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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

Pending Publication Date: 2021-09-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Acrylic acid and nano-TiO2 can form hydrogen bonds and chemical bonds, thereby modifying the dispersion of nano-TiO2. 2 modification, the active group carboxyl group of acrylic acid will be consumed during the reaction process, which will affect the reactivity of nano-TiO2 after modification

Method used

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  • Carboxylation modified nano titanium dioxide ultraviolet screening agent and preparation method thereof
  • Carboxylation modified nano titanium dioxide ultraviolet screening agent and preparation method thereof
  • Carboxylation modified nano titanium dioxide ultraviolet screening agent and preparation method thereof

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preparation example Construction

[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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Abstract

The invention discloses a carboxylation modified nano titanium dioxide ultraviolet screening agent and a preparation method thereof, and belongs to the field of photocatalysts and preparation thereof. According to the preparation method, TiO2-NH2 is used as a main monomer, an aldehyde substance is used as a cross-linking agent, acrylic acid is used as a carboxylation modifier, and surface modification is performed on TiO2-NH2 through Mannich reaction to prepare the carboxylation modified nano titanium dioxide ultraviolet screening agent. The preparation method solves the problems of low reaction activity and non-ideal ultraviolet shielding performance caused by easy agglomeration during use of the existing nano titanium dioxide ultraviolet shielding agent, and terminal carboxyl groups are introduced to the surface of aminated modified nano titanium dioxide through Mannich reaction; finally, the nano titanium dioxide ultraviolet screening agent with good dispersibility, chemical reactivity and excellent ultraviolet screening performance is obtained.

Description

technical field [0001] The invention belongs to the field of photocatalyst and its preparation, and relates to a carboxylated modified nano-titanium dioxide ultraviolet shielding agent and a preparation method thereof. Background technique [0002] Ultraviolet light refers to invisible light with a wavelength of 180-400nm. According to different wavelengths, ultraviolet light can be divided into three parts, short-wave ultraviolet light UVC (180-280nm), medium-wave ultraviolet light UVB (280-320nm) and long-wave ultraviolet light UVA (320nm). -400nm). Among them, UVC and most of UVB will be effectively filtered by small molecules such as ozone, oxygen and water vapor in the atmosphere on the earth's surface, and the remaining UVB and UVA will penetrate the atmosphere and radiate to the earth's surface. Studies have shown that proper ultraviolet radiation can promote the metabolism of minerals and the synthesis of vitamin D in the human body. However, when excessively expos...

Claims

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Application Information

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IPC IPC(8): C01G23/047C09K3/00
CPCC01G23/08C09K3/00C01P2006/60
Inventor 马建中刘晨阳张跃宏
Owner SHAANXI UNIV OF SCI & TECH
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