CN111363471A - Artificial fingerprint liquid and preparation method and application thereof - Google Patents
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Abstract
An artificial fingerprint liquid and a preparation method and application thereof, comprising the following steps: mixing lactic acid, pure acetic acid and deionized water and carrying out ultrasonic treatment; adding sodium chloride, sodium dihydrogen phosphate and urea, performing ultrasonic treatment, and continuously mechanically stirring to obtain clear liquid; adding PDMS, an organic solvent, squalene, cholesterol and stearic acid into the clear liquid, performing ultrasonic treatment, and continuously mechanically stirring to obtain an artificial fingerprint liquid mother solution; the PDMS is hydroxyl-terminated polydimethylsiloxane, and the organic solvent is propylene glycol methyl ether; and (3) adding the nano particles into the mother liquor, and carrying out continuous mechanical stirring after ultrasonic treatment to obtain the artificial fingerprint liquid. The binding force between the artificial fingerprint liquid and the surface of the substrate is similar to that between the human fingerprint and the substrate, and the artificial fingerprint liquid has better stability. After the artificial fingerprint liquid is pressed on the surface of the substrate for a plurality of weeks, the fingerprints can still be observed very easily, and the macroscopic observation is similar to the shape of human fingerprints pressed for a plurality of weeks.
Description
Technical Field
The invention belongs to the technical field of new chemical materials, and particularly relates to an artificial fingerprint liquid and a preparation method and application thereof.
Background
Glass is widely applied to products such as mobile phone screens, display screens, optical lenses and the like, but the problems of fingerprint (skin grease) residue and the like often occur in the using process. These residues not only affect the aesthetic appearance of the glass surface, but also the clarity and gloss of the glass surface. Therefore, more and more researchers have conducted research on the fingerprint resistance of the glass surface. The fingerprint resistance characteristic enables the surface of the material to have self-cleaning or easy-to-clean characteristics, and an attractive interactive interface can be provided for a user.
Despite the advances made in the fingerprint resistance characteristics of material surfaces, the quantification of human fingerprint residues on surfaces has not been fully studied, and fingerprint testing by most researchers is qualitative and subjective, since the composition of human fingerprint residues varies widely under different environmental conditions and different skin conditions, resulting in large errors in the characterization of the fingerprint resistance properties of material surfaces. The fingerprint liquid used for the fingerprint resistance test in the current literature report mainly considers that the surface energy of the fingerprint liquid is similar to the human body fluid in the real fingerprint, but the composition of the fingerprint liquid is greatly different from the human body fingerprint. For example, Linda Y.L. Wu et al (Wu LY L, Ngian S K, Chen Z, et al, Quantitative test method for evaluation of anti-agent-fingerprint property of coated surfaces [ J ]. Applied Surface Science,2011, 257(7): 2965) -2969.) utilize PDMS, propylene glycol methyl ether, nano silicon dioxide particles and other substances to make the Surface of the artificial fingerprint liquid approach the body fluid in the real fingerprint, and the contact angle of the artificial fingerprint liquid is more than 90 degrees, so that the Surface can completely prevent fingerprints. This is not the case in actual tests, and the artificial fingerprint liquid composition and the human body fluid composition in the real fingerprint are very different, so that the test result is deviated. Under the condition of ensuring the surface energy, viscosity and nano-particle content, the invention adds the substances such as squalene, cholesterol, stearic acid and the like, so that the surface energy and the components of the artificial fingerprint liquid are closer to the body fluid in the real fingerprint, the human fingerprint can be simulated more truly, the cost is low, and the preparation is simple.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the problem that fingerprint residues are difficult to quantify in the existing research process of researchers on the fingerprint resistance of the surface of a material, so that a large deviation exists in a characterization result, the artificial fingerprint liquid, the preparation method and the application thereof quantize the fingerprint residues in the fingerprint resistance test process, and can be used for evaluating the fingerprint resistance of the material.
The technical scheme is as follows: a preparation method of an artificial fingerprint liquid is characterized by comprising the following steps: (1) mixing 3-5 parts of lactic acid with the mass concentration of 85%, 5-7 parts of pure acetic acid and 40-43 parts of deionized water, and carrying out ultrasonic treatment for 3-5min to obtain a solution with the pH value of 3-6; (2) adding 1 part of sodium chloride, 1 part of sodium dihydrogen phosphate and 2-3 parts of urea into the clear solution obtained in the step (1), crushing for 10-20 seconds by using a cell crusher at the power of 130w, ultrasonically dispersing the liquid for 3-5min, and continuously mechanically stirring for 4-6h to obtain clear liquid; (3) taking 3-5 parts of the clarified liquid obtained in the step (2), adding 1-5 parts of PDMS, 2-5 parts of organic solvent, 1-2 parts of squalene, 1-2 parts of cholesterol and 2-3 parts of stearic acid, carrying out ultrasonic treatment for 3-5min, and continuously mechanically stirring for 5-10h to obtain an artificial fingerprint liquid mother solution; the PDMS is hydroxyl-terminated polydimethylsiloxane, and the organic solvent is propylene glycol methyl ether; (4) and (3) adding the mother liquor obtained in the step (3) into nanoparticles with the particle diameter of 4-70nm until the mass fraction of the nanoparticles is 0.1-3%, crushing for 10-20 seconds by using a cell crusher at the power of 130w, ultrasonically dispersing the liquid for 3-5min, and continuously mechanically stirring for 1-2h to obtain the artificial fingerprint liquid.
Preferably, the nanoparticles are silica, diatomaceous earth or alumina powder.
The artificial fingerprint liquid prepared by the preparation method.
The surface energy of the artificial fingerprint liquid is 30-40mJ/m2The surface energy of the real human fingerprint liquid is 20-50mJ/m2。
The application of the artificial fingerprint liquid in detecting the fingerprint resistance of the material.
The contact angle of the water drops on the glass surface after the artificial fingerprint liquid is coated is 36-42 degrees, the contact angle of the water drops on the aluminum alloy sheet surface after the artificial fingerprint liquid is coated is 40-42 degrees, and the contact angle of the water drops on the plastic surface after the artificial fingerprint liquid is coated is 38-41 degrees.
The application comprises the following specific steps: mechanically stirring the fingerprint solution for 15min, dipping a rubber fingerprint seal with simulated human thumb fingerprint at the wetted end, and keeping the pressure at 5N/cm2And (3) pressing the seal to the surface of a substrate to be tested under the condition, standing for 1-2s, and then taking down the seal to perform fingerprint resistance performance characterization, wherein the size of the end part of the seal is a square with the size of 1cm × 1 cm.
The artificial fingerprint liquid simulates that when a finger which just contacts dust presses fingerprint residues, the mass fraction of the nano particles is increased; and when the clean finger is simulated to press the fingerprint residues, the mass fraction of the nano particles is reduced.
Has the advantages that: (1) the preparation method provided by the invention has the advantages of simple process, easily obtained raw materials and low cost; (2) the contact angle of 5 microliter deionized water on the surface of glass pressed by the artificial fingerprint liquid prepared by the invention is 36-42 degrees. The contact angle of 5 microliter of deionized water on the surface of an aluminum sheet pressed by the artificial fingerprint liquid is 40-42 degrees, and is close to the contact angle of water on the human fingerprint. (3) The invention uses nano particles to replace substances such as dirt, skin care product residues, sterols and the like in human fingerprint residues on the surface of the material, and uses artificial sweat to replace substances such as glycerin, fatty acid and the like in the human fingerprint residues. And judging whether the artificial fingerprint liquid is representative or not by using the wettability of the water drops on the surface of the fingerprint liquid and combining optical microscope observation as an evaluation criterion. (4) The pressing effect of the human fingerprints on the surface of the substrate under different conditions can be simulated through the addition amount of the nano particles. If the hand is just washed clean, the fingerprint residue is little, and the solid content of the nano particles can be properly reduced during simulation; the solid content of the nanoparticles can be increased appropriately after some dirt is touched or the skin care product is applied, while the ultrasonication and mechanical agitation times are extended appropriately. (5) The binding force between the artificial fingerprint liquid and the surface of the substrate is similar to that between the human fingerprint and the substrate, and the artificial fingerprint liquid has better stability. The artificial fingerprint liquid can still be very easily observed in a plurality of weeks after the surface of the substrate is pressed, and the liquid of the fingerprint is basically not found but the solid nanometer is still existed through the observation of an optical microscope. Macroscopically, the shape is similar to the shape of a human fingerprint after being pressed for a plurality of weeks. (6) The traditional fingerprint test uses human fingers to press, and different test persons, different pressure degrees, different test time periods and the like can all influence the fingerprint residual condition. The fingerprint resistance of the material is more strictly represented by quantifying the fingerprint liquid, the pressing area and the pressure.
Drawings
FIG. 1 is a photograph of the residue of the artificial fingerprint liquid obtained in example 2 taken at 100 Xmagnification by means of an optical microscope;
FIG. 2 is a 1.5 times magnified photograph of the industrial camera for artificial fingerprint liquid residue in example 2;
FIG. 3 is a photograph of the artificial fingerprint liquid residue obtained in example 7 taken at 100 Xmagnification by means of an optical microscope;
FIG. 4 is a 4.5 times magnified photograph of the industrial camera for artificial fingerprint liquid residue in example 7;
FIG. 5 is a photograph magnified 1.5 times by the industrial camera for artificial fingerprint liquid residue in example 7.
Detailed Description
Example 1
At room temperature, 3 parts of lactic acid with the mass concentration of 85%, 5 parts of pure acetic acid and 40 parts of deionized water solution are subjected to ultrasonic dispersion and mixing for 5min, 10 parts of sodium chloride, 3 parts of urea and 10 parts of disodium hydrogen phosphate are added, a cell crusher is used for crushing for 20 seconds at the power of 130w, the liquid is subjected to ultrasonic dispersion for 5min, and then the mechanical stirring is carried out for 30min, so as to obtain clear liquid. The liquid is characterized by a pH value between 3 and 5. And (3) dropwise adding 9 parts of propylene glycol methyl ether, 9 parts of PDMS, 1 part of squalene, 1 part of cholesterol and 2 parts of stearic acid into the 12 parts of liquid, and mechanically stirring for 5 hours to obtain the artificial fingerprint liquid mother liquor. And (3) adding 10 parts of the solution into nano silica particles with the diameter of 4-70nm until the mass fraction of the nano particles is 1%, crushing the mixture for 20 seconds by using a cell crusher at the power of 130w, ultrasonically dispersing the mixture for 5min, and mechanically stirring the mixture for 2h to obtain the artificial fingerprint solution. The artificial fingerprint liquid obtained by the method is low in price, and can simulate human fingerprint pressing residues under general conditions. Compared with the fingerprint liquid for testing the fingerprint resistance of the material mentioned in the literature, the composition is closer to the human body fluid, and the dirt residue in the fingerprint can be simulated more truly.
Example 2
The artificial fingerprint solution of example 1 was mechanically stirred for 15min and poured evenly onto the sponge in the stamp groove. Dipping the artificial fingerprint liquid in the seal groove by using a fingerprint seal with the area of 1cm2Left and right. Pressing the fingerprint seal on the glass substrate, and applying 5N pressure on the fingerprint seal to make the pressure reach 5N/cm2Left and right, stay for 2 s. The contact angle of the water drop on the artificial fingerprint liquid residue is measured to be 36-42 degrees by a contact angle measuring instrument. After 30min, the residual condition of the substrate fingerprint is observed by an optical microscope. This test method is suitable for general fingerprint resistance tests, and the pressing method in this embodiment can be used when testing the fingerprint resistance of a material. Fig. 1 and 2 show the fingerprint residual in example 2. As can be seen from the graph, compared with FIG. 3, the fingerprint stain in FIG. 1 is more uniformly dispersed, the condition that contaminants are obviously and intensively distributed does not occur, the distribution of sebum, dirt and the like in real fingerprint residues can be simulated more reasonably, and the subsequent fingerprint resistance characterization is more reasonable.
Example 3
At room temperature, 4 parts of lactic acid with the mass concentration of 85%, 5 parts of pure acetic acid and 45 parts of deionized water solution are subjected to ultrasonic dispersion and mixing for 5min, then 10 parts of sodium chloride, 3 parts of urea and 10 parts of disodium hydrogen phosphate are added, a cell crusher is used for crushing for 20 seconds at the power of 130w, then liquid is subjected to ultrasonic dispersion for 5min, and mechanical stirring is carried out for 30min, so that clear liquid is obtained. The liquid is characterized by a pH value between 3 and 5. And (3) dropwise adding 2 parts of propylene glycol methyl ether, 2 parts of PDMS, 1 part of squalene, 2 parts of cholesterol and 3 parts of stearic acid into the 10 parts of liquid, and mechanically stirring for 5 hours to obtain the artificial fingerprint liquid mother solution. And (3) adding 10 parts of the solution into nano silica particles with the diameter of 4-70nm until the mass fraction of the nano particles is 1%, crushing the mixture for 20 seconds by using a cell crusher at the power of 130w, ultrasonically dispersing the mixture for 5min, and mechanically stirring the mixture for 2h to obtain the artificial fingerprint solution.
Example 4
At room temperature, 3 parts of lactic acid with the mass concentration of 85%, 5 parts of pure acetic acid and 45 parts of deionized water solution are subjected to ultrasonic dispersion and mixing for 5min, 10 parts of sodium chloride, 3 parts of urea and 10 parts of disodium hydrogen phosphate are added, a cell crusher is used for crushing for 20 seconds at the power of 130w, the liquid is subjected to ultrasonic dispersion for 5min, and then the mechanical stirring is carried out for 30min, so as to obtain clear liquid. The liquid is characterized by a pH value between 3 and 5. And (3) dropwise adding 9 parts of propylene glycol methyl ether, 9 parts of PDMS, 1 part of squalene, 1 part of cholesterol and 3 parts of stearic acid into the 12 parts of artificial sweat, and mechanically stirring for 5 hours to obtain the artificial fingerprint liquid mother solution. And (3) taking 10 parts of the solution, adding nano kieselguhr particles with the diameter of 50-70nm until the mass fraction is 1%, crushing for 20 seconds by using a cell crusher at the power of 130w, and performing liquid ultrasonic dispersion for 5min to obtain the artificial fingerprint liquid.
Example 5
At room temperature, 3 parts of lactic acid with the mass concentration of 85%, 5 parts of pure acetic acid and 45 parts of deionized water solution are subjected to ultrasonic dispersion and mixing for 5min, 8 parts of sodium chloride, 4 parts of urea and 9 parts of disodium hydrogen phosphate are added, a cell crusher is used for crushing for 20 s at the power of 130w, the liquid is subjected to ultrasonic dispersion for 5min, and then the mechanical stirring is carried out for 30min, so as to obtain clear liquid. The liquid is characterized by a pH value between 3 and 5. And (3) dropwise adding 2 parts of propylene glycol methyl ether, 2 parts of PDMS, 1 part of squalene, 1 part of cholesterol and 2 parts of stearic acid into the 10 parts of artificial sweat, and mechanically stirring for 5 hours to obtain the artificial fingerprint liquid mother solution. And (3) adding 10 parts of the solution into nano kieselguhr particles with the diameter of 50-70nm until the mass fraction is 1%, crushing for 20 seconds by using a cell crusher at the power of 130w, performing liquid ultrasonic dispersion for 5min, and mechanically stirring for 2h to obtain the artificial fingerprint liquid.
Example 6
The artificial fingerprint solution of example 5 was mechanically stirred for 15min and poured evenly onto the sponge in the stamp groove. Dipping the artificial fingerprint liquid in the seal groove by using a fingerprint seal with the area of 1cm2Left and right. Pressing the fingerprint seal on the glass substrate, and applying 5N weight on the fingerprint seal to make the pressure reach 5N/cm2Left and right, stay for 2 s. By usingThe contact angle measuring instrument measures that the residual contact angle of the water drop in the artificial fingerprint liquid is 45-52 degrees. After 30min, the residual condition of the substrate fingerprint is observed by an optical microscope.
Example 7
(1) At room temperature, 3 parts of lactic acid with the mass concentration of 85%, 5 parts of pure acetic acid and 45 parts of deionized water solution are subjected to ultrasonic dispersion and mixing for 5min, 8 parts of sodium chloride, 4 parts of urea and 9 parts of disodium hydrogen phosphate are added, a cell crusher is used for crushing for 20 s at the power of 130w, the liquid is subjected to ultrasonic dispersion for 5min, and then the mechanical stirring is carried out for 30min, so as to obtain clear liquid. The liquid is characterized by a pH value between 3 and 5. And (3) dropwise adding 2 parts of propylene glycol methyl ether, 2 parts of PDMS, 2 parts of squalene, 2 parts of cholesterol and 3 parts of stearic acid into the 10 parts of artificial sweat, and mechanically stirring for 5 hours to obtain the artificial fingerprint liquid mother solution. And (2) adding 10 parts of the solution into nano silicon dioxide particles with the diameter of 50-70nm until the mass fraction is 2.5%, crushing the mixture for 20 seconds by using a cell crusher at the power of 130w, ultrasonically dispersing the mixture for 5min, and mechanically stirring the mixture for 2h to obtain the artificial fingerprint solution. The situation can simulate the situation that the finger is polluted by dust or the finger is pressed and remained when more stains are generated.
(2) And (3) uniformly pouring the artificial fingerprint liquid in the step (1) onto sponge in the seal groove. Dipping the artificial fingerprint liquid in the seal groove by using a fingerprint seal with the area of 1cm2Left and right. Pressing the fingerprint seal on the glass substrate, and applying 5N pressure on the fingerprint seal to make the pressure reach 5N/cm2Left and right, stay for 2 s. The contact angle of the water drop on the artificial fingerprint liquid residue is measured to be 51-53 degrees by a contact angle measuring instrument. After 30min, the residual condition of the substrate fingerprint is observed by an optical microscope. Fig. 3, 4 and 5 show the fingerprint residues in example 7. Compared with the attached figure 1, the content of nano silicon dioxide in the fingerprint liquid is increased, so that the simulated fingerprint pressing stains are more remained and distributed more intensively, and the condition that the finger is stained with dust or the fingerprint pressing residues are more can be simulated.
Claims (8)
1. A preparation method of an artificial fingerprint liquid is characterized by comprising the following steps: (1) mixing 3-5 parts of lactic acid with the mass concentration of 85%, 5-7 parts of pure acetic acid and 40-43 parts of deionized water, and carrying out ultrasonic treatment for 3-5min to obtain a solution with the pH value of 3-6; (2) adding 1 part of sodium chloride, 1 part of sodium dihydrogen phosphate and 2-3 parts of urea into the clear solution obtained in the step (1), crushing for 10-20 seconds by using a cell crusher at the power of 130w, ultrasonically dispersing the liquid for 3-5min, and continuously mechanically stirring for 4-6h to obtain clear liquid; (3) taking 3-5 parts of the clarified liquid obtained in the step (2), adding 1-5 parts of PDMS, 2-5 parts of organic solvent, 1-2 parts of squalene, 1-2 parts of cholesterol and 2-3 parts of stearic acid, carrying out ultrasonic treatment for 3-5min, and continuously mechanically stirring for 5-10h to obtain an artificial fingerprint liquid mother solution; the PDMS is hydroxyl-terminated polydimethylsiloxane, and the organic solvent is propylene glycol methyl ether; (4) and (3) adding the mother liquor obtained in the step (3) into nanoparticles with the particle diameter of 4-70nm until the mass fraction of the nanoparticles is 0.1-3%, crushing for 10-20 seconds by using a cell crusher at the power of 130w, ultrasonically dispersing the liquid for 3-5min, and continuously mechanically stirring for 1-2h to obtain the artificial fingerprint liquid.
2. The artificial fingerprint liquid and the preparation method thereof according to claim 1, wherein the nanoparticles are silica, diatomaceous earth or alumina powder.
3. The artificial fingerprint liquid prepared by the preparation method of claim 1 or 2.
4. The artificial fingerprint fluid as claimed in claim 3, wherein the surface energy of the artificial fingerprint fluid is 30-40mJ/m2The surface energy of the real human fingerprint liquid is 20-50mJ/m2。
5. Use of the artificial fingerprint fluid according to claim 3 in the detection of fingerprint resistance of materials.
6. The application of claim 5, wherein the contact angle of water drops on the glass surface after the artificial fingerprint liquid is coated is 36-42 degrees, the contact angle of water drops on the aluminum alloy sheet surface after the artificial fingerprint liquid is coated is 40-42 degrees, and the contact angle of water drops on the plastic surface after the artificial fingerprint liquid is coated is 38-41 degrees.
7. The application of claim 5, wherein the application comprises the following specific steps: mechanically stirring the fingerprint solution for 15min, dipping a rubber fingerprint seal with simulated human thumb fingerprint at the wetted end, and keeping the pressure at 5N/cm2And (3) pressing the seal to the surface of a substrate to be tested under the condition, standing for 1-2s, and then taking down the seal to perform fingerprint resistance performance characterization, wherein the size of the end part of the seal is a square with the size of 1cm × 1 cm.
8. The use according to claim 5, wherein the artificial fingerprint fluid simulates the situation that when a finger which just contacts dust presses the fingerprint residue, the mass fraction of the nanoparticles is increased; and when the clean finger is simulated to press the fingerprint residues, the mass fraction of the nano particles is reduced.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115717024A (en) * | 2022-11-04 | 2023-02-28 | 江南大学 | Multifunctional artificial fingerprint and preparation method thereof |
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| US20080311613A1 (en) * | 2007-06-14 | 2008-12-18 | The Government Of The U.S.A. As Represented By The Secretary Of The Dept. Of Health & Human Services | Artificial skin surface film liquids |
| JP2016150951A (en) * | 2015-02-16 | 2016-08-22 | 富士通株式会社 | Artificial fingerprint liquid, and fingerprint resistance evaluation method |
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2020
- 2020-03-30 CN CN202010239775.XA patent/CN111363471A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080311613A1 (en) * | 2007-06-14 | 2008-12-18 | The Government Of The U.S.A. As Represented By The Secretary Of The Dept. Of Health & Human Services | Artificial skin surface film liquids |
| JP2016150951A (en) * | 2015-02-16 | 2016-08-22 | 富士通株式会社 | Artificial fingerprint liquid, and fingerprint resistance evaluation method |
| CN108226439A (en) * | 2017-12-22 | 2018-06-29 | 苏州瑞奇丽新材料有限公司 | A kind of synthetic perspiration and preparation method thereof |
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| WU LY L 等: "Quantitative test method for evaluation of anti-fingerprint property of coated surfaces", 《APPLIED SURFACE SCIENCE》 * |
| 杨瑞琴: "《纳米技术与潜指纹显现》", 30 September 2016, 中国人民公安大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115717024A (en) * | 2022-11-04 | 2023-02-28 | 江南大学 | Multifunctional artificial fingerprint and preparation method thereof |
| CN115717024B (en) * | 2022-11-04 | 2023-08-08 | 江南大学 | Multifunctional artificial fingerprint and preparation method thereof |
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