Introduction: Apply aviation coatings well on the ground-the ultimate requirement for flying in the sky for 20 years
A Boeing 737–the total area of skin coating>500m2–the total coating weight>100kg(light–quantified–=–saving–oil aviation coating for each–gram—calculated–compared). At an altitude of 10,000 meters, the aircraft faces: low temperatures of-55 ° C (the coating does not crack-flexibility>50% elongation), exposure to the ground at +70 ° C (the coating does not soften–Tg>80°C), strong UV(thin ozone layer–the UV intensity is>5 times that of the ground–the topcoat QUV>3000h), hydraulic oil (Skydrol/phosphate ester–extremely corrosive-the coating does not get bitten off) and cabin fire protection (FAR 25.853-Low smoke/low toxicity/low heat release-the coating does not become a source of toxic gas in a fire). 8221; Aviation coatings–=–coatings–industry–medium performance–requirements–most–extreme—sub-branch.
The aviation coating system is divided into aircraft exterior (skin) coatings (epoxy primer–anti-corrosion + adhesion/strontium chromate anti-corrosion pigments–>PU topcoat–weather resistant/Skydrol hydraulic oil resistant/UV resistant/flexible) and cabin interior coatings (water-based/low VOC–meets FAR 25.853 Low Smoke/Low Heat Release-Passenger Safety). Core challenge: Under extreme temperature cycles of-55 to +70 ° C-where there is no peeling between the coating/aluminum skin due to CTE mismatch (aluminum ≈23×10/°C–coating ≈50-80)-adhesion remains>8MPa.
FAQ
Q1: Skydrol Hydraulic Oil-Why is it a corrosive agent for ordinary coatings? How can aviation coatings resist it? Skydrol(tributyl phosphate-phosphate hydraulic oil corrosion-extremely-strong)–contains–P=O–radical–the group can–dissolve–expand–and-degrade–ordinary–PU–coating–layer (permeate–into-coating–> from–inside–dissolve–swell–> rubber–skin–swell–peel-drop). Aviation–Grade–PU topcoat–Use–Special–HDI–Trimer–+-High–Crosslinking–Density Chemical–Inert Formulation 24h–Room Temperature–Soak–Skydrol–Δ-Weight–<2%–Δ-Hardness–<10%"Skydrol–Test–=-Aviation–Paint–Chemical–Resistance–Final–Extreme-Test–Test".
Q2: Cabin interior-Why is low smoke–low toxicity–safety of coatings–red line? F–AR–25.8–5–3–(U.S. -Federal–Federal–Aviation-Regulations) Cabin–Material Vertical–Burning-(60–s–fire–flame)–→–self–extinguishing–time–space–obscuring—sight–=–passenger–unable to find–export poison—>-HCN–/-CO–Inhalation–>-Passenger–faint–confused—=-Death Aviation–Interior–Paint–must–be water-based–/-P–U–D (No–have–machine–solvent–agent–=–fire–medium–separation–solution–product–=–main–yes–CO–2–+-water–steaming-steam) Smoke–toxic-far–lower–solvent–type This–is not-environmentally friendly–is-flight-safe.
summary
Aviation coatings-skin (PU topcoat/Skydrol resistance/UV/CTE matching)+ cabin interior (water-based/low-smoke/FAR 25.853)-the ultimate performance branch of the coatings industry. Kexin New Materials provides aviation paint selection consultation and performance testing support.