What are the processes for macroporous microsphere silica gel?

The production process of macroporous microsphere silica gel mainly includes the gel granulation process. ‌

The key to the production of macroporous microsphere silica gel lies in the gel granulation process, which involves the reaction of dilute sodium carbonate solution and dilute sulfuric acid under certain conditions to form a sol-gel solution, followed by the formation of gel particles. The shape, size and other characteristics of the gel particles depend entirely on the needs and production capacity of the user. When producing macroporous microsphere silica gel, alkaline gelation is preferred because the gel particles are larger at a time when alkaline gelation is used, and macroporous silica gel is easily formed when aggregated. This is in contrast to the silica gel that forms a fine-porous structure when acidic gelation (when the acid ratio is high).

By adjusting specific process parameters such as the acid-base ratio, concentration, temperature and gel granulation time, the pore size and structure of silica gel can be controlled, thereby affecting its physical and chemical properties.

In addition, the production process of silica gel also includes a variety of methods such as hot pressing molding, injection molding, calendering molding, drop molding and vacuum molding, which are suitable for the production of silica gel products of different shapes and uses. For example, thermoforming is suitable for making daily necessities such as silicone tableware, while injection molding is suitable for making high-precision and high-finish products such as silicone electronic accessories. The choice of these processes depends on the specific needs of the product and production conditions.