Modified polycarbodiimide curing agent, preparation method and coating prepared therefrom
A polycarbodiimide and carbodiimide technology, applied in the field of coatings, can solve the problems of high construction environment requirements, release of small molecular substances, limited coating thickness, etc., to reduce VOC content and have good hydrolysis resistance. , good weather resistance effect
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Embodiment 1
[0052] The weight of each component is as follows:
[0053]
[0054] In a reactor with stirring, cooling, and heating, 500 parts of diisocyanate and 1.78 parts of catalyst were added, and the heated to 180 ° C was heated to 180 ° C under nitrogen protection, and the NCO equivalent of the intermediate product at this time is 400. Between -450g / mol; cool below 100 ° C, add 520 mibk, thoroughly stirred and dilute, adjust the temperature to 80 ° C; drop 0.2 parts of Dikuttinikyl Tin, add 566 parts of polycyclopropane diol again. After the chain is enhanced, the end is half an hour after the end; the NCO equivalent of the intermediate product is measured between 2000-2200 g / mol; adding 196 MPEG-350, after an hour, use infrared analysis to detect NCO absorption The peak, the peak to be absorbed, the reaction is completed, and the modified polycarphimide curing agent is obtained, and the cooling to room temperature is stored.
[0055] After the coating was configured, spraying was ...
Embodiment 2
[0062] The weight of each component is as follows:
[0063]
[0064] In a reactor with stirring, cooling, and heating, 500 parts of diisocyanate and 3.66 parts of catalyst 3-methyl-1-phenyl-2-phosphite-1-oxide is protected in nitrogen. The temperature was heated to 180 ° C to the reaction, and the NCO equivalent of the intermediate product was measured between 400-450 g / mol; cooled to 100 ° C or less, and then stirred and diluted, adjust the temperature to 80 ° C. 0.2 parts of dibutyltin, 0.2 parts of Dika-laurate, and then add 183 parts of the polycyclopropane diol solution to the chain, and after the end of the drop, it is half an hour; the NCO equivalent of the intermediate product at this time is 2000-2200 g / mol. Between 79.3 mPEG-350, after an hour, after an hour, the NCO absorption peak is detected by infrared analysis, and the peak to be absorbed is disappeared, and the modified polycarphimide curing agent is obtained, the reaction is completed, and the temperature is...
Embodiment 3
[0072] The weight of each component is as follows:
[0073]
[0074] In the reactor with stirring, cooling and heating, 500 parts of diisocyanate and 3.66 parts of catalyst were added, and the heated to 180 ° C was heated to 180 ° C under nitrogen protection, and the NCO equivalent of the intermediate product at this time is 400. Between -450g / mol; 50 ° C or less, add 341.6 parts of MIBK, stir well, adjust the temperature to 80 ° C; 0.2 parts of Dikutinyltin catalyst, then add 183 parts of polycyclopropane The alcohol solution is chainned, and the income is half an hour after the end of the dropwise; the NCO equivalent of the intermediate product is between 2000-2200 g / mol; add 79.3 MPEG blocks, after an hour, after an hour, use infrared analysis to detect NCO absorption The peak, the peak to be absorbed, the reaction is completed, and the modified polycarphimide curing agent is obtained, and the cooling to room temperature is stored.
[0075] After the coating was configure...
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