Chitosan graft acrylic acid and acrylamide superabsorbents(CPAAM) are prepared by solution polymerization and soaked in ethanol-NaOH solution using chitosan

acrylic acid(AA) and acrylamide(AM) as raw materials(monomers)

potassium peroxydisulfate(KPS) as initiator

N

N’-methylene-bis-acrylamide(NMBA) as crosslinker

and the absorbencies in multiple component salt-mixing solutions are measured. The results have shown that the equilibrium absorbencies of the CPAAM decrease rapidly with increasing the concentration; the effect of the non-electrolyte solutions on the absorbency is little while the effect of the electrolyte solutions on it is large. The cation valence of the electrolyte solutions significantly affects the absorbency of the CPAAM; in the same concentration of solution

the effect of high valence cations is greater than that of the monovalent cations for the absorbency of CPAAM. These are agreeable with the results of the absorbencies in single salt solutions for high water-absorbing resins. The order of the absorbencies in binary NH

4+

/Ca

2+

salt-mixing solutions for CPAAM is NH

4

HCO

3

/CaCl

2

>

(NH

4

)

3

PO

4

/CaCl

2

>

NH

4

Cl/CaCl

2

while that in ternary K

+

/NH4

+

/urea salt-mixing solutions for CPAAM is KCl/NH

4

HCO

3

/CO(NH

2

)

2

>

KCl/(NH

4

)

3

PO

4

/CO(NH

2

)

2

and that in quaternary K

+

/NH4

+

/urea salt-mixing solutions is (NH

4

)

3

PO

4

/KCl/MgCl

2

/CO(NH

2

)

2

>

(NH

4

)

3

PO

4

/KCl/CaCl

2

/CO(NH

2

)

2

. The suitable water temperatures for the maximum absorbencies in the salt-mixing solutions for CPAAM are all about 25℃.