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Preparation method of hydrophilic graphene polytetrafluoroethylene composite nanofiltration membrane

A technology of polytetrafluoroethylene and composite nanofiltration membrane, which is applied in the field of membrane separation, can solve problems such as complicated procedures, and achieve the effects of simple preparation process, improved bonding strength, and improved performance

Pending Publication Date: 2020-08-18
颇尔(河北)环保设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN02580585A discloses a method for preparing a pollution-resistant low-pressure nanofiltration membrane, which specifically discloses grafting and modifying zwitterionic copolymers on polyacrylonitrile-based membranes, and then compounding polyamide functional layers. The method involves zwitterionic copolymerization preparation, the process is more complex

Method used

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  • Preparation method of hydrophilic graphene polytetrafluoroethylene composite nanofiltration membrane
  • Preparation method of hydrophilic graphene polytetrafluoroethylene composite nanofiltration membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Preparation of nano-graphene dispersant: as figure 1 As shown, take 15g nano-graphene powder (purity: >99.5wt%, thickness: 4-20nm, number of layers: <30, diameter: 5-10μm), disperse it into 10mL N-methylpyrrolidone, and ultrasonically vibrate After 2 hours, prepare a graphene dispersion, add an aqueous solution of 80 wt% N-methylpyrrolidone, dilute to 30 mL, add 0.026 mg of methyl N-methyl anthranilate, keep warm at 50 ° C for 3 hours, and cool at room temperature for later use;

[0033] (2) Nano-graphene dispersant activation: such as figure 2 As shown, the 1wt% nano-graphene dispersant aqueous solution and the 0.5wt% sodium dodecylbenzenesulfonate aqueous solution were mixed in a volume ratio of 1:10, and the hydrophobic polytetrafluoroethylene was micro-dispersed after ultrasonic dispersion for 0.5h. The porous membrane was immersed for 5min to 12h; after taking it out and drying it at 60°C for 2h, an active nanographene-based membrane was obtained;

[0034] (...

Embodiment 2

[0041] (1) Preparation of nano-graphene dispersant: take 10g nano-graphene powder (purity: >99.5wt%, thickness: 4-20nm, number of layers: <30, diameter: 5-10μm), and disperse it into 10mLN- In methylpyrrolidone, after ultrasonic vibration for 2 hours, a graphene dispersion was prepared, adding 80 wt% aqueous solution of N-methylpyrrolidone, diluting to 30 mL, adding 0.026 mg of N-methyl anthranilate, and incubating at 50 ° C for 3 hours. Cool at room temperature for later use;

[0042] (2) Nano-graphene dispersant activation: 1.5wt% nano-graphene dispersant aqueous solution and 2.5wt% sodium dodecylbenzenesulfonate solution are mixed at a volume ratio of 1:10, and after ultrasonic dispersion for 0.5h, the The hydrophobic polytetrafluoroethylene microporous membrane is immersed for 5 minutes to 12 hours; after taking it out and drying it at 60°C for 2 hours, an active nano-graphene-based membrane is obtained;

[0043] (3) Water phase impregnation: the active nano-graphene-base...

Embodiment 3

[0050] (1) Preparation of nano-graphene dispersant: take 8g nano-graphene powder (purity: >99.5wt%, thickness: 4-20nm, number of layers: <30, diameter: 5-10μm), and disperse it into 10mLN- In methylpyrrolidone, after ultrasonic vibration for 2 hours, a graphene dispersion was prepared, adding 80 wt% aqueous solution of N-methylpyrrolidone, diluting to 30 mL, adding 0.026 mg of N-methyl anthranilate, and incubating at 50 ° C for 3 hours. Cool at room temperature for later use;

[0051] (2) Nano-graphene dispersant activation: 1.5wt% nano-graphene dispersant aqueous solution and 2.5wt% sodium dodecylbenzenesulfonate solution are mixed at a volume ratio of 1:10, and after ultrasonic dispersion for 0.5h, the The hydrophobic polytetrafluoroethylene microporous membrane is immersed for 5 minutes to 12 hours; after taking it out and drying it at 60°C for 2 hours, an active nano-graphene-based membrane is obtained;

[0052] (3) Water phase impregnation: the active nano-graphene base ...

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Abstract

The invention discloses a preparation method of a hydrophilic graphene polytetrafluoroethylene composite nanofiltration membrane. The method comprises the following steps: preparing a nano-graphene dispersing agent, immersing a hydrophobic polytetrafluoroethylene microporous membrane in a mixed solution of the nano-graphene dispersing agent and sodium dodecyl benzene sulfonate for a while, and moving out and drying the reaction product to obtain an active nano-graphene base membrane, and carrying out water-phase impregnation, oil-phase impregnation and post-treatment to obtain the polytetrafluoroethylene composite nanofiltration membrane. According to the preparation method of the hydrophilic graphene polytetrafluoroethylene composite nanofiltration membrane, the characteristics that a polytetrafluoroethylene microporous membrane has high strength and does not need an additional supporting layer are utilized; the membrane preparation process is relatively simple, and the bonding strength between the base membrane and the nanofiltration modified layer is greatly improved by utilizing the unique node-fibril microporous structure of the polytetrafluoroethylene microporous membrane, sothat the performance of the composite nanofiltration membrane is improved.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing a hydrophilic graphene polytetrafluoroethylene composite nanofiltration membrane. Background technique [0002] In the current nanofiltration composite membrane, polymers such as polysulfone, polypropylene, and polyvinylidene fluoride are basically used as the base membrane, supplemented by non-woven fabric as the support layer, and a modified layer is added. For example, Chinese patent CN103223300A discloses a preparation method of a hollow fiber composite nanofiltration membrane, which consists of a hollow fiber microporous base membrane, a polysulfone transition layer and a polyamide composite layer. However, since these polymer base membranes are basically hydrophobic, the composite layers of the composite nanofiltration membranes are all hydrophilic. How to strengthen the bonding strength between the hydrophobic base membrane and the hydrop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D71/02B01D69/12B01D69/08B01D69/06B01D69/02B01D67/00B01D61/02
CPCB01D61/027B01D67/0079B01D69/02B01D69/06B01D69/08B01D69/12B01D71/021B01D71/36B01D2325/36
Inventor 高同柱
Owner 颇尔(河北)环保设备有限公司