Application of hollow fiber braided tube, hollow fiber desalination membrane and preparation method thereof

Abstract

The invention provides uses of a hollow fiber braiding pipe, and a hollow fiber desalination film and a preparation method thereof, particularly a hollow fiber braiding pipe reinforcing type desalination film obtained by using the hollow fiber braiding pipe. The preparation method comprises: (1) adopting a hollow fiber braiding pipe as a base lining, carrying out high temperature singeing treatment, removing disordered fibers from the braiding pipe surface, and preparing a hollow fiber ultra-filtration film by coating a polymer on the surface; and (2) forming an ultra-thin desalination layer (interface polymerization function layer) on the surface of the hollow fiber ultra-filtration film by using an interface polymerization method through a polyamine aqueous solution and a polyacyl chloride organic solution. According to the present invention, the obtained hollow fiber desalination film is a low-defect film, wherein the utilization rate of the film can be effectively improved, the additional economic cost caused by the film defect can be reduced, a certain positive role is provided in the film preparation and the film application promotion, and the film fiber generates the self-compacting during the use process due to the influence of the high operation pressure, and it is ensured that no defect is generated during the running process.

Description

technical field [0001] The invention relates to the technical field of membrane separation, especially the use of hollow fiber braided tubes, hollow fiber desalination membranes and a preparation method thereof. Background technique [0002] Membrane separation technology, as a new high-efficiency separation technology, has been widely used in chemical industry, environmental protection, electronics, light industry, textile, energy engineering and other fields. Foreign experts even call the development of membrane separation technology "the third industry". revolution". [0003] With the increasingly serious problem of water resources, the status of seawater desalination and wastewater treatment is becoming more and more prominent, so the application of desalination membrane is becoming more and more extensive. Membrane technology is separation and purification at the ionic level. In order to achieve ion-level separation, in addition to the narrow range of membrane pore siz...

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Problems solved by technology

[0005] Non-woven fabrics are made by spraying oriented or random fibers. There are a large number of non-oriented fibers on the surface of non-woven fabrics. Due to tension and other reasons, uneven coating or even no coating of the ultrafiltration membrane-forming system will be formed around the non-oriented fibers, and defects will be formed in the subsequent preparation of the interface functional layer; The mesh support layer is made into a roll-type membrane module, and under the influence of high operating pressure, the mesh inside the module is easy to sink into the desalination membrane, resulting in the formation of defects in the desalination membrane and the overall desalination rate of the desalination membrane decreases

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