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METHOD OF APPLYING COATING TO PROTECT AND RENDER ANTICORROSION PROPERTIES TO IRON OBJECTS AND STEEL PIPES, AND METHOD OF MANUFACTURING A COATED STEEL PIPE
METHOD OF APPLYING COATING TO PROTECT AND RENDER ANTICORROSION PROPERTIES TO IRON OBJECTS AND STEEL PIPES, AND METHOD OF MANUFACTURING A COATED STEEL PIPE
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机译:在铁质物体和钢管上施加涂层以保护和赋予防腐蚀性能的方法以及制造涂层钢管的方法
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FIELD: protective coatings. SUBSTANCE: surface of steel pipe is covered with epoxycyanate primer composition wherein polyisocyanate and epoxypolyol amounts are such that NCO/OH ratio is 0.6-0.9. Then a polyurethane composition is sprayed by the aid of a sputter gun, said composition containing polyurethane prepolymer and a component with active hydrogen atom including a compound with active hydrogen atom and aromatic polyamine (chain extension) with equivalent ratio NH2/OH ranged from 60/40 to 100/0. Composition for outer coating is continuously sprayed onto primer layer while the pipe is axially rotated and displaced either itself or sputting gun is displaced. EFFECT: improved procedure. 2 cl, 20 tbl
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