Why do silicone rubber products turn yellow after long use?-Iota

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News > Dynamic industry > Why do silicone rubber products turn yellow after long use?

Why do silicone rubber products turn yellow after long use?

The yellowing and fading of silicone rubber products used in daily life has become a shadow of many of our consumers. They think that silicone rubber materials will appear yellowing and fading, such as low-cost silicone rubber mobile phone cases and sports bracelets wearing silicone rubber jewelry. However, from a professional point of view, silicone rubber products will not have this phenomenon of fading and yellowing, which is only caused by different products and material manufacturers, And the more outrageous fading or color overflow is more difficult to accept, so what is the reason for the color problem?

On the whole, we can learn about the quality of the color of silicone rubber products from two aspects. On the whole, this phenomenon does not occur in all products. This kind of problem mainly comes from the materials. If the materials fail to meet the performance, the products produced by silicone rubber processing manufacturers naturally fail to meet the performance.

1、 Color glue problem

Color glue is the main material for color adjustment of silicone rubber products. The main materials are composed of toner, silicone oil, dispersant and silicone rubber raw materials. The main reason for the discoloration of silicone rubber products is that the formulation of dispersant and silicone oil in its raw materials fails to reach a certain proportion, or problems in the raw materials lead to uneven mixing of silicone rubber raw materials when adding color glue. It is also analyzed that its color powder coloring effect is not good, The color dispersion is too large, which is incompatible with the silicone rubber material, resulting in the fading problem. In a word, the color fading problem of the color glue can basically be determined as the raw material problem of the color glue.

2、 Raw material problems

Yellowing and uneven color: most of the main products are transparent or white products. Under the action of the catalyst of many white silicone rubber products or transparent products, the product yellowing and discoloration will occur due to the high processing temperature or the high ambient temperature and the influence of heat. The main reason for this phenomenon is that tetramethylammonium hydroxide as the main material in the catalyst fails to pass through the environment correctly in the mixing stage, Due to the influence of temperature, humidity and oxidation, the prepared raw materials may lose the anti yellowing effect in nature, and the product will turn yellow after passing through the catalyst. Therefore, the raw rubber formula of the material should be considered in the raw rubber production.

Usually, "vinyl resin" is a kind of silicone raw material commonly used in most rubber compounds at present, and the proportion of this material usually needs to be less than 1%. If this range is exceeded, the polyethylene silicone rubber material will be yellowing, while the common methyl vinyl silicone rubber will have vinyl silicone, Therefore, the problem is that the silicone rubber product you purchased is yellowing, which is caused by the fact that the formula of this silicone rubber raw material manufacturer is different, and the vinyl resin is more than 1% or more, resulting in yellowing.

3、 Raw material catalyst problem

In fact, if the silicone rubber is not prepared with catalyst, it will have yellowing effect. Therefore, the silicone rubber products you buy have yellowing effect achieved through processing from raw materials, and the catalyst can generally have a certain anti yellowing effect. However, it is not important to attach importance to the anti yellowing effect of each brand's catalyst commissioning formula, Because the catalyst not only needs to be prepared for the anti yellowing effect, but also needs to achieve good sulfur addition effect, odor problem and material dispersion effect. When preparing other properties, several properties cannot be controlled at the same time to achieve the best state. Therefore, the silicone rubber products you buy are likely to have good tensile toughness, but yellowing occurs over time.

4、 Caused by use

In addition to the raw materials, the yellowing and fading of silicone rubber products also depends on its scope of use and environment. If it is used in different environments for a long time, such as high temperature, oil, strong light, etc., the proportional effect of yellowing mainly depends on the material characteristics of the products.

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