Method for preparing composite ultrafiltration membrane

An ultrafiltration membrane and filter residue technology, applied in the field of water treatment, can solve the problems of short service life, inconvenient preparation process, low water permeability of ultrafiltration membrane, etc. Effect

Inactive Publication Date: 2018-11-23
黄勇
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention: Aiming at the problems of low water permeability, short service life and inc

Method used

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  • Method for preparing composite ultrafiltration membrane

Examples

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Example Embodiment

[0023] Example 1

[0024] The filter paper is soaked in deionized water, broken by a mixer and filtered to obtain a filter residue. Add a 10% mass fraction of ethanol solution at a mass ratio of 1:10. After magnetic stirring, wash with deionized water for 3 times and filter to obtain filter paper pulp. ; After grinding 5 times with a grinder, and then homogenizing 5 times with a high-pressure homogenizer, the cellulose pulp is obtained; the hydrochloric acid and sulfuric acid are mixed in a volume ratio of 1:2 to obtain a mixed acid, and the cellulose pulp is impregnated in In the mixed acid, stir at a constant temperature of 80℃ water bath for 1 hour to obtain a mixed slurry, wash with deionized water to neutrality to obtain a colloidal solution, filter with suction, dry in an oven at 80℃ for 1 hour, then pulverize with a ball mill to obtain crystal powder ; In parts by weight, respectively weigh 10 parts of polyvinylidene fluoride, 3 parts of crystalline powder, 3 parts of nano...

Example Embodiment

[0025] Example 2

[0026] The filter paper is soaked in deionized water, broken by a mixer and filtered to obtain a filter residue. Add a 10% ethanol solution with a mass fraction of 1:10. After magnetic stirring, wash with deionized water 4 times and filter to obtain filter paper pulp. ; After grinding 5 times with a grinder, and then homogenizing 5 times with a high-pressure homogenizer, the cellulose pulp is obtained; the hydrochloric acid and sulfuric acid are mixed in a volume ratio of 1:2 to obtain a mixed acid, and the cellulose pulp is impregnated in In the mixed acid, stir for 1 hour at a temperature of 85°C in a water bath to obtain a mixed slurry, wash with deionized water to neutrality to obtain a colloidal solution, filter with suction, dry in an oven at 85°C for 1 hour, and pulverize with a ball mill to obtain crystal powder ; In parts by weight, respectively weigh 15 parts of polyvinylidene fluoride, 5 parts of crystalline powder, 4 parts of nanomaterials, 12 parts...

Example Embodiment

[0027] Example 3

[0028] The filter paper is soaked in deionized water, broken by a mixer and filtered to obtain a filter residue. Add a 10% mass fraction of ethanol solution at a mass ratio of 1:10. After magnetic stirring, wash with deionized water for 5 times and filter to obtain filter paper pulp. ; After grinding 5 times with a grinder, and then homogenizing 5 times with a high-pressure homogenizer, the cellulose pulp is obtained; the hydrochloric acid and sulfuric acid are mixed in a volume ratio of 1:2 to obtain a mixed acid, and the cellulose pulp is impregnated in In the mixed acid, stir at a constant temperature of 90℃ for 2 hours in a water bath to obtain a mixed slurry, wash with deionized water to neutrality to obtain a colloidal solution, filter with suction, dry in an oven at 90℃ for 2 hours, then pulverize with a ball mill to obtain crystal powder ; In parts by weight, respectively weigh 20 parts of polyvinylidene fluoride, 7 parts of crystalline powder, 5 parts ...

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Abstract

The invention relates to a method for preparing a composite ultrafiltration membrane, and belongs to the technical field of water treatment. The composite ultrafiltration membrane is prepared by a sol-gel method. Silica and titanium dioxide are added to a casting solution, and the phase splitting process in the film formation process is controlled by means of the unique chain structure of the silica and the hydroxyl group on the surface thereof. The blending of nano titanium dioxide and a membrane material can enhance the hydrophilicity of the membrane, increase the membrane flux, improve theroughness of the membrane surface, delay membrane fouling, prolong the service life of the membrane, and reduce the operating cost of the membrane device. The porosity of the composite ultrafiltrationmembrane is gradually increased, and the water flux is gradually increased. A hydrogen bond may also be formed between polyvinylidene fluoride and cellulose micro/nano crystal, which enables the cellulose micro/nano crystal to be uniformly dispersed in a polyvinylidene fluoride solution, and have good interface bonding with the polyvinylidene fluoride, so that the composite membrane has certain strength and toughness, and thus the composite membrane exhibits good mechanical properties.

Description

technical field [0001] The invention relates to a preparation method of a composite ultrafiltration membrane, belonging to the technical field of water treatment. Background technique [0002] The ultrafiltration membrane is measured according to the minimum particle size or molecular weight that the membrane layer can actually retain. At present, the rated pore size range of the membrane is used as the distinguishing standard, and the microporous filtration membrane with a rated pore size range of 0.001-0.02 μm is called an ultrafiltration membrane. The other is to classify according to the molecular weight cut-off, which is generally called ultrafiltration with a molecular weight cut-off of 5,000 to 1 million Daltons. [0003] There are many classification methods for ultrafiltration membranes. Here, the ultrafiltration membranes are classified according to the different membrane materials, which are divided into three categories: organic membranes (polymer membranes), in...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D71/44
CPCB01D67/0011B01D69/02B01D69/12B01D71/44B01D2325/24
Inventor 黄勇张鑫朱华
Owner 黄勇
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