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High ultraviolet reflection biological ceramic material

A bio-ceramic material, high-reflection technology, applied in nanotechnology and other directions, can solve the problem of metal-doped hydroxyapatite phase, morphology description of ultraviolet reflection ability, amorphous apatite structure instability, ultraviolet dissipation ability Not high problems, to achieve the effect of strong sunscreen timeliness, human safety, and conducive to reflection

Active Publication Date: 2020-01-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it does not describe the phase, morphology and UV reflection ability of specific metal-doped hydroxyapatite.
In addition, the structure of amorphous apatite (ACP), a bioceramic material in the prior art, is unstable, and it will easily transform amorphous apatite (ACP) into crystalline hydroxyapatite under heating conditions, so the general drying temperature Not more than 100℃
[0007] To sum up, most of the existing organic and electrodeless sunscreen materials are UV-absorbing materials, so they have absorption saturation, generally have low dissipation capacity for ultraviolet rays, and also have potential biological hazards such as sensitization and nano-biotoxicity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 (the product is the best group of bioceramics: (10Zn bioceramics))

[0031] The chemical precipitation method is used to prepare bioceramic materials with high ultraviolet reflection. The specific operation steps are as follows:

[0032] (1) Preparation of chemical reagents

[0033] The chemical reagents used in the present invention are all analytically pure to ensure that no other impurities appear in the preparation process.

[0034] (2) Reaction solution configuration

[0035] (a) Zn(NO) 3 ) 2 and Ca(NO 3 ) 2 According to the molar ratio of 10:90, it is dissolved in deionized water, and it is formulated to contain Ca. 2+ / Zn 2+ The mixed solution is placed in a container and stirred evenly;

[0036] (b) take (NH 4 ) 2 HPO 4 Dissolved in deionized water, formulated with PO4 3- The solution. with NH 3 H 2 O adjust its solution to PH=10, for subsequent use;

[0037] (3) Zinc doping reaction

[0038] (a) in the above step (2) Ca 2+ / Zn 2+ Th...

Embodiment 2

[0048] Example 2 ((5Zn bioceramic))

[0049] Wherein Zn / Ca=5:95 (x is 0.5), (Zn+Ca) / P=1.67, the ratios are all molar ratios, and the remaining steps are as in Example 1. The obtained zinc-doped calcium-phosphorus bioceramic has an incomplete amorphous structure with a crystallinity of 40%, a needle-like micromorphology, an average particle size of 100-200 nm, and an average UVA and UVB reflectance of nearly 100. %, the average UVC reflectance is about 70%.

[0050] Example 3 (20Zn bioceramic)

[0051] It was prepared by sol-gel method with Ca(NO 3 ) 2 , P 2 O 5 and Zn(NO 3 ) 2 As a reactant, wherein Zn / Ca=20:80 (x is 2), (Zn+Ca) / P=1.67, the ratios are all molar ratios. put P 2 O 5 The solution was slowly added dropwise to Zn(NO 3 ) 2 and Ca(NO 3 ) 2 In the mixed solution of , the reaction temperature was 60 °C for 24 h, and then washed, dried and ground. The obtained powder was calcined at 400 °C for 2 h to obtain the desired sample. The obtained zinc-doped cal...

Embodiment 4

[0052] Example 4: Ultraviolet Emissivity Test

[0053] Samples were tested for UV reflectance using a UV-Vis photometer with an integrating sphere. Using barium sulfate as a reference sample, the products of Examples 1-3, nano-TiO 2 Carry out sample preparation in moulds with two groups of commercially available sunscreen products respectively, and each above-mentioned sample is loaded into a disc-shaped mould, and pressed with a plexiglass cylinder to obtain a test sample with a flat surface, then placed in an instrument, and a wavelength range (200 -400nm) for testing, and finally the UV reflectance data of the tested sample can be obtained. It can be seen from the figure that the ultraviolet reflectance of the product of the present invention is much higher than that of other groups.

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Abstract

The invention discloses a high ultraviolet reflection biological ceramic material, which comprises the following component: Ca10-xZnx(PO4)6(OH)2(x:0.5-2). According to the invention, a calcium salt and a phosphate are selected as reactants, a zinc salt is used as a doping agent, and after a doping reaction, post-treatment is performed to obtain the nanometer zinc-doped calcium phosphorus biological ceramic; the microstructure is in a nanoparticle shape and is an amorphous or weak crystalline structure, and the average particle size of the product is 30-200 nm; and the material has ultrahigh ultraviolet reflectivity, and especially the optimal component Ca9Zn(PO4)6(OH)2 has the average UVA reflectivity of close to 100%, the average UVB reflectivity of close to 100% and the average UVC reflectivity of about 90%.

Description

technical field [0001] The invention relates to a bioceramic material, in particular to a bioceramic material with high ultraviolet reflection. Background technique [0002] Ultraviolet light is divided into UVA, UVB and UVC with wavelengths ranging from 400-315nm, 315-280nm and 280-190nm, respectively. Appropriate amount of ultraviolet radiation is conducive to the synthesis of vitamin D in the human body. However, excessive UV exposure can lead to skin allergies, burns and even skin cancer. In recent years, due to the continuous destruction of the ozone layer, the incidence of skin cancer has increased, and people have become more and more aware of the harm of ultraviolet rays to the human body. Therefore, the study of materials with high UV reflection properties has important practical application value. [0003] At present, the protection of ultraviolet rays mainly lies in using the physical and chemical properties of materials to reflect or absorb ultraviolet rays to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/447C04B35/626B82Y40/00C04B35/624
CPCC01P2004/62C01P2004/64C04B35/447C04B35/624C04B35/626C04B35/6261C04B35/62655C04B2235/443C04B2235/447C04B2235/9646
Inventor 汪涛王阳阳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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