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Fingerprint developer and preparation method thereof

A technology of developing agent and fingerprint, applied in medical science, sensor, diagnostic record/measurement, etc., can solve the problem of poor fingerprint display effect and so on

Active Publication Date: 2019-01-15
SUZHOU NAPO ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on this, it is necessary to provide a fingerprint revealing agent and its preparation method for the problem that the traditional fingerprint revealing technology has poor fingerprint revealing effect on the special carrier surface (wet surface, sticky surface)

Method used

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  • Fingerprint developer and preparation method thereof
  • Fingerprint developer and preparation method thereof
  • Fingerprint developer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0043] The invention also provides a method for preparing the fingerprint visualizer.

[0044] A method for preparing a fingerprint display agent includes mixing nanometer carbon black, a non-ionic surfactant, an ionic surfactant and deionized water to adjust the pH value to 5-6.5. Wherein, the mass ratio of the nano-scale carbon black, non-ionic surfactant, ionic surfactant and deionized water is 2-30:0.001-3:0.1-3:60-96.

[0045] In a preferred embodiment, the mixing adopts a mechanical mixing method, for example, a high-speed mixer or a high-speed shearing machine is used for mixing. Of course, it can be understood that other mixing methods deemed suitable by those skilled in the art can also be used, and the mixing method is not too limited.

[0046] In a preferred embodiment, the pH value is adjusted to the above range by an acid-base solution, which is selected from one or a combination of citric acid, sorbic acid and acetic acid. The lye is selected from one or a combination...

Embodiment 1

[0056] The preparation method of a fingerprint display agent is as follows:

[0057] 1) Weigh 200g of high pigment ultrafine carbon black powder with an average particle size of 40nm, 2g Tween T-80, 40g sodium benzenesulfonate and 1758g deionized water.

[0058] 2) Put the weighed high pigment ultrafine carbon black powder, sodium cholate and deionized water into a high-speed mixer and mix for 20 minutes, and set the rotation speed to 5000 rpm. Then add Tween T-80 and mix with a high-speed shearing emulsifier for 5 minutes to obtain a mixed solution, and the rotation speed is set to 5000 rpm.

[0059] 3) Use citric acid to adjust the pH of the above-mentioned mixed solution to 6-8, and the obtained fingerprint visualization agent is recorded as A1.

Embodiment 2

[0061] The preparation method of a fingerprint display agent is as follows:

[0062] 1) Weigh out 200g of high pigment ultrafine carbon black powder with an average particle size of 40nm, 2g of Tween T-80, 60g of β-sitosterol, and 1736g of deionized water.

[0063] 2) Put the weighed high-pigment superfine carbon black powder, β-sitosterol and deionized water into a high-speed shear emulsifier and mix for 20 minutes, and set the rotation speed to 16000 rpm. Then add Tween T-80 and mix with a high-speed shearing machine for 5 minutes to obtain a mixed solution. The rotation speed is set to 5000 rpm; the temperature during mixing does not exceed 60°C.

[0064] 3) Adjust the pH of the above-mentioned mixed liquid to 6.5 with citric acid, and the obtained fingerprint developer is recorded as A2.

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Abstract

The invention relates to a fingerprint developer and a preparation method thereof. The raw material for preparing the fingerprint developer comprises the following components: 30 parts by weight of nanometer carbon black, 0.001-3 parts by weight of nonionic surfactant, 0.1-3 part by weight of ionic surfactant and 60-96 parts by weight of deionized water. The fingerprint developer can clearly display the fingerprint, and the carbon black in the fingerprint developer can be stably dispersed in the liquid fingerprint developer.

Description

Technical field [0001] The invention relates to the technical field of criminal investigation, in particular to a fingerprint display agent and a preparation method thereof. Background technique [0002] At present, fingerprint display technology is widely used in the field of criminal investigation, and it is of great significance for the fixation of evidence in criminal investigation work. The traditional fingerprint visualization is mainly the powder visualization method, which mainly improves the sensitivity of the method by reducing the particle size of the powder. However, the smaller the particle size of the powder, the greater the amount of powder suspended in the air, and the longer the suspension time, the greater the damage to professional and technical personnel. At the same time, certain carcinogenic fluorescent fuels and toxic and harmful gases produced by the decomposition reaction of fumigation reagents also cause serious harm to the health of professional and te...

Claims

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Application Information

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IPC IPC(8): A61B5/1172
CPCA61B5/1172
Inventor 周玄全祝飞
Owner SUZHOU NAPO ADVANCED MATERIAL TECH CO LTD