How to improve the transparency of the button compound?

The transparency of the button compound is directly related to the transparency of the silica, and a white silica with better transparency can be used.

In the formulation and process, the transparency of the rubber is not good, indicating that the hydroxyl treatment on the surface of the silica is not completely complete, which affects the transparency of the rubber, that is, the hydroxyl silicone oil we added, the hydroxyl treatment on the surface of the silica. It is not enough, indicating that there are some pseudo-hydroxyl groups in the hydroxy silicone oil, some of the substances that are not involved in the reaction are removed during vacuuming or heat treatment, and the incomplete or combined time of binding of the white carbon black molecules and the raw rubber molecules is also indicated. Not enough, it can be adjusted from the process, using raw rubber and white carbon black to mix at room temperature. The formula uses hydroxy silicone oil and alkoxysilane to treat the surface hydroxyl of white carbon black, and maintain it at 30~40°C for 8 hours. Left and right, then vacuuming, so that the transparency of the rubber will be improved. At the same time, the button glue, in addition to the physical properties in the detection, but also to control the button force and fatigue life, we can use the instrument to test, the index is controlled within a certain range.