CN107201077B - Preparation method of improved offset printing ink - Google Patents

Preparation method of improved offset printing ink Download PDF

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Publication number
CN107201077B
CN107201077B CN201710603342.6A CN201710603342A CN107201077B CN 107201077 B CN107201077 B CN 107201077B CN 201710603342 A CN201710603342 A CN 201710603342A CN 107201077 B CN107201077 B CN 107201077B
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resin
printing ink
catalyst
offset printing
mixing
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Expired - Fee Related
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CN201710603342.6A
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CN107201077A (en
Inventor
唐雪平
杜欣
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Recus Haikou Technology Promotion Service Partnership LP
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Chang Fengtong
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3203—Polyhydroxy compounds
    • C08G18/3206—Polyhydroxy compounds aliphatic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4072—Mixtures of compounds of group C08G18/63 with other macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/63—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers
    • C08G18/632—Block or graft polymers obtained by polymerising compounds having carbon-to-carbon double bonds on to polymers onto polyethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
    • C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
    • C08G18/6677—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203 having at least three hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/42—Block-or graft-polymers containing polysiloxane sequences
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/06—Printing inks based on fatty oils

Abstract

The invention discloses a preparation method of improved offset printing ink, which comprises the steps of firstly utilizing polyester or polyether dihydric alcohol to react with polymer polyalcohol, micromolecular dihydric alcohol or diamine to obtain alcohol ester type polyurethane resin solution with relatively stable property, then utilizing epoxy resin and organic silicon to prepare heat-resistant resin, and finally mixing the polyurethane resin solution with the heat-resistant resin and then mixing with pigment, drier, anti-emulsifier and antioxidant to obtain the improved offset printing ink. The method disclosed by the invention has the advantages that the polyurethane synthesis efficiency is high, the environment is protected, and the method is used for preparing the offset printing ink by mixing the polyurethane with the heat-resistant resin and the acid-resistant pigment, so that the printing ink is not more environment-friendly, and meanwhile, the acid resistance and the heat resistance of the printing ink are obviously enhanced.

Description

Preparation method of improved offset printing ink
Technical Field
The invention relates to the technical field of fine chemicals, in particular to a preparation method of improved offset printing ink.
Background
With the rapid development of modern printing industry, the quality requirement on printed matters is continuously improved, and the quality requirement on ink is also improved. The key of the ink renewal is to further improve the performance of the resin. At present, resin for offset lithographic printing ink mainly comprises rosin modified phenolic resin. In recent years, according to the new target and requirement of offset printing ink development, further innovative development and improvement on production formula and process are required to obtain resin products with various specifications, and meet the development requirement of novel high-speed, high-precision and environmentally-friendly printing technology.
The acrylic resin is a copolymer, and the ink resin with excellent comprehensive performance and strong controllability can be obtained by selecting proper monomers, so that the requirements of the current printing industry on the ink can be better met. The alcohol-soluble ink uses ethanol as a solvent, so that the alcohol-soluble ink is good in environmental protection, the wettability of the ethanol and the surface of plastic is good, and the volatility of the ethanol is better than that of water. In addition, the alcohol-soluble ink printing process is similar to benzene-soluble ink and can be used on any existing equipment, so that the alcohol-soluble ink is a product which is most suitable for replacing the benzene-soluble ink to enter industrial production, has good service performance and environmental protection performance, and is widely concerned.
In patent CN 104031467a, "a preparation method of an environment-friendly solvent type polyurethane ink", maleic anhydride, oxalic acid, methyl ethylene propylene glycol, diisocyanate, etc. are used to synthesize polyurethane resin, and the polyurethane resin is applied to a formula of the ink to obtain the environment-friendly type polyurethane ink. In patent CN 106280693A, polyurethane emulsion is prepared by short-chain polyol ester, and then the emulsion is put in the formula of the ink to obtain the environment-friendly polyurethane ink, and the method and the bone penetrating polyurethane are simpler. However, although polyurethane resins are highly viscous and environmentally friendly, they are less heat-resistant and are likely to fall off after offset printing, and therefore, it is of great importance to develop a heat-resistant polyurethane ink.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for preparing an improved offset ink, which comprises the following steps:
(1) vacuum degassing polyester or polyether glycol, adding polymer polyol and diisocyanate, heating to 70-90 ℃, adding a catalyst, carrying out prepolymerization reaction for 2-4 hours, cooling to room temperature, diluting with a solvent, dropwise adding a small-molecular glycol or diamine solution, carrying out chain extension reaction for 1-2 hours, properly adding 5-8% of a cross-linking agent at the end of chain extension, continuously reacting for 0.5-1 hour, and dissolving with an alcohol ester mixed solvent to obtain an alcohol ester type polyurethane resin solution with relatively stable properties;
(2) weighing a certain amount of epoxy resin E20 and cellulose acetate, mixing, dissolving the epoxy resin in a solvent, heating, adding a catalyst and an organic silicon intermediate, then removing water generated by a condensation reaction under reduced pressure, carrying out a crosslinking reaction for 4-6h after the temperature is constant at 40-60 ℃, filtering, washing the obtained resin with ethanol, and drying to obtain epoxy modified organic silicon resin;
(3) mixing the alcohol ester type polyurethane resin solution and the epoxy modified organic silicon resin according to a certain proportion, heating to 50-80 ℃, uniformly stirring, adding a gelling agent, heating to 150-180 ℃, preserving heat for 30 min, adding mineral oil, and uniformly mixing to obtain a bonding material;
(4) uniformly mixing the prepared binder with acid-resistant tempering pigment, drier, antioxidant and anti-emulsifier, placing the mixture on a three-roller machine, rolling the mixture for 2 to 3 times under the pressure of 10 to 20MPa and the temperature of 30 to 50 ℃, reducing the pressure of the three-roller machine to 3 to 6MPa, and adjusting the viscosity of the mixture to a set range by using mineral oil to obtain the improved offset printing ink.
Preferably, the polyester or polyether diol in step (1) is one of polytetrahydrofuran ether (PTMG), Polycarbonate (PCD), polypropylene oxide (PPG), polyester 775 and lightly branched polyester 670BA polymer polyol; the addition amount of the polymer polyol and the diisocyanate is 1: 0.5-1.5; the catalyst is one of stannous octoate and dibutyltin dilaurate; the addition amount of the catalyst is 1-2%.
Preferably, the solvent in the step (1) is one of ethyl acetate, petroleum ether and acetone; the micromolecular dihydric alcohol or diamine is one of 1, 4-Butanediol (BDO), 1, 4-Cyclohexanedimethanol (CHDM), neopentyl glycol (NPG), isophorone diamine (IPDA) and Ethylenediamine (EDA); the addition amount of the micromolecular dihydric alcohol or the diamine is 5-10%.
Preferably, the crosslinking agent in step (1) is Trimethylolpropane (TMP).
Preferably, the mass ratio of the epoxy resin E20 to the cellulose acetate in the step (2) is 1: 1-2; the solvent is one of petroleum ether and ethyl acetate; the organosilicon intermediate is Z-6018, and the addition amount is 15-35%; the catalyst is one of isooctanoic acid and n-octanoic acid; the addition amount of the catalyst is 1.5-3%.
Preferably, the adding amount of the alcohol ester type polyurethane resin and the epoxy modified organic silicon resin in the step (3) is 1: 0.8-1.2; the gel is diethyl aluminum acetate diisopropyl ester or dialkyl aluminum chelate of XP148, and the addition amount of the gel is 0.2-1.0%.
Preferably, the acid-resistant toughened pigment in the step (4) consists of low-melting-point glass powder and high-temperature ceramic melanin; the anti-emulsifier is methyl silicone oil or wax powder; the drier is a mixture of manganese isooctanoate and cobalt isooctanoate; the antioxidant is one of tea polyphenol, citric acid, butyl hydroxy anisol and dibutyl hydroxy toluene; the viscosity of the ink is 11-13 Pa.s.
Compared with the traditional offset printing ink preparation method, the preparation method of the improved offset printing ink adopts the polyester or polyether diol and diisocyanate and other compounds to synthesize the environment-friendly alcohol ester type polyurethane ink, so that the environment friendliness of the ink is enhanced; the epoxy resin and the organic silicon are used for forming the mixed resin, so that the heat resistance of the resin is improved, and the internal heat property of the ink is improved; in addition, a drier is added in the process of preparing the ink, so that the ink can be quickly dried in offset printing, and the printing efficiency is improved.
Detailed Description
The present invention will be further described with reference to specific examples, which will help those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention.
Example 1
Adding 1:1 polymer polyol and diisocyanate after removing polytetrahydrofuran ether in vacuum, heating to 80 ℃, adding 1% stannous octoate, carrying out prepolymerization reaction for 2 hours, cooling to room temperature, diluting with ethyl acetate, dropwise adding 8% 1, 4-butanediol, carrying out chain extension reaction for 1.5 hours, adding 5% trimethylolpropane, continuing to react for 0.1 hour, and dissolving with an alcohol ester mixed solvent to obtain an alcohol ester type polyurethane resin solution with relatively stable property; weighing 1:1 epoxy resin E20 and cellulose acetate, mixing, adding ethyl acetate, heating for dissolving, adding 2% of n-octanoic acid and 20% of Z-6018, removing water generated by condensation reaction under reduced pressure, carrying out crosslinking reaction for 4 hours at a constant temperature of 60 ℃, filtering, washing the obtained resin with ethanol, and drying to obtain epoxy modified organic silicon resin; mixing an alcohol ester type polyurethane resin solution and an epoxy modified organic silicon resin according to a mass ratio of 1:1, heating to 80 ℃, uniformly stirring, adding 0.5% ethyl aluminum acetate diisopropyl ester, heating to 170 ℃, keeping the temperature for 30 min, adding mineral oil, and uniformly mixing to obtain a bonding material; the prepared binder is uniformly mixed with 5% of low-melting-point glass powder, high-temperature ceramic melanin, 1% of a mixture of manganese isooctoate and cobalt isooctanoate, 2% of tea polyphenol and 2% of methyl silicon, the mixture is placed on a three-roll mill and rolled for 3 times at the pressure of 15MPa and the temperature of 45 ℃, then the pressure of the three-roll mill is reduced to 4MPa, and the viscosity is adjusted to be in the range of 11.5-12.5Pa.s by using mineral oil, so that the improved offset printing ink is obtained.
Example 2
Removing polypropylene oxide in vacuum, adding polymer polyol and diisocyanate in a ratio of 1:1, heating to 85 ℃, adding the mixture into 1.5% dibutyltin dilaurate, carrying out prepolymerization reaction for 1.5 hours, cooling to room temperature, diluting with petroleum ether, dropwise adding 9% 1, 4-cyclohexanedimethanol for chain extension reaction for 1.5 hours, adding 5% trimethylolpropane, continuing to react for 0.1 hour, and dissolving with an alcohol ester mixed solvent to obtain an alcohol ester type polyurethane resin solution with relatively stable property; weighing 1:1 epoxy resin E20 and cellulose acetate, mixing, adding petroleum ether, heating for dissolving, adding 2% of isooctanoic acid and 20% of Z-6018, decompressing, removing water generated by condensation reaction, carrying out crosslinking reaction at 60 ℃ for 4 hours after constant temperature, filtering, washing the obtained resin with ethanol, and drying to obtain epoxy modified organic silicon resin, mixing an alcohol ester type polyurethane resin solution and the epoxy modified organic silicon resin according to the mass ratio of 1:1.2, heating to 85 ℃, uniformly stirring, adding 0.5% of XP148 dialkyl aluminum chelate, heating to 160 ℃, keeping the temperature for 25 min, and then adding mineral oil for uniformly mixing to obtain a bonding material; the prepared binder is uniformly mixed with 5% of low-melting-point glass powder, high-temperature ceramic melanin, 1.2% of a mixture of manganese isooctoate and cobalt isooctanoate, 2% of citric acid and 2% of methyl silicon, the mixture is placed on a three-roll mill, the mixture is rolled for 3 times under the pressure of 15MPa and the temperature of 45 ℃, then the pressure of the three-roll mill is reduced to 4MPa, and the viscosity is adjusted to be in the range of 11.5-12.5Pa.s by using mineral oil, so that the improved offset printing ink is obtained.
It is obvious to those skilled in the art that the present invention is not limited to the above embodiments, and it is within the scope of the present invention to adopt various insubstantial modifications of the method concept and technical scheme of the present invention, or to directly apply the concept and technical scheme of the present invention to other occasions without modification.

Claims (5)

1. A method for preparing improved offset printing ink is characterized by comprising the following steps:
(1) adding polymer polyol and diisocyanate into polyester after vacuum degassing, heating to 70-90 ℃, adding a catalyst, carrying out prepolymerization reaction for 2-4 hours, cooling to room temperature, diluting with a solvent, dropwise adding a small-molecule diol or diamine solution to carry out chain extension reaction for 1-2 hours, adding 5-8% of a cross-linking agent at the end of chain extension, continuously reacting for 0.5-1 hour, and dissolving with an alcohol ester mixed solvent to obtain an alcohol ester type polyurethane resin solution;
(2) weighing a certain amount of epoxy resin E20 and cellulose acetate, mixing, dissolving the epoxy resin in a solvent, heating, adding a catalyst and an organic silicon intermediate, then removing water generated by a condensation reaction under reduced pressure, carrying out a crosslinking reaction for 4-6h after the temperature is constant at 40-60 ℃, filtering, washing the obtained resin with ethanol, and drying to obtain epoxy modified organic silicon resin; the mass ratio of the epoxy resin E20 to the cellulose acetate is 1: 1-2; the solvent is one of petroleum ether and ethyl acetate; the organosilicon intermediate is Z-6018, and the addition amount is 15-35%; the catalyst is one of isooctanoic acid and n-octanoic acid; the adding amount of the catalyst is 1.5-3%;
(3) mixing the alcohol ester type polyurethane resin solution and the epoxy modified organic silicon resin according to a certain proportion, heating to 50-80 ℃, uniformly stirring, adding a gelling agent, heating to 150-180 ℃, preserving heat for 30 min, adding mineral oil, and uniformly mixing to obtain a bonding material;
(4) uniformly mixing the prepared binder with acid-resistant tempering pigment, drier, antioxidant and anti-emulsifier, placing the mixture on a three-roll machine, rolling the mixture for 2 to 3 times under the pressure of 10 to 20MPa and the temperature of 30 to 50 ℃, reducing the pressure of the three-roll machine to 3 to 6MPa, and adjusting the viscosity of the mixture to a set range by using mineral oil to obtain the improved offset printing ink; the acid-resistant toughened pigment consists of low-melting-point glass powder and high-temperature ceramic melanin; the anti-emulsifier is methyl silicone oil or wax powder; the drier is a mixture of manganese isooctanoate and cobalt isooctanoate; the antioxidant is one of tea polyphenol, citric acid, butyl hydroxy anisol and dibutyl hydroxy toluene.
2. The method of claim 1 wherein said polyester of step (1) is one of polycarbonate, polyester 775; the catalyst is one of stannous octoate and dibutyltin dilaurate; the addition amount of the catalyst is 1-2%.
3. The method of claim 1, wherein the solvent in step (1) is one of ethyl acetate, petroleum ether, and acetone; the micromolecular dihydric alcohol or diamine is one of 1, 4-butanediol, 1, 4-cyclohexanedimethanol, neopentyl glycol, isophorone diamine and ethylenediamine; the addition amount of the micromolecular dihydric alcohol or the diamine is 5-10%.
4. The method of claim 1, wherein said cross-linking agent in step (1) is trimethylolpropane.
5. The method of claim 1, wherein the alcohol ester type urethane resin and the epoxy modified silicone resin are added in an amount of 1: 0.8-1.2; the gel is dialkyl aluminum chelate of XP148, and the addition amount of the gel is 0.2-1.0%.
CN201710603342.6A 2017-07-22 2017-07-22 Preparation method of improved offset printing ink Expired - Fee Related CN107201077B (en)

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