Preparation method of super-hydrophilic polymer membrane with demulsification function

A polymer membrane, super-hydrophilic technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of difficult to achieve demulsification separation and complex process of emulsion, and achieve good reuse performance and excellent separation performance. Effect

Active Publication Date: 2019-02-12
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent of CN105603637A discloses a high-efficiency electrospinning oil-water separation fiber membrane. First, a polyphthalic acid casting solution is prepared, and a cellulose-polyphthalic acid membrane is prepared by a coaxial electrospinning method, and then processed. Thermal imidization, synthesis of benzothiazine monomers and immobilization in situ together with a nanofiber membrane to finally obtain a nanofiber membrane with biodegradability and higher oil-water separation performance, which is adopted in the present invention The process needs to be prepared at a specific temperature and humidity, and the process is more complicated
However, regardless of the hydrophobic membrane or the hydrophilic membrane, it is difficult to achieve efficient demulsification and separation for stable emulsions.

Method used

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  • Preparation method of super-hydrophilic polymer membrane with demulsification function
  • Preparation method of super-hydrophilic polymer membrane with demulsification function
  • Preparation method of super-hydrophilic polymer membrane with demulsification function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) After the solid polyvinylidene fluoride powder and styrene maleic anhydride powder are vacuum-dried at 40°C to remove moisture, they are dissolved in DMAc, and lithium chloride is added as a porogen to prepare a casting solution with a concentration of 20wt%, The reaction was heated and stirred at 70 °C for 8 h, and after dissolving into a transparent homogeneous solution, the solution was allowed to stand at a constant temperature of 70 °C for defoaming. Using the immersion precipitation phase inversion method, the casting liquid was scraped evenly on the glass plate at room temperature (20°C) to form a liquid film with a thickness of 300 μm, and the film was rapidly immersed in the coagulation bath and phase-inverted to form a film. The vinyl fluoride / styrene maleic anhydride blend membrane was taken out from the coagulation bath and immersed in deionized water (at room temperature of 20°C).

[0031] (2) Prepare an aqueous solution of hyperbranched polyoxypropylen...

Embodiment 2

[0033] The superhydrophilic polyvinylidene fluoride oil-water separation membrane was prepared by the method described in Example 1, wherein the grafting reaction times were respectively 0h, 3h, 6h, and 9h, respectively denoted as M-0, M-3, M-6 and M-9. The surface contact angle of the prepared superhydrophilic polyvinylidene fluoride oil-water separation membrane was measured by an optical contact angle measuring instrument. The results are shown in image 3 . from image 3 It can be clearly seen that the contact angle of pure water on the surface of the ungrafted polyvinylidene fluoride / styrene maleic anhydride blend membrane is only 67.5°, which does not reach the superhydrophilic state. With the increase of grafting time, the more hyperbranched polyether grafted on the membrane surface, the contact angle gradually decreased. It was reduced to 18.5° when grafted for 9 h, achieving superhydrophilic performance.

Embodiment 3

[0035] Taking the superhydrophilic polyvinylidene fluoride oil-water separation membrane M-9 prepared in Example 2 as the experimental object, at room temperature, the separation performance of different oil-water emulsions was measured by using a filter device. The dichloromethane system is obtained by stirring 0.5g sodium dodecyl sulfate, 114mL dichloromethane and 1mL water at room temperature for 3h; the kerosene system is obtained by stirring 0.5g sodium dodecyl sulfate, 10mL kerosene and 1L water at room temperature for 3h. The separation results are shown in Table 1.

[0036] The oil-water separation performance of the super-hydrophilic polyvinylidene fluoride oil-water separation membrane M-9 prepared in Table 1 Example 2

[0037]

[0038] *Separation efficiency=(TOC of stock solution before membrane separation-TOC in permeate of membrane separation) / TOC of stock solution before membrane separation.

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Abstract

The invention provides a preparation method of a super-hydrophilic polymer membrane with a demulsification function. Specifically, polyvinylidene fluoride (PVDF) or polypropylene (PP) or poly-tetrafluoroethylene (PTFE) is used as a base membrane material and blended with a styrene-maleic anhydride copolymer (SMA) to prepare a membrane casting solution, a PVDF / SMA hyperfiltration membrane is prepared by adopting an immersion precipitation phase inversion method, a hyperbranched polyether demulsifier is conjugated to the surface of the polymer membrane by utilizing a chemical reaction between anhydride on the surface of the membrane and a terminal hydroxyl group of the hyperbranched polyether demulsifier, and thus the demulsification effect, hydrophily, water flux and the retention rate of the modified membrane are all improved, efficient oil-water separation is achieved, membrane pollution is lowered, and the service life of the membrane is prolonged.

Description

technical field [0001] The invention belongs to the technical field of functional polymer membrane separation, and particularly relates to a preparation method of a superhydrophilic polymer membrane with a demulsification function. Background technique [0002] Oil-water mixture is a common environmental pollutant with a wide range of sources, from the petroleum industry, manufacturing industry, transportation and other fields to food, catering, medicine and household life. With the continuous development of society and economy, the discharge of oily wastewater is increasing and the sources are more and more extensive, causing serious environmental pollution and serious waste of water resources. Considering the aspects of environmental management, recovery of various oils, and water reuse, it is imperative to separate oil-water mixtures from oil-water mixtures. [0003] Demulsification is difficult because the interfacial film formed by oil and water hinders the polymerizat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/52B01D71/34B01D67/00
CPCB01D67/0006B01D71/34B01D71/52B01D2325/36
Inventor 严峰徐灿王明霞徐梦锦汪广源刘常贺
Owner TIANJIN POLYTECHNIC UNIV
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