Battery aluminum plastic film UV-LED curing inkjet ink and its preparation method and application method

Abstract

The present application relates to the field of inkjet printing technology, and particularly relates to a battery aluminum plastic film UV-LED curing jet printing ink and a preparation method and application method thereof, the jet printing ink comprises the following components by mass fraction: polyurethane modified acrylate resin 33%; monomer 55%; photoinitiator 7-9%; dispersant 0.3-0.7%; leveling agent 0.3-0.7%; pigment 1-5%. The preparation method of the jet printing ink is as follows: polyurethane modified acrylate resin, monomer, photoinitiator, dispersant, leveling agent and pigment are weighed, polyurethane modified acrylate resin, dispersant, pigment, leveling agent, photoinitiator, monomer are sequentially added in a low-speed stirring stage, then high-speed stirring is carried out, and then grinding is carried out to a fineness of less than or equal to 500 nm, so that the jet printing ink is obtained. Compared with the prior art, the beneficial effects of the present application are as follows: compared with the traditional UV ink, the jet printing ink has better alcohol resistance, easy rework performance and good adhesion.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inkjet printing technology, and particularly relates to a battery aluminum plastic film UV-LED curing inkjet ink and a preparation method and application method thereof. BACKGROUND

[0002] With the market demand for increasing variable two-dimensional codes, product traceability and other related functions, and the requirement for environmental protection, the traditional silk / screen printing scheme is gradually replaced by the UV inkjet printing method. Currently, ordinary UV ink has three performances on the surface of the battery aluminum plastic film: the first is basically no adhesion; the second can meet the adhesion requirement but is not resistant to alcohol wiping; and the third has adhesion and is resistant to alcohol wiping but cannot be reworked. SUMMARY

[0003] In order to overcome the following three defects of the UV ink in the prior art:

[0004] (1) basically no adhesion;

[0005] (2) can meet the adhesion requirement but is not resistant to alcohol wiping;

[0006] (3) has adhesion and is resistant to alcohol wiping but cannot be reworked,

[0007] The present application provides a battery aluminum plastic film UV-LED curing inkjet ink, which can well meet the three requirements of adhesion, alcohol wiping resistance and reworkability, and can greatly meet the production demand.

[0008] The purpose of the present application is achieved by the following technical solutions:

[0009] One of the technical solutions of the present application provides a battery aluminum plastic film UV-LED curing inkjet ink, which comprises the following components by mass fraction: polyurethane modified acrylate resin 25-35%; monomer 53-63%; photoinitiator 7-9%; dispersant 0.3-0.7%; leveling agent 0.3-0.7%; pigment 1-5%.

[0010] Further, the monomer is a mixture obtained by mixing cyclo-trishydroxymethylpropane formal acrylate, 1,6-hexanediol diacrylate and tetrahydrofuran acrylate in any proportion.

[0011] Further, the mass ratio of the cyclic trihydroxymethyl propane formaldehyde acrylate, 1,6-hexanediol diacrylate and tetrahydrofuran acrylate is 30: 15-20: 5-10. The cyclic trihydroxymethyl propane formaldehyde acrylate has good adhesion, and adding this monomer can effectively improve the adhesion of the ink on the aluminum plastic film, but the Tg point of the monomer is low, and adding too much will affect the surface hardness of the paint film and cause poor wear resistance. The 1,6-hexanediol diacrylate can increase the overall crosslinking, so that the ink is more resistant to alcohol, but too much addition will increase the difficulty of reworking the ink. The viscosity of the tetrahydrofuran acrylate is relatively low, the reaction is fast, the surface drying speed of the ink can be improved, and the overall viscosity of the ink can be reduced, but the tetrahydrofuran acrylate volatilizes relatively fast, and too much addition will cause poor state of the inkjet head and affect continuous printing. The three kinds of monomers synergistically cooperate in the above ratio range to ensure the alcohol resistance, easy reworking performance and adhesion on the aluminum plastic film of the ink; when the amount of the three kinds of monomers is too small, they will not work or have little effect.

[0012] Further, the photoinitiator is a mixture obtained by mixing 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide, phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide and 2-isopropylthioxanthone in any ratio.

[0013] Further, the mass ratio of the 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide, phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide and 2-isopropylthioxanthone is 2: 1-5: 1-5. The 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide and phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide have better absorption peaks at 365 nm and 395 nm wave bands, and can more effectively initiate curing than other photoinitiators for a coating system containing pigments. Adding 2-isopropylthioxanthone can more effectively promote deep curing effect. Too much photoinitiator will reduce the curing rate, and too high concentration of the photoinitiator has the following two hazards: first, too much non-cured material of the photoinitiator will weaken the chemical resistance and physical properties of the coating; second, as the ratio of the surface polymerization speed to the crosslinking rate of the coating body increases, different stresses appear in the coating, which will cause the coating to shrink and crack. The three kinds of monomers synergistically cooperate in the above ratio range to ensure the curing rate and curing effect; when the amount of the three kinds of photoinitiators is too small, they will not work or have little effect.

[0014] Further, the inkjet ink comprises the following components in mass fraction: polyurethane modified acrylate resin 30-35%; monomer 53-60%; photoinitiator 8%; dispersant 0.5%; leveling agent 0.5%; pigment 3%.

[0015] Further, the pigment is one or more of titanium dioxide, phthalocyanine blue, phthalocyanine green, carbon black, and lemon yellow.

[0016] Further, the dispersant is EFKA 4310.

[0017] Further, the leveling agent is BYK-3510.

[0018] The second technical solution of the present application provides a preparation method of the above-mentioned jet printing ink, which comprises the following steps:

[0019] The polyurethane modified acrylate resin, monomer, photoinitiator, dispersant, leveling agent, and pigment are weighed, and the polyurethane modified acrylate resin, dispersant, pigment, leveling agent, photoinitiator, and monomer are sequentially added in the low-speed stirring stage, followed by high-speed stirring, and then grinding to a fineness of ≤500 nm to obtain the jet printing ink.

[0020] Further, the speed of low-speed stirring is 1000-1500 r / min, and the stirring time is 10-15 min.

[0021] Further, the speed of high-speed stirring is 3500-4000 r / min, and the stirring time is 20-25 min.

[0022] The third technical solution of the present application provides an application method of the above-mentioned jet printing ink, which comprises the following steps:

[0023] The aluminum-plastic film is subjected to corona treatment, then the ink is jet printed on the treated aluminum-plastic film, and finally UV-LED lamp is used for light curing.

[0024] Further, after the corona treatment, the Darcy value of the surface of the aluminum-plastic film is ≥38 mN / m.

[0025] Further, after the corona treatment, the jet printing is performed within 1 hour.

[0026] Further, the ignition frequency of the light curing process is 18000-25000 Hz.

[0027] Further, in the light curing process, pre-curing is performed first, and then deep curing is performed.

[0028] Further, in the pre-curing process, the irradiation time is 0.8-1.0 second, the energy density is 1000-1800 mJ / cm 2 , and the light wavelength is 395 nm.

[0029] Further, in the deep curing process, the 395 nm waveband is used first, and the energy density is 15000-18000 mJ / cm 2, the curing time is 2-3 seconds; then using 365nm waveband, the energy density is 15000-18000mJ / cm 2 , the curing time is 2-3 seconds.

[0030] Further, the film thickness obtained after jet printing and curing is 5-7 microns.

[0031] The curing mechanism of the jet printing ink of the application is as follows:

[0032] Under the irradiation of ultraviolet light, the photoinitiator absorbs the radiation energy of ultraviolet light and splits into free radicals, initiates the polymerization, crosslinking and grafting reaction of the prepolymer, and is cured into a network polymer in a very short time. The application adopts UV-LED lamp curing, and the existing UV-LED lamp ultraviolet light waveband is distributed at 365nm and 395nm. The photoinitiator selected in the application has an absorption peak at this waveband, and the curing effect is obvious. The use of polyurethane modified acrylate resin can effectively increase the adhesion of the ink on the surface of the substrate. In combination with the characteristics of 1,6-hexanediol diacrylate monomer, the balance of the ink alcohol resistance performance and easy repair and rework can be effectively adjusted (increasing the amount of the monomer can improve the alcohol resistance of the ink, but at the same time, it increases the difficulty of rework of the ink, and reducing the amount of the monomer, the alcohol resistance of the ink will also decrease). Under the condition of meeting the performance, the low viscosity monomer is added to adjust the viscosity of the ink (15-20cp / 25℃), which meets the jet printing requirements.

[0033] The application has the following beneficial effects:

[0034] Compared with the traditional UV ink, the jet printing ink of the application has better alcohol resistance, easy rework performance, and better adhesion: using 3M-600 adhesive tape to test 5 times at the same position, no falling off for 5 times; using alcohol with a purity of more than 99%, 500g pressure, and a test speed of 42 times / min, the alcohol resistance number can reach 45 times; the fastest 20s can be wiped clean. DETAILED DESCRIPTION

[0035] In the following examples, unless otherwise specified, the raw materials or processing techniques used are all conventional commercially available raw material products or conventional processing techniques in the art.

[0036] In the following examples, the pigments used are one or more of titanium dioxide, phthalocyanine blue, phthalocyanine green, carbon black, and lemon yellow.

[0037] In the following examples, the dispersing agent used is EFKA 4310, and the leveling agent used is BYK-3510.

[0038] In the following examples, the aluminum plastic film is first subjected to corona treatment, then the prepared ink is sprayed on the treated aluminum plastic film, and finally UV-LED lamp is used for light curing. After corona treatment, the surface of the aluminum plastic film reaches a durometer value of ≥38 mN / m. After corona treatment, spraying is performed within 1 hour, and then UV-LED lamp is used for light curing. Pre-curing is performed first, followed by deep curing. Ignition frequency: 18000-25000 Hz, pre-curing: 1000-1800 mJ / cm 2 , curing time 0.8-1.0 seconds; deep curing: first 395 nm band, 15000-18000 mJ / cm 2 , curing time 2-3 seconds; then 365 nm band, 15000-18000 mJ / cm 2 , curing time 2-3 seconds. After spraying and curing, the film thickness is 5-7 μm. The film obtained after spraying is detected.

[0039] In the following examples, the battery aluminum plastic film ink detection standard is:

[0040] Item Standard Method Adhesion No peeling 3M-600 tape, same position, 5 times Alcohol resistance 30 times, no obvious change Alcohol with purity of 99%, 500g pressure, test speed 42 times / min Abrasion resistance 35 times, no obvious change Special rubber, 500g pressure, test speed 42 times / min Salt water resistance 35 times, no obvious change 5% NaCl solution, 500g pressure, test speed 42 times / min Acid sweat resistance 35 times, no obvious change PH=4.7±0.1 artificial sweat, 500g pressure, test speed 42 times / min Neutral sweat resistance 35 times, no obvious change PH=6.5±0.1 artificial sweat, 500g pressure, test speed 42 times / min Alkaline sweat resistance 35 times, no obvious change PH=8.8±0.1 artificial sweat, 500g pressure, test speed 42 times / min Repairable Wipe clean within 1 minute, no black spot residue, and no damage to the aluminum plastic film, side sealant, etc. Use a clean cloth to wipe the printed content Example 1

[0041] In this embodiment, a battery aluminum plastic film UV-LED curing inkjet ink is prepared, and the formula ratio is (weight percentage):

[0042] Polyurethane modified acrylate resin 25 1,6-hexanediol diacrylate 20 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 Tetrahydrofurfuryl acrylate 13 Phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide 3 Dispersant 0.5 2-isopropylthioxanthone 3 Pigment 3 Cyclotrimethylolpropane formal acrylate 30 Leveling agent 0.5

[0043] The manufacturing method of the battery aluminum plastic film UV-LED curing inkjet ink is as follows: first, the raw materials are weighed according to the formula ratio, and then polyurethane modified acrylate resin 25 parts, dispersant 0.5 parts, pigment 3 parts, leveling agent 0.5 parts, photoinitiator: 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 parts, phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide 3 parts, 2-isopropyl thioxanthone 3 parts, monomer: cyclo-trihydroxymethyl propane formaldehyde acrylate 30 parts, 1,6-hexanediol diacrylate 20 parts, tetrahydrofuran acrylate 13 parts, high-speed stirring 25 minutes (4000 r / min). After dispersion, it is ground in a sand mill to a fineness of ≦500 nm.

[0044] Performance test results:

[0045] Test item Test result Adhesion / 3M-600 tape, same position, 5 times NG Alcohol resistance / Alcohol with purity of 99%, 500g pressure, test speed 42 times / min 10 times Abrasion resistance / Special rubber, 500g pressure, test speed 42 times / min 20 times Salt water resistance / 5% NaCl solution, 500g pressure, test speed 42 times / min 25 times Acid sweat resistance / PH=4.7±0.1 artificial sweat, 500g pressure, test speed 42 times / min 20 times Alkaline sweat resistance / PH=8.8±0.1 artificial sweat, 500g pressure, test speed 42 times / min 25 times Repairable / Wipe clean within 1 minute, no black spot residue, and no damage to the aluminum plastic film, side sealant, etc. 20s clean Example 2

[0046] Specific embodiment: battery aluminum plastic film UV-LED curing inkjet ink, formula ratio (weight percentage):

[0047] Polyurethane modified acrylate resin 30 1,6-hexanediol diacrylate 20 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 Tetrahydrofurfuryl acrylate 8 Phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide 3 Dispersant 0.5 2-isopropylthioxanthone 3 Pigment 3 Cyclotrimethylolpropane formal acrylate 30 Leveling agent 0.5

[0048] The manufacturing method of the battery aluminum-plastic film UV-LED curing inkjet printing ink is as follows: first, the raw materials are weighed according to the formula proportion, and then the polyurethane modified acrylate resin 30 parts, the dispersant 0.5 parts, the pigment 3 parts, the leveling agent 0.5 parts, the photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 parts, phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide 3 parts, 2-isopropylthioxanthone 3 parts, the monomer: cyclo-trihydroxymethyl propane formal acrylate 30 parts, 1,6-hexanediol diacrylate 20 parts, and tetrahydrofuran acrylate 8 parts are added in sequence in the low-speed stage (1500 r / min, 15 min), and then high-speed stirring is performed for 25 minutes (4000 r / min). After the dispersion is completed, the sand mill is ground to a fineness of ≦500 nm.

[0049] Performance test results:

[0050] Test item Test result Adhesion / 3M-600 tape, same position, 5 times 3 times without peeling Alcohol resistance / Alcohol with purity of 99%, 500g pressure, test speed 42 times / min 30 times Abrasion resistance / Special rubber, 500g pressure, test speed 42 times / min 35 times Salt water resistance / 5% NaCl solution, 500g pressure, test speed 42 times / min 30 times Acidic sweat resistance / artificial sweat PH = 4.7 ± 0.1, 500g pressure, test speed 42 times / min 40 times Alkaline sweat resistance / artificial sweat PH = 8.8 ± 0.1, 500g pressure, test speed 42 times / min 40 times Repairable / wiped clean within 1 minute, no black spot residue, and no damage to the aluminum plastic film, side sealant, etc. 50s wiped clean Example 3

[0051] Specific embodiment: the formula ratio of the battery aluminum-plastic film UV-LED curing inkjet printing ink is (weight percentage):

[0052] Polyurethane modified acrylate resin 35 1,6-hexanediol diacrylate 20 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 Tetrahydrofurfuryl acrylate 3 Phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide 3 Dispersant 0.5 2-isopropylthioxanthone 3 Pigment 3 Cyclotrimethylolpropane formal acrylate 30 Leveling agent 0.5

[0053] The manufacturing method of the battery aluminum-plastic film UV-LED curing inkjet printing ink is as follows: first, the raw materials are weighed according to the formula proportion, and then the polyurethane modified acrylate resin 30 parts, the dispersant 0.5 parts, the pigment 3 parts, the leveling agent 0.5 parts, the photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 parts, phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide 3 parts, 2-isopropylthioxanthone 3 parts, the monomer: cyclo-trihydroxymethyl propane formal acrylate 30 parts, 1,6-hexanediol diacrylate 20 parts, and tetrahydrofuran acrylate 8 parts are added in sequence in the low-speed stage (1500 r / min, 15 min), and then high-speed stirring is performed for 25 minutes (4000 r / min). After the dispersion is completed, the sand mill is ground to a fineness of ≦500 nm.

[0054] Performance test results:

[0055] Test item Test result Adhesion / 3M-600 tape, 5 times of pull test at the same position 5 times no falling off Alcohol resistance / alcohol with purity greater than 99%, 500g pressure, test speed 42 times / min 45 times Wear resistance test / special rubber skin, 500g pressure, test speed 42 times / min 45 times Salt water resistance / 5% NaCl solution, 500g pressure, test speed 42 times / min 45 times Acidic sweat resistance / artificial sweat PH = 4.7 ± 0.1, 500g pressure, test speed 42 times / min 45 times Alkaline sweat resistance / artificial sweat PH = 8.8 ± 0.1, 500g pressure, test speed 42 times / min 55 times Repairable / wiped clean within 1 minute, no black spot residue, and no damage to the aluminum plastic film, side sealant, etc. 1min20s wiped clean Example 4

[0056] Specific embodiment: the formula ratio of the battery aluminum-plastic film UV-LED curing inkjet printing ink is (weight percentage):

[0057] Polyurethane modified acrylate resin 33 1,6-hexanediol diacrylate 20 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 Tetrahydrofurfuryl acrylate 5 Phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide 3 Dispersant 0.5 2-isopropylthioxanthone 3 Pigment 3 Cyclotrimethylolpropane formal acrylate 30 Leveling agent 0.5

[0058] The manufacturing method of the battery aluminum plastic film UV-LED curing inkjet ink is as follows: first, the raw materials are weighed according to the formula proportion, and then the polyurethane modified acrylate resin 33 parts, the dispersant 0.5 parts, the pigment 3 parts, the leveling agent 0.5 parts, the photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 parts, the phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide 3 parts, the 2-isopropylthioxanthone 3 parts, the monomer: cyclo-trihydroxymethyl propane formaldehyde acrylate 30 parts, 1,6-hexanediol diacrylate 20 parts, and tetrahydrofuran acrylate 5 parts are added in sequence in the low-speed stage (1500 r / min, 15 min), and then high-speed stirring is performed for 25 minutes (4000 r / min), and after the dispersion is completed, the sand mill is ground to a fineness of ≦500 nm.

[0059] Performance test results:

[0060] Test item Test result Adhesion / 3M-600 tape, 5 times of pull test at the same position 5 times no falling off Alcohol resistance / alcohol with purity greater than 99%, 500g pressure, test speed 42 times / min 40 times Wear resistance test / special rubber skin, 500g pressure, test speed 42 times / min 40 times Salt water resistance / 5% NaCl solution, 500g pressure, test speed 42 times / min 40 times Acidic sweat resistance / artificial sweat PH = 4.7 ± 0.1, 500g pressure, test speed 42 times / min 40 times Alkaline sweat resistance / artificial sweat PH = 8.8 ± 0.1, 500g pressure, test speed 42 times / min 50 times Repairable / wiped clean within 1 minute, no black spot residue, and no damage to the aluminum plastic film, side sealant, etc. 60s wiped clean Example 5

[0061] Specific embodiment: the formula of the battery aluminum plastic film UV-LED curing inkjet ink is as follows (weight percentage):

[0062] Polyurethane modified acrylate resin 33 1,6-hexanediol diacrylate 15 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 Tetrahydrofurfuryl acrylate 10 Phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide 3 Dispersant 0.5 2-isopropylthioxanthone 3 Pigment 3 Cyclotrimethylolpropane formal acrylate 30 Leveling agent 0.5

[0063] The manufacturing method of the battery aluminum plastic film UV-LED curing inkjet ink is as follows: first, the raw materials are weighed according to the formula proportion, and then the polyurethane modified acrylate resin 33 parts, the dispersant 0.5 parts, the pigment 3 parts, the leveling agent 0.5 parts, the photoinitiator 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 parts, the phenyl bis (2,4,6-trimethylbenzoyl) phosphine oxide 3 parts, the 2-isopropylthioxanthone 3 parts, the monomer: cyclo-trihydroxymethyl propane formaldehyde acrylate 30 parts, 1,6-hexanediol diacrylate 20 parts, and tetrahydrofuran acrylate 5 parts are added in sequence in the low-speed stage (1500 r / min, 15 min), and then high-speed stirring is performed for 25 minutes (4000 r / min), and after the dispersion is completed, the sand mill is ground to a fineness of ≦500 nm.

[0064] Performance test results:

[0065] Test item Test result Adhesion / 3M-600 tape, 5 times at the same position 5 times no peeling Alcohol resistance / alcohol with purity greater than 99%, 500 g pressure, test speed 42 times / min 35 times Abrasion resistance test / special rubber skin, 500 g pressure, test speed 42 times / min 37 times Salt water resistance / 5% NaCl solution, 500 g pressure, test speed 42 times / min 37 times Acid sweat resistance / artificial sweat with PH = 4.7 ± 0.1, 500 g pressure, test speed 42 times / min 36 times Alkaline sweat resistance / artificial sweat with PH = 8.8 ± 0.1, 500 g pressure, test speed 42 times / min 40 times Repairable / wiped clean within 1 minute, no black spot residue, and no damage to the aluminum plastic film, side sealant, etc. 40s wiped clean Example 6

[0066] Specific embodiment: the formula of the battery aluminum plastic film UV-LED curing inkjet ink is as follows (weight percentage):

[0067] Polyurethane-modified acrylate resin 33 1,6-hexanediol diacrylate 10 2,4,6-trimethylbenzoyl-diphenylphosphine oxide 2 Tetrahydrofurfuryl acrylate 15 Phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide 3 Dispersant 0.5 2-isopropylthioxanthone 3 Pigment 3 Cyclotrimethylolpropane formal acrylate 30 Leveling agent 0.5

[0068] The method for manufacturing the battery aluminum-plastic film UV-LED curing inkjet ink comprises the following steps: first, raw materials are weighed according to the formula proportion; then, polyurethane modified acrylate resin 33 parts, dispersant 0.5 parts, pigment 3 parts, leveling agent 0.5 parts, photoinitiator: 2,4,6-trimethylbenzoyl-diphenyl phosphine oxide 2 parts, phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide 3 parts, 2-isopropyl thioxanthone 3 parts, monomer: cyclo-trihydroxymethyl propane formal acrylate 30 parts, 1,6-hexanediol diacrylate 10 parts, tetrahydrofuran acrylate 15 parts are added in turn in the low-speed stage (1500 r / min, 15 min); and high-speed stirring is performed for 25 minutes (4000 r / min).

[0069] Performance test results:

[0070] Test item Test result Adhesion / 3M-600 tape, 5 times at the same position 5 times no peeling Alcohol resistance / alcohol with purity greater than 99%, 500 g pressure, test speed 42 times / min 28 times Abrasion resistance test / special rubber skin, 500 g pressure, test speed 42 times / min 35 times Salt water resistance / 5% NaCl solution, 500 g pressure, test speed 42 times / min 33 times Acid sweat resistance / artificial sweat with PH = 4.7 ± 0.1, 500 g pressure, test speed 42 times / min 35 times Alkaline sweat resistance / artificial sweat with PH = 8.8 ± 0.1, 500 g pressure, test speed 42 times / min 30 times Repairable / wiped clean within 1 minute, no black spot residue, and no damage to the aluminum plastic film, side sealant, etc. 30s wiped clean

[0071] As can be seen from the above examples, considering cost and performance, the inkjet ink prepared in Example 5 has better performance.

Claims

1. A UV-LED curable inkjet printing ink for battery aluminum-plastic film, characterized in that, The composition comprises the following components by mass fraction: 33% polyurethane modified acrylate resin; 55% monomer; 7-9% photoinitiator; 0.3-0.7% dispersant; 0.3-0.7% leveling agent; and 1-5% pigment. The monomer is a mixture of cyclotrimethylolpropane methyl acetal acrylate, 1,6-hexanediol diacrylate, and tetrahydrofuran acrylate in a mass ratio of 30:15-20:5-10. The photoinitiator is a mixture of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and 2-isopropylthioxanthraquinone in a mass ratio of 2:1-5:1-5.

2. The battery aluminum-plastic film UV-LED curable inkjet printing ink according to claim 1, characterized in that, The components include the following components by mass fraction: 33% polyurethane modified acrylate resin; 55% monomer; 8% photoinitiator; 0.5% dispersant; 0.5% leveling agent; and 3% pigment.

3. The battery aluminum-plastic film UV-LED curable inkjet printing ink according to claim 1, characterized in that, The pigment is one or more of titanium dioxide, phthalocyanine blue, phthalocyanine green, carbon black, and lemon yellow.

4. The method for preparing a battery aluminum-plastic film UV-LED curable inkjet printing ink as described in any one of claims 1-3, characterized in that, Includes the following steps: Weigh out polyurethane-modified acrylate resin, monomer, photoinitiator, dispersant, leveling agent and pigment. Add polyurethane-modified acrylate resin, dispersant, pigment, leveling agent, photoinitiator and monomer in sequence during the low-speed stirring stage. Then stir at high speed and grind to obtain the inkjet ink.

5. The application method of the battery aluminum-plastic film UV-LED curable inkjet printing ink as described in any one of claims 1-3, characterized in that, Includes the following steps: The aluminum-plastic film is subjected to corona treatment, then ink is sprayed onto the treated aluminum-plastic film, and finally UV-LED lamp is used for photocuring. After corona treatment, the dyne value of the aluminum-plastic film surface is ≥38mN / m; The ignition frequency of the photocuring process is 18000~25000Hz; In the photocuring process, pre-curing is performed first, followed by deep curing: During the pre-curing process, the irradiation time is 0.8-1.0 seconds, and the energy density is 1000-1800 mJ / cm³. 2 The wavelength of the light is 395nm; During the deep curing process, the 395nm wavelength band is used first, with an energy density of 15000–18000 mJ / cm². 2 The curing time is 2-3 seconds; then, using the 365nm wavelength, the energy density is 15000-18000 mJ / cm². 2 The curing time is 2-3 seconds; The thickness of the film obtained after inkjet printing and curing is 5–7 μm.