A dual-purpose high-adhesion composite offset printing ink and its preparation method

Abstract

This invention relates to a dual-purpose high-adhesion composite offset printing ink and its preparation method, belonging to the field of offset printing technology. The invention provides a method for preparing a dual-purpose high-adhesion composite offset printing ink, the steps of which include: melting rosin and mixing it with maleic anhydride and phthalic anhydride; cooling the mixture and then adding pentaerythritol and glycerol; continuing to mix and cooling to obtain a rosin-modified resin; adding an acrylate copolymer and epoxidized soybean oil; then adding a dual-modified pigment, manganese isooctanoate, and a dispersant; continuing to mix and grinding to obtain a premix; mixing this premix with KH-570; then adding a photoinitiator and an antioxidant; continuing to mix and filtering to obtain the final product. This invention achieves synergy between UV curing and oxidative curing by adjusting the formulation, while introducing dual-modified pigments and acrylate copolymers to achieve interfacial bonding between the ink and the cured layer, as well as the UV-cured layer or the oxidative cured layer, avoiding delamination and promoting high ink adhesion.

Description

Technical Field

[0001] This invention belongs to the field of offset printing technology and relates to a dual-purpose high-adhesion composite offset printing ink and its preparation method. Background Technology

[0002] Offset printing ink is a special type of ink used in offset printing, with a wide range of applications including newspapers, magazines, books, and various other printed materials. Currently, offset printing inks are typically either single-stage UV-curing or single-stage natural oxidation. While UV-curing inks can achieve instant drying, they require high-energy equipment and have poor adhesion to non-polar substrates. Natural oxidation inks, while environmentally friendly, have slow drying speeds, failing to meet the demands of high-efficiency production. To combine the advantages of both, it is necessary to develop dual-purpose offset printing inks. However, the drying speed slows down when converting UV-curing inks to natural oxidation inks, and the conversion of natural oxidation inks to UV-curing inks may result in incomplete curing or decreased adhesion due to insufficient reactivity. These issues need to be addressed. Summary of the Invention

[0003] The purpose of this invention is to provide a dual-purpose high-adhesion composite offset printing ink and its preparation method. This invention achieves synergy between UV curing and oxidative curing by adjusting the formula, and introduces dual-modified pigments, acrylate copolymers, etc. to achieve interfacial bonding between the ink and the cured layer, as well as the UV-cured layer or the oxidative cured layer, thereby avoiding delamination and promoting high ink adhesion.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A method for preparing a dual-purpose, high-adhesion composite offset printing ink, the method comprising the following steps:

[0006] Step 1: Melt rosin and mix it with maleic anhydride and phthalic anhydride. After cooling, add pentaerythritol and glycerol, continue mixing, and cool to obtain rosin-modified resin.

[0007] Step 2: Mix rosin-modified resin, acrylate copolymer, and epoxidized soybean oil, then add dual-modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind until the fineness is ≤5μm to obtain a premix.

[0008] Step 3: Mix the premix and KH-570, then add the photoinitiator and antioxidant, continue mixing, and filter to obtain the final product.

[0009] Further, the raw materials of the composite offset printing ink, by weight, are: 50-70 parts rosin, 15-25 parts maleic anhydride, 5-10 parts phthalic anhydride, 10-20 parts pentaerythritol, 5-10 parts glycerol, 1-5 parts acrylate copolymer, 0.5-2.7 parts epoxidized soybean oil, 1.3-6.7 parts dual-modified pigment, 0.1-3 parts manganese isooctanoate, 0.1-0.5 parts dispersant, 0.2-1 part KH-570, 0.3-0.6 parts photoinitiator, and 0.07-0.15 parts antioxidant.

[0010] Further, the mixing in step one refers to stirring at 200-300 rpm for 2-3 hours at 185-195℃; the cooling refers to cooling to 115-125℃; and the continued mixing refers to stirring at 250-350 rpm for 2.5-3.5 hours.

[0011] Furthermore, the preparation method of the dual-modified pigment described in step two includes the following steps:

[0012] Step A1: Mix KH-570 with anhydrous ethanol, then add pigment, continue mixing, and vacuum dry to obtain the initial product;

[0013] Step A2: Mix the primary product with the terminal hydroxyl hyperbranched polyester, cool and pass through a 100-mesh sieve to obtain the final product.

[0014] Furthermore, the raw materials for the dual-modified pigment, by weight, include 9.6-10.2 parts pigment, 0.4-0.8 parts KH-570, 0.12-0.18 parts hydroxyl-terminated hyperbranched polyester, and 20-24 parts anhydrous ethanol; the pigment includes carbon black and phthalocyanine blue.

[0015] Further, the mixing in step A1 refers to setting the ultrasonic frequency to 40-50kHz, the ultrasonic power to 250-350W, and ultrasonication for 10-20 minutes; the continued mixing refers to increasing the ultrasonic power to 450-550W and ultrasonication for 30-40 minutes; the vacuum drying temperature is 80℃.

[0016] Further, the mixing mentioned in step A2 refers to stirring at 800-1200 rpm at 60°C for 1-1.2 hours.

[0017] Furthermore, all KH-570s require pretreatment. Specifically, KH-570, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:2.8-3.2:1, and 0.1-0.2 mol / L acetic acid is added dropwise to adjust the pH to 4.8-5.2. The mixture is then stirred at 100-200 rpm for 1-1.4 hours at 50°C to obtain the final product.

[0018] Further, the mixing in step two refers to stirring at 450-550 rpm for 40-50 minutes in a 60°C water bath; the continued mixing refers to stirring at 2000-3000 rpm for 1-2 hours.

[0019] Furthermore, the mixing mentioned in step three refers to stirring at 250-350 rpm for 20-30 minutes at 40°C; the continued mixing refers to stirring at 180-220 rpm for 8-12 minutes.

[0020] The beneficial effects of this invention are:

[0021] (1) The present invention introduces a photoinitiator into the formulation. The acrylate copolymer achieves rapid curing under UV irradiation under the action of the photoinitiator. The rosin resin is modified and manganese isooctanoate accelerates the oxidative crosslinking of unsaturated double bonds in rosin acid and maleic anhydride, making the ink suitable for different printing scenarios.

[0022] (2) Based on the two curing methods, this invention introduces epoxidized soybean oil, in which the epoxy groups may play an auxiliary cross-linking role and participate in the co-construction of the cross-linking network; in addition, the acrylate copolymer contains flexible chain ends, which can reduce the interface peeling caused by curing shrinkage, and synergistically achieve the interface bonding between the ink and the cured layer, avoid delamination, and promote high adhesion of the ink.

[0023] (3) The present invention introduces a dual-modified pigment into the formulation. The pretreated KH-570 is modified on the surface of the pigment to give the pigment more active sites, and then forms a chemical connection with the active groups of the resin matrix, such as epoxy groups. On this basis, the hydroxyl groups of the hyperbranched polyester and the organic functional groups of KH-570, such as methacryloyloxy groups, are combined through van der Waals forces to finally form a dual modification. The organic segments of KH-570 have similar polarity to the resin matrix, while the three-dimensional structure of the hyperbranched polyester fills the micropores at the resin-pigment interface, reducing stress concentration. Its polyhydroxy structure forms a hydrogen bond network with the resin, further improving the interfacial bonding strength and giving the ink high adhesion performance. Detailed Implementation

[0024] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0025] In all embodiments and comparative examples of this invention, glycerol, epoxidized soybean oil, BYK-163, KH-570 (E51), TPO, and BHT were obtained directly from the market and were purchased from Jining Tangyi Chemical Co., Ltd.; maleic anhydride was obtained directly from the market and was purchased from Jinan Aoxing Chemical Co., Ltd.; phthalic anhydride was obtained directly from the market and was purchased from Shandong Jinhe Chemical Co., Ltd.; pentaerythritol was obtained directly from the market and was purchased from Foshan Yincheng Chemical Co., Ltd.; the acrylate copolymer, specifically acrylate-hydroxypropyl acrylate copolymer, was obtained directly from the market and was purchased from Hubei Dali Chemical Co., Ltd.; carbon black was obtained directly from the market and was purchased from Tianjin Jifa Pigment Co., Ltd.; anhydrous ethanol and acetic acid were obtained directly from the market and were purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd.; hydroxyl-terminated hyperbranched polyester was obtained directly from the market and was purchased from Guangdong Fangxin Biotechnology Co., Ltd.; and manganese isooctanoate was obtained directly from the market and was purchased from Shandong Xinghai Chemical Co., Ltd.

[0026] Example 1

[0027] A method for preparing a dual-purpose, high-adhesion composite offset printing ink, the method comprising the following steps:

[0028] Step 1: Melt rosin and mix it with maleic anhydride and phthalic anhydride. After cooling, add pentaerythritol and glycerol, continue mixing, and cool to obtain rosin-modified resin.

[0029] Step 2: Mix rosin-modified resin, acrylate copolymer, and epoxidized soybean oil, then add dual-modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind until the fineness is ≤5μm to obtain a premix.

[0030] Step 3: Mix the premix and KH-570, then add the photoinitiator and antioxidant, continue mixing, and filter to obtain the final product.

[0031] The raw materials of the composite offset printing ink, by weight, are: 50 parts rosin, 15 parts maleic anhydride, 5 parts phthalic anhydride, 10 parts pentaerythritol, 5 parts glycerol, 1 part acrylate copolymer, 0.5 parts epoxidized soybean oil, 1.3 parts dual-modified pigment, 0.1 parts manganese isooctanoate, 0.1 parts dispersant, 0.2 parts KH-570, 0.3 parts photoinitiator, and 0.07 parts antioxidant; the dispersant is BYK-163; the photoinitiator is TPO; and the antioxidant is BHT.

[0032] The mixing in step one refers to stirring at 200 rpm for 2 hours at 185°C; the cooling refers to cooling to 115°C; and the continued mixing refers to stirring at 250 rpm for 2.5 hours.

[0033] The preparation method of the dual-modified pigment described in step two includes the following steps:

[0034] Step A1: Mix KH-570 with anhydrous ethanol, then add pigment, continue mixing, and vacuum dry to obtain the initial product;

[0035] Step A2: Mix the primary product with the terminal hydroxyl hyperbranched polyester, cool and pass through a 100-mesh sieve to obtain the final product.

[0036] The raw materials of the dual-modified pigment, by weight, include 9.6 parts pigment, 0.4 parts KH-570, 0.12 parts hydroxyl-terminated hyperbranched polyester, and 20 parts anhydrous ethanol; the pigment is carbon black.

[0037] The mixing in step A1 refers to setting the ultrasonic frequency to 40kHz, the ultrasonic power to 250W, and ultrasonication for 10 minutes; the continued mixing refers to increasing the ultrasonic power to 450W and ultrasonication for 30 minutes; the vacuum drying temperature is 80℃.

[0038] The mixing mentioned in step A2 refers to stirring at 800 rpm for 1 hour at 60°C.

[0039] All KH-570s require pretreatment. Specifically, KH-570, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:2.8:1, and 0.1 mol / L acetic acid is added dropwise to adjust the pH to 4.8. The mixture is then stirred at 100 rpm for 1 hour at 50°C to obtain the final product.

[0040] The mixing in step two refers to stirring at 450 rpm for 40 minutes in a 60°C water bath; the continued mixing refers to stirring at 2000 rpm for 1 hour.

[0041] The mixing in step three refers to stirring at 250 rpm for 20 minutes at 40°C; the continued mixing refers to stirring at 180 rpm for 8 minutes.

[0042] Example 2

[0043] A method for preparing a dual-purpose, high-adhesion composite offset printing ink, the method comprising the following steps:

[0044] Step 1: Melt rosin and mix it with maleic anhydride and phthalic anhydride. After cooling, add pentaerythritol and glycerol, continue mixing, and cool to obtain rosin-modified resin.

[0045] Step 2: Mix rosin-modified resin, acrylate copolymer, and epoxidized soybean oil, then add dual-modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind until the fineness is ≤5μm to obtain a premix.

[0046] Step 3: Mix the premix and KH-570, then add the photoinitiator and antioxidant, continue mixing, and filter to obtain the final product.

[0047] The raw materials of the composite offset printing ink, by weight, are: 58 parts rosin, 17 parts maleic anhydride, 6 parts phthalic anhydride, 12 parts pentaerythritol, 6.9 parts glycerol, 2 parts acrylate copolymer, 1.1 parts epoxidized soybean oil, 3.2 parts dual-modified pigment, 1.12 parts manganese isooctanoate, 0.2 parts dispersant, 0.4 parts KH-570, 0.4 parts photoinitiator, and 0.08 parts antioxidant; the dispersant is BYK-163; the photoinitiator is TPO; and the antioxidant is BHT.

[0048] The mixing in step one refers to stirring at 220 rpm at 188°C for 2.3 hours; the cooling refers to cooling to 116°C; and the continued mixing refers to stirring at 280 rpm for 2.8 hours.

[0049] The preparation method of the dual-modified pigment described in step two includes the following steps:

[0050] Step A1: Mix KH-570 with anhydrous ethanol, then add pigment, continue mixing, and vacuum dry to obtain the initial product;

[0051] Step A2: Mix the primary product with the terminal hydroxyl hyperbranched polyester, cool and pass through a 100-mesh sieve to obtain the final product.

[0052] The raw materials of the dual-modified pigment, by weight, include 9.7 parts pigment, 0.5 parts KH-570, 0.14 parts hydroxyl-terminated hyperbranched polyester, and 21 parts anhydrous ethanol; the pigment is carbon black.

[0053] The mixing in step A1 refers to setting the ultrasonic frequency to 42kHz, the ultrasonic power to 270W, and ultrasonication for 13 minutes; the continued mixing refers to increasing the ultrasonic power to 480W and ultrasonication for 32 minutes; the vacuum drying temperature is 80℃.

[0054] The mixing mentioned in step A2 refers to stirring at 900 rpm for 1.06 h at 60°C.

[0055] All KH-570s require pretreatment. Specifically, KH-570, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:2.9:1, and 0.12 mol / L acetic acid is added dropwise to adjust the pH to 4.9. The mixture is then stirred at 120 rpm for 1.1 h at 50 °C to obtain the final product.

[0056] The mixing in step two refers to stirring at 460 rpm for 42 minutes in a 60°C water bath; the continued mixing refers to stirring at 2300 rpm for 1.4 hours.

[0057] The mixing in step three refers to stirring at 280 rpm for 23 minutes at 40°C; the continued mixing refers to stirring at 190 rpm for 9 minutes.

[0058] Example 3

[0059] A method for preparing a dual-purpose, high-adhesion composite offset printing ink, the method comprising the following steps:

[0060] Step 1: Melt rosin and mix it with maleic anhydride and phthalic anhydride. After cooling, add pentaerythritol and glycerol, continue mixing, and cool to obtain rosin-modified resin.

[0061] Step 2: Mix rosin-modified resin, acrylate copolymer, and epoxidized soybean oil, then add dual-modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind until the fineness is ≤5μm to obtain a premix.

[0062] Step 3: Mix the premix and KH-570, then add the photoinitiator and antioxidant, continue mixing, and filter to obtain the final product.

[0063] The raw materials of the composite offset printing ink, by weight, are: 60 parts rosin, 20 parts maleic anhydride, 7.5 parts phthalic anhydride, 15 parts pentaerythritol, 7.5 parts glycerol, 3 parts acrylate copolymer, 1.6 parts epoxidized soybean oil, 4 parts dual-modified pigment, 1.55 parts manganese isooctanoate, 0.3 parts dispersant, 0.6 parts KH-570, 0.45 parts photoinitiator, and 0.11 parts antioxidant; the dispersant is BYK-163; the photoinitiator is TPO; and the antioxidant is BHT.

[0064] The mixing in step one refers to stirring at 250 rpm at 190°C for 2.5 hours; the cooling refers to cooling to 120°C; and the continued mixing refers to stirring at 300 rpm for 3 hours.

[0065] The preparation method of the dual-modified pigment described in step two includes the following steps:

[0066] Step A1: Mix KH-570 with anhydrous ethanol, then add pigment, continue mixing, and vacuum dry to obtain the initial product;

[0067] Step A2: Mix the primary product with the terminal hydroxyl hyperbranched polyester, cool and pass through a 100-mesh sieve to obtain the final product.

[0068] The raw materials of the dual-modified pigment, by weight, include 9.9 parts pigment, 0.6 parts KH-570, 0.15 parts hydroxyl-terminated hyperbranched polyester, and 22 parts anhydrous ethanol; the pigment is carbon black.

[0069] The mixing in step A1 refers to setting the ultrasonic frequency to 45kHz, the ultrasonic power to 300W, and ultrasonication for 15 minutes; the continued mixing refers to increasing the ultrasonic power to 500W and ultrasonication for 35 minutes; the vacuum drying temperature is 80℃.

[0070] The mixing mentioned in step A2 refers to stirring at 1000 rpm for 1.1 hours at 60°C.

[0071] All KH-570s require pretreatment. Specifically, KH-570, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:3:1, and 0.15 mol / L acetic acid is added dropwise to adjust the pH to 5. The mixture is then stirred at 150 rpm for 1.2 hours at 50°C to obtain the final product.

[0072] The mixing in step two refers to stirring at 500 rpm for 45 minutes in a 60°C water bath; the continued mixing refers to stirring at 2500 rpm for 1.5 hours.

[0073] The mixing in step three refers to stirring at 300 rpm for 25 minutes at 40°C; the continued mixing refers to stirring at 200 rpm for 10 minutes.

[0074] Example 4

[0075] A method for preparing a dual-purpose, high-adhesion composite offset printing ink, the method comprising the following steps:

[0076] Step 1: Melt rosin and mix it with maleic anhydride and phthalic anhydride. After cooling, add pentaerythritol and glycerol, continue mixing, and cool to obtain rosin-modified resin.

[0077] Step 2: Mix rosin-modified resin, acrylate copolymer, and epoxidized soybean oil, then add dual-modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind until the fineness is ≤5μm to obtain a premix.

[0078] Step 3: Mix the premix and KH-570, then add the photoinitiator and antioxidant, continue mixing, and filter to obtain the final product.

[0079] The raw materials of the composite offset printing ink, by weight, are: 64 parts rosin, 22 parts maleic anhydride, 8.6 parts phthalic anhydride, 17 parts pentaerythritol, 8.5 parts glycerol, 4 parts acrylate copolymer, 2.3 parts epoxidized soybean oil, 5.4 parts dual-modified pigment, 2.37 parts manganese isooctanoate, 0.4 parts dispersant, 0.8 parts KH-570, 0.52 parts photoinitiator, and 0.13 parts antioxidant; the dispersant is BYK-163; the photoinitiator is TPO; and the antioxidant is BHT.

[0080] The mixing in step one refers to stirring at 260 rpm at 192°C for 2.7 hours; the cooling refers to cooling to 123°C; and the continued mixing refers to stirring at 310 rpm for 3.2 hours.

[0081] The preparation method of the dual-modified pigment described in step two includes the following steps:

[0082] Step A1: Mix KH-570 with anhydrous ethanol, then add pigment, continue mixing, and vacuum dry to obtain the initial product;

[0083] Step A2: Mix the primary product with the terminal hydroxyl hyperbranched polyester, cool and pass through a 100-mesh sieve to obtain the final product.

[0084] The raw materials of the dual-modified pigment, by weight, include 10.1 parts pigment, 0.7 parts KH-570, 0.16 parts hydroxyl-terminated hyperbranched polyester, and 23 parts anhydrous ethanol; the pigment is carbon black.

[0085] The mixing in step A1 refers to setting the ultrasonic frequency to 47kHz, the ultrasonic power to 320W, and ultrasonication for 16 minutes; the continued mixing refers to increasing the ultrasonic power to 520W and ultrasonication for 38 minutes; the vacuum drying temperature is 80℃.

[0086] The mixing mentioned in step A2 refers to stirring at 1100 rpm for 1.15 hours at 60°C.

[0087] All KH-570s require pretreatment. Specifically, KH-570, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:3.1:1, and 0.16 mol / L acetic acid is added dropwise to adjust the pH to 5.1. The mixture is then stirred at 180 rpm for 1.3 hours at 50°C to obtain the final product.

[0088] The mixing in step two refers to stirring at 530 rpm for 47 minutes in a 60°C water bath; the continued mixing refers to stirring at 2600 rpm for 1.8 hours.

[0089] The mixing in step three refers to stirring at 320 rpm for 28 minutes at 40°C; the continued mixing refers to stirring at 210 rpm for 11 minutes.

[0090] Example 5

[0091] A method for preparing a dual-purpose, high-adhesion composite offset printing ink, the method comprising the following steps:

[0092] Step 1: Melt rosin and mix it with maleic anhydride and phthalic anhydride. After cooling, add pentaerythritol and glycerol, continue mixing, and cool to obtain rosin-modified resin.

[0093] Step 2: Mix rosin-modified resin, acrylate copolymer, and epoxidized soybean oil, then add dual-modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind until the fineness is ≤5μm to obtain a premix.

[0094] Step 3: Mix the premix and KH-570, then add the photoinitiator and antioxidant, continue mixing, and filter to obtain the final product.

[0095] The raw materials of the composite offset printing ink, by weight, are: 70 parts rosin, 25 parts maleic anhydride, 10 parts phthalic anhydride, 20 parts pentaerythritol, 10 parts glycerol, 5 parts acrylate copolymer, 2.7 parts epoxidized soybean oil, 6.7 parts dual-modified pigment, 3 parts manganese isooctanoate, 0.5 parts dispersant, 1 part KH-570, 0.6 parts photoinitiator, and 0.15 parts antioxidant; the dispersant is BYK-163; the photoinitiator is TPO; and the antioxidant is BHT.

[0096] The mixing in step one refers to stirring at 300 rpm for 3 hours at 195°C; the cooling refers to cooling to 125°C; and the continued mixing refers to stirring at 350 rpm for 3.5 hours.

[0097] The preparation method of the dual-modified pigment described in step two includes the following steps:

[0098] Step A1: Mix KH-570 with anhydrous ethanol, then add pigment, continue mixing, and vacuum dry to obtain the initial product;

[0099] Step A2: Mix the primary product with the terminal hydroxyl hyperbranched polyester, cool and pass through a 100-mesh sieve to obtain the final product.

[0100] The raw materials of the dual-modified pigment, by weight, include 10.2 parts pigment, 0.8 parts KH-570, 0.18 parts hydroxyl-terminated hyperbranched polyester, and 24 parts anhydrous ethanol; the pigment is carbon black.

[0101] The mixing in step A1 refers to setting the ultrasonic frequency to 50kHz, the ultrasonic power to 350W, and ultrasonication for 20 minutes; the continued mixing refers to increasing the ultrasonic power to 550W and ultrasonication for 40 minutes; the vacuum drying temperature is 80℃.

[0102] The mixing mentioned in step A2 refers to stirring at 1200 rpm for 1.2 hours at 60°C.

[0103] All KH-570s require pretreatment. Specifically, KH-570, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:3.2:1, and 0.2 mol / L acetic acid is added dropwise to adjust the pH to 5.2. The mixture is then stirred at 200 rpm for 1.4 hours at 50°C to obtain the final product.

[0104] The mixing in step two refers to stirring at 550 rpm for 50 minutes in a 60°C water bath; the continued mixing refers to stirring at 3000 rpm for 2 hours.

[0105] The mixing in step three refers to stirring at 350 rpm for 30 minutes at 40°C; the continued mixing refers to stirring at 220 rpm for 12 minutes.

[0106] Example 6

[0107] Based on Example 3, the epoxidized soybean oil was removed and replaced with an equal weight of rosin, while other conditions remained the same as in Example 3.

[0108] Comparative Example 1

[0109] Based on Example 3, KH-570 is not pretreated, and other conditions remain the same as in Example 3.

[0110] Comparative Example 2

[0111] Based on Example 3, keeping other conditions unchanged, the preparation method of the dual-modified pigment was changed to include the following steps:

[0112] Step A1: Mix KH-570 with anhydrous ethanol, then add the pigment, continue mixing, vacuum dry, and pass through a 100-mesh sieve to obtain the final product.

[0113] Comparative Example 3

[0114] Based on Example 3, keeping other conditions unchanged, the preparation method of the dual-modified pigment was changed to include the following steps:

[0115] Step A1: Mix the pigment and the terminal hydroxyl hyperbranched polyester, cool and pass through a 100-mesh sieve to obtain the final product.

[0116] Comparative Example 4

[0117] Based on Example 3, keeping other conditions unchanged, the preparation method of the dual-modified pigment was changed to include the following steps:

[0118] Step A1: Mix the pigment with the hydroxyl-terminated hyperbranched polyester and stir at 1000 rpm for 1.1 h at 60 °C. Cool and pass through a 100-mesh sieve to obtain the initial product.

[0119] Step A2: Mix KH-570 with anhydrous ethanol, set the ultrasonic frequency to 45kHz and the ultrasonic power to 300W, sonicate for 15 minutes, then add the primary product, increase the ultrasonic power to 500W, sonicate for 35 minutes, and vacuum dry at 80℃ to obtain the final product.

[0120] The composite offset printing inks prepared in Examples 1-6 and Comparative Examples 1-4 were used as samples. The coating surface was tested by the cross-cut test according to GB / T 9286-1988. The best result was grade 0. The test results are recorded in Table 1 below.

[0121] Using the composite offset printing inks prepared in Examples 1-6 as samples, under conditions of 25°C and 65% relative humidity, 0.15 mL of the sample was scraped onto tracing paper (approximately 220 cm²). 2 After 18 hours, the drying state (i.e., curing property) of the ink was confirmed by scratching the sample, and the results are recorded in Table 1 below; 0.15 mL of sample was printed on PET film for approximately 220 cm. 2 The area was cured by irradiation with a 385nm ultraviolet light-emitting diode at a distance of 1cm, an output of 100%, a linear velocity of 120m / min, and a cumulative light intensity of 15mJ / cm². 2 After irradiation, the drying state (i.e. curability) of the ink was confirmed by scratching the sample, and the results were recorded as shown in Table 1 below. The drying state was evaluated according to 5 levels, where 5 is completely dry and no damage is produced under strong friction, 4 is dry and slight damage is produced under strong friction, 3 is roughly dry and obvious damage is produced under strong friction, 2 is slightly dry and obvious damage is produced under weak friction, and 1 is completely dry.

[0122] Table 1

[0123]

[0124] As shown in Table 1, the composite offset printing ink prepared by the present invention can be cured by oxidation or by UV curing, and is suitable for different printing scenarios. In addition, the composite offset printing ink of the present invention has high adhesion performance and is not prone to peeling, scratches or other problems during use, and is practical.

[0125] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for preparing a dual-purpose high-adhesion composite offset printing ink, characterized in that: The preparation method of composite offset printing ink includes the following steps: Step 1: Melt rosin and mix it with maleic anhydride and phthalic anhydride. After cooling, add pentaerythritol and glycerol, continue mixing, and cool to obtain rosin-modified resin. Step 2: Mix rosin-modified resin, acrylate copolymer, and epoxidized soybean oil, then add dual-modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind until the fineness is ≤5μm to obtain a premix. Step 3: Mix the premix and KH-570, then add the photoinitiator and antioxidant, continue mixing, and filter to obtain the final product; The raw materials of the composite offset printing ink, by weight, are: 50-70 parts rosin, 15-25 parts maleic anhydride, 5-10 parts phthalic anhydride, 10-20 parts pentaerythritol, 5-10 parts glycerol, 1-5 parts acrylate copolymer, 0.5-2.7 parts epoxidized soybean oil, 1.3-6.7 parts dual-modified pigment, 0.1-3 parts manganese isooctanoate, 0.1-0.5 parts dispersant, 0.2-1 part KH-570, 0.3-0.6 parts photoinitiator, and 0.07-0.15 parts antioxidant; The preparation method of the dual-modified pigment described in step two includes the following steps: Step A1: Mix KH-570 with anhydrous ethanol, then add pigment, continue mixing, and vacuum dry to obtain the initial product; Step A2: Mix the primary product with the hydroxyl-terminated hyperbranched polyester, cool and pass through a 100-mesh sieve to obtain the final product; The raw materials of the dual-modified pigment, by weight, include 9.6-10.2 parts pigment, 0.4-0.8 parts KH-570, 0.12-0.18 parts hydroxyl-terminated hyperbranched polyester, and 20-24 parts anhydrous ethanol; the pigment includes carbon black and phthalocyanine blue.

2. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, characterized in that: The mixing in step one refers to stirring at 200-300 rpm for 2-3 hours at 185-195℃; the cooling refers to cooling to 115-125℃; and the continued mixing refers to stirring at 250-350 rpm for 2.5-3.5 hours.

3. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, characterized in that: The mixing in step A1 refers to setting the ultrasonic frequency to 40-50kHz, the ultrasonic power to 250-350W, and ultrasonication for 10-20 minutes; the continued mixing refers to increasing the ultrasonic power to 450-550W and ultrasonication for 30-40 minutes; the vacuum drying temperature is 80℃.

4. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, characterized in that: The mixing mentioned in step A2 refers to stirring at 800-1200 rpm at 60°C for 1-1.2 hours.

5. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, characterized in that: All KH-570s require pretreatment. Specifically, KH-570, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:2.8-3.2:1, and 0.1-0.2 mol / L acetic acid is added dropwise to adjust the pH to 4.8-5.

2. The mixture is then stirred at 100-200 rpm for 1-1.4 hours at 50°C.

6. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, characterized in that: The mixing in step two refers to stirring at 450-550 rpm for 40-50 minutes in a 60℃ water bath; the continued mixing refers to stirring at 2000-3000 rpm for 1-2 hours.

7. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, characterized in that: The mixing in step three refers to stirring at 250-350 rpm for 20-30 minutes at 40°C; the continued mixing refers to stirring at 180-220 rpm for 8-12 minutes.

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