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High-strength polyimide porous membrane including benzimidazole and benzene lateral groups and manufacturing method thereof

A technology of polyimide and benzimidazole, applied in the field of polyimide porous membrane and its preparation, can solve the problems of small interaction force between fibers, poor mechanical properties of porous membrane, small size, etc., to improve processing performance , Improve the mechanical strength, improve the effect of tensile strength

Inactive Publication Date: 2013-12-04
BEIJING JIELANG CONTROLLABLE MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The electrospinning process is used to prepare polyimide porous membranes. In addition to the low efficiency of this technology from the laboratory to the industrialization, there is also the problem that the porous membranes brought about by this technology are due to the small interaction force between fibers. The mechanical properties of porous membranes are poor, and it is difficult to be applied in practice
At present, some researchers have prepared porous membranes with high mechanical properties by applying an external magnetic field, electric field or special mechanical devices to generate a high degree of orientation, but the size of this porous membrane is very small.

Method used

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  • High-strength polyimide porous membrane including benzimidazole and benzene lateral groups and manufacturing method thereof
  • High-strength polyimide porous membrane including benzimidazole and benzene lateral groups and manufacturing method thereof
  • High-strength polyimide porous membrane including benzimidazole and benzene lateral groups and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0039] A method for preparing a high-strength polyimide porous membrane includes the following steps:

[0040] 1. Synthesis of polyamic acid solution:

[0041] According to benzophenone tetraacid dianhydride (BTDA): 1,4-bis(4'-aminophenoxy)-2-(phenyl)benzene (TPEQ): 2-(4-aminophenyl)-5- Aminobenzimidazole (DAPBI) = 10:6:4 molar ratio for weighing and mixing, first add the two diamine monomers TPEQ and DAPBI with a molar ratio of 6:4 to the metered N,N-dimethyl In DMAc, make the total solid content 20%; then mechanically stir under the protection of nitrogen, and then add BTDA equal to the total amount of the two diamines in batches, and keep it under 25℃ in a nitrogen atmosphere The reaction was carried out for 5 hours to obtain a viscous polyamic acid solution. The polyamic acid solution was sealed and placed in a refrigerator for later use. After 24 hours, its viscosity was measured to be 5.6 Pa·s.

[0042] The structural formula of the polyamic acid polymer obtained in this syn...

Embodiment 2

[0049] 1. Synthesis of polyamic acid solution:

[0050] According to benzophenone tetraacid dianhydride (BTDA): 1,4-bis(4'-aminophenoxy)-2-(phenyl)benzene (TPEQ): 2-(4-aminophenyl)-5- Aminobenzimidazole (DAPBI) = 10:6:4 molar ratio for weighing and mixing, first add the two diamine monomers TPEQ and DAPBI with a molar ratio of 6:4 to the metered DMAc to make the total solid The content is 20%; then mechanically stirred under the protection of nitrogen, and then the BTDA equal to the total amount of the two diamines is added in batches, and the reaction is continued for 5 hours under a nitrogen atmosphere below 25°C to obtain viscous polyamic acid Solution. The polyamic acid solution was sealed and placed in a refrigerator for later use. After 24 hours, its viscosity was measured to be 5.6 Pa·s.

[0051] The structural formula of the polyamic acid polymer obtained in this synthesis step is as follows:

[0052]

[0053] Where n:m=4:6.

[0054] 2. Preparation of polyimide porous mem...

Embodiment 3

[0059] 1. Synthesis of polyamic acid solution:

[0060] According to benzophenone tetraacid dianhydride (BTDA): 1,4-bis(4'-aminophenoxy)-2-(phenyl)benzene (TPEQ): 2-(4-aminophenyl)-5- Aminobenzimidazole (DAPBI) = 10:6:4 molar ratio for weighing and mixing, first add the two diamine monomers TPEQ and DAPBI with a molar ratio of 6:4 to the metered DMAc to make the total solid The content is 20%; then mechanically stirred under the protection of nitrogen, and then the BTDA equal to the total amount of the two diamines is added in batches, and the reaction is continued for 5 hours under a nitrogen atmosphere below 25°C to obtain viscous polyamic acid Solution. The polyamic acid solution was sealed and placed in a refrigerator for later use. After 24 hours, its viscosity was measured to be 5.6 Pa·s.

[0061] The structural formula of the polyamic acid polymer obtained in this synthesis step is as follows:

[0062]

[0063] Where n:m=4:6.

[0064] 2. Preparation of polyimide porous mem...

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Abstract

The invention discloses a polyimide porous membrane including benzimidazole and benzene lateral groups. The structure of the polyimide porous membrane including the benzimidazole and the benzene lateral groups is shown as the formula (I), wherein in the formula, n:m=4:6. The molecular mass of the polymer is 50 thousand to 150 thousand. A novel polyimide porous membrane material which is good in heat-resistant performance and processable performance is designed from the molecular viewpoint and can be widely applied to the fields of battery diaphragms, capacitor diaphragms, air purification, sewage processing, low-dielectric materials, ultrafiltration membranes, protection materials, catalytic carriers and the like.

Description

Technical field [0001] The invention relates to a polyimide porous membrane and the technical field of its preparation, in particular to a polyimide porous membrane containing benzimidazole and benzene side groups prepared by a high-voltage electrostatic spinning process and its application in the material field. Background technique [0002] With the rapid development of nanomaterial technology, nanofiber technology has become the frontier and research hotspot of fiber science. The methods for preparing nanofibers include stretching, template polymerization, phase separation, self-organization, and electrostatic spinning. Among them, the electrostatic spinning process is the most common and important method for preparing continuous ultrafine fibers and non-woven fabrics. The non-woven membrane material prepared by the electrostatic spinning method has the characteristics of low density, large specific surface area, high porosity, uniform pores, etc., so this type of membrane mat...

Claims

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Application Information

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IPC IPC(8): D04H1/4326D04H1/728D06C7/00
Inventor 于晓慧张艾葛晓菁
Owner BEIJING JIELANG CONTROLLABLE MEMBRANE TECH
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