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Polyimide membrane layer material with surface coated with silicon dioxide and preparation method of polyimide membrane layer material

A technology of polyimide film and polyimide layer, which is applied in fiber processing, textile and paper making, photovoltaic power generation, etc., and can solve problems such as high research cost, easy cracking of coating, and complicated process

Active Publication Date: 2021-09-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods have the disadvantages of high research cost, complicated process, difficult industrialization, and easy cracking, delamination, and peeling of the coating.

Method used

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  • Polyimide membrane layer material with surface coated with silicon dioxide and preparation method of polyimide membrane layer material
  • Polyimide membrane layer material with surface coated with silicon dioxide and preparation method of polyimide membrane layer material
  • Polyimide membrane layer material with surface coated with silicon dioxide and preparation method of polyimide membrane layer material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A: Using pyromellitic dianhydride (PMDA) and 4,4'-diaminodiphenyl ether (ODA) as monomers, controlling the molar ratio of the two to 1:1, in N,N-dimethylacetamide (DMAc) condensation polymerization in the solvent to obtain a solid content of 12% polyamic acid (PAA) solution;

[0040] B: PAA nanofiber membrane with a thickness of 20 μm prepared by electrospinning

[0041] C: keep the humidity at 40% RH, the silica precursor compound quantitatively adsorbed on the surface of the PAA nanofiber membrane is adsorbed at a mass ratio of TEOS / PAA nanofiber membrane = 50:1, and it is left to stand for 2 hours for homogenization to obtain PAA nanofiber membrane with uniform adsorption of silica precursor compounds;

[0042] D: uniformly coat the PAA solution prepared in step A to form a film, and obtain a solvent-containing PAA wet film with a thickness of 180 μm;

[0043] E: Spread the PAA nanofiber membrane with TEOS adsorbed in step C on the PAA coated film, and after standi...

Embodiment 2

[0048] A: Using pyromellitic dianhydride (PMDA) and 4,4'-diaminodiphenyl ether (ODA) as monomers, controlling the molar ratio of the two to 1:1, in N,N-dimethylacetamide (DMAc) condensation polymerization in the solvent to obtain a solid content of 12% polyamic acid (PAA) solution;

[0049] B: PAA nanofiber membrane with a thickness of 40 μm prepared by electrospinning;

[0050] C: keep the humidity at 40% RH, the silica precursor compound quantitatively adsorbed on the surface of the PAA nanofiber membrane is adsorbed at a mass ratio of TEOS / PAA nanofiber membrane = 50:1, and it is left to stand for 2 hours for homogenization to obtain PAA nanofiber membrane with uniform adsorption of silica precursor compounds;

[0051] D: uniformly coat the PAA solution prepared in step A to form a film, and obtain a solvent-containing PAA wet film with a thickness of 180 μm;

[0052] E: Spread the PAA nanofiber membrane with TEOS adsorbed in step C on the PAA coated film, and after stand...

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Abstract

Disclosed is a polyimide membrane layer material with surface coated with silicon dioxide. The preparation method of the polyimide membrane layer material comprises the following steps of firstly, preparing a polyamide acid (PAA) nanofiber membrane, enabling the nanofiber membrane to quantitatively adsorb a silicon dioxide precursor solution, then flatly laying the nanofiber membrane on a PAA wet membrane which is formed by coating the PAA solution and contains a large amount of solvent, enabling the PAA and the solvent in the lower-layer wet membrane to permeate into the upper-layer nanofiber membrane, dissolving and homogenizing a nanofiber network in situ to form an integrated structure of a silicon dioxide precursor / polyamide acid interpenetrating network coating layer and a polyamide acid substrate layer, and carrying out controllable hydrolysis and heat treatment to finally obtain the polyimide membrane layer material with the surface coated with silicon dioxide. According to the composite membrane prepared by the method, the silicon dioxide coating layer on the surface of the composite membrane is uniform and compact, and the composite membrane has the advantages of controllable thickness of the coating layer, excellent interface cohesiveness, good mechanical property and the like, and is low in cost, simple in process, wide in application range and easy to realize industrial production.

Description

technical field [0001] The invention belongs to polyimide / silicon dioxide (SiO 2 ) field of composite technology, specifically relating to a surface-coated SiO 2 Polyimide film layer material and preparation method thereof. Background technique [0002] Electrospinning is a simple and effective method for preparing nanofibrous membranes. It has the advantages of simple equipment, easy operation, fast preparation, low cost, and wide application range. At the same time, the prepared nanofibrous membrane has the characteristics of large specific surface area, large aspect ratio, high porosity, and strong adsorption force, which makes it have application prospects in the fields of filter materials, biomedical functional materials, and high-performance battery separators. and significant advantages. [0003] Polyimide (PI) is a kind of high-performance polymer containing imide structure in its molecular structure. It has excellent temperature resistance, mechanical properties,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/79C08G73/10D04H1/4326D06M101/30
CPCD06M11/79C08G73/1071C08G73/105C08G73/1007D04H1/4326D06M2101/30Y02E10/50
Inventor 齐胜利王芮晗田国峰汪晓东武德珍
Owner BEIJING UNIV OF CHEM TECH
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