Three-component five-hole hollow fibrous membrane and preparation method thereof

Abstract

The invention relates to a three-component five-hole hollow fibrous membrane, which comprises the following components: 60-80wt% of polyvinylidene fluoride, 10-30wt% of polymethylmethacrylate and 10-30wt% of polrvinyl chloride; and the section of the membrane is provided with five holes. The membrane is divided into five layers from the outside to the inside, which are sequentially a cortical layer, a sub finger-shaped hole supporting layer, a thumb-shaped hole supporting layer, a sub finger-shaped hole supporting layer and an endodermis layer and is in a bidirectional asymmetrical structure. The preparation method comprises the steps of adding solvent and PVP for dissolution after mixing the materials in a certain proportion, oscillating Al2O3 nanoparticles and the solvent via ultrasound for 2 hours, evenly stirring the solution, standing still for 24h for deaeration, and then making the membrane through spinning with a dry-wet spinning process. The five-hole membrane has the advantages of large water flux, high rejection rate, excellent mechanical properties and the like, the preparation process is simple, the energy consumption and the operation cost are low, raw materials are obtained conveniently and are environmentally friendly, and the method is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of hollow fiber membranes and a preparation method thereof, in particular to a three-component five-hole hollow fiber membrane and a preparation method thereof. Background technique [0002] In the past 30 years, membrane separation technology has been widely used as a new type of high separation, concentration, purification and purification technology. It has become an important high-tech solution to contemporary energy, resource and environmental pollution problems and the basis for sustainable development. From the perspective of technological development, membrane technology will enter a period of comprehensive development in the 21st century, and will become one of the top ten new high technologies and one of the six new technologies that will dominate the future industry in the 21st century. [0003] Polyvinylidene fluoride (PVDF) is an excellent membrane material, but its extremely strong hydrophobicity limits ...

AI Technical Summary

Problems solved by technology

[0004] Hollow fiber membrane is an important form of membrane, which has the advantages of high packing density, large specific surface area and simple module structure, but it still has many shortcomings such as small water flux, low rejection rate and unsatisfactory mechanical properties, especially It is the unsatisfactory mechanical properties that affect its wide application in production, because in the production process, the membrane will be repeatedly impacted by high-pressure water flow, and it will also be subjected to the impact and disturbance of large-flow water flow and air flow during the cleaning process of the membrane. Membranes such as mesoporous membranes are prone to fracture and damage, which not only reduces the treatment effect in the production process, but also increases production costs. At the same time, as an important pretreatment method in the water treatment process, the fracture and damage of the hollow fiber membrane will also cause damage to subsequent unit operations. Negative Effects

[0005] However, most of the previous research is to blend PVDF with PVC or PMMA in pairs, and only one mesoporous membrane is prepared. There are still many shortcomings, and so far, no hollow membrane with a five-pore structure has been seen. Related literature reports on fiber membranes

Images