Nano zinc oxide surface modifying method

A technology of nano-zinc oxide and nano-zinc oxide powder, which is applied in cosmetics, pharmaceutical formulations, cosmetic preparations, etc., can solve the problems of time-consuming, many operation steps, and increased production costs, and achieve simple process, easy industrialization, and smooth The effect of catalytic activity inhibition

Active Publication Date: 2009-09-30
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This secondary treatment method has many steps and takes too long, which greatly increases the production cost.

Method used

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  • Nano zinc oxide surface modifying method
  • Nano zinc oxide surface modifying method
  • Nano zinc oxide surface modifying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) After mixing 150ml of deionized water and 50ml of ethanol in a beaker, take 6.5g of nano-zinc oxide powder and add it, ultrasonic treatment for 30min to fully disperse the nano-zinc oxide, then transfer to a 500ml three-neck bottle.

[0024] 2) Take 0.003mol tetraethyl orthosilicate, 0.027mol dimethyldiethoxysilane and 25ml ethanol and mix thoroughly, add into a three-necked bottle under vigorous stirring; adjust the pH of the solution to 9 with ammonia water (27%), and raise the temperature at the same time to 50°C and react for 10 hours.

[0025] After the reaction is completed, filter, and the obtained filter cake is dried at 100°C for 24 hours, ground and pulverized to obtain surface-modified nano-zinc oxide powder.

[0026] Comparative Example of Embodiment 1

[0027] 1) After mixing 150ml of deionized water and 50ml of ethanol in a beaker, take 6.5g of nano-zinc oxide powder and add it, ultrasonic treatment for 30min to fully disperse the nano-zinc oxide, then...

Embodiment 2

[0031] 1) After mixing 150ml of deionized water, 25ml of ethanol and 25ml of propanol in a beaker, take 6.5g of nano-zinc oxide powder and add it, ultrasonic treatment for 30min to fully disperse the nano-zinc oxide, then transfer it into a 500ml three-neck bottle.

[0032] 2) Take 0.015mol ethyl orthosilicate, 0.015mol monomethyltriethoxysilane and 25ml ethanol and mix thoroughly, add into a three-necked bottle under vigorous stirring; adjust the pH of the solution to 9 with ammonia water (27%), and raise the temperature at the same time to 70°C and react for 12 hours.

[0033] After the reaction, the product system was filtered, and the obtained filter cake was dried at 120°C for 12 hours, ground and pulverized to obtain surface-modified nano-zinc oxide powder.

Embodiment 3

[0035] 1) After mixing 100ml of deionized water, 25ml of methanol and 25ml of ethanol in a beaker, take 6.5g of nano-zinc oxide powder with a particle size of 10-100nm and add it, and use an emulsifier to high-speed shear (4000rmp, 10min) to make the nano Zinc oxide is fully dispersed and transferred to a 500ml three-neck bottle.

[0036] 2) Take 0.042mol of methyl orthosilicate, 0.018mol of diphenyldiethoxysilane and 25ml of methanol and mix them thoroughly, and add them into a three-necked flask under vigorous stirring; adjust the pH of the solution to 10 with sodium hydroxide solution, and simultaneously heat up to 80°C, react for 10 hours.

[0037] After the reaction is finished, the product system is directly spray-dried to obtain surface-modified nano-zinc oxide powder.

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Abstract

The invention relates to a nano zinc oxide surface modifying method, which adopts the technical proposal comprising the following steps that: 1) nano zinc oxide powder is fully dispersed in mixed solution of deionized water and latent solvent to form slurry; and 2) a modifier consisting of tetraethyl orthosilicate and/or methyl silicate and organosilane is evenly mixed with the latent solvent, the mixture is added into the slurry in stirring, pH value is adjusted to be between 8 and 12 for reaction, the reaction temperature is about 90 DEG C and the reaction time is between 3 and 12 hours, wherein the organosilane is polydimethylsilane or/and silane coupling agent. The method adopts a common aqueous-phase chemical reaction method, uses common devices, can complete the surface modification on the nano zinc oxide powder of an organic-inorganic hybrid material through a one-step reaction, and has simple process and easy industrialization. Prepared products improve compatability with organic substrates, make the photocatalytic activity inhibited, and are particularly suitable to be used as a UV blocking agent in sun-screen cosmetics.

Description

technical field [0001] The invention relates to a method for modifying the surface of nano zinc oxide, in particular to a method for modifying the surface of nano zinc oxide with an organic-inorganic hybrid material. Background technique [0002] Ultraviolet rays in sunlight can be divided into UVA (320-400nm), UVB (290-320nm) and UVC (200-290nm) according to their wavelengths, all of which can cause damage to the skin. Among them, most of UVC can be absorbed by the ozone layer; UVB is the main source of burns, indirect pigmentation and skin cancer; UVA will aggravate the damage of UAB, which is the cause of photoaging such as decreased skin elasticity, rough skin and increased wrinkles. Prime culprit. Physical sunscreens such as zinc oxide and titanium dioxide have attracted much attention due to their high safety and stability. In particular, nano-zinc oxide can not only shield UVB, but also has a good shielding effect on UVA, and can provide full-band protection. In ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/891A61K8/27A61Q17/04
Inventor 曹智张治军
Owner HENAN UNIVERSITY
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