摘要:
Metal cookware coated with a multilayer system including a primer with more A12O3 and a blend of PTFE and PFA or FEP, a midcoat with less A12O3, and a topcoat with PTFE, and processes for preparing such coating systems.
摘要:
A coated metal sheet of high durability having excellent corrosion resistance, weatherability and formability, and intended mainly for use as a material for outdoor construction may have a chemically conversion treated surface, and carries thereon an undercoat layer of an organic resin paint containing a rust-inhibitive pigment, an intermediate coating layer consisting of an adhesive layer of a modified polyolefin resin and an intermediate layer of a polyolefin resin, and formed by the simultaneous T-die extrusion of those resins, and a topcoat layer of an acrylic, urethane or polyester resin paint, or a fluororesin paint. A process for manufacturing it is also disclosed.
摘要:
A method for preparing a castable amorphous fluorocarbon coating upon the surface of a substrate which includes the steps of initially depositing a film of a fluorocarbon having a thickness between about 1500 A° and 50,000 A°, and thereafter applying a second coating as a coverlay upon the initial film. Both the initial film and the castable coating consist of an amorphous fluorinated (ethylenic-cyclooxyaliphatic substituted ethylenic) copolymer having a molecular weight ranging from between about 230,000 and 500,000.
摘要:
This invention concerns an industrial procedure for the application of a polytetrafluoroethylene film on aluminium surfaces by means of mechanical-chemical bonding using a specific compound which, on one hand can adhere to a smooth aluminium surface and, on the other, being suitable for producing mechanical-chemical bonding with the P.T.F.E.
摘要:
Two methods are provided for applying and forming a protective composite coating on a metallic substrate. In the first method, the substrate is heated to a temperature between about 175° C and 275° C and a powdered coating of epoxy resin between 100 and 400 microns thick is applied to the outer surface of the heated substrate. A premixed powder coating of epoxy resin and polyolefin is applied directly onto the epoxy resin coating, forming an interlayer of interspersed domains of epoxy and polyolefin between about 100 and 400 microns in thickness. On to this, powdered polyolefin is sprayed to produce a polyolefin sheath coating for the metallic substrate between 200 and 1000 microns in thickness. In the second embodiment of the method, the interlayer is formed by spraying pure epoxy resin powder and polyolefin powder from separate sources simultaneously onto the substrate. By these methods, a metallic substrate coated with a composite epoxy/polyolefin protective coating is produced. A particular advantage of the methods results from the fact that the powders are applied in a common spray booth through which the substrate is advanced.
摘要:
This invention concerns an industrial procedure for the application of a polytetrafluoroethylene film on aluminium surfaces by means of mechanical-chemical bonding using a specific compound which, on one hand can adhere to a smooth aluminium surface and, on the other, being suitable for producing mechanical-chemical bonding with the P.T.F.E.
摘要:
L'invention concerne la composition d'une peinture dite couche barrière qui insérée dans un système multicouche joue le rôle de couche barrière qui à la fois accélère et stoppe à sa surface l'action d'un décapant chimique La couche de finition polyuréthanne 4 repose sur la couche barrière 1 qui, elle-même, adhéré à un primaire polyuréthanne ou époxydique anticorrosion 3 (fig.2a) Après décapage, la couche barrière 1 demeure et protège la couche primaire (fig.2b). Elle est ainsi prête pour recevoir un nouveau revêtement polyuréthanne de finition sans avoir dégradé le traitement anticorrosion. Le liant en principal ou secondaire de cette couche est constitué d'acétals ou butyrals polyvinyliques pouvant être réticulés ou préréticulés par un isocyanate, le taux de réticulation entre les hydroxyles de la base et les isocyanates est situé entre 5 et 150 % en mole.Cette peinture trouve application dans de nombreux domaines, et notamment dans les systèmes de peintures extérieures pour Aéronefs.