A polyvinylidene fluoride hollow fiber membrane with a highly asymmetric sponge structure
A polyvinylidene fluoride, asymmetric technology, applied in the field of membrane separation, can solve the problems of high cost, high production cost, difficult control, etc., and achieve the effects of economical and environmentally friendly operation, simple preparation method and excellent performance
Active Publication Date: 2016-05-18
TONGXIANG JIANMIN FILTER MATERIALS
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Problems solved by technology
Patent CN102245284A discloses a spongy polyvinylidene fluoride hollow fiber membrane, but the membrane adopts a costly thermal-induced phase method, and the cross-sectional structure of the prepared membrane is basically isotropic, and the cross-sectional structure has no obvious asymmetry sex
Patent CN101890303A discloses a polyvinylidene fluoride hollow fiber asymmetric membrane, but the membrane is also made by thermotropic phase, the extraction process of the subsequent diluent is complicated and difficult to control, and the production cost is very high
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[0015] The technical solutions of the present invention will be further specifically described below through examples.
[0016] Example: In a heatable kettle, pour a mixture of 500g of γ-butyrolactone and 3450g of N-methylpyrrolidone at 70°C, and dissolve 800g of polyvinylidene fluoride and 250g of Polyvinylpyrrolidone (PVP, K90) is made into a transparent, uniform and stable casting liquid. After standing for defoaming, it is sent to the forming spinneret, and the forming spinneret passes through the annular gap of the hollow fiber die at 10g / min extrusion, while the central opening of the hollow fiber die extrudes the inner filler, and the inner filler contacts with the inside of the hollow fiber to make a hollow fiber, with 50wt.% N-methylpyrrolidone aqueous solution as the inner filler, and the hollow fiber leaves The hollow fiber die passes through an air space of 8 cm in length within 5 seconds, and then immersed in a water bath at 50°C for solidification to form a poly...
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Abstract
The invention provides a polyvinylidene fluoride hollow fiber film with a highly-asymmetric spongy structure. The polyvinylidene fluoride hollow fiber film is prepared by preparing a transparent, uniform and stable film casting liquid from polyvinylidene fluoride, an organic polar solvent, a hydrophilic second polymer and an organic micromolecular additive, extruding the film casting liquid via the annular gap of the hollow fiber die head of a molding spinning device, extruding an inner filling material through the center opening of the hollow fiber die head so as to prepare a hollow fiber, wherein the inner filling material contacts with the interior of the hollow fiber, allowing the hollow fiber to pass through an air gap with a length of 0 to 20 cm in 0 to 10 s after the hollow fiber leaves the hollow fiber die head, then soaking the hollow fiber in a water bath with a temperature of 0 to 80 DEG C for consolidation forming so as to prepare the polyvinylidene fluoride hollow fiber film, fully extracting the polyvinylidene fluoride hollow fiber film in hot water with a temperature of 20 to 80 DEG C and carrying out drying. The polyvinylidene fluoride hollow fiber film with the highly-asymmetric spongy structure has far better permeation flux and interception capability compared with common polyvinylidene fluoride hollow films and has excellent performance; and the preparation method for the film is simple, economic and environment-friendly and is easy to operate.
Description
technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a polyvinylidene fluoride hollow fiber membrane with a highly asymmetric sponge structure, which is suitable for the recycling and utilization of advanced sewage treatment and the advanced purification treatment of water supply and the like. Background technique [0002] As a thermoplastic semi-crystalline polymer, polyvinylidene fluoride resin has the characteristics of solvent resistance, oxidation resistance, acid and alkali resistance, ultraviolet resistance, aging resistance and weather resistance, and is recognized as a film material with excellent performance. At present, commercialized polyvinylidene fluoride membranes are basically prepared by immersion precipitation method, but the pore size between the skin layer and the sublayer of the asymmetric structure in the polyvinylidene fluoride membrane prepared by this method suddenly increases from th...
Claims
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IPC IPC(8): B01D71/34B01D69/08B01D69/02B01D67/00
Inventor 沈红梅计根良沈勤梁杨敏吴薛亮
Owner TONGXIANG JIANMIN FILTER MATERIALS