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Preparation method of enhanced polyacrylonitrile hollow fiber membrane

A technology of polyacrylonitrile fibers and polyacrylonitrile, which is applied in the field of preparation of reinforced polyacrylonitrile hollow fiber membranes, which can solve the problem of unsatisfactory improvement of the bonding strength between the separation layer and the transition layer, the limitation of the interface bonding strength, and the impact on the use of the membrane Life and other issues, achieve good interface bonding state, improve service life, and high interface bonding strength

Inactive Publication Date: 2012-07-18
TIANJIN POLYTECHNIC UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method has the problem of interlayer compatibility. The transition layer will form a smooth interface after being gelled, and the bonding strength between the separation layer and the transition layer cannot be improved satisfactorily.
[0007] The problem with the above-mentioned technical solution is that the reinforcement materials used are polyester, nylon, polyamide, etc., which are different from the surface separation layer materials polyvinylidene fluoride and polyacrylonitrile, and there are differences in compatibility. A series of improved methods, but the way of heterogeneous reinforcement makes the interface bonding strength inevitably limited, so that the surface separation layer is easy to peel off from the surface of the reinforcement during high-intensity shaking and backwashing, which seriously affects the service life of the membrane

Method used

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  • Preparation method of enhanced polyacrylonitrile hollow fiber membrane
  • Preparation method of enhanced polyacrylonitrile hollow fiber membrane
  • Preparation method of enhanced polyacrylonitrile hollow fiber membrane

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preparation example Construction

[0022] The preparation method (abbreviation preparation method) of the enhanced polyacrylonitrile hollow fiber membrane (abbreviation hollow membrane) of the present invention's design, adopts following processing steps:

[0023] (1). Braided polyacrylonitrile fiber reinforcement; use two-dimensional weaving technology to weave polyacrylonitrile fiber into polyacrylonitrile fiber hollow braided tube (referred to as hollow braided tube), and use the hollow braided tube as the reinforcement of hollow fiber membrane Body; Described polyacrylonitrile fiber is conventional polyacrylonitrile continuous fiber (filament) or polyacrylonitrile staple fiber yarn;

[0024] (2). Prepare polyacrylonitrile casting solution; said polyacrylonitrile casting solution (casting solution for short) is prepared by mixing and dissolving polyacrylonitrile resin and additives in a solvent, and its mass fraction consists of:

[0025] Polyacrylonitrile resin 3-25%;

[0026] Solvent 50-95%;

[0027] Add...

Embodiment 1

[0042] (1) The polyacrylonitrile fiber filaments are braided into a polyacrylonitrile fiber hollow braided tube by two-dimensional weaving technology, and the breaking strength is 540.4N.

[0043] (2) polyacrylonitrile resin accounting for 11% of the total mass of the system, dimethyl sulfoxide accounting for 80% of the total mass of the system, polyvinylpyrrolidone accounting for 7% of the total mass of the system and Tween- 80 blended, dissolved evenly, and defoamed to obtain polyacrylonitrile casting solution.

[0044] (3) The hollow braided tube obtained in step (1) is infiltrated with ethanol, and the infiltration time is 1 s.

[0045] (4) According to the skin / core composite spinning process, the polyacrylonitrile fiber hollow braided tube obtained in step (3) is used as a reinforcement, and co-extruded with the polyacrylonitrile casting solution obtained in step (2) through an annular spinneret The casting liquid is evenly coated on the surface of the polyacrylonitrile...

Embodiment 2

[0048] (1) The polyacrylonitrile fiber filaments are braided into a polyacrylonitrile fiber hollow braided tube by two-dimensional weaving technology, and the breaking strength is 540.4N.

[0049] (2) polyacrylonitrile resin accounting for 12% of the total mass of the system, N,N-dimethylformamide accounting for 79% of the total mass of the system, polyvinylpyrrolidone accounting for 8% of the total mass of the system and 1% of the total mass of the system Tween-80 is blended, dissolved evenly, and defoamed to obtain polyacrylonitrile casting solution.

[0050] (3) The hollow braided tube obtained in step (1) is infiltrated with ethanol, and the infiltration time is 60 s.

[0051] (4) According to the skin / core composite spinning process, the polyacrylonitrile fiber hollow braided tube obtained in step (3) is used as a reinforcement, and co-extruded with the polyacrylonitrile casting solution obtained in step (2) through an annular spinneret The casting solution is evenly coa...

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Abstract

The invention discloses a preparation method of an enhanced polyacrylonitrile hollow fiber membrane. The preparation method comprises the following steps of: (1) knitting a polyacrylonitrile fiber reinforcement body: knitting a polyacrylonitrile fiber hollow knitted tube by a two-dimensional knitting technology, wherein the polyacrylonitrile fiber hollow knitted tube is used as a reinforcement body of the hollow fiber membrane; (2) preparing polyacrylonitrile membrane casting liquid, wherein the polyacrylonitrile membrane casting liquid consists of the following components in percentage by mass: 3-25% of polyacrylonitrile resin, 50-95% of solvent and 2-30% of additive; (3) performing surface pretreatment of the reinforcement body: wetting the hollow knitted tube with low-polarity organic liquid for 1-60 seconds, wherein the low-polarity organic liquid is ethanol, glycerol, isopropyl alcohol or polyethylene glycol-600; and (4) preparing a hollow fiber membrane: co-extruding the hollow knitted tube and the membrane casting liquid through an annular spinning nozzle, and performing sufficient solidification in a coagulating bath to obtain the enhanced polyacrylonitrile hollow fiber membrane.

Description

technical field [0001] The invention belongs to the technical field of membrane preparation, in particular to a method for preparing a reinforced polyacrylonitrile hollow fiber membrane. Background technique [0002] Polyacrylonitrile has organic solvent resistance, light resistance, weather resistance, mold resistance, good chemical stability, thermal stability and solution spinning film processing performance, etc., and polyacrylonitrile has a wide range of sources and is cheap. An ideal membrane material. [0003] As the application range of hollow fiber membranes becomes wider and wider, the requirements for their performance are also higher and higher. Traditional single-material hollow fiber membrane materials (such as poor mechanical properties of solution spinning membranes, etc.) can no longer fully adapt to membrane separation. The needs of technology application development. Heterogeneously reinforced polyvinylidene fluoride hollow fiber membrane (using polyeste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D69/08B01D67/00
CPCB01D71/42B01D2325/40B01D69/088B01D67/0011B01D69/087B01D69/10B01D71/421
Inventor 肖长发王瑞刘美甜安树林
Owner TIANJIN POLYTECHNIC UNIV
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