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Latent fingerprint developing agent and preparation method thereof

A developer and latent fingerprint technology, applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as difficult to distinguish, blurred boundaries of fingerprint lines, etc., and achieve the effect of not easy to fly, clear fingerprints, and high sensitivity

Pending Publication Date: 2021-07-30
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a latent fingerprint developer, which solves the problem that the existing molybdenum disulfide powder easily absorbs moisture and is easily oxidized, which results in fuzzy boundaries of fingerprint lines and difficult identification in fingerprint visualization.

Method used

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  • Latent fingerprint developing agent and preparation method thereof
  • Latent fingerprint developing agent and preparation method thereof
  • Latent fingerprint developing agent and preparation method thereof

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preparation example Construction

[0026] The preparation method of above-mentioned a kind of latent fingerprint developing agent, specifically implement according to the following steps:

[0027] Step 1, weighing according to mass percentage: 5-10 parts of perfluoroalkyl phosphate, 90-95 parts of molybdenum disulfide powder, the sum of the mass percentages of the above components is 100%;

[0028] Step 2. Crush the perfluoroalkyl phosphate ester weighed in step 1 to 60-80 mesh, put it into absolute ethanol, heat and dissolve until clarified, filter, place the filtrate in a closed container, and keep it warm at 40°C to 50°C ,spare;

[0029] Step 3. Put the molybdenum disulfide powder weighed in step 1 into absolute ethanol, disperse it by ultrasonic wave for 30min-60min, adjust the pH value to 6.5-7.0 with 30% sodium hydroxide solution by mass percentage, and heat in a water bath for 30min ~40min;

[0030] Step 4. Gradually and slowly add the perfluoroalkyl phosphate ethanol solution in step 1 to the ethanol ...

Embodiment 1

[0040] Step 1, weighing: 0.5g of perfluoroalkyl phosphate, 9.5g of molybdenum disulfide powder, the sum of the mass percentages of the above components is 100%;

[0041] Step 2. Crush the perfluoroalkyl phosphate ester weighed in step 1 to 60-80 mesh, put it into 25g of absolute ethanol, heat and dissolve until clarified, filter, keep the filtrate in a closed container at 40°C, and set aside;

[0042] Step 3. Put the molybdenum disulfide powder weighed in step 1 into 47.5g of absolute ethanol, disperse it by ultrasonic wave for 30min, adjust the pH value to 6.5-7.0 with 30% sodium hydroxide solution by mass percentage, and place it in a water bath at 50°C Heating for 30min under the condition;

[0043] Step 4. Gradually and slowly add the perfluoroalkyl phosphate ethanol solution in step 1 to the molybdenum disulfide ethanol solution obtained in step 3, and continue ultrasonic dispersion for 30 minutes;

[0044]Step 5. Filter the mixed solution obtained in step 4, wash with a...

Embodiment 2

[0046] Step 1, weighing: 1g of perfluoroalkyl phosphate, 9g of molybdenum disulfide powder, the sum of the mass percentages of the above components is 100%;

[0047] Step 2. Crush the perfluoroalkyl phosphate ester weighed in step 1 to 60-80 mesh, put it into 50g of absolute ethanol, heat and dissolve until clarified, filter, keep the filtrate in a closed container at 50°C, and set aside;

[0048] Step 3. Put the molybdenum disulfide powder weighed in step 1 into 90g of absolute ethanol, disperse it by ultrasonic wave for 60min, adjust the pH value to 6.5-7.0 with 30% sodium hydroxide solution by mass percentage, and put it in a water bath condition of 60°C Under heating for 40min;

[0049] Step 4. Gradually and slowly add the perfluoroalkyl phosphate ethanol solution in step 1 to the molybdenum disulfide ethanol solution obtained in step 3, and continue ultrasonic dispersion for 45 minutes;

[0050] Step 5. Filter the mixed solution obtained in step 4, wash with an appropria...

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Abstract

The invention discloses a latent fingerprint developing agent which comprises the following components in percentage by mass: 5-10 parts of perfluoroalkyl phosphate and 90-95 parts of molybdenum disulfide powder, and the sum of the mass percentages of the components is 100%. The invention also discloses a preparation method, which comprises the following steps: putting the weighed perfluoroalkyl phosphate into absolute ethyl alcohol, heating, dissolving, filtering, and preserving the temperature of filtrate in a closed container at 40-50 DEG C for later use; weighing molybdenum disulfide powder, putting the molybdenum disulfide powder into absolute ethyl alcohol, carrying out ultrasonic dispersion, adjusting the pH value to 6.5-7.0 by using a 30% sodium hydroxide solution, heating in a water bath at 50-60 DEG C, and continuously carrying out ultrasonic dispersion; and gradually and slowly adding a perfluoroalkyl phosphate ethanol solution into the obtained molybdenum disulfide ethanol solution, continuously carrying out ultrasonic dispersion, filtering the obtained mixed solution, washing with pure water, drying the filtered solid, and storing in a silica gel particle dryer. According to the invention, fingerprints can be clearly developed, the adhesion is enhanced by the perfluoroalkyl phosphate modified adhesion promoter, the effect is obvious, and especially the effect on fingerprints on the surfaces of metal and alloy products is very prominent; through coating of perfluoroalkyl phosphate, molybdenum disulfide is not easy to absorb water and agglomerate, and is not easy to oxidize.

Description

technical field [0001] The invention belongs to the technical field of fingerprint visualization, and in particular relates to a latent fingerprint developer, and also relates to a preparation method of the latent fingerprint developer. Background technique [0002] Fingerprints are unique throughout life and have been widely used in immigration inspections, criminal searches and other fields. The powder method is the most common and convenient way to reveal latent fingerprints, that is, use a brush to brush various powders onto the fingerprint area, and absorb the fingerprint residue on the mastoid line through physical, mechanical or electrostatic action, without fingerprint residue The small furrows and the fingerprint carrier of the object will not absorb the powder, and the final result is that the powder adheres to the mastoid line, which forms a contrast with the small furrow and the carrier of the non-adhered powder, thus showing the latent fingerprint . The powder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/1172
CPCA61B5/1172
Inventor 唐军利
Owner JINDUICHENG MOLYBDENUM CO LTD
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