A quick-drying low-odor environment-friendly special ink for ultraviolet curing and a preparation method thereof

Abstract

The application relates to the technical field of inks, in particular to quick-drying low-odor environment-friendly special ultraviolet light curing ink and a preparation method thereof, which comprises the following preparation raw materials in parts by weight: glycidyl acrylate modified rosin resin 20-30 parts, organic silicon modified alkyd resin 15-25 parts, filler 10-15 parts, pigment 5-7 parts, photoinitiator 1-4 parts, dispersant 1-2 parts, defoaming agent 0.5-1 part, antioxidant 1-2 parts, solvent 10-20 parts and silane coupling agent 0-3 parts; the solvent comprises water-soluble solvent and water; the preparation method comprises the steps of mixing the raw materials and grinding. The quick-drying low-odor environment-friendly special ultraviolet light curing ink has high gloss, good friction resistance and adhesion, reduces environmental pollution problems, and improves the curing speed of the water-based ink.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of inks, in particular to a quick-drying low-odor environmentally-friendly special UV-cured ink and a preparation method thereof. BACKGROUND

[0002] UV-cured ink (UV for short) is an ink that is cured and dried under the irradiation of ultraviolet light. UV ink is widely used due to its fast curing speed, high gloss, wear resistance, water resistance and other advantages.

[0003] However, traditional UV ink cleaning requires a special cleaning agent, and a large internal stress is generated due to internal component cross-linking polymerization during the curing process, which leads to incomplete curing and poor adhesion, and the UV ink is sensitive to the environment, is easily affected by stray ultraviolet light, and may be prematurely cross-linked to cause nozzle blockage. In addition, the shelf life of the UV ink is relatively short, usually about half a year, and in addition, the UV ink contains active diluents, which are irritating to the skin and mucous membranes of the human body.

[0004] Water-based UV ink can improve the problems of special cleaning agents and poor adhesion, and the environmentally friendly water replaces the monomers that are harmful to the human body in traditional UV ink, thereby reducing environmental pollution. However, the commonly used water-based UV ink usually uses unsaturated polyester resin and epoxy acrylate resin as the main resin, and the drying speed is slow, the ink thixotropy is not enough, and it cannot meet the requirements of offset printing ink. SUMMARY

[0005] The application aims to at least overcome one of the defects of the prior art, and provides a quick-drying low-odor environmentally-friendly special UV-cured ink and a preparation method thereof. The ink has high gloss, wear resistance, good adhesion, reduces environmental pollution, and improves the curing speed of water-based ink.

[0006] In a first aspect, the embodiments of the application provide a quick-drying low-odor environmentally-friendly special UV-cured ink, which is implemented by the following technical solutions:

[0007] A quick-drying low-odor environmentally-friendly special UV-cured ink, which comprises the following preparation raw materials by weight:

[0008] glycidyl acrylate modified rosin resin 20-30 parts, organic silicon modified alkyd resin 15-25 parts, filler 10-15 parts, pigment 5-7 parts, photoinitiator 1-4 parts, dispersant 1-2 parts, defoaming agent 0.5-1 part, antioxidant 1-2 parts, solvent 10-20 parts, and silane coupling agent 0-3 parts.

[0009] The solvent comprises a water-soluble solvent and water.

[0010] The fast-drying, low-odor, environmentally friendly UV-curable ink according to the embodiments of this application has at least the following beneficial effects:

[0011] This application uses a combination of silicone-modified alkyd resin and glycidyl acrylate-modified rosin resin as binders. The silicone-modified alkyd resin and glycidyl acrylate-modified rosin resin are rich in active groups such as carbon-carbon double bonds, thiol groups, carboxyl groups, and hydroxyl groups, which can be rapidly cured under heating or photoinitiation and have a high drying speed. When combined with printing substrates, they can also improve the adhesion of inks. At the same time, the combination of silicone and glycidyl acrylate can improve the water resistance, chemical corrosion resistance, and abrasion resistance of inks.

[0012] During the etching process of the ink in this application on the printing substrate, the glycidyl acrylate modified rosin resin can penetrate and entangle with the printing substrate, which can significantly improve the adhesion between the ink and the printing substrate. Moreover, during the cross-linking process, the glycidyl acrylate modified rosin resin can also form a dense network structure, thereby improving the hardness of the ink film.

[0013] The silicone-modified alkyd resin of this application retains the flexibility and adhesion of alkyd resin, while also possessing the heat resistance and water resistance of silicone resin. The silicone-modified alkyd resin has good miscibility with the aforementioned pigment particles, enabling the pigments to be uniformly wetted. This maintains the dispersion of pigment particles in the ink system, which is beneficial for improving the storage stability of the ink and the color saturation during printing.

[0014] According to some embodiments of this application, the viscosity of the silicone-modified alkyd resin is 350-450 mPa·s, for example, the viscosity of the silicone-modified alkyd resin is 400 mPa·s. The viscosity of the resin must be controlled within a suitable range. In printing, if the viscosity is too low, the ink transfers quickly, easily causing problems such as light color, large dot gain, distortion of highlight dots, and uneven ink transfer. If the viscosity is too high, the ink transfer is slow, which easily affects the transfer performance of the anilox roller, resulting in uneven ink color, sometimes insufficient color printing, and problems such as dirty printing plates and smeared printing plates.

[0015] According to some embodiments of this application, the filler includes wax powder. Wax powder can enhance the abrasion resistance, smoothness, and post-printing texture of the ink. Further, the wax powder includes at least one of polyethylene wax, microcrystalline wax, paraffin wax, or polytetrafluoroethylene wax.

[0016] Furthermore, the filler also includes at least one of titanium dioxide, barium sulfate, calcium carbonate, organobentonite, and fumed silica. The addition of the filler allows for good bonding with the alkyd resin, improving the density of the coating film and enhancing the ink's adhesion, abrasion resistance, and mechanical properties. Even further, the filler also includes fumed silica.

[0017] Furthermore, the filler is a mixture of wax powder and fumed silica at a weight ratio of 1:(4-6), for example, the filler is a mixture of wax powder and fumed silica at a weight ratio of 1:5.

[0018] According to some embodiments of this application, the particle size of the filler is 50-1000 nm.

[0019] According to some embodiments of this application, the solvent includes a water-soluble solvent and water. Using a water-soluble solvent mixed with water can enhance the compatibility of pigments with water-based inks.

[0020] According to some embodiments of this application, the water-soluble solvent includes at least one of propylene glycol, ethanol, glycerol, ethylene glycol, 1,3-butanediol, triethylene glycol, glycerol, and diethanolamine.

[0021] According to some embodiments of this application, the water in the solvent is deionized water. Deionized water is free of impurities and is less prone to turbidity or discoloration during the preparation of fast-drying, low-odor, environmentally friendly UV-curable inks.

[0022] According to some embodiments of this application, the weight ratio of the water-soluble solvent to water is (1-5):1.

[0023] According to some embodiments of this application, the pigment includes at least one of magenta, phthalocyanine blue, benzidine yellow, carbon black, and titanium dioxide.

[0024] Furthermore, the pigment has a particle size of 0.05-0.5 μm. Within this particle size range, the pigment exhibits superior tinting strength, gloss, hiding power, and weather resistance.

[0025] According to some embodiments of this application, the antioxidant is selected from at least one of 2,6-di-tert-butyl-p-cresol, tert-butylhydroquinone, butylated hydroxyanisole, hydroquinone, or o-methylhydroquinone. The antioxidant in this application can increase the shelf life of fast-drying, low-odor, environmentally friendly UV-curable inks, maintain the activity of functional groups in the ink, and improve the ink curing effect.

[0026] According to some embodiments of this application, the photoinitiator includes at least two of acylphosphine oxides, α-hydroxy ketone derivatives, azo ketal derivatives, amine alkyl phenyl ketones, and benzoyl carbamates.

[0027] Furthermore, the photoinitiator includes (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and methyl benzoylformate.

[0028] Methyl benzoylformate has good resistance to yellowing. Phenylated bis(2,4,6-trimethylbenzoyl)phosphine oxide and (2,4,6-trimethylbenzoyl)diphenylphosphine oxide can solve the problem of ink surface drying and promote deep curing of ink. The combination of the three can improve the film formation speed and film quality of ink film.

[0029] Furthermore, the amounts of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and methyl benzoate are in a weight ratio of 1:(0.5-1):(2-4), for example, the amounts of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and methyl benzoate are in a weight ratio of 1:1:3.

[0030] This formulation enhances the synergistic effect of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and methyl benzoylformate, improving the film-forming effect of the ink. If the proportion of methyl benzoylformate is too low, it will affect the curing speed of the ink and result in poor yellowing resistance, affecting color. If the proportions of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide are too low, it will affect the deep curing effect of the ink, impacting adhesion and abrasion resistance. Only when the proportions of the three are appropriate can the film-forming speed and film-forming quality of the ink achieve the best results.

[0031] According to some embodiments of this application, the dispersant includes at least one of anionic water-soluble dispersant or nonionic water-soluble dispersant.

[0032] According to some embodiments of this application, the defoamer includes at least one of silicone oils, fatty alcohols, polyethers, mineral oils, and delaminated silicates.

[0033] Furthermore, the defoamer includes silicone oil-based and polyether-based defoamers. The combination of silicone oil-based and polyether-based defoamers can form a covering film on the liquid surface, preventing the formation and aggregation of bubbles, and improving the efficiency of eliminating bubbles in the ink.

[0034] According to some embodiments of this application, the amount of silane coupling agent used in the preparation raw materials is 1-3 parts by weight.

[0035] Silane coupling agents have good compatibility with organosilicon-modified alkyd resins, enabling the ink system to be uniformly dispersed in the organosilicon-modified alkyd resins, improving the dispersion coefficient of pigments, and making the ink colors saturated and bright. Fillers and antioxidants, when combined with silane coupling agents, improve the ink's abrasion resistance and oxidation resistance.

[0036] According to some embodiments of this application, the silane coupling agent includes at least one of methacryloyloxypropyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, and glycidyl etheroxypropyltrimethoxysilane.

[0037] Secondly, this application provides a method for preparing the above-mentioned fast-drying, low-odor, environmentally friendly UV-curable ink, which is achieved through the following technical solution:

[0038] The preparation method of the above-mentioned fast-drying, low-odor, environmentally friendly UV-curable ink includes the following steps:

[0039] (1) Mix and stir the glycidyl acrylate modified rosin resin, organosilicon modified alkyd resin, solvent and photoinitiator to obtain semi-finished product A;

[0040] (2) Add the pigment, filler, dispersant, defoamer, antioxidant and silane coupling agent to semi-finished product A, mix evenly to obtain semi-finished product B;

[0041] (3) Grind the semi-finished product B to a fineness of less than 5 micrometers to obtain a fast-drying, low-odor, environmentally friendly UV-curable special ink.

[0042] The preparation method of the fast-drying, low-odor, environmentally friendly UV-curable special ink according to the embodiments of this application has at least the following beneficial effects:

[0043] The preparation method of this application is simple, does not require complex production equipment, has low cost, is pollution-free in the manufacturing process, emits no toxic substances, does not harm the health of operators, and is suitable for industrial production.

[0044] According to some embodiments of this application, the stirring speed in step (1) is 1000-2000 r / min.

[0045] According to some embodiments of this application, the stirring time in step (1) is 10-20 min.

[0046] According to some embodiments of this application, the mixing method in step (2) includes at least one of ultrasonic dispersion and stirring.

[0047] According to some embodiments of this application, the mixing temperature in step (2) is 70-90°C.

[0048] According to some embodiments of this application, the mixing time in step (2) is 1-3 hours.

[0049] According to some embodiments of this application, the grinding in step (3) includes a first grinding and a second grinding.

[0050] Furthermore, the first grinding is performed using a bead mill.

[0051] Furthermore, the second grinding is performed using a three-roll mill.

[0052] Furthermore, the first grinding process also includes vacuum degassing and stirring.

[0053] Furthermore, the vacuum degassing and stirring time is 10-30 minutes.

[0054] Thirdly, embodiments of this application provide the application of the fast-drying, low-odor, environmentally friendly UV-curable ink in offset printing. Printing using the fast-drying, low-odor, environmentally friendly UV-curable ink of this application results in rapid ink curing, high font gloss, strong lettering adhesion, and resistance to water, abrasion, and fading. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this application clearer, a further detailed description will be provided below in conjunction with specific embodiments. The embodiments described herein are merely some examples of this application and should not be construed as limiting the scope of protection of this application.

[0056] In the specific embodiments of this application, the organosilicon-modified alkyd resin is selected from Shin-Etsu Chemical's KR-5206, the pigment is selected from Degussa Carbon Black SB4, the fumed silica in the filler is selected from Merck's S5130, the wax powder in the filler is selected from Nanjing Tianshi New Material Technology Co., Ltd.'s polyethylene wax PEW-0330, the dispersant is selected from Guangdong Taichen New Material Co., Ltd.'s AG-137, the defoamer is selected from Foshan Nanhai Datian Chemical Co., Ltd.'s DT-250, the antioxidant is selected from Zhengzhou Dewang Chemical's T501, and the silane coupling agent is selected from Hubei Wuhan University Organosilicon New Material Co., Ltd.'s KH-570.

[0057] Example of preparation of modified rosin resin

[0058] The preparation was carried out in accordance with the patent application document with publication number CN107602768A. The specific preparation steps are as follows:

[0059] S1. Dissolve 6.530 g (0.016 mol) of maleic anhydride and 0.947 g (0.008 mol) of hexamethylenediamine in 30 mL of anhydrous ethanol. Add the hexamethylenediamine-anhydrous ethanol solution dropwise to the maleic anhydride-anhydrous ethanol solution under stirring at room temperature. Heat to 85 °C under nitrogen atmosphere and reflux for 10 h. After the reaction is complete, filter to remove impurities, pour into water to precipitate, filter and vacuum dry to obtain bismaleic anhydride bisamide acid.

[0060] S2. In a 250 ml three-necked flask, 5.000 g (0.005 mol) of bismaleic anhydride diammoniacid obtained in step S1, 1.550 g (0.010 mol) of glycidyl acrylate, 0.004 g of p-hydroxyanisole, and 0.029 g of cetyltrimethylammonium bromide were dissolved in 50 ml of dried DMF. The mixture was heated to 110 °C and reacted for 8 h under a nitrogen atmosphere. After the reaction was completed, the impurities in the solution were removed by filtration. The filtrate was poured into n-hexane and the supernatant was removed. The solution was then dissolved in ethyl acetate and poured into n-hexane to precipitate a yellow viscous substance. The supernatant was removed and the solution was dried under vacuum to obtain glycidyl acrylate modified rosin resin. Example 1

[0061] Preparation of fast-drying, low-odor, environmentally friendly UV-curable ink: Raw materials selected by weight are as follows: 20 parts glycidyl acrylate modified rosin resin, 25 parts organosilicon modified alkyd resin, 5 parts pigment, 10 parts filler, 3 parts photoinitiator, 1 part dispersant, 1 part defoamer, 1 part antioxidant, and 15 parts solvent; wherein the photoinitiator is a mixture of photoinitiator TPO, photoinitiator 819, and photoinitiator MBF in a weight ratio of 1:1:3, the solvent is a mixture of propylene glycol and deionized water in a weight ratio of 2:1, and the filler is a mixture of wax powder and fumed silica in a weight ratio of 1:5.

[0062] (1) The acrylate-modified rosin resin, organosilicon-modified alkyd resin, solvent, and photoinitiator are mixed and dispersed in a high-speed mixer until completely dissolved to obtain semi-finished product A, wherein the stirring speed is 1500 r / min and the time is 10 min;

[0063] (2) Add the filler, pigment, dispersant, defoamer and antioxidant to semi-finished product A and mix them. Disperse the mixture ultrasonically at 80°C for 2 hours to obtain semi-finished product B.

[0064] (3) After grinding the semi-finished product B in a bead mill, vacuum degassing and stirring for 20 minutes, then grinding it in a three-roll mill until the fineness is below 5 micrometers, to obtain a fast-drying, low-odor, environmentally friendly UV-curable special ink. Example 2

[0065] Preparation of fast-drying, low-odor, environmentally friendly UV-curable ink: Raw materials selected by weight are as follows: 30 parts glycidyl acrylate modified rosin resin, 15 parts organosilicon modified alkyd resin, 7 parts pigment, 15 parts filler, 4 parts photoinitiator, 2 parts dispersant, 0.5 parts defoamer, 2 parts antioxidant, 20 parts solvent, and 3 parts silane coupling agent; wherein the photoinitiator is a mixture of photoinitiator TPO, photoinitiator 819 and photoinitiator MBF in a weight ratio of 1:1:3, the solvent is a mixture of propylene glycol and deionized water in a weight ratio of 2:1, and the filler is a mixture of wax powder and fumed silica in a weight ratio of 1:5.

[0066] (1) The acrylate-modified rosin resin, organosilicon-modified alkyd resin, solvent, and photoinitiator are mixed and dispersed in a high-speed mixer until completely dissolved to obtain semi-finished product A, wherein the stirring speed is 1500 r / min and the time is 10 min;

[0067] (2) Add the filler, pigment, dispersant, defoamer, antioxidant and silane coupling agent to semi-finished product A and mix them. Disperse the mixture ultrasonically at 80°C for 2 hours to obtain semi-finished product B.

[0068] (3) After grinding the semi-finished product B in a bead mill, vacuum degassing and stirring for 20 minutes, then grinding it in a three-roll mill until the fineness is below 5 micrometers, to obtain a fast-drying, low-odor, environmentally friendly UV-curable special ink. Example 3

[0069] Preparation of fast-drying, low-odor, environmentally friendly UV-curable ink: Raw materials selected by weight are as follows: 25 parts glycidyl acrylate modified rosin resin, 20 parts organosilicon modified alkyd resin, 6 parts pigment, 12 parts filler, 1 part photoinitiator, 1 part dispersant, 1 part defoamer, 1 part antioxidant, 10 parts solvent, and 1 part silane coupling agent; wherein the photoinitiator is a mixture of photoinitiator TPO, photoinitiator 819 and photoinitiator MBF in a weight ratio of 1:1:3, the solvent is a mixture of propylene glycol and deionized water in a weight ratio of 2:1, and the filler is a mixture of wax powder and fumed silica in a weight ratio of 1:5.

[0070] (1) The acrylate-modified rosin resin, organosilicon-modified alkyd resin, solvent, and photoinitiator are mixed and dispersed in a high-speed mixer until completely dissolved to obtain semi-finished product A, wherein the stirring speed is 1500 r / min and the time is 10 min;

[0071] (2) Add the filler, pigment, dispersant, defoamer, antioxidant and silane coupling agent to semi-finished product A and mix them. Disperse the mixture ultrasonically at 80°C for 2 hours to obtain semi-finished product B.

[0072] (3) After grinding the semi-finished product B in a bead mill, vacuum degassing and stirring for 20 minutes, then grinding it in a three-roll mill until the fineness is below 5 micrometers, to obtain a fast-drying, low-odor, environmentally friendly UV-curable special ink. Example 4

[0073] Preparation of fast-drying, low-odor, environmentally friendly UV-curable ink: Raw materials selected by weight are as follows: 25 parts glycidyl acrylate modified rosin resin, 20 parts organosilicon modified alkyd resin, 6 parts pigment, 12 parts filler, 3 parts photoinitiator, 1.5 parts dispersant, 1 part defoamer, 1 part antioxidant, 16 parts solvent, and 2 parts silane coupling agent; wherein the photoinitiator is a mixture of photoinitiator TPO, photoinitiator 819 and photoinitiator MBF in a weight ratio of 1:1:3, the solvent is a mixture of propylene glycol and deionized water in a weight ratio of 2:1, and the filler is a mixture of wax powder and fumed silica in a weight ratio of 1:5.

[0074] (1) The acrylate-modified rosin resin, organosilicon-modified alkyd resin, solvent, and photoinitiator are mixed and dispersed in a high-speed mixer until completely dissolved to obtain semi-finished product A, wherein the stirring speed is 1500 r / min and the time is 10 min;

[0075] (2) Add the filler, pigment, dispersant, defoamer, antioxidant and silane coupling agent to semi-finished product A and mix them. Disperse the mixture ultrasonically at 80°C for 2 hours to obtain semi-finished product B.

[0076] (3) After grinding the semi-finished product B in a bead mill, vacuum degassing and stirring for 20 minutes, then grinding it in a three-roll mill until the fineness is below 5 micrometers, to obtain a fast-drying, low-odor, environmentally friendly UV-curable special ink.

[0077] Comparative Example 1

[0078] Preparation of UV-curable ink: Raw materials selected by weight are as follows: 25 parts glycidyl acrylate modified rosin resin, 20 parts Jiangsu Sanmu 3370C alkyd resin, 6 parts pigment, 12 parts filler, 3 parts photoinitiator, 1.5 parts dispersant, 1 part defoamer, 1 part antioxidant, 16 parts solvent, and 2 parts silane coupling agent; wherein the photoinitiator is a mixture of photoinitiator TPO, photoinitiator 819 and photoinitiator MBF in a weight ratio of 1:1:3, the solvent is a mixture of propylene glycol and deionized water in a weight ratio of 2:1, and the filler is a mixture of wax powder and fumed silica in a weight ratio of 1:5.

[0079] (1) The acrylate-modified rosin resin, Jiangsu Sanmu's 3370C alkyd resin, solvent, and photoinitiator are mixed and dispersed in a high-speed mixer until completely dissolved to obtain semi-finished product A, wherein the stirring speed is 1500 r / min and the time is 10 min.

[0080] (2) Add the filler, pigment, dispersant, defoamer, antioxidant and silane coupling agent to semi-finished product A and mix them. Disperse the mixture ultrasonically at 80°C for 2 hours to obtain semi-finished product B.

[0081] (3) After grinding the semi-finished product B in a bead mill, vacuum degassing and stirring for 20 minutes, then grinding it in a three-roll mill until the fineness is below 5 micrometers, to obtain UV-curable ink.

[0082] Comparative Example 2

[0083] Preparation of UV-curable ink: Raw materials selected by weight are as follows: 25 parts of rosin from Guangzhou Songbao Chemical, 20 parts of silicone-modified alkyd resin, 6 parts of pigment, 12 parts of filler, 3 parts of photoinitiator, 1.5 parts of dispersant, 1 part of defoamer, 1 part of antioxidant, 16 parts of solvent, and 2 parts of silane coupling agent; wherein the photoinitiator is a mixture of photoinitiator TPO, photoinitiator 819 and photoinitiator MBF in a weight ratio of 1:1:3, the solvent is a mixture of propylene glycol and deionized water in a weight ratio of 2:1, and the filler is a mixture of wax powder and fumed silica in a weight ratio of 1:5.

[0084] (1) Mix the rosin, organosilicon modified alkyd resin, solvent and photoinitiator of Guangzhou Songbao Chemical, and disperse them in a high-speed mixer until they are completely dissolved to obtain semi-finished product A, wherein the stirring speed is 1500 r / min and the time is 10 min.

[0085] (2) Add the filler, pigment, dispersant, defoamer, antioxidant and silane coupling agent to semi-finished product A and mix them. Disperse the mixture ultrasonically at 80°C for 2 hours to obtain semi-finished product B.

[0086] (3) After grinding the semi-finished product B in a bead mill, vacuum degassing and stirring for 20 minutes, then grinding it in a three-roll mill until the fineness is below 5 micrometers, to obtain UV-curable ink.

[0087] Comparative Example 3

[0088] Preparation of UV-curable ink: Raw materials selected by weight are as follows: 25 parts glycidyl acrylate modified rosin resin, 20 parts silicone modified alkyd resin, 6 parts pigment, 12 parts filler, 3 parts photoinitiator, 1.5 parts dispersant, 1 part defoamer, 1 part antioxidant, 16 parts solvent, and 2 parts silane coupling agent; wherein the photoinitiator is a mixture of photoinitiator TPO and photoinitiator 819 in a weight ratio of 1:1, the solvent is a mixture of propylene glycol and deionized water in a weight ratio of 2:1, and the filler is a mixture of wax powder and fumed silica in a weight ratio of 1:5.

[0089] (1) The acrylate-modified rosin resin, organosilicon-modified alkyd resin, solvent, and photoinitiator are mixed and dispersed in a high-speed mixer until completely dissolved to obtain semi-finished product A, wherein the stirring speed is 1500 r / min and the time is 10 min;

[0090] (2) Add the filler, pigment, dispersant, defoamer, antioxidant and silane coupling agent to semi-finished product A and mix them. Disperse the mixture ultrasonically at 80°C for 2 hours to obtain semi-finished product B.

[0091] (3) After grinding the semi-finished product B in a bead mill, vacuum degassing and stirring for 20 minutes, then grinding it in a three-roll mill until the fineness is below 5 micrometers, to obtain UV-curable ink.

[0092] Comparative Example 4

[0093] Preparation of UV-curable ink: Raw materials selected by weight are as follows: 25 parts glycidyl acrylate modified rosin resin, 20 parts silicone modified alkyd resin, 6 parts pigment, 12 parts filler, 3 parts photoinitiator, 1.5 parts dispersant, 1 part defoamer, 1 part antioxidant, 16 parts solvent, and 2 parts silane coupling agent; wherein the photoinitiator is photoinitiator MBF, the solvent is a mixture of propylene glycol and deionized water at a weight ratio of 2:1, and the filler is a mixture of wax powder and fumed silica at a weight ratio of 1:5.

[0094] (1) The acrylate-modified rosin resin, organosilicon-modified alkyd resin, solvent, and photoinitiator are mixed and dispersed in a high-speed mixer until completely dissolved to obtain semi-finished product A, wherein the stirring speed is 1500 r / min and the time is 10 min;

[0095] (2) Add the filler, pigment, dispersant, defoamer, antioxidant and silane coupling agent to semi-finished product A and mix them. Disperse the mixture ultrasonically at 80°C for 2 hours to obtain semi-finished product B.

[0096] (3) After grinding the semi-finished product B in a bead mill, vacuum degassing and stirring for 20 minutes, then grinding it in a three-roll mill until the fineness is below 5 micrometers, to obtain UV-curable ink.

[0097] Comparative Example 5

[0098] Commonly available water-based UV inks.

[0099] The inks prepared in Examples 1-4 and Comparative Examples 1-5 were printed onto offset paper using offset printing. The relevant properties of the inks and the printed materials were tested using the following methods:

[0100] Colors are tested according to GB / T 13217.1-2020 (requirement ≥ level 4).

[0101] Fineness is tested according to the standard QB / T 2624-2012 (requirement ≤5μm).

[0102] The viscosity was tested according to GB / T 18723-2002 (requirements 7.0-16.0).

[0103] The adhesion strength was tested according to the standard GB / T 13217.1-2009 (requirement ≥95%).

[0104] Dryness was tested according to the standard QB / T 2826-2017 (requirement ≤ 3 times).

[0105] The test method for abrasion resistance is as follows: a friction tester with a left-right swinging motion, and the test conditions are 4 psi / 50 cycles. The evaluation criteria for abrasion resistance are divided into 5 levels, from poorest to best.

[0106] Performance test data are shown in Table 1 below:

[0107] Table 1

[0108]

[0109] As can be seen from Table 1, the fast-drying, low-odor, environmentally friendly UV-curable special inks of Examples 1-4 of this application have good performance in all aspects. Under the specific ratio of raw materials, the color, fineness, viscosity, adhesion, abrasion resistance and drying properties of the prepared inks can all reach a high level.

[0110] In Comparative Example 1, the use of ordinary alkyd resin as raw material resulted in a significant decrease in the color, viscosity, adhesion, abrasion resistance, and drying properties of the prepared ink. The ink performance was clearly inferior to that of the inks prepared in Examples 1-4 of this application. This indicates that the use of silicone-modified alkyd resin is crucial for the fast-drying, low-odor, environmentally friendly UV-curable inks of this application. Changing this combination will have a significant impact on the performance of the prepared ink.

[0111] In Comparative Example 2, the use of ordinary rosin resin as raw material resulted in a significant decrease in the color, viscosity, adhesion, abrasion resistance, and drying properties of the prepared ink. The ink performance was clearly inferior to that of the inks prepared in Examples 1-4 of this application. This indicates that the use of glycidyl acrylate-modified rosin resin is crucial for the fast-drying, low-odor, environmentally friendly UV-curable special ink of this application. Changing this combination will have a significant impact on the performance of the prepared ink. The combination of glycidyl acrylate-modified rosin resin and silicone-modified alkyd resin can significantly improve the ink performance.

[0112] The photoinitiator in the raw materials of Comparative Example 3 was a mixture of photoinitiator TPO and photoinitiator 819 in a weight ratio of 1:1. The color, adhesion, abrasion resistance, and drying properties of the prepared ink were significantly worse. The ink performance was obviously inferior to the inks prepared in Examples 1-4 of this application. This shows that the specific combination of photoinitiator components and dosage is very important for the fast-drying, low-odor, environmentally friendly UV-curable special ink of this application. Changing this combination will affect the photocuring reaction and thus affect the performance of the prepared ink.

[0113] The photoinitiator in the raw materials of Comparative Example 4 was photoinitiator MBF. The viscosity, adhesion, abrasion resistance and drying properties of the prepared ink were significantly worse. The ink performance was obviously not as good as the inks prepared in Examples 1-4 of this application. This shows that the specific combination of photoinitiator components and dosage is very important for the fast-drying, low-odor, environmentally friendly UV curing ink of this application. Changing this combination will affect the photocuring reaction and thus affect the performance of the prepared ink.

[0114] The commercially available water-based UV inks used in Comparative Example 5, as described in the background section, showed that they had a slower drying speed, insufficient thixotropy, and inferior color, fineness, adhesion strength, and abrasion resistance compared to the inks prepared in Examples 1-4 of this application. They were not suitable for the requirements of offset printing inks.

[0115] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions or alterations can be made to these embodiments without departing from the principles and spirit of this application, and the technical solutions resulting from such changes, modifications, substitutions or alterations will all fall within the protection scope of this application.

Claims

1. A fast-drying, low-odor, environmentally friendly UV-curable ink, characterized in that, The preparation raw materials are prepared in the following parts by weight: 20-30 parts of glycidyl acrylate modified rosin resin, 15-25 parts of organosilicon modified alkyd resin, 10-15 parts of filler, 5-7 parts of pigment, 1-4 parts of photoinitiator, 1-2 parts of dispersant, 0.5-1 part of defoamer, 1-2 parts of antioxidant, 10-20 parts of solvent, and 0-3 parts of silane coupling agent. The solvent includes a water-soluble solvent and water; The viscosity of the organosilicon-modified alkyd resin is 350-450 mPa·s; The photoinitiators include (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and methyl benzoylformate; The amounts of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, and methyl benzoate are in a weight ratio of 1:(0.5-1):(2-4). The amounts of the water-soluble solvent and the water are in a weight ratio of (1-5):

1.

2. The fast-drying, low-odor, environmentally friendly UV-curable ink according to claim 1, characterized in that, The filler includes wax powder.

3. The fast-drying, low-odor, environmentally friendly UV-curable ink according to claim 2, characterized in that, The filler also includes at least one of titanium dioxide, barium sulfate, calcium carbonate, organobentonite, and fumed silica.

4. The fast-drying, low-odor, environmentally friendly UV-curable ink according to claim 2 or 3, characterized in that, The particle size of the filler is 50-1000 nm.

5. A method for preparing a fast-drying, low-odor, environmentally friendly UV-curable ink as described in any one of claims 1 to 4, characterized in that, Includes the following steps: (1) The glycidyl acrylate modified rosin resin, organosilicon modified alkyd resin, solvent and photoinitiator are mixed and stirred to obtain semi-finished product A; (2) Add the pigment, filler, dispersant, defoamer, antioxidant and silane coupling agent to semi-finished product A, mix evenly to obtain semi-finished product B; (3) Grind the semi-finished product B to a fineness of less than 5 micrometers to obtain a fast-drying, low-odor, environmentally friendly UV-curable special ink.

6. The application of the fast-drying, low-odor, environmentally friendly UV-curable ink as described in any one of claims 1 to 4, or the fast-drying, low-odor, environmentally friendly UV-curable ink prepared by the preparation method described in claim 5, in offset printing.

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