| 摘要 |
PURPOSE:Dicyandiamide or cyanamide is allowed to act on the amino group in chitosan to give a novel chitosan derivative which is suitable for use as a coagulant or metal ion adsorbent, because it has biguanide and guanidine groups. CONSTITUTION:Chitosan, preferably its acid salt such as a salt with 0.1-1.0 normal hydrochloric acid is combined with water and a metal salt such as copper chloride or chromium acetate, then allowed to react with dicyandiamide and/or cyanamide, preferably at 100-150 deg.C for 2-7hr, to give a chitosan derivative bearing biguanide and/or guanidine groups.
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