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Polyimide film with surface coated with high-cohesiveness compact silicon dioxide layer and preparation method of polyimide film

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

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

[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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  • Polyimide film with surface coated with high-cohesiveness compact silicon dioxide layer and preparation method of polyimide film
  • Polyimide film with surface coated with high-cohesiveness compact silicon dioxide layer and preparation method of polyimide film
  • Polyimide film with surface coated with high-cohesiveness compact silicon dioxide layer and preparation method of polyimide film

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

The invention relates to a preparation method of a polyimide film with the surface coated with a high-cohesiveness compact silicon dioxide layer. The preparation method comprises the steps that: the surface of a finished product polyimide film (PI) is modified, so that a PI film with the surface being a polyamide acid (PAA) modified layer with a certain thickness is obtained; a prepared PAA / silicon dioxide precursor nanofiber film is flatly spread on the surface layer of the PI film; a mixed solution composed of a silicon dioxide precursor solution and a PAA good solvent is quantitatively sprayed on the PI film; slow hydrolysis and heat treatment are carried out to obtain the polyimide film with the surface coated with the high-cohesiveness compact silicon dioxide layer. The method disclosed by the invention can be applied to modification of a commercial polyimide film, is simple to implement, good in controllability and good in practical application prospect; the prepared PI / SiO2 film not only retains the original excellent performance of a finished product film, but also can effectively assist in solving the problems that a surface inorganic coating is easy to break, fall off, layer and the like, and can realize controllable surface SiO2 coating thickness. Meanwhile, the method is low in cost, wide in application range and easy to realize industrial 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 Applications(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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