Preparation method for chelate ion-exchange fiber

Abstract

The invention provides a preparation method for a chelate ion-exchange fiber. The preparation method comprises the following steps: finishing the nucleophilic reaction of amido functional resin and 5-chloromethyl salicylaldehyde in a solution in advance, thereby obtaining a quaternary amine functional resin solution; coating a substrate fiber, thereby obtaining a quaternary amine functional fiber; and performing the condensation reaction of the quaternary amine functional fiber and the amino compound, thereby finally obtaining the chelate ion-exchange fiber with a quaternary amine and salicylaldehyde peptide compound structural unit linked with the surface layer. According to the preparation method, the possibility of reaction between the 5-chloromethyl salicylaldehyde and the substrate fiber is avoided, the physical adsorption of the substrate fiber to the 5-chloromethyl salicylaldehyde is eliminated, and the local reaction selectivity and the use ratio of the 5-chloromethyl salicylaldehyde are increased.

Description

technical field [0001] The invention relates to a chelating ion exchange fiber, in particular to a chelating ion exchange fiber formed by coating the fiber with a chelating resin, and belongs to the field of functional materials. technical background [0002] The existing methods for preparing chelated ion exchange fibers mainly include: one is the chemical modification of the base fiber, so that the base fiber has ion adsorption capacity and ion chelation capacity. However, after the base fiber is chemically modified, some mechanical properties are significantly deteriorated, which affects the processing performance and use performance of the chelated ion exchange fiber. The second is the copolymerization resin spinning of the functional monomer and the second monomer, or the graft copolymerization of the functional monomer to the base fiber. However, most of the functional monomers are complex or expensive in synthesis technology, and the functional resins are difficult t...

AI Technical Summary

Problems solved by technology

However, during the reaction process between the functional fiber coated with amino resin and 5-chloromethyl salicylaldehyde, not only the tertiary amino group and 5-chloromethyl salicylaldehyde undergo nucleophilic reaction, but also the hydroxyl groups on the surface of the substrate fiber It can undergo nucleophilic reaction with 5-chloromethyl salicylaldehyde, and the microporous capillary action of the substrate fiber and the hydrogen bond of the hydroxyl group on the substrate fiber to 5-chloromethyl salicylaldehyde will retain the 5-chloromethyl salicylaldehyde that has not undergone nucleophilic reaction. Chloromethyl salicylaldehyde, the washing and extraction of post-treatment organic solvents alone cannot completely remove and recycle excess 5-chloromethyl salicylaldehyde that did not participate in the reaction, resulting in 5-chloromethyl salicylaldehyde lower utilization of