ink

Abstract

The application provides an ink, which comprises the following components in percentage by weight: solid material, 15-60%; UV curing resin, 25-50%; dual curing resin, 1-15%; monomer, 0-3%; composite photoinitiator, 5-12%; auxiliary agent, 1-4%; the solid material is anti-counterfeiting material, pigment and filler; the UV curing resin is a mixture of one or more than one of UV resins with absorption peaks matching the absorption spectrum of the composite photoinitiator; the dual curing resin is alicyclic epoxy acrylic resin with dual curing functional groups; the monomer is a mixture of one or more than one of trimethylolpropane triacrylate, tripropylene glycol diacrylate and ethoxypropyl ethylate; the composite photoinitiator is a mixture of one or more than one of acyl phosphine oxide, alpha-hydroxy ketone derivative, alpha-amino ketone derivative, benzoin and derivatives thereof, triaryl sulfonium salt and the like; and the auxiliary agent is a pigment wetting and dispersing auxiliary agent or a substrate wetting auxiliary agent.

Description

Technical Field

[0001] This application relates to the field of printing anti-counterfeiting technology, and specifically proposes an ink. Background Technology

[0002] In related technologies, the prepared inks are not suitable for high-speed printing, the inks have poor curing properties, and the quality of the printed numbers and embossed graphics is low. Summary of the Invention

[0003] In order to solve at least one of the above-mentioned technical problems, one objective of this application is to provide an ink.

[0004] In view of the above, an ink is provided according to one object of this application, comprising the following components by weight percentage: solid material, 15%–60%; UV-curable resin, 25%–50%; dual-curable resin, 1%–15%; monomer, 0%–3%; composite photoinitiator, 5%–12%; additives, 1%–4%; the solid material is anti-counterfeiting material, pigment, and filler; the UV-curable resin is one or a mixture of several UV resins whose absorption peak matches the absorption spectrum of the composite photoinitiator; the dual-curable resin is an alicyclic epoxy acrylate resin having dual curing functional groups; the monomer is one or a mixture of several of trimethylolpropane triacrylate, tripropylene glycol diacrylate, and ethyl ethoxypropionate; the composite photoinitiator is one or a mixture of several of acylphosphine oxide, α-hydroxy ketone derivative, α-amino ketone derivative, benzoyl and its derivatives, and triarylthionium salt; the additives are pigment wetting and dispersing aids or substrate wetting aids.

[0005] The ink proposed in this application specifically includes solid materials, UV-curable resin, dual-curable resin, monomers, composite photoinitiators, and additives. Specifically, by weight percentage, the ink comprises the following components: solid materials, 15%–60%; UV-curable resin, 25%–50%; dual-curable resin, 1%–15%; monomers, 0%–3%; composite photoinitiator, 5%–12%; and additives, 1%–4%.

[0006] This application synthesizes a dual-curing resin independently, combines it with other UV-curing resins whose absorption peaks match the absorption spectra of the composite photoinitiator in the formulation, and monomers and other components, and limits the mass number of each of the above components to obtain an ink by combining them.

[0007] This ink is suitable for high-speed printing processes of 100m / min to 150m / min. When used with UV equipment on a coding machine, the ink can be fully cured, resulting in high-quality numbers and embossed graphics.

[0008] Specifically, the solid materials include anti-counterfeiting materials, pigments, and fillers. Anti-counterfeiting materials enable the ink to be anti-counterfeited, while pigments are mainly responsible for coloring the ink and giving it specific colors and properties.

[0009] Fillers can effectively improve the printability and stability of inks, and also enhance their anti-counterfeiting properties.

[0010] UV-curable resin is one or a mixture of several UV resins whose absorption peaks match the absorption spectrum of the composite photoinitiator. UV-curable resin can cure rapidly under UV light irradiation. During UV curing, the composite photoinitiator absorbs the energy of the UV light, initiating a cross-linking reaction of the resin molecular chains to form a stable cured product.

[0011] This application sets the UV-curable resin to be one or a mixture of several UV resins whose absorption peak matches the absorption spectrum of the composite photoinitiator, thereby ensuring that the energy of the composite photoinitiator can be fully utilized during the UV curing process to achieve an effective curing reaction.

[0012] The dual-curing resin is an alicyclic epoxy acrylate resin with dual curing functional groups. This application adopts a special design for the dual-curing resin. The alicyclic epoxy acrylate resin with dual curing functional groups has two or more functional groups that can undergo cross-linking reactions. After cross-linking with other components in the ink, it forms a more stable and robust network molecular structure.

[0013] Dual-curing resins have a more stable molecular structure and are less susceptible to external environmental influences. Using this type of resin can reduce changes in inks during storage and use, thereby improving ink stability.

[0014] Dual-curing resins can improve printability. The molecular structure of dual-curing resins is flexible, which can improve the flowability and wettability of inks.

[0015] In addition, the aforementioned dual-curing resin can increase the uniqueness of the ink formulation, which is difficult to replicate and counterfeit, thereby increasing the anti-counterfeiting performance of the ink and improving the security and credibility of the product.

[0016] The monomer is one or a mixture of several of trimethylolpropane triacrylate, tripropylene glycol diacrylate, and ethyl ethoxypropionate. In inks, the monomer is an important component, primarily used to react with composite photoinitiators to form copolymers, thereby curing the ink.

[0017] The monomer can be trimethylolpropane triacrylate, which has high polarity and reactivity and can improve the performance of the polymer.

[0018] The monomer can also be tripropylene glycol diacrylate, which has lower polarity and higher glass transition temperature, thus improving the thermal stability of the polymer.

[0019] The monomer can also be ethyl ethoxypropionate, which has low polarity and good solubility, and can improve the solubility and flowability of the polymer.

[0020] Monomers can also be mixtures of the above-mentioned substances. By mixing these substances, complementary advantages can be achieved, resulting in polymers with better performance.

[0021] The composite photoinitiator is one or a mixture of several of the following: acylphosphine oxide, α-hydroxy ketone derivative, α-amino ketone derivative, benzoyl and its derivatives, triarylthioonium salt, etc.

[0022] Composite photoinitiators are composed of a mixture of various photoinitiators, each with different light absorption and photoinitiation effects. When they are mixed together, they complement each other, improving photoinitiation efficiency and curing effect.

[0023] Acylphosphine oxides possess high light absorption capacity and initiation activity, which can promote polymer chain growth. α-Hydroxyketone derivatives and α-aminoketone derivatives absorb energy, and the resulting free radicals can undergo cross-linking reactions with unsaturated double bonds in resins to form high-molecular-weight polymers. Benzoyl and its derivatives can initiate polymer chain growth and also promote resin cross-linking reactions. Triarylthionium salts possess high initiation activity and light absorption capacity, and can promote chain growth and cross-linking reactions in cationic polymerization.

[0024] The additives are pigment wetting and dispersing agents or substrate wetting agents. On the one hand, as pigment wetting and dispersing agents, they can improve the dispersibility of pigments in inks, prevent pigment agglomeration, and enhance the dispersion stability and tinting strength of pigments.

[0025] On the other hand, the additive is a substrate wetting agent. The substrate wetting agent can reduce the surface tension between the ink and the substrate, promote the wetting and spreading of the ink on the substrate surface, and improve the adhesion and uniformity of the ink layer.

[0026] In summary, pigment wetting and dispersing aids and substrate wetting aids have many benefits in inks, which can improve ink performance and printing quality, and enhance ink layer adhesion and weather resistance.

[0027] The ink in this application is suitable for letterpress or number printing. The various performance indicators of the ink after curing, such as wrinkle resistance, abrasion resistance, washability, and resistance to various physical and chemical properties, meet the standards issued by the domestic banknote printing industry.

[0028] In addition, the ink in the above-mentioned technical solution provided in this application may also have the following additional technical features:

[0029] In some technical solutions, the ink may optionally include the following components by weight percentage: solid materials, 35%–55%; UV-curable resin, 25%–40%; dual-curable resin, 5%–10%; monomers, 0%–2%; composite photoinitiator, 8%–12%; and additives, 2%–3%.

[0030] In this technical solution, the proportions of each component in the ink are further refined, setting the following proportions: solid materials, 35%–55%; UV-curable resin, 25%–40%; dual-curing resin, 5%–10%; monomers, 0%–2%; composite photoinitiator, 8%–12%; and additives, 2%–3%. Through these proportions, the ink can adapt to different printing speeds, meeting the demands of high-speed printing, and can accommodate different curing speeds and degrees, thus improving the ink's printability and stability.

[0031] In some technical solutions, alternatively, alicyclic epoxy acrylate resins with dual curing functional groups are prepared by epoxidizing dienes.

[0032] In this technical solution, the alicyclic epoxy acrylate resin with dual curing functional groups is prepared by epoxidizing a diene, thereby enhancing its heat resistance and chemical corrosion resistance. The epoxidation reaction converts the double bonds in the resin molecule into epoxy groups, which possess high heat resistance and chemical corrosion resistance. Therefore, the epoxidized alicyclic epoxy acrylate resin with dual curing functional groups exhibits better heat resistance and chemical corrosion resistance. Furthermore, the alicyclic epoxy acrylate resin with dual curing functional groups inherently has a fast curing speed. After epoxidation, the epoxy groups in the resin molecule can further increase the curing speed, improving the curing efficiency of the ink.

[0033] In some technical solutions, optionally, the UV-curable resin is a mixture of several UV resins whose absorption peaks match the absorption spectrum of the composite photoinitiator, wherein the active groups of the several UV resins whose absorption peaks match the absorption spectrum of the composite photoinitiator have different structures.

[0034] In this technical solution, the UV-curable resin is a mixture of several UV resins whose absorption peaks match the absorption spectrum of the composite photoinitiator. The active groups of these UV resins, whose absorption peaks match the absorption spectrum of the composite photoinitiator, have different structures. By selecting a UV resin whose absorption spectrum matches the composite photoinitiator, maximum light energy absorption within a specific wavelength range can be ensured, thereby improving photoinitiation efficiency and curing effect.

[0035] Using UV resins with different active group structures can provide a wider range of chemical reaction possibilities, which helps to optimize the crosslinking reaction during the curing process and improve the performance of the cured structure.

[0036] In some technical solutions, alternatively, the alicyclic epoxy acrylate resin with dual curing functional groups is synthesized into active groups through an unsaturated matrix and peracid.

[0037] In this technical solution, the active groups of the alicyclic epoxy acrylate resin with dual curing functional groups synthesized by the reaction of unsaturated matrix and peracid can enhance crosslinking density, improve weather resistance and enhance adhesion.

[0038] This application utilizes a self-synthesized dual-curing resin, combined with other UV-curing resins whose absorption peaks match the absorption spectra of the composite photoinitiator in the formulation, and monomers, etc., to limit the mass fraction of each component, thereby producing a UV-curable embossed and serial number anti-counterfeiting ink. This ink is suitable for high-speed printing processes of 100m / min to 150m / min. When used with the UV equipment of a serial number printer, the ink can be fully cured, resulting in high-quality serial numbers and embossed graphics.

[0039] In some technical solutions, optionally, the UV resin whose absorption peak matches the absorption spectrum of the composite photoinitiator is at least one of fatty acid modified acrylate resin, polyether modified acrylate with a functionality of 2-4, and polyurethane acrylate with a functionality of 4-6.

[0040] In this technical solution, the UV resin whose absorption peak matches the absorption spectrum of the composite photoinitiator is at least one of fatty acid modified acrylate resin, polyether modified acrylate with a functionality of 2-4, and polyurethane acrylate with a functionality of 4-6. Using a UV resin whose absorption spectrum matches the composite photoinitiator can bring good compatibility, matching absorption characteristics, excellent performance, and diverse choices, which helps to achieve an efficient and stable photocuring process and obtain a photocured structure with excellent performance.

[0041] In some technical solutions, the composite photoinitiator may optionally be a mixture of acylphosphine oxide, α-hydroxy ketone derivative, α-amino ketone derivative, benzoyl and its derivatives, and triarylthioonium salt, wherein the mass percentage of each component of the composite photoinitiator is as follows: acylphosphine oxide, 30%–40%; α-hydroxy ketone derivative, 15%–25%; α-amino ketone derivative, 15%–25%; benzoyl and its derivatives, 10%–20%; and triarylthioonium salt, 10%–20%.

[0042] In this technical solution, the composite photoinitiator is specifically defined as a mixture of acylphosphine oxide, α-hydroxy ketone derivative, α-amino ketone derivative, benzoyl and its derivatives and triarylthionium salt, and the mass percentage of each component is specified, which enables the composite photoinitiator to have high initiation efficiency and stability.

[0043] In some technical solutions, optionally, the structural formula of the alicyclic epoxy acrylate resin with dual curing functional groups is as follows:

[0044]

[0045] In this technical solution, the structural formula of an alicyclic epoxy acrylate resin with dual curing functional groups is described, which is a compound containing cyclic amine compounds and silicon oxide cyclic compounds.

[0046] This application synthesizes a dual-curing resin, combines it with other UV-curing resins whose absorption peaks match the absorption spectra of the composite photoinitiator in the formulation, and monomers, and limits the mass fraction of each component to obtain an ink. This ink is suitable for high-speed printing processes of 100m / min to 150m / min. When used with the UV equipment of a coding machine, the ink can be fully cured, resulting in high-quality numbers and embossed graphics.

[0047] In some technical solutions, the pigment wetting and dispersing aid may optionally be a highly branched copolymer with multiple anchoring groups.

[0048] In this technical solution, a highly branched copolymer with multiple anchoring groups is used as a pigment wetting and dispersing agent, which can achieve excellent pigment wetting and dispersing performance, thereby improving printing effect and reducing production cost.

[0049] In some technical solutions, the substrate wetting aid is an organosilicon polyether copolymer.

[0050] In this technical solution, the substrate wetting agent is an organosilicon polyether copolymer, which has excellent wetting properties, thus helping to improve the uniformity and effect of printing.

[0051] In some technical solutions, the ink is optionally used for letterpress or number printing.

[0052] In this technical solution, the ink used in this application is suitable for letterpress or number printing. The various performance indicators of the ink after curing, such as wrinkle resistance, abrasion resistance, washability, and resistance to various physical and chemical properties, meet the standards issued by the domestic banknote printing industry.

[0053] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0054] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0055] Figure 1 A schematic diagram of UV light irradiating ink is shown in one embodiment of the present invention;

[0056] Figure 2 A comparative schematic diagram of the spectrum of the composite photoinitiator in one embodiment of the present invention is shown. Detailed Implementation

[0057] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0058] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0059] In one embodiment of this application, an ink is provided, comprising the following components by weight percentage: solid material, 15%–60%; UV-curable resin, 25%–50%; dual-curable resin, 1%–15%; monomer, 0%–3%; composite photoinitiator, 5%–12%; and additives, 1%–4%. The solid material is anti-counterfeiting material, pigment, and filler. The UV-curable resin is one or a mixture of several UV resins whose absorption peak matches the absorption spectrum of the composite photoinitiator. The dual-curable resin is an alicyclic epoxy acrylate resin having dual curing functional groups. The monomer is one or a mixture of several of trimethylolpropane triacrylate, tripropylene glycol diacrylate, and ethyl ethoxypropionate. The composite photoinitiator is one or a mixture of several of acylphosphine oxide, α-hydroxy ketone derivative, α-amino ketone derivative, benzoyl and its derivatives, and triarylthionium salt. The additives are pigment wetting and dispersing aids or substrate wetting aids.

[0060] In this embodiment, the ink proposed in this invention specifically includes solid materials, UV-curable resin, dual-curable resin, monomers, composite photoinitiator, and additives. Specifically, by weight percentage, the ink comprises the following components: solid materials, 15%–60%; UV-curable resin, 25%–50%; dual-curable resin, 1%–15%; monomers, 0%–3%; composite photoinitiator, 5%–12%; and additives, 1%–4%.

[0061] This application synthesizes a dual-curing resin, combines it with other UV-curing resins whose absorption peaks match the absorption spectra of the composite photoinitiator in the formulation, and monomers, and limits the mass fraction of each component to obtain an ink. This ink is suitable for high-speed printing processes of 100m / min to 150m / min. When used with the UV equipment of a coding machine, the ink can be fully cured, resulting in high-quality numbers and embossed graphics.

[0062] Specifically, by weight percentage, the ink comprises the following components: solid materials, 15%–60%; UV-curable resin, 25%–50%; dual-curable resin, 1%–15%; monomers, 0%–3%; composite photoinitiator, 5%–12%; and additives, 1%–4%. In this case, the ink may contain 44% solid materials, 35% UV-curable resin, 10% dual-curable resin, 2% monomers, 7% composite photoinitiator, and 2% additives.

[0063] The ink can also consist of 35.5% solid materials, 45% UV-curable resin, 8% dual-curable resin, 0.5% monomers, 9% composite photoinitiators, and 2% additives.

[0064] The ink can also consist of 40% solid materials, 30% UV-curable resin, 14% dual-curable resin, 2% monomers, 11% composite photoinitiators, and 3% additives.

[0065] The ink can also consist of 36% solid materials, 40% UV-curable resin, 12% dual-curable resin, 1.5% monomers, 7% composite photoinitiators, and 3.5% additives.

[0066] In practical applications, specific adjustments can be made according to the above range.

[0067] Specifically, the solid materials include anti-counterfeiting materials, pigments, and fillers. Anti-counterfeiting materials enable the ink to be anti-counterfeited, while pigments are mainly responsible for coloring the ink and giving it specific colors and properties.

[0068] Fillers in inks can effectively improve the printability and stability of the inks, while also enhancing their anti-counterfeiting properties. Fillers can improve the rheological properties, viscosity, and consistency of inks, increase printing speed, and prevent ink loss during transportation.

[0069] UV-curable resin is one or a mixture of several UV resins whose absorption peaks match the absorption spectrum of the composite photoinitiator. UV-curable resin is a special type of resin material that can rapidly cure under UV light irradiation. During the UV curing process, the composite photoinitiator absorbs the energy of the UV light, generating a reaction that initiates cross-linking of the resin's molecular chains, forming a stable cured product.

[0070] This application sets the UV-curable resin to be one or a mixture of several UV resins whose absorption peak matches the absorption spectrum of the composite photoinitiator, thereby ensuring that the energy of the composite photoinitiator can be fully utilized during the UV curing process to achieve an effective curing reaction.

[0071] Specifically, such as Figure 2 The diagram shows a comparative schematic of the absorption spectrum of the composite photoinitiator, where Gamma-Rays represents gamma rays, X-Rays represents X-rays, Infra Red represents infrared light, microwaves represent microwaves, Radioavos represents radio waves, UV (Ultraviolet Rays) represents UV light, Visible light represents visible light, VUV (Vacuum Ultraviolet) represents vacuum ultraviolet light, UVC (Vacuum Ultraviolet-C) represents short-wave ultraviolet light, UVB (Vacuum Ultraviolet-B) represents ultraviolet light with a wavelength of 280nm to 315nm, UVA (Vacuum Ultraviolet-A) represents long-wave ultraviolet light with a wavelength range of 320nm to 400nm, Wavelength represents wavelength, and radiation energy represents radiation energy.

[0072] The dual-curing resin is an alicyclic epoxy acrylate resin with dual curing functional groups. This application adopts a special design for the dual-curing resin. The alicyclic epoxy acrylate resin with dual curing functional groups has two or more curing functional groups that can undergo cross-linking reactions. After cross-linking with other components in the ink, it can form a more stable and robust network molecular structure.

[0073] Dual-curing resins have a more stable molecular structure and are less susceptible to external environmental influences. Using this type of resin can reduce changes in inks during storage and use, thereby improving ink stability.

[0074] Dual-curing resins can improve printability. The molecular structure of dual-curing resins is flexible, which can improve the flowability and wettability of inks, thereby enhancing printability.

[0075] In addition, the aforementioned dual-curing resin can increase the uniqueness of the ink formulation, which is difficult to replicate and counterfeit, thereby increasing the anti-counterfeiting performance of the ink and improving the security and credibility of the product.

[0076] Alicyclic epoxy acrylate resins with dual curing functional groups are prepared by epoxidizing dienes, which enhances their heat resistance and chemical corrosion resistance. The epoxidation reaction can convert the double bonds in the resin molecule into epoxy groups. These epoxy groups have high heat resistance and chemical corrosion resistance. Therefore, epoxidized alicyclic epoxy acrylate resins with dual curing functional groups have better heat resistance and chemical corrosion resistance.

[0077] The monomer is one or a mixture of several of trimethylolpropane triacrylate, tripropylene glycol diacrylate, and ethyl ethoxypropionate. In inks, the monomer is an important component, primarily used to react with composite photoinitiators to form copolymers, thereby curing the ink.

[0078] The monomer can be trimethylolpropane triacrylate, which has high polarity and reactivity and can improve the performance of the polymer.

[0079] The monomer can also be tripropylene glycol diacrylate, which has lower polarity and higher glass transition temperature, thus improving the thermal stability of the polymer.

[0080] The monomer can also be ethyl ethoxypropionate, which has low polarity and good solubility, and can improve the solubility and flowability of the polymer.

[0081] Monomers can also be mixtures of the above-mentioned substances. By mixing these substances, complementary advantages can be achieved, resulting in polymers with better performance.

[0082] Composite photoinitiators are one or more mixtures of acylphosphine oxides, α-hydroxy ketone derivatives, α-amino ketone derivatives, benzoyl and its derivatives, triarylthionium salts, etc. Composite photoinitiators are composed of a mixture of various photoinitiators, each component possessing different light absorption and photoinitiation effects. When mixed together, they complement each other, improving photoinitiation efficiency and curing effect.

[0083] Acylphosphine oxides possess high light absorption capacity and initiation activity, which can promote polymer chain growth. α-Hydroxyketone derivatives and α-aminoketone derivatives absorb energy, and the resulting free radicals can undergo cross-linking reactions with unsaturated double bonds in resins to form high-molecular-weight polymers. Benzoyl and its derivatives can initiate polymer chain growth and also promote resin cross-linking reactions. Triarylthionium salts possess high initiation activity and light absorption capacity, and can promote chain growth and cross-linking reactions in cationic polymerization.

[0084] The additives are pigment wetting and dispersing agents or substrate wetting agents. On one hand, as pigment wetting and dispersing agents, they improve the dispersibility of pigments in ink, prevent pigment agglomeration, and enhance the dispersion stability and tinting strength of pigments. On the other hand, pigment wetting and dispersing agents can reduce the surface tension of ink, promote ink leveling on the substrate surface during printing, and improve the smoothness and gloss of the ink layer.

[0085] On the other hand, the additive is a substrate wetting agent. The substrate wetting agent can reduce the surface tension between the ink and the substrate, promote the wetting and spreading of the ink on the substrate surface, and improve the adhesion and uniformity of the ink layer.

[0086] In some embodiments, the ink optionally comprises the following components by weight percentage: solid material, 35% to 55%; UV-curable resin, 25% to 40%; dual-curable resin, 5% to 10%; monomer, 0% to 2%; composite photoinitiator, 8% to 12%; and additives, 2% to 3%.

[0087] In this embodiment, the proportions of the ink components are further refined, with the following components: solid material, 35%–55%; UV-curable resin, 25%–40%; dual-curing resin, 5%–10%; monomer, 0%–2%; composite photoinitiator, 8%–12%; and additives, 2%–3%. This allows the ink to adapt to different printing speeds, meet the needs of high-speed printing, and adapt to different curing speeds and degrees, thereby improving the printability and stability of the ink.

[0088] Specifically, the ink may consist of 49% solid materials, 30% UV-curable resin, 8% dual-curable resin, 1% monomer, 9% composite photoinitiator, and 3% additives.

[0089] The ink can also consist of 50% solid materials, 30% UV-curable resin, 6% dual-curable resin, 1.5% monomers, 9.5% composite photoinitiator, and 3% additives.

[0090] In some embodiments, optionally, the alicyclic epoxy acrylate resin having dual curing functional groups is prepared by epoxidizing a diene.

[0091] In this embodiment, the alicyclic epoxy acrylate resin with dual curing functional groups is prepared by epoxidizing a diene, thereby enhancing its heat resistance and chemical corrosion resistance. The epoxidation reaction converts the double bonds in the resin molecule into epoxy groups, which possess high heat resistance and chemical corrosion resistance. Therefore, the epoxidized alicyclic epoxy acrylate resin with dual curing functional groups exhibits better heat resistance and chemical corrosion resistance. Furthermore, the alicyclic epoxy acrylate resin with dual curing functional groups inherently has a fast curing speed. After epoxidation, the epoxy groups in the resin molecule can further increase the curing speed, improving the curing efficiency of the ink.

[0092] In some embodiments, the UV-curable resin may optionally be a mixture of several UV resins whose absorption peaks match the absorption spectrum of the composite photoinitiator, wherein the active groups of the several UV resins whose absorption peaks match the absorption spectrum of the composite photoinitiator have different structures.

[0093] In this embodiment, the UV-curable resin is a mixture of several UV resins whose absorption peaks match the absorption spectrum of the composite photoinitiator. The active groups of these UV resins have different structures. By selecting a UV resin whose absorption spectrum matches the composite photoinitiator, maximum light energy absorption within a specific wavelength range can be ensured, thereby improving photoinitiation efficiency and curing effect.

[0094] Using UV resins with different active group structures can provide a wider range of chemical reaction possibilities, which helps to optimize the crosslinking reaction during the curing process and improve the performance of the cured ink layer.

[0095] By combining UV resins with different active group structures, a more complex cross-linked network structure can be formed, increasing the cross-linking density of the ink layer. This will improve the weather resistance of the ink layer, enabling it to better resist the effects of environmental factors.

[0096] In some embodiments, optionally, the alicyclic epoxy acrylate resin having dual curing functional groups is synthesized with active groups via an unsaturated matrix and peracid.

[0097] In this embodiment, the active groups of the alicyclic epoxy acrylate resin with dual curing functional groups synthesized by the reaction of unsaturated matrix and peracid can enhance crosslinking density, adhesion and broaden the application range. The resin has no unsaturated double bonds in its molecular structure, low viscosity and high reactivity.

[0098] In some embodiments, optionally, the UV resin whose absorption peak matches the absorption spectrum of the composite photoinitiator is at least one of fatty acid modified acrylate resin, polyether modified acrylate with a functionality of 2-4, and polyurethane acrylate with a functionality of 4-6.

[0099] In this embodiment, the UV resin whose absorption peak matches the absorption spectrum of the composite photoinitiator is at least one of fatty acid modified acrylate resin, polyether modified acrylate with a functionality of 2-4, and polyurethane acrylate with a functionality of 4-6. Using a UV resin whose absorption spectrum matches the composite photoinitiator can bring good compatibility, matching absorption characteristics, excellent performance, and diverse choices, which helps to achieve an efficient and stable photocuring process and obtain a photocurable ink layer or structure with excellent performance.

[0100] Specifically, these UV resins have good compatibility with composite photoinitiators, which helps to achieve better uniform dispersion and reaction during the curing process, thus ensuring the uniformity and performance stability of the photocured ink layer or structure.

[0101] The absorption peaks of these UV resins match the absorption spectra of the composite photoinitiators. They can effectively absorb and transfer energy, promote the activation of the photoinitiator and the photocuring reaction, and reduce energy waste. They can be used in conjunction with composite photoinitiators to obtain photocurable ink layers or structures with excellent performance.

[0102] A diverse range of options are available, including fatty acid-modified acrylate resins, polyether-modified acrylates with a functionality of 2-4, and polyurethane acrylates with a functionality of 4-6. Depending on specific application requirements, suitable UV resins can be selected and combined with composite photoinitiators to achieve optimal performance.

[0103] In some embodiments, optionally, the composite photoinitiator is a mixture of acylphosphine oxide, α-hydroxy ketone derivative, α-amino ketone derivative, benzoyl and its derivatives, and triarylthioonium salt, wherein the mass percentage of each component of the composite photoinitiator is: acylphosphine oxide, 30%–40%; α-hydroxy ketone derivative, 15%–25%; α-amino ketone derivative, 15%–25%; benzoyl and its derivatives, 10%–20%; and triarylthioonium salt, 10%–20%.

[0104] In this embodiment, the composite photoinitiator is specifically defined as a mixture of acylphosphine oxide, α-hydroxy ketone derivative, α-amino ketone derivative, benzoyl and its derivatives and triarylthionium salt, and the mass percentage of each component is defined, which can make the composite photoinitiator have high initiation efficiency and stability.

[0105] Specifically, the composite photoinitiator can be composed of 35% acylphosphine oxide, 20% α-hydroxy ketone derivative, 20% α-amino ketone derivative, 15% benzoyl and its derivatives, and 10% triarylthioonium salt.

[0106] In some embodiments, optionally, the alicyclic epoxy acrylate resin having dual curing functional groups has the following structural formula:

[0107]

[0108] In this embodiment, the structural formula of an alicyclic epoxy acrylate resin having dual curing functional groups is described, which is a compound containing cyclic amine compounds and cyclic silica compounds.

[0109] This application utilizes a self-synthesized dual-curing resin, combined with other UV-curing resins whose absorption peaks match the absorption spectra of the composite photoinitiator in the formulation, and monomers, etc., to limit the mass fraction of each component, thereby producing a UV-curable embossed and serial number anti-counterfeiting ink. This ink is suitable for high-speed printing processes of 100m / min to 150m / min. When used with the UV equipment of a serial number printer, the ink can be fully cured, resulting in high-quality serial numbers and embossed graphics.

[0110] In some embodiments, the pigment wetting and dispersing aid may optionally be a highly branched copolymer having multiple anchoring groups.

[0111] In this embodiment, using a highly branched copolymer with multiple anchoring groups as a pigment wetting and dispersing agent can achieve excellent pigment wetting and dispersing performance, enhance pigment stability, improve printing effect, and reduce production cost.

[0112] Specifically, highly branched copolymers with multiple anchoring groups can effectively adsorb onto the pigment surface, forming a stable dispersion system. This additive can effectively reduce the interfacial tension between the pigment and the solvent, thereby improving the wetting properties of the pigment. The highly branched copolymers with multiple anchoring groups form a thicker adsorption layer on the pigment surface, which can effectively increase the steric hindrance between pigment particles, preventing pigment particles from approaching each other and agglomerating, thus improving product quality and stability.

[0113] Using highly branched copolymers with multiple anchoring groups as pigment wetting and dispersing agents can make the pigments more evenly dispersed on the substrate surface during printing, improving the clarity and color vibrancy of the printed image. At the same time, due to the good branched structure of the agent, it can also improve the pigment's color development performance and leveling properties to a certain extent.

[0114] Compared with traditional pigment wetting and dispersing agents, highly branched copolymers with multiple anchoring groups have a higher cost performance. Due to their structural characteristics and excellent performance, they can reduce the amount of pigment used and lower production costs, while improving product quality and stability.

[0115] In some embodiments, the substrate wetting aid is an organosilicon polyether copolymer.

[0116] In this technical solution, the substrate wetting agent is an organosilicon polyether copolymer. Organosilicon polyether copolymer has excellent wetting properties and can quickly and uniformly wet the surface of various substrates, including plastics, paper, metals, etc., which helps to improve the uniformity and effect of printing.

[0117] Organosilicon polyether copolymers can maintain good stability and color durability in outdoor environments, which helps to improve the lifespan of ink layers.

[0118] Organosilicon polyether copolymers have strong resistance to various chemicals and are not easily corroded by chemicals such as acids, alkalis, and salts, which helps to improve the stability and durability of the ink layer after printing.

[0119] In some embodiments, the ink may be used for letterpress or number printing.

[0120] In this technical solution, the ink of the present invention is suitable for letterpress or number printing. The various performance indicators of the ink after curing, such as wrinkle resistance, abrasion resistance, washability, and resistance to various physical and chemical properties, meet the standards issued by the domestic banknote printing industry.

[0121] In some embodiments, the UV light source is optionally a semiconductor light source that can directly convert electrical energy into light and radiation energy, and can be applied to point light sources and surface light sources for ink curing.

[0122] like Figure 1 The diagram shows a schematic of the ink proposed in this application when irradiated by a UV light source. In this diagram, the unsaturated resin+photoinitiator is a UV-curable resin plus a composite photoinitiator. After being irradiated by UV light, the photoinitiator breaks down to form free radicals, and finally resin crosslinks.

[0123] In some embodiments, the above-mentioned ink can be prepared by either the direct infusion method or the two-step method of base ink-ink forming. The direct infusion method involves adding all the components in the formula at once according to the formula ratio, and then mixing, stirring, and rolling them into the finished ink according to the sub-requirements of the production process.

[0124] The two-step method of base ink and finished ink involves first mixing and stirring anti-counterfeiting materials, a portion of resin, a portion of solid fillers, and additives in a certain proportion, then rolling them through a three-roll mill to form base ink. Next, pigments, the remaining resins, photoinitiators, monomers, and additives are mixed with the base ink to form premixed ink, which is then rolled through a three-roll mill to a certain fineness. Finally, based on the ink performance test results, adjustments are made to the finished ink if necessary, completing the ink preparation process.

[0125] In this invention, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0126] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which 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.

[0127] 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. An ink, characterized in that, The ink comprises the following components by weight percentage: Solid materials, 15%~60%; UV-curable resin, 25%~50%; Dual-curing resin, 1%~15%; Monomer, 0%~3%; Composite photoinitiator, 5%~12%; Additives, 1%~4%; The solid material is an anti-counterfeiting material, pigment, and filler; The UV-curable resin is one or a mixture of several UV resins whose absorption peaks match the absorption spectrum of the composite photoinitiator. The dual-curing resin is an alicyclic epoxy acrylate resin with dual curing functional groups; The monomer is one or a mixture of several of the following: trimethylolpropane triacrylate, tripropylene glycol diacrylate, and ethyl ethoxypropionate. The composite photoinitiator is one or a mixture of several of the following: acylphosphine oxide, α-hydroxy ketone derivative, α-amino ketone derivative, benzoyl and its derivatives, and triarylthioonium salt; The additive is a pigment wetting and dispersing additive or a substrate wetting additive; The structural formula of the alicyclic epoxy acrylate resin with dual curing functional groups is as follows: 。 2. The ink according to claim 1, characterized in that, The ink comprises the following components by weight percentage: Solid materials, 35%~55%; UV-curable resin, 25%~40%; Dual-curing resin, 5%~10%; Monomer, 0%~2%; Composite photoinitiator, 8%~12%; Additives, 2%~3%.

3. The ink according to claim 1 or 2, characterized in that, The alicyclic epoxy acrylate resin with dual curing functional groups is prepared by epoxidation of dienes.

4. The ink according to claim 1 or 2, characterized in that, The alicyclic epoxy acrylate resin with dual curing functional groups is synthesized with active groups through an unsaturated matrix and peracid.

5. The ink according to claim 1 or 2, characterized in that, The UV resin whose absorption peak matches the absorption spectrum of the composite photoinitiator is at least one of fatty acid modified acrylate resin, polyether modified acrylate with a functionality of 2-4, and polyurethane acrylate with a functionality of 4-6.

6. The ink according to claim 1 or 2, characterized in that, The composite photoinitiator is a mixture of acylphosphine oxide, α-hydroxy ketone derivative, α-amino ketone derivative, benzoyl and its derivatives, and triarylthionium salt, wherein the mass percentage of each component of the composite photoinitiator is: Acylphosphine oxides, 30%~40%; α-Hydroxyketone derivatives, 15%~25%; α-Aminoketone derivatives, 15%~25%; Benzoyl and its derivatives, 10%~20%; Triarylsulfonium salt, 10%~20%.

7. The ink according to claim 1 or 2, characterized in that, The pigment wetting and dispersing aid is a highly branched copolymer with multiple anchoring groups.

8. The ink according to claim 1 or 2, characterized in that, The substrate wetting agent is an organosilicon polyether copolymer.

9. The ink according to claim 1 or 2, characterized in that, The ink is used for letterpress or number printing.

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