Silicon rubber has excellent performance such as high and low temperature, weather resistance, and ozone resistance, and is widely used in various fields of the national economy.However, silicon rubber itself is flammable, and the fire will continue to burn when it encounters a fire, thereby limiting its application in electronics, wire and cable, automobiles, aerospace and other fields to a certain extent.
In order to expand the scope of the use of silicon rubber, the flame retardant modification of it has become one of the main research directions.The flame retardants used in the early days were the combustible flame retardants such as ten bromine dilate, chlorine chloride and other phosphoric phosphorus flame retardants.Although these flame retardants have a good flame retardant effect on silicon rubber, they will be more harmful to the environment because they will release harmful gases when burning.
At the same time, magnesium hydroxide and aluminum hydroxide are released without harmful gases when burning. The burning residue will not cause pollution to the environment. Therefore, it is increasingly widely used as an environmentally friendly flame retardant. However, magnesium hydroxide and aluminum hydroxide can only have a significant flame retardant effect only when the amount is large, and a large amount of hydrogen hydrogen oxide will cause great damage to the mechanical properties and electrical properties of silicone rubber. Surface modification of magnesium hydroxide will help increase its decentralization in silicon rubber, improve its interface compatibility with silicone rubber, so as to keep silicone rubber with flame retardability while maintaining good mechanics performance.
After adding magnesium hydroxide in silicon rubber, the extreme oxygen index increases, and it increases with the increase of magnesium hydroxide. The scattered of magnesium hydroxide hydroxide in the silicon of silicon is evenly dispersed in silicon rubber, and the aggregation particles are small. The magnesium hydroxide particles and silicon rubber are tightly combined to improve the compatibility with the silicon rubber interface.
Magnesium hydroxide will absorb a large amount of heat in the combustion area during decomposition and reduce the temperature of the burning material. At the same time, the decomposed water vapor can dilute the combustible gas, and the water vapor can also be isolated from the contact between silicon rubber and oxygen, and then play a role in flame retardant.
Magnesium hydroxide has a good flame retardant effect on silicone rubber. The flame retardant effect of silicone treatment of magnesium hydroxide is better than that of hard fatty acid treatment of magnesium hydroxide and unbound magnesium hydroxide. The damage of the electro -insulation performance and mechanical performance of the silicon rubber on silicon rubber is lower than that of the two other two. Magnesium hydroxide is a silicone rubber for flame retardants.