Photonic crystal ink and printing method thereof

Abstract

The present invention discloses a photonic crystal ink and a printing method thereof, wherein the raw materials of the photonic crystal ink include the following components by mass: 30 to 50 parts of prepolymer; 20 to 60 parts of active diluent monomer; 5 to 12 parts of photoinitiator; and 20 to 40 parts of nano-microspheres; wherein the diameter of the nano-microspheres is 10 nanometers to 500 nanometers, and the nano-microspheres can resonate under the excitation of electromagnetic waves. After printing, the above-mentioned photonic crystal ink has the nano-microspheres randomly dispersed in the ink system. When the photonic crystal ink is excited by electromagnetic waves, the nano-microspheres can resonate and reorganize under the action of electromagnetic waves, realizing the transition from disordered arrangement to ordered arrangement. Therefore, the photonic crystal ink can present a special gloss effect of structural color without heating and pressure. In addition, the above-mentioned photonic crystal ink does not contain organic solvents and is environmentally friendly and pollution-free. The printing method of the photonic crystal ink is used to print the above-mentioned photonic crystal ink.

Description

Technical Field

[0001] The present invention relates to the technical field of inks, and in particular to a photonic crystal ink and a printing method thereof. Background Art

[0002] The invention patent with application number 201910391586.1 discloses a photonic crystal ink and a printing method thereof. The photonic crystal ink includes a hot-melt resin and nano-microspheres. After the photonic crystal ink is printed and dried, the ink layer is heated and pressurized by hot stamping. Heating can make the hot-melt resin glassy, ​​and pressure can cause the nano-microspheres to reorganize and change from disordered arrangement to ordered arrangement, so that the photonic crystal ink produces structural color luster. However, there is a problem with this technical solution: during the hot stamping process of the photonic crystal ink, the hot stamping pressure is not easy to control. If the pressure is too light, the nano-microspheres will be arranged in a low degree of order, and the structural color luster will not be obvious; if the pressure is too high, the nano-microspheres will be easily destroyed, which will also cause the process to lose the structural color luster.

[0003] In view of this, it is necessary to provide a photonic crystal ink that can present gloss without pressure. Summary of the invention

[0004] The present invention provides a photonic crystal ink for solving the above problems.

[0005] In addition, the invention also provides a printing method of photonic crystal ink.

[0006] A photonic crystal ink, measured by mass, the raw materials for preparing the photonic crystal ink include the following components:

[0007] 30 to 50 parts of prepolymer;

[0008] Active diluent monomer 20~60 parts;

[0009] 5 to 12 parts of photoinitiator; and

[0010] 20 to 40 parts of nano-microspheres;

[0011] The diameter of the nano-microspheres is 10 nanometers to 500 nanometers, and the nano-microspheres can resonate under the excitation of electromagnetic waves.

[0012] In one embodiment, the prepolymer is selected from at least one of epoxy acrylate, polyurethane acrylate, polyester acrylate, polyether acrylate, polyacrylic acid lactone and unsaturated polyester resin.

[0013] In one embodiment, the reactive diluent monomer is a mixture of a monofunctional reactive diluent monomer and a multifunctional reactive diluent monomer.

[0014] In one embodiment, the monofunctional active diluent monomer is selected from at least one of lauryl acrylate, butyl acrylate, isodecyl acrylate, isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, caprolactone acrylate, 2-phenoxyethyl acrylate, and isobornyl acrylate.

[0015] In one embodiment, the photoinitiator is a free radical type photoinitiator.

[0016] In one embodiment, the nano-microspheres are selected from at least one of polystyrene microspheres, polyacrylate microspheres, polyacrylamide microspheres, silica microspheres, titanium dioxide microspheres, ferrosoferric oxide microspheres and phenolic resin microspheres.

[0017] In one embodiment, the natural frequency error between the nano-microsphere particles is less than or equal to 15%.

[0018] In one embodiment, 1 to 3 parts of a leveling agent are also included.

[0019] In one embodiment, 0.5 to 1.5 parts of a defoaming agent are also included.

[0020] After printing, the above-mentioned photonic crystal ink has nano-microspheres randomly dispersed in the ink system, showing the color of the nano-microspheres themselves. When the photonic crystal ink is excited by electromagnetic waves, the nano-microspheres can resonate under the action of electromagnetic waves. During the resonance, the nano-microspheres are reorganized and transformed from disordered arrangement to ordered arrangement. Therefore, the photonic crystal ink can present the special gloss effect of structural color without heating and pressure. In addition, the above-mentioned photonic crystal ink does not contain organic solvents and is environmentally friendly and pollution-free.

[0021] A method for printing photonic crystal ink comprises the following steps:

[0022] Printing photonic crystal ink onto a substrate to form an ink layer, wherein the photonic crystal ink is any one of the photonic crystal inks described above, and the photonic crystal ink comprises nano-microspheres;

[0023] Exciting the ink layer with electromagnetic waves, wherein the electromagnetic waves are used to cause the nano-microspheres to resonate;

[0024] The ink layer is UV cured.

[0025] In the printing method of the above-mentioned photonic crystal ink, before the photonic crystal ink is solidified, the ink layer is excited by electromagnetic waves to make the nano-microspheres resonate. During the resonance, the nano-microspheres are reorganized and transformed from disordered arrangement to ordered arrangement. Therefore, the photonic crystal ink can present the special gloss effect of structural color without heating and pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a flowchart of a method for printing photonic crystal ink according to one embodiment. Implementation

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" or "communicated" with another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "upper", "lower", "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0029] The photonic crystal ink is further described in detail below mainly in conjunction with the accompanying drawings and specific embodiments.

[0030] The photonic crystal ink of one embodiment includes the following components in parts by mass: 30 to 50 parts of prepolymer, 20 to 60 parts of active diluent monomer, 5 to 12 parts of photoinitiator and 20 to 40 parts of nanospheres.

[0031] The prepolymer, with a mass fraction of 30 to 50 parts, plays a film-forming role in the photonic crystal ink system. The performance of the prepolymer plays a decisive role in the hardness, friction resistance, adhesion, light resistance, chemical resistance and water resistance of the photonic crystal ink after curing. From the molecular structure of the prepolymer, the prepolymer is a low-molecular resin containing "C=C" unsaturated double bonds. Under the action of unsaturated double bond free radicals or cations, polymerization reaction can occur to form a cross-linked network structure, thereby curing the photonic crystal ink into a film.

[0032] Optionally, the unsaturated double bonds include, but are not limited to, acrylate, methacrylate, vinyl and allyl.

[0033] Preferably, the unsaturated double bond is an acrylic acid group, which has a faster light curing speed under the same light conditions.

[0034] Optionally, the prepolymer used to prepare the photonic crystal ink includes, but is not limited to, at least one of epoxy acrylate resin, polyurethane acrylate resin, polyester acrylate resin, polyether acrylate resin, polypropyl acrylate and unsaturated polyester resin.

[0035] The reactive diluent monomer has a mass fraction of 20 to 60 parts. The reactive diluent monomer plays two roles in the photonic crystal ink system: on the one hand, it regulates the viscosity of the photonic crystal ink, determines the curing rate of the photonic crystal ink, accelerates the complete curing of the prepolymer and improves the performance of the photonic crystal ink; on the other hand, the reactive diluent monomers can also undergo polymerization and curing, thereby becoming a part of the photonic crystal ink film layer.

[0036] Specifically, the molecular structure of the active diluent monomer also contains "C=C" unsaturated double bonds, which can undergo polymerization reaction under the action of free radicals or cations to form a cross-linked network structure, thereby solidifying the photonic crystal ink into a film.

[0037] Optionally, the unsaturated double bonds include, but are not limited to, acrylate, methacrylate, vinyl and allyl.

[0038] Preferably, the unsaturated double bond is an acrylic acid group, which has a faster light curing speed under the same light conditions.

[0039] Furthermore, the reactive diluent monomer can be divided into two categories, namely, a single-functional reactive diluent monomer and a multi-functional reactive diluent monomer, according to the number of acryl functional groups. A multi-functional reactive diluent monomer has at least two acryl functional groups. It is worth noting that the number of acryl functional groups is positively correlated with the rate of the photonic crystal ink and negatively correlated with the dilution effect, that is, the more acryl functional groups there are, the faster the curing speed of the photonic crystal ink is, but the worse the dilution effect is; conversely, the fewer acryl functional groups there are, the slower the curing speed of the photonic crystal ink is, but the better the dilution effect is.

[0040] Furthermore, the active diluent monomers include monofunctional active diluent monomers, which have a good dilution effect on the photonic crystal ink, so that after the photonic crystal ink is printed, it has lower liquid resistance when receiving electromagnetic wave excitation, so that the nano-microspheres can complete the arrangement and reorganization through resonance in a shorter time, which is beneficial to improve the efficiency of electromagnetic wave excitation and reduce energy consumption.

[0041] Furthermore, the active diluent monomer is a mixture of a monofunctional active diluent monomer and a multifunctional active diluent monomer, wherein the mass proportion of the monofunctional active diluent monomer is 10 to 40 parts, and the remainder is the multifunctional active diluent monomer. By limiting the amount of the monofunctional active diluent monomer, the viscosity of the photonic crystal ink can be controlled within a relatively ideal range, thereby preventing the photonic crystal ink from sputtering during the electromagnetic wave excitation process and causing quality accidents.

[0042] Optionally, the monofunctional reactive diluent monomers include, but are not limited to, lauryl acrylate, butyl acrylate, isodecyl acrylate, isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, caprolactone acrylate, 2-phenoxyethyl acrylate and isobornyl acrylate.

[0043] Optionally, the multifunctional active diluent monomer includes, but is not limited to: 1,6-hexanediol diacrylate (HDDA), dipropylene glycol diacrylate (DPGDA), tripropylene glycol diacrylate (TPGDA), and the like.

[0044] Photoinitiator, the mass fraction is 5 to 12 parts, the photoinitiator can absorb energy of a certain wavelength in the ultraviolet region (250 ~ 420nm) or visible region (400 ~ 800nm), generate free radicals, cations, etc., thereby initiating the polymerization, crosslinking and curing of prepolymers and active diluent monomers in the ink. As a key component of UV ink, the photoinitiator plays a decisive role in the light curing speed.

[0045] Specifically, the photoinitiator is a free radical photoinitiator, which can be divided into a cleavage photoinitiator and a hydrogen abstraction photoinitiator due to different mechanisms of generating free radicals. From the perspective of chemical structure, most photoinitiators are organic compounds with benzoyl groups, and the common ones are benzophenones, thioxanthones, dibenzoyl derivatives, α-carboxy ketones, α-amino ketones, benzoin derivatives, etc.

[0046] Optionally, the photoinitiator includes, but is not limited to, BASF Darocur-1173 photoinitiator, BASF Irgacure 184 photoinitiator, and BASF Irgacure 2959 photoinitiator.

[0047] Nanospheres are dispersed in the photonic crystal ink system. When the nanospheres are in a disordered arrangement in the ink, the photonic crystal ink shows the color of the nanospheres themselves; when the nanospheres are in an orderly arrangement in the ink, the orderly arranged nanospheres can produce a series of refraction and interference phenomena to the incident light, making the photonic crystal ink show the special gloss effect of structural color.

[0048] Specifically, the mass fraction of the nanospheres is 20 to 40 parts, and the diameter of the nanospheres is 10 nanometers to 500 nanometers. By limiting the particle size of the nanospheres, on the one hand, the photonic crystal ink meets the printability requirements of offset printing, flexographic printing, gravure printing and silk-screen printing; on the other hand, the diameter of the nanospheres is made smaller than the maximum visible light wavelength, so that the visible light reflected between different nanospheres can interfere or diffract.

[0049] Optionally, the nano-microspheres are selected from at least one of polystyrene microspheres, polyacrylate microspheres, polyacrylamide microspheres, silica microspheres, titanium dioxide microspheres, ferrosoferric oxide microspheres and phenolic resin microspheres.

[0050] Preferably, the inherent frequency error between the nano-microsphere particles is less than or equal to 15%. By limiting the inherent frequency error of the nano-microsphere particles, all the nano-microspheres can resonate when excited by electromagnetic waves, thereby causing arrangement and reorganization.

[0051] Preferably, the inherent frequency error between nanosphere particles is less than or equal to 5%. Since the nanospheres are in a photonic crystal ink system, when they are stimulated by electromagnetic waves to produce resonance, the amplitude of the nanospheres is greatly reduced due to the effect of liquid resistance. By further limiting the inherent frequency error of the nanospheres, the vibration of the nanospheres is sufficient to cause the nanospheres to be rearranged.

[0052] Preferably, the particle size of the nano-microspheres is 50 nanometers to 200 nanometers. The nano-microsphere material within this range has low cost, which helps to reduce the cost of the photonic crystal ink.

[0053] In another embodiment, the photonic crystal ink further includes 1 to 3 parts of a leveling agent, which can enable the photonic crystal ink to level quickly after printing to form a smooth surface.

[0054] Optionally, materials that can be used to prepare the photonic crystal ink leveling agent include, but are not limited to: TEGO450 leveling agent from German company Digo provided by Dongguan Aokai High-tech Materials Co., Ltd., Dow Corning DC57 leveling agent provided by Guangzhou Soman Trading Co., Ltd., and UV leveling agent A-1033 provided by Guangzhou Soman Trading Co., Ltd.

[0055] In another embodiment, the photonic crystal ink further includes 0.5 to 1.5 parts of a defoaming agent, and the defoaming agent is used to eliminate bubbles in the photonic crystal ink.

[0056] Optionally, materials that can be used to prepare photonic crystal ink defoamers include, but are not limited to: DT1500 defoamer provided by Zhengzhou Junlei Chemical Products Co., Ltd., Lencolo 2108 defoamer provided by Guangdong Sanqi New Materials Co., Ltd., and DU-069 defoamer provided by Dongguan Guozhong New Materials Research Institute Co., Ltd.

[0057] After printing, the above-mentioned photonic crystal ink has nano-microspheres randomly dispersed in the ink system, showing the color of the nano-microspheres themselves. When the photonic crystal ink is excited by electromagnetic waves, the nano-microspheres can resonate under the action of electromagnetic waves. During the resonance, the nano-microspheres are reorganized and transformed from disordered arrangement to ordered arrangement. Therefore, the photonic crystal ink can present the special gloss effect of structural color without heating and pressure. In addition, the above-mentioned photonic crystal ink does not contain organic solvents and is environmentally friendly and pollution-free.

[0058] A method for printing photonic crystal ink comprises the following steps:

[0059] Step S10: Printing the photonic crystal ink onto the substrate to form an ink layer.

[0060] Specifically, the photonic crystal ink is printed on the substrate by using a printing device, wherein the photonic crystal ink is any one of the photonic crystal inks mentioned above, and the printing method can be offset printing, flexographic printing, gravure printing or silk screen printing.

[0061] Step S20: Exciting the ink layer with electromagnetic waves, wherein the electromagnetic waves are used to cause the nano-microspheres to resonate.

[0062] Specifically, electromagnetic waves are used to excite the ink layer, and the frequency of the electromagnetic waves is close to or equal to the natural frequency of the nanospheres, so that the nanospheres can resonate in the electromagnetic wave environment. The nanospheres are reorganized during the resonance process, so that the nanospheres change from no arrangement to an orderly arrangement, thereby refracting and interfering the incident light, and then producing a special structural color gloss.

[0063] Furthermore, the error between the frequency of the electromagnetic wave and the inherent frequency of the nanospheres is less than or equal to 15%. By limiting the frequency error of the electromagnetic wave, the error between the frequency of the electromagnetic wave and the frequency of the individual nanospheres is controlled within 30%, so that all the individual nanospheres can overcome the liquid resistance and resonate under the excitation of the electromagnetic wave.

[0064] Furthermore, the error between the frequency of the electromagnetic wave and the inherent frequency of the nanospheres is less than or equal to 5%. By further limiting the frequency error of the electromagnetic wave, the error between the frequency of the electromagnetic wave and the frequency of the individual nanospheres is controlled within 20%, so that all the individual nanospheres can quickly overcome the liquid resistance and resonate under the excitation of the electromagnetic wave, thereby improving the efficiency of the electromagnetic excitation.

[0065] Preferably, the electromagnetic wave is a variable frequency electromagnetic wave. During the electromagnetic wave excitation process, the frequency of the electromagnetic wave changes from near to far relative to the natural frequency of the nanospheres, causing the amplitude of the nanospheres to change from large to small until the resonance finally stops. This change helps the nanospheres to be arranged and reorganized in a more orderly manner, thereby producing a more obvious structural color and special luster. It should be understood that the change of the electromagnetic wave frequency from near to far relative to the natural frequency of the nanospheres can be a change from large to small with the natural frequency of the nanospheres as the center, or a change from small to large.

[0066] Optionally, the electromagnetic wave is ultrasonic wave or infrasonic wave.

[0067] Step S30: UV curing the ink layer.

[0068] The prepolymer and active diluent monomer in the photonic crystal ink are cross-linked and cured by irradiating with UV light source, thereby fixing the ink layer.

[0069] In some embodiments, before UV curing the ink layer, the ink layer is allowed to stand for a predetermined time so that the nano-microspheres are in a mechanically stable state through sedimentation, which is beneficial to further enhance the special photonic effect of the photonic crystal presenting structural color.

[0070] In the printing method of the above-mentioned photonic crystal ink, before the photonic crystal ink is solidified, the ink layer is excited by electromagnetic waves to make the nano-microspheres resonate. During the resonance, the nano-microspheres are reorganized and transformed from disordered arrangement to ordered arrangement. Therefore, the photonic crystal ink can present the special gloss effect of structural color without heating and pressure.

[0071] The following are specific embodiments. Example

[0072] This embodiment provides a photonic crystal ink. The raw materials for preparing the photonic crystal ink include, by weight: 30 parts of prepolymer, 20 parts of active diluent monomer, 5 parts of photoinitiator, and 20 parts of nano-microspheres.

[0073] In this embodiment, the prepolymer is epoxy acrylate resin; the active diluent monomer is a mixture of a monofunctional active diluent monomer and a multifunctional active diluent monomer, wherein the monofunctional active diluent monomer is lauryl acrylate, the mass fraction is 10 parts, and the multifunctional active diluent monomer is 1,6-hexanediol diacrylate, the mass fraction is 10 parts; the photoinitiator is BASF Darocur-1173 photoinitiator; the nanospheres are silica nanospheres with model XWJ-SQNM80200 provided by Dongguan Xinweijin Industrial Co., Ltd., and the particle size of the nanospheres is 200 nanometers.

[0074] After printing, the above-mentioned photonic crystal ink has nano-microspheres randomly dispersed in the ink system, showing the color of the nano-microspheres themselves. When the photonic crystal ink is excited by electromagnetic waves, the nano-microspheres can resonate under the action of electromagnetic waves. During the resonance, the nano-microspheres are reorganized and transformed from disordered arrangement to ordered arrangement. Therefore, the photonic crystal ink can present the special gloss effect of structural color without heating and pressure. In addition, the above-mentioned photonic crystal ink does not contain organic solvents and is environmentally friendly and pollution-free.

[0075] In addition, this embodiment also provides a method for printing photonic crystal ink, comprising the following steps:

[0076] The first step: printing the photonic crystal ink provided in this embodiment onto a substrate to form an ink layer.

[0077] Step 2: Use electromagnetic waves to excite the ink layer, so that the nano-microspheres in the ink layer resonate and undergo a reorganization from a disordered arrangement to an ordered arrangement. In this embodiment, the electromagnetic wave is ultrasonic wave, and the error between the frequency of the electromagnetic wave and the natural frequency of the nano-microspheres is equal to 15%.

[0078] Step 3: UV curing of photonic crystal ink.

[0079] In the printing method of the above-mentioned photonic crystal ink, before the photonic crystal ink is solidified, the ink layer is excited by electromagnetic waves to make the nano-microspheres resonate. During the resonance, the nano-microspheres are reorganized and transformed from disordered arrangement to ordered arrangement. Therefore, the photonic crystal ink can present the special gloss effect of structural color without heating and pressure. Example

[0080] The photonic crystal ink provided in this embodiment is similar to the photonic crystal ink provided in Example 1, except that: (1) the prepolymer is a polyurethane acrylate resin, and its mass fraction is 40 parts; (2) the active diluent monomer is a mixture of a monofunctional active diluent monomer and a multifunctional active diluent monomer, wherein the monofunctional active diluent monomer is isooctyl acrylate, and its mass fraction is 20 parts, and the multifunctional active diluent monomer is dipropylene glycol diacrylate, and its mass fraction is 20 parts; (3) the photoinitiator is BASF Irgacure 184 photoinitiator, and its mass fraction is 8 parts; (4) the nano-microspheres are nano-microspheres of model Metasil ML-100 provided by Guangzhou Meigu Chemical Co., Ltd., and their particle size is 80 nanometers; (5) it also includes 1 part of TEGO450 leveling agent provided by Dongguan Aokai High-tech Materials Co., Ltd.

[0081] In addition, this embodiment also provides a method for printing photonic crystal ink, comprising the following steps:

[0082] The first step: printing the photonic crystal ink provided in this embodiment onto a substrate to form an ink layer.

[0083] Step 2: Use electromagnetic waves to excite the ink layer, so that the nano-microspheres in the ink layer resonate and undergo a reorganization from a disordered arrangement to an ordered arrangement. In the electromagnetic wave excitation process of this embodiment, the frequency of the electromagnetic wave changes from near to far relative to the natural frequency of the nano-microspheres, causing the amplitude of the nano-microspheres to change from large to small until the resonance finally stops.

[0084] Step 3: UV curing of photonic crystal ink.

[0085] The printing method of the photonic crystal ink is helpful to arrange and reorganize the nano-microspheres in a more orderly manner, thereby producing a more obvious structural color and special luster. Example

[0086] The photonic crystal ink provided in this embodiment is similar to the photonic crystal ink provided in Example 2, except that: (1) the prepolymer is polypropyl acrylate, and its mass fraction is 50 parts; (2) the active diluent monomer is a mixture of a monofunctional active diluent monomer and a multifunctional active diluent monomer, wherein the monofunctional active diluent monomer is isobornyl acrylate, and its mass fraction is 40 parts, and the multifunctional active diluent monomer is tripropylene glycol diacrylate, and its mass fraction is 20 parts; (3) the photoinitiator is BASF Irgacure 2959 photoinitiator, and its mass fraction is 12 parts; (4) the nano-microspheres are amino polystyrene microspheres provided by Beijing Zhongke Keyou Technology Co., Ltd., and its particle size is 20 nanometers; (5) the leveling agent is provided by Guangzhou Soman Trading Co., Ltd., and its model is Dow Corning DC57, and its mass fraction is 3 parts; (6) it also includes 1 part of Lencolo 2108 defoamer provided by Guangdong Sanqi New Materials Co., Ltd.

[0087] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for printing photonic crystal ink, characterized in that: The steps include: Printing the photonic crystal ink onto a substrate to form an ink layer, wherein the raw materials for preparing the photonic crystal ink include, by weight, 30 to 50 parts of a prepolymer, 20 to 60 parts of an active diluent monomer, 5 to 12 parts of a photoinitiator, and 20 to 40 parts of nano-microspheres, wherein the diameter of the nano-microspheres is 10 nanometers to 500 nanometers; The ink layer is excited by electromagnetic waves, wherein the electromagnetic waves are variable-frequency electromagnetic waves. During the electromagnetic wave excitation process, the frequency of the electromagnetic waves changes from near to far relative to the natural frequency of the nano-microspheres, so that the amplitude of the nano-microspheres changes from large to small until the resonance finally stops; The ink layer is UV cured.

2. The method for printing photonic crystal ink according to claim 1, characterized in that: The prepolymer is selected from at least one of epoxy acrylate, polyurethane acrylate, polyester acrylate, polyether acrylate and unsaturated polyester resin.

3. The method for printing photonic crystal ink according to claim 2, characterized in that: The active diluent monomer is a mixture of a monofunctional active diluent monomer and a multifunctional active diluent monomer.

4. The method for printing photonic crystal ink according to claim 3, characterized in that: The monofunctional active diluent monomer is selected from at least one of lauryl acrylate, butyl acrylate, isodecyl acrylate, isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, caprolactone acrylate, 2-phenoxyethyl acrylate and isobornyl acrylate.

5. The method for printing photonic crystal ink according to claim 4, characterized in that: The photoinitiator is a free radical photoinitiator.

6. The method for printing photonic crystal ink according to claim 5, characterized in that: The nanometer microspheres are selected from at least one of polystyrene microspheres, polyacrylate microspheres, polyacrylamide microspheres, silicon dioxide microspheres, titanium dioxide microspheres, ferroferric oxide microspheres and phenolic resin microspheres.

7. The method for printing photonic crystal ink according to claim 6, characterized in that: The inherent frequency error between the nano-microsphere particles is less than or equal to 15%.

8. The method for printing photonic crystal ink according to claim 7, characterized in that: The photonic crystal ink also includes 1 to 3 parts of a leveling agent.

9. The method for printing photonic crystal ink according to claim 8, characterized in that: The photonic crystal ink further comprises 0.5 to 1.5 parts of a defoaming agent.

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