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Preparation method of homogeneous enhanced cellulose acetate hollow fiber membrane

A technology of cellulose acetate and homogeneous reinforcement, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of environmental secondary pollution, poor biocompatibility, and difficult natural degradation, etc., and achieve high peeling Strength, high breaking strength, and easy recycling

Inactive Publication Date: 2014-08-27
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But as far as the applicant knows, the current homogeneously reinforced hollow fiber membrane materials only have polyacrylonitrile, polyvinylidene fluoride and polyvinyl chloride (the latter two use a homogeneous base membrane by melt extrusion as a reinforcement), and its bio Poor compatibility, it is not easy to degrade naturally after being discarded, and it is easy to cause secondary pollution to the environment

Method used

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  • Preparation method of homogeneous enhanced cellulose acetate hollow fiber membrane
  • Preparation method of homogeneous enhanced cellulose acetate hollow fiber membrane
  • Preparation method of homogeneous enhanced cellulose acetate hollow fiber membrane

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preparation example Construction

[0017] A homogeneous reinforced cellulose acetate hollow fiber membrane designed by the present invention (referred to as hollow membrane, see figure 1 , 2 ) Preparation method (referred to as preparation method), the preparation method adopts the following process steps:

[0018] (1) Preparation of hollow braided tube reinforcement: using two-dimensional weaving technology to weave cellulose acetate filaments into a hollow braided tube with a diameter of 1-2mm, and use the hollow braided tube as a hollow fiber membrane reinforcement; The two-dimensional weaving technique described is a well-known technique itself.

[0019] (2) Preparation of casting film: The casting film is obtained by mixing cellulose acetate, pore former and non-solvent in a solvent at 60-90°C, stirring for 3-5 hours and dissolving. The quality score is composed of:

[0020]

[0021] Wherein, the acetyl content of the cellulose acetate is 38-41.5% and the molecular weight is 30,000-50,000; the pore-forming agent...

Embodiment 1

[0027] (1) Using a 16-spindle two-dimensional braiding machine, weave the 450D / 90F diacetate filament into a hollow braided tube with a diameter of 1.5mm;

[0028] (2) Mix 8% of the total mass of the system with cellulose acetate (39.8% acetyl content and 30000 molecular weight), 5% of the total mass of the system polyethylene glycol 10000, and 2% of the total mass of the system with water. It is dissolved in N,N-dimethylacetamide which accounts for 85% of the total mass of the system and stirred at 70°C for 4 hours to obtain a cellulose acetate casting solution;

[0029] (3) Using godet roll traction coating technology, the cellulose acetate casting film obtained in step (2) is uniformly coated on the surface of the hollow braided tube obtained in step (1) through a co-extrusion spinneret at 60°C , At a traction speed of 40m / h, after passing through an air gap of 10cm, it is immersed in water at 20°C to solidify to form a homogeneous reinforced cellulose acetate hollow fiber membr...

Embodiment 2

[0032] (1) Using a 16-spindle two-dimensional braiding machine, weave the 450D / 90F diacetate filament into a hollow braided tube with a diameter of 1.5mm;

[0033] (2) Cellulose acetate (with an acetyl content of 38% and a molecular weight of 40,000) accounting for 9% of the total mass of the system, polyvinylpyrrolidone K15 accounting for 4% of the total mass of the system, and Tween-80 accounting for 2% of the total mass of the system Mix with dimethyl sulfoxide accounting for 85% of the total mass of the system, and stir at 70°C for 4 hours to dissolve to obtain a cellulose acetate casting solution;

[0034] (3) Using godet roller traction coating technology, the cellulose acetate casting film obtained in step (2) is uniformly coated on the surface of the hollow braided tube obtained in step (1) through a co-extrusion spinneret at 70°C At a traction speed of 60m / h, after passing through an air gap of 20cm, it is immersed in water at 25°C to solidify and form a homogeneous reinfo...

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Abstract

The invention discloses a preparation method of a homogeneous enhanced cellulose acetate hollow fiber membrane, and the preparation method comprises the following process steps: 1, preparation of a hollow braided tube reinforced body, to be more specific, using a 2D woven technology to prepare a cellulose acetate filament into a hollow braided tube with the diameter of 1-2mm, and using the hollow braided tube as the reinforced body; 2, preparation of a cellulose acetate membrane casting solution comprising 4-18% by mass of cellulose acetate, 2-20% by mass of a pore forming agent, 0-4% by mass of a non solvent and 58-94% by mass of a solvent; 3, preparation of the hollow fiber membrane, to be more specific, homogeneously coating the surface of the hollow braided tube with the membrane casting solution by use of a co-extrusion spinneret, then using a silk guide roller for leading to pass through the air gap of 2-20cm to immerse into a solidification bath at 10-50 DEG C for forming to obtain the hollow fiber membrane; the hollow fiber membrane has good mechanical properties and interfacial bonding state, is easy to process after being abandoned, and has the advantages of simple preparation method.

Description

Technical field [0001] The invention belongs to the technical field of membrane preparation, and is specifically a method for preparing a homogeneous reinforced cellulose acetate hollow fiber membrane. Background technique [0002] Cellulose acetate (CA) is a common membrane material that has long been used in ultrafiltration (UF) membranes, reverse osmosis (RO) and nanofiltration (NF) membranes. Compared with other materials, cellulose acetate has a wide range of sources, low prices, certain biocompatibility, relatively stable physical and chemical properties, and good chlorine resistance and oxidation resistance. [0003] At present, there are two main methods for preparing cellulose acetate hollow fiber membranes: (1). Solution phase inversion method. Patent US5403485A discloses a method for preparing cellulose acetate hollow fiber membrane for dialysis. The method uses acetic acid as a solvent to dissolve cellulose acetate to make a spinning solution. Nitrogen is introduced t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/16B01D67/00
Inventor 肖长发凡祖伟刘海亮黄庆林
Owner TIANJIN POLYTECHNIC UNIV
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