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Acid, alkali and organic solvent resisting diaphragm material, and preparation method and application thereof

A technology resistant to organic solvents and diaphragm materials, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high cost of membrane materials, narrow range of acid and alkali resistance and solvent resistance, and meet separation requirements. The effect of maintaining hydrophilicity and preventing the decrease of hydrophilicity

Active Publication Date: 2016-03-30
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a diaphragm material resistant to acid and alkali and organic solvents and its preparation method and application for membrane extraction technology, mainly to solve the problem of high cost of alternative membrane materials in the prior art, acid and alkali resistance and solvent resistance. narrow technical issues

Method used

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  • Acid, alkali and organic solvent resisting diaphragm material, and preparation method and application thereof
  • Acid, alkali and organic solvent resisting diaphragm material, and preparation method and application thereof
  • Acid, alkali and organic solvent resisting diaphragm material, and preparation method and application thereof

Examples

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Embodiment 1

[0042] Prepare a homogeneous, clear casting solution as follows: 25 grams of methylisopropylene-propenyl alcohol copolymer (wherein the propenyl alcohol content is 45%) is dissolved in 75 grams of N-methylpyrrolidone, heated at 80 ° C, Stir for 12 hours until it reaches a uniform, colorless and clear state, the viscosity of the casting solution is 10000cp, and let it stand for defoaming. At an ambient temperature of 25°C and a relative humidity of 60%, the casting solution was scraped with a 200 μm scraper to form a nascent film, and then quickly immersed in a water bath at 20°C to solidify to form a film. After washing with water, 30% ethylene glycol is used for moisturizing treatment, and LiCl / water of 0.1mol / L is used as the raw material solution for Li + Ion diffusion test, the diffusion rate is 1.76*10 -8 mol cm -2 ·s -1 . The scanning electron micrograph of the prepared separator material is shown in figure 1 . figure 1 The crosssection in means: section; topsurfac...

Embodiment 2

[0044] A homogeneous, clear casting solution was prepared as follows: 22 grams of ethylene-acrylic acid copolymer (wherein the ethylene content was 50%) was dissolved in 78 grams of dimethyl sulfoxide, allowed to stand for 6 hours for defoaming, and the ambient temperature was 25 ℃, humidity 60%, scrape the obtained homogeneous film casting solution on the 54um non-woven support layer with a 100μm scraper to form a nascent film with support, and quickly immerse it in a 3.5℃ gel bath to solidify and form a film. After washing with water, 30% glycerin was used for moisturizing treatment, thereby preparing a flat diaphragm material. see figure 2 with image 3 , are the cross-sectional topography of the flat diaphragm material and the cross-sectional topography of the non-woven support section, respectively. As shown in the figure, the thickness of the prepared film was 70.2 μm, and 0.1mol / LLiCl / water was used as the raw material solution for Li + Ion diffusion test, the diffu...

Embodiment 3

[0046] Prepare a homogeneous and clear casting solution as follows: Dissolve 30 grams of ethylene-vinyl alcohol copolymer with an ethylene content of 38% at 100°C in 70 grams of N,N-dimethylacetamide, seal and let stand Degassing for 6 hours, at an ambient temperature of 18.1°C and a humidity of 55%, scrape the obtained homogeneous film casting solution on a glass plate with a 200 μm scraper to form a nascent film, and quickly immerse it in a gel bath at 1.5°C to solidify and form a film , 25% polyethylene glycol moisturizing treatment after washing with water, thus obtaining the final product. The thickness of the prepared film is 102.5 μm, 0.1mol / LLiCl / water is used as the raw material solution for Li+ ion diffusion test, and the diffusion rate is 1.97*10 -8 mol cm -2 ·s -1 , with 0.1035mol / LLiCl+1.0mol / LNaOH as the water phase, 0.4mol / LHA+0.2mol / LQCl in the organic phase (wherein, HA and QCl refer to 1-phenylazo-2-naphthol and methyl Trioctylammonium chloride) is the ext...

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Abstract

The invention discloses an acid, alkali and organic solvent resisting diaphragm material, and a preparation method and an application thereof. The diaphragm material is prepared from hydrophilic and hydrophobic block copolymers, and has a nano-pore structure. The nano-pore structure in the diaphragm material is prepared through an inorganic filler structure preparation method or an immersion phase separation method. The acid, alkali and organic solvent resisting diaphragm material has polar hydrophilic groups, and the surface of a diaphragm can be further grafted with other organic molecules with permselective functional groups by using above active groups, so realization of diaphragm functionalization is facilitated to meet various separation requirements. The diaphragm material can be applied in cation separating systems, such as separation of ions of lithium, copper, gold, platinum, palladium, silver, boron, rubidium, cesium, antimony, bismuth, nickel, mercury and other metals.

Description

technical field [0001] The invention belongs to the field of polymer membrane materials, and in particular relates to an acid-alkali-resistant and organic-solvent-resistant diaphragm material and a preparation method and application thereof. Background technique [0002] The membrane extraction process is a new type of extraction process with high efficiency and low energy consumption, which can be applied to ion selective extraction, separation of organic matter in waste liquid and other separation processes. In the membrane extraction process, the highly selective extractant is the carrier or core, and it is hoped to control its loss to the minimum, and at the same time, the ions and other substances to be separated can be freely transmitted. The extractant in the membrane extraction process is generally an organic solvent substance, so it is particularly important to use a material resistant to organic solvents as the diaphragm material. [0003] In addition, this type o...

Claims

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Application Information

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IPC IPC(8): B01D71/80B01D69/02B01D67/00
Inventor 何涛宋健锋李雪梅孔丁峰陈光华赵宝龙王周为殷勇姜标陈刚张冉张蒙晰田苗苗刘仁啸邢利新
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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