Attapulgite/polyvinylidene fluoride nano-composite ultra-filtration membrane and preparation method thereof

A technology of polyvinylidene fluoride and polyvinylidene fluoride resin, which is applied in the field of attapulgite/polyvinylidene fluoride nanocomposite ultrafiltration membrane and its preparation, can solve the problems of difficult dispersion, limited scale application, and high preparation cost. To achieve the effect of improving dispersion

Active Publication Date: 2014-12-17
HUAIYIN TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, artificially synthesized one-dimensional nanomaterials such as carbon nanotubes have high preparation costs, low purity and yield, and are difficult to disperse, which greatly limits their large-scale application in membrane blending modification.

Method used

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  • Attapulgite/polyvinylidene fluoride nano-composite ultra-filtration membrane and preparation method thereof
  • Attapulgite/polyvinylidene fluoride nano-composite ultra-filtration membrane and preparation method thereof
  • Attapulgite/polyvinylidene fluoride nano-composite ultra-filtration membrane and preparation method thereof

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preparation example Construction

[0038] The preparation method of the ultrafiltration membrane can be obtained by a common phase inversion method, and after the phase inversion of the cast membrane liquid in the coagulation liquid, an ultrafiltration membrane with a microporous structure can be obtained.

[0039] In the above method, the coagulation liquid is used as a non-solvent, and examples thereof include water; aliphatic hydrocarbons such as hexane, pentane, and trichloroethylene; aromatic hydrocarbons such as benzene and toluene; and mixed solvents thereof. When polyvinylidene fluoride is used as a polymer raw material, water is usually preferably used as the non-solvent of the coagulation bath, but it is not particularly limited as long as it does not dissolve polyvinylidene fluoride. The membrane morphology of the obtained microporous support membrane changes depending on the composition of the polymer solution, and accordingly, the membrane formability of the composite semipermeable membrane also cha...

Embodiment 1

[0048] Add 1 gram of nano-attapulgite to 80 grams of triethyl phosphate, after vigorous mechanical stirring and ultrasonic treatment, add 20 grams of polyvinylidene fluoride powder, stir and dissolve at 80 ° C for 24 hours, and then add 5 grams Polyethylene glycol was stirred for 12 hours to obtain the casting solution, which was left to defoam at 80°C for 24 hours, and the immersion precipitation phase inversion method was adopted. The conditions were: the air dry distance was 0 cm; the flow rate of the casting solution was 2 mL / min; It is deionized water with a flow rate of 2mL / min; the coagulation bath is deionized water with a water temperature of 20-30°C to prepare an attapulgite / polyvinylidene fluoride nanocomposite hollow fiber ultrafiltration membrane with a membrane thickness of about 200 μm. The outer diameter is about 1.0 mm. It has been determined that the pure water flux at 0.1MPa and 20°C is 160 L / (m 2 h) with dextran as the standard substance, its molecular we...

Embodiment 2

[0054] Add 0.1, 0.5, 1, 1.5, 2 grams of nano-attapulgite to 85 grams of triethyl phosphate, after vigorous mechanical stirring and ultrasonic treatment, add 15 grams of polyvinylidene fluoride powder and stir at 80 ° C Dissolved for 24 hours, then added 5 grams of polyethylene glycol and stirred for 12 hours to obtain a casting solution, left to defoam at 80°C for 24 hours, and adopted the immersion precipitation phase inversion method, the conditions were: the air dry distance was 0 cm; the casting solution The flow rate is 2mL / min; the core liquid is deionized water, and the flow rate is 2mL / min; the coagulation bath is deionized water, and the water temperature is 20~30°C, and the attapulgite / polyvinylidene fluoride nanocomposite hollow fiber ultrafiltration membrane. Under the conditions of different nano-attapulgite additions, the membrane performance data are shown in the table below:

[0055]

[0056] It can be seen from the table that controlling the addition of na...

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Abstract

The invention discloses an attapulgite/polyvinylidene fluoride nano-composite ultra-filtration membrane and a preparation method thereof. The preparation method comprises the following steps: adding a certain amount of nano attapulgite into triethyl phosphate selected as a solvent; carrying out fierce mechanical agitation and ultrasonic treatment and adding polyvinylidene fluoride powder; agitating until the powder is dissolved; adding polyethylene glycol and agitating uniformly to obtain a membrane casting solution; and preparing the attapulgite/polyvinylidene fluoride nano-composite ultra-filtration membrane by taking water as a condensation bath through the adoption of an immersion precipitated phase conversion method. According to the attapulgite/polyvinylidene fluoride nano-composite ultra-filtration membrane disclosed by the invention, the nano attapulgite is guided into a polyvinylidene fluoride ultra-filtration membrane, and a unique nano fiber structure of the attapulgite and a three-dimensional net-shaped structure formed by the attapulgite and polyvinylidene fluoride are utilized, so that the structure and the strength of the polyvinylidene fluoride ultra-filtration membrane are effectively improved; and meanwhile, the permeability, the hydrophily and the anti-pollution capability of the polyvinylidene fluoride ultra-filtration membrane are improved by utilizing the high hydrophily of the attapulgite.

Description

[0001] technical field [0002] The invention relates to an attapulgite / polyvinylidene fluoride nanocomposite ultrafiltration membrane and a preparation method thereof, belonging to the technical field of membrane separation materials. [0003] Background technique [0004] Polyvinylidene fluoride (PVDF) has excellent properties such as high strength corrosion resistance, chemical resistance, high temperature resistance, and oxidation resistance. Due to its good flexibility, PVDF has been widely used to prepare hollow fiber ultrafiltration membrane materials. However, polyvinylidene fluoride has low surface energy and strong hydrophobicity, resulting in relatively high water penetration resistance, which limits its application in aqueous phase separation systems; at the same time, hydrophobicity also makes the membrane susceptible to contamination, deteriorating its separation performance, and directly affects the economy of the membrane separation process. Therefore, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/12B01D67/00
Inventor 周守勇赵宜江薛爱莲张艳蔡健健李梅生张莉莉褚效中邢卫红
Owner HUAIYIN TEACHERS COLLEGE
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