Spinning head and method for preparing braided tube/polymer composite membrane by using spinning head

Abstract

The invention discloses a spinning head and a method for preparing a braided tube / polymer composite membrane by using the spinning head. The spinning head comprises a shell and a cover plate, wherein the cover plate is arranged at the top part of the shell; the cover plate is provided with a fiber braided tube inlet, a pressurizing hole and a film casting liquid inlet; the fiber braided tube inlet is connected with an internal catheter extending to the bottom part of the shell; the bottom part of the shell is provided with a film casting liquid outlet; the film casting liquid outlet is connected with a spinning jet; the shell is of a double-layer cask-shaped structure; an inner layer cask forms a film casting liquid cavity; a cavity between an outer layer cask and the inner layer cask forms a circulating bath heating cavity; and side walls of the outer layer cask are respectively provided with a circulating bath inlet and a circulating bath outlet. According to the spinning head disclosed by the invention, through the centralized positioning and pre-coating action of the internal catheter and a braided tube channel on the spinning jet on the braided tube, the evenness of a polymer coating on the surface of the braided tube is effectively improved, and a binding force between the braided tube and the coating is enhanced. Moreover, the discharge rate of film casting liquid is controlled through nitrogen pressurization, and thus, the coating uniformity can be further ensured. The prepared braided tube / polymer composite membrane is higher in mechanical strength and burst pressure.

Description

Technical field [0001] The invention relates to a spinning device for preparing a separation membrane and a preparation method thereof, in particular to a spinning head for preparing a braided tube / polymer composite membrane and the use of the spinning head to prepare a braided tube / polymer composite Membrane method. technical background [0002] At present, in the preparation process of polymer / braided tube composite membrane, the structure of the spinning head used is very complicated, and the time of contact between the braided tube and the casting liquid is too long, and the braided tube is prone to occur under the pressure of the casting liquid. Deformation, so that the coating of the casting liquid on the surface of the braided tube is not uniform; in addition, due to the pressure fluctuations of the casting liquid squeezed into the spinning head, the amount of co-extrusion of the braided tube with the casting liquid may change. The thickness uniformity of the polymer coat...

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Problems solved by technology

[0002] At present, in the preparation process of polymer / braided tube composite membrane, the structure of the spinning head used is very complicated, and the contact time between the braided tube and the casting solution is too long, and the braided tube is prone to breakout under the pressure of the casting solution. deformation, so that the coating of the casting solution on the surface of the braided tube is uneven; in addition, due to the pressure fluctuation of the casting solution squeezed into the spinning head, the co-extrusion amount of the braided tube carrying the casting solution may change, and the obtained The thickness uniformity of the polymer coating on the composite membrane varies, which ultimately affects the structural properties of the resulting membrane

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