Abstract:

Acrylic acid resins were analysed based on adsorption kinetics model.Under the circumstances of static moisture absorption and dynamic moisture absorption,the adsorption kinetics data showed the moisture adsorption process of organic moisture absorbents could be better described by the pseudo-second-order model. The properties of organic moisture absorbents were influenced by two main factors, which were relative moisture and adsorption properties of polymer resin itself.Equilibrium experiments of static moisture absorption demonstrated that the maxmal moisture absorbency of P(AA-MA-AM) reached 0.049 g/g in enclosed space. The sequence of static absorption rate was as follows:PAM,P(AA-MA),P(AA-AM),P(AA-MA-AM),PAA. Equilibrium experiments of dynamic moisture absorption indicate that the highest moisture absorbency of P(AA-AM) was 0.92 g/g. The sequence of dynamic absorption rate was as follows: PAM,P(AA-AM),P(AA-MA),P(AA-MA-AM),PAA.Regeneration experiments proved that equilibrium moisture absorbency of organic moisture absorbents decreased no more than 2% after regeneration treatment and its property was still steady.

Key words: organic moisture absorbents, static moisture absorption, dynamic moisture absorption, adsorption kinetics