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[0032] Although these have adhesive properties, when these compositions are formed into thin coating films of several micrometers, solvent resistance, adhesiveness, and processability are poor as a result.
[0033] As mentioned above, many attempts have been made, but until now, there has been no coating film formed on the surface of the metal plate that has excellent adhesion to the surface of the metal plate, withstands severe processing such as drawing, maintains film adhesion, and is resistant to Coating film with excellent corrosion resistance and sufficiently high resistance to polar solvents or alkaline chemicals
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[0151] Hereinafter, the present invention will be specifically described using examples. First, synthesis examples of the water-based polyurethane resin (II) used in the present invention and the water-based polyurethane resin (II) using hydrogenated MDI will be specifically shown and described through synthesis examples 1 and 2.
[0152] Hereinafter, "part" means "mass part", and "%" means "mass %". Viscosity hereinafter means Gardner viscosity.
Synthetic example 1
[0154] In a reactor with a stirrer equipped with a refluxcooling pipe, a nitrogen inlet pipe, and a thermometer, 2.4 parts of polyoxyethylene glycol (Mn=600), 19.6 parts of 2,2-di(hydroxymethyl)propionic acid Parts, 34.4 parts of polyesterdiol (neopentyl glycoladipate: Mn=500), 4.4 parts of trimethylolpropane, 9.7 parts of butyl ethyl propylene glycol, 83.8 parts of Takenate 600 (manufactured by Takeda Pharmaceutical: hydrogenated XDI) Parts, 154.3 parts of methyl ethyl ketone, 0.008 parts of dibutyltin laurate, while stirring, the temperature was raised to 70°C in 0.5 hours, and the reaction was carried out at 70-75°C for 3 hours.
[0155] Next, 0.05 parts of tert-butyl hydroquinone, 44.3 parts of LIGHT-ESTER G-201P (manufactured by Kyoeisha Chemical Co., Ltd.), and 88.5 parts of MEK (methyl ethyl ketone) were added thereto, and the nitrogen inlet tube was replaced with an air inlet tube, and then the 70- It was made to react at 75 degreeC for 10 hours, adding 0.04 part of...
Synthetic example 2
[0158] 3.2 parts of polyoxyethylene glycol (Mn=600), lactonepolyesterdiol OD-X-2155 (Mn =970 Dainippon Ink Chemical Industry Co., Ltd.) 42.6 parts, 2,2-bis(dimethylol)butyric acid 21.14 parts, butyl ethyl propylene glycol 7.1 parts, castor oil LM-R (manufactured by Toyokuni Oil Co., Ltd.) 22.9 parts parts, 47.4 parts of hydrogenated XDI, 170.9 parts of methyl ethyl ketone, and 0.02 parts of stannous octoate. While stirring, the temperature was raised to 70°C in 0.5 hours, and the reaction was carried out at 70-75°C for 3 hours.
[0159] Next, 28.8 parts of hydrogenated XDI (Takenate 600) was added thereto, and reacted again at 70-75° C. for 1 hour.
[0160]Thereafter, add 0.2 parts of N-methylquinone, 40.3 parts of LIGHT-ESTER G-201P (manufactured by Kyoeisha Chemical Co., Ltd.), 0.1 part of stannous octoate, and replace the nitrogen inlet tube with an air inlet tube, and then at 70- Continue the reaction at 75°C.
[0161] It reacted for 10 hours, adding 0.04 part of tert-...
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Abstract
The present invention provides an excellent radiation curable aqueous coating composition, which is highly safe and can make the adhesion to a metal surface and the corrosion resistance compatible which have been considered to conflict with each other, particularly adhesion after severe working and solvent resistance, and particularly durability to alcohols having high polarity. The composition of the present invention contains (1) a phosphoric acid ester compound having an ethylenically unsaturated double bond, (2) an aqueous polyurethane resin having both an ethylenically unsaturated double bond and a group capable of forming a salt, and (3) colloidal silica.
Description
technical field [0001] The present invention relates to an active energy ray-curable aqueous coating composition excellent in solvent resistance and adhesion to the surface of a metal material, and an aqueous coating composition which is coated with the coating composition and has excellent adhesion to the surface of a metal material and excellent adhesion after severe processing A coating metal material having a cured coating film excellent in solvent resistance and a method for producing the same. Background technique [0002] In order to modify the surface of metal materials such as plated steel sheets, the steel sheets are treated with various coating compositions and surface treatment agents. [0003] The purpose of the treatment is to improve the anti-fingerprint mark adhesion, formability, chemical resistance, corrosion resistance, etc., and the purpose is mainly achieved by coating the surface of the steel plate with organic resin. [0004] In the case of forming af...
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