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Novel polyvinylidene fluoride film as well as preparation method and application thereof

A technology of polyvinylidene fluoride and separation membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., and can solve the problems of poor stability, durability, hydrophilicity and flux decline, and reduced membrane hydrophilicity and other problems, to achieve the effect of improved hydrophilic properties, less increase in preparation costs, and excellent elongation

Inactive Publication Date: 2012-10-17
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of nano-TiO 2 PVDF hybrid membranes after particle modification still have some significant disadvantages
When Nano TiO 2 After the particles are dissolved in the casting solution, the high concentration of nano-TiO 2 Particles are easy to agglomerate, resulting in defects in the membrane pore structure and a decrease in hydrophilicity and flux, and nano-TiO 2 Particles are easily lost from hybrid membranes
Mechanical property tests showed that nano-TiO 2 Particle-modified PVDF hybrid membranes have reduced elongation despite higher tear strength
In addition, TiO 2 Loss of nanoparticles from hybrid membranes reduces the membrane's hydrophilicity, thermal stability, and mechanical strength and fouling resistance, TiO 2 The PVDF hybrid film modified by nanoparticles has poor stability and durability

Method used

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  • Novel polyvinylidene fluoride film as well as preparation method and application thereof
  • Novel polyvinylidene fluoride film as well as preparation method and application thereof
  • Novel polyvinylidene fluoride film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Adding TiO 2 Nanowires (0%, mass ratio relative to PVDF)

[0029] Add 5g of polyvinylidene fluoride and 0.03g of sodium hexametaphosphate into 21.5g of N,N dimethylacetamide (DMAC) organic solvent, stir vigorously and ultrasonically disperse, then add 1.4g of polyvinylpyrrolidone, and heat in a water bath Stir vigorously for 24 hours to form a casting solution with uniform properties, then vacuum degassing at -50KPa for more than 30 minutes, and then use the L-S phase inversion method to form a film at a temperature of 25°C and a humidity of 50%, and volatilize in the air After 30 seconds, soak in 15% ethanol coagulation bath for 24 hours, then rinse with deionized water to prepare TiO 2 Nanoparticle-modified polyvinylidene fluoride separation membrane.

Embodiment 2

[0030] Example 2: Adding TiO 2 Nanowires (1%, mass ratio relative to PVDF)

[0031] 1% TiO 2 Add 19g of N, N dimethylacetamide (DMAC) organic solvent to the nanowires, stir vigorously and ultrasonically disperse, add 5g of polyvinylidene fluoride and 0.25g of sodium hexametaphosphate, and then add 0.75g of polyvinylpyrrolidone , heated in a water bath and vigorously stirred for 24 hours to form a uniform casting solution, and then degassed in vacuum at -50KPa for more than 30 minutes, and then used the L-S phase inversion method to form a film at a temperature of 25°C and a humidity of 50%. After being volatilized in the air for 30 seconds, soak in a 15% ethanol coagulation bath for 24 hours, and then rinse with deionized water to prepare TiO 2 Nanowire modified polyvinylidene fluoride separation membrane.

Embodiment 3

[0032] Embodiment 3: adding TiO 2 Nanowires (2%, relative to the mass ratio of PVDF)

[0033] 2% TiO 2 Add 14g of nanowires to N, N dimethylacetamide (DMAC) organic solvent, stir vigorously and ultrasonically disperse, add 5g of polyvinylidene fluoride and 0.2g of sodium hexametaphosphate, and then add 1.0g of polyvinylpyrrolidone , heated in a water bath and vigorously stirred for 24 hours to form a uniform casting solution, and then degassed in vacuum at -50KPa for more than 30 minutes, and then used the L-S phase inversion method to form a film at a temperature of 25°C and a humidity of 50%. After being volatilized in the air for 30 seconds, soak in a 15% ethanol coagulation bath for 24 hours, and then rinse with deionized water to prepare TiO 2Nanowire modified polyvinylidene fluoride separation membrane.

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Abstract

The invention relates to a titanium oxide nanowire modified polyvinylidene fluoride separation film and a preparation method of the film. The titanium oxide nanowire modified polyvinylidene fluoride separation film comprises polyvinylidene fluoride (PVDF) accounting for 18-25wt% of the total mass, organic solvent accounting for 70-80wt% of the total mass, porogen accounting for 3-5wt% of the total mass, dispersing agent accounting for 0.1-1wt% of the total mass and titanium oxide nanowire accounting for 1-5wt% of PVDF. The modified film solves the problem that the PVDF-TiO2 nanoparticles are easily agglomerated and can easily run away, and has stability and durability.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride (PVDF) separation membrane, a preparation method thereof, and an application in water treatment. technical background [0002] Polyvinylidene fluoride (PVDF) is widely used as a raw material for ultrafiltration membranes in industrial production due to its good oxidation resistance, thermal stability, resistance to hydrolysis, good mechanical strength and film-forming properties. However, compared with other membrane materials, the most prominent feature of PVDF is its strong hydrophobicity, which is the main factor restricting the large-scale application of PVDF membranes in many fields, especially the application of protein drugs, food and beverage and water purification, etc. In the separation of the aqueous phase separation system, it is easy to produce adsorption pollution, which reduces the two main separation indicators of membrane flux and rejection rate, reduces the service life of the membran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00C02F1/44
Inventor 魏永
Owner CHANGZHOU UNIV
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