Ink set, liquid discharge device, liquid discharge method, ink and pretreatment liquid

Abstract

To provide an ink set which enables formation of a printed matter having excellent friction fastness even when a fabric is subjected to pretreatment.SOLUTION: An ink set for a fabric contains a pretreatment liquid, and ink, wherein the ink contains water, an organic solvent, a resin and a pigment, a coefficient of static friction of an image after the pretreatment liquid is imparted to the fabric, then the ink is imparted thereto, and is heated is 0.47 or less, 6 mass% or more of the resin is contained in the ink, the ink contains silicone oil or 0.5 mass% or more of a wax in the ink in terms of solid content, and the pretreatment liquid contains 35 mass% or less of a coagulant in the pretreatment liquid.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an ink set, a liquid ejection device, a liquid ejection method, an ink, and a pretreatment liquid. [Background technology]

[0002] Inkjet printers have advantages such as low noise, low running costs, and ease of color printing, and are widely used in ordinary homes as digital signal output devices. In recent years, inkjet printers are not only used for home use, but are also used for printing on low-permeability media such as coated paper, non-absorbent media such as plastic film, and fabrics such as woven and knitted fabrics. Inkjet printers are now required to achieve image quality comparable to that of conventional analog printing.

[0003] In the textile printing field, the market size for direct printing using water-based inks on clothing such as T-shirts and fabric substrates before sewing is expanding year by year. In addition to the traditional cotton and cotton-polyester blend media, demand for sportswear is rapidly increasing, and compatibility with polyester media is required. This is leading to an ever-increasing demand for inkjet recording systems that can produce images with excellent color development and various fastness properties on a variety of materials, including cotton and polyester.

[0004] Dye inks using reactive dyes or acid dyes are widely used in these fields, but dye inks have the disadvantage of placing a heavy burden on the environment because the post-treatment process involves a washing step using large amounts of water. Therefore, expectations are growing for pigment inks, which have the simplicity of post-treatment, which requires only a heating step, and also, as the need for compatibility with a variety of substrates increases as mentioned above, from the perspective of versatility that can be used on any substrate.

[0005] For example, Patent Document 1 discloses an aqueous pigment inkjet ink that is excellent in storage stability, jetting properties, color development, and texture when used for textile printing, and also aims to have high washing and friction fastness. Patent Document 2 discloses an inkjet pigment textile printing ink composition that aims to achieve both color development and friction fastness in recorded materials.

[0006] However, because pigment inks are constructed so that solids adhere to fibers, there is a problem in that image peeling is noticeable when the final printed material is rubbed. Adding a large amount of fixing components is considered to solve this problem, but this has the disadvantage of making the printed material feel rough and impairing the tactile feel that is important in the apparel industry. Furthermore, pretreatment is often performed to prevent ink bleed-through and bleeding and ensure image sharpness, and bleeding is suppressed when pretreatment is performed. For example, Patent Document 3 discloses an ink set that improves image gloss and ink fixation by preventing the liquids from mixing with each other. Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the prior art, when a treatment liquid and ink are used on fabric, even greater abrasion resistance is required.

[0008] An object of the present invention is to provide an ink set that can form images having excellent rub fastness even when fabrics are pretreated. [Means for solving the problem]

[0009] In order to solve the above problems, the ink set of the present invention is an ink set for fabrics comprising a pretreatment liquid and an ink, wherein the ink comprises water, an organic solvent, a resin, and a pigment, and the static friction coefficient of an image formed after applying the pretreatment liquid to a fabric and then applying the ink and heating is 0.47 or less, the resin is contained in the ink at 6% by mass or more, the ink contains silicone oil or contains wax in the ink at 0.5% by mass or more in terms of solid content, and the pretreatment liquid contains a coagulant in the pretreatment liquid at 35% by mass or less. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an ink set that can form images having excellent rub fastness even when fabrics are pretreated. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of a liquid ejection device. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of an ink tank. DETAILED DESCRIPTION OF THE INVENTION

[0012] The ink set, liquid ejection device, liquid ejection method, ink, and pretreatment liquid according to the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the following embodiments, and other modifications, additions, corrections, deletions, and other changes can be made within the scope of what a person skilled in the art can conceive. Any aspect is within the scope of the present invention as long as it achieves the functions and effects of the present invention.

[0013] (ink set, ink and pretreatment liquid) The ink set of the present invention is an ink set for fabrics comprising a pretreatment liquid and an ink, the ink comprising water, an organic solvent, a resin and a pigment, and wherein the static friction coefficient of an image formed after applying the pretreatment liquid to a fabric and then applying the ink and heating is 0.47 or less, the resin is contained in the ink at 6% by mass or more, the ink contains silicone oil or contains wax in the ink at 0.5% by mass or more in terms of solid content, and the pretreatment liquid contains a coagulant in the pretreatment liquid at 35% by mass or less.

[0014] According to the studies of the present inventors, when the static friction coefficient of the image formed after applying a pretreatment liquid to a fabric, applying an ink, and then heating is 0.47 or less, the image is guaranteed to have good resistance to friction, and an image having excellent resistance to friction can be obtained even when the fabric is pretreated. When the static friction coefficient exceeds 0.47, the resistance to friction of the image deteriorates.

[0015] In order to ensure that the static friction coefficient of the image formed after applying the pretreatment liquid and ink to the fabric and heating it is 0.47 or less, for example, wax may be added to the ink, or silicone oil may be added to the ink.

[0016] The method for measuring the static friction coefficient is not particularly limited, but is typically as follows: A pretreatment liquid is ejected onto a fabric, followed by an ink, and then the fabric is heated to form an image. The image is, for example, a solid image. A solid image cut to a length of approximately 15 cm is placed in an automatic friction and wear analyzer TSf-503 manufactured by Kyowa Interface Science Co., Ltd., and rubbed under the following measurement conditions. The coefficient of friction at the start of the movement is read as the static friction coefficient.

[0017] [Measurement conditions] Measurement load: 200g ·Measurement speed: 1000mm / min ·Measurement distance: 30mm Contact: R contact

[0018] The image to be measured for the static friction coefficient is formed by applying a pretreatment liquid to a fabric, then applying ink, and heating the fabric. Heating includes drying. The heating method is not particularly limited, and may be, for example, a contact type or a non-contact type.

[0019] It should be noted that Patent Document 3 mainly assumes that a treatment liquid is ejected onto ink prints, and in this respect, it also differs from the above-described image formation of the present invention. Patent Document 3 also calls for further verification regarding the use of fabric as a recording medium. The ink set of the present invention forms an image by ejecting ink after ejecting a pretreatment liquid onto fabric, and ejecting the pretreatment liquid onto the fabric can prevent ink bleeding and strike-through.

[0020] The present invention also has the advantage of providing good color development for images formed on fabric. While conventional techniques may be limited in the colors that can be used as pigment inks, the present invention allows for a wide range of colors to be selected for use as pigment inks. The ink used in the present invention also has the advantage of providing good ejection stability.

[0021] The ink set of the present invention can be used in an inkjet liquid ejection apparatus and a liquid ejection method, and may also be referred to as an inkjet ink set.

[0022] <Ink> The ink of the present invention is an ink used in a liquid ejection device that ejects ink onto fabric to which a pretreatment liquid has been applied, the ink comprising water, an organic solvent, a resin, and a pigment, and characterized in that the static friction coefficient of an image formed after the pretreatment liquid has been applied to the fabric and then the ink has been applied and heated is 0.47 or less, the resin is contained in the ink at 6% by mass or more, the ink contains silicone oil or contains wax in the ink at 0.5% by mass or more in terms of solid content, and the pretreatment liquid contains a coagulant in the pretreatment liquid at 35% by mass or less.

[0023] The ink of the present invention can form an image having excellent rub fastness even when a fabric is pretreated. Furthermore, the ink of the present invention has good liquid stability and ejection stability. The ink set of the present invention contains an ink having good liquid stability and ejection stability and a pretreatment liquid that can suppress ink bleeding and strike-through, and can form an image having excellent rub fastness even when a fabric is pretreated.

[0024] The ink of the present invention contains water, an organic solvent, a resin, and a pigment, and further contains silicone oil or wax. The ink may contain other materials as necessary. The ink set may contain one type of ink or multiple types of ink, for example, one color or multiple colors. When the ink contains wax or silicone oil, the static friction coefficient of the image is more likely to fall within the above range. From the viewpoint of preventing deterioration of liquid stability and ejection stability, it is preferable to use wax.

[0025] <<Silicone oil>> The silicone oil may be, for example, a dispersion of long-chain polydimethylsiloxane, etc. When silicone oil is contained, it is preferable that the content of the active ingredient is 0.1% by mass or more and 5.0% by mass or less relative to the total amount of ink.

[0026] <<Wax>> Although not limited thereto, the wax is preferably added to the ink in the form of a wax particle dispersion in which wax particles are dispersed in a liquid. When the ink contains wax, the wax oriented on the surface makes it easier to obtain stability as a liquid and ejection stability. As the wax, for example, wax particles, for example, either natural wax or synthetic wax can be used.

[0027] Examples of natural waxes include petroleum-based waxes, vegetable-based waxes, and animal and vegetable-based waxes. Examples of petroleum waxes include paraffin wax, microcrystalline wax, and petrolatum. Examples of vegetable waxes include carnauba wax, candelilla wax, rice wax, and Japan wax. Examples of animal and plant waxes include lanolin and beeswax.

[0028] Examples of synthetic waxes include polyethylene wax and Fischer-Tropsch wax.

[0029] Modified waxes may also be used, and examples of modified waxes include paraffin wax derivatives, montan wax derivatives, and microcrystalline wax derivatives.

[0030] These may be used alone or in combination of two or more. From the viewpoint of film-forming properties, slip properties, etc., it is particularly preferable to use polyethylene wax, paraffin wax, or carnauba wax.

[0031] The melting point of the wax, for example, wax particles, is preferably, for example, 50° C. or higher and 160° C. or lower. The melting point of the wax is preferably lower than the heating temperature used when forming the image for which the static friction coefficient is to be measured, and the difference between the melting point of the wax and the heating temperature is preferably 40° C. or lower. In this case, the added wax is more likely to be oriented on the surface, improving the stability as a liquid and the ejection stability.

[0032] When the ink contains wax, the wax content is 0.5% by mass or more in terms of solid content relative to the total amount of ink. By making the wax content 0.5% by mass or more, the desired coefficient of friction can be achieved. The wax content is preferably 5.0% by mass or less in terms of solid content relative to the total amount of ink, and more preferably 0.8% to 2.0% by mass in terms of solid content. Within this range, it is easy to control the friction coefficient to the desired value and maintain ejection stability. Furthermore, by setting the wax content within the above range, the friction resistance is further improved even within the desired friction coefficient.

[0033] The wax particle size is preferably, for example, a volume average particle size of 0.01 μm or more, more preferably 0.01 μm or more and 0.1 μm or less. By making the wax particle size 0.01 μm or more, the wax particles are more likely to be oriented on the surface of the pretreatment liquid, and the friction coefficient of the image is more likely to be reduced.

[0034] As the wax, commercially available products may be used, and examples of commercially available products include the High Tech series manufactured by Toho Chemical Industry Co., Ltd., the AQUACER series manufactured by BYK, and Cellosol 524 and Trasol CN manufactured by Chukyo Yushi Co., Ltd.

[0035] <<Organic solvents>> The organic solvent used in the present invention is not particularly limited, and may be, for example, a water-soluble organic solvent, such as polyhydric alcohols, ethers such as polyhydric alcohol alkyl ethers and polyhydric alcohol aryl ethers, nitrogen-containing heterocyclic compounds, amides, amines, or sulfur-containing compounds.

[0036] Specific examples of the water-soluble organic solvent include ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 3-methyl-1,3-butanediol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 2,4-pentanediol, 1,5-pentanediol, and the like. Polyhydric alcohols such as pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,3-hexanediol, 2,5-hexanediol, 1,5-hexanediol, glycerin, 1,2,6-hexanetriol, 2-ethyl-1,3-hexanediol, ethyl-1,2,4-butanetriol, 1,2,3-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, and petriol, ethylene glycol monoethyl ether, and ethylene glycol monobutyl ether. polyhydric alcohol alkyl ethers such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether; polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether; nitrogen-containing heterocyclic compounds such as 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1,3-dimethyl-2-imidazolidinone, ε-caprolactam, and γ-butyrolactone; amides such as formamide, N-methylformamide, N,N-dimethylformamide, 3-methoxy-N,N-dimethylpropionamide, and 3-butoxy-N,N-dimethylpropionamide; amines such as monoethanolamine, diethanolamine, and triethylamine; sulfur-containing compounds such as dimethyl sulfoxide, sulfolane, and thiodiethanol; propylene carbonate; and ethylene carbonate.

[0037] It is preferable to use an organic solvent having a boiling point of 250° C. or less, since it not only functions as a wetting agent but also provides good drying properties.

[0038] The content of the organic solvent in the ink is not particularly limited and can be selected appropriately depending on the purpose. From the viewpoint of the drying property and ejection reliability of the ink, however, the content is preferably 10% by mass or more and 60% by mass or less, and more preferably 20% by mass or more and 60% by mass or less.

[0039] <<Pigments>> As the pigment, inorganic pigments or organic pigments can be used. These may be used alone or in combination of two or more. Mixed crystals may also be used. Pigments are sometimes called coloring materials.

[0040] Examples of pigments that can be used include black pigments, yellow pigments, magenta pigments, cyan pigments, white pigments, green pigments, orange pigments, glossy pigments such as gold and silver pigments, and metallic pigments.

[0041] As inorganic pigments, titanium oxide, iron oxide, calcium carbonate, barium sulfate, aluminum hydroxide, barium yellow, cadmium red, chrome yellow, as well as carbon black produced by known methods such as the contact method, furnace method, and thermal method can be used.

[0042] In addition, examples of organic pigments that can be used include azo pigments, polycyclic pigments (e.g., phthalocyanine pigments, perylene pigments, perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, indigo pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments, etc.), dye chelates (e.g., basic dye chelates, acid dye chelates, etc.), nitro pigments, nitroso pigments, and aniline black. Of these pigments, those with good affinity with the solvent are preferably used. In addition, resin hollow particles and inorganic hollow particles can also be used.

[0043] Specific examples of pigments for black include carbon blacks (CI Pigment Black 7) such as furnace black, lamp black, acetylene black, and channel black, metals such as copper, iron (CI Pigment Black 11), and titanium oxide, and organic pigments such as aniline black (CI Pigment Black 1).

[0044] In addition, for color, CI Pigment Yellow 1, 3, 12, 13, 14, 17, 24, 34, 35, 37, 42 (yellow iron oxide), 53, 55, 74, 81, 83, 95, 97, 98, 100, 101, 104, 108, 109, 110, 117, 120, 138, 150, 153, 155, 180, 185, 213, CI Pigment Yellow Ranges 5, 13, 16, 17, 36, 43, 51, CI Pigment Red 1, 2, 3, 5, 17, 22, 23, 31, 38, 48:2, 48:2 (Permanent Red 2B (Ca)), 48:3, 48:4, 49:1, 52:2, 53:1, 57:1 (Brilliant Carmine 6B), 60:1, 63:1, 63:2, 64:1, 81, 83, 88 , 101 (Red Iron), 104, 105, 106, 108 (Cadmium Red), 112, 114, 122 (Quinacridone Magenta), 123, 146, 149, 166, 168, 170, 172, 177, 178, 179, 184, 185, 190, 193, 202, 207, 208, 209, 213, 219, 224, 254, 264, CI Pigment Violet 1 (Rhodamine Lake), 3, 5:1, 16, 19, 23, 38; CI Pigment Blue 1, 2, 15 (Phthalocyanine Blue), 15:1, 15:2, 15:3, 15:4 (Phthalocyanine Blue), 16, 17:1, 56, 60, 63; CI Pigment Green 1, 4, 7, 8, 10, 17, 18, 36, etc.

[0045] The content of the coloring material in the ink is preferably from 0.1% to 15% by mass, more preferably from 1% to 10% by mass, from the viewpoints of improving image density, good fixability, and ejection stability.

[0046] Methods for dispersing a pigment in ink include introducing a hydrophilic functional group into the pigment to make it a self-dispersing pigment, coating the surface of the pigment with a resin to disperse the pigment, and using a dispersant to disperse the pigment.

[0047] As a method for introducing a hydrophilic functional group into a pigment to make it a self-dispersing pigment, for example, a self-dispersing pigment can be obtained by adding a functional group such as a sulfone group or a carboxyl group to a pigment (e.g., carbon) to make it dispersible in water.

[0048] As a method for coating the surface of a pigment with a resin and dispersing it, a pigment can be encapsulated in microcapsules and made dispersible in water. This can also be called a resin-coated pigment. In this case, it is not necessary for all of the pigments blended into the ink to be coated with resin; uncoated or partially coated pigments may be dispersed in the ink, as long as the effects of the present invention are not impaired.

[0049] Examples of the method for dispersing using a dispersant include a method for dispersing using a known low molecular weight dispersant or a high molecular weight dispersant, such as a surfactant.

[0050] As the dispersant, for example, anionic surfactants, cationic surfactants, amphoteric surfactants, nonionic surfactants, etc. can be used depending on the pigment. RT-100 (nonionic surfactant) manufactured by Takemoto Yushi Co., Ltd. and sodium naphthalenesulfonate formalin condensate can also be suitably used as dispersants. The dispersants may be used alone or in combination of two or more.

[0051] <<Pigment dispersions>> Ink can be obtained by mixing a colorant with water, an organic solvent, or the like. Alternatively, ink can be produced by mixing a pigment with other ingredients such as water and a dispersant to form a pigment dispersion, and then mixing the pigment with other ingredients such as water and an organic solvent.

[0052] The pigment dispersion is obtained by dispersing water, a pigment, a pigment dispersant, and optionally other components, and adjusting the particle size. Dispersion is preferably performed using a disperser.

[0053] Although there are no particular restrictions on the particle size of the pigment in the pigment dispersion, the maximum frequency, calculated as the maximum number, is preferably 20 nm or more and 500 nm or less, and more preferably 20 nm or more and 150 nm or less, in order to improve the dispersion stability of the pigment and image quality such as ejection stability and image density. The particle size of the pigment can be measured using a particle size analyzer (Nanotrac Wave-UT151, manufactured by Microtrac Bell Co., Ltd.).

[0054] The content of the pigment in the pigment dispersion is not particularly limited and can be appropriately selected depending on the purpose. However, from the viewpoint of obtaining good ejection stability and increasing image density, the content is preferably 0.1% by mass or more and 50% by mass or less, and more preferably 0.1% by mass or more and 30% by mass or less. It is preferable that the pigment dispersion is degassed, if necessary, by filtering coarse particles using a filter, a centrifugal separator, or the like.

[0055] <<Resin>> The ink of the present invention contains a resin, which improves the abrasion resistance of the ink.

[0056] The resin may be added to the ink in any form, but the resin particles are contained in a dispersed state in the ink composition, and the resin particles generally bond together as water, which is the main solvent in aqueous inks, or the water-soluble organic solvent in the ink evaporates or penetrates, thereby facilitating the fixation of the pigment to the recording medium. Resins can be distinguished from the waxes by, for example, their melting points. For example, resins can be distinguished from waxes by the fact that they do not have a melting point between 50 and 160°C.

[0057] The type of resin contained in the ink is not particularly limited and can be selected appropriately depending on the purpose. Examples include urethane resin, polyester resin, acrylic resin, vinyl acetate resin, styrene resin, butadiene resin, styrene-butadiene resin, vinyl chloride resin, acrylic styrene resin, and acrylic silicone resin.

[0058] Resin particles made of these resins may also be used. The resin particles are dispersed in water as a dispersion medium to form a resin emulsion, which can be mixed with materials such as coloring materials and organic solvents to obtain an ink. The resin particles may be appropriately synthesized or commercially available. These may be used alone or in combination of two or more types of resin particles.

[0059] The volume average particle size of the resin particles is not particularly limited and can be appropriately selected depending on the purpose. However, from the viewpoint of obtaining good fixing properties and high image hardness, the volume average particle size is preferably 10 nm or more and 1,000 nm or less, more preferably 10 nm or more and 200 nm or less, and particularly preferably 10 nm or more and 100 nm or less.

[0060] The volume average particle size can be measured using, for example, a particle size analyzer (Nanotrac Wave-UT151, manufactured by Microtrac Bell Co., Ltd.).

[0061] The resin content in the ink is 6% by mass or more. In this case, it becomes easier to adjust the coefficient of friction within the desired range. Furthermore, from the viewpoint of fixability and ink storage stability, the resin content is preferably 30% by mass or less, more preferably 20% by mass or less. Furthermore, 10% by mass or more is preferable.

[0062] <<Additives>> If necessary, surfactants, antifoaming agents, antiseptic and antifungal agents, antirust agents, pH adjusters, etc. may be added to the ink.

[0063] <<Surfactants>> As the surfactant, any of silicone surfactants, fluorine surfactants, amphoteric surfactants, nonionic surfactants and anionic surfactants can be used.

[0064] Silicone surfactants are not particularly limited and can be appropriately selected depending on the purpose.Among them, those that do not decompose even at high pH are preferred, such as side-chain modified polydimethylsiloxane, both-end modified polydimethylsiloxane, one-end modified polydimethylsiloxane, and both-end modified polydimethylsiloxane of side chain, and those having a polyoxyethylene group or a polyoxyethylene polyoxypropylene group as a modifying group are particularly preferred because they exhibit good properties as aqueous surfactants.In addition, polyether-modified silicone surfactants can also be used as the silicone surfactant, and examples thereof include compounds in which a polyalkylene oxide structure is introduced into the Si part side chain of dimethylsiloxane.

[0065] As fluorosurfactants, for example, perfluoroalkyl sulfonic acid compounds, perfluoroalkyl carboxylic acid compounds, perfluoroalkyl phosphate ester compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in the side chain are particularly preferred due to their low foaming properties. Examples of the perfluoroalkyl sulfonic acid compounds include perfluoroalkyl sulfonic acids and perfluoroalkyl sulfonate salts. Examples of the perfluoroalkyl carboxylic acid compounds include perfluoroalkyl carboxylic acids and perfluoroalkyl carboxylate salts. Examples of the polyoxyalkylene ether polymer compounds having perfluoroalkyl ether groups in the side chain include sulfate ester salts of polyoxyalkylene ether polymers having perfluoroalkyl ether groups in the side chain, and salts of polyoxyalkylene ether polymers having perfluoroalkyl ether groups in the side chain. Counterions of the salts in these fluorosurfactants include Li, Na, K, NH, NHCHCHOH, NH(CHCHOH), NH(CHCHOH), and the like.

[0066] Examples of amphoteric surfactants include lauryl aminopropionate, lauryl dimethyl betaine, stearyl dimethyl betaine, and lauryl dihydroxyethyl betaine.

[0067] Examples of nonionic surfactants include polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkylamines, polyoxyethylene alkylamides, polyoxyethylene propylene block polymers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and ethylene oxide adducts of acetylene alcohol.

[0068] Examples of anionic surfactants include polyoxyethylene alkyl ether acetates, dodecylbenzenesulfonates, laurates, and salts of polyoxyethylene alkyl ether sulfates. These may be used alone or in combination of two or more.

[0069] The content of the surfactant in the ink is not particularly limited and can be selected appropriately depending on the purpose. However, from the viewpoint of providing excellent wettability and ejection stability and improving image quality, the content is preferably from 0.001% by mass to 5% by mass, and more preferably from 0.05% by mass to 5% by mass.

[0070] <<Antifoaming agent>> The antifoaming agent is not particularly limited, and examples thereof include silicone-based antifoaming agents, polyether-based antifoaming agents, and fatty acid ester-based antifoaming agents. These may be used alone or in combination of two or more. Among these, silicone-based antifoaming agents are preferred because of their excellent foam-breaking effect.

[0071] <<Preservative and fungicide>> The antiseptic and antifungal agent is not particularly limited, and examples thereof include 1,2-benzisothiazolin-3-one.

[0072] <<Rust inhibitor>> There are no particular restrictions on the rust inhibitor, and examples thereof include acid sulfite and sodium thiosulfate.

[0073] <<pH adjuster>> There are no particular restrictions on the pH adjuster as long as it can adjust the pH to 7 or higher, and examples thereof include amines such as diethanolamine and triethanolamine.

[0074] <Pretreatment liquid> Next, the pretreatment liquid of the present invention will be described. The pretreatment liquid of the present invention is a pretreatment liquid used in a liquid ejection device that ejects ink onto a fabric to which the pretreatment liquid is applied. The ink contains water, an organic solvent, a resin, and a pigment. After applying the pretreatment liquid to the fabric and then applying the ink and heating, the coefficient of static friction of the image is 0.47 or less. The resin is contained in the ink at 6% by mass or more. The ink contains silicone oil or contains wax in the ink at a solid content of 0.5% by mass or more. The pretreatment liquid is characterized by containing a flocculant in the pretreatment liquid at 35% by mass or less.

[0075] The pretreatment liquid of the present invention can form an image having excellent friction fastness even when pretreatment is performed on the fabric. Further, the pretreatment liquid of the present invention can suppress bleeding and strike-through of the ink. The ink set of the present invention has an ink with good liquid stability and ejection stability, and a pretreatment liquid that can suppress bleeding and strike-through of the ink, and can form an image having excellent friction fastness even when pretreatment is performed on the fabric.

[0076] The pretreatment liquid contains, for example, a flocculant, an organic solvent, and water, and may contain a surfactant, an antifoaming agent, a pH adjuster, an antiseptic and antifungal agent, a rust inhibitor, etc. as necessary. The organic solvent, surfactant, antifoaming agent, pH adjuster, antiseptic and antifungal agent, and rust inhibitor can use the same materials as those used for the ink, and in addition, materials used for known treatment liquids can be used. Here, the flocculant will be mainly described, and the description of the same materials as those of the ink will be omitted.

[0077] <<Flocculant>> The type of the aggregating agent is not particularly limited, but is preferably an organic acid or a polyvalent metal salt, which is preferred from the viewpoint of more efficiently aggregating the pigment and suppressing image bleeding.

[0078] The organic acid used in the pretreatment liquid is not particularly limited, but preferably contains a carboxylic acid having a carbon number of 6 or less. Carboxylic acids having a carbon number of 6 or less are highly soluble in water, preventing separation of the carboxylic acid from water during long-term storage and enhancing the stability of the pretreatment liquid.

[0079] Preferred examples of carboxylic acids having 6 or less carbon atoms include saturated fatty acids such as formic acid, acetic acid, propionic acid, butyric acid, valeric acid, and hexanoic acid, and hydroxy acids such as lactic acid, malic acid, and citric acid. The carbon chain may be linear or branched, and may be saturated or unsaturated. Among these, lactic acid and citric acid are preferred. In this case, the abrasion resistance and color development are improved.

[0080] The polyvalent metal salt used in the pretreatment liquid can be used without any particular limitation, and examples thereof include magnesium sulfate, aluminum sulfate, manganese sulfate, nickel sulfate, iron(II) sulfate, copper(II) sulfate, zinc sulfate, calcium nitrate, iron(II) nitrate, iron(III) nitrate, cobalt nitrate, strontium nitrate, copper(II) nitrate, nickel(II) nitrate, lead(II) nitrate, manganese(II) nitrate, nickel(II) chloride, calcium chloride, tin(II) chloride, etc. Divalent metal salts are particularly preferred from the viewpoint of maintaining ink aggregation at a moderate level.

[0081] Other examples of the flocculant that may be used include cationic polymers, such as allylamine hydrochloride polymers.

[0082] The content of the flocculant in the pretreatment liquid is 35% by mass or less. In this case, it is easier to adjust the coefficient of friction within the desired range. The content of the flocculant in the pretreatment liquid is preferably 1% by mass or more, more preferably 2% by mass or more, based on the total amount of the pretreatment liquid. A content of 1% by mass or more causes aggregation of the pigment, making it possible to suppress image bleeding. The content is preferably 30% by mass or less, more preferably 15% by mass or less, based on the total amount of the pretreatment liquid. By keeping the content of the flocculant at the above value or less, the effect of leaving the pigment on the fabric surface is not too high, making it easier to maintain friction fastness.

[0083] (Recorded material) In the present invention, a recorded matter having an image formed on a fabric using the ink set of the present invention is obtained. The recorded matter may also be called a printed matter, an inkjet recorded matter, or the like. A pretreatment liquid and an ink are discharged using a liquid discharge device and a liquid discharge method to obtain a recorded matter. The recorded matter obtained by the present invention has good abrasion fastness.

[0084] (fabric) Examples of the fabric used in the present invention include woven fabrics and knitted fabrics. Examples of fibers that form the fabric include natural fibers such as cotton, rayon, linen, silk, and wool, semi-synthetic fibers such as acetate and triacetate, and synthetic fibers such as polyester, polyamide, and acrylic.

[0085] (Liquid discharge device, liquid discharge method) Next, the liquid ejection device and liquid ejection method of the present invention will be described. The liquid ejection device can be used as a recording device, a printing device, an image forming device, an inkjet recording device, etc., and the liquid ejection method can be used as a recording method, a printing method, an image forming method, an inkjet recording method, etc.

[0086] The liquid ejection device of the present invention is a liquid ejection device having the ink set for fabrics of the present invention. One embodiment of the liquid ejection device of the present invention comprises a means for applying a pretreatment liquid contained in the ink set for fabrics to fabrics, and a means for ejecting the ink contained in the ink set for fabrics onto the fabrics. The liquid ejection method of the present invention is a liquid ejection method using the ink set for fabrics of the present invention. One embodiment of the liquid ejection method of the present invention includes the steps of applying a pretreatment liquid contained in the ink set for fabrics to fabric, and ejecting the ink contained in the ink set for fabrics onto the fabric.

[0087] The means for applying the pretreatment liquid to the fabric and the step for applying the pretreatment liquid to the fabric are not particularly limited and can be appropriately selected depending on the purpose. Examples include an inkjet head, a sprayer, a hand sprayer, an application roller, a brush, etc. Among these, ejection by an inkjet head is preferred.

[0088] One embodiment of the liquid ejection device of the present invention is a liquid ejection device having the ink set of the present invention, and is equipped with a first ejection means that ejects the pretreatment liquid onto a fabric, and a second ejection means that ejects the ink onto the fabric onto which the pretreatment liquid has been ejected.

[0089] One embodiment of the liquid ejection method of the present invention is a liquid ejection method using the ink set of the present invention, which includes a first ejection step of ejecting the pretreatment liquid onto a fabric, and a second ejection step of ejecting the ink onto the fabric onto which the pretreatment liquid has been ejected.

[0090] According to the liquid ejection device and liquid ejection method of the present invention, an image having excellent abrasion resistance can be formed even when the fabric has been subjected to a pretreatment.

[0091] The liquid ejection device of the present invention may also include a heating means for heating the fabric onto which the ink has been ejected. When the ink contains wax and the liquid ejection device includes a heating means, the heating temperature of the heating means is preferably higher than the melting point of the wax, and the difference between the heating temperature of the heating means and the melting point of the wax is preferably 40°C or less.

[0092] Furthermore, the liquid ejection method of the present invention may include a heating step of heating the fabric onto which the ink has been ejected. When the ink contains wax and the liquid ejection method includes a heating step, the heating temperature in the heating step is higher than the melting point of the wax, and the difference between the heating temperature in the heating step and the melting point of the wax is preferably 40°C or less.

[0093] In this way, by setting the heating temperature higher than the melting point of the wax and keeping the difference between the heating temperature and the melting point of the wax at 40°C or less, the wax is oriented on the surface of the ink layer on the fabric, making it easier to obtain a desired static friction coefficient, which also improves the abrasion resistance.

[0094] As long as the static friction coefficient of the image after heating is 0.47 or less, a step of heating (drying) or applying a post-treatment liquid may be inserted between the application of the pretreatment liquid and the application of the ink, or between the application of the ink and heating (drying). The static friction coefficient of the image after heating of 0.47 or less specified in the ink set of the present invention specifies the static friction coefficient of the image after applying the pretreatment liquid to the fabric, then applying the ink, and then heating. In the liquid ejection apparatus and liquid ejection method of the present invention, as long as the ink set of the present invention is used, a step of heating (drying) or applying a post-treatment liquid may be inserted between the application of the pretreatment liquid and the application of the ink, or between the application of the ink and heating (drying).

[0095] The liquid ejection apparatus and the liquid ejection method will be further described below by taking a recording apparatus and a recording method as examples. In the following description, heating and drying are distinguished, but in this specification, the heating process includes the drying process.

[0096] The ink set of the present invention can be suitably used in various recording devices using the ink jet recording method, such as printers, facsimile machines, copying machines, printer / fax / copier combination machines, and three-dimensional modeling devices.

[0097] In the present invention, the term "recording apparatus" and "recording method" refer to an apparatus capable of ejecting ink or various treatment liquids onto a recording medium, and a method of recording using the apparatus. The term "recording medium" refers to an object onto which ink or various treatment liquids can be attached, even if only temporarily.

[0098] This recording device can include not only the head portion that ejects ink, but also means related to feeding, transporting, and discharging the recording medium, as well as other devices called pre-processing devices and post-processing devices.

[0099] The recording apparatus and recording method may have a heating means used in the heating step and a drying means used in the drying step. The heating means and drying means include, for example, means for heating and drying the printed surface and back surface of the recording medium. The heating means and drying means are not particularly limited, but for example, a hot air heater or an infrared heater can be used. Heating and drying can be carried out before, during, or after printing.

[0100] Furthermore, the recording device and recording method are not limited to those that visualize meaningful images such as letters and figures using ink. For example, they also include those that form patterns such as geometric designs and those that create three-dimensional images.

[0101] Furthermore, unless otherwise specified, the recording apparatus includes both a serial type apparatus in which the ejection head moves and a line type apparatus in which the ejection head does not move.

[0102] Furthermore, this recording device includes not only desktop types, but also wide-width recording devices that can print on A0-sized recording media, and continuous feed printers that can use continuous paper wound into a roll as a recording medium, for example.

[0103] An example of a recording apparatus will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of the apparatus. FIG. 2 is a perspective view of a main tank. An image forming apparatus 400, as an example of a recording apparatus, is a serial-type image forming apparatus. A mechanism unit 420 is provided within an exterior 401 of the image forming apparatus 400. For example, ink storage sections 411 of main tanks 410 (410k, 410c, 410m, 410y) for each color, such as black (K), cyan (C), magenta (M), and yellow (Y), are formed from a packaging material such as aluminum laminate film. The ink storage sections 411 are housed in a storage container case 414 made of, for example, plastic. As a result, the main tanks 410 are used as ink cartridges for each color. Note that the color inks are not limited to black (K), cyan (C), magenta (M), and yellow (Y), and may be other colors such as white or metallic ink. The same applies to the main tanks 410 of each color and the ink storage portions 411.

[0104] On the other hand, a cartridge holder 404 is provided at the back of the opening when the cover 401c of the device body is opened. A main tank 410 is detachably attached to the cartridge holder 404. This allows each ink outlet 413 of the main tank 410 to communicate with the ejection head 434 for each color via the supply tube 436 for each color, making it possible to eject ink from the ejection head 434 onto a recording medium.

[0105] The pretreatment liquid may be ejected from the ejection head 434 or from another ejection head. The pretreatment liquid is filled in an appropriate tank or ink storage section.

[0106] In the present invention, the terms image formation, recording, printing, printing, etc. are all synonymous. Recording medium, media, and printed material are all synonymous. [Example]

[0107] The present invention will be explained in more detail below by showing examples, but the present invention is not limited to these examples.

[0108] (Preparation of ink and pretreatment liquid) <Preparation of Black Pigment Dispersion A> -Preparation of polymer solution A- A 1-L flask equipped with a mechanical stirrer, a thermometer, a nitrogen gas inlet tube, a reflux condenser, and a dropping funnel was thoroughly purged with nitrogen gas, and then 11.2 g of styrene, 2.8 g of acrylic acid, 12.0 g of lauryl methacrylate, 4.0 g of polyethylene glycol methacrylate, 4.0 g of styrene macromer, and 0.4 g of mercaptoethanol were mixed and heated to 65°C. Next, a mixed solution of 100.8 g of styrene, 25.2 g of acrylic acid, 108.0 g of lauryl methacrylate, 36.0 g of polyethylene glycol methacrylate, 60.0 g of hydroxylethyl methacrylate, 36.0 g of styrene macromer, 3.6 g of mercaptoethanol, 2.4 g of azobismethylvaleronitrile, and 18 g of methyl ethyl ketone was added dropwise to the flask over 2.5 hours. After the dropwise addition, a mixed solution of 0.8 g of azobismethylvaleronitrile and 18 g of methyl ethyl ketone was added dropwise to the flask over 0.5 hours. After aging at 65°C for 1 hour, 0.8 g of azobismethylvaleronitrile was added, and the mixture was aged for another 1 hour. After the reaction was completed, 364 g of methyl ethyl ketone was added to the flask, yielding 800 g of polymer solution A with a concentration of 50% by mass.

[0109] -Preparation of pigment-containing polymer particle dispersion- 28 g of polymer solution A, 42 g of carbon black pigment (trade name: Monarch 800, manufactured by Cabot Corporation), 13.6 g of 1 mol / L aqueous potassium hydroxide solution, 20 g of methyl ethyl ketone, and 13.6 g of ion-exchanged water were thoroughly stirred and then kneaded using a roll mill. The obtained paste was added to 200 g of pure water and thoroughly stirred, and then the methyl ethyl ketone and water were distilled off using an evaporator. Furthermore, in order to remove coarse particles, this dispersion was filtered under pressure using a polyvinylidene fluoride membrane filter with an average pore size of 5.0 μm, to obtain a resin-coated black pigment dispersion A having a pigment concentration of 15% by mass and a solids concentration of 20% by mass.

[0110] <Preparation of Black Pigment Dispersion B> 100 g of carbon black: Seast SP (SRF-LS) manufactured by Tokai Carbon Co., Ltd. was added to 3000 mL of 2.5 N (normal) sodium hypochlorite solution, and the mixture was stirred at a temperature of 60°C and a speed of 300 rpm for 10 hours to carry out an oxidation treatment, resulting in a pigment with carboxylic acid groups attached to the surface of the carbon black. This reaction solution was filtered, and the separated carbon black was neutralized with a sodium hydroxide solution and subjected to ultrafiltration. Next, the pigment dispersion and ion-exchanged water were subjected to ultrafiltration using a dialysis membrane, and then ultrasonic dispersion was carried out to concentrate the pigment solid content to 20%, thereby obtaining a self-dispersing black pigment dispersion B.

[0111] <Preparation of ink and pretreatment liquid> The materials were mixed and stirred according to the formulations and blending amounts (mass %) shown in Tables 1 and 2 below, and filtered through a 0.8 μm cellulose acetate filter (Minisart, manufactured by Sartorius) to obtain inks 1 to 9 and pretreatment solutions 1 to 8. For resin emulsions and pigments, the amounts added are listed as solid contents.

[0112] The details of the materials used and listed in Tables 1 and 2 are shown below. Surfynol 440 (acetylene glycol surfactant manufactured by Nissin Chemical Co., Ltd.) Silface SAG-014 (a silicone surfactant manufactured by Nissin Chemical Co., Ltd.) AQUACER 2500 (polyethylene wax manufactured by BYK: melting point 125°C) AQUACER 513 (BYK polyethylene wax: melting point 135°C) AQUACER 593 (BYK polypropylene wax: melting point 160°C) CA-179 (Chukyou Yushi polyethylene wax: melting point 110°C) TEGO GLIDE 450 (long-chain silicone oil manufactured by Evonik) LUBRIJET T340 (Lubrizol acrylic resin emulsion) Permarin UA-368 (urethane resin emulsion manufactured by Sanyo Chemical Industries, Ltd.) Eliter KT-0507 (Unitika polyester resin emulsion) Hydran CP-7610 (DIC cationic urethane resin emulsion) PAA-HCL-01 (Allylamine hydrochloride polymer manufactured by Nittobo Medical Co., Ltd.) Proxel LV (preservative manufactured by Arcsada)

[0113] [Table 1]

[0114] [Table 2]

[0115] (Examples 1 to 11, Comparative Examples 1 to 3) For Examples 1 to 11 and Comparative Examples 1 to 3, printing was carried out on the printing substrates shown in Tables 3 and 4 using the combinations of ink and pretreatment liquid shown in the tables, and the properties were evaluated as follows.

[0116] The printing substrates (fabrics) listed in Tables 3 and 4 are as follows. Cotton broadcloth: Irozome Co., Ltd. cotton broadcloth 40 with silk Polytro: Polyester tropical manufactured by Irozome Co., Ltd. (Teijin) Blended brocade: T / C broadcloth made by Irozome Co., Ltd.

[0117] <How to create printed materials> The ink and pretreatment liquid of the examples and comparative examples were filled in separate devices (RICOH Ri100 manufactured by Ricoh Co., Ltd.), and the deposition amount of both the pretreatment liquid and the ink was 20 g / m 2Next, the pretreatment liquid was ejected onto the printing substrate shown in the table, and then the ink was ejected to perform solid printing at 600 × 600 dpi, and then the resultant was dried for 10 minutes in an oven set at the drying temperature shown in the table to produce a printed matter.

[0118] <Measurement of static friction coefficient> The solid image prepared by the above method was cut into a length of approximately 15 cm and set in an automatic friction and wear analyzer TSf-503 manufactured by Kyowa Interface Science Co., Ltd., and rubbed under the following measurement conditions, and the friction coefficient at the start of movement was read as the static friction coefficient.

[0119] [Measurement conditions] Measurement load: 200g ·Measurement speed: 1000mm / min ·Measurement distance: 30mm Contact: R contact

[0120] <Dry rubbing fastness evaluation> The solid image created by the above method was subjected to a rub fastness test (dry rub) using a Gakushin-type rub fastness tester in accordance with Japanese Industrial Standards (JIS) L0849, and the color OD transferred to cotton fabric was measured and evaluated based on the following criteria. Grades up to B are acceptable.

[0121] [Evaluation criteria] A: The transfer OD of the cotton fabric after the test is less than 0.10 B: The transfer OD of the cotton fabric after the test is 0.10 or more and less than 0.15 C: Transfer OD of cotton fabric after test is 0.15 or more

[0122] <Color development evaluation> The image density of the solid image produced by the above method was measured and evaluated using an X-rite Exact manufactured by X-rite Co., Ltd. A rating of up to B is within the acceptable range.

[0123] [Evaluation criteria] A: Solid area density is 0.14 or more B: Solid area density is 0.13 or more and less than 0.14 C: Solid area density is less than 0.13

[0124] <Evaluation of ejection stability> The prepared ink was filled into a Ricoh IPSiO GXe5500. A chart with dots arranged every other nozzle was printed on plain paper (product name: My Paper, Ricoh), and the landing positions of the droplets were observed under a microscope and evaluated according to the following criteria. Grades up to B are practical levels.

[0125] [Evaluation criteria] A: No missing dots or bends are observed. B: Slightly misaligned dots due to deflected ejection were observed. C: Missing due to non-ejection is observed, or many bends are confirmed.

[0126] [Table 3]

[0127] [Table 4]

[0128] From the above results, it is clear that the present invention can form an image having excellent abrasion resistance even when the fabric is subjected to a pretreatment.

[0129] For example, aspects of the present invention are as follows. <1> An ink set for fabrics comprising a pretreatment liquid and an ink, the ink contains water, an organic solvent, a resin, and a pigment; the static friction coefficient of the image formed after the pretreatment liquid is applied to a fabric and then the ink is applied and heated is 0.47 or less; the resin is contained in the ink at a content of 6% by mass or more, the ink contains silicone oil or wax in an amount of 0.5% by mass or more in terms of solid content; The pretreatment liquid contains a flocculant in an amount of 35% by mass or less. An ink set characterized by: <2> the ink contains a wax; The melting point of the wax is lower than the heating temperature, and the difference between the melting point of the wax and the heating temperature is 40°C or less. Characterized by <1> The ink set according to claim 1. <3> the ink contains a wax; The content of the wax is 0.8% by mass or more and 2.0% by mass or less in terms of solid content with respect to the total amount of the ink. Characterized by <1> or <2> The ink set according to claim 1. <4> The flocculant is a polyvalent metal salt or an organic acid. Characterized by <1> from <3> 1. The ink set according to claim 1 , <5> <1> from <4> A liquid ejection device having the ink set according to any one of a first discharge means for discharging the pretreatment liquid onto a fabric; a second ejection means for ejecting the ink onto the fabric onto which the pretreatment liquid has been ejected. A liquid ejection device characterized by: <6> a heating means for heating the fabric onto which the ink has been ejected, the ink contains a wax; The heating temperature of the heating means is higher than the melting point of the wax, and the difference between the heating temperature of the heating means and the melting point of the wax is 40°C or less. Characterized by <5> The liquid ejection device according to claim 1. <7> <1> from <4> A liquid ejection method using the ink set according to any one of the preceding claims, a first discharging step of discharging the pretreatment liquid onto a fabric; a second ejection step of ejecting the ink onto the fabric onto which the pretreatment liquid has been ejected. A liquid ejection method comprising: <8> a heating step of heating the fabric onto which the ink has been ejected, the ink contains a wax; The heating temperature in the heating step is higher than the melting point of the wax, and the difference between the heating temperature in the heating step and the melting point of the wax is 40° C. or less. Characterized by <7> The liquid ejection method according to claim 1. <9> An ink used in a liquid ejection device that ejects ink onto fabric to which a pretreatment liquid has been applied, the ink contains water, an organic solvent, a resin, and a pigment; the static friction coefficient of the image formed after the pretreatment liquid is applied to a fabric and then the ink is applied and heated is 0.47 or less; the resin is contained in the ink at a content of 6% by mass or more, the ink contains silicone oil or wax in an amount of 0.5% by mass or more in terms of solid content; The pretreatment liquid contains a flocculant in an amount of 35% by mass or less. An ink characterized by: <10> A pretreatment liquid used in a liquid ejection device that ejects ink onto fabric to which the pretreatment liquid has been applied, the ink contains water, an organic solvent, a resin, and a pigment; the static friction coefficient of the image formed after the pretreatment liquid is applied to a fabric and then the ink is applied and heated is 0.47 or less; the resin is contained in the ink at a content of 6% by mass or more, the ink contains silicone oil or wax in an amount of 0.5% by mass or more in terms of solid content; The pretreatment liquid contains a flocculant in an amount of 35% by mass or less. A pretreatment solution characterized by: [Explanation of symbols]

[0130] 400 Image forming device 401 Exterior of image forming device 401c Device body cover 404 Cartridge Holder 410 Main Tank 410k, 410c, 410m, 410y Main tanks for black (K), cyan (C), magenta (M), and yellow (Y) 411 Ink storage unit 413 Ink outlet 414 Storage container case 420 Mechanism Department 434 Discharge Head 436 Supply Tube [Prior art documents] [Patent documents]

[0131] [Patent Document 1] Japanese Patent Application Publication No. 2019-206628 [Patent Document 2] Japanese Patent Application Publication No. 2022-85549 [Patent Document 3] Patent No. 6596854

Claims

1. An ink set for fabrics comprising a pretreatment liquid and an ink, the ink contains water, an organic solvent, a resin, and a pigment; the static friction coefficient of an image formed after applying the pretreatment liquid to a fabric and then applying the ink and heating the fabric is 0.47 or less; the resin is contained in the ink at a content of 6% by mass or more, the ink contains silicone oil or wax in an amount of 0.5% by mass or more in terms of solid content; The pretreatment liquid contains a flocculant in an amount of 35% by mass or less. An ink set characterized by:

2. the ink contains a wax; The melting point of the wax is lower than the heating temperature, and the difference between the melting point of the wax and the heating temperature is 40° C. or less. The ink set according to claim 1 .

3. the ink contains a wax; The content of the wax is 0.8% by mass or more and 2.0% by mass or less in terms of solid content with respect to the total amount of the ink. The ink set according to claim 1 .

4. The flocculant is a polyvalent metal salt or an organic acid. The ink set according to claim 1 .

5. A liquid ejection device having the ink set according to any one of claims 1 to 4, a first discharge means for discharging the pretreatment liquid onto a fabric; a second ejection means for ejecting the ink onto the fabric onto which the pretreatment liquid has been ejected. A liquid ejection device characterized by:

6. a heating means for heating the fabric onto which the ink has been ejected, the ink contains a wax; The heating temperature of the heating means is higher than the melting point of the wax, and the difference between the heating temperature of the heating means and the melting point of the wax is 40° C. or less.

6. The liquid ejection device according to claim 5.

7. A liquid ejection method using the ink set according to any one of claims 1 to 4, a first discharging step of discharging the pretreatment liquid onto a fabric; a second ejection step of ejecting the ink onto the fabric onto which the pretreatment liquid has been ejected. A liquid ejection method comprising:

8. a heating step of heating the fabric onto which the ink has been ejected, the ink contains a wax; The heating temperature in the heating step is higher than the melting point of the wax, and the difference between the heating temperature in the heating step and the melting point of the wax is 40° C. or less.

8. The liquid ejection method according to claim 7.

9. An ink used in a liquid ejection device that ejects ink onto fabric to which a pretreatment liquid has been applied, the ink contains water, an organic solvent, a resin, and a pigment; the static friction coefficient of an image formed after applying the pretreatment liquid to a fabric and then applying the ink and heating the fabric is 0.47 or less; the resin is contained in the ink at a content of 6% by mass or more, the ink contains silicone oil or wax in an amount of 0.5% by mass or more in terms of solid content; The pretreatment liquid contains a flocculant in an amount of 35% by mass or less. An ink characterized by:

10. A pretreatment liquid used in a liquid ejection device that ejects ink onto fabric to which the pretreatment liquid has been applied, the ink contains water, an organic solvent, a resin, and a pigment; the static friction coefficient of an image formed after applying the pretreatment liquid to a fabric and then applying the ink and heating the fabric is 0.47 or less; the resin is contained in the ink at a content of 6% by mass or more, the ink contains silicone oil or wax in an amount of 0.5% by mass or more in terms of solid content; The pretreatment liquid contains a flocculant in an amount of 35% by mass or less. A pretreatment solution characterized by:

Images