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A kind of high-performance polyimide hollow fiber membrane and its preparation method and application

A technology of polyimide and fiber membranes, which is applied in the field of preparation of polyimide hollow fiber gas separation membranes. It can solve the problems of molecular weight drop, membrane filaments are fragile and easy to break, and it is difficult to prepare membrane components, so as to achieve mechanical strength. Reinforcement, the effect of improving solvent resistance and mechanical strength

Active Publication Date: 2021-02-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the imine ring in the polyimide material is easy to hydrolyze, and the solvent replacement process will cause its molecular weight to decrease, and the prepared membrane filaments are fragile and easy to break, making it difficult to prepare membrane components and apply them in high-pressure environments

Method used

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  • A kind of high-performance polyimide hollow fiber membrane and its preparation method and application
  • A kind of high-performance polyimide hollow fiber membrane and its preparation method and application
  • A kind of high-performance polyimide hollow fiber membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Annealing the hollow fiber membrane filaments prepared in Example 1. The annealing procedure is: from room temperature to 110 degrees at a heating rate of 10 °C / min, staying at 110 °C for 1 hour, and at a heating rate of 5 °C / min from 110 °C to 110 °C. °C to 250 °C, at a rate of 2 °C / min from 250 to 300, and stay for 1 hour. Tensile strength, Young's modulus and elongation at break are shown in Table 1, figure 1 with figure 2 The value corresponding to 300℃ in

Embodiment 2

[0048] Annealing the hollow fiber membrane filaments prepared in Example 1. The annealing procedure is: from room temperature to 110 degrees at a heating rate of 10 °C / min, staying at 110 °C for 1 hour, and at a heating rate of 5 °C / min from 110 °C to 110 °C. °C to 250 °C, with a heating rate of 2 °C / min from 250 to 350, and stay for 1 hour. Tensile strength, Young's modulus and elongation at break are shown in Table 1, figure 1 with figure 2 The value corresponding to 350℃ in

Embodiment 3

[0050] Annealing the hollow fiber membrane filaments prepared in Example 1. The annealing procedure is: from room temperature to 110 degrees at a heating rate of 10 °C / min, staying at 110 °C for 1 hour, and at a heating rate of 5 °C / min from 110 °C to 110 °C. °C to 250 °C, with a heating rate of 2 °C / min from 250 to 400, and stay for 1 hour. Tensile strength, Young's modulus and elongation at break are shown in Table 1, figure 1 with figure 2 The value corresponding to 400℃ in

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Abstract

The invention provides a preparation method for a high-performance polyimide hollow fiber membrane. The hollow fiber membrane is prepared by using a dry-wet spinning technology, and the mechanical strength and the solvent resistance of the polyimide hollow fiber membrane are improved by using a high-temperature annealing method. When the annealing temperature is close to the glass-transition temperature, the annealing process can improve the tensile strength of the polyimide hollow fiber membrane, and when the annealing temperature is higher than the glass-transition temperature, the tensile strength and the solvent resistance of the polyimide hollow fiber membrane can be obviously improved. The method is simple and effective, and has a good application prospect in the aspect of gas separation.

Description

technical field [0001] The invention belongs to the field of gas separation, and in particular relates to a preparation method of a gas separation membrane, in particular to a preparation method and application of a polyimide hollow fiber gas separation membrane. Background technique [0002] Gas separation membrane is a new type of gas separation technology that has developed very rapidly in recent decades. It has very successful applications in hydrogen recovery, natural gas purification, organic vapor recovery, air separation and other fields. [0003] There are many kinds of polymer membrane materials, such as cellulose acetate, polysulfone, polyphenylene oxide, polyamide, polyimide and so on. Polyimide is a class of chemical-resistant, high-temperature-resistant, high-strength and high-performance materials. Aromatic polyimide material has rich benzene ring structure, strong polymer chain rigidity, and good gas separation performance. Gas separation membranes are gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64B01D69/08B01D67/00B01D53/22
CPCB01D53/228B01D67/0002B01D69/088B01D71/64
Inventor 任吉中盛鲁杰花开胜李晖邓麦村
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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