Spot-color UV ink for traffic signs and preparation method of spot-color UV ink

Abstract

The invention discloses spot-color UV ink for traffic signs. The spot-color UV ink comprises the following components: 15-56.5% of a pre-mixed pigment, 40-70% of UV-cured resin, 3-10% of a photoinitiator and 0.5-5% of an auxiliary agent, the auxiliaries comprise a flatting agent, a defoaming agent and a dispersing agent; the preset pigment is selected from one standard traffic color of yellow, orange, red, green, blue, brown and black; the preparation method of the spot-color UV ink for the traffic signs is characterized by comprising the following steps: (a) mixing UV curing resin and a pre-mixed pigment according to a ratio, and pre-dispersing to form a base material; (b) grinding the base material in a nanoscale sand mill until the particle size of the pigment is less than or equal to 1 mu m; (c) adding a photoinitiator and an auxiliary agent, and stirring for 30-60 minutes at the speed of 800-1500 rpm to form a homogeneous mixture; (d) filtering the mixture, and controlling the aperture of a filter screen to be less than or equal to 1 mu m to obtain finished ink; the UV ink has the advantages that the color space and the retroreflection brightness of the UV ink can meet the standard requirements, the color is stable, and the problems of inaccurate color and the like caused by the influence of the voltage waveform of a printer nozzle are solved.

Description

Technical Field

[0001] The invention relates to the technical field of traffic sign spot color UV ink and a preparation method thereof, and in particular to traffic sign spot color UV ink and a preparation method thereof. Background Art

[0002] With the rapid development of road traffic networks, traffic signs, as core facilities to ensure traffic safety, have become the focus of industry attention in terms of visibility, durability and color accuracy. Traditional traffic signs are mostly made with solvent-based inks or ordinary UV inks, which achieve standard color presentation by mixing and superimposing multiple colors. However, the existing technology has significant defects in practical applications:

[0003] First, traditional solvent-based inks have a slow curing speed and high VOCs emissions, which do not meet environmental protection requirements; second, although the curing efficiency of ordinary UV inks is improved, the color stability is subject to the influence of the printer nozzle voltage waveform, color management software (RIP) parameter settings and multi-channel mixing process, which can easily lead to color deviation and make it difficult to accurately match the strict color gamut requirements of the national standard (GB / T18833), American standard (ASTMD4956) and European standard (EN12899).

[0004] Therefore, in view of the above problems, a traffic sign spot color UV ink and a preparation method are developed. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a traffic sign spot color UV ink and a preparation method thereof.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is a traffic sign spot color UV ink, comprising the following components:

[0007] Pre-colorant 15%-56.5%, UV curing resin 40-70%, photoinitiator 3-10%, additive 0.5-5%;

[0008] The auxiliary agents include leveling agents, defoaming agents and dispersants;

[0009] The pre-adjusted colorant is selected from a standard traffic color of yellow, orange, red, green, blue, brown and black.

[0010] As an improvement, the UV curable resin is selected from at least one of epoxy acrylate and polyurethane acrylate, and has a viscosity of 200-800 mPa·s (25° C.).

[0011] As an improvement, the photoinitiator includes at least one of 2-hydroxy-2-methylpropiophenone (1173) and 1-hydroxycyclohexyl phenyl ketone (184), and the leveling agent in the auxiliary agent is a silicone leveling agent, and the defoaming agent is a polyether modified polysiloxane.

[0012] The method for preparing a traffic sign spot color UV ink is characterized by comprising the following steps:

[0013] (a) mixing a UV curable resin and a pre-tinted material in proportion and pre-dispersing the mixture to form a base material;

[0014] (b) grinding the base material in a nanometer sand mill until the colorant particle size is ≤1 μm;

[0015] (c) adding a photoinitiator and an auxiliary agent, and stirring at 800-1500 rpm for 30-60 minutes to form a homogeneous mixture;

[0016] (d) filtering the mixture and controlling the pore size of the filter to be ≤1 μm to obtain a finished ink.

[0017] As an improvement, the grinding fineness in step (b) is detected by a laser particle size analyzer to ensure that the D90 value is ≤0.8 μm.

[0018] As an improvement, the stirring process in step (c) is carried out under light-proof conditions and the temperature is controlled at 25-35°C.

[0019] The advantages of the present invention compared with the prior art are:

[0020] The color space and retroreflective brightness of this UV ink can meet the requirements of national standards, American standards, and European standards, and the color is not easily affected by the color RIP software settings and color curves, and will not cause color inaccuracies due to the influence of the printer nozzle voltage waveform. The color accuracy is stable, and it is printed directly on the white reflective film through the print head through a single channel of the printer's special color ink path. Only the ink output needs to be controlled to achieve accurate printing that meets the color standards. There is no need to mix multiple colors. The printed traffic sign pattern has stable color accuracy, a thin coloring layer, high light transmittance, and the color gamut and retroreflection coefficient meet the national standards, American standards, and European standards. DETAILED DESCRIPTION

[0021] The traffic sign spot color UV ink and the preparation method of the present invention are further described in detail below in conjunction with the embodiments.

[0022] Traffic sign spot color UV ink, including the following ingredients:

[0023] Pre-colorant 15%-56.5%, UV curing resin 40-70%, photoinitiator 3-10%, additive 0.5-5%;

[0024] The auxiliary agents include leveling agents, defoaming agents and dispersants;

[0025] The pre-adjusted colorant is selected from a standard traffic color of yellow, orange, red, green, blue, brown and black.

[0026] The UV curable resin is selected from at least one of epoxy acrylate and polyurethane acrylate, and has a viscosity of 200-800 mPa·s (25° C.).

[0027] The photoinitiator includes at least one of 2-hydroxy-2-methylpropiophenone (1173) and 1-hydroxycyclohexyl phenyl ketone (184), and the leveling agent in the auxiliary agent is an organic silicon leveling agent, and the defoaming agent is a polyether modified polysiloxane.

[0028] The method for preparing a traffic sign spot color UV ink is characterized by comprising the following steps:

[0029] (a) mixing a UV curable resin and a pre-tinted material in proportion and pre-dispersing the mixture to form a base material;

[0030] (b) grinding the base material in a nanometer sand mill until the colorant particle size is ≤1 μm, and the grinding fineness is detected by a laser particle size analyzer to ensure that the D90 value is ≤0.8 μm;

[0031] (c) adding a photoinitiator and an auxiliary agent, stirring at 800-1500 rpm for 30-60 minutes to form a homogeneous mixture, wherein the stirring process in step (c) is carried out in a dark environment and the temperature is controlled at 25-35° C.;

[0032] (d) filtering the mixture and controlling the pore size of the filter to be ≤1 μm to obtain a finished ink.

[0033] When the present invention is implemented,

[0034] Example 1: Preparation of yellow traffic sign spot color UV ink

[0035] Prepare the ingredients:

[0036] Pre-adjusted color (yellow): 20%

[0037] UV curing resin (epoxy acrylate, viscosity 300mPa·s, 25°C): 65%

[0038] Photoinitiator (2-hydroxy-2-methylpropiophenone (1173)): 8%

[0039] Additives (organic silicone leveling agent, polyether modified polysiloxane defoamer and dispersant, the ratio of the three is 1:1:3): 7%

[0040] Preparation steps:

[0041] (a) mixing a UV curable resin and a yellow pre-adjusted colorant in proportion, and pre-dispersing the mixture using a high-speed stirrer at a speed of 500 rpm for 30 minutes to form a base material;

[0042] (b) grinding the base material in a nano-scale sand mill, and detecting the grinding fineness by a laser particle size analyzer during the grinding process to ensure that the D90 value is ≤0.8 μm and the final colorant particle size is ≤1 μm;

[0043] (c) adding a photoinitiator and an auxiliary agent, stirring at 1000 rpm for 45 minutes under light-proof conditions and controlling the temperature at 30° C. to form a homogeneous mixture;

[0044] (d) filtering the mixture through a filter with a pore size of ≤1 μm to obtain a finished yellow traffic sign spot color UV ink.

[0045] Example 2: Preparation of orange traffic sign spot color UV ink

[0046] Prepare the ingredients:

[0047] Pre-mixed color (orange): 15%

[0048] UV curing resin (polyurethane acrylate, viscosity 500mPa·s, 25°C): 70%

[0049] Photoinitiator (1-hydroxycyclohexylphenyl ketone (184)): 10%

[0050] Additives (organic silicone leveling agent, polyether modified polysiloxane defoamer and dispersant, the ratio of the three is 1:1:3): 5%

[0051] Preparation steps:

[0052] (a) A UV curable resin and an orange pre-tinted material were mixed in proportion and pre-dispersed using a high-speed stirrer at a speed of 600 rpm for 35 minutes to form a base material.

[0053] (b) Grinding the base material in a nanometer sand mill and testing it with a laser particle size analyzer to ensure that the D90 value is ≤0.8 μm and the particle size of the colorant is ≤1 μm.

[0054] (c) adding a photoinitiator and an auxiliary agent, stirring at 1200 rpm for 50 minutes under light-proof conditions and controlling the temperature at 28° C. to form a homogeneous mixture.

[0055] (d) filtering the mixture through a filter with a pore size of ≤1 μm to obtain a finished orange traffic sign spot color UV ink.

[0056] Example 3: Preparation of green traffic sign spot color UV ink

[0057] Prepare the ingredients:

[0058] Pre-mixed color (green): 25%

[0059] UV curing resin (epoxy acrylate and polyurethane acrylate mixed in a ratio of 1:1, viscosity 400mPa·s, 25°C): 60%

[0060] Photoinitiator (2-hydroxy-2-methylpropiophenone (1173) and 1-hydroxycyclohexylphenyl ketone (184) mixed at a ratio of 1:1): 8%

[0061] Additives (organic silicone leveling agent, polyether modified polysiloxane defoamer and dispersant, the ratio of the three is 1:1:3): 7%

[0062] Preparation steps:

[0063] (a) A UV curable resin and a green pre-tinted material were mixed in proportion and pre-dispersed using a high-speed stirrer at a speed of 450 rpm for 25 minutes to form a base material.

[0064] (b) Grind the base material in a nanometer sand mill and detect it with a laser particle size analyzer to ensure that the D90 value is ≤0.8 μm and the colorant particle size is ≤1 μm.

[0065] (c) adding a photoinitiator and an auxiliary agent, stirring at 900 rpm for 35 minutes under light-proof conditions and controlling the temperature at 32° C. to form a homogeneous mixture.

[0066] (d) filtering the mixture through a filter with a pore size of ≤1 μm to obtain a finished green traffic sign spot color UV ink.

[0067] The present invention and its embodiments are described above, and such description is not restrictive. What is described in the embodiment is only one of the embodiments of the present invention, and is not actually limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, and without creatively designing methods and embodiments similar to the technical solution, they should all fall within the protection scope of the present invention.

Claims

1. Traffic sign spot color UV ink, characterized by: Contains the following ingredients: Pre-colorant 15%-56.5%, UV curing resin 40-70%, photoinitiator 3-10%, additive 0.5-5%; The auxiliary agents include leveling agents, defoaming agents and dispersants; The pre-adjusted colorant is selected from a standard traffic color of yellow, orange, red, green, blue, brown and black.

2. The traffic sign spot color UV ink and preparation method according to claim 1, characterized in that: The UV curable resin is selected from at least one of epoxy acrylate and polyurethane acrylate, and has a viscosity of 200-800 mPa·s (25° C.).

3. The traffic sign spot color UV ink and preparation method according to claim 1, characterized in that: The photoinitiator includes at least one of 2-hydroxy-2-methylpropiophenone (1173) and 1-hydroxycyclohexyl phenyl ketone (184), and the leveling agent in the auxiliary agent is an organic silicon leveling agent, and the defoaming agent is a polyether modified polysiloxane.

4. The method for preparing the traffic sign spot color UV ink according to any one of claims 1 to 3, characterized in that: The following steps are involved: (a) mixing a UV curable resin and a pre-tinted material in proportion and pre-dispersing the mixture to form a base material; (b) grinding the base material in a nanometer sand mill until the colorant particle size is ≤1 μm; (c) adding a photoinitiator and an auxiliary agent, and stirring at 800-1500 rpm for 30-60 minutes to form a homogeneous mixture; (d) filtering the mixture and controlling the pore size of the filter to be ≤1 μm to obtain a finished ink.

5. The method for preparing the traffic sign spot color UV ink according to claim 4, characterized in that: The grinding fineness in step (b) is detected by a laser particle size analyzer to ensure that the D90 value is ≤0.8 μm.

6. The method for preparing the traffic sign spot color UV ink according to claim 4, characterized in that: The stirring process in step (c) is carried out under light-proof conditions and the temperature is controlled at 25-35°C.