Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Polyimide gas separation membrane with high molecular weight and preparation method thereof

A gas separation membrane, polyimide technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of poor air permeability, difficult to process into a membrane, high rigidity, etc., and achieve excellent membrane formation. , the effect of stable performance and low cost

Inactive Publication Date: 2010-05-05
BEIJING RADIATION APPL RES CENT +1
View PDF0 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyimide usually has good separation selectivity, but most polyimide chains are rigid and have poor air permeability. Type polyimide neither melts nor dissolves until the decomposition temperature, so it is difficult to process into a film

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 60mL of N,N-dimethylacetamide to a dry four-necked flask equipped with a mechanical stirrer, a thermometer, and a nitrogen inlet and outlet tube, and protect it with nitrogen. Under strong mechanical stirring, add 21.98g (0.06mol) of 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (Bis-AP-AF), stirred until completely dissolved and then cooled to -5-0°C; then, 19.62g (1.015×0.06mol ) of 3,3',4,4'-benzophenonetetraacid dianhydride (BTDA) was dissolved in 60mL of N,N-dimethylacetamide, fully dissolved and then slowly added to the above-mentioned four-necked flask reactor , react at -5-0°C for 2-6h to obtain a polyamic acid solution; directly dilute the synthesized polyamic acid with N,N-dimethylacetamide to a solution with a mass fraction of 5-10% , and then evenly spread it on a clean glass plate; in a nitrogen-filled oven at a heating rate of 1°C / min, keep the temperature at 60°C for 8 hours, 120°C for 1h, 150°C for 1h, 200°C for 2h, and 250°C. 1-3h, 275°C consta...

Embodiment 2

[0024] The difference between this example and specific example 1 is that the reaction temperature for synthesizing polyamic acid is 0-5°C. Others are the same as in specific example 1; a high-molecular-weight polyimide gas separation membrane with a thickness of 43 μm and a weight-average molecular weight of 109,800 is finally prepared.

Embodiment 3

[0026] The difference between this example and specific example 1 is that 50mL of N,N-dimethylacetamide and 3,3',4,4'-benzophenonetetraacid dianhydride (BTDA) were added to a four-necked flask Dissolve in 50 mL of N,N-dimethylacetamide. Others were the same as in Example 1; a high-molecular-weight polyimide gas separation membrane with a thickness of 57 μm and a weight-average molecular weight of 98,300 was finally obtained.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a polyimide gas separation membrane with high molecular weight and a preparation method thereof, the polyimide gas separation membrane consists of aromatic diamine and aromatic dianhydride, a polar solvent is used for matching, and the polyimide gas separation membrane with the high molecular weight is prepared by the technological steps of preparing polyamic acid solution, preparing a polyimide membrane and stripping the polyimide membrane, thereby preparing the polyimide gas separation membrane with the high molecular weight. The polyimide gas separation membrane has the advantages of strong solubility, high molecular weight, good permeability, stable performances, good membrane-forming property, easy processing and molding, simple preparation technology, low cost and easy industrialization, and can be extensively applied in CO2 / CH4 and CO2 / H2 separation in petroleum and natural gas and be suitable for popularization.

Description

Technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high molecular weight polyimide gas separation membrane and a preparation method. technical background [0002] In the field of polymer material technology, polyimide material is a high-performance polymer material with imide ring structure characteristics, which has excellent heat resistance, radiation resistance, excellent mechanical properties and electrical properties, etc. Has been widely used in aviation, aerospace, automobile, petrochemical and other technical fields. Among them, polyimide gas separation membrane is one of the most widely used materials of polyimide. Polyimide gas membrane separation is a "green technology", and because it has the advantages of low energy consumption, environmental friendliness, simple process, convenient operation, strong separation, etc., compared with traditional separation technologies (adsorption, absorption, cryogenic se...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01D71/64B01D69/06
Inventor 郑艳红李光珠王连才曾心苗鲍矛李淑凤郭宝华徐军
Owner BEIJING RADIATION APPL RES CENT
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com