Phenolic Rubber Composition for Sulfur-Free Metal Adhesion

The patent changes the chemical composition parameters of the rubber compound by incorporating specific phenolic compounds (such as gallic acid, protocatechuic acid, and their derivatives) that enable adhesion to metallic surfaces without requiring high sulfur and zinc oxide content. This parameter change allows the compound to achieve good adhesion while avoiding premature crosslinking during production, as the phenolic compounds provide an alternative adhesion mechanism that does not trigger early vulcanization.

The patent extracts the essential adhesion function from the sulfur-based crosslinking system by identifying and isolating the specific phenolic compounds that provide adhesion to metallic surfaces. By taking out this specific adhesion-providing component (phenolic compounds with particular molecular structures and functional groups), the patent achieves good adhesion performance without incorporating the sulfur-based crosslinking system that causes production constraints and premature crosslinking.

The patent introduces specific phenolic compounds as intermediary substances that mediate the adhesion between the rubber compound and metallic reinforcing elements. These phenolic compounds (including gallic acid, protocatechuic acid, and their derivatives with specific molecular weights and functional groups) act as chemical intermediaries that bond to both the rubber matrix and the metal surface, providing effective adhesion without requiring sulfur-based crosslinking systems, thus maintaining production flexibility while ensuring reliable adhesion.