PURPOSE: To obtain a novel synthetic swellable silicate having superior gel forming capacity by preparing a homogeneous precipitate consisting of silicon and magnesium, adding an exchangeable cation to the precipitate, carrying out a hydrothermal reaction, drying the reaction product, and pulverizing it.
CONSTITUTION: A homogeneous mixed soln. contg. silicic acid and a magnesium salt is prepared by mixing a silicic acid soln. with an aqueous magnesium salt soln. in a proper ratio, and an alkali soln. such as an aqueous ammonia soln. is added to the mixed soln. to form a precipitate. Soluble by-products are sufficiently removed from the precipitate by filtration and washing. The hydroxide or the like of a uni- or bivalent cation is added to the resulting homogeneous precipitate, and after adding fluorine ion as required, a hydrothermal reaction is carried out at 100W350°C. The reaction product is dried at ≤about 200°C and pulverized to obtain a synthetic swellable silicate represented by the general formula (where 0<a<10, 0<b≤1, 0<c≤2/3a+b, 1≤y≤2, and M is at least 1 kind of cation selected from alkali metallic ions, alkaline earth metallic ions, ammonium ion and amine).
ASAGA TADASU
HOTSUTA MASAMI
| JPS5124598A | 1976-02-27 | |||
| JPS58185431A | 1983-10-29 |