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
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[0021] Example 1:
[0022] In a dry four-necked flask equipped with a mechanical stirrer, a thermometer, and a nitrogen outlet tube, 60mL of N,N-dimethylacetamide was added, and protected by nitrogen. Under strong mechanical stirring, 21.98g (0.06mol) was added. 2,2-Bis(3-amino-4-hydroxyphenyl)hexafluoropropane (Bis-AP-AF), stirred until completely dissolved and then cooled to -5-0℃; then, 19.62g (1.015×0.06mol ) 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) was dissolved in 60mL of N,N-dimethylacetamide, and then slowly added to the four-necked flask reactor after fully dissolved In the medium, react at -5-0°C for 2-6 hours to obtain a polyamic acid solution; dilute the synthesized polyamic acid with N,N-dimethylacetamide directly to a solution with a mass part of 5-10% , And then evenly spread on a clean glass plate; in a nitrogen-filled oven with a temperature increase rate of 1 ℃ / min, in turn at 60 ℃ constant temperature for 8 hours, 120 ℃ constant temperature for...
Example Embodiment
[0023] Example 2:
[0024] The difference between this embodiment and specific embodiment 1 is that the reaction temperature for synthesizing polyamic acid is 0-5°C. Others are the same as in 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 produced.
Example Embodiment
[0025] Example 3:
[0026] The difference between this example and specific example 1 is that 50 mL of N,N-dimethylacetamide and 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) were added to a four-necked flask. Dissolved in 50 mL of N,N-dimethylacetamide. Others are 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 is finally produced.
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