Precoated metal sheet having excellent scratch resistance and method for producing the same
A metal plate, scratch-resistant technology, applied in metal layered products, chemical instruments and methods, metal material coating processes, etc., can solve the problems of low hardness, easy to scratch, easy to attract attention, etc., to achieve scratch resistance Effects of improved damage, improved work efficiency, and improved manufacturing yield
Active Publication Date: 2012-04-11
NIPPON STEEL CORP
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AI Technical Summary
Problems solved by technology
In order to improve the processability of the coating film, there is usually a technique of making the coating film flexible by using a resin with a low glass transition temperature and a high molecular weight. However, although such a coating film has excellent processability, it has low hardness and is easy to process. Scratch subject
In addition, in recent years, high-gloss coated steel sheets have been demanded from a design point of view, but scratches tend to be noticeable on high-gloss coating films, and scratch resistance under high-gloss has become a big problem
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0064] The details of the examples are described below.
[0065] 1. Metal plate
[0066] A hot-dip galvanized steel sheet with a thickness of 0.5mm is used. Use a single-sided zinc adhesion of 45g / m 2 steel plate.
[0067] 2. Chemical conversion treatment fluid
[0068] An aqueous solution containing 5 g / l of a silane coupling agent, 1.0 g / l of water-dispersed silica, and 25 g / l of a water-based acrylic resin was prepared as a chemical conversion treatment liquid. In addition, γ-glycidoxypropyltrimethoxysilane was used as the silane coupling agent, "Snowtex-N" manufactured by Nissan Chemical Co., Ltd. was used as the particulate silica, and polyacrylic acid was used as the water-based acrylic resin.
[0069] 3. Primer paint
[0070] Melamine resin "Cymel (registered trademark) 303" manufactured by Mitsui Cytec Co., Ltd. was added to polyester resin "Viron (registered trademark) 290" (glass transition point: 72°C) manufactured by Toyobo Co., Ltd. to make it solid as a resi...
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Abstract
Provided is a precoated metal sheet wherein there is at least one layer of a coating film on a metal sheet. The precoated metal sheet has an outermost surface layer formed from a high-elasticity coating film wherein the indentation depth recovery rate a is 70% or greater. The indentation depth recovery rate is found by using a microhardness gauge to measure the load applied to an indenter and the indentation depth when the indenter is pressed under an applied load of 5 mN into the coating film at a temperature of 25 DEG C and then the load is removed (a = (DM - DE) x 100 / (DM-D0), where D0 is the indentation depth immediately after the start of application of the load to the indenter, DM is the indentation depth when the load applied to the indenter reaches 5 mN, and DE is the indentation depth immediately before the load of the indenter is completely removed). The precoated metal sheet has excellent scratch resistance.
Description
technical field [0001] The present invention relates to a surface-treated metal sheet excellent in scratch resistance. The precoated metal sheet of the present invention is a precoated metal sheet coated with a paint in advance and can be used particularly suitably for applications that presuppose forming after painting. [0002] The precoated metal sheet of the present invention can be suitably used for, for example, household appliances, building materials, civil engineering, machinery, automobiles, furniture, containers, and the like. Background technique [0003] In household appliances, building materials, automobiles, etc., precoated metal sheets coated with colored coating films are gradually being used instead of conventional post-coated products that are painted after processing. The metal plate is usually coated with a paint after chemical conversion treatment is applied to the metal plate, and is usually used after being cut and press-formed after the paint is ap...
Claims
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IPC IPC(8): B32B15/08B05D1/36B05D7/14B05D7/24B32B15/09
CPCC23C30/00B05D7/14B05D1/36B05D7/24B32B15/08
Inventor 植田浩平细川智明
Owner NIPPON STEEL CORP