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Potential fingerprint extracting/presentation gel composite film and radiation preparation method thereof

A composite membrane and gel technology, applied in the field of preparing gel fingerprint extraction/display composite membranes, can solve problems such as no patent application, and achieve the effects of simplifying the production process, saving costs, and mild reaction conditions

Inactive Publication Date: 2017-01-04
HUBEI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] After searching, there is no patent application identical to the present invention in China

Method used

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  • Potential fingerprint extracting/presentation gel composite film and radiation preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] Example 1: Put 0.167g polyvinyl alcohol (polymerization degree 1670) into 6mL deionized water at 95°C, stir at 150r / min, heat and stir for 2h, after completely dissolving, cool to 50°C, add 1.669g Carboxymethyl chitosan, 0.111g disodium hydrogen phosphate, stir for 1h, make it dissolve completely to form a homogeneous solution, pass into N 2 0.5h, then stand under negative pressure to defoam for 2h, inject to 15×5×1mm 3 In the PE mold, rapid vacuum freeze-drying is formed, and the product is taken out and vacuum-packed in a PE film bag and thawed at room temperature. After 3 cycles of freezing-thawing, irradiate with an electron beam accelerator, select the irradiation dose as 20kGy, and irradiate at a dose rate of 5kGy / pass, place the obtained sample in a 0.01% quantum dot solution, and avoid light After standing for 2 hours, vacuum-packing and storing in a 4°C freezer for later use, the latent fingerprint extraction / display gel composite film can be prepared, which ...

Embodiment 2

[0027]Example 2: Put 0.368g collagen into 7mL deionized water at 50°C, stir at 150r / min, heat and stir for 2h, after completely dissolving, cool to 20°C, add 2.943g hydroxypropyl chitosan respectively , 0.368g glacial acetic acid, stir for 1h, make it dissolve completely and form a homogeneous solution, pass into N 2 0.5h, then stand under negative pressure to defoam for 2h, inject to 15×5×1mm 3 In the PE mold, rapid vacuum freeze-drying is formed, and the product is taken out and vacuum-packed in a PE film bag and thawed at room temperature. After 3 cycles of freezing-thawing, irradiate with an electron beam accelerator, select the irradiation dose as 30kGy, and irradiate at a dose rate of 10kGy / pass, place the obtained sample in a 0.1% silver nitrate solution, and avoid light After standing for 4 hours, vacuum-packing and storing in a 4°C freezer for later use, the latent fingerprint extraction / display gel composite film can be prepared, which can be effectively applied to...

Embodiment 3

[0028] Example 3: Put 0.184g of N-isopropylacrylamide into 7mL of deionized water at 60°C, stir at 150r / min, heat and stir for 2h, after completely dissolving, cool to 20°C, and add 3.862g of carboxyl Methyl cellulose, 0.110g sodium bicarbonate, stir for 1h, make it dissolve completely and form a homogeneous solution, pass N 2 0.5h, then stand under negative pressure to defoam for 2h, inject to 15×5×1mm 3 In the PE mold, rapid vacuum freeze-drying is formed, and the product is taken out and vacuum-packed in a PE film bag and thawed at room temperature. After 3 cycles of freezing-thawing process, irradiate with an electron beam accelerator, the selected irradiation dose is 60kGy, and the conditions of dose rate 30kGy / pass are irradiated, and the obtained sample is placed in 0.2% ninhydrin solution to avoid Let it stand for 6 hours, vacuum seal it and store it in a 4°C freezer for later use, and then the latent fingerprint extraction / visualization gel composite film can be pre...

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Abstract

The invention discloses a potential fingerprint extracting / presentation gel composite film and a radiation preparation method thereof. A gel composite film base material consists of natural polysaccharide or dendritic macromolecules, a radiation sensitizer, a pH regulator and a solvent. The radiation preparation method comprises the following steps: carrying out radiation crosslinking reaction under ionizing rays generated by gamma rays or electronic rays; placing an obtained intermediate sample in a color developing agent solution; standing for 2-8 hours in a dark place; packaging under vacuum; and storing in a cabinet freezer at the temperature of 4 DEG C for subsequent use to obtain the potential fingerprint extracting / presentation gel composite film. By the potential fingerprint extracting / presentation gel composite film, fingerprint extracting and presentation are unified organically, maximum optimization of performance of composite gel and expansion of a function range are realized, and effects of complete extracting, effective presentation and long-time storage of potential fingerprints of permeable objects and impermeable objects are achieved. The method has the features of speediness, simplicity, high efficiency, sensitiveness, no damage, no toxicity and the like, and is particularly suitable for the technical fields of fingerprint extracting and presentation in criminal cases and civil cases and the like.

Description

technical field [0001] The invention relates to a latent fingerprint extraction / display gel composite film and a radiation preparation method thereof, in particular to a method for preparing a gel fingerprint extraction / display composite film by cross-linking polymer radiation with ionizing radiation. Background technique [0002] Fingerprints are recognized as the top evidence in the judiciary because of their characteristics of being different, unchanged throughout life, and leaving marks on objects touched, and are widely used in criminal and civil cases. Fingerprints are usually left in the form of latent fingerprints at the scene. Latent fingerprints refer to when people's fingers and palms touch objects, due to the interaction of sweat and oil on the object surface, they leave papillae lines on the object surface that reflect the palm surface skin. Patterned imprints. Since it is difficult for people to observe the latent fingerprints with the naked eye or directly wi...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08L29/04C08L89/00C08L79/02C08L1/28C08L101/00C08J7/12C08J5/18C08J3/28C08J3/24
CPCC08L5/08C08J3/24C08J3/28C08J5/18C08J7/12C08J2301/28C08J2305/08C08J2379/02C08J2400/00C08L1/286C08L79/02C08L101/005C08L2203/16
Inventor 李月生韩炎秦江涛梅成
Owner HUBEI UNIV OF SCI & TECH
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