A high-gloss environmentally friendly UV-curable luminous ink and its preparation method

Abstract

The present invention discloses a high-gloss environmentally friendly UV-curable luminous ink and a preparation method thereof, which belongs to the technical field of UV-curable luminous ink. The ink comprises the following raw materials in parts by weight: 78 to 84 parts of bio-based polyurethane prepolymer, 38 to 45 parts of bio-based acrylate monomer, 10 to 15 parts of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester as UV curing initiator, 11 to 16 parts of luminous powder, 7 to 10 parts of micro powder filler, and 4 to 8 parts of auxiliary agent; the bio-based polyurethane prepolymer is obtained by reacting castor oil, resorcinol, fructose and 1,5-pentamethylene diisocyanate in a weight ratio of 8 to 12:2 to 3:13 to 17:4 to 9. In the above manner, the prepared high-gloss environmentally friendly UV-curable luminous ink is coated on a substrate and then subjected to UV light curing treatment (curing energy 2800mJ / cm 2 ), the thickness of the cured film can be controlled more loosely, and the cured film thickness can be controlled at 8-12μm. The cured film has good coating appearance, friction resistance, stain resistance and gloss.

Description

Technical Field

[0001] The present invention relates to the technical field of UV curable luminous ink, and in particular to a high-gloss and environmentally friendly UV curable luminous ink and a preparation method thereof. Background Art

[0002] UV curing inks are gradually developing in an environmentally friendly direction, such as reducing bisphenol A in inks, increasing renewable bio-based materials (CN114752004B, CN114106349B), reducing the use of petrochemical materials, and thus reducing carbon emissions, reducing pollution to the environment, and achieving green and sustainable development.

[0003] However, the thickness of the cured film is difficult to control. If the amount of ink printed is large, the cured film thickness is large, the surface is relatively rough, the glossiness will be reduced, and it is easy to hide dirt and reduce the stain resistance of the paint film; if the amount of ink printed is small, the cured film thickness is small, and the wear resistance of the cured film is poor.

[0004] Based on this, the present invention designs a high-gloss environmentally friendly UV-curable luminous ink and a preparation method thereof to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a high-gloss environmentally friendly UV-curable luminous ink and a preparation method thereof.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A high-gloss, environmentally friendly UV-curable luminous ink comprises the following raw materials in parts by weight: 78-84 parts of a bio-based polyurethane prepolymer, 38-45 parts of a bio-based acrylate monomer, 10-15 parts of modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate as a UV curing initiator, 11-16 parts of luminous powder, 7-10 parts of a micropowder filler, and 4-8 parts of an additive.

[0008] The bio-based polyurethane prepolymer is obtained by reacting castor oil, resorcinol, fructose and 1,5-pentane diisocyanate in a weight ratio of 8-12:2-3:13-17:4-9;

[0009] The preparation method of modified 2,4,6-trimethylbenzoylphenyl ethyl phosphonate comprises the following steps: blending itaconic acid-based unsaturated polyester and 2,4,6-trimethylbenzoylphenyl ethyl phosphonate, dripping triethylamine, and adjusting the pH to 7.2-7.5.

[0010] Furthermore, the preparation method of the bio-based polyurethane prepolymer is as follows: fructose and resorcinol are mixed, dissolved in 35 to 40 parts of water, heated to 40 to 60°C, stirred until the reactant becomes a colorless transparent liquid, 0.2 to 0.3 parts of NaOH catalyst are added, heated to 55 to 75°C, castor oil and 1,5-pentane diisocyanate are added, stirred until the color becomes a reddish-brown colloid, and then continued to stir for 3 to 4 hours to obtain a bio-based polyurethane prepolymer.

[0011] Furthermore, the mass ratio of the itaconic acid-based unsaturated polyester to ethyl 2,4,6-trimethylbenzoylphenylphosphonate is 6-8:29-41.

[0012] Furthermore, the micropowder filler comprises the following raw materials in parts by weight: 16 to 21 parts of gelatinized starch, 4 to 6 parts of fluorescent powder, 2 to 3 parts of paraffin wax, and 4 to 6 parts of sodium carboxymethyl cellulose.

[0013] Furthermore, the auxiliary agent is a leveling agent.

[0014] Furthermore, the preparation method of the micropowder filler is: after mixing esterified gelatinized starch and sodium carboxymethyl cellulose, bake them at 125-200°C for 1-2 hours, then grind them to 300-400 mesh, add fluorescent powder and paraffin, place them at 50-65°C and stir and mix for 30-40 minutes to obtain the micropowder filler.

[0015] Furthermore, the esterified gelatinized starch is prepared from acetate starch through a starch gelatinization process.

[0016] In order to better achieve the purpose of the present invention, the present invention also provides a method for preparing the high-gloss environmentally friendly UV-curable luminous ink, comprising the following steps:

[0017] 1. Preparation of bio-based polyurethane prepolymer

[0018] Fructose and resorcinol are mixed and dissolved in 35-40 parts of water, the temperature is raised to 40-60°C, and the reaction mixture is stirred until the reaction mixture becomes a colorless transparent liquid. 0.2-0.3 parts of NaOH catalyst are added, the temperature is raised to 55-75°C, castor oil and 1,5-pentane diisocyanate are added, and the mixture is stirred until the color becomes a reddish-brown gel. The mixture is then stirred for 3-4 hours to obtain a bio-based polyurethane prepolymer.

[0019] 2. Preparation of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester

[0020] Itaconic acid-based unsaturated polyester and ethyl 2,4,6-trimethylbenzoylphenylphosphonate are blended, triethylamine is added dropwise, and the pH is adjusted to 7.2-7.5;

[0021] 3. Preparation of micropowder filler

[0022] The esterified gelatinized starch and sodium carboxymethyl cellulose are mixed and baked at 125-200°C for 1-2 hours, then ground into 300-400 mesh, and fluorescent powder and paraffin are added, and the mixture is stirred at 50-65°C for 30-40 minutes to obtain a micropowder filler.

[0023] 4. Mix the bio-based polyurethane prepolymer, bio-based acrylate monomer and micropowder filler, stir and react at 65-70°C for 5-6 hours, add modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, luminous powder and additives, stir and react at 45-60°C for 0.5-1 hour to obtain high-gloss environmentally friendly UV-curable luminous ink.

[0024] Furthermore, the weight ratio of castor oil, resorcinol, fructose and 1,5-pentanediisocyanate is 8-12:2-3:13-17:4-9; the mass ratio of itaconic acid unsaturated polyester and 2,4,6-trimethylbenzoylphenyl ethyl phosphonate is 6-8:29-41.

[0025] Furthermore, the micropowder filler comprises the following raw materials in parts by weight: 16 to 21 parts of gelatinized starch, 4 to 6 parts of fluorescent powder, 2 to 3 parts of paraffin wax, and 4 to 6 parts of sodium carboxymethyl cellulose.

[0026] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses bio-based polyurethane prepolymer and modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester with low biotoxicity as a photoinitiator, while improving the filler, thereby reducing pollution to the environment and making the product more environmentally friendly.

[0027] 2. The present invention modifies ethyl 2,4,6-trimethylbenzoylphenylphosphonate with an itaconic acid-based unsaturated polyester to obtain modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate. A bio-based polyurethane prepolymer is obtained by reacting castor oil, resorcinol, fructose, and 1,5-pentanediisocyanate. A micropowder filler is prepared by esterifying gelatinized starch, sodium carboxymethyl cellulose, fluorescent powder, and paraffin wax. The modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate effectively improves adhesion, coating appearance, stain resistance / grade, gloss, and hardness. This may be due to the self-healing function of the itaconic acid-based unsaturated polyester, which facilitates the formation of a smooth film appearance. Furthermore, the grafting modification with ethyl 2,4,6-trimethylbenzoylphenylphosphonate increases the molecular weight and density of the three-dimensional network structure, resulting in enhanced performance. The addition of esterified gelatinized starch further enhances crosslinking strength, increasing the bonding tightness and strength of the micropowder filler, thereby enhancing performance.

[0028] 3. Apply the prepared high gloss environmentally friendly UV curable luminous ink on the substrate, and then cure it with UV light (curing energy 2800mJ / cm2 ), the thickness of the cured film can be controlled more loosely, and the thickness of the cured film can be controlled at 8-12μm. The cured film has good adhesion, coating appearance, friction resistance, stain resistance, gloss and hardness. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: In some embodiments, a method for preparing a high-gloss environmentally friendly UV-curable luminous ink comprises the following steps:

[0031] 1. Preparation of bio-based polyurethane prepolymer

[0032] 13 parts of fructose and 3 parts of resorcinol were mixed and dissolved in 35 parts of water, the temperature was raised to 60°C, and the mixture was stirred until the reactant became a colorless transparent liquid. 0.2 parts of NaOH catalyst was added, the mixture was heated to 75°C, and 8 parts of castor oil and 9 parts of 1,5-pentanediisocyanate were added. The mixture was stirred until the color became a reddish-brown gel, and the stirring was continued for 3 hours to obtain a bio-based polyurethane prepolymer.

[0033] 2. Preparation of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester

[0034] Blend 6 parts of itaconic acid-based unsaturated polyester with 41 parts of ethyl 2,4,6-trimethylbenzoylphenylphosphonate, add triethylamine dropwise, and adjust the pH to 7.2;

[0035] 3. Preparation of micropowder filler

[0036] Mix 16 parts of esterified gelatinized starch and 6 parts of sodium carboxymethyl cellulose, bake at 125°C for 2 hours, grind to 300 mesh, add 6 parts of phosphor and 2 parts of paraffin, stir and mix at 65°C for 30 minutes, and obtain a micropowder filler.

[0037] The esterified gelatinized starch is prepared from acetate starch through a traditional starch gelatinization process.

[0038] Fourth, mix 78 parts of a bio-based polyurethane prepolymer, 45 parts of a bio-based acrylate monomer (the bio-based acrylate monomer is from CN114423731B), and 7 parts of a micropowder filler. Stir and react at 70°C for 5 hours. Add 15 parts of modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 11 parts of luminescent powder, and 8 parts of a leveling agent. Stir and react at 45°C for 1 hour to obtain a high-gloss, environmentally friendly UV-curable luminescent ink.

[0039] The prepared high gloss environmentally friendly UV curable luminous ink was coated on a substrate (20 cm × 30 cm) and then cured by UV light (curing energy 2800 mJ / cm 2 ), the cured film thickness is 8μm. Performance test of the cured film:

[0040] Adhesion (ASTM D 3359-2002): 5B;

[0041] Coating appearance (visual inspection): smooth and without abnormalities;

[0042] Friction resistance (GB / T 7706-2008): 782 times;

[0043] Stain resistance / level (EN 438-2-2016): 4;

[0044] Gloss (GB / T 9754-2007): 94.9 (60°);

[0045] Hardness (GB / T 6739-2022): 5H.

[0046] Example 2: In some embodiments, a method for preparing a high-gloss environmentally friendly UV-curable luminous ink comprises the following steps:

[0047] 1. Preparation of bio-based polyurethane prepolymer

[0048] 17 parts of fructose and 2 parts of resorcinol were mixed and dissolved in 40 parts of water, the temperature was raised to 40°C, and the mixture was stirred until the reactant became a colorless transparent liquid. 0.3 parts of NaOH catalyst was added, the mixture was heated to 55°C, and 12 parts of castor oil and 4 parts of 1,5-pentanediisocyanate were added. The mixture was stirred until the color became a reddish-brown gel, and the stirring was continued for 4 hours to obtain a bio-based polyurethane prepolymer.

[0049] 2. Preparation of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester

[0050] 8 parts of itaconic acid-based unsaturated polyester and 29 parts of ethyl 2,4,6-trimethylbenzoylphenylphosphonate were blended, triethylamine was added dropwise, and the pH was adjusted to 7.5;

[0051] 3. Preparation of micropowder filler

[0052] Mix 21 parts of esterified gelatinized starch and 4 parts of sodium carboxymethyl cellulose, bake at 200°C for 1 hour, grind to 400 mesh, add 4 parts of phosphor and 3 parts of paraffin, stir and mix at 50°C for 40 minutes to obtain a micropowder filler;

[0053] The esterified gelatinized starch is prepared from acetate starch through a traditional starch gelatinization process.

[0054] Fourth, mix 84 parts of a bio-based polyurethane prepolymer, 38 parts of a bio-based acrylate monomer (from CN114423731B), and 10 parts of a micropowder filler. Stir and react at 65°C for 6 hours. Add 10 parts of modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 16 parts of luminescent powder, and 4 parts of a leveling agent. Stir and react at 60°C for 0.5 hours to obtain a high-gloss, environmentally friendly UV-curable luminescent ink.

[0055] The prepared high gloss environmentally friendly UV curable luminous ink was coated on a substrate (20 cm × 30 cm) and then cured by UV light (curing energy 2800 mJ / cm 2 ), the cured film thickness is 10 μm. Performance test of the cured film:

[0056] Adhesion (ASTM D 3359-2002): 5B;

[0057] Coating appearance (visual inspection): smooth and without abnormalities;

[0058] Friction resistance (GB / T 7706-2008): 801 times;

[0059] Stain resistance / level (EN 438-2-2016): 4;

[0060] Gloss (GB / T 9754-2007): 96.3 (60°);

[0061] Hardness (GB / T 6739-2022): 5H.

[0062] Example 3: In some embodiments, a method for preparing a high-gloss environmentally friendly UV-curable luminous ink comprises the following steps:

[0063] 1. Preparation of bio-based polyurethane prepolymer

[0064] 15 parts of fructose and 2.6 parts of resorcinol were mixed and dissolved in 38 parts of water, the temperature was raised to 50°C, and the mixture was stirred until the reactant became a colorless transparent liquid. 0.25 parts of NaOH catalyst was added, the mixture was heated to 65°C, and 10.5 parts of castor oil and 6.6 parts of 1,5-pentanediisocyanate were added. The mixture was stirred until the color became a reddish-brown gel, and the stirring was continued for 3.8 hours to obtain a bio-based polyurethane prepolymer.

[0065] 2. Preparation of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester

[0066] Blend 6.5 parts of itaconic acid-based unsaturated polyester and 31 parts of ethyl 2,4,6-trimethylbenzoylphenylphosphonate, add triethylamine dropwise, and adjust the pH to 7.3;

[0067] 3. Preparation of micropowder filler

[0068] 18 parts of esterified gelatinized starch and 4.6 parts of sodium carboxymethyl cellulose were mixed and baked at 175°C for 1.6 hours, then ground into 350 mesh, 5 parts of phosphor and 2.2 parts of paraffin were added, and the mixture was stirred at 55°C for 36 minutes to obtain a micropowder filler;

[0069] The esterified gelatinized starch is prepared from acetate starch through a traditional starch gelatinization process.

[0070] Fourth, mix 80 parts of a bio-based polyurethane prepolymer, 40 parts of a bio-based acrylate monomer (from CN114423731B), and 8 parts of a micropowder filler. Stir and react at 67°C for 5.5 hours. Add 13 parts of modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 14 parts of luminescent powder, and 5 parts of a leveling agent. Stir and react at 50°C for 0.6 hours to obtain a high-gloss, environmentally friendly UV-curable luminescent ink.

[0071] The prepared high gloss environmentally friendly UV curable luminous ink was coated on a substrate (20 cm × 30 cm) and then cured by UV light (curing energy 2800 mJ / cm 2 ), the cured film thickness is 12μm. Performance test of the cured film:

[0072] Adhesion (ASTM D 3359-2002): 5B;

[0073] Coating appearance (visual inspection): smooth and without abnormalities;

[0074] Friction resistance (GB / T 7706-2008): 778 times;

[0075] Stain resistance / level (EN 438-2-2016): 4;

[0076] Gloss (GB / T 9754-2007): 98.0 (60°);

[0077] Hardness (GB / T 6739-2022): 5H.

[0078] Comparative Example 1

[0079] In some embodiments, a method for preparing a UV-curable luminous ink comprises the following steps:

[0080] 1. Preparation of bio-based polyurethane prepolymer

[0081] 15 parts of fructose and 2.6 parts of resorcinol were mixed and dissolved in 38 parts of water, the temperature was raised to 50°C, and the mixture was stirred until the reactant became a colorless transparent liquid. 0.25 parts of NaOH catalyst was added, the mixture was heated to 65°C, and 10.5 parts of castor oil and 6.6 parts of 1,5-pentanediisocyanate were added. The mixture was stirred until the color became a reddish-brown gel, and the stirring was continued for 3.8 hours to obtain a bio-based polyurethane prepolymer.

[0082] 2. Preparation of micropowder filler

[0083] 18 parts of esterified gelatinized starch and 4.6 parts of sodium carboxymethyl cellulose were mixed and baked at 175°C for 1.6 hours, then ground into 350 mesh, 5 parts of phosphor and 2.2 parts of paraffin were added, and the mixture was stirred at 55°C for 36 minutes to obtain a micropowder filler;

[0084] The esterified gelatinized starch is prepared from acetate starch through a traditional starch gelatinization process.

[0085] 3. Mix 80 parts of a bio-based polyurethane prepolymer, 40 parts of a bio-based acrylate monomer (from CN114423731B), and 8 parts of a micropowder filler. Stir and react at 67°C for 5.5 hours. Add 13 parts of ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 14 parts of luminescent powder, and 5 parts of a leveling agent. Stir and react at 50°C for 0.6 hours to obtain a high-gloss, environmentally friendly UV-curable luminescent ink.

[0086] The prepared high gloss environmentally friendly UV curable luminous ink was coated on a substrate (20 cm × 30 cm) and then cured by UV light (curing energy 2800 mJ / cm 2 ), the cured film thickness is 12μm. Performance test of the cured film:

[0087] Adhesion (ASTM D 3359-2002): 4B;

[0088] Coating appearance (visual inspection): The surface is relatively rough;

[0089] Friction resistance (GB / T 7706-2008): 750 times;

[0090] Stain resistance / level (EN 438-2-2016): 3;

[0091] Gloss (GB / T 9754-2007): 81.3 (60°);

[0092] Hardness (GB / T 6739-2022): 4H.

[0093] Comparative Example 2

[0094] In some embodiments, a method for preparing a UV-curable luminous ink comprises the following steps:

[0095] 1. Preparation of bio-based polyurethane prepolymer

[0096] 15 parts of fructose and 2.6 parts of resorcinol were mixed and dissolved in 38 parts of water, the temperature was raised to 50°C, and the mixture was stirred until the reactant became a colorless transparent liquid. 0.25 parts of NaOH catalyst was added, the mixture was heated to 65°C, and 10.5 parts of castor oil and 6.6 parts of 1,5-pentanediisocyanate were added. The mixture was stirred until the color became a reddish-brown gel, and the stirring was continued for 3.8 hours to obtain a bio-based polyurethane prepolymer.

[0097] 2. Preparation of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester

[0098] Blend 6.5 parts of itaconic acid-based unsaturated polyester and 31 parts of ethyl 2,4,6-trimethylbenzoylphenylphosphonate, add triethylamine dropwise, and adjust the pH to 7.3;

[0099] 3. Preparation of micropowder filler

[0100] 1 part of esterified gelatinized starch and 4.6 parts of sodium carboxymethyl cellulose were mixed and baked at 175°C for 1.6 hours, then ground into 350 mesh, 5 parts of phosphor and 2.2 parts of paraffin were added, and the mixture was stirred at 55°C for 36 minutes to obtain a micropowder filler;

[0101] The esterified gelatinized starch is prepared from acetate starch through a traditional starch gelatinization process.

[0102] Fourth, mix 80 parts of a bio-based polyurethane prepolymer, 40 parts of a bio-based acrylate monomer (from CN114423731B), and 8 parts of a micropowder filler. Stir and react at 67°C for 5.5 hours. Add 13 parts of modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 14 parts of luminescent powder, and 5 parts of a leveling agent. Stir and react at 50°C for 0.6 hours to obtain a high-gloss, environmentally friendly UV-curable luminescent ink.

[0103] The prepared high gloss environmentally friendly UV curable luminous ink was coated on a substrate (20 cm × 30 cm) and then cured by UV light (curing energy 2800 mJ / cm 2 ), the cured film thickness is 12μm. Performance test of the cured film:

[0104] Adhesion (ASTM D 3359-2002): 4B;

[0105] Coating appearance (visual inspection): smooth and without abnormalities;

[0106] Friction resistance (GB / T 7706-2008): 605 times;

[0107] Stain resistance / level (EN 438-2-2016): 4;

[0108] Gloss (GB / T 9754-2007): 96.3 (60°);

[0109] Hardness (GB / T 6739-2022): 5H.

[0110] The invention uses bio-based polyurethane prepolymer and modified 2,4,6-trimethylbenzoylphenyl phosphonic acid ethyl ester with low biological toxicity as a photoinitiator, and improves the filler at the same time, thereby reducing pollution to the environment and making the product more environmentally friendly.

[0111] The present invention modifies 2,4,6-trimethylbenzoylphenylphosphonate with an itaconic acid-based unsaturated polyester to obtain modified 2,4,6-trimethylbenzoylphenylphosphonate. A bio-based polyurethane prepolymer is obtained by reacting castor oil, resorcinol, fructose, and 1,5-pentanediisocyanate. A micropowder filler is prepared by esterifying gelatinized starch, sodium carboxymethyl cellulose, fluorescent powder, and paraffin wax. The modified 2,4,6-trimethylbenzoylphenylphosphonate effectively improves adhesion, coating appearance, stain resistance / grade, gloss, and hardness. This may be due to the self-healing function of the itaconic acid-based unsaturated polyester, which facilitates the formation of a smooth film. Furthermore, the grafting modification with 2,4,6-trimethylbenzoylphenylphosphonate increases the molecular weight and density of the three-dimensional network structure, resulting in enhanced performance. The addition of esterified gelatinized starch further enhances crosslinking strength, increasing the bonding tightness and strength of the micropowder filler, thereby enhancing performance.

[0112] The prepared high gloss environmentally friendly UV curable luminous ink was coated on the substrate and then cured by UV light (curing energy 2800mJ / cm 2 ), the thickness of the cured film can be controlled more loosely, and the thickness of the cured film can be controlled at 8-12μm. The cured film has good adhesion, coating appearance, friction resistance, stain resistance, gloss and hardness.

[0113] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A high gloss environmentally friendly UV curable luminous ink, characterized in that: The method comprises the following raw materials in parts by weight: 78 to 84 parts of bio-based polyurethane prepolymer, 38 to 45 parts of bio-based acrylate monomer, 10 to 15 parts of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester as UV curing initiator, 11 to 16 parts of luminous powder, 7 to 10 parts of micro powder filler, and 4 to 8 parts of auxiliary agent; The bio-based polyurethane prepolymer is obtained by reacting castor oil, resorcinol, fructose and 1,5-pentane diisocyanate in a weight ratio of 8-12:2-3:13-17:4-9; The preparation method of modified 2,4,6-trimethylbenzoylphenyl ethyl phosphonate comprises the following steps: blending itaconic acid-based unsaturated polyester with 2,4,6-trimethylbenzoylphenyl ethyl phosphonate, adding triethylamine dropwise, and adjusting the pH to 7.2-7.5; The micropowder filler comprises the following raw materials in parts by weight: 16 to 21 parts of gelatinized starch, 4 to 6 parts of fluorescent powder, 2 to 3 parts of paraffin wax, and 4 to 6 parts of sodium carboxymethyl cellulose.

2. The high-gloss environmentally friendly UV curable luminous ink according to claim 1, characterized in that: The preparation method of the bio-based polyurethane prepolymer is as follows: fructose and resorcinol are mixed, dissolved in 35 to 40 parts of water, heated to 40 to 60°C, stirred until the reactant becomes a colorless transparent liquid, 0.2 to 0.3 parts of NaOH catalyst are added, heated to 55 to 75°C, castor oil and 1,5-pentane diisocyanate are added, stirred until the color becomes a reddish-brown gel, and then continued to stir for 3 to 4 hours to obtain a bio-based polyurethane prepolymer.

3. The high-gloss environmentally friendly UV curable luminous ink according to claim 2, characterized in that: The mass ratio of the itaconic acid-based unsaturated polyester to ethyl 2,4,6-trimethylbenzoylphenylphosphonate is 6-8:29-41.

4. The high-gloss environmentally friendly UV curable luminous ink according to claim 1, characterized in that: The auxiliary agent is a leveling agent.

5. The high-gloss environmentally friendly UV curable luminous ink according to claim 4, characterized in that: The preparation method of the micropowder filler is as follows: esterified gelatinized starch and sodium carboxymethyl cellulose are mixed and baked at 125-200° C. for 1-2 hours, then ground to 300-400 meshes, and fluorescent powder and paraffin are added, and the mixture is stirred at 50-65° C. for 30-40 minutes to obtain the micropowder filler.

6. The high-gloss environmentally friendly UV curable luminous ink according to claim 5, characterized in that: The esterified gelatinized starch is prepared from acetate starch through a starch gelatinization process.

7. A method for preparing the high-gloss environmentally friendly UV curable luminous ink according to claim 1, characterized in that: The following steps are involved:

1. Preparation of bio-based polyurethane prepolymer Fructose and resorcinol are mixed and dissolved in 35-40 parts of water, the temperature is raised to 40-60°C, and the reaction mixture is stirred until the reaction mixture becomes a colorless transparent liquid. 0.2-0.3 parts of NaOH catalyst are added, the temperature is raised to 55-75°C, castor oil and 1,5-pentane diisocyanate are added, and the mixture is stirred until the color becomes a reddish-brown gel. The mixture is then stirred for 3-4 hours to obtain a bio-based polyurethane prepolymer.

2. Preparation of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester Itaconic acid-based unsaturated polyester and ethyl 2,4,6-trimethylbenzoylphenylphosphonate are blended, triethylamine is added dropwise, and the pH is adjusted to 7.2-7.5; 3. Preparation of micropowder filler The esterified gelatinized starch and sodium carboxymethyl cellulose are mixed and baked at 125-200°C for 1-2 hours, then ground into 300-400 mesh, and fluorescent powder and paraffin are added, and the mixture is stirred at 50-65°C for 30-40 minutes to obtain a micropowder filler.

4. Mix the bio-based polyurethane prepolymer, bio-based acrylate monomer and micropowder filler, stir and react at 65-70°C for 5-6 hours, add modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, luminous powder and additives, stir and react at 45-60°C for 0.5-1 hour to obtain high-gloss environmentally friendly UV-curable luminous ink.

8. The method for preparing the high-gloss environmentally friendly UV curable luminous ink according to claim 7, characterized in that: The weight ratio of castor oil, resorcinol, fructose and 1,5-pentamethylene diisocyanate is 8-12:2-3:13-17:4-9; the mass ratio of itaconic acid-based unsaturated polyester and 2,4,6-trimethylbenzoylphenyl ethyl phosphonate is 6-8:29-41.