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Polyacrylonitrile/polyvinylidene fluoride alloy hollow fiber membrane and preparation method thereof

A technology of polyvinylidene fluoride and polyacrylonitrile, which is applied in the field of polyacrylonitrile/polyvinylidene fluoride alloy hollow fiber membrane and its preparation, to achieve the effects of good toughness, improved performance and high strength

Inactive Publication Date: 2010-09-22
苏州膜华材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the strength, toughness and other defects of the membrane made of polyacrylonitrile single polymer material in the current technology, and provides a new type of polyacrylonitrile / polyvinylidene fluoride alloy hollow fiber membrane, so that it can be used in terms of mechanical strength and the like. The performance of the membrane is improved, which greatly improves the separation performance of the membrane

Method used

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  • Polyacrylonitrile/polyvinylidene fluoride alloy hollow fiber membrane and preparation method thereof
  • Polyacrylonitrile/polyvinylidene fluoride alloy hollow fiber membrane and preparation method thereof
  • Polyacrylonitrile/polyvinylidene fluoride alloy hollow fiber membrane and preparation method thereof

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Embodiment 2

[0070] Polyacrylonitrile (molecular weight 30,000) 162 grams, polyvinylidene fluoride (molecular weight 50,000) 18 grams, Tween 100 grams, heptadecafluorodecyltrimethoxysilane 5 grams, dimethylacetamide 715 grams in 60 ℃ stirring for 12 hours, defoaming for 12 hours, to prepare spinning dope. The spinning solution at 30°C is under 0.2MPa nitrogen pressure, and the inner gel medium (25°C reverse osmosis water) passes through the circular two-hole concentric spinneret at the same time, and the as-spun fibers are ejected through the 8cm air gap and enter the 25°C external coagulation bath Hollow fiber membrane filaments are formed in reverse osmosis water. The hollow fiber membrane passes through the godet wheel to the winding wheel. After 1 hour, it was cut off, washed in reverse osmosis water for two days, and stored in 25 wt.% glycerin solution. Gained hollow fiber membrane outer diameter is 1.3mm, and inner diameter is 0.6mm, and tensile strength is 1.5MPa, and elongation i...

Embodiment 3

[0072] Polyacrylonitrile (molecular weight 30,000) 162 grams, polyvinylidene fluoride (molecular weight 50,000) 18 grams, Tween 200 grams, heptadecafluorodecyltrimethoxysilane 10 grams, dimethylacetamide 600 grams in 60 ℃ stirring for 12 hours, defoaming for 12 hours, to prepare spinning dope. The spinning solution at 30°C is under 0.2MPa nitrogen pressure, and the inner gel medium (25°C reverse osmosis water) passes through the circular two-hole concentric spinneret at the same time, and the as-spun fibers are ejected through the 8cm air gap and enter the 25°C external coagulation bath Hollow fiber membrane filaments are formed in reverse osmosis water. The hollow fiber membrane passes through the godet wheel to the winding wheel. After 1 hour, it was cut off, washed in reverse osmosis water for two days, and stored in 25 wt.% glycerin solution. Gained hollow fiber membrane outer diameter is 1.3mm, and inner diameter is 0.6mm, and tensile strength is 1.4MPa, and elongation ...

Embodiment 4

[0074] 162 grams of polyacrylonitrile (30,000 molecular weight), 18 grams of polyvinylidene fluoride (50,000 molecular weight), 380 grams of isopropanol, 15 grams of perfluorooctyltrimethoxysilane, and 340 grams of dimethylacetamide in 60 ℃ stirring for 12 hours, defoaming for 12 hours, to prepare spinning dope. The spinning solution at 30°C is under 0.2MPa nitrogen pressure, and the inner gel medium (90wt.% dimethylacetamide solution at 25°C) passes through the circular two-hole concentric spinneret at the same time, and the as-spun fibers are ejected through the 8cm air gap. Enter the 25 ℃ external coagulation bath reverse osmosis water to form hollow fiber membrane filaments. The hollow fiber membrane passes through the godet wheel to the winding wheel. After 1 hour, it was cut off, washed in reverse osmosis water for two days, and stored in 25 wt.% glycerin solution. Gained hollow fiber membrane outer diameter is 1.3mm, and inner diameter is 0.6mm, and tensile strength i...

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Abstract

The invention relates to a hollow fiber membrane and a preparation method thereof. The formula of casting solution comprises the following components in percentage by mass: 16 to 20 percent of polyacrylonitrile, 1 to 4 percent of polyvinylidene fluoride, 40 to 79 percent of solvent, 0.5 to 38 percent of first additive and 0.5 to 2 percent of second additive, wherein the solvent is at least one ofdimethyl formamide, dimethyl acetamide and N-methyl pyrrolidone; the first additive is at least one of Tween, isopropanol and ethylene glycol; and the second additive is at least one of (heptadecafluoro-1,1,2,2-tetradecyl)trimethoxysilane and perfluorooctyltrimethoxysilane. The performance of a polyacrylonitrile / polyvinylidene fluoride alloy membrane produced by adopting the method is improved toa great extent compared with that of a pure polyacrylonitrile membrane, so that membrane application field is expanded greatly.

Description

technical field [0001] The invention relates to a polyacrylonitrile / polyvinylidene fluoride alloy hollow fiber membrane and a preparation method thereof. Background technique [0002] With the intensification of environmental pollution and the depletion of water resources, people have higher and higher requirements for water recycling and advanced treatment. Membrane separation technology, as a new type of separation technology, has great technical advantages in the fields of drinking water, industrial and agricultural water purification, sterilization and water quality assurance, industrial wastewater and domestic sewage treatment and regeneration, etc. Compared with traditional methods High efficiency, energy saving and environmental protection. Therefore, in the future, membrane separation technology will be an important new technology to solve major problems such as resources, energy, and environment faced by human beings, especially in the field of water treatment. Wi...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D69/08
Inventor 洪耀良奚韶锋潘福生
Owner 苏州膜华材料科技有限公司