Japan Shin-Etsu Silicone (Shin Etsu) Silicone Materials** and technical solutions, please click below to consult now:
Shin-Etsu silicone distributor (Shin Etsu).
SHINETSU Japan Shin-Etsu KER-2936-AB encapsulated silicone
Product name: Encapsulant KER-2936-A B
Weight: a=1kg bottle b=1kg bottle.
Storage temperature: (below 25, avoid direct sunlight).
Appearance: light yellow transparent colorless transparent.
Mixing viscosity (pa.)s）：5130
Hardness (shore d): 30 Buckling rate: 141
Silicone Knowledge:
The poor dark marks (ripples) of silicone products are a kind of poor appearance of silicone products, which is characterized by two colors or messy ripples on the surface of silicone products after molding, and the ripple distribution is disorderly.
The steps are as follows:
1. Silicone products are mixed unevenly when preparing materials, that is to say, the mixing time is too short after adding color masterbatch, resulting in the failure of color masterbatch to be completely dispersed evenly, resulting in poor dark marks (ripples) when silicone products are formed. This problem can be solved by ** raw materials.
2. The vulcanization temperature is too high, and any kind of silica gel masterbatch has its heat resistance. When the vulcanization temperature exceeds the upper limit of the masterbatch, the masterbatch will change color at high temperatures. If the temperature resistance values of several masterbatches used in silicone products are different, it may lead to discoloration of a certain masterbatch and no discoloration of a certain masterbatch, and the dark marks (ripples) of silicone products will naturally appear. The mold temperature needs to be adjusted for processing. How much has the temperature decreased? The answer is that it is not good to continue to reduce to no dark marks (ripples).
3. When the mold temperature continues to decrease, the problem of poor dark marks (ripples) of silicone products is solved, but the vulcanization of silicone products is incomplete (unfamiliar). Then basically silicone masterbatch has poor heat resistance, and generally appears on some brightly colored masterbatches, such as red, green and yellow. The heat resistance of the masterbatch of this color will be relatively poor. If it is used in combination with other masterbatches, it is easy to have dark marks (ripples) of silicone products. At this time, it is necessary to consider finding a masterbatch with a similar color and then matching it to alleviate this defect.
4. Maybe you will encounter such a situation in daily production. Obviously, the dark marks (ripples) of silicone products have never appeared when they were used before, but when a certain color is used to match the color, the dark marks (ripples) will appear badly. This is most likely because the paste is not compatible with a certain paste, resulting in poor dark marks (ripples) after the silicone product is formed. The solution is also very simple, just change the color cream.
5. The unreasonable emission of rubber material during the molding of silicone products is the most likely factor to cause bad marks (ripples) of silicone products, because the cutting of silica gel raw materials is too thick and too narrow, resulting in uneven heating levels of rubber materials, resulting in poor dark marks (corrugations) of silicone products. On the contrary, the improved method can effectively solve the problem of thinning and widening of rubber cutting specifications.
6. The storage time of the rubber material of silicone products is too long after preparation, which leads to poor fluidity of the rubber material and poor dark marks (ripples) of silicone products. In addition, if too much vulcanizing agent is added to the preparation of the material, this defect can also be caused.