Ultra-wide-color-gamut water-based pigment ink as well as preparation method and application thereof

Abstract

The invention discloses an ultra-wide color gamut water-based pigment ink, and a preparation method and application thereof, the ultra-wide color gamut water-based pigment ink comprises the following components by weight: 10-20% of a humectant 1, 5-15% of a humectant 2, 4-8% of a wetting agent, 10-20% of a water-based polyurethane emulsion, 0.5-2% of an acetylene glycol surfactant, 0.1-1% of a silicone oil-containing surfactant, 0.3-2% of a pH regulator, 0.1-1% of a bactericide, 0.1-10% of a viscosity regulator, and 10-20% of a coloring agent. 10 to 20% of deionized water; the ultra-wide-color-gamut water-based pigment ink is prepared from the humectant 1, the humectant 2, the wetting agent, the water-based polyurethane emulsion, the acetylene glycol surfactant, the silicone oil-containing surfactant, the PH regulator, the bactericide, the viscosity regulator, the coloring agent and the deionized water, can be directly jet-printed on the surface of coated paper, and has the advantages of high fineness, high color gamut and the like. The four-color digital jet printing ink has the characteristics of good adhesion, wear resistance and friction resistance, and is superior to traditional four-color digital jet printing.

Description

Technical Field

[0001] The present invention relates to the technical field of pigment inks, and in particular to an ultra-wide color gamut water-based pigment ink, a preparation method, and applications thereof. Background Art

[0002] Coated paper is commonly known as "Coated Paper" or "Art Paper" internationally. It is a high-quality printing paper that has been specially treated. The smooth and flat surface of coated paper gives it a high gloss and appearance. The high whiteness of coated paper means high color reproduction. As a printing substrate, it can make the colors of images appear more full, realistic, and natural. Product brochures printed with coated paper are more exquisite and have a high-end texture.

[0003] As the most anticipated and popular advanced technology in the printing industry, digital inkjet technology uses a computer-controlled printing system to print water-based pigment ink directly onto the surface of coated paper, eliminating the plate-making process, achieving high production efficiency and pollution-free production.

[0004] However, water-based ink has weak adsorption capacity and cannot be absorbed by the surface of coated paper. A large amount of ink must be used during printing to show the dark parts of the image and text. The dark parts will also contain a lot of water. A large amount of water in the coated paper will cause arching and curling. The volatilization of water is also a high-energy and time-consuming process. Graphic prints that are not dried in time cannot be stacked or stacked, otherwise they will stick to the plate, and the inability to quickly collect the materials will lead to low efficiency. Therefore, the present application proposes an ultra-wide color gamut water-based pigment ink and its preparation method and application. Summary of the Invention

[0005] The purpose of the present invention is to provide an ultra-wide color gamut water-based pigment ink and its preparation method and application, so as to solve the problems raised in the above background technology.

[0006] According to a first aspect of the present invention, there is provided an ultra-wide color gamut water-based pigment ink, comprising the following components in percentage by weight: Moisturizer 1 10-20%, Moisturizer 2 5-15%, Wetting agent 4-8%, Water-based polyurethane emulsion 10-20%, Acetylene glycol surfactant 0.5-2%, Silicone oil-containing surfactant 0.1-1%, pH regulator 0.3-2%, Bactericide 0.1-1%, Viscosity regulator 0.1-10%, Colorant 10-20%, Deionized water 10-20%.

[0007] According to an embodiment of the present invention, the moisturizing agent 1 and the moisturizing agent 2 are one or more of ethylene glycol, propylene glycol, diethylene glycol, glycerol, and 1,5-pentanediol, and are added to the ink so that the ink can still remain moist on the nozzle surface when exposed to the air to avoid clogging. High-boiling-point, low-volatile polyols are usually selected. Excessive use of the moisturizing agent makes it difficult to dry on coated paper, and too little use can easily cause the ink to evaporate too quickly, affecting printing smoothness.

[0008] According to an embodiment of the present invention, the wetting agent is one of diethylene glycol butyl ether and triethylene glycol butyl ether, which is added to the ink to make the HLB value of the ink more balanced and enhance the stability and miscibility of the system. High-boiling point, low-volatile alcohol ethers are usually selected to adjust the drying speed of the ink and affect the wettability of coated paper.

[0009] According to an embodiment of the present invention, the water-based polyurethane emulsion includes but is not limited to one of Esajet200, Esajet 400, Esajet AC20, Esajet AC31, Esajet PU77, and Esajet D12 produced by Italian company Lamberti, which is added to the ink so that the ink can adhere to the surface of the coated paper. The selected resin should be easy to form a film and form a tough film structure so that the pigment particles are embedded between the coated paper and the film layer and are protected, so that the picture has wet rubbing fastness, wear resistance, and moderate gloss.

[0010] According to an embodiment of the present invention, acetylene glycol surfactants include but are not limited to: one of S 440 S 465 of Evonik TEGO / Original Air Chemical of Germany, which is added to the ink to reduce the dynamic surface tension of the ink. Digital printing requires faster and faster speeds, and the flow rate of ink in the capillary channel in the nozzle is also faster and faster. High-frequency oscillations also require lower dynamic surface tension.

[0011] According to an embodiment of the present invention, silicone oil-containing surfactants include but are not limited to one of BYK-345, BYK-348 and BYK-349 from German BYK Chemicals. When added to the ink, the surface tension of the ink is adjusted to 20-40 mN / m to meet the nozzle's requirements for the surface tension of high-speed flowing microfluids. The low-surface-tension inkjet ink has better wetting properties on coated paper and can enhance the color expression of the ink.

[0012] According to an embodiment of the present invention, the pH regulator is one of monoethanolamine, diethanolamine, and triethanolamine, which is added to the ink to maintain the ink in a pH environment with good stability. There are many metals or metal-containing materials inside the nozzle, and weak alkalinity helps to protect the metal materials.

[0013] According to an embodiment of the present invention, the fungicide is a benzisothiazolinone fungicide, specifically GXL from a Spanish company, which is added to the ink to keep the ink from being affected by microorganisms within its shelf life.

[0014] According to an embodiment of the present invention, the viscosity regulator is one of polyethylene glycol 800, polyethylene glycol 1000, polyethylene glycol 1200, polyvinyl pyrrolidone K40, and hydroxyethyl cellulose, which is added to the ink to adjust the viscosity of the ink to adapt to the injection viscosity of various nozzles.

[0015] According to an embodiment of the present invention, the colorant includes but is not limited to the cyan D71C / 15:3, D75C / 15:3, the pink D71M / pb122, D75M / pb122, the yellow D71Y / 74y, D75Y / 74y of the British Diamond Color Paste Company under Lubrizol. , D71Y155 / 155y, red D71R / pr177, D71V19 / pv19, purple D71B / pv23, black D77K / pb7, D80K / pb7; Shanghai Yunling self-dispersed nano color paste cyan C00, blue C400, C500, red PV19, PR254, V400, V500, pink, pink M400, M500, purple PV23, orange O64 green G36, black K400, K500, K560, Zhuhai Dongyang Color Material nano color paste red PV19, PR254, magenta PB122, purple PV19, blue 60, orange O64 green G36, are added to the ink to form a variety of bright colors.

[0016] According to an embodiment of the present invention, the conductivity of the deionized water is less than 2000 μs / cm, and more preferably less than 300 μs / cm.

[0017] According to a second aspect of the present invention, there is provided a method for preparing the above-mentioned ultra-wide color gamut water-based pigment ink, comprising the following steps: Step 1: add moisturizer 1, moisturizer 2, wetting agent, viscosity regulator and part of deionized water to a stirred tank in sequence, stir for 10-20 minutes until completely mixed, then heat to 40-45°C and let stand for 2 hours; Step 2: Then, add acetylene glycol surfactant, silicone oil surfactant, pH regulator and fungicide to the stirred tank in sequence and stir for 5-10 minutes until completely dissolved; Step 3: Then add the aqueous polyurethane emulsion, colorant and remaining deionized water to the stirred tank in sequence, stir for 30-60 minutes until completely dissolved, and then let it stand for 12 hours; Step 4: Filter through a filter element to obtain an ultra-wide color gamut water-based pigment ink.

[0018] Among them, the filtration through the filter element filter is specifically: using Hangzhou Kebet’s melt-blown PP mixed glass fiber microporous filter element to perform four-level filtration of 5μm, 3μm, 1μm, and 0.5μm.

[0019] According to an embodiment of the present invention, at 25° C., the Brookfield viscosity of the ultra-wide color gamut water-based pigment ink is 3.5-4.5 mPa·s centipoise, and the surface tension is 27-35 mN / m dyne.

[0020] According to a third aspect of the present invention, there is provided a use of the ultra-wide color gamut water-based pigment ink as described above in inkjet printing on a coated paper surface.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The present invention prepares an ultra-wide color gamut water-based pigment ink by using a moisturizer 1, a moisturizer 2, a wetting agent, an aqueous polyurethane emulsion, an acetylene glycol surfactant, a silicone oil surfactant, a pH regulator, a bactericide, a viscosity regulator, a colorant and deionized water. The ultra-wide color gamut water-based pigment ink can be directly spray-printed on the surface of coated paper and has the characteristics of high fineness, good adhesion, wear resistance and abrasion resistance, thereby surpassing traditional four-color digital printing. DETAILED DESCRIPTION

[0022] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0023] Extended Gamut Guide (EGA) printing in traditional offset printing is a new development in overprinting technology. It uses seven base inks (CMYK + OGV) to simulate 1,729 Pantone colors, expanding the color gamut by three more colors: orange, green, and violet. This results in a 90% increase in color gamut compared to four-color CMYK overprinting, and is closer to Pantone colors. Designers and brand promoters using the EGA Guide for logos and packaging create more vivid colors that are closer to Pantone's gamut. Different printers also choose six-color Pantone printing methods: Hexachrome Pantone Fluorescent Red / Fluorescent Yellow. Seven-color printing (C+M+Y+K+R+G+B) uses cyan, magenta, yellow, and black to complement red, green, and blue. Nine-color printing (C+M+Y+K+R+G+B+O+V) uses cyan, magenta, yellow, and black to complement red, green, blue, orange, and violet. Currently, digital inkjet printers for water-based coated paper all use six-color printing (C+M+Y+K+O+G) to achieve the desired color. Cyan, magenta, yellow, black + orange + green, up to 8 colors printing C + M + Y + K + R + B + Lm + Lc cyan, magenta, yellow, black supplement red + blue + light magenta + light cyan ink scheme, the invention of ultra-wide color gamut water-based pigment ink references the wide color gamut printing scheme and takes the lead in using C + M + Y + K + R + G + B + O + V + Lm + Lc + PK, in addition to the four colors of cyan, magenta, yellow, black, it also provides red R + green G + blue B + orange O + purple V five special colors and light magenta + light cyan + photo black for a total of 12 colors, with the industry's top RIP software IneDit (Spain), traditional printing In this way, ultra-wide color gamut printing can be formed. The added RGB+OV five-color inks can be mixed with CMYK+LmLcPK four-primary color inks to achieve a wider color gamut and more vivid color performance. The specially treated ink formula makes the color of the picture more vivid and saturated. The introduction of the spot color channel improves the transparency and glossiness of the ink layer, thereby improving the printing accuracy and fineness, which can exceed the sRGB color gamut and approach the AdobeRGB wide color gamut, making the digital printing quality of coated paper reach and even surpass the vivid colors of traditional offset printing.

[0024] Example 1 In this embodiment, different aqueous polyurethane emulsions are selected, and the remaining components are the same, as shown in the following table: In the table, OK means the test passed; NG means the test failed.

[0025] As can be seen from the table above, based on the test results of drying speed, adhesion, wet rub fastness, inkjet fluency, and standby moisturizing, the combination of Esajet-200 15% + Esajet-AC20 3% and Esajet-200 15% + Esajet-AC31 3% of the waterborne polyurethane emulsion has the best effect.

[0026] Example 2 In this embodiment, different colorants are selected (the basic colors C is cyan and Y is yellow), and the other components are the same, as shown in the following table: In the table, OK means the test passed; NG means the test failed.

[0027] As can be seen from the above table, based on the color Lab value, glossiness, gradient color performance, spectrophotometry value and standby moisturizing test results, the colorants selected from Shanghai Yunling's self-dispersed nano-color paste, C300 and Y155, are the best.

[0028] Example 3 In this embodiment, different colorants are selected (the base color M magenta K black), and the other components are the same, as shown in the following table: In the table, OK means the test passed; NG means the test failed.

[0029] As can be seen from the above table, based on the color Lab value, glossiness, gradient color performance, spectrophotometry value and standby moisturizing test results, the colorant selected is Shanghai Yunling self-dispersing nano color paste product M400, and black K400 has the best effect.

[0030] Example 4 In this embodiment, different colorants (red and orange) are selected, and the remaining components are the same, as shown in the following table: In the table, OK means the test passed; NG means the test failed.

[0031] As can be seen from the above table, based on the color Lab value, glossiness, gradient color performance, spectrophotometry value and standby moisturizing test results, the colorants selected as Shanghai Yunling self-dispersed nano color paste Red PR254 and Toyo Orange O64 have the best effects.

[0032] Example 5 In this embodiment, different colorants are selected (purple, green, and black), and the remaining components are the same, as shown in the following table: In the table, OK means the test passed; NG means the test failed.

[0033] As can be seen from the above table, based on the color Lab value, glossiness, gradient color performance, spectrophotometry value and standby moisturizing test results, the colorants D71PV23 purple, G36 green Toyo, and Shanghai Yunling self-dispersed nano color paste K560 black Yunling have the best effects.

[0034] In summary, the aqueous polyurethane emulsion used in this application is a combination of Esajet-200 15% + Esajet-AC20 3% or a combination of Esajet-200 15% + Esajet-AC31 3%; The cyan colorant is selected from the cyan C300 of Shanghai Yunling self-dispersed nano-colorant; the yellow colorant is selected from the yellow Y155 of Shanghai Yunling self-dispersed nano-colorant; the purple colorant is selected from the purple M400 of Shanghai Yunling self-dispersed nano-colorant; the black colorant is selected from the black K400 of Shanghai Yunling self-dispersed nano-colorant; the red colorant is selected from the red PR254 of Shanghai Yunling self-dispersed nano-colorant; the orange colorant is selected from the orange O64 of Zhuhai Dongyang Color Material Nano-colorant; the green colorant is selected from the green G36 of Zhuhai Dongyang Color Material Nano-colorant; the purple colorant is selected from the purple D71PV23 of Diamond Color Material Company; the extra black colorant is selected from the black K560 of Shanghai Yunling self-dispersed nano-colorant; the blue colorant is selected from the blue 60 of Zhuhai Dongyang Color Material Nano-colorant; the light cyan colorant is selected from the cyan C400 of Shanghai Yunling self-dispersed nano-colorant; and the light purple colorant is selected from the red V400 of Shanghai Yunling self-dispersed nano-colorant.

[0035] Experimental example After the ink is prepared, it is directly sprayed onto the coated paper through a large-format inkjet printing device to form the required pattern; The light fastness of ink was measured according to the method of “Printing Technology - Evaluation of Light Fastness of Printed Matter and Printing Inks Using Filtered Xenon Arc Lamp” (GB / T 22771-2008); After the above-mentioned ink was subjected to a 3-hour freezing and heating test, it was stored at room temperature for 3 hours. The fluidity of the ink was then compared with that of an ink that had not been subjected to the heating and freezing test to observe whether the ink had gelled or coarsened, thereby determining the ink's stability. Based on the difference in fluidity between the test ink and the control ink, it was determined that the ink prepared in this application had the following characteristics: the fluidity after the test did not change significantly compared to before the test, indicating that the ink was stable; From this, it can be seen that the ink prepared in this application has good stability.

[0036] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. An ultra-wide color gamut water-based pigment ink, characterized in that: According to weight percentage, it is composed of the following ingredients: Moisturizer 1 10-20%, Moisturizer 2 5-15%, Wetting agent 4-8%, Water-based polyurethane emulsion 10-20%, Acetylene glycol surfactant 0.5-2%, Silicone oil-containing surfactant 0.1-1%, pH regulator 0.3-2%, Bactericide 0.1-1%, Viscosity regulator 0.1-10%, Colorant 10-20%, Deionized water 10-20%.

2. The ultra-wide color gamut water-based pigment ink according to claim 1, characterized in that: The moisturizing agent 1 and the moisturizing agent 2 are one or more of ethylene glycol, propylene glycol, diethylene glycol, glycerol, and 1,5-pentanediol.

3. The ultra-wide color gamut water-based pigment ink according to claim 1, characterized in that: The wetting agent is one of diethylene glycol butyl ether and triethylene glycol butyl ether.

4. The ultra-wide color gamut water-based pigment ink according to claim 1, characterized in that: The pH regulator is one of monoethanolamine, diethanolamine and triethanolamine.

5. The ultra-wide color gamut water-based pigment ink according to claim 1, characterized in that: The fungicide is a benzisothiazolinone fungicide.

6. The ultra-wide color gamut water-based pigment ink according to claim 1, characterized in that: The viscosity regulator is one of polyethylene glycol 800, polyethylene glycol 1000, polyethylene glycol 1200, polyvinyl pyrrolidone K40, and hydroxyethyl cellulose.

7. The ultra-wide color gamut water-based pigment ink according to claim 1, characterized in that: The conductivity of the deionized water is less than 2000 μs / cm.

8. A method for preparing an ultra-wide color gamut water-based pigment ink according to claims 1-7, characterized in that: The following steps are involved: Step 1: add moisturizer 1, moisturizer 2, wetting agent, viscosity regulator and part of deionized water to a stirred tank in sequence, stir for 10-20 minutes until completely mixed, then heat to 40-45°C and let stand for 2 hours; Step 2: Then, add acetylene glycol surfactant, silicone oil surfactant, pH regulator and fungicide to the stirred tank in sequence and stir for 5-10 minutes until completely dissolved; Step 3: Then add the aqueous polyurethane emulsion, colorant and the remaining deionized water to the stirred tank in sequence, stir for 30-60 minutes until completely dissolved, and then let it stand for 12 hours; Step 4: Filter through a filter element to obtain an ultra-wide color gamut water-based pigment ink.

9. The method for preparing an ultra-wide color gamut water-based pigment ink according to claim 8, wherein: At 25°C, the Brookfield viscosity of the ultra-wide color gamut water-based pigment ink is 3.5-4.5 mPa.s centipoise and the surface tension is 27-35 mN / m dyne.

10. Use of the ultra-wide color gamut water-based pigment ink according to claims 1 to 7 in inkjet printing on coated paper.

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