Reinforced composite supported hollow fiber membrane and preparation method thereof

Abstract

The invention relates to a reinforced composite supported hollow fiber membrane and a preparation method thereof. The reinforced composite supported hollow fiber membrane comprises a weaving support tube, a transition layer and a separating layer, wherein the support tube is a hollow braided fabric; the adhesive strength between the weaving support tube and the transition layer is 0.4-4N; the weaving support tube is made of synthetic fiber through weaving. The reinforced composite supported hollow fiber membrane and the preparation method thereof have the beneficial effects that as the support tube is subjected to corona treatment, the surface of the support tube is relatively rough, and the specific surface area of the support tube is improved, so that the adhesive strength between the transition layer and the support tube of the hollow fiber membrane is improved; due to adoption of a macromolecule polymer added in the transition layer, the adhesive strength between the support layer and the separating layer is improved, and the hollow fiber membrane is effectively prevented from being stripped in the use process. The preparation method comprises the following step that the weaving tube passes through a corona machine, a pre-coating machine head, a coating machine head and a coagulating bath respectively in a horizontal manner. The preparation method is simple to operate, the process condition is easy to control and production efficiency is high.

Description

technical field [0001] The invention relates to the field of hollow fiber composite ultrafiltration membranes, in particular to a reinforced composite support hollow fiber membrane and a preparation method thereof. Background technique [0002] Due to the increase in the degree of industrialization, the water quality of domestic water sources continues to deteriorate, and the requirements for the reuse rate of industrial wastewater continue to increase. Good chemical stability, high mechanical strength and strong anti-pollution ability have become more and more common requirements for the quality of membrane separation materials. MBR is one of the most promising wastewater treatment technologies. Since the first MBR demonstration project was completed in 1990, MBR has expanded from flat to hollow fiber and multi-channel appearance. Membrane separation materials include PE, PP, PES and PVDF. At present, most of the membrane filaments used in the market are single-structure ...

AI Technical Summary

Problems solved by technology

[0003] Patents CN101254420A and CN1711128A disclose a method for preparing a reinforced tubular porous body composite membrane. In this method, two layers of polymer solution are coated on the hollow fiber fabric. However, in this composite hollow fiber, due to the low density of the braided support tube, The strength of the braided support tube is not enough, because the low density of the braided support tube leads to weak bonding between the braided support tube and the coating layer. During the use of the membrane filament, due to repeated aeration and washing, the polymer is very Easily peels off from braided support tube

[0004] Patent 102160967A discloses a liner-reinforced hollow fiber membrane tube and its preparation device and preparation method. In this preparation method, the braided support tube has not been processed, and the adhesion is limited. At the same time, it enters the coagulation bath vertically. Before the fiber membrane is completely solidified, it may need to pass through a deep distance, which will lead to a larger depth of the coagulation bath, which will cause inconvenient operation during the production process and reduce production efficiency

[0005] Patent CN101406810A discloses a method for preparing reinforced composite hollow fibers by thermally induced phase separation. In this method, the polymer needs to be heated to above 140°C. The defect is that too high a temperature may cause softening or plastic deformation of the support tube, resulting in the The stability of spinning film yarn can not be guaranteed

[0006] Patent CN102284251A discloses a manufacturing method of polytetrafluoroethylene hollow fiber membrane, which is supported by a PET braided support tube, coated with an adhesive, wrapped with a PTFE screen protector on the braided support tube, and then baked. Dry, this kind of membrane has good strength and toughness, but due to the use of PTFE material, Teflon flat membrane is not easy to prepare, the winding process is more complicated, and industrialization is very difficult

[0007] Patent CN102240509A discloses a preparation method of on-line weaving-phase transfer molding composite hollow fiber membrane. The hollow fiber membrane prepared by this method has limited adhesive force due to only the coating layer and the support layer, which may cause peeling during application. , at the same time, because the online weaving and coating solidification are connected together, due to the limitation of the speed of the braiding support tube, the coating speed is also very low. During the weaving process, when the bobbin needs to be changed, the spinning will stop production, which is difficult Realize industrialization

[0008] Patent CN102205208A discloses a device for preparing fiber-reinforced hollow fiber membranes. This device conducts a coagulation bath vertically. Because the braided support tube should not touch the godet wheel before the coating layer is solidified, this method has low production efficiency. The problem

Images