Dual luminous water-based polyurethane paint based on chromophores in hydroxyl-terminated polylactic acid and preparation method thereof
A water-based polyurethane and hydroxypolylactic acid technology, applied in the preparation of luminescent materials, luminescent coatings, organic compounds, etc., can solve the problems of small molecule migration, poor luminescence stability and durability, and increased cost, and reduce the use and distribution of organic solvents. Wide and adjustable effect with long-lasting luminous performance
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[0038] Example 1:
[0039] 1. Add 4g 4-fluorobenzophenone, 10.5g 2-methylaminoethanol and 4.14g potassium carbonate into a 250mL three-necked flask, stir with a magnetic stirrer and raise the temperature to 130°C, react for 12 hours, and cool down to complete the reaction . Add 100 mL of deionized water to the flask, stir at room temperature for 1 hour, and solids will precipitate out, and then filtered under reduced pressure to obtain a light yellow solid. The product was dried in a vacuum oven to obtain 3.22 g of a pale yellow product (4-((2-hydroxyethyl)(methyl)amino)phenyl)benzophenone (NBP) with a yield of 0.63. The product is soluble in dichloromethane, ethyl acetate and other solvents.
[0040] 2. In N 2 Under protection, add 0.3g initiator (4-((2-hydroxyethyl)(methyl)amino)phenyl) benzophenone (NBP), 29.7g D in sequence to the reaction flask equipped with a magnetic stir bar, L-lactide, 0.6g stannous octoate in n-hexane solution. The reaction flask was sealed and immers...
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[0047] Example 2:
[0048] 1. Add 5.4g 4,4-dichlorobenzophenone, 11.25g 2-methylaminoethanol and 4.44g potassium carbonate into a 250mL three-necked flask, stir with a magnetic stirrer, heat up to 130°C, and react for 12 hours , Cooling to end the reaction. After cooling to room temperature, 120 mL of deionized water was added and stirred at room temperature for 1 hour. After an oily precipitate appeared, the water layer and the oily precipitate were separated to obtain a brownish yellow oil. Use ethyl acetate: petroleum ether with a volume ratio of 2:1 as the eluent, and use a chromatography column (200-300 mesh silica gel) to separate and purify to obtain a light yellow solution; use vacuum distillation to remove the solvent to obtain a yellow powder The product was dried in a vacuum drying oven to obtain 3.40g of yellow product (4-chlorophenyl) (4-((2-hydroxyethyl)(methyl)amino) benzophenone (NBP-Cl) ), the yield is 0.55. The product can be dissolved in dichloromethane, ethy...
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[0056] Example 3:
[0057] 1. Add 6.0g of 1-(4-chlorophenyl)-3-phenylpropane-1,3-dione, 14.47g of 2-methylaminoethanol and 6.2g of potassium carbonate into a 250mL three-necked flask, stir with magnetic force The reactor was stirred and the temperature was raised to 130° C., the reaction was carried out for 12 hours, and the reaction was terminated by cooling. Add 150 mL of deionized water to the flask, stir at room temperature for 1 hour, and solids will precipitate out, and then filtered under reduced pressure to obtain a light yellow solid. The product was dried in a vacuum oven to obtain 4.13 g of a pale yellow product 1-(4-((2-hydroxyethyl)(methyl)amino)phenyl)-3-phenylpropane-1,3-dione ( HMP), the yield was 0.60. The product is soluble in dichloromethane, ethyl acetate and other solvents.
[0058] 2. In N 2 Under protection, add 0.9g initiator 1-(4-((2-hydroxyethyl)(methyl)amino)phenyl)-3-phenylpropane-1,3 to the reaction flask equipped with a magnetic stir bar. -Diketone...
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