High-gloss environment-friendly UV (ultraviolet) curing noctilucent ink and preparation method thereof

Abstract

The invention discloses high-gloss environment-friendly UV (ultraviolet) curing noctilucent ink and a preparation method thereof, and belongs to the technical field of UV curing noctilucent ink, the high-gloss environment-friendly UV curing noctilucent ink is prepared from the following raw materials in parts by weight: 78-84 parts of bio-based polyurethane prepolymer, 38-45 parts of bio-based acrylate monomer, 10-15 parts of modified 2, 4, 6-trimethylbenzoyl phenyl ethyl phosphonate as a UV curing initiator and 11-16 parts of noctilucent powder, 7-10 parts of a micro-powder filler and 4-8 parts of an auxiliary agent; the bio-based polyurethane prepolymer is obtained by reaction of castor oil, resorcinol, fructose and 1, 5-pentamethylene diisocyanate according to the weight ratio of (8-12): (2-3): (13-17): (4-9). Through the mode, a substrate is coated with the prepared high-gloss environment-friendly UV curing noctilucent ink, then UV light curing treatment (curing energy is 2800mJ / cm < 2 >) is carried out, the thickness of a curing film is controlled to be loose and can be controlled to be 8-12 microns, and the curing film has good coating appearance, friction resistance, stain resistance and glossiness.

Description

Technical Field

[0001] The invention relates to the technical field of UV curing luminous ink, and in particular to a high-gloss environmentally friendly UV curing 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, comprising the following raw materials in parts by weight: 78-84 parts of bio-based polyurethane prepolymer, 38-45 parts of bio-based acrylate monomer, 10-15 parts of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester as UV curing initiator, 11-16 parts of luminous powder, 7-10 parts of micro powder filler, and 4-8 parts of additives;

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

[0009] The preparation method of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester comprises the following steps: blending itaconic acid-based unsaturated polyester with 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, dropping 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-pentanediisocyanate 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 at 125-200°C for 1-2h, then grind to 300-400 mesh, add fluorescent powder and paraffin, stir and mix at 50-65°C for 30-40min, and 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] Mix fructose and resorcinol, dissolve in 35-40 parts of water, heat to 40-60°C, stir until the reactant becomes a colorless transparent liquid, add 0.2-0.3 parts of NaOH catalyst, heat to 55-75°C, add castor oil and 1,5-pentanediisocyanate, stir until the color changes to a reddish brown colloid, and continue stirring 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 micro powder 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 meshes, and fluorescent powder and paraffin are added, and stirred and mixed at 50-65°C for 30-40 minutes to obtain a micro powder filler;

[0023] 4. Mix the bio-based polyurethane prepolymer, bio-based acrylate monomer and micro-powder filler, stir and react at 65-70°C for 5-6 hours, add modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 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-based unsaturated polyester and 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester 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 biological toxicity as a photoinitiator, and at the same time improves the filler, thereby reducing pollution to the environment and making the product more environmentally friendly.

[0027] 2. The present invention modifies 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester by itaconic acid unsaturated polyester to obtain modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, obtains bio-based polyurethane prepolymer by reacting castor oil, resorcinol, fructose and 1,5-pentanediisocyanate, prepares micropowder filler by esterification gelatinized starch, sodium carboxymethyl cellulose, fluorescent powder and paraffin, and the modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester can effectively increase adhesion, coating appearance, stain resistance / grade, glossiness and hardness. The reason may be that itaconic acid unsaturated polyester has a self-repairing function, which is conducive to the formation of a flat film package in appearance, and after it is grafted and modified with 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, the molecular weight is increased, the density of the three-dimensional network structure is increased, and the performance is enhanced. The increase of esterified gelatinized starch can further improve the cross-linking strength, increase the bonding tightness and strength of the micropowder filler, and thus play a performance enhancement effect.

[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] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described in combination with the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0030] Embodiment 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, dissolved in 35 parts of water, heated to 60°C, stirred until the reactant became a colorless transparent liquid, 0.2 parts of NaOH catalyst was added, heated to 75°C, 8 parts of castor oil and 9 parts of 1,5-pentanediisocyanate were added, stirred until the color changed to a reddish brown colloid, and then continued to stir 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 and 41 parts of ethyl 2,4,6-trimethylbenzoylphenylphosphonate, dropwise add triethylamine, and adjust the pH to 7.2;

[0035] 3. Preparation of micro powder filler

[0036] 16 parts of esterified gelatinized starch and 6 parts of sodium carboxymethyl cellulose were mixed and baked at 125°C for 2 hours, then ground into 300 meshes, 6 parts of fluorescent powder and 2 parts of paraffin were added, and the mixture was stirred and mixed at 65°C for 30 minutes to obtain a micro powder filler;

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

[0038] 4. Mix 78 parts of bio-based polyurethane prepolymer, 45 parts of bio-based acrylate monomer and 7 parts of micro powder filler. The bio-based acrylate monomer adopts the bio-based acrylate monomer of CN114423731B. Stir and react at 70°C for 5 hours, add 15 parts of modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 11 parts of luminous powder and 8 parts of auxiliary agent, the auxiliary agent is a leveling agent. Stir and react at 45°C for 1 hour to obtain high gloss environmentally friendly UV curing luminous ink.

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

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

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

[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] Embodiment 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, dissolved in 40 parts of water, heated to 40°C, stirred until the reactant became a colorless transparent liquid, 0.3 parts of NaOH catalyst was added, heated to 55°C, 12 parts of castor oil and 4 parts of 1,5-pentanediisocyanate were added, stirred until the color changed to a reddish brown colloid, and then continued to stir 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 micro powder filler

[0052] 21 parts of esterified gelatinized starch and 4 parts of sodium carboxymethyl cellulose were mixed and baked at 200°C for 1 hour, then ground into 400 meshes, 4 parts of fluorescent powder and 3 parts of paraffin were added, and stirred and mixed at 50°C for 40 minutes to obtain a micro powder filler;

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

[0054] 4. Mix 84 parts of bio-based polyurethane prepolymer, 38 parts of bio-based acrylate monomer and 10 parts of micro powder filler. The bio-based acrylate monomer adopts the bio-based acrylate monomer of CN114423731B. Stir and react for 6 hours at 65°C, add 10 parts of modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 16 parts of luminous powder and 4 parts of auxiliary agent, the auxiliary agent is a leveling agent. Stir and react for 0.5 hours at 60°C to obtain high gloss environmentally friendly UV curing luminous ink.

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

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

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

[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] Embodiment 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, dissolved in 38 parts of water, heated to 50°C, stirred until the reactant became a colorless transparent liquid, 0.25 parts of NaOH catalyst was added, heated to 65°C, 10.5 parts of castor oil and 6.6 parts of 1,5-pentanediisocyanate were added, stirred until the color changed to a reddish brown colloid, and then continued to stir for 3.8 hours to obtain a bio-based polyurethane prepolymer;

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

[0066] 6.5 parts of itaconic acid-based unsaturated polyester and 31 parts of ethyl 2,4,6-trimethylbenzoylphenylphosphonate were blended, triethylamine was added dropwise, and the pH was adjusted to 7.3;

[0067] 3. Preparation of micro powder 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 to 350 mesh, 5 parts of fluorescent powder and 2.2 parts of paraffin were added, and the mixture was stirred at 55°C for 36 minutes to obtain a micro powder filler;

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

[0070] 4. Mix 80 parts of bio-based polyurethane prepolymer, 40 parts of bio-based acrylate monomer and 8 parts of micro powder filler. The bio-based acrylate monomer adopts the bio-based acrylate monomer of CN114423731B. Stir and react at 67°C for 5.5 hours, add 13 parts of modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 14 parts of luminous powder and 5 parts of auxiliary agent, the auxiliary agent is a leveling agent. Stir and react at 50°C for 0.6 hours to obtain high gloss environmentally friendly UV curing luminous ink.

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

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

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

[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, dissolved in 38 parts of water, heated to 50°C, stirred until the reactant became a colorless transparent liquid, 0.25 parts of NaOH catalyst was added, heated to 65°C, 10.5 parts of castor oil and 6.6 parts of 1,5-pentanediisocyanate were added, stirred until the color changed to a reddish brown colloid, and then continued to stir for 3.8 hours to obtain a bio-based polyurethane prepolymer;

[0082] 2. Preparation of micro powder 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 to 350 mesh, 5 parts of fluorescent powder and 2.2 parts of paraffin were added, and the mixture was stirred at 55°C for 36 minutes to obtain a micro powder filler;

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

[0085] 3. Mix 80 parts of bio-based polyurethane prepolymer, 40 parts of bio-based acrylate monomer and 8 parts of micro powder filler. The bio-based acrylate monomer adopts the bio-based acrylate monomer of CN114423731B. Stir and react at 67°C for 5.5 hours, add 13 parts of ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 14 parts of luminous powder and 5 parts of auxiliary agent, the auxiliary agent is a leveling agent. Stir and react at 50°C for 0.6 hours to obtain high gloss environmentally friendly UV curing luminous ink.

[0086] The prepared high gloss environmentally friendly UV curable luminous ink was coated on the substrate (20cm×30cm) and then cured by UV light (curing energy 2800mJ / cm 2 ), the thickness of the cured film 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, dissolved in 38 parts of water, heated to 50°C, stirred until the reactant became a colorless transparent liquid, 0.25 parts of NaOH catalyst was added, heated to 65°C, 10.5 parts of castor oil and 6.6 parts of 1,5-pentanediisocyanate were added, stirred until the color changed to a reddish brown colloid, and then continued to stir for 3.8 hours to obtain a bio-based polyurethane prepolymer;

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

[0098] 6.5 parts of itaconic acid-based unsaturated polyester and 31 parts of ethyl 2,4,6-trimethylbenzoylphenylphosphonate were blended, triethylamine was added dropwise, and the pH was adjusted to 7.3;

[0099] 3. Preparation of micro powder filler

[0100] Mix 1 part of esterified gelatinized starch and 4.6 parts of sodium carboxymethyl cellulose, bake at 175°C for 1.6 hours, grind to 350 mesh, add 5 parts of fluorescent powder and 2.2 parts of paraffin, stir and mix at 55°C for 36 minutes, and obtain a micro powder filler;

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

[0102] 4. Mix 80 parts of bio-based polyurethane prepolymer, 40 parts of bio-based acrylate monomer and 8 parts of micro powder filler. The bio-based acrylate monomer adopts the bio-based acrylate monomer of CN114423731B. Stir and react at 67°C for 5.5 hours, add 13 parts of modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 14 parts of luminous powder and 5 parts of auxiliary agent, the auxiliary agent is a leveling agent. Stir and react at 50°C for 0.6 hours to obtain high gloss environmentally friendly UV curing luminous ink.

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

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

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

[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-trimethylbenzoylphenylphosphonic 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-trimethylbenzoylphenylphosphonic acid ethyl ester by itaconic acid unsaturated polyester to obtain modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, obtains bio-based polyurethane prepolymer by reacting castor oil, resorcinol, fructose and 1,5-pentanediisocyanate, prepares micropowder filler by esterification gelatinized starch, sodium carboxymethyl cellulose, fluorescent powder and paraffin, and the modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester can effectively increase adhesion, coating appearance, stain resistance / grade, glossiness and hardness. The reason may be that itaconic acid unsaturated polyester has a self-repairing function, which is conducive to the formation of a flat film package in appearance, and after grafting and modification with 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, the molecular weight is increased, the density of the three-dimensional network structure is increased, and the performance is enhanced. The increase of esterified gelatinized starch can further improve the cross-linking strength, increase the bonding tightness and strength of the micropowder filler, and thus play a performance enhancement effect.

[0112] The prepared high gloss environmentally friendly UV curable luminous ink is 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 the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such 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 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-pentanediisocyanate in a weight ratio of 8-12:2-3:13-17:4-9; The preparation method of modified 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester comprises the following steps: blending itaconic acid-based unsaturated polyester with 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester, dropping triethylamine, and adjusting the pH to 7.2-7.

5.

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-pentanediisocyanate 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.

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 3, characterized in that: The micro powder 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.

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

6. The high gloss environmentally friendly UV curable luminous ink according to claim 5, characterized in that: The preparation method of the micro powder 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, added with fluorescent powder and paraffin, and stirred and mixed at 50-65° C. for 30-40 minutes to obtain the micro powder filler.

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

8. A method for preparing the high gloss environmentally friendly UV curable luminous ink according to claim 5, characterized in that: The following steps are involved:

1. Preparation of bio-based polyurethane prepolymer Mix fructose and resorcinol, dissolve in 35-40 parts of water, heat to 40-60°C, stir until the reactant becomes a colorless transparent liquid, add 0.2-0.3 parts of NaOH catalyst, heat to 55-75°C, add castor oil and 1,5-pentanediisocyanate, stir until the color changes to a reddish brown colloid, and continue stirring 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 micro powder 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 meshes, and fluorescent powder and paraffin are added, and stirred and mixed at 50-65°C for 30-40 minutes to obtain a micro powder filler; 4. Mix the bio-based polyurethane prepolymer, bio-based acrylate monomer and micro-powder filler, stir and react at 65-70°C for 5-6 hours, add modified ethyl 2,4,6-trimethylbenzoylphenylphosphonate, 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.

9. The method for preparing the high-gloss environmentally friendly UV-curable luminous ink according to claim 8, characterized in that: 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-based unsaturated polyester and 2,4,6-trimethylbenzoylphenylphosphonic acid ethyl ester is 6-8:29-41.

10. The method for preparing the high-gloss environmentally friendly UV-curable luminous ink according to claim 9, characterized in that: The micro powder 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.