Preparation method of hyperbranched polyurethane acrylate and ultraviolet curing coating
A polyurethane acrylate, ultraviolet light technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of complicated preparation process, unsuitable for industrial production, difficulty in cleaning reactors, etc., to reduce side reactions and improve space Spherical structure, the effect of good space guidance
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Embodiment 1
[0042] Preparation of Hyperbranched Polyurethane Acrylic Coating with Modification Degree of 25%
[0043] Add 55 pentaerythritol, 660g 2,2-bismethylol propionic acid, 4g catalyst p-toluenesulfonic acid and 35g of the first generation hyperbranched polyester into the reaction kettle with stirring paddle, and stir under normal pressure at 140-160°C with nitrogen gas React for 2 hours, then reduce the pressure to 0.6kpa and react for 2 hours; add dimethylformamide to the reaction kettle to dissolve, cool down to 50°C, add acetone to dilute, use n-hexane to recrystallize to obtain a white viscous substance; repeatedly use acetone to dissolve, The second-generation hyperbranched polyester was obtained by n-hexane recrystallization several times and vacuum drying. The hydroxyl content of the second-generation hyperbranched polyester was determined to be 1mol / 100g through hydroxyl determination.
[0044] 50g of isophorone diisocyanate, 0.8g of polymerization inhibitor hydroquinone, ...
Embodiment 2
[0048] Preparation of Hyperbranched Polyurethane Acrylic Coatings with Modification Degree of 50%
[0049] Add 55g of pentaerythritol, 660g of 2,2-bismethylolpropionic acid, 4g of catalyst p-toluenesulfonic acid and 35g of the first-generation hyperbranched polyester into a reaction kettle with a stirring paddle, and stir with nitrogen at 140-160°C under normal pressure React for 2 hours, then reduce the pressure to 0.6kpa and react for 2 hours; add dimethylformamide to the reaction kettle to dissolve, cool down to 50°C, add acetone to dilute, use n-hexane to recrystallize to obtain a white viscous substance; repeatedly use acetone to dissolve, The second-generation hyperbranched polyester was obtained by n-hexane recrystallization several times and vacuum drying. The hydroxyl content of the second-generation hyperbranched polyester was determined to be 1mol / 100g through hydroxyl determination.
[0050] 50g of isophorone diisocyanate, 0.8g of polymerization inhibitor hydroqui...
Embodiment 3
[0054] Preparation of hyperbranched polyurethane acrylic coating with modification degree of 75%
[0055] Add 55g of pentaerythritol, 660g of 2,2-bismethylolpropionic acid, 4g of catalyst p-toluenesulfonic acid and 35g of the first-generation hyperbranched polyester into a reaction kettle with a stirring paddle, and stir with nitrogen at 140-160°C under normal pressure React for 2 hours, then reduce the pressure to 0.6kpa and react for 2 hours; add dimethylformamide to the reaction kettle to dissolve, cool down to 50°C, add acetone to dilute, use n-hexane to recrystallize to obtain a white viscous substance; repeatedly use acetone to dissolve, The second-generation hyperbranched polyester was obtained by n-hexane recrystallization several times and vacuum drying. The hydroxyl content of the second-generation hyperbranched polyester was determined to be 1mol / 100g through hydroxyl determination.
[0056] 50g of isophorone diisocyanate, 0.8g of polymerization inhibitor hydroquin...
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