Graphene modified polyvinylidene fluoride hollow fiber ultrafiltration membrane and preparation method thereof

A polyvinylidene fluoride, graphene modification technology, applied in ultrafiltration, separation methods, chemical instruments and methods, etc.

Active Publication Date: 2017-09-12
UNITED ENVIRONMENT TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing discussions on the preparation of hollow fiber ultrafiltration membranes by thermally induced phase separation, most researchers have focused their research on how to improve

Method used

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  • Graphene modified polyvinylidene fluoride hollow fiber ultrafiltration membrane and preparation method thereof
  • Graphene modified polyvinylidene fluoride hollow fiber ultrafiltration membrane and preparation method thereof
  • Graphene modified polyvinylidene fluoride hollow fiber ultrafiltration membrane and preparation method thereof

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preparation example Construction

[0025] A preparation method of a graphene-modified polyvinylidene fluoride hollow fiber ultrafiltration membrane, the specific steps are:

[0026] In order to effectively disperse graphene in polyvinylidene fluoride and to reduce costs, firstly, 0.01-1% graphene and 1-5% graphite powder are pre-mixed and microwave-dried, and then 0.02-0.5 % composite coupling agent, 0-1% iron powder, 20-45% polyvinylidene fluoride, mixed at high speed;

[0027] Add 1-25% of hydrophilic agent, 2-20% of pore-forming agent, and 30-70% of diluent in sequence to the above-mentioned high-speed mixed ingredients, and mix evenly to make a film-making material;

[0028] The hollow fiber ultrafiltration membrane is prepared by the thermal phase method, and the membrane material is poured into a twin-screw extruder at 200-400 ° C to heat it to a molten state; the melted membrane material passes through the hollow fiber membrane die After extrusion, it is cooled into a hollow fiber tube;

[0029] Pass c...

Embodiment 1

[0039] Pre-mix 0.2% graphene and 5% graphite powder and microwave dry, then add 0.5% composite coupling agent, 0% iron powder, 20% polyvinylidene fluoride, and mix at high speed;

[0040] Add 10% hydrophilic agent, 2% pore forming agent, and 30-62.3% diluent in sequence to the above-mentioned high-speed mixed ingredients, and mix evenly to make a film-making material;

[0041] Pour the film-making material into a twin-screw extruder at 200°C and heat it to a molten state; the melted film-making material is extruded through the hollow fiber membrane die and cooled to form a hollow fiber tube;

[0042] Pass compressed air or high-boiling-point non-solvent into the hollow fiber tube as the core liquid, and then send the hollow fiber tube into a gas-phase or liquid-phase separation tank to separate the diluent and pore-forming agent in the film-making material to obtain graphene Modified polyvinylidene fluoride hollow fiber ultrafiltration membrane.

[0043] The outer diameter of...

Embodiment 2

[0045] Pre-mix 1% graphene and 2% graphite powder and microwave dry, then add 0.15% composite coupling agent, 0.5% iron powder, 45% polyvinylidene fluoride, and mix at high speed;

[0046] Add 5% of hydrophilic agent, 16.35% of pore forming agent, and 30% of diluent in sequence to the above-mentioned high-speed mixed ingredients, and mix evenly to make a film-making material;

[0047] Pour the film-making material into a twin-screw extruder at 400°C and heat it to a molten state; the melted film-making material is extruded through the hollow fiber membrane die and cooled to form a hollow fiber tube;

[0048] Pass compressed air or high-boiling-point non-solvent into the hollow fiber tube as the core liquid, and then send the hollow fiber tube into a gas-phase or liquid-phase separation tank to separate the diluent and pore-forming agent in the film-making material to obtain graphene Modified polyvinylidene fluoride hollow fiber ultrafiltration membrane.

[0049] The outer dia...

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Abstract

The invention discloses a graphene modified polyvinylidene fluoride hollow fiber ultrafiltration membrane and a preparation method thereof. The ultrafiltration membrane is prepared from the following system in mass ratio: 20 to 45% of polyvinylidene fluoride, 0.01 to 1% of graphene, 1 to 5% of graphite powder, 0 to 1% of iron powder, 0.02 to 0.5% of compound coupling agent, 1 to 25% of hydrophilic agent, 30 to 70% of diluent and 2 to 20% of pore forming agent. The whole preparation method of the ultrafiltration membrane comprises the steps of premixing the graphene and the graphite powder and microwave drying; adding the compound coupling agent, the iron powder and the polyvinylidene fluoride and mixing in high speed; adding other raw materials to manufacture into a membrane making material; utilizing a thermotropic-phase method to prepare the ultrfiltration membrane. The graphene modified polyvinylidene fluoride hollow fiber ultrafiltration membrane disclosed by the invention which has catalytic, microelectrode, antibacterial and the like functions is prepared by utilizing special performance of the graphene or special performance generated by the graphene and the iron powder; when being applied to sewage treatment, the graphene modified polyvinylidene fluoride hollow fiber ultrafiltration membrane not only has a filtering effect, but also accelerates an oxidization and degradation effect on pollutants; thus, sewage treatment efficiency and anti-pollution capacity are greatly improved.

Description

technical field [0001] The invention relates to a hollow fiber ultrafiltration membrane and a preparation method, in particular to a graphene-modified polyvinylidene fluoride hollow fiber ultrafiltration membrane and a preparation method, and belongs to the field of membrane technology. Background technique [0002] Hollow fiber ultrafiltration membrane technology is a high-tech widely used in water purification, solution separation, concentration, extraction of useful substances from wastewater, and wastewater purification and reuse. At present, the preparation technologies of hollow fiber ultrafiltration membranes with better industrialization are mainly solution spinning method, melt spinning drawing method and thermally induced phase separation method. Among them, the solution spinning method needs to use a large amount of solvent (accounting for more than 80% of the film-forming system), and the solvent needs to be recovered, separated and recycled, which is easy to cau...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D69/08B01D67/00B01D61/14C02F1/44C02F1/469C02F1/72
Inventor 洪建春吴仕伟
Owner UNITED ENVIRONMENT TECH XIAMEN
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