Molded Silica Gel Production Structure

The mold silica gel generally consists of five components of a base rubber, a crosslinking agent, a catalyst, a filler, and an additive. In theory, as long as the first three components can be made into mold silica gel, but in order to obtain a certain strength, "filler" is generally necessary, and "filler" depends on the situation. Typically the gum base, crosslinker and filler are made into one component and the catalyst is used as a separate component. The ratio of the catalyst component to the main component is generally between 1% and 3%, and the speed of the gelation reaction can be adjusted by adjusting the ratio of the catalyst.

1. The silica gel and the curing agent are evenly stirred. The appearance of the mold silica gel is a flowing liquid, the component A is silica gel, and the component B is a curing agent. Example: take 100 grams of silica gel, add 2 grams of curing agent (Note: silica gel and curing agent must be stirred evenly, if not evenly stirred, the mold will appear a solidified, one piece is not cured, the silica will appear dry and solidified unevenly It will affect the service life of the silicone mold and the number of mold overturns, and even cause the mold to be scrapped.

2. Vacuuming and bubble treatment: After the silica gel and the curing agent are evenly mixed, the vacuum is exhausted, and the vacuuming time should not be too long. Under normal circumstances, do not exceed 10 minutes, and the vacuuming time is too long. Curing, resulting in cross-linking, so that the silica gel becomes a piece, can not be painted or perfused, thus wasting silica gel, can only pour silica gel into the trash can, and then take the silica gel again.

3, painting or operation process: evacuate the silica gel through the bubble, to brush or infusion. Pour on the product (Note: The product or model to be copied before pouring the silicone must be a release agent or release agent). Then apply the silica gel on the product, and the brushing must be uniform. After 30 minutes, a layer of gauze fiber weft cloth is applied to increase the strength and tension of the silica gel. Then apply a layer of silica gel and then apply a layer of gauze sliver, so that it will be done twice. Only by doing so, the service life of the silicone mold opened and the number of mold overturns are relatively increased, which can save costs and improve efficiency.

4, the production of the outer mold: the general method and materials used is to surround the mold, surrounded by rubber or wood, one can be filled with plaster to fill the mold cabinet, and the other is painted with resin, brushing A layer of resin is pasted with a layer of fiberglass cloth, then brushed and then pasted, and the mold is completed by two or three layers.

5, filling mold or perfusion mold operation method: filling mold or perfusion mold, is used for relatively smooth or simple products, no mold line saves labor and time,

6. Slitting mold or sheet mold operation method: Before painting, apply a layer of release agent or release agent to the product or model you want to copy.) After waiting for 30 minutes, attach a layer of gauze or glass to the surface. The fiber woven fabric is used to increase the strength, and then the second layer of silica gel or the like is dried, and then the outer mold is used. The outer mold can be made of a material such as gypsum or resin.