Modified ion exchange resin (IER) was obtained by impregnating IER into the saturated LiCl or MgCl2 solution

filtering

washing and drying sequentially. The desiccant coating was produced by means of electrostatic spraying and thermocuring the mixture of the pulverized modified IER and powder coating on aluminum foil surface of finned tube heat exchanger. XRD spectra showed that IER structure had no obvious change after modification. SEM images revealed that the desiccant coating could be uniformly and closely dispersed on the surface of aluminum foil and its thickness was about 120 μm. EDS analysis showed the composition and content of the desiccant coating. TG curves indicated that the mass loss of desiccant coating mainly happened in the range of 30—150℃ and 400—600℃. The former was associated with IER desorption

while the latter was related to thermal decomposition of IER and power coating. The static and dynamic adsorption curves of the modified desiccant coating indicated that adsorption performance was improved significantly after modification. Hygroscopic repeatability test demonstrated that the desiccant coating still had excellent stability for adsorption and desorption.