A high-gloss, wear-resistant screen printing ink

Abstract

This invention belongs to the field of coating technology, specifically relating to a high-gloss, abrasion-resistant screen printing ink. By weight, the high-gloss, abrasion-resistant screen printing ink comprises the following components: 10-20 parts modified acrylate; 30-60 parts self-made acrylic resin; 20-40 parts reactive monomer; 2-5 parts carbon black; 10-15 parts filler; 4-8 parts photoinitiator; 0.2-0.6 parts leveling agent; 0.5-1.5 parts dispersant; and 0.1-0.5 parts defoamer. The high-gloss, abrasion-resistant screen printing ink provided by this invention, by introducing a self-made acrylic resin rich in hydroxyl groups, benzoquinone side chains, and benzene ring structures, can effectively improve the wettability of pigments with nanoscale dimensions and large specific surface areas, helping the pigments to be more uniformly dispersed in the ink matrix, thereby enhancing the gloss and color vibrancy of the ink layer; simultaneously, it can further improve the hardness and abrasion resistance of the cured ink coating.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a high-gloss, wear-resistant screen printing ink. Background Technology

[0002] Screen printing inks have a wide range of applications, commonly used in food packaging, fabric pattern printing, and other fields. Most traditional screen printing inks are solvent-based, which is not environmentally friendly. Some are made with water-based coatings, which are relatively environmentally friendly, but their efficiency is low and their performance is not ideal. UV coatings are also available for screen printing inks, which are green and environmentally friendly, but still suffer from low gloss. To solve this problem, an additional layer of varnish is usually required, making the process cumbersome. Summary of the Invention

[0003] The technical problem to be solved by this invention is: to address the issue of poor color in existing UV screen printing inks, this invention provides a high-gloss and wear-resistant screen printing ink. This ink, through the self-made acrylic resin, simultaneously introduces a large number of hydroxyl-containing, benzoquinone side chains, and benzene ring structures, which helps to improve the wettability of pigments with nano-sized dimensions and large specific surface areas, thereby enhancing the color brightness of the cured ink coating. This solves the problem of poor color in existing UV screen printing inks and expands the application range of screen printing inks.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A high-gloss, wear-resistant screen printing ink, comprising the following components by weight:

[0006]

[0007]

[0008] The self-made acrylic resin contains hydroxyl groups, benzoquinone side chains, and benzene ring structures.

[0009] Optionally, the homemade acrylic resin is prepared by the following method:

[0010] S1: Mix 4-acryloylmorpholine, butyl methacrylate, styrene, 2-allyloxy-1,4-benzoquinone, azobisisobutyronitrile and dioxane to obtain a reaction mixture;

[0011] S2: The reaction mixture is subjected to deoxygenation, stirring, and vacuum distillation in sequence to obtain a solid product;

[0012] S3: After washing the solid product, vacuum dry overnight to obtain the self-made acrylic resin.

[0013] Optionally, in step S1, the molar ratio of 4-acryloylmorpholine, butyl methacrylate, styrene, and 2-allyloxy-1,4-benzoquinone is (1-2):1:4:(3-4), the amount of azobisisobutyronitrile added is (0.5-1)% of the total weight of the monomers, and the mass ratio of butyl methacrylate to dioxane is 1:(5-10).

[0014] Optionally, the modified acrylate is selected from at least one of polyester modified acrylate, epoxy modified acrylate and polyurethane modified acrylate.

[0015] Optionally, the photoinitiator is selected from at least one of 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyldiphenoxyphosphine, and 4-chlorobenzophenone.

[0016] Optionally, the active monomer is selected from at least one of HDDA, DPHA, and IBOA.

[0017] Optionally, the carbon black is high-pigment carbon black; the filler is talc.

[0018] Optionally, the leveling agent is an organosilicon leveling agent.

[0019] Optionally, the defoamer is an organosilicone defoamer.

[0020] Optionally, the dispersant is a macromolecular dispersant.

[0021] The present invention has the following beneficial effects:

[0022] The high-gloss and wear-resistant screen printing ink provided by this invention, by introducing a self-made acrylic resin rich in hydroxyl groups, benzoquinone side chains and benzene ring structures, can effectively improve the wettability of pigments with nano-sized and large specific surface areas, which helps the pigments to be more uniformly dispersed in the ink matrix, thereby improving the gloss and color brightness of the ink curing coating; at the same time, it can also further improve the hardness and wear resistance of the ink curing coating. Detailed Implementation

[0023] The present invention will now be described in further detail. The embodiments described below are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] Existing UV screen printing inks, while environmentally friendly, suffer from poor pigment wetting and encapsulation due to the small molecular weight of the resin, resulting in less vibrant and saturated colors. To address the issue of poor color in existing UV screen printing inks, this invention provides a high-gloss, abrasion-resistant screen printing ink, comprising the following components by weight:

[0025]

[0026]

[0027] The self-made acrylic resin contains hydroxyl groups, benzoquinone side chains, and benzene ring structures.

[0028] The high-gloss and wear-resistant screen printing ink provided by this invention, by introducing a self-made acrylic resin rich in hydroxyl groups, benzoquinone side chains, and benzene ring structures, can effectively improve the wettability of pigments with nano-sized and large specific surface areas, especially the wettability of high-pigment carbon black. This helps the pigment to be more uniformly dispersed in the ink matrix, thereby improving the gloss and color brightness of the ink-cured coating. It eliminates the need for additional varnish during use, thus reducing operation steps and simplifying the process while ensuring that it meets the usage requirements. At the same time, it can also further improve the hardness and wear resistance of the ink-cured coating.

[0029] The modified acrylates used in this invention can be purchased directly; preferably, the modified acrylates are selected from at least one of polyester modified acrylates, epoxy modified acrylates, and polyurethane modified acrylates; further, the polyester modified acrylate is preferably a trifunctional polyester modified acrylate with a viscosity of 6500-7500 (cps, at 25℃), and specifically preferably a Changxing 6340N; the epoxy modified acrylate has a viscosity of 30000-35000 (cps, at 25℃), and specifically preferably a Changxing 6210G; the polyurethane modified acrylate is preferably an aliphatic polyurethane acrylate with a viscosity of 8000-12000 (cps, at 60℃), and specifically preferably a Changxing 6113.

[0030] To ensure the gloss and abrasion resistance of screen printing inks, this invention preferably uses a self-made acrylic resin prepared by the following method:

[0031] S1: Mix 4-acryloylmorpholine (ACMO), butyl methacrylate (BMA), styrene, 2-allyloxy-1,4-benzoquinone, azobisisobutyronitrile and dioxane to obtain a reaction mixture;

[0032] S2: The reaction mixture is deoxygenated, then stirred at 70°C and distilled under reduced pressure to obtain a solid product;

[0033] S3: After washing the solid product with n-hexane, it was vacuum dried overnight at 45°C to obtain the self-made acrylic resin.

[0034] In the preferred step S1 of this invention, the molar ratio of 4-acryloylmorpholine (ACMO), butyl methacrylate (BMA), styrene, and 2-allyloxy-1,4-benzoquinone is (1-2):1:4:(3-4), the amount of azobisisobutyronitrile added is (0.5-1)% of the total weight of the monomers, and the mass ratio of butyl methacrylate to dioxane is 1:(5-10).

[0035] The preferred photoinitiator is selected from at least one of 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyldiphenoxyphosphine, and 4-chlorobenzophenone.

[0036] The preferred active monomer is selected from at least one of HDDA, DPHA, and IBOA.

[0037] The preferred carbon black is high-pigment carbon black, and more preferably, Columbia 5000 high-pigment carbon black; the preferred filler is talc, and more preferably, Foshan Bozhen 5000 mesh talc.

[0038] The preferred leveling agent is a silicone leveling agent, and specifically, the preferred silicone leveling agent is DIG 450; the preferred defoamer is a silicone defoamer, and specifically, the preferred silicone defoamer is DIG 920.

[0039] The preferred dispersant is a macromolecular dispersant, and specifically, BYK168 is preferred.

[0040] The present invention preferably describes a method for preparing high-gloss and abrasion-resistant screen printing ink as described above, comprising the following steps: mixing the raw materials, stirring at 40-50°C for 30-40 minutes, cooling to room temperature, and then grinding to obtain the high-gloss and abrasion-resistant screen printing ink.

[0041] The present invention provides a simple method for preparing high-gloss and wear-resistant screen printing ink. By introducing a self-made acrylic resin rich in hydroxyl groups, benzoquinone side chains, and benzene ring structures, the wettability of pigments with nanoscale size and large specific surface area can be effectively improved, which helps the pigments to be more uniformly dispersed in the ink matrix. This results in screen printing inks with good gloss, wear resistance, and color vibrancy. The method is suitable for mass production and can meet the needs of industrial production.

[0042] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below.

[0043] Unless otherwise specified, the self-made acrylic resins used in the embodiments and comparative examples of this invention are prepared according to the following method:

[0044] S1: Weigh 4-acryloylmorpholine (ACMO), butyl methacrylate (BMA), styrene, 2-allyloxy-1,4-benzoquinone, azobisisobutyronitrile, and dioxane into a round-bottom flask to obtain a reaction mixture; the molar ratio of ACMO, BMA, styrene, and 2-allyloxy-1,4-benzoquinone is 2:1:4:4, the amount of azobisisobutyronitrile added is 0.5% of the total weight of the monomers, and the mass ratio of BMA to dioxane is 1:8;

[0045] S2: The reaction mixture was purged with nitrogen for 50 min to remove oxygen, then stirred at 70 °C and distilled under reduced pressure to obtain a solid product;

[0046] S3: After washing the solid product with n-hexane, it was vacuum dried overnight at 45°C to obtain the self-made acrylic resin.

[0047] The screen printing inks in the embodiments and comparative examples of the present invention are prepared by the following method: the raw materials are mixed, stirred at 50°C for 30 minutes, cooled to room temperature and then ground to obtain high gloss and wear-resistant screen printing ink.

[0048] In all embodiments and comparative examples of this invention, the polyester-modified acrylate was Changxing 6340N; the epoxy-modified acrylate was Changxing 6210G; the polyurethane-modified acrylate was Changxing 6113; the high-pigment carbon black was Columbia 5000; the filler was Foshan Bozhen 5000 mesh talc powder; the leveling agent was Digo 450; the dispersant was BYK168; and the defoamer was Digo 920.

[0049] Example 1

[0050] This embodiment provides a high-gloss, wear-resistant screen printing ink, which comprises the following components by weight:

[0051]

[0052] Example 2

[0053] This embodiment provides a high-gloss, wear-resistant screen printing ink, which comprises the following components by weight:

[0054]

[0055] Example 3

[0056] This embodiment provides a high-gloss, wear-resistant screen printing ink, which comprises the following components by weight:

[0057]

[0058] Example 4

[0059] This embodiment provides a high-gloss, wear-resistant screen printing ink, which comprises the following components by weight:

[0060]

[0061]

[0062] Example 5

[0063] This embodiment provides a high-gloss, wear-resistant screen printing ink, which comprises the following components by weight:

[0064]

[0065] Example 6

[0066] This embodiment provides a high-gloss, wear-resistant screen printing ink, which comprises the following components by weight:

[0067]

[0068]

[0069] Comparative Example 1

[0070] This comparative example provides a high-gloss, abrasion-resistant screen printing ink, which comprises the following components by weight:

[0071]

[0072] The commercially available styrene-acrylic resin is Indurez SR-10 (Xiamen Aikema Chemical Co., Ltd.).

[0073] Comparative Example 2

[0074] This comparative example provides a high-gloss, abrasion-resistant screen printing ink, which comprises the following components by weight:

[0075]

[0076] The commercially available polyether acrylate is Sartoma CN550.

[0077] Comparative Example 3

[0078] This comparative example provides a high-gloss, abrasion-resistant screen printing ink, which comprises the following components by weight:

[0079]

[0080]

[0081] In this comparative example, the self-made modified acrylic resin was prepared according to the following method:

[0082] S1: Weigh butyl methacrylate (BMA), styrene, 2-allyloxy-1,4-benzoquinone, azobisisobutyronitrile and dioxane into a round-bottom flask to obtain a reaction mixture; the molar ratio of BMA, styrene and 2-allyloxy-1,4-benzoquinone is 1:4:4, the amount of azobisisobutyronitrile added is 0.5% of the total weight of the monomers, and the mass ratio of BMA to dioxane is 1:8;

[0083] S2: The reaction mixture was purged with nitrogen for 50 min to remove oxygen, then stirred at 70 °C and distilled under reduced pressure to obtain a solid product;

[0084] S3: After washing the solid product with n-hexane, it was vacuum dried overnight at 45°C to obtain the self-made modified acrylic resin.

[0085] Comparative Example 4

[0086] This comparative example provides a high-gloss, abrasion-resistant screen printing ink, which comprises the following components by weight:

[0087]

[0088]

[0089] In this comparative example, the self-made modified acrylic resin II was prepared according to the following method:

[0090] S1: Weigh 4-acryloylmorpholine (ACMO), butyl methacrylate (BMA), styrene, azobisisobutyronitrile (AIBN), and dioxane into a round-bottom flask to obtain a reaction mixture; the molar ratio of ACMO, BMA, and styrene is 2:1:4, the amount of AIBN added is 0.5% of the total weight of the monomers, and the mass ratio of BMA to dioxane is 1:8;

[0091] S2: The reaction mixture was purged with nitrogen for 50 min to remove oxygen, then stirred at 70 °C and distilled under reduced pressure to obtain a solid product;

[0092] S3: After washing the solid product with n-hexane, it was vacuum dried overnight at 45°C to obtain the self-made modified acrylic resin II.

[0093] Comparative Example 5

[0094] This comparative example provides a high-gloss, abrasion-resistant screen printing ink, which comprises the following components by weight:

[0095]

[0096] In this comparative example, the self-made modified acrylic resin was prepared according to the following method:

[0097] S1: Weigh 4-acryloylmorpholine (ACMO), butyl methacrylate (BMA), styrene, 2-allyloxy-1,4-benzoquinone, azobisisobutyronitrile, and dioxane into a round-bottom flask to obtain a reaction mixture; the molar ratio of ACMO, BMA, styrene, and 2-allyloxy-1,4-benzoquinone is 4:1:4:5, the amount of azobisisobutyronitrile added is 0.5% of the total weight of the monomers, and the mass ratio of BMA to dioxane is 1:8;

[0098] S2: The reaction mixture was purged with nitrogen for 50 min to remove oxygen, then stirred at 70 °C and distilled under reduced pressure to obtain a solid product;

[0099] S3: After washing the solid product with n-hexane, it was vacuum dried overnight at 45°C to obtain the self-made modified acrylic resin III.

[0100] Comparative Example 6

[0101] This comparative example provides a high-gloss, abrasion-resistant screen printing ink, which comprises the following components by weight:

[0102]

[0103] Comparative Example 7

[0104] This comparative example provides a high-gloss, abrasion-resistant screen printing ink, which comprises the following components by weight:

[0105]

[0106] The screen printing inks provided in the above embodiments and comparative examples were subjected to performance tests. The test methods are as follows: Adhesion: The adhesion of the ink coating was determined according to the method of GB / T9286-1998.

[0107] Abrasion resistance: According to BSEN16094-2012, Martindale test was used, and the abrasion resistance was B1 > B2 > B3.

[0108] Hardness: Tested according to standard GB / T6739-2006;

[0109] Gloss level: tested using a 60° angle gloss meter;

[0110] Color: Observed by the naked eye.

[0111] The test data for each embodiment and comparative example are shown in Table 1:

[0112] Table 1

[0113] Test Items Adhesion hardness Abrasion resistance (ring) Glossiness (°) color Example 1 0 2H B1 94 bright Example 2 0 3H B1 97 bright Example 3 0 2H B1 95 bright Example 4 0 2H B1 96 bright Example 5 0 2H B1 93 bright Example 6 0 H B1 92 bright Comparative Example 1 0 2H B2 78 Enlightenment Comparative Example 2 1 H B3 83 brighter Comparative Example 3 1 HB B2 76 A little confused Comparative Example 4 0 2H B2 88 Enlightenment Comparative Example 5 1 H B2 89 A little confused Comparative Example 6 0 B B2 73 A little confused Comparative Example 7 0 HB B3 89 bright

[0114] As can be seen from the above data, the screen printing inks prepared according to the present invention in Examples 1-6 all have good gloss, abrasion resistance and color brightness, which helps to expand the application field of the screen printing ink and make it more widely applicable in the market.

[0115] The difference between Comparative Example 1 and Example 1 is that the self-made acrylic resin in Example 1 was replaced with commercially available styrene acrylic resin. The screen printing ink prepared in this way has poor abrasion resistance, low gloss, and dull color.

[0116] The difference between Comparative Example 2 and Example 1 is that the modified acrylate in Example 1 was replaced with commercially available polyether acrylate. The screen printing ink prepared in Comparative Example 2 has lower hardness, poor abrasion resistance, and reduced gloss.

[0117] The difference between Comparative Example 3 and Example 1 is that ACMO was removed during the preparation of the self-made acrylic resin, resulting in screen printing ink with lower hardness, poor abrasion resistance, low gloss, and dull color.

[0118] The difference between Comparative Example 4 and Example 1 is that 2-allyloxy-1,4-benzoquinone was removed during the preparation of the self-made acrylic resin, resulting in screen printing ink with poor abrasion resistance and a hazy color.

[0119] The difference between Comparative Example 5 and Example 1 is that, in the preparation of the self-made acrylic resin, the molar ratio of ACMO, BMA, styrene, and 2-allyloxy-1,4-benzoquinone was changed to 4:1:4:5. The screen printing ink prepared in this way had a more hazy color, lower hardness, and poorer abrasion resistance.

[0120] The difference between Comparative Example 6 and Example 1 is that the amount of self-made acrylic resin added was reduced, resulting in screen printing ink with a dull color, reduced hardness, and decreased gloss.

[0121] The difference between Comparative Example 7 and Example 1 is that the amount of self-made acrylic resin added was increased. The color brightness of the prepared screen printing ink was not significantly different, but the hardness, abrasion resistance and gloss were reduced.

[0122] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-gloss, wear-resistant screen printing ink, characterized in that, Based on parts by weight, it includes the following components: 10-20 parts of modified acrylate; Homemade acrylic resin, 30-60 parts; 20-40 parts of active monomer; 2-5 parts carbon black; 10-15 parts of filler; 4-8 parts of photoinitiator; Leveling agent 0.2-0.6 parts; Dispersant 0.5-1.5 parts; 0.1-0.5 parts of defoamer; The self-made acrylic resin contains hydroxyl groups, benzoquinone side chains, and benzene ring structures simultaneously. The self-made acrylic resin is composed of ACMO, BMA, styrene, and 2-allyloxy-1,4-benzoquinone, and the molar ratio of 4-acryloylmorpholine, butyl methacrylate, styrene, and 2-allyloxy-1,4-benzoquinone is (1-2):1:4:(3-4). The modified acrylate is selected from at least one of polyester modified acrylate, epoxy modified acrylate, and polyurethane modified acrylate.

2. The high-gloss, wear-resistant screen printing ink as described in claim 1, characterized in that, The self-made acrylic resin was prepared by the following method: S1: Mix 4-acryloylmorpholine, butyl methacrylate, styrene, 2-allyloxy-1,4-benzoquinone, azobisisobutyronitrile and dioxane to obtain a reaction mixture; S2: The reaction mixture is subjected to deoxygenation, stirring, and vacuum distillation in sequence to obtain a solid product; S3: After washing the solid product, vacuum dry it to obtain the self-made acrylic resin.

3. The high-gloss, wear-resistant screen printing ink as described in claim 2, characterized in that, In step S1, the amount of azobisisobutyronitrile added is (0.5-1)% of the total weight of the monomers, and the mass ratio of butyl methacrylate to dioxane is 1:(5-10).

4. A high-gloss, wear-resistant screen printing ink as described in any one of claims 1-3, characterized in that, The photoinitiator is selected from at least one of 1-hydroxycyclohexylphenyl ketone, 2,4,6-trimethylbenzoyldiphenyloxyphosphine, and 4-chlorobenzophenone.

5. A high-gloss, wear-resistant screen printing ink as described in any one of claims 1-3, characterized in that, The active monomer is selected from at least one of HDDA, DPHA, and IBOA.

6. A high-gloss, wear-resistant screen printing ink as described in any one of claims 1-3, characterized in that, The carbon black is high-pigment carbon black; the filler is talc.

7. A high-gloss, wear-resistant screen printing ink as described in any one of claims 1-3, characterized in that, The leveling agent is an organosilicon-based leveling agent.

8. A high-gloss, wear-resistant screen printing ink as described in any one of claims 1-3, characterized in that, The defoamer is an organosilicone defoamer.

9. A high-gloss, wear-resistant screen printing ink as described in any one of claims 1-3, characterized in that, The dispersant is a macromolecular dispersant.

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