UV-cured pigment type inkjet ink
UV cured ink prepared by using materials such as non-aqueous dispersant FSG100 and UV resin, the shortcomings of existing inks in adhesion and durability are solved, and the effects of high adhesion and durability are achieved, and the needs of commercial applications are met.
Patent Information
- Application Number
- CN202510058699.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2025-03-14
AI Technical Summary
Existing UV curing inks have shortcomings in adhesion and durability, which is difficult to meet the needs of commercial applications for high adhesion and durability.
The non-aqueous dispersant FSG100 is used as the key component of the formula. By combining it with carbon black, UV resin and other materials, excellent slurry SCG100 is prepared, and mixed with components such as double-official UV monomer and multi-official UV monomer to form UV curing ink.
It significantly improves the adhesion and durability of the printing ink, can achieve good results in the open cover performance test and adhesion test, reduces defective rate and material consumption, and improves production efficiency.
Smart Images
Figure CN119613613A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of printing inks, and in particular discloses a UV-curable pigment-type inkjet ink. Background Art
[0002] The emergence of UV curing technology is to meet the needs of the modern printing industry for efficient, environmentally friendly and high-quality products. Although traditional printing technologies such as offset printing and screen printing have occupied a certain share in the market, they have certain limitations in terms of flexibility, production efficiency and environmental protection. With the rapid development of inkjet printing technology, UV curing ink has gradually become an important part of the digital printing field.
[0003] The advantage of inkjet printing technology is that it can generate prints directly from digital files, reducing the plate-making time and cost in the traditional printing process. The introduction of UV-curable ink has significantly improved the production efficiency and printing quality of inkjet printing. UV-curable ink cures quickly through ultraviolet light, avoiding the shortcomings of traditional inks such as long drying time and high environmental requirements.
[0004] The development of UV curing ink can be traced back to the 1970s, when it was mainly used in industrial coating and printing. With the advancement of digital inkjet printing technology, UV curing ink has gradually entered the fields of advertising, packaging and label printing. In the 1990s, with the maturity of inkjet printer technology, UV curing ink began to be widely used.
[0005] After entering the 21st century, increasingly stringent environmental regulations and the market demand for low VOC (volatile organic compound) inks have driven the further development of UV curing inks. Many ink manufacturers have begun to focus on the environmental protection and safety of their products, while improving the performance of inks to meet customer needs. Today, UV curing pigment solvent-based inkjet inks have become an important part of the digital printing industry and are widely used for high-quality printing on various substrates.
[0006] The quality requirements for commercial UV inkjet inks include fast curing, high adhesion, and durability. The test methods used include adhesion tests, such as the 3M tape peeling test method. This method refers to some operations of the national standard GB / T 2792-2014 and is a common test method in the industry. Better adhesion can significantly reduce the defective rate, reduce material consumption, and reduce production costs. Summary of the invention
[0007] In order to solve the problems existing in the prior art and provide more ink formulas with high adhesion and durability, the first aspect of the present invention provides a method for preparing a non-aqueous dispersant FSG100, comprising: Step 1: Add 1,6-hexanediol diacrylate, 3-aminopropyl-morpholine and vinyl acrylate into alcohol to obtain a mixed solution; Step 2: Add an aqueous solution of potassium persulfate to the mixed solution of step 1, and polymerize under temperature control to obtain a non-aqueous dispersant.
[0008] In some specific embodiments of the first aspect, the alcohol in step 1 is selected from any one of methanol, ethanol, and isopropanol.
[0009] In some specific embodiments of the first aspect, in the step, 25-30 g of 1,6-hexanediol diacrylate, 15-20 g of 3-aminopropyl-morpholine, and 8-12 g of vinyl acrylate are added to 1 L of alcohol.
[0010] In some specific embodiments of the first aspect, in step 2, 8-12 g of potassium persulfate is added to every 1 L of alcohol solution. In some specific embodiments of the first aspect, the temperature control temperature in step 2 is 60-80°C.
[0011] The second aspect of the present invention provides a non-aqueous dispersant FSG100 obtained by any preparation method embodiment of the first aspect.
[0012] The third aspect of the present invention proposes a color paste SCG100 for preparing UV curing ink, comprising 10 to 20 parts by mass of carbon black, 10 to 20 parts by mass of alcohol, 8 to 12 parts by mass of UV resin, and 15 to 25 parts by mass of the non-aqueous dispersant FSG100 according to claim 4. The fineness of the color paste SCG100 is D90 = 1.7 to 1.8 microns, and D50 = 1.2 to 1.3 microns.
[0013] The fourth aspect of the present invention provides a method for preparing the color paste SCG100 described in the third aspect, comprising: S1: mixing carbon black, ethanol, UV resin, and the non-aqueous dispersant FSG100 described in the second aspect to obtain a preliminary mixture; S2: Grind the preliminary mixture to a fineness value of D90 = 1.755 microns and D50 = 1.255 microns.
[0014] A fifth aspect of the present invention provides a method for preparing UV curable ink, comprising: Step a: mixing the color paste SCG100 mentioned in any embodiment of the third aspect with a difunctional UV monomer, a multifunctional UV monomer, a hyperbranched acrylic resin, an initiator, an alcohol, and a leveling agent to obtain a crude ink; Step b: removing impurities from the crude ink obtained in step a to obtain UV curing ink.
[0015] In some specific embodiments of the fifth aspect, the difunctional UV monomer in step a is selected from one or a combination of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, and tripropylene glycol diacrylate, the multifunctional UV monomer is selected from one or a combination of trimethylolpropane triacrylate and pentaerythritol triacrylate, the hyperbranched acrylic resin is selected from 6361-100, the initiator includes ITX and TPO, the alcohol is selected from one or a mixture of methanol, ethanol, and isopropanol, and the leveling agent includes DC27 and BYK3500.
[0016] In some specific embodiments of the fifth aspect, in the step a, the feeding amount, in parts by mass, is 10 to 30 parts by mass of the color paste SCG100 of any one of claims 5 or 6, 1 to 20 parts by mass of a difunctional UV monomer, 1 to 20 parts by mass of a multifunctional UV monomer, 1 to 20 parts by mass of a hyperbranched acrylic resin, 2 to 10 parts by mass of an initiator, 21 to 60 parts by mass of an alcohol, and 0.2 to 1.0 parts by mass of a leveling agent.
[0017] In some specific embodiments of the fifth aspect, in the step a, the specific feeding amount includes: 18 to 22 parts by mass of the color paste SCG100 according to any one of claims 5 or 6, and 8 to 12 parts by mass of the difunctional UV monomer 1,6-hexanediol diacrylate, and 8 to 12 parts by mass of trimethylolpropane triacrylate, and 1 to 20 parts by mass of hyperbranched acrylic resin 6361-100, and 1.5 to 2.5 parts by mass of initiator ITX, and 2.5 to 3.5 parts by mass of initiator TPO, and 35 to 45 parts by mass of ethanol, and 4 to 6 parts by mass of isopropanol, and 0.15 to 0.25 parts by mass of leveling agent DC27, and 0.25 to 0.35 parts by mass of leveling agent BYK3500; In some specific embodiments of the fifth aspect, in the step a, the specific feeding amount includes: 18 to 22 parts by mass of the color paste SCG100 according to any one of claims 5 or 6, and 8 to 12 parts by mass of dipropylene glycol diacrylate, and 8 to 12 parts by mass of tetraol triacrylate, and 8 to 12 parts by mass of hyperbranched acrylic resin 6361-100, and 1.5 to 2.5 parts by mass of initiator ITX, and 2.5 to 3.5 parts by mass of initiator TPO, and 35 to 45 parts by mass of ethanol, and 4 to 6 parts by mass of isopropanol, and 0.15 to 0.25 parts by mass of leveling agent DC27, and 0.25 to 0.35 parts by mass of leveling agent BYK3500; In some specific embodiments of the fifth aspect, in the step a, the specific feeding amount includes: 18 to 22 parts by mass of the color paste SCG100 according to any one of claims 5 or 6, and 8 to 12 parts by mass of tripropylene glycol diacrylate, and 8 to 12 parts by mass of trimethylolpropane triacrylate, and 8 to 12 parts by mass of hyperbranched acrylic resin 6361-100, and 1.5 to 2.5 parts by mass of initiator ITX, and 2.5 to 3.5 parts by mass of initiator TPO, and 35 to 45 parts by mass of ethanol, and 4 to 6 parts by mass of isopropanol, and 0.15 to 0.25 parts by mass of leveling agent DC27, and 0.25 to 0.35 parts by mass of leveling agent BYK3500; Terminology explanation: ⑴Viscosity: inkjet ink qualification standard 1~5 cp (25℃) ⑵Dynamic surface tension: The qualified standard of inkjet ink is 25~40mN / m (25℃, 15us) Correspondence table between names, categories and abbreviations: In the above text of the present invention, regardless of whether the words "about" or "approximately" are used, all the numbers disclosed herein are approximate values. Based on the disclosed numbers, the value of each number may vary by less than ±10% or reasonable differences considered by those skilled in the art, such as ±1%, ±2%, ±3%, ±4% or ±5%.
[0018] In the present invention, normal temperature or room temperature refers to the ambient temperature, which may be 20°C-30°C; in some embodiments, 22°C-28°C; in some embodiments, 24°C-26°C; in some embodiments, 25°C.
[0019] The terms "above", "below", "within" and the like are understood to include the number itself, for example, more than two means ≥ two.
[0020] The term "and / or" should be understood to mean any one of the optional items or a combination of any two or more of the optional items.
[0021] The term "Decap Time" refers to the amount of time that a printer can remain dormant and not print, and then when printing resumes, all characters in the first code are visible and completely legible. For example, if the published decap time is 1 hour, the print is completely legible at the 1 hour test time point. Therefore, the decap time will be at least 1 hour. The actual decap time may exceed 1 hour.
[0022] The term "wt%" stands for mass percentage.
[0023] The term "plurality" means a number of 2 or more, for example, 2, 3, 4 or 5, etc.
[0024] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0025] Advantages of the present invention: The present invention provides a non-aqueous dispersant and a color paste SCG100 prepared by using the non-aqueous dispersant. The color paste SCG100 is used in combination with different UV difunctional monomers, UV multifunctional monomers and UV resins, for example, it is used in combination with 1,6-hexanediol diacrylate HDDA, trimethylolpropane triacrylate TMPTA and hyperbranched acrylic resin 6361-100, or it is used in combination with dipropylene glycol diacrylate DPGDA and pentaerythritol triacrylate PET3A. The printed text achieves good results in a cover opening performance test and an adhesion test. The dispersant is mildly synthesized, low in cost and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 The following is a diagram showing the lid opening performance test of the formula A1 of the present invention; Figure 2 The following is a diagram showing the lid opening performance test of the formula B of the present invention; Figure 3 The adhesion test pattern of the formula A1 of the present invention is shown; Figure 4 The adhesion test pattern of formulation C of the present invention is shown. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field based on the present application belong to the scope of protection of the present application.
[0028] Example 1: Synthesis of FSG100 non-aqueous dispersant 30 g of 1,6-hexanediol diacrylate (HDDA), 18 g of 3-aminopropyl-morpholine and 10 g of vinyl acrylate (EGDMA) were put into a reaction bottle and mixed, and 100 ml of isopropanol was added and stirred evenly.
[0029] Deionized water was added dropwise to 1 g of potassium persulfate (KPS) until the potassium persulfate (KPS) was dissolved, and the potassium persulfate solution was slowly added to the aforementioned isopropanol solution. The solution was stirred by a magnetic rotor and the temperature of the water bath was maintained at 60-80°C. During the water bath process, polymerization occurred. The acrylate groups in 1,6-hexanediol diacrylate (HDDA) and 3-aminopropyl-morpholine were polymerized to form polymer chains. At the same time, the double bonds of vinyl acrylate (EGDMA) led to a cross-linking reaction to form a hyperbranched structure.
[0030] After 1 hour in the water bath, the water bath was removed while stirring with a magnetic rotor, and the reaction mixture was cooled to room temperature and centrifuged. The clear liquid included unreacted monomers and by-products, and the clear liquid was removed by precipitation or filtration to obtain a precipitate, i.e., a crude product.
[0031] The crude product was washed with ethanol for 10 g × 3 times to remove the residual monomers and initiators. After each washing, the precipitate was centrifuged at 500 rpm to ensure the effective removal of the detergent. The washed product was placed in a vacuum drying oven at a set temperature of 40-60°C for 12-24 hours. After drying, the final FSG100 non-aqueous pigment dispersant was obtained.
[0032] Example 2: Preparation of SCG100 color paste 15g of carbon black, 15g of ethanol, 10g of UV resin 6361-100, and 20g of dispersant (FSG100) were mixed, and the mixture was initially stirred at 300rpm using a stirrer to allow the pigment to fully contact the solvent to obtain a preliminarily mixed color slurry. The preliminarily mixed pigment slurry was transferred to a bead mill and ground for 2h. After grinding, the pigment paste SCG100 was obtained, and 3~5g of the sample was taken for particle size analysis to detect the fineness and dispersibility of the pigment paste, with D90=1.755 microns and D50=1.255 microns as the qualified standards.
[0033] Example 3: Preparation of Formulations A1 to A3 Inkjet Printing Inks Mix 10~30g of pigment paste SCG100 with 1~20g of difunctional UV monomer (1,6-hexanediol diacrylate, HDDA), 1~20g of multifunctional UV monomer (trimethylolpropane triacrylate, TMPTA), 1~20g of hyperbranched acrylic resin 6361-100, 1~5g of initiator ITX, 1~5g of initiator TPO, 20~50g of ethanol, 1~10g of isopropanol, 0.1~0.5g of leveling agent DC27, 0.1~0.5g of leveling agent BYK3500. The mixture was fully stirred for 1 hour using a high-speed stirrer at a rotation speed, and passed through a 5-micron filter element to remove incompletely dispersed pigment particles and impurities to ensure the purity and stability of the pigment paste. Groups A1 to A3 were produced, and the feed ratios were shown in Table 1.
[0034] Table 1 Preparation and feeding amount of A1~A3 inkjet printing ink of the present invention Example 3: Preparation of inkjet inks of Formulations A4-A5, B and C As shown in Table 2, 20g of pigment paste (SCG100 or Astrong UB054), 10g of difunctional UV monomer (HDDA, DPGDA or TPGDA), 10g of UV multifunctional monomer (PET3A or TMPTA), 10g of UV resin (6361-100 or 6363), 2g of initiator ITX, 3g of initiator TPO, 39.5g of ethanol, 5g of isopropanol, 0.2g of leveling agent DC27, 0.3g of leveling agent BYK3500 were mixed. The mixture was stirred thoroughly for 1 hour using a high-speed stirrer at a rotation speed. The mixture was passed through a 5-micron filter element to remove incompletely dispersed pigment particles and impurities to ensure the purity and stability of the pigment paste. Formulas A4 to A5 were prepared. The material ratios of B and C were shown in Table 21.
[0035] Table 2 Feeding of formula A4~A5, formula B and formula C Example 4: Viscosity (25°C), dynamic surface tension (25°C, 15us), adhesion performance test, and lid opening performance test. Table 3 Viscosity and dynamic surface tension test ⑴ Inkjet ink viscosity: qualified standard 1~5 cp (25℃).
[0036] ⑵Dynamic surface tension of inkjet ink: qualified standard 25~40mN / m (25℃, 15us).
[0037] Decapping performance of inkjet inks with different raw material formulas The decapping performance test of the inks of formula A1~A5 and the inks of formula B and C was carried out: the inkjet printer was set to the same parameters, the UV solvent-based inkjet ink was injected into the ink cartridge, and the ink cartridge was installed on the inkjet printer. The pattern to be printed was edited on the inkjet printer, and the image was used as the image before the test.
[0038] Then, the printer is set in standby mode, and the inkjet ink at the ink cartridge nozzle is exposed to the air. After standing by for 1 hour, the printing image is started as the post-test image.
[0039] The qualification standard is: the printed image is clear and complete, without distortion, missing frames or missing corners.
[0040] Compare the clarity of the image before and after the test, as shown in Table 4: Table 4 Test results of opening performance of formula A1~A5, formula B and formula C In the uncapping performance test of the inkjet printing inks A1 to A5 of the present invention, when the inkjet printer is in standby mode and has been on standby for 1 hour, the printed image is clear and complete without distortion, missing frames or missing corners. However, when the inkjet printers of formulas B and C are in standby mode and the ink cartridge nozzles are exposed to the air for 1 hour, the printed images have missing corners and are unclear, complete and have missing frames.
[0041] Adhesion performance test of inkjet inks with different raw material formulas Adhesion performance test of formula A1~A5 and formula B, C: 3M tape peeling test method, referring to some operations of national standard GB / T 2792-2014, is a common test method in the industry. Specific content: Use 3M600 special tape to stick to the three areas of the silk screen area (character area, logo area and inkjet area), requiring the sticking area to cover as much silk screen content as possible, and the tape must not have bubbles, wrinkles, or tilt. Then use a 2KG roller to roll the tape in the three areas back and forth 30 times at a uniform speed (300mm / min); then lift one end of the tape and quickly pull it up in the opposite direction at 90° to the surface to be tested. The same method is used for 5 tests, and a new 3M tape is replaced each time, and each test is conducted at the same position.
[0042] After the 3M tape test, the image is rated according to the GB / T9286-88 standard and is divided into 6 levels (0~5), with 0 being the best and 5 being the worst.
[0043] Table 5 Test results of printing image performance of different formulations A1~A5 and formulations B and C In the adhesion performance test of the inkjet printing inks A1 to A5 of the present invention, after the 3M tape was peeled off 5 times, the image was lost, but the loss rate was less than 5%, and the adhesion was good. After the 3M tape of the present invention was peeled off 5 times, the image was found to have obvious loss, and the adhesion was average.
[0044] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims
1. A method for preparing a non-aqueous dispersant FSG100, comprising: Step 1: Add 1,6-hexanediol diacrylate, 3-aminopropyl-morpholine and vinyl acrylate into alcohol to obtain a mixed solution; Step 2: Add an aqueous solution of potassium persulfate to the mixed solution of step 1, and polymerize under temperature control to obtain a non-aqueous dispersant.
2. The method for preparing the non-aqueous dispersant FSG100 according to claim 1, characterized in that: In the step 1, the alcohol is selected from any one of methanol, ethanol and isopropanol, and / or, in the step 1, 25-30 g of 1,6-hexanediol diacrylate, 15-20 g of 3-aminopropyl-morpholine and 8-12 g of vinyl acrylate are added to 1 L of alcohol.
3. The method for preparing the non-aqueous dispersant FSG100 according to any one of claims 1 or 2, characterized in that: In the step 2, 8-12 g of potassium persulfate is added to every 1 L of alcohol solution, and / or the temperature in the step 2 is controlled at 60-80° C.
4. A non-aqueous dispersant FSG100 obtained by the preparation method according to any one of claims 1 to 3.
5. A color paste SCG100 for preparing UV curing ink, characterized in that: It comprises 10 to 20 parts by mass of carbon black, 10 to 20 parts by mass of alcohol, 8 to 12 parts by mass of UV resin, and 15 to 25 parts by mass of the non-aqueous dispersant FSG100 described in claim 4. The fineness of the color paste SCG100 is D90=1.7 to 1.8 microns and D50=1.2 to 1.3 microns.
6. A method for preparing the color paste SCG100 according to claim 5, comprising: S1: mixing carbon black, ethanol, UV resin, and the non-aqueous dispersant FSG100 described in claim 4 to obtain a preliminary mixture; S2: Grind the preliminary mixture to a fineness value of D90 = 1.755 microns and D50 = 1.255 microns.
7. A method for preparing UV curable ink, characterized in that: include, Step a: mixing the color paste SCG100 described in claim 5 with a difunctional UV monomer, a multifunctional UV monomer, a hyperbranched acrylic resin, an initiator, an alcohol, and a leveling agent to obtain a crude ink; Step b: removing impurities from the crude ink obtained in step a to obtain UV curing ink.
8. The method for preparing UV curable ink according to claim 7, characterized in that: In the step a, the difunctional UV monomer is selected from one or a combination of 1,6-hexanediol diacrylate, dipropylene glycol diacrylate, and tripropylene glycol diacrylate, the multifunctional UV monomer is selected from one or a combination of trimethylolpropane triacrylate and pentaerythritol triacrylate, the hyperbranched acrylic resin is selected from 6361-100, the initiator includes ITX and TPO, the alcohol is selected from one or a mixture of methanol, ethanol, and isopropanol, and the leveling agent includes DC27 and BYK3500.
9. The method for preparing UV curable ink according to claim 8, characterized in that: In the step a, the feeding amounts are, by mass, 10 to 30 parts by mass of the color paste SCG100 of any one of claims 5 or 6, 1 to 20 parts by mass of a difunctional UV monomer, 1 to 20 parts by mass of a multifunctional UV monomer, 1 to 20 parts by mass of a hyperbranched acrylic resin, 2 to 10 parts by mass of an initiator, 21 to 60 parts by mass of an alcohol, and 0.2 to 1.0 parts by mass of a leveling agent.
10. The method for preparing the UV curable ink according to any one of claims 8 or 9, characterized in that: In the step a, the specific feeding amount includes: 18-22 parts by weight of the color paste SCG100 according to any one of claims 5 or 6, and 8-12 parts by weight of difunctional UV monomer 1,6-hexanediol diacrylate, and 8-12 parts by weight of trimethylolpropane triacrylate, and 1-20 parts by weight of hyperbranched acrylic resin 6361-100, and 1.5-2.5 parts by weight of initiator ITX, and 2.5-3.5 parts by weight of initiator TPO, and 35-45 parts by weight of ethanol, and 4-6 parts by weight of isopropanol, and 0.15-0.25 parts by weight of leveling agent DC27, and 0.25-0.35 parts by weight of leveling agent BYK3500; Alternatively, in step a, the specific feeding amount includes: 18-22 parts by weight of the color paste SCG100 according to any one of claims 5 or 6, and 8-12 parts by weight of dipropylene glycol diacrylate, and 8-12 parts by weight of tetraol triacrylate, and 8-12 parts by weight of hyperbranched acrylic resin 6361-100, and 1.5-2.5 parts by weight of initiator ITX, and 2.5-3.5 parts by weight of initiator TPO, and 35-45 parts by weight of ethanol, and 4-6 parts by weight of isopropanol, and 0.15-0.25 parts by weight of leveling agent DC27, and 0.25-0.35 parts by weight of leveling agent BYK3500; Alternatively, in step a, the specific feeding amount is: 18 to 22 parts by mass of the color paste SCG100 described in any one of claims 5 or 6, and 8 to 12 parts by mass of tripropylene glycol diacrylate, and 8 to 12 parts by mass of trimethylolpropane triacrylate, and 8 to 12 parts by mass of hyperbranched acrylic resin 6361-100, and 1.5 to 2.5 parts by mass of initiator ITX, and 2.5 to 3.5 parts by mass of initiator TPO, and 35 to 45 parts by mass of ethanol, and 4 to 6 parts by mass of isopropanol, and 0.15 to 0.25 parts by mass of leveling agent DC27, and 0.25 to 0.35 parts by mass of leveling agent BYK3500.