| 摘要 |
CMC gels are prepared at controlled duration of gelation by mixing together (a) a water solution of certain chelated aluminum salts adjusted to a pH of 4.5 - 9.0, and (b) a water solution of CMC, the pH of the final mixture being about 4.5 - 7.0. Preferred aluminum salts are aluminum sulfate, sodium, potassium or ammonium alum. Citric acid and its sodium, potassium and other water soluble salts are preferred as chelants. |
