Preparation method of permanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber nanofiltration membrane

A technology of polytetrafluoroethylene and polytetrafluoroethylene, which is applied in the field of preparation of permanent hydrophilic nano-graphene polytetrafluoroethylene hollow fiber nanofiltration membrane, can solve the problems of complex preparation process and complex structure of nanofiltration membrane. Achieve the effect of simple preparation process, improve adsorption and filtration efficiency, and improve binding strength

Inactive 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 CN102698614A introduces a method for preparing a tubular nanofiltration membrane with a four-layer structure. Stable chemical bonds are formed between the layers and have excellent compression resistance and mechanical strength. However, the structure of the nanofiltration membrane is too complicated and difficult to prepare. The process is too complicated

Method used

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  • Preparation method of permanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber nanofiltration membrane
  • Preparation method of permanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber nanofiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of nano-graphene dispersant: such as figure 1 As shown, take 15g nano-graphene powder (commercially available product, purity: >99.5wt%, thickness: 4-20nm, number of layers: <30, diameter: 5-10μm), and disperse it into 10mL N-methylpyrrolidone , after ultrasonic vibration for 2 hours to obtain a graphene dispersion, add 80wt% N-methylpyrrolidone aqueous solution, dilute to 30mL, add 0.026mg N-methyl anthranilate methyl ester, keep warm at 50°C for 3 hours, cool at room temperature for later use ;

[0035] (2) Mixing: such as figure 2 As shown, F106 polytetrafluoroethylene dispersion resin powder (Dakin Corporation, Japan, molecular weight 2-10 million), liquid paraffin, nano-silica (commercially available product, average particle size 10-30nm), nano-graphene dispersion agent, KH550 coupling agent according to the mass ratio of 38:6:4:3.5:0.05 mixed evenly, at 20 ℃ for 30 hours to make F106 polytetrafluoroethylene dispersed resin powder, liquid paraff...

Embodiment 2

[0046] (1) Preparation of nano-graphene dispersant; take 10g of nano-graphene powder (commercially available product, purity: >99.5wt%, thickness: 4-20nm, number of layers: <30, diameter: 5-10μm), and Disperse it in 10mL N-methylpyrrolidone, and obtain a graphene dispersion after ultrasonic vibration for 2h, add 80wt% N-methylpyrrolidone aqueous solution, dilute to 30mL, add 0.026mg N-methyl anthranilate methyl ester , 50°C for 3 hours, then cooled at room temperature for later use.

[0047] (2) Mixing: F106 polytetrafluoroethylene dispersion resin powder (Dakin Corporation, Japan, molecular weight 2-10 million), petroleum ether and nano-silica (commercially available products, average particle size 10-30nm), nano Graphene dispersant and titanate silane coupling agent CT-114 are mixed evenly at a mass ratio of 50:8:5:4:0.08, and left to stand at 40°C for 20 hours to make polytetrafluoroethylene dispersion resin powder, petroleum ether , nano-silica, nano-graphene dispersant, ...

Embodiment 3

[0058] (1) Preparation of nano-graphene dispersant; take 8g of nano-graphene powder (commercially available product, purity: >99.5wt%, thickness: 4-20nm, number of layers: <30, diameter: 5-10μm), and Disperse in 10mL of N-methylpyrrolidone, ultrasonically shake for 2h to prepare a graphene dispersion, add 80wt% aqueous solution of N-methylpyrrolidone, dilute to 30mL, add 0.026mg of methyl N-methylanthranilate, 50°C After 3 hours of heat preservation, cool at room temperature for later use;

[0059] (2) Mixing: F106 polytetrafluoroethylene dispersed resin powder (Dakin Corporation of Japan, molecular weight 2 to 10 million), kerosene and nano silicon dioxide (commercially available products, average particle size 10-30nm), nano graphite Mix ethylene dispersant and KH792 silane coupling agent according to the mass ratio of 20:15:10:2:5, and let it stand for 25 hours at 30°C to make polytetrafluoroethylene dispersion resin powder, kerosene, nano-silica, nano Graphene dispersant ...

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Abstract

The invention discloses a preparation method of a permanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber nanofiltration membrane. The method comprises the following steps: mixing andpressing polytetrafluoroethylene dispersion resin, a nano graphene material, an extrusion aid, nano silicon dioxide and a coupling agent to obtain a green body; extruding the green body through a pushing and pressing machine to form a polytetrafluoroethylene hollow pipe, carrying out stretching and sintering heat setting in a drying oven, and carrying out surface hydrophilic stabilizer treatmentto obtain a permanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber base membrane;; and carrying out water-phase impregnation, oil-phase impregnation and aftertreatment to prepare thepermanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber nanofiltration membrane. The manufacturing method of the permanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber nanofiltration membrane is based on the existing preparation process and equipment of the polytetrafluoroethylene hollow fiber membrane, additional slitting and wrapping equipment does not need tobe added, and the method is simple and easy to implement, low in cost and high in practical value.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for preparing a permanent hydrophilic nano-graphene polytetrafluoroethylene hollow fiber nanofiltration membrane. Background technique [0002] The current nanofiltration membranes basically use polymers such as polysulfone, polypropylene, and polyvinylidene fluoride as the base membrane, supplemented by non-woven fabrics as the support layer, and an additional modified layer. For example, Chinese patent CN105396472A discloses a preparation method of a composite base membrane nanofiltration membrane, the base membrane of which is a polysulfone-sulfonated polysulfone composite base membrane. 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 hydrophilic composite layer is the k...

Claims

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Application Information

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