Silicone rubber for High Transparency Mould and Its Application

I. Characteristics of Silicone rubber for High Transparency Mould
1. Good transparency and long aging resistance.
2. High hardness, no distortion;
3. Small shrinkage and high precision;
4. It has elasticity and good tear resistance.
II. Chemical Principles of Silica Gel for High Transparency Dies
According to the principle of organosilicon, it can be divided into condensed silica gel and processed silica gel. The biggest difference between them is the difference of curing agent and the time of high temperature and aging resistance. Additive silica gel belongs to platinum catalyst curing agent, which can resist high temperature and aging for a long time.
Application of High Transparency Condensation Mold Silicone rubber
It is widely used in the reproduction of POLYSTER, EPOXY, polyurethane moulding products, PU foaming resin decorations and crafts, antique furniture, ceramics, craft candles, gypsum crafts, European components, large-scale sculpture, cultural relics reproduction, architectural decoration, relief sculptors, imitation marble, artificial natural stone, shoe models, lamp decorations, human statues, etc. Copper imitation process, model facilities, simulation landscape and many other industries die manufacturing.
IV. Characteristic of Silica Gel for Condensation Mould
Two-component room temperature vulcanized silicone rubber has excellent fluidity, good operability, curing agent added at room temperature 2-3%, 30 minutes can be operated, 2-3 hours later will be generated, with non-deformable, high temperature, acid and alkali resistance, non-expandable elastic silica gel mold, is crafts, resin crafts, lighting, candles and other products of duplicate mold and precision mold manufacturing.
V. Use of Silicone rubber for High Transparency Addition Mold
Mainly used in precision die manufacturing, such as polyurethane, epoxy resin, forming precision die manufacturing, scale requirements of stable chemical building materials and carbon fiber composite materials and machine parts mapping, can also be used in Polystyrene (POLYSTER), epoxy resin (EPOXY) and PU foam resin ornaments and craft reproduction, and the production of artistic candles and gypsum molds, can also be used. Mold manufacturing in furniture and electronics industry has high transparency and good demoulding. It can be seen whether the filling material in the mould has defects such as bubbles or not. It can also be used to make high hardness and long service life offset heads.
VI. Characteristic of Silicone rubber for Addition Mold
Addition mold silica gel can be used for a long time in the temperature range of - 65 C - 350 C, and keep its soft and elastic properties. It has excellent electrical and chemical stability, water resistance, ozone resistance, climate aging resistance, non-corrosive, physiological inertia, non-toxic and odorless, low linear shrinkage, high transparency, good demoulding and easy operation.
VII. Application of Silicone rubber in Addition Mold
(1) Mixing
Component A (base glue) and component B (curing agent) are mixed at a weight ratio of 10:1. The mixing can be done manually or with equipment.
(2) Defoaming
The mixed compound should be defoamed before filling. When used in a small amount, it can be carried out in a vacuum dryer. Under vacuum, the volume of rubber will foam, which can increase by 4-5 times. Therefore, the volume of vessel for defoaming should be 4-5 times larger than that of rubber. After a few minutes, the colloid area will return to normal. When there is no bubble escaping from the surface (about 10 minutes), the defoaming process will be completed.
(3) Surface treatment
Liquid paraffin can be used as demoulding agent on the surface of mould or material to be poured.
(4) vulcanization and demoulding
After defoaming, the compound is cured at 120 (+5 (?) for 30 minutes, at 60-70 (?) for 2-3 hours, and at room temperature for 24 hours. The curing temperature and time can be determined according to the technological conditions.
VIII. Storage and Notice of Silicone rubber for Addition Mold
1. Products are non-dangerous goods, sealed storage, placed in a cool place, to prevent rain, sunlight exposure, storage period of half a year.
2. In the use of products, it should be forbidden to mix with the compounds of condensed silicone rubber, sulfur, phosphorus and nitrogen, otherwise, the vulcanization of rubber will be affected. If the original used condensation mold, must be cleaned with gasoline, otherwise, the surface of the mold can not be vulcanized or sticky.