Dimethylsilicone oil has many outstanding characteristics, so it is widely used in various departments of industrial and agricultural production, national defense industry, scientific research and medical and health departments. Dimethyl silicone oil is divided into: high temperature vulcanized silica gel, room temperature vulcanized type. After high temperature vulcanization dimethyl silicone oil yellow how to do?


High temperature vulcanized silicone dimethyl silicone oil usually requires a second stage vulcanization to eliminate the decomposed residue in the oxide, which is further crosslinked to achieve the best physical properties of the silicone rubber. The second stage vulcanization makes the dimethyl silicone oil adhesive yellow, the transparency decreases, which directly affects the appearance of the product, and the application scope is limited to food, medical and solar photovoltaic industries.


The reasons for the yellowing of dimethylsilicone oil are also different, some think that the production of dimethylsilicone oil raw materials and additives contained trace metal elements and NO-3 caused; Some think it is caused by the decomposition of dialkyl peroxide to produce acetone, which leads to the condensation and dehydration of alpha-hydroxybutyraldehyde and the formation of conjugated compounds. It is also believed that the pH value of white carbon black affects the yellowing of silicone rubber. However, at present, the main solution to the yellowing of dimethyl silicone oil is to consider the three aspects of raw rubber, white carbon black and auxiliaries.


The following are several ways to improve the yellowing of silicone rubber:


1. Add a kind of anti-yellowing paste double 2,5 vulcanizing agent, there is a high amount of hydrogen silicone oil, promote the anti-yellowing effect of silicone rubber has been significantly improved, improve the transparency of dimethyl silicone oil, prevent the splash of vulcanizing agent.


2. Organic surfactants are added to white carbon black to control the size of secondary particles, and the yellowing degree of dimethyl silicone oil is effectively controlled under the action of composite anti-yellowing agent.


3. Add an anti-yellowing agent called pyrophosphoric acid to enhance the anti-yellowing ability of the compound without reducing the physical and mechanical properties of the compound.


Dimethylsilicone oil should be stored in a ventilated, dry warehouse to prevent direct sunlight, and should be isolated from the fire source. Dimethylsilicone oil will not be absorbed by the digestive system, no irritation to the skin, slight irritation to the cornea, but no harm. No protective measures are required during operation. We can solve the problem of dimethyl silicone oil yellowing through the above methods.