Digital printing material capable of emitting light under external pressure and preparation method thereof

Abstract

The invention discloses a digital printing material capable of emitting light under external pressure and a preparation method thereof, and relates to the field of digital printing materials. Comprising a protective layer which is a transparent PET or PE film or a transparent UV curing coating; the stress luminescent layer is composed of a UV curing resin matrix, a stress luminescent material, a nano reinforcing agent, a photoinitiator, a silane coupling agent and a TMPTA monomer; the adhesive force promoting layer is acrylic acid type glue; the PET substrate layer is a PET film, and the stress luminescent layer comprises the following components in parts by mass: 60-80 parts of a UV curing resin matrix, 10-30 parts of a stress luminescent material, 5-10 parts of a nano reinforcing agent, 2-5 parts of a photoinitiator, 0.5-1.5 parts of a silane coupling agent and 3-8 parts of a TMPTA monomer. The invention has the advantages of low luminescence delay, low luminous decay, high temperature and high humidity resistance and low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of digital printing materials, in particular to a digital printing material emitting light under external pressure and a preparation method thereof. BACKGROUND

[0002] As the core carrier of modern printing technology, digital printing materials realize high-precision pattern transfer through digital imaging systems. The substrate of the material is usually composed of polymer film (such as PET, BOPP), paper or composite material, and the surface is treated by a functional coating to adapt to inkjet, electrophotographic or nano printing processes. The material system is widely used in anti-counterfeiting packaging fields. For example, wine anti-counterfeiting labels realize primary anti-counterfeiting through the combination of microtext and holographic layers, electronic product warranty stickers prevent repeated pasting by using a fragile paper substrate, and file seals provide visual verification by using temperature-changing ink.

[0003] However, the existing technology has significant limitations:

[0004] Static anti-counterfeiting elements (such as two-dimensional codes and laser holograms) are easily copied by high-precision scanning; photoluminescent materials rely on external light sources for excitation and have high response delay and high light intensity decay rate;

[0005] Insufficient adhesion strength of pressure-sensitive adhesive leads to complete peeling and repeated use of labels, making it difficult to meet the instant interaction needs of high-security anti-counterfeiting scenarios.

[0006] These defects restrict the deep application of digital printing materials in high-end drug anti-counterfeiting, luxury product traceability code and other fields, and there is an urgent need to develop new intelligent materials with rapid pressure response, strong environmental tolerance and non-peeling properties.

[0007] Therefore, the present application provides a digital printing material emitting light under external pressure and a preparation method thereof. SUMMARY

[0008] The present application aims to solve the problems in the prior art and provides a digital printing material emitting light under external pressure and a preparation method thereof.

[0009] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0010] A digital printing material emitting light under external pressure, comprising:

[0011] a protective layer, which is a transparent PET or PE film or a transparent UV cured coating;

[0012] a stress luminescent layer composed of a UV cured resin matrix, a stress luminescent material, a nano reinforcing agent, a photoinitiator, a silane coupling agent and a TMPTA monomer;

[0013] A stress-resistant promoting layer, which is an acrylic glue;

[0014] A PET substrate layer, which is a PET film.

[0015] Preferably, the thickness of the protective layer is 5-10 μm; the thickness of the stress-resistant promoting layer is 15-25 μm; and the thickness of the PET substrate layer is 50-100 μm.

[0016] Preferably, in the stress luminescent layer, the mass ratio of each component is:

[0017] UV curing resin matrix 60-80 parts,

[0018] Stress luminescent material 10-30 parts,

[0019] Nano-enhancing agent 5-10 parts,

[0020] Photoinitiator 2-5 parts

[0021] Silane coupling agent 0.5-1.5 parts,

[0022] TMPTA monomer 3-8 parts.

[0023] Preferably, the UV curing resin matrix is polyurethane acrylate PUA or epoxy acrylate EA;

[0024] The stress luminescent material is SrAl2O4:Eu 2+ or ZnS:Cu;

[0025] The nano-enhancing agent is nano-SiO2 or micron glass powder;

[0026] The photoinitiator is TPO or 184;

[0027] The TMPTA monomer is trimethylolpropane triacrylate.

[0028] Preferably, the acrylic glue in the stress-resistant promoting layer contains 10%-20% SiO2 micro powder.

[0029] A preparation method of a digital printing material that emits light under external pressure, comprising the following steps:

[0030] S1: material pretreatment, the stress luminescent material is placed in a planetary ball mill, 1-3% silane coupling agent KH-550 ethanol solution is added, and after ball milling, it is dried for standby, then the nano-enhancing agent is dehydrated in an oven;

[0031] S2: slurry mixing, UV curing resin matrix, photoinitiator, TMPTA monomer were added into high-speed planetary mixer in proportion, and then stress luminescent material and nano-enhancing agent were added in batches, and the stirring speed was increased;

[0032] S3: coating and staged curing, the slurry was coated on the PET substrate by a slot coater, the wet film thickness was controlled to be 15±2 μm, and then two-stage curing treatment was performed;

[0033] S4: compounding and die cutting, a force-resistant promoting layer was coated on the surface of the cured layer, and then the protective film was attached by a hot roller compounding machine, and then a round knife die cutting machine was used to cut into a customized shape.

[0034] Preferably, in the S1 step, the ball milling speed is 300-500 rpm, the ball milling time is 1-2, the drying temperature of the stress luminescent material is 70-90°C, and the dehydration temperature of the nano-enhancing agent is 110-130°C, and the time is 3-5 hours.

[0035] Preferably, in the S2 step, the premixing speed is 400-600 rpm, the premixing time is 5-15 minutes, the stirring speed after adding the stress luminescent material and the nano-enhancing agent is 800-1200 rpm, and the stirring time is 40-80 minutes.

[0036] Preferably, in the S3 step, the two-stage curing is respectively:

[0037] Pre-curing: UV intensity 50-100 mW / cm 2 , time 1-3 seconds;

[0038] Main curing: UV intensity 200-300 mW / cm 2 , time 2-4 seconds.

[0039] Preferably, in the S4 step, the roller temperature of the hot roller compounding is 60-100°C, and the pressure is 0.4-0.6 MPa.

[0040] The beneficial effects of the present application are:

[0041] Pressure triggered instant light-emitting, light-emitting intensity ≥50 cd / m 2 ;

[0042] High temperature and high humidity resistance (luminescence attenuation <10% at 60°C / 85% RH);

[0043] Low cost per unit, suitable for large-scale production. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A digital printing material hierarchical structure for emitting light under external pressure is provided. DETAILED DESCRIPTION

[0045] The technical solutions of the present application will be further described in detail in combination with the specific embodiments.

[0046] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking", "arrangement" should be understood in a broad sense, for example, it can be fixedly connected, arranged, or detachably connected, arranged, or integrally connected, arranged. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0047] Embodiment 1:

[0048] A digital printing material emitting light under external pressure, comprising:

[0049] A protective layer, which is a transparent PET or PE film or a transparent UV cured coating;

[0050] A stress luminescent layer, which is composed of a UV cured resin matrix, a stress luminescent material, a nano reinforcing agent, a photoinitiator, a silane coupling agent and a TMPTA monomer;

[0051] A force-resistant promoting layer, which is an acrylic glue;

[0052] A PET substrate layer, which is a PET film.

[0053] The thickness of the protective layer is 5-10 μm; the thickness of the force-resistant promoting layer is 15-25 μm; the thickness of the PET substrate layer is 50-100 μm.

[0054] In the stress luminescent layer, the mass ratio of each component is:

[0055] The UV cured resin matrix is 60-80 parts,

[0056] The stress luminescent material is 10-30 parts,

[0057] The nano reinforcing agent is 5-10 parts,

[0058] The photoinitiator is 2-5 parts

[0059] The silane coupling agent is 0.5-1.5 parts,

[0060] The TMPTA monomer is 3-8 parts.

[0061] The UV cured resin matrix is polyurethane acrylate PUA or epoxy acrylate EA, which provides flexibility and curing performance as a matrix;

[0062] The stress luminescent material is SrAl2O4:Eu 2+Alternatively, ZnS:Cu can be used to provide pressure-based luminescence.

[0063] The nano-reinforcing agent is nano-SiO2 or micron-sized glass powder, which enhances hardness, wear resistance, and adjusts the stress response sensitivity of the light-emitting layer.

[0064] The photoinitiator is TPO or 184, used for UV curing reaction;

[0065] The TMPTA monomer is trimethylolpropane triacrylate, which is used to adjust the crosslinking density and control the hardness and elasticity of the cured material.

[0066] The acrylic adhesive in the durability-enhancing layer contains 10%–20% SiO2 micro powder.

[0067] Example 2:

[0068] A method for preparing a digital printing material that emits light under external pressure, comprising the following steps:

[0069] S1: Material pretreatment: Place the stress-luminescent material in a planetary ball mill (model XQM-1L), add 1-3% silane coupling agent KH-550 ethanol solution, ball mill and dry for later use, and then dehydrate the nano-reinforcing agent in an oven.

[0070] S2: Slurry mixing: Add the UV-curable resin matrix, photoinitiator, and TMPTA monomer to a high-speed planetary mixer (model PDM-400) for premixing according to the proportion. Then add the stress luminescent material and nano-reinforcing agent in batches and continue mixing by increasing the speed.

[0071] S3: Coating and staged curing. The slurry is coated onto the PET substrate using a slot coater (model SCC-200), with the wet film thickness controlled at 15±2μm, followed by two-stage curing.

[0072] S4: Lamination and die-cutting. A layer containing a durability-promoting layer is coated on the surface of the cured layer. It is then laminated with a protective film using a hot roller laminator (model HRC-100) and cut into custom shapes using a rotary die-cutting machine (model YDM-300).

[0073] In step S1, the ball milling speed is 300-500 rpm, the ball milling time is 1-2 hours, the drying temperature of the stress luminescent material is 70-90℃, the dehydration temperature of the nano-reinforcing agent is 110-130℃, and the time is 3-5 hours.

[0074] In step S2, the premixing speed is 400-600 rpm and the premixing time is 5-15 minutes. After adding the stress-luminescent material and nano-reinforcing agent, the stirring speed is 800-1200 rpm and the stirring time is 40-80 minutes.

[0075] In the S3 step, the two-stage curing is respectively:

[0076] Pre-curing: UV intensity 50-100 mW / cm 2 , time 1-3 seconds;

[0077] Main curing: UV intensity 200-300 mW / cm 2 , time 2-4 seconds.

[0078] In the S4 step, the roller temperature of the thermal roller compounding is 60-100℃, and the pressure is 0.4-0.6 MPa.

[0079] The above merely describes the preferred specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art, according to the technical solution and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A digital printed material that emits light in response to external pressure, characterized in that, include: The protective layer is a transparent PET or PE film or a transparent UV-curable coating. The stress-luminescent layer is composed of a UV-curable resin matrix, stress-luminescent material, nano-reinforcing agent, photoinitiator, silane coupling agent and TMPTA monomer; Durability promoting layer, which is an acrylic adhesive; The PET substrate layer is a PET film.

2. The digital printed material that emits light by external pressure according to claim 1, characterized in that, The thickness of the protective layer is 5-10 μm; the thickness of the durability promoting layer is 15-25 μm; and the thickness of the PET substrate layer is 50-100 μm.

3. The digital printed material that emits light by external pressure according to claim 1, wherein, In the stress-emitting layer, the mass ratio of each component is: 60-80 parts of UV-curable resin matrix 10-30 parts of stress-luminescent material 5-10 parts of nano-reinforcing agent 2-5 parts of photoinitiator 0.5-1.5 parts of silane coupling agent 3-8 parts of TMPTA monomer.

4. The digital printing material that emits light under external pressure according to claim 1, characterized in that, The UV-curable resin matrix is ​​polyurethane acrylate (PUA) or epoxy acrylate (EA); The stress luminescence material is SrAl2O4:Eu 2+ or ZnS:Cu; The nano-reinforcing agent is nano-SiO2 or micron-sized glass powder; The photoinitiator is TPO or 184; The TMPTA monomer is trimethylolpropane triacrylate.

5. The digital printing material that emits light under external pressure according to claim 1, characterized in that, The acrylic adhesive in the durability-enhancing layer contains 10%–20% SiO2 micro powder.

6. A method for preparing a digital printing material that emits light under external pressure, used to prepare the digital printing material that emits light under external pressure as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: Material pretreatment: Place the stress-luminescent material in a planetary ball mill, add 1-3% silane coupling agent KH-550 ethanol solution, ball mill and dry for later use, and then dehydrate the nano-reinforcing agent in an oven. S2: Slurry mixing: UV curable resin matrix, photoinitiator, and TMPTA monomer are added to a high-speed planetary mixer for premixing according to the proportion. Then, stress luminescent material and nano-reinforcing agent are added in batches, and the speed is increased to continue mixing. S3: Coating and staged curing. The slurry is coated onto the PET substrate using a slot coater, with the wet film thickness controlled at 15±2μm, followed by two-stage curing. S4: Lamination and die-cutting. A layer containing a durability-promoting layer is coated on the surface of the cured layer. It is then laminated with a protective film using a hot roller laminating machine and cut into custom shapes using a rotary die-cutting machine.

7. The method for preparing a digital printing material that emits light under external pressure according to claim 6, characterized in that, In step S1, the ball milling speed is 300-500 rpm, the ball milling time is 1-2 hours, the drying temperature of the stress luminescent material is 70-90℃, the dehydration temperature of the nano-reinforcing agent is 110-130℃, and the time is 3-5 hours.

8. The method for preparing a digital printing material that emits light under external pressure according to claim 6, characterized in that, In step S2, the premixing speed is 400-600 rpm and the premixing time is 5-15 minutes. After adding the stress-luminescent material and nano-reinforcing agent, the stirring speed is 800-1200 rpm and the stirring time is 40-80 minutes.

9. The method for preparing a digital printing material that emits light under external pressure according to claim 6, characterized in that, In step S3, the two curing stages are as follows: Pre-cure: UV intensity 50 - 100 mW / cm 2 for 1 - 3 seconds; Main cure: UV intensity 200-300 mW / cm 2 for 2-4 seconds.

10. The method for preparing a digital printing material that emits light under external pressure according to claim 6, characterized in that, In step S4, the roller temperature for hot roller lamination is 60-100℃, and the pressure is 0.4-0.6MPa.

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