External-pressure type charged hollow fiber nano-filtration membrane and preparation method therefor

A nanofiltration membrane and external pressure technology, applied in the field of multi-layered tubular nanofiltration membrane and its preparation, can solve the problem of easy separation and the like, and achieve the effects of improving connection fastness, ensuring fastness and not falling off easily.

Active Publication Date: 2013-02-13
HAINAN LITREE PURIFYING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the hollow fiber nanofiltration membrane is prepared by composite method, which makes the separation between layers easy to occur, and the nanofiltration separation functional layer has strong hydrophobicity.

Method used

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  • External-pressure type charged hollow fiber nano-filtration membrane and preparation method therefor
  • External-pressure type charged hollow fiber nano-filtration membrane and preparation method therefor
  • External-pressure type charged hollow fiber nano-filtration membrane and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] 1. Form the ultrafiltration layer 2 outside the support tube 1

[0097]1.1 Surface treatment of inorganic nanoparticles: add 5 grams of silica nanoparticles with a particle size of 20 nm to 100 ml of 50% methanol solution by mass percentage, and add 1 gram of 3-aminopropyl- Triethoxysilane, stirred at 50°C for 1 hour, then filtered, washed with absolute ethanol and then vacuum-dried at 50°C for 48 hours to obtain surface-treated silica nanoparticles;

[0098] 1.2 Preparation of carboxyl-containing polyacrylate derivative copolymer:

[0099] Mix 30g of acrylic acid and 100g of methyl acrylate, add 0.87g of initiator azobisbutyronitrile (AIBN), and react at 70°C for 6 hours to obtain a carboxyl-containing polyacrylate derivative copolymer with the following structural formula:

[0100]

[0101] 1.3 Preparation of film-forming solution: Dissolve 10 g of polyethersulfone, 2 g of the above-prepared carboxyl-containing polyacrylate derivative copolymer, 1 g of the above-p...

Embodiment 2

[0111] 1. Form the ultrafiltration layer 2 outside the support tube 1

[0112] 1.1 Surface treatment of inorganic nanoparticles: 30 grams of titanium dioxide nanoparticles with a particle size of 40nm were added to 100 ml of absolute ethanol solution, and 10 grams of γ-(2,3-glycidyloxy) was added after ultrasonic dispersion for 30 minutes Propyltrimethoxysilane was stirred at 80°C for 4 hours, then filtered, washed with absolute ethanol and then vacuum-dried at 80°C for 12 hours to obtain surface-treated titanium dioxide nanoparticles;

[0113] 1.2 Preparation of carboxyl-containing polyacrylate derivative copolymer:

[0114] Mix 50g of methacrylic acid and 100g of ethyl methacrylate, add 0.47g of initiator azobisbutyronitrile (AIBN), and react at 65°C for 10 hours to obtain a carboxyl-containing polyacrylate derivative copolymer with the following structural formula :

[0115]

[0116] 1.3 Preparation of film-forming solution: 30 g of polysulfone, 10 g of the above-prepa...

Embodiment 3

[0126] 1. Form the ultrafiltration layer 2 outside the support tube 1

[0127] 1.1 Surface treatment of inorganic nanoparticles: add 15 grams of silica nanoparticles with a particle size of 30 nm to 100 ml of 50% ethanol solution by mass percentage, and add 5 grams of 3-aminopropyl-tri Ethoxysilane, stirred at 60°C for 3 hours, then filtered, washed with absolute ethanol and then vacuum-dried at 60°C for 36 hours to obtain surface-treated silica nanoparticles;

[0128] 1.2 Preparation of carboxyl-containing polyacrylate derivative copolymer:

[0129] Mix 80g of methacrylic acid and 100g of methyl methacrylate, add 0.77g of initiator azobisbutyronitrile (AIBN), and react at 60°C for 8 hours to obtain a carboxyl-containing polyacrylate derivative copolymer with the following structural formula :

[0130]

[0131] 1.3 Preparation of film-making solution: dissolve 15g of polyvinyl chloride, 6g of the above-prepared carboxyl-containing polyacrylate derivative copolymer, 3g of ...

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Abstract

The invention provides an external-pressure type charged hollow fiber nano-filtration membrane which consists of a support tube, an ultra-filtration layer, a nano-filtration separation layer and a charged modified function layer from inside to outside in sequence, wherein the support tube is connected with the ultra-filtration layer by an inorganic nano-particle net structure, the ultra-filtration layer is connected with the nano-filtration separation layer by an amido bond, and the nano-filtration separation layer is connected with the charged modified function layer by a carbon-carbon single bond. The external-pressure type charged hollow fiber nano-filtration membrane is good in performance and excellent in hydrophilcity, water permeability and antifouling property, the flux is more than 35L / m2h, the rate of removal for univalent salt is more than 40%, and the rate of removal for divalent salt is more than 97%. The invention also provides a preparation method for the nano-filtration membrane, and the method is simple in process, can realize continuous or batch production according to the actual requirements and is suitable for industrial application.

Description

Technical field [0001] The invention is a film technology field, which specializes in a multi -layered structural tubular filter membrane and its preparation method. Background technique [0002] Na filter is a new type of membrane separation technology developed in the late 1980s. The relative molecular weight is between 200 and 2000, and the membrane pore diameter is about 1nm.Its separation process is performed at room temperature, which will not cause phase change and chemical reactions, so it will not destroy the biological activity of the separation object. At the same time, due to the scales and charge rejection effects of the aperture, it can effectively cut off high -priced metal ions and relative molecular weights than higher than the amount of relative molecular weight than200 organic small elements.Compared with reverse osmosis, the operating pressure required for nan filtration has greater application potential in the fields of high -quality drinking water production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/10B01D69/08B01D67/00
Inventor 朱宝库刘卫东肖玲王纳川赵斌王俊陈良刚
Owner HAINAN LITREE PURIFYING TECH CO LTD
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