Basic ink composition for digital printing and printing method using same

Abstract

The present invention relates to a composition for printing, the composition comprising a binder, a solvent, and a reaction controller. When the composition of the present invention is used, ink composition components may be easily coagulated on the surface of an object, and the obtainable object image quality or abrasion resistance may be further enhanced.

Description

Basic ink composition for digital printing and printing method using the same

[0001] The present invention relates to an ink composition for digital printing and a printing method using the same.

[0002] Inkjet printing is performed in small batches of various contents on various types and shapes of substrates, such as fabric surfaces, to print high-quality color images. Inkjet printing is a broad technology that records characters and patterns on a printed surface by ejecting a stream of a specific liquid ink composition as tiny droplets from a cluster of microscopic nozzles (printheads) in response to electrical signals generated by a microprocessor. A typical inkjet printing system records characters, symbols, and patterns by converting electrical signals into mechanical signals for continuous or on-demand ejection of ink composition continuously supplied and stored in the nozzle head section.

[0003] Ink compositions suitable for inkjet printing include aqueous ink compositions and non-aqueous solvent-based ink compositions. More commonly used inkjet compositions are aqueous ink compositions, which typically contain water and a colorant, typically a dye or pigment dispersion, and may further contain a number of additives to impart specific properties to the ink being applied (see published application JP 2009-215506 A). The quality of the final printed product can be determined by the composition of the ink composition used or the type of pretreatment solution or posttreatment solution. To achieve such high-quality printed products, the inventors of the present invention have developed a printing composition.

[0004] The present invention aims to provide a basic ink composition for digital printing, comprising a binder; a solvent; and a reaction regulator. Furthermore, the present invention aims to provide a digital printing method, comprising the steps of spraying the composition onto a target object; and drying the output. Furthermore, the present invention aims to provide an object printed with the composition. Furthermore, the present invention aims to provide a method for preparing a basic ink composition for digital printing by mixing a binder; a solvent; and a reaction regulator.

[0005] A basic ink composition for digital printing comprising a binder, a solvent, and a reaction regulator for achieving the above-described purpose, wherein the pH of the composition is 7 to 9, is provided.

[0006] The solvent may be one or more of divalent glycols - ethylene glycol, glycerol, diethylene glycol, propylene glycol, acetone, and dichloromethane.

[0007] The binder may be a blocked isocyanate or an acrylic-urethane polymer.

[0008] The reaction moderator may be at least one of sodium lactate aqueous solution, acetic acid, and butyl acetate.

[0009] The reaction regulator may have a mass ratio of sodium lactate aqueous solution and acetic acid of 10:1 to 15:1.

[0010] The acrylic-urethane polymer may have a ratio of acrylic to urethane of 0.5:9.5 to 1.5:8.5.

[0011] The Tg of the acrylic-urethane polymer can be between -50 degrees and -40 degrees.

[0012] It may additionally contain one or more of a surfactant, a corrosion inhibitor, and an antioxidant.

[0013]

[0014] In one specific embodiment of the present invention, a digital printing method is provided, comprising the steps of spraying the composition onto a target object; and drying the output. In the specific embodiment, the target object is any one selected from the group consisting of natural fibers, synthetic fibers, and semi-synthetic fibers, such as silk, cotton, wool, nylon, polyester, and rayon.

[0015]

[0016] In one specific embodiment of the present invention, the composition provides a printed object.

[0017] In one specific embodiment of the present invention, a method for preparing a basic ink composition for digital printing by mixing a binder; a solvent; and a reaction regulator is provided, wherein a pH regulator is added to adjust the pH of the ink composition to pH 7 to 9.

[0018] The binder may be a blocked isocyanate or an acrylic-urethane polymer.

[0019] The reaction moderator may be at least one of an aqueous solution of sodium lactate, acetic acid, and butyl acetate.

[0020] The reaction regulator may have a mass ratio of sodium lactate aqueous solution and acetic acid of 10:1 to 15:1.

[0021] In one embodiment of the present invention, a binder is a key component of ink, which serves to fix pigments or dyes to the printing material. A binder is a substance that strengthens the bond between the pigment and the printed material as the pre-treatment solution or ink dries after printing. This significantly affects the durability and quality of the final printed material. The primary functions of a binder include enhancing adhesion (allowing the ink to adhere well to the printed material), which is especially important on smooth or non-absorbent surfaces; color protection (allowing the pigment to be evenly distributed throughout the printed material), providing vivid and uniform colors; enhancing durability (after drying, the binder increases the resistance of the printed material to abrasion, fading, and chemical damage); and providing flexibility (some binders impart flexibility to the printed material, increasing its resistance to bending or other physical stresses). The type of binder used is determined based on the type of material being printed, the intended use of the printed material, and the required durability and quality standards. Although not limited thereto, for example, for binders for digital printing pretreatment, block isocyanates or acrylic-urethane polymers may be used.

[0022] In one specific embodiment of the present invention, the reaction regulator is for controlling the physicochemical properties of the ink composition during the process of being attached to the target object, and for controlling the physicochemical reaction with the ink composition after being attached to the target object. This changes the reaction environment or reaction conditions including pH, and includes, for example, but not limited to, at least one of calcium chloride dihydrate, calcium nitrate tetrahydrate, calcium magnesium dihydrate, magnesium chloride, acetic acid, lactic acid, tartaric acid, sodium lactate aqueous solution, acetic acid, and butyl acetate.

[0023] In one specific example of the present invention, the pH regulator is an agent that regulates the pH of the reaction solution,

[0024] But not limited to, any one or more of triethylamine (TEA), DEA, disodium phosphate and aminomethyl propanediol may be used, and ethylamine, propylamine, butylamine, diethylamine, dipropylamine, dibutylamine, triethylamine, tributylamine, monoethanolamine, diethanolamine, triethanolamine, 2-dimethylamino-2-methyl-1-propanol, 1-amino-2-propanol, 1-dimethylamino-2-propanol, 3-dimethylamino-1-propanol, 2-amino-1-propanol, 2-dimethylamino-1-propanol, 2-diethylamino-1-propanol, 2-diethylamino-1-ethanol, 2-ethylamino-1-ethanol, 1-(dimethylamino)2-propanol, N-methyldiethanolamine, N-propyldiethanolamine, Any one or more of N-isopropyldiethanolamine, N-(2-methylpropyl)diethanolamine, Nn-butyldiethanolamine, Nt-butylethanolamine, N-cyclohexyldiethanolamine, 2-(dimethylamino)ethanol, 2-diethylaminoethanol, 2-dipropylaminoethanol, 2-butylaminoethanol, 2-t-butylaminoethanol, 2-cycloaminoethanol, 2-amino-2-pentanol, 2-[bis(2-hydroxyethyl)amino]-2-methyl-1-propanol, 2-[bis(2-hydroxyethyl)amino]-2-propanol, N,N-bis(2-hydroxypropyl)ethanolamine, 2-amino-2-methyl-1-propanol, tris(hydroxymethyl)aminomethane, and triisopropanolamine may be used.

[0025] In one specific embodiment of the present invention, the pre-printing composition is treated with a pre-treatment liquid before attaching the ink composition, thereby facilitating the components of the ink composition to aggregate on the surface of the object, thereby further improving the image quality and friction durability of the object.

[0026] In one embodiment of the present invention, the acrylic-urethane polymer is a blend of two different types of polymers, acrylic and urethane. This blend combines the unique properties of each polymer to create a new material with unique properties. Acrylic polymers offer excellent weatherability, color stability, transparency, and gloss, making them resistant to UV rays, resistant to fading, and leaving a beautiful gloss on surfaces. Therefore, acrylics can be widely used in paints, coatings, adhesives, inks, and various plastic products. Urethane polymers have high flexibility, abrasion resistance, and chemical resistance, resulting in excellent shock absorption and a wide range of elasticity retention depending on the usage environment. This makes them suitable for a wide range of applications, including flooring, shoes, sealants, adhesives, and even automotive parts. In other words, acrylic-urethane polymer blends combine the strengths of these two polymers to create durable coatings, adhesives, sealants, and more, with physical and chemical properties varying depending on the blending ratio. Depending on the purpose, a composition for printing is provided in which the ratio of acrylic to urethane is 0.5:95 to 15:85.

[0027] In one embodiment of the present invention, the glass transition temperature (Tg) refers to the temperature at which a polymer material transitions from a hard and brittle "glassy state" to a soft, rubbery "rubber state." At this temperature, the physical properties of the polymer material change dramatically. The glass transition temperature is a key concept in understanding the thermal properties of a material. Below this temperature, the polymer material behaves as hard and brittle as glass. Above the glass transition temperature, the material becomes more flexible and elastic, and can absorb more energy. For example, the glass transition temperature is an important consideration when determining the operating temperature range of polymer materials such as plastics, rubber, and adhesives. If the temperature of the environment in which the material will be used is below the glass transition temperature, the material hardens, and if the temperature is above the glass transition temperature, the material softens. In particular, the glass transition temperature of a polymer is determined by various factors, including its structure, molecular weight, degree of crosslinking, and the presence of additives. These characteristics play a crucial role in the design and application of the material. In particular, in compositions for printing pretreatment, the Tg of the acrylic-urethane polymer is in the range of, but not limited to, -50 degrees to -40 degrees.

[0028] In one specific example of the present invention, the object refers to various printing objects selected from the group consisting of natural fibers, synthetic fibers and semi-synthetic fibers, such as silk, cotton, wool, nylon, polyester and rayon, but not limited thereto.

[0029] In one embodiment of the present invention, the drying process is a process for drying a pretreatment composition or ink composition attached to a target object. The drying temperature is not particularly limited, but may be, for example, 60 to 150°C; 100 to 150°C, or 130 to 150°C. In addition, the drying time is not particularly limited, but may be, for example, 30 seconds to 5 minutes. At such temperatures, damage to the target object can be suppressed to a low level, and printing is very suitable for a target object containing any one selected from the group consisting of nylon fibers and polyester fibers. In addition, the drying process is used after the ink attachment process, the pretreatment solution attachment process, or the posttreatment solution attachment process. The method for attaching the pretreatment composition or ink composition may be any one of an inkjet method, a bar coater, a roll coater, and a spray method.

[0030] In one embodiment of the present invention, a digital printing method refers to a technology that prints digital images directly from a computer or digital storage medium onto the surfaces of various materials. Unlike traditional printing techniques, this method outputs images without film or printing plates. It is efficient for small-scale printing or personalized printing. Digital printing uses inkjet or laser printers and can print data immediately, providing fast production speeds and high flexibility. Applications include personalized marketing material printing (printing marketing materials in batches that include personal information such as each recipient's name or address); on-demand printing (printing only the necessary amount of books or documents, reducing inventory burden compared to mass printing); high-resolution image printing (digital printers print high-resolution images directly onto various materials such as paper and canvas); variable data printing (VDP) (different images or text can be inserted into each printed material, enabling personalized printing); and large-format printing (high-definition printing of large banners, posters, signs, etc.).

[0031] In one embodiment of the present invention, the solvent is not particularly limited, but may include, for example, glycols, glycol monoethers, glycol diethers, glycol monoesters, glycol esters, nitrogen-containing solvents, monohydric alcohols, and polyhydric alcohols such as glycerin. As the glycols, there are no particular limitations, but may include, for example, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-propanediol, 1,2-butanediol, 1,2-pentanediol, 2-methylpentane 1,3-diol, 2-methylpentane 1,4-diol, 1,2-hexanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, and the like. Examples of glycol monoethers include, but are not particularly limited to, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monomethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, triethylene glycol monomethyl ether, etc. Examples of glycol diethers include, but are not particularly limited to, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, ethylene glycol methyl ether, ethylene glycol ethyl ether, etc. As glycol monoesters, there are no particular limitations, but examples thereof include ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, dipropylene glycol monomethyl ether acetate, and methoxybutyl acetate.As glycol esters, there are no particular limitations, but examples thereof include ethylene glycol diacetate, ethylene glycol acetate, propylene glycol diacetate, dipropylene glycol diacetate, ethylene glycol acetate propionate, ethylene glycol acetate butyrate, ethylene glycol acetate butyrate, ethylene glycol acetate propionate, ethylene glycol acetate butyrate, propylene glycol acetate propionate, propylene glycol acetate butyrate, dipropylene glycol acetate butyrate, dipropylene glycol acetate propionate, etc. As nitrogen-containing solvents, there are no particular limitations, but examples thereof include 2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, etc.

[0032] As the monohydric alcohol, there is no particular limitation, but examples thereof include alcohols such as methanol, ethanol, n-propyl alcohol, iso-propyl alcohol, n-butanol, 2-butanol, tert-butanol, iso-butanol, n-pentanol, 2-pentanol, 3-pentanol, and tert-pentanol. The total content of the organic solvent is 50 to 30 mass%, 75 to 275 mass%, or 15 to 25 mass% with respect to the total amount of the ink composition. When the total content of the organic solvent is within the above range, in addition to the friction durability and storage stability, the peeling resistance of the printed surface and the feel of the object tend to be further improved. In particular, the pretreatment solvent is, but is not limited to, one or more of divalent glycols - ethylene glycol, glycerol, diethylene glycol, propylene glycol, acetone, and dichloromethane.

[0033] In one specific example of the present invention, the resin particles are not particularly limited, but examples thereof include acrylic resin particles, urethane resin particles, polyester resin particles, and polyethylene resin particles. Among these, urethane resin particles can be used. By using such resin particles, in addition to friction durability and storage stability, the peeling resistance of the printed surface and the feel of the object tend to be further improved. The resin particles may be used singly, or two or more types may be used in combination. The acrylic resin particles are not particularly limited, but examples thereof include those obtained by polymerizing (meth)acrylic monomers such as (meth)acrylic acid and (meth)acrylic acid esters, and those obtained by copolymerizing (meth)acrylic monomers with other monomers. Among these, anionic acrylic resin particles can be used.

[0034] As the urethane resin particles, there are no particular limitations as long as they are resin particles having urethane bonds in the molecules, and examples thereof include polyether-type urethane resins having ether bonds in the main chain, polyester-type urethane resins having ester bonds in the main chain, and polycarbonate-containing film urethane resins having carbonate bonds in the main chain. Among these, polyether-type urethane resins or polycarbonate-containing film urethane resins can be used, and polycarbonate-containing film urethane resins can be used. In addition, from the viewpoint of improving dispersion stability, etc., anionic urethane resin particles having a carboxyl group, a sulfo group, a hydroxyl group, etc. can be used. The polyester resin particles are not particularly limited as long as they can be obtained by a reaction between an acid component and an alkyl component. Examples of formic acid components include terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, biphenyl dicarboxylic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, dodecanedioic acid, fumaric acid, maleic acid, itaconic acid, cyclohexanedicarboxylic acid, and tetrahydrophthalic acid.

[0035] In addition, examples of the argon component include glycols, etc., which are exemplified as organic solvents. In addition, the resin particles are not particularly limited, and examples thereof include non-crosslinkable resin particles and crosslinkable resin particles having a crosslinkable group. Among these, non-crosslinkable resin particles can be used. The crosslinkable group may be one that forms a crosslinked structure by reacting with a crosslinkable group, or may be one that forms a crosslinked structure by reacting with a functional group different from the crosslinkable group. By using non-crosslinkable urethane resin particles, the storage stability and the feel of the obtained object tend to be further improved. The content of the resin particles is 2.0 to 15 mass%, 3.0 to 10 mass%, or 5.0 to 8.0 mass% with respect to the total amount of the ink composition. When the content of the resin particles is 2.0 mass% or more, the dry friction durability of the obtained object tends to be further improved. In addition, since the content of resin particles is 10 mass% or less, the texture of the object, friction durability, and preservation stability of the ink composition tend to be further improved.

[0036] In one specific embodiment of the present invention, a colorant may be additionally included in the ink composition. The colorant may utilize at least one of a pigment and a dye. Among these, the ink composition of the present embodiment may be a pigment printing ink including a pigment. Since the problem of friction durability is particularly likely to occur in the case of pigment printing, it is useful as a composition. In addition, when the colorant is a pigment, it is possible to print on various objects such as cotton, polyester, and nylon. As the pigment, there are no particular limitations, but examples thereof include carbon black (CI Pigment Black 7) such as no black, lamp black, acetylene black, and channel black; inorganic pigments such as iron oxide and titanium oxide; quinacridone pigments;

[0037] Examples of organic pigments include quinacridonequinone pigments, dioxazine pigments, phthalocyanine pigments, anthrapyrimidine pigments, anthanthrone pigments, indanthrone pigments, furavanthrone pigments, perylene pigments, diketopyrrolopyrrole pigments, perinone pigments, quinophthalone pigments, anthraquinone pigments, thioindigo pigments, benzimidazoline pigments, isoindolinone pigments, azomethine pigments, and azo pigments. As dyes, there are no particular limitations, but examples thereof include acid dyes such as CI acid yellow, CI acid red, CI acid blue, CI acid orange, CI acid violet, and CI acid black; basic dyes such as CI basic yellow, CI basic red, CI basic blue, CI basic orange, CI basic violet, and CI basic black; and CI direct yellow, CI deluxe red, CI deluxe blue, CI direct orange, and CI.

[0038] Examples thereof include direct dyes such as Elect Violet and CI Direct Black; reactive dyes such as CI Reactive Yellow, CI Reactive Red, CI Reactive Blue, CI Reactive Orange, CI Reactive Violet and CI Reactive Black; and disperse dyes such as CI Disperse Yellow, CI Disperse Thread, CI Disperse Blue, CI Disperse Orange, CI Disperse Violet and CI Disperse Black. The dyes may be used singly or in combination of two or more. The content of the coloring material is 1.0 to 10 mass%, or 2.5 to 7.5 mass%, based on the total amount of the ink composition.

[0039] In one specific embodiment of the present invention, a surfactant may be additionally included in the composition. As the surfactant, there may be mentioned, but is not particularly limited, examples thereof include acetylene glycol-based surfactants, fluorine-based surfactants, and silicone-based surfactants. As the acetylene glycol-based surfactant, there may be mentioned, but is not particularly limited, examples thereof include, but are not limited to, alkylene oxide adducts of 2,4,7,9-tetramethyl-5-crepe de syn-4,7-diol and 2,4,7,9-tetramethyl-5-crepe de syn-4,7-diol, and alkylene oxide adducts of 2,4-dimethyl-5-crepe de syn-4-ol and 2,4-dimethyl-5-crepe de syn-4-ol. Examples of fluorine-based surfactants include, but are not particularly limited to, perfluoroalkyl sulfonates, perfluoroalkyl carboxylates, perfluoroalkyl phosphate esters, perfluoroalkyl ethylene oxide adducts, perfluoroalkyl betaines, and perfluoroalkyl amine oxide compounds. Examples of silicone-based surfactants include polysiloxane-based compounds and polyether-modified organosiloxanes. The content of the surfactant is 0.1 to 1.0 mass% or 0.1 to 0.5 mass% with respect to the total amount of the ink composition. Examples of the polyurethane resin include, but are not particularly limited to, a polyether-type urethane resin including an ether bond in the main chain, a polyester-type urethane resin including an ester bond in the main chain, and a polycarbonate-containing film urethane resin including a carbonate bond in the main chain. The polyester resin is not particularly limited, but examples thereof include those obtained by the reaction of an acid component and an alkyl component. The acid component and the alkyl component may be the same as those described above. The acrylic resin may be a resin polymerized from a monomer containing at least acrylate or acrylic acid, and may also contain other monomers such as styrene. The resin content is 1.0 to 10 mass%, 1.5 to 10 mass%, or 2.5 to 7.5 mass%.

[0040] In one specific example of the present invention, an inkjet head used in an inkjet method is a head that ejects an ink composition toward a target object and performs output, and the head has a cavity that ejects the ink composition from a nozzle, a discharge driver that provides a driving force for ejection to the ink composition, and a nozzle that ejects the ink composition outside the head. The discharge driver can be formed using an electromechanical conversion element such as a piezoelectric element that changes the volume of the cavity according to mechanical deformation, or an electronic thermal conversion element that generates heat to generate bubbles in ink and ejects them.

[0041] Various embodiments of the present invention are described with reference to the drawings. In the following description, various specific details, such as specific configurations, compositions, and processes, are set forth to provide a thorough understanding of the present invention. However, certain embodiments may be practiced without one or more of these specific details, or in conjunction with other known methods and configurations. In other instances, well-known processes and manufacturing techniques are not described in specific detail so as not to unnecessarily obscure the present invention. Reference throughout this specification to an embodiment means that a particular feature, configuration, composition, or characteristic described in connection with the embodiment is included in one or more embodiments of the present invention. Thus, the appearance of an embodiment in various places throughout this specification does not necessarily indicate the same embodiment of the present invention. Additionally, the particular features, configurations, compositions, or characteristics may be combined in any suitable manner in one or more embodiments.

[0042] When the composition of the present invention is used, the components of the ink composition become more easily aggregated on the surface of the object, and the image quality and friction durability of the object that can be obtained can be further improved.

[0043] In addition, by implementing the pH of the composition to be 7 to 9, corrosion due to oxidation of the device (e.g., print head, etc.) in which the composition is used may not occur.

[0044] Figure 1 illustrates the preprocessing action and process.

[0045] Hereinafter, the present invention will be described in more detail through examples. These examples are intended solely to illustrate the present invention more specifically, and it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples, in accordance with the gist of the present invention.

[0046] While specific aspects of the present invention have been described in detail above, it should be apparent to those skilled in the art that these specific descriptions are merely exemplary and do not limit the scope of the present invention. Therefore, the substantial scope of the present invention is defined by the appended claims and their equivalents.

[0047]

[0048] 1. Preparation of pretreatment agent and ink composition

[0049] 1.1. Pretreatment solution

[0050] The pretreatment solution was prepared as shown in the table below:

[0051] Composition and weight ratio of pretreatment agentIngredientsManufacturing exampleReaction regulatorMagnesium chloride1Acetic acid4Lactic acid / sodium lactate5Tartrate10Total weight20SolventPropylene glycol10Dichloromethane30PigmentCarbon black15BinderAcrylic-urethane polymer resin5AdditiveSurfactant, corrosion inhibitor, antioxidant20Total weight(%)100

[0052] Each component was placed in a mixing tank to obtain the composition described in Table 1 above, mixed and stirred, and filtered through a membrane filter of 5 to 10 μm to obtain a pretreatment solution for each manufacturing example. The numerical values ​​of each component shown in each example in Table 1 above represent mass (w / w)% unless otherwise specified. 1.2. Ink Composition

[0053] Composition and weight ratio of ink composition Components Manufacturing example 1 Manufacturing example 2 Manufacturing example 3 Manufacturing example 4 Manufacturing example 5 Manufacturing example 6 Reaction regulator Sodium lactate aqueous solution 710 155 1214 Acetic acid 755 1533 Butyl acetate 650 553 Total weight 20 20 20 20 20 20 Solvent Dihydric glycols - Ethylene glycol 10 000 10 10 Glycerol 0 10 00 58 Diethylene glycol 0 10 0 15 10 Propylene glycol 0 0 0 10 12 Acetone 0 0 0 30 0 Dichloromethane 30 30 30 27 00 Total weight 40 40 40 40 40 Pigment Carbon black 15 15 15 15 15 15 Binder block Isocyanate 5 0 5 0 5 5 Acrylic-urethane polymer resin 0 5 0 5 10 15 Additive Surfactant, corrosion inhibitor, Antioxidant202020201010Total weight (%)100100100100100100

[0054] To obtain the composition described in Table 2 above, each component was placed in a mixing tank, mixed and stirred, and filtered through a membrane filter of 5 to 10 μm to obtain an ink composition. The numerical values ​​of each component shown in each example in Table 2 above represent mass (w / w)% unless otherwise specified. Materials commonly used in Tables 1 and 2 above are as follows:

[0055] Pigment: Carbon black (Orient Chemical Industry Co., Ltd., product name BONJET BLACK CW-1)

[0056] Surfactant: Orphin E1010 (Nissin Chemical Industries, Ltd., acetylene glycol-based surfactant)

[0057] Corrosion inhibitor: Benzotriazole (ChemWorld 506, ChemWorld)

[0058] Antioxidant: Butylated Hydroxytoluene (Lab Alley)

[0059]

[0060] 2. Preparation of pretreatment agent and ink composition

[0061] 2.1. Attachment and drying of pretreatment solution

[0062] Pretreatment liquid attachment is a process of attaching a pretreatment liquid to a target object, with the area where the pretreatment liquid is attached and the area where the ink composition is attached overlapping each other. That is, after applying to the target object with a pickup rate of 80%, heating at 100°C for 3 minutes was performed before the next ink attachment process.

[0063]

[0064] 2.2. Attachment and drying of ink composition

[0065] The ink attachment process involved spraying the ink composition prepared in Example 1 through an inkjet head using an inkjet printer PM-870 C (manufactured by Seiko Epson Co., Ltd.) to fix the ink composition to an object and drying it in the same manner as the pretreatment liquid drying method of 2.1.

[0066]

[0067] 3. Evaluation of pretreatment agents and ink compositions

[0068] 3.1. Preservation stability

[0069] The printed matter manufactured through the above Examples 1 and 2 was placed in a sample bottle, sealed tightly, and then the glass bottle was placed in a thermostatic bath at 40°C and stored for two weeks. Using a vibrating viscometer, the viscosity before and after storage was measured in accordance with JIS Z8809, and the viscosity change rate after two weeks of storage was calculated, and the storage stability was evaluated according to the evaluation criteria below. If the storage stability evaluation is A or B, it can be said that good results were obtained.

[0070] A: Viscosity change rate is 3% or less

[0071] B: Viscosity change rate is between 3% and 5%

[0072] C: Viscosity change rate exceeds 5%

[0073]

[0074] 3.2. Abrasion resistance

[0075] The ink composition of Example 1 was filled into a cartridge of an inkjet printer PM-870 C (manufactured by Seiko Epson Co., Ltd.). After filling, a nozzle check pattern was printed to confirm that there was no filling defect or nozzle loading. The ink weight ejected per dot was set to about 40 ng for the target object (polyester (PES) or nylon 100%, plain weave) to which the pretreatment solution of Example 1 was applied, and the ink adhesion density in the longitudinal and transverse directions was printed at 360 × 360 dpi. In addition, the pretreatment solution was applied to the target object so as to have a pickup rate of 80%, and then attached by heating at 100°C for 3 minutes. After that, a polyester resin (Dongyangbang Co., Ltd., Byronar MD2000)

[0076] A 5 wt% treatment solution was applied using an inkjet printer and heated at 140°C for 3 minutes to obtain a printed matter. The obtained printed matter was evaluated for friction durability according to ISO-105 X12. The evaluation criteria are shown below. If the friction durability evaluation is A to C, it can be said that good results were obtained.

[0077] A: Wet friction exceeds level 3

[0078] B: Wet friction level 3

[0079] C: Wet friction level 2-3

[0080] D: Wet friction level 2 or lower

[0081]

[0082] 3.3. Touch

[0083] For the prints obtained in step 3.2 above, the impression was directly touched with the palm of the hand and the texture was judged according to the following criteria. The judgment was conducted by three people, and the opinion with the most support was considered the result. If the judgment was divided into individual opinions, the median opinion was judged.

[0084] A: The stamped part is hard and the feel is almost the same as the original object.

[0085] B: The stamped part is hard or the texture is slightly different from the original object, but there is no problem using it.

[0086] C: The stamped part is hard or the texture is worse than the original object, but within the acceptable range.

[0087] D: The stamped part is hard or the texture is worse than the original object, and is in an unacceptable range.

[0088]

[0089] 3.4. Peeling resistance

[0090] The printed matter obtained in 3.2 above was subjected to a load of 10 gf / cm and left for one week. The printed matter was then folded in half and opened to check for peeling on the printed surface. Based on the results, peel resistance was evaluated. The evaluation criteria are as follows.

[0091] A: No adhesion or peeling is recognized on the printed surface.

[0092] B: Adhesion is recognized on the printed surface, but peeling is not recognized.

[0093] C: Slight peeling is observed on the printed surface.

[0094] D: Peeling is recognized on the printed surface.

[0095]

[0096] 3.5. Environmental adaptability

[0097] The ink composition composed of ingredients with relatively high safety for the human body was evaluated as A, and the others were evaluated as B.

[0098]

[0099] 4. Evaluation Results

[0100] The evaluation results are shown in the table below.

[0101] Evaluation results by ink composition combination Evaluation Manufacturing example 1 Manufacturing example 2 Manufacturing example 3 Manufacturing example 4 Manufacturing example 5 Manufacturing example 6 Preservation stability ABAAAA Friction durability AABBAA Touch BABBAB Peeling resistance BBAAAB Environmental adaptability BBAAAA

[0102] While specific aspects of the present invention have been described in detail above, it should be apparent to those skilled in the art that these specific descriptions are merely exemplary and do not limit the scope of the present invention. Therefore, the substantial scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A basic ink composition for digital printing comprising a binder; a solvent; and a reaction regulator, A composition having a pH of 7 to 9.

2. In paragraph 1, A composition wherein the solvent is at least one of dihydric glycols - ethylene glycol, glycerol, diethylene glycol, propylene glycol, acetone, and dichloromethane.

3. In paragraph 1, The binder is a composition which is a block isocyanate or acrylic-urethane polymer.

4. In paragraph 1, The reaction regulator is a composition comprising at least one of sodium lactate aqueous solution, acetic acid, and butyl acetate.

5. In paragraph 4, The reaction regulator is a composition having a mass ratio of sodium lactate aqueous solution and acetic acid of 10:1 to 15:

1.

6. In paragraph 3, Acrylic-urethane polymer is a composition having a ratio of acrylic to urethane of 0.5:9.5 to 1.5:8.

5.

7. In paragraph 6, A composition having an acrylic-urethane polymer Tg of -50 degrees to -40 degrees.

8. In paragraph 7, A composition further comprising at least one of a surfactant, a corrosion inhibitor, and an antioxidant.

9. A step of preparing an output by spraying the composition of paragraph 1 onto the target object; and Comprising a step of drying the above output; Digital printing method.

10. In paragraph 9, The above object is a composition for printing on any one selected from the group consisting of natural fibers, synthetic fibers and semi-synthetic fibers, such as silk, cotton, wool, nylon, polyester and rayon.

11. An object on which the composition of paragraph 1 is printed.

12. A method for producing a basic ink composition for digital printing by mixing a binder, a solvent, and a reaction regulator. A method of adding a pH adjuster to adjust the pH of an ink composition to pH 7 to 9.

13. In paragraph 12, The binder is a block isocyanate or acrylic-urethane polymer.

14. In paragraph 12, A method wherein the reaction regulator is at least one of a sodium lactate aqueous solution, acetic acid, and butyl acetate.

15. In paragraph 14, The reaction regulator is a method in which the mass ratio of sodium lactate aqueous solution and acetic acid is 10:1 to 15:1.

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