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Easy-to-wash PVDF (polyvinylidene fluoride) ultrafiltration membrane and preparation method thereof

A technology of polyvinylidene fluoride and polyvinylidene fluoride powder, which is applied in the field of easy-to-clean polyvinylidene fluoride ultrafiltration membrane and its preparation, can solve the problems of high cost, poor compatibility, and easy agglomeration, and achieve high The effect of specific surface area, large reserves and low cost

Active Publication Date: 2015-10-14
HUAIYIN TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the specific surface area of ​​inorganic nanoparticles is large, so they are easy to aggregate together, and the compatibility of hydrophilic inorganic nanoparticles with polymer membrane materials is poor.
Traditional inorganic nanoparticles (Al 2 o 3 ,TiO 2 etc.) are prone to fall off during membrane preparation and use, which affects the performance and modification effect of the membrane
One-dimensional nanomaterials such as carbon nanotubes can improve their stability through the entanglement of polymer chains, but the cost is relatively high

Method used

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  • Easy-to-wash PVDF (polyvinylidene fluoride) ultrafiltration membrane and preparation method thereof
  • Easy-to-wash PVDF (polyvinylidene fluoride) ultrafiltration membrane and preparation method thereof
  • Easy-to-wash PVDF (polyvinylidene fluoride) ultrafiltration membrane and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0032] The raw materials for preparing the ultrafiltration membrane include the following components: polyvinylidene fluoride powder, organic solvent, poly-N-isopropylacrylamide modified attapulgite, additives, and coagulation bath.

[0033] The organic solvent here refers to a solvent capable of dissolving polyvinylidene fluoride powder, such as: N-methyl-2-pyrrolidone, tetrahydrofuran, dimethyl sulfoxide; amides such as dimethylacetamide and dimethylformamide ; Ester solvents such as trimethyl phosphate or triethyl phosphate; Lactone solvents such as γ-butyrolactone; and their mixed solvents.

Embodiment 1

[0047] Example 1 Preparation of polyvinylidene fluoride / modified attapulgite mixed matrix ultrafiltration membrane

[0048] Add 4g of attapulgite modified by silane coupling agent KH-570 into the three-necked flask (see patent document 104128100A for the preparation method), then add 50mL of water, ultrasonically disperse until uniform, and then add the initiator azobisisobutyl Nitrile 0.2g, monomer N-isopropylacrylamide 0.6g, react at 70°C for 12 hours, the reaction product is centrifuged and washed with deionized water and absolute ethanol several times to remove excess reactants, and then vacuum dried Grinding and sieving to obtain attapulgite modified by poly-N-isopropylacrylamide.

[0049] Then respectively add 1%, 4%, 7% (relative to the mass of polyvinylidene fluoride powder) of the modified attapulgite prepared above into 48g of triethyl phosphate, after ultrasonic dispersion is uniform, add 12g of polyvinylidene fluoride Stir and dissolve the vinylidene fluoride powd...

Embodiment 2

[0054] Example 2 Preparation of polyvinylidene fluoride / modified attapulgite mixed matrix ultrafiltration membrane

[0055] Add 4g of silane coupling agent A-150 (vinyltrichlorosilane), A-151 (vinyltriethoxysilane), and KH-570 modified attapulgite in the three-necked flask (for the preparation method, refer to Patent document 104128100A), then add 50mL of water, ultrasonically disperse until uniform, then add in turn 0.3g of initiator azobisisobutyronitrile, 0.5g of monomer N-isopropylacrylamide, react at 75°C for 8 hours, the reaction product After centrifugation, it is washed with deionized water and absolute ethanol several times to remove excess reactants, and then vacuum-dried, ground and sieved to obtain poly-N-isopropylacrylamide-modified attapulgite.

[0056] Then add 4% (relative to the quality of polyvinylidene fluoride powder) of the modified attapulgite prepared above into 42 g of triethyl phosphate, and after ultrasonic dispersion is uniform, add 15 g of polyvinyl...

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Abstract

The invention discloses an easy-to-wash PVDF (polyvinylidene fluoride) ultrafiltration membrane and a preparation method thereof. The preparation method comprises the following steps: with triethyl phosphate as a solvent, ultrasonically dispersing a certain amount of poly N-isopropylacrylamide modified attapulgite in the solvent, adding PVDF powder and stirring violently till the PVDF powder is dissolved, adding a pore-foaming agent, namely polyethylene glycol, and uniformly stirring, and finally standing for defoaming to obtain a membrane casting solution; with water as a coagulating bath, preparing the ultrafiltration membrane by using an immersion precipitation phase conversion method. By introducing the poly N-isopropylacrylamide modified attapulgite into the PVDF ultrafiltration membrane, the unique nano-fiber structure of the attapulgite and the three-dimensional net structure formed by PVDF can be used to effectively improve the structure and strength of a pure PVDF ultrafiltration membrane, and the high hydrophilicity of the attapulgite is used to improve the permeability and hydrophilicity of the membrane; meanwhile, the ultrafiltration membrane also has the temperature sensitivity of poly N-isopropylacrylamide, and anti-pollution and easy-to-wash properties are realized.

Description

technical field [0001] The invention relates to an easy-to-clean polyvinylidene fluoride ultrafiltration membrane and a preparation method thereof, belonging to the technical field of membrane separation materials. Background technique [0002] Polyvinylidene fluoride (PVDF) has the advantages of good chemical stability, high temperature resistance, oxidation resistance, corrosion resistance, good toughness, high strength, etc. It is one of the preferred membrane materials for preparing ultrafiltration membranes. However, PVDF has extremely low surface energy and strong hydrophobicity, resulting in low water flux after film formation, serious adsorption pollution when separating oil-water or protein-containing solution systems, and rapid flux attenuation, which reduces the service life of the membrane. Moreover, the polluted membrane finally needs to remove pollutants through the dissolution of cleaning reagents. This cleaning process not only consumes chemical reagents,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00C07K1/34
Inventor 薛爱莲周守勇赵宜江蔡健健王蓉张艳李梅生张莉莉褚效中邢卫红
Owner HUAIYIN TEACHERS COLLEGE
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