Water-based color ink with strong scraping resistance as well as preparation method and application of water-based color ink

Abstract

The invention relates to water-based color ink with strong scraping resistance as well as a preparation method and application of the water-based color ink. The water-based color ink comprises the following components in parts by mass: 10-20 parts of pigment; 30-50 parts of a water-based binder; 30 to 40 parts of a solvent; 2-5 parts of an auxiliary agent; wherein the water-based binder is mixed resin of water-based acrylic resin, aliphatic polyisocyanate and polycarbodiimide; the solvent is a mixed solution of absolute ethyl alcohol and water; the auxiliary agent comprises the following secondary components in parts by mass: 0.5-1.5 parts of a defoaming agent; 0.5-2 parts of a leveling agent; 1-3 parts of a dispersant; 0.5 to 1.5 parts of an anti-scraping agent; and 0.2 to 0.8 part of a surfactant. Compared with the prior art, the water-based color ink disclosed by the invention has excellent drying performance and scratch resistance on non-absorbing substrates such as light pillar paper and the like. The production process of the water-based color ink is simple, easy to operate and low in production cost, and can be used for large-scale industrial production.

Description

Technical Field

[0001] The invention relates to the field of printing technology, in particular to a water-based color ink with strong scratch resistance and a preparation method and application thereof. Background Art

[0002] Pigments give ink color characteristics and meet the color requirements of printing. General organic pigments and inorganic pigments can be used in water-based inks. Since the resins of water-based inks are mostly alkali-soluble, when selecting pigments, alkali-resistant pigments must be used. However, the distribution density of pigments in water-based inks is much greater than that of solvent-based inks, and the surface tension and polarity of water are very different from those of solvents, making it difficult to disperse pigments, which directly affects the stability, viscosity, pH value and other properties of the ink.

[0003] In the gravure printing process, water-based inks often have a relatively large tension, which causes the ink to not bond firmly with the paper, especially for non-absorbent substrates. Therefore, UV inks or ester-soluble inks are usually used on non-absorbent substrates such as glossy paper to ensure the ink's scratch resistance, which undoubtedly increases the workload. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of existing water-based inks, such as high tension leading to poor scratch resistance of the inks on paper, and thus to provide a water-based ink with strong scratch resistance and a preparation method and application thereof.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] One of the technical solutions of the present invention is to provide a water-based color ink with strong scratch resistance, comprising the following components in parts by weight:

[0007] Pigment 10-20 parts;

[0008] 30-50 parts of water-based binder;

[0009] 30-40 parts of solvent;

[0010] 2-5 parts of additives;

[0011] Wherein, the water-based connecting material is a mixed resin of water-based acrylic resin, aliphatic polyisocyanate and polycarbodiimide;

[0012] The solvent is a mixed solution of anhydrous ethanol and water;

[0013] The auxiliary agent includes the following subcomponents in parts by weight:

[0014] Defoaming agent 0.5-1.5 parts;

[0015] Leveling agent 0.5-2 parts;

[0016] Dispersant 0.2-0.5 parts;

[0017] Anti-scratch agent 0.5-1.5 parts;

[0018] Surfactant 0.2-0.8 parts.

[0019] Among them, the water-based acrylic resin in the water-based binder is mainly a high-molecular acrylic resin synthesized with methyl methacrylate, butyl acrylate, hydroxyethyl acrylate and acrylic acid monomer as raw materials, which has the advantages of high solid content and fast film formation speed.

[0020] Polycarbodiimide in water-based binders mainly exists as a cross-linking agent, which can improve the adhesion of inks on special substrates.

[0021] The aliphatic polyisocyanate in the water-based binder is preferably one with excellent hydrophilicity, which can improve the adhesion while also improving the wear resistance and weather resistance.

[0022] In some specific embodiments, the water-based binder is a mixture of water-based acrylic resin, aliphatic polyisocyanate and polycarbodiimide in a mass ratio of 8:1:1.

[0023] In some specific embodiments, the solvent is a mixture of anhydrous ethanol and water in a mass ratio of 4:1.

[0024] In some specific embodiments, the defoaming agent is polydimethylsiloxane, the leveling agent is modified acrylic acid, the dispersant is oleic acid amide, the anti-scratch agent is wax emulsion, and the surfactant is disodium dodecylbenzene sulfonate.

[0025] A second technical solution of the present invention is to provide a method for preparing a water-based ink having scratch resistance as described in one of the above technical solutions, comprising the following steps:

[0026] S1. Pigment dissolution: Mix the color and solvent, sieve, and obtain a color paste with low fineness;

[0027] S2, mixing the color paste obtained in step S1 with a water-based acrylic resin, a surfactant, a defoamer, and a leveling agent, and grinding to obtain a semi-finished color ink;

[0028] S3, adding dispersant, aliphatic polyisocyanate and polycarbodiimide to the semi-finished ink, mixing, grinding, adding anti-scratch agent, adding pH adjuster to adjust pH to alkaline, filtering to obtain water-based ink with excellent scratch resistance.

[0029] In some specific embodiments, in step S1, the mesh number of the sieve is 200 meshes.

[0030] In some specific embodiments, in step S2, the powder is ground to a fineness of less than 10 μm.

[0031] In some specific embodiments, in step S3, the powder is ground to a fineness of less than 5 μm.

[0032] In some specific embodiments, in step S3, the pH is adjusted to 8-9.

[0033] The pH adjuster is preferably aqueous ammonia having a concentration of 5% g / mL.

[0034] The third technical solution of the present invention is to provide an application of a water-based ink with excellent scratch resistance as described in one of the above technical solutions, wherein the water-based ink can be used for printing on non-absorbent substrates, especially on non-absorbent substrates such as optical column paper.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) The present invention selects a water-based acrylic resin with a high solid content and a fast film formation speed as the main binder, so that the ink can dry quickly during high-speed printing. On a non-absorbent substrate, the fast film formation speed also means improved adhesion. In addition, by adding an appropriate amount of hydrophilic aliphatic polyisocyanate, the adhesion can be further improved while improving the wear resistance and weather resistance. Finally, polycarbodiimide is added as a cross-linking agent, which can effectively cross-link the components together, improve the stability of the ink, and also improve the adhesion and scratch resistance of the ink. By using a surfactant to adjust the tension between the pigment, solvent and resin, the tension of each component inside the water-based ink is matched, and a water-based ink with excellent printing performance is obtained.

[0037] (2) The water-based ink of the present invention has excellent drying performance on non-absorbent substrates such as light column paper, and can be completely dried at 120°C, and the drying speed is relatively fast. It is VOC-free ("YC 263-2008 Limits of Volatile Organic Compounds in Cigarette Rods and Box Wrapping Paper"), and the use of the water-based ink of the present invention is more environmentally friendly.

[0038] (3) The water-based ink of the present invention has uniform color distribution, uniform ink particle size, good combination of pigment and resin, good leveling, and accurate hue (GB T 13217.1-2009 Liquid Ink Color Test Method).

[0039] (3) The water-based ink of the present invention has significant advantages in terms of wide application range and excellent scratch resistance. When the printing speed reaches 170-200 m / min, there will still be no problems such as color flocs and color spots (normal production and printing can be carried out). In addition, the production process of the water-based ink of the present invention is simple, easy to operate, and has low production cost, and can be used for large-scale industrial production. DETAILED DESCRIPTION

[0040] The present invention is described in detail below in conjunction with specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0041] In the following examples and comparative examples, unless otherwise specified, raw materials or processing techniques are conventional commercially available raw materials or conventional processing techniques in the art.

[0042] Water-based acrylic resin: Huber Ink (Shenzhen) Co., Ltd. (Huber)

[0043] Aliphatic polyisocyanate: Huber Ink (Shenzhen) Co., Ltd. (Huber)

[0044] Modified acrylic acid: BYK Additives (Shanghai) Co., Ltd. (BYK)

[0045] Disodium dodecylbenzenesulfonate: BYK Additives (Shanghai) Co., Ltd. (BYK)

[0046] Embodiment 1:

[0047] A water-based color ink with strong scratch resistance is prepared by the following components in parts by mass:

[0048] Pigment 15 parts;

[0049] 43 parts of water-based binder;

[0050] 38 parts of solvent;

[0051] 4 parts of additives;

[0052] The water-based binder is a mixture of water-based acrylic resin, aliphatic polyisocyanate and polycarbodiimide in a mass ratio of 8:1:1.

[0053] The solvent is a mixed solution of anhydrous ethanol and water in a mass ratio of 4:1.

[0054] The additive is composed of the following subcomponents in parts by mass: 0.5 parts of polydimethylsiloxane defoamer, 1 part of modified acrylic leveling agent, 0.5 parts of oleic acid amide dispersant, 0.5 parts of disodium dodecylbenzene sulfonate surfactant, and 1 part of wax emulsion anti-scratch agent.

[0055] The method for preparing the above-mentioned water-based color ink with strong scratch resistance comprises the following steps:

[0056] (1) Pigment dissolution: Mix the pigment and solvent evenly, stir at high speed for about 1 hour at room temperature, with a rotation speed of 1200 rpm to obtain a dissolved color paste, and filter through a 200-mesh filter to obtain a color paste with lower fineness.

[0057] (2) Pre-dispersion of ingredients: the color paste filtered in step (1) is mixed with water-based propionic acid resin, stirred at high speed, and then a surfactant, a defoamer and a leveling agent are added. After mixing, the mixture is ground to a fineness of less than 10 μm to obtain a semi-finished color ink;

[0058] (3) ink reprocessing: the semi-finished ink obtained in step (2) is dispersed by adding a dispersant, and then polycarbodiimide and aliphatic polyisocyanate are added. After mixing evenly, the mixture is ground to a fineness of less than 5 μm, and an anti-scratch agent is added. Then, a pH adjuster (5% g / mL ammonia water) is added to adjust the pH value to about 8.5, and the mixture is dispersed by stirring and filtered to obtain a water-based ink having scratch resistance.

[0059] The prepared water-based ink was subjected to performance tests:

[0060] The color ink is coated or coated on different substrates with an RK machine, and the basic properties of the ink are tested at room temperature. The results are shown in Table 1:

[0061] Table 1 Performance of water-based ink in Example 1

[0062] Substrate Drying time Adhesion Scratch resistant Lightfast Heat resistant White cardboard 30-40s ≥95％ 200 times 5 130℃ Light beam aluminum cardboard 45-60s ≥90％ 150 times 5 130℃

[0063] Comparative Example 1:

[0064] Compared with Example 1, most of the contents are the same, except that the content of the polycarbodiimide resin is reduced and the same amount of water-based acrylic resin is added.

[0065] The water-based ink is prepared by the following components in parts by mass:

[0066] Pigment 15 parts;

[0067] 43 parts of water-based binder;

[0068] 38 parts of solvent;

[0069] 4 parts of additives;

[0070] The water-based binder is a mixture of water-based acrylic resin, aliphatic polyisocyanate and polycarbodiimide in a mass ratio of 8.5:1:0.5.

[0071] The solvent is a mixed solution of anhydrous ethanol and water in a mass ratio of 4:1.

[0072] The additive is composed of the following subcomponents in parts by mass: 0.5 parts of polydimethylsiloxane defoamer, 1 part of modified acrylic leveling agent, 0.5 parts of oleic acid amide dispersant, 0.5 parts of disodium dodecylbenzene sulfonate surfactant, and 1 part of wax emulsion anti-scratch agent.

[0073] The method for preparing the above-mentioned water-based color ink with strong scratch resistance comprises the following steps:

[0074] (1) Pigment dissolution: Mix the pigment and solvent evenly, stir at high speed for about 1 hour at room temperature, with a rotation speed of 1200 rpm-1500 rpm, to obtain a dissolved color paste, and filter through a 200-mesh filter to obtain a color paste with lower fineness.

[0075] (2) Pre-dispersion of ingredients: the color paste filtered in step (1) is mixed with water-based propionic acid resin, stirred at high speed, and then a surfactant, a defoamer and a leveling agent are added. After mixing, the mixture is ground to a fineness of less than 10 μm to obtain a semi-finished color ink;

[0076] (3) Ink reprocessing: After the semi-finished ink obtained in step (2) is dispersed by adding a dispersant, a diimide and an aliphatic polyisocyanate are added, mixed evenly, and ground to a fineness of <5 μm. Then, a pH adjuster (5% g / mL ammonia water) is added to adjust the pH value to about 8.5, and the mixture is dispersed by stirring and filtered to obtain a water-based ink.

[0077] The prepared water-based ink was subjected to performance tests:

[0078] The color ink is coated or coated on different substrates with an RK machine, and the basic properties of the ink are tested at room temperature. The results are shown in Table 2:

[0079] Table 2 Performance of water-based ink in comparative example 1

[0080] Substrate Drying time Adhesion Scratch resistant Lightfast Heat resistant White cardboard 40-50s ≥92％ 160 times 5 130℃ Light beam aluminum cardboard 55-65s ≥88％ 120 times 5 130℃

[0081] Compared with Example 1, the content of polycarbodiimide in the resin is reduced. Polycarbodiimide mainly plays the role of a cross-linking agent in the ink, cross-linking the water-based acrylic resin and the aliphatic polyisocyanate to form a stable structure, which helps to improve the adhesion and scratch resistance of the water-based ink. In this comparative example, due to the reduction of the cross-linking agent, it can be seen that the scratch resistance times are significantly reduced and the adhesion fastness is also reduced.

[0082] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A water-based ink with strong scratch resistance, characterized in that: The composition includes the following components in parts by weight: Pigment 10-20 parts; 30-50 parts of water-based binder; 30-40 parts of solvent; 2-5 parts of additives; Wherein, the water-based connecting material is a mixed resin of water-based acrylic resin, aliphatic polyisocyanate and polycarbodiimide; The solvent is a mixed solution of anhydrous ethanol and water; The auxiliary agent includes the following subcomponents in parts by weight: Defoaming agent 0.5-1.5 parts; Leveling agent 0.5-2 parts; 1-3 parts of dispersant; Anti-scratch agent 0.5-1.5 parts; Surfactant 0.2-0.8 parts.

2. The water-based ink with strong scratch resistance according to claim 1, characterized in that: The water-based binder is prepared by mixing water-based acrylic resin, aliphatic polyisocyanate and polycarbodiimide in a mass ratio of 8:1:

1.

3. The water-based ink with strong scratch resistance according to claim 1, characterized in that: The solvent is a mixture of anhydrous ethanol and water in a mass ratio of 4:

1.

4. The water-based ink with strong scratch resistance according to claim 1, characterized in that: The defoaming agent is polydimethylsiloxane, the leveling agent is modified acrylic acid, the dispersant is oleic acid amide, the anti-scratch agent is wax emulsion, and the surfactant is disodium dodecylbenzene sulfonate.

5. A method for preparing a water-based ink having strong scratch resistance according to any one of claims 1 to 4, characterized in that: The steps include: S1. Pigment dissolution: Mix the color and solvent, sieve, and obtain a color paste with low fineness; S2, mixing the color paste obtained in step S1 with a water-based acrylic resin, a surfactant, a defoamer, and a leveling agent, and grinding to obtain a semi-finished color ink; S3, adding dispersant, aliphatic polyisocyanate and polycarbodiimide to the semi-finished ink, mixing, grinding, adding anti-scratch agent, adding pH adjuster to adjust pH to alkaline, filtering to obtain water-based ink with strong scratch resistance.

6. The water-based ink with strong scratch resistance according to claim 5, characterized in that: In step S1, the mesh number of the sieve is 200 meshes.

7. The water-based ink with strong scratch resistance according to claim 5, characterized in that: In step S2, the powder is ground to a fineness of less than 10 μm.

8. The water-based ink with strong scratch resistance according to claim 5, characterized in that: In step S3, the powder is ground to a fineness of less than 5 μm.

9. The water-based ink with strong scratch resistance according to claim 5, characterized in that: In step S3, the pH is adjusted to 8-9.

10. A use of the water-based ink with strong scratch resistance as claimed in any one of claims 1 to 4, characterized in that: The water-based ink is used for printing on non-absorbent substrates.