Water dispersible hyperbranched polyisocyanate and preparation method thereof
A polyisocyanate and hyperbranched polyester technology, applied in the field of water-based curing agents, can solve the problems of hindering the popularization and application of water-based coatings and adhesives, and high cost of raw materials, and achieve the advantages of improving physical and chemical properties, reducing curing time, and reducing phase separation. Effect
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Embodiment 1
[0018] 1) Synthesis of hyperbranched polyester
[0019] Add 150g of dipentaerythritol and 40g of xylene in a four-necked flask equipped with a reflux condenser, stirrer, water separator, thermometer, and nitrogen protection, heat to reflux for dehydration, and then add 2660g of dimethylolpropane in batches acid and a small amount of p-toluenesulfonic acid as a catalyst, and react under reflux for 6-7 hours. When no more water distills out of the water separator, gradually increase the reaction temperature to 150-165 ° C, and further deepen the reaction by vacuuming for 1-2 hours. And remove remaining dimethylbenzene, obtain pale yellow hyperbranched polyester, the acid value of product is lower than 20mgKOH / g.
[0020] 2) Synthesis of hyperbranched polyisocyanate
[0021] Under nitrogen protection, 300g hyperbranched polyester and 75g propylene glycol methyl ether acetate (PMA solution) were added in the four-necked flask equipped with stirrer, reflux condenser, thermometer a...
Embodiment 2
[0025] 1) Synthesis of hyperbranched polyester
[0026] Add 150g of ditrimethylolpropane and 40g of xylene into a four-necked flask equipped with a reflux condenser, stirrer, water separator, thermometer, and nitrogen protection, heat to reflux for dehydration, and then add 2000g of di Methylolpropionic acid and a small amount of p-toluenesulfonic acid are used as catalysts, react under reflux for 6-7 hours, when no more water distills out of the water separator, gradually increase the reaction temperature to 150-165°C, and further deepen the reaction by vacuuming 1-2h, and remove the remaining xylene to obtain light yellow hyperbranched polyester, the acid value of the product is lower than 20mgKOH / g.
[0027] 2) Synthesis of hyperbranched polyisocyanate
[0028] Under nitrogen protection, 300g hyperbranched polyester and 75g4-methyl-2-pentanone are added in the four-necked flask equipped with agitator, reflux condenser, thermometer and dropping funnel, and the four-necked f...
Embodiment 3
[0032] 1) Synthesis of hyperbranched polyester
[0033] Add 150g of trimethylolpropane and 40g of xylene into a four-necked flask equipped with a reflux condenser, stirrer, water separator, thermometer, and nitrogen protection, heat to reflux for dehydration, and then add 1350g of dihydroxy Methylpropionic acid and a small amount of p-toluenesulfonic acid are used as catalysts to react under reflux for 6-7 hours. When there is no more water distilling out of the water separator, gradually increase the reaction temperature to 150-165°C, and further deepen the reaction by vacuuming 1 ~2h, and remove the remaining xylene to obtain light yellow hyperbranched polyester, the acid value of the product is lower than 20mgKOH / g.
[0034] 2) Synthesis of hyperbranched polyisocyanate
[0035] Under nitrogen protection, add 300g hyperbranched polyester and 75g propylene glycol diacetate into a four-necked flask equipped with a stirrer, reflux condenser, thermometer and dropping funnel, an...
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