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Method for evaluating ultraviolet shielding properties of nano powder material

A nano-powder, external shielding technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of UV shielding properties that are not suitable for nano-powder materials, and achieve fast analysis and testing speed, good data reproducibility, and low cost. Effect

Inactive Publication Date: 2003-07-23
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are generally only suitable for evaluating the UV shielding performance of organic UV shielding agents, not for the evaluation of UV shielding performance of nano-powder materials.

Method used

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  • Method for evaluating ultraviolet shielding properties of nano powder material
  • Method for evaluating ultraviolet shielding properties of nano powder material
  • Method for evaluating ultraviolet shielding properties of nano powder material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The nano powder material to be evaluated is P25 nano TiO produced by Germany Degussa company 2 , and its specific technical indicators are: the particle size is 21nm, and the BET surface area is 50±15m 2 / g, crystal form is 80% anatase phase, 20% rutile phase; preparation method, gas phase method.

[0029] Utilize method provided by the invention and Varian, Cary 50 Probe type ultraviolet-visible spectrophotometer, record the ultraviolet shielding curve of this material as figure 2 (A) shown. The scanning results show that the material has a very high platform in the ultraviolet region, the maximum absorbance value A is 0.79, and the ultraviolet shielding performance of the material is evaluated as excellent.

Embodiment 2

[0031] The nano powder material to be evaluated is CFA-TiO provided by a domestic company 2 Nano powder material, the material particle size is 90nm, and the crystal form is rutile mineral phase.

[0032] Utilize method provided by the invention and Varian, Cary 50 Probe type ultraviolet-visible spectrophotometer, record the ultraviolet shielding curve of this material as figure 2 (B) shown. The scanning results show that the maximum absorbance value A of the material in the ultraviolet region is 0.47, and the ultraviolet shielding performance of the material is evaluated as a qualified level.

Embodiment 3

[0034] The nano powder material to be evaluated is nano Fe 2 o 3 . The particle size is 48nm.

[0035] Utilize method provided by the present invention and Varian, Cary 50 Probe type ultraviolet-visible spectrophotometer, record this material ultraviolet shielding curve as figure 2 (C) shown. The scanning results show that the maximum absorbance value A of the material in the ultraviolet region is 0.30, and the ultraviolet shielding performance of the material is evaluated as a poor level.

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Abstract

The invention belongs to the technique area of evaluating the properties of materials. The steps of operation includes preparing the crane, the setting up the disperse system of the nano powder material to the evaluated, the setting up the background, the measuring the ultraviolet sheidling curve of the material and the evaluating the performance of shielding ultraviolet. Glycol is selected as the dispersant. Siphon technique is utilized to carrier out the automatic film coating, providing high accuracy, good repeatability, fast analysis testing. The method can evaluate the properties of material for shielding ultraviolet, providing the reference frame for developing new nano material and filtering out suitable material for shielding ultraviolet so as to possess wide application prospect.

Description

Technical field [0001] The invention relates to a method for evaluating the ultraviolet shielding performance of a nano-powder material, which belongs to the technical field of material performance evaluation. Background technique [0002] Due to its unique physical and chemical properties, nanopowder materials have been extensively studied and initially applied. Various materials such as nano-powder titanium dioxide and zirconium dioxide have been added to cosmetics and sunscreen coatings to shield the ultraviolet rays in the sun, prevent human body damage, and delay the aging of coatings. At present, there are many methods to evaluate the UV shielding performance of materials, and the common ones are solution method, tape method and thin film (coating film) method. However, these methods are generally only suitable for evaluating the UV shielding performance of organic UV shielding agents, not for the evaluation of UV shielding performance of nano-po...

Claims

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Application Information

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IPC IPC(8): G01N21/33
Inventor 金利通陈俊水张继东刘梅川张文鲜跃仲朱民施国跃
Owner EAST CHINA NORMAL UNIVERSITY
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