Preparation method of ultraviolet screening agent
A technology of shielding agent and ultraviolet light, applied in the field of preparation of ultraviolet shielding agent, can solve the problems of high cost, easy to be degraded by free radicals, poor thermal stability, etc., and achieve the effect of improving compatibility and good catalytic effect.
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example 1
[0019] First, mix tetrabutyl titanate and 80% ethanol solution with a mass fraction of 1:3, and then adjust the pH to 2.5 with a 15% acetic acid solution at 40°C under heating in a water bath. After the dropwise addition is completed, After heat preservation and stirring for 3 hours, the mixed sol was prepared by standing and aging for 7 days; the mixed sol was placed in a muffle furnace at 130°C, and after heat preservation and preheating for 15 minutes, the temperature was raised to 250°C at 2°C / min, and after heat preservation and calcination for 3 hours , stand to cool to room temperature, get the calcined product and place it in a ball mill jar, ball mill it at 300r / min for 5h, and pass through a 150 mesh sieve to prepare nano-titanium dioxide powder; weigh 50 parts of deionized water respectively in parts by weight , 25 parts of tetrapropylammonium hydroxide, and 25 parts of ethyl orthosilicate were placed in a beaker, stirred and mixed at room temperature for 24 hours, t...
example 2
[0022]First, mix tetrabutyl titanate and 80% ethanol solution with a mass fraction of 1:3, and then adjust the pH to 2.0 with a 15% acetic acid solution under heating in a water bath at 35°C. After the dropwise addition is completed, After heat preservation and stirring for 2 hours, the mixed sol was prepared by standing and aging for 5 days; the mixed sol was placed in a muffle furnace at 120°C, and after heat preservation and preheating for 10 minutes, the temperature was raised to 200°C at 2°C / min, and after heat preservation and calcination for 2 hours , stand to cool to room temperature, get the calcined product and place it in a ball mill jar, ball mill it at 250r / min for 3h, and pass through a 150 mesh sieve to prepare nano-titanium dioxide powder; weigh 45 parts of deionized water in parts by weight , 20 parts of tetrapropylammonium hydroxide and 20 parts of ethyl orthosilicate were placed in a beaker, stirred and mixed at room temperature for 20 hours, then transferred...
example 3
[0025] First, according to the mass ratio of 1:3, tetrabutyl titanate and 80% ethanol solution were stirred and mixed, and then the pH was adjusted to 2.3 with 15% acetic acid solution under heating in a water bath at 37°C. After the dropwise addition was completed, After heat preservation and stirring for 2 hours, the mixed sol was prepared by standing and aging for 6 days; the mixed sol was placed in a muffle furnace at 125°C, and after heat preservation and preheating for 12 minutes, the temperature was raised to 220°C at 2°C / min, and after heat preservation and calcination for 2 hours , stand to cool to room temperature, get the calcined product and place it in a ball mill jar, ball mill it at 270r / min for 4h, and pass through a 150 mesh sieve to prepare nano-titanium dioxide powder; weigh 47 parts of deionized water in parts by weight , 22 parts of tetrapropylammonium hydroxide, and 22 parts of ethyl orthosilicate were placed in a beaker, stirred and mixed at room temperat...
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