| Type of Polyurethane Paint<\/td> | Core Characteristics<\/td> | Suitable Steel Pipe Working Conditions<\/td> | Key Technical Points<\/td> | Expected Service Life<\/td><\/tr> |
| Aliphatic Polyurethane (HDI Type)<\/td> | Excellent weather resistance, light and color retention, UV resistance, no yellowing, and strong adhesion<\/td> | Outdoor overhead steel pipes, exposed municipal pipe networks, exposed steel pipes in coastal\/chemical industrial areas, decorative steel pipes<\/td> | Must be matched with epoxy primer, construction temperature 5-35\u2103, surface treatment reaches Sa2.5 level<\/td> | 5-10 years<\/td><\/tr> |
| Aromatic Polyurethane<\/td> | Good chemical resistance, high hardness, low cost, poor weather resistance (prone to chalking and yellowing)<\/td> | Indoor steel pipes, underground direct-buried steel pipes, concealed steel pipes in pipe galleries, inner walls of non-exposed storage tanks<\/td> | Can be matched with epoxy primer, avoid outdoor ultraviolet radiation, and need 72h curing after construction<\/td> | 5-8 years<\/td><\/tr> |
| Acrylic Polyurethane<\/td> | Balances weather resistance and constructability, fast drying, high gloss, and moderate cost performance<\/td> | Steel pipes in general outdoor environments, exposed parts of municipal pipe networks, traffic facility steel pipes<\/td> | Used in two-component ratio, completed construction within the service life, salt spray resistance \u2265 300h<\/td> | 4-6 years<\/td><\/tr> |
| Solvent-Free Polyurethane<\/td> | No VOC emissions, uniform film thickness, strong adhesion, impact resistance, and good impermeability<\/td> | Inner and outer walls of buried steel pipes, pipes transporting crude oil\/finished oil\/water<\/td> | Can be used alone as primer and topcoat, total dry film thickness \u2265 200\u03bcm, avoid construction in narrow spaces<\/td> | 10-20 years<\/td><\/tr> |
| Food-Grade Polyurethane<\/td> | Non-toxic and environmentally friendly, no harmful substances precipitated, meets hygiene standards, and has good water resistance<\/td> | Drinking water transport steel pipes, supporting steel pipes in food processing fields<\/td> | Food-grade certification report is required, no residue in surface treatment, and thorough curing after construction<\/td> | 6-8 years<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n The selection of polyurethane paint for steel pipes should focus on working conditions, give priority to matching the exposure state and corrosion level, scientifically design the supporting system, and control surface treatment and construction details to achieve the optimal balance between anti-corrosion performance and economy. <\/p>\n\n\n\n <\/p>","protected":false},"excerpt":{"rendered":" Polyurethane paint is a mainstream topcoat system for steel pipe anti-corrosion coating due to its excellent weather resistance, chemical corrosion resistance, high adhesion and mechanical properties. Its selection must strictly follow the core principles of “environment adaptation, performance matching, system compatibility, and construction feasibility”, and combine with the steel pipe’s service environment, corrosion level, operating […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"yoast_head":"\n |
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