Polyisocyanate composition, aqueous coating composition, and coated substrate
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[0316] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, as long as this invention does not exceed the summary, it is not limited to the following example.
[0317] The physical properties and evaluation of the polyisocyanate compositions in Examples and Comparative Examples were measured and evaluated as follows. In addition, "part" and "%" mean "mass part" and "mass %" unless otherwise stated.
[0318]
[0319] [Property 1]
[0320] (viscosity)
[0321] The viscosity was measured at 25°C with an E-type viscometer (manufactured by Tokimec). A standard rotor (1°34' x R24) was used. The rotational speed is shown below.
[0322] (Rotating speed)
[0323] 100r.p.m. (less than 128mPa s)
[0324] 50r.p.m. (128mPa·s or more and less than 256mPa·s)
[0325] 20r.p.m. (256mPa·s or more and less than 640mPa·s)
[0326] 10r.p.m. (640mPa·s or more and less than 1,280mPa·s)
[0327] 5r.p.m. (1,280mPa·s or mor...
preparation example 1
[0397] (Production of Coating Composition X)
[0398] To the solvent described in Tables 1 to 5, p-toluenesulfonyl isocyanate (Additive TI, product name) was added so as to be 0.5 wt % relative to the solvent, and the mixture was stirred at 40° C. for 30 minutes and allowed to stand. Next, the polyisocyanate composition obtained by the Example and the comparative example was added to a solvent, and it melt|dissolved so that a solid content might become 60 mass %, and the solution of a polyisocyanate composition was prepared. Next, 60 g of an aqueous acrylic polyol dispersion (product name: Bayhydrol A2470, amount of hydroxyl groups per resin: 3.9 wt %, solid content: 45 wt %, manufactured by Covestro) and 20 g of deionized water were weighed into a container, and a propeller was used. The blade was stirred at 600 rpm for 2 minutes to prepare an aqueous acrylic polyol dilution. Each polyisocyanate solution was added so that the ratio (NCO / OH) of the molar quantity of the isocy...
preparation example 2
[0400] (Production of Coating Composition Y)
[0401] To the solvent described in Tables 1 to 5, p-toluenesulfonyl isocyanate (Additive TI, product name) was added so as to be 1.0 wt % with respect to the solvent, and the mixture was stirred at 40°C for 30 minutes and allowed to stand. Next, the polyisocyanate composition obtained by the Example and the comparative example was added to a solvent, and it melt|dissolved so that a solid content might become 60 mass %, and the solution of a polyisocyanate composition was prepared. Next, 40 g of an aqueous acrylic polyol dispersion (product name: Setaqua 6515, hydroxyl group per resin: 3.3 wt %, solid content: 45 wt %, manufactured by Allnex Resins) was weighed into a container. The molar amount of isocyanate groups in the polyisocyanate compositions obtained in the Examples and Comparative Examples was added so that the ratio (NCO / OH) of the molar amount of the isocyanate group to the molar amount of the hydroxyl group in the acry...
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