Method for preparing polyvinylidene fluoride flat plate microporous compound film

A technology of polyvinylidene fluoride and composite membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve the problems of increasing the average pore size and achieve energy saving, easy temperature control and large pore size.

Inactive Publication Date: 2005-06-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite membrane not only solves the problem of strength, but also can greatly increase the average pore size of the membrane

Method used

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  • Method for preparing polyvinylidene fluoride flat plate microporous compound film
  • Method for preparing polyvinylidene fluoride flat plate microporous compound film
  • Method for preparing polyvinylidene fluoride flat plate microporous compound film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Effect of Membrane Solution Concentration on Structure and Properties of PVDF Flat Composite Microporous Membrane

[0037] The proportions are respectively 8 / 5 / 87, 10 / 5 / 85, 12 / 5 / 83, 14 / 5 / 81 (wt%) polyvinylidene fluoride / polyvinylpyrrolidone / N,N-dimethylacetamide Fully stir and dissolve in the flask at about 70°C for 48 hours until the polymer is completely dissolved and the solution remains clear; filter the above-mentioned film-making solution with a Buchner funnel, then perform vacuum degassing for several hours, and stand for use. Install the PET non-woven fabric on the compound scraping film machine, adjust the linear speed controller to control the non-woven fabric's running speed to 1.5m / s; use the plug gauge to adjust the blade thickness between the scraper and the support layer to 150μm; The ambient temperature is 14.5°C. Pour the film-making solution at 25°C into the feed tank, and then scrape the film. The solution is scraped on the support layer, run in the a...

Embodiment 2

[0042] Effect of Support Layer on Membrane Properties

[0043] Polyvinylidene fluoride, polyvinylpyrrolidone, and N,N-dimethylformamide with a mass ratio of 10 / 5 / 85 were fully stirred and dissolved in a flask at about 70°C for 48 hours until PVDF was completely dissolved and the solution remained clear; The membrane solution was filtered with a Buchner funnel, then subjected to vacuum degassing for several hours, and then left to stand for use. Use PET non-woven fabric and polyester as the support layer respectively, install the support layer on the film scraping machine, adjust the line speed controller to control the cloth speed of the support layer to 1.5m / s; adjust the distance between the scraper and the support layer with a plug gauge The thickness of the knife-edge between them is 150 μm; pour the film-making solution at a temperature of 25 °C into the feed tank, and then scrape the film. The solution is scraped on the support layer, run in the air for 5 seconds, and th...

Embodiment 3

[0047] Effect of Coagulation Bath Temperature on the Structure and Properties of Polyvinylidene Fluoride Flat Composite Membrane

[0048] The preparation of the film-making solution and the scraping process are the same as in Example 1, except that the solvent used is N-methylpyrrolidone, the ambient temperature is 18°C, and the temperatures of the coagulation bath are respectively set at 10°C, 18°C, and 25°C. The measurement of the flux and the characterization by SEM are the same as in Example 1. The thickness, average pore size and water flux of the prepared composite membranes are listed in Table 4. The surface morphology of various membranes is shown in the appendix image 3 .

[0049]

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Abstract

The present invention is preparation process of plate microporous composite polyvinylidene fluoride film. The preparation process includes: mounting the support layer on composite film scraping machine and regulating the cloth speed; regulating the interval between the support layer and the scraper with plug gage; feeding filming liquid into the film scraping machine and coating the liquid to the support layer to form film, running the film in the air for some time, soaking the film in solidifying bath to form the composite film of polyvinylidene fluoride and the support layer. The composite film features large pore size, high strength and high water flux. The composite film is measured to have pore size of 0.1-1.5 micron, pure water flux of 400-2100 L/hr.sq m (at 0.1MPa), thickness of 150-220 microns, radial tensile strength of 35.2 MPa, radial elongation at breaking of 51.92 %, transverse tensile strength of 18.2 MPan and transverse elongation at breaking of 68.7 %.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride flat microporous composite membrane. Background technique [0002] Polyvinylidene fluoride is a fluorine-containing multifunctional material obtained by homopolymerization or copolymerization of vinylidene fluoride monomer. It is a linear crystalline polymer, and its crystallinity is generally between 55% and 80%. Due to the high binding energy of the fluorocarbon chain, it has good heat resistance and corrosion resistance. The applicable temperature range is -40~150 ° C. It can resist oxidants, acids, alkalis, salts, halogens, aromatics, aliphatic hydrocarbons and chlorine. Corrosion and swelling of substitute solvents, has excellent anti-ultraviolet and aging resistance, and has the characteristics of non-polarity and anti-pollution. In particular, this material is soluble in dimethyl sulfoxide, N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone, triethyl pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/34
Inventor 徐又一左丹英朱宝库刘富
Owner ZHEJIANG UNIV
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