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Method for in-situ growth of nanoscale metal organic framework ZIF-8 on surfaces of polypropylene melt-blown cloth fibers

A polypropylene fiber, ZIF-8 technology, applied in the direction of fiber type, fiber treatment, ultrasonic/sonic fiber treatment, etc., can solve problems such as loss of air permeability, and achieve the effect of improving filtration performance, improving universality, and mild conditions

Pending Publication Date: 2021-12-31
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Publication No. Chinese Patent CN108295672B discloses a method for preparing a metal-organic framework ZIF-8 film, but the method is synthesized in two steps, wherein the conditions of the hydrothermal reaction will limit the selection range of the substrate, and the synthesized ZIF-8 film covers The original pores of the non-woven fabric are lost, making it lose its breathability

Method used

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  • Method for in-situ growth of nanoscale metal organic framework ZIF-8 on surfaces of polypropylene melt-blown cloth fibers
  • Method for in-situ growth of nanoscale metal organic framework ZIF-8 on surfaces of polypropylene melt-blown cloth fibers
  • Method for in-situ growth of nanoscale metal organic framework ZIF-8 on surfaces of polypropylene melt-blown cloth fibers

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Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0033] Embodiment 1-3 scheme is as follows:

[0034]

Embodiment 1

[0036] The first step is to set the gram weight to 45g / m 2 The PP fiber membrane is cut into a circle with a radius of 9cm. Then the cut PP fiber membrane was put into methanol solution (500mL), and then pretreated under 300W ultrasonic power for 30 minutes. Finally, the sample was washed three times with distilled water and dried in a conventional oven at 80°C for 12 hours to remove excess impurities and the electret effect of the fiber film.

[0037] In the second step, the dried sample is put into a solution with a polyacrylamide concentration of 0.5%, and kept for 8 hours after immersion. The samples were then taken out and dried in a conventional oven at 80°C for 12 hours.

[0038] The third step is to put the dried PP fiber membrane sample into Zn(NO 3 ) 2 ·6H 2 O / methanol solution, kept for 3 hours, called solution A.

[0039] Step 4: After mixing the dimethylimidazole / methanol solution with a molar ratio of 8:560 evenly, slowly pour it into solution A and react f...

Embodiment 2

[0042] The first step is to set the gram weight to 45g / m 2 The PP fiber membrane is cut into a circle with a radius of 9cm. Then the cut PP fiber membrane was put into methanol solution (500mL), and then pretreated under the ultrasonic power of 450W for 30 minutes. Finally, the sample was washed three times with distilled water and dried in a conventional oven at 80°C for 12 hours to remove excess impurities and the electret effect of the fiber film.

[0043] In the second step, the dried sample is put into a solution with a polyacrylamide concentration of 1%, and kept for 10 hours after immersion. The samples were then taken out and dried in a conventional oven at 80°C for 12 hours.

[0044] The third step is to put the dried PP fiber membrane sample into Zn(NO 3 ) 2 ·6H 2 O / methanol solution, kept for 3 hours, called solution B.

[0045] Step 4: After mixing the dimethylimidazole / methanol solution with a molar ratio of 7:560 evenly, slowly pour it into solution B and r...

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Abstract

The invention belongs to the field of fiber composite membrane preparation methods, and discloses a preparation method for in-situ growth of nanoscale (less than 100 nm) ZIF-8 crystals on the surfaces of inert polypropylene melt-blown cloth fibers. The preparation method comprises the following steps of firstly, modifying polypropylene fibers with polyacrylamide to enable the polypropylene fibers to have active groups, then adjusting the proportion of metals and organic ligands of ZIF-8 so as to control the size of the crystals, and uniformly growing the nanoscale ZIF-8 crystals on the surfaces of the polypropylene fibers through an in-situ growth method. As the nanoscale ZIF-8 crystals have larger specific surface area, higher porosity and abundant active functional groups, gas circulation and particulate matter capture can be facilitated. The ultra-small ZIF-8 particles are firmly combined on the surfaces of the fibers, and original holes among the fibers cannot be blocked; while the filtration efficiency is relatively high, the increase of filtration resistance can be greatly inhibited, and the Trade-off effect of a fiber filtration membrane is effectively reduced; and the method is mild in reaction condition, simple in preparation process and suitable for amplification synthesis and actual production application.

Description

technical field [0001] The invention belongs to the field of fiber composite membrane preparation, and in particular relates to a preparation method for the stable combination of a metal organic framework and an inert fiber. Background technique [0002] At present, due to the improvement of living standards and the rapid deterioration of environmental quality, people's attention to air quality has risen rapidly, and the content of PM2.5 in the air has become an important criterion for judging air quality. So removing particulate matter from the air is very important to our health. So far, air filters have been developed rapidly. However, further improvements are needed in terms of high removal efficiency, low pressure drop, and stability. [0003] Porous materials that can be used in air filters have been rapidly developed, especially metal-organic frameworks (MOFs), which are produced through coordinate bonds between metals (or metal clusters) and organic species with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/687D06M15/285D06M13/144D06M10/02D06M10/08D06M10/10D06M101/20
CPCD06M15/687D06M15/285D06M13/144D06M10/02D06M10/08D06M10/10D06M2101/20
Inventor 徐志伟成颖李秋昱王维邵瑞琪裴晓园刘胜凯荆妙蕾邓辉
Owner TIANJIN POLYTECHNIC UNIV
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