Reasons for yellowing of silica gel products by common precipitation method.Silicone squeeze water bottle company

　　I still remember that the phenomenon of yellowing of silicone products has become a mark in the minds of many people. When the silicone smartphone case came out, the silicone case rushed into the market in a large area, and the transparent color, white, etc., the protective case turned yellow soon after use The phenomenon of discoloration leads people to remember that the yellowing of silicone products is an essential problem. So where is the main reason for the yellowing of silicone products? Have you really understood?

　　From the production and vulcanization process of silica gel product manufacturers, the phenomenon of product whitening generally does not occur, but in the process of raw material manufacturers, the material turns yellow. The iron ion content in silica is related to the PH value of silica and the production of silica gel. The production process is also related to the catalyst used in the production of raw rubber. Of course, the content of silica and iron in each batch is different. If it is not detected, there are certain factors whether the product will turn yellow!

　　In terms of catalyst, tetramethylammonium hydroxide is generally used as a catalyst for raw rubber. If it is not handled properly in the medium-breaking stage, it will cause the raw rubber itself to be yellowish. Take out the raw rubber from the box and compare it. understood. In addition, high vinyl raw rubber (vinyl content of more than 1%) is particularly prone to yellowing. If the amount of high vinyl raw rubber in your formula is more than others, it may happen that the mixed rubber is not transparent to others.

　　On the other hand, whether the product is used correctly in different environments during use, such as long-term exposure, use in ozone environment, storage under high temperature and other factors. Finally, it is the environmental machine problem of the raw material manufacturer. When the kneader is in use, pay attention to whether the stirring paddle has cracks and leaks and whether the cold water is too cold, resulting in condensation on the inner wall of the cylinder, which can easily lead to the yellowing of the mixed rubber, especially in summer. , pay attention to the temperature difference. There are also packings, check the packings for leaks.

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