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Preparation method of polyether-containing amphiphilic polymer/PVDF blend membrane

An amphiphilic polymer and blended membrane technology, which is applied in separation methods, chemical instruments and methods, grease/oily substances/floating matter removal devices, etc. problems such as low volume, to achieve the effect of excellent oil-water separation properties

Active Publication Date: 2021-08-24
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyvinylidene fluoride (PVDF), polypropylene (PP) or polytetrafluoroethylene (PTFE) is used as the base film material to blend with styrene-maleic anhydride copolymer (SMA) to prepare the casting film, and the non-solvent The PVDF / SMA ultrafiltration membrane is prepared by the conversion method, and the hyperbranched polyether demulsifier is grafted to the polymer membrane by using the chemical reaction between the anhydride of the membrane and the terminal hydroxyl group of the hyperbranched polyether demulsifier, which can realize efficient oil-water separation , but because the demulsifier and the base film are bonded by ester groups, it cannot be applied to the treatment of alkaline oil recovery wastewater
In addition, low permeation flux and poor antigenic oil contamination are the bottlenecks of current membrane separation technology in the industrial treatment of oily wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Dissolve 10g polyetheramine D230 in 10g N, N-dimethylformamide, dissolve 5g SMA (molecular weight 5000, anhydride content 10%) in 15g N, N-dimethylformamide; The solution was slowly added dropwise to the D230 solution, and stirred and reacted at 60°C for 10h;

[0014] (2) After the reaction is completed, pour the reaction solution into ethanol to precipitate the polymer, and wash the precipitated polymer with ethanol several times to remove unreacted raw materials, and obtain the D230 grafted SMA amphiphilic polymer, referred to as is D230-g-SMA;

[0015] (3) Dissolve 2g of D230-g-SMA amphiphilic polymer and 6g of PVDF in 42g of N,N-dimethylformamide at 70°C to form a casting solution, pour it on a glass plate after defoaming Scrape to form a liquid film, and then transfer it to water to prepare a D230-g-SMA / PVDF blend film by a non-solvent-induced phase inversion method;

[0016] (4) D230-g-SMA / PVDF blend membrane has a pure water contact angle of 50°, an underwa...

Embodiment 2

[0018] (1) Dissolve 10g polyetheramine CAED600 in 10g N,N-dimethylacetamide, dissolve 5g SMA (molecular weight 20000, anhydride content 10%) in 15g N,N-dimethylacetamide; The solution was slowly added dropwise to the CAED600 solution, and stirred and reacted at 60°C for 10h;

[0019] (2) After the reaction is completed, pour the reaction solution into ethanol to precipitate the polymer, and wash the precipitated polymer with ethanol several times to remove unreacted raw materials, and then obtain CAED600 grafted SMA amphiphilic polymer, referred to as It is CAED600-g-SMA;

[0020] (3) Dissolve 4g of CAED600 amphiphilic polymer and 7g of PVDF in 39g of N,N-dimethylacetamide at 70°C to form a casting solution. After defoaming, pour it on a glass plate and scrape it into a solution. The film was then transferred to ethanol to prepare the CAED600-g-SMA / PVDF blend film by the non-solvent-induced phase inversion method;

[0021] (4) CAED600-g-SMA / PVDF blend membrane has a pure wat...

Embodiment 3

[0023] (1) 10g polyether amine T403 is dissolved in 10g N, N-dimethylformamide, 5g SMA (molecular weight 50000, anhydride content 12%) is dissolved in 15g N, N-dimethylformamide; SMA The solution was slowly added dropwise to the T403 solution, and stirred and reacted at 60°C for 10h;

[0024] (2) After the reaction is completed, pour the reaction solution into ethanol to precipitate the polymer, and wash the precipitated polymer with ethanol several times to remove unreacted raw materials, and obtain the T403 grafted SMA amphiphilic polymer, referred to as is T403-g-SMA;

[0025] (3) Dissolve 3g of T403-g-SMA and 6g of PVDF in 41g of N,N-dimethylformamide at 70°C to form a casting solution. After defoaming, pour it on a glass plate and scrape it into a solution Membrane, and then transferred to water to prepare T403-g-SMA / PVDF blend membrane by non-solvent-induced phase inversion method;

[0026] (4) T403-g-SMA / PVDF blend membrane has a pure water contact angle of 48°, an un...

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Abstract

The invention provides a preparation method of a polyether-containing amphiphilic polymer / PVDF blend membrane. Specifically, firstly, amine-terminated polyether is grafted to polystyrene / maleic anhydride (SMA), and a polyether grafted SMA amphiphilic polymer is prepared; and the polyether grafted SMA amphiphilic polymer and polyvinylidene fluoride (PVDF) areblended to prepare a membrane casting solution, and the polyether-containing amphiphilic polymer / PVDF blended membrane is prepared by adopting a non-solvent induced phase inversion method. The surface and the pore wall of the membrane have polyether groups, so that the membrane shows good hydrophilicity and underwater super-oleophobic property, and polyether on the surface of the membrane has a demulsification function, so that the membrane can be used for demulsification and oil-water separation of oil extraction sewage.

Description

technical field [0001] The invention belongs to the technical field of separation of functional polymer membranes, in particular to a method for preparing a polyether-containing amphiphilic polymer / PVDF blend membrane. Background technique [0002] With the rapid development of petrochemical, pharmaceutical, metallurgy, and food processing industries, a large amount of oily sewage is produced, which poses a huge challenge to human life and the natural environment. Among them, the water content of oil production fluid in my country is getting higher and higher, and the water content of some oilfield production fluid exceeds 95%, which brings great challenges to the treatment of oil production wastewater and even affects the normal production of oil fields. [0003] Due to the high salinity of oil production wastewater, it usually contains active agents, polymers and other oil displacement agents, as well as a certain concentration of crude oil, forming an oil-in-water emulsio...

Claims

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Application Information

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IPC IPC(8): B01D71/52B01D67/00C02F1/40C02F1/44C02F103/10
CPCB01D71/52B01D67/0006C02F1/40C02F1/44B01D2325/36C02F2103/10
Inventor 张萌萌严峰王明霞庄圆王峥易宏张达
Owner TIANJIN POLYTECHNIC UNIV
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