Polyester flat microporous membrane and preparation method thereof

A technology of microporous membrane and polyester, which is applied in the field of polyester flat microporous membrane and its preparation, can solve the problems such as no polyester porous membrane has been found, and achieve the effects of highlighting anti-pollution, long cleaning cycle and narrow pore size distribution

Inactive Publication Date: 2011-03-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report identical with the polyester porous membrane disclosed by the present invention or its preparation method.

Method used

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  • Polyester flat microporous membrane and preparation method thereof
  • Polyester flat microporous membrane and preparation method thereof
  • Polyester flat microporous membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0057] The steps of a preparation method of a polyester flat microporous membrane are:

[0058] 1) The polyester with a mass percentage of 10-49.9%, the modifier with a mass percentage of 0.1-20%, and the diluent with a mass percentage of 50-89.9% are mixed at 200-300°C Membrane solution;

[0059] 2) Scraping the film-forming solution on a stainless steel carrier or a glass carrier to form a liquid film with a thickness of 40-600 microns, and immersing it in a coagulation bath at 0-100°C to solidify into a precursor film;

[0060] 3) immersing the precursor membrane in an extractant at 0-50° C. for 24-48 hours, and drying to obtain a flat polyester microporous membrane.

[0061] The steps of the preparation method of another kind of polyester flat microporous membrane are:

[0062] 1) The polyester with a mass percentage of 10-49.9%, the modifier with a mass percentage of 0.1-20%, and the diluent with a mass percentage of 50-89.9% are mixed at 200-300°C Membrane solution; ...

Embodiment 1

[0072](1) Preparation of film-making solution: polyethylene terephthalate (molecular weight: 100,000), diphenyl ether, and polymethacrylate derivatives (molecular weight: 50,000) were mixed at 200 with a ratio of 49.9:50:0.1 Mix uniformly at ~300°C to obtain a membrane-forming solution.

[0073] (2) Precursor film formation: Scrape the film-forming solution at 200-300°C on the carrier at 200°C to form a liquid film of 50-600 microns, and immerse the carrier with the liquid film in water to solidify it into a precursor film.

[0074] (3) Extraction to form pores: soak the precursor membrane in absolute ethanol at 50° C. for 24 hours, take it out and dry it to obtain the polyester flat microporous membrane.

[0075] Each implementation condition and the structure and performance of the obtained polyester flat microporous membrane are as shown in Table 1.

[0076] Table 1

[0077]

Embodiment 2

[0079] The preparation steps are the same as in Example 1, and the various implementation conditions and the structure and properties of the obtained polyester flat microporous membrane are shown in Table 2.

[0080] Table 2

[0081]

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Abstract

The invention discloses a polyester flat microporous membrane and a preparation method thereof. The microporous membrane comprises the following materials in percentage by mass: 60-99.9% of polyester and 0.1-40% of modifier; or 20-40% of non-woven fabric, 60-79.9% of polyester and 0.1-30% of modifier. The preparation method is realized on the basis of a thermally induced phase separation process and comprises the following steps: mixing the polyester, the modifier and diluter into a homogeneous solution at high temperature; scraping the homogeneous solution into a liquid membrane, cooling andcuring into a membrane so as to form a precursor membrane subject to microphase separation, and extracting to obtain a flat microporous membrane. The prepared polyester flat microporous membrane is in a spongeous structure with the pore diameter of 0.05-5.0 micrometers and the porosity of 30-80%, and has the advantages of narrow pore diameter distribution, uniform pore size, easily controlled pore size, high strength, symmetrical structure and the like, thereby being a filter membrane material for water treatment and a lithium ion battery diaphragm material with high performance, low cost andlong life.

Description

technical field [0001] The invention relates to the fields of separation membrane materials and lithium-ion battery diaphragm materials, in particular to a flat polyester microporous membrane and a preparation method thereof. Background technique [0002] Due to the advantages of high efficiency, simple equipment, convenient operation, energy saving and environmental protection, membrane separation technology has shown great application potential in the industrial field, and its application range has been extended to biology, medicine, environmental protection, energy, seawater desalination, wastewater treatment, etc. field. Membrane materials are the core basic materials of membrane separation technology. Among them, ultrafiltration membranes and microfiltration membranes are the most widely used microporous membrane materials. Among the two types of membrane materials, inorganic membranes (mainly ceramic membranes and metal membranes) and organic polymers, polymer membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/48B01D69/06H01M2/18H01M50/403H01M50/414H01M50/463H01M50/489H01M50/491
CPCY02E60/12Y02E60/10
Inventor 朱宝库梁治樱姚之侃石俊黎
Owner ZHEJIANG UNIV
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