Preparation method of spongy-structure separation membrane with adjustable pore diameter and the separation membrane prepared by the preparation method

A separation membrane and sponge-like technology, applied in the field of membrane separation, can solve the problems of closed pores, dense skin, uneven pore size, and high energy consumption of thermal methods in membrane products, and achieve high flux, uniform pore size, and high separation accuracy Effect

Pending Publication Date: 2020-06-12
广东洁科膜分离技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present invention mainly aims at the problems of low porosity, low water flux, non-uniform pore size, high energy consumption of the thermal method, and closed pores and dense cortex of the membrane product in the wet preparation technology of the separation membrane. A method for preparing a separation membrane with a structure, the separation membrane prepared by the method has a good opening structure, uniform pore size, high separation precision, and large membrane flux

Method used

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  • Preparation method of spongy-structure separation membrane with adjustable pore diameter and the separation membrane prepared by the preparation method
  • Preparation method of spongy-structure separation membrane with adjustable pore diameter and the separation membrane prepared by the preparation method

Examples

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Effect test

Embodiment 1

[0033] The mixture of cellulose acetate, dimethylformamide, acetone and glycerin was mixed in a mass ratio of 9:46:23:12, stirred at room temperature for 12 hours to prepare a clear and transparent solution, and allowed to stand for defoaming. Control the humidity of the scraping film atmosphere to be stable at 50-60%, set the blade gap of the flat-panel scraper to 0.40 μm, start the flat-panel scraper, and run the scraper at a speed of 100 mm / s to evenly scrape the cast film on the glass plate or On the non-woven fabric, after the scraper stops running, the separation membrane is left to stand at an ambient temperature of 50°C and a humidity of 90% for evaporation and phase separation for 180s, and then the primary film is transferred to a coagulation bath (pure water) at 25°C to generate a solution Phase inversion, then rinse the product in pure water for 48 hours, and then immerse in a mixed solution with a mass ratio of water:glycerin:SDS=79.2:20:0.8 for 5-6 days and then d...

Embodiment 2

[0035] Mix the mixture of cellulose acetate, dimethylformamide, acetone and ethylene glycol at a mass ratio of 9:50:20:21, stir at room temperature for 8 hours to prepare a clear and transparent solution, and let it stand for defoaming. Control the humidity of the scraping film atmosphere to be stable at 50-60%, set the blade gap of the flat-panel scraper to 0.40 μm, start the flat-panel scraper, and run the scraper at a speed of 100 mm / s to evenly scrape the cast film on the glass plate or On the non-woven fabric, after the scraper stops running, the separation membrane is left to stand at an ambient temperature of 75°C and a humidity of 70% to evaporate and separate phases for 120s, and then transfer the primary film to a 25°C coagulation bath (pure water) to generate a solution Phase inversion, then rinse the product in pure water for 48 hours, and then immerse in a mixed solution with a mass ratio of water:glycerin:SDS=79.2:20:0.8 for 5-6 days and then dry it in the shade. ...

Embodiment 3

[0037]Mix a mixture of polyvinylidene fluoride, dimethylacetamide, polyvinylpyrrolidone, acetone and glycerin at a mass ratio of 18:54:5:18:5, stir at 50°C for 12 hours to prepare a clear and transparent solution, and let it stand to remove Bubble. Control the humidity of the scraping film atmosphere to be stable at 50-60%, set the gap between the scrapers of the flat-panel film scraper to 0.30 μm, start the flat-panel scraper, and run the scraper at a speed of 150 mm / s to evenly scrape the cast film on the glass plate or On the non-woven fabric, after the scraper stops running, the separation membrane is left to stand at an ambient temperature of 50°C and a humidity of 95% to evaporate and separate phases for 120s, and then transfer the primary film to a coagulation bath (pure water) at 25°C to generate a solution Phase inversion, then rinse the product in pure water for 48 hours, then soak for 4 hours in a mixed solution with a mass ratio of water: glycerol: sodium bisulfite...

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Abstract

The invention provides a preparation method of a spongy-structure separation membrane with an adjustable pore diameter and the separation membrane prepared by the preparation method. The specific preparation method comprises the following steps: (1) preparing a membrane casting solution containing polymer resin, volatile small molecules, a small molecule non-solvent, a water-soluble polymer and asolvent, fully mixing the components, stirring and dissolving at 20-100 DEG C, standing and defoaming for 2-24 hours; (2) preparing a membrane from the membrane casting solution through a flat membrane scraping machine or a hollow fiber spinning machine at room temperature, enabling a primary membrane or membrane filaments to enter a constant air humidity with the humidity of 50-100%, controllingthe retention time to be 0-300s under the temperature condition of 30-100 DEG C, and carrying out evaporation phase splitting; (3) immersing the membrane or membrane filament prepared by evaporation phase splitting into a coagulating bath to be cured into a membrane; and (4) treating the cured membrane with a post-treatment liquid. The cross section of the separation membrane prepared by the method is of a full-sponge structure, and the separation membrane has a good open pore structure, uniform pore diameter, high separation precision and large membrane flux.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a separation membrane, in particular to a preparation method of a sponge-like structure separation membrane whose pore size can be adjusted and the prepared separation membrane. Background technique [0002] Membrane separation technology has the functions of separation, concentration and purification, and has the characteristics of high efficiency, energy saving, environmental protection and easy control. It has been widely used in food, medicine, biology, environmental protection, chemical industry, water treatment and other fields, and has become the most advanced technology in the separation field. One of the important technical means. As the core of separation technology, ultra-microfiltration membrane is mainly prepared by non-solvent-induced phase separation and thermal-induced phase separation. The non-solvent-induced phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/08B01D71/16B01D71/34B01D71/68
CPCB01D67/0011B01D67/0013B01D67/0016B01D67/0081B01D69/087B01D2325/026B01D2325/02B01D71/68B01D71/34B01D71/16
Inventor 王建明宋宏臣
Owner 广东洁科膜分离技术有限公司
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