Preparation method for homogeneously-enhanced polyvinylidene fluoride hollow fiber membrane

A polyvinylidene fluoride, homogenous reinforcement technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of poor interface bonding strength, rupture of membrane filaments, and impact on effluent water quality, etc., to improve mechanical properties, interface Good bonding strength and improved hydrophilicity

Active Publication Date: 2012-07-25
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned heterogeneously reinforced hollow fiber membranes all have the problem of poor interface bonding strength. In actual use, the membrane filaments are prone to rupture or the coating layer and the reinforcement layer are peeled off from each other, and the effluent water quality is greatly affected, which is seriously restricted. Improve the service life of the membrane product

Method used

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  • Preparation method for homogeneously-enhanced polyvinylidene fluoride hollow fiber membrane
  • Preparation method for homogeneously-enhanced polyvinylidene fluoride hollow fiber membrane
  • Preparation method for homogeneously-enhanced polyvinylidene fluoride hollow fiber membrane

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[0029] According to the preparation method of the homogeneously reinforced membrane of the present invention, a homogeneously reinforced polyvinylidene fluoride hollow fiber membrane can be prepared. The homogeneous reinforced membrane has the characteristics of both melt-spinning and solution-spinning membranes, can significantly improve the hydrophilicity of the PVDF membrane, and at the same time improve the mechanical properties of the membrane.

[0030] What is not mentioned in the present invention is applicable to the prior art.

Embodiment 1

[0033] Preparation of base membrane: polyvinylidene fluoride hollow fiber membrane was prepared by melt spinning method, and it was used as reinforcement base membrane; the maximum pore size was 1.4 μm.

[0034] Prepare casting solution: mix 14% PVDF with 10% polyvinylpyrrolidone k30, dissolve in 76% dimethylacetamide solvent, stir at 70°C until completely dissolved, Degassing in a vacuum oven at 70°C to obtain a clear casting solution.

[0035] Preparation of homogeneous mold: First, the polyvinylidene fluoride casting solution is evenly coated on the surface of the reinforcement base film through the spinning spinneret, and then the coated base film is pulled by the godet roller at a speed of 10cm / min, spun into a film, and then immersed in an ultrafiltration water coagulation bath at room temperature through a 15cm long air gap. After 24 hours, it was solidified and formed into a homogeneous reinforced film.

[0036] Performance test: The pure water flux of the obtain...

Embodiment 2

[0038]Preparation of base membrane: polyvinylidene fluoride hollow fiber membrane was prepared by melt spinning method, and it was used as reinforcement base membrane; the maximum pore size was 2.2 μm.

[0039] Preparation of casting solution: mix 18% PVDF with 8% pore-forming agent (7% PEG 600; 3% Tween-80), dissolve in 74 % dimethylacetamide solvent, stirred at 70°C until completely dissolved, and degassed in a vacuum oven at 70°C to obtain a clear casting solution.

[0040] Preparation of homogeneous mold: First, the polyvinylidene fluoride casting solution is evenly coated on the surface of the reinforcement base film through the spinning spinneret, and then the coated base film is pulled by the godet roller at a speed of 25cm / min, spun into a film, and then immersed in an ultrafiltration water coagulation bath at 40°C through a 5cm long air gap. After 24 hours, it was solidified and formed into a homogeneous reinforced film.

[0041] Performance test: The pure water flu...

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Abstract

The invention discloses a preparation method for a homogeneously-enhanced polyvinylidene fluoride hollow fiber membrane. The preparation method comprises the following process steps of: firstly, preparing a reinforced body base membrane and taking a polyvinylidene fluoride hollow fiber membrane as the reinforced body base membrane; secondly, preparing a polyvinylidene fluoride membrane casting solution comprising the following components in percentage by mass: 6-20 percent of polyvinylidene fluoride, 0.6-2 percent of hydrophilic polymer or hydrophilic inorganic particle, 6-10 percent of pore-forming agent and 68-87.4 percent of solvent; mixing various components in a water bath of 70-90 DEG C, stirring the components for 3-4 hours and dissolving; and vacuum defoaming to obtain the membrane casting solution; and thirdly, preparing a homogeneously-enhanced membrane; uniformly coating the membrane casting solution to the surface of the reinforced body base membrane through a spinneret for spinning; then spinning the reinforced body base membrane to form a membrane under the traction of a silk guide roller; and solidifying the membrane with ultrafiltration water through an air gap with the length being 5-20cm to obtain the homogeneously-enhanced membrane, wherein the traction speed is 5-25cm / min.

Description

technical field [0001] The invention relates to a hollow fiber membrane preparation technology, in particular to a preparation method of a homogeneously reinforced polyvinylidene fluoride hollow fiber membrane. Background technique [0002] In the modern society that advocates green environmental protection and sustainable development, the combination of membrane technology and traditional activated sludge treatment technology to form membrane bioreactor (MBR) technology is the key technology to realize the utilization of sewage resources, and it is the most promising technology in the 21st century. One of the promising high-tech. [0003] Polyvinylidene fluoride (PVDF) has strong anti-pollution ability, good mechanical properties, excellent anti-ultraviolet and weathering resistance, strong chemical stability (not easy to be corroded by acids, alkalis, strong oxidants and halogens, etc., and resistant to many common organic compounds. Solvent) and other characteristics hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/34
CPCB01D2325/40B01D69/08B01D71/34B01D67/0013B01D67/0016B01D69/02B01D69/10B01D69/088B01D69/12B01D63/02B01D63/021B01D67/002B01D2323/00
Inventor 肖长发张旭良胡晓宇安树林
Owner TIANJIN POLYTECHNIC UNIV
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