Preparation method of high-heat-resistant separation membrane material

Abstract

The invention discloses a preparation method of a high-heat-resistant separation membrane material, and belongs to the technical field of membrane separation material preparation. Comprising the following steps: adding a polyimide modified body into a film-forming polymer material to prepare a film casting solution, curing and rinsing the film casting solution to obtain a porous support layer material, fully infiltrating the porous support layer material in a water-phase solution tank, removing surface moisture, coating the surface of the porous support layer material with solvent oil containing an organic-phase monomer, and drying the porous support layer material to obtain the polyimide film. And finishing the interfacial polymerization process of the composite membrane through oven heat treatment to obtain the high-heat-resistant separation membrane material. According to the preparation method of the high-heat-resistant separation membrane material, thermodynamic stability performance such as thermal shrinkage resistance and thermal deformation resistance of the porous supporting layer material is improved; the prepared high-heat-resistant separation membrane material can continuously and stably operate in a medium-high-temperature water medium at the temperature of 70 DEG C or above and can be circularly and intermittently cleaned in a high-temperature water medium at the temperature of 90 DEG C or above for more than 30 minutes and more than or equal to 45 times; the separation performance, such as interception performance, water production efficiency and the like, is equal or more than equal.

Description

technical field [0001] The invention belongs to the technical field of preparation of membrane separation materials, in particular to a preparation method of a high heat-resistant separation membrane material. Background technique [0002] Membrane materials are one of the keys to the realization of high-performance membrane separation technology. They mainly include reverse osmosis and nanofiltration composite organic membrane materials represented by polysulfone and polyamides, and polytetrafluoroethylene, polytetrafluoroethylene and other organic silicon materials. There are several categories of hollow fiber ultrafiltration membrane materials represented by fluorine materials and inorganic membrane materials represented by ceramics. Among them, organic membrane materials are superior to inorganic ceramic membranes due to their good toughness and high separation accuracy, and are widely used in salt ion separation / regulation, drinking water purification and other applicat...

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Problems solved by technology

[0007] For the above-mentioned problems existing in the prior art, the purpose of the present invention is to design and provide a technical scheme for the preparation method of a high heat-resistant separation membrane material, which utilizes its high thermal stability of the polyimide material to react to the traditional interfacial polymerization reaction process. Preparation of porous substrates for reverse osmosis membrane materials, such as polysulfone and polyethersulfone materials, for further thermal stability and material interface strengthening, so as to prepare membrane separation materials that can support heat disinfection and high-temperature membrane filtration processes to make up for conventional membranes. During the high-temperature membrane filtration process, the poor thermal stability of the membrane pores caused the sudden drop in the permeated water flux and unstable performance.

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