Positioning type printing ink containing polyimide modified acrylic resin and preparation method thereof

Abstract

The invention discloses positioning type printing ink containing polyimide modified acrylic resin and a preparation method of the positioning type printing ink. The ink is prepared from the following components in parts by weight: 40-60 parts of pigment, 20-40 parts of polyimide modified acrylic resin, 2-5 parts of a dispersing agent, 2-5 parts of a flatting agent, 1-3 parts of an anti-skinning agent, 1-3 parts of a drying agent and 80-160 parts of a solvent. The prepared positioning type printing ink contains polyimide modified acrylic resin, the positioning performance, wear resistance and flexibility of the printing ink are improved, the performance of the printing ink is further improved by adding the dispersing agent, the flatting agent and the anti-skinning agent, BYK-2013 and EFKA-4050 are used in a combined mode, the adhesive force of the printing ink is improved, and the printing ink has the advantages of being environmentally friendly and free of pollution. Due to the combined use of isooctyl phosphate and trimethylolpropane triacrylate, the flowability of the ink is improved, and due to the combined use of N, N-diethyl hydroxylamine and methyl ethyl ketoxime, the anti-skinning performance of the ink is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of printing inks, and particularly relates to a positioning printing ink containing polyimide-modified acrylic resin and a preparation method thereof. Background Art

[0002] Positioning printing ink is a special functional ink, mainly used in high-precision printing processes such as positioning hot stamping, laser anti-counterfeiting, variable information printing, etc. Its core feature is the ability to form patterns or functional layers at specific positions through precise overprinting or positioning technology, and it is widely used in packaging, labels, anti-counterfeiting, and high-end printing fields.

[0003] Main types of positioning printing ink: 1. Laser positioning printing ink, combined with laser holographic technology, presents dynamic optical effects (such as rainbow colors, 3D stereoscopic sense) at specific positions; used for anti-counterfeiting labels of high-grade cigarette boxes, luxury packaging, enhancing visual impact. 2. Positioning hot stamping ink, combined with hot stamping foil, achieves local metallic luster or special texture effects; used for label printing, bookbinding, etc. 3. Variable data positioning printing ink, supports precise printing of variable information (such as serial numbers, QR codes), suitable for anti-counterfeiting traceability; used for food safety labels, electronic supervision codes, etc. 4. UV positioning curing ink, quickly cured by ultraviolet light, suitable for high-precision positioning printing, without VOCs emissions; used for electronic circuit printing, packaging printing, etc.

[0004] Polyimide-modified acrylic resin is a composite polymer material that combines the advantages of polyimide and acrylic resin. It is prepared by chemical copolymerization, physical blending, or cross-linking modification, and has both the high heat resistance and mechanical strength of polyimide and the easy processability and optical properties of acrylic resin. As a binder for positioning ink, polyimide-modified acrylic resin also has problems such as poor adhesion, poor fluidity, and easy peeling, and additives are needed for improvement. Summary of the Invention

[0005] The purpose of the present invention is to provide a positioning printing ink containing polyimide-modified acrylic resin and a preparation method thereof.

[0006] A positioning printing ink containing polyimide-modified acrylic resin, the printing ink is composed of the following components in parts by weight: 40 - 60 parts of pigment, 20 - 40 parts of polyimide-modified acrylic resin, 2 - 5 parts of dispersant, 2 - 5 parts of leveling agent, 1 - 3 parts of anti-skinning agent, 1 - 3 parts of dryer, and 80 - 160 parts of solvent.

[0007] The pigment is one or more of carbon black, titanium dioxide, iron oxide black, iron oxide red, iron oxide yellow, phthalocyanine blue, benzidine yellow, permanent red, pigment red 48, phthalocyanine green, quinacridone.

[0008] The preparation method of the polyimide-modified acrylic resin is as follows:

[0009] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of the amounts of methyl methacrylate, butyl acrylate and N,N-dimethylformamide is (1-3):(1-3):50 to obtain solution A;

[0010] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of the amounts of maleimide, N-phenylmaleimide and N,N-dimethylformamide is (2-4):(2-4):50 to obtain solution B;

[0011] (3) Mix solution A and solution B in equal volumes, add 1-3 wt% initiator azobisisobutyronitrile, and react at 60-80 °C for 6-12 h to obtain the polyimide-modified acrylic resin.

[0012] The dispersant is a mixture of BYK-2013 and EFKA-4050 mixed in a mass ratio of (1-3):1.

[0013] The leveling agent is a mixture of isooctyl phosphate and trimethylolpropane triacrylate mixed in a mass ratio of (2-5):1.

[0014] The anti-skinning agent is a mixture of N,N-diethylhydroxylamine and methyl ethyl ketoxime mixed in a mass ratio of (2-4):1.

[0015] The desiccant is one or more of cobalt isooctanoate, zirconium isooctanoate, manganese naphthenate, calcium naphthenate, and iron naphthenate.

[0016] The solvent is one or more of n-hexane, white oil, linseed oil, soybean oil, and C9 petroleum resin solution.

[0017] The preparation method of the positioning printing ink containing the polyimide-modified acrylic resin is characterized by the following steps:

[0018] (1) Take the polyimide-modified acrylic resin and the solvent and add them to a blender, stir at a speed of 50-100 rpm for 20-30 min, then heat up to 80-100 °C, add the pigment, and continue to stir for 10-30 min;

[0019] (2) Cool down to 35-45 °C, add the dispersant, leveling agent, anti-skinning agent, and desiccant, and stir at a speed of 300-500 rpm for 20-30 min to obtain a slurry;

[0020] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 35 - 45 °C, and the grinding pressure at 8 - 12 Pa / cm 2 , and grind and disperse it through the three-roll mill until the slurry particle size reaches 4 - 10 μm to obtain printing ink.

[0021] Advantages of the present invention: The positioning printing ink prepared by the present invention contains polyimide-modified acrylic resin, which improves the positioning, abrasion resistance and flexibility of the ink. By adding a dispersant, a leveling agent and an anti-skinning agent, the performance of the ink is further improved. The combination of BYK-2013 and EFKA-4050 improves the adhesion of the ink, the combination of isooctyl phosphate and trimethylolpropane triacrylate improves the fluidity of the ink, and the combination of N,N-diethylhydroxylamine and methyl ethyl ketone oxime improves the anti-skinning performance of the ink. Detailed implementation mode

[0022] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present invention more thorough and comprehensive.

[0023] Example 1

[0024] A positioning printing ink containing polyimide-modified acrylic resin, and the printing ink is composed of the following components in parts by weight: 50 parts of titanium dioxide, 30 parts of polyimide-modified acrylic resin, 4 parts of dispersant, 4 parts of leveling agent, 2 parts of anti-skinning agent, 2 parts of cobalt isooctanoate, and 120 parts of white oil; the dispersant is a mixture of BYK-2013 and EFKA-4050 mixed in a mass ratio of 2:1; the leveling agent is a mixture of isooctyl phosphate and trimethylolpropane triacrylate mixed in a mass ratio of 4:1; the anti-skinning agent is a mixture of N,N-diethylhydroxylamine and methyl ethyl ketone oxime mixed in a mass ratio of 3:1.

[0025] The preparation method of the polyimide-modified acrylic resin is as follows:

[0026] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of methyl methacrylate, butyl acrylate and N,N-dimethylformamide is 2:2:50 to obtain solution A;

[0027] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of maleimide, N-phenylmaleimide and N,N-dimethylformamide is 3:3:50 to obtain solution B;

[0028] (3) Mix solution A and solution B in equal volumes, add 2 wt% initiator azobisisobutyronitrile, and react at 70 °C for 8 h to obtain polyimide-modified acrylic resin.

[0029] The preparation method of the positioning printing ink containing polyimide-modified acrylic resin is characterized by the following steps:

[0030] (1) Take polyimide-modified acrylic resin and white oil and add them to a blender, stir at a speed of 70 rpm for 25 min, then heat up to 90 °C, add titanium dioxide, and continue stirring for 20 min;

[0031] (2) Cool down to 40 °C, add dispersant, leveling agent, anti-skinning agent, cobalt isooctanoate, and stir at a speed of 400 rpm for 25 min to obtain a slurry;

[0032] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 40 °C, and the grinding pressure at 10 pa / cm 2 , and grind and disperse it through the three-roll mill until the slurry particle size reaches 6 μm to obtain printing ink.

[0033] Example 2

[0034] A positioning printing ink containing polyimide-modified acrylic resin, the printing ink is composed of the following components in parts by weight: 40 parts of iron oxide red, 20 parts of polyimide-modified acrylic resin, 2 parts of dispersant, 2 parts of leveling agent, 2 parts of anti-skinning agent, 1 part of calcium naphthenate, and 90 parts of linseed oil; the dispersant is a mixture of BYK-2013 and EFKA-4050 mixed in a mass ratio of 1:1; the leveling agent is a mixture of isooctyl phosphate and trimethylolpropane triacrylate mixed in a mass ratio of 2:1; the anti-skinning agent is a mixture of N,N-diethylhydroxylamine and methyl ethyl ketoxime mixed in a mass ratio of 2:1.

[0035] The preparation method of the polyimide-modified acrylic resin is as follows:

[0036] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of methyl methacrylate, butyl acrylate, and N,N-dimethylformamide is 1:1:50 to obtain solution A;

[0037] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide, and the molar ratio of maleimide, N-phenylmaleimide, and N,N-dimethylformamide is 2:2:50 to obtain solution B;

[0038] (3) Mix solution A and solution B in equal volumes, add 1 wt% initiator azobisisobutyronitrile, and react at 60 °C for 12 h to obtain polyimide-modified acrylic resin.

[0039] The preparation method of the positioning printing ink containing polyimide-modified acrylic resin is characterized by the following steps:

[0040] (1) Take polyimide-modified acrylic resin and linseed oil and add them to a blender, stir at a speed of 50 rpm for 30 min, then raise the temperature to 80 °C, add iron oxide red, and continue to stir for 30 min;

[0041] (2) Cool down to 35 °C, add dispersant, leveling agent, anti-skinning agent, calcium naphthenate, and stir at a speed of 300 rpm for 30 min to obtain a slurry;

[0042] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 35 °C, and the grinding pressure at 8 pa / cm 2 , and grind and disperse it with a three-roll mill until the particle size of the slurry is 8 μm to obtain printing ink.

[0043] Example 3

[0044] A positioning printing ink containing polyimide-modified acrylic resin, the printing ink is composed of the following components in parts by weight: 60 parts of phthalocyanine blue, 40 parts of polyimide-modified acrylic resin, 5 parts of dispersant, 5 parts of leveling agent, 3 parts of anti-skinning agent, 3 parts of zirconium isooctanoate, 160 parts of soybean oil; the dispersant is a mixture of BYK-2013 and EFKA-4050 mixed in a mass ratio of 3:1; the leveling agent is a mixture of isooctyl phosphate and trimethylolpropane triacrylate mixed in a mass ratio of 5:1; the anti-skinning agent is a mixture of N,N-diethylhydroxylamine and methyl ethyl ketone oxime mixed in a mass ratio of 4:1.

[0045] The preparation method of the polyimide-modified acrylic resin is as follows:

[0046] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of the amounts of methyl methacrylate, butyl acrylate, and N,N-dimethylformamide is 3:3:50 to obtain solution A;

[0047] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of the amounts of maleimide, N-phenylmaleimide, and N,N-dimethylformamide is 4:4:50 to obtain solution B;

[0048] (3) Mix solution A and solution B in equal volumes, add 3 wt% initiator azobisisobutyronitrile, and react at 80 °C for 6 h to obtain polyimide-modified acrylic resin.

[0049] The preparation method of the positioning type printing ink containing polyimide-modified acrylic resin is characterized by the following steps:

[0050] (1) Take polyimide-modified acrylic resin and soybean oil and add them to a blender, stir at a speed of 100 rpm for 20 min, then raise the temperature to 100 °C, add phthalocyanine blue, and continue to stir for 10 min;

[0051] (2) Cool down to 45 °C, add dispersant, leveling agent, anti-skinning agent, zirconium isooctanoate, and stir at a speed of 500 rpm for 20 min to obtain a slurry;

[0052] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 45 °C, and the grinding pressure at 12 pa / cm 2 , and grind and disperse it on the three-roll mill until the particle size of the slurry is 4 μm to obtain printing ink.

[0053] Comparative Example 1

[0054] A positioning type printing ink containing polyimide-modified acrylic resin, the printing ink is composed of the following components in parts by weight: 50 parts of titanium dioxide, 30 parts of polyimide-modified acrylic resin, 4 parts of BYK-2013, 4 parts of leveling agent, 2 parts of anti-skinning agent, 2 parts of cobalt isooctanoate, and 120 parts of white oil; the leveling agent is a mixture of isooctyl phosphate and trimethylolpropane triacrylate in a mass ratio of 4:1; the anti-skinning agent is a mixture of N,N-diethylhydroxylamine and methyl ethyl ketoxime in a mass ratio of 3:1.

[0055] The preparation method of the polyimide-modified acrylic resin is as follows:

[0056] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of the amounts of methyl methacrylate, butyl acrylate, and N,N-dimethylformamide is 2:2:50 to obtain solution A;

[0057] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide, and the molar ratio of the amounts of maleimide, N-phenylmaleimide, and N,N-dimethylformamide is 3:3:50 to obtain solution B;

[0058] (3) Mix solution A and solution B in equal volumes, add 2 wt% initiator azobisisobutyronitrile, and react at 70 °C for 8 h to obtain polyimide-modified acrylic resin.

[0059] The preparation method of the positioning printing ink containing polyimide-modified acrylic resin is characterized in that it is carried out according to the following steps:

[0060] (1) Take polyimide-modified acrylic resin and white oil and add them into a blender, stir at a speed of 70 rpm for 25 min, then heat up to 90 °C, add titanium dioxide, and continue to stir for 20 min;

[0061] (2) Cool down to 40 °C, add BYK-2013, leveling agent, anti-skinning agent, cobalt isooctanoate, and stir at a speed of 400 rpm for 25 min to obtain a slurry;

[0062] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 40 °C, and the grinding pressure at 10 pa / cm 2 , and grind and disperse it through the three-roll mill until the particle size of the slurry is 6 μm to obtain printing ink.

[0063] Comparative Example 2

[0064] A positioning printing ink containing polyimide-modified acrylic resin, the printing ink is composed of the following components in parts by weight: 50 parts of titanium dioxide, 30 parts of polyimide-modified acrylic resin, 4 parts of EFKA-4050, 4 parts of leveling agent, 2 parts of anti-skinning agent, 2 parts of cobalt isooctanoate, 120 parts of white oil; the leveling agent is a mixture of isooctyl phosphate and trimethylolpropane triacrylate mixed in a mass ratio of 4:1; the anti-skinning agent is a mixture of N,N-diethylhydroxylamine and methyl ethyl ketone oxime mixed in a mass ratio of 3:1.

[0065] The preparation method of the polyimide-modified acrylic resin is as follows:

[0066] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of methyl methacrylate, butyl acrylate and N,N-dimethylformamide is 2:2:50 to obtain solution A;

[0067] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide, and the molar ratio of maleimide, N-phenylmaleimide and N,N-dimethylformamide is 3:3:50 to obtain solution B;

[0068] (3) Mix solution A and solution B in equal volume, add 2 wt% initiator azobisisobutyronitrile, and react at 70 °C for 8 h to obtain polyimide-modified acrylic resin.

[0069] The preparation method of the positioning printing ink containing polyimide-modified acrylic resin is characterized by the following steps:

[0070] (1) Take polyimide-modified acrylic resin and white oil and add them to a blender. Stir at a speed of 70 rpm for 25 min, then heat up to 90 °C, add titanium dioxide, and continue stirring for 20 min;

[0071] (2) Cool down to 40 °C, add EFKA-4050, leveling agent, anti-skinning agent, cobalt isooctanoate, and stir at a speed of 400 rpm for 25 min to obtain a slurry;

[0072] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 40 °C, and the grinding pressure at 10 pa / cm 2 , and grind and disperse it on the three-roll mill until the particle size of the slurry is 6 μm to obtain printing ink.

[0073] Comparative Example 3

[0074] A positioning printing ink containing polyimide-modified acrylic resin, the printing ink is composed of the following components in parts by weight: 50 parts of titanium dioxide, 30 parts of polyimide-modified acrylic resin, 4 parts of dispersant, 4 parts of isooctyl phosphate, 2 parts of anti-skinning agent, 2 parts of cobalt isooctanoate, and 120 parts of white oil; the dispersant is a mixture of BYK-2013 and EFKA-4050 mixed in a mass ratio of 2:1; the anti-skinning agent is a mixture of N,N-diethylhydroxylamine and methyl ethyl ketone oxime mixed in a mass ratio of 3:1.

[0075] The preparation method of the polyimide-modified acrylic resin is as follows:

[0076] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of methyl methacrylate, butyl acrylate, and N,N-dimethylformamide is 2:2:50 to obtain solution A;

[0077] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide. The molar ratio of maleimide, N-phenylmaleimide, and N,N-dimethylformamide is 3:3:50 to obtain solution B;

[0078] (3) Mix solution A and solution B in equal volumes, add 2 wt% initiator azobisisobutyronitrile, and react at 70 °C for 8 h to obtain polyimide-modified acrylic resin.

[0079] The preparation method of the positioning printing ink containing polyimide-modified acrylic resin is characterized by the following steps:

[0080] (1) Put the polyimide-modified acrylic resin and white oil into a blender, stir at a speed of 70 rpm for 25 min, then heat up to 90 °C, add titanium dioxide, and continue to stir for 20 min;

[0081] (2) Cool down to 40 °C, add a dispersant, isooctyl phosphate, an anti-skinning agent, and cobalt isooctanoate, and stir at a speed of 400 rpm for 25 min to obtain a slurry;

[0082] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 40 °C, and the grinding pressure at 10 pa / cm 2 , and grind and disperse it through the three-roll mill until the particle size of the slurry is 6 μm to obtain printing ink.

[0083] Comparative Example 4

[0084] A positioning printing ink containing a polyimide-modified acrylic resin, and the printing ink is composed of the following components in parts by weight: 50 parts of titanium dioxide, 30 parts of polyimide-modified acrylic resin, 4 parts of dispersant, 4 parts of trimethylolpropane triacrylate, 2 parts of anti-skinning agent, 2 parts of cobalt isooctanoate, and 120 parts of white oil; the dispersant is a mixture of BYK-2013 and EFKA-4050 mixed in a mass ratio of 2:1; the anti-skinning agent is a mixture of N,N-diethylhydroxylamine and methyl ethyl ketone oxime mixed in a mass ratio of 3:1.

[0085] The preparation method of the polyimide-modified acrylic resin is as follows:

[0086] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of methyl methacrylate, butyl acrylate, and N,N-dimethylformamide is 2:2:50 to obtain solution A;

[0087] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of maleimide, N-phenylmaleimide, and N,N-dimethylformamide is 3:3:50 to obtain solution B;

[0088] (3) Mix solution A and solution B in equal volumes, add 2 wt% initiator azobisisobutyronitrile, and react at 70 °C for 8 h to obtain the polyimide-modified acrylic resin.

[0089] The preparation method of the positioning printing ink containing the polyimide-modified acrylic resin is characterized in that it is carried out according to the following steps:

[0090] (1) Add polyimide-modified acrylic resin and white oil into a blender, stir at a speed of 70 rpm for 25 min, then heat up to 90 °C, add titanium dioxide, and continue stirring for 20 min;

[0091] (2) Cool down to 40 °C, add a dispersant, trimethylolpropane triacrylate, an anti-skinning agent, and cobalt isooctanoate, and stir at a speed of 400 rpm for 25 min to obtain a slurry;

[0092] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 40 °C, and the grinding pressure at 10 pa / cm 2 , and grind and disperse it through the three-roll mill until the slurry particle size reaches 6 μm to obtain printing ink.

[0093] Comparative Example 5

[0094] A positioning printing ink containing polyimide-modified acrylic resin, and the printing ink is composed of the following components in parts by weight: 50 parts of titanium dioxide, 30 parts of polyimide-modified acrylic resin, 4 parts of dispersant, 4 parts of leveling agent, 2 parts of N,N-diethylhydroxylamine, 2 parts of cobalt isooctanoate, and 120 parts of white oil; the dispersant is a mixture of BYK-2013 and EFKA-4050 mixed in a mass ratio of 2:1; the leveling agent is a mixture of isooctyl phosphate and trimethylolpropane triacrylate mixed in a mass ratio of 4:1.

[0095] The preparation method of the polyimide-modified acrylic resin is as follows:

[0096] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of methyl methacrylate, butyl acrylate, and N,N-dimethylformamide is 2:2:50 to obtain solution A;

[0097] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of maleimide, N-phenylmaleimide, and N,N-dimethylformamide is 3:3:50 to obtain solution B;

[0098] (3) Mix solution A and solution B in equal volumes, add 2 wt% initiator azobisisobutyronitrile, and react at 70 °C for 8 h to obtain polyimide-modified acrylic resin.

[0099] The preparation method of the positioning printing ink containing polyimide-modified acrylic resin is characterized in that it is carried out according to the following steps:

[0100] (1) Add polyimide-modified acrylic resin and white oil into a blender, stir at a speed of 70 rpm for 25 min, then heat up to 90 °C, add titanium dioxide, and continue stirring for 20 min;

[0101] (2) Cool down to 40 °C, add a dispersant, a leveling agent, N,N-diethylhydroxylamine, and cobalt isooctanoate, and stir at a speed of 400 rpm for 25 min to obtain a slurry;

[0102] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 40 °C, and the grinding pressure at 10 pa / cm 2 , and grind and disperse it through the three-roll mill until the slurry particle size reaches 6 μm to obtain printing ink.

[0103] Comparative Example 6

[0104] A positioning printing ink containing polyimide-modified acrylic resin, and the printing ink is composed of the following components in parts by weight: 50 parts of titanium dioxide, 30 parts of polyimide-modified acrylic resin, 4 parts of dispersant, 4 parts of leveling agent, 2 parts of methyl ethyl ketoxime, 2 parts of cobalt isooctanoate, and 120 parts of white oil; the dispersant is a mixture of BYK-2013 and EFKA-4050 mixed in a mass ratio of 2:1; the leveling agent is a mixture of isooctyl phosphate and trimethylolpropane triacrylate mixed in a mass ratio of 4:1.

[0105] The preparation method of the polyimide-modified acrylic resin is as follows:

[0106] (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of the amounts of methyl methacrylate, butyl acrylate, and N,N-dimethylformamide is 2:2:50 to obtain solution A;

[0107] (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of the amounts of maleimide, N-phenylmaleimide, and N,N-dimethylformamide is 3:3:50 to obtain solution B;

[0108] (3) Mix solution A and solution B in equal volumes, add 2 wt% initiator azobisisobutyronitrile, and react at 70 °C for 8 h to obtain polyimide-modified acrylic resin.

[0109] The preparation method of the positioning printing ink containing polyimide-modified acrylic resin is characterized in that it is carried out according to the following steps:

[0110] (1) Add the polyimide-modified acrylic resin and white oil into a blender, stir at a speed of 70 rpm for 25 min, then heat up to 90 °C, add titanium dioxide, and continue stirring for 20 min;

[0111] (2) Cool down to 40 °C, add the dispersant, leveling agent, methyl ethyl ketoxime, and cobalt isooctanoate, and stir at a speed of 400 rpm for 25 min to obtain a slurry;

[0112] (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 40 °C, and the grinding pressure at 10 pa / cm 2 , and grind and disperse it through the three-roll mill until the slurry particle size reaches 6 μm to obtain printing ink.

[0113] Experimental examples:

[0114] Detect the coloring power of the positioning printing inks prepared in Examples 1-3 and Comparative Examples 1-2 according to the national standard GB / T 14624.2-2008. The experimental results are statistically analyzed using statistical software. The measurement data results are expressed in , and the Kolmogorov-Smirnov test method is used for data normality test. For data that conforms to the normal distribution, the t-test is used to compare the mean differences between the two groups. A P < 0.05 indicates that the difference is statistically significant. The measurement results are shown in Table 1:

[0115] Table 1

[0116]

[0117] Note: * represents P < 0.05 compared with the group of Example 1.

[0118] Detect the fluidity of the positioning printing inks prepared in Examples 1-3 and Comparative Examples 3-4 according to the national standard GB / T 13217.4-2020. The measurement results are shown in Table 2:

[0119] Table 2

[0120]

[0121] Note: * represents P < 0.05 compared with the group of Example 1.

[0122] Detect the film-forming drying time and skinning time of the positioning printing inks prepared in Examples 1-3 and Comparative Examples 5-6 according to GB / T 14624.4-2008. The measurement results are shown in Table 3:

[0123] Table 3

[0124]

[0125] Note: * represents P < 0.05 compared with the group of Example 1.

[0126] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A positioning printing ink containing polyimide-modified acrylic resin, characterized in that, The printing ink is composed of the following components in parts by weight: 40-60 parts of pigment, 20-40 parts of polyimide-modified acrylic resin, 2-5 parts of dispersant, 2-5 parts of leveling agent, 1-3 parts of anti-skinning agent, 1-3 parts of dryer, and 80-160 parts of solvent.

2. The positioning printing ink containing polyimide-modified acrylic resin according to claim 1, characterized in that The pigment is one or more of carbon black, titanium dioxide, iron oxide black, iron oxide red, iron oxide yellow, phthalocyanine blue, benzidine yellow, permanent red, pigment red 48, phthalocyanine green, quinacridone.

3. The positioning printing ink containing the polyimide-modified acrylic resin according to claim 1, wherein The preparation method of the polyimide-modified acrylic resin is as follows: (1) Take methyl methacrylate and butyl acrylate as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of the amounts of methyl methacrylate, butyl acrylate and N,N-dimethylformamide is (1-3):(1-3):50 to obtain solution A; (2) Take maleimide and N-phenylmaleimide as monomers and dissolve them in N,N-dimethylformamide; the molar ratio of the amounts of maleimide, N-phenylmaleimide and N,N-dimethylformamide is (2-4):(2-4):50 to obtain solution B; (3) Mix solution A and solution B in equal volumes, add 1-3 wt% initiator azobisisobutyronitrile, and react at 60-80 °C for 6-12 h to obtain the polyimide-modified acrylic resin.

4. The positioning printing ink containing polyimide-modified acrylic resin according to claim 1, characterized in that, The dispersant is a mixture of BYK-2013 and EFKA-4050 mixed in a mass ratio of (1-3):

1.

5. The positioning printing ink containing the polyimide-modified acrylic resin according to claim 1, wherein The leveling agent is a mixture of isooctyl phosphate and trimethylolpropane triacrylate mixed in a mass ratio of (2-5):

1.

6. The positioning printing ink containing polyimide-modified acrylic resin according to claim 1, wherein The anti-skinning agent is a mixture of N,N-diethylhydroxylamine and methyl ethyl ketoxime mixed in a mass ratio of (2-4):

1.

7. The positioning printing ink containing the polyimide-modified acrylic resin according to claim 1, characterized in that, The dryer is one or more of cobalt isooctanoate, zirconium isooctanoate, manganese naphthenate, calcium naphthenate, iron naphthenate.

8. The positioning printing ink containing polyimide-modified acrylic resin according to claim 1, characterized in that, The solvent is one or more of n-hexane, white oil, linseed oil, soybean oil, C9 petroleum resin solution.

9. The preparation method of the positioning printing ink containing the polyimide-modified acrylic resin according to claim 1, characterized in that, It is carried out according to the following steps: (1) Take the polyimide-modified acrylic resin and the solvent and add them to a blender, stir at a speed of 50-100 rpm for 20-30 min, then heat up to 80-100 °C, add the pigment, and continue to stir for 10-30 min; (2) Cool down to 35-45 °C, add the dispersant, leveling agent, anti-skinning agent, and dryer, and stir at a speed of 300-500 rpm for 20-30 min to obtain the slurry; (3) Transfer the slurry obtained in step (2) to a three-roll mill, control the grinding temperature at 35 - 45 °C, and the grinding pressure at 8 - 12 Pa / cm 2 , and disperse it through grinding by the three-roll mill until the particle size of the slurry reaches 4 - 10 μm to obtain printing ink.

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