Positively charged polyvinyl chloride hollow fiber nanofiltration membrane and preparation method thereof

A polyvinyl chloride, positively charged technology, applied in the field of membrane separation, can solve the problems of high cost of raw materials, and achieve the effects of strong anti-pollution, low requirements for influent pretreatment, and strong capacity of storage

Active Publication Date: 2011-10-12
HAINAN LITREE PURIFYING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hollow fiber nanofiltration membranes reported above are superior to flat membranes in terms of anti-pollution and component loading, the preparation process still uses multiple steps, and the cost of raw materials is still relatively high.

Method used

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  • Positively charged polyvinyl chloride hollow fiber nanofiltration membrane and preparation method thereof
  • Positively charged polyvinyl chloride hollow fiber nanofiltration membrane and preparation method thereof
  • Positively charged polyvinyl chloride hollow fiber nanofiltration membrane and preparation method thereof

Examples

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preparation example Construction

[0032] The steps of the preparation method of the positively charged polyvinyl chloride hollow fiber nanofiltration membrane are as follows:

[0033] 1) 20-30% by weight of polyvinyl chloride, 3.33-20% by weight of cationic copolymer, 1-5% by weight of pore size regulator, and 0.1-1% by weight of heat stabilizer Mix with a solvent with a weight percentage of 54-75%, stir and dissolve at 50-70°C to form a film-making solution with a uniform positively charged dense skin layer; the pore size regulator is polyvinylpyrrolidone, polyethylene glycol or Glycerol, the number average molecular weight of polyvinylpyrrolidone is 1×10 3 -1×10 4 , The number average molecular weight of polyethylene glycol is 1×10 2 -1×10 3 ;

[0034] 2) Combine 15-25% by weight of polyvinyl chloride, 1-5% by weight of pore size regulator, 0-2% by weight of inorganic filler, 0.1-1% by weight of heat stabilizer and Mixing 67-84% solvent by weight, stirring and dissolving at 50-70°C to form a membrane-ma...

Embodiment 1

[0043] 1) Mix 330g polyvinyl chloride (PVC), 200g allyltriphenylphosphine chloride-vinyl chloride copolymer, 35g polyethylene glycol, 2g tributyltin chloride and 1000g N,N'-dimethyl Acetamide (DMAc) was mixed, stirred and dissolved at 70°C for 24 hours to form a film-making solution (cortex) with a uniform positively charged dense skin layer;

[0044] 2) Mix 250g of polyvinyl chloride, 40g of polyethylene glycol, 5g of silicon nitride, 2g of tributyltin chloride and 1000g of N,N'-dimethylacetamide (DMAc), stir and dissolve at 70°C to form Membrane-making solution (support layer) for uniform charge-neutral porous support layer;

[0045] 3) Pass the core liquid at 60°C through the central tube of a spinneret with a double-layer structure, and the film-making liquid with a positively charged dense skin layer at 70°C pass through the inner ring of a spinneret with a double-layer structure at 70°C. The film-forming solution of the electrically neutral porous support layer passes t...

Embodiment 2

[0056]1) Mix 450g polyvinyl chloride (PVC), 48.3g trimethylallylammonium chloride-vinyl chloride copolymer, 14.9g polyethylene glycol, 1.5g tributyltin chloride and 1000g N,N'- Dimethylformamide (DMF) was mixed, stirred and dissolved at 50°C for 24 hours to form a film-making solution (skin layer) with a uniform positively charged dense skin layer;

[0057] 2) Mix 330g of polyvinyl chloride, 67g of polyethylene glycol, 0g of silicon nitride, 2g of tributyltin chloride and 1000g of DMF, stir and dissolve at 50°C to form a uniform film-making solution for the electrically neutral porous support layer (support layer);

[0058] 3) Pass the core liquid at 30°C through the central tube of a spinneret with a double-layer structure, and the film-making liquid with a positively charged dense skin at 50°C pass through the outer ring of a spinneret with a double-layer structure at 50°C. The film-making liquid of the electrically neutral porous support layer passes through the inner ring...

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Abstract

The invention discloses a method for preparing a positively charged polyvinyl chloride (PVC) hollow fiber nanofiltration membrane. The positively charged PVC hollow fiber nanofiltration membrane has a two-layer structure consisting of a positively charged compact skin layer and an electrically neutral porous support layer; the pore diameter of micropores of the compact skin layer is 1-5nm, and the pore diameter of micropores of the porous support layer is 10-100nm; and the outer diameter of the membrane is 1.5-3.0mm, and the inner diameter of the membrane is 0.5-2mm, wherein the positively charged compact skin layer comprises main components of polyvinyl chloride and cationic copolymer; and the electrically neutral porous support layer comprises main components of polyvinyl chloride and an inorganic filler. The method for preparing the positively charged PVC hollow fiber nanofiltration membrane comprises the following steps of: co-extruding positively charged compact skin layer membrane preparing liquid and electrically neutral porous support layer membrane preparing liquid in a two-layer ring shape; and curing and forming hollow fibers by using a dry-wet spinning process. The prepared hollow fiber nanofiltration membrane has the advantages of easily controlled interception property, high strength, simple preparation process and the like, and is a high-performance, low-cost and long-life nanofiltration membrane material for water treatment.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a preparation method of a positively charged polyvinyl chloride hollow fiber nanofiltration membrane. Background technique [0002] Due to the advantages of high efficiency, simple equipment, convenient operation, energy saving and environmental protection, membrane separation technology has shown great application potential in the industrial field, and its application range has been extended to biology, medicine, environmental protection, energy, seawater desalination, wastewater treatment, etc. field. Nanofiltration (NF) is a membrane separation technology between reverse osmosis (RO) and ultrafiltration (UF). The solute interception performance of nanofiltration membrane is between that of reverse osmosis membrane and ultrafiltration membrane. The nanofiltration membrane is a pressure-driven membrane, which can efficiently remove divalent ions and sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/10B01D71/30B01D67/00
Inventor 王纳川朱宝库肖玲陈良刚陈清赵斌
Owner HAINAN LITREE PURIFYING TECH CO LTD
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