UV photocuring wear-resistant ink and preparation method thereof

Abstract

The invention relates to the technical field of printing ink, and particularly discloses UV light-cured wear-resistant printing ink and a preparation method thereof. The UV light-cured wear-resistant ink comprises the following raw materials in parts by weight: 5-15 parts of color paste; 40 to 60 parts of light-cured resin; 10-20 parts of a wear-resistant additive; 3-10 parts of an additive; 1-5 parts of a photoinitiator; the light-cured resin comprises any one or more of waterborne polyurethane acrylate, organic silicon modified polyurethane acrylate, epoxy resin, organic silicon resin and acrylate resin; the additive comprises polytetrafluoroethylene wax. The ink can be used for ink jet of clothes labels, toothpaste tapes and the like, and has the advantages of being black in blackness, high in brightness, excellent in adhesive force and the like.

Description

Technical Field

[0001] The present application relates to the technical field of inks, and more specifically, to a UV light-curable wear-resistant ink and a preparation method thereof. Background Art

[0002] In the printing materials sector, solvent-based, water-based, and UV inks form three major technology paths. Solvent-based inks pose occupational health risks due to volatile organic compound (VOC) emissions; water-based inks are limited by low drying efficiency, which affects printing precision; and UV inks, with their unique light-curing properties, have demonstrated significant technological breakthroughs.

[0003] Compared to traditional inks, UV inks offer the following advantages: They generate no solvent-based pollutants, making them more environmentally friendly. Furthermore, UV inks offer excellent stability, fast processing speeds, and high production efficiency. The UV curing process also ensures thinner films with excellent performance, thereby reducing raw material consumption and lowering costs. Consequently, UV inks have garnered significant attention in recent years and have become a high-value-added ink product on the market.

[0004] However, UV ink solidifies before it has time to fully penetrate, leaving the film primarily on the surface of the substrate. The adhesion between the ink and the substrate is weaker than with solvent inks, and adhesion to some substrates needs to be improved. Therefore, further research is needed to determine the wear and scratch resistance of printed products. Summary of the Invention

[0005] In order to improve the wear resistance and scratch resistance of UV ink, the present application provides a UV light-curable wear-resistant ink and a preparation method thereof, which adopts the following technical solutions: In a first aspect, the present application provides a UV light-curable wear-resistant ink comprising the following raw materials in parts by weight: Color paste 5-15 parts; 40-60 parts of light-curing resin; 10-20 parts of wear-resistant additives; 3-10 parts of additives; 1-5 parts of photoinitiator; The light-curable resin includes at least two of waterborne polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin; The additive includes polytetrafluoroethylene wax.

[0006] By adopting the above technical solution, it is preferred to use at least two of water-based polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin as the film-forming substances of the ink. The combination of multiple photocurable resins can utilize the advantages of multiple resins to overcome the shortcomings of a single resin, so that the coating can obtain excellent gloss and adhesion effect, and reduce the occurrence of bottom biting.

[0007] Preferably, polytetrafluoroethylene wax is added to the ink. Polytetrafluoroethylene wax has extremely fine particle size, high slipperiness, light weight and low surface tension. It can migrate to the ink surface during the curing process, thereby effectively reducing the roughness of the ink surface, solving the problem of mutual restriction between the coating hardness and the surface friction coefficient, and can effectively improve the wear resistance and stain resistance of the coating.

[0008] Optionally, the wear-resistant additive includes any one or more of zirconium oxide, silicon dioxide, aluminum oxide, calcium carbonate, and barium sulfate.

[0009] By adopting the above technical solution, zirconium oxide, silicon dioxide, aluminum oxide, calcium carbonate, and barium sulfate all have the advantages of high hardness, easy synthesis, and submicron size. Adding them to ink can effectively increase the ink's hardness, thereby improving the ink's wear and scratch resistance. Furthermore, during the friction process, the wear-resistant additives can penetrate the cracks and pits of the friction surface, thereby reducing the roughness of the friction surface. Furthermore, the nanoparticles rolling on the ink surface can convert sliding friction into rolling friction, further reducing the friction effect of the ink surface.

[0010] Optionally, the silicon dioxide has a flaky structure, and the zirconium oxide and the silicon dioxide form a filler with a multi-dimensional structure.

[0011] By adopting the above technical solution, zirconium oxide is combined with flaky silicon dioxide to obtain a multidimensional structure, which can form a two-dimensional-zero-dimensional multidimensional structure. When the ink surface is subjected to friction, the nanoparticles between the two-dimensional material layers roll, forming a rolling log effect, thereby further reducing the wear resistance of the ink.

[0012] Optionally, the preparation of the filler with a multidimensional structure is as follows: hydroxylated silica is mixed with water to prepare a silica solution, a lanthanum salt solution is added to the silica solution, magnetic stirring is performed, centrifugation is performed, solid matter is retained, the solid matter and carboxylated zirconium oxide are dispersed in deionized water, stirred and dispersed, centrifuged, and solid matter is retained to obtain a filler with a multidimensional structure.

[0013] By adopting the above technical solution, lanthanum salt is used to achieve the bonding between silica and zirconium oxide. The lanthanum salt can increase the number of active functional groups on the surface of the multi-dimensional structure, thereby effectively improving the dispersibility of the filler of the multi-dimensional structure and the interface bonding effect between the filler and the ink, so that the filler can fully fill the ink, so that the ink obtains uniform strength, wear resistance, and scratch resistance.

[0014] Optionally, the wear-resistant additive is a wear-resistant additive modified with a modifier, and the modifier includes any one of BYK-199, BYK-2012, and Tego-755.

[0015] By adopting the above technical solution, BYK-199, BYK-2012, and Tego-755 are wetting dispersants, and preferably a wetting dispersant is used as a modifier, which can wet the surface of the wear-resistant additive to improve the compatibility and dispersion uniformity of the wear-resistant additive with the ink.

[0016] Optionally, the additive further includes lithium magnesium silicate or polyamide wax.

[0017] By adopting the above technical solution, lithium magnesium silicate can expand in water, forming a three-dimensional colloidal structure in the ink. As grinding progresses, the colloid becomes more dispersed, and more three-dimensional structures are formed in the ink, thereby achieving an anti-settling effect. Polyamide wax has a large number of hydroxyl and amide groups, which can form hydrogen bonds to build a three-dimensional network structure, thus achieving an anti-settling effect. The preferred use of lithium magnesium silicate or polyamide wax as an additive allows the color paste and wear-resistant additive to be evenly dispersed in the ink, resulting in excellent adhesion and wear resistance.

[0018] Optionally, the additive further includes polyvinyl alcohol.

[0019] By adopting the above technical solution, polyvinyl alcohol contains a large number of hydroxyl groups on its molecular chain and has good water solubility. When added to the ink, it can be evenly dispersed in the ink and effectively improve the film-forming property, adhesion and solvent resistance of the ink, and promote the adhesion effect of the ink.

[0020] Optionally, the photoinitiator is a cleavage photoinitiator, selected from any one of 1-hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzophenone, 2,4-dihydroxybenzophenone, diphenylacetophenone, α,α-dimethoxy-α-phenylacetophenone, benzoin, benzoin dimethyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether, HHMP, and phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0021] By adopting the above technical solution, the type of photoinitiator is optimized in this application, and the suitable photoinitiator has better compatibility with the photocurable resin, so that the ink can obtain suitable curing strength.

[0022] In a second aspect, the present application provides a method for preparing a UV-curable wear-resistant ink, which adopts the following technical solution: A method for preparing UV light-curable wear-resistant ink comprises the following steps: S1, dissolving a light-curable resin, a wear-resistant additive, an additive, and a photoinitiator in a solvent to obtain a mixed solution; S2. Disperse the UV color paste in the above mixed solution and stir in the dark to obtain a premix; S3. Transfer the premix to a high-speed dispersant and stir at high speed until the pigment particle size is less than 0.45 μm, and then filter out the material to obtain a UV curable ink composition.

[0023] By adopting the above technical solution, the particle size of the ink output is optimized. When the ink particle size is less than 0.45μm, the ink is not easy to clog the nozzle during the spraying process, nor will it react with the cleaning liquid, and is not easy to affect the use.

[0024] Optionally, the speed of the high-speed stirring is 1000-2000 r / min.

[0025] By adopting the above technical solution, the speed of high-speed stirring is optimized. At an appropriate stirring speed, the ink obtains an appropriate particle size and viscosity to improve the adhesion, wear resistance and scratch resistance of the ink.

[0026] In summary, this application has the following beneficial effects: 1. Since the present application preferably adds polytetrafluoroethylene wax to the ink, polytetrafluoroethylene wax has extremely fine particle size, high slipperiness, light weight and low surface tension. It can migrate to the surface of the ink during the curing process, thereby effectively reducing the roughness of the ink surface, solving the problem of mutual restriction between the coating hardness and the surface friction coefficient, and can effectively improve the wear resistance and stain resistance of the coating.

[0027] 2. In this application, lanthanum salt is used to achieve the bonding between silica and zirconium oxide. Lanthanum salt can increase the number of active functional groups on the surface of the multidimensional structure, thereby effectively improving the dispersibility of the filler of the multidimensional structure and the interface bonding effect between the filler and the ink, so that the filler can fully fill the ink, so that the ink has uniform strength, wear resistance, and scratch resistance.

[0028] 3. In this application, lithium magnesium silicate can expand in water, forming a three-dimensional colloidal structure in the ink. As grinding progresses, the colloid becomes more dispersed, and more three-dimensional structures are formed in the ink, thereby achieving an anti-settling effect. Polyamide wax has a large number of hydroxyl and amide groups, which can form hydrogen bonds to construct a three-dimensional network structure, thereby achieving an anti-settling effect. Lithium magnesium silicate or polyamide wax is preferably used as an additive, which can enable the color paste and wear-resistant additives to be evenly dispersed in the ink, so that the ink has excellent adhesion and wear resistance. DETAILED DESCRIPTION

[0029] The present application is further described in detail below with reference to the embodiments.

[0030] Preparation example of filler with multidimensional structure Preparation Example 1 Accurately weigh 4.6 g of adipic acid crystalline powder and 200 mL of anhydrous ethanol to prepare a saturated ethanol solution of adipic acid; accurately weigh 1 g of nano-zirconia powder, place it in a 100 mL four-necked beaker, and add 40 mL of a saturated ethanol solution of adipic acid; magnetically stir and reflux at a constant temperature of 55°C for 1 hour; ultrasonically disperse it in an ice bath to obtain a carboxylated zirconia suspension; dry it in a vacuum oven at 70°C for 14 hours to remove the residual solvent to obtain carboxylated zirconia powder.

[0031] Accurately weigh 2g of flaky silica, place it in a grinding kettle, and add a pre-prepared 2md / L sodium hydroxide aqueous solution; under the protection of inert gas (Ar), perform a 10:1 wet ball milling treatment; control the ball mill speed to 200-250rpm, ball mill for 30-50min, pause for 10min, and then continue ball milling for 24h to obtain a 0.1wt% hydroxylated silica nanosheet mixture.

[0032] A 0.1wt% mixed liquid of hydroxylated silica nanosheets was ultrasonicated in an ice bath for 90 minutes, and a 0.3wt% lanthanum salt solution (including LaCl3, NH4Cl, EDA, and EDTA ammonia solution) was prepared. The mixture was stirred and magnetically stirred for 60 minutes. The mixture was centrifuged and the solid matter was retained. The solid matter and carboxylated zirconium oxide powder were dispersed in deionized water in a mass ratio of 1:1, centrifuged and the solid matter was retained. The mixture was dried to obtain a filler with a multidimensional structure.

[0033] Preparation Example 2 Accurately weigh 4.6 g of adipic acid crystalline powder and 200 mL of anhydrous ethanol to prepare a saturated ethanol solution of adipic acid; accurately weigh 1 g of nano-zirconia powder, place it in a 100 mL four-necked beaker, and add 40 mL of a saturated ethanol solution of adipic acid; magnetically stir and reflux at a constant temperature of 55°C for 1 hour; ultrasonically disperse it in an ice bath to obtain a carboxylated zirconia suspension; dry it in a vacuum oven at 70°C for 14 hours to remove the residual solvent to obtain carboxylated zirconia powder.

[0034] Accurately weigh 2g of flaky silica, place it in a grinding kettle, and add a pre-prepared 2md / L sodium hydroxide aqueous solution; under the protection of inert gas (Ar), perform a 10:1 wet ball milling treatment; control the ball mill speed to 200-250rpm, ball mill for 30-50min, pause for 10min, and then continue ball milling for 24h to obtain a 0.1wt% hydroxylated silica nanosheet mixture.

[0035] A 0.1wt% mixed liquid of hydroxylated silica nanosheets was ultrasonicated in an ice bath for 90 minutes, and a 0.3wt% lanthanum salt solution (including LaCl3, NH4Cl, EDA, and EDTA ammonia solution) was prepared. The mixture was stirred and magnetically stirred for 60 minutes. The mixture was centrifuged and the solid matter was retained. The solid matter and carboxylated zirconium oxide powder were dispersed in deionized water at a mass ratio of 1:2, centrifuged and the solid matter was retained. The mixture was dried to obtain a filler with a multidimensional structure.

[0036] Preparation Example 3 The filler with a multi-dimensional structure prepared in Preparation Example 2 and the dispersant BYK-199 were dispersed in water at a mass ratio of filler to dispersant of 4:1, stirred and dispersed, filtered, and dried to obtain a modified filler. Example

[0037] Examples 1-3 On the one hand, the present application provides a UV light-curing wear-resistant ink, including color paste, light-curing resin, wear-resistant additives, additives, photoinitiator and water. The specific quality is shown in the table below.

[0038] The photocurable resin includes at least two of waterborne polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin.

[0039] In this example, the photocurable resin consists of a 3:1 mass ratio of water-based polyurethane acrylate (Guangdong Xidun New Materials Technology Co., Ltd.) and silicone-modified polyurethane acrylate (YC5016, Jining Tangyi Chemical Co., Ltd.). The colorant is black, the wear-resistant additive is silicon dioxide, and the additives include equal amounts of polyethylene wax, lithium magnesium silicate, and polyvinyl alcohol. The photoinitiator is HHMP (Covestro).

[0040] On the other hand, the present application provides a method for preparing a UV light-curable wear-resistant ink, comprising the following steps: S1, dissolving a light-curable resin, a wear-resistant additive, an additive, and a photoinitiator in a solvent to obtain a mixed solution; S2. Disperse the UV color paste in the above mixed solution and stir in the dark to obtain a premix; S3. The premix is transferred to a high-speed dispersant and stirred at a high speed of 1000 r / min until the pigment particle size is less than 0.45 μm, and then the material is filtered out to obtain a UV curable ink composition.

[0041] Table 1 Composition of Examples 1-3 Weight / kg Example 1 Example 2 Example 3 Color paste 5 10 15 light-curing resin 40 50 60 Wear-resistant additives 10 15 20 additive 3 7 10 Photoinitiator 1 3 5 water 3 5 8 Example

[0042] On the one hand, the present application provides a UV light-curable wear-resistant ink, including color paste, light-curable resin, wear-resistant additives, additives, photoinitiator and water, and the specific quality is the same as that of Example 2.

[0043] The photocurable resin includes at least two of waterborne polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin.

[0044] In this example, the photocurable resin consists of a 3:1 mass ratio of water-based polyurethane acrylate (Guangdong Xidun New Materials Technology Co., Ltd.) and silicone-modified polyurethane acrylate (YC5016, Jining Tangyi Chemical Co., Ltd.). The colorant is black, and the wear-resistant additives are selected from silicon dioxide and zirconium dioxide. The additives include equal amounts of polyethylene wax, lithium magnesium silicate, and polyvinyl alcohol. The photoinitiator is HHMP (Covestro).

[0045] On the other hand, the present application provides a method for preparing a UV light-curable wear-resistant ink, comprising the following steps: S1, dissolving a light-curable resin, a wear-resistant additive, an additive, and a photoinitiator in a solvent to obtain a mixed solution; S2. Disperse the UV color paste in the above mixed solution and stir in the dark to obtain a premix; S3. The premix is transferred to a high-speed dispersant and stirred at a high speed of 1000 r / min until the pigment particle size is less than 0.45 μm, and then the material is filtered out to obtain a UV curable ink composition. Example

[0046] On the one hand, the present application provides a UV light-curable wear-resistant ink, including color paste, light-curable resin, wear-resistant additives, additives, photoinitiator and water, and the specific quality is the same as that of Example 2.

[0047] The photocurable resin includes at least two of waterborne polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin.

[0048] In this example, the photocurable resin consisted of a water-based polyurethane acrylate (from Guangdong Xidun New Materials Technology Co., Ltd.) and a silicone-modified polyurethane acrylate (YC5016 from Jining Tangyi Chemical Co., Ltd.) in a 3:1 mass ratio. The colorant was black, and the wear-resistant additive was selected from the multidimensional filler prepared in Preparation Example 1. The additives included equal amounts of polyethylene wax, lithium magnesium silicate, and polyvinyl alcohol. The photoinitiator was HHMP (from Covestro).

[0049] On the other hand, the present application provides a method for preparing a UV light-curable wear-resistant ink, comprising the following steps: S1, dissolving a light-curable resin, a wear-resistant additive, an additive, and a photoinitiator in a solvent to obtain a mixed solution; S2. Disperse the UV color paste in the above mixed solution and stir in the dark to obtain a premix; S3. The premix is transferred to a high-speed dispersant and stirred at a high speed of 1000 r / min until the pigment particle size is less than 0.45 μm, and then the material is filtered out to obtain a UV curable ink composition.

[0050] Example 6 On the one hand, the present application provides a UV light-curable wear-resistant ink, including color paste, light-curable resin, wear-resistant additives, additives, photoinitiator and water, and the specific quality is the same as that of Example 2.

[0051] The photocurable resin includes at least two of waterborne polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin.

[0052] In this example, the photocurable resin consisted of water-based polyurethane acrylate (Guangdong Xidun New Materials Technology Co., Ltd.) and silicone-modified polyurethane acrylate (YC5016, Jining Tangyi Chemical Co., Ltd.) in a 3:1 mass ratio. The colorant was black, and the wear-resistant additive was selected from the multidimensional filler prepared in Preparation Example 2. The additives included equal amounts of polyethylene wax, lithium magnesium silicate, and polyvinyl alcohol. The photoinitiator was HHMP (Covestro).

[0053] On the other hand, the present application provides a method for preparing a UV light-curable wear-resistant ink, comprising the following steps: S1, dissolving a light-curable resin, a wear-resistant additive, an additive, and a photoinitiator in a solvent to obtain a mixed solution; S2. Disperse the UV color paste in the above mixed solution and stir in the dark to obtain a premix; S3. The premix is transferred to a high-speed dispersant and stirred at a high speed of 1000 r / min until the pigment particle size is less than 0.45 μm, and then the material is filtered out to obtain a UV curable ink composition.

[0054] Example 7 On the one hand, the present application provides a UV light-curable wear-resistant ink, including color paste, light-curable resin, wear-resistant additives, additives, photoinitiator and water, and the specific quality is the same as that of Example 2.

[0055] The photocurable resin includes at least two of waterborne polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin.

[0056] In this example, the photocurable resin consisted of a water-based polyurethane acrylate (from Guangdong Xidun New Materials Technology Co., Ltd.) and a silicone-modified polyurethane acrylate (YC5016 from Jining Tangyi Chemical Co., Ltd.) in a 3:1 mass ratio. The colorant was black, and the wear-resistant additive was selected from the multidimensional filler prepared in Preparation Example 3. The additives included equal amounts of polyethylene wax, lithium magnesium silicate, and polyvinyl alcohol. The photoinitiator was HHMP (from Covestro).

[0057] On the other hand, the present application provides a method for preparing a UV light-curable wear-resistant ink, comprising the following steps: S1, dissolving a light-curable resin, a wear-resistant additive, an additive, and a photoinitiator in a solvent to obtain a mixed solution; S2. Disperse the UV color paste in the above mixed solution and stir in the dark to obtain a premix; S3. The premix is transferred to a high-speed dispersant and stirred at a high speed of 1000 r / min until the pigment particle size is less than 0.45 μm, and then the material is filtered out to obtain a UV curable ink composition.

[0058] Example 8 On the one hand, the present application provides a UV light-curable wear-resistant ink, including color paste, light-curable resin, wear-resistant additives, additives, photoinitiator and water, and the specific quality is the same as that of Example 2.

[0059] The photocurable resin includes at least two of waterborne polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin.

[0060] In this example, the photocurable resin consisted of a water-based polyurethane acrylate (from Guangdong Xidun New Materials Technology Co., Ltd.) and a silicone-modified polyurethane acrylate (YC5016 from Jining Tangyi Chemical Co., Ltd.) in a 3:1 mass ratio. The colorant was black, and the wear-resistant additive was selected from the multidimensional filler prepared in Preparation Example 3. The additives included equal amounts of polyethylene wax, lithium magnesium silicate, and polyvinyl alcohol. The photoinitiator was HHMP (from Covestro).

[0061] On the other hand, the present application provides a method for preparing a UV light-curable wear-resistant ink, comprising the following steps: S1, dissolving a light-curable resin, a wear-resistant additive, an additive, and a photoinitiator in a solvent to obtain a mixed solution; S2. Disperse the UV color paste in the above mixed solution and stir in the dark to obtain a premix; S3. The premix is transferred to a high-speed dispersant and stirred at a high speed of 1500 r / min until the pigment particle size is less than 0.45 μm, and then the material is filtered out to obtain a UV curable ink composition.

[0062] Example 9 On the one hand, the present application provides a UV light-curable wear-resistant ink, including color paste, light-curable resin, wear-resistant additives, additives, photoinitiator and water, and the specific quality is the same as that of Example 2.

[0063] The photocurable resin includes at least two of waterborne polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin.

[0064] In this example, the photocurable resin consisted of a water-based polyurethane acrylate (from Guangdong Xidun New Materials Technology Co., Ltd.) and a silicone-modified polyurethane acrylate (YC5016 from Jining Tangyi Chemical Co., Ltd.) in a 3:1 mass ratio. The colorant was black, and the wear-resistant additive was selected from the multidimensional filler prepared in Preparation Example 3. The additives included equal amounts of polyethylene wax, lithium magnesium silicate, and polyvinyl alcohol. The photoinitiator was HHMP (from Covestro).

[0065] On the other hand, the present application provides a method for preparing a UV light-curable wear-resistant ink, comprising the following steps: S1, dissolving a light-curable resin, a wear-resistant additive, an additive, and a photoinitiator in a solvent to obtain a mixed solution; S2. Disperse the UV color paste in the above mixed solution and stir in the dark to obtain a premix; S3. The premix is transferred to a high-speed dispersant and stirred at a high speed of 2000 r / min until the pigment particle size is less than 0.45 μm, and then the material is filtered out to obtain a UV curable ink composition.

[0066] Comparative Example 1 The difference between this comparative example and Example 3 is that the photocurable resin in this comparative example only includes waterborne polyurethane acrylate.

[0067] Comparative Example 2 The difference between this comparative example and Example 3 is that polyethylene wax is not added in this comparative example.

[0068] Comparative Example 3 The difference between this comparative example and Example 3 is that polyvinyl alcohol is not added in this comparative example.

[0069] (1) Abrasion resistance test: The inkjet-coated clothing label was used as the test sample. The test sample was fixed on the platform of the CY-850Y abrasion resistance tester. The CS-5 wool felt was placed vertically in the measuring head and about 3mm protruded from the fixture. The sample was loaded with 200g (including the weight of the fixture itself) and moved back and forth at a speed of 2s for a total of 100 tests. The qualified standard was: gloss ≤ 2°, color difference change value ≤ 0.75, and the color of the sample was numerically measured using a CM-700d spectrophotometer. The color before the test was L1, A1, B1, and the color after the test was L2, A2, B2. The color difference Δ = ((L2-L1) 2 + (A2-A1) 2 + (B2-B1) 2 ) 1 / 2 : (2) Adhesion performance test: Spray ink on the surface of the toothpaste tube, dry it, and UV cure it to obtain a proofing strip. Use 20mmx20mm 3M tape to cover the 48um mesh depth of the proofing strip. Place a 10mmx10mm square paper under the sample. After it is firmly adhered, use a constant pulling force to peel off the tape from the plastic surface at 90°. Calculate the number of grids occupied by the remaining ink film and use this as the evaluation standard for adhesion.

[0070] Table 2 Performance test

[0071] Combining the performance test comparison in Table 2, we can find that: By comparing Examples 1-3 with Comparative Examples 1-3, it can be found that the wear resistance and adhesion of the inks prepared in Examples 1-3 are improved, which shows that in this application, water-based polyurethane acrylate and silicone-modified polyurethane acrylate are preferably compounded as photocurable resins, and the advantages of multiple resins are used to overcome the shortcomings of a single resin. The presence of silicone side chains can enable the ink to penetrate to the bottom without affecting the surface, thereby reducing the bottom biting phenomenon of the ink and enabling the coating to obtain excellent gloss and adhesion effect.

[0072] Polytetrafluoroethylene wax has extremely fine particle size, high slipperiness, light weight and low surface tension. It can migrate to the ink surface during the curing process, thereby effectively reducing the roughness of the ink surface, solving the problem of mutual restriction between coating hardness and surface friction coefficient, and can effectively improve the wear resistance and stain resistance of the coating.

[0073] Lithium magnesium silicate swells in water, forming a three-dimensional colloidal structure within the ink. As grinding progresses, the colloid becomes more dispersed, forming more three-dimensional structures within the ink, thus preventing settling. Polyvinyl alcohol, with its high water solubility and numerous hydroxyl groups in its molecular chain, enhances ink adhesion.

[0074] 2. By comparing Examples 4, 5-6, and 2, it can be found that the wear resistance and adhesion of the inks prepared in Examples 4-6 are improved. This indicates that the lanthanum salt in this application achieves a bond between silica and zirconium oxide. The lanthanum salt can increase the number of active functional groups on the surface of the multidimensional structure, thereby effectively improving the dispersibility of the filler in the multidimensional structure and the interfacial bonding effect between the filler and the ink. Combining zirconium oxide with flaky silica to obtain a multidimensional structure can form a two-dimensional to zero-dimensional multidimensional structure. When the ink surface is rubbed, the nanoparticles between the two-dimensional material layers roll, forming a rolling log-like effect, thereby further reducing the wear resistance of the ink.

[0075] 3. By comparing Example 7 with Example 2, it can be found that the wear resistance and adhesion of the ink prepared in Example 7 are improved, which shows that the wetting dispersant used as a modifier in this application can wet the surface of the wear-resistant additive to improve the compatibility and dispersion uniformity of the wear-resistant additive and the ink.

[0076] 4. By comparing Examples 8-9 with Example 2, it can be found that the wear resistance and adhesion of the inks prepared in Examples 8-9 are improved, which shows that the dispersion speed is optimized in this application. At an appropriate dispersion speed, the ink can obtain a smaller particle size, thereby improving the appearance and adhesion effect of the ink.

[0077] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A UV light curing wear-resistant ink, characterized in that: The invention comprises the following raw materials in parts by weight: Color paste 5-15 parts; 40-60 parts of light-curing resin; 10-20 parts of wear-resistant additives; 3-10 parts of additives; 1-5 parts of photoinitiator; The light-curable resin includes at least two of waterborne polyurethane acrylate, silicone-modified polyurethane acrylate, epoxy resin, silicone resin, and acrylate resin; The additive includes polytetrafluoroethylene wax.

2. The UV curable wear-resistant ink according to claim 1, characterized in that: The wear-resistant additives include any one or more of zirconium oxide, silicon dioxide, aluminum oxide, calcium carbonate, and barium sulfate.

3. The UV curable wear-resistant ink according to claim 2, characterized in that: The silicon dioxide has a flaky structure, and the zirconium oxide and the silicon dioxide form a filler with a multi-dimensional structure.

4. The UV curable wear-resistant ink according to claim 3, characterized in that: The preparation of the filler with a multidimensional structure is as follows: hydroxylated silica is mixed with water to prepare a silica solution, a lanthanum salt solution is added to the silica solution, magnetic stirring is performed, centrifugation is performed, solid matter is retained, the solid matter and carboxylated zirconium oxide are dispersed in deionized water, stirred and dispersed, centrifuged, and solid matter is retained to obtain a filler with a multidimensional structure.

5. The UV curable wear-resistant ink according to claim 4, characterized in that: The wear-resistant additive is a wear-resistant additive modified by a modifier, and the modifier includes any one of BYK-199, BYK-2012, and Tego-755.

6. The UV curable wear-resistant ink according to claim 5, characterized in that: The additives also include lithium magnesium silicate or polyamide wax.

7. The UV curable wear-resistant ink according to claim 1, characterized in that: The additives also include polyvinyl alcohol.

8. The UV curable wear-resistant ink according to claim 1, characterized in that: The photoinitiator is a cleavage photoinitiator, selected from any one of 1-hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone, 2-hydroxy-2-methyl-1-phenyl-1-propanone, 819, benzophenone, 2,4-dihydroxybenzophenone, diphenylacetophenone, α,α-dimethoxy-α-phenylacetophenone, benzoin, benzoin dimethyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether, and phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide.

9. The method for preparing a UV curable wear-resistant ink according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, dissolving a light-curable resin, a wear-resistant additive, an additive, and a photoinitiator in a solvent to obtain a mixed solution; S2. Disperse the UV color paste in the above mixed solution and stir in the dark to obtain a premix; S3. Transfer the premix to a high-speed dispersant and stir at high speed until the pigment particle size is less than 0.45 μm, and then filter out the material to obtain a UV curable ink composition.

10. The method for preparing a UV curable wear-resistant ink according to claim 9, characterized in that: The speed of the high-speed stirring is 1000-2000 r / min.

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