A thermally foamed anti-counterfeiting inkjet ink and its preparation method

Abstract

This invention belongs to the field of printing consumables technology, specifically relating to a thermally foamed anti-counterfeiting inkjet ink. The thermally foamed anti-counterfeiting inkjet ink comprises an organic fluorescent dye, a solvent, a humectant, a resin, and additives; the solvent includes at least one selected from ethanol, n-propanol, isopropanol, n-butanol, and dimethyl acetate; the humectant includes at least one selected from ethylene glycol, diethylene glycol, and glycerin; and the resin includes rosin resin or modified rosin resin. The thermally foamed anti-counterfeiting inkjet ink has advantages such as extremely low viscosity and surface tension, and good continuous printing performance.

Description

Technical Field

[0001] This invention belongs to the field of printing consumables technology, specifically relating to a thermally foamed anti-counterfeiting inkjet ink and its preparation method. Background Technology

[0002] Fluorescent anti-counterfeiting ink is one of the most widely used chemical anti-counterfeiting inks in modern anti-counterfeiting packaging printing. It is suitable for anti-counterfeiting packaging printing of official documents, securities, certificates, and high-end cigarettes, alcohol, food, pharmaceuticals, cosmetics, and other brand-name products. The anti-counterfeiting principle is to add visible fluorescent luminescent materials that are excited by ultraviolet light to the ink. Because these inks contain certain fluorescent luminescent materials, the anti-counterfeiting feature is that the printed matter will show red, yellow, green, and blue (400-800nm) visible light under ultraviolet light (200-400nm). Because colorless fluorescent ink is invisible and colorless when there is no ultraviolet light illumination, it does not affect the overall light of the image and has excellent concealment. It is now widely used. This is currently the fastest-growing high technology. The development of this type of ink is difficult, and the formula is often kept secret.

[0003] The main component of fluorescent ink is fluorescent dye, which is a type of functional luminescent pigment. When these pigments are irradiated with light (including ultraviolet light), they absorb a certain form of energy, which is not converted into heat energy, but rather excites photons and releases the absorbed energy in the form of low-energy visible light, thus producing fluorescence of different hues. Different colors of light combine to form exceptionally bright colors, and the luminescence disappears when the light stops shining; hence the name fluorescent dye.

[0004] Thermal inkjet printing works by heating ink to boiling point using an electrothermal element controlled by a recording signal, generating bubbles that are then ejected as ink droplets. The ink used in thermal instant inkjet printing must have extremely low viscosity and surface tension to allow it to be easily ejected from small nozzles.

[0005] The mechanism of thermal instant inkjet printing involves an ink chamber filled with ink, containing a heating plate on one side and nozzles on the other. The ink is rapidly heated to a temperature exceeding the ink's boiling point. Ink in direct contact with the heating plate vaporizes, forming bubbles. These bubbles fill the ink chamber, causing ink droplets to be ejected from the nozzles. Once the droplets are ejected, the heating plate cools, and the ink chamber is refilled by the ink reservoir through capillary action. The cooling of the heating plate and the refilling of ink are completed in a fraction of a second. Precise control is achieved by forming four million tiny 15µm ink droplets per second through the inkjet nozzles.

[0006] In continuous inkjet printing, some of the ejected ink will inevitably remain on the perforated plate (the area outside the printhead near the nozzle). Ink accumulation near the nozzle can cause newly formed droplets to lose momentum, leading to printing errors or completely blocking the jetting process.

[0007] Therefore, there is an urgent need for a thermal inkjet ink with extremely low viscosity and surface tension, and good continuous printing performance. Summary of the Invention

[0008] To address the aforementioned technical problems, the present invention provides the following technical solutions.

[0009] In a first aspect, the present invention provides a thermally foamed anti-counterfeiting inkjet ink.

[0010] A thermally foamed anti-counterfeiting inkjet ink includes a fluorescent dye, a solvent, a humectant, a resin, and additives; the solvent includes at least one of ethanol, n-propanol, isopropanol, n-butanol, and dimethyl acetate; the humectant includes at least one of ethylene glycol, diethylene glycol, and glycerin; and the resin includes rosin resin or modified rosin resin.

[0011] In some embodiments, the fluorescent dye includes an organic fluorescent dye.

[0012] In some embodiments, the fluorescent dye includes at least one of DF-blue, DF-red, DF-yellow, and DF-green.

[0013] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate.

[0014] In some embodiments, the humectant is ethylene glycol.

[0015] In some embodiments, the adjuvant includes a surfactant.

[0016] In some embodiments, the surfactant includes at least one of Dow Corning DC27, Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO 435. In some embodiments, the surfactant is Dow Corning DC27.

[0017] In some embodiments, the resin comprises at least one selected from rosin resin, modified rosin resin AQ01, hydrogenated rosin resin, water-white rosin resin, and terpene rosin resin. In some embodiments, the resin comprises modified rosin resin AQ01.

[0018] In some embodiments, the content of the organic fluorescent dye is 0.10 wt% to 1.00 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink. In some embodiments, the content of the organic fluorescent dye is 0.10 wt%, 0.50 wt%, or 1.00 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink.

[0019] In some embodiments, the content of the humectant is 1.00 wt% to 5.00 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink. In some embodiments, the content of the humectant is 1.00 wt%, 2.00 wt%, 3.00 wt%, 4.00 wt%, or 5.00 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink.

[0020] In some embodiments, the resin content is 3.00 wt% to 15.00 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink. In some embodiments, the resin content is 5.00 wt% to 15.00 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink. In some embodiments, the resin content is 3.00 wt%, 4.00 wt%, 5.00 wt%, 6.00 wt%, 7.00 wt%, 8.00 wt%, 9.00 wt%, 10.00 wt%, 11.00 wt%, 12.00 wt%, 13.00 wt%, 14.00 wt%, or 15.00 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink.

[0021] In some embodiments, the content of the additive is 0.05 wt% to 0.20 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink. In some embodiments, the content of the additive is 0.10 wt% to 0.20 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink. In some embodiments, the content of the additive is 0.05 wt%, 0.10 wt%, 0.15 wt%, or 0.20 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink.

[0022] In some embodiments, the solvent content is 78.80 wt%-95.85 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink. In some embodiments, the solvent content is 78.80 wt%-93.70 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink. In some embodiments, the solvent content is 78.80 wt%, 80.00 wt%, 85.00 wt%, 87.40 wt%, 90.00 wt%, or 93.70 wt% based on the total mass of the thermally foamed anti-counterfeiting inkjet ink.

[0023] In some embodiments, based on the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.10wt% to 1.00wt%, the content of the humectant is 1.00wt% to 5.00wt%, the content of the resin is 3.00wt% to 15.00wt%, the content of the additive is 0.05wt% to 0.20wt%, and the balance is solvent.

[0024] In some embodiments, based on the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.10wt% to 1.00wt%, the content of the humectant is 1.00wt% to 5.00wt%, the content of the resin is 5.00wt% to 15.00wt%, the content of the additive is 0.10wt% to 0.20wt%, and the balance is solvent.

[0025] In some embodiments, the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is (30.00–60.00): (5.00–30.00): (10.00–40.00).

[0026] In some embodiments, the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is (33.80-48.70):(15.00-30.00):(15.00-30.00).

[0027] In some embodiments, the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is 42.40:20.00:25.00, 48.70:15.00:30.00, or 33.80:30.00:15.00.

[0028] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate, and the humectant is ethylene glycol; the adjuvants include Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO... At least one of 435; the resin includes at least one of rosin resin, modified rosin resin AQ01, hydrogenated rosin resin, water-white rosin resin, and terpene rosin resin; calculated by the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.10wt% to 1.00wt%, the content of the humectant is 1.00wt% to 5.00wt%, the content of the resin is 3.00wt% to 15.00wt%, the content of the auxiliary agent is 0.05wt% to 0.20wt%, and the balance is solvent; the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is (30.00 to 60.00): (5.00 to 30.00): (10.00 to 40.00) or (33.80 to 48.70): (15.00 to 30.00): (15.00 to 30.00).

[0029] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate, and the humectant is ethylene glycol; the adjuvant includes surfactants; the surfactants include Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO... At least one of 435; the resin includes at least one of rosin resin, modified rosin resin AQ01, hydrogenated rosin resin, water-white rosin resin, and terpene rosin resin; calculated by the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.10wt% to 1.00wt%, the content of the humectant is 1.00wt% to 5.00wt%, the content of the resin is 5.00wt% to 15.00wt%, the content of the auxiliary agent is 0.10wt% to 0.20wt%, and the balance is solvent; the mass ratio of ethanol, n-propanol, and dimethyl acetate in the solvent is (40.00 to 45.00):(15.00 to 25.00):(20.00 to 30.00) or 42.40:20.00:25.00.

[0030] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate, and the humectant is ethylene glycol; the auxiliary agent is at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO 435; the resin includes at least one of rosin resin, modified rosin resin AQ01, hydrogenated rosin resin, water-white rosin resin, and terpene rosin resin; based on the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.50 wt%, the content of the humectant is 2.00 wt%, the content of the resin is 10.00 wt%, the content of the auxiliary agent is 0.10 wt%, and the balance is solvent; the mass ratio of ethanol, n-propanol, and dimethyl acetate in the solvent is 42.40:20.00:25.00.

[0031] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate, and the humectant is ethylene glycol; the auxiliary agent is at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO 435; the resin includes at least one of rosin resin, modified rosin resin AQ01, hydrogenated rosin resin, water-white rosin resin, and terpene rosin resin; based on the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.10 wt%, the content of the humectant is 1.00 wt%, the content of the resin is 5.00 wt%, the content of the auxiliary agent is 0.20 wt%, and the balance is solvent; the mass ratio of ethanol, n-propanol, and dimethyl acetate in the solvent is 48.70:15.00:30.00.

[0032] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate, and the humectant is ethylene glycol; the auxiliary agent is at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO 435; the resin includes at least one of rosin resin, modified rosin resin AQ01, hydrogenated rosin resin, water-white rosin resin, and terpene rosin resin; based on the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 1.00 wt%, the content of the humectant is 5.00 wt%, the content of the resin is 15.00 wt%, the content of the auxiliary agent is 0.20 wt%, and the balance is solvent; the mass ratio of ethanol, n-propanol, and dimethyl acetate in the solvent is 33.80:30.00:15.00.

[0033] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate, and the humectant is ethylene glycol; the adjuvants include Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO... At least one of 435; the resin is modified rosin resin AQ01; calculated based on the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.10wt% to 1.00wt%, the content of the humectant is 1.00wt% to 5.00wt%, the content of the resin is 3.00wt% to 15.00wt%, the content of the auxiliary agent is 0.05wt% to 0.20wt%, and the remainder is solvent; the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is (30.00 to 60.00): (5.00 to 30.00): (10.00 to 40.00) or (33.80 to 48.70): (15.00 to 30.00): (15.00 to 30.00).

[0034] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate, and the humectant is ethylene glycol; the adjuvant includes surfactants; the surfactants include Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO... At least one of 435; the resin is modified rosin resin AQ01; calculated by the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.10wt% to 1.00wt%, the content of the humectant is 1.00wt% to 5.00wt%, the content of the resin is 5.00wt% to 15.00wt%, the content of the auxiliary agent is 0.10wt% to 0.20wt%, and the balance is solvent; the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is (40.00 to 45.00):(15.00 to 25.00):(20.00 to 30.00) or 42.40:20.00:25.00.

[0035] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate; the humectant is ethylene glycol; the auxiliary agent is at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO 435; the resin is modified rosin resin AQ01; based on the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.50 wt%, the content of the humectant is 2.00 wt%, the content of the resin is 10.00 wt%, the content of the auxiliary agent is 0.10 wt%, and the balance is solvent; the mass ratio of ethanol, n-propanol, and dimethyl acetate in the solvent is 42.40:20.00:25.00.

[0036] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate; the humectant is ethylene glycol; the auxiliary agent is at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO 435; the resin is modified rosin resin AQ01; based on the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 0.10 wt%, the content of the humectant is 1.00 wt%, the content of the resin is 5.00 wt%, the content of the auxiliary agent is 0.20 wt%, and the balance is solvent; the mass ratio of ethanol, n-propanol, and dimethyl acetate in the solvent is 48.70:15.00:30.00.

[0037] In some embodiments, the solvent is ethanol, n-propanol, and dimethyl acetate; the humectant is ethylene glycol; the auxiliary agent is at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, and TEGO 435; the resin is modified rosin resin AQ01; based on the total mass of the thermally foamed anti-counterfeiting inkjet ink, the content of the organic fluorescent dye is 1.00 wt%, the content of the humectant is 5.00 wt%, the content of the resin is 15.00 wt%, the content of the auxiliary agent is 0.20 wt%, and the balance is solvent; the mass ratio of ethanol, n-propanol, and dimethyl acetate in the solvent is 33.80:30.00:15.00.

[0038] Secondly, the present invention provides a method for preparing the thermally foamed anti-counterfeiting inkjet ink described in the first aspect.

[0039] A method for preparing the thermally foamed anti-counterfeiting inkjet ink of the first aspect comprises: mixing an organic fluorescent dye, a solvent, a humectant, a resin and an additive, stirring until the organic fluorescent dye is completely dissolved, filtering, and obtaining the thermally foamed anti-counterfeiting inkjet ink.

[0040] In some embodiments, the filtration is performed through filter paper with a pore size of 0.45 micrometers to 5 micrometers (e.g., 0.45 micrometers, 1 micrometer, 2 micrometers, 3 micrometers, 4 micrometers, or 5 micrometers).

[0041] Beneficial effects

[0042] Compared with the prior art, a certain embodiment of the present invention includes at least one of the following beneficial effects:

[0043] (1) The thermally foamed inkjet ink provided by the present invention has good printing performance, extremely low viscosity and surface tension, good continuous printing performance, good adhesion, aging resistance, and good cap opening performance.

[0044] (2) Compared with other solvents, the solvents (ethanol, n-propanol and dimethyl acetate) provided by the present invention are beneficial to improving the opening performance and adhesion of the obtained thermal foaming anti-counterfeiting inkjet ink.

[0045] (3) Compared with other humectants, the humectant (ethylene glycol) provided by the present invention is beneficial to improving the opening performance and adhesion of the obtained thermal foaming anti-counterfeiting inkjet ink.

[0046] (4) Compared with other resins, the resin provided by the present invention (such as modified rosin resin AQ01) is beneficial to improving the printing performance, continuous printing performance, cap opening performance, aging resistance and adhesion of the obtained thermal foaming anti-counterfeiting inkjet ink.

[0047] Terminology definition:

[0048] In the foregoing description of this invention, all figures disclosed herein, whether or not the words “approximately” or “about” are used, are approximate values. Based on the disclosed figures, the value of each figure may vary by less than ±10% or by a difference that is considered reasonable by those skilled in the art, such as ±1%, ±2%, ±3%, ±4%, or ±5%.

[0049] In this invention, room temperature or ambient temperature refers to the ambient temperature, which can be 20℃-30℃; in some embodiments, it is 22℃-28℃; in some embodiments, it is 24℃-26℃; and in some embodiments, it is 25℃.

[0050] The terms "above", "below", and "within" are understood to include the number itself. For example, "two or more" means ≥ two.

[0051] The term “and / or” should be understood to mean any one of the options or any combination of two or more of the options.

[0052] The term "lid-open time" refers to the amount of time a printer can remain dormant and not printing, and then, upon resuming printing, all characters in the first code are visible and fully legible. For example, if the published lid-open time is 1 hour, the printout is fully legible at the 1-hour test point. Therefore, the lid-open time will be at least 1 hour. The actual lid-open time may exceed 1 hour.

[0053] The term "wt%" represents a percentage by mass.

[0054] The term "more" indicates a quantity of 2 or more, such as 2, 3, 4 or 5, etc.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples. Detailed Implementation

[0056] The following embodiments are further illustrations of the present invention, but are not intended to limit the scope of the invention.

[0057] All technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The use of "and" or "or" in this invention includes any and all combinations of one or more of the associated listed items.

[0058] All reagents used in this invention can be purchased commercially or prepared by the methods described in this invention.

[0059] The fluorescent dyes described in this invention embodiment can be products of Shenzhen Oriental Color Changing Technology Co., Ltd., and are available in blue, red, yellow, and green models: Blue organic fluorescent dye model: DF-Blue; Red organic fluorescent dye model: DF-Red; Yellow organic fluorescent dye model: DF-Yellow; Green organic fluorescent dye model: DF-Green.

[0060] Unless otherwise stated, the resins described in this invention are of the following types and manufacturers: rosin resin type: AS10 (manufacturer: Shenzhen Yoshida Chemical Co., Ltd.); hydrogenated rosin resin type: AQ02 (manufacturer: Shenzhen Yoshida Chemical Co., Ltd.); water-white rosin resin AS01 (manufacturer: Shenzhen Yoshida Chemical Co., Ltd.); terpene rosin resin type: T105 (manufacturer: Shenzhen Yoshida Chemical Co., Ltd.).

[0061] Unless otherwise stated, the resins described in the following examples or comparative examples are of the following types and manufacturers: modified rosin resin type: AQ01 (manufacturer: Shenzhen Yoshida Chemical Co., Ltd.); phenolic resin type: 210 (manufacturer: Shenzhen Yoshida Chemical Co., Ltd.); polypropylene resin CPP833S (manufacturer: Shenzhen Yoshida Chemical Co., Ltd.).

[0062] Examples 1-3: Preparation of Thermal Inkjet Ink

[0063] Formula: See Table 1.

[0064] Table 1: Thermal Inkjet Ink Formulations

[0065]

[0066]

[0067] Preparation method: Mix organic fluorescent dye, solvent, humectant, resin and additives, stir until the organic fluorescent dye is completely dissolved, filter through filter paper with a pore size of 1 micrometer to obtain the thermal foaming anti-counterfeiting inkjet ink.

[0068] Comparative Examples 1-4: Investigation of Solvents

[0069] Formula: See Table 2.

[0070] Table 2: Solvent formulations under investigation

[0071]

[0072]

[0073] Preparation method: Same as in Example 1.

[0074] Comparative Examples 5-7: Examination of Moisturizers

[0075] Formula: See Table 3.

[0076] Table 3: Formulations of Moisturizers for Evaluation

[0077]

[0078] Preparation method: Same as in Example 1.

[0079] Comparative Examples 8-10: Examination of Resins

[0080] Formula: See Table 4.

[0081] Table 4: Resin formulations for evaluation

[0082]

[0083] Example 4: Performance Evaluation

[0084] 1. Viscosity test

[0085] The viscosity of the thermally bubbling inkjet inks obtained in the above examples and comparative examples was tested at 25°C. The results are shown in Table 5.

[0086] 2. Surface tension

[0087] The surface tension of the thermally bubbling inkjet inks obtained in the above examples and comparative examples was tested at 25°C. The results are shown in Table 5.

[0088] 3. Printing performance

[0089] The thermal inkjet inks obtained in the above embodiments and comparative examples were printed using a high-resolution inkjet printer (model: MoEco2000, manufacturer: Shengjiefeng Marking Technology (Xiamen) Co., Ltd.). The pattern condition was then tested under LED ultraviolet light. The results are shown in Table 5. "Pass" indicates that the pattern is complete and there are no defects such as missing frames, skewed printing, trailing, or scattered dots. "Fail" indicates that the pattern is incomplete and has at least one of the defects such as missing frames, skewed printing, trailing, or scattered dots.

[0090] 4. Storage and continuous printing performance tests at 4-5℃

[0091] The thermal inkjet inks obtained in the above embodiments and comparative examples were stored at 5°C for 4 weeks, and continuous printing tests were performed in an environment with a controllable temperature of 5°C at a constant printing speed of one code per second. Each test lasted for 20 hours, and the printing pattern effect at different times was observed. "Pass" means that the pattern is complete and there are no defects such as missing frames, skewed printing, trailing, or scattered dots; "Fail" means that the pattern is incomplete and there is at least one of the defects such as missing frames, skewed printing, trailing, or scattered dots. The results are shown in Table 5.

[0092] 5. 5℃ lid opening performance test

[0093] After 20 hours of continuous printing following the 5℃ storage and continuous printing performance test, a 1-hour lid opening time test was performed at 5℃ without cleaning the nozzle plate. The results are shown in Table 5.

[0094] 6. Storage and continuous printing performance test at 40℃

[0095] The thermal inkjet inks obtained in the above embodiments and comparative examples were stored at 40°C for 4 weeks, and continuous printing tests were performed in an environment with a controllable temperature of 40°C at a constant printing speed of one code per second. Each test lasted for 20 hours, and the printing pattern effect at different times was observed. "Pass" means that the pattern is complete under LED ultraviolet light irradiation and there are no defects such as missing frames, skewed printing, trailing, or scattered dots; "Fail" means that the pattern is incomplete under LED ultraviolet light irradiation and there is at least one of the defects such as missing frames, skewed printing, trailing, or scattered dots. The results are shown in Table 5.

[0096] 7. 40℃ lid opening performance test

[0097] After 20 hours of continuous printing following the 40℃ storage and continuous printing performance test, a 1-hour lid opening time test was performed at 40℃ without cleaning the nozzle plate. The results are shown in Table 5.

[0098] 8. Aging resistance test

[0099] Patterns printed with the thermal inkjet inks obtained in the above examples and comparative examples were irradiated with a 6000W xenon lamp for 3 months, and the condition of the samples was observed. The results are shown in Table 5.

[0100] 9. Adhesion test

[0101] Adhesion: Adhesion characterizes the ability of a film layer to bond with the surface of the substrate through physical and chemical interactions.

[0102] Test Method: The 3M tape peel test method was used to test the ink adhesion performance. Anti-counterfeiting inkjet ink was injected into the cartridge, loaded onto the printer, and the pattern to be printed was edited. The ink was then printed onto a PE or nylon film substrate, and its peel resistance was tested using the 3M tape peel test method. This 3M tape peel test method references parts of the national standard GB / T 2792-2014 and is a commonly used test method in the industry. Specific procedures: 3M 600 special tape was applied to three areas of the printing area (character area, identification area, and code area), ensuring that the applied area covered as much of the screen-printed content as possible. The tape should be free of air bubbles, wrinkles, and tilting. Then, a 2KG roller was used to roll the tape back and forth 30 times at a uniform speed (300mm / min) in each of the three areas. Then, one end of the tape was lifted and quickly pulled up at a 90° angle to the test surface. This test was repeated 5 times, using a new 3M tape each time, and the test was performed at the same location each time.

[0103] After testing, 3M tapes are graded according to the GB / T9286-88 standard, and are divided into 6 levels (0 to 5), with level 0 being the best and level 5 being the worst.

[0104] Table 5: Performance Evaluation Results

[0105]

[0106] Table 6: Performance Test Results

[0107]

[0108]

[0109] in conclusion:

[0110] (1) Compared with other solvents, the solvents (ethanol, n-propanol and dimethyl acetate) provided by the present invention are beneficial to improving the opening performance and adhesion of the obtained thermal foaming anti-counterfeiting inkjet ink.

[0111] (2) Compared with other humectants, the humectant (ethylene glycol) provided by the present invention is beneficial to improving the opening performance and adhesion of the obtained thermal foaming anti-counterfeiting inkjet ink.

[0112] (3) Compared with other resins, the resin provided by the present invention (such as modified rosin resin AQ01) is beneficial to improving the printing performance, continuous printing performance, cap opening performance, aging resistance and adhesion of the obtained thermal foaming anti-counterfeiting inkjet ink.

[0113] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat-foamed anti-counterfeiting inkjet ink, characterized by, The fluorescent dye, solvent, humectant, resin and auxiliary agent; the solvent is ethanol, n-propanol and dimethyl acetate, the humectant is ethylene glycol, the resin is modified rosin resin AQ01; the auxiliary agent includes a surfactant; the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is (30.00~60.00):(5.00~30.00):(10.00~40.00); The content of the fluorescent dye is 0.10 wt%-1.00 wt%, the content of the humectant is 1.00 wt%-5.00 wt%, the content of the resin is 3.00 wt%-15.00 wt%, the content of the auxiliary agent is 0.05 wt%-0.20 wt%, and the content of the solvent is 78.80 wt%-95.85 wt%, calculated from the total mass of the hot foaming anti-counterfeiting inkjet ink.

2. The hot foaming anti-counterfeiting inkjet ink according to claim 1, wherein the fluorescent dye comprises an organic fluorescent dye; and / or The fluorescent dye comprises at least one of DF-blue, DF-red, DF-yellow and DF-green; and / or The surfactant comprises at least one of Dow Corning DC27, Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410 and TEGO 435.

3. The hot foaming anti-counterfeiting inkjet ink according to claim 1, wherein the content of the resin is 5.00 wt%-15.00 wt%, calculated from the total mass of the hot foaming anti-counterfeiting inkjet ink; and / or The content of the auxiliary agent is 0.10 wt%-0.20 wt%, calculated from the total mass of the hot foaming anti-counterfeiting inkjet ink; and / or The content of the solvent is 78.80 wt%-93.70 wt%, calculated from the total mass of the hot foaming anti-counterfeiting inkjet ink.

4. The hot foaming anti-counterfeiting inkjet ink according to claim 1, wherein the content of the fluorescent dye is 0.10 wt%-1.00 wt%, the content of the humectant is 1.00 wt%-5.00 wt%, the content of the resin is 3.00 wt%-15.00 wt%, and the content of the auxiliary agent is 0.05 wt%-0.20 wt%, calculated from the total mass of the hot foaming anti-counterfeiting inkjet ink, and the balance is the solvent.

5. The hot foaming anti-counterfeiting inkjet ink according to claim 1, wherein the content of the fluorescent dye is 0.10 wt%-1.00 wt%, the content of the humectant is 1.00 wt%-5.00 wt%, the content of the resin is 5.00 wt%-15.00 wt%, and the content of the auxiliary agent is 0.10 wt%-0.20 wt%, calculated from the total mass of the hot foaming anti-counterfeiting inkjet ink, and the balance is the solvent. 6.The thermal foaming anti-counterfeiting inkjet ink according to any one of claims 2-5, wherein a mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is (33.80-48.70) : (15.00-30.00) : (15.00-30.00). 7.The thermal foaming anti-counterfeiting inkjet ink according to claim 6, wherein a mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is 42.40:20.00:25.00 or 48.70:15.00:30.00 or 33.80:30.00:15.

00. 8.The thermal foaming anti-counterfeiting inkjet ink according to claim 1, wherein the additive comprises at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410 and TEGO 435; a content of the fluorescent dye is 0.10wt%-1.00wt% based on a total mass of the thermal foaming anti-counterfeiting inkjet ink; a content of the humectant is 1.00wt%-5.00wt%; a content of the resin is 3.00wt%-15.00wt%; a content of the additive is 0.05wt%-0.20wt%; and a remainder is the solvent. 9.The thermal foaming anti-counterfeiting inkjet ink according to claim 8, wherein a mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is (33.80-48.70) : (15.00-30.00) : (15.00-30.00). 10.The thermal foaming anti-counterfeiting inkjet ink according to claim 1, wherein the surfactant comprises at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410 and TEGO 435; a content of the fluorescent dye is 0.10wt%-1.00wt% based on a total mass of the thermal foaming anti-counterfeiting inkjet ink; a content of the humectant is 1.00wt%-5.00wt%; a content of the resin is 5.00wt%-15.00wt%; a content of the additive is 0.10wt%-0.20wt%; and a remainder is the solvent; and a mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is (40.00-45.00) : (15.00-25.00) : (20.00-30.00). 11.The thermal foaming anti-counterfeiting inkjet ink according to claim 1, wherein a mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is 42.40:20.00:25.

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12. The thermal foaming anti-counterfeiting inkjet ink according to claim 1, wherein the auxiliary agent is at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, TEGO 435; the content of the fluorescent dye is 0.50 wt%, the content of the humectant is 2.00 wt%, the content of the resin is 10.00 wt%, the content of the auxiliary agent is 0.10 wt%, and the balance is the solvent; the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is 42.40:20.00:25.00; or the auxiliary agent is at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, TEGO 435; the content of the fluorescent dye is 0.10 wt%, the content of the humectant is 1.00 wt%, the content of the resin is 5.00 wt%, the content of the auxiliary agent is 0.20 wt%, and the balance is the solvent; the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is 48.70:15.00:30.00; or the auxiliary agent is at least one of Dow Corning DC57, Dow Corning DC29, Dow Corning DC204SL, BYK 3500, BYK 3510, BYK 3520, TEGO 410, TEGO 435; the content of the fluorescent dye is 1.00 wt%, the content of the humectant is 5.00 wt%, the content of the resin is 15.00 wt%, the content of the auxiliary agent is 0.20 wt%, and the balance is the solvent; the mass ratio of ethanol, n-propanol and dimethyl acetate in the solvent is 33.80:30.00:15.

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13. A method of preparing the heat-foamed security inkjet ink according to any one of claims 1 to 12, characterized in that, Comprising: mixing the fluorescent dye, the solvent, the humectant, the resin and the auxiliary agent, stirring until the fluorescent dye is completely dissolved, filtering to obtain the thermal foaming anti-counterfeiting inkjet ink.

14. The preparation method according to claim 13, wherein the filtering is filtering through a filter paper with a pore size of 0.45-5 microns.

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