Liquid silicone mold making steps

Liquid silicone mold manufacturing in the mold and mold selection is very important. One is to facilitate the mold, the second is the mold line should be selected does not affect the overall effect of the product, the third is not affect the product quality, such as water features series of mold line position is too high, when the mold line to material, product cracking It is easy to appear; four is to reduce the process operation process, such as open half mold.

In order to prevent the flow of silica around the mold with wood or wood fixed in a regular range, open the mold when the wood and sludge separated by the first part of that, between the sludge and mold no gap, sludge surface smooth.
After the preparation of the above work, then in the gypsum mold or mold coated with Vaseline or spray release agent, smooth products require a clean cotton cloth stained with Vaseline evenly coated on the mold, keep the mold for 30 minutes Kind of full absorption of Vaseline, and then clean the cotton cloth to clean the surface of the mold, requiring the surface bright; and the texture of the product as long as evenly coated with Vaseline can be, according to the formula will be a good tune.
Silicone should be adjusted in the irregular direction of mixing, so that the curing agent and silica gel fully mixed, to minimize the air into the glue, the smooth product is best in the first layer of glue when pumping a vacuum, vacuum required to maintain -0.1Mpa 7-8 seconds. Liquid silicone products with a good time after the mold.
The liquid drops with the way to pour the highest part of the mold, so that the natural flow, the flow is not in place with oil brush brush in place, if it is not only filled with the entire product of the mold and the clay even brush evenly. Each product at least brush three layers of silica gel each layer of silicone thickness of 1mm, in the process of brushing the silicone, the requirements of each layer after curing to brush another layer, brush the third layer in the second layer above the plus one Layer gauze to increase the strength of silica gel. The entire part of the silicone mold according to the size of the product requirements of the thickness of the control in the 3-4mm, width is not greater than the product width of 60 mm. Silicone starts to solidify for 20 minutes.
After the preparation work is completed, the liquid silicone mold can be started and divided into eight steps:
1, the silicone mold die wash and dry, for smooth treatment (can play a layer of stripping wax or brushing again release agent);
2, 500-1000 grams of mold silicone rubber (mold silicone, mold plastic, silicone rubber, silicone) into the plastic basin spare;
3, the hardening agent by weight ratio (usually 1.5-2.5%) weighing and then added to the container for mixing, stir well;
4, depending on the situation (especially the first layer) to join a certain amount of silica gel thinner. Until the mixing even so, generally 3-5 minutes.
5, mold silicone rubber (mold silicone, mold rubber, silicone rubber, silica gel) and hardening agent mixed at room temperature that is, and the release of low molecular weight alcohol, alcohol molecules for the colloid, the need for negative pressure in the bubble 1 -3 minutes. But also do not have to rely on equipment (mainly depending on the mold experience);
6, multi-layer brushing die, should follow the inside and outside the same time curing is appropriate When the amount of curing agent is relatively small, the reaction time is lengthened, the reaction is sufficient and the colloid is good. Therefore, the amount of the curing agent is preferably less than that. Brush to be the first layer (inner) dry and then brush the second layer. Operating time 30-50 minutes, demolition time 10-15 hours. Maintenance time is 24 hours. Pay attention to brushing the first and second layer after the best, such as mold cloth, which can greatly improve the service life of the mold (but must not use glass fiber cloth, or easy to cause the whole die leaving the mold);
7, three-dimensional perfusion mode, generally 10-15 hours curing as well.
8, soft mold production is completed after the production of gypsum or glass fiber reinforced plastic jacket to support the silicone soft mold
note:
1, the mold line selection: select the position does not affect the appearance of the product; select the grouting in the post-processing position; select the mold itself is easy to demolition of the mold position; select the product is not easy to deformation position
2, must not catch the progress of production and blindly increase the amount of hardener, or will greatly reduce the life of silicone mold.