Yarn fiber reinforced double-layer tubular filtering membrane and method for preparing same

Abstract

The invention discloses a yarn fiber reinforced double-layer tubular filtering membrane. The tubular filtering membrane has a double-layer structure, wherein the inner layer is a first polymer membrane, while the outer layer is a second polymer membrane; and yarn fibers distributed in parallel are arranged in the inner layer or the outer layer for mechanically reinforcing the tubular filtering membrane. The tubular filtering membrane provided by the invention is obviously improved in transverse compression resistance and blast resistance as well as membrane safety while having excellent axial mechanical properties; and the tubular filtering membrane with excellent overall performance for external-compression type filtering or internal-compression type filtering by adjusting the distribution positions of the yarn fibers and the double-layer structure and the properties of the membrane. The invention also discloses a method for preparing the tubular filtering membrane; and the two-layer synchronous coextrusion technique is employed, so that the production efficiency of the membrane can be effectively improved and the preparation cost of the tubular filtering membrane can be reduced.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a double-layered yarn fiber reinforced tubular filter membrane and a preparation method thereof. Background technique [0002] Membrane separation process is a new type of high-efficiency separation technology that uses selective permeable membrane as the separation medium, and is driven by external force to separate, purify and concentrate the mixture. The tubular filter membrane is widely used in water treatment, biomedicine, food chemical industry and other fields because of its large effective separation area, simple component structure, and easy operation. However, compared with inorganic membranes such as ceramics and metals, the mechanical strength of polymer tubular filter membranes is relatively poor, and problems such as broken wires, flattening, and rupture are prone to occur during use and cleaning. In order to improve the mechanical properties of tubul...

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Problems solved by technology

However, the tubular membrane reinforced with braided tube often has the following problems: the bonding performance between the braided tube and the polymer film is poor, and there is detachment and peeling during use; the braided tube reinforced tubular membrane prepared by conventional methods, Generally only suitable for external pressure filtration; affected by the efficiency and cost of existing fiber weaving, the cost of the tubular membrane is relatively high

However, because the fiber-reinforced membrane is only axially distributed in the membrane, the tensile properties of the membrane are only axially improved, and the compression and blast resistance properties are not significantly improved; at the same time, the fibers and membrane fluid are inevitably There is a certain bonding problem, and there are certain safety hazards in the long-term use of the membrane filament

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