Method for Making Mold Silicone Filling Mold and Split Mold

- Aug 06, 2020-

 Split mold or sheet mold operation method: apply the vacuumed silica gel to paint or inject. If you are making a sheet mold or a split mold and use the brushing method, first apply a layer of release agent or release agent to the product or model you want to copy before painting, and then brush the silicone on the product (Note : Be sure to apply evenly) After waiting for 30 minutes, stick a layer of gauze or glass fiber cloth on the surface to increase the strength, and then apply a second layer of silica gel. After the silica gel is dry, make an outer mold. The outer mold can be used Materials such as plaster or resin.


The operation method of filling mold or perfusion mold: filling mold or perfusion mold is used for relatively smooth or simple products, that is, the product or model you want to copy, surround it with rubber or glass plates, and vacuum the silicone Pour directly onto the product, after the silica gel is dried and formed, take out the product and the mold is formed (Note: The infusion mold is generally made of soft silica gel, so that it is easier to demold and will not damage the product in the silicone mold) , The above is the entire process of using and operating mold silicone.

General operation method:

Shake the curing agent (Part B) before use.

A component: B component = 100:3-100:5, this ratio is calculated according to the weight of A and B components. The weight is subject to the electronic weighing result.

After the two components A and B are poured into the container, stir evenly with a stirring rod. When the color is relatively uniform, it means that it has been stirred evenly. The bottom of the container and the container wall must be scraped well to ensure that the silica gel here can be fully mixed with the curing agent. The silicone and the curing agent must be stirred evenly. If it is not evenly stirred, one part of the mold will have been cured and another part will not be cured, and the uneven curing of the silicone will affect the service life of the silicone mold and the number of mold turnovers, and even cause the mold to be scrapped. .

After the silica gel and the curing agent are evenly stirred, perform the vacuuming to remove bubbles. The vacuuming time should not be too long. Under normal circumstances, it should not exceed ten minutes. If the vacuuming time is too long, the silica gel will undergo a cross-linking reaction and become a piece. One piece cannot be painted or poured, which will cause material loss.

The container should not be filled too full during vacuuming, otherwise the silica gel will easily overflow the container during vacuuming.

Generally, when making molds for medium or large products, a layer of gauze or glass fiber cloth is usually attached during the mold making process. If it is a sheet mold, usually a glass fiber reinforced plastic or plaster outer mold for protection.

The mold can be fully cured after 4-8 hours at room temperature. Do not heat to cure. Even if you want to increase the temperature to accelerate the curing time, the temperature is not recommended to be higher than 60 degrees.

If the product prototype is a silicon-containing material such as ceramics, it is better to paint the prototype to facilitate demoulding. 

In order to achieve better results, the mold is preferably left for 24 hours before use.