A scratch-off water-based ink, its preparation method and application

Abstract

This invention provides a scratch-off water-based ink, its preparation method, and its application, belonging to the field of water-based ink technology. The scratch-off water-based ink provided by this invention comprises, by mass percentage: 30-50% water-based emulsion, 25-30% color paste, 0.1-1% defoamer, 0.1-3% leveling agent, 1-3% dispersant, and 15-30% water; the water-based emulsion includes water-based polyurethane emulsion and water-based alcohol ester emulsion; the mass ratio of the water-based polyurethane emulsion to the water-based alcohol ester emulsion is (1-3):1. This invention uses water-based polyurethane emulsion and water-based alcohol ester emulsion as binders, which can significantly improve the rollability of the water-based ink, prevents hand mess when rubbed, and results in excellent scratch-off performance.

Description

Technical Field

[0001] This invention belongs to the field of water-based ink technology, specifically relating to a scratch-off water-based ink, its preparation method, and its application. Background Technology

[0002] Scratch-off ink has a wide range of applications in production and daily life, such as printing lottery tickets, coupons, receipts, telephone recharge cards, game cards, internet access cards, raffle cards, learning cards, anti-counterfeiting identification cards with electronic codes, quick-display booklets, and children's scratch art.

[0003] Several patents in the prior art have researched and improved scratch-off inks. For example, patent CN110791144A discloses a scratch-off water-based gray ink for screen printing and its preparation method; patent CN104774500A discloses a water-based flexographic scratch-off white ink and its preparation method and application; and patent CN106867307A discloses a method for preparing a water-based black scratch-off ink. However, these scratch-off inks still have shortcomings in practical applications. For example, the rollability of the scratched ink layer is poor, resulting in ink residue that easily soils hands and affects the user's scratching experience. Therefore, how to improve the scratch-off performance of water-based inks has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a scratch-off water-based ink, its preparation method, and its application. The water-based ink provided by this invention possesses excellent scratch-off properties.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a scratchable water-based ink, comprising the following components by weight percentage: 30-50% water-based emulsion, 25-30% color paste, 0.1-1% defoamer, 0.1-3% leveling agent, 1-3% dispersant, and 15-30% water; The aqueous emulsion includes aqueous polyurethane emulsion and aqueous alcohol ester emulsion; The mass ratio of the aqueous polyurethane emulsion to the aqueous alcohol ester emulsion is (1~3):1.

[0006] Preferably, the scratchable water-based ink comprises, by weight percentage: 34-45% water-based emulsion, 26-28% color paste, 0.2-0.8% defoamer, 0.5-2.5% leveling agent, 1.5-2.5% dispersant, and 20-25% water.

[0007] Preferably, the mass ratio of the aqueous polyurethane emulsion to the aqueous alcohol ester emulsion is 2:1.

[0008] Preferably, the color paste includes a white paste or a black paste.

[0009] Preferably, the defoamer includes an organosilicone defoamer.

[0010] Preferably, the dispersant includes BYK-163 and sodium lignosulfonate.

[0011] Preferably, the mass ratio of BYK-163 to sodium lignosulfonate is 1:(2~5).

[0012] Preferably, the fineness of the scratchable water-based ink is ≤10μm.

[0013] The present invention also provides a method for preparing the scratch-off water-based ink described in the above technical solution, comprising: A water-based emulsion, color paste, defoamer, leveling agent, dispersant and water are mixed to obtain a scrapable water-based ink.

[0014] The present invention also provides the application of the scratch-off water-based ink described in the above technical solution or the scratch-off water-based ink prepared by the preparation method described in the above technical solution in gravure printing.

[0015] This invention provides a scratch-off water-based ink, comprising the following components by weight percentage: 30-50% water-based emulsion, 25-30% color paste, 0.1-1% defoamer, 0.1-3% leveling agent, 1-3% dispersant, and 15-30% water; the water-based emulsion includes water-based polyurethane emulsion and water-based alcohol ester emulsion; the mass ratio of the water-based polyurethane emulsion to the water-based alcohol ester emulsion is (1-3):1. This invention uses water-based polyurethane emulsion and water-based alcohol ester emulsion as binders, which can significantly improve the rollability of the water-based ink, prevent hand-twisting and result in excellent scratch-off performance. Experimental results show that the water-based ink provided by this invention has excellent scratch-off performance. Detailed Implementation

[0016] This invention provides a scratchable water-based ink, comprising the following components by weight percentage: 30-50% water-based emulsion, 25-30% color paste, 0.1-1% defoamer, 0.1-3% leveling agent, 1-3% dispersant, and 15-30% water; The aqueous emulsion includes aqueous polyurethane emulsion and aqueous alcohol ester emulsion; The mass ratio of the aqueous polyurethane emulsion to the aqueous alcohol ester emulsion is (1~3):1.

[0017] The present invention does not have any special limitations on the source of the above components; commercially available products known to those skilled in the art can be used.

[0018] By weight percentage, the scratch-off water-based ink provided by this invention comprises 30-50% water-based emulsion; the water-based emulsion comprises water-based polyurethane emulsion and water-based alcohol ester emulsion; the weight ratio of the water-based polyurethane emulsion to the water-based alcohol ester emulsion is (1-3):1. This invention, by using water-based polyurethane emulsion and water-based alcohol ester emulsion as binders, achieves a synergistic effect that significantly improves the rollability of the water-based ink, prevents messy hands when twisted, and results in excellent scratch-off performance.

[0019] In one embodiment, the mass percentage of the aqueous emulsion can be 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, or 49%; and the mass ratio of the aqueous polyurethane emulsion to the aqueous alcohol ester emulsion can be 2:1.

[0020] In one embodiment, the waterborne polyurethane emulsion may be AH1604A from Anhui Anda Huatai New Materials Co., Ltd.; and the waterborne alcohol ester emulsion may be GS-601 waterborne acrylic modified alkyd resin from Guangshu Chemical Technology Co., Ltd.

[0021] By weight percentage, the scratch-off water-based ink provided by this invention further includes 25-30% color paste; the color paste preferably includes white or black paste. This invention does not have a particular limitation on the source of the white or black paste; any white or black paste well known to those skilled in the art can be used. In this invention, the color paste is used to impart color to the ink.

[0022] In one embodiment, the mass percentage of the color paste can be 26%, 27%, 28%, or 29%; the color paste can be a color paste from Handan Tengke Chemical Distribution Co., Ltd.

[0023] The scratchable water-based ink provided by this invention further includes 0.1-1% defoamer by weight percentage; the defoamer is preferably an organosilicone defoamer. This invention does not specifically limit the organosilicone defoamer used, and any organosilicone defoamer well-known to those skilled in the art can be used. As one embodiment, the weight percentage of the defoamer can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, or 0.9%.

[0024] The scratchable water-based ink provided by this invention further includes 0.1-3% leveling agent by weight percentage. This invention does not impose any particular limitation on the type of leveling agent; any leveling agent well-known to those skilled in the art can be used. As one embodiment, the leveling agent can be BYK-333; the weight percentage of the leveling agent can be 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.5%, 2%, or 2.5%.

[0025] The scratch-off water-based ink provided by this invention, by weight percentage, further includes 1-3% dispersant; the dispersant preferably includes BYK-163 and sodium lignosulfonate; the preferred weight ratio of BYK-163 to sodium lignosulfonate is 1:(2-5). As one embodiment, the weight ratio of BYK-163 to sodium lignosulfonate can be 1:3 or 1:4; the weight percentage of the dispersant can be 2%. The use of a dispersant in this invention enables more uniform dispersion of the various substances.

[0026] The scratchable water-based ink provided by this invention further includes 15-30% water by weight percentage. As one embodiment, the water weight percentage can be 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, or 29%; the water can be deionized water.

[0027] In this invention, the fineness of the scrapable water-based ink is preferably ≤10μm.

[0028] This invention uses water-based polyurethane emulsion and water-based alcohol ester emulsion as binders, which can significantly improve the rollability of water-based inks, prevent hands from getting dirty when twirled, and make the scraping performance excellent.

[0029] The present invention also provides a method for preparing the scratch-off water-based ink described in the above technical solution, comprising: A water-based emulsion, color paste, defoamer, leveling agent, dispersant and water are mixed to obtain a scrapable water-based ink.

[0030] The present invention does not impose any special limitations on the operation of mixing the aqueous emulsion, color paste, defoamer, leveling agent, dispersant and water, and any technical solution for preparing the mixture well known to those skilled in the art can be used.

[0031] After mixing, the present invention preferably filters the product obtained by mixing to obtain a scrapable water-based ink.

[0032] The present invention does not impose any special limitations on the filtering operation; any operation known to those skilled in the art can be used.

[0033] The present invention also provides the application of the scratch-off water-based ink described in the above technical solution or the scratch-off water-based ink prepared by the preparation method described in the above technical solution in gravure printing.

[0034] The present invention does not impose any special limitations on the operation of the scratchable water-based ink in gravure printing; any operation known to those skilled in the art can be used.

[0035] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0036] The manufacturers of the raw materials used in the examples and comparative examples are as follows: The waterborne polyurethane emulsion is AH1604A from Anhui Anda Huatai New Materials Co., Ltd. The waterborne alcohol ester emulsion is Guangshu Chemical Technology Co., Ltd.'s waterborne acrylic modified alkyd resin GS-601. The defoamer is Tego Foamex 1488; The leveling agent is BYK-333; The colorant is a black colorant from Handan Tengke Chemical Distribution Co., Ltd.

[0037] Example 1 A water-based ink comprises, by weight percentage: 35.9% water-based emulsion, 30% color paste, 0.1% defoamer, 3% leveling agent, 1% dispersant, and 30% deionized water; The aqueous emulsion is an aqueous polyurethane emulsion and an aqueous alcohol ester emulsion; The mass ratio of the aqueous polyurethane emulsion to the aqueous alcohol ester emulsion is 1:1; The dispersant is BYK-163 and sodium lignosulfonate.

[0038] The mass ratio of BYK-163 to sodium lignosulfonate is 1:2; The preparation method of the water-based ink is as follows: Aqueous emulsion, color paste, defoamer, leveling agent, dispersant and deionized water are mixed and then passed through a 200-mesh sieve to obtain water-based ink.

[0039] Comparative Example 1 The aqueous polyurethane emulsion was omitted from Example 1, while other conditions remained unchanged.

[0040] Comparative Example 2 The aqueous alcohol ester emulsion was omitted from Example 1, while other conditions remained unchanged.

[0041] Comparative Example 3 Based on Example 1, the mass ratio of waterborne polyurethane emulsion and waterborne alcohol ester emulsion was changed to 1:2, while other conditions remained unchanged.

[0042] Comparative Example 4 Based on Example 1, the mass ratio of waterborne polyurethane emulsion and waterborne alcohol ester emulsion was changed to 4:1, while other conditions remained unchanged.

[0043] Example 2 Based on Example 1, the mass ratio of waterborne polyurethane emulsion and waterborne alcohol ester emulsion was changed to 2:1, while other conditions remained unchanged.

[0044] Example 3 Based on Example 1, the mass ratio of waterborne polyurethane emulsion to waterborne alcohol ester emulsion was changed to 3:1, while other conditions remained unchanged.

[0045] Comparative Example 5 Based on Example 1, the dispersant was changed to BYK-163, while other conditions remained unchanged.

[0046] Comparative Example 6 Based on Example 1, the dispersant was changed to sodium lignosulfonate, while other conditions remained unchanged.

[0047] Comparative Example 7 Based on Example 1, the mass ratio of BYK-163 and sodium lignosulfonate was changed to 1:1, while other conditions remained unchanged.

[0048] Comparative Example 8 Based on Example 1, the mass ratio of BYK-163 and sodium lignosulfonate was changed to 1:6, while other conditions remained unchanged.

[0049] Example 4 Based on Example 1, the mass ratio of BYK-163 and sodium lignosulfonate was changed to 1:3, while other conditions remained unchanged.

[0050] Example 5 Based on Example 1, the mass ratio of BYK-163 and sodium lignosulfonate was changed to 1:5, while other conditions remained unchanged.

[0051] Example 6 A water-based ink, by weight percentage, comprises the following components: 50% water-based emulsion, 25% color paste, 1% defoamer, 0.1% leveling agent, 3% dispersant, and 20.9% deionized water, with the other components being the same as in Example 1.

[0052] Example 7 A water-based ink, by weight percentage, comprises the following components: 40% water-based emulsion, 28% color paste, 0.5% defoamer, 2% leveling agent, 2% dispersant, and 27.5% deionized water, with the other components being the same as in Example 1.

[0053] The basic properties of the water-based inks in Examples 1-7 were tested. Appearance was directly observed, and fineness was tested using the GB / T13217.3-2008 method. The results are shown in Table 1. Table 1. Basic properties of the water-based inks in Examples 1-7

[0054] As can be seen from Table 1, the water-based ink provided by the present invention is black and the particle size meets the requirements for use.

[0055] The water-based inks prepared in Examples 1-7 and Comparative Examples 1-8 were printed on the surface of a polytetrafluoroethylene (PTFE) plate using a 250-mesh screen. The inks were left to dry and cure at room temperature, and then a scratch-off performance test was performed. (1) Scratch performance: Under indoor ambient temperature, with a load weight of 100g, the safety coating of the ticket sample can be scratched off in one go using a pencil scratch hardness tester; (2) Aging test of the scratch area: that is, after placing it in a drying oven at 95℃ for 24 hours, the safety coating can be scratched off in one go using a pencil scratch hardness tester with a load weight of ≤500g. The result is shown in Table 2.

[0056] Table 2. Scratching performance of water-based inks in Examples 1-7 and Comparative Examples 1-8

[0057] The water-based inks in Examples 1-7 of Table 2 can be scraped open and the ink layer rolls up, and can be crushed without getting your hands dirty.

[0058] As can be seen from Table 2, omitting either the waterborne polyurethane emulsion or the waterborne alcohol ester emulsion in the waterborne emulsion will reduce the scratch-off performance of the waterborne ink, indicating that the two can synergistically improve the scratch-off performance; using only BYK-163 or sodium lignosulfonate as dispersant will also affect the scratch-off performance, indicating that BYK-163 and sodium lignosulfonate can synergistically improve the scratch-off performance.

[0059] As can be seen from the above embodiments and comparative examples, the water-based ink provided by the present invention has excellent scratch-off performance.

[0060] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A scratch-off water-based ink, characterized in that, By weight percentage, it comprises the following components: 30-50% aqueous emulsion, 25-30% color paste, 0.1-1% defoamer, 0.1-3% leveling agent, 1-3% dispersant, and 15-30% water; The aqueous emulsion includes aqueous polyurethane emulsion and aqueous alcohol ester emulsion; The mass ratio of the aqueous polyurethane emulsion to the aqueous alcohol ester emulsion is (1~3):

1.

2. The scratchable water-based ink according to claim 1, characterized in that, By weight percentage, it comprises the following components: 34-45% aqueous emulsion, 26-28% color paste, 0.2-0.8% defoamer, 0.5-2.5% leveling agent, 1.5-2.5% dispersant, and 20-25% water.

3. The scratchable water-based ink according to claim 1 or 2, characterized in that, The mass ratio of the aqueous polyurethane emulsion to the aqueous alcohol ester emulsion is 2:

1.

4. The scratchable water-based ink according to claim 1 or 2, characterized in that, The colorant includes white or black colorant.

5. The scratchable water-based ink according to claim 1 or 2, characterized in that, The defoamer includes silicone defoamers.

6. The scratchable water-based ink according to claim 1 or 2, characterized in that, The dispersant includes BYK-163 and sodium lignosulfonate.

7. The scratchable water-based ink according to claim 6, characterized in that, The mass ratio of BYK-163 to sodium lignosulfonate is 1:(2~5).

8. The scratchable water-based ink according to claim 1 or 2, characterized in that, The fineness of the scrapable water-based ink is ≤10μm.

9. The method for preparing the scratch-off water-based ink according to any one of claims 1 to 8, characterized in that, include: A water-based emulsion, color paste, defoamer, leveling agent, dispersant and water are mixed to obtain a scrapable water-based ink.

10. The application of the scratch-off water-based ink according to any one of claims 1 to 8 or the scratch-off water-based ink prepared by the preparation method according to claim 9 in gravure printing.

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