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Preparation process of reinforced hybrid organic-inorganic film

An enhanced, hybrid membrane technology, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane defects, poor repeatability, and difficulty in mixing, to simplify the experimental process, widen Application prospect, simple and easy effect of film-making method

Inactive Publication Date: 2009-02-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that it is difficult to disperse the inorganic nanoparticles uniformly at the nanometer level, and it is usually necessary to carry out surface treatment on the particles.
[0015] Disadvantages of this method: adding catalyst (hydrochloric acid) to the casting solution is not conducive to the dissolution of organic polymers, and the final formed film is prone to defects and poor repeatability; the inorganic precursor is hydrolyzed and polymerized during the aging process of the casting solution , it is difficult to control the molecular weight of inorganic polymers, it is easy to form large-sized inorganic spherical particles, and it is difficult to achieve molecular-level mixing between the inorganic phase and the organic phase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of polyvinylidene fluoride (PVDF) hybrid membrane without additives

[0034] The casting solution is composed of PVDF, DMAC and TEOS, and the mass percentages are 15%, 79% and 6% respectively.

[0035] First, mix and stir PVDF, TEOS and DMAC for a period of time to obtain a clear casting solution, then mature it at 45°C for 2 days, cast after defoaming, and volatilize the casting solution in the air for 15 seconds before entering hydrochloric acid -Fixation into film in aqueous solution (pH=1). The membrane was soaked in the coagulation bath for about 5 minutes and then immersed in deionized water for 1 day.

[0036] At room temperature, the maximum strength and elastic modulus of the PVDF film without TEOS and the PVDF film containing TEOS were measured using a GT-TS-2000 tensile strength tester. It is measured that the maximum strength of the film containing TEOS is 7.92MPa, and the elastic modulus is 212.06Map, which is about 2 times larger th...

Embodiment 2

[0037] Example 2 Preparation of polyvinylidene fluoride (PVDF) hybrid membrane containing additives (PVP and LiCl)

[0038] The casting solution is composed of PVDF, PVP, LiCl, DMAC and TEOS, and the mass percentages are 15%, 4%, 3%, 64% and 14% respectively.

[0039] First, PVDF, PVP, anhydrous LiCl, TEOS and DMAC were mixed and stirred for a period of time to obtain a clear casting solution, which was then aged at 35°C for 1 day, cast after defoaming, and cast in the air. After evaporating for 30 seconds, enter the hydrochloric acid-water solution (pH = 1) to solidify and form a film. The film is soaked in the coagulation bath for about 25 minutes, then taken out and immersed in deionized water for 1 day.

[0040] At room temperature, the maximum strength and elastic modulus of the PVDF film without TEOS and the PVDF film containing TEOS were tested by GT-TS-2000 tensile strength tester. It is measured that the maximum strength of the film containing TEOS is 2.44MPa, and th...

Embodiment 3

[0041] Example 3 Preparation of polyvinylidene fluoride (PVDF) hybrid membrane containing additives (PVP and LiCl)

[0042] The casting solution is composed of PVDF, PVP, LiCl, DMF and TEOS, and the mass percentages are 14%, 2%, 4%, 64% and 16% respectively.

[0043] First, mix and stir quantitative PVDF, PVP, LiCl, DMF, and TEOS for a period of time to obtain a clarified casting solution, then mature it at 55°C for 2 days, and perform casting after defoaming. Evaporate in air for 30 seconds, then enter into hydrochloric acid-water solution (pH=1), solidify and form a film. The membrane continued to soak in the coagulation bath for about 25 minutes and then was removed and immersed in deionized water for 2 days.

[0044] At room temperature, the maximum strength and elastic modulus of the PVDF film without TEOS and the PVDF film containing TEOS were tested by GT-TS-2000 tensile strength tester. It is measured that the maximum strength of the film containing TEOS is 1.83MPa, ...

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Abstract

The present invention is preparation process of reinforced hybrid organic-inorganic film and belongs to the field of organic-inorganic separating film preparing technology. During the preparation of the reinforced hybrid organic-inorganic film, inorganic precursor is added directly into filming liquid of organic polymer to obtain the mixture film casting liquid comprising organic polymer 10-20 wt%, additive 0-10 wt%, solvent 55-80 wt% and inorganic precursor 0-24 wt%; the film casting liquid is then cured at 25-75 deg.c for 1-2 days before flow casting or spinning; the flow cast or extruded filming liquid is pre-evaporated in the air for 0-120 s before curing in solidification bath in pH 0.4-4 or pH 10-13; and the cured film is further soaked in the solidification bath for 5-25 min and soaked in pure water for 1-2 days. The reinforced hybrid organic-inorganic film has simplified preparation process and high mechanical strength.

Description

technical field [0001] The preparation method of enhanced organic-inorganic hybrid membrane belongs to the field of preparation of organic-inorganic separation membrane. Background technique [0002] In recent years, membrane technology has been gradually applied to urban water supply and sewage treatment. However, water treatment has put forward higher requirements for membrane permeability, pollution resistance and strength. Traditional ultrafiltration membranes cannot meet the needs of large-scale water treatment applications. . Therefore, some new membrane materials have been gradually developed, mainly polyvinylidene fluoride (PVDF), polyvinyl chloride (PVC), polysulfone (PSF), polyethersulfone (PES), polyacrylonitrile (PAN), polyimide Amine (PI), etc. Due to the large quality and complex types of pollutants in feed water, reclaimed water, and especially sewage, the membrane flux attenuation is serious, and frequent physical cleaning under high intensity is required t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/00
Inventor 彭跃莲刘晓娟
Owner BEIJING UNIV OF TECH
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