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A kind of polyimide microporous film and its preparation method and application in oil-water separation

A microporous film, polyimide technology, applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve the problems of insufficient emulsion separation purity, complex preparation process, poor designability, etc., and achieve excellent oil-water separation. Ability to solve the effect of high preparation cost and high applicability

Active Publication Date: 2021-06-11
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing membrane separation materials have obvious disadvantages: (1) the separation rate is low due to the limitation of the membrane area, and the separation purity of the emulsion is not high enough; (2) the pore structure is single, the designability is poor, and the separation or transmission of oil and water in the membrane The design of the characteristics is not high, and the separation efficiency is low; (3) the mechanical properties and temperature resistance of the existing gravity separation membrane are poor. For the separation of high-viscosity oil and water in the marine environment, auxiliary thermal energy technology (self-heating or auxiliary heating) cannot be used. High-efficiency and high-purity separation by means of power or power (injection by a high-power circulating pump)
Although the membrane materials prepared by the above technical solutions all have the ability to separate oil and water, the complex preparation process of the above materials, the difficulty of large-scale preparation, and the inability to separate oil-water emulsions or heavy oil emulsions limit their wide application.

Method used

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  • A kind of polyimide microporous film and its preparation method and application in oil-water separation
  • A kind of polyimide microporous film and its preparation method and application in oil-water separation
  • A kind of polyimide microporous film and its preparation method and application in oil-water separation

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preparation example Construction

[0056] The present invention provides a kind of preparation method of polyimide microporous film in the first aspect, described preparation method comprises the steps:

[0057] (1) polyamic acid solution is provided;

[0058] (2) adding a hydrophobic modifier to the polyamic acid solution;

[0059] (3) forming the mixed solution obtained in step (2) into a membrane material, and coagulating the obtained membrane material by a coagulation bath to obtain a polyamic acid microporous film;

[0060] (4) adopt low surface tension solvent to carry out solvent replacement to polyamic acid microporous film; With

[0061] (5) imidizing the polyamic acid microporous film treated in step (4) to obtain a polyimide microporous film.

[0062] Step (1): Step (1) is a step of providing a polyamic acid solution. The polyamic acid solution is a solution in which the solvent is polyamic acid. In the technical solution provided by the present invention, the polyamic acid solution can be prepar...

Embodiment 1

[0092] Step 1: dissolving diaminodiphenyl ether and pyromellitic dianhydride in methylpyrrolidone, and reacting to obtain a 10wt% polyamic acid solution;

[0093] Step 2: Add a fluorosilane surface modifier (trimethoxy (1H, 1H, 2H, 2H-perfluorodecyl) silane) to the polyamic acid solution obtained from the reaction. The fluorosilane surface modifier is added to the polyamide The concentration in the acid solution is 2.5wt%, stirring to obtain a mixed solution;

[0094] Step 3: Scrape-coat the mixed solution on the substrate, then place it in ethanol at a temperature of 20°C, let it stand for 10 minutes, peel it off after solidification, and obtain a polyamic acid microporous film;

[0095] Step 4: Place the obtained polyamic acid microporous film into n-hexane for solvent replacement, the number of replacements is 4 times, and then dry it under normal pressure at 50°C to obtain the dried polyamic acid microporous film;

[0096] Step 5: imidizing the polyamic acid microporous f...

Embodiment 2

[0100] Step 1: dissolving diaminodiphenyl ether and pyromellitic dianhydride in methylpyrrolidone, and reacting to obtain a 25wt% polyamic acid solution;

[0101] Step 2: Add a fluorosilane surface modifier (trimethoxy (1H, 1H, 2H, 2H-perfluorodecyl) silane) to the polyamic acid solution obtained from the reaction. The fluorosilane surface modifier is added to the polyamide The concentration in the acid solution is 2.5wt%, stirring to obtain a mixed solution;

[0102] Step 3: Scrape-coat the mixed solution on the substrate, then place it in ethanol at a temperature of 20°C, let it stand for 10 minutes, peel it off after solidification, and obtain a polyamic acid microporous film;

[0103] Step 4: Place the obtained polyamic acid microporous film into n-hexane for solvent replacement, the number of replacements is 4 times, and then dry it under normal pressure at 50°C to obtain the dried polyamic acid microporous film;

[0104] Step 5: imidizing the polyamic acid microporous f...

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Abstract

The invention relates to a polyimide microporous film, its preparation method and its application in oil-water separation. The preparation method comprises the following steps: (1) providing a polyamic acid solution; (2) adding a hydrophobic modifier to the polyamic acid solution; (3) forming the mixed solution obtained in step (2) into a membrane material, The obtained membrane material is coagulated by a coagulation bath to obtain a polyamic acid microporous film; (4) a low surface tension solvent is used to replace the polyamic acid microporous film with a solvent; (5) the polyamic acid microporous film is processed by step (4) The polyamic acid microporous film is imidized to obtain the polyimide microporous film. The polyimide microporous membrane of the present invention has good mechanical flexibility and structural designability, exhibits high separation efficiency for different types of oil-water mixtures, and has low cost, high flux, high precision and high applicability Advantages, and its preparation process is simple, easy to implement, rich sources of raw materials, low cost.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a polyimide microporous film, a preparation method thereof, and an application in oil-water separation. Background technique [0002] With the rapid development of modern industry, the effective control of marine crude oil spills has attracted more and more attention, and has become a health and environmental issue that the world pays attention to. Due to the high viscosity of crude oil, the fluidity of the oil-water mixture in the ocean is relatively poor at room temperature during oil spills. How to efficiently remove the oil-water mixture formed by marine crude oil spills is a worldwide problem. Conventional methods such as incineration, linoleum, skimmers and dispersants either show lower absorption efficiencies or have severe operational limitations. [0003] Among all oil-water separation methods, superwetting oil-water separation membranes are considered to b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J7/12C08L79/08C08K5/5419B01D17/022
CPCB01D17/085C08J5/18C08J7/12C08J2379/08C08K5/5419
Inventor 张如炳侯先波周鹏
Owner BEIJING JIAOTONG UNIV
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