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A kind of polyimide hollow fiber and its preparation method and application

A technology of polyimide and liquid polyamic acid, which is applied in the field of high-performance membrane separation, can solve problems such as poor separation effect, and achieve outstanding mechanical properties and operating pressure, excellent medium corrosion resistance, and good permeation and separation performance. Effect

Active Publication Date: 2019-08-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect of poor separation effect of polyimide hollow fibers in the prior art, to provide a polyimide hollow fiber and its preparation method and application

Method used

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  • A kind of polyimide hollow fiber and its preparation method and application
  • A kind of polyimide hollow fiber and its preparation method and application
  • A kind of polyimide hollow fiber and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] This example is used to illustrate the polyimide hollow fiber of the present invention and its preparation method.

[0075](1) Select NMP as solvent, get biphenyl tetracarboxylic dianhydride (BPDA), benzophenone tetracarboxylic dianhydride (BTDA), p-phenylenediamine (p-PDA), quinazolinone diamine by 1: The molar ratio of 0.5:1:0.5 is reacted at 25 ℃ for 3h to prepare spinning solution polyamic acid, and adjust the solid content of the spinning solution polyamic acid obtained in step (1) to 20% by weight, and the solid content is 20% by weight The rotational viscosity of polyamic acid in the spinning solution is 50Pa·s, and the intrinsic viscosity is 2.5dl / g;

[0076] (2) The spinning liquid polyamic acid and the spinning core liquid obtained in step (1) are extruded by a dry-jet wet spinning method and immersed in a coagulation bath to solidify to obtain a polyamic acid hollow fiber, wherein , the temperature of the coagulation bath is 0°C, the distance between the spi...

Embodiment 2

[0084] This example is used to illustrate the polyimide hollow fiber of the present invention and its preparation method.

[0085] (1) Select dimethylacetamide as solvent, take biphenyltetracarboxylic dianhydride (BPDA), benzophenone tetracarboxylic dianhydride (BTDA), p-phenylenediamine (p-PDA), quinazolinone two The amine was reacted at 25°C for 3h at a molar ratio of 1:0.1:1:0.1 to prepare the spinning solution polyamic acid, and the solid content of the spinning solution polyamic acid obtained in step (1) was adjusted to 15% by weight, and the solid content The rotational viscosity of polyamic acid that is 15% by weight of the spinning solution is 20Pa·s, and the intrinsic viscosity is 2.0dl / g;

[0086] (2) The spinning liquid polyamic acid and the spinning core liquid obtained in step (1) are extruded by a dry-jet wet spinning method and immersed in a coagulation bath to solidify to obtain a polyamic acid hollow fiber, wherein , the temperature of the coagulation bath is...

Embodiment 3

[0094] This example is used to illustrate the polyimide hollow fiber of the present invention and its preparation method.

[0095] (1) Select dimethylformamide as solvent, take biphenyltetracarboxylic dianhydride (BPDA), benzophenone tetracarboxylic dianhydride (BTDA), p-phenylenediamine (p-PDA), quinazolinone two Amine was reacted at 25°C for 3h at a molar ratio of 1:0.1:0.7:0.4 to prepare spinning solution polyamic acid, and the solid content of the spinning solution polyamic acid obtained in step (1) was adjusted to 18% by weight, and the solid content The rotational viscosity of polyamic acid to 18% by weight of the spinning solution is 40Pa·s, and the intrinsic viscosity is 2.5dl / g;

[0096] (2) The spinning liquid polyamic acid and the spinning core liquid obtained in step (1) are extruded by a dry-jet wet spinning method and immersed in a coagulation bath to solidify to obtain a polyamic acid hollow fiber, wherein , the temperature of the coagulation bath is 25°C, the ...

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Abstract

The invention relates to the technical field of high-performance membrane separation and discloses a polyimide hollow fiber and a preparation method and application thereof. A structural formula (I) of polyimide in the polyimide hollow fiber is as shown in the specification. The polyimide hollow fiber prepared according to the method has great mechanical properties, high temperature resistance andgas separation effects.

Description

technical field [0001] The invention relates to the technical field of high-performance membrane method separation, in particular to a polyimide hollow fiber and its preparation method and application. Background technique [0002] Membrane separation technology is a high-efficiency and energy-saving material separation and concentration technology that has emerged in recent years. It has gradually expanded from the initial desalination of seawater and brackish water, preparation of pure water and ultrapure water, and industrial water reuse to environmental protection, chemical industry, In fields such as medicine and food, the development prospect has attracted much attention. [0003] From the 1980s to the 1990s, industrial-scale gas membrane separation technology appeared, the most important of which was the establishment of the Prism system for hydrogen / nitrogen separation by Monsanto Company in the United States in 1979. In 1985, DOW Chemical Company provided Generon, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10D01F6/94D01F6/78D01F1/08D01D5/24D01D5/06D01D10/06D01D10/02D01D5/12B01D53/22
CPCB01D53/228C08G73/1007C08G73/1067C08G73/1085D01D5/06D01D5/12D01D5/24D01D10/02D01D10/06D01F1/08D01F6/78D01F6/94Y02P70/62
Inventor 武德珍田国峰李建华齐胜利
Owner BEIJING UNIV OF CHEM TECH
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