CN107049331B - A kind of flexible composite of sandwich structure and its preparation method and application - Google Patents
A kind of flexible composite of sandwich structure and its preparation method and application Download PDFInfo
- Publication number
- CN107049331B CN107049331B CN201710232978.4A CN201710232978A CN107049331B CN 107049331 B CN107049331 B CN 107049331B CN 201710232978 A CN201710232978 A CN 201710232978A CN 107049331 B CN107049331 B CN 107049331B
- Authority
- CN
- China
- Prior art keywords
- sandwich structure
- flexible composite
- fingerprint
- flexible
- uniformly mixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Abstract
The invention belongs to forensic science field, in particular to the flexible composite of a kind of sandwich structure and its application.A kind of flexible composite of sandwich structure, preparation method include the following steps: for developer to be dissolved in ethyl alcohol, and emulsifier is dissolved in water, then the two is uniformly mixed and obtains reaction solution；Iron powder, water, active carbon, sodium chloride, super absorbent polymer, heat conductive silica gel are uniformly mixed and obtain spontaneous heating slurry；Reaction solution is dropped evenly to the one side of flexible base board, is dried, then spontaneous heating slurry is uniformly applied to the another side of flexible base board, it is dry, it can be obtained the flexible composite for the sandwich structure being made of conversion zone, flexible base board, spontaneous thermosphere.This flexible composite is placed on the object there are fingerprint and is made conversion zone and fingerprint tough, can quickly show latent fingerprint.The method of the present invention have the characteristics that it is easy to operate, low in cost, easy to carry, show quickly, without detriment to sample, there is very strong practicability.
Description
Technical field
The invention belongs to forensic science fields, and in particular to a kind of flexible composite of sandwich structure and its preparation side
Method and application.
Background technique
Fingerprint is the streakline of finger epidermis upper process, as a kind of inhereditary feature feature of the mankind, there is each one respectively to refer to
The characteristics such as different and unchangeable.Since its uniqueness, unchangeable property and convenience, fingerprint have become living things feature recognition
Important means.Fingerprint is also one of most important evidence in scene of a crime, can carry out establishing identity according to the feature of fingerprint, is determined
Suspect.After finger and object contact, sweat, grease etc. in finger are retained in object surface at branch, form meat
The sightless fingerprint of eye, i.e., latent fingerprint.In most cases, the fingerprint being retained on object surface is not easy to be found,
Therefore need to show latent fingerprint.
Traditional fingerprint manifestation method includes powder appearance method and chemical appearance method.In general, powder appearance method is applicable in
In impermeability object, chemical appearance method is suitable for permeability object.Chemical appearance method is by chemistry such as silver nitrate, ninhydrins
Reagent impregnates or smears object, show latent fingerprint.The effect that this method shows fingerprint is obvious, but chemistry examination simultaneously
The process of agent dip dyeing object can cause a degree of damage or influence to object, for example make the coloring of object surface background, draw
Play the printing ink diffusion on paper object, destroy writing etc., to bring negative effect to the offer of case clue.Another party
Face, conventional method show fingerprint using chemical reagent such as silver nitrate, ninhydrins and need to smoke in fumigation dispaly cabinet aobvious, and reaction is taken
Between it is longer, be unable to satisfy quickly detection and on-site test requirement.
Summary of the invention
The present invention provides a kind of flexible composites of sandwich structure, can quickly show latent fingerprint using it, and
Without detriment to sample.The present invention also provides application of the flexible composite of the sandwich structure in terms of fingerprint manifestation.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of flexible composite of sandwich structure, preparation method include the following steps:
1) developer and the ethyl alcohol ratio of 0.05~0.2:10 in mass ratio are uniformly mixed and obtain developer solution, emulsifier and
The water ratio of 0.05~0.3:5 in mass ratio is uniformly mixed and obtains emulsion, by developer solution and emulsion 7~12:1 in mass ratio
Ratio be uniformly mixed obtain reaction solution；
2) by iron powder, water, active carbon, sodium chloride, super absorbent polymer, heat conductive silica gel according to 56~62:24 of mass ratio~
25:4~6:3~5:1~2:8~10 ratio is uniformly mixed and obtains spontaneous heating slurry；
3) by the reaction solution according to 15~25 μ l/cm2Even concentration be added drop-wise to the one side of flexible base board, spontaneously dry
At least 10 minutes, conversion zone is formed, then by the spontaneous heating slurry according to 30~80 μ g/cm2Even concentration be applied to it is soft
Property substrate another side, spontaneously dry at least 10 minutes, form spontaneous thermosphere, can be obtained by conversion zone, flexible base board, spontaneous
The flexible composite of the sandwich structure of thermosphere composition；
In the technical solution, the developer can be ninhydrin, indandione rodenticide or 1,2- indandione.
The emulsifier can be polyvinyl alcohol, Macrogol 4000, Macrogol 6000, PEG 8000 or poly- second
Glycol 10000.
The super absorbent polymer can be starch graft acrylic acid polymer, starch graft acrylamide polymer, carboxylic
Methylcellulose grafted propylene acid polymer, hydroxyethyl cellulose graft acrylamide polymer, polyacrylic acid super absorbent are poly-
Close object or polyvinyl alcohol super absorbent polymer.
The heat conductive silica gel can be silicon carbide filled silicon rubber, aluminium nitride filled silicon rubber, boron nitride filled silicon rubber,
Alumina filled silicon rubber, zinc oxide filled silicon rubber or carbon nano-tube filled silicon rubber.
The flexible base board can be PET substrate or polyimide substrate.
Application of the flexible composite of sandwich structure described in a kind of in terms of fingerprint manifestation, by the sandwich
The flexible composite of structure is placed on the object there are fingerprint, and reacts conversion zone with fingerprint tough, at least 15 seconds downward,
The latent fingerprint on object can be shown.
The beneficial effects of the present invention are:
A kind of flexible composite of sandwich structure provided by the present invention, preparation method is simple, it is low in cost, carry
It is convenient, it is applied to fingerprint manifestation field, can quickly shows fingerprint, good developing effect, and without detriment to sample.This composite wood
Material has certain flexibility, can fit in object surface of various shapes, and spontaneous thermosphere is capable of providing certain temperature, enhances fingerprint
Show effect and reduce and shows required time.Compared with prior art, the method for the present invention fingerprint manifestation is easy to operate, does not need to set
Standby, it is fast to show speed, does not destroy sample, is applicable in that Object range is wide, can be used in quickly showing for fingerprint and shows with scene.
Detailed description of the invention
Fig. 1 is the fingerprint manifestation photo on the heat-sensitive paper in embodiment 1.
Fig. 2 is the fingerprint manifestation photo on the printing paper in embodiment 2.
Fig. 3 is the fingerprint manifestation photo on the newspaper in embodiment 3.
Specific embodiment
Below by specific embodiment, technical scheme of the present invention will be further explained in detail.It should be appreciated that this hair
Bright implementation is not limited by the following examples, and the accommodation in any form made to the present invention and/or changed will all be fallen
Enter the scope of the present invention.
Embodiment 1
1) ninhydrin and the ethyl alcohol ratio of 0.1:10 in mass ratio are uniformly mixed and obtain developer solution, polyethylene alcohol and water is pressed
The ratio of mass ratio 0.1:5 is uniformly mixed and obtains emulsion, and developer solution and the emulsion ratio of 9:1 in mass ratio are uniformly mixed
Obtain reaction solution；
2) by iron powder, water, active carbon, sodium chloride, starch graft acrylic acid polymer, silicon carbide filled silicon rubber according to matter
Ratio of the amount than 58:24:5:4:1:9, which is uniformly mixed, obtains spontaneous heating slurry；
3) by the reaction solution according to 20 μ l/cm2Even concentration be added drop-wise to PET substrate's
On one side, it spontaneously dries 20 minutes, conversion zone is formed, then by the spontaneous heating slurry according to 40 μ g/cm2Even concentration smear
It to the another side of PET substrate, spontaneously dries 20 minutes, forms spontaneous thermosphere, that is, obtain by reacting
The flexible composite for the sandwich structure that layer, flexible base board, spontaneous thermosphere form；
4) flexible composite of the sandwich structure is placed on the heat-sensitive paper there are fingerprint, and makes conversion zone court
Lower and fingerprint tough reacts 15 seconds, can show the latent fingerprint on heat-sensitive paper, as shown in Figure 1.
Embodiment 2
1) indandione rodenticide and the ethyl alcohol ratio of 0.12:10 in mass ratio are uniformly mixed and obtain developer solution, PEG 8000
It is uniformly mixed with the water ratio of 0.2:5 in mass ratio and obtains emulsion, by developer solution and the emulsion ratio of 10:1 in mass ratio
It is uniformly mixed and obtains reaction solution；
2) by iron powder, water, active carbon, sodium chloride, starch graft acrylamide polymer, alumina filled silicon rubber according to
The ratio of mass ratio 56:25:4:5:2:8 is uniformly mixed and obtains spontaneous heating slurry；
3) by the reaction solution according to 18 μ l/cm2Even concentration be added drop-wise to PET substrate's
On one side, it spontaneously dries 30 minutes, conversion zone is formed, then by the spontaneous heating slurry according to 50 μ g/cm2Even concentration smear
It to the another side of PET substrate, spontaneously dries 30 minutes, forms spontaneous thermosphere, that is, obtain by reacting
The flexible composite for the sandwich structure that layer, flexible base board, spontaneous thermosphere form；
4) flexible composite of the sandwich structure is placed on the printing paper there are fingerprint, and makes conversion zone court
Lower and fingerprint tough reacts 40 seconds, can show the latent fingerprint on printing paper, as shown in Figure 2.
Embodiment 3
1) 1,2- indandione and the ethyl alcohol ratio of 0.08:10 in mass ratio are uniformly mixed and obtain developer solution, poly- second two
Alcohol 6000 and the water ratio of 0.1:5 in mass ratio are uniformly mixed and obtain emulsion, by developer solution and emulsion 8:1 in mass ratio
Ratio is uniformly mixed and obtains reaction solution；
2) by iron powder, water, active carbon, sodium chloride, polyacrylic acid super absorbent polymer, zinc oxide filled silicon rubber according to
The ratio of mass ratio 57:24:5:3:1:10 is uniformly mixed and obtains spontaneous heating slurry；
3) by the reaction solution according to 23 μ l/cm2Even concentration be added drop-wise to the one side of polyimide substrate, spontaneously dry
40 minutes, conversion zone is formed, then by the spontaneous heating slurry according to 70 μ g/cm2Even concentration be applied to it is polyimide-based
The another side of plate spontaneously dries 40 minutes, forms spontaneous thermosphere, that is, obtains and be made of conversion zone, flexible base board, spontaneous thermosphere
The flexible composite of sandwich structure；
4) flexible composite of the sandwich structure is placed on the newspaper there are fingerprint, and makes conversion zone downward
With fingerprint tough, reacts 1 minute, the latent fingerprint on newspaper can be shown, as shown in Figure 3.
Above-mentioned embodiment is only a preferred solution of the present invention, not the present invention is made in any form
Limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (5)
1. a kind of preparation method of the flexible composite of sandwich structure, which comprises the steps of:
1) developer and the ethyl alcohol ratio of 0.05~0.2:10 in mass ratio are uniformly mixed and obtain developer solution, by emulsifier and water
The ratio of 0.05~0.3:5 is uniformly mixed and obtains emulsion in mass ratio, then by developer solution and emulsion 7~12:1 in mass ratio
Ratio be uniformly mixed obtain reaction solution；
2) by iron powder, water, active carbon, sodium chloride, super absorbent polymer, heat conductive silica gel according to 56~62:24 of mass ratio~25:4
~6:3~5:1~2:8~10 ratio is uniformly mixed and obtains spontaneous heating slurry；
3) by the reaction solution according to 15~25 μ l/cm2Even concentration be added drop-wise to the one side of flexible base board, spontaneously dry at least
10 minutes, conversion zone is formed, then by the spontaneous heating slurry according to 30~80 μ g/cm2Even concentration be applied to flexible base
The another side of plate spontaneously dries at least 10 minutes, forms spontaneous thermosphere, can be obtained by conversion zone, flexible base board, spontaneous thermosphere
The flexible composite of the sandwich structure of composition；
The developer is ninhydrin, indandione rodenticide or 1,2- indandione,
The emulsifier is polyvinyl alcohol, Macrogol 4000, Macrogol 6000, PEG 8000 or polyethylene glycol
10000,
The super absorbent polymer is starch graft acrylic acid polymer, starch graft acrylamide polymer, carboxymethyl fibre
Tie up plain grafted propylene acid polymer, hydroxyethyl cellulose graft acrylamide polymer, polyacrylic acid super absorbent polymer or
Polyvinyl alcohol super absorbent polymer.
2. a kind of preparation method of the flexible composite of sandwich structure according to claim 1, which is characterized in that institute
The heat conductive silica gel stated is silicon carbide filled silicon rubber, aluminium nitride filled silicon rubber, boron nitride filled silicon rubber, alumina filled silicon
Rubber, zinc oxide filled silicon rubber or carbon nano-tube filled silicon rubber.
3. a kind of preparation method of the flexible composite of sandwich structure according to claim 1, which is characterized in that institute
The flexible base board stated is PET substrate or polyimide substrate.
4. a kind of flexible composite of sandwich structure, which is characterized in that the material is described in any item by claim 1-3
Method is prepared.
5. a kind of application of flexible composite of sandwich structure as claimed in claim 4 in terms of fingerprint manifestation, special
Sign is, the flexible composite of the sandwich structure is placed on the object there are fingerprint, and make conversion zone downward with
Fingerprint tough reacts at least 15 seconds, can show the latent fingerprint on object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710232978.4A CN107049331B (en) | 2017-04-11 | 2017-04-11 | A kind of flexible composite of sandwich structure and its preparation method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710232978.4A CN107049331B (en) | 2017-04-11 | 2017-04-11 | A kind of flexible composite of sandwich structure and its preparation method and application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107049331A CN107049331A (en) | 2017-08-18 |
| CN107049331B true CN107049331B (en) | 2019-11-15 |
Family
ID=59601788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710232978.4A Active CN107049331B (en) | 2017-04-11 | 2017-04-11 | A kind of flexible composite of sandwich structure and its preparation method and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107049331B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111544007A (en) * | 2020-05-11 | 2020-08-18 | 浙江警察学院 | Adhesive flexible fingerprint display film, preparation method and application |
| CN113925500B (en) * | 2021-10-15 | 2023-09-29 | 沈阳理工大学 | Fingerprint developing powder and preparation method and application thereof |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4190056A (en) * | 1977-10-31 | 1980-02-26 | General Medical Company | Method and means for recording sweat gland activity |
| GB0516272D0 (en) * | 2005-08-09 | 2005-09-14 | Univ Sunderland | Hydrophobic silica nanoparticles |
| US8760614B2 (en) * | 2008-03-11 | 2014-06-24 | Rolic Ltd. | Optical biometric security element |
| CN101792147B (en) * | 2010-01-12 | 2012-05-09 | 清华大学深圳研究生院 | Surface modification method of silica particles and method for displaying latent fingerprints |
| CN103284728B (en) * | 2013-05-04 | 2015-07-22 | 中国科学院长春应用化学研究所 | Application of perylene derivative |
| WO2015200286A1 (en) * | 2014-06-27 | 2015-12-30 | Ohio University | Systems using fingerprint images as diagnostic detection systems for type 2 diabetes |
| GB201416602D0 (en) * | 2014-09-19 | 2014-11-05 | Univ Central Lancashire | (Fingerprint) powder composition |
| CN105615892B (en) * | 2014-10-31 | 2018-09-21 | 青岛农业大学 | A kind of novel silver for developing latent finger printss shows reagent and its preparation process |
| CN105411598B (en) * | 2015-11-30 | 2018-08-24 | 同济大学 | A kind of TiO2/ C strengthens fingerprint manifestation magnetic powder and the preparation method and application thereof |
| CN105975962B (en) * | 2016-06-29 | 2018-11-23 | 西南大学 | A kind of integral method for realizing latent print development and transfer based on the separation of poly-dopamine film interface |
| CN106175784A (en) * | 2016-07-08 | 2016-12-07 | 同济大学 | A kind of white magnetic fingerprint manifestation powder and preparation method thereof |
| CN106279791A (en) * | 2016-08-05 | 2017-01-04 | 湖北科技学院 | A kind of latent fingerprint extracts/manifests gel compound membrane and radiation preparation method thereof |
-
2017
- 2017-04-11 CN CN201710232978.4A patent/CN107049331B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107049331A (en) | 2017-08-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107049331B (en) | A kind of flexible composite of sandwich structure and its preparation method and application | |
| ATE492810T1 (en) | METHOD FOR PRODUCING A REACTIVE TEST STRIP | |
| CN109163825A (en) | It is a kind of breathe, the preparation method of degradable wearable flexible pressure-sensitive sensor | |
| CN105411599B (en) | A method of showing latent fingerprint using cellulose membrane and aqueous dye solutions | |
| Huang et al. | In situ polymerization of 2-hydroxyethyl methacrylate (HEMA) and 3-(methacryloxy) propyltrimethoxysilane (MAPTES) in poplar cell wall to enhance its dimensional stability | |
| FI832322L (en) | POLYMERFOERENING OCH DERAS ANVAENDNING VID FRAMSTAELLNING AV BINDEMEDEL, BELAEGGNINGSMATERIAL OCH LSAMT DESSA BELAGDA ELLER IMPREGNERADE SUBSTRAT | |
| Zhang et al. | An environmentally friendly fluorine-free sandwich coating based on a nonwoven fabric for efficient unidirectional water transport | |
| CN105286877B (en) | It is a kind of in the positive and negative method for showing latent fingerprint of different hydrophilic and hydrophobic material surfaces | |
| US10552659B2 (en) | Latent fingerprint development on porous surfaces | |
| GB1166163A (en) | Imitation Leather | |
| CN109068413A (en) | The preparation method of graphite composite film, the graphite composite film being obtained by this method and its application | |
| JP4355405B2 (en) | Ninhydrin-containing pressure-sensitive adhesive composition and sheet for fingerprint detection, or for collecting handprint or footprint | |
| CN106667497A (en) | Method for simultaneously transferring and demonstrating latent fingerprints by utilizing hydrophilic membrane and water solution | |
| US8025852B2 (en) | Lifting and preserving bloody impressions for law enforcement | |
| Bokova et al. | Electrospinning as promising technology for expanding the assortment of fibre-reinforced porous composite materials and coatings | |
| CN100580172C (en) | Leather-like sheet material and process for producing the same | |
| CN207400742U (en) | A kind of gel-type impression of the hand extracts film | |
| Goodenough et al. | Cell junctions and intercellular communication | |
| CN110042675B (en) | Microfiber bass full-aqueous post-treatment method | |
| Zarate et al. | Lifting, Enhancing, and Preserving Blood and Other Proteinaceous Impressions Using Zar-Pro Fluorescent Lifters. | |
| TW487734B (en) | Waterproof PU hogskin and method for making the same | |
| FR2358431A1 (en) | THIN SHEET COPOLYMER FOR SURFACES DECORATION | |
| JPS5964583A (en) | Manufacture of inorganic board | |
| Zakhera et al. | Functional morphology and shell microstructure of some Upper Cretaceous oysters from the Eastern Desert of Egypt | |
| CN114106673A (en) | Shell, shell preparation method and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200602 Address after: Hangzhou City, Zhejiang Province, Binjiang District Puyan street 311800 Waterfront Road 555 Patentee after: ZHEJIANG POLICE College Address before: Hangzhou City, Zhejiang Province, Binjiang District Puyan street 311800 Waterfront Road 555 Patentee before: Zhou Jing |
|
| TR01 | Transfer of patent right |