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Gas separation membrane manufacturing method

A technology for gas separation membranes and manufacturing methods, applied in separation methods, gas treatment, semi-permeable membrane separation, etc., which can solve the problems of membrane strength decline, insufficient results, and unobtained results, and achieve excellent film-forming effects

Active Publication Date: 2020-12-18
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Although attempts have been made to improve gas permeation characteristics by including inorganic nanoparticles in the polymer film as described above, the problem of the aggregation of the aforementioned nanoparticles is It is also a problem in the production of organic-inorganic composite gas separation membranes. As far as the existing organic-inorganic composite gas separation membranes are concerned, the strength of the membrane is reduced due to the aggregation of inorganic nanoparticles in the polymer matrix, and it is impossible to achieve high particle size. Therefore, the gas permeability can only be increased to about several times, which becomes a problem
[0006] Therefore, for example, as a method of improving the characteristics of gas separation membranes by including inorganic nanoparticles in polymer membranes, the following reports have also been made: using amino-containing The silane coupling agent treats the surface of silica nanoparticles to silylate the surface, and then treats the silylated particles with a polymer, thereby producing silica particles grafted with a polymer. The polymer-grafted silica particles obtained as described above were dispersed in a polymer to form a resin membrane, and the performance of the membrane as a gas separation membrane was investigated (see Non-Patent Document 1). In terms of the amount of permeation, etc., no sufficient results have been obtained.
[0007] In addition, the following gas separation membranes have been proposed in which, by bonding bulky hyperbranched polymers or dendrimers to the surface of silica nanoparticles, Thereby, aggregation does not occur in organic solvents and polymer matrices, the uniform dispersion is excellent, and the gas transmission rate is greatly improved (for example, refer to Patent Document 2). Aspects, etc., did not obtain sufficient results

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] 0.200 g of 50 mass % MB1 was added to 1.8 g of THF so that the total solid content concentration was 10 mass % and the ST-G1 concentration was 50 mass % relative to PIM-1, and vigorously stirred. After the resin was dissolved, ultrasonic irradiation was performed for about 5 minutes to prepare a varnish. It was coated on a Si wafer using a squeegee with a GAP of 100 μm, and then dried in a THF atmosphere to produce a composite film. The dispersibility of the particles was observed by cross-sectional SEM of the film. The results of cross-sectional SEM are shown in figure 1 . The dispersion stability, film-forming property, and dispersibility of the varnish were evaluated according to the following criteria, and the results are shown in Table 1.

[0143] 〇Evaluation of dispersion stability of varnish

[0144] · After leaving the prepared varnish to stand for about 5 minutes, visually evaluate the presence or absence of particle sedimentation

[0145] Basically no sed...

Embodiment 2

[0154] The same procedure was carried out except that the addition amounts of 50% by mass of MB1 and PIM-1 were adjusted so that the concentration of ST-G1 relative to PIM-1 was 30% by mass. The results of cross-sectional SEM are shown in figure 2 . The dispersion stability, film-forming property, and dispersibility of the varnish were evaluated according to the following criteria, and the results are shown in Table 1.

Embodiment 3

[0156] The same procedure was carried out except that the addition amounts of 50% by mass of MB1 and PIM-1 were adjusted so that the concentration of ST-G1 relative to PIM-1 became 10% by mass. The results of cross-sectional SEM are shown in image 3 . The dispersion stability, film-forming property, and dispersibility of the varnish were evaluated according to the following criteria, and the results are shown in Table 1.

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Abstract

The present invention is a method for manufacturing a gas separation membrane in which microparticles are uniformly dispersed in resin, the method comprising the following steps (A) and (B): (A) a step for producing a master batch by mixing the microparticles and a matrix resin, the mass of the microparticles being 1-50 mass% with respect to total mass; and (B) a step for dissolving the master batch in a solvent, applying the result to a substrate, and evaporating the solvent.

Description

technical field [0001] The present invention relates to a method for producing a gas separation membrane in which fine particles are uniformly dispersed in a resin, without introducing a polymer to the particle surface, changing a varnish solvent, or adding a dispersant to fine particles that are difficult to disperse in a resin. Background technique [0002] In recent years, as part of nanotechnology research, research on nanoscale fine particles (nanoparticles) with an average particle diameter of 1 nm to several hundreds of nm has been actively conducted. Nanoparticles obtained by forming a raw material into a nanometer size are known to exhibit and impart various forms and characteristics unlike conventional bulk materials, and are expected to be used in a wide range of industrial fields. Nanoparticles can be produced as primary particles, but they are highly aggregated due to their fineness, resulting in the formation of aggregates with particle diameters in the micron ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/76
CPCB01D69/148B01D71/72B01D71/70B01D53/228B01D2256/245B01D2256/12B01D2257/102B01D67/00793B01D69/1411B01D69/14111B01D71/381B01D67/00091B01D2325/0283B01D71/76B01D71/027
Inventor 小高一利伊左治忠之堀内雄史
Owner NISSAN CHEM IND LTD