EPDM Anti-Vibration Rubber Composition for Low Dynamic Magnification

The patent uses EPDM rubber as the base polymer and compounds it with a specific blend of two carbon black types (carbon black A with 60-100 nm particle diameter and carbon black B with 40-50 nm particle diameter) in controlled proportions. This composite material approach creates a rubber composition that maintains the elasticity and anti-vibration properties of EPDM while the carbon black reinforcement significantly improves heat resistance, durability, and fatigue resistance under elevated temperatures.

The patent precisely controls the particle diameter ranges (60-100 nm for carbon black A, 40-50 nm for carbon black B), iodine absorption amounts, and DBP oil absorption amounts of the carbon blacks used. By optimizing these physical and chemical parameters within specific ranges, the rubber composition achieves enhanced heat resistance and durability while maintaining anti-vibration performance, directly addressing the insufficient heat resistance of conventional rubber compositions.

The patent employs two distinct types of carbon black with different particle size characteristics: carbon black A (60-100 nm) and carbon black B (40-50 nm). Each carbon black type contributes differently to the rubber's properties - the finer carbon black B provides reinforcement for strength while the slightly coarser carbon black A helps control dynamic magnification. This local differentiation of filler properties within the composite enables simultaneous achievement of high strength and low dynamic magnification.

The patent specifies precise particle diameter ranges for the two carbon black types (60-100 nm and 40-50 nm) and controls their proportions in the composition. This parameter optimization allows the rubber to achieve the desired balance between strength properties for heavy load support and low dynamic magnification for effective vibration absorption, resolving the contradiction between these two opposing requirements.

The patent divides the carbon black reinforcement into two separate components with distinct particle size ranges (carbon black A: 60-100 nm, carbon black B: 40-50 nm). This segmentation allows each carbon black type to be optimized for specific functions and enables better processing control compared to using a single carbon black type. The divided approach facilitates more manageable compounding and mixing processes while achieving the desired anti-vibration performance.

The patent defines specific particle diameter ranges and absorption characteristics for each carbon black type, which standardizes the raw materials and simplifies the manufacturing process. By specifying these parameters, the patent enables consistent processing and reduces manufacturing variability, thereby improving ease of manufacture while maintaining excellent anti-vibration properties.