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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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  • Summary
  • 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 inconvenient preparation process of the existing ultrafiltration membrane, a preparation method of a composite ultrafiltration membrane is provided

Method used

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  • Method for preparing composite ultrafiltration membrane

Examples

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example 1

[0024] Soak the filter paper in deionized water, crush it with a mixer and filter to obtain a filter residue, add a 10% ethanol solution at a mass ratio of 1:10, stir it magnetically, wash it three times with deionized water, and filter to obtain a filter paper pulp ; grind 5 times with a grinder, then homogenize 5 times with a high-pressure homogenizer to obtain cellulose pulp; mix hydrochloric acid and sulfuric acid at a volume ratio of 1:2 to obtain a mixed acid, and immerse the cellulose pulp in In the mixed acid, stir at a constant temperature at 80°C water bath temperature for 1h to obtain a mixed slurry, wash it with deionized water until neutral to obtain a colloidal solution, filter it with suction, dry it in an oven at 80°C for 1h, and pulverize it with a ball mill to obtain a crystal powder ; In parts by weight, take 10 parts of polyvinylidene fluoride, 3 parts of crystal powder, 3 parts of nanomaterials, 10 parts of polyvinyl alcohol, 40 parts of N, N-dimethylacetam...

example 2

[0026] Soak the filter paper in deionized water, crush it with a mixer, and filter to obtain a filter residue, add a 10% ethanol solution at a mass ratio of 1:10, stir it magnetically, wash it with deionized water for 4 times, and filter to obtain a filter paper pulp ; grind 5 times with a grinder, then homogenize 5 times with a high-pressure homogenizer to obtain cellulose pulp; mix hydrochloric acid and sulfuric acid at a volume ratio of 1:2 to obtain a mixed acid, and impregnate the cellulose pulp in In the mixed acid, stir at a constant temperature at 85 ° C for 1 h to obtain a mixed slurry, wash it with deionized water until neutral, obtain a colloidal solution, filter it with suction, dry it in an oven at 85 ° C for 1 h, and pulverize it with a ball mill to obtain a crystal powder ; In parts by weight, take respectively 15 parts of polyvinylidene fluoride, 5 parts of crystal powder, 4 parts of nanomaterials, 12 parts of polyvinyl alcohol, 50 parts of N, N-dimethylacetamid...

example 3

[0028]Soak the filter paper in deionized water, crush it with a mixer and filter it to obtain a filter residue, add a 10% ethanol solution in a mass ratio of 1:10, stir it magnetically, wash it with deionized water for 5 times, and filter it to obtain a filter paper pulp ; grind 5 times with a grinder, then homogenize 5 times with a high-pressure homogenizer to obtain cellulose pulp; mix hydrochloric acid and sulfuric acid at a volume ratio of 1:2 to obtain a mixed acid, and immerse the cellulose pulp in In the mixed acid, stir at a constant temperature for 2 hours at a water bath temperature of 90°C to obtain a mixed slurry, wash it with deionized water until neutral to obtain a colloidal solution, filter it with suction, dry it in an oven at 90°C for 2 hours, and pulverize it with a ball mill to obtain a crystal powder ; In parts by weight, respectively weigh 20 parts of polyvinylidene fluoride, 7 parts of crystal powder, 5 parts of nanomaterials, 14 parts of polyvinyl alcoho...

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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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