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A kind of polyimide film with dense silica layer of high adhesion on the surface and preparation method thereof

A polyimide film, silicon dioxide technology, applied in the coating, photovoltaic power generation and other directions, can solve the problems of peeling, surface inorganic coating fracture, etc., to achieve high controllability, simple implementation, good adhesion Effect

Active Publication Date: 2022-05-17
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of polyimide (PI / SiO 2 ) thin film, which not only retains the original excellent performance of the finished film, but also can effectively solve the problems that the surface inorganic coating is prone to fracture, peeling, delamination, etc., and can realize the surface SiO 2 Overlay thickness controllable

Method used

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  • A kind of polyimide film with dense silica layer of high adhesion on the surface and preparation method thereof
  • A kind of polyimide film with dense silica layer of high adhesion on the surface and preparation method thereof
  • A kind of polyimide film with dense silica layer of high adhesion on the surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A: Use 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PDA) as monomers, and control the molar ratio of the two to 1:1. Condensation polymerization in methyl acetamide (DMAc) solvent obtains a polyamic acid (PAA) solution with a solid content of 12%. Add TEOS to the PAA solution. The quality of TEOS is that the silicon dioxide finally generated by its entire reaction accounts for the PAA thermal ring. 30% of the mass of PI after melting;

[0040] B: PAA / SiO was prepared by electrospinning PAA / TEOS solution 2 Precursor nanofibrous membrane 15 μm,;

[0041] C: The finished PI base film is etched and modified with 1mol / L KOH aqueous solution for 10 minutes, and then acidified with 1wt% hydrochloric acid aqueous solution for 30 minutes to obtain a polyimide film with a PAA modified layer on the surface. The layer thickness is 2 μm;

[0042] D: Spread the PAA / TEOS nanofiber membrane in step B evenly on the PAA modified layer in step C, keep th...

Embodiment 4

[0062] A: Use 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PDA) as monomers, and control the molar ratio of the two to 1:1. Condensation polymerization in methyl acetamide (DMAc) solvent obtains a polyamic acid (PAA) solution with a solid content of 12%. Add TEOS to the PAA solution. The quality of TEOS is that the silicon dioxide finally generated by its entire reaction accounts for the PAA thermal ring. 30% of the mass of PI after melting;

[0063] B: PAA / SiO was prepared by electrospinning PAA / TEOS solution 2 Precursor nanofibrous membrane 15 μm,;

[0064] C: The same finished PI base film as in Example 1 was etched and modified with 1mol / L KOH aqueous solution for 10 minutes, and then acidified with 1 wt% hydrochloric acid aqueous solution for 30 minutes to obtain a polyimide film with a PAA modified layer on the surface. Amine film, the thickness of the modified layer is 2 μm;

[0065] D: Spread the PAA / TEOS nanofiber membrane in step B ...

Embodiment 5

[0069] A: Use 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (PDA) as monomers, and control the molar ratio of the two to 1:1. Condensation polymerization in methyl acetamide (DMAc) solvent obtains a polyamic acid (PAA) solution with a solid content of 12%. Add TEOS to the PAA solution. The quality of TEOS is that the silicon dioxide finally generated by its entire reaction accounts for the PAA thermal ring. 30% of the mass of PI after melting;

[0070] B: PAA / SiO was prepared by electrospinning PAA / TEOS solution 2 Precursor nanofibrous membrane 35 μm,;

[0071] C: The same finished PI base film as in Example 1 was etched and modified with 1mol / L KOH aqueous solution for 10 minutes, and then acidified with 1 wt% hydrochloric acid aqueous solution for 30 minutes to obtain a polyimide film with a PAA modified layer on the surface. Amine film, the thickness of the modified layer is 2 μm;

[0072] D: Spread the PAA / TEOS nanofiber membrane in step B ...

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Abstract

A polyimide film whose surface is covered with a highly cohesive dense silicon dioxide layer, the preparation method of which is as follows: firstly, the surface of the finished polyimide film (PI) is modified to obtain a polyamic acid (PA) film with a certain thickness on the surface. PAA) modified layer of the PI film, and then the prepared PAA / silicon dioxide precursor nanofiber membrane is flattened on its surface, and then the mixed solution of the silicon dioxide precursor solution and PAA good solvent is quantitatively sprayed on it. , and then through slow hydrolysis and heat treatment to obtain a polyimide film with a high-adhesion dense silicon dioxide layer on the surface. The method of the present invention can be applied to the modification of commercialized polyimide films, and has simple implementation, good controllability, good practical application prospects, and the prepared PI / SiO 2 The thin film not only retains the original excellent performance of the finished film, but also can effectively solve the problems that the surface inorganic coating is prone to fracture, peeling, delamination, etc., and can realize the surface SiO 2 Overburden thickness is controllable. At the same time, the method has low cost, wide application range, and is easy to realize industrialized production.

Description

technical field [0001] The invention belongs to the technical field of polyimide / silicon dioxide composite technology, and in particular relates to a polyimide film whose surface is covered with a highly cohesive dense silicon dioxide layer and a 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 an aromatic heterocyclic polymer compound containing imide groups in its molecular structure. It is one ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/06C08J7/12C08J7/14C08L79/08
CPCC08J7/06C08J7/12C08J7/14C08J2379/08Y02E10/50
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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