Composite hollow fiber film preparation method based on on-line braiding-phase transfer moulding

Abstract

A composite hollow fiber film preparation method based on an on-line braiding-phase transfer moulding. The method comprises the following steps: a high-molecular organic membrane material is used as a composite layer material, and the high-molecular organic membrane material, a solvent and an additive are mixed according to a mass ratio, stirred and dissolved uniformly to be prepared into a composite layer casting solution of a composite hollow fiber membrane; textile fabrics are braided into a supporting layer of a fiber braiding pipe through on-line braiding of a braiding machine; supporting layer of a fiber braiding pipe is braided along a core by traction of a traction device of a pultrusion machine and with the core being fixed, and enters into a die through a front end of the core; meanwhile, the composite layer casting solution is dipped in a composite layer casting solution dipping zone in a front end of the die (the composite layer casting solution is injected into a die cavity gradually under pressure), and dragged to a coagulating tank for gelatinization and solidification; and the composite hollow fiber film is obtained. The invention has technical effects that the preparation process is simple; the braiding pipe is braided through the on-line braiding machine, and separating membrane is combined on the braiding pipe synchronized; the braiding pipe and the composite layer have many contact points and are combined tightly; besides, preparation conditions of the tubular composite hollow fiber film to produce a durable composite hollow fiber film with high performance and high strength, at low costs.

Description

Technical field [0001] The invention relates to a preparation method of an online weaving-phase transfer molding composite hollow fiber membrane, in particular to a preparation technology of a high-strength hollow fiber membrane. Background technique [0002] Membrane technology is an emerging separation technology developed in the 1960s. Because of its many advantages, it has received wide attention and has been well applied. In the entire membrane technology system, membrane has become a key part as the core unit. Hollow fiber membranes have become the main membrane form of microfiltration and ultrafiltration processes due to their excellent self-supporting properties, high packing density, and relatively large processing area per unit volume. In the actual use process, long-term high-pressure water flow compression, impact disturbance, and frequent cleaning, high-speed water flow and even airflow will cause great damage to the membrane filaments. Broken filaments have become a...

AI Technical Summary

Problems solved by technology

However, the membrane strength of the organic membrane is not high, and the membrane material is often broken, especially the hollow fiber membrane is prone to membrane filament breakage

The hollow fiber membrane prepared by the general method, the membrane strength is completely provided by the separation membrane material itself, the practicability of the separation membrane is not only related to the separation function, but also closely related to the membrane strength, especially the properties of some membrane materials (such as polyvinylidene fluoride) ) also makes the strength of hollow fiber preparation low, difficult to meet the requirements