Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Multi-layer porous polyimide film and preparation method of porous polyimide film

A technology of polyimide film and multi-layer structure, applied in the direction of chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of low service life, low film strength, poor reliability, etc., and achieve resistance Small, holistic, and easy-to-implement effects

Active Publication Date: 2012-07-18
GUILIN ELECTRICAL EQUIP SCI RES INST
View PDF6 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the thickness of the porous polyimide film is less than 15 microns, the strength of the film is too low, the reliability in use is poor, and the service life is too low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi-layer porous polyimide film and preparation method of porous polyimide film
  • Multi-layer porous polyimide film and preparation method of porous polyimide film
  • Multi-layer porous polyimide film and preparation method of porous polyimide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This example is a double-layer structure porous polyimide film, such as figure 1 Shown consists of one layer of macroporous polyimide layer 1 and one layer of small hole polyimide layer 2 .

[0035] The pores contained in the macroporous polyimide layer 1 have an average pore diameter of 3 microns and a thickness of 50 microns, and the pores contained in the small-porous polyimide layer 2 have an average pore diameter of 0.10 microns and a thickness of 3 microns.

Embodiment 2

[0037] This example is a three-layer structure porous polyimide film, such as figure 2 As shown, it consists of two layers of macroporous polyimide layer 1 sandwiching a layer of small hole polyimide layer 2.

[0038] The macroporous polyimide layer 1 of two outer layers wherein is identical, and the average pore diameter of the hole contained in it is 5 microns, and the thickness is 30 microns, and the average pore diameter of the hole contained in the small-porous polyimide layer 2 is 0.01 micron, The thickness is 1 micron.

Embodiment 3

[0040] This example is a three-layer structure porous polyimide film, such as image 3 As shown, it consists of two layers of macroporous polyimide layer 1 sandwiching a layer of small hole polyimide layer 2.

[0041] The macroporous polyimide layer 1 of two outer layers wherein is different, and the average aperture diameter of wherein one layer contains is 4 microns, and thickness is 30 microns, and the average aperture diameter that another layer contains is 0.5 microns, and thickness is 20 microns. micron, the pores contained in the small-porous polyimide layer 2 have an average pore diameter of 0.05 micron and a thickness of 2 micron.

[0042] Example 1 of the Manufacturing Method of Multilayer Porous Polyimide Film

[0043] This example is the manufacturing method of the above-mentioned multilayer structure porous polyimide film embodiment 1

[0044] Specific steps are as follows:

[0045] I. Preparation

[0046] Weigh two spare parts,

[0047] The first is:

[0048]...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
thicknessaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a multi-layer porous polyimide film and a preparation method of the porous polyimide film. The film comprises a large-hole layer and a small-hole layer or is formed in the way that one small-hole layer is sandwiched between two large-hole layers, wherein the large-hole layer is 0.15-6 microns in hole diameter and 5-100 microns in thickness, and the small-hole layer is 0.01-0.15 microns in hole diameter and 1-5 microns in thickness. The preparation method of the film comprises the following steps of: synthesizing two or three kinds of composite polyamide resin solution, by using dianhydride, diamine and two or three kinds of pore-forming materials with different granularities; carrying out composite salivating to form a two / three-layer film, carrying out two-way stretch and imidization, pickling the film for removing the pore-forming materials, thus obtaining the multi-layer porous polyimide film. The molar ratio of dianhydride to diamine is 1:1, and the mass of the pore-forming materials is 0.25-2 times that of dianhydride and diamine. Various media can conveniently pass through the large-hole layer of the film and the strength of the film is ensured; the small-hole layer can be thinned to 1 micron and the transmittance is good. According to the method, the porosity and hole diameter of all layers in the film can be easily controlled, and the method is suitable for preparing porous film products.

Description

(1) Technical field [0001] The invention relates to a porous film manufacturing technology, in particular to a porous polyimide film with a multilayer structure and a manufacturing method thereof. (2) Background technology [0002] Porous membranes can be used as filter membranes, separation membranes and battery separators, etc. The performance of porous membranes determines the quality of related products. [0003] Polyimide has excellent performance, high heat resistance, and its melting point is higher than the decomposition temperature. Porous polyimide film has been put into use for a long time. However, when the thickness of the porous polyimide film is less than 15 microns, the strength of the film is too low, the reliability in use is poor, and the service life is too low. To ensure the strength of the film, it must have a certain thickness, so the thickness of the porous polyimide film is generally 15 to 25 microns. The increase in thickness is to lengthen the ch...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B32B3/24B32B27/28
Inventor 李耀星梁亚东陈求索龙丹
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com