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Polyimide nano cobweb fiber filtering membrane and preparation method thereof

A technology of polyimide fiber and fiber filter membrane, which is applied in the field of polyimide nano-spider fiber filter membrane and its preparation, and can solve the problems of low filtration efficiency and the like

Active Publication Date: 2021-11-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the object of the present invention is to provide a polyimide nano-spider fiber filter membrane and its preparation method, which effectively solves the problem of low filtration efficiency under current high temperature conditions

Method used

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  • Polyimide nano cobweb fiber filtering membrane and preparation method thereof

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preparation example Construction

[0022] The invention provides a preparation method of a polyimide nano-cobweb fiber filter membrane with excellent high-temperature and high-efficiency filtration performance, and the specific steps are as follows:

[0023] (1) Dissolve 10~30g 4,4'-diaminodiphenyl ether (ODA) in 100~300mL N,N-dimethylformamide (DMF), slowly add 10.5~31.5g pyromellitic anhydride ( PMDA), stirring at 0-4 ℃ for 12-24 h, the polyamic acid (PAA) precursor solution was obtained by low-temperature polycondensation reaction;

[0024] (2) Add 0.003-0.01 g of lithium chloride to 10 mL of polyamic acid precursor solution, and mix uniformly to form a spinning solution;

[0025] (3) Take 3-10 mL of the spinning solution to be spun into a syringe, the voltage is 25-30 kV, the speed of the propeller is 0.2-0.5 mL / h, and spin to form a film to obtain a polyimide fiber film with a spider web structure ;

[0026] (4) drying the polyimide fiber membrane with spider web structure prepared in (3) in an oven at 6...

Embodiment 1

[0031] (1) Dissolve 10 g of 4,4'-diaminodiphenyl ether (ODA) in 100 mL of N-N dimethylformamide (DMF), slowly add 10.5 g of pyromellitic anhydride (PMDA), and stir at 4°C 12h, the polyamic acid (PAA) precursor solution was prepared;

[0032] (2) adding 0.003 g of lithium chloride to 10 mL of polyamic acid precursor solution, and mixing uniformly to form a spinning solution;

[0033] (3) take 4mL of spinning solution to be placed in a syringe, the voltage is 28kV, the speed of the propeller is 0.3mL / h, and the spinning is filmed to obtain a polyimide fiber film with a spider web structure;

[0034] (4)) drying the polyimide fiber membrane with spider web structure prepared in (3) in an oven at 60° C. for 24 hours to remove excess solvent;

[0035] (5) The polyimide fiber membrane with spider web structure obtained in (4) was imidized at 25° C. for 3 hours in a tube furnace, and a polyimide nano spider web fiber filter membrane with high temperature and high efficiency filtrati...

Embodiment 2

[0038] (1) Dissolve 30 g of 4,4'-diaminodiphenyl ether (ODA) in 300 mL of N-N dimethylformamide (DMF), slowly add 20 g of pyromellitic anhydride (PMDA), and stir at 0°C for 24 h , to prepare polyamic acid (PAA) precursor solution;

[0039] (2) adding 0.01 g of lithium chloride to 10 mL of polyamic acid precursor solution, and mixing to form a spinning solution;

[0040] (3) get 3mL of spinning solution to be placed in a syringe, the voltage is 30kV, the speed of the propeller is 0.2mL / h, and the spinning is filmed to obtain a polyimide fiber film with a spider web structure;

[0041] (4)) drying the polyimide fiber membrane with spider web structure prepared in (3) in an oven at 60° C. for 12 hours to remove excess solvent;

[0042] (5) The polyimide fiber membrane with spider web structure obtained in (4) was imidized at 300° C. for 4 h in a tube furnace, and a polyimide nano spider web fiber filter membrane with high temperature and high efficiency filtration was successful...

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Abstract

The invention discloses a polyimide nano cobweb fiber filtering membrane and a preparation method thereof, and belongs to the field of polyimide fiber preparation. The preparation method comprises the following steps of dissolving 4, 4 '-diaminodiphenyl ether in a solvent, continuously and slowly adding pyromellitic dianhydride, and reacting to obtain a polyamide acid precursor solution; adding lithium chloride into the obtained polyamide acid precursor solution, and uniformly mixing to obtain a to-be-spun solution; spinning the to-be-spun solution into a membrane to obtain a polyimide fiber membrane with a cobweb structure; and removing the solvent from the obtained polyimide fiber membrane with the cobweb structure, and then carrying out imidization treatment to obtain the polyimide nano cobweb fiber filtering membrane. The prepared polyimide nano cobweb fiber filtering membrane has the cobweb structure, has high filtering efficiency and high temperature resistance, can filter fine particles and can be recycled for multiple times.

Description

technical field [0001] The invention belongs to the field of polyimide fiber preparation, and relates to a polyimide nano-cobweb fiber filter membrane and a preparation method thereof. Background technique [0002] There are many sources of air pollution, including harmful gases, fine droplets and solid particles. At present, with the further advancement of industrialization, air pollution is becoming more and more rampant, seriously endangering the physical and mental health of human beings. Air pollution has become one of the important environmental problems that need to be solved urgently. Therefore, the development of high-efficiency air filter materials is of great significance for maintaining human health and sustainable development of the environment. [0003] The research of high-performance spider web structure filter material provides a new solution to the above problems. Traditional filter materials are usually not resistant to high temperature and have poor filt...

Claims

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Application Information

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IPC IPC(8): D01F6/94D01F1/10D01F11/08C08G73/10D04H1/728D04H1/4326D01D5/00B01D71/64B01D69/02B01D67/00B01D46/00B01D46/54
CPCD01F6/94D01F1/10D01F11/08C08G73/1071D04H1/728D04H1/4326D01D5/0015B01D71/64B01D69/02B01D67/0079B01D46/0001B01D46/543B01D46/546
Inventor 陆赵情田萃钰王亚芳宁逗逗张雨婷赵瑞霞耿博代啟阳
Owner SHAANXI UNIV OF SCI & TECH
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