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Semi-aromatic polyimide, preparation method and application thereof, and gas separation membrane containing the semi-aromatic polyimide

A gas separation membrane, polyimide technology, applied in its preparation method, semi-aromatic polyimide material, use and the field of gas separation membrane containing the same, can solve the problems of low permeability and selection, and achieve The effect of improving gas permeability, reducing the degree of orderly stacking, and increasing stacking distance

Active Publication Date: 2019-12-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas separation membrane prepared from the above polyimide is 2 , CO 2 、CH 4 , N 2 , O 2 low permeability and selectivity

Method used

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  • Semi-aromatic polyimide, preparation method and application thereof, and gas separation membrane containing the semi-aromatic polyimide
  • Semi-aromatic polyimide, preparation method and application thereof, and gas separation membrane containing the semi-aromatic polyimide
  • Semi-aromatic polyimide, preparation method and application thereof, and gas separation membrane containing the semi-aromatic polyimide

Examples

Experimental program
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Effect test

Embodiment 1

[0064] The present embodiment provides a kind of semi-aromatic polyimide, and its structural formula is as follows:

[0065]

[0066] The specific preparation method is as follows:

[0067] (1) Preparation of diamine monomer I containing imide chain link

[0068]Add the aromatic diamine DPD (8.1720g, 60mmol) into a 500mL three-neck flask under nitrogen protection, then add 150mL of NMP, and after the DPD is completely dissolved, add the aromatic dianhydride 6FDA (8.8848g, 20mmol), at room temperature Stir and react at low temperature for 12 hours. After the reaction is over, add 50 mL of water-carrying agent toluene, and stir and reflux at 180°C for 9 hours to obtain a solution of diamine monomer I containing imide chain segments. After the toluene is completely distilled off, stop Heating, after naturally cooling to normal temperature, the reaction solution was poured into a mixture of high-speed stirring methanol and water (2L, V 甲醇 :V 水 = 1:1), a precipitate was preci...

Embodiment 2

[0078] The present embodiment provides a kind of semi-aromatic polyimide, and its structural formula is as follows:

[0079]

[0080] The specific preparation method is as follows:

[0081] (1) Preparation of diamine monomer I containing imide chain link

[0082] Add the aromatic diamine DPD (8.1720g, 60mmol) into a 500mL three-necked flask under nitrogen protection, and then add 140mL of NMP. After the DPD is completely dissolved, add the aromatic dianhydride NTCDA (5.3636g, 20mmol), Stir and react for 9 hours. After the reaction is over, add 45 mL of water-carrying agent toluene, and stir and reflux for 10 hours at 180 ° C to obtain a solution of diamine monomer I containing imide chain segments. After the toluene is completely distilled, stop Heating, after naturally cooling to normal temperature, the reaction solution is poured into the mixture (3L, V 甲醇 :V 水 = 1:1), a precipitate was precipitated, and the obtained precipitate was dissolved in DMAc, then precipitated...

Embodiment 3

[0091] The present embodiment provides a kind of semi-aromatic polyimide, and its structural formula is as follows:

[0092]

[0093] The specific preparation method is as follows:

[0094] (1) Preparation of diamine monomer I containing imide chain link

[0095] Add the aromatic diamine o-Tolidine (12.738g, 60mmol) into a 500mL three-necked flask under nitrogen protection, and then add 150mL of NMP. After the o-Tolidine is completely dissolved, add the aromatic dianhydride BPDA (5.8844g, 20mmol ), stirred and reacted at 0°C for 24 hours, after the reaction was over, added 50 mL of water-carrying agent ortho-xylene, stirred and refluxed at 200°C for 2 hours, and obtained a solution of diamine monomer I containing imide chain segments, and waited After the o-xylene was completely distilled off, stop heating, and after naturally cooling to normal temperature, the reaction solution was poured into a mixture of methanol and water (2L, V 甲醇 :V 水 = 1:1), a precipitate was prec...

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Abstract

The invention provides a semi-aromatic polyimide material, a preparation method and application thereof, and a gas separation membrane containing the semi-aromatic polyimide material. The semi-aromatic polyimide has a structure shown as a formula I, can be used as a gas separation membrane material, and is obtained by synthesizing a diamine monomer I containing an imide chain link from aromatic dianhydride and aromatic or aliphatic diamine, synthesizing a diamine monomer II containing an imide chain link from alicyclic dianhydride and aromatic or aliphatic diamine, and polymerizing the diaminemonomer I and the diamine monomer II under the action of an initiator. The semi-aromatic polyimide molecular chain provided by the invention has a Troger base structure, and the aromatic ring structure in the main chain is matched with the alicyclic structure, so that the gas separation membrane prepared from the semi-aromatic polyimide molecular chain has good mechanical properties and heat-resistant stability, and has a high permeability coefficient and good selectivity when being used for hydrogen separation and air separation.

Description

technical field [0001] The invention belongs to the technical field of polyimide materials, and in particular relates to a semi-aromatic polyimide material, its preparation method, application and a gas separation membrane containing the same. Background technique [0002] Membrane separation technology for gas mixtures is a technology that uses the difference in permeability and selectivity of polymer membranes for different gas molecules to separate target gases from mixed gases. For example, the separation of oxygen and nitrogen from air, the separation of hydrogen from petroleum cracking gas, etc. Polyimide is an ideal raw material for gas separation membranes due to its high heat resistance, solvent resistance and good overall performance. However, conventional polyimide resins are difficult to dissolve, do not melt, are difficult to process, and have extremely low gas permeability, thus limiting the possibility of their wide application in industry. [0003] There ar...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08G73/12C08G73/06B01D53/22
CPCB01D53/228C08G73/0694C08G73/1075C08G73/12Y02C20/20Y02C20/40Y02P20/151
Inventor 庄永兵张宇万印华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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