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Multi-layer porous polyimide film and preparation method of porous polyimide film
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A technology of polyimide film and porous polyimide layer, which is applied in the field of multi-layer structure porous polyimide film and its manufacturing, can solve the problems of low film strength, poor reliability, and low service life, and achieve Good integrity, low resistance, and easy implementation
Active Publication Date: 2015-05-27
GUILIN ELECTRICAL EQUIP SCI RES INST
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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
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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 Structure 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:...
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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
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