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TiO2/C reinforced fingerprint appearing magnetic powder and preparation method and application thereof

A magnetic powder and fingerprint technology, which is applied in application, diagnostic recording/measurement, medical science, etc., can solve the problems of harsh use conditions of fingerprint display powder, inability to adapt to the surface of different object substrates, and insufficient clear contrast of fingerprint display, so as to promote industrialization The effect of production, fingerprint coloring is obvious, and it is easy to store for a long time

Active Publication Date: 2016-03-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this method is complicated, not environmentally friendly, and the cost is high, which is not conducive to its widespread use.
[0012] The above-mentioned patents have prepared various fingerprint display materials by different methods, but there are still the following four significant disadvantages: (1) The preparation method is complicated and the process requirements are harsh, which greatly limits its application in industry; (2) The preparation Toxic substances are introduced in different degrees during the process, which endangers the health of the operator; (3) The fingerprint display powder is used under harsh conditions and does not have high adaptability; (4) The fingerprint lines are not obvious enough, and the contrast of the fingerprint display is not clear enough to adapt to different The surface of the object matrix; (5) Fingerprints are easily destroyed, and the fingerprint powder is easily wiped off, making it difficult to reappear, which increases the difficulty of operation
[0013] To sum up, there is currently a lack of fingerprint display magnetic powder materials with simple preparation process, environmental protection, high sensitivity, high contrast, high adaptability and other characteristics in the market.

Method used

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  • TiO2/C reinforced fingerprint appearing magnetic powder and preparation method and application thereof
  • TiO2/C reinforced fingerprint appearing magnetic powder and preparation method and application thereof
  • TiO2/C reinforced fingerprint appearing magnetic powder and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, the chemical formula of the magnetic powder exhibited by white fingerprints is Fe 44 (BN) 44 (TiO 2 ) 12 .

[0043] The preparation method of above-mentioned fingerprint revealing magnetic powder is as follows:

[0044] (1) Prepare commercially available Fe powder, BN powder and TiO 2 pink;

[0045] (2) The purity of Fe powder is 99.5%, the particle size is 35 μm, the purity of BN powder is 99.5%, the particle size is 10 μm, TiO 2 The purity of the product is 99.5%, the particle size is 6.5 μm, and the ingredients are made according to the atomic percentage of the composition;

[0046] (3) The raw materials weighed in step (2) are placed in a ball mill, the ball-to-material ratio is 10:1, and the ball milling process parameters are rotating speed: 300 rpm, time: 90 minutes and sieved with a 100-mesh particle size sieve;

[0047] (4) Put the magnetic powder mixture obtained in step (3) in an oven and store it at 50° C. for 60 minutes.

[0048]...

Embodiment 2

[0051] In the present embodiment, the compositional chemical formula of the fingerprint display magnetic powder is (Fe 78 Si 9 B 13 ) 44 (BN) 44 (TiO 2 ) 12 .

[0052] The preparation method of above-mentioned fingerprint revealing magnetic powder is as follows:

[0053] (1) Prepare commercially available Fe 78 Si 9 B 13 Amorphous powder, BN powder and TiO 2 pink;

[0054] (2) Fe 78 Si 9 B 13 The purity of amorphous powder is 99.5%, the particle size is 35μm, the purity of BN powder is 99.5%, the particle size is 10μm, TiO 2 The purity of the product is 99.5%, the particle size is 6.5 μm, and the ingredients are made according to the atomic percentage of the composition;

[0055] (3) The raw materials weighed in step (2) are placed in a ball mill, the ball-to-material ratio is 10:1, and the ball milling process parameters are rotating speed: 300 rpm, time: 90 minutes and sieved with a 100-mesh particle size sieve;

[0056] (4) Put the magnetic powder mixture ob...

Embodiment 3

[0060] In this embodiment, the chemical formula of the fingerprint revealing magnetic powder is Co 60 (BN) 30 (TiO 2 ) 10 .

[0061] The preparation method of above-mentioned fingerprint revealing magnetic powder is as follows:

[0062] (1) prepare commercially available Co powder, BN powder and carbon black powder;

[0063] (2) The purity of Co powder is 99.5%, the particle size is 23μm, the purity of BN powder is 99.5%, the particle size is 10μm, TiO 2 The purity of the product is 99.5%, the particle size is 6.5 μm, and the ingredients are made according to the atomic percentage of the composition;

[0064] (3) The raw materials weighed in step (2) are placed in a ball mill, the ball-to-material ratio is 10:1, and the ball milling process parameters are rotating speed: 300 rpm, time: 90 minutes and sieved with a 100-mesh particle size sieve;

[0065] (4) Put the magnetic powder mixture obtained in step (3) in an oven and store it at 50° C. for 60 minutes.

[0066] (5)...

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Abstract

The invention relates to TiO2 / C reinforced fingerprint appearing magnetic powder and a preparation method and application thereof, and belongs to the technical field of fingerprint identification. The fingerprint appearing magnetic powder is prepared from magnetic powder, developing powder and coloring powder. The chemical formula of the ingredients of the fingerprint appearing magnetic powder is Ma(BN)bXc, M is the magnetic powder and selected from at least one of Fe powder, Co powder, Ni powder, Fe3O4 powder and Fe78Si9B13 amorphous powder. BN is the developing powder, X is the coloring powder and selected from one of TiO2 and C, the subscripts a, b and c are the atom percentages of the corresponding elements, a is larger than or equal to 40 and smaller than or equal to 60, b is larger than or equal to 30 and smaller than or equal to 50, c is larger than or equal to 5 and smaller than or equal to 15, and the sum of a, b and c is 100. Compared with the prior art, the fingerprint appearing magnetic powder has the most prominent advantages that on the premise of high appearing precision, the preparation process is simplified, the fingerprint appearing magnetic powder is widely suitable for various complex environments, and high actual application value is achieved.

Description

technical field [0001] The invention belongs to the technical field of fingerprint identification, and in particular relates to a TiO 2 / C enhanced fingerprint display magnetic powder and its preparation method and application. Background technique [0002] Fingerprints have the characteristics of being different from person to person, basically unchanged, leaving traces when touched, and identifying a person. Therefore, the discovery, extraction and identification of fingerprints have important practical effects on security and criminal investigation. [0003] Since 1877, the French doctor Aubert used silver nitrate to visualize fingerprints on paper, which opened a multidisciplinary fingerprint visualization science that comprehensively utilizes physics, chemistry, and biology. After more than 100 years of development, fingerprint display methods mainly include: physical attachment, chemical reaction, physical and chemical action and laser display method. At present, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/1172
Inventor 陆伟向震王韬磊马尚军夏卡达牛俊超
Owner TONGJI UNIV
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