A high-brightness ink varnish and preparation method thereof

Abstract

The invention relates to the technical field of ink fountain varnish, and specifically to a high-brightness ink fountain varnish and a preparation method thereof; the high-brightness ink fountain varnish comprises the following raw materials: polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, reactive diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener. The special modified polyester acrylate prepolymer is used as the main component to maintain basic film-forming performance, high gloss, wear resistance and yellowing resistance, and is combined with aliphatic polyurethane acrylate resin, reactive diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener to promote the printability of the high-brightness ink fountain varnish and promote its rapid UV curing, and the special modified polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, printing auxiliary agent and thickener work synergistically to maintain the high gloss, wear resistance and yellowing resistance of the high-brightness ink fountain varnish after film formation for a longer period of time, thereby extending the service life.

Description

Technical Field

[0001] The invention relates to the technical field of ink fountain varnish, and in particular to a high-brightness ink fountain varnish and a preparation method thereof. Background Art

[0002] Traditional ink varnish has a glass-like glossy effect. After the glue is applied, it will not damage the printed surface. It has excellent antifreeze properties and will not burst at minus 20 degrees Celsius. The varnished pattern shows a high-grade appearance, does not stick back, has good gloss, and does not delaminate. With the rapid development of sheet-fed offset printing technology and the launch of the Blue Sky Defense War, a variety of exquisite printed products have emerged. In addition to using colorful inks for printing, most exquisite printed products also need to be printed with a layer of ink varnish to protect the surface of the printed product from scratches, improve gloss, and increase the mirror reflection effect.

[0003] However, ink varnish tends to turn yellow, become less wear-resistant, and have reduced gloss after being exposed to sunlight or used for a period of time. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, one of the purposes of the present invention is to provide a high-brightness ink fountain varnish that effectively maintains high gloss, wear resistance, and yellowing resistance and extends service life.

[0005] The second object of the present invention is to provide a method for preparing high-brightness ink fountain varnish, which has simple operation, convenient control, high production efficiency, low production cost, and can be used for large-scale production.

[0006] One of the purposes of the present invention is achieved by the following technical solution: A high-brightness ink varnish comprises the following raw materials in parts by weight:

[0007]

[0008]

[0009] The high-brightness ink varnish adopts a special modified polyester acrylate prepolymer as a main component, and in addition to maintaining basic film-forming performance, high gloss, wear resistance and yellowing resistance, is combined with aliphatic polyurethane acrylate resin, active diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener to promote the printability of the high-brightness ink varnish and promote its rapid UV curing. The special modified polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, printing auxiliary agent and thickener work synergistically to maintain the high gloss, wear resistance and yellowing resistance of the high-brightness ink varnish after film formation for a longer period of time, thereby extending the service life.

[0010] Preferably, the preparation method of each polyester acrylate prepolymer comprises the following steps:

[0011] (Q1), take 50 parts of polyacid, 60-80 parts of polyol, 2-3 parts of chain extender, 0.01-0.3 parts of catalyst, 60-80 parts of acrylic monomer, 3-8 parts of alkyl acrylate phosphate and 0.03-0.05 parts of polymerization inhibitor by weight, and set aside;

[0012] (Q2), mixing the polyacid, polyol, chain extender and catalyst, heating and stirring under nitrogen protection, raising the temperature to 120-130° C. and reflux for 2-3 hours, and removing water to obtain a polyester prepolymer;

[0013] (Q3) Cooling the polyester prepolymer to 90-105° C., then adding acrylic monomer, alkyl acrylate phosphate and inhibitor and mixing evenly, heating to 135-150° C. and reflux for 1.5-3.0 hours, removing water and cooling to obtain polyester acrylate prepolymer.

[0014] By adopting the above technical scheme, polyacid, polyol and chain extender are first reacted into polyester prepolymer under the action of catalyst and high temperature conditions, and then reacted with acrylic monomer and alkyl acrylate phosphate to obtain polyester acrylate prepolymer with more functional groups such as hydroxyl and carboxyl and alkyl acrylate phosphate groups, so as to promote rapid UV curing of ink varnish and improve adhesion, wear resistance and yellowing resistance after curing; the amount of inhibitor controller added is 0.03-0.05 parts, which is beneficial to prevent gelation caused by self-polymerization of acrylic monomer and avoid affecting the overall gloss.

[0015] Preferably, the polyacid is oxalic acid and / or succinic acid; the polyol is a combination of at least two of pentaerythritol, 1,4-butanediol or 1-diethylene glycol.

[0016] Using the above technical solution, more preferably, the polyol is a mixture of pentaerythritol and 1,4-butanediol in a weight ratio of 4:1-2, with a higher hydroxyl content, which promotes the ink varnish to enhance the adhesion performance with the substrate through hydrogen bonding.

[0017] Preferably, the chain extender is dimethylolpropionic acid and / or dimethylolbutyric acid; the catalyst is p-toluenesulfonic acid; and the alkyl acrylate phosphate is selected from at least one of models KM2130, PM1520 and PM1580.

[0018] Preferably, the acrylic monomer is at least one of acrylic acid, methacrylic acid or vinyl acrylic acid; and the polymerization inhibitor is hydroquinone.

[0019] Preferably, the aliphatic polyurethane acrylate resin is selected from model Ebecryl 8210 or Ebecryl8213.

[0020] The above technical solution is used to provide good wettability, surface gloss and thermal stability for ink fountain varnish, and synergistically works with special modified polyester acrylate prepolymer to improve the yellowing resistance of varnish.

[0021] Preferably, the reactive diluent is trimethylolpropane triacrylate and / or pentaerythritol triacrylate.

[0022] By adopting the above technical scheme, the ester polymer with unsaturated double bonds adjusts the viscosity of the varnish, assists the film formation of the varnish, and enhances the rheological properties; and the active diluent participates in the curing reaction with more functional groups such as hydroxyl groups, promotes the rapid UV curing of the ink fountain varnish, and improves the adhesion, wear resistance and yellowing resistance.

[0023] Preferably, the photoinitiator is a mixture of 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinophenyl)-1-butanone and 4-methylbenzophenone in a weight ratio of 2-3:1; and the co-initiator is ethyl 4-dimethylaminobenzoate.

[0024] By adopting the above technical solution, the photoinitiator and the co-initiator work synergistically, which is beneficial to improving the UV curing efficiency of the ink fountain varnish.

[0025] Preferably, the printing auxiliary agent is kaolin and / or organic bentonite; and the thickener is fumed silica.

[0026] Using the above technical solution, more preferably, the printing auxiliary agent is a mixture of kaolin and organic bentonite in a weight ratio of 1:2-3, which can adjust the printability of the varnish without affecting the overall gloss of the ink varnish. Specifically, the organic bentonite is selected from APA, SD-1 or SD-2. The thickener is fumed silica to adjust the rheological properties of the varnish so that the varnish is paste-like as a whole, which is convenient for offset printing.

[0027] The second object of the present invention is achieved by the following technical solution: the preparation method of the above-mentioned high-brightness ink varnish comprises the following steps:

[0028] (S1), taking polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, reactive diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener according to weight parts, and setting aside;

[0029] (S2) Add polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, printing auxiliary agent and thickener to the active diluent and mix them evenly, then add photoinitiator and co-initiator and mix them evenly to obtain high-brightness ink varnish.

[0030] The beneficial effects of the present invention are as follows: the high-brightness ink fountain varnish of the present invention adopts a special modified polyester acrylate prepolymer as a main component, maintains basic film-forming performance, high gloss, wear resistance and yellowing resistance, and is combined with an aliphatic polyurethane acrylate resin, an active diluent, a photoinitiator, a co-initiator, a printing auxiliary agent and a thickener to promote the printability of the high-brightness ink fountain varnish and promote its rapid UV curing, and the special modified polyester acrylate prepolymer, the aliphatic polyurethane acrylate resin, the printing auxiliary agent and the thickener work synergistically to maintain the high gloss, wear resistance and yellowing resistance of the high-brightness ink fountain varnish after film formation for a longer period of time, thereby extending the service life.

[0031] The preparation method of the invention has the advantages of simple operation, convenient control, high production efficiency and low production cost, and can be used for large-scale production. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments, and the contents mentioned in the implementation modes are not intended to limit the present invention.

[0033] Example 1

[0034] A high-brightness ink varnish comprises the following raw materials in parts by weight:

[0035]

[0036] The preparation method of each polyester acrylate prepolymer comprises the following steps:

[0037] (Q1), take 50 parts of polyacid, 70 parts of polyol, 2.5 parts of chain extender, 0.01 parts of catalyst, 70 parts of acrylic monomer, 5 parts of alkyl acrylate phosphate and 0.04 parts of polymerization inhibitor by weight, and set aside;

[0038] (Q2), mixing the polyacid, polyol, chain extender and catalyst, heating and stirring under nitrogen protection, raising the temperature to 125° C. and reflux for 2.5 hours, and removing water to obtain a polyester prepolymer;

[0039] (Q3) Cooling the polyester prepolymer to 100°C, then adding acrylic monomer, alkyl acrylate phosphate and inhibitor and mixing evenly, heating to 145°C and reflux for 2h, removing water and cooling to obtain polyester acrylate prepolymer.

[0040] The polyacid is succinic acid; the polyol is a mixture of pentaerythritol and 1,4-butanediol in a weight ratio of 4:1.5.

[0041] The chain extender is dimethylol propionic acid; the catalyst is p-toluenesulfonic acid; and the alkyl acrylate phosphate is selected from model KM2130.

[0042] The acrylic monomer is a mixture of acrylic acid and methacrylic acid in a weight ratio of 1:1; and the polymerization inhibitor is hydroquinone.

[0043] The aliphatic polyurethane acrylate resin is selected from the model Ebecryl 8210.

[0044] The active diluent is a mixture of trimethylolpropane triacrylate and pentaerythritol triacrylate in a weight ratio of 5:1.

[0045] The photoinitiator is a mixture of 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinephenyl)-1-butanone and 4-methylbenzophenone in a weight ratio of 2.5:1; the co-initiator is ethyl 4-dimethylaminobenzoate.

[0046] The printing auxiliary agent is a mixture of kaolin and organic bentonite APA in a weight ratio of 1:2.5; the thickener is fumed silica M-5.

[0047] The method for preparing the high-brightness ink varnish comprises the following steps:

[0048] (S1), taking polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, reactive diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener according to weight parts, and setting aside;

[0049] (S2) Add polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, printing auxiliary agent and thickener to the active diluent and mix them evenly, then add photoinitiator and co-initiator and mix them evenly to obtain high-brightness ink varnish.

[0050] Example 2

[0051] A high-brightness ink varnish comprises the following raw materials in parts by weight:

[0052]

[0053] The preparation method of each polyester acrylate prepolymer comprises the following steps:

[0054] (Q1), take 50 parts of polyacid, 60 parts of polyol, 2 parts of chain extender, 0.01 parts of catalyst, 60 parts of acrylic monomer, 3 parts of alkyl acrylate phosphate and 0.03 parts of polymerization inhibitor by weight, and set aside;

[0055] (Q2), mixing the polyacid, polyol, chain extender and catalyst, heating and stirring under nitrogen protection, raising the temperature to 120° C. and reflux for 3 h, and removing water to obtain a polyester prepolymer;

[0056] (Q3) Cooling the polyester prepolymer to 90° C., then adding acrylic monomer, alkyl acrylate phosphate and inhibitor and mixing evenly, heating to 135° C. and reflux for 3.0 h, removing water and cooling to obtain polyester acrylate prepolymer.

[0057] The polyacid is succinic acid; the polyol is a mixture of pentaerythritol and 1,4-butanediol in a weight ratio of 4:1.

[0058] The chain extender is dimethylol propionic acid; the catalyst is p-toluenesulfonic acid; and the alkyl acrylate phosphate is selected from model KM2130.

[0059] The acrylic monomer is a mixture of acrylic acid and methacrylic acid in a weight ratio of 1:1; and the polymerization inhibitor is hydroquinone.

[0060] The aliphatic polyurethane acrylate resin is selected from the model Ebecryl 8210.

[0061] The active diluent is a mixture of trimethylolpropane triacrylate and pentaerythritol triacrylate in a weight ratio of 5:1.

[0062] The photoinitiator is a mixture of 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinephenyl)-1-butanone and 4-methylbenzophenone in a weight ratio of 2:1; the co-initiator is ethyl 4-dimethylaminobenzoate.

[0063] The printing auxiliary agent is a mixture of kaolin and organic bentonite SD-1 in a weight ratio of 1:2. The thickener is fumed silica M-5.

[0064] The method for preparing the high-brightness ink varnish comprises the following steps:

[0065] (S1), taking polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, reactive diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener according to weight parts, and setting aside;

[0066] (S2) Add polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, printing auxiliary agent and thickener to the active diluent and mix them evenly, then add photoinitiator and co-initiator and mix them evenly to obtain high-brightness ink varnish.

[0067] Example 3

[0068] A high-brightness ink varnish comprises the following raw materials in parts by weight:

[0069]

[0070] The preparation method of each polyester acrylate prepolymer comprises the following steps:

[0071] (Q1), take 50 parts of polyacid, 80 parts of polyol, 3 parts of chain extender, 0.3 parts of catalyst, 80 parts of acrylic monomer, 8 parts of alkyl acrylate phosphate and 0.05 parts of polymerization inhibitor by weight, and set aside;

[0072] (Q2), mixing the polyacid, polyol, chain extender and catalyst, heating and stirring under nitrogen protection, raising the temperature to 130° C. and reflux for 2 h, and removing water to obtain a polyester prepolymer;

[0073] (Q3) Cooling the polyester prepolymer to 105°C, then adding acrylic monomer, alkyl acrylate phosphate and inhibitor and mixing evenly, heating to 150°C and reflux for 1.5h, removing water and cooling to obtain polyester acrylate prepolymer.

[0074] The polyacid is succinic acid; the polyol is a mixture of pentaerythritol and 1,4-butanediol in a weight ratio of 4:2.

[0075] The chain extender is dimethylol propionic acid; the catalyst is p-toluenesulfonic acid; and the alkyl acrylate phosphate is selected from model KM2130.

[0076] The acrylic monomer is a mixture of acrylic acid and methacrylic acid in a weight ratio of 1:1; and the polymerization inhibitor is hydroquinone.

[0077] The aliphatic polyurethane acrylate resin is selected from the model Ebecryl 8210.

[0078] The active diluent is a mixture of trimethylolpropane triacrylate and pentaerythritol triacrylate in a weight ratio of 5:1.

[0079] The photoinitiator is a mixture of 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinephenyl)-1-butanone and 4-methylbenzophenone in a weight ratio of 3:1; the co-initiator is ethyl 4-dimethylaminobenzoate.

[0080] The printing auxiliary agent is a mixture of kaolin and organic bentonite SD-1 in a weight ratio of 1:3. The thickener is fumed silica M-5.

[0081] The method for preparing the high-brightness ink varnish comprises the following steps:

[0082] (S1), taking polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, reactive diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener according to weight parts, and setting aside;

[0083] (S2) Add polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, printing auxiliary agent and thickener to the active diluent and mix them evenly, then add photoinitiator and co-initiator and mix them evenly to obtain high-brightness ink varnish.

[0084] Example 4

[0085] A high-brightness ink varnish comprises the following raw materials in parts by weight:

[0086]

[0087] The preparation method of each polyester acrylate prepolymer comprises the following steps:

[0088] (Q1), take 50 parts of polyacid, 75 parts of polyol, 2.2 parts of chain extender, 0.05 parts of catalyst, 75 parts of acrylic monomer, 6 parts of alkyl acrylate phosphate and 0.04 parts of polymerization inhibitor by weight, and set aside;

[0089] (Q2), the polyacid, polyol, chain extender and catalyst are mixed, heated and stirred under nitrogen protection, the temperature is raised to 128° C. and refluxed for 2.6 hours, and a polyester prepolymer is obtained after removing water;

[0090] (Q3) Cooling the polyester prepolymer to 95° C., then adding acrylic monomer, alkyl acrylate phosphate and inhibitor and mixing evenly, heating to 145° C. and reflux for 2.5 hours, removing water and cooling to obtain polyester acrylate prepolymer.

[0091] The polyacid is succinic acid; the polyol is a mixture of pentaerythritol and 1,4-butanediol in a weight ratio of 4:1.6.

[0092] The chain extender is dimethylol propionic acid; the catalyst is p-toluenesulfonic acid; and the alkyl acrylate phosphate is selected from model KM2130.

[0093] The acrylic monomer is a mixture of acrylic acid and methacrylic acid in a weight ratio of 1:1; and the polymerization inhibitor is hydroquinone.

[0094] The aliphatic polyurethane acrylate resin is selected from the model Ebecryl 8210.

[0095] The active diluent is a mixture of trimethylolpropane triacrylate and pentaerythritol triacrylate in a weight ratio of 5:1.

[0096] The photoinitiator is a mixture of 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinephenyl)-1-butanone and 4-methylbenzophenone in a weight ratio of 2.6:1; the co-initiator is ethyl 4-dimethylaminobenzoate.

[0097] The printing auxiliary agent is a mixture of kaolin and organic bentonite APA in a weight ratio of 1:2.5. The thickener is fumed silica M-5.

[0098] The method for preparing the high-brightness ink varnish comprises the following steps:

[0099] (S1), taking polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, reactive diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener according to weight parts, and setting aside;

[0100] (S2) Add polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, printing auxiliary agent and thickener to the active diluent and mix them evenly, then add photoinitiator and co-initiator and mix them evenly to obtain high-brightness ink varnish.

[0101] Comparative Example 1

[0102] The difference between this comparative example and Example 1 is:

[0103] The polyester acrylate prepolymer is replaced by polyester acrylate UV curing resin EBECRYL 547.

[0104] Comparative Example 2

[0105] The difference between this comparative example and Example 1 is:

[0106] In the polyester acrylate prepolymer, the weight portion of alkyl acrylate phosphate is 0 parts, that is, the polyester acrylate prepolymer does not contain alkyl acrylate phosphate.

[0107] Comparative Example 3

[0108] The difference between this comparative example and Example 1 is:

[0109] The printing auxiliary agent is a mixture of kaolin and talcum powder in a weight ratio of 1:2.5.

[0110] Comparative Example 4

[0111] The difference between this comparative example and Example 1 is:

[0112] The active diluent is trimethylolpropane triacrylate.

[0113] Performance Testing

[0114] The ink varnish samples of Examples 1-4 and Comparative Examples 1-4 were taken and tested for abrasion resistance, glossiness, and yellowing resistance, respectively. The test methods are as follows:

[0115] Wear resistance test: According to the international standard ISO 7784.2-97, the wear resistance of the coating is measured by the rotating friction rubber wheel method, that is, the turntable rotates at a speed of 60r / min, and under the action of 175g force, the coating surface is worn with a hard rubber friction wheel embedded with diamond abrasive. The average number of grinding revolutions required to wear a coating with a thickness of 20μm is expressed.

[0116] Gloss test: Test standard GB / T 13448-2006, instrument model: HG60S gloss meter, incident angle: 60°, read the gloss value.

[0117] Yellowing resistance test: Based on GB / T 13448-2006 UV lamp accelerated aging test, use UVA-340 fluorescent UV lamp to irradiate for 30 days, 12 hours as a cycle: 8 hours of UV light, blackboard temperature (70℃±3℃), 4 hours of condensation, blackboard temperature (50℃±3℃); then test and evaluate the color change level and gloss loss level of the sample in accordance with "GB / T1766-1995 Rating method for aging of paint and varnish coatings".

[0118] The test results are shown in Table 1 below:

[0119]

[0120] As can be seen from Table 1 above, the high-brightness ink fountain varnish of the present invention adopts a special modified polyester acrylate prepolymer as a main component, and in addition to maintaining basic film-forming performance, high gloss, wear resistance and yellowing resistance, it is combined with aliphatic polyurethane acrylate resin, reactive diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener to promote the printability of the high-brightness ink fountain varnish, and the special modified polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, printing auxiliary agent and thickener work synergistically to maintain the high gloss, wear resistance and yellowing resistance of the high-brightness ink fountain varnish after film formation for a longer period of time, thereby extending the service life.

[0121] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A high brightness ink varnish, characterized in that: The invention comprises the following raw materials in parts by weight: The preparation method of each polyester acrylate prepolymer comprises the following steps: (Q1), take 50 parts of polyacid, 60-80 parts of polyol, 2-3 parts of chain extender, 0.01-0.3 parts of catalyst, 60-80 parts of acrylic monomer, 3-8 parts of alkyl acrylate phosphate and 0.03-0.05 parts of polymerization inhibitor by weight, and set aside; (Q2), mixing the polyacid, polyol, chain extender and catalyst, heating and stirring under nitrogen protection, raising the temperature to 120-130° C. and reflux for 2-3 hours, and removing water to obtain a polyester prepolymer; (Q3) Cooling the polyester prepolymer to 90-105° C., then adding acrylic monomer, alkyl acrylate phosphate and inhibitor and mixing evenly, heating to 135-150° C. and reflux for 1.5-3.0 hours, removing water and cooling to obtain polyester acrylate prepolymer.

2. The high-brightness ink varnish according to claim 1, characterized in that: The polyacid is oxalic acid and / or succinic acid; the polyol is a combination of at least two of pentaerythritol, 1,4-butanediol or 1-diethylene glycol.

3. The high brightness ink varnish according to claim 1, characterized in that: The chain extender is dimethylol propionic acid and / or dimethylol butyric acid; the catalyst is p-toluenesulfonic acid; and the alkyl acrylate phosphate is selected from at least one of models KM2130, PM1520 and PM1580.

4. The high-brightness ink varnish according to claim 1, characterized in that: The acrylic monomer is at least one of acrylic acid, methacrylic acid or vinyl acrylic acid; and the polymerization inhibitor is hydroquinone.

5. The high brightness ink varnish according to claim 1, characterized in that: The aliphatic polyurethane acrylate resin is selected from Ebecryl 8210 or Ebecryl 8213.

6. The high-brightness ink varnish according to claim 1, characterized in that: The active diluent is trimethylolpropane triacrylate and / or pentaerythritol triacrylate.

7. The high-brightness ink varnish according to claim 1, characterized in that: The photoinitiator is a mixture of 2-(4-methylbenzyl)-2-(dimethylamino)-1-(4-morpholinephenyl)-1-butanone and 4-methylbenzophenone in a weight ratio of 2-3:1; and the co-initiator is ethyl 4-dimethylaminobenzoate.

8. The high-brightness ink varnish according to claim 1, characterized in that: The printing auxiliary agent is kaolin and / or organic bentonite; the thickener is fumed silica.

9. A method for preparing high-brightness ink varnish according to any one of claims 1 to 8, characterized in that: The steps include: (S1), taking polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, reactive diluent, photoinitiator, co-initiator, printing auxiliary agent and thickener according to weight parts, and setting aside; (S2) Add polyester acrylate prepolymer, aliphatic polyurethane acrylate resin, printing auxiliary agent and thickener to the active diluent and mix them evenly, then add photoinitiator and co-initiator and mix them evenly to obtain high-brightness ink varnish.

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