Polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane and preparation method thereof

A polyvinylidene fluoride and polyacrylonitrile technology, applied in the field of polyvinylidene fluoride/polyacrylonitrile alloy membrane and its preparation, can solve the problem of easy adsorption, lower membrane permeability and final membrane separation performance, replacement and maintenance of membrane components Increased costs, etc.

Active Publication Date: 2013-01-16
SUNTAR MEMBRANE ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the protein water system as an example, the protein is easy to adsorb to the membrane surface or block the membrane pores on the surface, reducing the permeability of the membrane and the final separation performance of the membrane.
This feature of membrane life attenuation will lead to an increase in membrane module replacement and maintenance costs during its application [Fu Liu, N.Awanis Hashim, Yutie Liu, M.R.Moghareh Abed, K.Li.Progress in the production and modification of PVDF membranes , Journal of Membrane Science 375(2011) 1–27]

Method used

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  • Polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane and preparation method thereof
  • Polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane and preparation method thereof
  • Polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Under high-speed stirring, dissolve 50 grams of silicon dioxide and 10 grams of Tween-20 in 6 kilograms of N-methylpyrrolidone, stir well, then add 1640 grams of N-methylpyrrolidone and 1440 grams of polyvinylidene fluoride Powder (polymerization degree 250,000), 360 grams of polyacrylonitrile powder (molecular weight 50,000), 500 grams of polyethylene glycol 10,000, stir to dissolve evenly, stirring temperature is 70 ° C, stand for defoaming for 24 hours; spinning, spinning core Both the casting liquid and the external coagulation bath are water at 25°C. After passing through the filter screen, the casting film liquid is extruded from the spinneret together with the core liquid. around. The resulting polyvinylidene fluoride / polyacrylonitrile organic-inorganic hybrid hollow fiber membrane was soaked in pure water (room temperature 15-35°C) for 48 hours, then soaked in glycerin water (glycerin mass percentage 10-35%) The high-flux polyvinylidene fluoride / polyacrylonitri...

Embodiment 2

[0045] Under high-speed stirring, dissolve 400 grams of alumina and 250 grams of Tween-80 in 6 kilograms of dimethylacetamide, stir well, then add 250 grams of dimethylacetamide and 2300 grams of polyvinylidene fluoride powder (Polymerization degree 150,000), 400 grams of polyacrylonitrile (molecular weight: 80,000), 400 grams of polyvinylpyrrolidone, stir to dissolve evenly, stirring temperature is 75 ° C, stand for 24 hours for defoaming; spinning, spinning core liquid and external coagulation The bath is a mixture of water and solvent at 40°C (water is 80%; solvent is dimethylacetamide, accounting for 20%). After the casting liquid passes through the filter screen, it is extruded from the spinneret together with the core liquid , after walking 5cm in the air, it enters the outer coagulation bath to form, and is wound by the winding wheel. The resulting polyvinylidene fluoride / polyacrylonitrile organic-inorganic hybrid hollow fiber membrane was soaked in pure water (room tem...

Embodiment 3

[0047]Under high-speed stirring, dissolve 200 grams of titanium dioxide and 200 grams of Tween-60 in 5120 grams of dimethylacetamide, stir well, then add 1280 grams of dimethylformamide and 1500 grams of polyvinylidene fluoride powder ( The degree of polymerization is 155,000), 1000 grams of polyacrylonitrile (molecular weight: 30,000), 500 grams of polyethylene glycol 6000, and 200 grams of polyvinylpyrrolidone. Stir to dissolve evenly. Both the spinning core liquid and the external coagulation bath are water at 45°C. After passing through the filter screen, the casting film liquid is extruded from the spinneret together with the core liquid. The wire wheel is wound. The resulting polyvinylidene fluoride / polyacrylonitrile organic-inorganic hybrid hollow fiber membrane was soaked in pure water (room temperature 15-35°C) for 48 hours, then soaked in glycerin water (glycerin mass percentage 10-35%) The high-flux polyvinylidene fluoride / polyacrylonitrile organic-inorganic hybrid...

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Abstract

The invention relates to a polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane and a preparation method thereof. Membrane-casting liquid of the fiber membrane comprises the following components in percentage by weight: 14 to 25 percent of polyvinylidene fluoride, 1 to 12 percent of polyacrylonitrile, 4 to 15 percent of organic-inorganic compound additive and 50 to 80 percent of solvent. After the membrane-casting liquid is prepared, the finished polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane is prepared by a dry-wet spinning process. Compared with the prior art, the preparation method has the advantages that a hydrophilic blend and the novel organic-inorganic compound additive are added, so that the strength and the hydrophilcity of membrane fiber is further improved; and compared with a relatively pure polyvinylidene fluoride membrane, the prepared polyvinylidene fluoride/polyacrylonitrile organic-inorganic hybrid hollow fiber membrane has the advantages that the performance of is greatly improved, and the application field of the membrane is greatly widened.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride / polyacrylonitrile alloy membrane and a preparation method thereof, in particular to a polyvinylidene fluoride / polyacrylonitrile organic-inorganic hybrid hollow fiber membrane and a preparation method thereof. Background technique [0002] With the further expansion of China's economic scale and the continuous improvement of people's living standards, the demand for energy and resources will increase sharply. Among China's 669 cities, 400 lack water supply and 110 are seriously short of water, which will become one of the main factors restricting the sustainable development of my country's national economy. In order to ensure the sustainable development of China's economy, research on new materials and equipment of environmental protection and energy saving is very necessary. Hollow fiber (such as polyvinylidene fluoride (PVDF) and its blended modification system) membranes and corresponding components...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00D01F1/08
Inventor 洪昱斌陈慧英苏吉龙蓝伟光
Owner SUNTAR MEMBRANE ENVIRONMENT TECH
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