What is a two-component isocyanate-free polysiloxane topcoat? What are the applications of two-component isocyanate-free polysiloxane topcoat?
1. Basic definition
Two-component isocyanate-free polysiloxane topcoat is a high-performance coating based on siloxane chemistry (Si-O-Si) curing, consisting of component A (containing silicone resin) and component B (silane crosslinker or aminosilane curing agent), does not contain isocyanate (-NCO), and forms a film through a condensation reaction (such as Si-OH + Si-OR → Si-O-Si + ROH). (Typical silicone resin recommendation: SF-074)
2. Core features
✔ Environmental protection: does not contain isocyanate (NCO), avoids the hazards of free TDI/HDI, and meets low VOC requirements (such as EU REACH regulations).
✔ Weather resistance: Siloxane bond (Si-O-Si) has high bond energy, is resistant to UV aging, and has better gloss and color retention than ordinary polyurethane.
✔ High temperature resistance: long-term temperature resistance can reach **200~300℃** (short-term higher), suitable for high temperature environment.
✔ Corrosion resistance: dense siloxane network can block water vapor and salt spray, suitable for harsh corrosive environment.
✔ Two-component design: A/B packaging improves storage stability, and mixing triggers curing during construction.
Main application areas
1. Heavy corrosion protection field
Marine engineering: anti-corrosion topcoat for ship decks, offshore wind power towers, and dock steel structures.
Petrochemical equipment: chemical corrosion-resistant coatings for storage tanks, pipelines, refineries, etc.
Bridges and infrastructure: long-term protection of cross-sea bridges and elevated steel structures (replacing traditional polyurethane).
2. Industry and energy
Power facilities: weather-resistant insulation coatings for substation equipment and transmission towers.
High-temperature components: heat-resistant protection for chimneys, exhaust pipes, and industrial furnaces.
3. Transportation
Railway transportation: coating of the exterior surface of high-speed rail and subway carriages (resistant to wind and sand impact and UV).
Auto parts: high temperature paint for engine compartment parts and exhaust pipes.
4. Architecture and decoration
Landmark buildings: topcoat for steel structures of super high-rise buildings (such as the coating system of the Dubai Tower).
Curtain walls and metal decoration: provide high gloss and self-cleaning effects.