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A kind of high-strength polyimide porous film containing benzimidazole and phenyl side groups and its preparation method

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: 2016-06-08
BEIJING JIELANG CONTROLLABLE MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of high-strength polyimide porous film containing benzimidazole and phenyl side groups and its preparation method
  • A kind of high-strength polyimide porous film containing benzimidazole and phenyl side groups and its preparation method
  • A kind of high-strength polyimide porous film containing benzimidazole and phenyl side groups and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A preparation method for a high-strength polyimide porous membrane, comprising the steps of:

[0040] 1. Synthesis of polyamic acid solution:

[0041] Benzophenonetetraacid 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 TPEQ and DAPBI two diamine monomers with a molar ratio of 6:4 into the metered N,N-dimethyl Diethyl acetamide (DMAc), so that the total solid content is 20%; then mechanically stirred under the protection of nitrogen, and then BTDA equal to the total amount of the two diamines was added in batches, so that it continued to be kept under nitrogen atmosphere below 25°C After reacting for 5 hours, a viscous polyamic acid solution was obtained. The polyamic acid solution was sealed and placed in a refrigerator for use, and its viscosity was measured to be 5.6 Pa·s after 24 hours.

[0042] The structural formula of the polyamic aci...

Embodiment 2

[0049] 1. Synthesis of polyamic acid solution:

[0050] Benzophenonetetraacid 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 TPEQ and DAPBI two diamine monomers with a molar ratio of 6:4 into the metered DMAc, so that the total solid The content is 20%; then mechanically stirred under the protection of nitrogen, and then BTDA equal to the total amount of the two diamines is added in batches, and the reaction is continued for 5 hours below 25°C in a nitrogen atmosphere to obtain viscous polyamic acid solution. The polyamic acid solution was sealed and placed in a refrigerator for use, and its viscosity was measured to be 5.6 Pa·s after 24 hours.

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

[0052]

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

[0054] 2. Preparation of polyimide porous membrane:

[00...

Embodiment 3

[0059] 1. Synthesis of polyamic acid solution:

[0060] Benzophenonetetraacid 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 TPEQ and DAPBI two diamine monomers with a molar ratio of 6:4 into the metered DMAc, so that the total solid The content is 20%; then mechanically stirred under the protection of nitrogen, and then BTDA equal to the total amount of the two diamines is added in batches, and the reaction is continued for 5 hours below 25°C in a nitrogen atmosphere to obtain viscous polyamic acid solution. The polyamic acid solution was sealed and placed in a refrigerator for use, and its viscosity was measured to be 5.6 Pa·s after 24 hours.

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

[0062]

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

[0064] 2. Preparation of polyimide porous membrane:

[00...

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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 the technical field of polyimide porous membrane and its preparation, in particular to a polyimide porous membrane containing benzimidazole and benzene side groups prepared by a high-voltage electrospinning process and its application in the field of materials. 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 electrospinning, among which the electrospinning process is the most common and important method for preparing continuous ultrafine fibers and non-woven fabrics. The non-woven membrane material prepared by electrospinning has the characteristics of low density, large specific surface area, high porosity, and uniform pores. Therefore, this type of membrane material has good filterabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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