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Preparation method of nanocellulose composite polysulfone hollow fiber membrane

A technology of nano-cellulose and fiber membranes, applied in the field of separation membranes, can solve problems such as inability to achieve reinforcement, low mechanical strength, and poor interface compatibility, and achieve improved interface compatibility, improved mechanical properties, and improved hydrophilicity Effect

Inactive Publication Date: 2016-06-15
QINYUAN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, it is worth noting that at present, nanocellulose is mostly used for composite reinforcement of hydrophilic bulk materials, but less for hydrophobic bulk materials.
The reason is that the direct use of hydrophilic nanocellulose and hydrophobic polymer body materials has the problem of poor interfacial compatibility.
Therefore, nanocellulose is easy to agglomerate in the polymer body material, and the purpose of uniform dispersion and compounding cannot be achieved, resulting in defects in the structure of the composite material, low mechanical strength, and the purpose of reinforcement cannot be achieved

Method used

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Examples

Experimental program
Comparison scheme
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preparation example Construction

[0019] The embodiment of the invention discloses a method for preparing a nanocellulose composite polysulfone hollow fiber membrane, which includes the following steps: simultaneously extruding the casting liquid and the core liquid through the annular spinning head of the submerged precipitation phase inversion spinning device, Form a tubular liquid film, and the casting solution includes polysulfone, nanocellulose, polyethylene glycol and sulfonated polysulfone with a mass ratio of 13-30:0.1-7:1-8:0.5-5; The liquid membrane is solidified in a coagulation bath after passing through the air gap, soaked in water for cleaning, and obtains a polysulfone hollow fiber membrane composited with nanocellulose.

[0020] The invention adopts the method of immersion precipitation phase inversion to prepare the hollow fiber membrane, uses nanocellulose as the strengthening agent and hydrophilic modifier of the polysulfone membrane, and uses polyethylene glycol as the dispersant of the nano...

Embodiment 1

[0035] Uniformly disperse nanocellulose with a length of 80nm in dimethylacetamide, add polysulfone, polyethylene glycol and sulfonated polysulfone, stir and dissolve to form a uniform solution, let stand for defoaming, and obtain polysulfone and nanocellulose , Polyethylene glycol (molecular weight: 20,000) and sulfonated polysulfone casting solution with a mass ratio of 14:7:1:2; a mixed solution of dimethylacetamide and water with a volume ratio of 1:3 as the core fluid . The casting liquid and the core liquid are simultaneously extruded through the annular spinning head of the submerged precipitation phase inversion spinning device to form a tubular liquid film. The flow rate of the casting liquid is 20g / min, the flow rate of the core liquid is 20ml / min, and the tubular liquid film passes through After entering the coagulation bath of water for 24 hours to solidify into a hollow fiber membrane with an air gap of 7 cm, after soaking and washing in water for 48 hours, a poly...

Embodiment 2

[0038] Uniformly disperse nanocellulose with a length of 200nm in dimethylacetamide, add polysulfone, polyethylene glycol and sulfonated polysulfone, stir and dissolve into a uniform solution, let it stand for defoaming, and obtain polysulfone and nanocellulose , Polyethylene glycol (molecular weight 4000) and sulfonated polysulfone casting solution with a mass ratio of 20:2:5:5; a mixed solution of dimethylacetamide and water with a volume ratio of 1:4 as the core solution . The casting liquid and the core liquid are simultaneously extruded through the annular spinning head of the submerged precipitation phase inversion spinning device to form a tubular liquid film. The flow rate of the casting liquid is 10g / min, the flow rate of the core liquid is 10ml / min, and the tubular liquid film passes through After an air gap of 15 cm, enter the coagulation bath of water to solidify for 24 hours to form a hollow fiber membrane, and after soaking and washing in water for 48 hours, a po...

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Abstract

The invention provides a preparation method of a nanocellulose composite polysulfone hollow fiber membrane. The preparation method comprises the steps that a membrane casting solution and a core solution are extruded through an annular spinning head of an immersion precipitated phase inversion spinning device at the same time to form a tubular liquid membrane, wherein the membrane casting solution comprises polysulfone, nanocellulose, polyethylene glycol and sulfonated polysulfone; the tubular liquid membrane passes through an air gap to enter a coagulating bath to be solidified, the tubular liquid membrane is placed in water to be soaked and cleaned, and the nanocellulose composite polysulfone hollow fiber membrane is obtained. The nanocellulose is used as a reinforcing agent and a hydrophilic modifying agent, and the mechanical strength and hydrophilism of the polysulfone membrane are improved; the polyethylene glycol is used as a dispersing agent for the nanocellulose and a hydrophilic modifying agent for the polysulfone membrane, the compatibility between the nanocellulose and polysulfone and the hydrophilism of the polysulfone membrane are improved, and therefore the prepared nanocellulose composite polysulfone hollow fiber membrane has the advantages of being high in strength and good in hydrophilism. In addition, the preparation method is simple in technology.

Description

technical field [0001] The invention relates to the technical field of separation membranes, in particular to a preparation method of a nanocellulose composite polysulfone hollow fiber membrane. Background technique [0002] Polysulfone membrane has excellent thermal stability and chemical stability, and is widely used in fields such as hemodialysis, seawater desalination and water treatment. The composition of the casting solution system and the film-forming conditions are important factors that determine the structure and performance of the polysulfone membrane. Therefore, by adjusting the concentration and composition of the casting solution, the composition of the coagulation bath, the temperature, the air gap and the flow rate, etc., different physical structures can be prepared. and performance polysulfone membranes. However, polysulfone is a highly hydrophobic polymer material, so the hydrophilicity of the polysulfone membrane is poor, which leads to the fact that wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/10B01D67/00B01D69/08B01D69/12
CPCB01D71/68B01D67/0011B01D67/0016B01D69/08B01D69/12B01D71/10B01D2325/36B01D2325/40
Inventor 胡梦欣叶建荣沈立强计根良
Owner QINYUAN GRP CO LTD
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