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A kind of preparation method of superhydrophilic polymer film with demulsification function

A polymer membrane and super-hydrophilic technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as complicated process and difficult emulsion separation of emulsion, and achieve excellent separation performance and good reusability Effect

Active Publication Date: 2021-03-09
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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  • A kind of preparation method of superhydrophilic polymer film with demulsification function
  • A kind of preparation method of superhydrophilic polymer film with demulsification function
  • A kind of preparation method of superhydrophilic polymer film with demulsification function

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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 20 wt%. Heat and stir at 70°C for 8 hours, dissolve into a transparent homogeneous solution, and then stand at constant temperature at 70°C for defoaming. Using the immersion precipitation phase inversion method, scrape the casting solution evenly on the glass plate at room temperature (20°C) to form a liquid film with a thickness of 300 μm, and quickly immerse it in the coagulation bath to form a film, and then the formed polysegregation The vinyl fluoride / styrene maleic anhydride blend film was taken out from the coagulation bath and soaked in deionized water (room temperature 20°C).

[0031] (2) Prepare a hyperbranched polyoxypropylene polyoxyethylene polyether aqueous solution, add a catalyst, ultrasonically vibra...

Embodiment 2

[0033] Prepare superhydrophilic polyvinylidene fluoride oil-water separation membrane with the method described in Example 1, wherein the grafting reaction time is respectively 0h, 3h, 6h, 9h, and is respectively denoted as M-0, M-3, M-6 and M-9. The surface contact angle of the superhydrophilic polyvinylidene fluoride oil-water separation membrane made by optical contact angle measuring instrument is measured, and the results are shown in image 3 . From image 3 It can be clearly seen that the pure water contact angle of the ungrafted polyvinylidene fluoride / styrene maleic anhydride blend film surface 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 decreased gradually. The angle decreased to 18.5° at 9 hours of grafting, realizing the superhydrophilic property.

Embodiment 3

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

[0037]

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

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Abstract

The invention provides a method for preparing a super-hydrophilic polymer membrane with demulsification function. Specifically, polyvinylidene fluoride (PVDF), polypropylene (PP) or polytetrachloroethylene (PTFE) was used as the base film material to blend with styrene-maleic anhydride copolymer (SMA) to prepare the casting solution. The PVDF / SMA ultrafiltration membrane is prepared by immersion precipitation phase inversion method, and the hyperbranched polyether demulsifier is grafted onto the surface of the polymer membrane by using the chemical reaction between the anhydride on the membrane surface and the terminal hydroxyl group of the hyperbranched polyether demulsifier to make the modified Membrane demulsification effect, hydrophilicity, water flux and rejection rate are improved, so as to realize efficient oil-water separation, reduce membrane fouling and prolong its service life.

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 superhydrophilic polymer membrane with demulsification function. Background technique [0002] Oil-water mixture is a common environmental pollutant, which has a wide range of sources, from petroleum industry, manufacturing industry, transportation industry and other fields to food and catering, medicine and household life. With the continuous development of social economy, the discharge of oily wastewater is increasing, and the sources are becoming more and more extensive, causing serious environmental pollution and serious waste of water resources. Considering environmental management, recovery of various oils, and water reuse, it is imperative to separate oil and water from oil-water mixtures. [0003] The interfacial film formed by oil and water hinders the polymerization between water droplets, resulting in difficu...

Claims

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Application Information

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Patent Type & Authority Patents(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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