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Polyether sulfone hollow fiber microporous membrane and preparation method

A technology of polyethersulfone and microporous membrane, which is applied in the field of polyethersulfone hollow fiber microporous membrane and its preparation, can solve the problems of poor repeatability, unsuitable for industrialization, and poor stability of formula system, and achieve multi-process feasibility, Effect of adjusting membrane structure and performance, good membrane structure and performance

Inactive Publication Date: 2018-12-18
杭州汉膜新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent US4774039 discloses a method for preparing an asymmetric flat membrane without a finger-like pore structure. The formulation system used has poor stability and poor repeatability and is not suitable for industrialization.

Method used

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  • Polyether sulfone hollow fiber microporous membrane and preparation method
  • Polyether sulfone hollow fiber microporous membrane and preparation method
  • Polyether sulfone hollow fiber microporous membrane and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: 16% polyethersulfone resin (Basf Corporation 6020P), 15% diethylene glycol, 15% polyvinylpyrrolidone K-17 and 0.5% polyoxyethylene-polyoxypropylene block copolymer Add F127, 40.5% dimethylformamide and 13% dimethyl sulfoxide into a stirring tank, stir at 60° C. for 12 hours, filter and vacuum defoam for 24 hours to obtain a casting solution. The hollow fiber original membrane is obtained by extruding the above-mentioned casting liquid at a temperature of 40° C., 85% by weight dimethylformamide, and 15% pure water mixed core liquid through a spinneret. After passing through a water vapor section with a humidity of 96%, the residence time is 1s, after steam-liquid phase inversion, immersed in a rinsing water tank, and finally dried to prepare a polyethersulfone hollow fiber microporous membrane. The outer skin layer of the membrane is a smooth and single open microporous structure (attached figure 1 ), the pores at about 15 μm inside the outer surface corte...

Embodiment 2

[0029] Embodiment 2: 15% polyethersulfone resin (Basf Corporation 6020P), 13% triethylene glycol, 12% polyvinylpyrrolidone K-30 and 1.5% sulfonated polyethersulfone (sulfonated degree 25% ), 58.5% dimethylacetamide were added in a stirring tank, stirred at a temperature of 60°C for 12 hours, filtered, and vacuum defoamed for 24 hours to obtain a casting solution. The above-mentioned casting solution at a temperature of 40° C. and a core solution mixed with 80% dimethylformamide and 20% pure water by weight are extruded through a spinneret to obtain a hollow fiber original membrane. After passing through a water vapor section with a humidity of 97%, the residence time is 1.5s, after steam-liquid phase inversion, immersed in a rinsing water tank, and finally dried to prepare a polyethersulfone hollow fiber microporous membrane. The outer skin layer of the membrane is a smooth and single-opened microporous structure. The pores at 20 μm inside the outer skin layer of the cross-sec...

Embodiment 3

[0030] Embodiment 3: 18% by weight polyethersulfone resin (BASF 6020P), 18% ethylene glycol, 12% polyvinylpyrrolidone K-30 and 52% N-methylpyrrolidone are added in the stirring tank, at 80 ℃ temperature The mixture was stirred for 12 hours, filtered, and vacuum degassed for 24 hours to obtain the casting solution. The above-mentioned casting liquid at a temperature of 60° C. and a core liquid mixed with 70% dimethylformamide and 30% pure water by weight are extruded through a spinneret to obtain a hollow fiber original membrane. After a period of water vapor with a humidity of 95%, the residence time is 3s, after steam-liquid phase inversion, immersed in a rinsing water tank, and finally dried to prepare a polyethersulfone hollow fiber microporous membrane. The average pore size distribution of the hollow fiber microporous membrane is 0.05 μm, the inner diameter is 0.7 mm, and the outer diameter is 1.3 mm. The pure water flux at 0.1MPa and 25°C is 1200L / m 2 h.

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Abstract

The invention relates to the field of researching microporous separating membrane materials and aims at providing a polyether sulfone hollow fiber microporous membrane and a preparation method. The microporous membrane comprises an inner surface skin layer and an outer surface skin layer, wherein micropores are distributed on the surfaces of the inner surface skin layer and the outer surface skinlayer, and the micropores are in a sand clock type asymmetric gradient sponge body shape in the sectional direction. The method comprises the steps: mixing and dissolving polyether sulfone, an inducing pore forming agent, a hydrophilic additive and a solvent to prepare a membrane casting solution; (b) extruding the membrane casting solution and a core solution in a dry mode by a spinneret plate toprepare a hollow fiber raw membrane; (c) forming a membrane through a dry type water mist spraying technology; (d) rinsing and drying. The product can fully protect a separation layer, the separationlayer is prevented from being mechanically damaged and plugged by viruses and particulate matters, and the structure has the advantages of high separation efficiency and strong interception capacity.The method is relatively simple, easy and practical; by means of a steam and liquid conversion compound method, more technological feasibility is given to the membrane manufacturing method, and a structure and performance of the membrane can be better adjusted.

Description

technical field [0001] The invention belongs to the research field of microporous separation membrane materials, in particular to a polyethersulfone hollow fiber microporous membrane and a preparation method thereof. Background technique [0002] In the past 10 years, the industrialization of microporous membranes and related membrane products in my country has reached a certain scale. At present, the commercialized microporous membranes and widely used varieties in China mainly include the following categories: 1. Mixed fiber 2. Polyamides, such as nylon 6 (PA-6) and nylon 66 (PA-66) microporous membranes, this type of membrane has good hydrophilicity, and is more alkali-resistant than acid-resistant. In ketones, phenols, ethers and high molecular weight alcohols, it is not easily corroded. 3. Polyfluorine, such as polyvinylidene fluoride film (PVDF) and polytetrafluoroethylene film (PTFE). These two types of microporous membranes have excellent chemical stability and are ...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D67/00B01D69/08B01D71/68
CPCB01D61/147B01D67/0002B01D69/08B01D71/68
Inventor 阮文祥王建黎阮万民黄海波
Owner 杭州汉膜新材料科技有限公司
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