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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.

Inactive Publication Date: 2017-08-25
周益铭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] UV screening agents can be roughly divided into organic UV screening agents and inorganic UV screening agents (mainly metal oxide nanoparticles). Organic UV screening agents mainly include p-aminobenzoic acid derivatives, oxybenzone, 3,5 , 5-trimethylcyclohexyl anthranilic acid methyl ester and dibenzoylmethane, although they have high UV absorption efficiency, they have poor thermal stability, are easily lost during use, and are easily degraded by free radicals and other shortcomings; inorganic ultraviolet shielding agents mainly include some natural mineral materials and metal oxides, especially some nano-oxides, such as nano-TiO 2 , Nano ZnO, Nano SiO 2 , Nano Al 2 o 3 , Nano Fe 2 o 3 etc. Although the inorganic ultraviolet shielding agent has good light and thermal stability, the cost required to make nano powder is relatively high, and it has high photocatalytic activity, which can oxidize and degrade other components around it, affecting the ultraviolet shielding performance. to play

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a preparation method of an ultraviolet screening agent, and belongs to the technical field of inorganic nanometer composite materials. The preparation method comprises the steps that tetrabutyl titanate and ethanol solution are mixed and heated, and after the pH value is adjusted by an acetate solution, aging is conducted to obtain a mixed sol; the mixed sol is subjected to calcination, ball grinding and sieving, and nanometer titanium dioxide powder is obtained; raw materials, such as tetrapropylammonium hydroxide and deionized water, are mixed and heated and subjected to centrifugalization, and lower-layered precipitates are collected, then washed and dried, and mixed and subjected to ball grinding with indium tin oxide; the ball-grinding powder and absolute ethyl alcohol are mixed and dispersed, and a modified dispersion liquid is obtained; the modified dispersion liquid and the prepared nanometer titanium dioxide powder are mixed, heated and filtered, a filter cake is subjected to drying, calcination, grinding and sieving, and the product is obtained. The prepared ultraviolet screening agent can absorb ultraviolet light effectively and lowers photocatalytic activity greatly, and the ultraviolet screening rate can reach 96.5% or above.

Description

technical field [0001] The invention relates to a preparation method of an ultraviolet shielding agent, belonging to the technical field of inorganic nanocomposite materials. Background technique [0002] A moderate amount of ultraviolet rays is beneficial to human health, but excessive ultraviolet rays may damage the eyes, accelerate skin aging, induce skin diseases and even cause cancer. Especially in recent years, with the sharp increase of global carbon dioxide emissions and the thinning of the ozone layer in the atmosphere, the intensity of ultraviolet rays reaching the ground is increasing, resulting in a significant increase in the number of patients with various solar skin diseases. Worldwide, the protection of ultraviolet rays has attracted extensive attention from various countries, and has also caused extensive research and development of people's anti-ultraviolet products. UV shielding agents are usually aromatic compounds or inorganic nanopowder materials conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/32C09D7/12
CPCC08K3/36C08K9/04C08K9/06C08K9/08C08K2003/2231C08K2003/2241C08K2201/011C09D5/32
Inventor 周益铭薛洋王艳芹
Owner 周益铭
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