Preparation method of high-transmittance antibacterial polyimide/chitosan composite nanofiber air filtering membrane as well as product and application thereof

A technology of composite nanofibers and nanofiber membranes, applied in separation methods, semi-permeable membrane separation, climate change adaptation, etc., can solve the problems of affecting antibacterial performance and reducing the effective content of chitosan, so as to improve antibacterial performance and reduce The effect of perfect dosage and preparation method

Active Publication Date: 2021-12-03
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

A higher proportion of polyethylene oxide added will lead to a reduction in the effective content of chitosan in the air filter material, thereby affecting the antibacterial performance of the material

Method used

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  • Preparation method of high-transmittance antibacterial polyimide/chitosan composite nanofiber air filtering membrane as well as product and application thereof
  • Preparation method of high-transmittance antibacterial polyimide/chitosan composite nanofiber air filtering membrane as well as product and application thereof
  • Preparation method of high-transmittance antibacterial polyimide/chitosan composite nanofiber air filtering membrane as well as product and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Chitosan modification

[0035] Dissolve 2g of chitosan in 100ml of 0.5mol / L acetic acid solution, adjust the pH of the solution to 7.0, and after the temperature is adjusted to 40°C, add 0.2g of compound enzyme 1 (cellulase and lysozyme according to the mass ratio of 1:1), The reaction was shaken for 2 hours, and finally the solution was subjected to enzyme inactivation treatment to obtain a modified chitosan solution.

[0036] (2) Synthesis of polyimide / chitosan composite nanofibrous membrane

[0037] Take by weighing 36.99g dimethylacetamide (DMAc) and place in the flask, weigh 4,4'-diaminodiphenyl ether (ODA) 3.3375g respectively, pyromellitic dianhydride (PMDA) 3.708g, and ODA was put into a three-neck bottle. Fix the flask containing ODA, start the mechanical stirrer, and stir mechanically for 15 minutes to completely dissolve the monomer. Add PMDA to the flask in 10 times, and the amount added decreases as the number of times increases, and the next time is...

experiment example 1

[0055] Composite enzyme 1 (cellulase and lysozyme according to mass ratio 1:1) in embodiment 1 is replaced with papain, cellulase, lysozyme, pepsin, composite enzyme 2 (cellulase and papain according to quality Ratio 1:1), the amount of enzyme added remains unchanged, and the rest of the operations are the same as in Example 1 to prepare polyimide / chitosan composite nanofiber membranes. Afterwards, the antibacterial test and spinnability test were carried out, and the results are shown in Table 4. It can be seen from Table 4 that the chitosan was modified using the composite enzyme of cellulase and lysozyme, so that its electrospinning can be spun The antibacterial effect of the polyimide / chitosan composite nanofiber membrane prepared by it is the highest.

[0056] Spinnability Test

[0057] For the samples produced by electrospinning, the spinnability index can be judged by observing the fiber morphology with the naked eye combined with the SEM image. If a large amount of si...

experiment example 2

[0061] For the (1) chitosan modification step of embodiment 1, according to the orthogonal experiment of four factor three levels of table 5 design, prepare polyimide / chitosan composite nanofiber membrane according to the method for embodiment 1, by detecting Escherichia coli antibacterial rate, optimization of enzyme modification parameters. The final optimal process parameters are: temperature 40℃, time 2h, enzyme substrate mass ratio 1:10, pH 7.0.

[0062] table 5

[0063]

[0064]

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Abstract

The invention discloses a preparation method of a high-transmittance antibacterial polyimide/chitosan composite nanofiber air filtering membrane as well as a product and application thereof and belongs to the technical field of new materials. The method includes the following steps: carrying out electrostatic spinning by taking polyamide acid as a precursor solution, carrying out thermal imidization to form a polyimide nanofiber membrane, and loading a layer of chitosan composite nanofiber on the surface of the polyimide nanofiber membrane through electrostatic spinning, wherein the chitosan used by the chitosan composite nanofiber is modified chitosan which is degraded by enzyme. According to the invention, the antibacterial performance is introduced, the filtering performance is improved, the usage amount of polyoxyethylene is reduced, and therefore, the antibacterial performance of the air filtering membrane is improved.

Description

technical field [0001] The invention relates to the field of new materials, in particular to a preparation method of a high-permeability antibacterial polyimide / chitosan composite nanofiber air filter membrane and its product and application. Background technique [0002] In recent years, due to serious air pollution, the removal of pollutant particles in the atmosphere has become increasingly important. The types of particle pollution include dust, smog, etc., among which PM 0.3 , PM 2.5 , PM 10 The hazards of inhalable particles are the most serious. PM particles are small in size and carry a large number of bacteria and viruses, which will enter the human circulatory system along with breathing. Being in an environment with poor air quality for a long time in daily work and life will have a huge impact on the health of the people. [0003] In order to protect human health and provide a clean and comfortable working and living environment, it is very important to prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/64B01D69/02B01D67/00B01D53/22
CPCB01D71/64B01D69/02B01D67/0002B01D53/228B01D2325/48Y02A50/2351
Inventor 张兴双李钰梁秀许冠辰王丹
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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