Polyisocyanate composition, coating composition, coating film and manufacturing method therefor, and humidity-stabilization method
A polyisocyanate and isocyanurate technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of insufficient moisture stability and poor stability, and achieve excellent storage stability and moisture stability, Excellent adhesion effect
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Embodiment 1
[0192] Make the 4-neck flask equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen blowing pipe, and a dropping funnel a nitrogen atmosphere, put in 6000 g of HDI and 7.0 g of isobutanol, and keep the temperature in the reactor at 80 ° C under stirring. 2Hr. Then, 5.0 g of a solution obtained by diluting the isocyanuration catalyst trimethyl-2-methyl-2-hydroxyethylammonium hydroxide to 5% by mass with isobutanol was added to perform isocyanuration. When the NCO content of the reaction solution reached 44.6% by mass, phosphoric acid was added to stop the reaction. The increased uretdione dimer concentration in this reaction is 1.0% by mass or less. Then, the temperature was raised to 160° C. at a rate of temperature increase of 1.6° C. / minute, and kept at 160° C. for 1 hour. Then, the temperature was lowered to 40° C. at a rate of 1.5° C. / min. This heating produces uretdione groups, uretonimino groups, and isocyanurate-uretdione bonded structures. Using a t...
Embodiment 2
[0195]Make the 4-necked flask equipped with a stirrer, a thermometer, a reflux condenser, a nitrogen blowing pipe, and a dropping funnel a nitrogen atmosphere, put in 6000 g of HDI and 11.0 g of isobutanol, and keep the temperature in the reactor at 80 ° C for 2 hours while stirring. . Then, 5.0 g of a solution obtained by diluting the isocyanuration catalyst trimethyl-2-methyl-2-hydroxyethylammonium hydroxide to 5% by mass with isobutanol was added to perform isocyanuration. When the NCO content of the reaction solution reached 45.5% by mass, phosphoric acid was added to stop the reaction. The increased uretdione dimer concentration in this reaction is 1.0% by mass or less. Then, the temperature was raised to 160° C. at a rate of temperature increase of 1.6° C. / minute, and kept at 160° C. for 1 hour. Then, the temperature was lowered to 40° C. at a rate of 1.5° C. / min. This heating produces uretdione groups, uretonimino groups, and isocyanurate-uretdione bonded structures....
Embodiment 3
[0197] The temperature increase rate and temperature decrease rate of the reaction liquid after the isocyanuration reaction were changed to 2.2°C / min and 2.4°C / min, respectively. About other conditions, it carried out similarly to Example 1, and obtained the polyisocyanate composition P-3. In addition, subsequent measurement and evaluation were performed similarly to Example 1. Table 1 shows the evaluation results.
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