1. Enhance cross-linking effect
Forming a stable network structure: The double bonds and zinc ions in ZDMA molecules can undergo cross-linking reactions with the rubber molecules in the sidewall rubber, forming a stable three-dimensional network structure between the rubber molecular chains. This structure can effectively restrict the movement of rubber molecular chains, allowing the tire to better maintain its shape at high temperatures, reduce deformation caused by molecular chain sliding, and thus improve the dimensional stability of the tire.
Improving crosslink density: Adding ZDMA can significantly increase the crosslink density of sidewall rubber. A higher cross-linking density means that the rubber molecules are more tightly bound together and can withstand greater external forces and heat. When the tire generates heat due to friction and other factors during driving, this high cross-linking density structure can better resist thermal stress, prevent the breakage and degradation of rubber molecular chains, and extend the service life of the tire.
2. Improve thermal stability
Enhance thermal conductivity: ZDMA can be uniformly dispersed in the sidewall rubber, serving as a certain thermal conduction medium, which helps to dissipate the heat generated inside the tire faster and reduce the temperature accumulation inside the tire. This can effectively prevent the performance degradation of tires caused by local overheating and improve the overall thermal stability of tires in high temperature environments.
Inhibition of thermal oxidation reaction: Under high temperature conditions, rubber is prone to thermal oxidation reaction, leading to rubber aging, hardening and brittleness. ZDMA has certain antioxidant properties, which can capture the free radicals generated during the thermal oxidation process of rubber, terminate the chain transfer of oxidation reaction, thereby slowing down the aging rate of rubber, maintaining the flexibility and mechanical properties of tire sidewall rubber, and enabling tires to maintain good performance even in high temperature environments.
Improve hardness and strength: Due to the cross-linking effect of ZDMA, the hardness and strength of the sidewall rubber are increased. In high temperature environments, tires can still maintain sufficient rigidity to withstand the weight of the vehicle and various stresses during driving, reduce tire deformation and wear, and improve tire load-bearing capacity and durability.
Enhanced tear resistance: After adding ZDMA, the tear resistance of the sidewall rubber is significantly improved. When encountering sharp objects or uneven road surfaces at high temperatures, tires have better tear resistance, which can effectively prevent cracks and damage to the sidewall and improve tire safety.
3. Excellent processing performance
Good compatibility with rubber: ZDMA has good compatibility with common tire rubber materials such as natural rubber, styrene butadiene rubber, and butadiene rubber, and can be uniformly dispersed during rubber mixing without agglomeration or phase separation, ensuring the stability of tire production process and consistency of product quality.
Not affecting the processing technology: Adding ZDMA during tire production will not have a significant impact on the processing technology of sidewall rubber. Whether it is mixing, vulcanization, or molding processes, adding ZDMA to rubber can maintain good processing performance, strong operability, and is conducive to improving production efficiency and reducing production costs.