Dimethyl silicone oil has many outstanding characteristics, so it is widely used in various industries such as industry and agriculture, national defense industry, scientific research, and healthcare. Dimethyl silicone oil is divided into high-temperature vulcanized silicone and room temperature vulcanized type. What should I do if dimethyl silicone oil turns yellow after high-temperature vulcanization?

High temperature vulcanized silicone dimethyl silicone oil usually requires secondary vulcanization to eliminate residual decomposition in the oxide, which further crosslinks the silicone rubber to achieve optimal physical properties. However, secondary vulcanization causes yellowing and reduced transparency of dimethyl silicone oil adhesive, which directly affects the appearance of the product. Its application scope is limited to industries such as food, medical, and solar photovoltaic.

There are different explanations for the yellowing of dimethyl silicone oil. Some believe that it is caused by trace metal elements and NO-3 in the raw materials and additives used for producing dimethyl silicone oil; Some believe that it is the decomposition of dialkyl peroxides that produces acetone, leading to α Condensation and dehydration of hydroxybutyraldehyde, resulting in the formation of conjugated compounds; Some also believe that the pH value of silica affects the yellowing of silicone rubber. But currently, the main solution to the yellowing of dimethyl silicone oil is to consider three aspects: raw rubber, white carbon black, and additives.

The following are several methods to improve yellowing of silicone rubber:

1. Add a paste like double 2,5 vulcanizing agent that is resistant to yellowing, containing a high amount of hydrogen silicone oil, to significantly improve the yellowing resistance of silicone rubber, increase the transparency of dimethyl silicone oil, and prevent splashing of the vulcanizing agent.
2. Adding organic surfactants to white carbon black to control the size of secondary particles effectively controls the yellowing degree of dimethyl silicone oil under the action of composite anti yellowing agents.
3. Add an anti yellowing agent called pyrophosphate to enhance the anti yellowing ability of the mixed rubber without reducing its physical and mechanical properties.

Dimethyl silicone oil should be stored in a well ventilated and dry warehouse to prevent direct sunlight and should be isolated from ignition sources. Dimethyl silicone oil will not be absorbed by the digestive system, has no irritation to the skin, and has slight irritation to the cornea, but is not harmful. No protective measures need to be taken during operation and use. You can solve the problem of dimethyl silicone oil yellowing through the above methods.