The silica gel products turn yellow after being put for a long time, or the silica gel mold turns yellow, which is a headache for the silica gel industry.Here is a simple analysis of the reasons.

  First, added vulcanizing agent.Vulcanizing agent properties are divided into common type and yellow resistance.And ordinary type not yellow vulcanizing agent, applied to some can be used for dark color or color requirements are not high non-exposed silicone products, even if the silicone yellow will not have a great impact.And the curing agent with yellow resistance is applied to the products that need to be exposed, the color is lighter and brighter, and the color requirements are higher. The anti-yellow curing agent is added, which ensures the color of the silica gel products to the greatest extent.But do not rule out the poor quality of the curing agent itself, it will make the liquid silica gel in the production of light yellow, encounter such a situation according to the requirements of the product to choose whether to replace the silica gel raw material.

  Two, the process.When transparent silica gel products are formed, different variable conditions are also the main reason for the yellow color of transparent silica gel products after molding.For example, the mold temperature is too high, vulcanization time is too long, after adding sulfur two times, etc.

  Although silica gel products have excellent weather resistance and aging resistance.But sometimes the silicone products just out of the oven are yellow.In order to avoid this situation, according to the requirements of the choice of curing agent, process to strictly control the mold temperature and curing time of the product, pay attention to the yellow resistance of raw materials and other factors are the key.