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Preparation method of high-flux PVDF (polyvinylidene fluoride) porous membrane

A porous membrane and high-flux technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of restricting the application of membrane separation, low flux of polyvinylidene fluoride membrane, etc., to improve water flow amount, the effect of improving hydrophilicity

Active Publication Date: 2015-10-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low flux of polyvinylidene fluoride membrane, its application in membrane separation is seriously restricted.

Method used

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  • Preparation method of high-flux PVDF (polyvinylidene fluoride) porous membrane
  • Preparation method of high-flux PVDF (polyvinylidene fluoride) porous membrane
  • Preparation method of high-flux PVDF (polyvinylidene fluoride) porous membrane

Examples

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Embodiment 1

[0023] Example 1: Put 8g polyvinyl alcohol, 8g polyvinylidene fluoride, 3g polyvinylpyrrolidone, 1g sodium nitrate, 1g deionized water, 38g dimethylacetamide, 40g dimethylformamide and 1g graphene powder in a cone Mix well in the flask, aging at 70°C for 48h, stirring at 70°C for 36h, and standing at room temperature for 48h to defoam to obtain a casting solution. Pour the casting liquid on the glass plate and scrape it to form a film. After the wet film was pre-evaporated in the air for 5 seconds, it was quickly placed in the coagulation bath for 1 min to initially replace the solvent. The coagulation bath was a deionized aqueous solution containing 20% ​​dimethylacetamide. The membrane after preliminary replacement was soaked in deionized water for 7 days to form a preliminary membrane. The pre-formed film was heated and activated in deionized water at 40°C for 6 hours, then soaked in absolute ethanol for 12 hours, and then taken out, soaked in n-butanol for 12 hours, and dr...

Embodiment 2

[0024] Example 2: Mix 0.5g polymethyl methacrylate, 10g polyvinylidene fluoride, 1g lithium chloride, 0.5g deionized water, 88g dimethyl sulfoxide and 0.01g graphene powder in an Erlenmeyer flask. , Curing at 70 ℃ for 18h, stirring at 70 ℃ for 24h, and standing at room temperature for 24h to defoam to obtain a casting liquid. Pour the casting liquid on the glass plate and scrape it to form a film. After the wet film was pre-evaporated in the air for 10 minutes, it was quickly placed in a coagulation bath for 30 minutes to initially replace the solvent. The coagulation bath was a deionized aqueous solution containing 30% dimethyl sulfoxide and 20% dimethyl acetamide. The membrane after preliminary replacement is soaked in deionized water for 10 days to form a preliminary membrane. The pre-formed film was heated and activated in deionized water at 90°C for 0.5h, then soaked in absolute ethanol for 24h, and then taken out and soaked in n-butanol for 24h, and dried in the air. Th...

Embodiment 3

[0025] Example 3: Put 5g polyethersulfone, 10g polyvinylidene fluoride, 1.5g polyethylene glycol, 1g polyethersulfone, 0.01g deionized water, 82g dimethylformamide and 0.5g graphene powder in an Erlenmeyer flask Mix well, mature at 70°C for 8h, stir at 70°C for 24h, and stand at room temperature for 24h to defoam to obtain a casting solution. Pour the casting liquid on the glass plate and scrape it to form a film. After the wet film was pre-evaporated in the air for 30 seconds, it was quickly placed in a coagulation bath for 7 minutes to initially replace the solvent. The coagulation bath was a deionized aqueous solution containing 30% dimethylformamide. The membrane after preliminary replacement was soaked in deionized water for 7 days to form a preliminary membrane. The pre-formed film was heated and activated in deionized water at 30°C for 8 hours, and then soaked in absolute ethanol for 24 hours, then taken out and soaked in n-butanol for 12 hours, and dried in the air. T...

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Abstract

The invention discloses a preparation method of a high-flux PVDF porous membrane. The method comprises the following steps: mixing PVDF, a highly hydrophilic polymer, a pore-forming additive, deionized water, a solvent and graphene powder, curing, stirring, standing, defoaming so as to obtain membrane casting liquid, and forming a wet membrane from the membrane casting liquid in a scraping manner; pre-evaporating the wet membrane in air, putting the pre-evaporated membrane in a solidification bath, and soaking to obtain a primary membrane in the deionized water; putting the primary membrane in the deionized water, performing heating activation, soaking in absolute ethyl alcohol and n-butyl alcohol, and airing in the air. According to the method, graphene nano-particles with two-dimensional structures are used as additives, the pure water flux can be up to 800L*m<-2>*h<-1> or more, and the rejection rate on bovine serum albumin is 98% or more; the hydrophilic polymer is added for performing the activation on the primary membrane, so that the hydrophilia of the PVDF membrane is greatly improved, and the membrane surface contact angle is up to 59.8 degrees; a porous membrane material is adopted, so that the structure is controllable, and the pore diameter range is controlled to be within 0.1-5 microns.

Description

Technical field [0001] The invention relates to a preparation method of a water treatment polymer film, which belongs to the field of environmental protection. In particular, it relates to a preparation method for blending and modifying a water treatment membrane. Background technique [0002] Membrane technology is one of the modern high-tech developed in recent years, and it is also a new growth point for the development of chemical engineering and environmental engineering. As a new type of separation method, compared with traditional separation technology, membrane technology has the advantages of high separation efficiency, high selectivity, low energy consumption, no phase change, simple operation, less floor space, and no pollution. The occasion field can be integrated with other technologies to achieve effective processing methods. Through rapid development in the past ten years, membrane technology has been widely and effectively used in the chemical industry, three wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 刘久清吴秀锋
Owner CENT SOUTH UNIV
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