Polyvinylidene fluoride membrane and preparation method thereof

A technology of polyvinylidene fluoride film and polyvinylidene fluoride resin, which is applied in the field of film and its preparation, can solve the problems of not being able to simultaneously improve the water flux and mechanical strength of the adsorption film, so as to ensure long-lasting hydrophilicity and improve the purity Water flux, simple effect of preparation method

Active Publication Date: 2014-12-24
安徽指南针科创园发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a polyvinylidene fluoride hollow fiber membrane with excellent hydrophilic performance, high pure water flux, and high mechanical strength and its preparation method, so as to overcome the easy adsorption of pollutants on the membrane surface and in the membrane pores and solve the problem of membrane water pollution. The problem that flux and mechanical strength cannot be improved at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) According to the following components and weight percentages, the raw materials of the casting solution are dissolved evenly in the stirring tank, the stirring temperature is 70°C, and the casting solution is obtained by standing for defoaming, and the temperature of the casting solution is 50°C.

[0043] Components: polyvinylidene fluoride resin 15%, diatomaceous earth 3%, amphiphilic copolymer (polyether modified silicone oil) 4%, organic porogen (polyethylene glycol) 5%, organic porogen ( polyvinylpyrrolidone) 5%, inorganic porogen (lithium chloride) 2%, surfactant (sodium lauryl sulfate) 1%, solvent (dimethylacetamide) 65%.

[0044](2) The hollow fiber membrane is spun by a conventional dry-wet spinning process. After passing through the filter screen, the casting liquid is extruded from the spinneret together with the core liquid, and after walking 7cm in the air, it enters the external coagulation bath to form, and is wound by the winding wheel. Among them, t...

Embodiment 2

[0047] (1) According to the following components and weight percentages, the raw materials of the casting solution are dissolved evenly in the stirring tank, the stirring temperature is 70°C, and the casting solution is obtained by standing for defoaming, and the temperature of the casting solution is 50°C.

[0048] Components: polyvinylidene fluoride resin 16%, diatomite 3%, amphiphilic copolymer (polyether modified silicone oil) 3%, organic porogen (glycerol) 4%, organic porogen (poly vinylpyrrolidone) 7%, inorganic porogen (lithium chloride) 1%, surfactant (sodium dodecylbenzenesulfonate) 1%, solvent (N-methylpyrrolidone) 65%.

[0049] (2) The hollow fiber membrane is spun by a conventional dry-wet spinning process. After passing through the filter screen, the casting liquid is extruded from the spinneret together with the core liquid, and after walking 7cm in the air, it enters the external coagulation bath to form, and is wound by the winding wheel. Among them, the c...

Embodiment 3

[0052] (1) According to the following components and weight percentages, the raw materials of the casting solution are dissolved evenly in the stirring tank, the stirring temperature is 75°C, and the casting solution is obtained by standing for defoaming, and the temperature of the casting solution is 50°C.

[0053] Components: polyvinylidene fluoride resin 17%, diatomaceous earth 2%, amphiphilic copolymer (polyoxyethylene-polypropylene-polyoxyethylene) 3%, organic porogen (polyethylene glycol) 8%, Organic porogen (polyvinyl alcohol) 3%, inorganic porogen (lithium nitrate) 1.5%, surfactant (Tween-80) 1.5%, solvent (dimethylformamide) 64%.

[0054] (2) The hollow fiber membrane is spun by a conventional dry-wet spinning process. After passing through the filter screen, the casting liquid is extruded from the spinneret together with the core liquid, and after walking 5cm in the air, it enters the external coagulation bath to be formed, and is wound by the winding wheel. Amo...

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Abstract

The invention relates to a polyvinylidene fluoride membrane. The membrane casting liquid comprises the following components in percentage by weight: 10-25% of polyvinylidene fluoride resin, 1-4% of diatomite, 1-5% of amphiphilic copolymer, 4-12% of organic pore-forming agent, 0.2-3% of inorganic pore-forming agent, 0.1-3% of surfactant and the balance of solvent. According to the polyvinylidene fluoride membrane, the diatomite and the amphiphilic copolymer are added; by virtue of the diatomite, the mechanical strength and pure water flux of the membrane are improved; the amphiphilic copolymer and polyvinylidene fluoride have good compatibility; the combination force is strong; the copolymer is unlikely to run off and the continuous hydrophily of the membrane is guaranteed. The invention further relates to a preparation method of the polyvinylidene fluoride membrane. The preparation method comprises the following steps: (1) uniformly stirring the membrane casting liquid, standing and defoaming; (2) enabling the membrane casting liquid to vertically flow in the air by virtue of a spinning spinneret, so that the membrane casting liquid enters the coagulating bath and is cured and formed; (3) soaking the spun and formed polyvinylidene fluoride membrane in pure water and a glycerol water solution in sequence and drying so as to obtain the polyvinylidene fluoride membrane.

Description

technical field [0001] The invention relates to a film and a preparation method thereof, belonging to the field of film technology, in particular to a polyvinylidene fluoride film intended to improve the performance of the polyvinylidene fluoride film and a preparation method thereof. Background technique [0002] Membrane separation technology is a new type of high-efficiency separation technology. Its separation process has the advantages of low energy consumption, good separation performance, and no secondary pollution. It has been widely used in the fields of chemical industry, energy, medicine, food, environmental protection, and water treatment. The application of it has become one of the common supporting technologies to solve major problems faced by human beings such as energy, environment, and water resources, and is considered to be one of the most promising high-tech technologies in the 21st century. Separation membrane materials with excellent performance are the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00
Inventor 李亮林黑牯
Owner 安徽指南针科创园发展有限公司
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