Surface-treated metal plate
A surface treatment and metal plate technology, which is applied in the direction of metal layered products, metal material coating process, coating, etc., can solve the problems of poor adhesion of coating film, white rust, sag, etc., and achieve excellent coating performance and pull Excellent effect of deep processing
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[0100] (2) Preparation of aqueous resin dispersion and formation method of resin coating
[0101] In the production of the surface-treated metal sheet (resin film) of the present invention, an aqueous resin dispersion obtained by dispersing the above-mentioned resin composition for film formation in water or a solvent containing water as a main component is used. In the aqueous resin dispersion used in the present invention, in order to improve the formability of the resin coating film and the physical properties of the obtained film, a dilution solvent, an anti-skinning agent, and a leveling agent may be contained within a range that does not hinder the purpose of the present invention. , Defoamers, penetrants, emulsifiers, film-forming aids, coloring pigments, tackifiers and lubricants, etc.
[0102] The preparation method of the resin dispersion is not particularly limited, and it can be achieved by blending silica particles, a silane coupling agent, and a crosslinking agent an...
Example Embodiment
[0111] [Example]
[0112] Hereinafter, the present invention will be described in detail through examples, but the present invention is not limited to the following examples, and changes and embodiments that do not depart from the scope of the present invention are included in the scope of the present invention. The evaluation methods used in the examples are as follows.
[0113] (1) Corrosion resistance
[0114] The obtained surface-treated metal sheet (resin-coated steel sheet) was subjected to the salt spray test of the edge-sealed flat sheet in accordance with JIS-Z2371 (11.1 neutral salt spray test), and the amount of white rust produced was evaluated according to the following evaluation criteria Time at 5% of the area of the flat sheet.
[0115] (evaluation standard)
[0116] ◎: White rust has been generated for more than 240 hours
[0117] ○: White rust is generated for more than 120 hours to less than 240 hours
[0118] △: White rust is generated for more than 72 hours ...
Example Embodiment
[0158] Production Example 1 Preparation of acrylic urethane-based resin aqueous dispersion (H-MDI-based urethane acrylic resin)
[0159] In a pressurized synthesizer with a stirrer, heating heater, thermometer, and temperature controller with an inner volume of 1.0 kg, 24.3 g of dimer acid, trimethylolpropane and diethyl are charged as the polyol component. Polyester polyol formed of diol ("TA22-636", manufactured by Hitachi Chemical Polymers Co., Ltd.), 3.89g 1,4-cyclohexanedimethanol, 22.52g dimethylolpropionic acid, 8.82g dihydroxyacetone ( Merck Ltd. (manufactured by JAPAN), a reaction solvent 96.01 mixed with 370.01 g of butyl acrylate, 370.01 g of n-butyl methacrylate, 13.32 g of diacetone acrylamide, 13.32 g of methyl ethyl ketone, and 1.51 g of p-hydroxyanisole was added. g, stir to make the whole system uniformly dispersed.
[0160] Then, after adjusting the mixed solution of the above-mentioned polyol and acrylic monomer to 20°C, 128.81g of dicyclohexylmethane-4,4'-diiso...
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