Preparation method of porous polyvinylidene fluoride alloy membrane for treating and recycling waste water

A polyvinylidene fluoride and wastewater treatment technology, which is applied in chemical instruments and methods, osmotic/dialysis water/sewage treatment, membrane technology, etc. Easy operation and management, uniform hole distribution effect

Inactive Publication Date: 2009-08-19
苏州膜华材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the above-mentioned hydrophilic modification methods, the first two methods have complex processes, are not easy to implement, and have high processing costs

Method used

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  • Preparation method of porous polyvinylidene fluoride alloy membrane for treating and recycling waste water
  • Preparation method of porous polyvinylidene fluoride alloy membrane for treating and recycling waste water
  • Preparation method of porous polyvinylidene fluoride alloy membrane for treating and recycling waste water

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preparation example Construction

[0019] The preparation method of the porous polyvinylidene fluoride alloy membrane for wastewater treatment and reuse proposed by the present invention comprises the following steps:

[0020] (1) Preparation of blend raw materials:

[0021] polyvinylidene fluoride P 1 with polymethyl methacrylate P 2 , diluent or latent solvent S, and additive A are weighed in proportion, placed in a melt mixer successively, melted and mixed at a temperature of 160-200°C, and cooled and granulated in air to obtain the raw material of the blend ,

[0022] where P 1 is polyvinylidene fluoride, P 2 For polymethyl methacrylate, the mass ratio and mass percentage of weighing are: P 2 / P 1 =0—0.25, (P 1 +P 2 ) / (P 1 +P 2 +S)=(25—55)wt%, A / (P 1 +P 2 )=0—0.20;

[0023] (2) Hollow fiber extrusion molding:

[0024] (2-1) The above-mentioned blend raw materials are added in the twin-screw extruder to form a molten blend, the feed rate of the raw materials is 4 kg / hour, and the extruder is di...

Embodiment 1

[0050] The mass percentage concentration is 32% (wt) PVDF resin (brand is SOFEF6020, manufactured by Belgian SOLVAY company) and the mass percentage concentration is 4% (wt) PMMA resin (brand is CM205, manufactured by Taiwan Chi Mei Company) composition The film-forming polymer is added in the mixed latent solvent of cyclohexanone and tributyl citrate, wherein the mass percent concentration of cyclohexanone is 48% (wt), and the mass percent concentration of tributyl citrate is 12 % (wt), and then add water-soluble additive PEG600 accounting for 10% (wt) of the total amount of the blended polymer. Put the above mixed material into a melt mixer, melt and mix evenly at a temperature of 160° C., and then cool and granulate in air to obtain a blended raw material for film making. Add the prefabricated blended raw materials into the twin-screw extruder at a feed rate of 4kg / h. The temperatures in zones 1-8 of the extruder are 140°C, 155°C, 165°C, 165°C, 170°C, 170°C, 160°C, 160°C, ...

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Abstract

The invention relates to a method for preparing a porous polyvinylidene fluoride alloy membrane for wastewater treatment and recycling, and belongs to the technical field of membrane separation technology and wastewater treatment and reutilization. The method comprises the following steps: firstly, weighing polyvinylidene fluoride, polymethyl methacrylate, a diluent or a latent solvent, and an additive according to proportion, placing the raw materials into a mixer in turn for mixing, cooling and granulating the mixture in the air, and obtaining blend raw materials; and secondly, adding the blend raw materials into a double screw extruder to form fused blends, making the fused blends be extruded by double screws and pass through a filter and a spinning pump in turn to form hollow nascent fibers, cooling and washing the hollow nascent fibers, and drying the hollow nascent fibers in the air. The porous polyvinylidene fluoride alloy hollow fiber microporous membrane prepared by the method has good chemical corrosion resistance and hydrophilicity, high strength, large flux, good toughness, uniform pore distribution and superior pollution resistance, and is most suitable to be used in MBR.

Description

technical field [0001] The invention relates to a method for preparing a porous polyvinylidene fluoride alloy membrane used for waste water treatment and reuse, and belongs to the technical fields of membrane separation technology and waste water treatment and resource utilization. Background technique [0002] Polyvinylidene fluoride (hereinafter referred to as PVDF) porous membrane has attracted the attention of membrane science and technology researchers for its excellent chemical stability, good toughness, radiation resistance, and high temperature resistance. The ultra- and micro-filtration membranes that have been successfully developed can be used in industrial fields such as petroleum, chemical industry, medicine, biology, energy, environmental protection, and water treatment. However, due to the strong hydrophobicity of PVDF, the application of the membrane is limited, especially when it is used in sewage treatment, due to serious membrane fouling, the water flux de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08C02F1/44
Inventor 洪耀良奚韶锋
Owner 苏州膜华材料科技有限公司
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