Aqueous coating substrate treating agent double as primer, surface treatment metallic material and pre-coating metallic material

Abstract

The present invention provides an aqueous coating substrate treating agent double as a primer, a surface treatment metallic material and a pre-coating metallic material. The present invention providesan aqueous coating substrate treating agent double as a primer used for pre-coating metallic material having excellent coating processing adhesiveness, corrosion resistance, chemical resistance and scratch-resistance of coins, a single coating-type pre-coating metallic material, and the like. The aqueous coating substrate treating agent double as a primer used for pre-coating metallic material contains an aqueous polyurethane resin (A), an aqueous epoxy resin (B), an organic compounds (C) and a cross linker (D), wherein according to the mass ratio of solid components, (B) / (A) is form 1 / 50 to10 / 1, (C) / [(A) + (B)] is from 1 / 300 to 1 / 1, (D) / [(A ) + (B)] is from 1 / 300 to 1 / 1, and [(A) + (B)] is 45 to 95 mass% relative to the solid components of the total solid component.

Description

technical field [0001] The present invention relates to the field of precoated metal materials used in building materials, home appliances, automobile parts, etc., which can impart excellent coating film processing adhesion, corrosion resistance, chemical resistance and property to metal materials without relying on primers. A water-based paint primer for coin scratch-resistant precoated metal materials, a surface-treated metal material obtained by using this treatment agent, and a precoated metal material obtained by forming a surface film on the treated surface. Background technique [0002] As a pre-coated metal material, various properties such as processing adhesion, corrosion resistance, chemical resistance, coin scratch resistance, and appearance of the coating film are required, so it is widely used on metal plates that have undergone surface treatment A two-coat type precoated metal material obtained by applying an undercoat film called a primer, and then applying a...

AI Technical Summary

Problems solved by technology

However, there are problems in that the antirust pigment contained in this coating composition reduces the aesthetics of the coating film, and it is impossible to impart various appearances to precoated steel sheets.

[0016] As mentioned above, each layer of coating film in the pre-coated steel sheet plays different roles. In the prior art, when studying a single coating, if there is only a primer, the appearance and stain resistance are insufficient, and if there is only an upper coating film, the processing Insufficient adhesion and corrosion resistance

Therefore, in order to achieve single-coating of precoated steel sheets that satisfies all the properties required for precoated steel sheets and simultaneously improves the above-mentioned environmental problems, it is necessary to also have processing adhesion, corrosion resistance, and coin scratch resistance. The base treatment film with primer function such as anti-corrosion, but the current situation is that the water-based paint base treatment agent that can form such a film has not been developed

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