Silicone Mold
Silicone molds are produced crafts special mold rubber, silicone
is characterized by high temperature, corrosion resistance, tear resistance and
strong , high simulation fine , special molds for making all kinds of crafts .
Silicone mold
materials
Silicone is good for its environmental performance and more and
more people know and understand the silicone mold , let’s start form silicone
raw materials .
1 , according to the performance of raw materials, silicone can
be divided into ordinary silicone and The pure silica gel
Ordinary silica also known as precipitated silica ,
Color: translucent, milky white , pale yellow , gray and so on.
Hardness : 30 °, 40 °, 50 °, 60 °, 70 ° , commonly between 40 °
-70 °.
Density :1.1-1 .12g/cm ³
Elongation: 400%
Uses: more used on phone keypad, miscellaneous items, such as
middle and low conductive silicone rubber products .
pure silicone rubber Color: Clear .
Hardness : 30 °, 40 °, 50 °, 60 °, 70 °, 80 ° , commonly between
40 ° -60 °.
Density :1.1-1 .12 g / c ㎡
Elongation: 600% -700 %
Features : Because this material is good transparency , strong
tensile . High cost
Usage: silicone tube, protective cover and other high need high
flexibility products .
2 , according to the physical properties of silicone raw materials,
can be divided into solid silicone and liquid silicone .
Solid silicone is mainly used for molded products. For example:
silicone case , silicone utensils , silicone molds, silicone keys , etc.,
mainly used for liquid silicone extrusion products, such as silicone nipple ,
silicone tubes.
Insulation silicone pad , excellent heat capacity , silicone (
food-grade silicone ) resistant to 200 ℃ high
temperature and long-term use , the production of raw materials meet food grade
standards , through FDA food-grade test , tasteless , non-toxic , mold
manufacturers in accordance with production, color, shape can be customized .
production process
Molding form and mold parting line is very important. first, to take the easy mode , the second is
the parting line should be selected without affecting the overall effect of the
product, the third is not to affect product quality , such as mold line position
waterscape series too high , sealing materials and more time to mold line of
products prone to cracking ; fourth step is to reduce the flow of operations ,
such as opening half of the mold .
In order to prevent the flow around the silicone mold, use some
slice for blocking the certain area , no gap , oil smooth surface . After
completion of the above work to prepare , and then on the kinds of painted
plaster mold or mold release agent on Vaseline or spray , smooth product
requirements with a clean cotton cloth soaked in Vaseline evenly on the mold,
the mold for 30 minutes species to fully absorb Vaseline , and then a clean
cotton cloth to clean the surface of the mold require bright surface ; rather
have the texture of the product as long as evenly coated with Vaseline on it
will be better formulated silicone tune. When the direction of the irregular
silica gel formulation should be agitated to mix the curing agent and silicone
sufficiently minimize pumping to maintain a vacuum of the required air -0.1Mpa
within the mixed rubber , smooth product is best when the adhesive coated first
layer 7-8 seconds.
With a good silicone molding should be timely . The glue in a
way trickle down to the highest parts of the mold , let it flow , where the
flow is not in place with a painting brush in place, if it is not only full
piece molded silicone brush evenly throughout the product but also on clay .
Each item of each brush at least three silica layer thickness of silica 1mm,
the brush process silica required to brush after each additional layer of the
cured layer , the third layer when the brush is applied to the top of a second
layer layers of gauze to increase the strength of the silica gel . Entire mold
silicone products based in part on the size of the different requirements of
thickness control in 3-4mm, width no greater than the product width 60 mm.
Start silica gel solidification time was 20 minutes.
1 , clean and dry the female die, (brushing a layer of mold
release wax release agent )
2, 500-1000 grams of silicon rubber mold ( silicone molds
, rubber molds , silicone rubber , silicone ) keep well for spare ;
3
, weight certain proportion hardener (
typically 1.5-2.5 % ), put in a container, mix
and stir ;
4 , depending on the situation (especially for the first layer )
by adding a certain amount of silicone dilution. Until thoroughly mixed up , usually
3-5 minutes.
5. Silicon rubber mold ( mold silicone mold , silicone rubber ,
silicone ) and the curing agent mixture , i.e. the reaction at room temperature
, and the release of low molecular weight alcohol , the alcohol molecules from
the colloid is required under the negative pressure discharge bulbs 1-3
minutes. Also available ( depending on the tool maker’s experience ) without
the aid of equipment.
6 , multi- piece mold brushing should follow inner, middle and
outer while curing appropriate. Curing agent is relatively low, the reaction
time is lengthened , the reaction fully , like colloids , thus curing agent is
preferably within a little more than outside . When brushing until the first
layer ( inner layer ) dry and then brush a second layer . Operating time 30-50
minutes , removal time 10-15 hours. Curing time 24 hours . Note brushing first
, the best use mold cloth , which can greatly improve die life ( but must not
use the glass fiber cloth , or likely to cause mold scrap )
7 , three-dimensional perfusion mode , generally 10-15 hours
curing as well.
8 , but also of the soft mold produced coat plaster or
fiberglass to support soft silicone mold Note : 1 , analog line options: Choose
the location does not affect the appearance of the product ; selection position
after filling easy processing ; choose mold itself is easy to dismantle
location mold ; select products easily deformed position 2 , the production
schedule must not rush blindly to increase the amount of hardener , otherwise
it will greatly reduce the silicone mold life.
