Uv-led light-cured fluorescent inkjet ink and a brush product formed thereof and a method of preparing the same

Abstract

The application relates to the field of anti-counterfeiting technology and discloses UV-LED light-cured fluorescent inkjet ink, a brush product formed by the inkjet ink and a preparation method of the brush product. The UV-LED light-cured fluorescent inkjet ink provided by the application contains 10-40 parts by weight of an acrylate prepolymer, 3-15 parts by weight of a photoinitiator, 20-80 parts by weight of an active diluent, 0.1-10 parts by weight of amino-acrylic acid modified organic fluorescent powder and 0.01-5 parts by weight of a leveling agent. The acrylate prepolymer is an amine modified acrylate prepolymer. The UV-LED light-cured fluorescent inkjet ink provided by the application does not contain a solvent, is suitable for high-precision industrial piezoelectric nozzle inkjet printing and has good printing fluency. The inkjet ink has fast curing speed, good adhesion, good stability, low price, high fluorescent intensity of the prepared printed product and long fluorescent life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of anti-counterfeiting technology, and particularly relates to a UV-LED light-cured fluorescent inkjet ink, a brush product formed by the ink and a preparation method of the brush product. BACKGROUND

[0002] The invisible anti-counterfeiting fluorescent ink is colorless and invisible under ordinary light after printing, and the printed anti-counterfeiting content is clearly visible only under a specific ultraviolet light environment. The invisible fluorescent ink is widely used in the anti-counterfeiting field of bills, securities, packaging and the like. The traditional invisible anti-counterfeiting ink is generally in a water-based or solvent system. The water-based system has slow drying, high energy consumption and low printing precision; the solvent system generally uses ketone or benzene solvents, which are highly toxic and harmful to health, and a large amount of organic solvents volatilize into the air during use, causing environmental pollution. The UV-cured ink has fast curing speed, no VOC emission and can realize high-speed printing. The inkjet printing can realize “one object one code” due to data variability, and can realize double anti-counterfeiting effect in combination with the invisible UV ink.

[0003] The traditional fluorescent anti-counterfeiting ink is divided into two types. One type is that organic fluorescent powder is dissolved in a solvent system. The solvent in this system is volatile, and the fluorescent lifetime is short.

[0004] CN110218484A discloses a transparent fluorescent inkjet ink, which selects organic ketone and organic ester as solvents, and rare earth terbium salt as a fluorescent agent. The ink shows green fluorescence and has strong light resistance. However, during the printing process, 60-80% of the solvent is volatilized into the air, causing serious environmental pollution.

[0005] CN1106434C discloses an inkjet printing ink composition, which selects acetone, methyl ethyl ketone, methanol or ethanol as solvents, and 2,2-(2,5-thiophenediyl)-bis(5-tert-butylbenzoxazole) as a fluorescent agent. In addition to the solvent volatilization pollution, the organic fluorescent powder has a short service life and limited application.

[0006] The other type of fluorescent ink is to disperse inorganic fluorescent powder into the ink. The particle size of the fluorescent powder is generally micron grade, and the particle size is too large to be used in inkjet printing.

[0007] CN107189551B discloses a UV-cured offset fluorescent anti-counterfeiting ink, which disperses fluorescent anti-counterfeiting pigments in the UV-cured ink. The ink has strong color change effect and good adhesion. However, the particle size of the fluorescent pigment is micron grade, which can block the nozzle during printing and cannot be used in inkjet ink.

[0008] CN102260438B discloses an LED fluorescent ink composition for inkjet printing. The ink uses a UV-curable and thermally curable resin system, to which water and solvent are added as humectants. The fluorescent substance is an organic or inorganic rare earth material with a particle size of less than 2 microns. The particle size of this ink is only suitable for special large-orifice nozzles. The nozzle diameter of industrial-grade high-precision nozzles is about 20 microns, and the ink particle size is required to be less than 1% of the nozzle diameter. Therefore, industrial-grade high-precision nozzles require the particle size of dispersed particles to be less than 200 nanometers. Obviously, the particle size in this patent is not suitable for industrial-grade printing. Furthermore, the larger the particle size of the fluorescent substance, the worse the dispersion stability, and the ink is prone to sedimentation, affecting the fluorescence and printing performance.

[0009] In the past two years, quantum dots have been used as fluorescent substances dispersed in ink for printing. However, quantum dots are expensive, highly selective for solvents, cannot be dispersed in UV systems, have poor stability, and have high environmental requirements, making them difficult to achieve industrial application.

[0010] Therefore, there is an urgent need for a UV-LED light-curable invisible anti-counterfeiting fluorescent inkjet ink suitable for inkjet printing, with long fluorescent life, good stability, fast curing speed, high adhesion, 100% solid content and no VOC, low price, and printable with a high-precision industrial piezoelectric nozzle. Summary of the Invention

[0011] The purpose of the present invention is to overcome the defect of fluorescent inkjet ink in the prior art that it cannot achieve UV rapid curing, and to provide a UV-LED light-curing invisible anti-counterfeiting fluorescent inkjet ink and its printed products that are suitable for inkjet printing, have a long fluorescent life, good stability, fast curing speed, high adhesion, are 100% solid and VOC-free, are low in price, and can be printed with a high-precision industrial piezoelectric nozzle.

[0012] In order to achieve the above-mentioned objectives, the first aspect of the present invention provides a UV-LED light-curable fluorescent inkjet ink, wherein the UV-LED light-curable fluorescent inkjet ink comprises 10-40 parts by weight of an acrylate prepolymer, 3-15 parts by weight of a photoinitiator, 20-80 parts by weight of a reactive diluent, 0.1-10 parts by weight of an aminoacrylic acid-modified organic phosphor, and 0.01-5 parts by weight of a leveling agent; the acrylate prepolymer is an amine-modified acrylate prepolymer; and the aminoacrylic acid-modified organic phosphor is one of aminoacrylic acid lanthanum and aminoacrylic acid terbium.

[0013] The second aspect of the present invention provides a method for preparing a printed product, which comprises: printing the UV-LED light-curing fluorescent inkjet ink described in the first aspect of the present invention onto a substrate through an industrial piezoelectric high-precision printing nozzle, and then curing it with a 365nm-405nm UV-LED curing light source to form a pattern on the substrate to obtain a printed product.

[0014] The third aspect of the present invention provides a printed matter, which includes a pattern formed by the method according to the second aspect of the present invention.

[0015] The UV-LED light-curable fluorescent inkjet ink of the present invention is invisible under sunlight after printing, and a bright fluorescent color is visible only when it is excited by ultraviolet light of a specific wavelength.

[0016] The UV-LED light-curable fluorescent inkjet ink described in this invention contains an amine-modified acrylate prepolymer. This amine-modified acrylic prepolymer provides an active amine component during the curing process, acting as a co-initiator and significantly improving the curing speed and adhesion of printed materials. It also exhibits excellent compatibility with aminoacrylic acid-modified phosphors, resulting in high ink stability.

[0017] Aminoacrylate-modified organic phosphors, modified with aminoacrylate, contain photocurable C=C and amino groups. This allows the phosphor to dissolve in the acrylic monomer and participate in the photocuring reaction, improving its aging resistance. Dissolved phosphors in ink are more stable than dispersed systems, making them less prone to problems such as nozzle clogging and uneven printing caused by precipitation and stratification.

[0018] The printed matter prepared by printing with the UV-LED light-curing fluorescent inkjet ink of the present invention has no VOC residue, high adhesion, high fluorescence intensity, strong aging resistance, and longer fluorescence life. DETAILED DESCRIPTION

[0019] The endpoints of the ranges and any values ​​disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoints of each range, the endpoints of each range and individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered to be specifically disclosed herein.

[0020] The first aspect of the present invention provides a UV-LED light-curable fluorescent inkjet ink, which contains 10-40 parts by weight of an acrylate prepolymer, 3-15 parts by weight of a photoinitiator, 20-80 parts by weight of a reactive diluent, 0.1-10 parts by weight of an aminoacrylic acid-modified organic phosphor, and 0.01-5 parts by weight of a leveling agent. The acrylate prepolymer is an amine-modified acrylate prepolymer. The aminoacrylic acid-modified organic phosphor is one of lanthanum aminoacrylate and terbium aminoacrylate. The amine-modified acrylic acid prepolymer can provide an active amine component during the curing process and be used as a co-initiator, thereby greatly improving the curing speed and the adhesion of the printed matter.

[0021] Preferably, when the UV-LED light-curing fluorescent inkjet ink contains 15-30 parts by weight of acrylate prepolymer, 4-10 parts by weight of photoinitiator, 40-70 parts by weight of active diluent, 1-5 parts by weight of aminoacrylic acid modified organic phosphor, and 0.1-2 parts by weight of leveling agent, the adhesion, fluorescence intensity and fluorescence aging resistance of the obtained printed matter can be further improved.

[0022] In the present invention, the amine-modified acrylate prepolymer is selected from at least one of an amine-modified polyurethane acrylate prepolymer, an amine-modified polyester acrylate prepolymer, and an amine-modified pure acrylate prepolymer. The amine-modified acrylic prepolymer having an amine value of 200-300 mgKOH / g, a Tg of 10-30, and a molecular weight of 2000-6000 can significantly improve printing smoothness.

[0023] In the present invention, the aminoacrylic acid-modified organic phosphor can be dissolved in a reactive diluent. After dissolution, its fluorescent luminescence intensity is higher, and the ink of the dissolved system is more stable than the ink of the dispersed system. However, the inventors of this application unexpectedly discovered in their research that the aminoacrylic acid-modified organic phosphor containing C=C and amino groups can participate in the reaction and be grafted onto a curable prepolymer. The steric hindrance effect between the acrylic acid and the phosphor makes the phosphor more difficult to decompose and age. Therefore, the fluorescent ink and the printed products prepared therefrom have better stability and fluorescence persistence, and excellent aging resistance. Therefore, the aminoacrylic acid-modified phosphor preferably contains photocurable groups C=C and amino groups. When the aminoacrylic acid-modified organic phosphor has an amino content of 5-20%, preferably 8-15%; when the aminoacrylic acid-modified organic phosphor has a C=C content of 10-30%, preferably 12-18%, the phosphor has better solubility, stronger luminescence intensity, and better aging resistance.

[0024] In the present invention, the photoinitiator can be any of various photoinitiators used in the prior art to initiate monomer polymerization reactions and can be commercially available. Preferably, the photoinitiator is selected from at least one of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, 2-phenylbenzyl-2-dimethylamine-1-(4-morpholinobenzylphenyl)butanone, benzoin dimethyl ether, and 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone.

[0025] In the present invention, the reactive diluent can be understood as a reactive monomer for polymerization. There are no special requirements for the reactive diluent and it can be obtained commercially. Preferably, the reactive diluent is selected from at least one of isooctyl acrylate, lauryl acrylate, hydroxyethyl methacrylate, glycidyl methacrylate, isopropyl methacrylate, 2-phenoxyethyl acrylate, 2-phenoxyethyl acrylate, 2-(2-ethoxyethoxy)ethyl acrylate, N-vinyl pyrrolidone, dipropylene glycol diacrylate, tripropylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, 1,6-hexanediol diacrylate, 1,4-butanediol diacrylate, tripropylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate.

[0026] In the present invention, the leveling agent is selected from polyether-modified siloxane containing acrylate functional groups; polyether-modified siloxane containing acrylate functional groups has better compatibility in photocurable inks and can participate in photocuring reactions. It is easier to migrate to the surface during the reaction process, making the bottom layer more firmly adhered, the surface smoother, and having excellent scratch resistance.

[0027] In the present invention, the UV-LED light-curable fluorescent inkjet ink has a viscosity of 4-30 mPas at 25°C and a dynamic surface tension of 20-23 mN / m within 30 ms. The ink achieves optimal printing smoothness, with no broken lines or ink flying defects even after printing 10 square meters. The printed pattern exhibits excellent leveling, high image resolution, and high fluorescent intensity.

[0028] The second aspect of the present invention provides a method for preparing a printed product, which comprises: printing the UV-LED light-curing fluorescent inkjet ink described in the first aspect of the present invention onto a substrate through an industrial piezoelectric high-precision printing nozzle, and then curing it with a 365nm-405nm UV-LED curing light source to form a pattern on the substrate to obtain a printed product.

[0029] In the present invention, the industrial piezoelectric high-precision printing nozzle is selected from one of the industrial piezoelectric printing heads of Epson, Xaar, Ricoh, Komei, Starlight, Kyocera, Spectra, and Fuji.

[0030] In the present invention, the light-curing light source is an environmentally friendly UV-LED light source. Preferably, the light source is selected from light sources with wavelengths of 365nm, 375nm, 385nm, 395nm, and 405nm. The UV-LED light source can be a single wavelength light source or a mixed light source with multiple wavelengths. Preferably, the light-curing light source is a mixed light source with wavelengths of 385nm and 395nm. Preferably, the ratio of the number of lamp beads in the 385nm and 395nm light sources is 1:1.

[0031] The third aspect of the present invention provides a printed matter, which includes a pattern formed by the method described in the second aspect of the present invention.

[0032] The UV-LED light-curable fluorescent inkjet ink described in the present invention is solvent-free and 100% solids. It is solvent-free and suitable for high-precision industrial piezoelectric inkjet printing, offering smooth printing. The ink offers fast curing, excellent adhesion, stability, and low price, and produces printed products with high fluorescence intensity and a long fluorescence life. The ink is colorless under fluorescent light and can be printed on the surface of a colored layer without affecting the underlying pattern or color, resulting in excellent anti-counterfeiting properties. Its beneficial effects are as follows:

[0033] (1) The ink does not contain solvents and is a 100% solid content UV-LED light curing ink with no solvent volatilization and no VOC;

[0034] (2) The prepolymer Tg, molecular weight, viscosity, and dynamic surface tension of the ink are suitable for high-precision industrial piezoelectric nozzle inkjet printing, and the printing fluency is good;

[0035] (3) The ink uses amine-modified acrylate prepolymer, which has a fast curing speed. When the amine value is 200-300 mgKOH / g, it can be fully cured within 30ms;

[0036] (4) Aminoacrylic acid modified organic phosphor contains photocurable groups C=C and amino groups, which can be dissolved in reactive diluents. After dissolution, its fluorescence intensity is higher. The ink is a dissolving system with good stability. It will not agglomerate due to unstable dispersion, which will clog the nozzle.

[0037] (5) The photocurable groups of amino acrylic acid modified organic phosphors can participate in the photocuring reaction and be grafted onto the curable prepolymer. The steric hindrance effect of acrylic acid and phosphors makes it more difficult to decompose the phosphors. Therefore, the fluorescent ink and the printed products prepared therefrom have better stability and fluorescence persistence, and excellent aging resistance.

[0038] The present invention will be described in detail below through examples.

[0039] Example 1

[0040] UV-LED light-curable fluorescent inkjet ink A1 was prepared by mixing 28 parts by weight of an amine-modified polyurethane acrylate prepolymer (amine value 230 mgKOH / g, Tg 15, molecular weight 4500), 62 parts by weight of a reactive diluent (dipropylene glycol diacrylate), 6 parts by weight of a photoinitiator ((2,4,6-trimethylbenzoyl)diphenylphosphine oxide), 3 parts by weight of lanthanum aminoacrylate (amino content 10%, C=C content 15%), and 1 part by weight of a polyether-modified siloxane containing acrylate functional groups. After stirring and dissolving, the mixture was filtered. Its performance parameters are shown in Table 1.

[0041] Using a Ricoh G5 printhead, the ink was printed onto paper according to the print file. After curing with a mixed UV-LED light source (385nm and 395nm lamps in a 1:1 ratio), a pattern was formed on the substrate to produce print B1. Its performance parameters are shown in Table 2.

[0042] Example 2

[0043] 25 parts by weight of an amine-modified pure acrylate prepolymer (amine value 280 mgKOH / g, Tg 25, molecular weight 5800), 60 parts by weight of a reactive diluent (30 parts by weight of 2-phenoxyethyl acrylate and 30 parts by weight of pentaerythritol triacrylate), 9 parts by weight of a photoinitiator ((2,4,6-trimethylbenzoyl)diphenylphosphine oxide), 4 parts by weight of terbium aminoacrylate (amino content 12%, C=C content 16%), and 2 parts by weight of an acrylate-functional polyether-modified siloxane were mixed and stirred to dissolve, followed by filtration to obtain UV-LED light-curable fluorescent inkjet ink A2. Its performance parameters are shown in Table 1.

[0044] Using an Epson S3200 printhead, the ink was printed on paper according to the print file. After being cured by a 385nm UV-LED light source, a pattern was formed on the substrate to obtain printed product B2. Its performance parameters are shown in Table 2.

[0045] Example 3

[0046] 10 parts by weight of amine-modified pure acrylate prepolymer (amine value 220 mgKOH / g, Tg of 25, molecular weight of 1500) and 15 parts by weight of amine-modified polyurethane acrylate prepolymer (amine value 220 mgKOH / g, Tg of 12, molecular weight of 3800), 66 parts by weight of reactive diluent (20 parts by weight of 2-phenoxyethyl acrylate, 20 parts by weight of N-vinyl pyrrolidone and 26 parts by weight of pentaerythritol triacrylate) were mixed. UV-LED light-curable fluorescent inkjet ink A3 was obtained by mixing and stirring 7 parts by weight of a photoinitiator (4 parts by weight of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide and 3 parts by weight of 2-methyl-1-(4-methylthiophenyl)-2-morpholino-1-propanone), 1.5 parts by weight of lanthanum aminoacrylate (amino content: 10%, C=C content: 13%), and 0.5 parts by weight of a polyether-modified siloxane containing an acrylate functional group. The mixture was dissolved and filtered to obtain the UV-LED light-curable fluorescent inkjet ink A3. Its performance parameters are shown in Table 1.

[0047] Using an Epson S3200 printhead, the ink was printed on paper according to the print file. After being cured by a 395nm UV-LED light source, a pattern was formed on the substrate to obtain printed product B3. Its performance parameters are shown in Table 2.

[0048] Example 4

[0049] UV-LED light-curable fluorescent inkjet ink A4 was prepared by mixing 40 parts by weight of an amine-modified polyester acrylic prepolymer (amine value 260 mgKOH / g, Tg 30, molecular weight 2200), 47 parts by weight of a reactive diluent (20 parts by weight of 1,6-hexanediol diacrylate and 17 parts by weight of dipropylene glycol diacrylate), 2 parts by weight of a photoinitiator (2-phenylbenzyl-2-dimethylamino-1-(4-morpholinobenzylphenyl)butanone), 8 parts by weight of lanthanum aminoacrylate (amino content 10%, C=C content 15%), and 3 parts by weight of a polyether-modified siloxane containing acrylate functional groups. The mixture was stirred and dissolved, and then filtered to obtain the UV-LED light-curable fluorescent inkjet ink. Its performance parameters are shown in Table 1.

[0050] The ink was printed on paper using a Kemei 1024 printhead according to the print file. After curing with a 395nm UV-LED light source, a pattern was formed on the substrate to produce a B4 print. The performance parameters are shown in Table 2.

[0051] Example 5

[0052] A UV-LED light-curable fluorescent inkjet ink was prepared according to the method of Example 1, except that the amine-modified polyurethane acrylate prepolymer (amine value 230 mgKOH / g, Tg 15, molecular weight 4500) was replaced with an amine-modified polyurethane acrylate prepolymer (amine value 80 mgKOH / g, Tg 60, molecular weight 9000). UV-LED light-curable fluorescent inkjet ink A5 was obtained. Its performance parameters are shown in Table 1.

[0053] Using a Ricoh G5 printhead, the ink was printed onto paper according to the print file. After curing with a mixed UV-LED light source (385nm and 395nm lamps in a 1:1 ratio), a pattern was formed on the substrate to produce a printed product B5. Its performance parameters are shown in Table 2.

[0054] Example 6

[0055] A UV-LED light-curable fluorescent inkjet ink was prepared according to the method of Example 1, except that lanthanum aminoacrylate (amino content: 10%, C=C content: 15%) was replaced with lanthanum aminoacrylate (amino content: 3%, C=C content: 8%). UV-LED light-curable fluorescent inkjet ink A6 was obtained. Its performance parameters are shown in Table 1.

[0056] Using a Ricoh G5 printhead, the ink was printed onto paper according to the print file. After curing with a mixed UV-LED light source (385nm and 395nm lamps in a 1:1 ratio), a pattern was formed on the substrate to produce printed product B6. Its performance parameters are shown in Table 2.

[0057] Example 7

[0058] A UV-LED light-curable fluorescent inkjet ink was prepared according to the method of Example 1, except that the polyether-modified siloxane containing acrylate functional groups was replaced with polyether-modified siloxane to obtain UV-LED light-curable fluorescent inkjet ink A7. Its performance parameters are shown in Table 1.

[0059] Using a Ricoh G5 printhead, the ink was printed onto paper according to the print file. After curing with a mixed UV-LED light source (385nm and 395nm lamps in a 1:1 ratio), a pattern was formed on the substrate, resulting in print B7. Its performance parameters are shown in Table 2.

[0060] Comparative Example 1

[0061] A UV-LED light-curable fluorescent inkjet ink was prepared according to the method of Example 1, except that the amine-modified polyurethane acrylate prepolymer (amine value 230 mgKOH / g, Tg of 15, molecular weight 4500) was replaced with a polyurethane acrylate prepolymer (Tg of 20, molecular weight 2000). UV-LED light-curable fluorescent inkjet ink A8 was obtained. Its performance parameters are shown in Table 1.

[0062] Using a Ricoh G5 printhead, the ink was printed onto paper according to the print file. After curing with a mixed UV-LED light source (385nm and 395nm lamps in a 1:1 ratio), a pattern was formed on the substrate, resulting in print B8. Its performance parameters are shown in Table 2.

[0063] Comparative Example 2

[0064] UV-LED light-curable fluorescent inkjet ink A9 was prepared according to the method of Example 1, except that the organolanthanum was not modified with aminoacrylic acid. The performance parameters of the UV-LED light-curable fluorescent inkjet ink A9 are shown in Table 1.

[0065] Using a Ricoh G5 printhead, the ink was printed onto paper according to the print file. After curing with a mixed UV-LED light source (385nm and 395nm lamps in a 1:1 ratio), a pattern was formed on the substrate to produce print B9. Its performance parameters are shown in Table 2.

[0066] Test Case

[0067] The performance tests of the UV-LED light-curable fluorescent inkjet inks prepared in the above embodiments are as follows:

[0068] (1) Viscosity test

[0069] Testing equipment: Rheometer (Anton Paar Shanghai Trading Co., Ltd.), model: MCR 302

[0070] (2) Dynamic surface tension test

[0071] Testing equipment: Dynamic surface tension meter (Wengkaier (Shanghai) International Trading Co., Ltd.), model: SITA t15

[0072] (3) Adhesion test

[0073] Test method: 100-grid test (level 0 is the best adhesion, level 5 is the worst adhesion)

[0074] (4) Curing speed

[0075] Test method: Print the ink on the substrate and cure it under an 8W UV-LED light source. The time it takes for the ink to completely cure is the curing speed.

[0076] (5) Printing smoothness

[0077] Test method: The ink is continuously printed on the printer. The number of broken lines when printing a 10 square meter pattern is the printing fluidity of the ink. The more broken lines there are, the worse the ink fluidity is.

[0078] (6) Fluorescence intensity

[0079] Testing equipment: Confocal microscope

[0080] (7) Aging resistance test

[0081] After the cured ink is aged for 100 hours under a 5KW xenon lamp, the change in fluorescence intensity before and after aging is tested. A change value of less than 100 is rated as level 0, a change value between 100-200 is rated as level 1, a change value between 200-300 is rated as level 2, a change value between 300-400 is rated as level 3, a change value between 400-500 is rated as level 4, and a change value greater than 500 is rated as level 5.

[0082] Table 1

[0083] Sample A1 A2 A3 A4 A5 A6 A7 A8 A9 Viscosity / mPas 18 10 8 12 20 23 21 28 25 30 ms dynamic surface tension mN / m 21.2 21.8 20.9 22.3 22.8 22.5 22.4 24.5 26.1 Curing speed / ms 12 18 15 25 28 28 28 120 98

[0084] Table 2

[0085] Sample Print flowability (10 m2 number of broken lines) Adhesion Fluorescence intensity Fluorescence aging resistance B1 0 roots 0 class 5246 0 class B2 1 root 0 class 4892 0 class B3 0 roots 0 class 5026 0 class B4 2 roots 1 class 4303 0 class B5 5 roots 1 class 4220 1 class B6 4 roots 1 class 4015 1 class B7 5 roots 2 class 4236 1 class B8 21 roots 5 class 909 5 class B9 14 roots 5 class 612 5 class

[0086] It can be seen from the data in Table 1 and Table 2 that the UV-LED light-curable fluorescent inkjet ink of the present invention has a fast curing speed and can be completely cured within 30ms. The obtained printed products have good printing smoothness, the number of broken lines in continuous printing of 10 square meters is no more than 5, the adhesion is excellent, the fluorescence intensity is high, and the fluorescence aging resistance is excellent.

[0087] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A UV-LED light-curable fluorescent inkjet ink, characterized in that: The UV-LED light-curing fluorescent inkjet ink contains 10-40 parts by weight of an acrylate prepolymer, 3-15 parts by weight of a photoinitiator, 20-80 parts by weight of a reactive diluent, 0.1-10 parts by weight of an aminoacrylic acid-modified organic phosphor, and 0.01-5 parts by weight of a leveling agent; the acrylate prepolymer is an amine-modified acrylate prepolymer; and the aminoacrylic acid-modified organic phosphor is one of lanthanum aminoacrylate and terbium aminoacrylate. Wherein, the amino acrylic acid modified organic phosphor contains a photocurable group C=C and an amino group; The amino acrylic acid modified organic phosphor has an amino content of 5-20% and a C=C content of 10-30%; The amine value of the amine-modified acrylate prepolymer is 200-300 mgKOH / g, the glass transition temperature Tg is 10-30° C., and the molecular weight is 2000-6000.

2. The UV-LED light-curable fluorescent inkjet ink according to claim 1, characterized in that: The UV-LED light-curable fluorescent inkjet ink contains 15-30 parts by weight of acrylate prepolymer, 4-8 parts by weight of photoinitiator, 30-60 parts by weight of active diluent, 0.5-3 parts by weight of aminoacrylic acid modified organic phosphor, and 0.05-1 part by weight of leveling agent.

3. The UV-LED light curing fluorescent inkjet ink according to claim 1, characterized in that: The amine-modified acrylate prepolymer is selected from at least one of amine-modified polyurethane acrylate prepolymer, amine-modified polyester acrylate prepolymer, and amine-modified pure acrylate prepolymer.

4. The UV-LED light-curable fluorescent inkjet ink according to claim 1, characterized in that: The amino acrylic acid modified organic phosphor has an amino content of 8-15% and a C=C content of 12-18%.

5. The UV-LED light-curable fluorescent inkjet ink according to claim 1, characterized in that: The leveling agent is selected from polyether-modified siloxane containing acrylate functional groups.

6. The UV-LED light-curable fluorescent inkjet ink according to any one of claims 1 to 5, characterized in that: The viscosity of the ink at 25°C is 4-30 ; The dynamic surface tension of the ink within 30 ms is 20-23 mN / m.

7. A method for preparing a printed matter, the method comprising: The UV-LED light-curable fluorescent inkjet ink according to any one of claims 1 to 6 is printed onto a substrate through an industrial piezoelectric high-precision printing nozzle, and then cured by a 365nm-405nm UV-LED curing light source to form a pattern on the substrate to obtain a printed product.

8. A printed matter comprising a pattern formed by the method according to claim 7.