Preparation method of unbraced high-strength polyether sulfone flat-sheet microporous membrane

A polyethersulfone, high-strength technology, applied in the field of unsupported high-strength polyethersulfone flat microporous membrane and its preparation, can solve the problems of easy breakage, poor repeatability, unsuitable for industrialization, difficult pore structure regulation, etc., and achieve a good membrane. Structure and performance, multi-process feasibility, good adjustment effect

Pending Publication Date: 2019-01-01
杭州安诺过滤器材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.
Patent CN101790413B provides a polyethersulfone-containing membrane stock solution, a separation membrane, and a manufacturing method for the separation membrane wit

Method used

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  • Preparation method of unbraced high-strength polyether sulfone flat-sheet microporous membrane
  • Preparation method of unbraced high-strength polyether sulfone flat-sheet microporous membrane
  • Preparation method of unbraced high-strength polyether sulfone flat-sheet microporous membrane

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: 16% polyethersulfone resin (Basf Corporation 6020P), 15% diethylene glycol, 15% polyvinylpyrrolidone K-17 and 0.5% polyoxyethylene-polyoxypropylene block copolymer Add F127 and 53.5% dimethylformamide into a stirring tank, stir at 60°C for 12 hours, filter and vacuum defoam for 24 hours to obtain a casting solution. Extrude and cast the above-mentioned casting solution with a temperature of 35 degrees on a steel plate through a spinneret to obtain a support to obtain a flat original film. After a period of water vapor with a humidity of 95%, the residence time is 100s, after steam-liquid phase inversion, it is immersed in a rinsing water tank, and finally dried to prepare an unsupported high-strength polyethersulfone flat microporous membrane. The surface of the membrane is a smooth and single open microporous structure (attached figure 1 , 4 ), the pores at 20 μm below the surface cortex 2 on the cross-section are the smallest, here is the separation la...

Embodiment 2

[0034] Embodiment 2: 14% polyethersulfone resin (Basf Corporation 6020P), 11% triethylene glycol, 14% polyvinylpyrrolidone K-30 and 1.5% sulfonated polyethersulfone (sulfonated degree 25% ), 59.5% dimethylacetamide was added in a stirring tank, stirred at 60° C. for 12 hours, filtered, and vacuum defoamed for 24 hours to obtain a casting solution. Extrude and cast the above-mentioned casting solution at a temperature of 30°C on a steel plate through a spinneret to obtain a support to prepare a flat original film. After a period of water vapor with a humidity of 97%, the residence time is 180s, after steam-liquid phase inversion, immersed in a rinsing water tank, and finally dried to prepare an unsupported high-strength polyethersulfone flat microporous membrane. The surface of the membrane is a smooth and single-opened microporous structure. The pores at 25 μm below the surface skin layer 2 on the cross-section are the smallest. Here is the separation layer 1. The pore diamete...

Embodiment 3

[0035] Embodiment 3: 18% polyethersulfone resin (Basf Corporation 6020P), 18% ethylene glycol, 12% polyvinylpyrrolidone K-30 and 42% N-methylpyrrolidone, 10% dimethyl sulfoxide are added by weight percentage Stir at 60° C. for 12 hours in a stirring tank, filter, and vacuum defoam for 24 hours to obtain a casting solution. Extrude and cast the above-mentioned casting solution at a temperature of 45°C on a steel plate through a spinneret to obtain a support to prepare a flat original film. After a period of water vapor with a humidity of 97%, the residence time is 30s, after steam and liquid phase inversion, it is immersed in a rinsing water tank, and finally dried to prepare an unsupported high-strength polyethersulfone flat microporous membrane. The surface of the membrane is a smooth and single-open microporous structure. The pores at 10 μm below the surface skin layer 2 on the cross section are the smallest. This is the separation layer 1. The pore diameters from the separa...

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Abstract

The invention relates to the research field of microporous separation membrane materials, and aims at providing an unbraced high-strength polyether sulfone flat-sheet microporous membrane and a preparation method. The microporous membrane comprises an upper surface leather layer and a lower surface leather layer, wherein the upper surface leather layer and the lower surface leather layer are respectively provided with micropores, the micropores between the upper and lower surface leather layers are distributed in an hourglass-shaped asymmetric gradient sponge shape, and the middle part of themicropores are a separation layer of the membrane. The method comprises the following steps: mixing polyether sulfone, an induction pore forming agent, a hydrophilic additive and a solvent to preparea casting solution; (b) extruding and casting the casting solution from a spinneret plate onto a steel plate to obtain support, and preparing the flat-sheet crude membrane; (c) forming the membrane byvirtue of a dry-type mist spraying process; and (d) rinsing and drying. A product of the microporous separation membrane material is high in separation efficiency, high in interception capacity, andhigh in flux. The method is relatively simple and easy; the steam-liquid-induced phase inversion composite method enables the membrane production method to be high in process feasibility, and the membrane structure and performance can be better adjusted.

Description

technical field [0001] The invention belongs to the field of preparation of microporous separation membranes, in particular to an unsupported high-strength polyethersulfone flat microporous membrane and a preparation method thereof. Background technique [0002] In the past 20 years, the industrialization of microporous membranes and related filter 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 chem...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/06B01D71/68
CPCB01D67/0002B01D69/06B01D71/68
Inventor 林卫健阮文祥王建黎支田田
Owner 杭州安诺过滤器材有限公司
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