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Preparation method of amphiphilic block polymer nanofiltration membrane

A technology of amphiphilic block and block copolymer, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of high cost of raw materials, complicated preparation methods, and rarely used in water filtration membranes, etc. problem, to achieve the effect of low cost, strong operability and simple method

Active Publication Date: 2018-03-09
BEIJING ORIGIN WATER FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Composite reverse osmosis membranes currently basically occupy all commercial reverse osmosis membrane markets. The current composite reverse osmosis membranes are usually prepared by interfacial polymerization, and most of the existing amphiphilic block copolymers are used as protonated conductive membranes, which are very It is rarely used in water filtration membranes. A segmented block copolymer containing sulfonic acid groups is disclosed in the related art. This polymer has excellent performance as a proton conductive membrane and excellent swelling resistance to hot water. The block copolymer of the membrane is a block copolymer with a hydrophilic segment and a hydrophobic segment. The amphiphilic block copolymer is mainly made of polyacrylonitrile, polysulfone and polysulfonated styrene Atom transfer radical block copolymerization is carried out between them, not only the preparation method is complicated, but the cost of raw materials is high, and when the polymer is used as a proton-conducting membrane, it is usually used as a proton fuel cell instead of a water-filtering membrane.

Method used

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  • Preparation method of amphiphilic block polymer nanofiltration membrane
  • Preparation method of amphiphilic block polymer nanofiltration membrane

Examples

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preparation example Construction

[0021] Such as figure 1 As shown, the preparation method of the amphiphilic block polymer nanofiltration membrane according to the embodiment of the present invention comprises the following steps:

[0022] S1. Provide hydrophilic vinyl ether and its derivatives and styrene and its derivatives with hydrophobic segments, and carry out cationic block copolymerization of vinyl ether and its derivatives and styrene and its derivatives .

[0023] S2. Sulfonate the hydrophobic chain segment of styrene and its derivatives, and obtain a block copolymer having a hydrophilic chain segment and a sulfonic acid group chain segment through purification and drying.

[0024] S3, performing a phase inversion method on the block copolymer to form a membrane to obtain an amphiphilic block polymer nanofiltration membrane with sulfonic acid groups.

[0025] That is to say, the preparation method of the amphiphilic block polymer nanofiltration membrane according to the embodiment of the present i...

Embodiment 1

[0057] First, under the condition of -78°C, under the protection of dry nitrogen, 10L of dichloromethane solution was added to the reaction kettle, and then 10g of initiator tin tetrachloride was continuously added, and after aging at -78°C for 30min, 1L of ethyl Vinyl ether, after reacting for 40 minutes, slowly add 0.5 L of pre-cooled styrene monomer, and then slowly add 5 g of tin tetrachloride dropwise into it.

[0058] Then slowly raise the temperature to -15°C, continue the reaction for 2 hours, then add pre-cooled methanol to terminate the reaction, the product is precipitated in excess toluene, and then washed with 2% aqueous hydrochloric acid to precipitate the product, and finally dried in a vacuum oven to constant weight , and finally a block copolymer is obtained.

[0059] The dichloromethane solution (50wt%) of the polymer was heated and stirred in a constant temperature water bath at 40°C, and phosphorus pentoxide powder with 1% of the polymer mass was added ther...

Embodiment 2

[0061] The method adopted in this example is substantially the same as that in the above example, except that the hydrophilic vinyl ether and its derivatives used in this example are 1L isobutyl vinyl ether.

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Abstract

The invention discloses a preparation method of an amphiphilic block polymer nanofiltration membrane. The preparation method comprises the following steps: S1, vinyl ether and derivatives thereof having hydrophilcity and styrene and derivatives thereof having a hydrophobic segment are provided, and the vinyl ether and the derivatives thereof and the styrene and the derivatives thereof are subjected to cationic block copolymerization; S2, the hydrophobic segment of the styrene and the derivatives thereof is subjected to a sulfonation reaction, and after purification and drying, a block copolymer having a hydrophilic segment and a sulfonic acid group segment is obtained; and S3, the block copolymer forms a membrane by a phase transformation method, and the amphiphilic block polymer nanofiltration membrane with a sulfonic acid group is obtained. The preparation method of the amphiphilic block polymer nanofiltration membrane of the embodiment of the invention is high in operability and low in cost, and the prepared amphiphilic block polymer nanofiltration membrane has excellent performance.

Description

technical field [0001] The invention relates to the technical field of filter membrane preparation, and more specifically, relates to a method for preparing an amphiphilic block polymer nanofiltration membrane. Background technique [0002] Composite reverse osmosis membranes currently basically occupy all commercial reverse osmosis membrane markets. The current composite reverse osmosis membranes are usually prepared by interfacial polymerization, and most of the existing amphiphilic block copolymers are used as protonated conductive membranes, which are very It is rarely used in water filtration membranes. A segmented block copolymer containing sulfonic acid groups is disclosed in the related art. This polymer has excellent performance as a proton conductive membrane and excellent swelling resistance to hot water. The block copolymer of the membrane is a block copolymer with a hydrophilic segment and a hydrophobic segment. The amphiphilic block copolymer is mainly made of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/44B01D61/00B01D67/00
CPCB01D61/027B01D67/0006B01D71/44
Inventor 陈亦力夏建中彭文娟于云彭鹏李伟
Owner BEIJING ORIGIN WATER FILM TECH