A special ink for printing embroidery or water drop effect on paper

Abstract

The application discloses a special ink capable of printing embroidery or water-bead effect on paper surface and relates to the technical field of printing ink. The ink is prepared from 35-55 parts of monomer mixture, 17-28 parts of organic pigment, 0.4-1.6 parts of photopolymerization initiator, 5-15 parts of diluent, 3-7 parts of stabilizer, 12-18 parts of bronze powder, 3-5 parts of vegetable oil and 10-12 parts of dryness promoting agent. The prepared ink can print the embroidery effect similar to that on the woven cloth or the three-dimensional effect such as water-bead on the paper surface. Meanwhile, the ink has high wear resistance after solidification, can reach more than 100 times through the grinding wheel friction test, has good adhesion, fast solidification speed, excellent three-dimensional effect and can produce excellent embroidery and water-bead effect. Meanwhile, the whole material is relatively environment-friendly and is suitable for large-scale application.

Description

Technical Field

[0001] This invention relates to the field of printing ink technology, and in particular to a special ink that can print embroidery or water droplet effects on the surface of paper. Background Technology

[0002] Ink is a homogeneous mixture composed of colored substances (such as pigments and dyes), binders, fillers, and additives; it can be printed and dries on the printed surface; it is a colored paste-like adhesive with a certain degree of fluidity. Therefore, color (hue), body (rheological properties such as viscosity and fluidity), and drying properties are the three most important properties of ink.

[0003] There are many types of these binders, and their physical properties vary. Some are very thick and viscous, while others are quite thin. Some use vegetable oil as a binder; others use resin and solvents or water. These factors depend on the printing medium, the printing method, the type of printing plate, and the drying method.

[0004] With the development of printing technology and the increasing demand for aesthetics, consumers and businesses have higher requirements for the exquisiteness of product packaging and printed materials. Simple flat printing can no longer satisfy consumers' visual experience. More and more packaging is beginning to use three-dimensional surface processes such as embossing, debossing, hot stamping, and spot UV coating to enhance the visual effect of the packaging surface.

[0005] For example, Chinese Patent No. CN111070932A discloses a UV three-dimensional effect printing process, which includes the following steps: (1) preparing ink: the ink includes magnetic pigment and UV oil; (2) screen printing: the prepared ink is screen printed onto the surface of the substrate; (3) magnetization treatment: the printed substrate is treated with a patterned magnetic plate; (4) UV curing: the magnetized substrate is cured with UV light.

[0006] The printing process of this invention involves adding magnetic pigments to the ink, screen printing it onto the surface of paper, then magnetizing and arranging the pattern using a customized pattern magnetic plate, and finally curing the ink with ultraviolet light. This allows a process that is usually used on smooth surfaces such as glass or ceramics to be applied to paper, resulting in a metallic feel, visual effects, and high light reflection.

[0007] However, including the inventions mentioned above, these common printing processes mainly use ordinary inks. Therefore, the effect produced by using such printing processes and inks is only a raised or recessed effect. Moreover, they require multiple plate making and overprinting, making the process complex and costly. Summary of the Invention

[0008] In view of the above-mentioned technical problems and to overcome the shortcomings of the prior art, the present invention provides a special ink that can print embroidery or water droplet effects on the surface of paper.

[0009] To solve the above technical problems, the present invention provides a special ink that can print embroidery or water droplet effects on the surface of paper.

[0010] Technical effects: This ink can be used to print embroidery-like effects or water droplets on the surface of paper. The ink is also highly wear-resistant after curing, and can withstand more than 100 abrasion tests. It has good adhesion, fast curing speed, and excellent three-dimensional effect, producing excellent embroidery and water droplet effects. At the same time, the overall material is relatively environmentally friendly and suitable for large-scale application.

[0011] The technical solution further defined in this invention is:

[0012] A special ink that can print embroidery or water droplet effects on paper surfaces comprises the following components by weight:

[0013] 35-55 parts of monomer mixture

[0014] 17-28 parts organic pigment

[0015] Photopolymerization initiator 0.4–1.6 parts

[0016] 5-15 parts of diluent

[0017] stabilizer 3-7 parts

[0018] 12-18 parts bronze powder

[0019] 3-5 parts vegetable oil

[0020] 1.5 to 2 parts of drying accelerator;

[0021] The monomer mixture comprises polyester film powder, tripropylene glycol diacrylate, and trimethylolpropane triacrylate in a weight ratio of 1:5:2.

[0022] Furthermore, the photoinitiating desiccant includes benzoin ether and benzophenone in a weight ratio of 1:2.

[0023] The aforementioned special ink that can print embroidery or water droplet effects on the surface of paper contains pearlescent pigments and fillers, with the pearlescent pigments accounting for 50-70% of the weight of the organic pigments.

[0024] The aforementioned special ink that can print embroidery or water droplet effects on the surface of paper has bronze powder with a particle size of 15-20 μm.

[0025] The aforementioned special ink that can print embroidery or water droplet effects on the surface of paper uses water or ethanol as a diluent, with an ethanol concentration of 70%.

[0026] The aforementioned special ink that can print embroidery or water droplet effects on the surface of paper contains vegetable oils such as soybean oil methyl ester, soybean oil ethyl ester, soybean oil isobutyl ester, palm oil methyl ester, palm oil ethyl ester, palm oil isobutyl ester, rapeseed oil methyl ester, rapeseed oil ethyl ester, rapeseed oil isobutyl ester, methyl oleate, fatty acid ethyl ester, tricitrate, or trimethyl citrate.

[0027] The aforementioned special ink that can print embroidery or water droplet effects on the surface of paper contains at least one of butyl hydroxybenzoic acid or Hals stabilizer as a stabilizer.

[0028] The aforementioned special ink, which can print embroidery or water droplet effects on the surface of paper, has a monomer mixture with a pH value of 4 to 6.

[0029] The aforementioned special ink that can print embroidery or water droplet effects on the surface of paper is cured by electron beam after printing, with an electron beam irradiation time of 0.5 seconds.

[0030] The beneficial effects of this invention are:

[0031] (1) The main idea of ​​this invention is to prepare a monomer mixture by mixing monomers, and then add a photopolymerization initiator and a drying accelerator to it. After printing, the mixture is cured by electron beam, which can greatly improve the curing efficiency, so that the ink can be cured within 1 / 20s of printing. A larger amount of ink can be coated during the printing process to form an excellent three-dimensional effect. In addition, the monomer mixture prepared by the three monomers can obtain a suitable ink flow under the action of vegetable oil and diluent, ensuring that the ink does not flow and disperse to both sides immediately after coating.

[0032] (2) In this invention, polyester film powder, tripropylene glycol diacrylate and trimethylolpropane triacrylate are mixed. Under the synergistic effect of the three, the anti-yellowing ability of the ink can be greatly improved. In addition, since it is necessary to strictly control the dosage of photoinitiator and drying accelerator, this monomer mixture can improve the drying rate of the ink and make up for the lack of dosage of photoinitiator and drying accelerator, thereby achieving excellent curing effect.

[0033] (3) In this invention, benzophenone and drying accelerator have a good combination effect and are not easy to bind the drying accelerator to accelerate the yellowing reaction. When used in combination with some benzoin ether, the curing efficiency is optimized and the yellowing reaction is not aggravated. The pearlescent pigment used is mainly composed of anatase or rutile titanium dioxide coated with mica flakes, which can exhibit a variety of delicate and soft silvery-white luster. Therefore, after adding pearlescent pigment, the water droplet effect on the paper surface can be made more excellent.

[0034] (4) In this invention, the addition of bronze powder can enhance the metallic texture and shiny effect of the ink after printing. When printing embroidery effects, the addition of bronze powder can enhance the layering of the printing, thereby optimizing the embroidery effect and improving the gloss of the printing. Using water and ethanol as diluents can reduce viscosity and reduce the toxicity of the ink, improve environmental friendliness, reduce the irritation of the ink to the skin, and improve the safety of use. The addition of vegetable oil can also regulate the fluidity of the ink and increase the tension of the ink, making it less likely to flow to both sides after printing.

[0035] (5) In this invention, the use of electron beam irradiation of ink can greatly shorten the curing time of ink. Electron beam processing is a cold processing, which consumes less energy and releases less heat and emits less odor. With the use of monomer mixture, the ink can be cured within 1 / 20s.

[0036] (6) In this invention, the prepared ink can print on the paper surface an effect similar to embroidery on fabric or a three-dimensional effect such as water droplets. At the same time, the ink has strong wear resistance after curing. It can reach more than 100 times after grinding wheel friction test. The ink has good adhesion, fast curing speed, and excellent three-dimensional effect, and can produce excellent embroidery and water droplet effects. At the same time, the overall material is relatively environmentally friendly and suitable for large-scale application. Detailed Implementation

[0037] This embodiment provides a special ink that can print embroidery or water droplet effects on the surface of paper, comprising the following components by weight:

[0038] 35-55 parts of monomer mixture

[0039] 17-28 parts organic pigment

[0040] Photopolymerization initiator 0.4–1.6 parts

[0041] 5-15 parts of diluent

[0042] stabilizer 3-7 parts

[0043] 12-18 parts bronze powder

[0044] 3-5 parts vegetable oil

[0045] 1.5 to 2 parts of drying accelerator;

[0046] The monomer mixture comprises polyester film powder, tripropylene glycol diacrylate, and trimethylolpropane triacrylate in a weight ratio of 1:5:2.

[0047] Because existing inks require multiple printing and curing processes to achieve a three-dimensional effect, this is mainly due to the low curing rate and high overall fluidity of the ink. As a result, it is impossible to apply a large amount of ink at once during the printing process. The applied ink will flow to both sides during the curing process, thus affecting the printing effect and the three-dimensional effect after printing.

[0048] The main idea of ​​this invention is to prepare a monomer mixture by mixing monomers, then adding a photopolymerization initiator and a drying accelerator to it, and finally curing it with an electron beam after printing. This significantly improves the curing efficiency, allowing the ink to cure within 1 / 20 of the printing time. A larger amount of ink can be coated during the printing process, resulting in an excellent three-dimensional effect. Furthermore, the monomer mixture prepared from the three monomers, with the help of vegetable oil and a diluent, achieves suitable ink flowability, ensuring that the ink does not immediately flow and disperse to both sides after coating.

[0049] The monomer mixture of the present invention uses polyester film powder, tripropylene glycol diacrylate and trimethylolpropane triacrylate in a ratio of 1:5:2, and the pH value of the monomer mixture is 4 to 6.

[0050] This is mainly because photoinitiating polymerizers and drying accelerators need to be added. After adding photoinitiating polymerizers and drying accelerators to the monomer, they can easily affect the yellowing rate of the ink. In addition, the final curing process requires electron beam irradiation. Therefore, if too many photoinitiating polymerizers and drying accelerators are added, or if the monomer has poor anti-yellowing ability, it can easily lead to large color differences in the final printed product and poor printing effect.

[0051] This invention uses a mixture of polyester film powder, tripropylene glycol diacrylate, and trimethylolpropane triacrylate. The synergistic effect of these three components can greatly improve the ink's resistance to yellowing. In addition, since it is necessary to strictly control the dosage of photoinitiator and drying accelerator, this monomer mixture can improve the ink's drying rate, making up for the lack of photoinitiator and drying accelerator dosages, thereby achieving excellent curing effect.

[0052] In this invention, the photoinitiating desiccant comprises benzoin ether and benzophenone in a weight ratio of 1:2. Benzophenone exhibits good synergistic effects with the drying accelerator, making it less likely to bind with the drying accelerator and accelerate the yellowing reaction. However, benzophenone has relatively low photosensitive reaction efficiency. Therefore, its use in combination with a portion of benzoin ether optimizes the curing efficiency without exacerbating the yellowing reaction.

[0053] Organic pigments consist of pearlescent pigments and fillers, with pearlescent pigments accounting for 50-70% of the organic pigment weight. When printing water droplet effects, the ink needs to possess good color and reflectivity. Pearlescent pigments are mainly composed of anatase or rutile titanium dioxide coated with mica flakes, capable of exhibiting a variety of delicate and soft silvery-white lusters. Therefore, adding pearlescent pigments can enhance the water droplet effect on the paper surface.

[0054] This invention also uses bronze powder with a particle size of 15–20 μm. Adding bronze powder enhances the metallic texture and shine of the printed ink. When printing embroidery effects, adding bronze powder improves the layering of the print, thereby optimizing the embroidery effect and improving the gloss of the print.

[0055] The diluent used in this invention is water or ethanol, with an ethanol concentration of 70%. Besides improving the ink's resistance to yellowing, monomer mixtures also reduce its fluidity, thus increasing its viscosity. Therefore, the monomer mixture itself has extremely high viscosity and requires the addition of a diluent. This invention uses water and ethanol as diluents, which reduces viscosity while simultaneously reducing ink toxicity, improving environmental friendliness, minimizing skin irritation, and enhancing safety.

[0056] The vegetable oils used in this invention are soybean oil methyl ester, soybean oil ethyl ester, soybean oil isobutyl ester, palm oil methyl ester, palm oil ethyl ester, palm oil isobutyl ester, rapeseed oil methyl ester, rapeseed oil ethyl ester, rapeseed oil isobutyl ester, methyl oleate, fatty acid ethyl ester, triglyceride citrate, or trimethyl citrate. Adding vegetable oil can also adjust the fluidity of the ink and increase its surface tension, making it less likely for the ink to flow to both sides after printing.

[0057] In this invention, the stabilizer is at least one of butyl hydroxybenzoic acid or Hals stabilizer. During printing, the printing temperature is 22–26°C and the relative humidity is 56–58%. After printing, the ink is cured by electron beam irradiation for 0.5 seconds.

[0058] Using electron beam irradiation on ink can significantly shorten the ink curing time. Electron beam processing is a cold processing method, consuming less energy and releasing less heat, with less odor. Combined with monomer mixtures, ink curing can be achieved within 1 / 20 of a second. Furthermore, printing temperature and humidity need to be strictly controlled. Excessive humidity can easily cause ink discoloration and paper deformation, leading to misregistration; too low humidity can easily cause static electricity.

[0059] The prepared inks were tested under the conditions of each embodiment in Table 1, and the test results are shown in Table 2.

[0060] Table 1. Content of each component in inks from different embodiments

[0061]

[0062] Table 2 Ink Performance Test Table in Different Examples

[0063]

[0064] As shown in Table 2, the ink in Example 6 has the best performance and is suitable for printing embroidery or water droplet effects on the surface of paper.

[0065] Table 3. Content of each component in the inks of different embodiments

[0066]

[0067] Table 4 Ink Performance Test Table in Different Examples

[0068]

[0069] The ink used in this invention can print three-dimensional effects on paper, such as embroidery or water droplets, similar to those on woven fabric. After curing, the ink has strong abrasion resistance, achieving more than 100 abrasion tests on a grinding wheel. It also has excellent adhesion, fast curing speed, and excellent three-dimensional effect, producing superior embroidery and water droplet effects. Furthermore, the overall material is relatively environmentally friendly and suitable for large-scale applications.

[0070] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A special ink which can be used to print the effect of embroidery or water drops on the surface of paper, characterized in that, The ink comprises the following components by weight: a monomer mixture 35-55 parts an organic pigment 17-28 parts a photopolymerization initiator 0.4-1.6 parts a diluent 5-15 parts a stabilizer 3-7 parts bronze powder 12-18 parts a vegetable oil 3-5 parts a drying accelerator 1.5-2 parts The monomer mixture comprises polyester film micro powder, tripropylene glycol diacrylate and trimethylolpropane triacrylate in a weight ratio of 1:5:2; the organic pigment is pearl pigment and filler; the ink is cured by electron beam after printing, and the electron beam irradiation time is 0.5s; the photopolymerization initiator comprises benzoin ethyl ether and benzophenone in a weight ratio of 1:2; the pearl pigment accounts for 50-70% of the weight of the organic pigment; the pearl pigment is mica flake coated with anatase or rutile titanium dioxide; the bronze powder has a particle size of 15-20μm.

2. A special ink for printing embroidery or water drop effect on paper surface as claimed in claim 1 wherein: The diluent is water or ethanol, and the ethanol concentration is 70%.

3. A special ink for printing embroidery or water drop effect on paper surface as claimed in claim 1 wherein: The vegetable oil is soybean oil methyl ester, soybean oil ethyl ester, soybean oil isobutyl ester, palm oil methyl ester, palm oil ethyl ester, palm oil isobutyl ester, rapeseed oil methyl ester, rapeseed oil ethyl ester, rapeseed oil isobutyl ester, methyl oleate, fatty acid ethyl ester or trimethyl citrate.

4. A special ink for printing embroidery or water drop effect on paper surface as claimed in claim 1 wherein: The stabilizer is at least one of butyl hydroxy benzoic acid or Hals stabilizer.

5. A special ink for printing embroidery or water drop effect on paper surface as claimed in claim 1 wherein: The ink is printed at a printing temperature of 22-26℃ and a relative humidity of 56-58%.

6. A special ink for printing embroidery or water drop effect on paper surface as claimed in claim 1 wherein: The pH value of the monomer mixture is 4-6.

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