Lining-reinforced hollow fiber membrane tube as well as preparation device and preparation method thereof

Abstract

The invention relates to a lining-reinforced hollow fiber membrane tube as well as a preparation device and preparation method thereof, belonging to the field of preparation of polymer hollow fiber microporous membranes. In the membrane tube, a film forming chimney is designed reasonably, a coating layer on a braided tube led from a coating machine is subjected to controllable steam diffusion-induced phase inversion firstly, and then enters a coagulating bath, so that an open-pore surface skin layer with high porosity is formed on a film separation layer, and the radial direction of the membrane layer is in an integral asymmetric and interpenetrating cell-shaped structure; a composite material is selected to prepare a transition layer, so that the transition layer has excellent adhesive force and hardness, excellent compatibility with a surface separation layer and tiny cubical contraction in a phase conversion process at the same time; optimized braided tube size and braiding densityare selected to ensure that the braided tube has lower flexibility; and a method capable of maintaining reasonable roundness and the like in the production process ensures that the lining polyvinylidene fluoride (PVDF) hollow ultrafiltration membrane tube has the advantages of integral asymmetric structure with high integrity, high-porosity surface separation layer, higher back pressure enduring capability and the like.

Description

technical field

[0001] The invention belongs to the field of polymer hollow fiber microporous membrane preparation, and relates to a liner-reinforced hollow fiber membrane tube, a preparation device and a preparation method thereof. Background technique

[0002] With the continuous improvement of the degree of industrialization and the deteriorating quality of various water sources, good chemical stability, high mechanical strength, and strong anti-pollution ability have become more and more common requirements for the performance of membrane separation materials. At the same time, due to the water quality-type water shortage caused by the deep pollution of a large number of water bodies, the MBR process has become the most promising wastewater treatment technology in the market. Since the first MBR demonstration project was completed in 1990, the special membrane elements for MBR process have expanded from flat to hollow or multi-channel. At present, the hollow membrane el...

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