Preparation method for reinforced polyvinylidene fluoride hollow fiber membrane

Abstract

The invention discloses a preparation method for a reinforced polyvinylidene fluoride hollow fiber membrane. The preparation method comprises the following steps of preparing a casting solution, preparing a hollow braided rope, preparing a reinforcing body, preparing a primary hollow fiber membrane body, preparing a reinforced body base membrane body and preparing the hollow fiber membrane. The method has the advantages of being simple in process and high in efficiency, meanwhile, the prepared membrane has excellent corrosion resistance, heat resistance, cold resistance, oxidation resistance and weather resistance, pollutants can be selectively blocked, irreversible deposition of the pollutants on the surface of the membrane can be prevented or reduced, and the anti-pollution performance of the membrane is improved; and the problem that the skin layer is prone to fall off in the using process of a hollow fiber membrane can be solved, a polyacrylonitrile filament which has the co-solvent characteristic with a polyvinylidene fluoride surface separation layer is adopted and is woven into hollow tubular fabric to serve as the reinforced body of the membrane, the casting solution has agood wettability on the reinforcing body and partially permeates into fiber gaps of the reinforcing body, the mechanical bonding strength is improved, the possibility of filament breaking and pollutant blockage can be lowered, and the service life of the membrane is prolonged.

Description

technical field [0001] The invention relates to the technical field of hollow fiber membrane manufacturing, in particular to a method for preparing a reinforced polyvinylidene fluoride hollow fiber membrane. Background technique [0002] With the rapid growth of social economy, the increasing shortage of water resources has become an important factor restricting economic and social development. Membrane separation and purification technology has great advantages and potential in water treatment and other environmental protection fields because of its advantages such as high separation efficiency, simple equipment, convenient operation, high degree of automation, and no secondary pollution. Polymer organic membrane plays an important role in the field of membrane separation, and its production process is simple, and the variety of membrane materials is relatively diverse. The use of polyvinylidene fluoride hollow fiber membranes involves a wide range of applications and can ...

AI Technical Summary

Problems solved by technology

In the process of use, it has to repeatedly withstand the impact and disturbance of large flow water flow and air flow, which is very prone to fracture and damage, which affects the treatment effect and also brings adverse effects on subsequent unit operations.

Corrosion resistance, heat resistance, cold resistance, oxidation resistance, and weather resistance of existing ultrafiltration membranes, separation membranes, and hollow fiber membranes need to be improved

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