A kind of high mechanical strength anion exchange resin of phenolic-polyacrylic acid interpenetrating structure and preparation method thereof

Abstract

Belonging to the field of resin materials, the invention in particular relates to a high mechanical strength anion exchange resin with a phenolic-polyacrylic interpenetrating structure and a preparation method thereof. Specifically, the preparation method comprises the steps of: (1) mixing a phenolic compound, an aldehyde compound and polyacrylic anion exchange resins evenly; (2) separating resinout of the mixed solution obtained in step (1), mixing the resin with a disperse phase, adding a surfactant and an acidic or alkaline catalyst, and carrying out reaction at 35-105DEG C; and (3) cleaning the resin obtained in step (2) to neutral, then performing mixing with a disperse phase, adding an alkaline catalyst, carrying out reaction at 35-105DEG C, separating out resin at the end of the reaction, and performing cleaning to neutral. The resin prepared by the method provided by the invention has significantly improved mechanical strength, and the post-grinding ball rate can reach 99.9%,also the resin has large strong basic anion exchange capacity, and can be used for removal of anion pollutants in actual wastewater.

Description

technical field [0001] The invention belongs to the field of resin materials, in particular to a high mechanical strength anion exchange resin with a phenolic-polyacrylic acid interpenetrating structure and a preparation method thereof. Background technique [0002] Resin materials are widely used in water treatment due to their advantages such as adjustable structure, high adsorption capacity, strong selectivity and easy desorption and regeneration. Polyacrylic resin and polystyrene resin are the two most widely used resins at present, but for organic pollutants with strong hydrophilicity, polyacrylic resin is superior to polystyrene resin in terms of adsorption and regeneration performance. The further development of magnetic polyacrylic resin, such as the magnetic acrylic strong base anion exchange microsphere resin disclosed in patent CN101781437A, the polyacrylic resin is easier to be separated in the actual water treatment due to its magnetic properties, so that it can...

AI Technical Summary

Problems solved by technology

[0003] However, whether it is magnetic or non-magnetic polyacrylic resin, the synthesis of this type of resin needs to use acrylate or glycidyl acrylate as a monomer, resulting in poor mechanical strength of the synthesized resin, making it in contact with each other in water treatment. During the friction process, 5-10 µm resin suspended particles are produced, resulting in resin loss and secondary pollution of water

At present, in order to improve the mechanical strength of polyacrylic acid resin, some researchers adopt different synthesis methods and processes, such as adjusting the type and content of crosslinking agent, optimizing the ratio of monomers and changing experimental conditions, etc., but the mechanical strength of polyacrylic acid resin The improvement is not obvious

Although some researchers introduce inorganic nanoparticles into polyacrylic resin particles to change their mechanical strength, as disclosed in patent CN107754867A, the in-situ method is used to introduce magnetic particles into polyacrylic resin, and then use silane coupling agent to wrap magnetic polyacrylic resin, A magnetic polyacrylic resin with high mechanical strength has been obtained, but the resin synthesized by this method will also have a certain degree of shedding of inorganic magnetic particles during the water treatment process, thereby affecting the water quality after treatment.

In addition, patent CN1470541A and patent CN1050882A disclose the method of using cation exchange resin as a catalyst to prepare phenolic resin, but it is different from the high mechanical strength anion exchange resin and preparation method of a phenolic polyacrylic acid interpenetrating structure disclosed in this patent