High-hardness UV ink and coating method thereof

Abstract

The invention discloses a high-hardness UV ink and a coating method thereof, and the method comprises the following steps: S1, transparent gloss oil coating: coating a layer of low-temperature colorless gloss oil on a transparent substrate, and then heating to cure the gloss oil; and S2, high-hardness UV printing ink coating: coating the cured transparent gloss oil with the high-hardness UV printing ink, pressing the UV printing ink with a patterned PET film, then curing with an LED lamp, and finally heating and baking. According to the coating method of the high-hardness UV ink provided by the invention, the colorless gloss oil provides a carrier for the ink, so that the ink is more wear-resistant, the hardness of the ink coating is improved, and the problems that the existing UV ink coating is poor in adhesive force and not ideal in hardness are solved; the coating prepared by the high-hardness UV ink coating method has the characteristics that the adhesive force reaches 0 grade, the hardness reaches 7H or above, the coating is resistant to high temperature of 200 DEG C for 15 minutes without changing, and the coating is resistant to electrolyte soaking for 24 hours without changing.

Description

Technical Field

[0001] The invention relates to the field of coatings, in particular to a high-hardness UV ink and a coating method thereof. Background Art

[0002] UV ink is a photosensitive composite material. Under the action of various ultraviolet light, the oligomers, active diluents, photoinitiator TPO, etc. in the ink are polymerized and cross-linked instantly to complete the curing. It is an environmentally friendly, efficient, energy-saving and economical printing product. UV ink can be used in printing, coating, coating, bonding, anti-counterfeiting labels and other fields. It has good applicability and can meet the printing needs of different substrates.

[0003] Under the action of ultraviolet light, transparent glass can effectively cure the coating of UV ink. Generally, UV ink coating is suitable for transparent and flat substrates, which can be optically transparent and meet the needs of anti-counterfeiting labeling of optical materials. In flatbed printing, UV printing ink is mainly used in high-end products due to its excellent characteristics such as fast curing speed, non-volatility and no pollution. It is mainly used in screen printing of smart terminals such as mobile phone touch screens and smart phone touch screens for decoration and protection.

[0004] With the increasing demand for smart display screens, the glass cover printing market is currently in short supply, and high-end brands are no longer using traditional transparent glass cover plates. However, as people demand, glass cover plates are increasingly developing towards high wear resistance, high transparency, high strength, high hardness, and high wear resistance. New materials are needed to meet the performance requirements of wear resistance, high hardness, high hardness, and high light transmittance.

[0005] However, after UV ink is printed on general glass cover plates, the surface coating is ink, which has low hardness, poor wear resistance, poor scratch resistance, and poor abrasion resistance, and cannot meet the printing requirements of high-end transparent glass cover plates. In addition, the UV ink layer after coating has poor wear resistance, short service life, and cannot be reused. Although there are relevant UV ink coating methods in the industry, they cannot meet the requirements of high hardness, high wear resistance, and scratch resistance. After printing, the coating UV ink layer has poor adhesion to the glass base layer, poor wear resistance, poor scratch resistance, and thin coating thickness, which cannot meet the printing requirements of high-end glass cover plates. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a high-hardness UV ink that can be printed on the surface of a glass cover plate, has good wear resistance, high coating thickness, high hardness, good scratch resistance, good performance and long service life.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A high-hardness UV ink coating method comprises the following steps: S1: Transparent varnish coating: coating a layer of low-temperature colorless varnish on the transparent substrate, and then heating it to solidify it; S2: High hardness UV ink coating: Use high hardness UV ink to coat the cured transparent varnish, press the textured PET film on the UV ink, then cure it with LED lamp, and finally heat and bake.

[0008] Furthermore, the low-temperature colorless varnish is composed of component 1 and component 2 in a weight ratio of 85-95:5-15; wherein, Component 1 is composed of the following raw materials by weight percentage: Polyester resin 90~95% Hydrophobic fumed silica 1~8% Defoamer 0.1~1% Silane coupling agent 1~5% Component 2 is a curing agent.

[0009] Furthermore, in step S1, the coating thickness is 5-10 μm.

[0010] Furthermore, the high hardness UV ink is composed of the following raw materials by weight percentage: PHEA monomer (2-phenoxyethyl acrylate monomer) 10~30% HDDA monomer (1,6-hexanediol diacrylate monomer) 25~35% IBOA monomer (isobornyl acrylate monomer) 10~30% Solid acrylic resin 25~35% Photoinitiator TPO 1%~2%.

[0011] Furthermore, in step S2, the thickness of the UV ink is 10-15 μm.

[0012] Furthermore, in step S1, heating to cure means heating and curing by infrared rays, with a curing temperature of 100-150° C. and a curing time of 3-10 minutes.

[0013] Furthermore, in step S2, the wavelength of the LED lamp is 395 nm, and the curing energy of the LED lamp is 300-500 joules.

[0014] Furthermore, the silane coupling agent is selected from Dow Corning silane coupling agent OFS-6040\6020\6011\6032.

[0015] A high-hardness UV ink coating method is prepared by the above-mentioned high-hardness UV ink coating method.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention provides a high-hardness UV ink coating method, which realizes that colorless varnish provides a carrier for the ink, makes the ink more wear-resistant, improves the hardness of the ink coating, and solves the problems of poor adhesion and unsatisfactory hardness of the existing UV ink coating. The coating prepared by the high-hardness UV ink coating method has the characteristics of adhesion reaching level 0, hardness reaching above 7H, resistance to high temperature of 200°C without discoloration for 15 minutes, resistance to electrolyte immersion for 24 hours without change, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a coating prepared in Example 1 of the present invention; Figure 2 This is a schematic diagram of a coating prepared in Example 2 of the present invention; Figure 3 This is a schematic diagram of a coating prepared in Example 3 of the present invention; Figure 4 This is a schematic diagram of the coating prepared in Example 4 of the present invention. DETAILED DESCRIPTION

[0018] For ease of understanding of the application, the application will be described more fully below. The application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the application more thorough and comprehensive.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0022] In this application, when it comes to numerical ranges, unless otherwise specified, the above numerical ranges are deemed to be continuous and include the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0023] The percentage contents involved in this application, unless otherwise specified, refer to mass percentage for solid-liquid mixing and solid-solid mixing, and refer to volume percentage for liquid-liquid mixing.

[0024] The percentage concentrations mentioned in this application, unless otherwise specified, refer to the final concentration, which refers to the percentage of the added component in the system after the addition of the component.

[0025] The temperature parameters in this application, unless otherwise specified, allow for both constant temperature treatment and treatment within a certain temperature range. The constant temperature treatment allows the temperature to fluctuate within the accuracy range of instrument control.

[0026] The "particles" mentioned in this application, or materials with a defined particle size distribution, are not necessarily spherical in shape, but may be irregular, primary particles or secondary particles. The particle size of irregular particles is the average of their maximum diameter and minimum diameter.

[0027] Embodiment 1 A high hardness UV ink coating method comprises the following steps: S1: Transparent varnish coating: a layer of low-temperature colorless varnish is coated on the transparent substrate with a coating thickness of 5 μm, and then heated and cured by infrared rays at a curing temperature of 120°C and a curing time of 5 minutes; The low-temperature colorless varnish is composed of component 1 and component 2 in a weight ratio of 90:10; wherein component 1 is composed of the following raw materials in weight percentage: Polyester resin 90% Hydrophobic fumed silica 8% Defoaming agent 0.1% Dow Corning silane coupling agent OFS-6040 1.9% Component 2 is a curing agent; 3390 S2: High hardness UV ink coating: High hardness UV ink is coated on the cured transparent varnish, the thickness of the UV ink is 10~15μm, and a textured PET film is pressed on the UV ink and then cured with an LED lamp, the wavelength of the LED lamp is 395nm, the LED lamp curing energy is 400 joules, and finally further heated and cured by infrared rays, the curing temperature is 120℃, and the curing time is 5min; the obtained coating, such as Figure 1 As shown; The high hardness UV ink is composed of the following raw materials by weight percentage: PHEA monomer (2-phenoxyethyl acrylate monomer) 20% HDDA monomer (1,6-hexanediol diacrylate monomer) 30% IBOA monomer (isobornyl acrylate monomer) 24% Solid acrylic resin 25% Photoinitiator TPO 1%; The high-hardness UV ink preparation method is as follows: firstly, PHEA monomer, HDDA monomer, IBOA monomer and solid acrylic resin are dispersed in a disperser at 3000 revolutions for 120 minutes, then filtered through 200 meshes, and then a photoinitiator TPO is added for dispersion.

[0028] Embodiment 2 A high hardness UV ink coating method comprises the following steps: S1: Transparent varnish coating: a layer of low-temperature colorless varnish is coated on the transparent substrate with a coating thickness of 8 μm, and then heated and cured by infrared rays at a curing temperature of 130°C and a curing time of 8 minutes; The low-temperature colorless varnish is composed of component 1 and component 2 in a weight ratio of 85:15; wherein component 1 is composed of the following raw materials in weight percentage: Polyester resin 92% Hydrophobic fumed silica 5% Defoamer 0.2% Dow Corning silane coupling agent OFS-6032 2.8% Component 2 is a curing agent; 3390 S2: High hardness UV ink coating: High hardness UV ink is coated on the cured transparent varnish, the thickness of the UV ink is 12 μm, a textured PET film is pressed on the UV ink and then cured with an LED lamp, the wavelength of the LED lamp is 395 nm, the LED lamp curing energy is 300 joules, and finally further heated and cured by infrared rays, the curing temperature is 120°C, and the curing time is 5 minutes; the obtained coating, such as Figure 2 As shown; The high hardness UV ink is composed of the following raw materials by weight percentage: PHEA monomer (2-phenoxyethyl acrylate monomer) 10% HDDA monomer (1,6-hexanediol diacrylate monomer) 34% IBOA monomer (isobornyl acrylate monomer) 30% Solid acrylic resin 25% Photoinitiator TPO 1%; The high-hardness UV ink preparation method is as follows: firstly, PHEA monomer, HDDA monomer, IBOA monomer and solid acrylic resin are dispersed in a disperser at 3000 revolutions for 120 minutes, then filtered through 200 meshes, and then a photoinitiator TPO is added for dispersion.

[0029] Embodiment 3 A high hardness UV ink coating method comprises the following steps: S1: Transparent varnish coating: a layer of low-temperature colorless varnish is coated on the transparent substrate with a coating thickness of 10 μm, and then heated and cured by infrared rays at a curing temperature of 150°C and a curing time of 4 minutes; The low-temperature colorless varnish is composed of component 1 and component 2 in a weight ratio of 95:5; wherein component 1 is composed of the following raw materials in weight percentage: Polyester resin 93% Hydrophobic fumed silica 3% Defoamer 0.3% Dow Corning silane coupling agent OFS-6020 3.7% Component 2 is a curing agent; 3390 S2: High hardness UV ink coating: High hardness UV ink is coated on the cured transparent varnish, the thickness of the UV ink is 15 μm, a textured PET film is pressed on the UV ink and then cured with an LED lamp, the wavelength of the LED lamp is 395 nm, the LED lamp curing energy is 500 joules, and finally further heated and cured by infrared rays, the curing temperature is 120°C, and the curing time is 5 minutes; the obtained coating, such as Figure 3 As shown; The high hardness UV ink is composed of the following raw materials by weight percentage: PHEA monomer (2-phenoxyethyl acrylate monomer) 30% HDDA monomer (1,6-hexanediol diacrylate monomer) 25% IBOA monomer (isobornyl acrylate monomer) 10% Solid acrylic resin 34% Photoinitiator TPO 1%; The high-hardness UV ink preparation method is as follows: firstly, PHEA monomer, HDDA monomer, IBOA monomer and solid acrylic resin are dispersed in a disperser at 3000 revolutions for 120 minutes, then filtered through 200 meshes, and then a photoinitiator TPO is added for dispersion.

[0030] Embodiment 4 A high hardness UV ink coating method comprises the following steps: S1: Transparent varnish coating: a layer of low-temperature colorless varnish is coated on the transparent substrate with a coating thickness of 6 μm, and then heated and cured by infrared rays at a curing temperature of 100°C and a curing time of 6 minutes; The low-temperature colorless varnish is composed of component 1 and component 2 in a weight ratio of 88:12; wherein component 1 is composed of the following raw materials in weight percentage: Polyester resin 95% Hydrophobic fumed silica 1% Defoamer 0.5% Dow Corning silane coupling agent OFS-6011 3.5% Component 2 is a curing agent; S2: High hardness UV ink coating: High hardness UV ink is coated on the cured transparent varnish, the thickness of the UV ink is 10 μm, a textured PET film is pressed on the UV ink and then cured with an LED lamp, the wavelength of the LED lamp is 395 nm, the LED lamp curing energy is 350 joules, and finally further heated and cured by infrared rays, the curing temperature is 120°C, and the curing time is 5 minutes; the obtained coating, such as Figure 4 As shown; The high hardness UV ink is composed of the following raw materials by weight percentage: PHEA monomer (2-phenoxyethyl acrylate monomer) 25% HDDA monomer (1,6-hexanediol diacrylate monomer) 28% IBOA monomer (isobornyl acrylate monomer) 15% Solid acrylic resin 30% Photoinitiator TPO 2%; The high-hardness UV ink preparation method is as follows: firstly, PHEA monomer, HDDA monomer, IBOA monomer and solid acrylic resin are dispersed in a disperser at 3000 revolutions for 120 minutes, then filtered through 200 meshes, and then a photoinitiator TPO is added for dispersion.

[0031] The coatings obtained in the above examples 1-4 were subjected to performance tests, as follows: The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A high hardness UV ink coating method, characterized in that: The following steps are involved: S1: Transparent varnish coating: coating a layer of low-temperature colorless varnish on the transparent substrate, and then heating it to solidify it; S2: High hardness UV ink coating: Use high hardness UV ink to coat the cured transparent varnish, press the textured PET film on the UV ink, then cure it with LED lamp, and finally heat and bake.

2. The high hardness UV ink coating method according to claim 1, characterized in that: The low-temperature colorless varnish is composed of component 1 and component 2 in a weight ratio of 85-95:5-15; wherein, Component 1 is composed of the following raw materials by weight percentage: Polyester resin 90~95% Hydrophobic fumed silica 1~8% Defoamer 0.1~1% Silane coupling agent 1~5% Component 2 is a curing agent.

3. The high hardness UV ink coating method according to claim 1 or 2, characterized in that: In step S1, the coating thickness is 5 to 10 μm.

4. The high hardness UV ink coating method according to claim 1, characterized in that: The high hardness UV ink is composed of the following raw materials by weight percentage: PHEA monomer 10~30% HDDA monomer 25~35% IBOA monomer 10~30% Solid acrylic resin 25~35% Photoinitiator TPO 1%~2%.

5. The high hardness UV ink coating method according to claim 1 or 4, characterized in that: In step S2, the thickness of the UV ink is 10-15 μm.

6. The high hardness UV ink coating method according to claim 1, characterized in that: In step S1, heating to cure means heating and curing by infrared rays, with a curing temperature of 100-150° C. and a curing time of 3-10 minutes.

7. The high hardness UV ink coating method according to claim 1, characterized in that: In step S2, the wavelength of the LED lamp is 395 nm, and the curing energy of the LED lamp is 300-500 joules.

8. The high hardness UV ink coating method according to claim 3, characterized in that: The silane coupling agent is selected from Dow Corning silane coupling agent OFS-6040\6020\6011\6032.

9. A high hardness UV ink coating method, characterized in that: The invention is prepared by the coating method of high-hardness UV ink as described in any one of claims 1 to 8.

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