Revestimentos para Pisos Produtos Químicos

Self-leveling epoxy flooring uses liquid bisphenol A epoxy (EEW 180–195) or bisphenol F epoxy (lower viscosity for better flow) cured with cycloaliphatic amines or amine adducts for fast return-to-service. High-build systems at 2–3 mm use mineral-filled mortar bases for traffic resistance. Reactive diluents reduce viscosity without sacrificing chemical resistance.

Epoxy floors offer excellent chemical resistance, compressive strength, and adhesion to concrete — preferred in chemical plants and food processing. Polyurethane (PU) floor coatings have superior UV stability (non-yellowing) and impact/abrasion resistance, making them better suited for car showrooms, sports halls, and outdoor parking decks.

Reactive diluents (monofunctional glycidyl ethers such as C12-C14 or phenyl glycidyl ether) reduce mix viscosity while participating in the cure reaction. Fumed silica acts as an anti-sag agent for wall coatings and mortar systems. Polyether-modified silicone additives improve leveling and surface quality in self-leveling systems.

Concrete must be mechanically prepared by shot blasting or diamond grinding to ICRI CSP 2–4 profile, depending on system thickness. The substrate must be free of laitance and contamination, with moisture content < 4% (CM test) or RH < 75% (ASTM F2170). Cracks are filled with epoxy mortar; coves are formed at wall junctions. Primer must be applied within 24 h of preparation to prevent recontamination.

ESD-control floor coatings incorporate conductive carbon black, carbon fiber, or specialized conductive metal oxides at 1–10% loading to achieve surface resistance of 10⁵–10⁹ Ω. A copper-foil grounding network under the topcoat connects to building ground. Performance is verified by ANSI/ESD STM7.1 (surface resistance) and STM97.1 (walking-body voltage) — typical specifications for cleanroom and electronics manufacturing floors.

Standard 2K epoxy floor coatings have a pot life of 30–45 min at 25°C in a 5 kg pail (lower at higher temperature due to exothermic reaction). Self-leveling formulations are designed for 60–90 min open time on the floor before flow ceases. Fast-cure systems (cycloaliphatic amine accelerators) shorten pot life to 15–20 min — used for rapid-return-to-service projects. Working time is roughly half of pot life on the floor.