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Porous polyvinylidene blending porous membrane and process for producing same

A polyvinylidene fluoride, porous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high manufacturing cost, low efficiency, complex process, etc. Low consumption and improved compatibility

Inactive Publication Date: 2007-08-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reported hydrophilic PVDF membrane, the European patent EP1339777 has made good use of this principle, but the atom transfer radical polymerization method used in this patent has low efficiency of grafting POEM and PMAA on the PVDF raw material, and the process is complicated. Membranes are expensive to manufacture

Method used

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  • Porous polyvinylidene blending porous membrane and process for producing same
  • Porous polyvinylidene blending porous membrane and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0066]The PVDF blend flat plate and tubular porous membrane with outstanding hydrophilicity of the present invention, the main components are PVDF, fluorine-containing carbon chain two-block amphiphilic polyethylene oxide and inorganic particles, the objective essence of its preparation method The above is to realize the effective control of the content of the above three components, the distribution of components in the membrane body and the membrane pore structure (mainly pore size and porosity). The preparation method of the membrane is realized through three main steps of preparation of membrane-forming liquid, phase inversion to form a film, and cleaning and drying, among which the preparation of membrane liquid and phase inversion to form a film are key steps.

[0067] Membrane solution preparation refers to mixing PVDF, amphiphilic polyethylene oxide containing fluorocarbon chains, inorganic particles, pore size regulators and solvents, fully stirring at 50-90°C for 24-4...

Embodiment 1

[0089] The implementation steps of preparing polyvinylidene fluoride blended flat porous membrane:

[0090] (1) Preparation of film-making solution: Stir polyvinylidene fluoride, amphiphilic polyethylene oxide, inorganic particles, pore size regulator, and solvent at 70°C for 24 hours, and degas to obtain a film-making solution. The mass percentage of component is:

[0091] Polyvinylidene fluoride (PVDF): FR904, 10%;

[0092] Amphiphilic polyethylene oxide (PTFE-b-PEG): the structure is CF 3 (CF 2 ) x -O-(CH 2 CH 2 O) y -H, fluorine-containing carbon chain two-block polyethylene oxide with a molecular weight of 725, 1%;

[0093] Inorganic particles: titanium dioxide (TiO2) with a particle size of 50 nm 2 ),1%;

[0094] Pore ​​size regulator: molecular weight is polyethylene oxide (PEG) of 600, 3%;

[0095] Solvent: N, N-dimethylacetamide (DMAc), 85%;

[0096] (2) Film formation by scraping: Scrape the film-making solution at 70°C on the flat carrier to form a nascen...

Embodiment 2

[0105] The implementation steps are as in Example 1, and the various implementation conditions and the structure and performance of the obtained PVDF blended flat porous membrane are shown in Table 2.

[0106] Table II:

[0107]

[0108] to dry

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Abstract

The invention discloses a plate-tubular porous membrane based on polyvinylidene fluoride mixture, and relative production. The membrane substantially comprises polyvinylidene fluoride, dual-block amphipathic epoxyethane, and inorganic particles. And the preparation comprises that mixing polyvinylidene fluoride, dual-block amphipathic epoxyethane, inorganic particles, aperture adjusting agent and polarity solvent to obtain the membrane preparing liquid, using said membrane preparing liquid into plate or tubular liquid membrane, immerging the liquid membrane into solidifying bath mainly comprising water to be solidified into plate or tubular membrane. And the apertures of plate membrane and tubular membrane are 0.01-5.0 and 0.01-0.2 micrometers. The hydrophilic chain section of amphipathic epoxyethane is abundant at the face or aperture walls of the membrane, while said two membranes are both better in hydrophilic property and permeable property, with significant resistance on organic adsorption, to be used as ultra-filter membrane and micro-filter membrane in membrane water treatment.

Description

technical field [0001] The invention belongs to the technical field of membranes, in particular to polyvinylidene fluoride blend plate and tube porous membrane materials and their preparation methods. Background technique [0002] Membrane separation technology is a new type of separation technology, which has the advantages of low energy consumption, good separation performance, and no secondary pollution. It is of great significance in the fields of medicine, chemical industry, energy, food, environmental protection, and water resources. It represents the separation technology direction of development. Membrane materials are the starting point and core of membrane separation technology, as well as the direction and focus of research and development of membrane separation technology. Separation membrane materials are mostly polymers, mainly modified fibers, polysulfone, polyolefin, polyamide, polycarbonate, acrylic acid copolymer, fluoropolymer, etc. Microporous membranes ...

Claims

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Application Information

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IPC IPC(8): B01D71/34
Inventor 朱宝库肖玲杜春慧徐又一陈良刚
Owner ZHEJIANG UNIV
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