CN113459692A - Preparation method of fluorescent anti-counterfeiting coating based on leather waste - Google Patents
Preparation method of fluorescent anti-counterfeiting coating based on leather waste Download PDFInfo
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- CN113459692A CN113459692A CN202110744386.7A CN202110744386A CN113459692A CN 113459692 A CN113459692 A CN 113459692A CN 202110744386 A CN202110744386 A CN 202110744386A CN 113459692 A CN113459692 A CN 113459692A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/12—Stencil printing; Silk-screen printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/26—Printing on other surfaces than ordinary paper
- B41M1/38—Printing on other surfaces than ordinary paper on wooden surfaces, leather, or linoleum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
- B41M3/142—Security printing using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/184—Preparation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/22—Luminous paints
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
- D06P1/5207—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- D06P1/525—Polymers of unsaturated carboxylic acids or functional derivatives thereof
- D06P1/5257—(Meth)acrylic acid
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/673—Inorganic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
- B41M2205/40—Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Textile Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
The invention discloses a preparation method of a fluorescent anti-counterfeiting coating based on leather waste, and belongs to the technical field of graphene quantum dots. The leather waste is dried and then crushed to obtain crushed leather scraps, and the crushed leather scraps are uniformly dispersed in ultrapure water to obtain a dispersion liquid; carrying out hydrothermal reaction on the obtained dispersion liquid, and carrying out suction filtration after the hydrothermal reaction is finished to obtain graphene quantum dot water dispersion liquid; and compounding the obtained graphene quantum dot water dispersion liquid with a thickening agent to prepare a fluorescent anti-counterfeiting coating, and printing the anti-counterfeiting two-dimensional code on the substrate by adopting a printing mode to prepare the fluorescent anti-counterfeiting coating based on the leather waste. The preparation method has the advantages of simplicity, convenience, greenness and large-scale production, solves the problems of complex preparation process and purification of the graphene quantum dots, and can realize the preparation of the anti-counterfeiting coating at lower concentration.
Description
Technical Field
The invention belongs to the technical field of graphene quantum dots, and relates to a preparation method of a fluorescent anti-counterfeiting coating based on leather waste.
Background
In recent years, security labels based on luminescent nanoparticles have been applied to the field of security, and researchers have reported security inks prepared from various materials. The materials used in the luminescent anti-counterfeiting security ink comprise organic dyes, polymer nano materials, semiconductor nano materials, rare earth doped luminescent nano materials, carbon-based quantum dots and the like. Organic dyes are widely used as fluorescent inks, but they are limited by poor photostability and small stokes shift. Conjugated polymer dots and inorganic semiconductor quantum dots have been used as substitutes for organic fluorescent dyes due to their adjustable fluorescent properties, narrow emission band gap and excellent photostability; however, polymer dots require complicated preparation processes and are expensive, and most inorganic semiconductor quantum dots contain toxic heavy metal elements, which cause potential environmental hazards and generate toxicity in long-term use. The rare earth doped luminescent nano material has excellent fluorescence property and is used for manufacturing high-safety anti-counterfeiting patterns under near-infrared excitation, but a large amount of heavy metal ions in the material not only pollute the environment, but also cause harm to human health, and the rare earth metal is expensive, so that the preparation cost of the fluorescent ink is overhigh. The carbon-based quantum dots containing the graphene quantum dots have the advantages of low cost, easiness in preparation, high fluorescence stability, low toxicity and the like, and become the most applicable luminescent nano material in the aspect of anti-counterfeiting.
The existing related technologies for directly using graphene quantum dots as anti-counterfeiting materials or proposing application potentials mainly include the following aspects: firstly, doping modification of graphene quantum dots is mainly aimed at improving the dispersibility of the graphene quantum dots in a composite system (CN201710736513.2, CN201810091600.1 and the like); secondly, the construction and formula design of the anti-counterfeiting material comprise the composition of the anti-counterfeiting material with materials such as graphene and polyvinyl alcohol (CN201710705134.7, CN201611177051.7, CN202011430716.7 and the like); thirdly, graphene quantum dots with fluorescent effect are prepared based on different raw materials, most of the raw materials are small molecular substances such as 1,3, 6-trinitropyrene, citrate and the like (CN201910833860.6 and the like), and natural carbon-containing substances such as coal, lignin and the like (CN201610427254.0, CN201910548937.5, CN201910833865.9 and the like) are also used as carbon sources.
The leather waste can also be used as a carbon source for preparing the graphene quantum dots, the leather waste comprises pickled leather, ash-soaked leather, wet blue leather, dyed leather and the like according to different sources, the leather waste is not easy to degrade, and the leather waste and common garbage are jointly placed in the environment, so that the environment is polluted, the ecological cycle is seriously unbalanced, and the waste of leather resources is also caused. How to reduce the environmental pollution to the maximum extent and make full use of the leather waste becomes one of the key technologies in the research of the leather industry. However, the currently disclosed graphene quantum dot preparation process conditions often have the problems of complicated procedures and complicated product purification.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a preparation method of a fluorescent anti-counterfeiting coating based on leather waste, which solves the problems of complex preparation process conditions and complex separation and purification of graphene quantum dots, and provides a method for obtaining the anti-counterfeiting coating at a lower concentration.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a preparation method of a fluorescent anti-counterfeiting coating based on leather waste, which comprises the following steps: drying and crushing leather waste to obtain crushed leather scraps, and uniformly dispersing the crushed leather scraps in ultrapure water to obtain a dispersion liquid; carrying out hydrothermal reaction on the obtained dispersion liquid, and carrying out suction filtration after the hydrothermal reaction is finished to obtain graphene quantum dot water dispersion liquid; and compounding the obtained graphene quantum dot water dispersion liquid with a thickening agent to prepare a fluorescent anti-counterfeiting coating, and printing the anti-counterfeiting two-dimensional code on the substrate by adopting a printing mode to prepare the fluorescent anti-counterfeiting coating based on the leather waste.
Preferably, the leather waste comprises waste of pickled leather, lime leather, wet blue leather, dyed leather.
Preferably, the pulverization is carried out using a ball mill.
Preferably, the feeding ratio of the crushed leather scraps to the ultrapure water is 0.5-0.8 g: 30-60 mL.
Preferably, the temperature of the hydrothermal reaction is 180-220 ℃, and the hydrothermal time is 8-12 h.
Preferably, the filter used for suction filtration is a 0.1 μm aqueous filter.
Preferably, the thickener is a polyacrylic acid thickener.
Preferably, the substrate comprises paper, fabric or leather.
Preferably, the printing is screen printing.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a preparation method of a fluorescent anti-counterfeiting coating based on leather waste, which takes the leather waste as a raw material and realizes simple and convenient preparation of graphene quantum dots; the method is mainly characterized in that the graphene quantum dots are prepared by using biomass leather waste through a one-step hydrothermal method, and can be simply, conveniently and green and produced in a large scale only by controlling the size of the crushed leather scraps of the raw materials, and mainly because natural carbon-containing substances are used as carbon sources, the carbon substances are effectively used for carbon skeletons of the graphene quantum dots, the purpose cannot be efficiently realized by excessively controlling the pH, the oxidation conditions and the like, and the purposes of increasing the contact area of reactants and increasing the carbon conversion efficiency can be achieved by controlling the size of the raw materials; the product can be obtained only by simple suction filtration without complex post-treatment. The fluorescent property of the graphene quantum dots is combined with the specific anti-counterfeiting two-dimensional code, the leather waste-based fluorescent anti-counterfeiting coating is obtained under the action of the thickening agent, the anti-counterfeiting coating can be widely applied to anti-counterfeiting of different substrates, has a good application prospect, and effectively solves the problems of preparation, purification and application of the graphene quantum dots.
Furthermore, the size of the raw materials can be optimized and controlled by controlling the size of the leather waste after being crushed; thereby achieving the effects of increasing the contact area of the reactants and the efficiency of carbon conversion.
Drawings
FIG. 1 is a schematic view of a fluorescent anti-counterfeit coating based on leather waste according to example 1 of the present invention; wherein (a) is under sunlight, and (b) is under 365nm UV;
FIG. 2 is a schematic view of a fluorescent anti-counterfeit coating based on leather waste according to example 2 of the present invention; wherein (a) is under sunlight, and (b) is under 365nm UV;
FIG. 3 is a schematic view of a fluorescent anti-counterfeit coating based on leather waste according to example 3 of the present invention; wherein (a) is under sunlight and (b) is under 365nm UV.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention discloses a preparation method of a fluorescent anti-counterfeiting coating based on leather waste, which comprises the following steps:
(1) drying and crushing the leather waste;
(2) weighing the crushed leather scraps, adding the crushed leather scraps into ultrapure water, and fully stirring until the crushed leather scraps are uniformly dispersed to obtain a dispersion liquid;
(3) adding the dispersion liquid into a stainless steel reaction kettle with a polytetrafluoroethylene inner container, carrying out hydrothermal reaction at a certain temperature for a certain time, and carrying out suction filtration after the hydrothermal reaction is finished to obtain graphene quantum dot water dispersion liquid;
(4) compounding the graphene quantum dots and the thickening agent to prepare the fluorescent anti-counterfeiting coating, and applying the anti-counterfeiting two-dimensional codes to different substrates by adopting the printing mode to prepare the fluorescent anti-counterfeiting coating based on the leather waste.
In the step (1), the leather waste comprises pickled leather, ash-soaked leather, wet blue leather, and waste or leather scraps of dyed leather, which shows that the preparation method is applicable to all leather waste; the grinding is carried out by adopting a ball mill until the leather waste can penetrate through a 200-mesh screen, and the size of the raw materials can be optimally controlled by controlling the size of the ground leather waste.
In the step (2), the using amount of the ground leather scraps is weighed to be 0.5-0.8 g, and the using amount of ultrapure water is 30-60 mL. The basic technical parameters for realizing the preparation of the graphene quantum dots are provided on the basis of controlling the size of the raw materials.
In the step (3), the reaction temperature is 180-220 ℃, and the reaction time is 8-12 h; the filter used for the suction filtration was a 0.1 μm aqueous filter. The purification treatment mode of the graphene quantum dots is indicated, so that the use of a complex process is avoided;
in the step (4), the thickener is polyacrylic acid thickener PTF. The basis for realizing the preparation of the anti-counterfeiting coating under low concentration is indicated, namely the thickening effect of the thickening agent is utilized;
in the step (4), different matrixes comprise filter paper, terylene and undyed crust leather which is fatted by the retanning agent, and the range of the application base material is indicated; the printing method adopted is screen printing.
The invention is described in further detail below with reference to the following figures and specific examples:
example 1:
(1) drying the goat ash dipping skin waste, and crushing the goat ash dipping skin waste by using a ball mill until the goat ash dipping skin waste can penetrate through a 200-mesh screen;
(2) weighing 0.6g of the ash bark powder crushed in the step (1), adding 30mL of ultrapure water, and fully stirring until the ash bark powder is uniformly dispersed;
(3) adding the dispersion liquid obtained in the step (2) into a stainless steel reaction kettle with a 100mL polytetrafluoroethylene inner container, carrying out hydrothermal reaction for 12h at 200 ℃, and carrying out suction filtration by using a 0.1-micrometer microporous filter membrane after the reaction is finished to obtain graphene quantum dot water dispersion liquid;
(4) and compounding the graphene quantum dots and a polyacrylic acid thickening agent PTF, and obtaining the fluorescent anti-counterfeiting coating of the two-dimensional code on the filter paper in a screen printing mode.
Figure 1 shows an effect diagram of a graphene quantum dot fluorescent anti-counterfeiting coating obtained on filter paper under the irradiation of sunlight and 365nm ultraviolet light. As can be seen from the figure, under the sunlight, the two-dimensional code pattern on the filter paper cannot be identified, and only has an invisible faint yellow trace, because the prepared graphene quantum dot is brownish yellow; under 365nm ultraviolet light, the two-dimensional code pattern on the filter paper emits strong blue fluorescence, and is very easy to identify.
Example 2:
(1) drying goat dyed crust leather waste, and then crushing the goat dyed crust leather waste by using a ball mill until the goat dyed crust leather waste can penetrate through a 200-mesh screen;
(2) weighing 0.5g of dyed crust leather powder crushed in the step (1), adding 50mL of ultrapure water, and fully stirring until the dyed crust leather powder is uniformly dispersed;
(3) adding the dispersion liquid obtained in the step (2) into a stainless steel reaction kettle with a 100mL polytetrafluoroethylene inner container, carrying out hydrothermal reaction for 10h at 200 ℃, and carrying out suction filtration by using a 0.1-micrometer microporous filter membrane after the reaction is finished to obtain graphene quantum dot water dispersion liquid;
(4) and compounding the graphene quantum dots and a polyacrylic acid thickening agent PTF, and obtaining the fluorescent anti-counterfeiting coating of the two-dimensional code on the terylene by adopting a screen printing mode.
Figure 2 shows an effect diagram of the graphene quantum dot fluorescent anti-counterfeiting coating obtained on the terylene under the irradiation of sunlight and 365nm ultraviolet light. As can be seen from the figure, under the sunlight, the two-dimensional code pattern on the terylene is invisible and can not identify and scan any information; under 365nm ultraviolet light, the two-dimensional code pattern on the terylene is clear, emits blue fluorescence and is easy to identify.
Example 3:
(1) drying goat blue wet leather waste, and then crushing the goat blue wet leather waste by using a ball mill until the goat blue wet leather waste can penetrate through a 200-mesh screen;
(2) weighing 0.8g of the blue wet leather crushed in the step (1), adding 40mL of ultrapure water, and fully stirring until the blue wet leather is uniformly dispersed;
(3) adding the dispersion liquid obtained in the step (2) into a stainless steel reaction kettle with a 100mL polytetrafluoroethylene inner container, carrying out hydrothermal reaction for 8h at 220 ℃, and carrying out suction filtration by using a 0.1-micrometer microporous filter membrane after the reaction is finished to obtain graphene quantum dot water dispersion liquid;
(4) compounding the graphene quantum dots and a polyacrylic acid thickening agent PTF, and obtaining the fluorescent anti-counterfeiting coating of the two-dimensional code on undyed and unpainted crust leather after retanning and fatliquoring in a screen printing mode.
FIG. 3 shows an effect diagram of a graphene quantum dot fluorescent anti-counterfeiting coating obtained on undyed crust leather under the irradiation of sunlight and 365nm ultraviolet light. As can be seen from the figure, under the sunlight, the two-dimensional code pattern on the undyed crust leather is difficult to be visually identified, and no information can be identified through scanning; and under 365nm ultraviolet light, the two-dimensional code pattern on the undyed crust leather is clear, and bright blue fluorescence is emitted.
Example 4:
(1) drying goat pickled skin waste, and crushing the goat pickled skin waste by using a ball mill until the goat pickled skin waste can penetrate through a 200-mesh screen;
(2) weighing 0.7g of pickled skin crushed in the step (1), adding 60mL of ultrapure water, and fully stirring until the pickled skin is uniformly dispersed;
(3) adding the dispersion liquid obtained in the step (2) into a stainless steel reaction kettle with a 100mL polytetrafluoroethylene inner container, carrying out hydrothermal reaction for 11h at 180 ℃, and carrying out suction filtration by using a 0.1-micrometer microporous filter membrane after the reaction is finished to obtain graphene quantum dot water dispersion liquid;
(4) and compounding the graphene quantum dots and a polyacrylic acid thickening agent PTF, and obtaining the fluorescent anti-counterfeiting coating of the two-dimensional code on the filter paper in a screen printing mode.
In conclusion, the preparation method of the fluorescent anti-counterfeiting coating based on the leather waste provides a targeted innovative scheme aiming at the leather waste preprocessing, the graphene quantum dot post-treatment and the anti-counterfeiting coating preparation process. Compared with the prior art that natural carbon-containing substances are used as carbon sources, the method focuses on the treatment of leather waste and the preparation of subsequent anti-counterfeiting coatings. The existing preparation technology aiming at lignin, coal and the like requires strict control of oxidation conditions, alkaline conditions, vacuum degree and the like of reaction, which is not beneficial to efficient conversion of graphene quantum dots and brings negative effects on aspects of product separation and purification and the like. According to the preparation method, the graphene quantum dots can be obtained only by controlling the original size of the waste and simple temperature, time and filtering process. In the aspect of obtaining the anti-counterfeiting coating, the graphene quantum dot water dispersion liquid with lower concentration can be treated by the anti-counterfeiting coating without different base materials through the action of a thickening agent and the like.
Based on the above, the invention provides a preparation method of a fluorescent anti-counterfeiting coating based on leather wastes, which comprises the steps of preparing the leather wastes into graphene quantum dots by a one-step hydrothermal method, compounding the graphene quantum dots with a thickening agent, and obtaining the fluorescent anti-counterfeiting coating on different substrates such as paper, fabrics and leather by combining a silk-screen printing technology. Therefore, the preparation method disclosed by the invention is simple and convenient in process, easy to obtain, green and environment-friendly, and low in cost. The method not only makes full use of the protein in the leather waste and reduces the pollution to the environment, but also makes use of the fluorescence characteristic of the prepared graphene quantum dots to prepare the fluorescent anti-counterfeiting coating and increases the added value of the product.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. A preparation method of a fluorescent anti-counterfeiting coating based on leather waste is characterized by comprising the following steps: drying and crushing leather waste to obtain crushed leather scraps, and uniformly dispersing the crushed leather scraps in ultrapure water to obtain a dispersion liquid; carrying out hydrothermal reaction on the obtained dispersion liquid, and carrying out suction filtration after the hydrothermal reaction is finished to obtain graphene quantum dot water dispersion liquid; and compounding the obtained graphene quantum dot water dispersion liquid with a thickening agent to prepare a fluorescent anti-counterfeiting coating, and printing the anti-counterfeiting two-dimensional code on the substrate by adopting a printing mode to prepare the fluorescent anti-counterfeiting coating based on the leather waste.
2. The method for preparing a fluorescent anti-counterfeiting coating based on leather waste as claimed in claim 1, wherein the leather waste comprises waste of pickled leather, ashed leather, wet blue leather and dyed leather.
3. The preparation method of the fluorescent anti-counterfeiting coating based on the leather waste as claimed in claim 1, wherein the grinding is carried out by a ball mill.
4. The method for preparing the fluorescent anti-counterfeiting coating based on the leather waste as claimed in claim 1, wherein the feeding ratio of the smashed leather scraps to the ultrapure water is 0.5-0.8 g: 30-60 mL.
5. The preparation method of the fluorescent anti-counterfeiting coating based on the leather waste as claimed in claim 1, wherein the temperature of the hydrothermal reaction is 180-220 ℃ and the hydrothermal time is 8-12 h.
6. The method for preparing a fluorescent anti-counterfeiting coating based on leather waste as claimed in claim 1, wherein the filter membrane used for suction filtration is a 0.1 μm water-based filter membrane.
7. The method for preparing a fluorescent anti-counterfeiting coating based on leather waste according to claim 1, wherein the thickening agent is polyacrylic acid thickening agent.
8. The method for preparing a fluorescent anti-counterfeiting coating based on leather waste as claimed in claim 1, wherein the substrate comprises paper, fabric or leather.
9. The preparation method of the fluorescent anti-counterfeiting coating based on the leather waste as claimed in claim 1, wherein the adopted printing mode is screen printing.
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