Transparent silicone products will not turn yellow after a few years of normal operation, but sometimes in production, some of the transparent silicone products that have just been baked appear yellowish and seem to have changed color. Why does transparent silicone products turn yellow?
One. Vulcanizing agent
1. The performance of vulcanizing agent is divided into common type and anti-yellow property. Its application range has the following two aspects:
2. Ordinary type non-anti-yellow vulcanizing agent, used in some non-exposed silicone products which can be used for darker color or less demanding color.
3. Anti-yellow vulcanizing agent is applied to products that need to be exposed, lighter in color and more vivid, and have higher color requirements.
Two. Silicone products Process aspects
When the transparent silicone product is formed, the color of the transparent silicone product turns yellow after molding. There are mainly problems:
1. The mold temperature is too high
2. The curing time is too long,
3. After secondary sulfur addition
Three. The quality of the raw materials themselves is too bad.
Sometimes we add anti-yellow vulcanizing agent to the rubber compound, but the transparent silica gel product still looks yellowish after molding. It may be that the yellowing resistance of the raw material is too bad. Direct refueling.
Although silicone products have excellent weatherability and aging resistance. But sometimes there are still yellow and yellow silicone products that have just been released. In order to avoid this situation, it is necessary to select the vulcanizing agent according to the requirements. In the process, the temperature of the mold and the vulcanization time of the product should be strictly controlled, and the raw material should pay attention to the yellowing resistance of the raw material.
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