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PVDF polymer separation membrane and preparation method thereof

A polymer and separation membrane technology, which is applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of PVDF membrane material yellowing, decline in alkali corrosion resistance, aging, etc., and achieve excellent alkali resistance, Long service life and strong effect

Active Publication Date: 2021-02-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the film is formed, due to factors such as changes in the crystal structure and crystallinity of the PVDF membrane material, the alkali corrosion resistance of the PVDF membrane material is reduced, resulting in the PDVF polymer separation membrane material being used in the treatment of alkaline wastewater or chemical cleaning with alkaline solution. , leading to yellowing, degradation and aging of PVDF membrane materials

Method used

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  • PVDF polymer separation membrane and preparation method thereof
  • PVDF polymer separation membrane and preparation method thereof
  • PVDF polymer separation membrane and preparation method thereof

Examples

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preparation example Construction

[0047] The preparation method of PDVF polymer separation membrane comprises the following steps:

[0048] (1)PVDF / nano-SiO2 2 Preparation of blend membranes

[0049] Dissolve 15 g of PVDF6010 in 60 g of DMAc, and then mix 2 g of SiO 2 Uniformly dispersed in DMAc. The porogen 2 g of PVPK30 was then added to the solution and kept stirring for 12 hours. After stirring, the solution was kept at 60° C. for 24 hours to defoam the casting solution. Then pour the casting solution on a clean glass plate, and use a scraper to coat the film (adjust the height of the scraper to 250 μm, and adjust the speed to 1.2m min -1 ). The glass plate was then immersed in a coagulation bath containing 15% DMAc aqueous solution (volume fraction) at 60°C. After the coagulation process was complete, the membrane was transferred to a 4% sodium hypochlorite solution and kept overnight.

[0050] (2) Infiltration pre-modification of the membrane surface

[0051] Dissolve 5 g of gelatin, 10 g of sodi...

Embodiment 1

[0105] Weigh 15 grams of PVDF6010 powder, 2 grams of PVPK30 powder, 2 grams of hydrophilic nano-silicon dioxide, and 60 grams of DMAC, stir at 60 degrees Celsius for 24 hours to form a homogeneous casting solution, and let stand for 24 hours for defoaming. Inducing phase separation to form a film; Weigh 5 grams of gelatin, 10 grams of sodium lauryl sulfate and 10 milliliters of glycerin to prepare a 10% aqueous solution of sodium lauryl sulfate 1 ; Weigh 0.1 gram of 1-hydroxycyclohexyl phenyl ketone (184), and 1.5 grams of polyester acrylic resin are dissolved in 17.15 grams of tripropylene glycol diacrylate (TPGDA) to prepare 8% polyester acrylate resin solution 2 ; soak the above membrane in the above solution ① and vibrate ultrasonically for three minutes, take out and remove excess alkyl anion compound droplets on the surface of the membrane, and then dry it naturally. Then put it in the resin solution for 24 hours, wait until the resin solution completely infiltrates the ...

Embodiment example 2

[0107] Weigh 15 grams of PVDF6010 powder, 2 grams of PVPK30 powder, 2 grams of hydrophilic nano-silicon dioxide, and 60 grams of DMAC, stir at 60 degrees Celsius for 24 hours to form a homogeneous casting solution, and let stand for 24 hours for defoaming. Inducing phase separation to form a film; Weigh 5 grams of gelatin, 10 grams of sodium lauryl sulfate and 10 milliliters of glycerin to prepare a 10% aqueous solution of sodium lauryl sulfate 1 ; Weigh 0.1 gram of 1-hydroxycyclohexyl phenyl ketone (184), 1.5 grams of polyester acrylic resin dissolved in 17.15 grams of diacrylate-1,6-hexanediol (HDDA) to prepare 8% polyester acrylic resin in solution 2 ; soak the above membrane in the above solution ① and vibrate ultrasonically for three minutes, take out and remove the excess alkyl anion compound droplets on the surface of the membrane, and then dry it naturally. Then place it in the resin solution for 24 hours, wait until the resin solution completely infiltrates the PVDF ...

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Abstract

The invention discloses a PVDF polymer separation membrane and a preparation method thereof, and according to the method, a layer of alkyl anion compound capable of resisting alkali liquid attack is formed on the surface of a PVDF membrane material, so that the purpose of improving the alkali corrosion resistance of the PVDF membrane material is achieved. The method comprises the following steps:mixing PVDF powder, hydrophilic nano silicon dioxide and a pore-foaming agent (such as PVP, PEG and the like) solution by adopting a solution blending method, performing non-solvent induced phase separation (NIPS) to form a membrane, lightly wiping redundant moisture on the surface of the membrane, then putting the membrane into a 5-10% anionic surfactant aqueous phase solution, and performing ultrasonic soaking for 3-5 minutes until the membrane is completely soaked; taking out and removing redundant liquid drops on the surface of the membrane, hanging and airing; putting the air-dried PVDF membrane into a 5-14% alkali-resistant resin solution, taking out the PVDF membrane after the PVDF membrane is completely soaked, lightly wiping off redundant resin on the surface of the membrane, andthen putting the membrane under an ultraviolet lamp for ultraviolet radiation curing for 30-90s, so as to obtain the alkali-resistant membrane.

Description

technical field [0001] The invention relates to a method for modifying the alkali-resistant PDVF polymer separation membrane material, and more specifically relates to a method for improving the alkali corrosion resistance of the PDVF polymer separation membrane material. Background technique [0002] PVDF is a semi-crystalline and partially fluorinated polymer. It not only has the excellent thermal stability, oxidation resistance and radiation resistance of fluoropolymers, but also has certain chemical stability, excellent mechanical properties, medium Electrical properties, good processability and good solubility in polar solvents make PVDF an important material for the preparation of porous membranes. In the preparation process of PVDF membrane materials, such as non-solvent-induced phase separation (NIPS) or thermal phase separation, it is necessary to add N,N-dimethylformamide (DMF), N,N-dimethylacetamide Polar solvents such as (DMAc) and N-methylpyrrolidone (NMP) are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
CPCB01D71/34B01D69/02B01D67/0009B01D67/0002B01D2325/30
Inventor 崔朝亮汪朝晖温公朴汪效祖周玥潘俊邢卫红
Owner NANJING UNIV OF TECH
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