CN112094533A - Slow-drying-treated flexo-printing environment-friendly tipping paper water-based ink and preparation method thereof - Google Patents
Slow-drying-treated flexo-printing environment-friendly tipping paper water-based ink and preparation method thereof Download PDFInfo
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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
- C09D11/106—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09D11/107—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds from unsaturated acids or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/04—Anhydrides, e.g. cyclic anhydrides
- C08F222/06—Maleic anhydride
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- 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
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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
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
- C09D11/033—Printing inks characterised by features other than the chemical nature of the binder characterised by the solvent
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Abstract
The invention provides a flexo printing environment-friendly tipping paper water-based ink subjected to slow drying treatment and a preparation method thereof, wherein the flexo printing environment-friendly tipping paper water-based ink comprises the following components in percentage by weight: 11% -20% of acrylic resin; the dilution resin is 18% -37%; 10% -22% of pigment; 1% -2.5% of slow-drying agent; 0.3% -0.8% of wetting agent; 0.6% -1.0% of a leveling agent; 0.01% -0.1% of defoaming agent; 0.1% -0.5% of pH regulator; the balance of water; the slow drying agent is a copolymer of maleic anhydride-acrylic acid-butyl acrylate. The flexographic printing environment-friendly tipping paper water-based ink subjected to slow drying treatment can be suitable for the flexographic printing production of tipping paper, and the slow drying agent is added into an ink system, so that the phenomenon that a printing plate is dried can be effectively avoided; in addition, the water-based ink disclosed by the invention uses pure water as a solvent, does not contain a volatile organic solvent, and has the total content of VOCs (volatile organic compounds) of less than 5% and better quality.
Description
Technical Field
The invention relates to the technical field of flexo printing water-based ink, in particular to a flexo printing environment-friendly tipping paper water-based ink subjected to slow drying treatment and a preparation method thereof.
Background
At present, the traditional tipping paper printing mode is solvent-based ink gravure printing, so that hidden dangers in the aspect of health and safety indexes exist, and volatile organic solvents (namely VOCs) such as ethanol, ethyl acetate, n-propyl acetate and the like are inevitably discharged into the atmosphere in the production process. In order to further improve the safety performance of the cigarette tipping paper and reduce the emission of VOCs in the production process, a safer and more environment-friendly production mode needs to be searched.
The water-based ink is prepared by compounding and grinding water-soluble resin, organic pigment, food-grade binder and the like. The printing ink has the advantages that the solvent used in the printing ink is not an organic solvent but water, and the printing ink does not contain volatile organic solvents, so that the emission of VOC (volatile organic compounds) is greatly reduced, thereby lightening the atmospheric pollution, improving the environment of printing operators and being beneficial to the health of workers. Meanwhile, the method can completely eliminate harmful substances in the solvent type ink, eliminate the harm to human bodies caused by the pollution of packaged commodities and improve the overall environmental quality. In addition, it can not only reduce the residual toxicity on the surface of the printed matter, making the cleaning of the printing equipment convenient, but also reduce the fire hazard and hidden trouble caused by static electricity and flammable solvents, so the water-based ink is called as a novel "green" printing material.
The latest published HJ317-2018 environmental label product technical requirement gravure ink and flexo ink of the department of ecological environment definitely stipulates that the volatile organic compound is less than or equal to 5 percent, and the content of the volatile organic compound in the existing tipping paper water-based ink is more than 10-30 percent. Investigating the currently marketed flexographic aqueous inks, of which the total amount of VOCs does not exceed 5%, mainly for the printing of plastic films and cardboard, which are directly applied in the production of tipping paper printing, it was found that the inks dry and build up on the plate and anilox roller, and even cause the anilox roller to jam, the reason for this being analyzed, mainly because these inks dry too quickly and dry already on the plate when they have not been transferred to the tipping paper. Therefore, the commercial flexographic water-based ink with the VOCs content of less than 5% does not meet the printing production requirements of tipping paper, and the water-based ink suitable for the flexographic printing of the tipping paper needs to be newly developed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a slow-drying flexo environmentally-friendly tipping paper water-based ink and a preparation method thereof.
In order to solve the problems, the invention adopts the following technical scheme:
the flexo printing environment-friendly tipping paper water-based ink subjected to slow drying treatment comprises the following components in percentage by weight:
11% -20% of acrylic resin;
the dilution resin is 18% -37%;
10% -22% of pigment;
1-2.5% of slow-drying agent, wherein the slow-drying agent is a maleic anhydride-acrylic acid-butyl acrylate copolymerization compound;
0.3% -0.8% of wetting agent;
0.6% -1.0% of a leveling agent;
0.01% -0.1% of defoaming agent;
0.1% -0.5% of pH regulator;
the balance being water.
Preferably, the molecular weight of the slow drying agent is 3000-10000, and the slow drying agent is prepared by the following method:
adding an initiator into an aqueous solution containing maleic anhydride, acrylic acid, butyl acrylate and a chain transfer agent, and reacting for 2-3 hours at 80-90 ℃ to obtain a polymer solution;
and adding the polymer solution into acetone, separating out a precipitate, and drying to obtain the slow drying agent.
Preferably, the let-down resin is at least one of: styrene-acrylic resins, polyurethane resins.
Preferably, the wetting agent is digao TEGO550 or dow corning DC 67.
Preferably, the pH adjusting agent is ethanolamine.
Preferably, the pigments are titanium dioxide and kaolin.
Preferably, the pigments are iron oxide yellow and kaolin.
Preferably, the pigments are iron oxide red and kaolin.
Preferably, the pigment is a vegetable carbon black and c.i. pigment black 7.
The invention also provides a preparation method of the flexo printing environment-friendly tipping paper water-based ink subjected to slow drying treatment, which comprises the following steps:
adding acrylic resin and pigment into water, and uniformly stirring to obtain a first mixed solution;
grinding the first mixed solution into ink color paste;
adding a slow drying agent, a wetting agent, a flatting agent and a defoaming agent into the ink color paste, and uniformly stirring to obtain a second mixed solution; the slow drying agent is a copolymer of maleic anhydride-acrylic acid-butyl acrylate;
and adding a thinning resin and a pH regulator into the second mixed solution, uniformly stirring and filtering to obtain the water-based ink.
Compared with the prior art, the invention has the technical effects that:
the flexographic printing environment-friendly tipping paper water-based ink subjected to slow drying treatment can be suitable for flexographic printing production of tipping paper, and a maleic anhydride-acrylic acid-butyl acrylate copolymer is added into an ink system as a slow drying agent, so that the phenomenon that a printing plate is dried can be effectively avoided; meanwhile, the maleic anhydride-acrylic acid-butyl acrylate copolymer compound can improve the drying performance of the ink, the long molecular chain structure can be adsorbed on the surface of pigment particles, the dispersion stability of the pigment in the ink is enhanced by utilizing the steric hindrance effect, and no dispersant is required to be additionally added. In addition, the water-based ink disclosed by the invention uses pure water as a solvent, does not contain a volatile organic solvent, and has the total content of VOCs (volatile organic compounds) of less than 5% and better quality.
The preparation method of the slow-drying-treated flexo printing environment-friendly tipping paper water-based ink is simple and easy to operate and control.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a flexo printing environment-friendly tipping paper water-based ink subjected to slow drying treatment, which comprises the following components in percentage by weight: 11% -20% of acrylic resin; the dilution resin is 18% -37%; 10% -22% of pigment; 1% -2.5% of slow-drying agent; 0.3% -0.8% of wetting agent; 0.6% -1.0% of a leveling agent; 0.01% -0.1% of defoaming agent; 0.1% -0.5% of pH regulator; the balance being water. Wherein the slow drying agent is a copolymer of maleic anhydride-acrylic acid-butyl acrylate.
The fineness of the water-based ink of the flexo environment-friendly tipping paper subjected to slow drying treatment is less than or equal to 25 microns, the water-based ink can be suitable for flexo production of the tipping paper, and the copolymer of maleic anhydride, acrylic acid and butyl acrylate is added into an ink system as a slow drying agent, so that the phenomenon that a printing plate is dried can be effectively avoided. Because the maleic anhydride-acrylic acid-butyl acrylate copolymer contains much COO on the molecular structure-The hydrophilic group enhances the water retention capacity of the water-based ink, and further slows down the drying speed of the water-based ink. On the other hand, the long molecular chain structure of the maleic anhydride-acrylic acid-butyl acrylate copolymer is firmly adsorbed on the surface of pigment particles through covalent bonds or van der waals force, the dispersion stability of the pigment in the ink can be enhanced by utilizing the steric hindrance effect of the long molecular chain, and no additional dispersing agent is needed. In addition, the water-based ink disclosed by the invention uses pure water as a solvent, does not contain a volatile organic solvent, and has the total content of VOCs (volatile organic compounds) of less than 5% and better quality.
Preferably, the slow-drying agent can be prepared by the following method:
(1) adding an initiator into an aqueous solution containing maleic anhydride, acrylic acid, butyl acrylate and a chain transfer agent, and reacting for 2-3 hours at 80-90 ℃ to obtain a polymer solution; wherein the mole ratio of the maleic anhydride, the acrylic acid and the butyl acrylate is 2: 1: 0.25, using isopropanol as a chain transfer agent, wherein the dosage of the isopropanol is 15-20% of the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate. Ammonium persulfate is used as an initiator, and the dosage of the ammonium persulfate is 5-8% of the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate.
(2) And adding the polymer solution into acetone, separating out a precipitate, and drying to obtain the slow drying agent. The molecular weight of the prepared slow-drying agent is 3000-10000.
Preferably, the let-down resin is at least one of: styrene-acrylic resins, polyurethane resins. The styrene-acrylic resin has the advantages of strong adhesion, high transparency and glossiness, low cost and slow drying, and is more suitable for being used as water-based ink of a slow drying system.
Preferably, the wetting agent is digao TEGO550 or Dow Corning DC 67. The wetting agent can effectively reduce the surface tension of the water-based ink of the ink flexo environment-friendly tipping paper, so that the ink can be more easily wetted and spread on the tipping paper, and the ink has higher glossiness and wear resistance. The addition amount of the wetting agent is small, and the wetting agent plays a role in reducing the surface tension of the water-based ink, so that the leveling property of the ink can be improved, and the glossiness of a film layer can be improved; however, the addition amount of the wetting agent is too high, the wetting agent reaches the critical micelle concentration, the wetting and leveling effects of the ink are adversely affected, and the glossiness is reduced, and preferably, the content of the wetting agent is 0.4-0.6%.
The flatting agent is beneficial to air release and pigment dispersion, improves the wettability to paper and eliminates the change of surface tension; the surface tension of the dried ink strip reaches a uniform and lower level, the volatilization process of a solvent in the ink cannot be obviously changed, the optimal leveling property is achieved, the surface of an ink film is smooth, the frictional resistance is reduced, and the glossiness and the wear resistance of the ink can be effectively improved. When the addition amount of the flatting agent is less, the surface tension of the ink film can be homogenized as soon as possible, and a smooth and flat ink film is obtained; however, when the leveling agent is added in an excessive amount, the ink may generate a sagging phenomenon in the printing process, and the sagging phenomenon may leave a trace of ink flowing on a printed product or cause uneven thickness of an ink layer and poor leveling property. Preferably, the content of the leveling agent is 0.7-0.8%, and the leveling agent is an acrylate leveling agent.
Resin binders commonly used in aqueous inks are generally soluble in pure water and are relatively soluble in alkaline environments, and a pH adjuster is required to adjust the pH of the ink system. Preferably, the pH adjusting agent is ethanolamine. The pH value of the ink system is adjusted to 8.0-9.5, and at the moment, the ink has good fluidity, and the viscosity of the ink is maintained at a higher level, so that the ink is suitable for printing. Ethanolamine is used as a pH regulator, so that the obtained printing ink has no pungent smell, and the printed tipping paper sample has no peculiar smell, thereby meeting the requirements of the flexible printing environment-friendly tipping paper water-based printing ink. In addition, the ink system is alkalescent, and carboxylate ions in the molecular structure of the maleic anhydride-acrylic acid-butyl acrylate copolymer are favorably adsorbed on the surfaces of the pigment particles, so that the pigment particles are negatively charged, repulsive force exists among the pigment particles, and the dispersion stability of the pigment in the ink system is further improved.
When the pigments in the ink formulation are titanium dioxide and kaolin, an aqueous white ink is obtained.
When the pigments in the ink formulation are yellow iron oxide and kaolin, an aqueous yellow ink is obtained.
When the pigments in the ink formulation are red iron oxide and kaolin, an aqueous red ink is obtained.
When the pigments in the ink formulation are vegetable carbon black and c.i. pigment black 7, an aqueous black ink is obtained.
The embodiment of the invention also provides a preparation method of the flexo printing environment-friendly tipping paper water-based ink subjected to slow drying treatment, which comprises the following steps:
(1) adding acrylic resin and pigment into water, and uniformly stirring to obtain a first mixed solution;
(2) grinding the first mixed solution into ink color paste;
(3) adding a slow drying agent, a wetting agent, a flatting agent and a defoaming agent into the ink color paste, and uniformly stirring to obtain a second mixed solution; wherein the slow drying agent is a copolymer of maleic anhydride-acrylic acid-butyl acrylate;
(4) and adding the thinning resin and the pH regulator into the second mixed solution, uniformly stirring and filtering to obtain the water-based ink.
The following is a further description with reference to specific examples.
Example 1
The embodiment 1 of the invention provides a flexo printing environment-friendly tipping paper water-based white ink subjected to slow drying treatment and a preparation method thereof.
The slow-drying flexo printing environment-friendly tipping paper water-based white ink comprises the following components in percentage by weight: 11% of acrylic resin; 19% of styrene-acrylic resin; 15% of titanium dioxide; 5% of kaolin; 2.5 percent of slow drying agent; TEGO 5500.5% digao; 0.8 percent of leveling agent; 0.02% of defoaming agent; 0.2% of pH regulator; the balance being water.
The slow drying agent is prepared by the following method: in a 250mL four-necked flask, a solution was added in a molar ratio of 2: 1: 0.25 of the molar ratio of maleic anhydride, acrylic acid and butyl acrylate is 2: 1: 0.25, adding isopropanol accounting for 20 percent of the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate and 100mL of deionized water, heating the mixture in a water bath to 85 ℃, and dropwise adding ammonium persulfate solution under stirring, wherein the adding amount of the ammonium persulfate is 6 percent of the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate. Reacting at the constant temperature of 85 ℃ for 2h, cooling to room temperature, adding acetone into the reacted solution to precipitate a product, and drying the product to obtain the maleic anhydride-acrylic acid-butyl acrylate copolymer.
A preparation method of a slow-dry-processed flexo printing environment-friendly tipping paper water-based white ink comprises the following steps:
(1) adding the acrylic resin, the titanium dioxide and the kaolin into water according to the proportion, stirring for 30min in a high-speed impeller stirrer, and uniformly stirring to obtain a first mixed solution;
(2) grinding the first mixed solution in a grinder for 330min to obtain ink color paste;
(3) adding the slow drying agent, the digao TEGO550, the flatting agent and the defoaming agent in the ratio into the printing ink color paste, stirring for 30min, and uniformly stirring to obtain a second mixed solution;
(4) and adding the styrene-acrylic resin and the pH regulator in the ratio into the second mixed solution, uniformly stirring and filtering to obtain the water-based white ink.
Example 2
The embodiment 2 of the invention provides a flexo printing environment-friendly tipping paper aqueous yellow ink subjected to slow drying treatment and a preparation method thereof.
The slow-drying flexo printing environment-friendly tipping paper aqueous yellow ink comprises the following components in percentage by weight: 16% of acrylic resin; 37% of styrene-acrylic resin; 18% of iron oxide yellow; 3% of kaolin; 1.5% of slow-drying agent; TEGO 5500.6% digao; 0.9 percent of leveling agent; 0.1% of defoaming agent; 0.5 percent of pH regulator; the balance being water.
The slow drying agent is prepared by the following method: in a 250mL four-necked flask, a solution was added in a molar ratio of 2: 1: 0.25 of the molar ratio of maleic anhydride, acrylic acid and butyl acrylate is 2: 1: 0.25, adding 15 percent of isopropanol and 100mL of deionized water based on the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate, heating the mixture in a water bath to 80 ℃, and dropwise adding ammonium persulfate solution under stirring, wherein the adding amount of the ammonium persulfate is 7 percent of the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate. Reacting at the constant temperature of 80 ℃ for 2.5h, cooling to room temperature, adding acetone into the reacted solution to separate out a product, and drying the product to obtain the maleic anhydride-acrylic acid-butyl acrylate copolymer. A preparation method of a slow-dry-processed flexo printing environment-friendly tipping paper aqueous yellow ink comprises the following steps:
(1) adding the acrylic resin, the iron oxide yellow and the kaolin which are proportioned into water, stirring for 30min in a high-speed impeller stirrer, and uniformly stirring to obtain a first mixed solution;
(2) grinding the first mixed solution in a grinding machine for 350min to obtain ink color paste;
(3) adding the slow drying agent, the digao TEGO550, the flatting agent and the defoaming agent in the ratio into the printing ink color paste, stirring for 30min, and uniformly stirring to obtain a second mixed solution;
(4) and adding the styrene-acrylic resin and the pH regulator in the ratio into the second mixed solution, uniformly stirring and filtering to obtain the aqueous yellow ink.
Example 3
The embodiment 3 of the invention provides a flexo printing environment-friendly tipping paper water-based red ink subjected to slow drying treatment and a preparation method thereof.
The slow-drying flexo printing environment-friendly tipping paper water-based red ink comprises the following components in percentage by weight: 20% of acrylic resin; 37% of polyurethane resin; 8% of iron oxide red; 3% of kaolin; 1.0% of slow-drying agent; dao kangning DC 670.8%; 0.8 percent of leveling agent; 0.01 percent of defoaming agent; 0.4 percent of pH regulator; the balance being water.
The slow drying agent is prepared by the following method: in a 250mL four-necked flask, a solution was added in a molar ratio of 2: 1: 0.25 of the molar ratio of maleic anhydride, acrylic acid and butyl acrylate is 2: 1: 0.25, adding isopropanol accounting for 18 percent of the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate and 100mL of deionized water, heating the mixture in a water bath to 90 ℃, and dropwise adding ammonium persulfate solution under stirring, wherein the adding amount of the ammonium persulfate is 5 percent of the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate. Reacting at the constant temperature of 90 ℃ for 1.5h, cooling to room temperature, adding acetone into the reacted solution to separate out a product, and drying the product to obtain the maleic anhydride-acrylic acid-butyl acrylate copolymer. A preparation method of a slow-dry-processed flexo printing environment-friendly tipping paper water-based red ink comprises the following steps:
(1) adding the acrylic resin, the iron oxide red and the kaolin which are proportioned in the water, stirring for 30min in a high-speed impeller stirrer, and uniformly stirring to obtain a first mixed solution;
(2) grinding the first mixed solution in a grinding machine for 300min to obtain ink color paste;
(3) adding the slow drying agent, the Dow Corning DC67, the flatting agent and the defoaming agent into the printing ink color paste according to the above proportion, stirring for 30min, and uniformly stirring to obtain a second mixed solution;
(4) adding the polyurethane resin and the pH regulator in the proportion into the second mixed solution, uniformly stirring and filtering to obtain the water-based red ink.
Example 4
The embodiment 4 of the invention provides a flexo printing environment-friendly tipping paper water-based black ink subjected to slow drying treatment and a preparation method thereof.
The slow-drying flexo printing environment-friendly tipping paper water-based black ink comprises the following components in percentage by weight: 15% of acrylic resin; 25% of styrene-acrylic resin; 10% of plant carbon black; c.i. pigment black 710%; 2.0% of slow-drying agent; TEGO 5500.4% digao; 0.7 percent of leveling agent; 0.03 percent of defoaming agent; 0.3 percent of pH regulator; the balance being water.
The slow drying agent is prepared by the following method: in a 250mL four-necked flask, a solution was added in a molar ratio of 2: 1: 0.25 of the molar ratio of maleic anhydride, acrylic acid and butyl acrylate is 2: 1: 0.25, adding isopropanol accounting for 18 percent of the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate and 100mL of deionized water, heating the mixture in a water bath to 85 ℃, and dropwise adding ammonium persulfate solution under stirring, wherein the adding amount of the ammonium persulfate is 8 percent of the total mass of the maleic anhydride, the acrylic acid and the butyl acrylate. Reacting at the constant temperature of 85 ℃ for 2h, cooling to room temperature, adding acetone into the reacted solution to precipitate a product, and drying the product to obtain the maleic anhydride-acrylic acid-butyl acrylate copolymer. A preparation method of a slow-dry-processed flexo printing environment-friendly tipping paper water-based black ink comprises the following steps:
(1) adding the acrylic resin, the plant carbon black and the C.I. pigment black 7 in the ratio into water, stirring for 30min in a high-speed impeller stirrer, and uniformly stirring to obtain a first mixed solution;
(2) grinding the first mixed solution in a grinding machine for 360min to obtain ink color paste;
(3) adding the slow drying agent, the digao TEGO550, the flatting agent and the defoaming agent in the ratio into the printing ink color paste, stirring for 30min, and uniformly stirring to obtain a second mixed solution;
(4) and adding the styrene-acrylic resin and the pH regulator in the ratio into the second mixed solution, uniformly stirring and filtering to obtain the aqueous black ink.
Comparative example 1
This is in contrast to example 1, except that no slow drying agent was added to the ink formulation.
Comparative example 2
This is in contrast to example 2, except that no slow drying agent was added to the ink formulation.
Comparative example 3
This is in contrast to example 3, except that no slow drying agent was added to the ink formulation.
Comparative example 4
This is in contrast to example 4, where no slow drying agent was added to the ink formulation.
The water-based inks prepared in examples 1 to 4 of the present invention were subjected to index tests such as ink appearance, viscosity, solid content, pH, fading, friction resistance, light resistance, heat resistance, and odor, and the test results are shown in table 1.
The water-based inks prepared in examples 1 to 4 and comparative examples 1 to 4 of the present invention were subjected to tipping paper flexo printing on-press trial, and the condition of the plate dry within 24 hours of on-press printing was observed, and the results are shown in table 2.
As shown in table 2, compared with the case of not adding the slow-drying agent, the generation of plate drying phenomenon can be effectively avoided when the flexographic printing of the water-based ink tipping paper is performed after the slow-drying agent is added.
The content of the Volatile Organic Compound (VOC) in the water-based ink prepared in the embodiments 1-4 of the invention is measured by referring to GB/T23986-:
the parameters related to the headspace-gas chromatography/mass spectrometer using the Agilent G1888-7890A/5975C were as follows:
the static headspace device has the following device conditions: 20mL of headspace bottle; sample loop, 3.0 mL; the sample equilibrium temperature is 80 ℃; the temperature of a sample ring is 160 ℃; transmission line temperature, 180 ℃; sample equilibration time, 45.0 min; sample bottle pressurization pressure, 138 kPa; pressurizing for 0.20 min; aerating for 0.20 min; sample ring equilibration time, 0.05 min; sample injection time, 1.0 min.
Gas chromatograph, instrument conditions were as follows: a capillary column (VOCOL column or equivalent column) special for VOC, the specification is [60m (length) × 0.32mm (inner diameter) × 1.8 mm (film thickness) ]; carrier gas: helium (He), constant flow mode, flow 2.0 mL/min; sample inlet temperature: c, 180 ℃; the split ratio is as follows: 20: 1; temperature programming: and (3) keeping the temperature at 40 ℃ for 2min, heating to 200 ℃ at the rate of 4 ℃ per min, and keeping the temperature for 10 min.
Mass spectrometer, instrument conditions were as follows: auxiliary interface temperature: c, 220 ℃; an ionization mode: an electron impact source (EI); ion source temperature: c, 23 ℃; ionization energy: 70 eV; temperature of the quadrupole rods: c, 150 ℃; a full-scanning monitoring mode, wherein the scanning range is 29 amu-350 amu; and selecting an ion monitoring mode, wherein the qualitative and quantitative ions are specified by YC207-2014 standard.
Volatile Organic Compounds (VOCs) tested included methanol, ethanol, isopropanol, acetone, n-propanol, methyl ethyl ketone, ethyl acetate, isopropyl acetate, n-butanol, benzene, propylene glycol methyl ether, n-propyl acetate, 2-ethoxyethanol, 4-methyl-2-pentanone, propylene glycol ethyl ether, toluene, n-butyl acetate, ethylbenzene, xylene, styrene, 2-ethoxyethyl acetate, cyclohexanone, dimethyl succinate, dimethyl glutarate, dimethyl adipate. The measurement results are shown in Table 3.
As seen from Table 3, the total amount of VOCs in the water-based ink prepared by the invention is less than 5%, and the quality is more excellent.
The present invention is not limited to the above-described specific embodiments, and various modifications and variations are possible. Any modifications, equivalents, improvements and the like made to the above embodiments in accordance with the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The flexo printing environment-friendly tipping paper water-based ink subjected to slow drying treatment is characterized by comprising the following components in percentage by weight:
11% -20% of acrylic resin;
the dilution resin is 18% -37%;
10% -22% of pigment;
1-2.5% of slow-drying agent, wherein the slow-drying agent is a maleic anhydride-acrylic acid-butyl acrylate copolymerization compound;
0.3% -0.8% of wetting agent;
0.6% -1.0% of a leveling agent;
0.01% -0.1% of defoaming agent;
0.1% -0.5% of pH regulator;
the balance being water.
2. The slow-drying flexographic environment-friendly tipping paper water-based ink is characterized in that the molecular weight of the slow-drying agent is 3000-10000, and the slow-drying agent is prepared by the following method:
adding an initiator into an aqueous solution containing maleic anhydride, acrylic acid, butyl acrylate and a chain transfer agent, and reacting for 2-3 hours at 80-90 ℃ to obtain a polymer solution;
and adding the polymer solution into acetone, separating out a precipitate, and drying to obtain the slow drying agent.
3. The slow-dry processed flexo environmentally friendly aqueous tipping paper ink according to claim 1, wherein the let-down resin is at least one of: styrene-acrylic resins, polyurethane resins.
4. The slow-dry processed flexo environmentally friendly tipping paper aqueous ink according to claim 1, wherein the wetting agent is digao TEGO550 or Dow Corning DC 67.
5. The slow-dry processed flexographic environment-friendly tipping paper aqueous ink according to claim 4, characterized in that the pH regulator is ethanolamine.
6. The slow-dry-processed flexo environmentally friendly tipping paper water-based ink according to any one of claims 1 to 5, wherein the pigment is titanium dioxide and kaolin.
7. The slow-dry-processed flexo environmentally friendly tipping paper water-based ink is characterized in that the pigment is iron oxide yellow and kaolin.
8. The slow-dry-processed flexo environmentally friendly tipping paper water-based ink is characterized in that the pigment is iron oxide red and kaolin.
9. The slow-dry-processed flexo environmentally friendly tipping paper water-based ink according to any one of claims 1 to 5, wherein the pigment is plant carbon black and C.I. pigment black 7.
10. A preparation method of a slow-drying-treated flexo printing environment-friendly tipping paper water-based ink is characterized by comprising the following steps:
adding acrylic resin and pigment into water, and uniformly stirring to obtain a first mixed solution;
grinding the first mixed solution into ink color paste;
adding a slow drying agent, a wetting agent, a flatting agent and a defoaming agent into the ink color paste, and uniformly stirring to obtain a second mixed solution; the slow drying agent is a copolymer of maleic anhydride-acrylic acid-butyl acrylate;
and adding a thinning resin and a pH regulator into the second mixed solution, uniformly stirring and filtering to obtain the water-based ink.
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