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Self-healing polymeric water-treatment membrane and preparation method thereof

A water treatment membrane and polymer technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as rupture, achieve the effects of repairing membrane cracks, improving mechanical strength, and avoiding further damage

Active Publication Date: 2017-07-14
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a water treatment membrane with self-repair function and its preparation method to solve the problem that the water treatment membrane is broken under the action of long-term pressure driving force or under the action of backwash high pressure after being mechanically damaged.

Method used

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  • Self-healing polymeric water-treatment membrane and preparation method thereof
  • Self-healing polymeric water-treatment membrane and preparation method thereof
  • Self-healing polymeric water-treatment membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The preparation method of the self-healing polymer water treatment membrane comprises the following steps:

[0027] (1) Preparation of dispersion: by pretreating carbon nanoscrolls at high temperature under argon flow, toluene diisocyanate (TDI) and diphenylmethane diisocyanate-diethylene glycol (MDI) (volume ratio 1:1) Stir at room temperature in a nitrogen atmosphere for 1-2 hours, slowly add carbon nanocoils with a diameter of 0.1 μm and a length of 100 μm after high-temperature pretreatment, and the mass ratio of carbon nanocoils to repairing agent is 1:49. Ultrasonic dispersion of nanoscrolls at -5°C low temperature, after filtration, add 5 g of the carbon nanoscrolls containing repairing agent to 50 g of acetone containing 0.2% sodium dodecylbenzene sulfate, and mix the acetone solution with N,N-dimethyl formaldehyde Amides were ultrasonically mixed at a volume ratio of 10:100 to prepare a carbon nanoscroll dispersion with a mass percentage of carbon nanoscrolls o...

Embodiment 2

[0031] The preparation method of the self-healing polymer water treatment membrane comprises the following steps:

[0032] (1) Preparation of dispersion: by pretreating carbon nanoscrolls at high temperature under argon flow, toluene diisocyanate (TDI) and diphenylmethane diisocyanate-diethylene glycol (MDI) (volume ratio 1:1) Stir at room temperature in a nitrogen atmosphere for 1-2 hours, slowly add high-temperature pretreated carbon nanoscrolls with a diameter of 0.1 μm and a length of 100 μm, the mass ratio of carbon nanoscrolls and repairing agent is 5:95, and the repairing agent and carbon Ultrasonic dispersion of nanoscrolls at low temperature -5°C, after filtration, add 5 g of the carbon nanoscrolls to 50 g of acetone containing 0.1% Tween-85, and mix the acetone solution with N,N-dimethylformamide at a volume ratio of 20:100 A carbon nanoscroll dispersion liquid with a carbon nanoscroll mass percentage of 1.6% was prepared by ultrasonic mixing.

[0033] (2) Preparati...

Embodiment 3

[0036](1) Preparation of dispersion: by pretreating carbon nanoscrolls at high temperature under argon flow, toluene diisocyanate (TDI) and diphenylmethane diisocyanate-diethylene glycol (MDI) (volume ratio 1:1) Stir at room temperature for 1-2 hours in a nitrogen atmosphere, slowly add carbon nanoscrolls with a diameter of 0.1 μm and a length of 100 μm, the mass ratio of carbon nanoscrolls and repairing agent is 10:90, and the repairing agent and carbon nanoscrolls at low temperature -5 ℃ Ultrasonic dispersion, after filtration, add 10g of the carbon nanoscrolls to 50g of acetone containing 0.5% sodium dodecylbenzene sulfate, and ultrasonically mix the acetone solution with N,N-dimethylformamide at a volume ratio of 10:100 A carbon nanoscroll dispersion liquid with a mass percentage of carbon nanoscrolls of 1.8% was obtained.

[0037] (2) Preparation of casting solution: dissolve polyvinylidene fluoride at 60°C in a mixed solvent composed of acetone and dimethylacetamide (the...

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Abstract

The invention relates to a preparation method of a self-healing polymeric water-treatment membrane and belongs to the field of functional polymeric membrane materials. After ultrasonic mixing of a dispersion and a membrane casting solution, the mixture is cast into a flat sheet membrane or spun into a hollow fiber membrane through a phase separation method so as to obtain the self-healing polymeric water-treatment membrane. According to the healing mechanism of the self-healing water-treatment membrane, an isocyanate-terminated healing agent is contacted with water for crosslinking and then the healing material and the membrane material are rapidly combined so as to eliminate cracks generated under external force. During the water treatment process of the self-healing water-treatment membrane, the treatment will not be interrupted because of rupture of the membrane; however, under the water flow action, the membrane will rapidly react with the healing agent so as to rapidly heal the membrane ruptures.

Description

technical field [0001] The invention relates to a preparation method of a self-repairing polymer water treatment membrane. The invention belongs to the field of functional polymer membrane materials. Background technique [0002] Membrane separation is an emerging high-efficiency separation technology. At present, it has been widely used in chemical industry, electronics, light industry, textile, metallurgy, petroleum, food, medicine, water treatment and other industries. Compared with traditional separation technology, membrane separation technology has the advantages of normal temperature operation, no phase change, high separation efficiency, low energy consumption, simple process, convenient operation, easy scale-up and self-control. However, in membrane separation technology, the loss and pollution of membrane materials have always been obstacles to the comprehensive and large-scale application of membrane technology. [0003] In recent years, studies have found that...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D71/02B01D69/02B01D67/00
CPCB01D67/0079B01D69/02B01D71/021B01D71/06
Inventor 马文中赵宇辰杨海存龚方红刘春林陶国良
Owner CHANGZHOU UNIV
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