A matte uv reverse face oil and a preparation method and application thereof

Abstract

The application discloses a matte UV reverse surface oil and a preparation method and application thereof. The matte UV reverse surface oil comprises the following components in parts by weight: 40-50 parts of a polymerizable oligomer, 20-30 parts of an active diluent, 5-15 parts of an active amine, 5-15 parts of a photo-initiating agent and 1-10 parts of an additive. The polymerizable oligomer in the matte UV reverse surface oil is a combination of an aliphatic polyamine ester acrylate and an amine modified polyether acrylate. The matte UV reverse surface oil prepared by the polymerizable oligomer, the active diluent and other components has a good matte effect. The area printed by the matte UV reverse surface oil and a UV reverse base oil has a strong matte and sanding touch. The matte UV reverse surface oil is free of any benzene solvent, has low odor and small harm to human bodies. The preparation method of the matte UV reverse surface oil is simple in operation, good in repeatability, can be mass standardized production and has a good market prospect.

Description

Technical Field

[0001] This invention belongs to the field of UV offset printing ink technology, specifically relating to a matte UV reverse surface oil, its preparation method, and its application. Background Technology

[0002] With the rapid development of offset printing in the packaging technology field, various types of paper packaging boxes have emerged. For example, paper packaging boxes are used for cigarettes, alcohol, tea, cosmetics, and gifts. Among these, paper packaging boxes with both matte reverse frosted and matte flat finishes are favored by the market. Clearly, UV reverse frosting technology has become an inevitable trend in the packaging printing industry. The principle of UV reverse frosting technology is to first print conventional colored inks on the substrate surface, then partially print a UV reverse base coat, and finally coat the entire printed surface with a UV reverse top coat. Upon contact, the UV reverse base coat and UV reverse top coat undergo an instantaneous cohesive reaction on the printed surface, forming a small-particle, sand-like ink film. Areas without the UV reverse base coat exhibit a high-gloss flat effect, resulting in a clear distinction between gloss and matte finishes on the entire printed surface.

[0003] Currently, UV reverse matte printing technology still has some shortcomings. Because commercially available UV reverse base coats are all high-gloss reverse top coats, if a UV-coated matte oil is used as the UV reverse top coat for printing, the UV reverse base coat cannot undergo a cohesive reaction with it, failing to form small particles. This is because the UV-coated matte oil contains a large amount of matting powder, significantly altering the thixotropic properties of the reverse base coat, preventing the reverse top coat from cohesing with it, and thus the printed material cannot achieve a matte effect. Therefore, there is an urgent need for a matte UV reverse top coat that can be printed together with commercially available conventional UV reverse base coats to form a small-particle, sandy ink film through a cohesive reaction, while also maintaining a matte, flat surface effect in areas where no UV reverse base coat has been printed. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the first objective of this invention is to provide a matte UV reverse coating oil, wherein the polymerizable oligomer in the matte UV reverse coating oil is a composition of aliphatic polyurethane acrylate and amine-modified polyether acrylate, and the reactive diluent is a composition of caprolactone-grafted hydroxy acrylate and tridecyl acrylate. The matte UV reverse coating oil prepared by the polymerizable oligomer, reactive diluent and other components has a good matte effect, and the area where the matte UV reverse coating oil and UV reverse base oil are printed together has a strong matte frosted feel. At the same time, the matte UV reverse coating oil of this invention contains no benzene solvents, has a low odor, and is less harmful to the human body.

[0005] The second objective of this invention is to provide a method for preparing matte UV reverse surface oil, which is simple to operate, has good repeatability, and can be mass-produced in a standardized manner.

[0006] The third objective of this invention is to provide an application of a matte UV reverse surface oil.

[0007] One of the objectives of this invention is achieved by adopting the following technical solution:

[0008] A matte UV reverse coating oil comprises the following components in parts by weight: 40-50 parts of polymeric oligomer, 20-30 parts of reactive diluent, 5-15 parts of reactive amine, 5-15 parts of photoinitiator, and 1-10 parts of additive; wherein the polymeric oligomer comprises aliphatic polyurethane acrylate and amine-modified polyether acrylate.

[0009] Furthermore, the mass ratio of aliphatic polyurethane acrylate to amine-modified polyether acrylate in the polymeric oligomer is 3:1 to 2.

[0010] Furthermore, the reactive diluent comprises caprolactone-grafted hydroxy acrylate and tridecyl acrylate.

[0011] Furthermore, the mass ratio of caprolactone-grafted hydroxy acrylate and tridecyl acrylate in the reactive diluent is 1:0.5 to 1.5.

[0012] Furthermore, the aliphatic polyurethane acrylate has a functionality of 2, an active ingredient content of 100%, a viscosity of 800–1200 cps at 25°C, a molecular weight of 800–1100, and a refractive index of 1.4–1.5.

[0013] The amine-modified polyether acrylate has a functionality of 4, an effective component of 99%, a viscosity of 2800–3200 cps at 25°C, a molecular weight of 800–1200, and a refractive index of 1.45–1.55.

[0014] Furthermore, the caprolactone-grafted hydroxy acrylate has a functionality of 1, a viscosity of 60-100 cps at 25°C, a molecular weight of 320-360, a refractive index of 1.45-1.55, and an acid value of ≤6 mgKOH / g.

[0015] The tridecyl acrylate has a functionality of 1, a viscosity of 1-50 cps at 25°C, a molecular weight of 240-290, and a refractive index of 1.45-1.55.

[0016] Furthermore, the active amine is one or a combination of two or more of ethylenediamine, propylenediamine, and isopropylenediamine;

[0017] The photoinitiator is one or a combination of two or more of the following: ethyl 4-dimethylaminobenzoate, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0018] The additive is one or a combination of two or more of the following: defoamer, leveling agent, and polymerization inhibitor.

[0019] The second objective of this invention is achieved by adopting the following technical solution:

[0020] A method for preparing any of the above-described matte UV reverse surface oils includes the following steps:

[0021] The polymeric oligomer is mixed with an active diluent and stirred until homogeneous to obtain a polymeric prepolymer. Then, a photoinitiator and an active amine are added and stirred to obtain a mixture. Additives are then added and stirred to obtain the matte UV reverse surface oil.

[0022] Furthermore, the polymeric oligomer and the reactive diluent are stirred at 1200-1400 r / min until the fineness of the polymeric prepolymer reaches below 5 μm;

[0023] The polymeric prepolymer, photoinitiator, and active amine are stirred at 1000–1200 r / min until the fineness of the mixture reaches below 5 μm;

[0024] The mixture and additives are dispersed evenly at 500-700 r / min to obtain the matte UV reverse surface oil.

[0025] The third objective of this invention is achieved by adopting the following technical solution:

[0026] An application of any of the above-described matte UV reverse coatings involves printing the matte UV reverse coating onto a printed material coated with a conventional UV reverse base coat to obtain a printed material that has both matte frosted areas and matte flat areas. Compared to the prior art, the advantages of this invention are:

[0027] 1. This invention provides a matte UV reverse coating oil. This matte UV reverse coating oil can be printed on printed materials as needed using a UV offset ink printing machine. After contact with the UV reverse base oil on the surface of the printed material, an intramolecular reaction occurs instantly, forming a small-particle, sandy ink film. Areas without the UV reverse base oil exhibit a high-gloss flat effect. The entire printed surface displays a clear distinction between gloss and matte, resulting in printed materials with both matte and matte areas. The polymerizable oligomer in the matte UV reverse coating oil is a combination of aliphatic polyurethane acrylate and amine-modified polyether acrylate, and the reactive diluent is a combination of caprolactone-grafted hydroxyl acrylate and tridecyl acrylate. The matte UV reverse coating oil prepared by the polymerizable oligomer, reactive diluent, and other components has a good matte effect. The area where the matte UV reverse coating oil and the UV reverse base oil are printed in series has a strong matte, sandy feel. Furthermore, the matte UV reverse coating oil of this invention contains no benzene solvents, has a low odor, and is minimally harmful to the human body.

[0028] 2. The preparation method of the matte UV reverse surface oil of the present invention is simple to operate, has good repeatability, can be mass-produced in a standardized manner, and has good market prospects. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Unless otherwise specified, the experimental methods used in the following experimental examples are conventional methods; the materials and reagents used are commercially available unless otherwise specified.

[0031] A matte UV reverse coating oil comprises the following components in parts by weight: 40-50 parts of polymeric oligomer, 20-30 parts of reactive diluent, 5-15 parts of reactive amine, 5-15 parts of photoinitiator, and 1-10 parts of additive; wherein the polymeric oligomer comprises aliphatic polyurethane acrylate and amine-modified polyether acrylate.

[0032] The matte UV reverse coating of this invention contains a polymerizable oligomer composed of aliphatic polyurethane acrylate and amine-modified polyether acrylate, and an reactive diluent composed of caprolactone-grafted hydroxy acrylate and tridecyl acrylate. The matte UV reverse coating prepared by the polymerizable oligomer, reactive diluent, and other components has a good matte effect. The area where the matte UV reverse coating is printed in conjunction with the UV reverse base coat has a strong matte frosted feel. The matte UV reverse coating of this invention contains no benzene solvents, has a low odor, and is less harmful to the human body.

[0033] In one embodiment, the mass ratio of aliphatic polyurethane acrylate to amine-modified polyether acrylate in the polymeric oligomer is 3:1 to 2.

[0034] In one embodiment, the reactive diluent comprises caprolactone-grafted hydroxy acrylate and tridecyl acrylate.

[0035] In one embodiment, the mass ratio of caprolactone-grafted hydroxy acrylate and tridecyl acrylate in the reactive diluent is 1:0.5 to 1.5.

[0036] The mass ratio of aliphatic polyurethane acrylate to amine-modified polyether acrylate is 3:1 to 2, and the mass ratio of caprolactone-grafted hydroxy acrylate to tridecyl acrylate is 1:0.5 to 1.5. Under these ratios, the polymerizable oligomers and reactive diluents obtained by compounding can be used to prepare matte UV reverse surface oil, which can significantly improve the matte effect of matte UV reverse surface oil.

[0037] As one embodiment, the aliphatic polyurethane acrylate has a functionality of 2, an active ingredient of 100%, a viscosity of 800-1200 cps at 25°C, a molecular weight of 800-1100, and a refractive index of 1.4-1.5.

[0038] The amine-modified polyether acrylate has a functionality of 4, an effective component of 99%, a viscosity of 2800–3200 cps at 25°C, a molecular weight of 800–1200, and a refractive index of 1.45–1.55.

[0039] Preferably, the aliphatic polyurethane acrylate has a molecular weight of 900-1000 and a refractive index of 1.44-1.48;

[0040] The amine-modified polyether acrylate has a refractive index of 1.48–1.49 and a viscosity of 2900–3100 cps at 25°C.

[0041] As one embodiment, the caprolactone-grafted hydroxy acrylate has a functionality of 1, a viscosity of 60-100 cps at 25°C, a molecular weight of 320-360, a refractive index of 1.45-1.55, and an acid value of ≤6 mgKOH / g.

[0042] The tridecyl acrylate has a functionality of 1, a viscosity of 1-50 cps at 25°C, a molecular weight of 240-290, and a refractive index of 1.45-1.55.

[0043] Preferably, the caprolactone-grafted hydroxy acrylate has a viscosity of 70-90 cps at 25°C, a molecular weight of 330-350, a hydroxyl value of 160-170 mg / g KOH, and an acid value of ≤5 mg / g KOH.

[0044] The tridecyl acrylate has a viscosity of 5-11 cps at 25°C, a molecular weight of 250-270, a refractive index of 1.47-1.48, and a Tg value of -55°C.

[0045] Among them, the functionality of tridecyl acrylate is 1. When the functionality of tridecyl acrylate is greater than 1, the polymerizable oligomer cannot be sufficiently wetted, resulting in a poor matte effect after coating and varnishing.

[0046] As one embodiment, the active amine is one or a combination of two or more of ethylenediamine, propylenediamine, and isopropylenediamine;

[0047] The photoinitiator is one or a combination of two or more of the following: ethyl 4-dimethylaminobenzoate, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0048] The additive is one or a combination of two or more of the following: defoamer, leveling agent, and polymerization inhibitor.

[0049] The present invention also provides a method for preparing any of the above-described matte UV reverse surface oils, comprising the following steps:

[0050] The polymeric oligomer is mixed with an active diluent and stirred until homogeneous to obtain a polymeric prepolymer. Then, a photoinitiator and an active amine are added and stirred to obtain a mixture. Additives are then added and stirred to obtain the matte UV reverse surface oil.

[0051] As one embodiment, the polymeric oligomer and the reactive diluent are stirred at 1200-1400 r / min until the fineness of the polymeric prepolymer reaches below 5 μm;

[0052] The polymeric prepolymer, photoinitiator, and active amine are stirred at 1000–1200 r / min until the fineness of the mixture reaches below 5 μm;

[0053] The mixture and additives are dispersed evenly at 500-700 r / min to obtain the matte UV reverse surface oil.

[0054] The preparation method of the matte UV reverse surface oil of the present invention is simple to operate, has good repeatability, can be mass-produced in a standardized manner, and has good market prospects.

[0055] The present invention also provides an application of any of the above-described matte UV reverse coatings, wherein the matte UV reverse coating is printed on a printed material coated with a conventional UV reverse base coat to obtain a printed material that has both matte frosted areas and matte flat areas.

[0056] The following specific embodiments illustrate the matte UV reverse surface oil of the present invention and its preparation method.

[0057] The materials used in the embodiments and comparative examples are as follows:

[0058] Aliphatic polyurethane acrylate: 2022, Zhaoqing Baojun Chemical Co., Ltd.;

[0059] Amine-modified polyether acrylate: EBECRYL 81, Zhanxin Resin (China) Co., Ltd.;

[0060] Tridecyl acrylate: TDMA, Tesco Chemical (Hubei) Co., Ltd.;

[0061] Caprolactone-grafted hydroxy acrylate: HECLA, Wuhan Camic Technology Co., Ltd.;

[0062] Modified epoxy acrylate: B-151, Guangdong Boxin New Material Technology Co., Ltd.;

[0063] Trimethylolpropane triacrylate monomer: TMPTA, Zhanxin Resin (China) Co., Ltd.;

[0064] Example 1

[0065] An embodiment of the matte UV reverse coating oil of the present invention is shown in Table 1.

[0066] In Example 1, the preparation method of the matte UV reverse surface oil includes the following steps:

[0067] The polymeric oligomer and reactive diluent are mixed and stirred at 1300 r / min until the fineness of the polymeric prepolymer reaches below 5 μm. Then, a photoinitiator and an active amine are added and the mixture is stirred and ground at 1100 r / min until the fineness reaches below 5 μm. Additives are then added and dispersed evenly at 600 r / min to obtain the matte UV reverse surface oil.

[0068] Examples 2-9

[0069] The formulations of the matte UV reverse surface oils described in Examples 2-9 are shown in Table 1, and the preparation methods are the same as in Example 1.

[0070] Comparative Examples 1-5

[0071] The formulations of the matte UV reverse surface oils described in Comparative Examples 1-5 are shown in Table 1, and the preparation methods are the same as in Example 1.

[0072] Comparative Example 6

[0073] Comparative Example 6 is UV108 reverse surface oil from Shanghai Chenjie Printing Materials Co., Ltd.

[0074] Table 1. Formulations of matte UV reverse surface oils for Examples 1-9 and Comparative Examples 1-6

[0075]

[0076]

[0077]

[0078] Performance testing

[0079] The matte UV reverse surface oils described in Examples 1-9 and Comparative Examples 1-6 were subjected to performance tests according to the following standards:

[0080] Coating gloss: Measured at an incident angle of 60° as specified in GB / T 9754-2007;

[0081] Dryness: Determined according to QB / T 2826-2017;

[0082] Fineness: determined according to QB / T 2624-2012;

[0083] Ford cup viscosity (4 cup): determined according to GB / T 1723-1993;

[0084] Adhesion: Tested according to GB / T 9286-1998;

[0085] The test results are shown in Table 2.

[0086] In the coating gloss test, a conventional UV reverse primer was first printed onto the printed material according to the pattern design, using a UV offset printing press to print the frosted areas. Then, matte UV reverse top coats of Examples 1-9 and Comparative Examples 1-6 were printed to obtain printed materials with both matte frosted and matte flat areas. The gloss of the frosted and flat areas of the printed materials was then tested. (The conventional UV reverse primer includes the following components by weight: 35 parts aromatic polyurethane acrylate resin, 10 parts polyester acrylate, 20 parts trimethylolpropane triacrylate monomer, 10 parts 1,6-hexanediol diacrylate, 5 parts 2-hydroxy-2-methyl-1-phenyl-1-propanone photoinitiator, 5 parts 1-hydroxycyclohexylphenyl ketone photoinitiator, 10 parts talc, 5 parts polydimethylsiloxane, and 0.2 parts 510 polymerization inhibitor.)

[0087] Table 2. Performance test results of matte UV reverse surface oils in Examples 1-9 and Comparative Examples 1-5

[0088]

[0089]

[0090] Note: Table 2 shows six levels of adhesion evaluation criteria, from 0 to 5, with 0 being excellent and 5 being poor.

[0091] Table 2 shows that in Comparative Example 1, the ratio of aliphatic polyurethane acrylate to amine-modified polyether acrylate exceeded the range of 3:1 to 2; in Comparative Example 2, the mass ratio of caprolactone-grafted hydroxy acrylate to tridecyl acrylate exceeded the range of 1:0.5 to 1.5. Therefore, the matte UV reverse varnishes prepared in Comparative Examples 1 and 2 resulted in a poorer matte finish when printed on printed materials. In Comparative Example 3, modified epoxy acrylate was used to replace amine-modified polyether acrylate to prepare a polymerizable oligomer; in Comparative Example 4, trimethylolpropane triacrylate monomer was used to replace tridecyl acrylate to prepare a reactive diluent; in Comparative Example 5, the polymerizable oligomer exceeded the specified ratio in the overall matte UV reverse varnish. Therefore, the matte UV reverse varnishes prepared in Comparative Examples 3 and 5 resulted in a poorer matte finish when printed on printed materials. In Comparative Example 6, a commercially available UV reverse varnish was used for printing, and the areas on the printed material without the UV reverse base coat showed a poorer matte finish. When the matte UV reverse coating of Examples 1-9 of the present invention is printed on printed materials, both areas with and without UV reverse coating have a good matte effect, which is significantly higher than that of Comparative Examples 1-6. Areas with UV reverse coating have a strong matte frosted feel.

[0092] The matte UV reverse coating of this invention can be printed on printed materials as needed using a UV offset ink printer. Upon contact with the UV reverse base coat, a cohesive reaction occurs instantly on the printed surface, forming a small-particle, sandy-textured ink film. Areas without the UV reverse base coat exhibit a high-gloss, flat effect, resulting in a clear distinction between matte and glossy areas on the entire printed surface. This produces printed materials with both matte and smooth areas. The polymerizable oligomer in the matte UV reverse coating is a combination of aliphatic polyurethane acrylate and amine-modified polyether acrylate, while the reactive diluent is a combination of caprolactone-grafted hydroxyl acrylate and tridecyl acrylate. The matte UV reverse coating prepared by the polymerizable oligomer, reactive diluent, and other components has a good matte effect. The areas where the matte UV reverse coating and UV reverse base coat are printed in series have a strong matte, sandy feel. Furthermore, the matte UV reverse coating of this invention contains no benzene solvents, has a low odor, and is minimally harmful to human health. The preparation method of the matte UV reverse surface oil of this invention is simple to operate, has good repeatability, can be mass-produced in a standardized manner, and has good market prospects.

[0093] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A matte UV reverse coating oil, characterized in that, It comprises the following components by weight: 40-50 parts of polymerizable oligomer, 20-30 parts of reactive diluent, 5-15 parts of reactive amine, 5-15 parts of photoinitiator, and 1-10 parts of additive; wherein the polymerizable oligomer comprises aliphatic polyurethane acrylate and amine-modified polyether acrylate. The mass ratio of aliphatic polyurethane acrylate to amine-modified polyether acrylate in the polymeric oligomer is 3:1 to 2. The reactive diluent comprises caprolactone-grafted hydroxy acrylate and tridecyl acrylate; The mass ratio of caprolactone-grafted hydroxy acrylate and tridecyl acrylate in the reactive diluent is 1:0.5 to 1.

5.

2. The matte UV reverse coating as described in claim 1, characterized in that, The aliphatic polyurethane acrylate has a functionality of 2, an active ingredient content of 100%, a viscosity of 800–1200 cps at 25°C, a molecular weight of 800–1100, and a refractive index of 1.4–1.

5. The amine-modified polyether acrylate has a functionality of 4, an effective component of 99%, a viscosity of 2800–3200 cps at 25°C, a molecular weight of 800–1200, and a refractive index of 1.45–1.

55.

3. The matte UV reverse coating as described in claim 1, characterized in that, The caprolactone-grafted hydroxy acrylate has a functionality of 1, a viscosity of 60-100 cps at 25°C, a molecular weight of 320-360, a refractive index of 1.45-1.55, and an acid value of ≤6 mgKOH / g. The tridecyl acrylate has a functionality of 1, a viscosity of 1–50 cps at 25°C, a molecular weight of 240–290, and a refractive index of 1.45–1.

55.

4. The matte UV reverse coating as described in claim 1, characterized in that, The active amine is one or a combination of two or more of ethylenediamine, propylenediamine, and isopropylenediamine; The photoinitiator is one or a combination of two or more of the following: ethyl 4-dimethylaminobenzoate, 2-hydroxy-2-methyl-1-phenyl-1-propanone, and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide. The additive is one or a combination of two or more of the following: defoamer, leveling agent, and polymerization inhibitor.

5. A method for preparing a matte UV reverse-coating oil according to any one of claims 1 to 4, characterized in that, Includes the following steps: The polymeric oligomer is mixed with an active diluent and stirred until homogeneous to obtain a polymeric prepolymer. Then, a photoinitiator and an active amine are added and stirred to obtain a mixture. Additives are then added and stirred to obtain the matte UV reverse surface oil.

6. The method for preparing matte UV reverse surface oil as described in claim 5, characterized in that, The polymeric oligomer and the reactive diluent are stirred at 1200-1400 r / min until the fineness of the polymeric prepolymer reaches below 5 μm; The polymeric prepolymer, photoinitiator, and active amine are stirred at 1000–1200 r / min until the fineness of the mixture reaches below 5 μm; The mixture and additives are dispersed evenly at 500-700 r / min to obtain the matte UV reverse surface oil.

7. The application of the matte UV reverse coating according to any one of claims 1 to 4, characterized in that, By printing the matte UV reverse topcoat on a printed material coated with a conventional UV reverse base coat, a printed material with both matte frosted areas and matte flat areas is obtained.

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