Benzotriazole water soluble polymer ultraviolet absorber and preparation method and application thereof
A technology of water-soluble polymer and ultraviolet absorber, which is applied in the directions of pharmaceutical formulations, cosmetic preparations, cosmetic preparations, etc. User requirements, poor water solubility and other problems, to achieve the effect of broad commercialization prospects, excellent stability, and improved water solubility
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Embodiment 1
[0075] In a 1000 milliliter there-necked flask with mechanical stirring, thermometer and condenser, add 600 milliliters of absolute ethanol, 20 grams of sodium propylene sulfonate, 1.5 grams of BDHM, and 1 gram of ammonium persulfate initiator successively, and slowly heat up to After reacting at 60-70°C for 8 hours, a large amount of white solid was precipitated. Cool down to room temperature, stir for 1 hour, and filter. The filter cake was slurried with 150 ml of absolute ethanol for 15 minutes and filtered. The filter cake was vacuum-dried to obtain a copolymer of 2(2-hydroxy-4-methacryloyloxyphenyl)2H-benzotriazole. It is a white solid powder, weighing 19.6 grams, and the yield is 87.1%. The effective UV component content is 6.2%, and the average molecular weight is 4800. R=CH in structural formula (1) 3 , a=1, b=30, n=31.
[0076] The determination method of effective UV component content in the copolymer is as follows:
[0077] 1. Draw a standard curve:
[0078] ...
Embodiment 2
[0083]In a 1000 ml three-neck flask with mechanical stirring, thermometer, and condenser, add 500 ml of absolute ethanol, 12 g of sodium p-styrene sulfonate, 8 g of BDHM, and 1 g of sodium persulfate initiator in sequence, and slowly The temperature was raised to 60-70°C for 8 hours, and a large amount of white solid was precipitated. Cool down to room temperature, stir for 1 hour, and filter. The filter cake was slurried with 150 ml of absolute ethanol for 15 minutes and filtered. The filter cake was vacuum-dried to obtain a copolymer of 2(2-hydroxy-4-methacryloyloxyphenyl)2H-benzotriazole. It is a white solid powder, weighing 15.8 grams, and the yield is 75.2%. The effective UV component content is 38%, and the average molecular weight is 4500. R=CH in structural formula (1) 3 , a=6, d=12, n=18.
Embodiment 3
[0085] In a 1000 milliliter there-necked flask with mechanical stirring, thermometer and condenser, add 600 milliliters of absolute ethanol, 20 grams of sodium propylene sulfonate, 3 grams of BDHM, and 0.1 gram of potassium persulfate initiator successively, and slowly heat up to After reacting at 65-70°C for 12 hours, a large amount of white solid was precipitated. Cool down to room temperature, stir for 1 hour, and filter. The filter cake was slurried with 150 ml of absolute ethanol for 15 minutes and filtered. The filter cake was vacuum-dried to obtain a copolymer of 2(2-hydroxy-4-methacryloyloxyphenyl)2H-benzotriazole. It is a white solid powder, weighing 22.3 grams, and the yield is 96.5%. The effective UV component content is 13%, and the average molecular weight is 61,000. R=CH in structural formula (1) 3 , a=27, b=370, n=397.
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