Carboxylation modified nano titanium dioxide ultraviolet screening agent and preparation method thereof
A technology of nano-titanium dioxide and ultraviolet shielding agent, which is applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of affecting the reactivity of nano-TiO, consuming acrylic acid, etc., to improve the ultraviolet shielding performance and reduce agglomeration , The effect of enhancing light absorption
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[0038] Carboxylation modified nano-TiO of the present invention 2 The preparation method of the ultraviolet shielding agent comprises the following steps: according to the mass fraction, 8-10 parts of TiO 2 -NH 2 Add to 100-120 parts of absolute ethanol, ultrasonically disperse for 30 minutes, pour the suspension into a three-necked flask, stir and heat up to 60°C, with a rotation speed of 400r / min, add 4-8 parts of aldehydes and 3-5 parts Acrylic acid, 60°C magnetic stirring reaction for 5h, cooling the product, centrifuging to remove the supernatant, washing the white precipitate in the lower layer with alcohol, drying in a vacuum oven at 40°C for 5h to obtain carboxylated modified nano-TiO 2 UV screener. Among them, TiO 2 -NH 2 through γ-aminopropyltriethoxysilane and nano-TiO 2 reaction, the nano-TiO 2 Amino groups are introduced into the surface.
[0039] Specifically, the carboxylation modified nano-TiO of the present invention 2 The preparation method of ultravi...
Embodiment 1
[0049] Step 1: TiO 2 -NH 2 preparation of
[0050] Weigh 1g nano TiO 2 Put it in an oven and dry it at 60°C for 4 hours to obtain dried nano-TiO 2 ; 0.5g gamma-aminopropyltriethoxysilane is added in the beaker that 150g absolute ethanol and ultrapure water mixed solution (the mass ratio of absolute ethanol and ultrapure water is 9:1) are housed, magnetic stirring, pre- Hydrolyzed for 50min to obtain γ-aminopropyltriethoxysilane prehydrolyzate; the dried nano TiO 2 Add 80g of absolute ethanol and ultrapure water mixed solution (mass ratio of absolute ethanol and ultrapure water is 4:1) into a beaker and ultrasonically disperse for 1h to obtain nano-TiO 2 dispersion, the nano-TiO 2 Pour the dispersion into a three-necked flask, heat and stir in a water bath, set the water bath temperature of the reaction system to 40°C, and the stirring speed to 300r / min, and add ammonia water to adjust the pH of the reaction system to neutral, and stir for 40 minutes to obtain a neutral N...
Embodiment 2
[0054] Step 1: TiO 2 -NH 2 preparation of
[0055] Weigh 1g nano TiO 2 Put it in an oven and dry it at 60°C for 4 hours to obtain dried nano-TiO 2 ; 0.5g gamma-aminopropyltriethoxysilane is added in the beaker that 150g absolute ethanol and ultrapure water mixed solution (the mass ratio of absolute ethanol and ultrapure water is 9:1) are housed, magnetic stirring, pre- Hydrolyzed for 50min to obtain γ-aminopropyltriethoxysilane prehydrolyzate; the dried nano TiO 2 Add 80g of absolute ethanol and ultrapure water mixed solution (mass ratio of absolute ethanol and ultrapure water is 4:1) into a beaker and ultrasonically disperse for 1h to obtain nano-TiO 2 dispersion, the nano-TiO 2 Pour the dispersion into a three-necked flask, heat and stir in a water bath, set the temperature of the water bath in the reaction system to 40°C, and the stirring speed to 300r / min, add sodium hydroxide to adjust the pH of the reaction system to neutral, and stir for 40 minutes to obtain Neutr...
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