A UV-LED Curable Black Inkjet Material, Its Preparation Method and Application

Abstract

This invention discloses a UV-LED-curable black inkjet material, its preparation method, and its application. The inkjet material comprises the following raw materials: a photoinitiator; a UV monomer; oligomers; additives; and nano-black paste; wherein the oligomers include at least one of a photocurable resin, a thermocurable resin, and a photothermal dual-curable resin; wherein the photothermal dual-curable resin includes a polyurethane acrylic resin with isocyanate groups. The inkjet material of this invention is a UV-LED-curable black inkjet material that can be directly printed on white ink blocks, and the inkjet material of this invention exhibits excellent flexibility and adhesion.

Description

Technical Field

[0001] This invention relates to the field of inkjet materials technology, and in particular to a UV-LED-curable black inkjet material, its preparation method, and its application. Background Technology

[0002] Barcodes and QR codes are often found on the surface of PCBs. These barcodes and QR codes serve as a kind of "identity card" for each PCB, enabling quality control during the PCB manufacturing process. They contain important information such as raw material procurement, production process and technology, product batch, manufacturer, production date, and product destination. This information is used to mark each step of the PCB manufacturing process to facilitate subsequent quality control and traceability of process issues, playing a vital role in traceability, supervision, and management.

[0003] Printing barcodes and QR codes on PCBs was initially done using screen printing, though some manufacturers used simpler methods like PCB stickers. Generally, traditional screen printing could meet existing market demands, but with the continuous upgrading of electronic products, the quality requirements for circuit boards have become increasingly stringent. Traditional screen printing lacks precision, leading to blurry small characters, poor aesthetics, ghosting, and contamination issues such as solvent evaporation. This makes traditional screen printing unsuitable for the new technological requirements.

[0004] Currently, the production process for PCB QR codes involves screen printing or inkjet printing to create white ink blocks for the characters, followed by laser engraving of the QR codes onto these blocks. Laser engraving offers advantages such as high precision and speed; through computer control, it can engrave various complex texts and patterns onto the PCB ink blocks, meeting the high-quality marking requirements of the current PCB industry and significantly aiding in circuit board production. However, its disadvantage is that laser engraving disrupts the structural integrity of the ink blocks, posing a risk of brittle detachment due to friction and impact, thus challenging the flexibility and adhesion of the ink itself.

[0005] Therefore, there is an urgent need to develop a new method to replace laser engraving for manufacturing PCB QR codes. Summary of the Invention

[0006] The first technical problem to be solved by this invention is:

[0007] An inkjet material is provided.

[0008] The second technical problem to be solved by this invention is:

[0009] A method for preparing the inkjet material is provided.

[0010] The third technical problem to be solved by this invention is:

[0011] The application of the inkjet material.

[0012] The present invention also proposes a UV-curable inkjet printing ink, comprising the aforementioned inkjet material.

[0013] To solve the first technical problem, the technical solution adopted by the present invention is as follows:

[0014] An inkjet material comprising the following raw materials:

[0015] Photoinitiator;

[0016] UV monomers;

[0017] Oligomers;

[0018] Additives;

[0019] Nano black paste;

[0020] Among them, oligomers include at least one of photocurable resin, thermocurable resin, and photothermal dual-curable resin;

[0021] Among them, photothermal dual-curing resins include polyurethane acrylic resins with isocyanate groups.

[0022] According to embodiments of the present invention, one of the technical solutions has at least one of the following advantages or beneficial effects:

[0023] (1) The thermosetting mechanism of the inkjet material of the present invention is that the isocyanate group (-NCO) contained in the photothermal dual-curing resin or the thermosetting resin undergoes a thermal polymerization reaction with the hydroxyl group (-OH) in the UV monomer (such as 4-HBA monomer) at a high temperature above 110°C to achieve the curing purpose. Experiments have shown that the photothermal dual-curing resin can be thermo-cured and also participates in photocuring. Its effect in connecting the photocuring system and the thermocuring system is better than that of the system that uses only the thermosetting resin for thermocuring. For example, the system of Examples 1 and 2 using the dual-curing resin (EBECRYL*4250) has a hardness 1H higher than that of Example 3 using only the thermosetting resin (Txiene BI 7981).

[0024] (2) The photothermal dual-curing resin used in this invention is a polyurethane acrylate oligomer containing isocyanate groups. Its molecular chain structure contains urethane (-N-COO-), acrylate, and isocyanate groups (-NCO), combining the excellent properties of polyurethane, acrylic resin, and isocyanate. Among them, polyurethane acrylate has excellent flexibility and adhesion, unsaturated carbon-carbon double bonds that can participate in photoreaction, and crosslinking effect of isocyanate. The epoxy acrylate used in this invention has excellent high temperature resistance and hardness due to the presence of benzene rings, as well as the excellent flexibility of long aliphatic chains of aliphatic epoxy acrylate (such as Genomer*2235). In addition, the hydroxyl groups (-OH) left after the epoxy structure is bonded to the ring-opening esterification of acrylic acid can undergo thermal polymerization reaction with isocyanate groups (-NCO) to crosslink, further strengthening the crosslinked network structure of the UV system and the thermosetting system.

[0025] (3) Through experiments, the present invention found that adding acrylate monomers with aliphatic long chains has a good plasticizing effect, which can reduce the Tg value of the system and increase flexibility.

[0026] According to one embodiment of the present invention, the inkjet material comprises the following raw materials in parts by weight:

[0027] Photoinitiator, 7-10 parts;

[0028] UV monomer, 50-70 parts;

[0029] Oligomer, 5-20 parts;

[0030] Additives, 0.05–0.5 parts;

[0031] Nano black paste, 3-10 parts.

[0032] According to one embodiment of the present invention, the photoinitiator includes at least one of TPO (2,4,6-trimethylbenzoyl-diphenylphosphine oxide), TPO-L (ethyl 2,4,6-trimethylbenzoylphenylphosphine), 819 (phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide), ITX (2-isopropylthioxanthone), and EDB (ethyl 4-dimethylaminobenzoate).

[0033] The photoinitiator is a long-wavelength free radical photoinitiator that absorbs ultraviolet light energy of a specific wavelength to generate active centers that can initiate photopolymerization reactions.

[0034] According to one embodiment of the present invention, the UV monomer includes at least one of monofunctional monomers and difunctional monomers; wherein, the monofunctional monomer includes at least one of vinyl reactive monomers, hydroxyl-containing acrylate monomers, and aliphatic long-chain acrylate monomers; wherein, the difunctional monomer includes at least one of 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, neopentyl glycol diacrylate, and tetraethylene glycol diacrylate.

[0035] According to one embodiment of the present invention, the vinyl active monomer includes at least one of ACMO (N-acryloylmorpholine), DMAA (N,N-dimethylacrylamide), and DEAA (N,N-diethyldiacrylamide).

[0036] According to one embodiment of the present invention, the hydroxyl-containing acrylic monomer includes at least one of 4-HBA (4-hydroxybutyl acrylate), CA (caprolactone acrylate), and HEMA (2-hydroxyethyl acrylate).

[0037] According to one embodiment of the present invention, the acrylate monomer with aliphatic long chain includes at least one of IDA (isodecyl acrylate), LA (lauryl acrylate), and SA (octadecyl acrylate).

[0038] According to one embodiment of the present invention, the oligomer is the main body of the photocurable inkjet printer and serves as the binder for the inkjet printer. Its properties essentially determine the main properties of the cured material.

[0039] According to one embodiment of the present invention, the photocurable resin includes at least one of epoxy acrylate resin, polyurethane acrylate resin, polyester acrylate resin, polyether acrylate resin and pure acrylic resin.

[0040] Among them, epoxy acrylate is obtained by ring-opening esterification of acrylic acid and epoxy resin to introduce carbon-carbon double bonds. Its molecular structure contains unsaturated carbon-carbon double bonds and can undergo photocuring reaction.

[0041] According to one embodiment of the present invention, the epoxy acrylate includes at least one of EBECRIL*3105, EBECRIL*3740, Rahn’s Genomer*2235, and Meiyuan’s EA2259.

[0042] According to one embodiment of the present invention, the thermosetting resin comprises isocyanate. The isocyanate has an isocyanate group in its molecular structure and is capable of undergoing a thermosetting reaction.

[0043] According to one embodiment of the present invention, the isocyanate includes LANXESS isocyanate.

[0044] According to one embodiment of the present invention, LANXESS isocyanates include at least one of Txiene BI 7981, Txiene BI 7984, Txiene BI 7991, and Txiene BI 7992.

[0045] According to one embodiment of the present invention, the polyurethane acrylic resin with isocyanate groups has a molecular structure containing both unsaturated carbon-carbon double bonds and isocyanate groups. The unsaturated carbon-carbon double bonds can undergo photocuring, and the isocyanate groups can undergo thermocuring.

[0046] According to one embodiment of the present invention, the additive includes at least one of a leveling agent and a polymerization inhibitor.

[0047] According to one embodiment of the present invention, the leveling agent includes at least one of TEGO 410, TEGO 425, TEGO 432, TEGO 435, TEGO 450, TEGO 2200n, TEGO 2300, BYK 307, BYK 354, BYK 377, BYK 379, and BYK 361n.

[0048] According to one embodiment of the present invention, the polymerization inhibitor includes at least one of Rahn's Genorad*16, Genorad*18, Genorad*20, Genorad*21, and Genorad*22.

[0049] According to one embodiment of the present invention, the components of the nano black paste include acrylate monomers, carbon black, and dispersant.

[0050] According to one embodiment of the present invention, the nano black paste comprises the following components in parts by weight:

[0051] acrylate monomer, 65-75 parts;

[0052] Carbon black, 20-30 parts;

[0053] Dispersant, 5-8 parts.

[0054] According to one embodiment of the present invention, the acrylate monomer in the color paste component includes at least one of HDDA (1,6-hexanediol diacrylate), DPGDA (dipropylene glycol diacrylate), TPGDA (tripropylene glycol diacrylate), NPGDA (neopentyl glycol diacrylate), and PET3A (pentaerythritol triacrylate).

[0055] According to one embodiment of the present invention, the carbon black in the color paste component includes at least one of Mitsubishi carbon black #850, Mitsubishi carbon black #900, Mitsubishi carbon black #950, Mitsubishi carbon black #960, Mitsubishi carbon black #970, Mitsubishi carbon black #980, Mitsubishi carbon black #1000, Mitsubishi carbon black #2300, Mitsubishi carbon black #2350, Mitsubishi carbon black #2600, and Mitsubishi carbon black #2650.

[0056] According to one embodiment of the present invention, the dispersant in the color paste component includes at least one of BASF efka 4030, BASF efka 4310, BASF efka 4330, BASF efka PX4701, BASF efka PX7701, BYKJET-9150, BYKJET-9151, BYKJET-9152, and Lurunbo Solsperse 24000, Solsperse 28000, Solsperse 36000, and Solsperse 39000.

[0057] According to one embodiment of the present invention, the polyurethane acrylic resin with isocyanate groups includes at least one of EBECRIL*4250, EBECRIL*4396, and EBECRIL*4397 from Zhanxin.

[0058] According to an embodiment of the present invention, when the inkjet material of the present invention includes a photothermal dual-curing resin, and the photothermal dual-curing resin is EBECRYL*4250, EBECRYL*4250 is a polyurethane acrylate with isocyanate groups, an -NCO content of approximately 5%, a carbon-carbon double bond functionality of approximately 3.4, and a viscosity of approximately 2000 cp at 25°C. Adding EBECRYL*4250 to the inkjet material of the present invention can improve adhesion. Furthermore, the degree of crosslinking is higher when using a photothermal dual-curing resin than when using a thermosetting resin. This is because the photothermal dual-curing resin can undergo both thermosetting and photocuring reactions, while isocyanate thermosetting resins can only undergo thermosetting reactions.

[0059] According to embodiments of the present invention, when the inkjet material of the present invention includes EBECRYL*4396, EBECRYL*4397, or EBECRYL*4250, the viscosity of the ink in the inkjet material containing EBECRYL*4396 or EBECRYL*4397 is significantly higher than that in the inkjet material containing EBECRYL*4250, and the degree of crosslinking decreases, resulting in poorer adhesion. This is because EBECRYL*4396 has an -NCO content of approximately 7.5%, a carbon-carbon double bond functionality of 1, and a viscosity of approximately 14000 cp at 25°C; while EBECRYL*4397 has an -NCO content of approximately 6.7%, a carbon-carbon double bond functionality of 1, and a viscosity of approximately 11000 cp at 25°C. Both resins have higher viscosities and lower carbon-carbon double bond functionality than EBECRYL*4250, resulting in poorer performance in the inkjet material of the present invention.

[0060] According to an embodiment of the present invention, when the inkjet material of the present invention includes the photocurable resin EBECRYL*3105, EBECRYL*3105 is an aromatic difunctional epoxy acrylate with an acid value of 5 mg / kg KOH and a viscosity of approximately 600 cp at 60°C. It exhibits poor reactivity, slow reaction, and incomplete photocuring, leading to problems such as poor curing, blistering during high-temperature tin dipping, and significant peeling during adhesion testing. However, when the photocurable resin is replaced with Genomer*2235, which is an aliphatic difunctional epoxy acrylate with an acid value of 7 mg / kg KOH and a viscosity of approximately 1100 cp at 25°C, its better reactivity effectively overcomes the aforementioned problems.

[0061] According to an embodiment of the present invention, when the UV monomer in the inkjet material of the present invention is an acrylate monomer with aliphatic long chains, and when the acrylate monomer is ACMO, ACMO contains a morpholine ring and has a certain structural rigidity, using an acrylate monomer with aliphatic long chains to replace ACMO can reduce the Tg value of the system, increase flexibility, and reduce the hardness of the system.

[0062] According to an embodiment of the present invention, when the UV monomer in the inkjet material of the present invention is an acrylate monomer with an aliphatic long chain, and when the acrylate monomer is LA or IDA, the surface tension of the system will be reduced because the surface tension of the monomer is low.

[0063] To solve the second technical problem, the technical solution adopted by the present invention is as follows:

[0064] A method for preparing the inkjet material includes the following steps:

[0065] A transparent oil is obtained by mixing a photoinitiator, UV monomer, oligomer, and additives and stirring under light-protected conditions.

[0066] The transparent oil is mixed with nano black paste, stirred, and then filtered to obtain inkjet material.

[0067] Another aspect of the present invention provides a UV-curable inkjet printing ink. It includes the inkjet material described in the first aspect embodiment above. Since this application employs all the technical solutions of the aforementioned inkjet material, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0068] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Detailed Implementation

[0069] The terms "preferred," "more preferably," etc., used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0070] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0071] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present invention.

[0072] Unless otherwise specified, the reagents, methods and equipment used in this invention are all conventional reagents, methods and equipment in this technical field.

[0073] Example 1

[0074] An inkjet material comprising the following raw materials in parts by weight:

[0075] Photoinitiator, 9 parts;

[0076] UV monomer, 66.7 parts;

[0077] Oligomer, 18 parts;

[0078] Additives, 0.3 parts;

[0079] Nano black paste, 6 parts.

[0080] In Example 1, the UV monomers include ACMO, 4-HBA, and HDDA.

[0081] The weight ratio of ACMO:4-HBA:HDDA was 15:16.7:35, totaling 66.7 parts.

[0082] In Example 1, the oligomers include a photothermal dual-curing resin and a photocuring resin.

[0083] The photothermal dual-curing resin is EBECRYL*4250, and the photocuring resin is Genomer*2235.

[0084] Among them, EBECRYL*4250:Genomer*2235=10:8, totaling 18 copies.

[0085] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0086] Among them, TPO:819:ITX:EDB = 4:2:2:1, totaling 9 portions.

[0087] The additives include leveling agents and polymerization inhibitors.

[0088] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0089] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.3 portions.

[0090] The nano black paste comprises the following components by weight percentage:

[0091] DPGDA, 55%;

[0092] PET3A, 15%;

[0093] Carbon black, 25%;

[0094] BASF efka 4310, 5%.

[0095] The preparation of the above-mentioned nano black paste includes the following steps:

[0096] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0097] The preparation of the above inkjet material includes the following steps:

[0098] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano-black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained. This inkjet material is a UV-LED-curable black inkjet material that can be directly printed on white character ink blocks.

[0099] Example 2

[0100] An inkjet material comprising the following raw materials in parts by weight:

[0101] Photoinitiator, 9 parts;

[0102] UV monomer, 69.7 parts;

[0103] Oligomer, 15 parts;

[0104] Additives, 0.3 parts;

[0105] Nano black paste, 6 parts.

[0106] In Example 2, the UV monomers include ACMO, 4-HBA, and HDDA.

[0107] Among them, ACMO:4-HBA:HDDA = 15:16.7:38, totaling 69.7 copies.

[0108] In Example 2, the oligomer includes a photothermal dual-curing resin and a photocuring resin.

[0109] The photothermal dual-curing resin is EBECRYL*4250, and the photocuring resin is EBECRYL*3105.

[0110] Among them, EBECRYL*4250:EBECRYL*3105 = 10:5, totaling 15 portions.

[0111] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0112] Among them, TPO:819:ITX:EDB = 4:2:2:1, totaling 9 portions.

[0113] The additives include leveling agents and polymerization inhibitors.

[0114] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0115] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.3 portions.

[0116] The nano black paste comprises the following components by weight percentage:

[0117] DPGDA, 55%;

[0118] PET3A, 15%;

[0119] Carbon black, 25%;

[0120] BASF efka 4310, 5%.

[0121] The preparation of the above-mentioned nano black paste includes the following steps:

[0122] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0123] The preparation of the above inkjet material includes the following steps:

[0124] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano-black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained. This inkjet material is a UV-LED-curable black inkjet material that can be directly printed on white character ink blocks.

[0125] Example 3

[0126] An inkjet material comprising the following raw materials in parts by weight:

[0127] Photoinitiator, 9 parts;

[0128] UV monomer, 66.7 parts;

[0129] Oligomer, 18 parts;

[0130] Additives, 0.3 parts;

[0131] Nano black paste, 6 parts.

[0132] In Example 3, the UV monomers include ACMO, 4-HBA, and HDDA.

[0133] Among them, ACMO:4-HBA:HDDA = 15:16.7:35, totaling 66.7 copies.

[0134] In Example 3, the oligomer contains a thermosetting resin and a photocurable resin.

[0135] The thermosetting resin is Txiene BI 7981, and the photocuring resin is Genomer*2235.

[0136] Among them, Txiene BI 7981: Genomer*2235 = 10:8, totaling 18 copies.

[0137] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0138] Among them, TPO:819:ITX:EDB = 4:2:2:1, totaling 9 portions.

[0139] The additives include leveling agents and polymerization inhibitors.

[0140] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0141] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.3 portions.

[0142] The nano black paste comprises the following components by weight percentage:

[0143] DPGDA, 55%;

[0144] PET3A, 15%;

[0145] Carbon black, 25%;

[0146] BASF efka 4310, 5%.

[0147] The preparation of the above-mentioned nano black paste includes the following steps:

[0148] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0149] The preparation of the above inkjet material includes the following steps:

[0150] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano-black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained. This inkjet material is a UV-LED-curable black inkjet material that can be directly printed on white character ink blocks.

[0151] Example 4

[0152] An inkjet material comprising the following raw materials in parts by weight:

[0153] Photoinitiator, 7 parts;

[0154] UV monomer, 50 parts;

[0155] Oligomer, 5 parts;

[0156] Additives, 0.05 parts;

[0157] Nano black paste, 3 parts.

[0158] In Example 4, the UV monomers include ACMO, 4-HBA, and HDDA.

[0159] The weight ratio of ACMO:4-HBA:HDDA is 15:16.7:35, totaling 50 parts.

[0160] In Example 4, the oligomers include a photothermal dual-curing resin and a photocuring resin.

[0161] The photothermal dual-curing resin is EBECRYL*4250, and the photocuring resin is Genomer*2235.

[0162] Among them, EBECRYL*4250:Genomer*2235=10:8, totaling 5 portions.

[0163] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0164] Among them, TPO:819:ITX:EDB = 4:2:2:1, totaling 7 portions.

[0165] The additives include leveling agents and polymerization inhibitors.

[0166] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0167] Among them, TEGO 425: Genorad*16 = 0.05: 0.25, totaling 0.05 portions.

[0168] The nano black paste comprises the following components by weight percentage:

[0169] DPGDA, 55%;

[0170] PET3A, 15%;

[0171] Carbon black, 25%;

[0172] BASF efka 4310, 5%.

[0173] The preparation of the above-mentioned nano black paste includes the following steps:

[0174] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0175] The preparation of the above inkjet material includes the following steps:

[0176] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano-black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained. This inkjet material is a UV-LED-curable black inkjet material that can be directly printed on white character ink blocks.

[0177] Example 5

[0178] An inkjet material comprising the following raw materials in parts by weight:

[0179] Photoinitiator, 10 parts;

[0180] UV monomer, 70 parts;

[0181] Oligomer, 20 parts;

[0182] Additives, 0.5 parts;

[0183] Nano black paste, 10 parts.

[0184] In Example 5, the UV monomers include ACMO, 4-HBA, and HDDA.

[0185] The weight ratio of ACMO:4-HBA:HDDA was 15:16.7:35, totaling 70 parts.

[0186] In Example 5, the oligomers include a photothermal dual-curing resin and a photocuring resin.

[0187] The photothermal dual-curing resin is EBECRYL*4250, and the photocuring resin is Genomer*2235.

[0188] The ratio of EBECRYL*4250 to Genomer*2235 is 10:8, totaling 20 portions.

[0189] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0190] The ratio of TPO:819:ITX:EDB is 4:2:2:1, totaling 10 portions.

[0191] The additives include leveling agents and polymerization inhibitors.

[0192] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0193] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.5 portions.

[0194] The nano black paste comprises the following components by weight percentage:

[0195] DPGDA, 55%;

[0196] PET3A, 15%;

[0197] Carbon black, 25%;

[0198] BASF efka 4310, 5%.

[0199] The preparation of the above-mentioned nano black paste includes the following steps:

[0200] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0201] The preparation of the above inkjet material includes the following steps:

[0202] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano-black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained. This inkjet material is a UV-LED-curable black inkjet material that can be directly printed on white character ink blocks.

[0203] Comparative Example 1

[0204] The only difference between Comparative Example 1 and Example 1 is that the photothermal dual-curing resin used in Comparative Example 1 is EBECRYL*4396.

[0205] An inkjet material comprising the following raw materials in parts by weight:

[0206] Photoinitiator, 9 parts;

[0207] UV monomer, 66.7 parts;

[0208] Oligomer, 18 parts;

[0209] Additives, 0.3 parts;

[0210] Nano black paste, 6 parts.

[0211] UV monomers include ACMO, 4-HBA, and HDDA.

[0212] The weight ratio of ACMO:4-HBA:HDDA was 15:16.7:35, totaling 66.7 parts.

[0213] Oligomers include photothermal dual-curing resins and light-curing resins.

[0214] The photothermal dual-curing resin is EBECRYL*4396, and the photocuring resin is Genomer*2235.

[0215] Among them, EBECRYL*4396:Genomer*2235 = 10:8, totaling 18 copies.

[0216] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0217] Among them, TPO:819:ITX:EDB = 4:2:2:1, totaling 9 portions.

[0218] The additives include leveling agents and polymerization inhibitors.

[0219] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0220] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.3 portions.

[0221] The nano black paste comprises the following components by weight percentage:

[0222] DPGDA, 55%;

[0223] PET3A, 15%;

[0224] Carbon black, 25%;

[0225] BASF efka 4310, 5%.

[0226] The preparation of the above-mentioned nano black paste includes the following steps:

[0227] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0228] The preparation of the above inkjet material includes the following steps:

[0229] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained.

[0230] Comparative Example 2

[0231] The only difference between Comparative Example 2 and Example 1 is that the photothermal dual-curing resin used in Comparative Example 2 is EBECRYL*4397.

[0232] An inkjet material comprising the following raw materials in parts by weight:

[0233] Photoinitiator, 9 parts;

[0234] UV monomer, 66.7 parts;

[0235] Oligomer, 18 parts;

[0236] Additives, 0.3 parts;

[0237] Nano black paste, 6 parts.

[0238] UV monomers include ACMO, 4-HBA, and HDDA.

[0239] The weight ratio of ACMO:4-HBA:HDDA was 15:16.7:35, totaling 66.7 parts.

[0240] Oligomers include photothermal dual-curing resins and light-curing resins.

[0241] The photothermal dual-curing resin is EBECRYL*4397, and the photocuring resin is Genomer*2235.

[0242] Among them, EBECRYL*4397:Genomer*2235 = 10:8, totaling 18 copies.

[0243] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0244] Among them, TPO:819:ITX:EDB = 4:2:2:1, totaling 9 portions.

[0245] The additives include leveling agents and polymerization inhibitors.

[0246] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0247] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.3 portions.

[0248] The nano black paste comprises the following components by weight percentage:

[0249] DPGDA, 55%;

[0250] PET3A, 15%;

[0251] Carbon black, 25%;

[0252] BASF efka 4310, 5%.

[0253] The preparation of the above-mentioned nano black paste includes the following steps:

[0254] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0255] The preparation of the above inkjet material includes the following steps:

[0256] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained.

[0257] Comparative Example 3

[0258] The only difference between Comparative Example 3 and Example 3 is that the photocurable resin used in Comparative Example 3 is EBECRYL*3105.

[0259] An inkjet material comprising the following raw materials in parts by weight:

[0260] Photoinitiator, 9 parts;

[0261] UV monomer, 66.7 parts;

[0262] Oligomer, 18 parts;

[0263] Additives, 0.3 parts;

[0264] Nano black paste, 6 parts.

[0265] UV monomers include ACMO, 4-HBA, and HDDA.

[0266] Among them, ACMO:4-HBA:HDDA = 15:16.7:35, totaling 66.7 copies.

[0267] The oligomer contains thermosetting resin and photocuring resin.

[0268] The thermosetting resin is Txiene BI 7981, and the photocuring resin is EBECRYL*3105.

[0269] Among them, Txiene BI 7981:EBECRYL*3105 = 10:8, totaling 18 copies.

[0270] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0271] Among them, TPO:819:ITX:EDB = 4:2:2:1, totaling 9 portions.

[0272] The additives include leveling agents and polymerization inhibitors.

[0273] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0274] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.3 portions.

[0275] The nano black paste comprises the following components by weight percentage:

[0276] DPGDA, 55%;

[0277] PET3A, 15%;

[0278] Carbon black, 25%;

[0279] BASF efka 4310, 5%.

[0280] The preparation of the above-mentioned nano black paste includes the following steps:

[0281] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0282] The preparation of the above inkjet material includes the following steps:

[0283] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained.

[0284] Comparative Example 4

[0285] The only difference between Comparative Example 4 and Example 1 is that the monofunctional monomer in Comparative Example 4 uses LA instead of ACMO in Example 1.

[0286] An inkjet material comprising the following raw materials in parts by weight:

[0287] Photoinitiator, 9 parts;

[0288] UV monomer, 66.7 parts;

[0289] Oligomer, 18 parts;

[0290] Additives, 0.3 parts;

[0291] Nano black paste, 6 parts.

[0292] UV monomers include LA, 4-HBA, and HDDA.

[0293] The weight ratio of LA:4-HBA:HDDA is 15:16.7:35, totaling 66.7 parts.

[0294] Oligomers include photothermal dual-curing resins and light-curing resins.

[0295] The photothermal dual-curing resin is EBECRYL*4250, and the photocuring resin is Genomer*2235.

[0296] Among them, EBECRYL*4250:Genomer*2235=10:8, totaling 18 copies.

[0297] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0298] Among them, TPO:819:ITX:EDB = 4:2:2:1, totaling 9 portions.

[0299] The additives include leveling agents and polymerization inhibitors.

[0300] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0301] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.3 portions.

[0302] The nano black paste comprises the following components by weight percentage:

[0303] DPGDA, 55%;

[0304] PET3A, 15%;

[0305] Carbon black, 25%;

[0306] BASF efka 4310, 5%.

[0307] The preparation of the above-mentioned nano black paste includes the following steps:

[0308] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0309] The preparation of the above inkjet material includes the following steps:

[0310] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained.

[0311] Comparative Example 5

[0312] The only difference between Comparative Example 5 and Example 1 is that the monofunctional monomer in Comparative Example 5 uses IDA instead of ACMO in Example 1.

[0313] An inkjet material comprising the following raw materials in parts by weight:

[0314] Photoinitiator, 9 parts;

[0315] UV monomer, 66.7 parts;

[0316] Oligomer, 18 parts;

[0317] Additives, 0.3 parts;

[0318] Nano black paste, 6 parts.

[0319] UV monomers include IDA, 4-HBA, and HDDA.

[0320] The weight ratio of IDA:4-HBA:HDDA is 15:16.7:35, totaling 66.7 parts.

[0321] Oligomers include photothermal dual-curing resins and light-curing resins.

[0322] The photothermal dual-curing resin is EBECRYL*4250, and the photocuring resin is Genomer*2235.

[0323] Among them, EBECRYL*4250:Genomer*2235=10:8, totaling 18 copies.

[0324] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0325] Among them, TPO:819:ITX:EDB = 4:2:2:1, totaling 9 portions.

[0326] The additives include leveling agents and polymerization inhibitors.

[0327] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0328] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.3 portions.

[0329] The nano black paste comprises the following components by weight percentage:

[0330] DPGDA, 55%;

[0331] PET3A, 15%;

[0332] Carbon black, 25%;

[0333] BASF efka 4310, 5%.

[0334] The preparation of the above-mentioned nano black paste includes the following steps:

[0335] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0336] The preparation of the above inkjet material includes the following steps:

[0337] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained.

[0338] Comparative Example 6

[0339] The only difference between Comparative Example 6 and Example 3 is that the photoinitiator in Comparative Example 6 is in the weight ratio of TPO:819:ITX:EDB = 3:2.5:2.5:1.

[0340] An inkjet material comprising the following raw materials in parts by weight:

[0341] Photoinitiator, 9 parts;

[0342] UV monomer, 66.7 parts;

[0343] Oligomer, 18 parts;

[0344] Additives, 0.3 parts;

[0345] Nano black paste, 6 parts.

[0346] UV monomers include ACMO, 4-HBA, and HDDA.

[0347] Among them, ACMO:4-HBA:HDDA = 15:16.7:35, totaling 66.7 copies.

[0348] The oligomer contains thermosetting resin and photocuring resin.

[0349] The thermosetting resin is Txiene BI 7981, and the photocuring resin is Genomer*2235.

[0350] Among them, Txiene BI 7981: Genomer*2235 = 10:8, totaling 18 copies.

[0351] Among them, photoinitiators include TPO, 819, ITX, and EDB.

[0352] The ratio of TPO:819:ITX:EDB is 3:2.5:2.5:1, totaling 9 portions.

[0353] The additives include leveling agents and polymerization inhibitors.

[0354] The leveling agent is TEGO 425, and the polymerization inhibitor is Rahn's Genorad*16.

[0355] The ratio of TEGO 425 to Genorad*16 is 0.05 to 0.25, totaling 0.3 portions.

[0356] The nano black paste comprises the following components by weight percentage:

[0357] DPGDA, 55%;

[0358] PET3A, 15%;

[0359] Carbon black, 25%;

[0360] BASF efka 4310, 5%.

[0361] The preparation of the above-mentioned nano black paste includes the following steps:

[0362] According to the formula, the acrylic monomer and dispersant are mixed evenly, then carbon black is added, and then the mixture is stirred at high speed to disperse evenly. Finally, the mixture is added to a sand mill and circulated and ground until D95≤700nm to obtain nano black paste.

[0363] The preparation of the above inkjet material includes the following steps:

[0364] According to the formula, the oligomer, UV monomer, photoinitiator, and additives are mixed and stirred at high speed (1000-1200 rpm) for 1.5-2 hours under light-protected conditions to obtain a transparent oil. Finally, the previously obtained nano black paste is mixed with it and stirred at 600-800 rpm for 1 hour. After filtration through a 1μm filter, the inkjet material is obtained.

[0365] Performance testing:

[0366] The viscosity and surface tension of the UV inkjet inks obtained in Examples 1-5 and Comparative Examples 1-6 were tested.

[0367] Using a Konica printhead (KM1024i, printhead temperature 50℃) and a 395nm wavelength LED-UV lamp, the ink was sprayed onto a PCB character white ink pad (uncured) to form QR codes or other patterns, followed by heat curing (heat curing temperature 150℃, time 1 hour). The adhesion and surface free energy of the ink pad were tested.

[0368] The specific tests are as follows:

[0369] 1. Viscosity: GB / T 10247-2008 Viscosity Measurement Method. A DV2T rotational viscometer was used for testing.

[0370] 2. Surface tension: GB / T 22237-2008 Determination of surface tension of surfactants. Platinum plate method.

[0371] 3. Pencil hardness: GB / T 6739-2006 Pencil method for determining the hardness of paint and varnish film.

[0372] 4. Solderability: Tested according to standard IPC-SM-840D 3.7.2. Immersion temperature 288℃, 10 seconds, 3 times.

[0373] 5. Adhesion: GB / T 9286-2021 Cross-cut adhesion test for paint and varnish films. (100-cross cut test)

[0374] Table 1 Test Results

[0375]

[0376]

[0377] As shown in Table 1, the inks of Examples 1, 2, 3 and Comparative Examples 4, 5 exhibit good adhesion and hardness after curing.

[0378] Comparing Example 1 and Example 2, it can be seen that the flexibility and adhesion properties of the photocurable resins Genomer*2235 and EBECRYL*3105 are similar.

[0379] Comparing Examples 1 and 2 with Example 3, the photothermal dual-curing resin EBECRYL*4250 used in Examples 1 and 2 is a polyurethane acrylate with isocyanate groups, an -NCO content of approximately 5%, a carbon-carbon double bond functionality of approximately 3.4, and a viscosity of approximately 2000 cp at 25°C. The thermosetting resin used in Example 3 is BI 7981, an isocyanate with HDI as its matrix, an -NCO content of approximately 10.2%, and a viscosity of approximately 300–900 cp at 25°C.

[0380] Regarding hardness, Example 3 was 1H lower than Examples 1 and 2. This indicates that the degree of crosslinking is higher when using a photothermal dual-curing resin than when using a thermosetting resin. This is because the photothermal dual-curing resin can undergo both thermosetting and photocuring reactions, while isocyanate thermosetting resins can only undergo thermosetting reactions.

[0381] Comparing Comparative Examples 1 and 2 with Example 1, Comparative Example 1 used the photothermal dual-curing resin EBECRYL*4396, which is a polyurethane acrylate with isocyanate groups, an -NCO content of approximately 7.5%, a carbon-carbon double bond functionality of 1, and a viscosity of approximately 14,000 cp at 25°C. Comparative Example 2 used the photothermal dual-curing resin EBECRYL*4397, which is a polyurethane acrylate with isocyanate groups, an -NCO content of approximately 6.7%, a carbon-carbon double bond functionality of 1, and a viscosity of approximately 11,000 cp at 25°C. Both resins have higher viscosities and lower carbon-carbon double bond functionality than EBECRYL*4250.

[0382] As shown in Table 1, the viscosity of the inks in Comparative Examples 1 and 2 is significantly higher than that of the ink in Example 1, the degree of crosslinking is reduced, and the adhesion is worse.

[0383] Comparing Comparative Example 3 and Example 3, both used Txiene BI 7981 as the thermosetting resin, undergoing only a thermosetting reaction. However, Comparative Example 3 used EBECRIL*3105, an aromatic difunctional epoxy acrylate with an acid value of 5 mg / kg KOH and a viscosity of approximately 600 cp at 60°C, exhibiting poor reactivity. Example 3 used Genomer*2235, an aliphatic difunctional epoxy acrylate with an acid value of 7 mg / kg KOH and a viscosity of approximately 1100 cp at 25°C, demonstrating better reactivity.

[0384] As shown in Table 1, Comparative Example 3, using EBECRYL*3105, exhibited a slower reaction, insufficient photocuring, and poor curing. High-temperature tin dipping resulted in blistering, and most of the tin was detached during adhesion testing.

[0385] Comparing Comparative Examples 4 and 5 with Example 1, Comparative Example 4 used LA instead of ACMO, and Comparative Example 5 used IDA instead of ACMO. ACMO contains a morpholine ring and has a certain structural rigidity, resulting in a high Tg value (145℃). Extensive use of ACMO in this system (generally not exceeding 20%) can lead to brittleness. Using acrylate monomers with long aliphatic chains can lower the Tg value, increase flexibility, and reduce system hardness. Table 1 shows that the addition of LA and IDA monomers results in lower surface tension, thus reducing the overall surface tension of the system.

[0386] Compared with Comparative Example 3, Comparative Example 6 changed the photoinitiator from TPO:819:ITX:EDB = 4:2:2:1 to TPO:819:ITX:EDB = 3:2.5:2.5:1. Both 819 and ITX are photoinitiators that effectively enhance deep curing.

[0387] Table 1 shows that, compared with Comparative Example 3, the adjustment of the photoinitiator combination enhanced photocuring and slightly improved adhesion, although some parts detached during the adhesion test. It can be seen that EBECRYL*3105 has poor reactivity, and the system's adhesion was not significantly enhanced. High-temperature tin dipping resulted in blistering, and some parts detached during the adhesion test.

[0388] In summary, EBECRYL*4250 paired with Genomer*2235 or EBECRYL*3105 yields the best results. Txiene BI7981 paired with Genomer*2235 shows the second best results. Txiene BI 7981 paired with EBECRYL*3105 exhibits poor curing.

[0389] The results of Examples 4 and 5 are similar to those of Example 1, and are not shown one by one to avoid redundancy.

[0390] The inkjet material of the present invention is a UV-LED curable black inkjet material that can be directly printed on white ink blocks of characters, and the inkjet material of the present invention has excellent flexibility and adhesion.

[0391] The oligomers in the inkjet material of the present invention are one of the key components that enhance flexibility and improve adhesion. Photocurable resins, thermocurable resins and photothermal dual-curable resins are all types of oligomers. After curing, these oligomers form a polymer network structure with good flexibility and adhesion, which enables the inkjet material to maintain its integrity without being easily broken or peeled off.

[0392] In the photothermal dual-curing resin of the inkjet material of this invention, the polyurethane acrylic resin with isocyanate groups is an important component. It can initiate a photocuring reaction through a photoinitiator to form a partially cured polymer network. In the subsequent thermal curing process, the isocyanate groups react with other functional groups to form stronger chemical bonds, further enhancing the adhesion and flexibility of the inkjet material.

[0393] The nano-black pigment in the inkjet material of this invention is the pigment component, possessing a high specific surface area and good dispersibility. This allows the nano-black pigment to be uniformly distributed within the polymer network and interwoven with the polymer chains after curing. This interwoven structure increases the cohesiveness and adhesion of the material, thereby improving the flexibility and adhesion of the inkjet material.

[0394] Furthermore, the isocyanate groups in the photocurable and thermocurable resins react with other functional groups to form stronger chemical bonds. These bonds provide strong interactions at the atomic level, enhancing the material's cohesion and adhesion. After curing, photocurable, thermocurable, and photocurable / thermal-curable resins form a polymer network structure. This network structure, composed of interwoven polymer chains, gives the material high flexibility and strength. The nano-black pigment, as a pigment component, exhibits excellent dispersibility. During curing, the nano-pigment can be uniformly distributed within the polymer network, further increasing the material's cohesion and adhesion.

[0395] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An inkjet material, characterized by: The raw materials include the following parts by weight: a photoinitiator, 7-10 parts, the photoinitiator consisting of 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide, phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide, 2-isopropylthioxanthone and 4-dimethylamino-ethyl benzoate in a weight ratio of 4:2:2:1; a UV monomer, 50-70 parts; an oligomer, 5-20 parts; an auxiliary, 0.05-0.5 parts; a nano black paste, 3-10 parts; The components of the nano black paste include an acrylate monomer, carbon black, and a dispersant, the carbon black includes at least one of Mitsubishi carbon black #850, Mitsubishi carbon black #900, Mitsubishi carbon black #950, Mitsubishi carbon black #960, Mitsubishi carbon black #970, Mitsubishi carbon black #980, Mitsubishi carbon black #1000, Mitsubishi carbon black #2300, Mitsubishi carbon black #2350, Mitsubishi carbon black #2600, and Mitsubishi carbon black #2650; the dispersant includes at least one of BASF efka 4030, BASF efka 4310, BASF efka 4330, BASF efka PX4701, BASF efka PX7701 of BASF, BYKJET-9150, BYKJET-9151, BYKJET-9152 of BYK, and Solsperse 24000, Solsperse 28000, Solsperse 36000, Solsperse 39000 of Lubrizol. 9152, Solsperse 24000, Solsperse 28000, Solsperse 36000, Solsperse 39000 of Lubrizol. The oligomer consists of a light-heat dual-curing resin EBECRYL*4250 and a light-curing resin EBECRYL*3105, or the oligomer consists of a light-heat dual-curing resin EBECRYL*4250 and a light-curing resin Genomer*2235, or the oligomer consists of a heat-curing resin Txiene BI 7981 and a light-curing resin Genomer*2235.

2. The inkjet material according to claim 1, characterized in that: The UV monomer includes at least one of a monofunctional monomer and a bifunctional monomer; the monofunctional monomer includes at least one of a vinyl active monomer, a hydroxyl-bearing acrylate monomer and a fatty long-chain-bearing acrylate monomer; the bifunctional monomer includes at least one of 1,6-hexanediol diacrylate, tripropyleneglycol diacrylate, dipropylene glycol diacrylate, neopentyl glycol diacrylate and tetraethylene glycol diacrylate.

3. A method of preparing an inkjet material as claimed in any one of claims 1 or 2, characterised by: The method includes the following steps: mixing the photoinitiator, the UV monomer, the oligomer and the auxiliary, stirring in the dark to obtain a transparent oil; mixing the transparent oil with the nano black paste, stirring and filtering to obtain the inkjet material.

4. A UV-curable jet ink, characterized by: The method includes using the inkjet material according to any one of claims 1 or 2.

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