PolyurethaneAcrylic topcoat
KF-PU500 Polyurethane Acrylic Topcoat
KeXin KF-PU500 polyurethane acrylic topcoat uses imported aliphatic isocyanate (HDI trimer) as the curing agent and highly weather-resistant acrylic resin as the main agent. The coating possesses excellent UV aging resistance and decorative appearance retention. As the final topcoat of a heavy-duty anti-corrosion coating system, it provides steel structures with comprehensive triple protection: weather resistance, chemical medium resistance, and decorative appearance. Xenon lamp aging 2000h ΔE<3，户外10年Gloss retention rate>70%。
ProductsOverview
Polyurethane acrylic topcoat is a professional coating product developed by KeXin New Material for the automotive coating industry. It uses imported resins and highly durable pigments, with precise color matching and excellent application performance. It is widely used in automotive OEM production lines and aftermarket repair spraying.
The products meet the standards of OEMs and the needs of the automotive aftermarket repair market, with a gloss level of over 95GU and no significant discoloration after 2000 hours of QUV weathering testing. A complete color matching system and technical support are provided.
Why choose polyurethane acrylic topcoat?
CoreAdvantages
Superior weather resistance · Like new for ten years
It uses top-grade aliphatic isocyanate (HDI trimer) as the curing agent, combined with a dual light stabilization system of highly effective ultraviolet absorbers (UVA) and hindered amine light stabilizers (HALS). Xenon lamp accelerated aging 2000h (equivalent to 10 years outdoors) color difference ΔE<3，Gloss retention rate>70%. The coating does not chalk, yellow, or lose gloss.
High-gloss decorative
High-solids acrylic resin provides excellent leveling and fullness. 20° gloss >85GU, 60° gloss >92GU. The coating surface is smooth and even, with vivid colors and a full texture. It offers any color selection from 30+ color systems such as RAL, Pantone, and national standard color cards, and supports precise computer color matching and paint formulation.
Comprehensive chemical resistance
Resistant to 93# gasoline/diesel/engine oil (no change for 24h). Resistant to 10% sulfuric acid/10% hydrochloric acid/10% sodium hydroxide/saturated sodium chloride solution (no change for 7d). Resistant to acidic pollutants such as SO₂, H₂S, NOx in industrial atmosphere. Suitable for harsh environments such as chemical plant areas, refineries, and coastal industrial areas.
Excellent physical and mechanical properties
Film flexibility ≤1mm (ISO 1519 mandrel bend without cracking). Impact resistance 50kg·cm (direct and reverse impact). Abrasion resistance (Taber CS-17)<50mg/1000转。Hardness≥H（Pencil hardness）。Coating经得起Transport吊装安装过程中的碰撞和摩擦，不易产生mechanical damage。
Wide application adaptability
Supports various application methods including high-pressure airless spraying, air spraying, roller coating, and brush coating. 5°C low-temperature curing formula adapts to construction under different climate conditions. Pot life ≥4h (25°C), providing ample working time for coating large components. Good leveling properties, not prone to brush marks and roller marks.
Environmental compliance · Green manufacturing
VOC content<420g/L，CompliesGB 30981-2020Industrial protectioncoatings有害substance限量Standard。不含铅、铬、汞等Heavy metals。passedREACH和RoHSCertifications。生产过程和Products本身均Complies国家Environmental compliance政策导向。ProvidesSGS/CTIThird-party testing报告。
TechnicalSpecifications
Basic parameters
Performance
The technical parameters above are taken from test data of the Kexin New Materials laboratory (ISO 17025 accredited); actual values may differ slightly depending on application conditions and substrate. Please contact technical support to obtain a current COA test report.
Frequently AskedFAQ
ApplicationProcess
Substrate inspection
The intermediate coat surface must be fully cured, clean and dry. Free of oil, dust, and condensation. If the intermediate coat has chalking, it must be sanded and removed. If there is local damage, the intermediate coat must be repaired by touch-up. Ambient temperature 5-40°C, relative humidity<85%。
Mixing
Strictly mix the main agent and curing agent at a 4:1 volume ratio. First stir the main agent until uniform, then slowly add the curing agent and stir for 5 min. Add an appropriate amount of PU thinner to adjust to a working viscosity of 16-20s (Ford cup No. 4). Filter through a 200-mesh screen before use. Induction time 15 min.
Basecoat spraying
High-pressure airless spraying: nozzle 0.38-0.48mm / pressure 12-18MPa. Spray 2 coats with a total dry film thickness of 50-80μm. The first coat is a mist coat for coverage (20-30μm), with a 15-20min flash-off interval. The second coat is a full wet coat (30-50μm) to establish the final gloss.
Drying and curing
At 25°C, tack-free in 2h / hard dry in 24h. At low temperature 5°C, hard dry is extended to 48h. Polyurethane curing is sensitive to moisture; avoid contact with water during application and curing. Forced drying: 60°C × 60min can accelerate curing.
Final Inspection
Final acceptance shall be carried out 7 days after curing. Test gloss (60° gloss meter), color difference (spectrophotometer), adhesion (pull-off method ≥5MPa), and film thickness (ISO 2808). Visual inspection at 100cm shall show no color difference / orange peel / particles / sagging. Provide complete test reports and warranty certificate.
ApplicationsCases
Topcoat for the exterior surface of steel bridge box girders
Polyurethane acrylic topcoat for the exterior surface of highway steel bridge box girders, high-gloss decorative long-term weather-resistant protection
Topcoat for the exterior wall of petrochemical storage tanks
Polyurethane topcoat for the exterior wall of large petrochemical storage tanks, white high reflectance reduces VOCs volatilization, energy-saving and environmentally friendly
Topcoat for steel structures of sports venues
Colored polyurethane topcoat for exposed steel structures of sports venues, a perfect combination of architectural aesthetics and anti-corrosion protection
Wind turbine tower exterior topcoat
Polyurethane topcoat for wind turbine tower exterior, all-weather outdoor weather resistance and UV aging strict protection
Port machinery topcoat
Polyurethane topcoat for large steel structures of port container quay cranes, long-term protection in coastal high salt spray environment
Airport terminal steel structure colored topcoat
Polyurethane colored topcoat for large-span steel structures of airport terminals, indoor long-term color and gloss retention decoration
Pipeline exterior topcoat anti-corrosion
Polyurethane topcoat for above-ground process pipeline exterior, comprehensive protection in industrial atmospheric environment
Railway steel bridge topcoat
Polyurethane topcoat for railway steel truss bridge exterior, professional anti-corrosion solution with vibration resistance and aging resistance
Hydraulic steel gate topcoat
Polyurethane topcoat for hydraulic engineering steel gate exterior, long-term protection in alternating dry and wet environment
Mining Equipment Topcoat Application
Polyurethane high-gloss topcoat application for the exterior surfaces of large mining equipment, providing comprehensive impact and wear protection
Commercial Building Steel Structure Topcoat
Polyurethane decorative topcoat application for steel structures in commercial complex spaces, meeting high-standard appearance quality requirements
Offshore Platform Topcoat Anti-Corrosion
Polyurethane topcoat application for the superstructure of offshore drilling platforms, withstanding harsh extreme marine environments
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Learn more→Polyurethane Acrylic Topcoat·Factory direct supply
KeXin Polyurethane Acrylic Topcoat supplied directly from the source factory. Free sample testing, on-site guidance by technical engineers, ISO-certified quality assurance.
Related articles & news
Further reading: technical articles and industry news from Kexin New Materials