgel film.

[0026] in,

[0027] The diamine and dianhydride used in step S1 are respectively 4,4-diaminodiphenyl ether (ODA) and biphenyltetracarboxylic dianhydride (BPDA);

[0028] The cross-linking agent used in step S1 is 1,3,5-benzenetricarboxylic acid chloride (BTC);

[0029] The reducing solvent used in step S1 is N-methylpyrrolidone;

[0030] The square glass mold used in step S1 has a side length of 20 cm and a height of 2.5 cm.

[0031] The aging condition in step S2 is:

[...

Embodiment 1

[0040] 1) Preparation of PI / TPU airgel film

[0041] Under stirring conditions, dissolve 0.6323g of ODA in 15ml of NMP, put it into an ice-water bath after completely dissolving, add 0.9585g of BPDA, and obtain solution A after it is completely dissolved, and dissolve 0.5g of TPU in 5ml of NMP to obtain solution B, Dissolve 0.0143g of BTC in 3.2ml of NMP to obtain solution C, add 2.46ml of acetic anhydride and 2.1ml of pyridine to solution A, then add solution B and solution C to solution A in turn, stir for about 5 minutes and pour into a square glass mold , shake the mold to cover it evenly, seal it with plastic wrap, and get PI / TPU wet gel in about ten minutes.

[0042] After an interval of eight hours, pour aging solution 1 (25% ethanol + 75% NMP), and after one day of solvent replacement, pour out aging solution 1, pour aging solution 2 (25% NMP + 75% ethanol), and pour it out after one day Pour aging solution 2 into aging solution 3 (ethanol), and change the ethanol onc...

Embodiment 2

[0046] 1) Preparation of PI / TPU airgel film

[0047]Under stirring conditions, dissolve 0.843g of ODA in 15ml of NMP, put it into an ice-water bath after completely dissolving, add 1.278g of BPDA, and obtain solution A after it is completely dissolved, and dissolve 0.212g of TPU in 5ml of NMP to obtain solution B, Dissolve 0.019g of BTC in 4.269ml of NMP to obtain solution C, add 3.28ml of acetic anhydride and 2.8ml of pyridine to solution A, then add solution B and solution C to solution A in turn, stir for about 5 minutes and pour into a square glass mold , shake the mold to cover it evenly, seal it with plastic wrap, and get PI / TPU wet gel in about ten minutes.

[0048] After an interval of eight hours, pour aging solution 1 (25% ethanol + 75% NMP), and after one day of solvent replacement, pour out aging solution 1, pour aging solution 2 (25% NMP + 75% ethanol), and pour it out after one day Pour aging solution 2 into aging solution 3 (ethanol), and change the ethanol onc...

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Abstract

The invention belongs to the field of preparation of air filtering materials, relates to a polyimide / polyurethane aerogel film air filtering material as well as preparation and application thereof, and particularly discloses a PI / TPU aerogel film with mesopores and macropores in a certain proportion, which is obtained by introducing polyurethane (TPU) to adjust a pore structure during preparation of PI aerogel. The filter material has the advantages of high filter efficiency, low piezoresistance and high quality factor, is relatively simple to prepare, and has a good industrial prospect.

Description

technical field [0001] The invention belongs to the field of air filter material preparation, in particular to the preparation of polyimide (PI) / polyurethane (TPU) airgel film and its air filter performance. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] "Filtration", as the name implies, makes the fluid "pass" the medium and "filter", that is, separate the solid and the fluid by adding another medium material in the fluid movement path. When the fluid is gas, it is an air filter, and the medium material in the middle is the air filter material. At present, there are two typical air filter materials, one is porous materials sieved by size, such as activated carbon, poro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J5/18C08L79/08C08L75/04B01D39/16B01D46/54
CPCC08J9/28C08J5/18B01D39/16B01D46/543C08J2379/08C08J2475/04B01D2239/10
Inventor 伊希斌聂义昊赵新富张晶于诗摩袁志鹏刘思佳沈晓冬
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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