What is PMMA marking paint?

PMMA resin: Methyl methacrylate (MMA) plus butyl methacrylate plus additives (such as anti-skinning agents, gloss enhancers, toughening agents, weathering-resistant agents, and more) are pre-polymerized in a reactor at 70–90°C for 2–3 hours, with 20–40% of the total amount added. After cooling and the addition of a polymerization inhibitor, a semi-transparent, viscous liquid PMMA resin is obtained. Two-component coatings produced using PMMA resin are referred to as polymethyl methacrylate resins; the abbreviated code for polymethyl methacrylate is PMMA resin (meaning that only after the MMA monomer has undergone pre-polymerization can it be called polymethyl methacrylate resin, i.e., PMMA resin). Under sealed conditions at room temperature, PMMA resin can be stored for over 3 years without any adverse effect on its performance.

PMMA marking paint: This type of marking paint uses PMMA resin as the primary film-forming component and incorporates a certain proportion of BPO during application. After undergoing a chemical reaction, it cures and dries to form a durable marking coating. In the PMMA series, the typical dosage of BPO is between 1% and 3% of the total paint weight. The curing and drying time of the chemical reaction can be manually controlled. The viscosity of this paint cannot be reduced by adding benzene-based diluents (adding benzene-based diluents will cause polymerization inhibition, rendering the paint unusable).

Two-component marking paints typically come in two formulations: the 1:1 type and the 98:2 type. On-site spraying involves separately applying the A and B components; before construction, simply add the B component to the A component and mix thoroughly. When the weights of the two components are equal, it’s referred to as the 1:1 type. Currently in China, most on-site spraying operations use the 1:1 mixing ratio. The 98:2 type is commonly used for PMMA-based, two-component colored anti-skid road surfaces. This formulation consists only of the A component, with the BPO added at the construction site to initiate and complete the curing reaction. Typically, this method relies on manual application: after adding the BPO and thoroughly mixing it in the packaging container, the mixture must be immediately poured onto the road surface and spread manually within five minutes. Any delay—even a slight one—can easily trigger an exothermic reaction, leading to ignition. At present, China does not yet have mature construction equipment specifically designed for the 98:2 spraying technique.

PMMA marking paint is not part of the same system as epoxy, polyurethane, or other similar materials; their reaction and curing mechanisms are also different. Other series have corresponding curing agents—typically liquids—and their reaction and curing times vary accordingly.

Note: For two-component epoxy and polyurethane systems, the general curing agent is liquid, and its usage ratio is fixed. It is pre-packaged at the factory, so on-site adjustments based on curing and drying times are not possible. Viscosity can be reduced by adding solvents such as xylene.

Two-component marking paints typically come in two formulations: the 1:1 type and the 98:2 type. On-site spraying involves separately applying the A and B components; before construction, simply add the B component to the A component and mix thoroughly. When the weights of the two components are equal, it’s referred to as the 1:1 type. Currently in China, most on-site spraying operations use the 1:1 mixing ratio. The 98:2 type is commonly used for PMMA-based, two-component colored anti-skid road surfaces. This formulation consists only of the A component, with the BPO added at the construction site to initiate and complete the curing reaction. Typically, this method relies on manual application: after adding the BPO and thoroughly mixing it in the packaging container, the mixture must be immediately poured onto the road surface and spread manually within five minutes. Any delay—even a slight one—can easily trigger an exothermic reaction, leading to ignition. At present, China does not yet have mature construction equipment specifically designed for the 98:2 spraying technique.

PMMA marking paint is fundamentally not part of the same system as epoxy, polyurethane, or polyurea; their reaction and curing mechanisms are also different. Other series have corresponding curing agents—typically liquid—and their reaction and curing times vary accordingly.