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Method for preparing lasting super-hydrophobic modified polypropylene hollow fiber membrane

A technology of superhydrophobic modification and polypropylene membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. It can solve the problem of loss of carbon dioxide removal function of membrane pores, and achieve low cost, high water pressure resistance, The effect of simple process

Inactive Publication Date: 2012-09-26
SUZHOU XINER ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention mainly overcomes that when the polypropylene membrane is used in the process of the ethanolamine solution rich in carbon dioxide in the membrane contactor, since the surface of the membrane material will inevitably be gradually wetted, the membrane pores will be blocked by the ethanolamine solution and gradually lose carbon dioxide removal. Function is a technical defect, and a method for superhydrophobic modification of polypropylene hollow fiber membranes is provided.

Method used

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Examples

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preparation example Construction

[0021] A preparation method with durable superhydrophobic modified polypropylene hollow fiber membrane, comprising the following steps:

[0022] (1) Dissolving fluoroesters containing unsaturated double bonds, acrylates containing long alkyl chains, dithiols and photoinitiators in ethanol solutions to prepare modified solutions;

[0023] (2) The polypropylene film material is placed between the two discharge electrodes of the dielectric barrier discharge, and the inert gas is passed through to carry out the normal pressure dielectric barrier discharge plasma treatment;

[0024] (3) Soak the polypropylene membrane material treated in step (2) in the modification solution described in step (1), and irradiate it with ultraviolet light for 1 to 40 minutes at the same time, and finally wash it with deionized water and place it in the After drying at room temperature, the superhydrophobic modified polypropylene membrane material of surface graft polymerization and surface crosslinki...

Embodiment 1

[0033] (N-Methylperfluorohexylsulfonamido) ethyl ester (C 6 f 13 SO 2 N(CH 3 )CH 2 CH 2 OCOCH=CH 2 ) and lauryl acrylate, dithiol and photoinitiator were mixed and dissolved in ethanol solution at the concentration ratio of 0.1%, 0.1%, 0.05 and 0.001%, to prepare a hydrophobic modifier solution. The polypropylene membrane (the membrane pore diameter is 0.1~0.9mm, the contact angle of the membrane surface is 108.4±1.3 o ) placed in the dielectric barrier discharge plasma equipment at normal pressure, adjust the distance between the two discharge electrodes to 2 cm, pass helium gas into the discharge, and the gas flow rate is 1 liter / min; the discharge frequency is 10 kHz, and the discharge power is 80 watts , the treatment time was 10 seconds; the plasma-treated polypropylene film was immersed in the hydrophobic modifier solution prepared above, and ultraviolet light was irradiated for 40 minutes at the same time. Take it out, wash it with deionized water, and then dry i...

Embodiment 2

[0035] (N-Methyl perfluorooctyl sulfonamido) ethyl ester (C 8 f17 SO 2 N(CH 3 )CH 2 CH 2 OCOCH=CH 2 ) and myristyl acrylate, dithiol and photoinitiator are mixed and dissolved in ethanol solution at a concentration ratio of 1%, 1%, 0.1% and 0.005%, to prepare a hydrophobic modifier solution. The polypropylene membrane (the membrane pore diameter is 0.1~0.9mm, the contact angle of the membrane surface is 108.4±1.3 o ) placed in a dielectric barrier discharge plasma device at atmospheric pressure, adjust the distance between the two discharge electrodes to 1.5 cm, pass helium gas during discharge, and the gas flow rate is 0.5 liters / minute; the discharge frequency is 10 kHz, and the discharge power is 50 watts , the treatment time was 5 seconds; the plasma-treated polypropylene film was immersed in the hydrophobic modification solution prepared above, and ultraviolet light was irradiated for 40 minutes at the same time. Take it out, wash it with deionized water, and then ...

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Abstract

The invention relates to a method for implementing super-hydrophobic modification on a polypropylene hollow fiber membrane material, in particular to a method for preparing a lasting super-hydrophobic modified polypropylene hollow fiber membrane. The method comprises the following steps of: respectively dissolving fluorine ester containing unsaturated double bonds, acrylate containing a long alkyl chain, dithiol and a photo-initiator into an acetone solution to prepare a modification solution, soaking a polypropylene membrane treated by normal pressure plasmas into the modification solution, performing ultraviolet irradiation, washing, airing, and thus obtaining a fluorine-containing and long alkyl chain grafted modified polypropylene membrane material. A uniform, lasting and stable super-hydrophobic layer containing fluothane and the long alkyl chain is formed on the surface of the polypropylene membrane material, so that the hydrophobic polymer membrane is endowed with excellent super-hydrophobic property, high water pressure resistance and high air permeability; and the method is simple, good in treatment effect and low in cost, does not produce environment pollution, and is efficient and energy-saving.

Description

technical field [0001] The invention relates to a method for superhydrophobic modification of a polypropylene hollow fiber membrane material, in particular to a preparation method for a modified polypropylene hollow fiber membrane with durable superhydrophobic properties. Background technique [0002] Excessive global carbon dioxide emissions are one of the main reasons for the aggravation of the greenhouse effect. At present, my country's total carbon dioxide emissions have surpassed that of the United States, ranking first in the world; among them, the carbon dioxide emitted by thermal power plants accounts for more than 40% of my country's total carbon dioxide emissions. The use of ethanolamine solution capture and absorption liquid recycling technology is one of the most effective methods to achieve carbon dioxide capture. The main process of this technology is: use ethanolamine solution as the absorption liquid to absorb and separate carbon dioxide in the flue gas, and...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D69/08B01D67/00
Inventor 唐叶红黄小军
Owner SUZHOU XINER ENVIRONMENTAL TECH CO LTD
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