Ion exchange resin (ion exchange resin) is a kind of polymer with exchangeable ions (cations or anions), which is called cation exchange resin if exchangeable ions are cations; otherwise, it is anion exchange resin. Ion exchange resin has the functions of desalination and softening, decolorization and deodorization, adsorption concentration, separation and purification, acid-base neutralization, catalysis, chemical analysis, environmental protection, etc.