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Polyvinylidene fluoride ultrafiltration membrane and ultrafiltration membrane method

A polyvinylidene fluoride and ultrafiltration membrane technology, which is applied in chemical instruments and methods, membrane technology, and semipermeable membrane separation, can solve problems such as short life, poor strength, and easy breakage, and achieve strong production line adaptability and preparation The effect of simple process

Inactive Publication Date: 2012-07-18
江苏英超环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventionally produced polyvinylidene fluoride porous membrane without reinforcement has poor strength, generally only up to 30N, easy to break during use, and has a short lifespan. Generally, it can only guarantee a service life of several months.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of gel solution: take 80% methanol and 20% isobutyl ketone by weight, add to a mixer and stir, heat to make a homogeneous solution, filter to remove particles above 5 microns, vacuum remove dissolved Air, and finally keep warm at 20°C for later use.

[0027] Preparation of casting solution: 5% by weight of polyvinylidene fluoride monomer, 94% of N-methylpyrrolidone and 1% of MASURF FS-1700 (provided by MASON Chemical in the United States) were mixed for use.

[0028] Membrane preparation: pass the casting solution into a vacuum fiber scraping mold to make a wet film with a thickness of 1mm; at 40°C, immerse the wet film in a precipitation tank filled with gel liquid to make a phase transition; The obtained membrane was dried to form a porous dry membrane having a thickness of 0.08 mm and an average pore diameter of 0.02 μm.

Embodiment 2

[0030] Preparation of gel solution: take 85% ethanol and 15% formamide by weight, add to a mixer and stir, heat to make a homogeneous solution, filter to remove particles above 5 microns, and vacuum to remove dissolved air. Finally, keep warm at 30°C for later use.

[0031] The preparation of film-casting liquid: get the FLUORORAD FC-170-C (U.S. 3M) mixed for use.

[0032]Membrane preparation: pass the casting solution into a vacuum fiber scraping mold to make a wet film with a thickness of 0.8mm; at 30°C, the wet film is immersed in a precipitation tank filled with gel liquid to make it undergo phase transition to form a film; The obtained membrane was dried to form a porous dry membrane having a thickness of 0.1 mm and an average pore diameter of 2 μm.

Embodiment 3

[0034] Preparation of gel solution: take 90% isopropanol and 10% cyclohexanone by weight, add to a mixer and stir, heat to make a homogeneous solution, filter to remove particles above 5 microns, vacuum remove dissolved Air, and finally keep warm at 40°C for use.

[0035] Preparation of casting solution: take weight percentage as 25% polyvinylidene fluoride copolymer, 64% dimethylacetamide, 10% isophorone and 1% MASURF FS-1700 (provided by American MASON chemical industry) Mix and set aside.

[0036] Membrane preparation: pass the casting solution into the vacuum fiber scraping mold to make a wet film with a thickness of 0.5mm; at 20°C, the wet film is immersed in a precipitation tank filled with gel liquid to make it undergo phase transition to form a film; The obtained membrane was dried to form a porous dry membrane having a thickness of 0.1 mm and an average pore diameter of 5 μm.

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Abstract

The invention discloses a polyvinylidene fluoride ultrafiltration membrane, which comprises cast membrane liquid and gel liquid. The cast membrane liquid comprises 5-40% of polyvinylidene fluoride monomer or copolymer, 50-94% of a solvent, 0-10% of cosolvent and 0.001-1% of a surface active agent according to percentage by weight. The gel liquid comprises 80-100% of a nonsolvent and 0-20% of the cosolvent according to percentage by weight. Meanwhile, the invention further discloses a preparation method for the polyvinylidene fluoride ultrafiltration membrane. The polyvinylidene fluoride ultrafiltration membrane is even in membrane pore, fast in flow speed, large in flow quantity, simple in preparation process and strong in adaptability of a production line.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a solution for preparing polyvinylidene fluoride ultrafiltration membranes. Background technique [0002] Microporous membranes or membranes (MEMBRANE) generally refer to thin films that are essentially uniform in thickness but porous. These voids are interconnected to form tortuous channels through both sides of the membrane. If a certain pressure is applied, a fluid such as a liquid or a gas can flow from one side of the membrane layer to the other side through these curved channels. If the fluid contains solid particles or larger molecules pass through the porous membrane, the solid particles or macromolecules whose particle size is larger than the minimum pore size of the membrane cannot pass through the membrane and are trapped, so that they can be separated from the fluid. Since this separation process does not involve latent heat of phase change, the energy c...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00
Inventor 余志强
Owner 江苏英超环保有限公司
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