Method for preparing super-hydrophilic PVDF ultrafiltration membrane through one-pot process

An ultrafiltration membrane and superhydrophilic technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of low raw material utilization rate and complicated preparation process, and achieve reduction of industrial waste water and energy consumption, simple process, Strong anti-pollution effect

Inactive Publication Date: 2020-04-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to propose a method for preparing ultra-hydrophilic PVDF ultrafiltration membranes by a one-pot method for the problems of complex preparation process and low raw material utilization rate of traditional grafted modified hydrophilic ultrafiltration membranes.

Method used

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  • Method for preparing super-hydrophilic PVDF ultrafiltration membrane through one-pot process
  • Method for preparing super-hydrophilic PVDF ultrafiltration membrane through one-pot process
  • Method for preparing super-hydrophilic PVDF ultrafiltration membrane through one-pot process

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Embodiment 1

[0032]According to mass percentage, 6% of hydrophilic monomer acrylic acid and 12% of alkalized polyvinylidene fluoride, and 3% of polyvinylpyrrolidone with a molecular weight of 20,000 to 50,000, 3% of anhydrous lithium chloride, 75 % N,N-dimethylformamide was mixed, stirred and dissolved at 60°C, 1% azobisisobutyronitrile was added, and the temperature was raised to 80°C for polymerization. After reacting for 2 hours, lower the temperature to 40°C, stop the polymerization, let it stand for 6 hours to defoam, and prepare the grafting reaction mixed solution; directly scrape the grafting reaction mixed solution into a polymer solution film with a thickness of 250 μm by hand or by a flat film scraping machine , after pre-evaporating at room temperature for 15 seconds, put it into a coagulation bath of sodium hydroxide solution at 60°C and pH 13, and take it out after 2 minutes of phase separation. Repeated washing with deionized water removes residual solvents and impurities, a...

Embodiment 2

[0037] According to mass percentage, 6% of hydrophilic monomer acrylic acid and 12% of alkalized polyvinylidene fluoride, and 5% of polyethylene glycol with a molecular weight of 10,000 to 20,000, 3% of anhydrous lithium chloride, 73% of N-methyl-2-pyrrolidone was mixed, stirred and dissolved at 60°C, 1% of benzoyl peroxide was added, and the temperature was raised to 90°C for polymerization. After reacting for 1 hour, lower the temperature to 40°C, stop the polymerization, let it stand for 6 hours to defoam, and prepare the grafting reaction mixture solution; directly scrape the grafting reaction mixture solution into a polymer solution film with a thickness of 250 μm by hand or by a flat film scraping machine , after pre-evaporating at room temperature for 15 seconds, put it into a coagulation bath of sodium hydroxide solution at 50°C and pH 13, and take it out after 2 minutes of phase separation. Repeated washing with deionized water removes residual solvents and impurities...

Embodiment 3

[0043] According to mass percentage, 5% of hydrophilic monomer acrylic acid and 10% of alkalized polyvinylidene fluoride, and 3% of polyvinylpyrrolidone with a molecular weight of 20,000 to 50,000, 1% of anhydrous lithium chloride, 80 % N,N-dimethylacetamide was stirred and dissolved at 60°C, 1% azobisisobutyronitrile was added, and the temperature was raised to 80°C for polymerization. After reacting for 3 hours, lower the temperature to 40°C, stop the polymerization, let it stand for 6 hours to defoam, and prepare the grafting reaction mixed solution; directly scrape the grafting reaction mixed solution into a 200 μm thick polymer solution film by hand or by a flat scraper , after pre-evaporating at room temperature for 15s, put it into a coagulation bath of sodium hydroxide solution at 20°C and pH 13, and take it out after 2 minutes of phase separation. Repeated washing with deionized water removes residual solvents and impurities, and a one-pot method for preparing PVDF ul...

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Abstract

The invention discloses a method for preparing a super-hydrophilic PVDF ultrafiltration membrane through a one-pot process. The method comprises the following steps: mixing and dissolving 3%-9% of hydrophilic monomer acrylic acid, 10%-14% of alkalized polyvinylidene fluoride, 2%-8% of a high-molecular compatibilizer, 1%-5% of anhydrous lithium chloride and 68%-80% of an organic solvent, adding 1%of an initiator, carrying out heating for polymerization, standing and defoaming to prepare a grafting reaction mixed solution; preparing a polymer solution film with a certain thickness from the mixed solution; and performing pre-evaporation at room temperature, carrying out phase splitting treatment in a coagulating bath so as to obtain the super-hydrophilic PVDF ultrafiltration membrane prepared through the one-pot process. The super-hydrophilic PVDF ultrafiltration membrane has higher hydrophilicity and stronger anti-pollution performance, can be applied to industrial application of separation of water bodies with high contents of hydrophobic pollutants such as oil-water mixtures and secondary effluent of domestic sewage, and is a scientific and efficient super-hydrophilic PVDF ultrafiltration membrane production technology.

Description

technical field [0001] The invention belongs to the field of membrane preparation, and in particular relates to a one-pot method for preparing superhydrophilic PVDF ultrafiltration membranes and a preparation method thereof. Background technique [0002] As an efficient separation, concentration, purification and purification technology, ultrafiltration technology has been widely used in food, medicine, environmental protection, petrochemical, energy and other fields, and has become an important means to solve the current chemical separation and water resource regeneration. Compared with the harsh production process and high price of inorganic membranes, polymer-based ultrafiltration membranes occupy an important position and role in the field of membrane industry production due to the advantages of easy availability of raw materials, convenient preparation, and low price. However, during the application of polymer-based ultrafiltration membranes, due to the behavior of vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D61/14B01D67/00
CPCB01D61/145B01D67/0002B01D69/02B01D71/34B01D2325/36
Inventor 王磊赵杨孟晓荣张建涛王旭东樊瑛陈嘉智吕永涛
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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