Preparation method of blended kynoar polyvinylidene fluoride hollow fabulous membrane for blood filtration

A polyvinylidene fluoride, hemofiltration technology, applied in the fields of blood filtration, membrane technology, semi-permeable membrane separation, etc., can solve problems such as affecting the stability and practical performance of the membrane, reducing the porosity and average pore size, and poor permeability. , to achieve the effect of improving hydrophilic performance and dimensional stability, reducing shrinkage and long service life

Active Publication Date: 2009-12-09
浙江海富海洋生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the low surface energy and high crystallinity of PVDF, its permeability is very poor; and during the filtration process, PVDF membrane is very sensitive to the adsorption of proteins, and it is easy to block the membrane pores, which leads to high pollution of the membrane.
At the same time, the polyvinylidene fluoride membrane will produce a lot of shrinkage during the drying process, which will reduce the porosity and average pore size and affect the stability and practical performance of the membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Dosing according to the following components and compositions: 18% polyvinylidene fluoride; 2% phenolphthalein polyarylether sulfone; 5% polyvinylpyrrolidone (K60); 75% dimethylacetamide, all of which are in mass percentage. Put the above raw materials into the dissolver, under the temperature control of 40-100°C, they are swollen and dissolved to make spinning dope.

[0025] (2) After the above-mentioned spinning dope is filtered and defoamed, it is extruded from a spinneret consisting of two concentric tubes; it enters dimethylacetamide (DMAc) with a concentration of 3% by mass and a temperature of 20°C. , Solidification in a solution with a solution circulation rate of 20L / h. After more than four bidirectional (axial and radial) stretching and moderate retraction of the as-spun silk, four washings, and 50% (mass percentage concentration) ethanol solution treatment, the hollow fiber is obtained by winding at a speed of 10m / min. .

[0026] The obtained hollow fib...

Embodiment 2

[0028] (1) Dosing according to the following components and compositions: polyvinylidene fluoride 18%; phenolphthalein polyarylether sulfone 1%; polyvinylpyrrolidone 14%; N-methylpyrrolidone 67%, the above are mass percentages. Put the above raw materials into the dissolver, under the temperature control of 40-100°C, they are swollen and dissolved to make spinning dope.

[0029] (2) After the above-mentioned spinning dope is filtered and degassed, it is extruded from a spinneret consisting of two concentric tubes; the N-methylpyrrolidone mass percentage concentration is 10%, the temperature is 20°C, and the solution is circulated. Coagulate in a solution with a volume of 20L / h. After more than four bidirectional (axial and radial) stretching and moderate retraction of the as-spun silk, four washings, and 50% (mass percent concentration) ethylene glycol solution treatment, winding at a speed of 10m / min yielded hollow fiber.

[0030] The obtained hollow fiber membrane has a th...

Embodiment 3

[0032] (1) Dosing according to the following components and compositions: polyvinylidene fluoride 15%; phenolphthalein polyarylether sulfone 3%; polyethylene glycol 20005%; dimethyl sulfoxide 77%, all of which are in mass percent. Put the above raw materials into the dissolver, under the temperature control of 40-100°C, they are swollen and dissolved to make spinning dope.

[0033] (2) After the above-mentioned spinning stock solution is filtered and degassed, it is extruded from a spinneret composed of two concentric tubes; the concentration of dimethyl sulfoxide is 5%, the temperature is 20°C, and the solution is circulated. Coagulate in a solution with a volume of 20L / h. After more than four bidirectional (axial and radial) stretching and moderate retraction of the as-spun silk, four washings, and 50% (mass percentage concentration) isopropanol solution treatment, winding at a speed of 10m / min yielded hollow fiber.

[0034] The obtained hollow fiber membrane has a thickne...

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Abstract

The invention relates to a preparation method of blended kynoar polyvinylidene fluoride hollow fabulous membrane for blood filtration, comprising steps of (1) taking kynoar polyvinylidene fluoride, phenolphthalein aryl ether sulfone, neutral polymeric adsorbent powder, pore former and solvent, and stirring; (2) filtering and de-foaming spinning dope, extruding from a spinneret composed of two cocentric tubes; after 20 to 800mm dry spinning process, solidifying, primarily generating filaments, after bi-directionally drawing and retracting for over four times, water washing and treating with hole retaining agent, winding at speed of 10 to 60m/min, thus obtaining the hollow fabulous membrane. The method is simple and is applied to industrial production. The obtained hollow fabulous membrane has advantages of low shrinkage and high flux, is applied to directly clear endogenous and exogenous toxicant in human body, has good clearing effect to toxicant having middle and low molecular mass in blood and is applied to blood filtration.

Description

technical field [0001] The invention belongs to the field of preparation of blended polyvinylidene fluoride hollow fiber membranes, in particular to the preparation of blended polyvinylidene fluoride hollow fiber membranes for blood filtration. Background technique [0002] As a new type of fluorocarbon thermoplastic, polyvinylidene fluoride has a crystalline melting point of about 180°C and a thermal decomposition temperature above 360°C. Polyvinylidene fluoride has excellent mechanical properties, and has a series of advantages such as good impact strength, good toughness, high hardness, good wear resistance, and creep resistance. At the same time, it also has outstanding anti-ultraviolet and weathering resistance characteristics, and has good chemical stability. Because it has the above-mentioned many advantages, and it is easy to cast to form a film with good porosity, it is very popular. It is a new type of high-efficiency separation membrane among special fiber separa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08A61M1/34
Inventor 何春菊孙俊芬王庆瑞
Owner 浙江海富海洋生物科技有限公司
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