Preparation and characterization of functional humidity-controlling materials

Humidity-controlling material was prepared with mineral salt,pore-forming agent(NH4HCO3) and sodium carboxymethyl cellulose(CMC) as the matrix material.Factors influencing performance of humidity-controlling material have been investigated.The structure and performance of the materials were characterized by means of analytical methods,such as FT-IR and SEM.The results indicated that the humidity-controlling material had great hygroscopicity and moisture capacity.Hygroscopic capacity of the humidity-controlling material could reach 132%,55% and 30% under different humidity(80%,60% and 40% RH) respectively when the material was prepared with CMC,LiCl and NH4HCO3 in the ratio of 6∶3∶4 in mass.Its also had great moisture capacity.