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Preparation method of plasma-grafted polyvinylidene fluoride resin nanofiltration membrane

A technology of polyvinylidene fluoride resin and plasma, applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of short service life and failure to meet the use requirements, and achieve good water quality, easy management and maintenance, The effect of taking up less space

Active Publication Date: 2017-05-10
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 polyvinylidene fluoride resin nanofiltration membrane. The preparation method of the plasma grafted polyvinylidene fluoride resin nanofiltration membrane may comprise the following steps:

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

[0024] The treated inorganic particles are blended with polyvinylidene fluoride resin powder and additives in a mixer, and then extruded to the spinneret by a twin-screw extruder at high temperature, and spun into a hollow fiber membrane;

[0025] The hollow fiber membrane is extracted and washed with alkali to form a micro-nano-scale hollow fiber membrane substrate;

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

[0027] Wash and dry the hollow fiber membrane base material, soak it in the above coating solution for a certain period of time, take it out and dry it, put the hollow fiber membrane base...

Embodiment 1

[0048] (1) Raw materials

[0049] Polyvinylidene fluoride (PVDF) resin 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 resin 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 2With 3kg polyvinylidene fluoride (PVDF) resin powder, 1kg epoxidized soybean oil blending 4 hours in the high-speed mixer, drop into twin-screw extruder hopper then. The mixture was melt-extruded to a spinneret at 160° C. by a twin-screw extruder to obtain a heat-treated PVDF hollow fiber membrane. Take 10 pieces with a total area of ​​0.1m 2 The PVDF hollow fiber membrane is treated by the thermal 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 t...

Embodiment 2

[0053] The same method and steps as in Example 1 were used to heat process the PVDF hollow fiber nanofiltration membrane. The difference is that the nanoparticles used in Example 2 are nano-alumina. The pure water flux of the prepared hollow fiber nanofiltration membrane is 146L / m 2 .h, the film contact angle was 26°, respectively.

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Abstract

A preparation method of plasma-grafted polyvinylidene fluoride resin nanofiltration membrane comprises the steps of oiling nano inorganic particles; blending the treated inorganic particles with polyvinylidene fluoride resin powder and an additive in a mixing unit, extruding the mixture to a spinneret plate through a twin-screw extruder at high temperature, and spinning to obtain hollow fiber membrane; extracting the hollow fiber membrane, washing with an alkali to form micro-nano hollow fiber membrane base material; pouring glycosylallylamide and acrylic acid into absolute ethyl alcohol, stirring well to form coating liquid; washing the hollow fiber membrane base material, drying, soaking in the coating liquid for certain time, taking out and air-drying, exposing the hollow fiber membrane base material to plasma to obtain the resin nanofiltration membrane covered with surface high-hydrophilic micro coating. The nano-filtration membrane has the advantages of high strength, high throughput, good acid and alkali tolerance, permanent hydrophilicity and the like.

Description

technical field [0001] The invention relates to a preparation method of a plasma-grafted polyvinylidene fluoride resin nanofiltration membrane, which is particularly suitable for resin nanofiltration membranes 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 s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D69/02B01D67/00B01D61/02C02F1/44
CPCB01D61/027B01D67/0006B01D69/02B01D69/087B01D71/34B01D2323/38B01D2325/24B01D2325/30B01D2325/36C02F1/442
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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