The Investigation on the Amount of Benzoyl peroxide as Curing-agent on Mechanical Properties of Two-component Traffic Paint

In this study, the effect of benzoyl peroxide hardener percentage (0.4 -2.0 wt %) on the mechanical properties of a two-component cold plastic traffic paint was evaluated. No pick up time, weathering performance (ΔE measurementsbefore and after exposing to the accelerating conditions), tensile strength and hardness properties of methyl methacrylate (MMA) based traffic paint with various wt % hardener were evaluated. The results showed that no pick up time was increased by increasing wt % of benzoyl peroxide. However, the mechanical properties of the samples were not affected by increasing curing agent’s wt % more than the optimum amount, and the higher wt % of the hardener may have a contrary effect on the overall properties of the coating sample. This is due to the character of radical polymerization reaction curing reaction of methyl methacrylate in the presence of benzoyl peroxide as the curing agent. According to the results, the proper wt % of benzoyl peroxide for acquiring the appropriate mechanical property based on drying time and ultimate properties is about 1.2 to 1.6 wt % of paint formulation