A kind of preparation method of homogeneous membrane

Abstract

The invention belongs to the technical field of porous material separation membranes and discloses a preparation method of a polymer homopore membrane. A polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer is taken as a template, resole is taken as a precursor, a compound adopting a regular structure is formed through self-assembly, and then aromatic dihalide or alkane dihalide is taken as a cross-linking agent, so that benzene rings in phenolic resin have a Friedel-Crafts reaction to be further cross-linked. In the reaction process, produced byproduct hydrogen halide removes a template, so that pores are formed during crosslinking, the homopore membrane is prepared with the one-step method. The homopore membrane prepared with the method has orderly arranged pore channels and uniform pore diameter and height, takes highly crosslinked phenolic resin as the framework and has good high-temperature resistance, acid and base resistance and organic solvent resistance. Raw materials are cheap and easy to obtain, equipment is simple, the preparation technology process is short, independent template removing and pore forming steps are not needed, and the preparation method is suitable for mass production and has bright application prospect in fields of separation, adsorption, heat insulation and the like.

Description

technical field [0001] The invention belongs to the technical field of porous material separation membranes, and in particular relates to a preparation method of a phenolic resin homoporous membrane. Background technique [0002] Homoporous membranes are porous materials with ordered channels and uniform pore size, and have important application values ​​in the fields of separation, catalysis, adsorption, and biomedicine. The template method is a widely used method for preparing homoporous membranes, which can be divided into hard template method and soft template method. The hard template method usually uses silicon-based materials as templates to replicate the established structure in reverse phase; while the soft template method uses block copolymers or surfactants as templates to self-assemble with organic precursors to form an ordered structure. Flexible and convenient, the shape and material itself can be effectively regulated according to the difference of the soft t...

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Problems solved by technology

Although this method can remove the template agent better, it often requires higher temperature and harsher conditions; especially for organic-organic materials, it will inevitably cause the shrinkage of the pores and the separation of functional groups when removing the template agent. At the same time, most of them become inorganic carbon materials after high-temperature calcination, which greatly limits its application range, especially in the field of separation membranes.

However, other methods for removing templates have been widely concerned by researchers, such as microwave digestion, supercritical fluid extraction, etching, solvent extraction and other methods. Compared with direct calcination methods, these methods often have template removal Incomplete, tedious and time-consuming, and require special equipment

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