A soft light fast matte water-based ink and a preparation method thereof

Abstract

The present application relates to the technical field of water-based ink, and particularly relates to soft light-fast matte water-based ink and a preparation method thereof. The soft light-fast matte water-based ink comprises the following raw materials in percentage by weight: 35-50% of acrylic modified polyurethane matte emulsion, 30-45% of light-fast matte color paste, 2-7% of anti-wear and anti-glare agent, 0.1-0.5% of defoaming agent, and 8-15% of deionized water. The soft light-fast matte water-based ink has the advantages of softness similar to leather, no cracking after repeated folding, light-fastness and migration resistance, excellent touch and low gloss, no need to add powder material for light extinction, no oxidation after gold or silver stamping, low VOCs content, bright color, good flow and good printing adaptability. The preparation method of the soft light-fast matte water-based ink is convenient to produce, simple to operate and beneficial to industrial production.

Description

Technical Field

[0001] This invention relates to the field of water-based ink technology, and in particular to a soft, lightfast, matte water-based ink and its preparation method. Background Technology

[0002] As people become more environmentally conscious and the environmental situation becomes increasingly severe, the application of leather in daily life is gradually shifting. More and more imitation leather paper printed products are emerging in the market to replace leather printed products, which places higher demands on the softness of water-based inks. Moreover, gift packaging is becoming more and more diversified and high-end, especially tactile products. Now, some high-end gift boxes and jewelry boxes are coated with a layer of matte tactile varnish, which has an excellent tactile feel, like silk and velvet. Therefore, it also puts forward the requirement of low gloss for the water-based inks used in the previous printing. In addition, in order to make the product packaging more eye-catching, a hot stamping process is required in the later processing, which requires water-based inks to have anti-oxidation effects. Due to the value of the items, water-based inks must not change color over long periods of time. This necessitates the use of water-based inks that are resistant to sunlight and migration. As a result of market demand, soft, light-resistant, matte water-based inks have emerged. Soft, light-resistant, matte water-based inks are mainly used in specialty paper printing, and are also applied to various everyday products such as wine boxes, cigarette packs (environmentally friendly products), red envelopes, paper bags, mobile phone boxes, jewelry, mooncake boxes, and wedding certificate covers. These applications are closely related to our lives, making printed products more upscale and enhancing their artistic effect.

[0003] However, most commercially available soft, sun-resistant matte products achieve their matte effect by adding matting powder. This method generates a lot of dust during production, which can affect the health of workers. The addition of matting powder also affects the film-forming properties of the resin, resulting in insufficient softness and a tendency to crack after repeated folding. Furthermore, inks with added matting powder exhibit strong thixotropy and poor fluidity, leading to poor leveling in printed materials. Insufficient wetting during the dispersion of the matting powder can also cause the printed material to appear white, affecting its vibrancy. Summary of the Invention

[0004] To address the shortcomings of the prior art, one objective of this invention is to provide a soft, light-resistant, matte water-based ink for coating and printing. This soft, light-resistant, matte water-based ink has the advantages of good softness, light resistance, migration resistance, low gloss, and good leveling. It also has high color saturation, good printability, good stability, and good environmental friendliness.

[0005] Another objective of this invention is to provide a method for preparing a soft, light-resistant, matte water-based ink. This method is convenient to produce, simple to operate, and produces a soft, light-resistant, matte water-based ink product with stable quality, which is conducive to industrial production.

[0006] The objective of this invention is achieved through the following technical solution: a soft, light-resistant, matte water-based ink, comprising the following raw materials by weight percentage: 35-50% acrylic-modified polyurethane matte emulsion, 30-45% matte light-resistant color paste, 2-7% anti-abrasion matting agent, 0.1-0.5% defoamer, and 8-15% deionized water.

[0007] The preparation method of the acrylic-modified polyurethane matte emulsion includes the following steps:

[0008] A1. By weight, take 10-15 parts of glycerol polyoxyethylene polyoxypropylene ether and dehydrate it under vacuum. After dehydration, cool it and add 20-30 parts of isophorone diisocyanate (IPDI) and add 1-2 drops of dibutyltin dilaurate (DBTL). React at a constant temperature of 62-68℃ for 50-70 minutes to obtain mixture A1.

[0009] A2. After cooling mixture A1 to 45-55℃, add 5-8 parts of dimethylolpropionic acid (DMPA) and 5-8 parts of polyethylene glycol, react at 70-80℃ for 50-70 min, add 3-5 parts of chain extender and continue the reaction for 50-70 min, cool to 40-50℃, add 1-3 parts of hydroxyethyl methacrylate (HEMA) and 1-3 parts of triethylamine to neutralize and react for 12-18 min, then add 50-70 parts of deionized water and stir to self-emulsify for 50-70 min to obtain mixture A2.

[0010] A3. Emulsify 10-15 parts of ethyl methacrylate and 15-20 parts of butyl acrylate with a mixture of 0.5-1 parts of emulsifier and 20-30 parts of water. Add 0.5-1 parts of silane coupling agent to the emulsified mixture of ethyl methacrylate and butyl acrylate and then drop it onto mixture A2 to obtain mixture A3.

[0011] A4. Heat mixture A3 to 65-75℃, add 0.5-1 part initiator and 1-5 parts solvent, react for 100-140 min and keep warm for 35-45 min to obtain acrylic modified polyurethane matte emulsion.

[0012] Furthermore, in step A1, the glycerol polyoxyethylene polyoxypropylene ether is polyether GPE-3000.

[0013] Furthermore, in step A2, the chain extender is hydrazine hydrate. This invention uses hydrazine hydrate as a chain extender, combined with raw materials such as glycerol polyoxyethylene polyoxypropylene ether and isophorone diisocyanate, to prepare an acrylic-modified polyurethane matte emulsion. This allows for better preservation of the microscopic raised spherical structure on the latex film surface, with a more uniform particle size distribution. Hydrated and larger microspheres tend to appear on the film surface, which helps to enhance the microscopic surface roughness and achieve a matte effect.

[0014] Furthermore, in step A3, the emulsifier is isotrimethylene tridecyl alcohol polyoxyethylene ether. This isotrimethylene tridecyl alcohol polyoxyethylene ether is a nonionic emulsifier with a high CMC value, which can increase the emulsion particle size, reduce the gloss of the emulsion coating, and achieve a matte effect. The isotrimethylene tridecyl alcohol polyoxyethylene ether is preferably, but not limited to, TO-6, 7, or 8.

[0015] Furthermore, in step A3, the silane coupling agent is γ-aminopropyltriethoxysilane (APTES). The silane coupling agent γ-aminopropyltriethoxysilane utilizes its hydrolytic condensation properties in water to form larger particles through Si-O-Si aggregation, increasing the average particle size of the emulsion and reducing the gloss of the emulsion coating to achieve a matte finish.

[0016] Furthermore, in step A4, the initiator is initiator APS.

[0017] Furthermore, in step A4, the solvent is cyclohexane. Using cyclohexane as a poor solvent allows for good compatibility with other raw materials, resulting in an uneven surface texture on the latex and enhancing the matting effect.

[0018] Furthermore, the preparation method of the matte, lightfast colorant includes the following steps:

[0019] B1. By weight, mix 30-40 parts of alkali-soluble emulsion with 40-55 parts of water evenly, then add 1-3 parts of monoethanolamine and 2-4 parts of DMEA to form a mixture and 0.1-0.5 parts of defoamer. After mixing, disperse for 20-30 minutes to make the pH 8.8-9.2 to obtain colloidal grinding resin.

[0020] B2. Take 40-50 parts of colloidal grinding resin, 20-30 parts of deionized water, 5-10 parts of kaolin, 15-25 parts of organic lightfast pigment, 0.1-0.5 parts of defoamer, and 1-3 parts of dispersant, mix and disperse for 40-60 minutes, then grind to a fineness of 1-10 μm to obtain matte lightfast pigment.

[0021] Furthermore, in step B1, the defoamer is TEGO Foamex 825; in step B2, the defoamer is TEGO Foamex 810.

[0022] Furthermore, in step B2, the kaolin has a particle size of 1-4 μm and an oil absorption of 45-60 g / 100 g. Due to its high refractive index, kaolin exhibits good color ductility, strong chemical properties, small optic axis angle, and high degree of crystal arrangement order, which can increase the coating's ability to shield against ultraviolet rays, improve its sun resistance, and also assist in matting.

[0023] Further, in step B2, the organic lightfast pigment is at least one of Pigment Blue PB15:3, Pigment Yellow PY150, Pigment Red PR170, or Pigment Black PB7. Specifically, Pigment Blue PB15:3 has a lightfastness rating of 7-8, an oil absorption of 30-45 g / 100 g, and a density of 1.6-1.8 g / cm³. 3 The pigment yellow PY150 has a lightfastness rating of 8, an oil absorption of 35-50 g / 100g, and a density of 1.6-1.8 g / cm³. The pigment red PR170 has a lightfastness rating of 7, an oil absorption of 20-40 g / 100g, and a density of 1.5-1.6 g / cm³. 3 The pigment black PB7 has an oil absorption of 110-130 g / 100 g and a density of 1.0-1.2 g / cm³. 3 .

[0024] Furthermore, in step B2, the dispersant is TEGO Dispers 760W, which helps to wet and disperse organic pigments.

[0025] Furthermore, the anti-abrasion matting agent is polyethylene wax. The polyethylene wax has a melting point of 105-115°C, a pH of 7-9, and a solid content of 40-50%. Preferably, the polyethylene wax is PEW-2001 polyethylene wax, which helps reduce gloss, providing a smooth feel and abrasion resistance.

[0026] Another objective of this invention is achieved through the following technical solution: a method for preparing the above-mentioned soft, lightfast, matte water-based ink, comprising the following steps:

[0027] Add acrylic-modified polyurethane matte emulsion, matte and lightfast color paste, anti-abrasion matting agent, defoamer, and deionized water in proportion, mix all raw materials evenly, and a soft, lightfast, matte water-based ink is prepared.

[0028] Furthermore, the preparation method of the soft, light-resistant matte water-based ink includes the following steps: adding acrylic-modified polyurethane matte emulsion, matte light-resistant color paste, anti-abrasion matting agent, defoamer, and deionized water to a disperser in proportion, the disperser speed is 500-700 r / min, and after dispersing for 20-30 min, the soft, light-resistant matte water-based ink is obtained.

[0029] The beneficial effects of this invention are as follows: the soft, sun-resistant, matte water-based ink of this invention has the softness of imitation leather, does not crack after repeated folding, is sun-resistant and migration-resistant, has excellent tactile properties and low gloss, does not require the addition of powder materials for matting, and has the advantages of non-oxidation of hot stamping and silver stamping, low VOC content, bright colors, good leveling and good printability; the preparation method of the soft, sun-resistant, matte water-based ink is convenient to produce, simple to operate, and conducive to industrial production. Detailed Implementation

[0030] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0031] In a typical embodiment of the present invention, a soft, light-resistant, matte water-based ink comprises the following raw materials in weight percentages: 35-50% acrylic-modified polyurethane matte emulsion, 30-45% matte light-resistant color paste, 2-7% anti-abrasion matting agent, 0.1-0.5% defoamer, and 8-15% deionized water. The defoamer is TEGO Foamex 825.

[0032] The preparation method of the acrylic-modified polyurethane matte emulsion includes the following steps:

[0033] A1. By weight, take 10-15 parts of glycerol polyoxyethylene polyoxypropylene ether and dehydrate it under vacuum for 50-70 minutes at a temperature of 100-105℃. After dehydration, cool it and add 20-30 parts of isophorone diisocyanate (IPDI) and 1-2 drops of dibutyltin dilaurate (DBTL). React at a constant temperature of 62-68℃ for 50-70 minutes to obtain mixture A1.

[0034] A2. After cooling mixture A1 to 45-55℃, add 5-8 parts of dimethylolpropionic acid (DMPA) and 5-8 parts of polyethylene glycol, react at 70-80℃ for 50-70 min, add 3-5 parts of chain extender and continue the reaction for 50-70 min, cool to 40-50℃, add 1-3 parts of hydroxyethyl methacrylate (HEMA) and 1-3 parts of triethylamine to neutralize and react for 12-18 min, then add 50-70 parts of deionized water and stir to self-emulsify for 50-70 min to obtain mixture A2.

[0035] A3. Emulsify 10-15 parts of ethyl methacrylate and 15-20 parts of butyl acrylate with a mixture of 0.5-1 parts of emulsifier and 20-30 parts of water. Add 0.5-1 parts of silane coupling agent to the emulsified mixture of ethyl methacrylate and butyl acrylate and then drop it onto mixture A2 to obtain mixture A3.

[0036] A4. Heat mixture A3 to 65-75℃, add 0.5-1 part initiator and 1-5 parts cyclohexane, react for 100-140 min and keep warm for 35-45 min to obtain acrylic modified polyurethane matte emulsion.

[0037] Furthermore, in step A1, the glycerol polyoxyethylene polyoxypropylene ether is polyether GPE-3000.

[0038] Furthermore, in step A2, the chain extender is hydrazine hydrate.

[0039] Furthermore, in step A3, the emulsifier is isotridecyl alcohol polyoxyethylene ether, and the silane coupling agent is γ-aminopropyltriethoxysilane.

[0040] Furthermore, in step A4, the initiator is initiator APS.

[0041] Furthermore, the preparation method of the matte, lightfast colorant includes the following steps:

[0042] B1. By weight, mix 30-40 parts of alkali-soluble emulsion with 40-55 parts of water evenly, then add 1-3 parts of monoethanolamine and 2-4 parts of DMEA to form a mixture and 0.1-0.5 parts of defoamer. After mixing, disperse for 20-30 minutes to make the pH 8.8-9.2 to obtain colloidal grinding resin.

[0043] B2. Take 40-50 parts of colloidal grinding resin, 20-30 parts of deionized water, 5-10 parts of kaolin, 15-25 parts of organic lightfast pigment, 0.1-0.5 parts of defoamer, and 1-3 parts of dispersant and put them into a disperser. Pre-disperse for 40-60 minutes at a disperser speed of 300-500 r / min. Then grind with a vertical planetary ball mill 3-5 times and grind until the fineness is 1-10 μm to obtain matte lightfast pigment.

[0044] Furthermore, in step B1, the defoamer is TEGO Foamex 825; in step B2, the defoamer is TEGO Foamex 810.

[0045] Furthermore, the alkali-soluble emulsion is YK506 alkali-soluble emulsion. That is, the alkali-soluble emulsion used as the grinding resin is the alkali-soluble emulsion in the Chinese invention patent with authorization announcement number CN101851316B and patent title "An Alkali-Soluble Emulsion and Its Preparation Method and Its Application in Water-Based Inks". It has good dispersibility and good stability after grinding pigments, and at the same time, it has low gloss, which can achieve the purpose of reducing gloss.

[0046] Further, in step B2, the kaolin has a particle size of 1-4 μm and an oil absorption of 45-60 g / 100 g. The organic lightfast pigment is at least one of Pigment Blue PB15:3, Pigment Yellow PY150, Pigment Red PR170, or Pigment Black PB7. Preferably, the organic lightfast pigment is Lily Phthalocyanine Blue 156, Lily Permanent Yellow BH-1501, Lily Permanent Red BH-5RK, or Monarch 700. The dispersant is TEGO Dispers 760W.

[0047] Furthermore, the anti-abrasion matting agent is polyethylene wax. Preferably, the polyethylene wax is PEW-2001 polyethylene wax.

[0048] In a typical embodiment of the present invention, a method for preparing the above-mentioned soft, light-resistant, matte water-based ink includes the following steps: adding acrylic-modified polyurethane matte emulsion, matte light-resistant color paste, anti-abrasion matting agent, defoamer, and deionized water to a disperser in proportion; the disperser speed is 500-700 r / min; and after dispersing for 20-30 min, the soft, light-resistant, matte water-based ink is obtained.

[0049] Example 1

[0050] In this embodiment, a soft, lightfast, matte water-based ink comprises the following raw materials by weight percentage: 48% acrylic-modified polyurethane matte emulsion, 35% matte lightfast color paste, 5% anti-abrasion matting agent, 0.5% defoamer TEGO Foamex 825, and 11.5% deionized water.

[0051] The preparation method of the acrylic-modified polyurethane matte emulsion includes the following steps:

[0052] A1. By weight, add 12 parts of polyether GPE-3000 to a four-necked flask equipped with a stirrer, thermometer and condenser and dehydrate under vacuum for 60 min at 100℃. After dehydration is complete, cool and add 28 parts of isophorone diisocyanate and 2 drops of dibutyltin dilaurate. React at 65℃ for 60 min to obtain mixture A1.

[0053] A2. After cooling mixture A1 to 50°C, add 8 parts of dimethylolpropionic acid and 6 parts of polyethylene glycol, react at 75°C for 60 min, add 3 parts of chain extender hydrazine hydrate and continue the reaction for 60 min, cool to 45°C, add 2 parts of hydroxyethyl methacrylate and 3 parts of triethylamine to neutralize and react for 15 min, then add 60 parts of deionized water and stir to self-emulsify for 60 min to obtain mixture A2.

[0054] A3. Emulsify 13 parts of ethyl methacrylate and 15 parts of butyl acrylate with a mixture of 1 part emulsifier and 25 parts water. Add 0.8 parts of γ-aminopropyltriethoxysilane to the emulsified mixture of ethyl methacrylate and butyl acrylate and then drop it onto mixture A2 to obtain mixture A3.

[0055] A4. Heat mixture A3 to 70°C, add 0.5 parts of initiator APS and 3 parts of cyclohexane, react for 120 min and keep warm for 40 min to obtain acrylic modified polyurethane matte emulsion.

[0056] Furthermore, the preparation method of the matte, lightfast colorant includes the following steps:

[0057] B1. By weight, 35 parts of alkali-soluble emulsion and 50 parts of water are mixed evenly, then 2 parts of monoethanolamine and 4 parts of DMEA are added to form a mixture, and 0.3 parts of defoamer TEGO Foamex 825 are added. After mixing, the mixture is dispersed for 25 minutes to make the pH 8.8-9.2, thus obtaining the colloidal grinding resin.

[0058] B2. Take 45 parts of colloidal grinding resin, 30 parts of deionized water, 10 parts of kaolin, 18 parts of organic lightfast pigment, 0.5 parts of defoamer TEGO Foamex 810, and 3 parts of dispersant and put them into a disperser. Pre-disperse for 50 minutes at a disperser speed of 400 r / min. Then grind 4 times with a vertical planetary ball mill and grind until the fineness is 1-10 μm to obtain matte lightfast pigment.

[0059] Furthermore, in step B1, the alkali-soluble emulsion is the alkali-soluble emulsion prepared in Example 1 of Chinese Invention Patent No. CN101851316B.

[0060] Furthermore, in step B2, the kaolin has a particle size of 1-4 μm and an oil absorption of 45-60 g / 100 g. The organic lightfast pigment is Lily Permanent Yellow BH-1501. The dispersant is TEGO Dispers 760W.

[0061] Furthermore, the anti-abrasion matting agent is PEW-2001 polyethylene wax.

[0062] This embodiment also provides a method for preparing the above-mentioned soft, light-resistant, matte water-based ink, comprising the following steps: adding acrylic-modified polyurethane matte emulsion, matte light-resistant color paste, anti-abrasion matting agent, defoamer, and deionized water to a disperser in proportion; the disperser speed is 600 r / min; and dispersion is carried out for 25 min to obtain the soft, light-resistant, matte water-based ink. The viscosity, pH, matteness, migration resistance, light resistance, hot stamping oxidation resistance, and softness of the obtained soft, light-resistant, matte water-based ink are tested, and it is packaged after passing the tests.

[0063] Example 2

[0064] In this embodiment, a soft, light-resistant, matte water-based ink comprises the following raw materials by weight percentage: 39% acrylic-modified polyurethane matte emulsion, 45% matte light-resistant color paste, 7% anti-abrasion matting agent, 0.3% defoamer, and 8.7% deionized water.

[0065] The preparation method of the acrylic-modified polyurethane matte emulsion includes the following steps:

[0066] A1. By weight, add 12 parts of polyether GPE-3000 to a four-necked flask equipped with a stirrer, thermometer and condenser and dehydrate under vacuum for 60 min at 100℃. After dehydration is complete, cool and add 28 parts of isophorone diisocyanate and 2 drops of dibutyltin dilaurate. React at 65℃ for 60 min to obtain mixture A1.

[0067] A2. After cooling mixture A1 to 50°C, add 7 parts of dimethylolpropionic acid and 6 parts of polyethylene glycol, react at 75°C for 60 min, add 4 parts of chain extender hydrazine hydrate and continue the reaction for 60 min, cool to 45°C, add 3 parts of hydroxyethyl methacrylate and 2 parts of triethylamine to neutralize and react for 15 min, then add 70 parts of deionized water and stir to self-emulsify for 60 min to obtain mixture A2.

[0068] A3. Emulsify 13 parts of ethyl methacrylate and 15 parts of butyl acrylate with a mixture of 1 part emulsifier and 25 parts water. Add 0.8 parts of γ-aminopropyltriethoxysilane to the emulsified mixture of ethyl methacrylate and butyl acrylate and then drop it onto mixture A2 to obtain mixture A3.

[0069] A4. Heat mixture A3 to 70°C, add 0.5 parts of initiator APS and 4 parts of cyclohexane, react for 120 min and keep warm for 40 min to obtain acrylic modified polyurethane matte emulsion.

[0070] Furthermore, the preparation method of the matte, lightfast colorant includes the following steps:

[0071] B1. By weight, 35 parts of alkali-soluble emulsion and 50 parts of water are mixed evenly, then 2 parts of monoethanolamine and 4 parts of DMEA are added to form a mixture and 0.2 parts of defoamer. After mixing, the mixture is dispersed for 25 minutes to make the pH 8.8-9.2, thus obtaining the colloidal grinding resin.

[0072] B2. Take 43 parts of colloidal grinding resin, 29 parts of deionized water, 9 parts of kaolin, 18 parts of organic lightfast pigment, 0.5 parts of defoamer, and 3 parts of dispersant and put them into a disperser. Pre-disperse for 50 minutes at a disperser speed of 400 r / min. Then grind 4 times with a vertical planetary ball mill and grind until the fineness is 1-10 μm to obtain matte lightfast pigment.

[0073] This embodiment also provides a method for preparing the above-mentioned soft, light-resistant, matte water-based ink, comprising the following steps: adding acrylic-modified polyurethane matte emulsion, matte light-resistant color paste, anti-abrasion matting agent, defoamer, and deionized water to a disperser in proportion; the disperser speed is 600 r / min; and dispersion is carried out for 25 min to obtain the soft, light-resistant, matte water-based ink. The viscosity, pH, matteness, migration resistance, light resistance, hot stamping oxidation resistance, and softness of the obtained soft, light-resistant, matte water-based ink are tested, and it is packaged after passing the tests.

[0074] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0075] Example 3

[0076] In this embodiment, a soft, light-resistant, matte water-based ink comprises the following raw materials by weight percentage: 35% acrylic-modified polyurethane matte emulsion, 45% matte light-resistant color paste, 7% anti-abrasion matting agent, 0.1% defoamer, and 12.9% deionized water.

[0077] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0078] Example 4

[0079] In this embodiment, a soft, light-resistant, matte water-based ink comprises the following raw materials by weight percentage: 50% acrylic-modified polyurethane matte emulsion, 35% matte light-resistant color paste, 2% anti-abrasion matting agent, 0.5% defoamer, and 12.5% ​​deionized water.

[0080] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0081] Comparative Example 1

[0082] In this embodiment, a soft, light-resistant, matte water-based ink comprises the following raw materials by weight percentage: 45% commercially available styrene-acrylic emulsion, 3% commercially available matting powder, 35% matte light-resistant color paste, 5% anti-abrasion matting agent, 0.5% defoamer, and 11.5% deionized water.

[0083] The rest of the contents of this comparative example are the same as those of Example 1, and will not be repeated here.

[0084] Comparative Example 2

[0085] In this embodiment, a soft, light-resistant, matte water-based ink comprises the following raw materials by weight percentage: 39% acrylic-modified polyurethane matte emulsion, 45% commercially available water-based colorant, 7% anti-abrasion matting agent, 0.3% defoamer, and 8.7% deionized water.

[0086] The rest of the contents of this comparative example are the same as those of Example 2, and will not be repeated here.

[0087] The component contents of Examples 1-4 and Comparative Examples 1-4 are compared in Table 1 below:

[0088]

[0089] Among them, the commercially available styrene-acrylic emulsion is Joncry 617, the commercially available matting agent is Acematt OK 520, and the commercially available water-based color paste can be one of the four color pastes from the Guangdong Inco HA3 series: HA307 yellow, HA312 blue, and H1# black. The commercially available water-based color paste used in Comparative Example 1 is the Guangdong Inco HA3 series HA307 yellow paste.

[0090] Experimental methods and data determination of experimental results:

[0091] (1) Test method:

[0092] 1. Viscosity: Water-based ink viscosity 10-40s

[0093] According to GB / T 13217.4-2008, the viscosity of liquid inks was tested using a KU-2 viscometer at 25°C for emulsions; and using a 4# Zahn cup at 25°C for pigments and water-based inks.

[0094] 2. pH: 8.0-9.5

[0095] The test was conducted at 25°C using a PHS-3B precision pH meter.

[0096] 3. Sun resistance rating: ≥5

[0097] Lightfastness was evaluated using a xenon arc lamp with a filter for printed matter and printing inks, according to GB / T 22771-2008 Printing Technology. The parameters were set as follows: irradiance 0.5 W / m²; blackboard temperature 45°C; ambient temperature 35°C; humidity 50%; and the test was conducted for 16 hours. Lightfastness was evaluated by finding a level of change similar to that of the test sample in the grade of the blue wool standard sample.

[0098] 4. Migration resistance: Resistant to migration

[0099] The presence of migration can be assessed by coating a sample with solvent-based white ink and observing whether other colors migrate to the surface of the white ink after it dries.

[0100] 5. Gloss: ≤3 degrees

[0101] The test was conducted using a BGD 512 / S gloss meter, according to GB / T 13217.2.

[0102] 6. Softness: It will not burst after being folded repeatedly 10 times.

[0103] Use a 100μm wire to scrape soft, lightfast, matte water-based ink onto white cardstock. After it dries completely, fold the cardstock in half 10 times to observe the cracking of the ink layer.

[0104] 7. Hot stamping with anti-oxidation properties: does not oxidize.

[0105] After the printed sample is hot-stamped with a hot stamping machine, the constant temperature and humidity chamber is set to 85% humidity and 65℃. After the constant temperature and humidity chamber is placed for 3 hours, the gloss of the hot stamping on the printed sample is observed to see if there is oxidation.

[0106] (2) Performance parameters:

[0107] The performance parameters of Examples 1-2 and Comparative Examples 1-2 are shown in Table 2 below:

[0108]

[0109]

[0110] The low-foaming water-based ink prepared by this invention is not prone to foaming, and its pH and viscosity remain relatively stable during long-term printing. It is suitable for various flexographic printing presses for paper printing, especially inline die-cutting flexographic high-speed printing presses.

[0111] The specific embodiments described above are further illustrations of the technical solution and beneficial effects of the present invention, and are not intended to limit the implementation methods. For those skilled in the art, any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A soft, sun-resistant, matte water-based ink, characterized in that: The raw materials include the following weight percentages: 35-50% acrylic modified polyurethane matte emulsion, 30-45% matte and lightfast colorant, 2-7% anti-abrasion matting agent, 0.1-0.5% defoamer, and 8-15% deionized water; The preparation method of the acrylic-modified polyurethane matte emulsion includes the following steps: A1. By weight, take 10-15 parts of glycerol polyoxyethylene polyoxypropylene ether and dehydrate it under vacuum. After dehydration, cool it and add 20-30 parts of isophorone diisocyanate and add 1-2 drops of dibutyltin dilaurate. React at a constant temperature of 62-68℃ for 50-70 minutes to obtain mixture A1. A2. After cooling mixture A1 to 45-55℃, add 5-8 parts of dimethylolpropionic acid (DMPA) and 5-8 parts of polyethylene glycol, react at 70-80℃ for 50-70 min, add 3-5 parts of chain extender and continue the reaction for 50-70 min, cool to 40-50℃, add 1-3 parts of hydroxyethyl methacrylate and 1-3 parts of triethylamine to neutralize and react for 12-18 min, then add 50-70 parts of deionized water and stir to self-emulsify for 50-70 min to obtain mixture A2. A3. Emulsify 10-15 parts of ethyl methacrylate and 15-20 parts of butyl acrylate with a mixture of 0.5-1 parts of emulsifier and 20-30 parts of water. Add 0.5-1 parts of silane coupling agent to the emulsified mixture of ethyl methacrylate and butyl acrylate and then drop it onto mixture A2 to obtain mixture A3. A4. Heat mixture A3 to 65-75℃, add 0.5-1 part initiator and 1-5 parts solvent, react for 100-140 min and keep warm for 35-45 min to obtain acrylic modified polyurethane matte emulsion. In step A2, the chain extender is hydrazine hydrate; The preparation method of the matte, lightfast colorant includes the following steps: B1. By weight, mix 30-40 parts of alkali-soluble emulsion with 40-55 parts of water evenly, then add 1-3 parts of monoethanolamine and 2-4 parts of DMEA to form a mixture and 0.1-0.5 parts of defoamer. After mixing, disperse for 20-30 minutes to make the pH 8.8-9.2 to obtain colloidal grinding resin. B2. Take 40-50 parts of colloidal grinding resin, 20-30 parts of deionized water, 5-10 parts of kaolin, 15-25 parts of organic lightfast pigment, 0.1-0.5 parts of defoamer, and 1-3 parts of dispersant, mix and disperse for 40-60 minutes, then grind to a fineness of 1-10 μm to obtain matte lightfast pigment. The alkali-soluble emulsion is obtained by free radical polymerization of vinyl monomers. The specific raw materials and their weight percentages in the emulsion are as follows: 8-10% hard monomers, 20-30% soft monomers, 1-2% functional monomers, 8-10% unsaturated carboxylic acid monomers, 1-3% chain transfer agent, 2-3% emulsifier, 0.4-0.5% initiator, 0.1-0.4% buffer, and the remainder is deionized water. The hard monomers mentioned above refer to monovinyl monomers with a glass transition temperature higher than 50°C; The soft monomers mentioned above refer to monovinyl monomers with a glass transition temperature below 0°C; The functional monomers mentioned refer to one or two of acrylamide, N-hydroxymethylacrylamide, hydroxyethyl acrylate, hydroxypropyl acrylate, and hydroxyethyl methacrylate; The unsaturated carboxylic acid monomer refers to one or both of acrylic acid and methacrylic acid.

2. The soft, lightfast, matte water-based ink according to claim 1, characterized in that: In step A3, the emulsifier is isotridecyl alcohol polyoxyethylene ether, and the silane coupling agent is γ-aminopropyltriethoxysilane.

3. The soft, lightfast, matte water-based ink according to claim 1, characterized in that: In step A4, the initiator is APS and the solvent is cyclohexane.

4. The soft, lightfast, matte water-based ink according to claim 1, characterized in that: The anti-wear matting agent is polyethylene wax.

5. A method for preparing a soft, lightfast, matte water-based ink as described in any one of claims 1-4, characterized in that: Includes the following steps: Add acrylic-modified polyurethane matte emulsion, matte and lightfast color paste, anti-abrasion matting agent, defoamer, and deionized water in proportion, mix all raw materials evenly, and a soft, lightfast, matte water-based ink is prepared.

6. The method for preparing soft, lightfast, matte water-based ink according to claim 5, characterized in that: Add acrylic-modified polyurethane matte emulsion, matte and lightfast color paste, anti-abrasion matting agent, defoamer, and deionized water to a disperser in proportion. The disperser speed is 500-700 r / min. After dispersing for 20-30 minutes, a soft, lightfast, matte water-based ink is obtained.

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