CN111544007A - Adhesive flexible fingerprint display film, preparation method and application - Google Patents
Adhesive flexible fingerprint display film, preparation method and application Download PDFInfo
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- CN111544007A CN111544007A CN202010392545.7A CN202010392545A CN111544007A CN 111544007 A CN111544007 A CN 111544007A CN 202010392545 A CN202010392545 A CN 202010392545A CN 111544007 A CN111544007 A CN 111544007A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
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Abstract
The invention discloses a sticking flexible fingerprint display film, a preparation method and application thereof. Dissolving silver nitrate in a mixed solution of acetone and ethanol to obtain a developing solution A. And dissolving ninhydrin in a mixed solution of acetone and ethyl acetate to obtain a developing solution B. And (3) mixing the developing solution A and the developing solution B with equal volumes to prepare a composite developing solution, uniformly dripping the composite developing solution on the viscous surface of the transparent adhesive tape, and naturally drying to prepare the adhesive flexible fingerprint developing film. The method has the advantages of simple preparation method, low cost, convenient carrying, high displaying speed, suitability for various common and difficult objects such as permeable objects, impermeable objects, plane and curved objects, horizontally placed and non-horizontally placed objects, movable and immovable objects and the like.
Description
Technical Field
The invention belongs to the field of court science, and particularly relates to a flexible fingerprint display film capable of being pasted, a preparation method and application.
Background
Fingerprint appearance is an important research content in the technical fields of court sciences and public security. The chemical reagent developing method is a commonly used fingerprint developing method suitable for permeable objects, and mainly takes silver nitrate or ninhydrin and other reagents as developing agents to react with substances left in fingerprints on the surfaces of the objects so as to develop fingerprint lines. However, amino acids in sweat are easy to diffuse, so that streaks are easy to blur and the contrast is weak when the ninhydrin reagent is displayed, and silver nitrate is easy to be influenced by the environment when displayed, the display effect is unstable, and overexposure is easy to occur to influence the display effect. The ninhydrin solution and the silver nitrate solution are mixed for latent fingerprint development, and the advantages of ninhydrin solution development and silver nitrate solution fingerprint development are integrated. However, this method only improves the sensitivity of fingerprint appearance, cannot expand the application range, and is only suitable for permeable objects, but not for impermeable objects. On the other hand, the time required for display is long, and large-scale equipment is required to be matched and applied, so that the requirement of on-site rapid detection cannot be met.
Disclosure of Invention
The invention provides a sticking flexible fingerprint showing film which can quickly show latent fingerprints on various objects without damaging a material to be detected. The invention also provides a preparation method of the fingerprint revealing film and application of the fingerprint revealing film in the aspect of fingerprint revealing.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the preparation method of the adhesive flexible fingerprint revealing film comprises the following steps:
1) placing silver nitrate in a beaker, mixing acetone and ethanol, pouring into the beaker, and ultrasonically oscillating for 5-20 minutes, wherein the mixed solution is marked as a developing solution A; preferably, the using amount ratio of silver nitrate, acetone and ethanol is 0.2-0.8 g to 15-20 ml to 20-30 ml;
2) putting solid ninhydrin in a beaker, mixing acetone and ethyl acetate solution, pouring the mixture into the beaker, and stirring until no precipitate is formed at the bottom of the beaker, wherein the mixed solution is marked as a developing solution B; preferably, the dosage ratio of the solid ninhydrin, the acetone and the ethyl acetate is 0.3-0.9 g: 5-15 ml;
3) taking a developing solution A and a developing solution B with the same volume, and dropwise adding the developing solution A into the developing solution B to prepare a composite developing solution;
4) the composite developing solution (preferably 10-25 mul/cm)2Concentration of (d) uniformly dripping the mixture on the adhesive surface of the transparent adhesive tape, and naturally drying for at least 5 minutes to obtain the adhesive flexible fingerprint revealing film.
The application of the adhesive flexible fingerprint display film in the aspect of displaying fingerprints is that the adhesive flexible fingerprint display film is adhered to an object with the fingerprints, and the display reaction layer covers the fingerprints and is in direct contact with the fingerprints. If the object is a permeable object, heating and reacting at the constant temperature of 60-90 ℃ for 10 seconds-10 minutes to display the latent fingerprint on the object; and if the object is a non-permeable object, placing the object under an ultraviolet lamp for irradiating for 1-20 minutes to display the latent fingerprint on the object.
The invention has the beneficial effects that:
the adhesive flexible fingerprint showing film provided by the invention has the advantages of simple preparation method, low cost and portability, and the adhesive flexible fingerprint showing film is applied to the field of fingerprint showing and has the following advantages. First, the application range is wide, and both permeable and impermeable objects can be used. When the film is applied to permeable objects such as printing paper, paper cups and the like, compared with the traditional chemical reagent display method, the speed of displaying fingerprints by sticking the flexible fingerprint display film is higher, and the display effect is stable. The adhesive flexible fingerprint showing film can also be applied to impermeable objects, and solves the problem that fingerprints on the surfaces of the impermeable objects cannot be shown in the traditional chemical reagent showing method. Secondly, can paste flexible fingerprint and show that the membrane is dry state and fingerprint contact when showing the fingerprint, consequently can not harm in examining the material, and show fastly. And thirdly, the adhesive flexible fingerprint display film can be directly fixed on an object, and can be bent at will and attached to the surface of the object due to the flexibility of the adhesive flexible fingerprint display film, so that the adhesive flexible fingerprint display film can be used for displaying common curved, immovable and non-horizontally placed difficult objects such as PVC pipes, aluminum alloy doors and windows, door and window glass, railings, walls and the like, and overcomes the defects of the traditional display method.
Drawings
Fig. 1 is a fingerprint appearance photograph on printing paper in example 1.
Fig. 2 is a photograph showing the fingerprint on the paper cup in example 2.
Fig. 3 is a photograph showing the appearance of fingerprints on the glass door in example 3.
Detailed Description
The technical solution of the present invention will be further specifically described below by way of specific examples. It is to be understood that the practice of the invention is not limited to the following examples, and that any variations and/or modifications may be made thereto without departing from the scope of the invention.
Example 1
1) 0.35g of silver nitrate is placed in a beaker, 18ml of acetone and 20ml of ethanol are mixed and poured into the beaker filled with the silver nitrate, the beaker is placed on an ultrasonic oscillator and is shaken for 15 minutes, and the mixed solution is marked as developing solution A.
2) 0.5g of solid ninhydrin was placed in a beaker, mixed with 10ml of acetone and 10ml of ethyl acetate solution and poured into the beaker containing ninhydrin, and stirred with a glass rod until no precipitate is formed at the bottom of the beaker, and the mixture was labeled as developer B.
3) And mixing the developing solution A and the developing solution B with the same volume milliliter number, and slowly dripping the developing solution A into the developing solution B to prepare the composite developing solution.
4) The prepared composite developing solution is mixed according to the proportion of 20 mu l/cm2The concentration of the compound is uniformly dripped on the sticky surface of the transparent adhesive tape, and the transparent adhesive tape is naturally dried for 10 minutes to obtain the adhesive flexible fingerprint showing film with a showing reaction layer in the middle and the two ends remaining sticky.
5) The prepared adhesive flexible fingerprint display film is adhered to an area of printing paper where a fingerprint is left, and the display reaction layer covers the fingerprint and is in direct contact with the fingerprint. Heating at 70 deg.C for 2 min to display latent fingerprint on the object, as shown in FIG. 1.
Example 2
1) 0.5g of silver nitrate is placed in a beaker, 17ml of acetone and 22ml of ethanol are mixed and poured into the beaker filled with the silver nitrate, the beaker is placed on an ultrasonic oscillator and is shaken for 18 minutes, and the mixed solution is marked as developing solution A.
2) Solid ninhydrin 0.45g was placed in a beaker, mixed with 13ml acetone and 13ml ethyl acetate solution and poured into the beaker with ninhydrin, and stirred with a glass rod until no precipitate is formed at the bottom of the beaker, and the mixture is labeled as developer B.
3) And mixing the developing solution A and the developing solution B with the same volume milliliter number, and slowly dripping the developing solution A into the developing solution B to prepare the composite developing solution.
4) The prepared composite developing solution is mixed according to the proportion of 20 mu l/cm2The concentration of the compound is uniformly dripped on the sticky surface of the transparent adhesive tape, and the transparent adhesive tape is naturally dried for 15 minutes to obtain the adhesive flexible fingerprint showing film with a showing reaction layer in the middle and the two ends remaining sticky.
The prepared adhesive flexible fingerprint display film is adhered to a paper cup with a fingerprint, and the display reaction layer is covered on the fingerprint and is in direct contact with the fingerprint. Heating at 80 deg.C for 1 min to display latent fingerprint on paper cup, as shown in FIG. 2.
Example 3
1) 0.65g of silver nitrate is placed in a beaker, 19ml of acetone and 24ml of ethanol are mixed and poured into the beaker filled with the silver nitrate, the beaker is placed on an ultrasonic oscillator and is oscillated for 18 minutes, and the mixed solution is marked as developing solution A.
2) Solid ninhydrin 0.45g was placed in a beaker, mixed with 14ml acetone and 14ml ethyl acetate solution and poured into the beaker with ninhydrin, and stirred with a glass rod until no precipitate is formed at the bottom of the beaker, and the mixture is labeled as developer B.
3) And mixing the developing solution A and the developing solution B with the same volume milliliter number, and slowly dripping the developing solution A into the developing solution B to prepare the composite developing solution.
4) The prepared composite developing solution is added according to the proportion of 22 mul/cm2The concentration of the compound is uniformly dripped on the sticky surface of the transparent adhesive tape, and the transparent adhesive tape is naturally dried for 15 minutes to obtain the adhesive flexible fingerprint showing film with a showing reaction layer in the middle and the two ends remaining sticky.
The prepared adhesive flexible fingerprint display film is adhered to a fingerprint reserved area on a glass door, and the display reaction layer covers the fingerprint and is in direct contact with the fingerprint. The latent fingerprint on the glass door can be displayed by irradiating the glass door with an ultraviolet lamp for 10 minutes, as shown in figure 3.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (6)
1. A preparation method of a flexible fingerprint revealing film capable of being stuck is characterized by comprising the following steps:
1) placing silver nitrate in a beaker, mixing acetone and ethanol, pouring into the beaker, and ultrasonically oscillating for 5-20 minutes, wherein the mixed solution is marked as a developing solution A;
2) putting solid ninhydrin in a beaker, mixing acetone and ethyl acetate solution, pouring the mixture into the beaker, and stirring until no precipitate is formed at the bottom of the beaker, wherein the mixed solution is marked as a developing solution B;
3) taking a developing solution A and a developing solution B with the same volume, and dropwise adding the developing solution A into the developing solution B to prepare a composite developing solution;
4) the composite developing solution is mixed according to the proportion of 10-25 mu l/cm2The concentration of the adhesive is uniformly dripped on the sticky surface of the transparent adhesive tape, and the adhesive is naturally dried for at least 5 minutes, so that the adhesive flexible fingerprint showing film can be prepared.
2. The method for preparing an adhesive flexible fingerprint revealing film according to claim 1, wherein the ratio of the amount of silver nitrate, acetone and ethanol in step 1) is 0.2-0.8 g: 15-20 ml: 20-30 ml.
3. The method for preparing an attachable flexible fingerprint revealing film according to claim 1, wherein the ratio of the amounts of the solid ninhydrin, acetone and ethyl acetate in step 2) is 0.3-0.9 g: 5-15 ml.
4. The affixable flexible fingerprint presentation of claim 1The preparation method of the membrane is characterized in that the composite developing solution in the step 4) is prepared according to the proportion of 10-25 mul/cm2The concentration of the solution is uniformly dripped on a transparent adhesive tape.
5. An attachable flexible fingerprint revealing film prepared by the method according to any of claims 1 to 4 wherein said revealing film has a revealing reaction layer in the middle and adhesive properties at both ends.
6. The use of the attachable flexible fingerprint revealing film according to claim 5 for revealing a fingerprint, wherein the attachable flexible fingerprint revealing film is attached to an object having a fingerprint left thereon, and the revealing reaction layer is made to cover the fingerprint and to be in direct contact with the fingerprint; if the object is a permeable object, heating and reacting at the constant temperature of 60-90 ℃ for 10 seconds-10 minutes to display the latent fingerprint on the object; and if the object is a non-permeable object, placing the object under an ultraviolet lamp for irradiating for 1-20 minutes to display the latent fingerprint on the object.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010392545.7A CN111544007A (en) | 2020-05-11 | 2020-05-11 | Adhesive flexible fingerprint display film, preparation method and application |
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| CN202010392545.7A CN111544007A (en) | 2020-05-11 | 2020-05-11 | Adhesive flexible fingerprint display film, preparation method and application |
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| CN111544007A true CN111544007A (en) | 2020-08-18 |
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| CN202010392545.7A Pending CN111544007A (en) | 2020-05-11 | 2020-05-11 | Adhesive flexible fingerprint display film, preparation method and application |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107049331A (en) * | 2017-04-11 | 2017-08-18 | 周婧 | A kind of flexible composite of sandwich structure and its preparation method and application |
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- 2020-05-11 CN CN202010392545.7A patent/CN111544007A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107049331A (en) * | 2017-04-11 | 2017-08-18 | 周婧 | A kind of flexible composite of sandwich structure and its preparation method and application |
Non-Patent Citations (4)
| Title |
|---|
| 王文: "混合显现液对三种渗透性纸张上潜汗指印的显现", 《四川警察学院学报》 * |
| 王文: "硝酸银、茚三酮、502胶复合液显现潜汗指纹研究", 《四川警官高等专科学校学报》 * |
| 王春华: "《药学化学实验 2 第2版》", 31 January 2020, 化学出版社 * |
| 郭庆睿: "茚三酮-硝酸银混合显现法初探", 《刑事技术》 * |
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Application publication date: 20200818 |