High-color-fastness emerald blue ink and preparation method thereof

Abstract

The invention relates to high-color-fastness emerald blue ink and a preparation method thereof. The emerald blue ink is prepared from the following raw materials in percentage by mass: 20 to 30 percent of color paste, 20 to 30 percent of glycerol, 5 to 10 percent of waterborne polyurethane, 3 to 6 percent of closed curing agent, 1.5 to 2.5 percent of surfactant, 0.1 to 0.3 percent of bactericide and the balance of deionized water, wherein the color paste is prepared from the following raw materials in percentage by mass: 20 to 25 percent of disperse blue 60, 10 to 15 percent of glycerol, 5 to 10 percent of sodium lignin sulfonate, 4 to 8 percent of styrene-maleic acid copolymer, 4 to 8 percent of acrylic resin, 5 to 10 percent of C12-14 secondary alcohol polyoxyethylene ether, 0.1 to 0.3 percent of bactericide and the balance of deionized water. The color of the ink is fresh and beautiful turquoise blue, the color fastness of the ink is high, and the ink has good market application prospects.

Description

Technical Field

[0001] This invention relates to the field of spot color ink technology, and in particular to a high color fastness turquoise ink and its preparation method. Background Technology

[0002] In the modern printing industry, color reproduction primarily relies on two techniques: four-color printing (CMYK) and spot color printing. Four-color printing simulates various colors by layering four basic inks: cyan, magenta, yellow, and key / black. Although this technique can meet most color printing needs, its color gamut is limited and cannot cover all colors visible to the human eye, especially some highly saturated and vivid colors.

[0003] Spot color printing is a widely adopted technique to overcome the aforementioned color gamut limitations. Spot color inks are pre-mixed, precisely formulated inks of specific colors, used as independent color plates during printing. Because their colors lie outside the CMYK color gamut, spot colors can produce extremely vibrant and bright colors or colors with special visual effects (such as metallic and fluorescent colors) that cannot be achieved with four-color overprinting. Therefore, they are indispensable in high-end packaging, brand logos, fashion product catalogs, and other fields where color consistency and visual effects are extremely important.

[0004] Vivid Cyan (or Emerald Green) is a highly saturated, vibrant blue-green spot color with a striking visual effect, widely used in luxury packaging and advertising. To achieve this unique color characteristic, traditional Vivid Cyan spot color ink formulations have specific requirements for their components. Typically, its coloring system relies on phthalocyanine blue pigments (such as Phthalocyanine Blue BGS or PB15:3) as a base, compounded with yellow or green pigments with specific structures (such as Phthalocyanine Green PG7, nickel complex yellow, etc.) for hue adjustment, thereby creating the desired vibrant Vivid Cyan hue. In addition, the ink also contains binder resin, solvent, dispersant, and other functional additives.

[0005] However, through long-term practice, the inventors discovered a significant defect in existing turquoise spot color inks: poor color fastness. Specifically, printed materials are prone to color changes or fading due to external environmental factors during subsequent use and storage, mainly due to contact with humid environments and color fading after washing. This seriously affects the aesthetics and lifespan of the product.

[0006] Therefore, how to significantly improve the colorfastness, especially the water resistance, of the turquoise spot color ink while ensuring its bright and eye-catching hue is an urgent problem to be solved. Summary of the Invention

[0007] The purpose of this invention is to overcome the problem of poor color fastness of existing turquoise spot color inks and to provide a turquoise ink with high color fastness and its preparation method.

[0008] The inventors believe that the main reason for the color fastness problem of the turquoise spot color ink is that when printed materials come into contact with water or are subjected to physical friction, the color components in the ink may migrate or fall off, resulting in blurred images or color fading. The root cause lies in the limitations of the chemical stability of the high-saturation organic pigment combination required to achieve the special turquoise hue, as well as the insufficient compatibility and fixation degree between the pigment and the binder system.

[0009] Therefore, this invention selected Disperse Blue 60 as the main coloring agent, and combined it with other additives to achieve the turquoise blue color effect. To solve the problem of color components easily detaching from the turquoise blue spot color ink, this invention adds water-based polyurethane and a sealing and curing agent to the ink, significantly improving the ink's wash fastness rating, thus completing this invention.

[0010] The specific plan is as follows: A high color fastness turquoise ink, wherein the turquoise ink is composed of the following raw materials by weight percentage: 20-30% color paste, 20-30% glycerin, 5-10% waterborne polyurethane, 3-6% blocking curing agent, 1.5-2.5% surfactant, 0.1-0.3% bactericide, and the balance being deionized water; The pigment paste is composed of the following raw materials by mass percentage: 20-25% Disperse Blue 60, 10-15% glycerin, 5-10% sodium lignosulfonate, 4-8% styrene-maleic acid copolymer, 4-8% acrylic resin, 5-10% C12-14 secondary alcohol polyoxyethylene ether, 0.1-0.3% bactericide, and the balance being deionized water.

[0011] Furthermore, in the ink, the polyurethane is of type Acure502, and the sealing curing agent is a water-based sealing polyisocyanate crosslinking agent, type Acure5140.

[0012] Furthermore, in the ink, the surfactant is emulsifier MOA-15 ​​and / or emulsifier MOA-20.

[0013] Furthermore, in the color paste, the styrene-maleic acid copolymer is POLYSCOPE SMA powder 1000P or 2000P.

[0014] Furthermore, in the color paste, the acrylic resin is a water-based acrylic resin liquid, model BASFJONCRYL678.

[0015] Furthermore, the turquoise ink is composed of the following raw materials by mass percentage: 25-30% color paste, 20-25% glycerin, 6-10% waterborne polyurethane, 4-6% sealing and curing agent, 1.5-2.5% surfactant, 0.1-0.3% bactericide, and the balance being deionized water.

[0016] Furthermore, the color paste is composed of the following raw materials by mass percentage: 20-25% Disperse Blue 60, 10-15% glycerin, 5-7% sodium lignosulfonate, 5-8% styrene-maleic acid copolymer, 5-8% acrylic resin, 6-10% C12-14 secondary alcohol polyoxyethylene ether, 0.1-0.3% bactericide, and the balance being deionized water.

[0017] The present invention also protects the preparation method of the high color fastness turquoise ink, comprising: (1) color paste preparation: mixing each raw material and stirring evenly, filtering to remove impurities, collecting the filtrate and grinding to obtain the color paste; (2) ink preparation: mixing the color paste and the remaining raw materials and stirring evenly, centrifuging and filtering to obtain ink.

[0018] Furthermore, in the ink preparation, the filter uses a pleated filter element with a pore size of 2~3μm, the filtration flow rate is controlled at 1~1.5 kg / min, and the filtration pressure is not higher than 0.2 MPa.

[0019] This invention also protects the application of the high color fastness turquoise ink in the printing field.

[0020] Beneficial effects: The high color fastness turquoise ink provided by this invention solves the problem of low color fastness to water washing, dry and wet rubbing of the pigments required for spot colors, which fails to meet customer needs. This invention increases color fastness to level 5 by adding water-based polyurethane and a curing agent, thus meeting customer requirements. Detailed Implementation

[0021] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Where specific techniques or conditions are not specified in the embodiments, they are performed in accordance with techniques or conditions described in the literature in the art or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all commercially available conventional products. In the following embodiments, unless otherwise explicitly stated, "%" refers to weight percentage.

[0022] The following raw materials were used: Styrene-maleic acid copolymer was POLYSCOPE SMA powder 1000P or 2000P from the Netherlands, with similar effects. The acrylic resin was a waterborne acrylic resin liquid produced by BASF, model BASFJONCRYL678. Emulsifiers MOA-15 ​​and MOA-20 were produced by Jiangsu Haian Petrochemical. The waterborne polyurethane was Acure 502 from Shanghai Yuanhe Chemical. The blocking curing agent was Acure 5140 waterborne blocked polyisocyanate crosslinking agent from Shanghai Yuanhe Chemical.

[0023] Examples 1-4 A highly stable turquoise ink, the raw materials of which are shown in Tables 1 and 2.

[0024] The main steps in the preparation of ink are as follows: (1) Preparation of pigment paste Preparation: Clean the dispersion tank and the grinder, and add an appropriate amount of zirconium beads to the grinder (the amount depends on the material type and process requirements).

[0025] Weigh the raw materials according to the corresponding percentages in Table 1, place the material bucket directly under the stirring rod, fix the dispersion bucket, start the mixer, adjust the speed to 800–1000 r / min, and stir until the materials are evenly mixed to obtain a dispersion.

[0026] The dispersion was filtered to remove impurities, and then iron impurities were removed by magnetic attraction.

[0027] Move the dispersion tank next to the grinder, connect the discharge port to the booster pump, and place a filter rack and a 100-mesh filter bag on another clean material tank. Turn on the booster pump to slowly pump the dispersion into the filter bag and collect the filtrate.

[0028] After collecting the filtrate, continue stirring to prevent sedimentation. Connect the outlet of the material tank to the inlet of the diaphragm pump of the grinder, adjust the speed of the grinder to 800 r / min, control the feed flow rate, and stir while feeding to ensure that all materials are ground once in the grinder to obtain the color paste.

[0029] (2) Ink preparation Weigh out the color paste and other ink ingredients according to the proportions in Table 2, mix them, and stir evenly to obtain a mixture.

[0030] The mixture was centrifuged at 15,000 r / min, and the discharge flow rate was controlled at 0.6 ± 0.03 kg / min by a peristaltic pump.

[0031] Collect the centrifuged liquid and filter it using a 3μm pleated filter cartridge. Control the filtration flow rate to about 1.5 kg / min and the filtration pressure to no more than 0.2 MPa to obtain spot color ink.

[0032] (3) Color quality inspection Color calibration and comparison: Take an appropriate amount of the prepared spot color ink sample and measure its color using a spectrophotometer or colorimeter. Compare the measured spectral data or Lab value with the color sample value provided by the customer to confirm whether the color effect meets the requirements.

[0033] Table 1. Composition of Pigment Paste / Percentage by Mass

[0034] Table 2 Ink Composition Table / Mass Percentage

[0035] Comparative Example 1 Referring to Example 1, the difference is that instead of using Disperse Blue 60 in the color paste, an equal mass of Disperse Blue 359 is used.

[0036] Comparative Example 2 Referring to Example 1, the difference is that water-based polyurethane is not added to the ink, but instead an equal mass of water is used.

[0037] Comparative Example 3 Referring to Example 1, the difference is that no sealing curing agent is added to the ink; instead, an equal mass of water is used.

[0038] Performance testing The prepared ink sample was heat-transfer printed onto the fabric sample, and then the fabric sample was sent to the testing institution for testing using the color fastness to storage transfer (AATCC TM 163-2013, Method 2).

[0039] Table 3. Results of Color and Colorfastness Tests

[0040] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0041] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0042] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A high-color-fastness turquoise ink, characterized in that: The turquoise ink is composed of the following raw materials by weight percentage: 20-30% color paste, 20-30% glycerin, 5-10% waterborne polyurethane, 3-6% sealing and curing agent, 1.5-2.5% surfactant, 0.1-0.3% bactericide, and the balance being deionized water; The pigment paste is composed of the following raw materials by mass percentage: 20-25% Disperse Blue 60, 10-15% glycerin, 5-10% sodium lignosulfonate, 4-8% styrene-maleic acid copolymer, 4-8% acrylic resin, 5-10% C12-14 secondary alcohol polyoxyethylene ether, 0.1-0.3% bactericide, and the balance being deionized water.

2. The high color fastness turquoise ink according to claim 1, characterized in that: In the ink, the polyurethane is of type Acure502, and the sealing curing agent is a water-based sealed polyisocyanate crosslinking agent, type Acure5140.

3. The high color fastness turquoise ink according to claim 1, characterized in that: In the ink, the surfactant is emulsifier MOA-15 ​​and / or emulsifier MOA-20.

4. The high color fastness turquoise ink according to claim 1, characterized in that: In the color paste, the styrene-maleic acid copolymer is POLYSCOPE SMA powder 1000P or 2000P.

5. The high color fastness turquoise ink according to claim 1, characterized in that: The acrylic resin in the color paste is a water-based acrylic resin liquid, model BASF JONCRYL678.

6. The high colorfastness turquoise ink according to any one of claims 1-5, characterized in that: The turquoise ink is composed of the following raw materials by mass percentage: 25-30% color paste, 20-25% glycerin, 6-10% waterborne polyurethane, 4-6% sealing and curing agent, 1.5-2.5% surfactant, 0.1-0.3% bactericide, and the balance being deionized water.

7. The high colorfastness turquoise ink according to any one of claims 1-5, characterized in that: The color paste is composed of the following raw materials by mass percentage: 20-25% Disperse Blue 60, 10-15% glycerin, 5-7% sodium lignosulfonate, 5-8% styrene-maleic acid copolymer, 5-8% acrylic resin, 6-10% C12-14 secondary alcohol polyoxyethylene ether, 0.1-0.3% bactericide, and the balance being deionized water.

8. A method for preparing the high color fastness turquoise ink according to any one of claims 1-7, characterized in that: include: (1) Preparation of color paste: Mix all raw materials and stir evenly, filter to remove impurities, collect the filtrate and grind it to obtain the color paste; (2) Ink preparation: Mix the pigment and the remaining raw materials, stir evenly, centrifuge and filter to obtain ink.

9. The method for preparing the high color fastness turquoise ink according to claim 8, characterized in that: In the ink preparation, a pleated filter element with a pore size of 2~3μm is used for filtration, the filtration flow rate is controlled at 1~1.5 kg / min, and the filtration pressure is not higher than 0.2 MPa.

10. The application of the high color fastness turquoise ink according to any one of claims 1-7 in the printing field.

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