I. vulcanizing agent. 

The properties of curing agent can be divided into common type and yellowing resistance. 

1. 

Common anti-yellow vulcanizing agent can be used in some non-exposed silicone products with dark color or low color requirements. 

two。. 

Anti-yellowing vulcanizing agent is used in products that need to be exposed, lighter and brighter, and have higher requirements for color. 

II. Process. 

During the forming of transparent silica gel products, poor control of the production process leads to the yellowing of transparent silica gel products after molding. The main problems are as follows: 

1. 

The mold temperature can not be controlled well, and the temperature is too high. 

two。. 

Vulcanization time is too long. 

3. 

Secondary desulfurization. 

Third, the quality of the raw materials themselves is not up to standard, which is too bad. 

Sometimes we add anti-yellowing vulcanizing agent to the compound, but the transparent silica gel product still looks yellow after molding, it may be that the anti-yellowing ability of the raw material is too poor, and the suggestion for the raw material with poor yellowing resistance is to change the material directly.