Weather Resistance Of Silicone Rubber

We know that silicone rubber has good high and low temperature resistance, chemical resistance, good resilience, flame retardant properties and electrical properties, today we will focus on the weather resistance of silicone rubber.

There are no unsaturated bonds in the main chain structure of silicone rubber molecules, and it is not easy to be attacked in weather and ozone environments, and the bond energy of Si)O bonds is greater than that of C)C bonds. In addition, Si)O)Si bonds affect oxygen, ozone and ultraviolet rays. It is very stable, so there is no need to add any additives, that is, it has excellent weather resistance. When corona discharge occurs in an ozone environment, rubber generally ages quickly, but has little effect on silicone rubber.

The mechanical properties of silicone rubber do not change much when exposed to ultraviolet and wind and rain for a long time. After decades of outdoor exposure test, no cracks or degradation stickiness and other aging phenomena were found.

Nano TiO2 and ZnO have strong absorption and scattering effects on ULTRAVIOLET radiation, and are excellent uv shielding agents, which can greatly improve the uv resistance and aging resistance of silicone products.When nano TiO2 and ZnO are added into the silicone rubber compound, it has obvious anti-ULTRAVIOLET radiation characteristics. The gloss of the composite material is basically unchanged under sunlight for a long time, while the silicone rubber material without nano TiO2 and ZnO treatment has long lost its luster.

Silicone rubber /EPDM blending is the most common silicone rubber blending system.EPDM is known for its good ozone resistance and weather resistance, and is known as crack-free rubber, while silicone rubber has excellent high and low temperature resistance.Therefore, the use of both can improve the weather resistance of the blend system in a wider temperature range.