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Polyvinylidene fluoride organic-inorganic hybrid membrane and preparation method thereof

A polyvinylidene fluoride and hybrid membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of unsatisfactory hydrophilicity and low flux of PVC blended ultrafiltration membranes.

Inactive Publication Date: 2012-05-02
SANDA FILM SCI & TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are more than a dozen kinds of organic blend modifications of PVDF reported, and the inorganic modifications mainly include SiO 2 、TiO 2 , LiClO 4 、Al 2 o 3 etc., but the hydrophilicity of PVC blended ultrafiltration membranes on the market is still not ideal, resulting in low flux

Method used

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  • Polyvinylidene fluoride organic-inorganic hybrid membrane and preparation method thereof
  • Polyvinylidene fluoride organic-inorganic hybrid membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Under high-speed stirring, dissolve 25 grams of silicon dioxide and 5 grams of Tween-20 in 3 kilograms of N-methylpyrrolidone. After stirring evenly, add 570 grams of N-methylpyrrolidone and 720 grams of polyvinylidene fluoride. Powder (polymerization degree 250,000), 180 grams of polyvinyl butyral, 500 grams of polyethylene glycol 10000, stirring and dissolving evenly, the stirring temperature is 70 ° C, standing for defoaming for 24 hours; spinning, spinning core liquid and outer The coagulation bath is water at 25°C. After passing through the filter screen, the casting film is extruded from the spinneret together with the core liquid. After walking 15cm in the air, it enters the external coagulation bath for forming and is wound by the winding wheel. The thus obtained polyvinylidene fluoride organic-inorganic hybrid membrane is soaked in pure water (15-35° C. at room temperature) for 48 hours, and then soaked in glycerin water (20-35% by mass of glycerol) for 12 hours...

Embodiment 2

[0023] Under high-speed stirring, dissolve 200 grams of alumina and 125 grams of Tween-80 in 3 kilograms of dimethylacetamide, stir well, then add 125 grams of dimethylacetamide and 1150 grams of polyvinylidene fluoride powder (Polymerization degree 150,000), 200 grams of polymethyl methacrylate, 200 grams of polyvinyl pyrrolidone, stirring and dissolving evenly, the stirring temperature is 85 ℃, stand for defoaming for 24 hours; It 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 thus obtained polyvinylidene fluoride organic-inorganic hybrid membrane is soaked in pure water (15-35° C. at room temperature) for 48 hours, and then soaked in glycerin water (20-35% by mass of glycerol) fo...

Embodiment 3

[0025] Under high-speed stirring, 100 grams of titanium dioxide and 100 grams of Tween-60 were dissolved in 2560 grams of dimethylacetamide. After stirring evenly, 640 grams of dimethylformamide and 750 grams of polyvinylidene fluoride powder were added ( The degree of polymerization is 155,000), 500 grams of polypropylmethacrylate, 250 grams of polyethylene glycol 6000, and 100 grams of polyvinylpyrrolidone, stir and dissolve evenly, the stirring temperature is 75 ° C, and stand for defoaming for 24 hours; spinning, spinning Both the 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. winding. The thus obtained polyvinylidene fluoride organic-inorganic hybrid membrane is soaked in pure water (15-35° C. at room temperature) for 48 hours, and then soaked in glycerin water (20-35% by mass of glycerol) for 12 hours. The obtained high-flux po...

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Abstract

The invention relates to a polyvinylidene fluoride membrane and a preparation method thereof, and specially, relates to a polyvinylidene fluoride organic-inorganic hybrid membrane and a preparation method thereof. A casting solution of the polyvinylidene fluoride organic-inorganic hybrid membrane comprises 14 to 25% of polyvinylidene fluoride, 3 to 12% of one or more mixed polymers, 0.2 to 5% of one or more inorganic nanometer additives, 4 to 12% of one or more hydrophilic pore-forming agents, 0.05 to 3% of a surfactant and 50 to 80% of one or two solvents. The casting solution is prepared and then is processed into a polyvinylidene fluoride organic-inorganic hybrid membrane finished product through a dry-wet spinning technology. Compared with the prior art, the preparation method adopts hydrophilic mixtures and hydrophilic inorganic nanometer particles simultaneously and thus further improving membrane wire hydrophily, membrane flux and membrane contamination resistance.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride film and a preparation method thereof, in particular to a polyvinylidene fluoride organic-inorganic hybrid film and a preparation method thereof. Background technique [0002] Due to the characteristics of operation at room temperature, no phase change, high efficiency and energy saving, and no pollution in the production process, membrane separation technology is widely used in drinking water purification, industrial water treatment, food and beverage water purification, sterilization, and recovery of biologically active substances. , refining and other aspects have been widely used, and rapidly extended to textile, chemical, electric power, food, metallurgy, petroleum, machinery, biology, pharmaceuticals, fermentation and other fields. Due to its unique structure and performance, separation membranes have emerged in environmental protection and water resource regeneration, and have broad application ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/08
Inventor 洪昱斌林汉阳蓝伟光
Owner SANDA FILM SCI & TECH XIAMEN
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