Dual-purpose high-adhesion composite offset printing ink and preparation method thereof

Abstract

The invention relates to dual-purpose high-adhesion composite offset printing ink and a preparation method thereof, and belongs to the technical field of offset printing. The invention provides a preparation method of dual-purpose high-adhesion composite offset printing ink, which comprises the following steps of: melting rosin, mixing with maleic anhydride and phthalic anhydride, cooling, adding pentaerythritol and glycerol, continuously mixing, cooling to obtain rosin modified resin, adding acrylate copolymer and epoxidized soybean oil, mixing, and uniformly mixing to obtain the dual-purpose high-adhesion composite offset printing ink. The preparation method comprises the following steps: adding KH-570 into a reaction kettle, adding a double-modified pigment, manganese isooctanoate and a dispersant, continuously mixing and grinding to obtain a premix, mixing with KH-570, adding a photoinitiator and an antioxidant, continuously mixing, and filtering to obtain the product. According to the invention, the cooperation of UV curing and oxidation curing is realized by adjusting the formula, and meanwhile, the dual-modification pigment, the acrylate copolymer and the like are introduced to realize the interface bonding between the ink and a curing layer and between the ink and a UV curing layer or an oxidation curing layer, so that layering is avoided, and the high adhesion of the ink is promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of offset printing and relates to a dual-purpose high-adhesion composite offset printing ink and a preparation method thereof. Background Art

[0002] Offset ink is a special ink used in offset printing and has a wide range of applications, including newspapers, magazines, books, and other printed materials. Current offset inks are typically either single-photocurable or single-natural oxidation. While photocurable inks can achieve instant drying, they require high energy consumption and exhibit poor adhesion to non-polar substrates. Natural oxidation inks, while environmentally friendly, dry slowly and cannot meet the demands of efficient production. To balance the advantages of both, it is necessary to develop dual-purpose offset inks. However, the drying speed slows when photocurable inks are converted to natural oxidation inks, and the conversion of natural oxidation inks to photocurable inks can result in incomplete curing or decreased adhesion due to insufficient reaction activity. These issues remain to be addressed. Summary of the Invention

[0003] The object of the present invention is to provide a dual-use high-adhesion composite offset printing ink and a preparation method thereof. The present invention achieves the synergy of UV curing and oxidative curing by adjusting the formula, and at the same time introduces dual-modified pigments, acrylate copolymers, etc. to achieve interfacial bonding between the ink and the curing layer, as well as the UV curing layer or the oxidative curing layer, thereby avoiding stratification and promoting high adhesion of the ink.

[0004] The purpose of the present 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: Melting rosin and mixing it with maleic anhydride and phthalic anhydride, cooling it, adding pentaerythritol and glycerin, continuing to mix, and cooling it to obtain a rosin-modified resin;

[0007] Step 2: Mix rosin modified resin, acrylate copolymer, and epoxy soybean oil, then add double modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind to a fineness of ≦5 μm 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 product.

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

[0010] Furthermore, the mixing in step 1 refers to stirring at 185-195° C. and 200-300 rpm for 2-3 hours; the cooling refers to cooling to 115-125° C.; and the continued mixing refers to stirring at 250-350 rpm for 2.5-3.5 hours.

[0011] Furthermore, the preparation method of the double-modified pigment in step 2 comprises the following steps:

[0012] Step A1: KH-570 is mixed with anhydrous ethanol, and then a pigment is added, the mixture is continued to be mixed, and vacuum dried to obtain a primary product;

[0013] Step A2: mixing the primary product and the hydroxyl-terminated hyperbranched polyester, cooling and passing through a 100-mesh sieve to obtain the product.

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

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

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

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

[0018] Furthermore, the mixing in step 2 refers to stirring at a speed of 450-550 rpm for 40-50 min in a 60° C. water bath; and the continued mixing refers to stirring at a speed of 2000-3000 rpm for 1-2 h.

[0019] Furthermore, the mixing in step 3 refers to stirring at 250-350 rpm for 20-30 min at 40° C.; and the continued mixing refers to stirring at 180-220 rpm for 8-12 min.

[0020] Beneficial effects of the present invention:

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

[0022] (2) On the basis of realizing two curing pathways, the present invention introduces epoxidized soybean oil, in which the epoxy groups may play a role in auxiliary cross-linking and participate in the co-construction of the cross-linked network; in addition, the acrylate copolymer contains flexible chain ends, which can reduce the interfacial peeling caused by curing shrinkage, synergistically realize the interfacial bonding between the ink and the cured layer, avoid stratification, and promote high adhesion of the ink.

[0023] (3) The present invention introduces a double-modified pigment into the formula. The pretreated KH-570 is modified on the surface of the pigment, giving the pigment more active sites, and then forming 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, are combined through van der Waals forces, ultimately forming a double modification. The organic chain segments of KH-570 have similar polarity to the resin matrix, and the three-dimensional structure of the hyperbranched polyester fills the micropores at the resin-pigment interface, reducing stress concentration. Its polyhydroxyl structure forms a hydrogen bond network with the resin, further improving the interfacial bonding strength and giving the ink high adhesion performance. DETAILED DESCRIPTION

[0024] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0025] Glycerol, epoxidized soybean oil, BYK-163, KH-570 (E51), TPO, and BHT in all embodiments and comparative examples of the present invention were purchased directly from the market and were purchased from Jining Tangyi Chemical Co., Ltd.; maleic anhydride was purchased directly from the market and was purchased from Jinan Aoxing Chemical Co., Ltd.; phthalic anhydride was purchased directly from the market and was purchased from Shandong Jinhe Chemical Co., Ltd.; pentaerythritol was purchased directly from the market and was purchased from Foshan Yincheng Chemical Co., Ltd.; the acrylate copolymer was specifically acrylic acid-hydroxypropyl acrylate copolymer, which was purchased directly from the market and was purchased from Hubei Dali Chemical Co., Ltd.; carbon black was purchased directly from the market and was purchased from Tianjin Jifa Pigment Co., Ltd.; anhydrous ethanol and acetic acid were purchased directly from the market and were purchased from Sigma-Aldrich (Shanghai) Trading Co., Ltd.; the terminal hydroxyl hyperbranched polyesters were purchased directly from the market and were purchased from Guangdong Fangxin Biotechnology Co., Ltd.; manganese isooctanoate was purchased 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: Melting rosin and mixing it with maleic anhydride and phthalic anhydride, cooling it, adding pentaerythritol and glycerin, continuing to mix, and cooling it to obtain a rosin-modified resin;

[0029] Step 2: Mix rosin modified resin, acrylate copolymer, and epoxy soybean oil, then add double modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind to a fineness of ≦5 μm 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 product.

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

[0032] In step 1, the mixing refers to stirring at 200 rpm at 185° C. for 2 h; the cooling refers to cooling to 115° C.; and the continued mixing refers to stirring at 250 rpm for 2.5 h.

[0033] The preparation method of the double-modified pigment in step 2 comprises the following steps:

[0034] Step A1: KH-570 is mixed with anhydrous ethanol, and then a pigment is added, the mixture is continued to be mixed, and vacuum dried to obtain a primary product;

[0035] Step A2: mixing the primary product and the hydroxyl-terminated hyperbranched polyester, cooling and passing through a 100-mesh sieve to obtain the product.

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

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

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

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

[0040] The mixing in step 2 refers to stirring at 450 rpm for 40 min in a 60° C. water bath; the continued mixing refers to stirring at 2000 rpm for 1 h.

[0041] The mixing in step 3 refers to stirring at 250 rpm for 20 min at 40° C.; the continued mixing refers to stirring at 180 rpm for 8 min.

[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: Melting rosin and mixing it with maleic anhydride and phthalic anhydride, cooling it, adding pentaerythritol and glycerin, continuing to mix, and cooling it to obtain a rosin-modified resin;

[0045] Step 2: Mix rosin modified resin, acrylate copolymer, and epoxy soybean oil, then add double modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind to a fineness of ≦5 μm 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 product.

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

[0048] The mixing in step 1 refers to stirring at 220 rpm for 2.3 hours at 188° C.; 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 double-modified pigment in step 2 comprises the following steps:

[0050] Step A1: KH-570 is mixed with anhydrous ethanol, and then a pigment is added, the mixture is continued to be mixed, and vacuum dried to obtain a primary product;

[0051] Step A2: mixing the primary product and the hydroxyl-terminated hyperbranched polyester, cooling and passing through a 100-mesh sieve to obtain the product.

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

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

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

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

[0056] The mixing in step 2 refers to stirring at 460 rpm for 42 min in a 60° C. water bath; the continued mixing refers to stirring at 2300 rpm for 1.4 h.

[0057] The mixing in step 3 refers to stirring at 280 rpm for 23 min at 40° C.; the continued mixing refers to stirring at 190 rpm for 9 min.

[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: Melting rosin and mixing it with maleic anhydride and phthalic anhydride, cooling it, adding pentaerythritol and glycerin, continuing to mix, and cooling it to obtain a rosin-modified resin;

[0061] Step 2: Mix rosin modified resin, acrylate copolymer, and epoxy soybean oil, then add double modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind to a fineness of ≦5 μm 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 product.

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

[0064] In step 1, the mixing refers to stirring at 250 rpm for 2.5 hours at 190° C.; 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 double-modified pigment in step 2 comprises the following steps:

[0066] Step A1: KH-570 is mixed with anhydrous ethanol, and then a pigment is added, the mixture is continued to be mixed, and vacuum dried to obtain a primary product;

[0067] Step A2: mixing the primary product and the hydroxyl-terminated hyperbranched polyester, cooling and passing through a 100-mesh sieve to obtain the product.

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

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

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

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

[0072] The mixing in step 2 refers to stirring at 500 rpm for 45 min in a 60° C. water bath; the continued mixing refers to stirring at 2500 rpm for 1.5 h.

[0073] The mixing in step 3 refers to stirring at 300 rpm for 25 min at 40° C.; the continued mixing refers to stirring at 200 rpm for 10 min.

[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: Melting rosin and mixing it with maleic anhydride and phthalic anhydride, cooling it, adding pentaerythritol and glycerin, continuing to mix, and cooling it to obtain a rosin-modified resin;

[0077] Step 2: Mix rosin modified resin, acrylate copolymer, and epoxy soybean oil, then add double modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind to a fineness of ≦5 μm 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 product.

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

[0080] In step 1, the mixing refers to stirring at 260 rpm for 2.7 hours at 192° C.; 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 double-modified pigment in step 2 comprises the following steps:

[0082] Step A1: KH-570 is mixed with anhydrous ethanol, and then a pigment is added, the mixture is continued to be mixed, and vacuum dried to obtain a primary product;

[0083] Step A2: mixing the primary product and the hydroxyl-terminated hyperbranched polyester, cooling and passing through a 100-mesh sieve to obtain the product.

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

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

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

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

[0088] The mixing in step 2 refers to stirring at 530 rpm for 47 min in a 60° C. water bath; the continued mixing refers to stirring at 2600 rpm for 1.8 h.

[0089] The mixing in step 3 refers to stirring at 320 rpm for 28 min at 40° C.; the continued mixing refers to stirring at 210 rpm for 11 min.

[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: Melting rosin and mixing it with maleic anhydride and phthalic anhydride, cooling it, adding pentaerythritol and glycerin, continuing to mix, and cooling it to obtain a rosin-modified resin;

[0093] Step 2: Mix rosin modified resin, acrylate copolymer, and epoxy soybean oil, then add double modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind to a fineness of ≦5 μm 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 product.

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

[0096] In step 1, the mixing 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 double-modified pigment in step 2 comprises the following steps:

[0098] Step A1: KH-570 is mixed with anhydrous ethanol, and then a pigment is added, the mixture is continued to be mixed, and vacuum dried to obtain a primary product;

[0099] Step A2: mixing the primary product and the hydroxyl-terminated hyperbranched polyester, cooling and passing through a 100-mesh sieve to obtain the product.

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

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

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

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

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

[0105] The mixing in step 3 refers to stirring at 350 rpm for 30 min at 40° C.; the continued mixing refers to stirring at 220 rpm for 12 min.

[0106] Example 6

[0107] On the basis of Example 3, the epoxy soybean oil was removed and replaced with an equal weight of rosin, and other conditions remained the same as in Example 3.

[0108] Comparative Example 1

[0109] On the basis of Example 3, KH-570 was not pretreated, and other conditions remained the same as in Example 3.

[0110] Comparative Example 2

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

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

[0113] Comparative Example 3

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

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

[0116] Comparative Example 4

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

[0118] Step A1, mixing the pigment and the hydroxyl-terminated hyperbranched polyester, stirring at 1000 rpm at 60° C. for 1.1 h, cooling, and passing through a 100-mesh sieve to obtain a primary product;

[0119] Step A2: After mixing KH-570 with anhydrous ethanol, set the ultrasonic frequency to 45 kHz and the ultrasonic power to 300 W for 15 minutes, then add the initial product, increase the ultrasonic power to 500 W, ultrasonicate for 35 minutes, and vacuum dry at 80°C to obtain the product.

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

[0121] The composite offset printing ink prepared in Example 1-6 was used as a sample. Under the conditions of temperature of 25°C and relative humidity of 65%, 0.15 mL of the sample was scraped and covered with sulfuric acid paper (with an area of about 220 cm 2 ), after 18 hours, 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; 0.15 mL of the sample was printed on a PET film with a diameter of about 220 cm 2 The area was cured by UV light emitting diode with a wavelength of 385nm, the irradiation distance was 1cm, the output was 100%, the line speed was 120m / min, and the cumulative light value was 15mJ / cm 2 After the irradiation, the drying state (i.e., curing property) 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, 5 being completely dry and not damaged even under strong friction, 4 being dry and slightly damaged under strong friction, 3 being roughly dry and obviously damaged under strong friction, 2 being slightly dry and obviously damaged even under weak friction, and 1 being completely dry.

[0122] Table 1

[0123]

[0124] As can be seen from Table 1, the composite offset printing ink prepared by the present invention can be cured by oxidation or 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 falling off or scratching during use, and is practical.

[0125] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any indirect modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution 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 the composite offset printing ink comprises the following steps: Step 1: Melting rosin and mixing it with maleic anhydride and phthalic anhydride, cooling it, adding pentaerythritol and glycerin, continuing to mix, and cooling it to obtain a rosin-modified resin; Step 2: Mix rosin modified resin, acrylate copolymer, and epoxy soybean oil, then add double modified pigment, manganese isooctanoate, and dispersant, continue mixing, and grind to a fineness of ≦5 μm 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 product.

2. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, characterized in that: The raw materials of the composite offset printing ink are, by weight, 50-70 parts of rosin, 15-25 parts of maleic anhydride, 5-10 parts of phthalic anhydride, 10-20 parts of pentaerythritol, 5-10 parts of glycerin, 1-5 parts of acrylate copolymer, 0.5-2.7 parts of epoxy soybean oil, 1.3-6.7 parts of double-modified pigment, 0.1-3 parts of manganese isooctanoate, 0.1-0.5 parts of dispersant, 0.2-1 parts of KH-570, 0.3-0.6 parts of photoinitiator, and 0.07-0.15 parts of antioxidant.

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

4. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, wherein: The preparation method of the double-modified pigment in step 2 comprises the following steps: Step A1: KH-570 is mixed with anhydrous ethanol, and then a pigment is added, the mixture is continued to be mixed, and vacuum dried to obtain a primary product; Step A2: mixing the primary product and the hydroxyl-terminated hyperbranched polyester, cooling and passing through a 100-mesh sieve to obtain the product.

5. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 4, characterized in that: The raw materials of the double-modified pigment include, by weight, 9.6-10.2 parts of pigment, 0.4-0.8 parts of KH-570, 0.12-0.18 parts of terminal hydroxyl hyperbranched polyester, and 20-24 parts of anhydrous ethanol; the pigment includes carbon black and phthalocyanine blue.

6. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 4, characterized in that: The mixing in step A1 refers to setting the ultrasonic frequency to 40-50kHz, the ultrasonic power to 250-350W, and the ultrasonication for 10-20min; the continued mixing refers to increasing the ultrasonic power to 450-550W and the ultrasonication for 30-40min; the vacuum drying temperature is 80°C.

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

8. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1 or 4, characterized in that: The KH-570 needs to be pretreated. Specifically, KH-570, anhydrous ethanol, and deionized water are mixed in a mass ratio of 1:2.8-3.2:1, 0.1-0.2 mol / L acetic acid is added dropwise to adjust the pH to 4.8-5.2, and the mixture is stirred at 100-200 rpm at 50°C for 1-1.4 hours.

9. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, characterized in that: In step 2, the mixing refers to stirring at 450-550 rpm for 40-50 min in a 60° C. water bath; and the continued mixing refers to stirring at 2000-3000 rpm for 1-2 h.

10. The method for preparing a dual-purpose high-adhesion composite offset printing ink according to claim 1, characterized in that: The mixing in step 3 refers to stirring at 250-350 rpm for 20-30 min at 40° C.; the continued mixing refers to stirring at 180-220 rpm for 8-12 min.

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