METHOD FOR COATING PLASTIC MOLDING

• Main Authors: HONDA TAKUMU, WATANABE YOSHINOBU, ONO TAKAYUKI
• Format: Patent
• Language: English; Japanese
• Published: 10.08.2021
• Subjects: ADHESIVES; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; CORRECTING FLUIDS; DYES; FILLING PASTES; 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; TRANSPORTING; USE OF MATERIALS THEREFOR; WOODSTAINS

To provide a method for coating a plastic molding which enables formation of a multilayer coating film having a primer coated film having excellent sagging resistance, popping resistance, color development property, smoothness and water resistance and high adhesion to a plastic molding even when an aqueous primer coating material and an aqueous base coating material are used.SOLUTION: A method for coating a plastic molding includes a coated film formation step using an aqueous primer coating material (I) which contains (A) an aqueous polyolefin-based resin, (B) an aqueous acrylic resin, (C) a polyester resin, (D) a melamine resin, (E) a block polyisocyanate compound, (F) a diester compound and (G) an organic coloring pigment and does not substantially contain an emulsifier, and contains, with respect to 100 pts.mass of total solid contents of (A) to (F), 25-50 pts.mass of (A), 26-50 pts.mass of (B), 4-10 pts.mass of (C), 2.5-10 pts.mass of (D), 4-20 pts.mass of (E), 2.5-10 pts.mass of (F) and 5-25 pts.mass of (G).SELECTED DRAWING: None 【課題】水性プライマー塗料及び水性ベース塗料を用いても、耐タレ性、耐ワキ性、発色性、平滑性及び耐水性に優れ、かつプラスチック成形品との密着性が高いプライマー塗膜を有する複層塗膜を形成可能な、プラスチック成形品の塗装方法を提供すること。【解決手段】（Ａ）：水性ポリオレフィン系樹脂、（Ｂ）：水性アクリル系樹脂、（Ｃ）：ポリエステル樹脂、（Ｄ）：メラミン樹脂、（Ｅ）：ブロックポリイソシアネート化合物、（Ｆ）：ジエステル化合物及び（Ｇ）：有機着色顔料を含有し、乳化剤を実質的に含有せず、（Ａ）〜（Ｆ）の全固形分１００質量部に対して、（Ａ）を２５〜５０質量部、（Ｂ）を２６〜５０質量部、（Ｃ）を４〜１０質量部、（Ｄ）を２．５〜１０質量部、（Ｅ）を４〜２０質量部、（Ｆ）を２．５〜１０質量部、（Ｇ）を５〜２５質量部含む、水性プライマー塗料（Ｉ）を用いた塗膜形成工程を有する、プラスチック成形品の塗装方法。【選択図】なし