Ewende Micro silica powder has the following effects on the heat resistance of rubber:
Improvement of the thermal stability of the rubber:
– Physical barrier effect: The fine particles of micro silica powder can be evenly dispersed in the rubber matrix, forming a physical barrier structure. This structure can impede the transfer of heat, so that the internal heat of the rubber is not easy to rapid conduction when heated, thus slowing down the rise of the rubber temperature and improving the thermal stability of rubber. For example, rubber seals used in high-temperature environments can maintain their sealing performance better with the addition of micro silica powder, reducing deformation and failure caused by high temperature.
– Interaction with rubber molecules: Micro silica powder has high activity, which can have physical or chemical interaction with rubber molecules and enhance the interaction force between rubber molecular chains. This enhanced intermolecular force can improve the thermal stability of rubber, so that the rubber is not easy to break the molecular chain and degradation at high temperatures, to maintain better performance.
Enhance the anti-thermal and oxygen aging performance of rubber:
– Adsorption of free radicals: under the action of high temperature and oxygen, rubber is prone to thermo-oxidative aging and generates free radicals. Micro silica powder can adsorb these free radicals and prevent further reaction of the free radicals, thus slowing down the speed of thermo-oxidative aging of rubber. This enables the rubber to maintain good performance and service life when it is exposed to high temperatures for a long period of time.
– Reduced oxygen penetration: The addition of micro silica powder can make the structure of rubber denser and reduce the penetration of oxygen in the rubber. Reduced oxygen penetration means less contact between the rubber and oxygen, which reduces the possibility of thermo-oxidative aging of the rubber and improves the heat resistance of the rubber.
Improve the mechanical properties of rubber at high temperature:
– Enhancement of high-temperature strength: Under high-temperature conditions, the strength of rubber decreases. After adding micro silica powder, due to the interaction between micro silica powder and rubber molecules and its improvement of the rubber structure, it can improve the strength of rubber at high temperatures. For example, rubber conveyor belts with the addition of micro silica powder can still maintain a high load-bearing capacity at high temperatures and are less prone to breakage and other problems.
– Improvement of high-temperature elasticity: micro silica powder can improve the elasticity of rubber under high temperature to a certain extent. Rubber tends to lose its elasticity and become stiff under high temperature, but the addition of micro silica powder can make rubber still maintain good elasticity under high temperature, and improve the performance and reliability of rubber.
