The yellowing and fading of silicone rubber products used in life has become a shadow of many of our consumers. We 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, etc. However, from a professional point of view, silicone rubber products will not have this fading and yellowing phenomenon, It's just caused by different products and material suppliers, and more outrageous color fading or color overflow is more difficult to accept. So what's the reason for the color problem?

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

Color glue problem:

Color glue is the main material for debugging the color 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 there are problems in the raw materials, resulting in uneven mixing of silicone rubber raw materials when adding color glue, There are also reasons to analyze that its toner coloring effect is not good, and the color dispersion is too large, which is incompatible with silicone rubber materials, resulting in the problem of fading. In a word, the problem of dyeing and fading of color glue can basically be determined to be the problem of raw materials of color glue.

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, high ambient temperature and the influence of heat, The main reason for this phenomenon is that tetramethylammonia hydroxide is the main material in the catalyst. If it fails to pass through the influence of environment, temperature, humidity and oxidation correctly in the blending stage, it is likely to cause the prepared raw materials to lose the anti yellowing effect, and the products will turn yellow after passing through the catalyst. Therefore, the raw rubber formula of the material needs to be seen in the raw rubber production.

Usually, "vinyl resin" is a kind of silicone resin raw material commonly used in most rubber compounds at present, and the proportion of this material usually needs to be less than 1%. If it exceeds this range, the polyethylene silicone rubber material will turn yellow, while the vinyl silicone resin will appear in the common methyl vinyl silicone rubber, Therefore, the problem is that the silicone rubber products you buy are yellowing, so the formula of this silicone rubber raw material manufacturer is different, and the vinyl resin is more than 1% or more, resulting in yellowing.

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 treatment from raw materials, and the catalyst can generally have a certain anti yellowing effect. However, the catalyst commissioning formula of each brand is different, and the importance of anti yellowing is not important, 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.

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 for a long time in different environments, such as high temperature, oil, strong light, etc., the proportional effect of yellowing mainly depends on the material characteristics of the products.