Printing ink, preparation method thereof and printed product

Abstract

The invention provides ink, a preparation method thereof and a printed product. The ink is prepared from the following raw materials in percentage by mass: 13 to 17 weight percent of four-functionality polyester acrylic resin, 8 to 12 weight percent of modified epoxy acrylic resin, 5 to 10 weight percent of ethoxylated trimethylolpropane triacrylate, 3 to 7 weight percent of 1, 6-hexanediol diacrylate, 40 to 60 weight percent of titanium dioxide, 0.5 to 1.5 weight percent of polyethylene wax, 7.5 to 14 weight percent of photosensitizer, 0.5 to 1.5 weight percent of heat stabilizer and 0.4 to 20 weight percent of pigment. Wherein the pigment comprises at least one of a red pigment, a yellow pigment, a blue pigment and a black pigment. The ink provided by the invention can weaken or even eliminate the influence of a fluorescent whitening agent on metamerism, so that the color of a printed matter is kept consistent, and the quality of the printed matter can reach continuous stability.

Description

Technical Field

[0001] The present application relates to the technical field of inks, and in particular to an ink for solving the metamerism phenomenon, a preparation method thereof, and printed products. Background Art

[0002] Many paper suppliers rely too much on optical brighteners (OBAs) to achieve a uniform whiteness. However, this practice affects the consistency of printed products and leads to metamerism. This means that even if the same color ink is used for printing, the color displayed on different papers may be different, thus affecting the overall visual effect of the printed product.

[0003] Each printing supplier uses different substrates, which results in different fluorescent brightener content in the paper. In addition, the inks used for printing are also different, which leads to large differences in the consistency of the overall effect of the printed product. For different suppliers, the ink only needs to meet the customer's printing hue and color difference value within a reasonable range, resulting in uneven printing quality.

[0004] The contents of the background technology section are merely the technologies known to the inventors and do not necessarily represent the prior art in the field. Summary of the invention

[0005] In view of at least one problem of the above-mentioned prior art, the first object of the present invention is to provide an ink for solving metamerism, comprising the following raw materials in percentage by mass:

[0006] 13-17wt% tetrafunctional polyester acrylic resin, 8-12wt% modified epoxy acrylic resin, 5-10wt% ethoxylated trimethylolpropane triacrylate, 3-7wt% 1,6-hexanediol diacrylate, 40-60wt% titanium dioxide, 0.5-1.5wt% polyethylene wax, 7.5-14wt% photosensitizer, 0.5-1.5wt% heat stabilizer and 0.4-20wt% pigment;

[0007] Wherein, the pigment includes at least one of a red pigment, a yellow pigment, a blue pigment and a black pigment.

[0008] In some embodiments of the present application, the red pigment is CLARIANT Permanent L5B01 model pigment, the yellow pigment is CLARIANT Permanent Yellow GR model pigment, the blue pigment is ClariantPV Fast Blue model pigment, and the black pigment is Evonik Degussa SPECIAL BLACK 4A model pigment.

[0009] In some embodiments of the present application, the photosensitizer includes one or more of 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, TPO-L and photosensitizer 819.

[0010] In some embodiments of the present application, the tetrafunctional polyester acrylic resin includes at least one of polyester acrylic resin, polyether-modified polyester acrylic resin, and silicone-modified polyester acrylic resin.

[0011] In some embodiments of the present application, the modified epoxy acrylic resin includes at least one of rosin-modified epoxy acrylic resin, fatty acid-modified epoxy acrylic resin, bisphenol A-modified epoxy acrylic resin, phenolic-modified epoxy acrylic resin and siloxane-modified epoxy acrylic resin.

[0012] In some embodiments of the present application, the particle size of the titanium dioxide is less than 0.36 μm, the particle size distribution is between 0.25 and 0.36 μm, and the density is 0.38 to 0.42 g / cm 2 .

[0013] The second object of the present application is to provide a method for preparing any of the above inks, comprising the following steps:

[0014] S1: mixing tetrafunctional polyester acrylic resin, modified epoxy acrylic resin, ethoxylated trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, titanium dioxide, polyethylene wax, photosensitizer, heat stabilizer and pigment, stirring them evenly and leaving them for a predetermined time to fully wet the mixed pigment; and

[0015] S2: Grinding the mixed pigment after being placed for the predetermined time, so that the mixed pigment reaches a predetermined fineness.

[0016] In some embodiments of the present application, the predetermined time is greater than 4 hours, and the predetermined fineness is less than 5 μm.

[0017] The third object of the present application is to provide a printed product, comprising a base paper and an ink layer, wherein the ink layer is formed by printing any of the above-mentioned inks on the base paper.

[0018] In some embodiments of the present application, the measured value of the fluorescent brightener of the base paper is 7-10wt%, and the measured value of the fluorescent brightener of the printed product is 0-3wt%.

[0019] The ink provided by the present invention can reduce or even eliminate the influence of the fluorescent whitening agent on the metamerism, so that the color of the printed matter can be kept consistent and the quality of the printed matter can achieve continuous stability.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present disclosure are used to provide a further understanding of the present disclosure. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0022] Figure 1 The figure is a schematic diagram of a process flow for preparing ink according to an embodiment of the present invention.

[0023] Figure 2 The printed product produced according to the embodiment of the present invention is shown.

[0024] Figure 3 The base paper used in the embodiment of the present invention is shown.

[0025] Figure 4 The target print product of the embodiment of the present invention is shown. DETAILED DESCRIPTION

[0026] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0027] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0028] As used herein, "about" or "approximately" includes the stated value and means within an acceptable range of deviation from the particular value as determined by one skilled in the art, taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of the stated value.

[0029] The following is a more detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings and examples, so that the scheme of the present invention and its advantages in various aspects can be better understood. However, the specific embodiments and examples described below are only for the purpose of illustration, rather than for limiting the present invention.

[0030] The ink provided in the present application for reducing or eliminating metamerism includes the following raw materials: tetrafunctional polyester acrylic resin, modified epoxy acrylic resin, ethoxylated trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, titanium dioxide, polyethylene wax, photosensitizer, heat stabilizer and pigment.

[0031] Wherein, the content of tetrafunctional polyester acrylic resin is 13-17wt%. In some embodiments of the present application, its content may be 13wt%, 14wt%, 15wt%, 16wt% or 17wt%. Optionally, the tetrafunctional polyester acrylic resin used in the present application refers to a polyester acrylic oligomer molecular chain containing 4 acrylic double bonds. Optionally, it includes at least one of polyester acrylic resin, polyether modified polyester acrylic resin, and silicone modified polyester acrylic resin. Its function is to provide a strong ink-water balance, increase adhesion to the substrate and interlayer adhesion between color layers.

[0032] The content of the modified epoxy acrylic resin is 8-12wt%. In some embodiments of the present application, the content may be 8wt%, 9wt%, 10wt%, 11wt% or 12wt%. Optionally, the modified epoxy acrylic resin includes at least one of rosin-modified epoxy acrylic resin, fatty acid-modified epoxy acrylic resin, bisphenol A-modified epoxy acrylic resin, phenolic-modified epoxy acrylic resin and siloxane-modified epoxy acrylic resin. The modified epoxy acrylic resin has the function of increasing the curing speed, improving the wetting performance of the pigment and the glossiness.

[0033] The content of ethoxylated trimethylolpropane triacrylate (EO3TMPTA) is 5-10 wt %. In some embodiments of the present application, the content may be 5 wt %, 6 wt %, 7 wt %, 8 wt %, 9 wt % or 10 wt %.

[0034] The content of 1,6-hexanediol diacrylate (HDDA) is 3-7 wt %. In some embodiments of the present application, the content of HDDA may be 3 wt %, 4 wt %, 5 wt %, 6 wt % or 7 wt %.

[0035] The content of titanium dioxide is 40-60 wt%. The particle size of the titanium dioxide used in the present invention is less than 0.36 μm, the particle size distribution is between 0.25-0.36 μm, and the density is 0.38-0.42 g / cm 2The titanium dioxide used in the present invention has a small particle size, a narrow particle size distribution, and a high density, which is beneficial to improving the hiding power and whiteness of the ink. In some specific embodiments, the mass percentage of the titanium dioxide can be 40wt%, 42wt%, 44wt%, 46wt%, 48wt%, 50wt%, 52wt%, 54wt%, 56wt%, 58wt% or 60wt%.

[0036] The content of polyethylene wax is 0.5-1.5wt%. Polyethylene wax mainly plays a role of wear resistance in the present invention. In some embodiments of the present application, the content of polyethylene wax can be 0.5wt%, 1wt% or 1.5wt%.

[0037] The content of the photosensitizer is 7.5 to 14 wt%. Optionally, the photosensitizer includes one or more of 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, TPO-L and photosensitizer 819. When used in combination, the drying time of the ink can be reduced. In some embodiments of the present application, the content of the photosensitizer may be 7.5 wt%, 8 wt%, 10 wt%, 12 wt% or 14 wt%. The content of 1-hydroxycyclohexyl phenyl ketone may be 3 to 5 wt%, the content of TPO-L may be 4 to 8 wt%, and the content of photosensitizer 819 may be 0.5 to 1 wt%.

[0038] The content of the heat stabilizer is 0.5-1.5 wt%. The heat stabilizer in the present invention mainly plays the role of improving the adhesion of the ink. In some embodiments of the present application, the content of the heat stabilizer can be 0.5 wt%, 1 wt% or 1.5 wt%.

[0039] The pigment used in this application includes at least one of red pigment, yellow pigment, blue pigment and black pigment. Its total amount can be 0.4-20wt%. The use of pigment can make the color of the paper printed with ink closer to the target color. The amount of each of red pigment, yellow pigment, blue pigment and black pigment can be determined according to the target color. Optionally, the red pigment is CLARIANT Permanent L5B01 model pigment, the yellow pigment is CLARIANT Permanent Yellow GR model pigment, the blue pigment is Clariant PV Fast Blue model pigment, and the black pigment is Evonik Degussa SPECIAL BLACK 4A model pigment. In some embodiments of the present application, the content of the pigment can be 0.4wt%, 2wt%, 4wt%, 6wt%, 8wt%, 10wt%, 12wt%, 14wt%, 16wt%, 18wt% or 20wt%.

[0040] The ink provided by the present invention can reduce or even eliminate the influence of the fluorescent whitening agent on the metamerism, so that the color of the printed matter can be kept consistent and the quality of the printed matter can achieve continuous stability.

[0041] Figure 1 A method for preparing the above-mentioned ink provided in an embodiment of the present application is shown, comprising the following steps S1 and S2.

[0042] S1: tetrafunctional polyester acrylic resin, modified epoxy acrylic resin, ethoxylated trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, titanium dioxide, polyethylene wax, photosensitizer, heat stabilizer and pigment are mixed and stirred evenly and then placed for a predetermined time to allow the mixed pigment to be fully wetted.

[0043] Optionally, a planetary mixer is used for stirring. Further optionally, the stirring time is 30 to 50 minutes. In some specific embodiments, the stirring time can be 30 minutes, 35 minutes, 40 minutes, 45 minutes or 50 minutes.

[0044] Optionally, the predetermined time is greater than 4 hours. The mixed pigment is allowed to stand for more than 4 hours to be fully moistened before grinding.

[0045] S2: Grinding the mixed pigment after being placed for a predetermined time to make the mixed pigment reach a predetermined fineness.

[0046] Optionally, a three-roll mill is used to grind at least 2 times so that the mixed pigment reaches a predetermined fineness. The pressure of the three-roll mill can be set according to the fineness requirement, and the fineness can be detected using a fineness meter. Optionally, the predetermined fineness is <5 μm.

[0047] Optionally, the prepared ink is subjected to a three-roll mill to remove air bubbles and is then ready for packaging.

[0048] The present application further provides a printed product, which includes a base paper and an ink layer, wherein the ink layer is formed by printing any of the above-mentioned inks on the base paper. The ink can be printed on the surface of the paper by offset printing.

[0049] The printed product provided by the present invention has almost no metamerism. Optionally, the measured value of the fluorescent brightener of the base paper is 7-10wt%, and the measured value of the fluorescent brightener of the printed product is 0-3wt%.

[0050] The present invention is described below with reference to specific embodiments. The process condition values ​​taken in the following embodiments are all exemplary, and the possible numerical ranges are as shown in the above invention content. For process parameters not specifically noted, conventional techniques can be used. Unless otherwise specified, the detection methods used in the following embodiments are conventional detection methods in the industry. Unless otherwise specified, the reagents and instruments used in the technical solutions provided by the present invention can be purchased from conventional channels or the market.

[0051] Example

[0052] This example prepares a printed product, and the base paper is 190g ENSO paper. The specific preparation steps are as follows:

[0053] First, tetrafunctional polyester acrylic resin, modified epoxy acrylic resin, ethoxylated trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, titanium dioxide, polyethylene wax, photosensitizer, heat stabilizer and pigment were mixed and stirred evenly according to the mass percentage in Table 1 to obtain a mixed pigment. The mixed pigment was then placed for 5 hours to allow the mixed pigment to be fully wetted. The mixed pigment was then ground in a three-roll mill to obtain a fineness of less than 5 μm to obtain the desired ink.

[0054] Use IGT quantitative instrument to measure 0.15CC of the stirred ink, add it to the ink roller of Caibang CB225A color display instrument, start the ink distribution for 70 to 90 seconds, use the base paper as the substrate, and spread the sample after the ink is rolled evenly. After drying, use X-riteCI7800 to detect the sample, and set the color difference value to △E<1 to pass. Measurement settings: measurement mode M1, light source / viewing angle D50 / 2°, △E mode CIE△2000. The results are shown in Table 2. At the same time, the fineness plate, viscosity meter and fluidity meter are used to measure the fineness, viscosity and fluidity of the ink. Finally, the drying experiment is used to determine its dryness. The viscosity test of the ink is the force required for the separation between the metal ink roller and the rubber ink roller, and the force measured by the instrument is the relative size. The measurement results are shown in Table 2.

[0055] Then fold the sample in half and check if there are any cracks. The result shows no cracks.

[0056] Use 3M610 tape to compact the ink printed surface of the sample, pull it up vertically 90 degrees quickly, and observe whether there is white ink. The result shows that no ink falls off.

[0057] The fluorescent brightener values ​​of the base paper and printed products tested by densitometer were 7.7 and 2.5 respectively.

[0058] Finally, the ink is printed onto the surface of the base paper by offset printing. Figure 2 shown.

[0059] Table 1 Raw materials used in the examples

[0060]

[0061]

[0062] Table 2 Performance parameters of ink in the examples

[0063]

[0064]

[0065] Figure 3 The base paper used in this embodiment is shown. Figure 4 The target print product of this embodiment is shown. Figures 2 to 4 It can be seen that when the base paper is printed with the ink provided by the present invention, the visual color of the printed product is closer to the target printed product than the base paper.

[0066] From the above tests, it can be seen that the ink provided by the present invention can reduce or even eliminate the influence of fluorescent whitening agent on metamerism, so that the color of the printed matter can be kept consistent, and the quality of the printed matter can achieve continuous stability. Moreover, the printing adaptability is also very good.

[0067] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ink, characterized in that: The following raw materials are included in mass percentage: 13-17wt% tetrafunctional polyester acrylic resin, 8-12wt% modified epoxy acrylic resin, 5-10wt% ethoxylated trimethylolpropane triacrylate, 3-7wt% 1,6-hexanediol diacrylate, 40-60wt% titanium dioxide, 0.5-1.5wt% polyethylene wax, 7.5-14wt% photosensitizer, 0.5-1.5wt% heat stabilizer and 0.4-20wt% pigment; Wherein, the pigment includes at least one of a red pigment, a yellow pigment, a blue pigment and a black pigment.

2. The ink according to claim 1, characterized in that The red pigment is CLARIANT Permanent L5B01 pigment, the yellow pigment is CLARIANT Permanent Yellow GR pigment, the blue pigment is Clariant PV Fast Blue pigment, and the black pigment is Evonik Degussa SPECIAL BLACK 4A pigment.

3. The ink according to claim 1, characterized in that The photosensitizer includes one or more of 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, TPO-L and photosensitizer 819.

4. The ink according to claim 1, characterized in that The tetrafunctional polyester acrylic resin includes at least one of polyester acrylic resin, polyether-modified polyester acrylic resin, and silicone-modified polyester acrylic resin.

5. The ink according to claim 1, characterized in that The modified epoxy acrylic resin includes at least one of rosin modified epoxy acrylic resin, fatty acid modified epoxy acrylic resin, bisphenol A modified epoxy acrylic resin, phenol formaldehyde modified epoxy acrylic resin and siloxane modified epoxy acrylic resin.

6. The ink according to claim 1, characterized in that The particle size of the titanium dioxide is less than 0.36 μm, the particle size distribution is between 0.25 and 0.36 μm, and the density is 0.38 to 0.42 g / cm 2 .

7. A method for preparing the ink according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: mixing tetrafunctional polyester acrylic resin, modified epoxy acrylic resin, ethoxylated trimethylolpropane triacrylate, 1,6-hexanediol diacrylate, titanium dioxide, polyethylene wax, photosensitizer, heat stabilizer and pigment, stirring them evenly and leaving them for a predetermined time to fully wet the mixed pigment; and S2: Grinding the mixed pigment after being placed for the predetermined time, so that the mixed pigment reaches a predetermined fineness.

8. The preparation method according to claim 5, characterized in that: The predetermined time is greater than 4 hours, and the predetermined fineness is less than 5 μm.

9. A printed product, characterized in that: The invention comprises a base paper and an ink layer, wherein the ink layer is formed by printing the ink described in any one of claims 1 to 6 on the base paper.

10. The printed product according to claim 9, characterized in that The measured value of the fluorescent brightener in the base paper is 7-10 wt %, and the measured value of the fluorescent brightener in the printed product is 0-3 wt %.

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