Acrylic modified polyurethane as well as preparation method and application thereof
A technology of polyurethane and acrylic, applied in the field of fluorescent materials, can solve the problems of poor migration resistance and weak UV aging resistance of fluorescent color masterbatches, and achieve good UV resistance, effective UV resistance, and environmental protection requirements.
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[0045] The preparation method of compound shown in formula Ia is as follows:
[0046] Weigh 5g (18mmol) of 4-bromo-1,8-naphthalene anhydride, put it into a 250mL round bottom flask equipped with 100mL ethanol, add 4.1g (45mmol) of 2-amino-1,3-propanediol, protect it under nitrogen, and heat up to 80°C, reflux reaction for 4h, after cooling in ice water, filter, and wash the filter cake with water until the pH of the washing liquid is neutral, take the filter cake and dry it in an oven at 60°C to obtain a gray-white crude product.
[0047] Put 4.5 g of the crude product into a round-bottomed flask, add 50 mL of DMF as a solvent, add 7 mL of dimethylamine aqueous solution (concentration: 33%, 45.9 mmol), heat to 155 ° C under reflux and stir for 3 h under nitrogen atmosphere, cool to room temperature and put into ice In water, a large amount of solid precipitated and was filtered, washed with water until the filter cake had a neutral pH, the filter cake was dried in an oven at 6...
Embodiment 1
[0054]
[0055] (1) Under the condition of inert gas protection, 5mol polyadipate-1,4-butylene glycol ester diol (Mw=500~3000), 0.001mol catalyst dibutyltin dilaurate and 10.6 mol of isophorone diisocyanate is placed in a reactor with a temperature control device and a stirring device, stirred and reacted at 80°C for 2 hours, and 100 mL of solvent tetrahydrofuran is added to reduce the viscosity, and then 0.8 mol of the compound shown in formula Ia is added to the reactor and 3.6 mol of chain extender 1,4-butanediol, stirred at 80°C for 2 hours, then added 1.34 mol of hydroxyethyl acrylate end-capping agent, stirred at 80°C for at least 2 hours, to obtain fluorescent polyurethane a with terminal double bonds;
Embodiment 2
[0058]
[0059] (1) Under the condition of inert gas protection, 4mol polyadipate-1,4-butylene glycol ester diol (Mw=500~3000), 0.001mol catalyst dibutyltin dilaurate and 8.5 mol of hexamethylene diisocyanate is placed in a reactor with a temperature control device and a stirring device, stirred and reacted at 80°C for 2 hours, and 100 mL of solvent tetrahydrofuran is added to reduce the viscosity, and then 0.6 mol of the compound shown in formula Ib is added to the reactor and 2.9 mol of chain extender ethylene glycol, stirred at 80°C for 3 hours, then added 1 mol of hydroxyethyl acrylate end-capping agent, and stirred at 80°C for at least 2 hours to obtain fluorescent polyurethane b with terminal double bonds;
[0060] (2) the fluorescent polyurethane b of the terminal double bond prepared in step (1), the compound shown in 1mol formula II, 0.005mol azobisisobutyronitrile initiator are placed in the reactor with temperature control device and stirring device, Under the pr...
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