Method for preparing oxygen-enriched super-crosslinked resin based on Friedel-Crafts alkylation reaction and application of oxygen-enriched super-crosslinked resin

Abstract

The invention relates to a method for preparing oxygen-enriched super-crosslinked resin based on a Friedel-Crafts alkylation reaction and application of the oxygen-enriched super-crosslinked resin, and the method for preparing the oxygen-enriched super-crosslinked resin based on the Friedel-Crafts alkylation reaction comprises the following steps: (1) swelling chloromethylated crosslinked polystyrene; (2) preparing oxygen-enriched precursor resin, namely carrying out a Friedel-Crafts reaction on the chloromethylated crosslinked polystyrene treated in the step (1) and oxygen-containing small molecules at 40-50 DEG C under the catalysis of a Lewis acid for a preset time; and (3) preparing the oxygen-enriched super-crosslinked resin, namely carrying out a Friedel-Crafts reaction on the oxygen-enriched precursor resin prepared in the step (2) and rigid small molecules at 80-90 DEG C for a preset time, and weaving the oxygen-enriched precursor resin skeleton. The oxygen-enriched super-crosslinked resin is easy to elute after adsorption, can be repeatedly used, has a good repeated use effect, can be widely applied to the fields of chemical analysis, drug separation and purification, environmental pollution treatment and the like, and has a great development prospect.

Description

technical field [0001] The invention belongs to the technical field of functional polymer modification, and specifically relates to a method for preparing oxygen-enriched supercrosslinked resin based on Friedel-Crafts alkylation reaction and the application of oxygen-enriched supercrosslinked resin. Background technique [0002] In the early 1970s, Davankov and Tsyurupa used polystyrene as a raw material, used Lewis acid as a catalyst, and used an external linking agent in a suitable solvent to cross-link through the Friedel-Crafts reaction to prepare a class of porous polymers with unique structures and excellent properties. Compounds, also known as hypercrosslinked resins (HCPs). Hypercrosslinked resins usually have structural characteristics such as large specific surface area, small average pore size, narrow pore size distribution, and good mechanical strength. Because of their simple and efficient synthesis methods, easy functionalization, low cost, and mild synthesis c...

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Problems solved by technology

Chinese patent (publication number CN101190974) discloses a pyrrolidone-based modified composite functional adsorption resin and its preparation method; Chinese patent (publication number CN 1858088A) discloses a pyridyl-based modified composite functional super-crosslinked resin and its preparation method, The surface of these post-crosslinked resins is loaded with a certain amount of pyrrolidone groups, pyridyl groups, etc., but the preparation process is more complicated, and highly toxic chloromethyl ether is used as a crosslinking agent. Substances of different sizes and polarities (such as: phenol, salicylic acid, benzoic acid, rhodamine B, β-naphthol, etc.) have certain adsorption capacity, but the adsorption selectivity is not obvious

[0005] Although the hypercrosslinked resins of the prior art have certain adsorption properties to phenol, benzoic acid, salicylic acid, rhodamine B, β-naphthol, etc., the adsorption effect is poor (the amount of adsorption is small, and the time to reach adsorption equilibrium is long) , and the adsorption selectivity is poor

The main reason is (1) the resin cross-linking is too high, the porosity is dense, and only small molecules (such as N 2 etc.), and polar molecules with relatively large molecular sizes are not easy to diffuse into the pores, resulting in poor adsorption effect of polystyrene ultra-high cross-linked resins on polar molecules; The content of functional groups is not high and the problem is uncontrollable. The Friedel-Crafts alkylation reaction of chloromethylated cross-linked polystyrene and polar aromatic organics is competing with its own Friedel-Crafts alkylation reaction ; Since the Friedel-Crafts alkylation reaction of chloromethylated cross-linked polystyrene belongs to a similar intramolecular reaction, the amount of polar aromatic organics introduced is not high, and the functional group content is low (below 5%); and, Since the Friedel-Crafts alkylation reaction is uncontrollable, the content of functional groups loaded on the backbone of the hypercrosslinked polymer obtained after the reaction is also uncontrollable

Polar group-modified hypercrosslinked resins can be obtained by means of post-modification, but the methods of post-modification are limited, and they are all based on the reaction with residual chlorine, which inevitably makes the specific surface area of ​​the hypercrosslinked resin prepared in advance Low, the unique advantages of the pore structure are lost

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