| 摘要 |
PURPOSE:To reduce the drying stage and to produce glass at a low cost by carrying out aging when glass is produced by a sol-gel method at a specified temp. CONSTITUTION:In the production of glass by a sol-gel method, ageing is carried out at >=40 deg.C. The ageing stage and the drying stage can be reduced by the above-mentioned method without decreasing the yield when a dry gel is prepared from a wet sol. Namely, the wet gel is contracted to a smaller volume than before in the ageing stage not significantly affecting the yield, and is not significantly contracted in the drying stage affecting the yield greatly to prepare the dry gel. The ageing in this case means that the wet gel is allowed to stand at a certain temp. in a closed state. The wet gel during ageing is contracted as the dehydration and condensation reactions proceed, and a solvent such as water is removed from the gel. |
