UV curing decorative paper ink and preparation method thereof

Abstract

The invention discloses UV curing decorative paper ink and a preparation method thereof, and belongs to the technical field of decorative materials. The coating is prepared from the following raw materials: 10 to 20 parts of polyurethane acrylic resin, 20 to 25 parts of polyethylene glycol dicarboxylic acid, 10 to 20 parts of quaternary ammonium salt modified cyclodextrin, 10 to 20 parts of pigment, 1 to 4 parts of carbon tetrabromide, 2 to 6 parts of photoinitiator, 5 to 15 parts of reactive diluent, 0.5 to 2 parts of flatting agent and 0.5 to 1 part of XT-114 organic silicon defoaming agent. The UV curing decorative paper ink prepared by the invention has the advantages of stable performance, bright color, high curing speed, strong adhesive force, good flexibility and excellent lasting antistatic performance.

Description

Technical Field

[0001] The invention belongs to the technical field of decorative materials, and in particular is a UV curing decorative paper ink and a preparation method thereof. Background Art

[0002] As a multifunctional surface treatment material, decorative paper provides beautiful and personalized decorative effects for various products and spaces with its rich colors, diverse textures and patterns. It can not only enhance the appearance of the product, but also enhance the market competitiveness of the product by imitating the texture of natural materials such as wood grain, stone or metal. As a surface treatment material, decorative paper itself is composed of various types of cellulose polymers. The use of various types of inks is of irreplaceable importance to the realization of its functional value. Due to the use scenarios of decorative paper materials, the ink used should have the characteristics of good adhesion, bright colors and not easy to fade. UV light curing ink has great advantages in these aspects.

[0003] UV light-curing ink is a kind of ink that uses ultraviolet light of different wavelengths and energies to form a film and dry the ink under ultraviolet light. It occupies an important position in the printing industry due to its fast curing characteristics. It can achieve instant drying through ultraviolet light irradiation, greatly improving production efficiency and reducing energy consumption and environmental pollution. However, UV light-curing ink has some defects, such as low adhesion of ink, poor antistatic effect, easy accumulation of static charge on the surface, color stability and durability. Therefore, it is of great significance to improve the performance of UV curing decorative paper ink through further research and improvement. Summary of the invention

[0004] To solve the above problems, the object of the present invention is to provide a UV curing decorative paper ink and a preparation method thereof.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions: A UV curing decorative paper ink is composed of the following raw materials, measured in parts by weight: 10-20 parts of polyurethane acrylic resin, 20-25 parts of polyethylene glycol dicarboxylic acid, 10-20 parts of quaternary ammonium salt-modified cyclodextrin, 10-20 parts of pigment, 1-4 parts of carbon tetrabromide, 2-6 parts of photoinitiator, 5-15 parts of active diluent, 0.5-2 parts of leveling agent, and 0.5-1 parts of XT-114 silicone defoamer.

[0006] The molecular weight of the polyethylene glycol dicarboxylic acid is less than 700.

[0007] The photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone or 2,4-diethylthioxanthone.

[0008] The leveling agent is BYK-333 or BYK-3510.

[0009] The active diluent is trimethylolpropane triacrylate or 1,6-hexanediol diacrylate.

[0010] The pigment is one or two of rhodamine B, Sudan red dyes, coumarin, cyanine dyes, fluorescein, phthalocyanine blue, phthalocyanine green and isoindolinone.

[0011] The quaternary ammonium salt-modified cyclodextrin is prepared according to the following steps: 1) Add 2-bromoethylamine and di-tert-butyl dicarbonate to an organic solvent 1, then add an alkaline salt thereto, and react at 25-30° C. for 6-8 hours. After the reaction is completed, remove the solvent by distillation under reduced pressure, and wash the obtained residue 2-3 times with a 1-3 mol / L alkaline salt solution to obtain amino-protected bromoethylamine; 2) adding the amino-protected bromoethylamine and cyclodextrin obtained in step 1) to an organic solvent 2, and then adding sodium hydride thereto, stirring and mixing evenly, heating to 80-100° C. to react for 12-24 hours, and after the reaction is completed, adding an alcohol solvent to quench the reaction, and after removing the solvent by distillation under reduced pressure, washing the obtained residue with water for 3-5 times, and drying to obtain an amino-protected cyclodextrin derivative; 3) Add the amino-protected cyclodextrin derivative obtained in step 2) into water, then add trifluoroacetic acid thereto, react at 25-40° C. for 5-8 hours. After the reaction is completed, evaporate the water, add the obtained residue into organic solvent 2, then add iodomethane, react at 80-110° C. for 15-30 hours. After the reaction is completed, remove the solvent by reduced pressure distillation to obtain quaternary ammonium salt-modified cyclodextrin.

[0012] In step 1), the organic solvent 1 is chloroform or dichloromethane.

[0013] The alkaline salt in step 1) is sodium carbonate or potassium carbonate.

[0014] The mass ratio of 2-bromoethylamine, di-tert-butyl dicarbonate, organic solvent 1 and alkaline salt in step 1) is 1:2-3.5:10-15:1-1.5.

[0015] In step 2), the organic solvent 2 is dimethylformamide or dimethyl sulfoxide.

[0016] The alcohol solvent in step 2) is methanol, ethanol, isopropanol or tert-butanol.

[0017] The mass ratio of the amino-protected bromoethylamine, cyclodextrin, organic solvent 2, sodium hydride and alcohol solvent in step 2) is 1:2~5:10~15:0.2~0.5:5~10.

[0018] In step 3), the mass ratio of the amino-protected cyclodextrin derivative, water, trifluoroacetic acid, organic solvent 2 and iodomethane is 1:5-10:0.2-0.4:5-10:0.8-1.2.

[0019] The method for preparing the UV curable decorative paper ink comprises the following steps: In parts by weight, 15 to 20 parts of polyurethane acrylic resin, 20 to 25 parts of polyethylene glycol dicarboxylic acid, 10 to 20 parts of quaternary ammonium salt-modified cyclodextrin, 10 to 15 parts of pigment and 5 to 15 parts of active diluent are added to a reactor and stirred for 20 to 30 minutes. Then, 0.5 to 2 parts of leveling agent and 0.5 to 1 part of XT-114 silicone defoamer are added thereto and stirred for 1 to 2 hours. Then, 1 to 4 parts of carbon tetrabromide and 2 to 6 parts of photoinitiator are added and stirred for 40 to 50 minutes to obtain UV-curable decorative paper ink.

[0020] Compared with the prior art, the present invention has the following advantages: The UV curing decorative paper ink of the present invention uses polyethylene glycol dicarboxylic acid to undergo curing and crosslinking with quaternary ammonium salt-modified cyclodextrin under the action of ultraviolet light, so that the prepared ink has high flexibility and reduces the phenomenon of ink cracking or falling off on a curved or twisted surface; on the other hand, it can undergo esterification and crosslinking with the hydroxyl group of the decorative paper substrate layer, thereby increasing the adhesion of the ink; the cavity structure of the cyclodextrin can wrap the pigment inside, so that it is not easy for the pigment molecules to aggregate and stack, thereby improving the dispersion stability of the pigment and increasing the stability and durability of the pigment in the UV curing decorative paper ink; the quaternary ammonium salt is combined with the cyclodextrin in a covalently linked manner, thereby participating in the polymerization and crosslinking reaction, reducing the migration and exudation of the antistatic agent, and increasing the antistatic effect of the UV curing decorative paper ink. In addition, using polyurethane acrylic resin as the substrate of the ink can increase the viscosity of the ink, increase the viscosity, and increase the uniformity of the ink application.

[0021] The UV curing decorative paper ink of the present invention reduces the use of raw materials containing unsaturated and conjugated functional groups, improves the transparency of the ink, and has stable performance, bright colors, fast curing speed, strong adhesion, good flexibility and excellent long-lasting antistatic performance. DETAILED DESCRIPTION

[0022] In order to better understand the technical solution of the present invention, the above content of the present invention is further described in detail below through specific implementation methods in the form of embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples. All technologies realized based on the above content of the present invention belong to the scope of the present invention.

[0023] Example 1 Preparation of quaternary ammonium salt modified cyclodextrin: 0.1 kg of 2-bromoethylamine and 0.2 kg of di-tert-butyl dicarbonate were added to 1 kg of chloroform, and then 0.1 kg of sodium carbonate was added thereto, and the reaction was carried out at 25° C. for 8 hours. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the obtained residue was washed twice with a 1 mol / L sodium carbonate aqueous solution to obtain amino-protected bromoethylamine; 1 H NMR (300 MHz, DMSO- d 6, 293 K): δ6.69 (s, 1H), 3.77 (t, 4H), 1.45 (s, 9H).

[0024] 0.1 kg of amino-protected bromoethylamine and 0.2 kg of cyclodextrin were added to 1 kg of dimethylformamide, and 0.02 kg of sodium hydride was added thereto, and the mixture was stirred and mixed evenly, and heated to 80° C. for reaction for 24 hours. After the reaction was completed, 0.5 kg of methanol was added to quench the reaction, and the solvent was removed by distillation under reduced pressure. The residue was washed with water 3 times and dried to obtain an amino-protected cyclodextrin derivative; 0.1 kg of amino-protected cyclodextrin derivative was added into 0.5 kg of water, and then 0.02 kg of trifluoroacetic acid was added thereto, and the mixture was reacted at 25°C for 8 hours. After the reaction was completed, the water was evaporated, and the residue was added into 0.5 kg of dimethylformamide, and then 0.08 kg of iodomethane was added thereto, and the mixture was reacted at 80°C for 30 hours. After the reaction was completed, the solvent was removed by distillation under reduced pressure to obtain quaternary ammonium salt-modified cyclodextrin.

[0025] Preparation of UV curing decorative paper ink: 1.5 kg of polyurethane acrylic resin, 2 kg of polyethylene glycol dicarboxylic acid, 1 kg of quaternary ammonium salt-modified cyclodextrin, 1 kg of coumarin and 0.5 kg of trimethylolpropane triacrylate were added into a reactor and stirred for 20 min. Then, 0.05 kg of leveling agent BYK-333 and 0.05 kg of XT-114 silicone defoamer were added thereto. After stirring for 1 h, 0.1 kg of carbon tetrabromide and 0.2 kg of 2-hydroxy-2-methyl-1-phenyl-1-propanone were added and stirred for 40 min to obtain UV-curable decorative paper ink.

[0026] Example 2 Preparation of quaternary ammonium salt modified cyclodextrin: 0.1 kg of 2-bromoethylamine and 0.23 kg of di-tert-butyl dicarbonate were added to 1.1 kg of dichloromethane, and then 0.11 kg of sodium carbonate was added thereto, and the mixture was reacted at 26° C. for 7.5 hours. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the residue was washed three times with a 1.5 mol / L sodium carbonate aqueous solution to obtain amino-protected bromoethylamine; 0.1 kg of amino-protected bromoethylamine and 0.3 kg of cyclodextrin were added to 1.1 kg of dimethyl sulfoxide, and then 0.03 kg of sodium hydride was added thereto, and the mixture was stirred and mixed evenly, and heated to 85° C. for reaction for 20 hours. After the reaction was completed, 0.6 kg of ethanol was added to quench the reaction, and the solvent was removed by distillation under reduced pressure. The residue was washed with water 5 times and dried to obtain an amino-protected cyclodextrin derivative; 0.1 kg of amino-protected cyclodextrin derivative was added into 0.6 kg of water, and then 0.025 kg of trifluoroacetic acid was added thereto, and the mixture was reacted at 30°C for 7 hours. After the reaction was completed, the water was evaporated, and the residue was added into 0.6 kg of dimethyl sulfoxide, and then 0.09 kg of iodomethane was added thereto, and the mixture was reacted at 90°C for 25 hours. After the reaction was completed, the solvent was removed by distillation under reduced pressure to obtain quaternary ammonium salt-modified cyclodextrin.

[0027] Preparation of UV curing decorative paper ink: 1.6 kg of polyurethane acrylic resin, 2.1 kg of polyethylene glycol dicarboxylic acid, 1.3 kg of quaternary ammonium salt-modified cyclodextrin, 1.1 kg of fluorescein and 0.8 kg of 1,6-hexanediol diacrylate were added into a reactor and stirred for 25 minutes. Then, 0.09 kg of leveling agent BYK-3510 and 0.06 kg of XT-114 silicone defoamer were added thereto. After stirring for 1.2 hours, 0.2 kg of carbon tetrabromide and 0.3 kg of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone were added. The mixture was stirred for 42 minutes to obtain UV-curable decorative paper ink.

[0028] Example 3 Preparation of quaternary ammonium salt modified cyclodextrin: 0.1 kg of 2-bromoethylamine and 0.28 kg of di-tert-butyl dicarbonate were added to 1.3 kg of chloroform, and then 0.12 kg of potassium carbonate was added thereto, and the reaction was carried out at 27° C. for 7 hours. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the obtained residue was washed twice with a 1.5 mol / L potassium carbonate aqueous solution to obtain amino-protected bromoethylamine; 0.1 kg of amino-protected bromoethylamine and 0.4 kg of cyclodextrin were added to 1.3 kg of dimethylformamide, and 0.035 kg of sodium hydride was added thereto, and the mixture was stirred and mixed evenly, and heated to 90° C. for reaction for 18 hours. After the reaction was completed, 0.8 kg of isopropanol was added to quench the reaction, and the solvent was removed by distillation under reduced pressure. The residue was washed with water 5 times and dried to obtain an amino-protected cyclodextrin derivative; 0.1 kg of amino-protected cyclodextrin derivative was added to 0.7 kg of water, and then 0.03 kg of trifluoroacetic acid was added thereto, and the reaction was carried out at 35°C for 6 hours. After the reaction was completed, the water was evaporated, and the residue was added to 0.7 kg of dimethylformamide, and then 0.1 kg of iodomethane was added, and the reaction was carried out at 100°C for 20 hours. After the reaction was completed, the solvent was removed by reduced pressure distillation to obtain quaternary ammonium salt-modified cyclodextrin.

[0029] Preparation of UV curing decorative paper ink: 1.8 kg of polyurethane acrylic resin, 2.3 kg of polyethylene glycol dicarboxylic acid, 1.5 kg of quaternary ammonium salt-modified cyclodextrin, 1.2 kg of phthalocyanine green and 1 kg of 1,6-hexanediol diacrylate were added to the reactor and stirred for 28 minutes. Then, 0.14 kg of leveling agent BYK-333 and 0.08 kg of XT-114 silicone defoamer were added thereto. After stirring for 1.5 hours, 0.3 kg of carbon tetrabromide and 0.4 kg of 2,4-diethylthioxanthone were added and stirred for 45 minutes to obtain UV-curable decorative paper ink.

[0030] Example 4 Preparation of quaternary ammonium salt modified cyclodextrin: 0.1 kg of 2-bromoethylamine and 0.33 kg of di-tert-butyl dicarbonate were added to 1.4 kg of chloroform, and then 0.14 kg of potassium carbonate was added thereto, and the reaction was carried out at 28° C. for 6.5 hours. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the residue was washed three times with a 2.5 mol / L potassium carbonate aqueous solution to obtain amino-protected bromoethylamine; 0.1 kg of amino-protected bromoethylamine and 0.4 kg of cyclodextrin were added to 1.4 kg of dimethylformamide, and then 0.045 kg of sodium hydride was added thereto, and the mixture was stirred and mixed evenly, and heated to 95° C. for reaction for 15 hours. After the reaction was completed, 0.9 kg of tert-butanol was added to quench the reaction, and the solvent was removed by distillation under reduced pressure. The residue was washed with water 4 times and dried to obtain an amino-protected cyclodextrin derivative; 0.1 kg of amino-protected cyclodextrin derivative was added to 0.9 kg of water, and then 0.035 kg of trifluoroacetic acid was added thereto, and the reaction was carried out at 38°C for 5.5 hours. After the reaction was completed, the water was evaporated, and the residue was added to 0.9 kg of dimethyl sulfoxide, and then 0.11 kg of iodomethane was added, and the reaction was carried out at 105°C for 18 hours. After the reaction was completed, the solvent was removed by reduced pressure distillation to obtain quaternary ammonium salt-modified cyclodextrin.

[0031] Preparation of UV curing decorative paper ink: 1.9 kg of polyurethane acrylic resin, 2.4 kg of polyethylene glycol dicarboxylic acid, 1.7 kg of quaternary ammonium salt-modified cyclodextrin, 1.4 kg of isoindolinone and 1.3 kg of trimethylolpropane triacrylate were added to the reactor and stirred for 29 minutes. Then, 0.18 kg of leveling agent BYK-3510 and 0.09 kg of XT-114 silicone defoamer were added thereto. After stirring for 1.8 hours, 0.35 kg of carbon tetrabromide and 0.5 kg of 2,4-diethylthioxanthone were added and stirred for 48 minutes to obtain UV-curable decorative paper ink.

[0032] Example 5 Preparation of quaternary ammonium salt modified cyclodextrin: 0.1 kg of 2-bromoethylamine and 0.35 kg of di-tert-butyl dicarbonate were added to 1.5 kg of dichloromethane, and then 0.15 kg of sodium carbonate was added thereto, and the mixture was reacted at 30° C. for 6 hours. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the residue was washed three times with a 3 mol / L sodium carbonate aqueous solution to obtain amino-protected bromoethylamine; 0.1 kg of amino-protected bromoethylamine and 0.5 kg of cyclodextrin were added to 1.5 kg of dimethyl sulfoxide, and then 0.05 kg of sodium hydride was added thereto, and the mixture was stirred and mixed evenly, and heated to 100° C. for 12 hours. After the reaction was completed, 1 kg of methanol was added to quench the reaction, and the solvent was removed by distillation under reduced pressure. The residue was washed with water 5 times and dried to obtain an amino-protected cyclodextrin derivative; 0.1 kg of amino-protected cyclodextrin derivative was added to 1 kg of water, and then 0.04 kg of trifluoroacetic acid was added thereto, and the reaction was carried out at 40°C for 5 hours. After the reaction was completed, the water was evaporated, and the residue was added to 1 kg of dimethyl sulfoxide, and then 0.12 kg of iodomethane was added, and the reaction was carried out at 110°C for 15 hours. After the reaction was completed, the solvent was removed by reduced pressure distillation to obtain quaternary ammonium salt-modified cyclodextrin.

[0033] Preparation of UV curing decorative paper ink: 2 kg of polyurethane acrylic resin, 2.5 kg of polyethylene glycol dicarboxylic acid, 2 kg of quaternary ammonium salt-modified cyclodextrin, 1.5 kg of phthalocyanine blue and 1.5 kg of trimethylolpropane triacrylate were added into a reactor and stirred for 30 minutes. Then, 0.12 kg of leveling agent BYK-3510 and 0.1 kg of XT-114 silicone defoamer were added thereto. After stirring for 2 hours, 0.4 kg of carbon tetrabromide and 0.6 kg of 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone were added and stirred for 50 minutes to obtain UV-curable decorative paper ink.

[0034] Example 6 Preparation of quaternary ammonium salt modified cyclodextrin: 0.1 kg of 2-bromoethylamine and 0.3 kg of di-tert-butyl dicarbonate were added to 1.3 kg of dichloromethane, and then 0.12 kg of sodium carbonate was added thereto, and the reaction was carried out at 30° C. for 8 hours. After the reaction was completed, the solvent was removed by distillation under reduced pressure, and the residue was washed three times with a 2 mol / L sodium carbonate aqueous solution to obtain amino-protected bromoethylamine; 0.1 kg of amino-protected bromoethylamine and 0.4 kg of cyclodextrin were added to 1.3 kg of dimethyl sulfoxide, and then 0.04 kg of sodium hydride was added thereto, and the mixture was stirred and mixed evenly, and heated to 80° C. for reaction for 12 hours. After the reaction was completed, 1 kg of ethanol was added to quench the reaction, and the solvent was removed by distillation under reduced pressure. The residue was washed with water 5 times and dried to obtain an amino-protected cyclodextrin derivative; 0.1 kg of amino-protected cyclodextrin derivative was added to 1 kg of water, and then 0.03 kg of trifluoroacetic acid was added thereto, and the reaction was carried out at 40°C for 8 hours. After the reaction was completed, the water was evaporated, and the residue was added to 1 kg of dimethyl sulfoxide, and then 0.1 kg of iodomethane was added, and the reaction was carried out at 80°C for 15 hours. After the reaction was completed, the solvent was removed by reduced pressure distillation to obtain quaternary ammonium salt-modified cyclodextrin.

[0035] Preparation of UV curing decorative paper ink: 1.5 kg of polyurethane acrylic resin, 2.5 kg of polyethylene glycol dicarboxylic acid, 2 kg of quaternary ammonium salt-modified cyclodextrin, 1 kg of Sudan red dye and 1 kg of 1,6-hexanediol diacrylate were added to the reactor and stirred for 25 minutes. Then, 0.1 kg of leveling agent BYK-333 and 0.1 kg of XT-114 silicone defoamer were added thereto. After stirring for 2 hours, 0.4 kg of carbon tetrabromide and 0.4 kg of 2-hydroxy-2-methyl-1-phenyl-1-propanone were added and stirred for 50 minutes to obtain UV-curable decorative paper ink.

[0036] Decorative paper was printed using the UV curing decorative paper ink prepared in Examples 1 to 6 of the present invention, and then the performance test was performed, wherein the adhesion was tested according to the cross-hatch method in GB / T 13217.7-2023; the aging resistance was tested according to the method in GB / T1865-2009; the flexibility test method was: observing the UV curing decorative paper ink on the surface of the decorative paper through bending and twisting experiments; the antistatic test method was: immediately detecting the surface resistance of the printed decorative paper, and then detecting the surface resistance of the printed decorative paper after 3 months, so as to evaluate the antistatic performance and durability of the UV curing decorative paper ink; the storage stability test method was: storing the UV curing decorative paper ink at 25°C for 6 months, and observing the precipitation and stratification of the UV curing decorative paper ink; the test results are shown in Table 1. It can be seen from the results in Table 1 that the UV curing decorative paper ink prepared by the present invention has strong adhesion, flexibility and aging resistance, and has excellent durable antistatic performance, stable long-term storage performance, and has good application prospects.

[0037] Table 1 Performance parameters of UV curable decorative paper inks prepared in Examples 1 to 6

[0038] Although the above describes the specific implementation methods of the present invention, it does not limit the scope of protection of the present invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A UV curing decorative paper ink, characterized in that: The invention is composed of the following raw materials in parts by weight: 10 to 20 parts of polyurethane acrylic resin, 20 to 25 parts of polyethylene glycol dicarboxylic acid, 10 to 20 parts of quaternary ammonium salt-modified cyclodextrin, 10 to 20 parts of pigment, 1 to 4 parts of carbon tetrabromide, 2 to 6 parts of photoinitiator, 5 to 15 parts of active diluent, 0.5 to 2 parts of leveling agent and 0.5 to 1 part of XT-114 silicone defoamer.

2. The UV curable decorative paper ink according to claim 1, characterized in that: The molecular weight of the polyethylene glycol dicarboxylic acid is less than 700; the photoinitiator is 2-hydroxy-2-methyl-1-phenyl-1-propanone, 2-methyl-1-(4-methylthiophenyl)-2-morpholinyl-1-propanone or 2,4-diethylthioxanthone; the leveling agent is BYK-333 or BYK-3510; and the active diluent is trimethylolpropane triacrylate or 1,6-hexanediol diacrylate.

3. The UV curable decorative paper ink according to claim 1, characterized in that: The pigment is one or two of rhodamine B, Sudan red dyes, coumarin, cyanine dyes, fluorescein, phthalocyanine blue, phthalocyanine green and isoindolinone.

4. The UV curable decorative paper ink according to claim 1, characterized in that: The quaternary ammonium salt-modified cyclodextrin is prepared according to the following steps: 1) Add 2-bromoethylamine and di-tert-butyl dicarbonate to an organic solvent 1, then add an alkaline salt thereto, and react at 25-30° C. for 6-8 hours. After the reaction is completed, remove the solvent by distillation under reduced pressure, and wash the obtained residue 2-3 times with a 1-3 mol / L alkaline salt solution to obtain amino-protected bromoethylamine; 2) adding the amino-protected bromoethylamine and cyclodextrin obtained in step 1) to an organic solvent 2, and then adding sodium hydride thereto, stirring and mixing evenly, heating to 80-100° C. to react for 12-24 hours, and after the reaction is completed, adding an alcohol solvent to quench the reaction, and after removing the solvent by distillation under reduced pressure, washing the obtained residue with water for 3-5 times, and drying to obtain an amino-protected cyclodextrin derivative; 3) Add the amino-protected cyclodextrin derivative obtained in step 2) into water, then add trifluoroacetic acid thereto, react at 25-40° C. for 5-8 hours. After the reaction is completed, evaporate the water, add the obtained residue into organic solvent 2, then add iodomethane, react at 80-110° C. for 15-30 hours. After the reaction is completed, remove the solvent by reduced pressure distillation to obtain quaternary ammonium salt-modified cyclodextrin.

5. The UV curable decorative paper ink according to claim 4, characterized in that: The organic solvent 1 in step 1) is chloroform or dichloromethane; the alkaline salt in step 1) is sodium carbonate or potassium carbonate.

6. The UV curable decorative paper ink according to claim 4, characterized in that: The mass ratio of 2-bromoethylamine, di-tert-butyl dicarbonate, organic solvent 1 and alkaline salt in step 1) is 1:2-3.5:10-15:1-1.

5.

7. The UV curable decorative paper ink according to claim 4, characterized in that: The organic solvent 2 in step 2) is dimethylformamide or dimethyl sulfoxide; the alcohol solvent in step 2) is methanol, ethanol, isopropanol or tert-butanol.

8. The UV curable decorative paper ink according to claim 4, characterized in that: The mass ratio of the amino-protected bromoethylamine, cyclodextrin, organic solvent 2, sodium hydride and alcohol solvent in step 2) is 1:2~5:10~15:0.2~0.5:5~10.

9. The UV curable decorative paper ink according to claim 4, characterized in that: In step 3), the mass ratio of the amino-protected cyclodextrin derivative, water, trifluoroacetic acid, organic solvent 2 and iodomethane is 1:5-10:0.2-0.4:5-10:0.8-1.

2.

10. The method for preparing the UV curable decorative paper ink according to claim 1, characterized in that: The following steps are involved: In parts by weight, 15 to 20 parts of polyurethane acrylic resin, 20 to 25 parts of polyethylene glycol dicarboxylic acid, 10 to 20 parts of quaternary ammonium salt-modified cyclodextrin, 10 to 15 parts of pigment and 5 to 15 parts of active diluent are added to a reactor and stirred for 20 to 30 minutes. Then, 0.5 to 2 parts of leveling agent and 0.5 to 1 part of XT-114 silicone defoamer are added thereto and stirred for 1 to 2 hours. Then, 1 to 4 parts of carbon tetrabromide and 2 to 6 parts of photoinitiator are added and stirred for 40 to 50 minutes to obtain UV-curable decorative paper ink.

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