Abstract In this study, some practical properties of methyl methacrylate (MMA)-based cold plastic traffic paints were optimized. For this purpose, in the first step, the effect of initiator, benzoyl peroxide (BPO) content on the polymerization of MMA-based traffic paints was evaluated. No-pick-up time, pendulum hardness, tensile strength and color difference (ΔEw) before and after exposure to the accelerated weathering conditions (AWC) of the samples containing various BPO wt% (0.5, 1.0, 1.5 and 2.0) were determined. In the second step, the MMA-based paint formulation was optimized using mixture experimental design (MED). The amounts of MMA resin, chlorinated paraffin wax (plasticizer) and silica fillers with different average particle sizes were considered as the variables in the paint formulations. Viscosity, reflectance, color difference (ΔEw) before and after exposure to AWC, skid resistance, and dirt pick-up property were selected as the practical properties and responses in the MED. The region of optimum paint formulations was determined using the quadratic model and selecting the desired end-use properties. The accuracy of the model was evaluated, and the results confirmed an appropriate agreement between the proposed model and experimental measurements. The results showed that the BPO initiator in low level of usage did not sufficiently affect the curing rate of the paint samples. In addition, high level of BPO led to decrease in mechanical properties of the paint, due to the presence of plasticizer and non-reacted BPO compounds within the polymeric network. The results also confirmed the MED as an operative method to optimize MMA-based pavement marking paints for purpose of balancing between skid resistance and dirt pick-up properties.

中文翻译：

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使用混合实验设计优化基于 MMA 的冷塑道路标线涂料的实用性能

摘要 本研究对甲基丙烯酸甲酯（MMA）基冷塑交通漆的一些实用性能进行了优化。为此，在第一步中，评估了引发剂、过氧化苯甲酰 (BPO) 含量对基于 MMA 的路标漆聚合的影响。测定了含有各种 BPO wt%（0.5、1.0、1.5 和 2.0）的样品在暴露于加速老化条件 (AWC) 之前和之后的无拾取时间、摆锤硬度、拉伸强度和色差 (ΔEw)。第二步，使用混合实验设计 (MED) 优化基于 MMA 的涂料配方。MMA树脂、氯化石蜡（增塑剂）和不同平均粒径的二氧化硅填料的量被认为是涂料配方中的变量。粘度、反射率、选择暴露于 AWC 前后的色差 (ΔEw)、防滑性和吸污性能作为 MED 中的实用性能和响应。使用二次模型并选择所需的最终使用特性来确定最佳涂料配方的区域。评估了模型的准确性，结果证实了所提出的模型与实验测量之间的适当一致性。结果表明，低用量的 BPO 引发剂对涂料样品的固化速度影响不大。此外，由于聚合物网络中存在增塑剂和未反应的 BPO 化合物，高含量的 BPO 会导致涂料的机械性能下降。