Inkjet treatment liquid and inkjet printing device

Abstract

To provide an inkjet treatment liquid that is applied prior to ink application, and an inkjet printing device using the inkjet treatment liquid.SOLUTION: The present invention relates to an inkjet treatment liquid containing a water-soluble cationic polymer and an organic acid salt, wherein the content of the water-soluble cationic polymer is 0.1 wt.% or more and less than 10 wt.% with respect to the total amount of the treatment liquid.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an inkjet treatment liquid, and further to an inkjet textile printing apparatus using the same. [Background technology]

[0002] In the inkjet recording method, it is known to apply a pretreatment liquid prior to application of ink. For example, a method has been reported in which a treatment liquid containing an aggregating agent is used as a component that forms an aggregate together with the coloring material in the ink.

[0003] Patent Document 1 discloses an image forming method including a pretreatment liquid application step of applying a pretreatment liquid to a surface of a recording medium having a coating layer on at least one surface of a support, the surface having the coating layer, and an image forming step of ejecting an aqueous ink by an inkjet method onto the recording medium after the application of the pretreatment liquid to form an image, the pretreatment liquid containing at least a water-soluble cationic polymer, an organic acid ammonium salt, and water, the content of the water-soluble cationic polymer in the pretreatment liquid being 10 to 70% by mass, and the content of the organic acid ammonium salt being 1 to 40% by mass.

[0004] Furthermore, Patent Document 2 discloses an inkjet recording method including a treatment liquid application step of applying a treatment liquid containing a flocculant to a recording medium, and an ink application step of applying an aqueous ink composition to the recording medium, wherein the treatment liquid contains one or more of a metal salt, a cationic polymer, and an organic acid as the flocculant. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-15008 A [Patent Document 2] JP 2020-104486 A Summary of the Invention

[0006] A treatment liquid for inkjet according to one aspect of the present disclosure contains a water-soluble cationic polymer and an organic acid salt, and the content of the water-soluble cationic polymer is 0.1% by weight or more and less than 10% by weight based on the total weight of the treatment liquid. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram showing an embodiment of an ink-jet textile printing apparatus that uses the ink-jet treatment liquid of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The invention described in Patent Document 1 as mentioned above is an image forming method in which a pretreatment liquid for agglomerating ink pigments is applied (coated) to a recording medium, which is then dried, and then an aqueous ink is ejected by an inkjet method to form an image, and the concentration of cationic polymer in the treatment liquid is very high (10 mass % or more).Since a treatment liquid containing such a high concentration of cationic polymer cannot be ejected from a treatment head, a step of applying the treatment liquid before ejecting the ink is required, which is cumbersome.

[0009] Furthermore, when the treatment liquid described in the above-mentioned Patent Document 2 is used, there is a risk that sufficient ink coagulation properties may not be obtained.

[0010] Moreover, the techniques described in Patent Documents 1 and 2 above are both inkjet image forming methods for mainly printing on paper media such as plain paper and low liquid absorbency recording media such as film sheets. Therefore, the purpose is to form good images with suppressed bleeding, and it is not expected that they will be used for textile printing on cloth, etc. In the case of inkjet recording used for textile printing, there is a demand for improved friction fastness and washing fastness, as well as suppressing stiffness of the fabric to be printed and improving the texture, such as the feel to the touch.

[0011] Hereinafter, embodiments of the present disclosure will be described in detail, but the present disclosure is not limited to these.

[0012] [Inkjet treatment liquid] An inkjet treatment liquid according to one embodiment of the present disclosure (hereinafter, sometimes simply referred to as the "treatment liquid") contains a water-soluble cationic polymer and an organic acid salt, and the content of the water-soluble cationic polymer is 0.1% by weight or more and less than 10% by weight with respect to the entire treatment liquid.

[0013] The treatment liquid of this embodiment is a pretreatment liquid that is applied to the recording target prior to the ink. The water-soluble cationic polymer and organic acid salt contained in this treatment liquid react and coagulate with the pigment contained in the ink that is applied thereafter, thereby ensuring excellent color development.

[0014] Since the content of the water-soluble cationic polymer is 0.1% by weight or more and less than 10% by weight with respect to the entire treatment liquid, the treatment liquid of this embodiment can be ejected from an inkjet head member, and therefore it is possible to omit a coating step by a roll coating method, a blade coating method, etc. In other words, since the treatment liquid of this embodiment can be ejected from an inkjet member in the same way as ink, it can be easily attached to a recording target.

[0015] In addition, when the treatment liquid of this embodiment is used for textile printing, in addition to the above, there is an advantage that the wet friction resistance and washing fastness can be improved, and the texture of the fabric is also improved. In particular, by containing the water-soluble cationic polymer in the above range, the fabric becomes strong against wet friction. If the content of the water-soluble cationic polymer is 10% by weight or more, sufficient wet friction fastness cannot be obtained.

[0016] That is, the inkjet treatment liquid of the present disclosure can be ejected from an inkjet head member in inkjet recording, and excellent color development can be obtained. Furthermore, when the inkjet treatment liquid of the present disclosure is used for textile printing, it has the excellent advantages of improving wet friction properties and washing fastness, and improving the texture of the fabric.

[0017] The water-soluble cationic polymer contained in the inkjet treatment liquid of the present embodiment is not particularly limited as long as it is a water-soluble, positively charged cationic polymer, and examples thereof include cationic polymers such as ammonium-containing polymers, amine-containing polymers, polyallylamine, polyvinylamine, polyimine, polyvinylpyrrolidone, polyethyleneimine, polyvinylpyridine, aminoacetalized polyvinyl alcohol, ionene polymers, polyvinylimidazole, polyvinylbenzylphosphonium, polyalkylallylammonium, polyamidine, and polyamine sulfone. Among these, from the viewpoint of obtaining better color development, particularly preferred examples include quaternary ammonium-containing polymers, diallyldimethylammonium sulfur dioxide copolymers, diallyldimethylammonium chloride acrylamide copolymers, diallyldimethylammonium chloride polymers, dimethylamine-ammonia-epichlorohydrin polycondensates, and dimethylamine-ammonia-epichlorohydrin polycondensates. These may be used alone or in combination of two or more.

[0018] The weight average molecular weight of the cationic polymer used in the present embodiment is not particularly limited, but is preferably about 1000 to 10000. If the molecular weight is within this range, it is considered that the ejection properties from an inkjet head will be better.

[0019] As described above, the content of the cationic polymer is 0.1% by weight or more and less than 10% by weight based on the total weight of the treatment liquid. The lower limit of the content of the cationic polymer is more preferably 0.5% by weight or more, and even more preferably 1% by weight or more. The upper limit is more preferably 9% by weight or less, and even more preferably 8% by weight or less.

[0020] The treatment liquid of this embodiment further contains an organic acid salt. Examples of the organic acid salt include an organic acid magnesium salt, an organic acid ammonium salt, an organic acid calcium salt, an organic acid aluminum salt, an organic acid sodium salt, and an organic acid potassium salt. These organic acid salts may have water of hydration in the form of a raw material. Examples of the organic acid magnesium salt used in this embodiment include magnesium acetate, magnesium lactate, magnesium sulfate, and trimagnesium phosphate. In addition, the organic acid ammonium salt used in this embodiment is not particularly limited, but from the viewpoint of solubility in water, ammonium acetate, ammonium propionate, ammonium oxalate, ammonium tartrate, ammonium lactate, ammonium succinate (diammonium succinate), diammonium malonate, ammonium malate, ammonium citrate, diammonium hydrogen citrate, triammonium citrate, and ammonium L-glutamate are preferably used.

[0021] Furthermore, although organic acid ammonium salts are excellent in terms of color development and other effects, there is a risk of generating odor, so it is more preferable to use organic acid magnesium salts.

[0022] The content of the organic acid salt is preferably about 0.1 to 15% by weight based on the total weight of the treatment liquid. It is believed that the content of the organic acid salt within this range enhances the aggregation effect of the ink components, and further enhances the color development (image density). The lower limit of the content of the organic acid salt is more preferably 0.5% by weight or more, and even more preferably 1% by weight or more. Furthermore, the upper limit is more preferably 14% by weight or less, and even more preferably 13% by weight or less.

[0023] Furthermore, in the treatment liquid of the present embodiment, it is more preferable that the content of the organic acid salt is greater than the content of the water-soluble cationic polymer. This is believed to improve the texture (feel) of the fabric to be printed when used for textile printing. In this case, it is preferable that the content of the organic acid salt is 1 to 15 wt % based on the total weight of the treatment liquid, which is believed to further enhance the above-mentioned effects.

[0024] When the organic acid salt is an organic acid magnesium salt, the content is preferably about 5 to 11% by weight based on the total treatment liquid, since this allows the cost of the pretreatment liquid to be reduced while maintaining washing fastness. On the other hand, it is also preferable that the content of the organic acid magnesium salt is 12 to 15% by weight based on the total treatment liquid. This is believed to further improve washing fastness when used for textile printing.

[0025] In addition to the above, the treatment liquid of the present embodiment preferably contains a metal salt. By containing a metal salt, it is believed that the above-mentioned flocculation effect can be more effectively obtained and furthermore, washing fastness when used for textile printing is improved.

[0026] The metal salt that can be used in the present embodiment is preferably a polyvalent metal salt composed of a divalent or higher metal ion and an anion. Examples of the divalent or higher metal ion include ions of calcium, magnesium, copper, nickel, zinc, barium, aluminum, titanium, strontium, chromium, cobalt, iron, and the like.

[0027] Specific examples of metal salts include calcium acetate, aluminum acetate, calcium carbonate, calcium nitrate, calcium chloride, calcium sulfate, calcium hydroxide, barium sulfate, barium chloride, zinc carbonate, zinc sulfide, aluminum silicate, calcium silicate, copper nitrate, etc. These metal salts may be used alone or in combination of two or more. Among these, calcium acetate, etc. is more preferably used from the viewpoint of excellent water solubility. These metal salts may have water of hydration in the raw material form.

[0028] When the treatment liquid of this embodiment contains a metal salt, the content thereof is preferably about 0.1 to 5% by weight based on the total weight of the treatment liquid. The lower limit of the content of the metal salt is more preferably 0.5% by weight or more, and even more preferably 1% by weight or more. The upper limit is more preferably 4% by weight or less, and even more preferably 3% by weight or less.

[0029] In addition, in the treatment liquid of the present embodiment, it is preferable that the content of the organic acid salt is greater than the content of the metal salt. This is believed to improve the washing fastness described above while also improving the texture. In this case, it is preferable that the content of the metal salt is 0.1 to 5 wt % with respect to the entire treatment liquid, and the content of the organic acid salt is 1 to 15 wt % with respect to the entire treatment liquid, from the viewpoint of obtaining the above-mentioned effects more effectively.

[0030] In the treatment liquid of this embodiment, the remainder other than the above-mentioned components is usually water or an aqueous solvent consisting of water and an organic solvent.

[0031] Examples of organic solvents that can be contained in the treatment liquid of this embodiment include glycols, alcohols, aliphatic hydrocarbons, aromatic hydrocarbons, ketones, esters, ethers, vegetable oils, etc. Examples of water-soluble organic solvents include polyhydric alcohols, ether compounds of polyhydric alcohols, nitrogen-containing compounds, alcohol compounds, sulfur-containing compounds, propylene carbonate, and ethylene carbonate.

[0032] Examples of polyhydric alcohols include a first diol compound having 5 to 8 carbon atoms, a second diol compound having 2 to 4 carbon atoms, 1,2,6-hexanetriol, glycerin, trimethylolpropane, sugar alcohols (e.g., xylitol), and sugars (e.g., xylose, glucose, and galactose).

[0033] Examples of the first diol compound include 2-methylpentane-2,4-diol, triethylene glycol, tetraethylene glycol, 1,5-pentanediol, and 1,2-hexanediol.

[0034] Examples of the second diol compound include ethylene glycol, 1,2-propanediol, 1,3-propanediol, butylene glycol, and diethylene glycol.

[0035] Examples of the ether compounds of polyhydric alcohols include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol monobutyl ether, dipropylene glycol monobutyl ether, and ethylene oxide adducts of diglycerin.

[0036] Examples of the nitrogen-containing compound include pyrrolidone, N-methyl-2-pyrrolidone, cyclohexylpyrrolidone, and triethanolamine.

[0037] Examples of the alcohol compound include ethanol, isopropyl alcohol, butyl alcohol, and benzyl alcohol.

[0038] Sulfur-containing compounds include, for example, thiodiethanol, thiodiglycerol, sulfolane, and dimethyl sulfoxide.

[0039] Among the above-mentioned organic solvents, it is preferable to use glycols such as propylene glycol.

[0040] The organic solvents as described above may be used alone or in combination of two or more kinds.

[0041] When the treatment liquid of the present embodiment contains an organic solvent, the content of the organic solvent is preferably 3% by weight or more and 50% by weight or less with respect to the total treatment liquid. By containing the organic solvent in the above range, it is possible to provide a treatment liquid with a viscosity that allows stable ejection, and there are also advantages in that the treatment liquid can be prevented from drying out.

[0042] Furthermore, the treatment liquid of this embodiment may contain a surfactant for the purpose of adjusting the surface tension to an appropriate level. There are no particular limitations on the surfactant that can be used, and examples include nonionic surfactants, cationic surfactants, and anionic surfactants.

[0043] When the treatment liquid of the present embodiment contains a surfactant, the content of the surfactant is preferably 0.1% by weight or more and 5% by weight or less based on the total weight of the treatment liquid. By containing the surfactant in the above range, it is possible to provide a treatment liquid with a surface tension that allows stable ejection.

[0044] The treatment liquid of the present embodiment may contain other additives as long as they do not impair the effects of the present disclosure. Examples of the additives include a dissolution stabilizer, a drying inhibitor, an antioxidant, a viscosity adjuster, a pH adjuster, and an anti-mold agent.

[0045] The treatment liquid of this embodiment can be particularly suitably used for inkjet printing. When using a pigment ink that allows printing on many types of fabric, it is necessary to fix the pigment to the surface of the fabric. If the pigment cannot be fixed to the surface of the fabric, there is a problem of poor friction fastness. On the other hand, if the pigment and binder resin do not remain on the surface of the fabric but penetrate deep inside, not only will the color develop poorly, but there is also a problem that the ink and binder resin will get between the fibers and make the fabric feel hard, that is, the texture will deteriorate. Furthermore, in the case of printed materials, it is also required that the printed image will not easily come off even when detergent is mixed in (washing fastness).

[0046] The treatment liquid of this embodiment can improve the above problems. That is, the treatment liquid of this embodiment can provide excellent color development of the ink in the production of printed items. Furthermore, the treatment liquid of this embodiment has the excellent advantages of improving wet friction resistance and washing fastness, and improving the texture of the fabric, making it extremely useful in industrial applications.

[0047] In this embodiment, the treatment liquid does not require the time and effort of applying and drying (padding drying) to the fabric in advance, and by applying it to the fabric using an inkjet system, there is also the advantage that the time and effort required for fabric preparation can be significantly reduced.

[0048] [Inkjet printing device] Next, the inkjet printing apparatus according to this embodiment will be described.

[0049] The inkjet textile printing apparatus 10 according to the present embodiment is characterized by including at least a processing head 1 for discharging a processing liquid onto at least an image forming area of ​​a textile printing object, a recording head 2 for discharging ink onto the image forming area of ​​the textile printing object, and a mounting table 3 for transporting the textile printing object, and the processing liquid discharged from the processing head is the inkjet processing liquid described above. For ease of understanding, FIG. 1 shows each component mainly in a schematic manner, and the size, number, etc. of each component shown in the figure may be changed as appropriate. FIG. 1 is a side view showing a main part of the inkjet textile printing apparatus 10, which is an example of the inkjet textile printing apparatus according to the present embodiment. The inkjet textile printing apparatus 10 shown in FIG. 1 is a flatbed type inkjet textile printing apparatus.

[0050] The inkjet printing apparatus 10 according to this embodiment uses the treatment liquid according to this embodiment described above to treat the printing subject P. Since the treatment liquid according to this embodiment is used, the inkjet printing apparatus 10 can obtain a printed item that has excellent color development, wet friction fastness, washing fastness, texture, and the like.

[0051] 1 includes a processing head 1, a recording head 2, and a mounting table 3. The recording head 2 may include a first recording head 2a, a second recording head 2b, a third recording head 2c, and a fourth recording head 2d.

[0052] The treatment head 1 ejects a treatment liquid onto at least an image forming area of ​​the printing object P. The treatment liquid used here is the treatment liquid described above. The treatment head 1 is not particularly limited, but examples thereof include a piezoelectric head and a thermal inkjet head.

[0053] The recording head 2 ejects ink onto an image forming area of ​​the printing object P. The first recording head 2a, the second recording head 2b, the third recording head 2c, and the fourth recording head 2d of the recording head 2 eject ink of different colors (for example, yellow ink, magenta ink, cyan ink, and black ink). The number of recording heads is not limited to four, and the number of recording heads may be one to three, or five or more. The recording head 2 is not particularly limited, and examples thereof include a piezoelectric type head and a thermal inkjet type head.

[0054] An object P to be printed is placed on the mounting table 3. A processing head 1 and a recording head 2 are disposed above the mounting table 3 so that ink and processing liquid can be ejected onto the object P to be printed. Driven by a motor (not shown), the mounting table 3 moves horizontally in a direction from the processing head 1 toward the recording head 2 (for example, to the left in FIG. 1). As the mounting table 3 moves horizontally, the object P to be printed on the mounting table 3 is transported.

[0055] The object P to be printed may be a woven fabric or a knitted fabric, and examples of the object P to be printed include cotton fabric, silk fabric, linen fabric, acetate fabric, rayon fabric, nylon fabric, polyurethane fabric, and polyester fabric.

[0056] In this embodiment, in the production of a printed product, first, the placement table 3 on which the print target P is placed moves horizontally, and the print target P is transported to a position facing the processing head 1. Then, the processing head 1 ejects the treatment liquid onto the print target P. The processing head 1 may eject the treatment liquid only onto the image formation area of ​​the print target P, may eject the treatment liquid onto an area wider than the image formation area of ​​the print target P, or may eject the treatment liquid onto the entire surface of the print target P. In order to reduce the amount of treatment liquid used and suppress a decrease in the tactile feel of the print target, it is preferable that the processing head 1 eject the treatment liquid only onto the image formation area of ​​the print target P. Since the processing head 1 can accurately control the position where the treatment liquid is ejected, it is possible to eject the treatment liquid only onto the area where the ink is ejected. In order to accurately control the position where the treatment liquid is ejected, it is preferable that the distance between the processing head 1 and the print target P is 1 mm or more and 5 mm or less.

[0057] After the treatment liquid is discharged from the treatment head 1, the placement table 3 on which the object P to be printed is placed further moves horizontally, and the object P to be printed is transported to a position facing the recording head 2. Then, ink is discharged from the recording head 2 onto an image formation area of ​​the object P to be printed. In this way, an image is formed with ink in the image formation area of ​​the object P to be printed.

[0058] Although not shown, after the ink is discharged by the recording head 2, the mounting table 3 on which the printing subject P is placed may further move horizontally, and a post-treatment liquid may be discharged from another treatment head. The post-treatment liquid is a non-color-forming treatment liquid that does not develop color even when it adheres to the printing subject P, and has a function of increasing the fixability and fastness (resistance to rubbing and scraping) of the ink image printed on the printing subject P by the recording head 2. A silicone-based treatment liquid or the like may be used as such a post-treatment liquid. In this way, a treatment film is formed by the post-treatment liquid on the image formed in the image formation area of ​​the printing subject P.

[0059] After the post-treatment liquid is ejected, the placement table 3 on which the object to be printed P is placed further moves horizontally, and the object to be printed P is transported to a position facing a heating unit (not shown), where the heating unit heats the object to be printed P to dry the ink and treatment liquid. The heating temperature is, for example, 120° C. or higher and 180° C. or lower. The heating time is, for example, 1 minute or higher and 10 minutes or lower. The heating dries volatile components contained in the ink and treatment liquid, accelerating the fixation of the ink and treatment liquid to the object to be printed P. As a result, an image is formed with the ink, and the object to be printed P is formed which has been treated with the treatment liquid.

[0060] The treatment liquid of the present embodiment is not limited to use in the inkjet printing apparatus 10, and can be modified, for example, as shown in the following modified examples. For example, the inkjet printing apparatus 10 may be provided with a sprayer for spraying the treatment liquid, instead of the treatment head 1 for ejecting the treatment liquid. Alternatively, the treatment with the treatment liquid may be performed by immersing the object P to be printed in a tank in which the treatment liquid is stored. In addition, in the inkjet printing apparatus 10, the mounting table 3 moves horizontally, but the treatment head 1 and the recording head 2 may move horizontally while the mounting table 3 is fixed. Alternatively, the mounting table 3 may move horizontally in the transport direction of the object P to be printed, or the treatment head 1 and the recording head 2 may move horizontally, and the treatment head 1 and the recording head 2 may move horizontally in the direction perpendicular to the transport direction of the object P to be printed.

[0061] In other words, as long as the processing head 1 and the recording head 2 are provided, the effects of using the processing liquid of this embodiment can be obtained regardless of the type of inkjet textile printing apparatus.

[0062] [ink] The ink used in the inkjet recording together with the treatment liquid of the present embodiment and the ink used in the textile printing apparatus are not particularly limited, and may be, for example, an ink containing a pigment and an aqueous medium. The ink may further contain at least one selected from the group consisting of a surfactant, a polyol, and binder resin particles, as necessary.

[0063] The pigment may be, for example, a dispersible pigment that is dispersed in an aqueous medium. From the viewpoint of obtaining an ink excellent in image density, hue, and color stability, the D50 of the pigment is preferably 30 nm or more and 250 nm or less, and more preferably 70 nm or more and 160 nm or less.

[0064] Examples of pigments include yellow pigments, orange pigments, red pigments, blue pigments, purple pigments, and black pigments. Examples of yellow pigments include CI Pigment Yellow (74, 93, 95, 109, 110, 120, 128, 138, 139, 151, 154, 155, 173, 180, 185, and 193). Examples of orange pigments include CI Pigment Orange (34, 36, 43, 61, 63, and 71). Examples of red pigments include CI Pigment Red (122 and 202). Examples of blue pigments include CI Pigment Blue (15, more specifically 15:3). Examples of purple pigments include CI Pigment Violet (19, 23, and 33). Examples of black pigments include CI Pigment Black (7).

[0065] The pigment content is preferably 1% by weight or more and 12% by weight or less, more preferably 1% by weight or more and 7% by weight or less, based on the total weight of the ink. By making the pigment content 1% by weight or more, the image density of the recorded matter formed can be improved. Also, by making the pigment content 12% by weight or less, an ink with high fluidity can be obtained.

[0066] In particular, the ink of this embodiment preferably contains an anionic pigment. This causes the cationic polymer contained in the treatment liquid and the anionic pigment to react and aggregate electrically on the surface of the recording medium, thereby preventing the binder resin (binder resin described below) contained in the ink from penetrating into the recording medium. This is particularly important when the recording medium is fabric, and prevents the binder resin from penetrating into the gaps between fibers and bonding the fibers together. This can improve the texture (feel, etc.) of the fabric to be printed.

[0067] More preferred anionic pigments are those having an anionic group such as a carboxyl group, a sulfonic acid group, a phosphoric acid group, a phosphonic acid group, a phenylsulfonic acid group, or a phenylcarboxyl group.

[0068] The aqueous medium contained in the ink of this embodiment is a medium containing water as a main component. The aqueous medium may function as a solvent or as a dispersion medium. Specific examples of the aqueous medium include water and a mixture of water and a polar solvent. Examples of polar solvents contained in the aqueous medium include methanol, ethanol, isopropyl alcohol, butanol, and methyl ethyl ketone. The content of water in the aqueous medium is preferably 90% by weight or more, and particularly preferably 100% by weight. The content of the aqueous medium is preferably 5% by weight or more and 70% by weight or less, and more preferably 40% by weight or more and 60% by weight or less, based on the weight of the entire ink.

[0069] Furthermore, the ink contains a surfactant, which improves the wettability of the ink to the recording target. Examples of surfactants include anionic surfactants, cationic surfactants, nonionic surfactants, and amphoteric surfactants. The surfactant contained in the ink is preferably a nonionic surfactant. The nonionic surfactant is preferably a surfactant having an acetylene glycol structure, and more preferably an acetylene diol ethylene oxide adduct. The HLB value of the surfactant is preferably 3 to 20, more preferably 6 to 16, and even more preferably 7 to 10. The HLB value of the surfactant is calculated, for example, by the Griffin method using the formula "HLB value = 20 x (sum of formula weights of hydrophilic parts) / molecular weight". In order to improve image density while suppressing image offset, the content of the surfactant is preferably 0.1 to 5.0% by weight, and more preferably 0.5 to 2.0% by weight, based on the weight of the entire ink.

[0070] Furthermore, the ink contains a polyol, so that the viscosity of the ink can be suitably adjusted. The polyol contained in the ink is preferably a diol or a triol. Examples of diols include glycol compounds, more specifically, ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, and tetraethylene glycol. Examples of triols include glycerin.

[0071] When the ink contains a polyol, in order to suitably adjust the viscosity of the ink, the polyol content is preferably 5 to 60% by weight, and more preferably 20 to 50% by weight, of the total weight of the ink.

[0072] The binder resin particles contained in the ink of this embodiment are present in a dispersed state in an aqueous medium. The binder resin particles function as a binder that bonds the subject to be printed and the pigment. Therefore, by including the binder resin particles in the ink, a printed item with excellent pigment fixation can be obtained.

[0073] Examples of the resin contained in the binder resin particles include urethane resin, (meth)acrylic resin, styrene-(meth)acrylic resin, styrene-maleic acid copolymer, vinylnaphthalene-(meth)acrylic acid copolymer, and vinylnaphthalene-maleic acid copolymer. The resin contained in the binder resin particles is preferably urethane resin. The content of the urethane resin in the binder resin particles is preferably 80% by weight or more, more preferably 100% by weight.

[0074] The content of the binder resin is preferably 1% by weight or more and 20% by weight or less, more preferably 2% by weight or more and 10% by weight or less, based on the weight of the entire ink. When the content of the binder resin particles is 1% by weight or more, a recording subject with excellent pigment fixation can be obtained. On the other hand, when the content of the binder resin particles is 20% by weight or less, the ink can be stably discharged onto the recording subject.

[0075] Furthermore, the ink of this embodiment may further contain known additives (more specifically, a dissolution stabilizer, a drying inhibitor, an antioxidant, a viscosity adjuster, a pH adjuster, an anti-mold agent, etc.) as necessary.

[0076] The ink used in this embodiment is produced by, for example, mixing the pigment, the aqueous medium, and components added as necessary (for example, surfactant, polyol, and binder resin particles) using a mixer. The mixing time is, for example, from 1 minute to 30 minutes. EXAMPLES

[0077] The present disclosure will be described in more detail below with reference to examples, but the present disclosure is not limited to these examples in any way.

[0078] Example 1 As a water-soluble cationic polymer, "PAS-A5" (manufactured by Nittobo Medical Co., Ltd.) was used in an amount of 3 parts by weight (solid content), as an organic acid salt, ammonium acetate was used in an amount of 10 parts by weight, and non-ionic 1 part by weight of surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.), 30 parts by weight of propylene glycol, and the remainder of water were mixed (total 100 parts by weight), and then filtered through a 5 μm filter to obtain treatment liquid 1.

[0079] Example 2 Treatment liquid 2 was obtained in the same manner as in Example 1, except that the content of the water-soluble cationic polymer "PAS-A5" (manufactured by Nittobo Medical Co., Ltd.) was changed from 3 parts by weight to 9 parts by weight.

[0080] Example 3 Treatment liquid 3 was obtained in the same manner as in Example 1, except that the content of ammonium acetate was changed from 10 parts by weight to 15 parts by weight.

[0081] Example 4 Treatment liquid 4 was obtained in the same manner as in Example 1, except that the content of the water-soluble cationic polymer "PAS-A5" (manufactured by Nittobo Medical Co., Ltd.) was changed from 3 parts by weight to 0.5 parts by weight.

[0082] Example 5 Three parts by weight (solids) of "PAS-A5" (manufactured by Nittobo Medical Co., Ltd.) as a water-soluble cationic polymer, 15 parts by weight of ammonium acetate as an organic acid salt, 3 parts by weight of calcium acetate monohydrate as a metal salt, 1 part by weight of nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.), 30 parts by weight of propylene glycol, and the remainder of water were mixed (total 100 parts by weight), and then filtered through a 5 μm filter to obtain treatment liquid 5.

[0083] Example 6 Treatment liquid 6 was obtained in the same manner as in Example 5, except that the content of calcium acetate monohydrate was changed from 3 parts by weight to 5 parts by weight.

[0084] Example 7 Treatment liquid 7 was obtained in the same manner as in Example 5, except that the content of calcium acetate monohydrate was changed from 3 parts by weight to 6 parts by weight.

[0085] Example 8 Treatment liquid 8 was obtained in the same manner as in Example 1, except that the content of ammonium acetate was changed from 10 parts by weight to 16 parts by weight.

[0086] Example 9 Treatment solution 9 was obtained in the same manner as in Example 5, except that the amount of ammonium acetate was changed from 15 parts by weight to 5 parts by weight.

[0087] Example 10 Treatment liquid 10 was obtained in the same manner as in Example 2, except that the amount of ammonium acetate was changed from 10 parts by weight to 9 parts by weight.

[0088] Example 11 Treatment solution 11 was obtained in the same manner as in Example 1, except that ammonium acetate was changed to magnesium acetate tetrahydrate.

[0089] Example 12 Treatment liquid 12 was obtained in the same manner as in Example 2, except that ammonium acetate was changed to magnesium acetate tetrahydrate.

[0090] (Example 13) Treatment solution 13 was obtained in the same manner as in Example 3, except that ammonium acetate was changed to magnesium acetate tetrahydrate.

[0091] Example 14 Treatment liquid 14 was obtained in the same manner as in Example 4, except that ammonium acetate was changed to magnesium acetate tetrahydrate.

[0092] Comparative Example 1 10 parts by weight (solids) of "PAS-A5" (manufactured by Nittobo Medical Co., Ltd.) as a water-soluble cationic polymer, 10 parts by weight of ammonium acetate as an organic acid salt, 1 part by weight of nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.), 30 parts by weight of propylene glycol, and the remainder of water were mixed (total 100 parts by weight), and then filtered through a 5 μm filter to obtain treatment liquid 15.

[0093] Comparative Example 2 15 parts by weight (solids) of "PAS-A5" (manufactured by Nittobo Medical Co., Ltd.) as a water-soluble cationic polymer, 3 parts by weight of ammonium acetate as an organic acid salt, 1 part by weight of nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.), 30 parts by weight of propylene glycol, and the remainder of water were mixed (total 100 parts by weight), and then filtered through a 5 μm filter to obtain treatment liquid 16.

[0094] Comparative Example 3 Treatment liquid 17 was obtained in the same manner as in Comparative Example 1, except that the content of ammonium acetate was changed from 10 parts by weight to 3 parts by weight.

[0095] Comparative Example 4 Three parts by weight (solids) of water-soluble cationic polymer "PAS-A5" (manufactured by Nittobo Medical Co., Ltd.), one part by weight of nonionic surfactant "Surfynol 440" (manufactured by Nissin Chemical Industry Co., Ltd.), 30 parts by weight of propylene glycol, and the remainder of water were mixed together (total 100 parts by weight), and then filtered through a 5 μm filter to obtain treatment liquid 18.

[0096] Comparative Example 5 Treatment liquid 19 was obtained in the same manner as in Comparative Example 4, except that the content of the water-soluble cationic polymer "PAS-A5" was changed from 3 parts by weight to 9 parts by weight.

[0097] Comparative Example 6 10 parts by weight of ammonium acetate as an organic acid salt, 1 part by weight of nonionic surfactant “Surfynol 440” (manufactured by Nissin Chemical Industry Co., Ltd.), 30 parts by weight of propylene glycol, and the remainder of water were mixed (total 100 parts by weight), and then filtered through a 5 μm filter to obtain treatment liquid 20.

[0098] The formulations of the treatment solutions of the above examples and comparative examples are summarized in Table 1.

[0099] [Table 1]

[0100] (Ink Preparation) The ink was prepared using anionic pigment dispersion “AE-2078F” (manufactured by Sanyo Pigment Co., Ltd.) with a pigment concentration of 20%, urethane dispersion “Superflex 470” (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) with a solid content of 38%, nonionic surfactant “Surfynol 440” (manufactured by Nissin Chemical Industry Co., Ltd.), propylene glycol, and water.

[0101] The specific ink composition was 4% by weight of pigment, 8% by weight of urethane, 30% by weight of propylene glycol, 1% by weight of surfactant, and the remainder was water. After mixing in the above ratio, the mixture was filtered through a 5 μm filter to obtain the ink.

[0102] (Preparation of post-treatment solution) A post-treatment liquid was prepared using a silicone oil emulsion "POLON-MF-51" (manufactured by Shin-Etsu Chemical Co., Ltd.) with a silicone oil content of 39%, propylene glycol, and water. The specific composition was silicone oil: 10% by weight, propylene glycol: 30% by weight, and the remainder: water. After mixing in the above ratio, the mixture was filtered through a 5 μm filter to obtain a post-treatment liquid.

[0103] <Print> For inkjet printing, a flatbed printing jig with Kyocera KJ4B heads aligned in the transport direction was used. Pre-treatment liquid was placed in the first head, ink in the second head, and post-treatment liquid in the third head, and inkjet printing was performed under the following conditions. Fabric used: Polyester tropical Fabric / head distance: 3mm, head temperature: 25℃ Drying: 150℃ 3 minutes (oven)

[0104] <Evaluation test> (Image Density) The color was measured using a fluorescence spectrophotometer FD-5 (manufactured by Konica Minolta, Inc.) The evaluation criteria were as follows. Image density (OD) 1.3 or more "〇" Good color development Image density (OD) less than 1.3 "X" Poor color development

[0105] (Friction resistance) According to the wet test of the friction tester type II (Gakushin type) method described in JIS L-0849:2013 (Test method for color fastness to friction), the solid image formed on the evaluation printed material was rubbed with a white cotton cloth for friction. The degree of coloring of the white cotton cloth for friction after rubbing was evaluated according to the "criteria for judging discoloration" described in Clause 10 (Judgment of color fastness) of JIS L-0801:2011 (General rules for color fastness test method). The degree of coloring of the white cotton cloth for friction was judged on a 9-level scale (in order of increasing degree of contamination: 1st grade, 1st to 2nd grade, 2nd grade, 2nd to 3rd grade, 3rd grade, 3rd to 4th grade, 4th grade, 4th to 5th grade, and 5th grade). The smaller the degree of coloring of the white cotton cloth for friction (closer to grade 5), the better the friction fastness. From the degree of coloring of the white cotton cloth for friction after the friction test, the wet friction fastness was evaluated according to the following standards. Wet friction fastness: Grade 3 or higher "〇": Good wet friction fastness Wet friction fastness Less than grade 3 "X" Poor wet friction fastness

[0106] (Texture) An unused printing object was folded in half along the warp (in the length direction), and the distance (loop height) between the lower fabric and the upper fabric at the fold was measured. The measured loop height of the unused printing object was taken as the loop height before printing. Next, the area where the solid image of the evaluation printing object was formed was folded in half along the warp (in the length direction), and the loop height was measured. The measured loop height of the evaluation printing object was taken as the loop height after printing. The change rate of the loop height before and after printing (unit: %) was calculated according to the formula "change rate of loop height = 100 x loop height after printing / loop height before printing". The lower the change rate of the loop height, the less the printing object becomes hard or bulges after printing, and therefore the more the deterioration of the tactile feel of the printed object is suppressed. The evaluation criteria were as follows. Less than 130% "Good": Little change in texture, good 130% or more "X": Texture has changed to hardness and is defective

[0107] (Washing fastness) The printed textile for evaluation was treated with a launderometer (washing tester) according to the A-2 method described in JIS L-0844:2011 (Testing method for color fastness to washing). After rinsing, spin-drying, and drying, the degree of discoloration of the printed textile for evaluation was judged according to the "Criteria for judging discoloration". The evaluation criteria were as follows: Washing fastness (discoloration) Grade 3-4 or higher "○" Good washing fastness Washing fastness (discoloration) Less than grade 3-4 "X" Poor washing fastness The results of the above evaluation tests are summarized in Table 2.

[0108] [Table 2]

[0109] (Consideration) From the results in Table 2, it was confirmed that the use of the treatment liquid of the present disclosure results in a printed product with good color development (image density) and excellent wet rub fastness, texture, and washing fastness. In particular, it was also found that the use of the treatment liquids of Examples 5 to 7 and 9 further containing a metal salt results in a printed product with very excellent washing fastness. Furthermore, from the results of Examples 3 and 8, it was also found that a content of an organic acid salt of 15% by weight or less results in better wet rub fastness. Furthermore, from the results of Examples 2 and 10, it was also found that the image density is improved when the content of the organic acid salt is greater than the content of the cationic polymer. Furthermore, from the results of Examples 6 and 9, it was also found that the image density is improved when the content of the organic acid salt is greater than the content of the metal salt.

[0110] Furthermore, from the results of Examples 11 to 14, it was also confirmed that when magnesium acetate is used as an organic acid salt, if the content relative to the entire treatment liquid is relatively high (approximately 12 to 15% by weight), the treatment liquid has excellent washing fastness even without containing a metal salt.

[0111] On the other hand, when the treatment liquids of Comparative Examples 1 to 3, in which the content of the water-soluble cationic polymer is 10% by weight or more, were used, it was shown that sufficient wet rub fastness could not be obtained. Furthermore, in Comparative Examples 4 and 5, in which a treatment liquid not containing an organic acid salt was used, and in Comparative Example 6, in which a treatment liquid not containing a water-soluble cationic polymer was used, the image density was poor. Furthermore, in Comparative Example 6, the washing fastness was also insufficient. [Explanation of symbols]

[0112] 1 Processing head 2 Recording head 2a First recording head 2b Second recording head 2c 3rd recording head 2d 4th recording head 3. Placement table 10 Inkjet printing equipment P Printing object

Claims

1. Contains a water-soluble cationic polymer and an organic acid salt, The content of the water-soluble cationic polymer is 0.1% by weight or more and less than 10% by weight based on the total weight of the treatment liquid, The treatment liquid for inkjet printing, wherein the content of the organic acid salt is 0.1 to 15% by weight based on the total weight of the treatment liquid.

2. The inkjet treatment liquid according to claim 1 , wherein the organic acid salt is a magnesium salt of an organic acid.

3. The inkjet treatment liquid according to claim 1 , wherein the content of the organic acid salt is greater than the content of the water-soluble cationic polymer.

4. The inkjet treatment liquid according to claim 3 , wherein the content of the organic acid salt is 1% by weight or more based on the total weight of the treatment liquid.

5. 3. The inkjet treatment liquid according to claim 2, wherein the content of the organic acid magnesium salt is 5 to 11% by weight based on the total weight of the treatment liquid.

6. 3. The inkjet treatment liquid according to claim 2, wherein the content of the organic acid magnesium salt is 12 to 15% by weight based on the total weight of the treatment liquid.

7. The inkjet treatment liquid according to claim 1 or 2, further comprising an organic solvent.

8. The inkjet treatment liquid according to claim 1 or 2, further comprising a surfactant.

9. The inkjet treatment liquid according to claim 1 or 2, which is for textile printing.

10. a processing head that ejects a processing liquid onto at least an image forming area of ​​an object to be printed; a recording head that ejects ink onto an image forming area of ​​the object to be printed; A mounting table for transporting the object to be printed, 3. An ink-jet printing apparatus, wherein the treatment liquid discharged from the treatment head is the ink-jet treatment liquid according to claim 1.

11. A method for producing a textile printing method comprising the steps of: discharging a processing liquid from a processing head onto at least an image forming area of ​​a textile printing object; and discharging ink from a recording head onto the image forming area, The ink-jet printing method, wherein the treatment liquid is the ink-jet treatment liquid according to claim 1 or 2.

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