ANTICORROSIVE COATING METHOD

• Main Authors: SHIMURA KUNIO, MATSUDA HIDEKI, OTA REMI, OTA YUKI, KATSU MINENORI
• Format: Patent
• Language: English; Japanese
• Published: 18.01.2023
• Subjects: ADHESIVES; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMICAL PAINT OR INK REMOVERS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; CORRECTING FLUIDS; DIFFUSION TREATMENT OF METALLIC MATERIAL; DYES; FILLING PASTES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; USE OF MATERIALS THEREFOR; WOODSTAINS

To provide an anticorrosive coating method which can exhibit sufficient anticorrosive property even to a rust surface placed in ultraviolet and frozen environments.SOLUTION: An anticorrosive coating method includes the steps of: coating an aqueous undercoating (I) containing an amino group-containing aqueous resin (A), an antirust agent component (B) and an epoxy group-containing resin emulsion (C) onto a surface of a metal-based base material where rust remains, drying it at normal temperature, and forming an undercoat; and coating an epoxy resin-based top coating (II) containing an epoxy resin component (D) and an amino group-containing resin onto the undercoat, drying it at normal temperature, and forming a topcoat, wherein an epoxy equivalent of the epoxy resin component (D) contained in the epoxy resin-based top coating (II) is 1,700 or less, the epoxy resin-based top coating (II) contains an organic solvent, non-volatile content concentration at the time of coating is 80 mass% or more, and dry film thickness of the formed topcoat is within a range of 0.3 mm to 6 mm.SELECTED DRAWING: None 【課題】紫外線や凍結環境下に置かれた錆面に対しても十分な防食性を発揮しうる防食塗装方法を提案する。【解決手段】アミノ基含有水性樹脂（Ａ）、防錆剤成分（Ｂ）及びエポキシ基含有樹脂エマルション（Ｃ）を含む水性下塗り塗料（Ｉ）を、錆が残存した金属系基材面に塗装し、常温乾燥させて下塗り塗膜を形成する工程、エポキシ樹脂成分（Ｄ）及びアミノ基含有樹脂を含むエポキシ樹脂系上塗り塗料（II）を前記下塗り塗膜上に塗装して常温乾燥させ、上塗り塗膜を形成する工程を含む防食塗装方法であって、エポキシ樹脂系上塗り塗料（II）に含まれるエポキシ樹脂成分（Ｄ）のエポキシ当量が１７００以下であり、エポキシ樹脂系上塗り塗料（II）が有機溶剤を含み、塗布時の不揮発分濃度が８０質量％以上であり、形成される上塗り塗膜の乾燥膜厚が０．３ｍｍ～６ｍｍの範囲内にある、防食塗装方法。【選択図】なし