Method and device for producing enhanced hollow fiber membrane

Abstract

The invention discloses a method for producing an enhanced hollow fiber membrane, which comprises (a) braiding a fiber rope to serve as an inner support for the hollow fiber membrane; (b) dragging the fiber rope to pass through a membrane casting solution while allowing the fiber rope to fully immerse in the membrane casting solution; (c) allowing the fiber rope to pass through an eyelet after leaving the membrane casting solution, and arranging a spherical body, with diameter larger than the diameter of the eyelet, in the tubular section of the fiber rope, and allowing the spherical body to abut against the eyelet by use of collection tension; (d) allowing the fiber rope to pass through a water tank after leaving the eyelet and solidify in the liquid, and sending the fiber rope out when the membrane casting solution on the surface of the fiber rope loses flowability; and (e) collecting. The invention also provides a device for producing the enhanced hollow fiber membrane by adopting the method. The invention can solve the problem of clogging of membrane filament due to material seepage in case of material solution with low viscosity, to ensure uniform penetration of the material solution into the inner and outer walls and improve the bonding force between the membrane layer and the support layer, and can solve the problem of non-round appearance.

Description

technical field [0001] The invention belongs to the field of hollow fiber membranes. Specifically, the invention relates to a production method of a reinforced hollow fiber membrane with internal support and a supporting production device suitable for the method. Background technique [0002] At present, the problem of membrane treatment of sewage has been more and more applied in China. Membrane treatment of sewage has advantages that cannot be compared with traditional processes, such as fast treatment speed and high treatment precision. There are also various membranes for sewage treatment. The existing membranes are divided into flat membranes, roll membranes, hollow fiber membranes, etc. according to their shapes. The forming methods are divided into dry method, wet method, and thermal phase method. [0003] The present invention is a molding method for reinforced hollow fiber membranes, which is obtained on the basis of wet methods. Most of the existing wet membrane fo...

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Problems solved by technology

[0006] At present, it is impossible to use low-viscosity casting solution, that is, casting solution with low solid content, for spinning when spinning the inner support membrane. Because the core solution cannot pass through the inside of the membrane filament when spinning the reinforced hollow fiber membrane supported by the inner support at present, so the membrane The filament can only gel from the outside to the inside. When the viscosity of the casting solution is low, it is easy to seepage or the inner diameter of the membrane filament is blocked.

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