Mold silicone operation method

Room temperature vulcanized silicone rubber is divided into two types of addition molding and condensation. The raw materials and formula are made of special mold silicone. This product is sold in double packaging. Component A is the rubber material and component B is the catalyst. When formulating, the room temperature, the strength and hardness of the mold should be considered to determine the weight formulation ratio of the AB component. When the room temperature is 20-25 degrees, A: B = 100: 1.5; when the room is low (but not less than 10 degrees), increase the amount of component B 0.1-0.3 appropriately; if the room temperature is too high, decrease group B 0.1-0.3 Serving. The specific method is: determine the total amount according to the mold volume, and then weigh the A and B components accurately according to the proportion, put them in a vessel and stir evenly, and it is ready.
1. Stir the mold silica gel and curing agent evenly. The appearance of the mold silica gel is a flowing liquid. The component A is silica gel and the component B is curing agent. For example, take 100 grams of silica gel and add 2 grams of curing agent (Note: the silica gel and curing agent must be stirred evenly. The mold will have uneven curing and drying conditions, which will affect the service life of the silicone mold, the number of mold turning times, and even cause the mold to be scrapped.

2. Evacuate air bubbles. After the silica gel and the curing agent are evenly mixed, a vacuum extraction process is performed to remove air bubbles. The evacuation time should not be too long, generally not more than 10 minutes, otherwise, the silica gel curing will produce a cross-linking reaction, which can not be painted or poured, resulting in waste of materials.

3. Brushing operation process. Pour the bubbled silicone on the master mold by painting or pouring (before the mold or infusion, apply a release agent or release agent on the master mold), the brush mold must be uniform, and a layer will be adhered after 30 minutes Sand cloth or fiberglass cloth to increase the strength and tensile force of the mold; then apply a second brush, then paste a layer of gauze or fiberglass cloth, and then paint with silicone. Many times, long service life, saving costs and improving efficiency.