Water-based UV ink-jet ink and preparation method thereof

Abstract

The invention relates to the technical field of UV ink, and discloses water-based UV ink-jet ink which comprises the following raw materials: 50 parts of resin, 20 parts of dye, 2 parts of glycerol, 1 part of a defoaming agent, 2 parts of diacrylate, 1 part of a pH regulator, 1 part of a viscosity regulator, 50 parts of a diluent, 12 parts of an antioxidant, 20 parts of a light stabilizer and 23 parts of an anti-aggregation agent. The antioxidant is a composition of bisphenol A, butyl hydroxybenzoic acid and tributyl hydroxyphenyl ether, the light stabilizer is one or a combination of more of benzotriazole, benzimidazole and HALS, and the anti-aggregation agent is one or a combination of more of polyvinyl alcohol, polyacrylic acid and polyvinylpyrrolidone. One or more compositions of glycerol, a defoaming agent, a pH regulator and a viscosity regulator are added in the preparation process of the water-based UV ink-jet ink, so that the ink can effectively control foam in the printing process, the stable pH and viscosity are maintained, and the smoothness of the printing process and the stability of the printing quality are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of UV inks, in particular to a water-based UV inkjet ink and a preparation method thereof. Background Art

[0002] With the advancement of science and technology, digital printing technology has become an important part of the modern printing field. Among them, inkjet technology, which we usually call inkjet printing technology, has been widely used. Inkjet printing technology has the advantages of high precision, high speed and low cost. It has been widely used in advertising, labeling, packaging, decoration and other fields.

[0003] Existing water-based UV inkjet inks are prone to foaming during the spraying process, affecting print quality. Furthermore, the ink's physical and chemical properties, such as viscosity and pH, also significantly impact print quality. Furthermore, the ink's antioxidant properties, light resistance, and color stability are also crucial factors affecting its lifespan and print quality. Therefore, a water-based UV inkjet ink and its preparation method are proposed. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a water-based UV inkjet ink and a preparation method thereof, which solves the problem that the existing water-based UV inkjet ink has limitations.

[0005] To achieve the above objectives, the present invention is implemented through the following technical scheme: a water-based UV inkjet ink, which includes the following raw materials in parts by mass: 45-55 parts of resin, 15-25 parts of dye, 1-3 parts of auxiliary agent, 45-55 parts of diluent, 12-20 parts of antioxidant, 15-25 parts of light stabilizer, and 17-23 parts of anti-aggregating agent.

[0006] Preferably, the auxiliary agent is one or more combinations of glycerol, defoaming agent, pH regulator, viscosity regulator, and diacrylate.

[0007] Preferably, the light stabilizer is a combination of benzotriazoles, benzimidazoles, and HALS.

[0008] Preferably, the anti-aggregating agent is one or more combinations of polyvinyl alcohol, polyacrylic acid, and polyvinyl pyrrolidone.

[0009] A method for preparing a water-based UV inkjet ink comprises the following steps:

[0010] S1. Add the resin and diluent into a container according to the mass ratio, and use a stirrer to mix the resin and diluent for a certain period of time until a uniform mixture A is formed;

[0011] S2. Adding additives and antioxidants to mixture A, stirring and dispersing the additives and antioxidants sufficiently, wherein the total mass of the additives and antioxidants added is 1% to 3% of the total mass of mixture A, to obtain mixture B;

[0012] S3. Add dye to mixture B in a ratio of 15% to 25% of the total mass of mixture B, while stirring until the dye is completely dissolved and evenly dispersed in the solution to obtain a preliminary ink material;

[0013] S4. Add light stabilizer and anti-aggregating agent to the ink raw material. The addition ratio of light stabilizer and anti-aggregating agent is 15% to 25% and 17% to 23% of the total mass of the ink raw material. Stir at the same time to fully mix and evenly disperse.

[0014] S5, stirring the mixed ink material at room temperature, and then filtering it through a filter to remove possible impurities and undissolved particles to obtain a finished ink;

[0015] S6. Take out a small portion of the finished ink for inkjet testing, then put the tested finished ink into a clean container and seal it for storage.

[0016] The resin and diluent are stirred at a speed of 1000-1500 rpm for 10-20 min, and the mixture A is stirred at a speed of 800-1000 rpm for 5-15 min.

[0017] The stirring speed of the mixture B is 600-900 rpm, and the stirring time is 15-40 min. The stirring speed of the ink initial material is 500-800 rpm, and the stirring time is 10-35 min.

[0018] In step S5 , the stirring speed of the ink initial material is 400-800 rpm, the stirring time is 0.5h-1h, and the specification of the filter is 0.5μm-0.45μm.

[0019] In step S6, the inkjet test includes: ink jet performance, viscosity and adhesion indicators, the inkjet test distance is 20cm, the jet speed is 50mm / s.

[0020] The present invention provides a water-based UV inkjet ink and a preparation method thereof. It has the following beneficial effects:

[0021] 1. The present invention adds one or more combinations of glycerol, defoaming agent, pH regulator, viscosity regulator, and diacrylate during the preparation process of water-based UV inkjet ink, so that the ink can effectively control foam during the printing process, maintain stable pH and viscosity, and ensure a smooth printing process and stable print quality.

[0022] 2. The present invention adds an antioxidant during the preparation process of the water-based UV inkjet ink, and the light stabilizer is one or more combinations of benzotriazoles, benzimidazoles, and HALS, so that the ink has a longer service life, better light resistance and color stability, as well as better fluidity and uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a flow chart for preparing the aqueous UV inkjet ink of the present invention; DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all 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.

[0025] Example 1:

[0026] An embodiment of the present invention provides a water-based UV inkjet ink comprising the following raw materials: 50 parts resin, 20 parts dye, 2 parts glycerol, 1 part defoamer, 2 parts diacrylate, 1 part pH adjuster, 1 part viscosity adjuster, 50 parts diluent, 12 parts antioxidant, 20 parts light stabilizer, and 23 parts anti-aggregating agent. The antioxidant is a combination of bisphenol A, butylated hydroxybenzoic acid, and tributyl hydroxyphenyl ether; the light stabilizer is a combination of one or more benzotriazoles, benzimidazoles, and HALS; and the anti-aggregating agent is a combination of one or more polyvinyl alcohol, polyacrylic acid, and polyvinyl pyrrolidone. The resin in the water-based UV inkjet ink provides the ink's basic structure and binder. It forms the solid portion of the ink, enabling it to adhere to printed materials. The dye acts as a pigment in the water-based UV inkjet ink, providing the ink's color and ensuring the desired color of the printed image. The glycerol acts as a solvent and humectant in the ink. It helps dissolve other ingredients and improve ink fluidity, while also helping the ink better wet the printed material during printing. The role of the foaming agent is to prevent the formation and accumulation of bubbles in the ink. It can maintain the stability of the ink and spray evenly. Diacrylate is used as an additive and may play a role in adjusting the properties of the ink. pH regulators are used to adjust the acidity and alkalinity of the ink. Viscosity regulators are used to adjust the viscosity of the ink. The role of antioxidants is to prevent the oxidation of the components in the ink.

[0027] The present invention also provides a method for preparing a water-based UV inkjet ink, comprising the following steps:

[0028] S1: 50 parts of resin and 50 parts of diluent were added into a container according to the mass ratio, and stirred at a speed of 1000 rpm for 20 minutes until a uniform mixture A was formed.

[0029] S2: Add 2 parts of glycerol, 1 part of defoaming agent, 1 part of pH regulator, 1 part of viscosity regulator and 12 parts of antioxidant to mixture A and stir at 1000 rpm for 15 minutes until a uniform mixture is formed. Stir thoroughly to ensure uniform dispersion until a uniform mixture B is formed.

[0030] S3: Add 20 parts of dye to mixture N and stir at 800 rpm for 40 min until the dye is completely dissolved and evenly dispersed in the solution to obtain a preliminary ink material.

[0031] S4: Add 20 parts of light stabilizer and 23 parts of anti-aggregating agent to the obtained ink raw material, and stir at a speed of 600 rpm for 35 minutes to ensure sufficient mixing and uniform dispersion.

[0032] S5: After stirring and mixing at room temperature, the ink raw material is obtained, which is then filtered through a 0.5 μm filter to remove impurities and undissolved particles to obtain a finished ink product.

[0033] S7: Take out a small portion of the finished ink for inkjet testing at a jetting distance of 20 cm and a jetting speed of 50 mm / s to observe the jetting performance, viscosity, and adhesion indicators.

[0034] The jetting performance, viscosity, and adhesion of the final ink product are shown in Table 1 below.

[0035] Example 2:

[0036] An embodiment of the present invention provides a water-based UV inkjet ink, comprising the following raw materials: 55 parts of resin, 25 parts of dye, 3 parts of glycerol, 2 parts of defoamer, 1 part of diacrylate, 45 parts of diluent, 15 parts of antioxidant, 15 parts of light stabilizer, and 20 parts of anti-aggregating agent. The auxiliary agent is one or more combinations of glycerol, defoamer, pH regulator, and viscosity regulator; the antioxidant is a combination of bisphenol A, butylated hydroxybenzoic acid, and tributyl hydroxyphenyl ether; the light stabilizer is one or more combinations of benzotriazoles, benzimidazoles, and HALS; and the anti-aggregating agent is one or more combinations of polyvinyl alcohol, polyacrylic acid, and polyvinyl pyrrolidone.

[0037] The present invention also provides a method for preparing a water-based UV inkjet ink, comprising the following steps:

[0038] S1: 55 parts of resin and 45 parts of diluent were added into a container according to the mass ratio, and stirred at a speed of 1500 rpm for 10 minutes until a uniform mixture A was formed.

[0039] S2: Add 3 parts of glycerol, 2 parts of defoaming agent and 15 parts of antioxidant to mixture A, and stir at 1000 rpm for 5 minutes until a uniform mixture B is formed.

[0040] S3: Add 25 parts of dye to mixture B and stir at 900 rpm for 15 minutes until the dye is completely dissolved and evenly dispersed in the solution to obtain a preliminary ink material.

[0041] S4: Add 15 parts of light stabilizer and 20 parts of anti-aggregating agent to the obtained ink raw material, and stir at a speed of 700 rpm for 25 minutes to ensure sufficient mixing and uniform dispersion.

[0042] S5: After stirring and mixing at room temperature, the ink raw material is obtained, and then filtered through a 0.45 μm filter to remove impurities and undissolved particles to obtain a finished ink product.

[0043] S7: Take out a small portion of the finished ink to conduct an inkjet test at a jetting distance of 20 cm and a jetting speed of 50 mm / s to observe the jetting performance, viscosity, and adhesion indicators.

[0044] The jetting performance, viscosity, and adhesion of the final ink product are shown in Table 1 below.

[0045] Example 3:

[0046] An embodiment of the present invention provides a water-based UV inkjet ink, comprising the following raw materials: 45 parts of resin, 15 parts of dye, 1 part of glycerol, 2 parts of defoaming agent, 2 parts of pH regulator, 1 part of viscosity regulator, 55 parts of diluent, 18 parts of antioxidant, 25 parts of light stabilizer, and 17 parts of anti-aggregating agent. The auxiliary agent is one or more combinations of glycerol, defoaming agent, pH regulator, and viscosity regulator; the antioxidant is a combination of bisphenol A, butylated hydroxybenzoic acid, and tributyl hydroxyphenyl ether; the light stabilizer is one or more combinations of benzotriazoles, benzimidazoles, and HALS; and the anti-aggregating agent is one or more combinations of polyvinyl alcohol, polyacrylic acid, and polyvinyl pyrrolidone.

[0047] The present invention also provides a method for preparing a water-based UV inkjet ink, comprising the following steps:

[0048] S1: 45 parts of resin and 55 parts of diluent were added into a container according to the mass ratio, and stirred at a speed of 1000 rpm for 15 minutes until a uniform mixture A was formed.

[0049] S2: Add 1 part of glycerol, 2 parts of defoaming agent, 2 parts of pH regulator, 1 part of viscosity regulator and 18 parts of antioxidant to mixture A, and stir at 800 rpm for 5 minutes until a uniform mixture B is formed.

[0050] S3: Add 15 parts of dye to mixture B and stir at 600 rpm for 30 min until the dye is completely dissolved and evenly dispersed in the solution to obtain a preliminary ink material.

[0051] S4: Add 25 parts of light stabilizer and 17 parts of anti-aggregating agent to the ink mixture and stir at 800 rpm for 10 minutes to ensure thorough mixing and uniform dispersion.

[0052] S5: The mixed ink material is stirred at room temperature, and then filtered through a 0.5 μm filter to remove impurities and undissolved particles to obtain a finished ink product.

[0053] S7: Take out a small portion of the finished ink for inkjet testing at a jetting distance of 20 cm and a jetting speed of 50 mm / s to observe the jetting performance, viscosity, and adhesion indicators.

[0054] The jetting performance, viscosity, and adhesion of the final ink product are shown in Table 1 below.

[0055] Example 4:

[0056] An embodiment of the present invention provides a water-based UV inkjet ink, comprising the following raw materials: 55 parts of resin, 20 parts of dye, 2 parts of glycerol, 1 part of pH regulator, 3 parts of diacrylate, 45 parts of diluent, 15 parts of antioxidant, 15 parts of light stabilizer, and 23 parts of anti-aggregating agent. The auxiliary agent is one or more combinations of glycerol, defoaming agent, pH regulator, and viscosity regulator. The antioxidant is a combination of bisphenol A, butylated hydroxybenzoic acid, and tributyl hydroxyphenyl ether. The light stabilizer is one or more combinations of benzotriazoles, benzimidazoles, and HALS. The anti-aggregating agent is one or more combinations of polyvinyl alcohol, polyacrylic acid, and polyvinyl pyrrolidone.

[0057] The present invention also provides a method for preparing a water-based UV inkjet ink, comprising the following steps:

[0058] S1: 55 parts of resin and 45 parts of diluent were added into a container according to the mass ratio, and stirred at a speed of 1200 rpm for 18 minutes until a uniform mixture A was formed.

[0059] S2: Add 2 parts of glycerol, 1 part of pH regulator and 15 parts of antioxidant to mixture A, and stir at 900 rpm for 5 minutes until a uniform mixture B is formed.

[0060] S3: Add 20 parts of dye to mixture B and stir at 700 rpm for 25 minutes until the dye is completely dissolved and evenly dispersed in the solution to obtain a preliminary ink material.

[0061] S4: Add 15 parts of light stabilizer and 23 parts of anti-aggregating agent to the ink mixture and stir at 500 rpm for 30 minutes to ensure thorough mixing and uniform dispersion.

[0062] S5: The mixed ink material is stirred at room temperature, and then filtered through a 0.45 μm filter to remove impurities and undissolved particles to obtain a finished ink product.

[0063] S7: Take out a small portion of the finished ink for inkjet testing at a jetting distance of 20 cm and a jetting speed of 50 mm / s to observe the jetting performance, viscosity, and adhesion indicators.

[0064] The jetting performance, viscosity, and adhesion of the final ink product are shown in Table 1 below.

[0065] Embodiment 5:

[0066] An embodiment of the present invention provides a water-based UV inkjet ink, comprising the following raw materials: 50 parts of resin, 25 parts of dye, 1 part of glycerol, 1 part of defoaming agent, 1 part of viscosity modifier, 50 parts of diluent, 14 parts of antioxidant, 115 parts of light stabilizer, and 20 parts of anti-aggregating agent. The auxiliary agent is one or more combinations of glycerol, defoaming agent, pH regulator, and viscosity modifier; the antioxidant is a combination of bisphenol A, butylated hydroxybenzoic acid, and tributyl hydroxyphenyl ether; the light stabilizer is one or more combinations of benzotriazoles, benzimidazoles, and HALS; and the anti-aggregating agent is one or more combinations of polyvinyl alcohol, polyacrylic acid, and polyvinyl pyrrolidone.

[0067] The present invention also provides a method for preparing a water-based UV inkjet ink, comprising the following steps:

[0068] S1: 50 parts of resin and 50 parts of diluent were added into a container according to the mass ratio, and stirred at a speed of 1300 rpm for 12 minutes until a uniform mixture A was formed.

[0069] S2: Add 1 part of glycerol, 1 part of defoaming agent, 1 part of viscosity regulator and 14 parts of antioxidant to mixture A, and stir at 800 rpm for 10 minutes until a uniform mixture B is formed.

[0070] S3: Add 25 parts of dye to mixture B and stir at 900 rpm for 20 min until the dye is completely dissolved and evenly dispersed in the solution to obtain a preliminary ink material.

[0071] S4: Add 15 parts of light stabilizer and 20 parts of anti-aggregating agent to the ink mixture, stir at 800 rpm for 15 minutes to ensure thorough mixing and uniform dispersion.

[0072] S5: The mixed ink material is stirred at room temperature, and then filtered through a 0.5 μm filter to remove impurities and undissolved particles to obtain a finished ink product.

[0073] S7: Take out a small portion of the finished ink for inkjet testing at a jetting distance of 20 cm and a jetting speed of 50 mm / s to observe the jetting performance, viscosity, and adhesion indicators.

[0074] The jetting performance, viscosity, and adhesion of the final ink product are shown in Table 1 below.

[0075] Comparative Example 1:

[0076] Traditional solvent-based inkjet ink preparation steps:

[0077] S1. Mix resin, dye, solvent and other raw materials in a certain proportion.

[0078] S2. Use a blender to mix the ingredients until a uniform mixture is formed.

[0079] S3. Filter the mixture to remove impurities and undissolved particles.

[0080] S4. Put the ink into a container and seal it for storage.

[0081] Comparative Example 2:

[0082] Preparation steps of solvent-based UV inkjet ink:

[0083] S1. Mix resin, dye, solvent and other raw materials in a certain proportion.

[0084] S2. Use a blender to mix the ingredients until a uniform mixture is formed.

[0085] S3. Add light stabilizer, anti-aggregating agent and other additives and stir evenly.

[0086] S4. Filter the mixture to remove impurities and undissolved particles.

[0087] S5. Put the ink into a container and seal it for storage.

[0088] Comparative Example 3:

[0089] Preparation steps of water-based dye ink:

[0090] S1. Add appropriate amount of dye powder to a certain proportion of water.

[0091] S2. Use a blender to mix the dye and water until the dye is completely dissolved and evenly dispersed in the water.

[0092] S3. Add additives, stabilizers and other formula ingredients, and adjust and optimize as needed to improve the performance and stability of the ink.

[0093] S4. Continue stirring to ensure that all ingredients are evenly dispersed in the water.

[0094] S5. Filter the mixture to remove impurities and undissolved particles.

[0095] S6. Take out a small amount of ink for inkjet test and observe the ink's jetting performance, color saturation, drying speed and other indicators.

[0096] S7. Place the tested ink into a clean container, seal it tightly, and keep it away from light and high temperature to maintain the stability of the ink.

[0097] Table 1: Comprehensive parameter measurement table of water-based UV inkjet inks prepared in Examples 1 to 5

[0098] Jetting performance Viscosity Pa·s Adhesion N Example 1 high 4.2 7.2 Example 2 medium 3.6 6.8 Example 3 high 4.1 7.3 Example 4 Higher 3.9 7.0 Example 5 medium 3.7 6.9

[0099] The following will further introduce the effects of the present invention in conjunction with comparative experiments:

[0100] Comparative experiment:

[0101] The following steps are involved:

[0102] S1. Prepare the same type of inkjet printer and inkjet head.

[0103] S2. Printing tests were performed using water-based UV inkjet ink, solvent-based inkjet ink, solvent-based UV inkjet ink, and water-based dye ink, respectively, to print the same images and text.

[0104] S3. Measure the adhesion, light resistance, and water resistance of the printed results.

[0105] S4. Compare the print clarity, drying speed, and color stability of the four inks, as shown in Table 2 below.

[0106] Table 2: Performance measurement table of water-based UV inkjet ink provided in Examples 1 to 5 of the present invention

[0107]

[0108] Conclusion: According to the comparative experimental results, water-based UV inkjet ink shows several significant advantages over traditional solvent-based inkjet ink. First, it has excellent adhesion and can provide reliable adhesion performance on various material surfaces. Second, water-based UV inkjet ink also exhibits excellent light resistance and water resistance, allowing printed products to remain stable outdoors and in humid environments.

[0109] In addition, the water-based UV inkjet ink provided in Examples 1 to 5 of the present invention can provide bright and stable color effects, so that images and texts maintain clear and full color performance. Finally, the water-based UV inkjet ink dries quickly, which improves production efficiency and reduces the blurring problem caused by the ink not drying. In summary, the water-based UV inkjet ink is a more environmentally friendly and high-quality ink choice, which is suitable for various printing needs.

[0110] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A water-based UV inkjet ink, characterized in that: The composition comprises the following raw materials in parts by mass: 45-55 parts of resin, 15-25 parts of dye, 1-3 parts of auxiliary agent, 45-55 parts of diluent, 12-20 parts of antioxidant, 15-25 parts of light stabilizer and 17-23 parts of anti-aggregating agent.

2. The aqueous UV inkjet ink according to claim 1, characterized in that: The auxiliary agent is one or more combinations of glycerol, defoaming agent, pH regulator, viscosity regulator and diacrylate.

3. The aqueous UV inkjet ink according to claim 1, characterized in that: The antioxidants are bisphenol A, butylated hydroxybenzoic acid and tributyl hydroxyphenyl ether.

4. The aqueous UV inkjet ink according to claim 1, characterized in that: The light stabilizer is one or more combinations of benzotriazoles, benzimidazoles, and HALS.

5. The aqueous UV inkjet ink according to claim 1, characterized in that: The anti-aggregation agent is one or more combinations of polyvinyl alcohol, polyacrylic acid, and polyvinyl pyrrolidone.

6. A method for preparing a water-based UV inkjet ink, applied to a water-based UV inkjet ink according to claims 1-5, characterized in that: Includes the following methods: S1. Add the resin and diluent into a container according to the mass ratio, and use a stirrer to mix the resin and diluent for a certain period of time until a uniform mixture A is formed; S2. Adding additives and antioxidants to mixture A, stirring and dispersing the additives and antioxidants sufficiently, wherein the total mass of the additives and antioxidants added is 1% to 3% of the total mass of mixture A, to obtain mixture B; S3. Add dye to mixture B in a ratio of 15% to 25% of the total mass of mixture B, while stirring until the dye is completely dissolved and evenly dispersed in the solution to obtain a preliminary ink material; S4. Add light stabilizer and anti-aggregating agent to the ink pre-mix, the addition ratio of light stabilizer and anti-aggregating agent is 15% to 25% and 17% to 23% of the total mass of the ink pre-mix, and stir at the same time to fully mix and evenly disperse; S5, stirring the mixed ink material at room temperature, and then filtering it through a filter to remove possible impurities and undissolved particles to obtain a finished ink; S6. Take out a small portion of the finished ink for inkjet testing, then put the tested finished ink into a clean container and seal it for storage.

7. The method for preparing a water-based UV inkjet ink according to claim 6, wherein: The resin and diluent are stirred at a speed of 1000-1500 rpm for 10-20 min, and the mixture A is stirred at a speed of 800-1000 rpm for 5-15 min.

8. The method for preparing a water-based UV inkjet ink according to claim 6, wherein: The mixture B is stirred at a speed of 600 to 900 rpm for a time of 15 to 40 minutes, and the initial ink material is stirred at a speed of 500 to 800 rpm for a time of 10 to 35 minutes.

9. The method for preparing a water-based UV inkjet ink according to claim 6, wherein: In step S5 , the stirring speed of the ink initial material is 400-800 rpm, the stirring time is 0.5h-1h, and the specification of the filter is 0.5μm-0.45μm.

10. The method for preparing a water-based UV inkjet ink according to claim 6, wherein: In step S6, the inkjet test includes: ink jetting performance, viscosity and adhesion indicators. The distance of the inkjet test is 20 cm and the jetting speed is 50 mm / s.

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