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A kind of polyimide film layer material with silicon dioxide on the surface and preparation method thereof

A technology of polyimide film and polyimide layer, which is applied in fiber processing, textile and papermaking, photovoltaic power generation, etc., can solve the problems of easy fracture of coating, high research cost, difficult industrialization, etc., and achieve excellent interface Combining the effects of performance, simple operation, and compact structure

Active Publication Date: 2022-05-17
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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  • A kind of polyimide film layer material with silicon dioxide on the surface and preparation method thereof
  • A kind of polyimide film layer material with silicon dioxide on the surface and preparation method thereof
  • A kind of polyimide film layer material with silicon dioxide on the surface and preparation method thereof

Examples

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

A polyimide film material whose surface is covered with silicon dioxide. The preparation method is as follows: firstly prepare a polyamic acid (PAA) nanofiber film and make it quantitatively adsorb the silicon dioxide precursor solution, and then spread it on the On the PAA wet film containing a large amount of solvent coated by PAA solution, the PAA and solvent in the lower wet film penetrate into the upper nanofiber film, dissolve and homogenize the nanofiber network in situ, and form a silica precursor / The "integrated" structure of polyamic acid interpenetrating network covering layer and polyamic acid base layer, and then controlled hydrolysis and heat treatment to finally obtain a polyimide film layer material coated with silicon dioxide on the surface. The composite membrane prepared by the method of the present invention has a uniform and dense silica covering layer on the surface, has the advantages of controllable thickness of the covering layer, excellent interface adhesion and good mechanical properties, and has low cost, simple process and wide application range. Wide, 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 Patents(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