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Polyvinylidene fluoride hollow fiber microporous membrane and preparation method thereof

A polyvinylidene fluoride and microporous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as increasing the difficulty of process implementation and production cycle, complex extraction and separation processes, and imperfect technology. , to achieve the effect of simple method, uniform pore size distribution and large water flux

Active Publication Date: 2012-07-18
三泰(青岛)膜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermally induced phase separation method in the prior art still has the shortcomings of imperfect technology and difficult industrialization. How to improve the technology to complete the industrialization has become a hot research topic at present.
[0005] The Chinese patent with the publication number CN101569837A discloses a method for preparing a polyvinylidene fluoride microporous membrane, which uses a high-temperature solvent and a non-solvent to form a composite diluent by mixing a certain proportion to prepare a polyvinylidene fluoride microporous membrane, which increases The difficulty of implementing the process and the production cycle, and the subsequent extraction and separation process is relatively complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 30 grams of polyvinylidene fluoride with a weight average molecular weight of 700,000, 50 grams of diacetin, 50 grams of triacetin, and 10 grams of polyethylene glycol 6000 are thoroughly stirred in a pressure vessel at 160°C to obtain a homogeneous casting solution. The pressure range of the pressure vessel is -0.1Mpa~1MPa; the film casting liquid is uniformly cooled through a 1.5-meter-long pipe, and the temperature is lowered to 140℃ for 4 seconds, and then the inner gel medium polyethylene glycol 600 passes through the spinneret to flow outside The outer gel medium is injected under the protection of the protective liquid. The inner gel medium has a concentration of 100% and the temperature is 100°C. The outer gel medium is polyethylene glycol 200 with a concentration of 20% and the temperature is 45°C. The outer protective liquid is Polyethylene glycol 200 with a concentration of 20% and a temperature of 65°C; the prepared membrane is immersed in the extract for 3 ho...

Embodiment 2

[0035] Using the casting solution formula of Example 1, the casting solution is uniformly cooled through a 1.5-meter-long pipe for 5 seconds, and the temperature is reduced to 130°C, and then the inner gel medium polyethylene glycol 600 passes through the spinneret to protect the outside of the flow The outer gel medium is injected under the protection of the liquid, the inner gel medium concentration is 30%, the temperature is 90℃, the outer gel medium is polyethylene glycol 200, its concentration is 30%, the temperature is 35℃, and the outer protective liquid is poly Ethylene glycol 200, the concentration of which is 30%, the temperature is 55°C; the prepared membrane is immersed in the extract for 3 hours, where the extract is ethanol with a concentration of 45%. Vinylidene fluoride hollow fiber microporous membrane.

[0036] According to the conventional membrane performance test method, the average pore diameter measured by mercury intrusion method is 0.11μm, the porosity is...

Embodiment 3

[0038] Using the casting solution formula of Example 1, the casting solution is uniformly cooled through a 1-meter-long pipe for 2 seconds, and the temperature is lowered to 145°C, and then the inner gel medium polyethylene glycol 600 passes through the spinneret to protect the outside of the flow Inject the outer gel medium under the protection of the liquid, the inner gel medium concentration is 40%, the temperature is 110℃, the outer gel medium is polyethylene glycol 200, its concentration is 40%, the temperature is 55℃, and the outer protective liquid is poly Ethylene glycol 200 with a concentration of 40% and a temperature of 85°C; the prepared membrane is immersed in the extract for 3 hours, where the extract is ethanol with a concentration of 95%. After the membrane filaments are taken out and air-dried, the polymer is obtained. Vinylidene fluoride hollow fiber microporous membrane.

[0039] According to the conventional membrane performance test method, the average pore d...

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PUM

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Abstract

The invention discloses a polyvinylidene fluoride hollow fiber microporous membrane and a preparation method thereof. The polyvinylidene fluoride hollow fiber microporous membrane comprises the following components in percentage by weight: 20-45% of polyvinylidene fluoride, 50-79.4% of thinner and 0.6-17% of additive. The preparation method of the hollow fiber microporous membrane is realized on the basis of a thermotropic phase separation process. The polyvinylidene fluoride hollow fiber microporous membrane has the characteristics of high strength, uniform pore diameter distribution, high porosity and the like, and has high inoxidizability, the pore diameter is generally between 0.1-0.5mu m, and the porosity is 60-85%, so the hollow fiber microporous membrane has large water flux, is not easy to block in use, can be widely used for feed water treatment, and is particularly suitable for the membrane bioreactor technology and other water treatment fields.

Description

Technical field [0001] The invention relates to a hollow fiber microporous membrane and a preparation method thereof, and more specifically, to a polyvinylidene fluoride hollow fiber microporous membrane and a preparation method thereof. Background technique [0002] In recent years, microporous membrane technology has been successfully used in the treatment of various waste waters, especially the membrane bioreactor technology (Membrane Bioreactor, referred to as MBR) that combines microporous membrane and biological aeration technology. Small size, energy saving, and high sludge utilization rate, so it has become a noticeable advanced technology at home and abroad, especially in groundwater treatment, food industry wastewater treatment, electronic industry wastewater treatment, chemical industry wastewater treatment, and animal husbandry wastewater treatment. application. In water treatment, especially MBR applications, the microporous membrane is required not only to have a h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/08C02F3/00
Inventor 李方鲲王效宁
Owner 三泰(青岛)膜科技有限公司
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