Graphene/teflon film for wastewater treatment and preparation method thereof

A technology of polytetrafluoroethylene membrane and polytetrafluoroethylene, which is applied in the direction of permeation/dialysis water/sewage treatment, chemical instruments and methods, membrane technology, etc., can solve the problem of low filtration efficiency, narrow pore range, and impractical retention of impurities To achieve the effect of enhancing the adsorption effect, improving the adsorption and filtration efficiency, improving the filtered water flow and purification effect

Inactive Publication Date: 2018-11-23
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] It can be seen that the conventional PTFE filter membrane used in the treatment of oily sewage in the prior art has a relatively single pore size, which is difficult to adapt to changes in water quality, and cannot ideally intercept impurities in various particle sizes in the water. The water quality control index of reinjection water in permeable oil layer, its narrow pore range, low filtration efficiency and other defects limit the application of PTFE filter membrane in the treatment of containing sewage

Method used

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  • Graphene/teflon film for wastewater treatment and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a. Evenly mix 75 parts by weight of polytetrafluoroethylene powder, 10 parts by weight of graphene, and 5 parts by weight of silica aerogel, heat and melt in the extruder to form a melt extrusion, and each section of the extruder is heated The temperature is 300°C in the first stage, 330°C in the second stage, 340°C in the third stage, and 310°C in the fourth stage. A composite base film was formed by three-roll calendering; the rolling speed of the film-forming rolls was 30 m / min, and the temperature difference between the rolls was 10°C. The pore size of silica airgel is 15-20nm.

[0033] b. First, the base film is stretched longitudinally, and the stretching ratio of the longitudinal stretching is 25 times, and then the transverse stretching is carried out; the transverse stretching ratio is 20 times; Liquid nitrogen is used for quenching, and the flow rate of liquid nitrogen is controlled so that the quenching surface temperature of the upper surface is 180°C, and ...

Embodiment 2

[0036] a. Evenly mix 80 parts by weight of polytetrafluoroethylene powder, 5 parts by weight of graphene, and 5 parts by weight of silica airgel, heat and melt in the extruder to form a melt extrusion, and each section of the extruder is heated The temperature is 310°C in the first stage, 320°C in the second stage, 340°C in the third stage, and 310°C in the fourth stage. A composite base film was formed by three-roll calendering; the rolling speed of the film-forming rolls was 30 m / min, and the temperature difference between the rolls was 10°C. The pore size of silica airgel is 15-20nm.

[0037] b. First, the base film is stretched longitudinally, and the stretching ratio of the longitudinal stretching is 25 times, and then the transverse stretching is carried out; the multiple of the transverse stretching is 25 times; Liquid nitrogen is used for quenching, and the flow rate of liquid nitrogen is controlled so that the quenching surface temperature of the upper surface is 180...

Embodiment 3

[0040] a. Evenly mix 85 parts by weight of polytetrafluoroethylene powder, 15 parts by weight of graphene, and 5 parts by weight of silica airgel, heat and melt in the extruder to form a melt extrusion, and each section of the extruder is heated The temperature is 310°C in the first stage, 320°C in the second stage, 330°C in the third stage, and 310°C in the fourth stage. A composite base film was formed by three-roll calendering; the rolling speed of the film-forming rolls was 60 m / min, and the temperature difference between the rolls was 10°C. The pore size of silica airgel is 15-20nm.

[0041] b. First, the base film is stretched longitudinally, and the stretching ratio of the longitudinal stretching is 30 times, and then it is stretched laterally; the multiple of the lateral stretching is 20 times; Liquid nitrogen is used for quenching, and the flow rate of liquid nitrogen is controlled so that the quenching surface temperature of the upper surface is 180°C, and the quenc...

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Abstract

The invention discloses a graphene / teflon film for wastewater treatment and a preparation method thereof. The preparation method specifically comprises the steps that a, teflon powder, graphene and aerosil are mixed and subjected to melt extrusion and rolled to be a composite base film; b, the composite base film is subjected to longitudinal and transverse stretching sequentially; c, chilling is conducted in the transverse stretching process, and a gradient microporous structure is formed; and d, heat shaping is conducted after chilling is completed, cooling and rolling are conducted, and thegraphene / teflon film for wastewater treatment is obtained. The method has the following beneficial effects that the gradient microporous structure is formed due to chilling in the transverse stretching process of the base film, the pore diameter distribution range is wide, the filter water flux and the purification effect are improved, the adsorption effect is remarkably enhanced through synergiceffect of the gradient microporous structure and graphene, and thus the adsorption and filtration efficiency on the contained wastewater is improved.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to the preparation of treatment membranes, in particular to a graphene / polytetrafluoroethylene membrane used for sewage treatment and a preparation method. Background technique [0002] With the acceleration of industrialization, environmental pollution is becoming more and more serious, and environmental protection has become a global concern. Oily sewage is an important environmental pollutant, which causes serious pollution and damage to the hydrosphere, biosphere, and atmosphere, endangers human health and living environment, seriously affects ecological balance, and affects the normal operation of enterprise production. Oil resources are non-renewable resources. Once recovered, most of them can be used comprehensively. It is necessary and urgent to treat oily sewage and recycle resources. [0003] Sewage treatment methods have been widely used in high-efficiency adsorption, ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D67/00C02F1/44
CPCB01D71/36B01D67/0079C02F1/44
Inventor 陈庆昝航
Owner CHENDU NEW KELI CHEM SCI CO LTD
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