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High-strength high-flux hollow fiber membrane and preparation method thereof

A high-flux, fiber-membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of low water flux and low strength of hollow fiber membranes, and achieve stable performance, enhanced strength, technically simple effect

Inactive Publication Date: 2011-11-02
北京伟思德克科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hollow fiber membrane of the present invention solves the disadvantages of low strength and low water flux of the hollow fiber membrane prepared by the traditional non-solvent-induced phase separation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 0.85kg of ultra-high molecular weight polyvinylidene fluoride (weight average molecular weight 750,000), 0.5kg of polyvinylpyrrolidone K30, 0.5kg of hydrophilic nano-scale silica with a particle size of 20nm, and 3.15kg of N, N-di Methylacetamide is mixed, stirred and dissolved in a stirred tank at 120°C to obtain a uniform and stable feed liquid, and the stirring speed is 300 rpm; then transported by a single-screw conveying device, and vacuum degassed in the single-screw conveying section to form Uniform casting solution; the casting solution is extruded through the metering pump and spinneret, and then enters the gel bath for solidification. The outside of the membrane filament is formed by the gel bath, and the inside is formed by the core liquid gel to form a hollow Fiber inner cavity, thereby forming nascent hollow fiber membrane, described core liquid and gel bath are all 30% N, the aqueous solution of N-dimethylacetamide, and the outer diameter of the membrane si...

Embodiment 2

[0041] Embodiment 2: 1kg of ultra-high molecular weight polyvinylidene fluoride (weight-average molecular weight 750,000), 0.3kg of polyvinylpyrrolidone K30, 0.75kg of nano-scale calcium carbonate with a particle size of 10nm, 2.95kg of N, N-dimethyl Mix base acetamide, stir and dissolve in a stirring tank at 120°C to obtain a uniform and stable feed liquid, the stirring speed is 600 rpm; then transport through a single-screw conveying device, vacuum degassing in the single-screw conveying section to form a uniform Casting solution; the casting solution is extruded through a metering pump and a spinneret, and then enters a gel bath for solidification. The exterior of the membrane filament is formed by the gel bath, and the interior is formed by the core liquid gel to form the interior of the hollow fiber Cavities, thereby forming nascent hollow fiber membranes, the core liquid and the gel bath are both 20% N, N-dimethylacetamide aqueous solution, the outer diameter of the membr...

Embodiment 3

[0043] Embodiment 3: the polyvinylidene fluoride (weight-average molecular weight 900,000) of the ultrahigh molecular weight of 0.75kg, 1kg polyvinylpyrrolidone K60, 0.75kg particle size are the nanoscale calcium carbonate of 50nm, 2.5kg of N, N-two Methylacetamide is mixed, stirred and dissolved in a stirred tank at 120°C to obtain a uniform and stable feed liquid, and the stirring speed is 900 rpm; then transported by a single-screw conveying device, and vacuum degassed in the single-screw conveying section to form Uniform casting solution; the casting solution is extruded through the metering pump and spinneret, and then enters the gel bath for solidification. The outer part of the membrane filament is formed by the gel bath, and the inner part is formed by the core liquid gel to form a hollow fiber Internal cavity, thereby forming nascent hollow fiber membranes, the core liquid and gel bath are both 50% N, N-dimethylacetamide aqueous solution, the outer diameter of the memb...

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Abstract

The invention discloses a high-strength and high-flux hollow fiber membrane and a preparation method thereof. The method is characterized by comprising the following main steps: taking ultrahigh molecular weight polyvinylidene fluoride as a raw material and adding nano-size inorganic additives, PVP (polyvinyl pyrrolidone) and a solvent to the raw material for mixing; using a single screw to transmit a feed liquid at the condition of even dissolving and high-speed stirring in a stirred tank; carrying out vacuum defoaming on one section of the single screw; using a metering pump and a spinning nozzle to extrude; and adopting acid or alkali to wash after the gel is coagulated in a gel groove, thus obtaining the high-strength and high-flux polyvinylidene fluoride hollow fiber membrane. The external diameter, the internal diameter and the bore diameter of a membrane wire of the high-strength and high-flux hollow fiber membrane are 1200 micrometer, 600 micrometer and 0.06-0.2 micrometer respectively, thus solving the problems that a hollow fiber membrane prepared by a traditional non-solvent phase separation method is low in strength and small in water flux.

Description

technical field [0001] The invention relates to a hollow fiber membrane and a preparation method thereof, in particular to a high-strength and high-flux hollow fiber membrane using ultra-high molecular weight polyvinylidene fluoride as a raw material and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride is a fluorine-containing polymer, a linear crystalline polymer, its crystallinity is generally between 55% and 80%, and because of the high binding energy of fluorine-carbon bonds, it has good heat resistance and corrosion resistance, and can be Suitable for -40~150℃, resistant to corrosion and swelling of oxidants, acids, alkalis, salts, halogens, aromatic hydrocarbons, aliphatic hydrocarbons and chlorinated solvents, and has excellent anti-ultraviolet and aging resistance. Since polyvinylidene fluoride is only soluble in a small amount of solvent, a non-solvent-induced phase separation method is usually used to prepare polyvinylidene fluori...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 丁怀宇陈观文王效宁
Owner 北京伟思德克科技有限责任公司
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