KR101301594B1 - Method for preparing the environment-friendly ink composition comprising and dye-pigment copolymer colorants and super molecular polymer - Google Patents

Abstract

The present invention relates to a method for preparing an ink jet ink composition comprising an aqueous-based dye-pigment copolymer and multifunctional polymer particles for environmentally friendly digital inkjet printing. The present invention comprises the steps of preparing a dye-pigmented copolymer or an ultrahigh molecular weight polymer having a weight average molecular weight of 700,000,000 to 750,000,000; Encapsulating the dye-pigmented copolymer or the ultrahigh molecular weight polymer using a polymer and an inorganic material; Dispersing the encapsulated dye-pigment copolymerized pigment or encapsulated ultra high molecular weight polymer in a milling machine to prepare an ink composition stock solution having an average particle size of 10 to 120 nm; Preparing a ink composition by adding a reactive chemical to the ink composition stock solution to adjust viscosity, surface tension and viscosity; And it provides a method for producing an ink composition for inkjet printing comprising the step of filtering the prepared ink composition with a membrane.

Description

Method for preparing the environment-friendly ink composition comprising and dye-pigment copolymer colorants and super molecular polymer}

The present invention relates to a method for preparing an ink jet ink composition comprising an aqueous-based dye-pigment copolymer and multifunctional polymer particles for environmentally friendly digital inkjet printing.

With the development of printing techniques using inkjets, ink compositions for printing various types of fibers have been produced. In general, the inkjet printing method can be roughly divided into a direct printing method and a thermal transfer printing method using a thermal transfer system for transferring to paper. The direct printing method has the advantage that no additional process of printing on paper is required since the image is printed directly from the inkjet printer machine to the textile. However, since the washing and fixing process is required after the printing is completed, a separate facility is required, and there is a problem in that wastewater harmful to humans or the environment is generated in a series of processes.

In contrast, in the case of textile printing using a conventional digital sublimation transfer system, an additional process for washing and fixing is not required, so the process equipment is simple, and waste water does not occur. However, in the case of the existing digital printing system, it is difficult to completely prevent the generation of hazardous chemicals depending on the type of the ink composition. In particular, sulfonated lignin, formaldehyde, N, N-dimethylformamide, and dimethyl sulfoxide (Dimethyl), which are present in digital sublimation transcription systems and petroleum solvent dilute UV curing systems sulfoxide, hydrazine and morpholine are regulated by the US Food and Drug Agency as hazardous or toxic. The Environmental Protection Agency (EPA) also offers Acetonitrile, Dimethyl Sulfate, Diethanolamine, N, N-Dimethylformamide, Formaldehyde, Hydrazine, Methyl ethyl ketone, triethylamine, dimethyl sulfoxide (DMSO), morpholine (Morpholine), sodium hydroxide (NaOH), tetrahydrofuran (THF) ) And urea are defined as hazardous chemicals. Korea National Institute of Environmental Research defines methyl ethyl ketone, trimethylamine, ethyl acetate, hydrazine, sodium hydroxide, dimethyl sulfate and formaldehyde as hazardous substances.

A technique for sublimable disperse dyes in relation to printing inks is disclosed in Korean Patent Publication No. 10-2004-0045158. The patent discloses a method for producing a water-soluble printing ink which is heated to 90 to 110 ° C using dimethyl sulfoxide as an organic solvent, dissolved or diluted for 3 hours or more, and then cooled.

Another prior art related to inkjet textile printing ink compositions is Korean Patent Publication No. 10-2003-0074369. The patent discloses an inkjet textile printing ink composition comprising a container solvent having at least one reactive dye, water and at least one alcohol group. Ink compositions set forth in this patent include acetic acid, sodium acetate, phosphoric acid, sodium phosphate, boric acid, sodium borate, sodium tetraborate and sodium citrate.

Another technique for reactive dyes is Australian published patent AU200051869. The patent discloses a transfer method using an inkjet printer, which contains NaOH or DMSO, which is harmful to a human body, as an ink composition.

Currently known inkjet printing salt compositions are prepared using dimethylsulfoxide, sodium acetate or other harmful organic solvents. The use of such harmful organic solvents is to improve the output quality of the ink during the inkjet printing process. Specifically, organic solvents containing such harmful chemicals have been used to make emulsion forms having high dispersibility and high stability in the form of pigment particles. However, the use of such a harmful solvent not only has a harmful effect on the worker in the work process, but also may cause harmful gas and waste water problems due to by-products of the process.

Recently, in order to replace this, the UV curing system, which is a direct printing method, is adopted. UV curing systems, however, are difficult to apply to the general graphics and textile industries because of the high system cost and the high maintenance costs of the device. UV curable ink systems are used in special applications such as electronics, electricity, shipbuilding, automobiles, etc., but are not suitable as physicochemical coloring mechanisms of digital textile inkjet inks. In traditional digital textile inks, dyes and pigments (inks) are dyed (attached) to the fibers by dyeing mechanisms. Therefore, cellulose fibers use reactive dyes, polyesters use disperse dyes, and textile materials such as silk, wool, and nylon There is a disadvantage to use acid dyes.

Currently, the digital printing process can be easily carried out using a digital textile printing system compared to the conventional printing process, but there is a problem that the pre and post-treatment process of the fabric for preventing ink bleeding and improving dye fixability is still complicated. Recently, developed countries and overseas dye and pigment manufacturers have been actively researching ink for DTP (Digital Textile Printing) which can be used for all kinds of fabrics, but there are no known commercial products as the initial stage of R & D.

In addition, in the existing printing process and digital printing process, the pre-post treatment process according to the fabric is very important for obtaining the optimum printing material. The pretreatment process on the fabric using separate equipment and pretreatment agents-printing-steam steaming treatment- Complex processes such as rinsing-drying and anti-wrinkling are required. In addition, water pollution occurs due to the use of pretreatment processes such as urea and urea, and environmental problems are caused by non-fixed reactive dye dyes and unremoved pretreatment materials after cellulosic fabric printing.

In order to solve this problem, US Patent Publication No. US2006 / 0089422 A1 discloses a technique of inking a polymer that can replace a material used as a pretreatment agent, and synthesizes a polymer coated with a water-soluble and biodegradable coating agent. To disclose inkjet inks. In the patent, there is an advantage that the production process is shortened because printing and coating treatment are simultaneously performed without additional pre and post treatment additional equipment.

In the present invention, through the modification and synthesis of the dye-pigmentation to offset the advantages and disadvantages of the existing disperse dyes and pigments complement each other to achieve physicochemical stabilization, to provide a method for producing a digital textile ink having functionality such as anion emission I would like to. In addition, a method for producing a dye-pigment composition for digital textiles, which can be applied to all kinds of fabrics by using ultra-high molecular weight polymer inkjet ink simultaneously, does not require pre- and post-treatment, and does not emit harmful substances during the curing process. To provide.

The ink composition for inkjet digital printing prepared in the present invention is capable of similar color expression and color reproduction for various kinds of printed materials, has high resolution, and can be used for various inkjet heads.

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In order to solve the above problems, according to a preferred embodiment of the present invention, preparing a dye-pigmented copolymer pigment; Encapsulating the dye-pigmented copolymer with a polymer and an inorganic substance; Dispersing the encapsulated dye-pigment copolymer dye using a milling machine to prepare an ink composition stock solution; Preparing an ink composition by adding a pH buffer solution, a thickener, a surface tension regulator and a moisturizer to the ink composition stock solution to adjust surface tension and viscosity; And it provides a method for producing an ink composition for inkjet printing comprising the step of filtering the prepared ink composition with a membrane.
According to another suitable embodiment of the present invention, the encapsulating step is a copolymer of at least two compounds selected from the group consisting of styrene, acrylate, methylmethacrylatepolyethyl-propyloxide, modified silicone and fluorine, and Titanium dioxide, silicon dioxide, aluminum oxide, zinc oxide, indium tin oxide is characterized in that the organic / inorganic hybrid layer is formed by adding to the mixed solution of two or more inorganic materials.
According to another suitable embodiment of the present invention, in the digital textile printing system using the ink composition prepared above, and including a color analysis and matching system, the color analysis and matching system comprises: a starting step; Recognizing the to-be-printed object; Reviewing the defined color profiling; Execution determination using a color analysis and matting hardware system; Image segmentation step; A hardware parallel processing step; A defined color profiling database update step; Applying modified definition profiling; And shutting down the system.

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The present invention enables color expression and color reproduction similar to the conventional method for various kinds of printed materials without using harmful chemicals, and can be used for various inkjet heads. Since the ink composition prepared in the present invention does not emit harmful chemicals in the curing process, it does not adversely affect workers and the environment.

In addition, since a separate pre- and post-treatment process is not required, printing can be completed by a simple process.

1 schematically illustrates a manufacturing process of an ink composition according to the present invention.
Figure 2 schematically shows the synthesis process of the dye-pigmented copolymer pigment according to the present invention.
Figure 3 schematically shows the synthesis process of the dye-pigmented copolymer pigment according to the present invention.
4 schematically illustrates a circuit diagram of a light curing system according to the present invention.
5 schematically shows a hardware / software color analysis and matching system of a printer according to the present invention.
Figure 6 schematically illustrates the ink encapsulation and overall printing process according to the present invention.

The present invention relates to a method for producing an inkjet ink comprising a dye-pigmented copolymer dye. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings.

1 schematically illustrates a manufacturing process of an ink composition according to the present invention.

Referring to Figure 1, the manufacturing process of the ink composition according to the present invention comprises the steps of selecting a dye-pigment (S11); Synthesis step (S12-1) of the dye-pigmentation copolymer pigment; Ultra-high molecular weight polymer particle polymerization step (S12-2); Production step of milling dispersion solution (S13); Milling dispersion step S14; An ink formular step (S15); And a microfiltration step (S16).

1. Dye-pigment selection step ( S11 )

In order to proceed with a printing process on textiles through direct printing, an ink composition comprising a dye-pigmented copolymer dye should be prepared. To this end, first, a dye and a pigment must be selected. The dyes and pigments may be composed of cyan, magenta, yellow and black, and several auxiliary colors. The dye-pigment copolymerized pigment according to the present invention may include two or more of the dyes and pigments described below for each color.

Teal

Pigment: C.I. Pigment Blue 15; C.I. Pigment Blue 15: 1; C.I. Pigment Blue 15: 2; C.I. Pigment Blue 15: 3; C.I. Pigment Blue 15: 4; C.I. Pigment Blue 60; C.I. Pigment Blue 190; C.I. Pigment Blue 192; C.I. Pigment Blue 204; C.I. Pigment Blue 288

Disperse Dyes: C.I. Disperse Blue 14; C.I. Disperse Blue 19; C.I. Disperse Blue 56; C.I. Disperse Blue 60; C.I. Disperse Blue 72; C.I. Disperse Blue 79; C.I. Disperse Blue 87; C.I. Disperse Blue 134; C.I. Disperse Blue 148; C.I. Disperse Blue 165; C.I. Disperse Blue 180; C.I. Disperse Blue 183; C.I. Disperse Blue 326; C.I. Disperse Blue 354; C.I. Disperse Blue 359; C.I. Disperse Blue 360

Direct dyes: C.I. Direct Blue 190; C.I. Direct Blue 191; C.I. Direct Blue 192

Natural Dyestuff: Anthocyanin

Shenhong

Pigment: C.I. Pigment Red 13; C.I. Pigment Red 48; C.I. Pigment Red 48: 1; C.I. Pigment Red 48: 2 ;, C.I. Pigment Red 122; C.I. Pigment Red 184; C.I. Pigment Red 187; C.I. Pigment Red 202; C.I. Pigment Red 228; C.I. Pigment Violet19

Disperse Dyes: C.I. Disperse Red 54; C.I.Disperse Red 60; C.I. Disperse Red 86; C.I. Disperse Red 91; C.I. Disperse Red 92; C.I. Disperse Red 343; C.I. Disperse Red 356

Reactive dyes: C.I. Reactive Red 21; C.I. Reactive Red 22; C.I. Reactive Red 23

Natural dyes: Carmine A; Carmine b

yellow

Pigment: C.I. Pigment Yellow 27; C.I. Pigment Yellow 54; C.I. Pigment Yellow 109; C.I. Pigment Yellow 110; C.I. Pigment Yellow 150; C.I. Pigment Yellow 151; C.I. Pigment Yellow 154; C.I. Pigment Yellow 155

Disperse Dyes: C.I. Disperse Yellow 5; C.I. Disperse Yellow 42; C.I. Disperse Yellow 54; C.I. Disperse Yellow 64; C.I. Disperse Yellow 79; C.I. Disperse Yellow 82; C.I. Disperse Yellow 93; C.I. Disperse Yellow 119; C.I. Disperse 160

Direct dyes: C.I. Direct Yellow 130; C.I. Direct Yellow 131; C.I. Direct Yellow 132

Acid dyes: C.I. Acid Yellow 20; C.I. Acid Yellow 23

Natural Dye: Flavonoid

black

Pigment: C.I. Pigment Black 7, C.I. Pigment Black 35, C.I. Pigment black 41

Direct dyes: Poly azo; Poly phenol

Natural Dye: Sepia color

White

Pigment: CI Pigment White 6, CI Pigment White 7, CI Pigment White 23

etc

Pigments: CI Pigment Violet 23, CI Pigment Orange 36,, CI Pigment Orange 43, CI Pigment Green 7, CI Pigment Green 36, Phtalocyanine, White Carbon, Lithopone, Zinc Oxide, Aluminum Oxide, Indium Tin Oxide, Gold, Silver, Chopper , Fe ₂ O ₃ , Lithium, Magnesium, Barium sulfide

Among the dyes, dyes that are not allergic and carcinogenic may be selected, as set forth in the provisions of the European Oeko-Tex Standard 100. Specifically, blue is C.I. Disperse Blue 56, C.I. Disperse Blue 60, C.I. Disperse Blue 72 or C.I. Disperse Blue 359 is preferred.

Red is C.I. Disperse Red 54, C.I.Disperse Red 60 or C.I. Disperse Red 86 is preferred. And yellow is C.I. Disperse Yellow 42, C.I. Disperse Yellow 54, C.I. Disperse Yellow 82, and C.I. Disperse Yellow 119 is preferred. In the present invention, the dye-pigment copolymerized pigment may be prepared by copolymerizing two or more dyes selected from the group consisting of the dyes and two or more pigments selected from the group consisting of the pigments.

Especially as a pigment | dye pigment, a bright red: quinacridone type, a cyan: phthalocyanine type, a yellow: benzoimidazoline type, and a black: carbon black type pigment are preferable. Especially as a dye pigment | dye, a bright red: quinine type, a cyan: anthraquinone type, a yellow: imine diazole type, and a black: white carbon type dye are preferable.

The pigment and the dye is preferably used in a proportion of 20 to 80wt% dye, 80 to 20wt% based on the weight of the pigment 1Kg powder.

2. Dye-pigment copolymerization pigment synthesis step ( S12 -One)

Figure 2 schematically shows the synthesis process of the dye-pigment copolymerized pigment according to the present invention. Referring to FIG. 2, the synthesis process of the dye-pigment copolymerized pigment may include a Ziegler-Natta reaction step (E11); Dilute hydrochloric acid and sodium hydroxide semi-crystallization step (E12); Photodimerization reaction step (E13); And organic / inorganic encapsulation step (E14).

Specifically, first, the dyes and pigments of red, blue, yellow, and black selected above are copolymerized by a Ziegler-Natta reaction (E11).

As the pigment dye, it is preferable to select a bright red: quinacridone type, a cyan: phthalocyanine type, a yellow: benzoimidazoline type, and a black: carbon black type pigment. It is preferable to select a yellow: imine dissol type and a black: white carbon dye.

The pigments and dyes are added to the mixed solution of 10 ~ 30wt% of the mixed powder by adding a continuous catalyst of Ag-Au-Pt 1 ~ 3wt% of the total weight of the mixed solution, Ziegler-Natta reaction (Ziegler-Natta reaction) to polymerize the dye-pigment copolymer (E11).

Next, the synthesized copolymer is crystallized using 0.1N HCl solution and 0.1N NaOH solution (E12). The dye-pigment pigment is converted into a crystallization (mass) of the dye-pigment pigment which is blended by a ligand reaction of an acid (0.1 N HCl) -base (0.1 N NaOH). Specifically, in order to induce crystallization of the pigment, the dye-pigment copolymer is dropped into 0.1N HCl solution to make a semi crystal, and then, 0.1N NaOH solution is added to neutralize it, and 1N, an oxidation-reducing agent, is added. It is dripped at the biscarbonate or disodium sulfonate solution of this.

Next, in a helium atmosphere, 0.1-1 wt% of benzoic peroxide (BPO, Benzoicperoxide), which is a light (ultraviolet) and a heat (infrared) initiator, is added to the total weight of the mixed solution, and light by heat (infrared) and light (ultraviolet) Photonic isomer reaction is carried out to prepare a dye-pigment copolymerized pigment (E13).

Finally, the dye-pigmented copolymer dye is added to an aqueous solution in which a copolymer of at least two selected from the group consisting of styrene, acrylate, methyl methacrylatepolyethyl-propyloxide, modified silicone and fluorine is mixed and then stirred. Next, at least two selected from the group consisting of inorganic materials (titanium dioxide, silicon dioxide, aluminum oxide, zinc oxide, indium tin oxide (ITO) After preparing the mixed aqueous solution, the polymer-coated pigment is added and stirred to encapsulate the organic / inorganic hybrid layer on the outside of the pigment (E14) .The inorganic encapsulation is light (ultraviolet band: 100-400 nm). ) Encapsulation is achieved by the deposition of inorganics outside the pigment body in water by Compton scattering and Rayleigh scattering with energy of heat (infrared band: 800 to 2500 nm).

The encapsulation process may also be carried out by an electrostatic spray dry method. In the case of using the electrostatic spray drying method, the polymer and the inorganic material are added to an aqueous solution containing a solvent and dissolved therein, followed by spraying and drying the electrostatic spray dry method on an electrically charged metal plate to perform an encapsulation process. Conduct. The final manufactured pigment has a particle diameter of 0.1 to 120 nm and forms particles close to the three-dimensional circle.

Scheme 1 schematically shows a copolymerization process of the dye-pigment copolymerized pigment of the present invention. According to the following scheme, a phthalocyanine-based dye and an anthraquinone-based dye are copolymerized by Ziegler-Natta reaction to prepare a phthalocyanine-based dye-pigment copolymer.

[Reaction Scheme 1]

3. Ultra high molecular weight polymer particle polymerization step ( S12 -2)

In the present invention, ultra-high molecular weight high molecular particles are prepared separately from the dye-pigment copolymerized pigment. The polymer particles produced in this process are encapsulated and made of a multilayer, thus having high functionality and multifunctionality. The prepared organic-inorganic hybrid encapsulated polymer particles have a weight average molecular weight (Mw) of 700,000,000 to 750,000,000, and a number average molecular weight (Mn) of 18,000,000 to 22,000,000.

Figure 3 schematically shows the synthesis process of the polymer ink prepared in this step.

Referring to Figure 3, the process is a living ion polymerization step (P11); Atom transfer polymerization step (P12); Light addition polymerization step (P13); And organic / inorganic encapsulation step (P14).

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The prepared polymer of the present invention is added to an aqueous solution in which a copolymer of at least two selected from the group consisting of styrene, acrylate, methyl methacrylatepolyethyl-propyloxide, modified silicone and fluorine is mixed and then stirred. Next, at least two selected from the group consisting of inorganic titanium dioxide, silicon dioxide, aluminum trioxide, zinc oxide, and indium tin oxide (ITO) The mixed aqueous solution is added to encapsulate and coat the polymer and the inorganic material on the outside of the ultra high molecular weight polymer particles (P14). In the encapsulation process, organic / inorganic encapsulated polymers are manufactured by self-assembly or self-structuring without external stimulus such as light or heat. In the encapsulation process, an inorganic salt (Sodium salt, Potassium Salt, Potassium salt in Amine Salt) or an inactive metal (Fluor, Chloride, Bromine, Iodine) or clay is added. The particle size of the prepared polymer is 8 ~ 120nm.

Ultra-high molecular weight polymers, unlike dye-pigment pigment copolymerization processes, form ultrafine particles by self-assembly and self-structuring of quantum-mechanical zero gels or aerogels without initiators or external stimuli. This leads to encapsulation composed of multiple layers by the electronic Hall effect. At this time, in order to prevent additional reversible phenomena such as re-coherence, sedimentation or spinodalphenomena, inorganic salts (potassium salts among sodium salts, potassium salts, and amine salts) and inert metals (fluo, Chloride, Bromine, Iodine) or clay are added to form static electronic electrophoresis. The final state becomes a flowable viscoelastic fluid which is reversible to light (ultraviolet) and heat (infrared) in a gel state.

Scheme 2 below briefly illustrates a process for preparing transparent ultrahigh molecular weight polymer particles.

[Reaction Scheme 2]

4. Step of preparing a polymer dispersant solution (S13)

In order for the dye-pigment copolymer to be sprayed through the inkjet nozzle, first, it must be dispersed to make a size that can be ground. Deionized water is used as a dispersion solvent for dispersing the dye-pigment copolymer. In addition, KOH acid number 200, Amine acid number 500, density to produce inks that can be used not only in piezoelectric heads but also in heads that generate at high temperatures under normal operating conditions, such as thermal heads. A water-soluble modified silicone-fluorine-based surfactant of 1.05 g / cm 3 was added and stirred sufficiently to prepare a polymer dispersant solution.

Into the prepared polymer dispersant (surfactant) solution, the dye-pigment copolymerized pigment prepared above is added to be wetted and dispersed while slowly stirring. Finally, 15 to 30 wt% of a water-soluble silicone based polymer surfactant; 15 to 35 wt% of a dye-pigmented copolymer pigment; And 50 to 70 wt% of ultrapure water and a dye-pigmented copolymer pigment dispersion solution having a viscosity is prepared.

5. Milling Dispersing Process (S14)

The dye-pigment copolymer copolymer dye or polymer particle reversible gel stock solution dispersed (mixed / blended) in the dye-pigment copolymerized pigment dispersion solution is sprayed through the inkjet nozzle because the particle size grows up to a submicro emulsion size. Inappropriate. Therefore, the present invention is characterized in that the dye or polymer particle reversible gel stock solution is dispersed through a dispersion process.

In the present step, the polymer particles in the polymer particle reversible gel stock solution showed a particle size of about 80 to 120 nm as the aggregated state. In this step, the gel stock solution is treated with a milling machine and dispersed in a suspension to form a minimum particle size. When the dispersion step is completed, the average particle size of the polymer particles is about 10-30 nm.

The dispersion process is premilled (rotational speed of 500 to 3000 RPM) and fine milling (rotational speed of 1000 to 8000 RPM) before the process goes to the ultrafine process to produce a wide range of nano-level dispersions. Through the inkjet nozzles to be suitable to be dispersed.

In the ultra-fine milling process, 0.1 to 5 mm of zirconium-silica carbide-hafnium beads are placed in a milling machine and rotated at a speed of 2000 to 16000 RPM to uniformly disperse the pigment and polymer (milling time 90 min /). 1 Kg). Through such a milling process, a dispersion stock solution or a polymer particle reversible gel stock solution of a dye-pigmented copolymer dye having a monodisperse distribution is prepared. In the dispersing process, the beads are preferably added at about 60 to 90% of the total volume of the chamber of the mill. For milling operations, machines with ultrafast milling using zirconium-silicon carbide-halfium beads can be used for laboratory wet grinding equipment such as NETZSCH's Labstar, which is commercially available. When the ultra-fine milling dispersion process is completed, the dye-pigmentation copolymer pigment dispersion stock solution or the ultra-high molecular weight polymer gel stock solution is completed.

6. Ink composition manufacturing step ( S15 )

An ink constituent chemical is added to the dye-pigment copolymerized pigment dispersion solution or the ultra-high molecular weight polymer dispersion solution prepared in the above step to prepare an inkjet ink. Ink constituent chemicals are generally added to improve the stability, dispersibility or adhesion of the ink composition. The ink constituents to be added should consider the maintenance and improvement of ink properties such as surface tension, viscosity, pH, and storage stability, while at the same time being harmless to humans and the environment. Such reactive chemicals include, for example, potassium hydroxide pH buffer solutions; Thickeners such as polyethylene glycol, ethylene glycol or diethyl glycol; Surfactants, surface tension modifiers and humectants.

Surfactants that are surface tension regulators in the above are alpha olefin sulfonate (α-olefin-sulfonate), sodium hydroxy dodecane sulfonate, sodium n-dodecane sulfonate, alkyl sulfonate, sodium 2-dodecane sulfonate, It is preferable that it is at least 1 sort (s) chosen from the group which consists of a succinic acid ester sulfonate and sodium dioctyl sulfosuccinate. The surfactants are generally the same surfactants used in water-born inks.

Airproducts' Surfyno l104, 420, 440, 465, 485, 504, CT-141, 151, 171, 211, 221, 231, Dynol 604, Zetasperse 1200, 1400, 1600, 2100, 2300, 2500, 3100, 3400, Surfactants such as 3700, Envirogem AD01, AE01, 02, 03, 360; Surfactants such as Tego 240, 250, 260, 270, 280, 500, 505, Disperse 740, 750, 760 from Degussa; Surfactants such as BYK's BYK 023, 024, 027, 028, Dispers, Disperse 180, 184, 190, 191, 192, 193; Surfactants such as Solsperse 27000, 40000, 41000, 41090, 42000, 44000, 46000, 47000 from Lubirazol can be used.

In the above, the moisturizing agent may be glycerin, butylene glycol, or propylene glycol, or a mixture thereof.

The reactive chemicals as described above are added to the dye-pigmented copolymer dye stock solution or the ultra-high molecular weight polymer dispersion stock solution and stirred for 2 to 3 hours to prepare an ink composition.

The prepared ink composition preferably contains 10 to 40 wt% of the reactive chemicals based on the total weight of the ink composition, and the ultrapure water includes 40 to 70 wt% of the total weight of the ink composition.

Among the reactive chemicals, the pH buffer solution is 0.1 to 1 wt%, the thickener is 25 to 35 wt%, the surface tension control agent is 0.1 to 1 wt%, the antifoam is 0.1 to 1 wt%, and the moisturizing agent is 0.5 based on the total weight of the ink composition. It is preferable that it is to 15 wt%.

Reactive chemicals mixed with dye-pigmented copolymer stock solutions or ultra high molecular weight polymer stock solutions are stirred in the reactor. Mechanics tires can be used, for example, PLHP 30000 HS of Poonglim Co., Ltd., which is commercially available.

7. Precision filtration

The prepared ink composition removes impurities generated or mixed in the manufacturing process and filters out particles having a predetermined level or more. The microfiltration process is carried out by the housing, the aspirator and the ultra precision membrane filter paper. This microfiltration process removes byproducts from the ink.

The ink containing the dye-pigment copolymerized pigment and the ultra high molecular weight polymer prepared in the present invention is a lignin-based dispersant such as sulfonic greenin, acetonitrile, dimethylsulfate, dimethanolamine, N, N-dimethylformamide, It does not emit harmful substances such as formaldehyde, hydrazine, methylethylketone, triethylamine, dimethylsulfoxide, morpholine, sodium hydroxide, tetrahydrofuran or urea.

8. Printing process

An ink jet ink composed of an ink containing a dye-pigment copolymer or an ultra high molecular weight polymer particle may be formed at a room temperature by forming a photocuring device in a print, thereby accelerating the curing speed of the ink. The circuit diagram of the curing system used in the present invention is shown in FIG. In addition, the x86-based or RISC-based processor (ARM, Intel, AMD, VIA, IBM, etc.) by giving a color analysis and matching system for color representation and reproduction in the printing process using the copolymerized pigment ink and the polymer ink prepared in the present invention It is automated with parallel processing of 32 / 64bit microprocessor, making it possible to have faster color expression system.

5 shows a flowchart of a color analysis and matching system according to the present invention.

5, the color analysis and matching system according to the present invention includes a hardware / software color analysis and matching system start step T11 of the printer; Recognizing a to-be-printed object (T12); A defined color profiling review step T13; Execution determination step T14 using the color analysis and matching hardware system; Image segmentation step T15; Hardware parallel processing step T16; A defined color profiling database update step (T17); Applying a modified definition profiling (T18); And a system shutdown step (T19).

The color profiling review step T13 defined above is a kind of discrimination step. Specifically, when the user wants to use something other than paper as the to-be-printed material, ICC profiling is used to predetermine colors. The ICC profiling is a process of determining the amount of color to be printed, and is a step of determining how data to be printed can be represented by standard values. In this step, a commercially available color profiling program can be used.

Hereinafter, the present invention will be described in detail with reference to Preparation Examples and Examples, but the scope of the present invention is not limited by the Examples.

Manufacturing example  One: blue  dyes- Production of Pigment Copolymer

The phthalocyanine-based blue pigment in powder form and the anthraquinone-based blue dye are mixed at a weight ratio of 1: 4. Mixed powder of the dye and the pigment in a mixed solution of 200 g of water, 200 g of solvent N-methylpyrrolidone, 250 g of co-solvent dimethyl sulfoxide and 100 g of non-solvent tetrabutyl alcohol in a nitrogen atmosphere at a standard atmospheric pressure of 1 ATM and a temperature of 298.15 K. Add 250 g. 3 g of Ag-Au-Pt continuous catalyst (manufactured by Sigma-Aldrich) is added to the mixed solution to which the pigment and the dye are added, and a copolymer is prepared by a Ziegler-Natta reaction.

Next, in order to induce the crystallization of the synthesized pigment, to prepare a semi crystal by dropping the copolymerized dye-pigment copolymer dye in 1000ml of 0.1N HCl solution, to neutralize it, 1000ml of 0.1N NaOH solution is added, 1000 ml of a solution of 1 N biscarbonate or disodium sulfonate, which is an oxidation-reducing agent, is added dropwise.

Next, 1 g of benzoic peroxide (BPO), which is an initiator, is added in a helium atmosphere, and then subjected to photonic isomer reaction by heat and light to prepare a blue dye-pigment copolymer dye.

250 g of the copolymerized pigment is added to an aqueous solution containing 250 g of a styrene-acrylate copolymer of Sigma-Aldrich as a dispersant and stirred. Next, 2.5 g of titanium dioxide was added to the aqueous solution, followed by addition of light (ultraviolet band: 100 to 400 nm) and heat (infrared band: 800 to 2500 nm) for a predetermined time to obtain a blue dye-pigment copolymerized pigment encapsulated with a polymer and an inorganic substance. Manufacture.

Preparation Example 2 Preparation of Red Dye-Pigment Copolymer

Powdered quinacridone-based red pigment and quinine-based red dye are mixed in a weight ratio of 3: 7. Mixing of the dye and the pigment in a mixed solution of 210 g of water, 210 g of solvent N-methylpyrrolidone, 210 g of cosolvent dimethyl sulfoxide, and 50 g of non-solvent tetrabutyl alcohol under a standard atmosphere of 1 ATM, a temperature of 298.15 K in a nitrogen atmosphere. 270 g of powder are added. 3 g of a continuous catalyst of Ag-Au-Pt (manufactured by Sigma-Aldrich) is added to the mixed solution to which the pigment and the dye are added, and the dye-pigment copolymerized pigment is polymerized by Ziegler-Natta reaction.

Next, in order to induce the crystallization of the synthesized pigments, the copolymerized dye-pigment copolymerized pigments were added dropwise to 1000ml of 0.1N HCl solution to make a semi crystal, and to neutralize them, 1000ml of 0.1N NaOH solution was added, 1000 ml of 1 N biscarbonate or disodium sulfonate solution as redox agent is added dropwise.

Next, 2 g of benzoic peroxide (BPO), which is an initiator, is added in a helium atmosphere, followed by photonic isomer reaction by heat and light to prepare a blue dye-pigment copolymer dye.

270 g of the copolymerized pigment is added to an aqueous solution containing 270 g of a styrene-acrylate copolymer of Sigma-Aldrich, followed by stirring. Next, after adding 2.7 g of titanium dioxide to the aqueous solution, light (ultraviolet band: 100 to 400 nm) and heat (infrared band: 800 to 2500 nm) are added for a predetermined time to prepare an encapsulated red dye-pigment copolymer dye.

Manufacturing example  3: yellow dye-pigment Copolymer Pigment  Manufacture process

A powdered benzoimidazoline-based yellow pigment and an iminediazole-based yellow dye are mixed at a weight ratio of 1: 1. The dye-pigment powder was mixed in a mixed solution of 200 g of water, 300 g of solvent N-methylpyrrolidone, 100 g of cosolvent dimethyl sulfoxide, and 150 g of non-solvent tetrabutyl alcohol under a standard atmosphere of 1 ATM, at a temperature of 298.15 K in a nitrogen atmosphere. Add 250 g. 2 g of a Ag-Au-Pt continuous catalyst (Sigma-Aldrich) is added to the mixed solution to which the pigment and the dye are added, and the dye-pigment copolymerized pigment is polymerized by Ziegler-Natta reaction.

Next, in order to induce the crystallization of the synthesized pigments, the copolymerized dye-pigment copolymerized pigments were added dropwise to 1000ml of 0.1N HCl solution to make a semi crystal, and to neutralize them, 1000ml of 0.1N NaOH solution was added, 1000 ml of 1 N biscarbonate or disodium sulfonate solution) as an oxidation-reducing agent.

Next, 0.5 g of benzoic peroxide (BPO), which is an initiator, is added in a helium atmosphere, and then subjected to photonic isomer reaction by heat and light to prepare a blue dye-pigment copolymer dye.

250 g of the copolymerized pigment is added to an aqueous solution containing 250 g of a styrene-acrylate copolymer of Sigma-Aldrich, followed by stirring. Next, after adding 2 g of titanium dioxide to the aqueous solution, light (ultraviolet band: 100 to 400 nm) and heat (infrared band: 800 to 2500 nm) are added for a predetermined time to prepare an encapsulated yellow dye-pigment copolymer.

Preparation Example 4 Preparation of Black Dye-Pigment Copolymer

Powdered carbon black black pigment and white carbon black dye are mixed at a weight ratio of 7: 3. The dye-pigment powder was mixed in a mixed solution of 220 g of water, 220 g of solvent N-methylpyrrolidone, 230 g of cosolvent dimethyl sulfoxide, and 60 g of non-solvent tetrabutyl alcohol under a standard atmosphere of 1 ATM, a temperature of 298.15 K in a nitrogen atmosphere. Add 240 g. 1g of a continuous catalyst of Ag-Au-Pt (manufactured by Sigma-Aldrich) is added to the mixed solution to which the pigment and the dye are added, and the dye-pigment copolymerized pigment is polymerized by Ziegler-Natta reaction.

Next, in order to induce the crystallization of the synthesized pigments, a copolymerized dye-pigment copolymerized pigment was added dropwise to 1000ml of 0.1N HCl solution to make a semi crystal, and to neutralize it, 1000ml of 0.1N NaOH solution was added, It is dripped at 1000 ml of 1 N biscarbonate or disodium sulfonate solutions which are redox agents.

Next, 0.4 g of benzoic peroxide (BPO), which is an initiator, is added in a helium atmosphere, and then subjected to photonic isomer reaction by heat and light to prepare a blue dye-pigment copolymer dye.

240 g of the copolymerized pigment is added to an aqueous solution containing 240 g of a styrene-acrylate copolymer of Sigma-Aldrich, followed by stirring. Next, 3 g of titanium dioxide is added to the aqueous solution, followed by addition of light (ultraviolet band: 100 to 400 nm) and heat (infrared band: 800 to 2500 nm) for a predetermined time to prepare an encapsulated black dye-pigment copolymer dye.

Manufacturing example  5

Ultra high molecular weight polymer particles are prepared by the following method. Sigma-Aldrich

100 g of acetylated chitosan, 250 g of gluco-pyrano-furanopolycellulose, 250 g of polyvinyl alcohol, 100 g of polyethyl-propyloxide, 200 g of gelatin, and 50 g of agar were mixed with 150 g of ultrapure water to prepare 1.1 Kg of solution.

To this solution was added 400 g of dimethyl sulfoxide, 300 g of 2-pyrrolidone, and 100 g of methyl alcohol from Fluka Corporation under a nitrogen atmosphere of 1 ATM at a standard pressure of 298.15 K, followed by 2 g of Ag-Au continuous catalyst and azobisisobutyl. 1 g of nitrile was added, and 2 g of isopropyl acrylamide-ethyldioctylthiophene-ascorbic-cinnemite from Alfa-acsar was added to polymerize to prepare a polymer particle reversible gel stock solution containing ultrahigh molecular weight polymer particles. The polymer in the gel stock solution has a weight average molecular weight (Mw) of 720,000,000 and a number average molecular weight (Mn) of 20,000,000.

To an aqueous solution containing 400 g of a styrene-acrylate copolymer of Sigma-Aldrich, it is added to 400 g of the ultrahigh molecular weight polymer particle reversible gel stock solution, followed by stirring. Next, 50 g of titanium dioxide was added to the aqueous solution, and 25 g of polyethylene glycol determinate potassium salt and 5 g of clay were added and mixed to prepare encapsulated polymer particles. The particle size of the prepared polymer is 80 ~ 120nm.

Example  One

400 g of ultrapure water was mixed with 280 g of Joncryl-690, a polymer dispersant used by BASF, to prepare an aqueous dispersion solution. 280 g of the blue dye-pigment copolymer dye prepared in Preparation Example 1 was sufficiently blended into the prepared dispersion solution, and then put into a mill. After milling for about 5 hours in the milling process, a dye-pigmented copolymer blue pigment blue dispersion solution having an average particle of 100 nm was prepared. The pigment ink according to the present invention was prepared by adding the following ink component chemicals to the prepared dye-pigment copolymer blue pigment dispersion.

12 wt% of a blue dye-pigment copolymer polychromate master dispersion;

Ultrapure water 55 wt%;

Diethyl glycol 28 wt% (thickener);

Butanediol 2 wt% (humidant);

Sodium hydroxydodecanesulfonate 1 wt% (surfactant);

Sulfinol-465 1 wt% (surfactant); And

1,2-aminopropanediol 1wt% (pH buffer)

The prepared dye ink was filtered using a member filter. The final pigment ink prepared after filtration had a surface tension of 33 dyne / cm, viscosity 3.2 cp; And pH 9.3.

The prepared dye ink was injected into the cartridge and output 30m from Epson's Stylus Pro 9400, Hewlett Packard Designer jet z2100, Canon's Canon IPF 700, and the like with a photocuring device. No ejection of the nozzle occurred during the test, and the printed image showed good results in the durability test.

Example  2

A pigmented ink was prepared in the same manner as in Example 1 except that a mixed ethylene glycol solution was used as a thickener instead of diethylene glycol, a mixed diol solution was used as a moisturizer instead of butanediol, and the composition composition ratio of the ink was changed. It was. In this case, 280 g of a red dye-pigment copolymer was prepared in Preparation Example 2. Components and composition ratios for the preparation of a pigment ink containing a red dye-pigment copolymerized pigment having an average particle size of 110 nm are as follows.

Red dye-pigment copolymer colorant master dispersion 14wt%;

Ultrapure water 50 wt%;

Mixed ethylene glycol solution 28 wt% (thickener);

6 wt% of mixed diol solution (humidant);

Sodium hydroxydodecanesulfonate 1 wt% (surfactant);

Sulfinol-465 0.8 wt% (surfactant); and

0.2 wt% potassium hydroxide (buffer)

The mixed ethylene glycol solution was prepared in the following composition ratio.

Ethylene glycol 10-40 wt%;

Diethylene glycol 20 to 50 wt%;

Triethylene glycol 1-10 wt%;

Tetraethylene glycol 0.5 to 5 wt%;

Polyethylene glycol 0.5 to 3 wt%; And

The amount that makes the total composition ratio of ultrapure water 100 wt%

And the mixed diol solution was prepared in the following composition ratio.

Glycerin 20 to 60 wt%;

Butanediol 1-30 wt%;

Propanediol 1-20wt;%

Hexadiol 0.5-10 wt%;

Normal methylpyrrolidone (NMP) 0.2 to 5 wt%;

0.5-8 wt% 2-pyrrolidone;

Amount for the total composition ratio of ultrapure water to be 100 wt%

The prepared dye ink was filtered using a member lane filter.

The prepared dye ink had a surface tension of 33 dyne / cm; Viscosity 3.2 cPs; And pH 9.1. In the same manner as in Example 1, output was made using equipment such as Stylus Pro 9400, Epson's Hewlett Packard Designer jet z2100, and Canon's Canon IPF 700. As in Example 1, the output image had good results in the durability test.

Example  3

500 g of ultrapure water was mixed with 400 g of BYK Disperse 180 to prepare an aqueous dispersion solution. In addition, 260 g of the yellow dye-pigment copolymer pigment prepared in Preparation Example 3 was sufficiently blended into the prepared polymer dispersant, and a yellow dispersion stock solution having an average particle of 90 nm was prepared by performing a milling process for about 5 hours with a mill. The pigment ink according to the present invention was prepared by adding the following reactive chemicals to the prepared yellow dispersion stock solution.

Yellow dispersion stock solution 18 wt%;

Ultrapure water 60.5 wt%;

Ethyl glycol 18 wt%;

Butanediol 2wt%;

Sodium hydroxydodecanesulfonate 0.8 wt%;

Sulfinol-465 0.5 wt%; And

Potassium Hydroxide 0.2 wt%

The prepared dye ink was filtered using a member lane filter. The resulting ink had a surface tension of 36.2 dyne / cm; Viscosity 2.8 cPs; And pH 8.7. 30m output from Epson's Stylus Pro 9400, Hewlett Packard Designer jet z2100, and Canon's Canon IPF 700. No dropping of the nozzle occurred during the test, and the printed image showed good results in the durability test.

Example  4

Mixed propylene glycol solution in place of diethylene glycol as a thickener; Using a mixed diol solution in place of butanediol as a moisturizing agent, and a black pigment ink having a particle size of 70nm was prepared by varying the composition ratio. The mixing ratio of the components for producing the dye ink is as follows.

Black dispersion stock 14 wt%;

Ultrapure water 48 wt%;

30 wt% of mixed propylene glycol solution;

Mixed diol solution 6wt%;

Sodium hydroxydodecanesulfonate 1 wt%;

Sulfinol-465 0.8 wt%; And

Potassium Hydroxide 0.2 wt%

Mixed propylene glycol solution was prepared in the following composition ratio.

Propylene glycol 10-40 wt%;

Dipropylene glycol 20-60 wt%;

1-10 wt% tripropylene glycol;

0.5 to 3 wt% polypropylene glycol; And

Amount to make ultra pure water total composition ratio 100 wt%

And the mixed diol solution was prepared in the following composition ratio.

Glycerin 20 to 60 wt%;

Butanediol 1-30 wt%;

1 to 20 wt% propanediol;

Hexadiol 0.5-10 wt%;

Normal methylpyrrolidone (NMP) 0.2 to 5 wt%;

0.5-8 wt% 2-pyrrolidone;

Amount for the total composition of ultrapure water to be 100 wt%

The prepared dye ink had a surface tension of 33 dyne / cm; Viscosity 3.2 cPs; And pH 9.0. Filtering was performed in the same manner as in Example 1, and output using equipment such as Stylus Pro 9400, Epson's Hewlett Packard Designer jet z2100, and Canon's Canon IPF 700. As in Example 1, the output image had good results in the durability test.

Example  5

Mixed propylene glycol solution in place of diethylene glycol as a thickener; A polymer ink was prepared by using a mixed diol solution in place of butanediol as a moisturizer, and adding a gel stock solution containing the polymer prepared in Preparation Example 5. Through the milling process in the same manner as in Example 1 to prepare a polymer ink having a particle size of 30nm. The mixing ratio of the components for preparing the polymer ink is as follows.

37 wt% of a polymer particle reversible gel stock solution;

Ultrapure water 40 wt%;

15 wt% of mixed propylene glycol solution;

Mixed diol solution 6wt%;

Sodium hydroxydodecanesulfonate 1 wt%;

Sulfinol-465 0.8 wt%; And

Potassium Hydroxide 0.2 wt%

Mixed propylene glycol solution was prepared in the following composition ratio.

Propylene glycol 10-40 wt%;

Dipropylene glycol 20-60 wt%;

1-10 wt% tripropylene glycol;

0.5 to 3 wt% polypropylene glycol; And

The amount that makes the total composition ratio of ultrapure water 100 wt%

The prepared polymer ink was injected into a cartridge and mounted on one print to which a photocuring device was attached, and then output. The print used the Stylus Pro 9400 from Epson, Hewlett Packard Designer jet z2100, and Canon IPF 700 from Canon.

Example  6

The dye ink prepared in Example 1 and the polymer ink prepared in Example 5 were respectively injected into the cartridge and outputted so that the post-chromosome ink and the polymer ink, which were mounted on one print with a photocuring device, were sprayed simultaneously. The print used the Stylus Pro 9400 from Epson, Hewlett Packard Designer jet z2100, and Canon IPF 700 from Canon.

Example  7

Using the printer of Stylus Pro 9400, Hewlett Packard Designer jet z2100, Canon Canon IPF 700 from Epson, the pigment ink prepared in Example 1 was first printed on the to-be-printed material, and the polymer ink prepared in Example 5 was then placed thereon. Printed.

Comparative Example  One

750 g of distilled water, 150 g of Joncryl-690, C.I. Direct Blue 190, C.I. Reactive Red 23, C.I. 160g of Reactive Yellow 13 and Black Poly AZO, respectively, were sufficiently stirred to prepare a dispersion solution. The prepared dispersion solution was added to a bead mill and milled for about 8 hours to prepare a dye dispersion stock solution having an average particle size of about 70 nm. The following chemicals were added to the obtained dispersion stock solution to prepare a reactive dye ink.

Blue dye dispersion stock 16 wt% to 20 wt%;

Ethylene glycol 16 wt% to 20 wt%;

2 wt% of dimethyl sulfoxide; And

46 wt% to 54 wt% of distilled water;

The disperse dye ink prepared was tested in the printing equipment of Epson's Stylus Pro 9400, Hewlett Packard Designer jet z2100, and Canon's Canon IPF 700. Some nozzles were dropped during the test, and the washing resistance was very poor in the washing process after the curing process.

The output of Comparative Example 1, Example 1 using only the dye ink, Example 6 using the dye ink and the polymer ink at the same time, and the dye ink were output first, and the output of Example 7 in which the polymer ink was output thereon was compared. . When the maximum range that can be expressed by the printer specified by the International Standard for Illumination (CIE Lab 1976) is 100%, the color reproduction range is 80-90. In Example 1, Example 6, and Example 7 were excellent also in color power immediately after printing and 24 hours after a print time also in color power.

Comparative Example  2

50 g of naphthalene copolymers in 750 g of distilled water and C.I. Disperse Blue 60, C.I. Disperse Red 60, C.I. Disperse Yellow 54, C.I. Each 200g of Disperse Black 54 was added and stirred well. The prepared dispersion solution was added to a bead mill and milled for about 8 hours to prepare a blue dispersion stock solution having an average particle size of about 100 nm. The following reactive chemicals were added to the obtained CDP type dispersion sublimation dye dispersion stock solution to prepare a CDP type dispersion sublimation dye ink.

CDP type dispersion sublimation dye dispersion stock solution 18 wt% to 20 wt%;

Diethylene glycol 18 wt% to 20 wt%;

DMSO 2 wt%;

NaOH 4 wt%; And

50wt% distilled water

The CDP type dispersion sublimation dye ink was tested on output equipment such as Epson's Stylus Pro 9400, Hewlett Packard Designer jet z2100, and Canon's Canon IPF 700. No nozzle was released during the test. Hazardous substances during the curing process are not emitted, but the generation of small amounts of methane increases the yellowing of the printed matter and the air pollution in the indoor space. Later washing was very good in the washing process, but fell far below the standard in the light resistance test.

When the maximum range that can be expressed by the printer specified by the International Standard of Illumination (CIE Lab 1976) was 100%, the color reproduction range was shown. It was. Also in color power, Example 1 showed no difference in color power from Comparative Example 2 immediately after printing and after 24 hours of printing time.

Comparative Example  3

In 600 g of distilled water, 200 g of styrene / acrylate / methyl methacrylate polymer, Surfynol-CT 171 of Airproduct, disper-180 of BYK, tego-750 of Degussa, and 760, respectively, were added to C.I. Pigment Blue 15: 3, C.I. Pigment Red 122, C.I. Pigment Yellow 155, C.I. 200g of 4 colors of Pigment Black 7 were added and thoroughly stirred. The prepared dispersion solution was added to a bead mill and milled for about 8 hours to prepare a dispersion stock solution having an average particle size of about 50 nm. A pigment ink was prepared by adding the following reactive chemicals to the obtained dispersion stock solution.

Pigment dispersion stock solution 24wt%;

Diethylene glycol 10 wt%;

Dipropylene glycol 20 wt%;

Glycerol 6wt%; and

50wt% distilled water

The pigment ink was tested by an output device such as Stylus Pro 9400, Hewlett Packard Designer jet z2100, and Canon IPF 700, Canon. No nozzles were removed during the test and no harmful substances were released during the curing process. However, a small amount of methane gas produced increased yellowing of the printed matter and air pollution in the interior space. Later, in the washing process, the washing resistance and light resistance test were very good, but the friction resistance fell far below the standard.

Example 6 showed a color reproducibility of 80-90% compared to Comparative Example 3, but Example 7 and Example 1 appeared to have a color reproducibility almost similar to that of Comparative Example 3. In terms of color power, there was no difference in color power immediately after printing and after 24 hours of printing time.

The present invention has been described in detail through the above embodiments. The presented embodiments are exemplary and can be variously modified and modified by those skilled in the art without departing from the spirit of the present invention. The invention is not limited by these modifications and variations, but is limited by the claims appended hereto.

Claims (6)

In the method for producing an ink composition for inkjet printing,
Preparing a dye-pigmented copolymer pigment;
Encapsulating the dye-pigmented copolymer with a polymer and an inorganic substance;
Dispersing the encapsulated dye-pigment copolymer dye using a milling machine to prepare an ink composition stock solution;
Preparing an ink composition by adding a pH buffer solution, a thickener, a surface tension regulator and a moisturizer to the ink composition stock solution to adjust surface tension and viscosity; And
Method for producing an ink composition for inkjet printing comprising the step of filtering the prepared ink composition with a membrane. delete delete delete delete delete

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