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Polyvinylidene fluoride hollow fiber membrane and preparation method thereof

A polyvinylidene fluoride, fiber membrane technology, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve problems such as poor compatibility and performance degradation, achieve good compatibility, improve flux, The effect of increasing porosity

Inactive Publication Date: 2011-12-07
HUIZHOU QIXIN MEMBRANE PURIFICATION & ENVIRONMENTPROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of polyvinylidene fluoride hollow fiber membrane can also be improved by adding polymer blending method, but the blending of two different polymers also has the disadvantage of poor compatibility. When the strength is increased, other properties will be reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] The present invention also provides a method for preparing a polyvinylidene fluoride hollow fiber membrane, wherein the hollow fiber membrane is prepared by a dry-wet method, that is, a non-solvent-induced phase separation method, and the preparation steps are as follows:

[0055] Step (1): First, put polyvinylidene fluoride, polymer pore-forming agent, surfactant, inorganic additives, water and solvent into the reaction kettle in a certain proportion, and stir at 50-90°C for more than 20 hours to fully evenly dissolve;

[0056] Step (2): Then, stop stirring, filter, vacuumize and defoam, and lower the temperature to obtain a casting solution at 40-80°C;

[0057] Step (3): Next, transport the casting solution to a sleeve-type spinneret with a temperature of 50-90°C, and pass through the inner hole with the inner coagulation solution to form an inner hole and extrude it into a hollow fiber;

[0058] Step (4): Finally, pass the hollow fiber through an air distance of 10-...

Embodiment 1

[0064] Embodiment 1: Take polyvinylidene fluoride 18%, polyethylene glycol 12%, polyvinylpyrrolidone 3%, Tween 2%, water 0.5%, nano silicon dioxide 1%, dimethylacetamide by weight percentage Put 63.5% into the reaction kettle, stir at 90°C for more than 20 hours, then stop stirring, filter, vacuumize and defoam and cool down to obtain a casting solution at 80°C, which is transported by a metering pump under nitrogen pressure To 80°C sleeve-type spinneret, the internal coagulation liquid of 60°C and 50% dimethylacetamide aqueous solution is passed into the sleeve, extruded into hollow fibers, and then passes through an air distance of 80mm, and enters 40°C, 10% The dimethylacetamide aqueous solution is coagulated in the external coagulation solution, and the hollow fiber membrane is stretched 50% in the external coagulation solution immediately, and then the membrane filaments are collected to obtain the polyvinylidene fluoride hollow fiber membrane. The prepared polyvinylidene...

Embodiment 2

[0067] Example 2: Weigh 17% of polyvinylidene fluoride, 15% of polyethylene glycol, 2% of Tween, 0.5% of water, 5% of nano-calcium carbonate, and 60.5% of dimethylacetamide in the reaction kettle by weight percentage , stirred at 90°C for more than 20 hours, then stopped stirring, filtered, vacuumed and degassed, and cooled to obtain a casting solution at 80°C. For the spinneret, the inner coagulation solution of 70°C and 50% dimethylacetamide aqueous solution is passed into the casing, extruded into hollow fibers, and then enters the outer coagulation solution of 40°C deionized water through an air distance of 50 mm for coagulation. And stretch 100% in the external coagulation solution, then collect the membrane filaments, extract the calcium carbonate in the hollow fiber membrane with hydrochloric acid, and obtain the polyvinylidene fluoride hollow fiber membrane. The inner diameter of the prepared polyvinylidene fluoride hollow fiber membrane is 0.62mm, the outer diameter i...

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Abstract

The invention relates to a polyvinylidene fluoride hollow fiber membrane and a preparation method thereof. The hollow fiber membrane uses polyvinylidene fluoride as the membrane material, and adds polymer pore-forming agents, surfactants, inorganic additives and solvents to make the casting liquid, and uses dry-wet method, that is, non-solvent-induced phase separation method to spin Process to prepare polyvinylidene fluoride hollow fiber membranes. The prepared polyvinylidene fluoride hollow fiber membrane has good flexibility and high strength at the same time, the tensile breaking strength is 3.5-6MPa; it has good hydrophilicity, and the pure water at a pressure of 0.1MPa and a temperature of 25°C The flux is 300~3200L / m2·H.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride hollow fiber membrane and a preparation method thereof by a non-solvent-induced phase separation method. Background technique [0002] With the continuous development of human industry, while obtaining huge economic benefits, the pollution of the environment is becoming more and more serious, especially the pollution of water, which seriously affects the survival of human beings. To solve the increasingly serious and complex water pollution problem, traditional separation technology has many shortcomings. Membrane separation technology has developed rapidly in recent years. Compared with traditional separation methods, membrane separation methods have low energy efficiency, no phase change, simple process, and environmental protection. No pollution and other advantages. Membrane separation technology has been widely used in chemical, food, pharmaceutical, electronics, electric power and other industri...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 刘冠文
Owner HUIZHOU QIXIN MEMBRANE PURIFICATION & ENVIRONMENTPROTECTION
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