A water-based alkyd resin binder for engraving gravure ink, its preparation method and application

Abstract

This invention relates to the field of ink technology, and in particular to a water-based alkyd resin binder for engraving gravure ink, its preparation method, and its application. It is prepared from components comprising the following weight percentages: 5-40% vegetable oil fatty acids, 5-40% polybasic acids, 5-40% polyols, 0.01-1% catalyst, 1-30% tackifier, 1-20% acid anhydride, 1-15% alkaline neutralizer, and 1-15% water. The water-based alkyd resin binder for engraving gravure ink of this invention does not contain organic solvents. The organic solvent content of the engraving gravure ink prepared using this binder can be reduced by more than 30%. During the ink printing process, the ink has high viscosity and good transfer properties. Alkaline substances and surfactants can be eliminated from the wiping solution; clean water can be used directly for wiping, greatly reducing the difficulty and cost of waste liquid post-treatment.

Description

Technical Field

[0001] This invention relates to the field of ink technology, and in particular to a water-based alkyd resin binder for engraving gravure ink, its preparation method, and its application. Background Technology

[0002] With the increasing emphasis on environmental protection by the state, the national standard "Emission Standard of Air Pollutants for Coatings, Inks and Adhesives Industry" has raised the requirements for volatile organic compound (VOC) emissions from ink production and use enterprises, with the printing and ink industry being a key focus. At the same time, the Ministry of Environmental Protection has continuously issued relevant standards to encourage the gradual improvement of the environmental performance of inks. In 2016 and 2018, standards such as "Technical Requirements for Offset Printing Inks for Environmental Labeling Products" and "Technical Requirements for Gravure and Flexographic Printing Inks for Environmental Labeling Products" were successively issued, which clearly stipulate the types and contents of volatile organic compounds (VOCs) in inks. Whether from the perspective of enterprise survival, ensuring the supply of inks in the industry, or fulfilling social responsibility, improving the environmental performance of inks is an inevitable trend.

[0003] As one of the core materials of ink, the binder plays a crucial role in the performance of ink. It is the base material for grinding pigments, the main mobile phase, and the film-forming substance after ink drying, directly determining the ink's performance and printing effect. Alkyd resin binders possess high pigment wetting, adhesion, elasticity, and excellent physicochemical resistance, making them one of the most important binders in gravure printing inks. Commonly used alkyd resin binders require the introduction of a large amount of volatile organic solvents (mainly hydrocarbons, alcohols, ethers, ketones, and esters) during the design process to ensure that the gravure printing ink has excellent transfer properties, pattern line reproduction, penetration and drying, and non-smudging properties during printing. These volatile solvents have potential impacts on the working environment and health of employees during ink production and use.

[0004] Waterborne alkyd resin binders typically use water or alkaline aqueous solutions as solvents to replace volatile organic solvents, thereby reducing the organic solvent content of the alkyd resin binder. However, water or alkaline aqueous solutions have better compatibility with alkyd resin binders with lower molecular weights. Generally, waterborne alkyd resins have lower molecular weights, which also results in lower viscosity, thus affecting the transfer and transfer of ink during the printing process.

[0005] In addition, during the engraving and gravure printing process, a cleaning solution containing alkaline substances and surfactants is required to clean the printing plate. A large amount of cleaning waste liquid can only be discharged after collection and treatment, requiring companies to invest a lot of manpower, material resources and financial resources in treatment. Summary of the Invention

[0006] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a water-based alkyd resin binder for engraving gravure ink, its preparation method and application. The water-based alkyd resin binder of this application has low viscosity and high viscosity, and has good compatibility with water. When applied to ink, it greatly reduces the use of volatile organic compounds.

[0007] To achieve the above and other related objectives, one aspect of the present invention provides a water-based alkyd resin binder for engraving gravure inks, wherein the raw materials of the binder, by weight percentage, comprise the following components:

[0008]

[0009] In some embodiments of the present invention, the raw materials of the binder include the following components by weight percentage:

[0010]

[0011] In some embodiments of the present invention, the vegetable oleic acid fat is selected from at least one of tung oil acid, linolenic acid, linoleic acid, lauric acid, palmitic acid, arachidic acid, myristic acid, ricinoleic acid, dehydrated ricinoleic acid, tall oil fatty acid, coconut oil fatty acid, conjugated sunflower oil acid, and soybean oil acid.

[0012] In some embodiments of the present invention, the polybasic acid is selected from at least one of isophthalic acid, phthalic anhydride, tetrahydrophthalic anhydride, maleic anhydride, fumaric acid, maleic acid chloride, malonic acid, succinic acid, azelaic acid, and undecanoic acid. Preferably, the polybasic acid comprises at least two polybasic acids.

[0013] In some embodiments of the present invention, the polyol is selected from at least one of polyethylene glycol, glycerol, trimethylolpropane, bis-trimethylolpropane, trimethylolethane, 1,2,6-hexanetriol, pentaerythritol, dipentaerythritol, xylitol, sorbitol, mannitol, sucritol, polyether polyol, and polyester polyol. Preferably, the functionality of the polyether polyol is ≥2; and / or, the functionality of the polyester polyol is ≥2. More preferably, the polyol comprises at least two polyols.

[0014] In some embodiments of the present invention, the catalyst is selected from one or a mixture of two or more of dibutyltin dilaurate, cobalt naphthenate, cobalt octanoate, potassium oleate, butyl titanate, triethylamine, and stannous octanoate.

[0015] In some embodiments of the present invention, the tackifier is selected from at least one of C5 petroleum resin, C9 petroleum resin, C5 / C9 copolymer petroleum resin, dicyclopentadiene petroleum resin (DCPD), coumarone-indene resin, styrene resin, terpene resin, marinic rosin resin, and polymeric rosin.

[0016] In some embodiments of the present invention, the acid anhydride is selected from at least one of succinic anhydride, maleic anhydride, trans-butenediic anhydride, methyl-trans-butenediic acid, methyl-maleic acid, maleic anhydride, chlorinated maleic acid, trimellitic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, and dodecenylsuccinic anhydride.

[0017] In some embodiments of the present invention, the alkaline neutralizing agent is selected from at least one of triethylamine, tripropylamine, dimethylethylamine, diethanolamine, triethanolamine and dimethylethanolamine, aqueous solution of sodium hydroxide, aqueous solution of potassium hydroxide, aqueous solution of calcium hydroxide, aqueous solution of lithium hydroxide, aqueous solution of sodium carbonate, aqueous solution of potassium carbonate, aqueous solution of sodium bicarbonate, aqueous solution of sodium sulfide, and ammonia.

[0018] A second aspect of the present invention provides a method for preparing a water-based alkyd resin binder for engraving gravure ink, comprising the following steps: 1) reacting vegetable oil fatty acids, polyacids, polyols and catalysts in a first reaction according to a ratio; 2) adding a tackifier and anhydride for a second reaction; 3) finally adding an alkaline neutralizer and water for a third reaction to obtain the water-based alkyd resin binder for engraving gravure ink.

[0019] In some embodiments of the present invention, the first reaction in step 1) is carried out under the protection of an inert gas.

[0020] In some embodiments of the present invention, the reaction temperature of the first reaction in step 1) is 200-240°C and the reaction time is 1-5 hours.

[0021] In some embodiments of the present invention, after the first reaction in step 1), a first cooling is performed before step 2); preferably, the first cooling reaches a temperature of 150-200°C.

[0022] In some embodiments of the present invention, the reaction temperature of the second reaction in step 2) is 150-200°C and the reaction time is 1-3 hours.

[0023] In some embodiments of the present invention, after the second reaction in step 2), a second cooling is performed, followed by step 3); preferably, the second cooling reaches a temperature of 60-100°C.

[0024] In some embodiments of the present invention, the reaction temperature of the third reaction in step 3) is 60-100°C and the reaction time is 1-2 hours.

[0025] The present invention provides a gravure printing ink, comprising an aqueous alkyd resin binder as described above. Detailed Implementation

[0026] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 5-30 and 20-40 are listed for a specific parameter, it is expected that ranges of 5-20 and 30-40 will also be understood. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers.

[0027] Terminology Explanation

[0028] Viscosity is a physical quantity that measures the viscosity of a fluid; inkometer refers to the viscosity of ink. Invention Details

[0030] Typically, in the design of waterborne alkyd resins, the initial high-acid-value alkyd resin has a low molecular weight, which facilitates subsequent neutralization and modification with alkaline aqueous solutions to prepare a stable waterborne alkyd resin. If the molecular weight of the initial high-acid-value resin is too large, the resulting waterborne alkyd resin will become cloudy and have poor storage stability after neutralization and modification with alkaline aqueous solutions. Therefore, currently available waterborne alkyd resins generally have low molecular weight and low viscosity, making them unsuitable for use in engraving and gravure inks. The waterborne alkyd resin of this invention mainly consists of three process steps: first, a basic alkyd resin is designed and synthesized; then, high-acid-value and high-viscosity modification is performed; and finally, alkaline aqueous solution neutralization modification is performed. Through formulation and molecular structure design, the high-acid-value alkyd resin can react with more alkaline aqueous solutions, resulting in a waterborne resin with lower viscosity. At the same time, through formulation compounding, the viscosity of the waterborne alkyd resin is also improved, providing excellent transferability for use in engraving and gravure inks.

[0031] Through extensive experimentation, the inventors of this invention obtained a water-based alkyd resin binder formulation composed of vegetable oleic acid fats, polybasic acids, polyols, catalysts, thickeners, acid anhydrides, alkaline neutralizers, and water. A specific preparation method yielded a water-soluble binder with low viscosity, high viscosity, and excellent water solubility. Therefore, water can be used as a solvent, and it contains no volatile organic solvents, significantly reducing the emission of volatile organic compounds when used in inks. Furthermore, during the ink printing process, the wiping solution does not require alkaline substances or surfactants; it can be applied directly with water, reducing the difficulty and cost of subsequent waste liquid treatment. Moreover, the performance indicators of inks cured using this water-based alkyd resin binder meet the requirements of gravure printing. Based on these findings, this invention was completed.

[0032] The following detailed description discloses the water-based alkyd resin binder, preparation method, and application of the engraving gravure ink of this application.

[0033] The first aspect of the present invention provides an aqueous alkyd resin binder for engraving and gravure inks. The raw materials of the binder, by weight percentage, include the following components: vegetable oleic acid fat, polybasic acid, polyol, catalyst, tackifier, acid anhydride, alkaline neutralizer and water.

[0034] 1) Vegetable oil fatty acids, widely available, are selected from at least one of the following for the binder formulation of this application: tung oil acid, linolenic acid, linoleic acid, lauric acid, palmitic acid, arachidic acid, myristic acid, ricinoleic acid, dehydrated ricinoleic acid, castor oil fatty acids, tall oil fatty acids, coconut oil fatty acids, conjugated selaginellae acid, and soybean oil acid. They can be one, two, or a combination of more than one. Preferably, they are selected from at least one of linoleic acid, ricinoleic acid, castor oil fatty acids, coconut oil fatty acids, or soybean oil acid. More preferably, they are selected from ricinoleic acid or a combination of ricinoleic acid with any of the above-mentioned vegetable oil fatty acids; even more preferably, they are selected from a combination of soybean oil acid with any of the above-mentioned vegetable oil fatty acids.

[0035] In some specific embodiments, the binder material contains 5-40% vegetable oil fatty acids by weight percentage. In some specific embodiments, the vegetable oil fatty acids can be 10-35%, and more specifically, 5-10%, 10-20%, 20-30%, or 30-40%.

[0036] 2) The polyacid, applicable to the binder formulation of this application, is selected from at least one of isophthalic acid, phthalic anhydride, tetrahydrophthalic anhydride, maleic anhydride, fumaric acid, maleic acid chloride, malonic acid, succinic acid, azelaic acid, and undecanoic acid. Preferably, it is selected from at least one of malonic acid, isophthalic acid, succinic acid, phthalic acid, or fumaric acid. More preferably, it is selected from fumaric acid or a combination of fumaric acid with at least one of the above polyacids; more preferably, it is selected from malonic acid or a combination of malonic acid with at least one of the above polyacids; more preferably, it is selected from isophthalic acid or a combination of isophthalic acid with at least one of the above polyacids; even more preferably, it is selected from phthalic acid or a combination of phthalic acid with at least one of the above polyacids.

[0037] In some specific embodiments, the raw materials of the binder, by weight percentage, contain 5-40% polybasic acid. In some specific embodiments, the polybasic acid can be 10-25%, and more specifically, it can be 5-10%, 10-20%, 20-30%, or 30-40%.

[0038] 3) The polyol used in the binder formulation of this application is selected from at least one of polyethylene glycol, glycerol, trimethylolpropane, bis-trimethylolpropane, trimethylolethane, 1,2,6-hexanetriol, pentaerythritol, dipentaerythritol, xylitol, sorbitol, mannitol, sucritol, polyether polyol, and polyester polyol. More preferably, it is selected from at least one of glycerol, sorbitol, polyethylene glycol, pentaerythritol, or polyether polyol. Preferably, the functionality of the polyether polyol is ≥2, optionally ≥3, ≥4, or ≥5. The functionality of the polyester polyol is ≥2, optionally ≥3, ≥4, or ≥5. More preferably, it is selected from pentaerythritol or a combination of pentaerythritol and at least one of the above-mentioned polybasic acids; more preferably, it is selected from pentaerythritol or a combination of pentaerythritol and at least one of the above-mentioned polybasic acids; more preferably, it is selected from polyethylene glycol or a combination of polyethylene glycol and at least one of the above-mentioned polybasic acids; more preferably, it is selected from glycerol or a combination of glycerol and at least one of the above-mentioned polybasic acids.

[0039] In some specific embodiments, the raw materials of the binder, by weight percentage, include 5-40% polyol. In some specific embodiments, the polyol can be 10-25%, and more specifically, it can be 5-10%, 10-20%, 20-30%, or 30-40%.

[0040] 3) The catalyst is selected from one or a mixture of two or more of the following: dibutyltin dilaurate, cobalt naphthenate, cobalt octate, potassium oleate, butyl titanate, triethylamine, and stannous octate. The catalyst dosage is the catalytic amount; the catalyst content, by weight percentage, is 0.01–1%, preferably 0.01–0.06% of the binder raw materials. More specifically, it can be 0.01–0.03%, 0.03–0.05%, 0.05–0.1%, 0.1–0.5%, or 0.5–1%.

[0041] 4) Tackifier, the tackifier suitable for the binder formulation of this application is selected from one or a mixture of two or more of C5 petroleum resin, C9 petroleum resin, C5 / C9 copolymer petroleum resin, dicyclopentadiene petroleum resin (DCPD), coumarone-indene resin, styrene resin, terpene resin, marinic rosin resin, and polymerized rosin; preferably selected from at least one of C5 petroleum resin, C9 petroleum resin, C5 / C9 copolymer petroleum resin, terpene resin, styrene resin, marinic rosin resin, and polymerized rosin.

[0042] In some specific embodiments, the binder comprises 1-30% by weight of tackifier. In some specific embodiments, the tackifier may be 5-20%, and more specifically, it may be 1-5%, 5-10%, 10-15%, or 15-20%.

[0043] 5) Anhydride, the anhydride used in the binder formulation of this application is selected from one or a mixture of two or more of succinic anhydride, maleic anhydride, fumaric anhydride, methyl fumaric acid, methyl maleic acid, maleic anhydride, chlorinated maleic acid, trimellitic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, and dodecenylsuccinic anhydride. Preferably, it is selected from at least one of trimellitic anhydride, maleic anhydride, succinic anhydride, or maleic anhydride.

[0044] In some specific embodiments, the raw materials of the binder, by weight percentage, contain 1-20% acid anhydride. In some specific embodiments, the acid anhydride can be 1-15%, and more specifically, it can be 1-5%, 5-10%, 10-15%, or 15-20%.

[0045] 6) The alkaline neutralizing agent is selected from at least one of the following: triethylamine, tripropylamine, dimethylethylamine, diethanolamine, triethanolamine and dimethylethanolamine, sodium hydroxide aqueous solution, potassium hydroxide aqueous solution, calcium hydroxide aqueous solution, lithium hydroxide aqueous solution, sodium carbonate aqueous solution, potassium carbonate aqueous solution, sodium bicarbonate aqueous solution, sodium sulfide aqueous solution, and ammonia water.

[0046] In some specific embodiments, the binder contains, by weight percentage, an alkaline neutralizing agent of 1-15%. In some specific embodiments, the acid anhydride can be 5-15%, more specifically 1-5%, 5-10%, or 10-15%.

[0047] 7) The raw materials of the binder, by weight percentage, contain 1-15% water. In some specific embodiments, the water content can be 5-15%, and more specifically, it can be 1-5%, 5-10%, or 10-15%.

[0048] A second aspect of this invention provides a method for preparing a water-based alkyd resin binder for engraving gravure inks, comprising the following steps:

[0049] 1) The vegetable oil fatty acids, polyacids, polyols and catalyst are reacted in the first reaction according to the formula;

[0050] The mixing ratio is the same as the formulation ratio of the water-based alkyd resin binder for the above-mentioned engraving gravure ink. The first reaction is carried out under inert gas protection, typically nitrogen. The reaction temperature for the first reaction is 200–240℃, with options including 200–210℃, 210–220℃, 220–230℃, or 230–240℃; the reaction time is 1–5 hours, with options including 1–2 hours, 2–3 hours, 3–4 hours, or 4–5 hours. The reaction is terminated when the acid value detected by sampling is less than 10 mg KOH / g, at which point the next step can proceed.

[0051] After the first reaction in step 1), perform the first cooling, and then proceed as follows, step 2). The first cooling reaches a temperature of 150-200℃, which can be 150-160℃, 160-170℃, 170-180℃, 180-190℃, or 190-200℃.

[0052] 2) Add the thickener and acid anhydride for a second reaction. The reaction temperature for the second reaction in step 2) is 150–200℃, but can be 150–160℃, 160–170℃, 170–180℃, 180–190℃, or 190–200℃. The reaction time is 1–3 hours, but can be 1–2 hours or 2–3 hours. The reaction is terminated when the acid value measured by the sample reaches 60–80 mg KOH / g, at which point the next step can be performed.

[0053] After the second reaction in step 2), a second cooling process is performed, followed by step 3). The second cooling process reaches a temperature of 60–100°C, which can be selected as 60–70°C, 70–80°C, 80–90°C, or 90–100°C.

[0054] 3) Finally, add an alkaline neutralizer and water for a third reaction to obtain the water-based alkyd resin binder for engraving gravure ink. The reaction temperature for the third reaction is 60–100℃, with options including 60–70℃, 70–80℃, 80–90℃, or 90–100℃. The reaction time is 1–2 hours, with options including 1–1.5 hours or 1.5–2 hours.

[0055] A third aspect of the present invention provides an engraving gravure ink, comprising an aqueous alkyd resin binder for the engraving gravure ink as described above.

[0056] The beneficial effects of the present invention are further illustrated below with reference to the embodiments. Unless otherwise specified, the reagents, materials, and instruments used in the following embodiments are commercially available. The reagents or materials used in the embodiments and comparative examples are the same unless otherwise specified.

[0057] Ricinoleic acid: CAS NO.141-22-0; Triterpenoid anhydride: CAS NO.552-30-7; Dibutyltin dilaurate: CAS NO.77-58-7; Soybean oil acid: CAS NO.68308-53-2; Coconut oil fatty acids: CAS NO.61788-47-4; Stannous octoate: CAS NO.301-10-0; Terpene resin: CAS NO.9003-74-1; Linoleic acid: CAS NO.60-33-3; Castor oil fatty acids: CAS NO.61789-44-4; Polymerized rosin: CAS NO.65997-05-9. Phenolic resin uses brand V338 or 97-3# from Suzhou Zilong Anti-counterfeiting Technology Co., Ltd.

[0058] Example 1

[0059] The formulation of waterborne alkyd resin binder is shown in Table 1:

[0060] Table 1

[0061]

[0062]

[0063] Preparation method: Vegetable oil fatty acids, polyacids, polyols, and catalysts are reacted at 210°C for 3.5 hours under nitrogen protection. The temperature is then lowered to 175°C, and a thickener and acid anhydride are added. The reaction is continued for 2 hours. Finally, the temperature is lowered to 65°C, and an alkaline neutralizer and water are added. The reaction is continued for 1 hour to obtain a water-based alkyd resin binder for engraving gravure ink.

[0064] The prepared waterborne alkyd resin binder has a viscosity of 9.2 Pa·s (at 25°C, measured using a HAAKE RV1 rheometer with a 1-degree cone plate and a shear rate of 300 s⁻¹). -1 The resin binder has an acid value of 3 mg KOH / g, an initial viscosity of 105, and a maximum viscosity of 863 (40℃, IGT TACK 450 viscometer). It is solvent-free.

[0065] Example 2

[0066] The formulation of waterborne alkyd resin binder is shown in Table 2:

[0067] Table 2

[0068]

[0069]

[0070] Preparation method: Vegetable oil fatty acids, polyacids, polyols, and catalysts are reacted at 220°C for 3 hours under nitrogen protection. The temperature is then lowered to 165°C, and a thickener and acid anhydride are added. The reaction is continued for 2.5 hours. Finally, the temperature is lowered to 75°C, and an alkaline neutralizer and water are added. The reaction is continued for 1.5 hours to obtain a water-based alkyd resin binder for engraving gravure ink.

[0071] The prepared waterborne alkyd resin binder had a viscosity of 10.8 Pa·s (at 25°C, measured using a HAAKE RV1 rheometer with a 1-degree cone plate and a shear rate of 300 s⁻¹). -1 The resin binder has an acid value of 5 mg KOH / g, an initial viscosity of 122, and a maximum viscosity of 886 (40℃, IGT TACK 450 viscometer). It is solvent-free.

[0072] Example 3

[0073] The formulation of water-based alkyd resin binder is shown in Table 3:

[0074] Table 3

[0075]

[0076] Preparation method: Vegetable oil fatty acids, polyacids, polyols, and catalysts are reacted at 230°C for 3 hours under nitrogen protection. The temperature is then lowered to 160°C, and a thickener and acid anhydride are added. The reaction is continued for 2.5 hours. Finally, the temperature is lowered to 75°C, and an alkaline neutralizer and water are added. The reaction is continued for 1.5 hours to obtain a water-based alkyd resin binder for engraving and gravure printing ink.

[0077] The prepared waterborne alkyd resin binder has a viscosity of 12.5 Pa·s (at 25°C, measured using a HAAKE RV1 rheometer with a 1-degree cone plate and a shear rate of 300 s⁻¹). -1 The resin binder has an acid value of 4 mg KOH / g, an initial viscosity of 137, and a maximum viscosity of 969 (40℃, IGT TACK 450 viscometer). It is solvent-free.

[0078] Example 4

[0079] The aqueous alkyd resin prepared in Example 2 was applied to ink. The ink formulation is shown in Table 4.

[0080] Table 4

[0081]

[0082] The prepared engraving gravure ink has a viscosity of 13 Pa·s (40℃, HAAKE RV1 rheometer, 1 degree cone plate, shear rate of 300 s⁻¹). -1The ink has a fineness of 15 microns, an initial viscosity of 188, and a maximum viscosity of 392 (40℃, IGT TACK 450 viscosity tester). The solvent content of the ink is approximately 8%. It is suitable for low-concentration wiping solutions with a NaOH content of 0-1% and a Taikoo oil content of 0-0.2%. Pure water can also be used for wiping.

[0083] Comparative Example 1

[0084] The standard alkyd resin formulations are shown in Table 5:

[0085] Table 5

[0086]

[0087] Preparation method: Vegetable oil fatty acids, polyacids, polyols, and catalysts are reacted at 220°C for 3 hours under nitrogen protection, then cooled to 170°C and acid anhydrides are added, and the reaction is carried out for 2 hours to prepare a water-based alkyd resin binder for engraving and gravure printing ink.

[0088] The conventional alkyd resin binder has a viscosity of 5.1 Pa·s (at 25°C, measured using a HAAKE RV1 rheometer with a 1-degree cone plate and a shear rate of 300 s⁻¹). -1 The resin binder has an acid value of 42 mg KOH / g, an initial viscosity of 70, and a maximum viscosity of 576 (40℃, IGT TACK 450 viscometer). The solvent content is approximately 19%.

[0089] Comparative Example 2

[0090] The ink formulation made using conventional alkyd resin in Comparative Example 1 is shown in Table 6:

[0091] Table 6

[0092]

[0093]

[0094] The engraving gravure ink prepared from conventional alkyd resin has a viscosity of 12.3 Pa·s (40℃, HAAKE RV1 rheometer, 1 degree cone plate, shear rate of 300 s⁻¹). -1 The ink has a fineness of 15 microns, an initial viscosity of 150, and a maximum viscosity of 306 (40℃, IGT TACK450 viscometer). The solvent content is approximately 18%. Suitable ink concentrations for wiping are: NaOH content 0.8-2%, and Taikoo oil content 0.4-1%.

[0095] The engraving gravure ink prepared using water-based alkyd resin has a higher viscosity than that prepared using conventional alkyd resin, resulting in better transfer performance. It also has a low solvent content, requiring less NaOH and tungsten oil in the wiping solution, and can be wiped with pure water, making it highly environmentally friendly.

[0096] In summary, the water-based alkyd resin binder of the present invention does not contain organic solvents, and the organic solvent content of the engraving gravure ink prepared using it can be reduced by more than 30%. During the ink printing process, the ink has high viscosity and good transfer properties. Alkaline substances and surfactants can be eliminated in the wiping solution, and water can be used directly for wiping, which greatly reduces the difficulty and cost of post-treatment of waste liquid.

[0097] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the method of the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A water-based alkyd resin binder for engraving gravure ink, characterized in that, The raw materials of the binder, by weight percentage, include the following components: Vegetable oils contain 5-40% fatty acids; Polybasic acids 5-40%; Polyols 5-40%; Catalyst 0.01~1%; Tackifier 1~30%; Acid anhydride 1~20%; Alkaline neutralizer 1~15%; Water 1~15%; The tackifier is selected from at least one of C5 petroleum resin, C9 petroleum resin, C5 / C9 copolymer petroleum resin, dicyclopentadiene petroleum resin, coumarone-indene resin, styrene resin, terpene resin, marinic acid rosin resin, and polymeric rosin. The polyacid is selected from at least one of isophthalic acid, phthalic anhydride, tetrahydrophthalic anhydride, maleic anhydride, fumaric acid, maleic acid chloride, malonic acid, succinic acid, azelaic acid, and undecanoic acid; The polyol is selected from at least one of polyethylene glycol, glycerol, trimethylolpropane, bis-trimethylolpropane, trimethylolethane, 1,2,6-hexanetriol, pentaerythritol, dipentaerythritol, xylitol, sorbitol, mannitol, sucritol, polyether polyol, and polyester polyol. The preparation method of water-based alkyd resin binder for engraving gravure ink includes the following steps: 1) The vegetable oil fatty acids, polyacids, polyols and catalyst are reacted in the first reaction according to the formula; 2) Add thickener and acid anhydride for a second reaction; 3) Finally, add an alkaline neutralizer and water for a third reaction to obtain water-based alkyd resin binder for engraving gravure ink.

2. The waterborne alkyd resin binder as described in claim 1, characterized in that, The raw materials of the binder, by weight percentage, include the following components: Vegetable oils contain 10-35% fatty acids; Polybasic acids 10-25%; Polyols 10-25%; Catalyst 0.01~0.06%; Tackifier 5~20%; Acid anhydride 1~15%; Alkaline neutralizer 5-15%; Water content: 5-15%.

3. The waterborne alkyd resin binder as described in claim 1 or 2, characterized in that, The fatty acids in the vegetable oil are selected from at least one of tung oil acid, linolenic acid, linoleic acid, lauric acid, palmitic acid, arachidic acid, myristic acid, ricinoleic acid, dehydrated ricinoleic acid, tall oil fatty acids, coconut oil fatty acids, conjugated sunflower oil acid, and soybean oil acid.

4. The waterborne alkyd resin binder as described in claim 1, characterized in that, The polyacid comprises at least two polyacids; and / or, the polyol comprises at least two polyols.

5. The waterborne alkyd resin binder as described in claim 1, characterized in that, The functionality of the polyether polyol is ≥2; and / or, the functionality of the polyester polyol is ≥2.

6. The waterborne alkyd resin binder as described in claim 1 or 2, characterized in that, It also includes at least one of the following technical features: a1. The catalyst is selected from at least one of dibutyltin dilaurate, cobalt naphthenate, cobalt octanoate, potassium oleate, butyl titanate, triethylamine, and stannous octanoate; a2, wherein the acid anhydride is selected from at least one of succinic anhydride, maleic anhydride, trans-butenediic anhydride, methyl-trans-butenediic acid, methyl-maleic acid, maleic anhydride, chlorinated maleic acid, trimellitic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, and dodecenylsuccinic anhydride. a3. The alkaline neutralizing agent is selected from at least one of triethylamine, tripropylamine, dimethylethylamine, diethanolamine, triethanolamine and dimethylethanolamine, sodium hydroxide aqueous solution, potassium hydroxide aqueous solution, calcium hydroxide aqueous solution, lithium hydroxide aqueous solution, sodium carbonate aqueous solution, potassium carbonate aqueous solution, sodium bicarbonate aqueous solution, sodium sulfide aqueous solution, and ammonia water.

7. The water-based alkyd resin binder for engraving gravure ink as described in claim 1, characterized in that, It includes at least one of the following technical features: B1, The first reaction in step 1) is carried out under the protection of an inert gas; B2. The reaction temperature of the first reaction in step 1) is 200-240℃, and the reaction time is 1-5h. B3. After the first reaction in step 1), perform the first cooling, and then proceed to step 2); the first cooling reaches a temperature of 150-200℃; B4. The reaction temperature for the second reaction in step 2) is 150–200℃, and the reaction time is 1–3 hours. B5. After the second reaction in step 2), perform a second cooling, and then proceed to step 3); the second cooling reaches a temperature of 60-100℃; B6. The reaction temperature of the third reaction in step 3) is 60-100℃, and the reaction time is 1-2h.

8. An engraving gravure ink, comprising the water-based alkyd resin binder for engraving gravure ink as described in any one of claims 1-6.

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