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Preparation method of heterogeneous enhanced polyvinylidene fluoride hollow fiber membrane with high bursting strength

A polyvinylidene fluoride film-making technology, applied in the field of preparation of heterogeneously reinforced polyvinylidene fluoride hollow fiber membranes, can solve the problems of poor compatibility of inorganic/organic materials, uneven coating, and large performance differences and other issues to achieve the effect of improving compatibility, simple process and low cost

Active Publication Date: 2012-11-21
NINGBO SHUIYI FILM TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese invention patent application CN200910115557.9 discloses that a heterogeneously reinforced composite membrane is prepared by dipping an inorganic braided tube into an organic casting solution. Poor, easy to cause uneven coating, poor adhesion and other shortcomings

Method used

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  • Preparation method of heterogeneous enhanced polyvinylidene fluoride hollow fiber membrane with high bursting strength

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dip a polyester fiber hollow braided tube with an inner diameter of 1.0 mm and an outer diameter of 1.6 mm in a mixed solution of 5% (mass concentration) of sodium hydroxide and 0.5% (mass concentration) of fatty alcohol polyoxyethylene ether AEO-7 , treated at 50°C for 30 minutes, washed with deionized water, and dried at 80°C; under the condition of nitrogen protection, polyvinylidene fluoride (PVDF) with a number average molecular weight of 200,000 was dissolved in N , N-dimethylacetamide (DMAC) prepared a dilute polyvinylidene fluoride solution with a mass concentration of 0.1%, soaked the polyester fiber hollow braided tube in the dilute polyvinylidene fluoride solution for 4 hours, and then took out the After being centrifuged at 3000 rpm for 5 minutes at a high speed, it was dried at 80° C. to obtain a pre-coated modified hollow braided tube.

[0031] Polyvinylidene fluoride (PVDF), polyvinylpyrrolidone PVP-K17, and N,N-dimethylacetamide (DMAC) were prepared in a...

Embodiment 2

[0033]A polyester fiber hollow braided tube with an inner diameter of 1.2 mm and an outer diameter of 1.8 mm is immersed in a mixed solution of 10% (mass concentration) sodium hydroxide and 1% (mass concentration) fatty alcohol polyoxyethylene ether AEO-7, Treat at 60°C for 20 minutes, wash with deionized water, and dry at 80°C; under nitrogen protection, dissolve polyvinylidene fluoride (PVDF) with a number average molecular weight of 100,000 in N, N-dimethylacetamide (DMAC) prepared a dilute polyvinylidene fluoride solution with a mass concentration of 0.5%, put the hollow braided polyester fiber tube in the dilute polyvinylidene fluoride solution and soaked it for 6 hours, then took it out and passed through 5000rpm After high-speed centrifugation for 10 minutes, dry at 80° C. to obtain a pre-coated modified hollow braided tube.

[0034] Polyvinylidene fluoride (PVDF), polyvinylpyrrolidone PVP-K17, N,N-dimethylacetamide (DMAC) according to the mass ratio of 25:15:60 to prep...

Embodiment 3

[0036] A hollow braided polyester fiber tube with an inner diameter of 1.4 mm and an outer diameter of 2.0 mm is immersed in a mixed solution of 20% (mass concentration) sodium hydroxide and 2% (mass concentration) fatty alcohol polyoxyethylene ether AEO-9, and the Treat at 70°C for 20 minutes, wash with deionized water, and dry at 60°C; under nitrogen protection, dissolve polyvinylidene fluoride (PVDF) with a number average molecular weight of 300,000 in N,N -Dimethylacetamide (DMAC) prepares a dilute solution of polyvinylidene fluoride with a mass concentration of 1%, puts the hollow braided polyester fiber tube in the dilute solution of polyvinylidene fluoride and soaks it for 8 hours, then takes it out and passes through a high-speed process of 8000rpm After being centrifuged for 30 minutes, it was dried at a temperature of 60° C. to obtain a pre-coated modified hollow braided tube.

[0037] Polyvinylidene fluoride (PVDF), polyvinylpyrrolidone PVP-K30, and N,N-dimethylacet...

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Abstract

The invention discloses a preparation method of heterogeneous enhanced polyvinylidene fluoride hollow fiber membrane with high bursting strength, wherein a hollow weaved pipe is used as a supporting material, a pre-coating modulated hollow weaved pipe is prepared by the steps of pre-treatment by using alkali and surfactant solution, pre-coating by using polyvinylidene fluoride solution, high-speed centrifugal separation and drying, and then the heterogeneous enhanced polyvinylidene fluoride hollow fiber membrane with high bursting strength is prepared by evenly coating polyvinylidene fluoride membrane forming solution on the surface of the hollow weaved pipe. The preparation method has simple process and low cost, and enables the heterogeneous enhanced polyvinylidene fluoride hollow fiber membrane to have the advantages of high bursting strength, high pass and high tensile strength and to be greatly improved in the shearing resistance and shock resistance.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a method for preparing a heterogeneously reinforced polyvinylidene fluoride hollow fiber membrane with high burst strength. Background technique [0002] Membrane separation technology originated in the 1960s. After decades of rapid development, its application fields have penetrated into all aspects of people's life and production, such as chemical industry, electronics, textiles, petroleum, food, medicine, etc., known as " The Third Industrial Revolution". Hollow fiber membrane is the most commonly used type of membrane separation material. Among the current membrane materials, hollow fiber membrane is famous for its excellent self-supporting performance, high packing density and relatively large treatment area per unit volume. Become the main membrane form of microfiltration and ultrafiltration. [0003] In recent years, the membrane bioreactor (MBR) has been widely used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/08B01D69/10B01D69/02
Inventor 叶建荣黄小军沈立强万灵书徐志康
Owner NINGBO SHUIYI FILM TECH DEV CO LTD
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