Block polyisocyanate composition, one-component coating composition, coating film, and coated article
A technology of polyisocyanate and composition, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of limited use, need for heat resistance of substrates, unfavorable energy, etc., and achieve good low-temperature curing effect
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[0528] Hereinafter, although an Example demonstrates this embodiment in detail, this embodiment is not limited to these Examples.
[0529] Hereinafter, measurement of various physical properties and various evaluation methods will be described. In addition, unless otherwise stated, "part" and "%" represent "part by mass" and "% by mass", respectively.
[0530]
[0531] [Physical property 1]
[0532] (Isocyanate group (NCO) content of polyisocyanate)
[0533] About 1 g or more and 3 g or less of the polyisocyanate are accurately weighed in the Erlenmeyer flask (Wg). Next, 20 mL of toluene was added to dissolve the polyisocyanate. Next, 10 mL of a toluene solution of 2 equivalents of di-n-butylamine was added, mixed, and left to stand at room temperature for 15 minutes. Next, 70 mL of isopropanol was added and mixed. Next, this liquid is titrated into the indicator with 1 N hydrochloric acid solution (factor F). The obtained titration value was recorded as V2mL. Next, t...
Synthetic example 1
[0629] (Synthesis of polyisocyanate P-1)
[0630] A four-neck flask equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen blowing tube, and a dropping funnel was made into a nitrogen atmosphere, and HDI: 600 parts by mass and polycaprolactone triol (manufactured by Daicel Corporation, "PLACCEL303") were added. " (trade name), the average number of hydroxyl groups is 3, the number average molecular weight is 310) (hereinafter sometimes referred to as "PLC303") half of 60 parts by mass. Next, the mixture was reacted for 30 minutes under stirring at a temperature in the reactor of 80° C., and then the remaining half of the amount of PLC303 was added, and further urethanization reaction was performed for 1 hour. The temperature in the reactor was set at 70° C., tetramethylammonium hydroxide was added thereto, and when the yield reached 47% by mass, phosphoric acid was added to stop the reaction. After filtering the reaction solution, unreacted HDI was removed by ...
Synthetic example 2～4
[0632] (Synthesis of polyisocyanates P-2 to P-4)
[0633] Various polyisocyanates were synthesized by the same method as in Synthesis Example 1 except that the compositions and compounding amounts shown in Table 1 were used.
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