Preparation method of bio-based ink of cardanol modified acrylic resin

Abstract

The invention relates to a preparation method of bio-based ink of cardanol modified acrylic resin, and belongs to the technical field of ink preparation. The preparation method comprises the following steps: stirring and mixing cardanol, a 6, 6 '-dihydroxy-3, 3'-biphenyl dicarboxylic acid / Cu complex, triethylamine and a dichloromethane solvent at room temperature, slowly dropwise adding a mixture of acryloyl chloride and dichloromethane, and performing reduced pressure distillation to remove dichloromethane after reaction to obtain a propenyl cardanol ester / propenyl biphenyl dicarboxylic acid ester / Cu complex mixture; the preparation method comprises the following steps: carrying out a reaction on the obtained product, methyl methacrylate, pentaerythritol tetramercaptoacetate, acrylic acid, a triazine trithiol trisodium salt hydrate, toluene and a photoinitiator under ultraviolet irradiation; dropwise adding ammonia water to adjust pH, and performing reduced pressure distillation after reaction to obtain cardanol modified acrylic resin; and dispersing the cardanol modified acrylic resin with deionized water, ethanol, a pigment, a defoaming agent, a thickening agent and a coupling agent at a high speed, and adjusting the pH value with ammonia water to obtain the cardanol modified acrylic resin bio-based ink.

Description

Technical Field

[0001] The invention relates to the technical field of ink preparation, in particular to a method for preparing a bio-based ink of cardanol-modified acrylic resin. Background Art

[0002] As people pay more and more attention to the living environment and physical and mental health, the quality requirements for printed products are getting higher and higher. Acrylic water-based ink has become the first choice of resin for water-based ink because of its strong adhesion, excellent weather resistance, good heat resistance, high gloss, and excellent color retention. At present, most of the raw materials of acrylic water-based ink on the market come from petrochemical products. Petroleum is a non-renewable resource, while bio-based materials are new materials made from renewable biomass through biological, chemical and physical methods. They are green and environmentally friendly, and the raw materials are renewable.

[0003] Chinese patent CN117844297B: discloses a water-based printing ink and a preparation method thereof, comprising the following components: 20%-35% purified water, 4%-7% of a mixture of anhydrous ethanol and deionized water prepared in a ratio of 7:3, 1%-2% of AK201 dispersant, 40%-50% of P16, 4%-7% of epoxy resin, 0.4%-0.7% of adsorption resin, 7%-9% of toner, 0.9%-1% of polyethylene wax powder, 14%-17% of anhydrous ethanol, 5%-7% of isopropyl alcohol, 0.2%-0.4% of 50% concentration of PC-510 halogen-free flame retardant, 0.01%-0.02% of defoamer, and 2%-4% of thickener.

[0004] Chinese patent CN118185378A: discloses an environmentally friendly water-based ink for green packaging printing and its preparation method, belonging to the technical field of water-based ink. The water-based ink is prepared from the following components by weight: 40-50 parts of bio-based resin, 0.3-0.6 parts of pigment, 0.1-0.4 parts of silicon dioxide, 2-4 parts of coupling agent, 0.1-0.3 parts of defoaming agent, and 0.25-0.5 parts of thickener.

[0005] Chinese patent CN117447870A: relates to the field of printing coating technology, specifically discloses a water-based ink formula and a mixing method, including the following mass fractions: deionized water 208g~384g, water-soluble polyurethane resin 325g~460g, silicone water-based defoamer 2.7g~29g, ethylene glycol dibutyl ether 17g~136g, wetting dispersant 10g~40g, pigment 230g~380g, polyether modified polysiloxane 10g~80g, water-soluble acrylic resin 175g~210g, polyether modified siloxane 0.7g~14g, polyamide mixed wax 3.5g~14g, polyether polyurethane thickener 0.7g~14g and dimethylethylamine 0.7g~14g.

[0006] The adhesion, water resistance and alcohol resistance of the water-based ink prepared by the above patents still need to be further improved. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a method for preparing a bio-based ink of cardanol-modified acrylic resin, and the operating steps are as follows:

[0008] S1: Add 10-15 parts of cardanol, 0.05-0.5 parts of 6,6'-dihydroxy-3,3'-biphenyl dicarboxylic acid / Cu complex, 2-5 parts of triethylamine, and 100-120 parts of dichloromethane solvent to a reaction kettle, stir and mix evenly at room temperature, then slowly dropwise add a mixture of 3-6 parts of acryloyl chloride and 10-20 parts of dichloromethane, react for 2-5 hours, and remove dichloromethane by reduced pressure distillation to obtain a mixture of propylene cardanol ester / propylene biphenyl dicarboxylic acid ester / Cu complex;

[0009] S2: 5-10 parts of a mixture of propylene cardanol ester / propylene biphenyl dicarboxylate / Cu complex, 10-20 parts of methyl methacrylate, 5-10 parts of pentaerythritol tetrathioglycolate, 1-5 parts of acrylic acid, 0.02-0.5 parts of triazine trithiol trisodium salt hydrate, CAS: 188661-09-8, 120-160 parts of toluene, and 0.07-0.6 parts of a photoinitiator are added to a reaction kettle, and irradiated with ultraviolet light, wherein the wavelength of the ultraviolet light is 220-350 nanometers, and the irradiation time is 10-30 minutes; then stirred and reacted at 80-90° C. for 3-6 hours, ammonia water was added dropwise to adjust the pH to 8-10, and toluene was removed by reduced pressure distillation after the reaction was completed to obtain a cardanol modified acrylic resin;

[0010] S3: Disperse 30-45 parts of cardanol-modified acrylic resin, 40-50 parts of deionized water, 1-5 parts of ethanol, 0.1-0.3 parts of pigment, 0.1-0.5 parts of defoaming agent, 0.1-0.5 parts of thickener, and 1-3 parts of coupling agent with a high-speed homogenizer at 500-600 r / min for 10-15 minutes, and then adjust the pH value of the ink to 8-9 with ammonia water to obtain a bio-based ink of cardanol-modified acrylic resin.

[0011] Preferably, the pigment is one of capsanthin, turmeric, carotene, phycocyanin, cocoa pigment and caramel pigment.

[0012] Preferably, the defoaming agent is one of polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether, polydimethylsiloxane, and polyether-modified silicone defoaming agent.

[0013] Preferably, the thickener is one of hydroxyethyl methylcellulose, hydroxypropyl methylcellulose, bentonite, methylcellulose, hydroxyethyl cellulose and hydroxypropyl methylcellulose.

[0014] Preferably, the coupling agent is one of trichlorovinyl silane, triethoxyvinyl silane, γ-aminopropyl triethoxysilane and trichloropropylene silane.

[0015] Preferably, the 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex is prepared by:

[0016] By weight, 19-36 parts of Cu(NO 3 ) 2 As a metal source, 27-54 parts of 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid organic ligand are selected, and 200-300 parts of DMF are used as a reaction solvent. In a stirred kettle, the reaction temperature is 90-100° C., the reaction is carried out under nitrogen protection, and the reaction time is 8-14 hours. The DMF is distilled off to obtain a 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex.

[0017] Preferably, the photoinitiator is one of 2-hydroxy-2-methyl-1-phenylacetone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, and benzoin dimethyl ether.

[0018] Reaction mechanism

[0019] Propylene cardanol ester, propenyl biphenyl dicarboxylate and Cu complex mixture are the core raw materials of this reaction. They react with methyl methacrylate, pentaerythritol tetrathioglycolate, acrylic acid, triazine trithiol trisodium salt hydrate, etc. through thiol-propenyl click chemistry addition reaction; this process not only involves the basic mechanism of click chemistry, but also includes complex organic molecular reorganization.

[0020] Thiol-propylene click chemistry is a fast, efficient and selective chemical reaction, which is often used to quickly construct sulfur-containing polymer networks; thiol-containing compounds and propylene-containing compounds undergo addition reactions through free radical catalysis or photocatalysis to form macromolecular structures connected by thioether bonds.

[0021] Technical Effects

[0022] The present invention discloses a method for preparing a bio-based ink of cardanol-modified acrylic resin. Compared with the prior art, the present invention has the following significant effects:

[0023] 1. Cardanol can not only provide hydrophobic segments, but also form hydrogen bonds or π-π stacking with other raw materials through the phenolic hydroxyl groups on its benzene ring, thereby enhancing the overall stability and mechanical properties of the resin.

[0024] 2. The introduced triazine trithiol trisodium salt hydrate, as a special cross-linking agent, can effectively promote the connection between multiple functional groups, increase the cross-linking density, and improve the durability and mechanical strength of bio-based inks.

[0025] 3. This bio-based ink based on modified acrylic resin is expected to show excellent printing performance and physical properties; the introduction of cardanol increases the hydrophobicity and adhesion of the ink, while the biphenyl structure and Cu complex may give the ink good optical properties and conductive properties; in addition, the polyhydroxy structure of pentaerythritol provides the ink with a very high degree of crosslinking, making it show good scratch resistance and chemical resistance on various substrates. DETAILED DESCRIPTION

[0026] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description in combination with embodiments and comparative examples:

[0027] 1. Adhesion test:

[0028] According to GB / T1720-88 standard, the test was carried out using a QFD electric paint film adhesion tester.

[0029] 2. Water resistance and alcohol resistance test:

[0030] According to QB568, 10 pieces of qualitative filter paper soaked with aqueous solution or anhydrous ethanol are covered on 1 / 2 of the ink film. After adding weights and letting it stand for 24 hours, the grade is evaluated based on the changes in the film.

[0031] Example 1

[0032] A method for preparing a bio-based ink of cardanol-modified acrylic resin, the operating steps of which are as follows:

[0033] S1: Add 10g of cardanol, 0.05g of 6,6'-dihydroxy-3,3'-biphenyl dicarboxylic acid / Cu complex, 2g of triethylamine, and 100g of dichloromethane solvent to a reactor, stir and mix evenly at room temperature, then slowly dropwise add a mixture of 3g of acryloyl chloride and 10g of dichloromethane, react for 2h, and remove dichloromethane by vacuum distillation to obtain a mixture of propylene cardanol ester / propylene biphenyl dicarboxylic acid ester / Cu complex;

[0034] S2: 5g of a mixture of propylene cardanol ester / propylene biphenyl dicarboxylate / Cu complex, 10g of methyl methacrylate, 5g of pentaerythritol tetrathioglycolate, 1g of acrylic acid, 0.02g of triazine trithiol trisodium salt hydrate, CAS: 188661-09-8, 120g of toluene, and 0.07g of a photoinitiator are added to a reaction kettle, and irradiated with ultraviolet light, the wavelength of which is 220 nanometers, and the irradiation time is 10 minutes; then, the mixture is stirred and reacted at 80°C for 3 hours, and ammonia water is added dropwise to adjust the pH to 8. After the reaction is completed, toluene is removed by reduced pressure distillation to obtain a cardanol-modified acrylic resin;

[0035] S3: 30 g of cardanol-modified acrylic resin, 40 g of deionized water, 1 g of ethanol, 0.1 g of pigment, 0.1 g of defoamer, 0.1 g of thickener, and 1 g of coupling agent were dispersed at 500 r / min for 10 min using a high-speed homogenizer, and the pH value of the ink was adjusted to 8 with ammonia water to obtain a bio-based ink of cardanol-modified acrylic resin.

[0036] The pigment is capsicum red.

[0037] The defoaming agent is polyoxypropylene glyceryl ether.

[0038] The thickener is hydroxyethyl methylcellulose.

[0039] The coupling agent is trichlorovinyl silane.

[0040] The 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex is prepared by:

[0041] 19gCu(NO 3 ) 2 As the metal source, 27g of 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid organic ligand was selected, and 200g of DMF was used as the reaction solvent. The reaction temperature was 90°C in a stirred tank, and the reaction was carried out under nitrogen protection for 8 hours. DMF was distilled off to obtain a 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex.

[0042] The photoinitiator is 2-hydroxy-2-methyl-1-phenylacetone.

[0043] Example 2

[0044] A method for preparing a bio-based ink of cardanol-modified acrylic resin, the operating steps of which are as follows:

[0045] S1: Add 12g of cardanol, 0.2g of 6,6'-dihydroxy-3,3'-biphenyl dicarboxylic acid / Cu complex, 3g of triethylamine, and 105g of dichloromethane solvent to a reactor, stir and mix evenly at room temperature, then slowly drop a mixture of 4g of acryloyl chloride and 13g of dichloromethane, react for 3h, and remove dichloromethane by vacuum distillation to obtain a mixture of propylene cardanol ester / propylene biphenyl dicarboxylic acid ester / Cu complex;

[0046] S2: 6g of a mixture of propylene cardanol ester / propylene biphenyl dicarboxylate / Cu complex, 13g of methyl methacrylate, 6g of pentaerythritol tetrathioglycolate, 2g of acrylic acid, 0.2g of triazine trithiol trisodium salt hydrate, CAS: 188661-09-8, 130g of toluene, and 0.2g of a photoinitiator are added to a reaction kettle, and irradiated with ultraviolet light, the wavelength of which is 260 nanometers, and the irradiation time is 15 minutes; then, the mixture is stirred and reacted at 85°C for 4 hours, and ammonia water is added dropwise to adjust the pH to 9. After the reaction is completed, toluene is removed by reduced pressure distillation to obtain a cardanol-modified acrylic resin;

[0047] S3: 35 g of cardanol-modified acrylic resin, 43 g of deionized water, 2 g of ethanol, 0.2 g of pigment, 0.2 g of defoamer, 0.2 g of thickener, and 2 g of coupling agent were dispersed at 550 r / min for 12 min using a high-speed homogenizer, and the pH value of the ink was adjusted to 8 with ammonia water to obtain a bio-based ink of cardanol-modified acrylic resin.

[0048] The pigment is turmeric.

[0049] The defoaming agent is polyoxypropylene polyoxyethylene glycerol ether.

[0050] The thickener is hydroxypropyl methylcellulose.

[0051] The coupling agent is triethoxyvinylsilane.

[0052] The 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex is prepared by:

[0053] 25gCu(NO 3 ) 2 As the metal source, 32 g of 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid organic ligand was selected, and 240 g of DMF was used as the reaction solvent. The reaction was carried out in a stirred tank at a reaction temperature of 95°C under nitrogen protection for 10 hours. DMF was distilled off to obtain a 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex.

[0054] The photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.

[0055] Example 3

[0056] A method for preparing a bio-based ink of cardanol-modified acrylic resin, the operating steps of which are as follows:

[0057] S1: Add 14g of cardanol, 0.4g of 6,6'-dihydroxy-3,3'-biphenyl dicarboxylic acid / Cu complex, 4g of triethylamine, and 115g of dichloromethane solvent to a reactor, stir and mix evenly at room temperature, then slowly dropwise add a mixture of 5g of acryloyl chloride and 18g of dichloromethane, react for 4h, and remove dichloromethane by vacuum distillation to obtain a mixture of propylene cardanol ester / propylene biphenyl dicarboxylic acid ester / Cu complex;

[0058] S2: 8g of a mixture of propylene cardanol ester / propylene biphenyl dicarboxylate / Cu complex, 18g of methyl methacrylate, 8g of pentaerythritol tetrathioglycolate, 4g of acrylic acid, 0.4g of triazine trithiol trisodium salt hydrate, CAS: 188661-09-8, 150g of toluene, and 0.5g of a photoinitiator are added to a reaction kettle, and irradiated with ultraviolet light, the wavelength of which is 330 nanometers, and the irradiation time is 25 minutes; then, the mixture is stirred and reacted at 85°C for 5 hours, and ammonia water is added dropwise to adjust the pH to 9. After the reaction is completed, toluene is removed by reduced pressure distillation to obtain a cardanol-modified acrylic resin;

[0059] S3: 40 g of cardanol-modified acrylic resin, 48 g of deionized water, 4 g of ethanol, 0.2 g of pigment, 0.4 g of defoamer, 0.4 g of thickener, and 2 g of coupling agent were dispersed at 550 r / min for 14 min using a high-speed homogenizer, and the pH value of the ink was adjusted to 9 with ammonia water to obtain a bio-based ink of cardanol-modified acrylic resin.

[0060] The pigment is carotene.

[0061] The defoaming agent is polydimethylsiloxane.

[0062] The thickener is bentonite.

[0063] The coupling agent is γ-aminopropyltriethoxysilane.

[0064] The 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex is prepared by:

[0065] 30gCu(NO 3 ) 2As the metal source, 48g of 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid organic ligand was selected, and 280g of DMF was used as the reaction solvent. The reaction temperature was 95°C in a stirred kettle. The reaction was carried out under nitrogen protection for 12 hours. DMF was distilled off to obtain a 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex.

[0066] The photoinitiator is 2,4,6-trimethylbenzoyl-diphenylphosphine oxide.

[0067] Example 4

[0068] A method for preparing a bio-based ink of cardanol-modified acrylic resin, the operating steps of which are as follows:

[0069] S1: Add 15g of cardanol, 0.5g of 6,6'-dihydroxy-3,3'-biphenyl dicarboxylic acid / Cu complex, 5g of triethylamine, and 120g of dichloromethane solvent to a reactor, stir and mix evenly at room temperature, then slowly drop a mixture of 6g of acryloyl chloride and 20g of dichloromethane, react for 5h, and remove dichloromethane by vacuum distillation to obtain a mixture of propylene cardanol ester / propylene biphenyl dicarboxylic acid ester / Cu complex;

[0070] S2: 10g of a mixture of propylene cardanol ester / propylene biphenyl dicarboxylate / Cu complex, 20g of methyl methacrylate, 10g of pentaerythritol tetrathioglycolate, 5g of acrylic acid, 0.05g of triazine trithiol trisodium salt hydrate, CAS: 188661-09-8, 160g of toluene, and 0.6g of a photoinitiator are added to a reaction kettle, and irradiated with ultraviolet light, wherein the wavelength of the ultraviolet light is 350 nanometers, and the irradiation time is 30 minutes; then, the mixture is stirred and reacted at 90°C for 6 hours, and ammonia water is added dropwise to adjust the pH to 10. After the reaction is completed, toluene is removed by reduced pressure distillation to obtain a cardanol-modified acrylic resin;

[0071] S3: 45 g of cardanol-modified acrylic resin, 50 g of deionized water, 5 g of ethanol, 0.3 g of pigment, 0.5 g of defoamer, 0.5 g of thickener, and 3 g of coupling agent were dispersed at 600 r / min for 15 min using a high-speed homogenizer, and the pH value of the ink was adjusted to 9 with ammonia water to obtain a bio-based ink of cardanol-modified acrylic resin.

[0072] The pigment is caramel pigment.

[0073] The defoamer is a polyether modified organic silicon defoamer.

[0074] The thickener is hydroxypropyl methylcellulose.

[0075] The coupling agent is trichloropropylene silane.

[0076] The 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex is prepared by:

[0077] 36gCu(NO 3 ) 2 As the metal source, 54 g of 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid organic ligand was selected, and 300 g of DMF was used as the reaction solvent. The reaction temperature was 100° C. in a stirred kettle. The reaction was carried out under nitrogen protection for 14 hours. DMF was distilled off to obtain a 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex.

[0078] The photoinitiator is benzoin dimethyl ether.

[0079] Comparative Example 1

[0080] The 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex was not added, and the other steps were the same as in Example 1.

[0081] Comparative Example 2

[0082] Pentaerythritol tetrathioglycolate was not added, and the other steps were the same as in Example 1.

[0083] Comparative Example 3

[0084] The other steps were the same as in Example 1 except that triazine trithiol trisodium salt hydrate was not added.

[0085] Adhesion / Grade Water resistance / grade Alcohol resistance / grade Example 1 2 3 2 Example 2 2 2 2 Example 3 1 2 1 Example 4 1 2 1 Comparative Example 1 5 5 5 Comparative Example 2 3 4 3 Comparative Example 3 3 4 3

[0086] Through the data analysis of the above examples and comparative examples, the bio-based ink prepared by the present invention has a high adhesion level and excellent water resistance and alcohol resistance.

[0087] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a bio-based ink of cardanol-modified acrylic resin, the operating steps of which are: S1: Add 10-15 parts of cardanol, 0.05-0.5 parts of 6,6'-dihydroxy-3,3'-biphenyl dicarboxylic acid / Cu complex, 2-5 parts of triethylamine, and 100-120 parts of dichloromethane solvent to a reaction kettle, stir and mix evenly at room temperature, then slowly dropwise add a mixture of 3-6 parts of acryloyl chloride and 10-20 parts of dichloromethane, react for 2-5 hours, and remove dichloromethane by reduced pressure distillation to obtain a mixture of propylene cardanol ester / propylene biphenyl dicarboxylic acid ester / Cu complex; S2: 5-10 parts of a mixture of propylene cardanol ester / propylene biphenyl dicarboxylate / Cu complex, 10-20 parts of methyl methacrylate, 5-10 parts of pentaerythritol tetrathioglycolate, 1-5 parts of acrylic acid, 0.02-0.5 parts of triazine trithiol trisodium salt hydrate, CAS: 188661-09-8, 120-160 parts of toluene, and 0.07-0.6 parts of a photoinitiator are added to a reaction kettle, and irradiated with ultraviolet light, wherein the wavelength of the ultraviolet light is 220-350 nanometers, and the irradiation time is 10-30 minutes; then stirred and reacted at 80-90° C. for 3-6 hours, ammonia water was added dropwise to adjust the pH to 8-10, and toluene was removed by reduced pressure distillation after the reaction was completed to obtain a cardanol modified acrylic resin; S3: Disperse 30-45 parts of cardanol-modified acrylic resin, 40-50 parts of deionized water, 1-5 parts of ethanol, 0.1-0.3 parts of pigment, 0.1-0.5 parts of defoaming agent, 0.1-0.5 parts of thickener, and 1-3 parts of coupling agent with a high-speed homogenizer at 500-600 r / min for 10-15 minutes, and then adjust the pH value of the ink to 8-9 with ammonia water to obtain a bio-based ink of cardanol-modified acrylic resin.

2. The method for preparing a bio-based ink of cardanol-modified acrylic resin according to claim 1, characterized in that: The pigment is one of capsicum red, turmeric, carotene, phycocyanin, cocoa pigment and caramel pigment.

3. The method for preparing a bio-based ink of cardanol-modified acrylic resin according to claim 1, characterized in that: The defoaming agent is one of polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether, polydimethylsiloxane, and polyether-modified organic silicon defoaming agent.

4. The method for preparing a bio-based ink of cardanol-modified acrylic resin according to claim 1, characterized in that: The thickener is one of hydroxyethyl methylcellulose, hydroxypropyl methylcellulose, bentonite, methylcellulose, hydroxyethyl cellulose and hydroxypropyl methylcellulose.

5. The method for preparing a bio-based ink of cardanol-modified acrylic resin according to claim 1, characterized in that: The coupling agent is one of trichlorovinyl silane, triethoxyvinyl silane, γ-aminopropyl triethoxysilane and trichloropropylene silane.

6. The method for preparing a bio-based ink of cardanol-modified acrylic resin according to claim 1, characterized in that: The 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex is prepared by: By weight, 19-36 parts of Cu(NO3)2 are used as metal sources, 27-54 parts of 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid organic ligands are selected, and 200-300 parts of DMF are used as reaction solvents. The reaction temperature is 90-100°C in a stirred kettle. The reaction is carried out under nitrogen protection for 8-14 hours. DMF is removed by distillation to obtain a 6,6'-dihydroxy-3,3'-biphenyldicarboxylic acid / Cu complex.

7. The method for preparing a bio-based ink of cardanol-modified acrylic resin according to claim 1, characterized in that: The photoinitiator is one of 2-hydroxy-2-methyl-1-phenylacetone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and benzoin dimethyl ether.