Silicone mold opening process detailed tutorial

RTV silicone into silicone and high temperature vulcanized silicone, the price difference very far, mainly based on the production requirements to choose. The following describes the method of operation silicone brush mode.
Select silicone mold parting line forms selection and very important, first, to modulo convenience, two analog line should be selected without affecting the overall effect of the product, three is not affect product quality, such as water features parting line position of products too high, seal the parting line when the material to be more prone to cracking products; fourth is to reduce operating under process step, such as the opening half of the mold.
To prevent the flow around the silicone mold species or with wooden planks fixed range in a rule, when the opening piece mold with wood and sludge separated from that part of the first open, requiring between sludge and mold species no gap, smooth clay surface. After the above-mentioned preparation work completed, and then the plaster mold or mold species coated with Vaseline or sprayed on release agent, smooth product requirements with a clean cotton cloth coated with petroleum jelly evenly on the mold species, held for 30 minutes to die Species fully absorb Vaseline, then clean cotton cloth to wipe the surface of the mold species require bright surface; and have the texture of the product as long as evenly coated with Vaseline on it.
The silica gel adjusted according to the formula. Maintaining 7-8 seconds should be stirred silicone curing agent and silica mix well, to minimize the air mixed in gel, smooth product is best applied when the first layer of plastic pumping a vacuum, vacuum degree requirements -0.1Mpa.
Silica gel with a good time after molding. The glue in a way trickle down in the highest parts of the mold species, let it flow, flow not in place by painting brushes in place, if it is not only full of sheet molding silicone brush evenly throughout the product but also on clay. Each product brush at least three layers each layer silica silica thickness of 1mm, silica gel in the brush during the required curing after each layer to another layer of the brush, the brush when the third layer is to be applied to the top of a second layer layers of gauze to increase the strength of the silica gel. Silicone mold portion controls the entire size of the product according to the requirements of different thickness 3-4mm, width no greater than the product width 60 mm. Start silica gel setting time of 20 minutes.
1, the master mold dry cleaned, for smoothing (to play a layer of mold release wax or brushing release agent)
2, the liquid silicone rubber mold (silicone) such as plastic pots containing spare; the amount depending on mold size.
3, the hardener weight ratio (typically 1-5%) was weighed into a container for mixing, stir evenly (because of the hardening agent by itself, performance and temperature, it is recommended to use the silica gel supporting hardener);
4. Silicon rubber mold (silicone) mixed with hardener, namely the reaction at room temperature, and the release of low molecular weight alcohol, as the alcohol molecules from the colloid, to be ranked under negative pressure soak 1-3 minutes. Also available (depending on operating experience major visual mold Division) without the aid of equipment
5, multi-brushing piece mold, should follow the inner, middle and outer cured simultaneously appropriate. Curing agent is relatively low, the reaction time is lengthened, the reaction fully, colloid like, thus curing agent is preferably within a few more outside. Brushing until the first layer (inner layer) dry and then brush the second layer. Operation time 30-50 minutes, the removal time 10-15 hours. Curing time 24 hours. Note brushing first, after the best two-story addition with gauze as a mold, which can greatly improve the die life (but must not use glass fiber cloth, or likely to cause stratification leaving the entire mold scrapped)
6, three-dimensional perfusion mode, generally 10-15 hours curing as well.
7, but also to make plaster or fiberglass coat soft-mold produced to support the soft silicone mold
Note: 1, the parting line: Option does not affect the appearance of the product position; select a location easily processed after filling; selecting mold itself easy form removal position; select a product is not easy deformation position
2, must not be in a hurry to increase the amount of the production schedule and blind hardener, otherwise it will greatly reduce the life of the silicone mold.
Prepare - stirred vessel precipitate
· Measurement - Measurement of the second component
· Mixing - mix in a second component
· Exhaust - mixing exhaust
· The casting mold material from the highest point of the model
· Model casting - will spread the cast material is applied to the partially cured scratch the surface