Universal water-based blue ink and preparation method thereof

Abstract

The invention discloses universal water-based blue ink and a preparation method thereof, and relates to the field of novel environment-friendly water-based ink, and the universal water-based blue ink is prepared from the following raw materials in parts by weight: 35-45 parts of phthalocyanine blue, 35-40 parts of binder (modified polyurethane emulsion and modified polyurethane emulsion), 3-5 parts of isopropanol, 8-13 parts of ethanol, 4-8 parts of water, 0.004 part of defoaming agent and 0.01-0.03 part of flatting agent. And 1-2 parts of ED30 matt powder (selenium dioxide). The water-based blue ink has the advantages of good printability, bright color, safety, environmental protection, fast printing speed, high adhesive force, difficult fading, friction resistance and high peel strength, is applied to plastic flexible package PE, PA, OPP / VMCPP and the like, can ensure low cost, has a printing speed of more than 180m / min, and is an environment-friendly water-based ink.

Description

Technical Field

[0001] The invention relates to the field of novel environmentally friendly water-based ink, and more specifically to a universal water-based blue ink and a preparation method thereof. Background Art

[0002] At present, 90% of enterprises in my country's film and flexible packaging industry use gravure printing technology, and most of them use solvent-based inks. However, this type of ink is restricted in the face of increasingly severe environmental protection situations, and is even banned in some economically developed areas. Especially in the past two years, my country's central and local provincial and municipal environmental protection departments have introduced a series of policies and regulations to reduce VOCs. Flexible packaging companies have to install organic waste gas treatment equipment at the end of production. The end treatment technology has developed rapidly in the past few years, but it cannot really solve the problem from the source, which greatly restricts its application.

[0003] In recent years, as people's environmental awareness has increased, the research and development of water-based inks has attracted widespread attention. Water-based inks are inks that use water as a solvent. The advantages of water as a solvent are that it is non-toxic, odorless, and non-flammable. It also greatly reduces the emission of waste gas and reduces pollution to the environment. Therefore, it has developed rapidly and has a very broad development prospect.

[0004] In recent years, as people's environmental awareness has increased, the research and development of water-based inks has attracted widespread attention. The choice of pigments in water-based inks has a great impact on inks. Phthalocyanine blue has broad application prospects in inks, plastics, printing and dyeing, and artworks due to its bright color, durability, and chemical stability. However, in actual applications, phthalocyanine blue pigments have poor dispersibility in inks, which limits their application.

[0005] Therefore, it is necessary to propose a universal water-based blue ink and a preparation method thereof to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problems raised in the above background technology, and to provide a universal water-based blue ink and a preparation method thereof.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0008] A universal water-based blue ink and a preparation method thereof, comprising the following raw materials in parts by weight:

[0009] Modified polyurethane emulsion 1: 25-35 parts, modified polyurethane emulsion 2: 5-15 parts, isopropyl alcohol: 3-5 parts, ethanol: 8-13 parts, water: 4-8 parts, phthalocyanine blue: 30-45 parts, defoaming agent: 0.004 parts, leveling agent: 0.01-0.03 parts, ED30 matte powder (selenium dioxide): 1-3 parts.

[0010] The universal water-based blue ink and the preparation method thereof comprise the following steps:

[0011] S1, dissolving: adding the modified polyurethane emulsion 1, isopropanol and ethanol in a certain ratio into a reaction container, then adding a defoamer, stirring and dissolving;

[0012] S2, mixing: adding phthalocyanine blue, water, leveling agent, and ED30 matte powder to the dissolved material, and continuing to stir to obtain a mixture;

[0013] S3, ball milling: taking out the mixed material and adding it into a ball mill for grinding. The blue ink particle size obtained after ball milling is 10-15 μm, and the grinding material is obtained;

[0014] S4, molding: Add the obtained ground material to the modified polyurethane emulsion 2, stir and mix, and obtain the finished material.

[0015] Preferably, the preparation process of the phthalocyanine blue material is as follows:

[0016] Step 1. In a 150 ml round-bottom flask, add 4,5-dichloro-o-dicyanobenzene (3.94 g, 20 mmol), dry K2CO3 (8.28 g, 60 mmol) and 50 ml of dimethylacetamide. In the presence of nitrogen, after half an hour of stirring, add isopropyl mercaptan (3.65 g, 48 mmol) to the reaction system through a syringe, react at 90 ° C for 6 hours, then pour the reaction solution into 100 ml of cold water, precipitate appears and is collected, and then recrystallized with cold ethanol (200 ml) to obtain a white product (4.1 g, 75%).

[0017] Step 2: In the presence of nitrogen, n-pentanol (6 ml) was added to a reactor containing 4,5-diisopropylthio-o-dicyanobenzene (0.55 g, 2 mmol), and DBU (0.61 g) was added, and the mixture was heated to reflux for 8 h. After cooling to room temperature, n-pentanol was removed by vacuum distillation. Then, chloroform was used as the eluent to purify on a silica gel column, and the obtained crude product was recrystallized with chloroform / methanol. A dark green product (0.22 g, 40%) was obtained, which was recorded as compound 1.

[0018] Step 3: Add compound 1 (111 mg, 0.10 mmol), Cu(OAc)2.H2O (40 mg, 0.20 mmol), and DMF (4 ml) into a reactor, and then heat under reflux in the presence of nitrogen for about 5 h. After the reaction is completed, evaporate the solvent under reduced pressure, purify on a silica gel column with chloroform as the eluent, and then recrystallize with chloroform / methanol to obtain a dark green compound (100 mg, 85%), which is the phthalocyanine blue product.

[0019] Preferably, the modified polyurethane emulsion 1 is polyether modified and has multiple side groups (methyl) introduced to improve its water resistance, with a viscosity of 800-1000 and an acid value of 6.9-7.2.

[0020] Preferably, the modified polyurethane emulsion 2 is a polyurethane emulsion having carbonate groups introduced into the polyurethane molecules, a viscosity of 1000-1200, and an acid value of 7.0-7.5.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Use modified polyurethane resins 1 and 2 to make the two polyurethane resin materials cooperate with each other, combine the excellent properties of water-based polyurethane, improve its water resistance, adhesion, and peel strength, make it show good dispersion and optical properties in ink, and have bright and lasting colors.

[0023] 2. The water-based blue ink has good printability, bright colors, safety and environmental protection, fast printing speed, high adhesion, not easy to fade, friction resistance, and high peel strength. The ink is used in plastic flexible packaging PE, PA and OPP / VMCPP, etc. It can ensure low cost while the printing speed reaches more than 180m / min. It is an environmentally friendly water-based ink.

[0024] 3. The modified polyurethane resin 1 has good water resistance and hiding power due to the modification of the groups, and it can resist friction and has good temperature resistance, but its adhesion is slightly poor. The modified polyurethane resin 2 has good dispersibility and adhesion through the introduction of carbonate, but it is not resistant to friction and has poor temperature resistance. Adding modified polyurethane resin 2 to modified polyurethane resin 1 can greatly improve the adhesion. The defoaming agent can eliminate bubbles and promote better dispersion of the connecting material. The leveling agent also plays a good dispersing and fusion role. ED30 matte powder (selenium dioxide) can play a role in weather resistance, making its adhesion and hue stable. The Cu-S metal coordination bond synergistic force introduced in the phthalocyanine blue pigment enables it to assemble into one-dimensional long nanowires, showing good dispersion and optical properties. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1:

[0027] The universal surface printing and back printing packaging water-based blue ink is prepared from the following raw materials, each component is measured by weight:

[0028] Modified polyurethane emulsion 1: 30 parts, modified polyurethane emulsion 2: 13 parts, isopropyl alcohol: 3 parts, ethanol: 9 parts, water: 5 parts, phthalocyanine blue: 37 parts, defoaming agent: 0.004 parts, leveling agent: 0.03, ED30 matte powder (selenium dioxide): 2.966 parts.

[0029] 1) Add the modified polyurethane emulsion 1, isopropanol and ethanol in a certain ratio into a reaction container, then add the defoamer, and stir and disperse with a high-speed disperser for 20 minutes to fully dissolve;

[0030] 2) Then add phthalocyanine blue, water, leveling agent, ED30 matte powder (selenium dioxide), and continue stirring for 50 minutes;

[0031] 3) The reaction product obtained in step 2) was taken out and added into a ball mill for grinding for 60 minutes, and the obtained blue ink particle size was 10 μm.

[0032] 4) Add the ground product obtained in step 3) to the modified polyurethane emulsion 2 and stir and mix.

[0033] Embodiment 2:

[0034] Modified polyurethane emulsion 1: 33 parts, modified polyurethane emulsion 2: 12 parts, isopropyl alcohol: 4 parts, ethanol: 10 parts, water: 6 parts, phthalocyanine blue: 32 parts, defoaming agent: 0.004 parts, leveling agent: 0.016, ED30 matte powder (selenium dioxide): 2.98 parts.

[0035] The preparation method is the same as Example 1.

[0036] Application Examples

[0037] The test indicators of the universal surface printing and back printing packaging water-based blue ink used in the present invention in actual application are as follows:

[0038] 1. Fast drying speed, printing speed reaches 180m / min;

[0039] 2. Good adhesion: According to 3M tape test, the PE film made of water-based blue ink for general surface printing and back printing packaging of the present invention does not lose ink, while the PE film made of ordinary blue ink has ink loss phenomenon;

[0040] 3. Friction resistance: The PE film made of water-based blue ink for general surface printing and inner printing packaging of the present invention is tested with a weight of 30g / rubber. After rubbing back and forth 10,000 times, there is no obvious color difference change in the fonts and patterns; it is clearly recognizable without falling off or breaking;

[0041] PE film made of ordinary blue ink: After rubbing back and forth 1,000 times, the font and pattern have obvious color changes; they are recognizable, with a little peeling and broken lines.

[0042] 4. High peeling strength: The OPP / VMCPP composite film made of water-based blue ink for general surface printing and back printing packaging of the present invention has an average peeling strength of 1.33N at 180°C; the OPP / VMCPP composite film made of ordinary blue ink has an average peeling strength of 1.03N at 180°C.

Claims

1. A universal water-based blue ink and a preparation method thereof, characterized in that: It is composed of the following raw materials in parts by weight: Modified polyurethane emulsion 1: 25-35 parts, modified polyurethane emulsion 2: 5-15 parts, isopropyl alcohol: 3-5 parts, ethanol: 8-13 parts, water: 4-8 parts, phthalocyanine blue: 30-45 parts, defoaming agent: 0.004 parts, leveling agent: 0.01-0.03 parts, ED30 matte powder (selenium dioxide): 1-3 parts. The universal water-based blue ink and the preparation method thereof comprise the following steps: S1, dissolving: adding the modified polyurethane emulsion 1, isopropanol and ethanol in a certain ratio into a reaction container, then adding a defoamer, stirring and dissolving; S2, mixing: adding phthalocyanine blue, water, leveling agent, and ED30 matte powder to the dissolved material, and continuing to stir to obtain a mixture; S3, ball milling: taking out the mixed material and adding it into a ball mill for grinding. The blue ink particle size obtained after ball milling is 10-15 μm, and the grinding material is obtained; S4, molding: Add the obtained ground material to the modified polyurethane emulsion 2, stir and mix, and obtain the finished material.

2. A universal water-based blue ink and a preparation method thereof according to claim 1, characterized in that: The preparation process of the phthalocyanine blue material is as follows: Step 1. In a 150 ml round-bottom flask, add 4,5-dichloro-o-dicyanobenzene (3.94 g, 20 mmol), dry K2CO3 (8.28 g, 60 mmol) and 50 ml of dimethylacetamide. In the presence of nitrogen, after half an hour of stirring, add isopropyl mercaptan (3.65 g, 48 mmol) to the reaction system through a syringe, react at 90 ° C for 6 hours, then pour the reaction solution into 100 ml of cold water, precipitate appears and is collected, and then recrystallized with cold ethanol (200 ml) to obtain a white product (4.1 g, 75%). Step 2: In the presence of nitrogen, n-pentanol (6 ml) was added to a reactor containing 4,5-diisopropylthio-o-dicyanobenzene (0.55 g, 2 mmol), and DBU (0.61 g) was added, and the mixture was heated to reflux for 8 h. After cooling to room temperature, n-pentanol was removed by vacuum distillation. Then, chloroform was used as the eluent to purify on a silica gel column, and the obtained crude product was recrystallized with chloroform / methanol. A dark green product (0.22 g, 40%) was obtained, which was recorded as compound 1. Step 3: Add compound 1 (111 mg, 0.10 mmol), Cu(OAc)2.H2O (40 mg, 0.20 mmol), and DMF (4 ml) into a reactor, and then heat under reflux in the presence of nitrogen for about 5 h. After the reaction is completed, evaporate the solvent under reduced pressure, purify on a silica gel column with chloroform as the eluent, and then recrystallize with chloroform / methanol to obtain a dark green compound (100 mg, 85%), which is the phthalocyanine blue product.

3. A universal water-based blue ink and a preparation method thereof according to claim 1, characterized in that: The modified polyurethane emulsion 1 is polyether modified and has multiple side groups (methyl) introduced to improve its water resistance. The viscosity is 800-1000 and the acid value is 6.9-7.

2.

4. A universal water-based blue ink and a preparation method thereof according to claim 1, characterized in that: The modified polyurethane emulsion 2 is a polyurethane molecule having carbonate groups introduced therein, with a viscosity of 1000-1200 and an acid value of 7.0-7.5.