Printing ink nanometer technology for packaging box

Abstract

The invention discloses a packaging box printing ink nanometer technology, which comprises the following processing steps: (1) mixing a nanometer pigment with a silane coupling agent to obtain a modified nanometer pigment; (2) adding a dispersing agent, the modified nano pigment prepared in the step (1) and hydrophobic modified nano silicon dioxide into an environment-friendly solvent to obtain prefabricated ink; (3) grinding the prefabricated printing ink obtained in the step (2) to obtain a printing ink fine material; (4) adding acrylic resin and polyurethane resin into the fine printing ink material ground in the step (3), and stirring until the acrylic resin and the polyurethane resin are dissolved to obtain a pre-dispersion liquid; and (5) adding a flatting agent and a defoaming agent into the pre-dispersion liquid obtained in the step (4), and uniformly stirring to obtain the nano ink composition. The printing performance, the adhesion performance, the weather resistance and the environmental protection performance of the ink are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ink, in particular to a nanotechnology of ink for packaging boxes. Background Art

[0002] In the packaging printing field, traditional ink processes, when used on holographic silver cardboard substrates, suffer from uneven pigment particle dispersion, insufficient print clarity, and poor adhesion between the ink and the substrate. For example, when using ordinary inks to print cigarette boxes and cosmetics packaging, it is difficult to achieve uniform color and delicate texture on holographic silver cardboard, and the abrasion resistance is poor. Furthermore, the high volatile organic compound (VOC) content of ink solvents in traditional processes does not meet the requirements of environmentally friendly printing. Summary of the Invention

[0003] Purpose of the present invention: In order to overcome the defects of the prior art, the present invention provides a nano-technology for ink for packaging boxes to improve the printing performance, adhesion performance, weather resistance and environmental protection performance of the ink.

[0004] The technical solution of the present invention is a nano-process for ink for packaging boxes, comprising the following processing steps:

[0005] (1) mixing the nano pigment with a silane coupling agent to obtain a modified nano pigment;

[0006] (2) adding a dispersant, the modified nano-pigment obtained in step (1), and hydrophobically modified nano-silica to an environmentally friendly solvent to obtain a prefabricated ink;

[0007] (3) grinding the prefabricated ink obtained in step (2) to obtain ink fines;

[0008] (4) adding acrylic resin and polyurethane resin to the ink fine material ground in step (3), stirring until dissolved, to obtain a pre-dispersion liquid;

[0009] (5) adding a leveling agent and a defoaming agent to the pre-dispersion liquid obtained in step (4), and stirring the mixture to obtain a nano ink composition.

[0010] By adopting the above technical solution, the ink nanotechnology for packaging boxes of the present invention shows significant effects and advantages after completing the above processing steps.

[0011] First, in terms of printing performance, the use of nano-pigments and silane coupling agents for modification, as well as the precise grinding process, results in uniform distribution of ink particles, significantly improving the clarity of printed patterns, resulting in vibrant colors and a delicate texture.

[0012] Secondly, in terms of adhesion performance, the nano-ink composition prepared by the process of the present invention has significantly enhanced adhesion to substrates such as laser silver cardboard, effectively avoiding the problem of printed patterns falling off or wearing, and improving the durability and aesthetics of the packaging box;

[0013] In terms of weather resistance, polymer materials such as acrylic resin and polyurethane resin are added to the process of the present invention. Acrylic resin has good gloss and weather resistance, and polyurethane resin has excellent wear resistance and adhesion, so that the printed pattern can still remain bright and clear under long-term light, humidity and other environmental conditions.

[0014] By surface modification of nanopigments, their dispersibility in environmentally friendly solvents and resins can be improved, nanoparticle agglomeration can be avoided, and the color performance and stability of the ink can be improved.

[0015] In addition, the dispersant is an anionic dispersant or a nonionic dispersant, such as a polyacrylate dispersant, a polyether dispersant, etc. The function of the dispersant is to reduce the surface tension of the nano-pigment and nano-silica particles, prevent the particles from agglomerating, and make the nano-particles evenly dispersed in the ink system, thereby improving the stability and printing performance of the ink. The leveling agent is an organosilicon leveling agent or an acrylate leveling agent, and its function is to reduce the surface tension of the ink, so that the ink can be evenly spread during the printing process, eliminate defects such as orange peel and shrinkage holes in the printed pattern, and improve the surface smoothness and glossiness of the printed product. The defoamer is a polyether-modified silicon defoamer or a mineral oil defoamer, which is used to eliminate bubbles generated in the preparation and printing process of the ink, avoid bubbles from forming defects such as pinholes and pitting in the printed pattern, and ensure printing quality.

[0016] In addition, the process of the present invention also focuses on improving environmental performance. By using environmentally friendly solvents and reducing the content of volatile organic compounds (VOCs), it meets the current demand for environmentally friendly printing, reduces environmental pollution, and is conducive to sustainable development.

[0017] In summary, the nanotechnology of the packaging box ink of the present invention has achieved remarkable results in improving the printing performance, adhesion performance, weather resistance and environmental protection performance of the ink, and has broad application prospects and market value.

[0018] Preferably, the nano pigment in step (1) is one or more of nano titanium dioxide, nano iron oxide and nano carbon black.

[0019] Using this advanced technical solution, these nanopigments exhibit excellent dispersibility and stability, significantly enhancing the color saturation and hiding power of inks. By precisely controlling the type and ratio of the nanopigments, a rich variety of colors can be formulated to meet the personalized needs of different packaging boxes. Furthermore, the inclusion of nanopigments enhances the ink's anti-aging properties, making printed designs more durable.

[0020] Preferably, the nano pigment and the silane coupling agent are mixed in a ratio of 10:1 and reacted under high-speed stirring to obtain a modified nano pigment with a particle size of 20-50 nm.

[0021] By adopting the above-mentioned further technical solution, the hydrophobically modified nano-silica can be better dispersed in the ink system, thereby enhancing the hardness, wear resistance and scratch resistance of the ink, and at the same time improving the rheological properties of the ink, so that the ink has better fluidity and transferability during the printing process.

[0022] Preferably, the hydrophobically modified nano-silica in step (2) is obtained by subjecting the surface of nano-silica to hydrophobic modification with a silane coupling agent, and the particle size of the hydrophobically modified nano-silica is 30-35 nm.

[0023] By adopting the above-mentioned further technical solution, the hydrophobically modified nano-silica can be better dispersed in the ink system, thereby enhancing the hardness, wear resistance and scratch resistance of the ink, and at the same time improving the rheological properties of the ink, so that the ink has better fluidity and transferability during the printing process.

[0024] Preferably, the environmentally friendly solvent in step (2) is composed of ethanol, n-propanol, and ethyl acetate in a volume ratio of 2:1:1.

[0025] The above-mentioned further technical solution is adopted: the environmentally friendly solvent is a mixture of one or more organic solvents such as ethanol, n-propanol, ethyl acetate, etc. These solvents have the characteristics of low toxicity and low volatility, meet environmental protection requirements, and can dissolve resin well and adjust the viscosity and drying speed of the ink.

[0026] Preferably, the mass percentages of the components in step (2) are as follows: 58-74% of the environmentally friendly solvent, 3-5% of the dispersant, 15-25% of the modified nano-pigment, and 8-12% of the hydrophobically modified nano-silica.

[0027] The aforementioned further technical solution, with the aforementioned mass percentages, ensures that all components in the ink are fully dissolved and evenly dispersed, resulting in a fine ink with high hardness, abrasion resistance, and scratch resistance. Furthermore, this formulation ensures ink stability and excellent printing properties, resulting in clear, vibrant, and long-lasting printed packaging designs.

[0028] Preferably, in step (3), the prefabricated ink is ground using a sand mill with zirconium oxide beads to control the fineness of the ink to be 5-10 μm.

[0029] A further technical solution, using a sand mill for grinding, ensures uniform refinement of ink particles. The high hardness and wear resistance of zirconium oxide beads effectively improve grinding efficiency and quality. Controlling the ink fineness to 5-10μm ensures fineness while avoiding fluidity issues caused by excessive fineness. This ensures ink stability and uniformity during printing, resulting in high-quality printing results.

[0030] Preferably, the mass percentages of the components in step (4) are as follows: 65-70% of ink fines, 30-35% of acrylic resin and polyurethane resin in total, wherein the ratio of acrylic resin to polyurethane resin is 2:1.

[0031] This further technical solution achieves a ratio that ensures the ink's film-forming properties and glossiness while avoiding the drying difficulties and increased costs associated with excessive resin content. Precisely controlling the resin ratio and content further enhances the ink's printing quality and overall performance, resulting in more aesthetically pleasing and durable printed packaging. A 2:1 ratio of acrylic resin to polyurethane resin fully leverages their complementary strengths, enhancing the ink's adhesion and flexibility.

[0032] Preferably, the mass percentages of the components in step (5) are as follows: 95-98.5% of pre-dispersion liquid, 1-3% of leveling agent, and 0.5-2% of defoaming agent.

[0033] By adopting the above further technical solution: by precisely controlling the mass percentages of the three components, the composition of the ink can be further optimized so that it can have better printing effect and adaptability while meeting the printing requirements.

[0034] Preferably, the method further comprises step (6), wherein the nano ink composition obtained in step (5) is used for printing on laser silver card paper in combination with a UV light curing process.

[0035] This advanced technical solution not only improves the ink's adhesion to the laser silver cardboard, but also significantly shortens the drying time of printed products and improves production efficiency through the rapid curing characteristics of the UV light curing process. The UV light curing process ensures that the ink forms a hard and glossy film on the surface of the laser silver cardboard, which not only enhances the visual effect of the printed product but also improves its wear and scratch resistance. This makes the printed packaging more durable while maintaining its aesthetics, meeting the high quality requirements of the high-end market. DETAILED DESCRIPTION

[0036] Example 1

[0037] 1. Mix 100g of nano-titanium dioxide with 10g of silane coupling agent and react at 1000r / min for 50min to obtain modified nano-pigment;

[0038] 2. Weigh 67g of environmentally friendly solvent (composed of ethanol, n-propanol, and ethyl acetate in a volume ratio of 2:1:1), add 3g of dispersant, 20g of modified nano-pigment, and 10g of hydrophobically modified nano-silica (surface treated with a silane coupling agent, with a particle size of 30-35nm), and stir at 400r / min for 40min to obtain a prefabricated ink;

[0039] 3. Grind the prefabricated ink with 0.8mm zirconium oxide beads in a sand mill at 1200r / min for 2.5h, controlling the ink fineness to 8μm, to obtain ink fines;

[0040] 4. Add 35g of acrylic resin and polyurethane resin in a mass ratio of 2:1 to 65g of ink fines and stir at 700r / min until dissolved to obtain a pre-dispersion liquid;

[0041] 5. Take 97g of the pre-dispersion liquid, add 2g of leveling agent and 1g of defoaming agent, and stir evenly to prepare a nano ink composition.

[0042] 6. The nano ink composition is combined with UV light curing process for laser silver cardboard printing.

[0043] Example 2

[0044] 1. Mix 100g of nano carbon black and 10g of silane coupling agent in proportion, and react under high-speed stirring at 1200r / min for 45min to obtain modified nano pigment;

[0045] 2. Weigh 72g of environmentally friendly solvent, add 5g of dispersant, 15g of modified nano-pigment, and 8g of hydrophobically modified nano-silica, and stir at 300r / min for 30min to prepare a prefabricated ink;

[0046] 3. Use a sand mill with 0.5mm zirconium oxide beads to grind the pre-made ink at a speed of 1000r / min for 2h, and control the ink fineness to 5μm;

[0047] 4. Add 30g of acrylic resin and polyurethane resin in a mass ratio of 2:1 to 70g of ink fines and stir at 600r / min until completely dissolved to obtain a pre-dispersion liquid;

[0048] 5. Take 98.5g of the pre-dispersion liquid, add 1g of a leveling agent and 0.5g of a defoaming agent, and stir evenly to obtain a nano ink composition.

[0049] 6. The nano ink composition is combined with UV light curing process for laser silver cardboard printing.

[0050] Example 3

[0051] 1. Mix 100g of nano-iron oxide with 10g of silane coupling agent, and react for 60min under high-speed stirring at 800r / min to obtain modified nano-pigment;

[0052] 2. Add 4g of dispersant, 25g of modified nano-pigment, and 12g of hydrophobically modified nano-silica to 59g of environmentally friendly solvent and stir at 500r / min for 45min to obtain a prefabricated ink;

[0053] 3. Grind the pre-made ink with 1mm zirconium oxide beads in a sand mill at 1500r / min for 3h to make the ink fineness reach 10μm;

[0054] 4. Add 32 g of acrylic resin and polyurethane resin in a mass ratio of 2:1 to 68 g of ink fines, stir at 800 r / min until dissolved, and obtain a pre-dispersion liquid.

[0055] 5. Take 95g of the pre-dispersion liquid, add 3g of leveling agent and 2g of defoaming agent, and stir evenly to obtain a nano ink composition.

[0056] 6. The nano ink composition is combined with UV light curing process for laser silver cardboard printing.

[0057] The printed pattern has good three-dimensional effect and glossiness, and the ink performance remains stable after being placed in harsh environments such as humidity and high temperature for a period of time.

[0058] Comparative Example 1

[0059] Compared with Example 2: No hydrophobically modified nano-silica was added, and the remaining steps were the same. After printing on a plastic packaging box, the abrasion test (300 times) showed obvious shedding, and the surface flatness and glossiness were poor.

[0060] Comparative Example 2

[0061] Compared with Example 3: The nano pigment was not subjected to surface modification treatment, and the remaining steps were the same. During preparation, the pigment agglomerated, the printed pattern had uneven color, and faded after weather resistance testing.

[0062] Comparison table of test results of various printing patterns:

[0063]

[0064] in conclusion:

[0065] 1. Examples 1-3: Through modification of nano-pigments, addition and resin compounding, the inks meet the standards in terms of gloss, adhesion, wear resistance and other properties.

[0066] 2. Comparative Example 1: The lack of nano-silica results in a significant decrease in the wear resistance and surface properties of the ink.

[0067] 3. Comparative Example 2: Unmodified nano-pigments induce agglomeration, affecting color uniformity and weather resistance, verifying the necessity of surface modification.

Claims

1. A nanotechnology for ink used in packaging boxes, characterized in that: The following processing steps are included: (1) Mixing the nano pigment with a silane coupling agent to obtain a modified nano pigment; (2) adding a dispersant, the modified nano-pigment obtained in step (1), and hydrophobically modified nano-silica to an environmentally friendly solvent to obtain a prefabricated ink; (3) Grinding the prefabricated ink obtained in step (2) to obtain ink fines; (4) adding acrylic resin and polyurethane resin to the ink fine material ground in step (3), stirring until dissolved, to obtain a pre-dispersion liquid; (5) Add a leveling agent and a defoaming agent to the pre-dispersion liquid obtained in step (4), and stir evenly to prepare a nano ink composition.

2. The ink nanotechnology according to claim 1, characterized in that: The nano pigment in step (1) is one or more of nano titanium dioxide, nano iron oxide and nano carbon black.

3. The ink nanotechnology according to claim 1, characterized in that: In step (1): the nano pigment and the silane coupling agent are mixed in a ratio of 10:1, and reacted under high-speed stirring to obtain a modified nano pigment with a particle size of 20-50 nm.

4. The ink nanotechnology according to claim 1, characterized in that: The hydrophobically modified nano-silica in step (2) is obtained by subjecting the surface of nano-silica to hydrophobic modification with a silane coupling agent, and the particle size of the hydrophobically modified nano-silica is 30-35 nm.

5. The ink nanotechnology according to claim 1, characterized in that: The environmentally friendly solvent in step (2) is composed of ethanol, n-propanol, and ethyl acetate in a volume ratio of 2:1:

1.

6. The ink nanotechnology according to claim 1, characterized in that: The mass percentages of the components in step (2) are as follows: 58-74% of the environmentally friendly solvent, 3-5% of the dispersant, 15-25% of the modified nano-pigment, and 8-12% of the hydrophobically modified nano-silica.

7. The ink nanotechnology according to claim 1, characterized in that: In step (3), the pre-made ink is ground using a sand mill with zirconium oxide beads to control the fineness of the ink to be 5-10 μm.

8. The ink nanotechnology according to claim 1, characterized in that: The mass percentages of the components in step (4) are as follows: ink fines 65-70%, acrylic resin and polyurethane resin 30-35% in total, wherein the ratio of acrylic resin to polyurethane resin is 2:

1.

9. The ink nanotechnology according to claim 1, characterized in that: The mass percentages of the components in step (5) are as follows: 95-98.5% of pre-dispersion liquid, 1-3% of leveling agent, and 0.5-2% of defoaming agent.

10. The ink nanotechnology according to any one of claims 1 to 9, characterized in that: The method further includes step (6), wherein the nano ink composition obtained in step (5) is used in conjunction with a UV light curing process for printing on laser silver card paper.

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