White carbon black is the most commonly used light color reinforcing agent in the rubber products industry. It can improve the quality of rubber products in the production of rubber products. Different types of rubber have different molecular structure and performance characteristics, so the effect of white carbon black is different. EPDM rubber and EPDM reclaimed rubber are widely used in high temperature resistant and anti-aging products. Silica itself has excellent heat resistance and aging resistance, so it is often used as a reinforcing agent in EPDM rubber. To further improve the performance of rubber products, then the role of white carbon black in EPDM rubber is only reinforcing?
1. The reinforcing effect of white carbon black in EPDM rubber compound
The reinforcing effect of white carbon black in EPDM rubber is obvious. The suitable mass of white carbon black can significantly improve the hardness, tensile strength, wear resistance and heat resistance of the rubber compound. Silica black has poor dynamic properties in EPDM rubber products and can be surface treated. Studies have shown that the improved white carbon black in the EPDM rubber compound can be comparable to the carbon black, dynamic performance, wear resistance is improved, commonly used modifiers are silane coupling agents.
2. White carbon black adjusts the EPDM vulcanization process
The white carbon black can also adjust the vulcanization rate of the EPDM rubber in the EPDM rubber compound. Taking a peroxide vulcanization system as an example, the specific surface area of white carbon black is large, and the number of hydroxyl groups is avoided, which accelerates the β-elimination reaction of cumene oxide radical generated by DCP pyrolysis, shortens the time of vulcanization, and increases the vulcanization rate. The gas phase method white carbon black has the best catalytic effect; the white carbon black can also increase the crosslink density of the rubber compound, and the precipitation method white carbon black can significantly improve the vulcanization efficiency of the rubber compound.
3. White carbon black improves the heat resistance and aging resistance of EPDM rubber
EPDM rubber has excellent resistance to high and low temperature and anti-aging properties. It is widely used in the production of various high temperature resistant, low temperature resistant and anti-aging rubber products. The white carbon black itself has excellent heat resistance and aging resistance and can be further improved. The heat aging resistance of the ethylene propylene rubber product.
Nowadays, many rubber products manufacturers use EPDM rubber products together with EPDM rubber and EPDM reclaimed rubber to achieve the purpose of ensuring quality and reducing cost. The white carbon black can improve the mechanical properties of the rubber compound and adjust the vulcanization process. To delay the aging time, the rational use of white carbon black in the rubber products containing EPDM reclaimed rubber can increase the proportion of reclaimed rubber application and reduce the production cost.