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Preparation method of plasma grafted feve fluororesin nanofiltration membrane

A plasma and fluororesin technology, applied in the field of fluororesin nanofiltration membranes, can solve the problems of short service life and can not meet the requirements of use, and achieve the effects of good water quality, easy management and maintenance, and small footprint

Active Publication Date: 2017-07-28
BEIJING QINGYUAN POWERISE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current polymer nanofiltration membrane prepared by wet method is limited by its own material, or by the coated base membrane, and it will be oxidized and chemically decomposed under the conditions of high temperature, high acid-base, and high-salt wastewater. and other reactions, the service life is short, and it cannot meet the requirements of harsh fields such as high acid-base, high-salt wastewater, and high-temperature wastewater.

Method used

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preparation example Construction

[0022] The invention provides a preparation method of plasma grafted FEVE fluororesin nanofiltration membrane. The preparation method of this plasma grafted FEVE fluororesin nanofiltration membrane may comprise the following steps:

[0023] Oil treatment of nano-scale inorganic particles;

[0024] The treated inorganic particles are blended with tetrafluoroethylene-vinyl ether copolymerized FEVE fluororesin powder and additives in a mixer, and then pressed into a flat film with a hot press at 100°C-190°C;

[0025] The fluoroplastic flat film is extracted and washed with alkali to form a micro-nano-scale fluororesin film substrate;

[0026] Pour glucose allylamide and acrylic acid into absolute ethanol, stir evenly to form a coating solution;

[0027] Clean and dry the fluororesin film base material, soak it in the above coating solution for a certain period of time, take it out and dry it, put the fluororesin film base material in the plasma and irradiate it to obtain a high...

Embodiment 1

[0048] (1) Raw materials

[0049] Tetrafluoroethylene-vinyl ether copolymer (FEVE) fluororesin powder, nano silicon dioxide (SiO 2 ), nano-alumina (Al 2 o 3 ), Soybean Oil, Epoxidized Soybean Oil, DOP, Light Gasoline, Absolute Ethanol, Sodium Hydroxide, Glucose Allylamide, Acrylic Acid

[0050](2) Preparation of plasma-grafted fluororesin nanofiltration membrane

[0051] 1kg nano-SiO 2 Put into the high-speed blender and mix with the DOP of 0.2kg. Nano-SiO after blending 2 Blend with 3kg tetrafluoroethylene-vinyl ether copolymer (FEVE) fluororesin powder and 1kg epoxy soybean oil in a high-speed mixer for 4 hours, and then use a hot press at 100°C to press into FEVE flat film in sequence. Take an area of ​​0.1m 2 FEVE fluorine plastic flat film, soaked in 1 liter of light gasoline for 4 hours. Take out the flat film and wash it with pure water. Then put the flat membrane into 20% NaOH solution and soak for 4 hours. Take out the flat film, wash it with pure water, and...

Embodiment 2

[0053] 1kg nano-SiO 2 Put into the high-speed blender and mix with the DOP of 0.2kg. Nano-SiO after blending 2 Blend with 3kg tetrafluoroethylene-vinyl ether copolymer (FEVE) fluororesin powder and 1kg epoxy soybean oil in a high-speed mixer for 4 hours, then drop into the twin-screw extruder hopper. The mixture was melt-extruded to a spinneret at 160°C using a twin-screw extruder to obtain a heat-treated hollow fiber membrane. Take 10 pieces with a total area of ​​0.1m 2 The hollow fiber membrane is treated by heat method, soaked in 1 liter of light gasoline for 4 hours. Take out the hollow fiber membrane and wash it with pure water. Then put the hollow fiber membrane into 20% NaOH solution and soak for 4 hours. The hollow fiber membrane is taken out, cleaned with pure water, and dried to form a micro-nano-scale hollow fiber membrane substrate. Pour 10 g of glucose allylamide and 5 g of acrylic acid into 1 liter of absolute ethanol, and stir evenly at high speed to form...

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Abstract

A preparation method of a plasma grafted FEVE fluororesin nanofiltration membrane comprises the following steps: nanometer inorganic particles are subjected to oil processing; the processed inorganic particles are blended with tetrafluoroethylene-vinyl ether copolymerization type FEVE fluororesin powder and additives in a blender, and the obtained mixture is pressed into a flat membrane by a hot press at 100-190 DEG C; the flat fluoroplastic membrane is subjected to extraction and caustic washing, and micro-nano-meter fluororesin membrane base material is formed; glycosylallylamide and acrylic acid are poured into absolute ethyl alcohol and stirred uniformly, and a coating solution is formed; the fluororesin membrane base material is washed, dried, soaked in the coating solution for a period of time, taken out, aired and irradiated in plasma, and the fluororesin nanofiltration membrane coated with a micro-coating with highly hydrophilic surface is prepared. The nanofiltration membrane has the characteristics of being high in strength, great in flux, resistant to acid and base, permanently hydrophilic and the like.

Description

technical field [0001] The invention relates to a preparation method of a plasma-grafted FEVE fluororesin nanofiltration membrane, which is particularly suitable for the fluororesin nanofiltration membrane in harsh fields such as tap water purification, fine chemical industry, high acid-base, high-temperature waste water and the like. Background technique [0002] With the aggravation of water pollution, people are more and more concerned about the quality of drinking water. Traditional drinking water treatment mainly removes suspended solids and bacteria in water through flocculation, sedimentation, sand filtration and chlorination disinfection, but the removal effect on various dissolved chemical substances is very low. With the increasingly serious shortage of water resources, the aggravation of environmental pollution and the improvement of drinking water standards in various countries, "advanced drinking water treatment technology" that can remove various organic substa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/06B01D71/32C02F1/44
CPCB01D67/0079B01D69/06B01D71/32C02F1/442
Inventor 寇瑞强赵清梅波曹建勇朱守伟
Owner BEIJING QINGYUAN POWERISE TECH CO LTD
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