Recycling method of waste polyvinylidene fluoride (PVDF) flat sheet membrane

A polyvinylidene fluoride, flat film technology, applied in recycling technology, plastic recycling, chemical instruments and methods, etc., can solve the problems that do not involve the separation method of membrane material and support layer, etc.

Inactive Publication Date: 2014-04-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the patent with the publication number CN101422708A develops a recycling method for waste PVDF hollow fiber membranes, it does not involve the separation method of the membrane material and the support layer, and the recovery and reuse method of the support layer material

Method used

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  • Recycling method of waste polyvinylidene fluoride (PVDF) flat sheet membrane

Examples

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Effect test

example 1

[0017] Cut the waste PVDF flat membrane into a 17cm×20cm membrane, first soak and clean it with a NaClO solution with a concentration of 10000ppm for 5 hours, then soak and clean it with a concentration of 5% HCl for 5 hours, and finally rinse it with clean water until it is neutral, and then dry it at 60 °C for drying. Submerge the dried waste film in DMAC, the amount of extraction solvent is 0.5L per square meter of waste film, soak and dissolve at 20°C for 10 hours, dissolve the PVDF on the surface of the film, and then use the centrifugation method to solidify the extract with the non-woven fabric. liquid separation. Centrifuge at 10,000rpm for 20min to remove impurity particles such as non-woven fibers, then add 50g of fresh PVDF powder and 50g of PVP to each liter of PVDF extract, and stir to dissolve. After standing for 48 hours for defoaming, the membrane was formed by the NIPS method. Immerse the diaphragm in deionized water, the water temperature is 25°C, and the i...

example 2

[0019] Cut the waste PVDF flat membrane into a 15cm×20cm membrane, first soak and clean it with a NaClO solution with a concentration of 4000ppm for 12 hours, then soak and clean it with a concentration of 3% HCl for 3 hours, and finally rinse it with clean water until it is neutral, and dry it at 60 °C for drying. The dried waste membrane was immersed in NMP, soaked and dissolved at 40°C for 10 hours to dissolve the PVDF on the surface of the membrane, and then the extract was separated from the non-woven fabric by filtration. Remove impurity particles such as non-woven fabric fibers by filtration with a 220 μm filter membrane. Subsequently, 25 g of fresh PVDF powder and 80 g of PEG were added to every liter of PVDF extract, and stirred to dissolve. After standing for 48 hours for defoaming, the membrane was formed by the NIPS method. Immerse the diaphragm in deionized water, the water temperature is 25°C, and the immersion time is 20min. The performance of the PVDF regene...

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Abstract

The invention relates to a recycling method of a waste polyvinylidene fluoride (PVDF) flat sheet membrane, which comprises the recycling of the PVDF and a non-woven supporting layer on the surface of the membrane. The method comprises the following steps: firstly, removing contaminants from the surface of the waste membrane in a cleaning manner; drying the waste membrane and then dissolving the waste membrane in an organic solvent in a soaking manner so as to recycle the PVDF on the surface of the membrane; performing solid-liquid separation on the PVDF so as to obtain a PVDF extracting solution and a non-woven fabric; filtering and removing impurities from the PVDF extracting solution in a high-speed centrifugation manner or by using a filter membrane; adding partially fresh PVDF resins, pore-foaming agents, additives and the like into the PVDF extracting solution so as to prepare a membrane casting solution; preparing a regenerated flat sheet membrane by using a nonsolvent induce phase separation (NIPS) method; washing, drying and smashing the non-woven polyethylene terephthalate (PET); and then processing the non-woven PET into PET granules by using an extrusion melting method.

Description

technical field [0001] The invention relates to a recovery and reuse method of waste polyvinylidene fluoride flat film, and belongs to the technical field of polymer material recovery and application. Background technique [0002] In recent years, the utilization of sewage resources has become the only way to deal with the shortage of water resources and reduce pollution discharge. Membrane Bioreactor (MBR) is an efficient water treatment system that combines membrane separation technology with wastewater biological treatment system. At present, China's MBR technology market is one of the fastest growing fields and regions in the world. It is estimated that by 2015, China's membrane material market will reach 27 billion yuan, and the sewage treatment membrane technology market will reach 140 billion yuan. Membrane is the core of membrane separation technology. At present, polyvinylidene fluoride (PVDF), polyethylene (PE) and polypropylene (PP) membranes are used in large qu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/06C08J11/08
CPCY02W30/62
Inventor 任月萍李秀芬吴杰
Owner JIANGNAN UNIV
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