Introduction to the process flow of silicone rubber mold making

Mold silicone rubber is the main material specifically used for mold manufacturing. Taking the manufacturing and replication of Maitreya Buddha molds as an example, explain the manufacturing process of rubber molds. Let's take a look at the process:

1. Select the bottom opening as the positioning part, turn around and fill the cavity with gypsum, with a height of about 30mm higher than the bottom, and excavate a pit for future positioning.
2. Apply putty. Apply a layer of rice paper on the surface of the utensil, and then evenly apply a 5mm thick rubber putty on its surface.
3. Plaster modeling. To support and fix the RTV mold and prevent its elastic deformation, a gypsum template is first made outside the mud layer. Make gypsum statues one by one according to their approximate parting surface, paying attention to the positioning between the gypsum molds. The gypsum slurry is gypsum: water=1:1.
4. RTV molding mold production. Start the plaster in reverse order of production, remove the plaster, clean it up, apply parting agent to the utensils and plaster mold respectively, and then close the mold. At the same time, weigh the RTV components in proportion and mix thoroughly before stirring. Due to the reaction between RTV and ethyl orthosilicate under the action of promoter organotin during the stirring process, low molecular weight alcohols will be generated. During the pouring of silicone rubber, pores will be formed on the molding mold, so it is necessary to depressurize and defoaming. One strand will be carried out in a sealed container with a vacuum degree of 100mmHg for about 5 minutes.
5. Inject the silicone rubber with all the bubbles removed into the mold cavity and cure at room temperature for about 24 hours.
6. Remove the gypsum profile, cut it with a razor according to the desired parting line, carefully peel off the silicone rubber from the object, remove the object, and then fit the silicone rubber mold with the gypsum profile as it is. The silicone rubber mold is completed.