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

A fiber membrane, three-component technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the adverse effects of subsequent unit operations of hollow fiber membranes, hollow fiber membranes have not yet been seen, and mechanical properties are not ideal, etc. problems, to achieve the effect of convenient source of raw materials, excellent mechanical properties and enhanced strength

Inactive Publication Date: 2010-07-14
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 a

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Mix polyvinylidene fluoride, polymethyl methacrylate and polyvinyl chloride in a mass ratio of 60:30:10, add solvent N, N-dimethylacetamide and additive polyvinylpyrrolidone PVP and blend and stir for 24 Hours to dissolve, the dissolution temperature is 60 ~ 90 ℃;

[0025] (2) Aluminum oxide Al 2 o 3 The nanoparticles and the solvent N, N-dimethylacetamide were oscillated in an ultrasonic oscillator for 2 hours, mixed with the solution prepared in step (1), stirred evenly, and allowed to stand for 24 hours for defoaming to obtain a casting solution;

[0026] In the casting solution, the mass fraction of polymer is 10%, the mass fraction of polyvinylpyrrolidone is 10%; the mass fraction of aluminum oxide is 10%, and the rest is solvent N, N-dimethylacetamide;

[0027] (3) adopt dry-wet spinning process to carry out spinning, and technological condition is: dry spinning length is 3~15cm, and spinning pressure is 1atm, and core liquid is the N of 10~40wt%, N-dimethyl...

Embodiment 2

[0030] (1) Mix polyvinylidene fluoride, polymethyl methacrylate and polyvinyl chloride in a mass ratio of 80:10:10, add solvent N,N-dimethylacetamide and additive polyvinylpyrrolidone PVP and blend and stir for 24 Hours to dissolve, the dissolution temperature is 60 ~ 90 ℃;

[0031] (2) Aluminum oxide Al 2 o 3 The nanoparticles and the solvent N, N-dimethylacetamide were oscillated in an ultrasonic oscillator for 2 hours, mixed with the solution prepared in step (1), stirred evenly, and allowed to stand for 24 hours for defoaming to obtain a casting solution;

[0032] In the casting solution, the mass fraction of polymer is 25%, the mass fraction of polyvinylpyrrolidone is 1%; the mass percentage of aluminum oxide is 1%, and the rest is solvent N, N-dimethylacetamide;

[0033](3) adopt dry-wet spinning process to carry out spinning, and technological condition is: dry spinning length is 3~15cm, and spinning pressure is 1atm, and core liquid is the N of 5~40wt%, the N of N-di...

Embodiment 3

[0036] (1) Mix polyvinylidene fluoride, polymethyl methacrylate and polyvinyl chloride in a mass ratio of 60:10:30, add solvent N,N-dimethylacetamide and additive polyvinylpyrrolidone PVP and blend and stir for 24 Hours to dissolve, the dissolution temperature is 60 ~ 90 ℃;

[0037] (2) Aluminum oxide Al 2 o 3 The nanoparticles and the solvent N, N-dimethylacetamide were oscillated in an ultrasonic oscillator for 2 hours, mixed with the solution prepared in step (1), stirred evenly, and allowed to stand for 24 hours for defoaming to obtain a casting solution;

[0038] In the casting solution, the mass fraction of polymer is 15%, the mass fraction of polyvinylpyrrolidone is 5%; the mass percentage of aluminum oxide is 5%, and the rest is solvent N, N-dimethylacetamide;

[0039] (3) adopt dry-wet spinning process to carry out spinning, and technological condition is: dry spinning length is 3~15cm, and spinning pressure is 1atm, and core liquid is the N of 10~40wt%, N-dimethyla...

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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 ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00B01D69/08B01D71/02
Inventor 奚旦立李运清陈季华马春燕王军管荣辉
Owner DONGHUA UNIV
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