CN111705431A - Preparation method of water-soluble nano paper and application of water-soluble nano paper in fingerprint structure acquisition - Google Patents
Preparation method of water-soluble nano paper and application of water-soluble nano paper in fingerprint structure acquisition Download PDFInfo
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
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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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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0015—Electro-spinning characterised by the initial state of the material
- D01D5/003—Electro-spinning characterised by the initial state of the material the material being a polymer solution or dispersion
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/0007—Electro-spinning
- D01D5/0061—Electro-spinning characterised by the electro-spinning apparatus
- D01D5/0076—Electro-spinning characterised by the electro-spinning apparatus characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
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- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/4309—Polyvinyl alcohol
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Abstract
The invention belongs to the technical field of superfine fiber material preparation, and particularly relates to a preparation method of water-soluble nano paper and application of the water-soluble nano paper in fingerprint structure acquisition. The preparation method of the water-soluble nano paper comprises the following steps: (1) dissolving a water-soluble polymer in water to prepare an aqueous solution of the water-soluble polymer; (2) and depositing the water solution of the water-soluble polymer on a roller covered with an aluminum foil by using an electrostatic spinning method to obtain the water-soluble nano paper. The water-soluble nano paper obtained by the method is applied to fingerprint structure acquisition. The application process is to lightly press the surface of the water-soluble nano paper by using a finger to obtain the water-soluble nano paper with the fingerprint structure. The method provided by the invention is based on the advantages of the electrostatic spinning fibers, the nano paper capable of collecting fingerprints is obtained in one step, the preparation condition is mild, the operation is simple, the repeatability is good, and the universality is strong. The structure of the fingerprint can be completely and really collected by directly pressing the nanometer paper with a finger in the application process.
Description
Technical Field
The invention belongs to the technical field of superfine fiber material preparation, and particularly relates to a preparation method of water-soluble nano paper and application of the water-soluble nano paper in fingerprint structure acquisition.
Background
Fingerprints are formed by certain raised parts of the epidermis of an individual, which are generated by the co-action of genes and the environment and have unique and lasting characteristics; these features enable them to serve personal identification in a variety of practical applications such as criminal investigation, rights control and information encryption. Fingerprints can be generally classified into three levels by three-level classification, and the primary structure is as follows: the flow direction of the lines, the central patterns and the triangular areas; the secondary structure is as follows: local fine structures of mastoid streak lines, broken point areas of streak line paths or ridges; the tertiary structure is as follows: sweat pores, ridge line edge morphology, fine dot lines, scars, and the like.
Generally, when a finger touches the substrate, secretions from the skin surface are transferred to the substrate. Most fingerprints are not easily observed by the naked eye, and most of the fingerprints are not easily observed and have secondary and tertiary structures. These fingerprints not only reproduce the physical characteristics of the individual ridges, but also contain non-uniform chemical components. These components are secreted primarily by natural secretory glands, such as eccrine sweat and sebaceous glands. Analysis of these fingerprint compositions can provide a large amount of information. At present, methods for collecting fingerprint structures mainly include ink printing, biopsy, scanner, microscopy, and chemical methods based on color reaction of substances secreted from the finger. Wherein the ink stamping method comprises directly dipping ink with fingers, further pressing to the substrate surface, so as to obtain the finger fingerprint structure, Li et al accurately measure the position relation of the local sweat pores of the ink-printed fingerprint sample of 10 persons by using computer software, the data results are analyzed and the stability of the characteristic of the fingerprint sweat pore extracted by the ink method is discussed (the research on the stability of the characteristic of the fingerprint sweat pore printed by the ink method [ J ]. criminal technology, 2014, (02):37-38 ]), although the ink printing method can objectively reflect the sweat pore characteristics of fingerprints, the method has the main disadvantages that the three-level characteristics of fingerprints are not ideal in reflection, the sweat pore, the streak line morphological characteristics and the fine dot line characteristics are poor in stability under different pressures, the larger the pressure of the stamping is, the larger the deformation of the three-level characteristic is, and even the complete deformation becomes another characteristic; the in vivo acquirer method, the scanner method and the microscope method respectively directly acquire an electronic image of a fingerprint by rolling a finger on three sides of the in vivo acquirer, placing the finger on the scanner and placing the finger under the microscope for observation, and the patent with the publication number of CN209879525U discloses a fingerprint acquirer with a shielding mechanism, wherein although the fingerprint scanning equipment can acquire a finer fingerprint structure, the fingerprint scanning equipment has higher requirements on the instrument, so that the fingerprint scanning equipment is not easy to popularize in daily life; the Kim and others design a hydrogen color-changing sensor, namely, a hydrogen chromium polymer is used for drawing sweat pore information (J.Lee, M.Pyo, S.h.Lee, J.Kim, M.Ra, W.Y.Kim, B.J.park, C.W.Lee, J.M.Kim, Hydrochromic connected polymers for human breast pore mapping, Nature Commimunications, 2014,5) of the fingerprint, however, the method has the problems of complex processing process, complicated operation, high requirement on a fingerprint inspection instrument and the like. Therefore, at present, there is no simple and efficient method for acquiring the whole structure of the fingerprint.
Disclosure of Invention
The invention aims to provide a preparation method of water-soluble nano paper and application thereof in fingerprint structure acquisition, so as to solve the defects of difficult acquisition of a fingerprint tertiary structure, complex preparation route, poor universality and the like in the prior art; the method has the characteristics of obtaining all the structures of the fingerprints, simplicity, feasibility and strong universality.
The specific implementation process of the invention is as follows:
a preparation method of water-soluble nano paper comprises the following steps:
(1) dissolving a water-soluble polymer in water to prepare an aqueous solution of the water-soluble polymer;
(2) and depositing the water solution of the water-soluble polymer on a roller covered with an aluminum foil by using an electrostatic spinning method to obtain the water-soluble nano paper.
Further, in the step (1), the concentration of the aqueous solution of the water-soluble polymer is 0.05 to 0.25 g/mL.
Further, the water-soluble polymer is selected from any one or a combination of several of polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, polyacrylic acid, polyacrylamide, gelatin and agar.
Further, the specific process of the step (2) is that the water solution of the water-soluble polymer obtained in the step (1) is transferred into an injector for standby, the injector is fixed on an injection pump, and the needle head of the injector is connected with the anode of a high-voltage power supply; and (3) taking the roller covered with the aluminum foil as a receiver, connecting the roller with the negative electrode of a high-voltage power supply, turning on the power supply, and performing an electrostatic spinning process to obtain the water-soluble nano paper.
Further, in the electrostatic spinning process in the step (2), the flow rate of the water solution of the water-soluble polymer in the injector is 0.4-0.8 mL/h, the voltage of a high-voltage power supply is 7.00-17.00 kV, the collection distance is 10-20 cm, the collection distance is the distance between the needle head of the injector and the roller, and the collection time is 30-75 min.
The water-soluble nano paper prepared by the preparation method.
The water-soluble nano paper obtained by the method is applied to fingerprint structure acquisition.
The application process is to lightly press the surface of the water-soluble nano paper by using a finger to obtain the water-soluble nano paper with the fingerprint structure.
In the water-soluble polymer according to the method of the present invention, gelatin and agar are dissolved in hot water, and therefore, when preparing an aqueous solution containing gelatin and/or agar, they can be dissolved by stirring or other means in a water bath at 60 ℃ or higher, as required. In addition, in the electrostatic spinning process, the injector containing the aqueous solution of the gelatin and/or the agar can be fixed in a heating sleeve with the constant temperature of 70 ℃, and then the injector is fixed on an injection pump, and the needle head of the injector is connected with the positive pole of a high-voltage power supply; and (3) taking the roller covered with the aluminum foil as a receiver, connecting the roller with the negative electrode of a high-voltage power supply, turning on the power supply, and performing the electrostatic spinning process.
The electrostatic spinning process in the method is completed in a laboratory stage, so that the used equipment is small, the diameter of a roller is 8.5cm, the width of the cut aluminum foil is 8-10 cm, and the rotating speed of the roller is 200-1000 rpm. If the experiment is expanded to produce, parameters can be slightly adjusted, and the design idea is within the protection scope of the method and the application of the invention.
The reaction mechanism of the method of the invention is as follows: firstly, preparing a polymer aqueous solution, and depositing the polymer aqueous solution on an aluminum foil by utilizing an electrostatic spinning technology to obtain a high-flexibility nano paper material; meanwhile, as the sweat pores on the fingers are connected with the sweat glands, the positions and the sizes of the water drops on the fingers can be observed through observation, so that the principles of the positions and the sizes of the sweat pores on the fingers can be judged. Through directly pressing the finger to nanometer paper surface, when the sweat that sweat gland excretes on the finger contacts the hydrophilic water-soluble nanometer paper surface that possess big specific surface area, because capillary action, nanometer paper is by selective dissolution to obtain the position in finger sweat hole, protruding line on the finger is by the complete rubbing to nanometer paper, the complete structure of the fine collection fingerprint of hydrophilic nanometer paper finally. The method has the characteristics of simple and convenient preparation process, capability of obtaining a complete fingerprint structure, strong universality and the like.
The invention has the beneficial effects that:
(1) based on the advantages of the electrostatic spinning fibers, the nano paper capable of collecting fingerprints is obtained in one step, and the preparation condition is mild, the operation is simple, the repeatability is good, and the universality is strong.
(2) The structure of the fingerprint can be completely and really collected by directly pressing the nanometer paper with a finger.
Drawings
FIG. 1 is a schematic diagram of a method for preparing water-soluble nanopaper and a fingerprint collecting structure according to the present invention;
FIG. 2 is a scanning electron microscope photograph of the surface topography of the water-soluble nanopaper prepared in accordance with the present invention;
FIG. 3 is a microphotograph of a cross-section of water-soluble nanopaper prepared according to the present invention;
FIG. 4 is a digital photograph of the water-soluble nanopaper having a fingerprint structure according to the present invention;
FIG. 5 is a microscope photograph of a primary structure of a fingerprint captured according to the present invention;
FIG. 6 is a microscope photograph of the secondary structure of the fingerprint collected by the present invention;
FIG. 7 is a microscope photograph of the three-level structure of the fingerprint of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
In order to solve the problems that a fine fingerprint structure is difficult to obtain in the prior art, the preparation process is complex, the dependence on instruments is strong, the universality is poor and the like, the invention provides the preparation method of the water-soluble nano paper and the application of the water-soluble nano paper in fingerprint structure acquisition.
The design idea of the invention is as follows: as is well known, sweat pores in fingers are connected with sweat glands, sweat is secreted, and the main component of sweat is water, so that the positions and the sizes of the sweat pores in the fingers can be judged by observing the positions and the sizes of water drops on the fingers. Inspired by the above, the inventor prepares the water-soluble nano paper with high flexibility and super-hydrophilicity by an electrostatic spinning technology; further directly press nanometer paper through the finger, protruding line is by complete rubbing to nanometer paper surface on the finger, and the selective part of sweat hole secretion dissolves nanometer paper for the fine complete construction of gathering the fingerprint of nanometer paper. The method has the characteristics of simple and convenient acquisition of a complete fingerprint structure, strong universality and the like.
Example 1
Preparation process of water soluble nano paper
The preparation method of the water-soluble nano paper comprises the following steps:
(1) weighing 0.6800g of polyvinyl alcohol, dissolving in 4mL of distilled water, and magnetically stirring for 4h at the temperature of 60 ℃ in a water bath kettle to obtain a polyvinyl alcohol solution with the concentration of 0.17 g/mL;
(2) transferring the polyvinyl alcohol solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.5mL/h, the voltage of a high-voltage power supply is 14.53kV, the collection distance is 15cm, the rotating speed of a roller is 200rpm, and the collection time is 60min (figure 1), so that the water-soluble nano paper of the target product is obtained. Scanning electron microscope results show that the prepared fibers are uniform in morphology (fig. 2), and the thickness of the nano-paper is 14 microns through microscope observation (fig. 3).
Application of (II) water-soluble nano paper in fingerprint structure acquisition and performance test
The surface of the water-soluble nanopaper prepared in example 1 was lightly pressed with a finger to obtain a water-soluble nanopaper having a fingerprint structure collected thereon (fig. 4). The surface morphology of the water-soluble nano paper is observed by using a scanning electron microscope (Hitachi, S4800), and the result shows that the obtained water-soluble nano paper has a uniform structure; further, the inventors observed the thickness of the nanopaper using a microscope (UY 203i, opu, chongqing) and observed the nanopaper with the fingerprint structure collected under different magnifications, and clearly observed the entire structure (primary, secondary, and tertiary structures) of the fingerprint (fig. 5-7).
Example 2
The preparation method of the water-soluble nano paper comprises the following steps:
(1) weighing 0.6000g of polyvinyl alcohol, dissolving in 4mL of distilled water, and magnetically stirring for 4h at the temperature of 60 ℃ in a water bath to obtain a polyvinyl alcohol solution with the concentration of 0.15 g/mL;
(2) transferring the polyvinyl alcohol solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 8cm and the diameter of 8.5cm as a receiver, connecting the roller with the negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.4mL/h, the voltage of a high-voltage power supply is 16.70kV, the collecting distance is 12cm, the rotating speed of a roller is 800rpm, and the collecting time is 75min, so that the target product, namely the water-soluble nano paper is obtained.
Example 3
The preparation method of the water-soluble nano paper comprises the following steps:
(1) weighing 0.8800g of polyvinylpyrrolidone, dissolving in 4mL of distilled water, and magnetically stirring for 3h at room temperature to obtain 0.22g/mL of polyvinylpyrrolidone;
(2) transferring the polyvinylpyrrolidone solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.6mL/h, the voltage of a high-voltage power supply is 8.97kV, the collecting distance is 14cm, the rotating speed of a roller is 500rpm, and the collecting time is 50min, so that the target product, namely the water-soluble nano paper is obtained.
Example 4
The preparation method of the water-soluble nano paper comprises the following steps:
(1) weighing 1.0000g of polyvinylpyrrolidone, dissolving the polyvinylpyrrolidone in 4mL of distilled water, and magnetically stirring the mixture for 5 hours at room temperature to obtain 0.25g/mL of polyvinylpyrrolidone;
(2) transferring the polyvinylpyrrolidone solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 9cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.8mL/h, the voltage of a high-voltage power supply is 7.54kV, the collecting distance is 16cm, the rotating speed of a roller is 600rpm, and the collecting time is 30min, so that the target product, namely the water-soluble nano paper is obtained.
Example 5
The preparation method of the water-soluble nano paper comprises the following steps:
(1) 0.3200g of polyoxyethylene is weighed and dissolved in 4mL of distilled water, and the mixture is magnetically stirred for 3 hours at room temperature to obtain 0.08g/mL of polyoxyethylene aqueous solution;
(2) transferring the polyoxyethylene aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on a syringe pump, and connecting a needle head of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.7mL/h, the voltage of a high-voltage power supply is 16.80kV, the collecting distance is 16cm, the rotating speed of a roller is 200rpm, and the collecting time is 40min, so that the target product, namely the water-soluble nano paper is obtained.
Example 6
The preparation method of the water-soluble nano paper comprises the following steps:
(1) weighing 0.8400g of polyacrylic acid, dissolving in 4mL of distilled water, and magnetically stirring for 3h at room temperature to obtain a polyacrylic acid aqueous solution with the concentration of 0.21 g/mL;
(2) transferring the polyacrylic acid aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.5mL/h, the voltage of a high-voltage power supply is 14.80kV, the collecting distance is 16cm, the rotating speed of a roller is 400rpm, and the collecting time is 60min, so that the target product, namely the water-soluble nano paper is obtained.
Example 7
The preparation method of the water-soluble nano paper comprises the following steps:
(1) weighing 0.9600g of polyacrylamide, dissolving in 4mL of distilled water, and magnetically stirring for 3h at room temperature to obtain a polyacrylamide aqueous solution with the concentration of 0.24 g/mL;
(2) transferring the polyacrylamide aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.7mL/h, the voltage of a high-voltage power supply is 12.50kV, the collecting distance is 13cm, the rotating speed of a roller is 200rpm, and the collecting time is 40min, so that the target product, namely the water-soluble nano paper is obtained.
Example 8
The preparation method of the water-soluble nano paper comprises the following steps:
(1) weighing 0.4400g of gelatin, dissolving in 4mL of distilled water, and stirring for 5h at 60 ℃ in a water bath to obtain a gelatin water solution with the concentration of 0.11 g/mL;
(2) transferring the gelatin aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 9cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.8mL/h, the voltage of a high-voltage power supply is 7.00kV, the collecting distance is 12cm, the rotating speed of a roller is 1000rpm, and the collecting time is 30min, so that the water-soluble nano paper of the target product is obtained.
Example 9
The preparation method of the water-soluble nano paper comprises the following steps:
(1) weighing 0.68g of agar, dissolving in 4mL of distilled water, and stirring for 5h at 60 ℃ in a water bath to obtain an agar aqueous solution with the concentration of 0.17 g/mL;
(2) transferring the agar aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on a heating sleeve with the constant temperature of 70 ℃, further fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with the positive pole of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.6mL/h, the voltage of a high-voltage power supply is 9.31kV, the collecting distance is 15cm, the rotating speed of a roller is 500rpm, and the collecting time is 50min, so that the target product, namely the water-soluble nano paper is obtained.
Example 10
The preparation method of the water-soluble nano paper comprises the following steps:
(1) respectively weighing 0.6800g of polyvinyl alcohol and 0.0680g of gelatin, dissolving in 4mL of distilled water, and stirring for 5 hours at 60 ℃ in a water bath to obtain a polyvinyl alcohol/gelatin aqueous solution with the compounding amount of 10% (mass ratio of gelatin to polyvinyl alcohol);
(2) transferring the polyvinyl alcohol/gelatin aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 8cm and the diameter of 8.5cm as a receiver, connecting the roller with the negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.5mL/h, the voltage of a high-voltage power supply is 14.37kV, the collection distance is 12cm, the rotating speed of a roller is 200rpm, and the collection time is 60min, so that the target product, namely the water-soluble nano paper is obtained.
Example 11
The preparation method of the water-soluble nano paper comprises the following steps:
(1) respectively weighing 0.6800g of polyvinyl alcohol and 0.1360g of gelatin, dissolving in 4mL of distilled water, and stirring for 5 hours at the temperature of 60 ℃ in a water bath to obtain a polyvinyl alcohol/gelatin aqueous solution with the compounding amount of 20% (mass ratio of gelatin to polyvinyl alcohol);
(2) transferring the polyvinyl alcohol/gelatin aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.7mL/h, the voltage of a high-voltage power supply is 12.58kV, the collecting distance is 10cm, the rotating speed of a roller is 600rpm, and the collecting time is 40min, so that the target product, namely the water-soluble nano paper is obtained.
Example 12
The preparation method of the water-soluble nano paper comprises the following steps:
(1) respectively weighing 0.6800g of polyvinyl alcohol and 0.0340g of agar, dissolving in 4mL of distilled water, and stirring for 5h at 60 ℃ in a water bath to obtain a polyvinyl alcohol/agar aqueous solution with the compounding amount of 5% (mass ratio of agar to polyvinyl alcohol);
(2) transferring the polyvinyl alcohol/agar aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on a heating sleeve with the constant temperature of 70 ℃, further fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with the positive pole of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.5mL/h, the voltage of a high-voltage power supply is 15.31kV, the collection distance is 10cm, the rotating speed of a roller is 200rpm, and the collection time is 60min, so that the target product, namely the water-soluble nano paper is obtained.
Example 13
The preparation method of the water-soluble nano paper comprises the following steps:
(1) respectively weighing 0.6800g of polyacrylic acid and 0.1360g of polyoxyethylene, dissolving in 4mL of distilled water, and stirring for 5h at the temperature of 60 ℃ in a water bath to obtain a polyacrylic acid/polyoxyethylene aqueous solution with the compounding amount of 20% (mass ratio of polyoxyethylene to polyacrylic acid);
(2) transferring the polyacrylic acid/polyethylene oxide aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on an injection pump, and connecting a needle head of the syringe with a positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.5mL/h, the voltage of a high-voltage power supply is 13.31kV, the collecting distance is 10cm, the rotating speed of a roller is 500rpm, and the collecting time is 60min, so that the target product, namely the water-soluble nano paper is obtained.
Example 14
The preparation method of the water-soluble nano paper comprises the following steps:
(1) weighing 0.2000g of polyoxyethylene, dissolving the polyoxyethylene in 4mL of distilled water, and magnetically stirring the solution for 3 hours at room temperature to obtain a polyoxyethylene aqueous solution with the concentration of 0.05 g/mL;
(2) transferring the polyoxyethylene aqueous solution obtained in the step (1) into a 5mL glass syringe, fixing the glass syringe on a syringe pump, and connecting a needle head of the syringe with the positive electrode of a high-voltage power supply; taking a roller covered with an aluminum foil with the width of 10cm and the diameter of 8.5cm as a receiver, connecting a negative electrode of a high-voltage power supply, turning on the power supply, and carrying out electrostatic spinning, wherein the parameters of the electrostatic spinning process are as follows: the flow rate is 0.7mL/h, the voltage of a high-voltage power supply is 17.00kV, the collection distance is 20cm, the rotating speed of a roller is 200rpm, and the collection time is 40min, so that the target product, namely the water-soluble nano paper is obtained.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and is not intended to limit the invention to the particular forms disclosed. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A preparation method of water-soluble nano paper is characterized by comprising the following steps:
(1) dissolving a water-soluble polymer in water to prepare an aqueous solution of the water-soluble polymer;
(2) and depositing the water solution of the water-soluble polymer on a roller covered with an aluminum foil by using an electrostatic spinning method to obtain the water-soluble nano paper.
2. The method for preparing water-soluble nanopaper according to claim 1, wherein: in the step (1), the concentration of the water solution of the water-soluble polymer is 0.05-0.25 g/mL.
3. The method for preparing water-soluble nanopaper according to claim 1, wherein: the water-soluble polymer is selected from one or more of polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide, polyacrylic acid, polyacrylamide, gelatin and agar.
4. The method for preparing water-soluble nanopaper according to claim 1, wherein: transferring the water solution of the water-soluble polymer obtained in the step (1) into an injector for standby, fixing the injector on an injection pump, and connecting a needle head of the injector with a positive electrode of a high-voltage power supply; and (3) taking the roller covered with the aluminum foil as a receiver, connecting the roller with the negative electrode of a high-voltage power supply, turning on the power supply, and performing an electrostatic spinning process to obtain the water-soluble nano paper.
5. The method for preparing water-soluble nanopaper according to claim 4, wherein: in the electrostatic spinning process in the step (2), the flow rate of the water solution of the water-soluble polymer in the injector is 0.4-0.8 mL/h, the voltage of a high-voltage power supply is 7.00-17.00 kV, the collecting distance is 10-20 cm, the collecting distance is the distance between the needle head of the injector and the roller, and the collecting time is 30-75 min.
6. The water-soluble nanopaper prepared by the method of any one of claims 1 to 5.
7. Use of the water-soluble nanopaper obtained in claim 6 in fingerprint structure acquisition.
8. Use according to claim 7, characterized in that: and lightly pressing the surface of the water-soluble nano paper by using a finger to obtain the water-soluble nano paper with the fingerprint structure.
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Application publication date: 20200925 |