DESICCANT-COATED SUBSTRATE AND METHOD OF MANUFACTURE

摘要

Desiccant-coated substrates, regeneratable rotary dehumidification wheels and ot her devices for gas (e.g., air) treatment using those substrates, and processes for making them are disclosed. The substrates may have coatings in thicknesses of from about 2 to about 10 thousandths of an inch (about .051 to .254 mm) containing particles of one or mo re adsorbent desiccants and an organic water-based binder. The desiccant particles retain a high fraction of their original absorption capa city because the pores of the desiccant particles contain a pore-clearing agent prior to the binder setting and the pore-clearing agent leav es the pores during the manufacturing process to prevent the binder from blocking the pores. In preferred embodiments a mixture of different desiccants is used and a particle suspending agent keeps the particles well-mixed so that the desiccant particles in the coated substrate will be as well-mixed as possible. The suspending agent may also function as the pore-clearing agent. A pH-adjusting agent may be used t o control the pH of the coating if the binder or another of the coating is pH-sensitive.