Ethylene-tetrafluoroethylene (ETFE) copolymer porous membrane and preparation method thereof

A technology of tetrafluoroethylene and porous membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of no ETFE preparation, etc., and achieve the effects of uniform distribution, excellent high temperature resistance, and controllable pore size

Active Publication Date: 2013-12-25
南京三生境新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Ethylene-tetrafluoroethylene (ETFE) copolymer porous membrane and preparation method thereof

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Embodiment 1

[0032] The 800g weight average molecular weight is 2.5×10 6 ETFE resin, 3200g caprylic acid glycerin mixed, after mixing evenly, put into the extruder to heat and shear to dissolve, and the extrusion temperature is 280°C. The polymer homogeneous solution is extruded through a spinneret to obtain a hollow fiber membrane. Water is selected as the cooling liquid, and the temperature of the cooling bath is 80°C. The membrane filaments were extracted with methanol and then dried. The obtained hollow fiber membrane has an inner diameter of 1 mm and a wall thickness of 1 mm. The cross-sectional pore structure of the membrane is a sponge pore structure, the average pore diameter of the membrane filament is 0.8 μm, and the porosity is 65%.

Embodiment 2

[0034] The 700g weight average molecular weight is 4.1×10 5 ETFE resin, 1200g triethyl citrate, and 100g calcium carbonate are mixed. After mixing evenly, add the extruder to heat and shear to dissolve, and the extrusion temperature is 240°C. The polymer homogeneous solution is extruded through a spinneret to obtain a hollow fiber membrane. Water is selected as the cooling liquid, and the temperature of the cooling bath is 50°C. The membrane filaments were extracted with ethanol and then dried. The obtained hollow fiber membrane has an inner diameter of 1.2 mm and a wall thickness of 0.8 mm. The cross-sectional pore structure of the membrane is a sponge pore structure with an average internal pore diameter of 0.2 μm and a porosity of 58%.

Embodiment 3

[0036] The 500g weight average molecular weight is 6.2×10 5 ETFE resin, 1440g dibutyl phthalate, 60g silica mixed. After mixing evenly, add the extruder to heat and shear to dissolve, and the extrusion temperature is 245°C. The polymer homogeneous solution was cast into a flat film with a film thickness of 180 μm, and immersed in a dibutyl phthalate cooling bath at 120° C. to separate and solidify the solution to form a film. The cured flat film was extracted with trichlorethylene and dried. The membrane pore diameter is about 0.35 μm, and the porosity is 67%.

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Abstract

The invention discloses an ethylene-tetrafluoroethylene (ETFE) copolymer porous membrane and a preparation method thereof. The ETFE porous membrane comprises 10-60 wt% of ETFE resin, 20-90 wt% of diluter and 0-20 wt% of additive. The ETFE porous membrane is prepared by a thermally induced phase separation method. The preparation method comprises the following steps: uniformly mixing the ETFE resin, diluter and additive, dissolving, forming, curing, and extracting to finally prepare the ETFE porous membrane. The ETFE porous membrane prepared by the method comprises a hollow fiber membrane and a flat membrane, wherein the pore size of the membrane is 0.01-1 mu m. The ETFE porous membrane has the advantages of excellent high temperature resistance, strong acid resistance, strong alkali resistance and corrosion resistance, and is applicable to various severe water treatment environments.

Description

technical field [0001] The invention relates to a porous membrane and a preparation method thereof, more specifically to an ethylene-tetrafluoroethylene copolymer porous membrane and a preparation method thereof. Background technique [0002] Membrane separation technology is a technology that uses the selective permeability of membranes for separation and purification. The driving force of the process is mainly the pressure difference on both sides of the membrane. Compared with traditional separation technology, membrane separation technology has attracted increasing attention due to its advantages of energy saving, simple equipment, convenient operation and no pollution. [0003] The water quality of sewage is complex and changeable. Wastewater produced by many industries may contain a large amount of organic solvents, or strong acid and strong alkali, or high temperature. For example, in the electroplating industry, a large amount of alkaline wastewater is produced durin...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D67/00
Inventor 杨海军刘必前叶钢吴杰汪前东
Owner 南京三生境新材料科技有限公司
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