3d printing factory teaches you how to make silicone mold
1. Disposal of mold type Polish and polish the mold type, and then apply a mold release agent. The mold release agent must be applied evenly (the mold release agent can be detergent, soapy water, petrolatum, liquid wax, etc.). Blow dry with an air gun or wipe dry with gauze. If you want to do sharding, you must choose to draw a good mold line. Remarks: The release agent is not evenly painted, which can easily lead to the release of the mold. There are some places where the complex stripe release agent cannot be painted. The release is not good, and the mold is stuck to the mold and destroys the mold.
2. Preparation of objects and materials Select the silicone rubber for the appropriate product, one mold, one electronic scale, one mixing container, one mixing knife and other objects and materials.
3. Firm molds. Fix the molds on the wooden board with glue, and then handle the molds, package molds, and split molds according to the differences in mold opening methods. If the injection molding: filling or injection molding, detailed injection molding is used to compare smooth or simple products, no mold line saves time and labor, is to copy the product or mold you want to use plastic or glass plate surrounding Get up and seal the surrounding with glue to prevent the silicone from flowing out along the crack when there is a crack in the silicone. (This is a simple entry level) Use cardboard to surround the mold release agent and pour the glue. Remarks: The rubber or glass plate must also be stripped when fighting silicone. If the split mold: fill the mold line with the following sections with oil sludge, smooth and smooth, use a knife to cut off the surrounding oil sludge, the interval mold type 25px-37.5px is better.
4. The proportion of silicone and curing agent is estimated to be the dosage of the mold. The surface of the mold silicone is an active liquid. If one piece is not cured, the silicone will show a dry and uneven state. It will affect the application life of the silicone mold and the number of mold turnovers. Component A It is silica gel, and component B is a curing agent. Weigh the required silica gel electronically, and then weigh the curing agent in a certain proportion. Normally the increase of the curing agent is 2%-3%. For example: take 100 grams of silica gel, participate in 2 grams of curing agent, glue and curing agent Stirring average, (Note: The silica gel and curing agent must stir evenly, if there is no stirring average, the mold will show a piece that has been cured and even the mold is scrapped.
5, after vacuuming and evacuating and disposing of the silica gel and the curing agent, the key is to stop evacuating and evacuating the air bubble. Under abnormal conditions, do not cross ten minutes. Vacuuming for too long, the silicone solidifies suddenly, crosslinking reaction occurs, vacuum The time should not be too long, make the silicone into a piece, helplessly stop painting or infusion, so squander the silicone, you can only pour the silicone into the trash, and then take the silicone to do it again.