Taking the manufacturing and replication of Maitreya Buddha molds as an example, explain the manufacturing process of silicone rubber molds.

(1) Select the bottom opening as the positioning part, turn and pour gypsum into the cavity, with a height about 30mm higher than the bottom, and dig out a pit for future positioning.

(2) Apply putty. Stick a layer of rice paper on the surface of the object, and then evenly apply a 5mm thick rubber putty on its surface.

(3) Gypsum 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 piece by piece 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 thoroughly, apply parting agent to the objects and plaster mold respectively, and then close the mold.

(5) 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 are produced. During the pouring of silicone rubber, pores are formed on the molded body, so vacuum defoaming is required. Generally, it is carried out in a sealed container with a vacuum degree of 100mmHg for about 5 minutes.

(6) Inject the silicone rubber with all the bubbles removed into the cavity of the closed mold, and cure at room temperature for about 24 hours.

(7) Remove the plaster mold and cut it with a razor according to the desired parting line;

(8) Carefully peel off the silicone rubber from the object, remove the object, and then fit the silicone rubber mold with the gypsum mold as it is. The silicone rubber mold is completed

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