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Polyvinylidene fluoride hollow fiber film and preparation method thereof

A technology of polyvinylidene fluoride and polyvinylidene fluoride resin, which is applied in the field of polyvinylidene fluoride hollow fiber membranes and its preparation, can solve problems such as easy deterioration, achieve uniform mixing time reduction, pure water flux and average pore size Effect of size increase and reduction of membrane surface energy

Active Publication Date: 2012-09-19
江苏美能膜材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyvinylidene fluoride-based resin constituting the membrane is easily degraded due to the use of a strong alkaline aqueous solution when extracting hydrophobic silica

Method used

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  • Polyvinylidene fluoride hollow fiber film and preparation method thereof
  • Polyvinylidene fluoride hollow fiber film and preparation method thereof
  • Polyvinylidene fluoride hollow fiber film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 15% active nano zinc oxide, 45% polyvinylidene fluoride (molecular weight 250,000-400,000), 25% dioctyl phthalate, 10% dibutyl phthalate and 5% dimethylacetamide, in The high-speed mixer mixes at high speed to make the solids evenly disperse the organic phase, and then use a twin-screw extruder (screw diameter Length-to-diameter ratio: 40:1), control the temperature of the cylinder at 180°C for mixing, pass through an annular gap with an outer diameter of 6mm and an inner diameter of 3mm, control the temperature of the nozzle at 190°C, and pass it at 5ml / min The air flow is injected into the hollow of the filament, and the hollow filament is extruded from the center of the nozzle with an exhaust rate of 15ml / min. The extruded hollow filaments are introduced into a pure water coagulation cooling bath 20mm away from the nozzle mouth, the temperature is controlled at 50°C, and pulled from the coagulation cooling bath at a speed of 10m / min to another 60°C constant temperat...

Embodiment 2

[0050] Using the formula and preparation method of Example 1, the difference is that the cooling medium in the coagulation cooling bath is a mixed medium containing 5% dimethylacetamide and 95% water, and the residual amount of zinc in the prepared porous membrane silk is less than 0.5%.

[0051] The prepared polyvinylidene fluoride hollow fiber porous membrane has an outer diameter of 1.21 mm, an inner diameter of 0.58 mm, a porosity of 74.8%, an average pore diameter of 0.18 μm on the membrane surface, and a pure water flux of 2000 L / m 2 hr0.1MPa, 25℃, tensile breaking strength 11MPa, tensile breaking elongation 190%, anti-crush strength> 0.8MPa.

Embodiment 3

[0053] 18% active nano calcium carbonate and 42% polyvinylidene fluoride (molecular weight 250,000-400,000), 25% dioctyl phthalate, 10% dibutyl phthalate and 5% dimethylacetamide, in The high-speed mixer mixes at high speed to make the solids evenly disperse the organic phase weight, and then use a twin-screw extruder (screw diameter Length-to-diameter ratio: 40:1), control the temperature of the cylinder at 180°C for mixing, pass through an annular gap with an outer diameter of 6mm and an inner diameter of 3mm, control the temperature of the nozzle at 190°C, and pass it at 5ml / min The air flow is injected into the hollow of the filament, and the hollow filament is extruded from the center of the nozzle with an exhaust rate of 15ml / min. The extruded hollow filaments are introduced into a pure water coagulation cooling bath 20mm away from the nozzle mouth, the temperature is controlled at 50°C, and pulled from the coagulation cooling bath at a speed of 10m / min to another 60°C ...

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Abstract

The invention discloses a polyvinylidene fluoride hollow fiber film and a preparation method thereof. The polyvinylidene fluoride hollow fiber film comprises the following components by weight percent: 20-60% of polyvinylidene fluoride resin, 10-50% of organic pore-forming agent, 1-30% of inorganic pore-forming agent and 5-30% of solvent. The preparation method comprises the following steps: mixing, squeezing, cooling, stretching, extracting the organic pore-forming agent and the inorganic pore-forming agent, and thermally shaping. The obtained polyvinylidene fluoride hollow fiber film has the advantages of high strength, good performance, better hydrophilicity, simple preparation process and energy saving.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride hollow fiber membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a membrane material with excellent performance. Due to its hydrophobicity, heat resistance, chemical stability, radiation resistance and good physical and mechanical properties, it can be cleaned with commonly used oxidizing agents. In recent years, it has been widely used in the preparation of separation membranes, and has been widely used in various aspects such as industrial wastewater treatment, domestic water production, food industry and medical fields. [0003] The preparation method of polyvinylidene fluoride hollow fiber is mainly prepared by solution phase transfer method (NIPS method) at the earliest. Chinese patents CN95117497T and CN98103153 describe in detail the preparation by wet method and dry-wet method spinning technology, mix the original film-forming compound, ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/08
CPCB01D71/34B01D69/02B01D2325/24B01D2325/36B01D69/087B01D67/003B01D69/08B01D67/0027
Inventor 杨新浩葛海霖
Owner 江苏美能膜材料科技有限公司
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