Ink-jet treatment liquid, device for ink-jet textile printing, and method for ink-jet textile printing

Abstract

To provide an ink-jet treatment liquid that ensures stable ejection from an inkjet head component and exhibits excellent storage stability.SOLUTION: One aspect of the present invention relates to an ink-jet treatment liquid which comprises emulsified particles including a silicone oil, surfactants, and an aqueous medium, wherein the content of the silicone oil is 5-15 mass% with respect to the whole treatment liquid and the surfactants comprise a first surfactant, which contains an alkyl group having 12-14 carbon atoms, and a second surfactant, which contains an alkyl group having 16-18 carbon atoms.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] In the inkjet recording method, it is known that a treatment liquid is applied after application of ink in order to suppress deformation of the recording medium and to improve image fixation.

[0003] For example, Patent Document 1 discloses that feathering, bleeding, and paper deformation can be suppressed by using a treatment liquid containing a surfactant. The document also reports that it is particularly preferable to use a treatment liquid containing two types of surfactants.

[0004] It has also been reported that by including a surfactant in an inkjet recording liquid, ink drying properties, optical density, feathering, and image fixing properties can be simultaneously achieved (Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-16556 A [Patent Document 2] JP 2001-226616 A Summary of the Invention

[0006] A treatment liquid for inkjet according to one aspect of the present disclosure is a treatment liquid for inkjet comprising emulsified particles containing silicone oil, a surfactant, and an aqueous medium, wherein the content of the silicone oil is 5% by mass or more and 15% by mass or less with respect to the entire treatment liquid, and the surfactant comprises a first surfactant containing an alkyl group having 12 to 14 carbon atoms, and a second surfactant containing an alkyl group having 16 to 18 carbon atoms. [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 treatment liquid described in Patent Document 1 contains a surfactant, but the purpose is to improve image quality and suppress paper deformation, and no consideration is given to the storage stability of the treatment liquid. Furthermore, the invention described in Patent Document 2 relates to the inkjet recording liquid itself, not the treatment liquid, and furthermore, the document does not describe improving the storage stability of the inkjet recording liquid.

[0009] On the other hand, in the textile printing technology using inkjet, a post-treatment liquid containing silicone oil is sometimes used to ensure the friction fastness of printed textiles.The present inventors' research has revealed that in the post-treatment liquid containing silicone oil discharged by inkjet, it is necessary to control the particle size of silicone oil in order to ensure discharge stability.And it has also been found that this can be adjusted by adding a surfactant to the post-treatment liquid.

[0010] However, it has been found that when the post-treatment liquid containing silicone oil and surfactant is stored for a long period of time, the surfactant may separate from the silicone oil surface, making it difficult to maintain the desired particle size. If the particle size of silicone oil cannot be maintained within an appropriate range, there is a problem that it is difficult to ensure ejection stability.

[0011] Furthermore, both of the technologies described in Patent Documents 1 and 2 above relate to inkjet image forming methods for printing mainly on paper media such as plain paper and low-liquid-absorbency recording media such as film sheets, and are intended to form good images with suppressed bleeding, etc., and are not expected to be used for textile printing on fabrics, etc. However, when inkjet recording is used for textile printing, in addition to image quality, etc., characteristics specific to textile printing, such as friction fastness, are also required.

[0012] Hereinafter, the embodiments of the present disclosure will be described in detail, but the present disclosure is not limited thereto. In this specification, the volume median diameter (D 50 Unless otherwise specified, the measured value of volume median diameter is the median diameter measured using a laser diffraction / scattering particle size distribution analyzer (LA-950 manufactured by Horiba, Ltd.). Hereinafter, the volume median diameter is referred to as "D 50 ". Unless otherwise specified, the "main component" of a material means the component that is contained in the largest amount in the material on a mass basis. Unless otherwise specified, the "specific gravity" means the specific gravity at 25°C. Acrylic and methacrylic may be collectively referred to as "(meth)acrylic". Each component described in this specification may be used alone or in combination of two or more types.

[0013] [Inkjet treatment liquid] An inkjet treatment liquid according to one embodiment of the present disclosure (hereinafter, sometimes simply referred to as "treatment liquid") is an inkjet treatment liquid comprising emulsified particles containing silicone oil, a surfactant, and an aqueous medium, characterized in that the content of the silicone oil is 5% by mass or more and 15% by mass or less with respect to the entire treatment liquid, and the surfactant comprises a first surfactant containing an alkyl group having 12 to 14 carbon atoms, and a second surfactant containing an alkyl group having 16 to 18 carbon atoms.

[0014] With the above-mentioned configuration, the treatment liquid of the present embodiment is stably ejected from the inkjet head member and has excellent storage stability. That is, according to the present disclosure, it is possible to provide an inkjet treatment liquid that can be stably ejected from the inkjet head member and has excellent storage stability. Furthermore, when the inkjet treatment liquid of the present disclosure is used for textile printing, it has the advantage of also having excellent friction fastness.

[0015] The treatment liquid of this embodiment is suitable for use in, for example, an inkjet textile printing apparatus and an inkjet textile printing method described below. The treatment liquid of this embodiment is a treatment liquid for post-treatment. In other words, after an image is formed in an image formation area of ​​a textile printing target with ink, the image formation area is post-treated with the treatment liquid of this embodiment.

[0016] When the treatment liquid of this embodiment is used for textile printing, in addition to the above-mentioned advantages, there is also the advantage that the rub fastness can be improved.

[0017] The composition of the inkjet treatment liquid according to this embodiment will be described below. The treatment liquid according to this embodiment contains emulsified particles containing silicone oil, a surfactant, and an aqueous medium. In other words, the treatment liquid according to this embodiment is an emulsion in which emulsified particles are dispersed in an aqueous medium, and more specifically, is an oil-in-water (O / W) type emulsion.

[0018] (emulsified particles) The emulsified particles contained in the treatment liquid contain silicone oil. The silicone oil contained in the emulsified particles is not particularly limited, but preferably contains at least non-modified silicone oil. By containing non-modified silicone oil, it is possible to produce a printed material with excellent friction fastness, especially wet friction fastness, when used for textile printing.

[0019] Specific examples of non-modified silicone oils include dimethylpolysiloxane, methylphenylsilicone oil, methylhydrogensilicone oil, etc. Among these, it is preferable to use dimethylpolysiloxane, etc.

[0020] In addition, the silicone oil may be a silicone oil other than the non-modified silicone oil, or may contain both the non-modified silicone oil and the other silicone oil.In this case, both the non-modified silicone oil and the other silicone oil may be contained in one emulsified particle.Alternatively, the emulsified particles contained in the treatment liquid may be two or more kinds, for example, the first emulsified particle may contain the non-modified silicone oil, and the second emulsified particle may contain the other silicone oil.As the other silicone oil, for example, ionic group-containing silicone oil and the like may be mentioned.

[0021] When the treatment liquid of this embodiment is used for textile printing, the viscosity of the silicone oil is 500 mm 2 / s (i.e. mm 2 The viscosity of the silicone oil is preferably 500 mm / sec or more. 2 / s or more, it is considered that the silicone oil is less likely to be detached from the printed material due to friction, and a printed material having excellent dry and wet abrasion fastness can be produced. Also, as already mentioned, the treatment liquid according to this embodiment has excellent ejection properties from the treatment head of the inkjet printing device. When the treatment liquid is ejected from the treatment head, the amount of treatment liquid used is reduced compared to when the printed material is immersed in the treatment liquid, so that the treatment liquid can be ejected from the treatment head at a speed of 500 mm. 2Even when a silicone oil with a high viscosity of 1000g / s or more is used in the treatment liquid, stiffness is unlikely to be caused on the printed object, and deterioration in the feel of the printed product is further suppressed.

[0022] The upper limit of the viscosity of the silicone oil is not particularly limited. The viscosity of the silicone oil is, for example, 100,000 mm 2 / s or less is preferable, and 6000 mm 2 The viscosity of the silicone oil is preferably 500 mm / s or less. 2 / s, 700mm 2 / s, 900mm 2 / s, 1000mm 2 / s, 1100mm 2 / s, 1200mm 2 / s, 1500mm 2 / s, 1700mm 2 / s, 1800mm 2 / s, 2000mm 2 / s, 3000mm 2 / s, 5700mm 2 / s, and 6000mm 2 / s.

[0023] In this embodiment, the viscosity of the silicone oil refers to the kinetic viscosity at 25° C. When the emulsified particles contain two or more kinds of silicone oils (for example, ionic group-containing silicone oil and other silicone oils), the viscosity of the silicone oil refers to the viscosity of the mixture of two or more kinds of silicone oils.

[0024] The viscosity of the silicone oil is a value measured according to the method described in JIS (Japanese Industrial Standards) Z8803:2011 (Method of measuring viscosity of liquid).Specifically, for example, the silicone oil is extracted from the treatment liquid with toluene, washed, and dried to separate the silicone oil from the treatment liquid, and the viscosity of the silicone oil can be measured.

[0025] The silicone oil content in the treatment liquid of this embodiment is 5% by mass or more and 15% by mass or less. By making the silicone oil content within the above range, the dischargeability of the treatment liquid can be more stabilized, and the friction fastness can be improved when used for textile printing. The silicone oil content in the treatment liquid is preferably 7% by mass or more. In addition, the silicone oil content in the treatment liquid is preferably 13% by mass or less.

[0026] In this embodiment, the content of silicone oil in treatment liquid means the percentage of the mass of silicone oil relative to the mass of the whole treatment liquid.When emulsified particles contain two or more kinds of silicone oils (for example, unmodified silicone oil and other silicone oils), the content of silicone oil means the percentage of the total mass of two or more kinds of silicone oils relative to the mass of treatment liquid.

[0027] The emulsion particles may further contain components other than the silicone oil, however, from the viewpoint of producing a printed material having excellent abrasion fastness, it is preferable that the emulsion particles contain only the silicone oil.

[0028] The average particle size of the emulsified particles (particle size dispersed in an aqueous medium) is preferably 100 nm or more and 250 nm or less. By having the average particle size of the emulsified particles in the above range, the treatment liquid of the present embodiment has the advantage of being more excellent in ejection properties from the treatment head of an inkjet device. Furthermore, when used for textile printing, friction fastness can be more reliably obtained. A more preferred range of the average particle size of the emulsified particles is 120 nm or more and 220 nm or less, and more preferably 150 nm or more and 200 nm or less. Alternatively, the average particle size of the emulsified particles may be within a range of two values ​​selected from the group consisting of, for example, 100 nm, 120 nm, 135 nm, 150 nm, 155 nm, 160 nm, 180 nm, 200 nm, 210 nm, 220 nm, and 250 nm.

[0029] In this embodiment, the average particle size refers to a harmonic average particle size (also called a cumulant average particle size) based on scattered light intensity calculated based on the cumulant method. That is, the average particle size of the emulsion particles is a value measured in accordance with the method described in ISO 13321:1996 (Particle size analysis-Photon correlation spectroscopy).

[0030] Furthermore, in this embodiment, when the inkjet treatment liquid is stored at 60° C. for 30 days, the average particle size X of the emulsified particles in the treatment liquid before storage and the average particle size Y of the emulsified particles in the treatment liquid after storage satisfy the following formula: 1.0≦Y / X≦1.05 It is preferable that the following is satisfied.

[0031] By making the average particle size X and the average particle size Y satisfy the above formula, the average particle size of the emulsified particles does not change significantly even when the treatment liquid is stored for a long period of time, so that it is believed that a treatment liquid having excellent storage stability can be obtained more reliably.

[0032] It is more preferable that the above formula satisfies 1.0≦Y / X≦1.03.

[0033] In this specification, the term "processing liquid before storage" preferably refers to the processing liquid immediately after preparation, but may also refer to the processing liquid that has been stored for a predetermined period of time after preparation, unless it has been stored in a particularly harsh environment.

[0034] (Surfactant) The treatment liquid of this embodiment contains, as surfactants, a first surfactant containing an alkyl group having 12 to 14 carbon atoms and a second surfactant containing an alkyl group having 16 to 18 carbon atoms. By containing such surfactants, the treatment liquid can ensure ejection stability. This is because the treatment liquid contains two types of surfactants whose carbon numbers are in the above ranges, which can prevent the above-mentioned emulsified particles dispersed in the treatment liquid from fusing with each other, and can prevent the emulsified particles from becoming larger than necessary. In other words, the treatment liquid of this embodiment contains the surfactants, which can maintain the size (average particle size) of the emulsified particles dispersed in the treatment liquid within an appropriate range.

[0035] If the surfactant contains only one type rather than the two types described above, the surfactant will detach from the silicone oil surface forming the emulsion particles, making it impossible to maintain the average particle size of the emulsion particles.

[0036] Furthermore, when the number of carbon atoms in the alkyl group of the first surfactant is 11 or less, the surfactant is likely to be liberated from the silicone oil in a relatively high temperature range (around 60°C), so it is necessary to increase the amount of the first surfactant in order to ensure dispersion stability in the above temperature range. However, since an increase in the amount of the first surfactant results in thixotropy, the number of carbon atoms in the alkyl group of the first surfactant is set to 12 to 14. In a preferred embodiment, the number of carbon atoms in the alkyl group of the first surfactant is 12 and / or 14.

[0037] On the other hand, if the number of carbon atoms in the alkyl group of the second surfactant is 19 or more, the amount of free groups that do not adhere to (are not incorporated into) the silicone oil increases, resulting in the viscosity of the treatment liquid becoming too high or the development of thixotropy. Therefore, the number of carbon atoms in the alkyl group of the second surfactant is set to 16 to 18. In a preferred embodiment, the number of carbon atoms in the alkyl group of the second surfactant is 16 and / or 18.

[0038] The first surfactant can be any surfactant having an alkyl group with 12 to 14 carbon atoms. Preferably, polyoxyethylene alkyl ether can be used. More specifically, for example, polyoxyethylene lauryl ether (C12), polyoxyethylene tridecyl ether (C13), polyoxyethylene myristyl ether (C14), etc. can be used. Furthermore, the first surfactant may contain two or more compounds having alkyl groups with different carbon numbers.

[0039] The second surfactant can be any surfactant having an alkyl group with 16 to 18 carbon atoms, without any particular limitation. Preferably, polyoxyethylene alkyl ether can be used. More specifically, for example, polyoxyethylene cetyl ether (C16), polyoxyethylene stearyl ether (C18), etc. can be used. Furthermore, the second surfactant may contain two or more compounds having alkyl groups with different carbon numbers.

[0040] Surfactants other than those mentioned above may also be added to the treatment liquid of this embodiment as long as the effects of the present disclosure are not impaired.

[0041] In the treatment liquid of the present embodiment, it is preferable that the content of the second surfactant is less than the content of the first surfactant. This is believed to provide a treatment liquid with better dischargeability and storage stability. Furthermore, it is believed to provide a printed product with better friction fastness, particularly wet friction fastness, when used for textile printing.

[0042] Furthermore, it is preferable that the content of the first surfactant and the content of the second surfactant satisfy the following formula: content of second surfactant / (content of first surfactant+content of second surfactant)=0.15 to 0.25 (mass%). It is considered that ejection properties and storage stability can be more reliably obtained if the content of the second surfactant is within the above range relative to the total content of the first surfactant and the second surfactant. This is because if the content of the second surfactant is too high, thixotropy may occur, which may lead to deterioration of ejection properties and storage stability.

[0043] In the treatment liquid of this embodiment, the total content of the first surfactant and the second surfactant is preferably 0.5% by mass or more and 4.0% by mass or less with respect to the entire treatment liquid. In particular, in order to obtain better storage stability and ejection properties, the lower limit of the total content with respect to the entire treatment liquid is preferably 1.0% by mass or more, and more preferably 1.5% by mass or more. The upper limit of the total content is preferably 2.5% by mass or less, and more preferably 2.0% by mass or less.

[0044] In addition, in the treatment liquid of this embodiment, the total content of the first surfactant and the second surfactant is preferably 9.0% by mass or more and 40.0% by mass or less with respect to the content of silicone oil. In particular, from the viewpoint of obtaining better dischargeability and friction fastness when used for textile printing, the lower limit of the total content of the surfactants with respect to the content of silicone oil is preferably 10.0% by mass or more, and more preferably 15% by mass or more. Also, the upper limit of the total content is preferably 35.0% by mass or less.

[0045] (aqueous medium) The aqueous medium contained in the treatment liquid 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 mass or more, and particularly preferably 100% by mass. The content of the aqueous medium is preferably 50% by mass or more and 90% by mass or less, and more preferably 55% by mass or more and 70% by mass or less, based on the mass of the treatment liquid.

[0046] (Other Ingredients) The treatment liquid of this embodiment may further contain a polyol as necessary. When the treatment liquid contains a polyol, the viscosity of the treatment liquid is suitably adjusted. The polyol is preferably a diol or 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. When the treatment liquid contains a polyol, the content of the polyol is preferably 10% by mass or more and 40% by mass or less, more preferably 15% by mass or more and 35% by mass or less, based on the mass of the treatment liquid.

[0047] The treatment liquid may contain other additives as long as they do not impair the effects of the present disclosure. Examples of the additives include dispersants, dissolution stabilizers, drying inhibitors, antioxidants, viscosity adjusters, pH adjusters, and mold inhibitors.

[0048] (Method of manufacturing the treatment liquid) The manufacturing method of the treatment liquid of this embodiment is not particularly limited, but an example will be described.For example, a homogenizer is used to mix and emulsify silicone oil, surfactant, aqueous medium, and components (e.g., polyol, etc.) that are added as needed.In this way, emulsion particles containing silicone oil are dispersed in the aqueous medium to obtain a treatment liquid.

[0049] (Application) The treatment liquid of this embodiment is particularly suitable for inkjet printing. When using a pigment ink that enables printing on many types of fabric, it is necessary to fix the pigment on the surface of the fabric. If the pigment cannot be fixed on the surface of the fabric, there is a problem that the abrasion fastness is poor.

[0050] The use of the treatment liquid of this embodiment can solve the above problems. That is, the treatment liquid of this embodiment can improve fastness to wet rubbing and dry rubbing in the production of printed textiles, and is therefore extremely useful in industrial applications.

[0051] [Inkjet printing device] Next, the inkjet printing apparatus according to this embodiment will be described.

[0052] The inkjet textile printing apparatus 10 according to the present embodiment is characterized by including at least a recording head 1 for discharging ink onto an image forming area of ​​a textile printing object, a processing head 2 for discharging a processing liquid onto at least 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.

[0053] The inkjet printing apparatus 10 according to this embodiment uses the treatment liquid according to this embodiment described above to treat the printing object P. Since the treatment liquid according to this embodiment is used, the inkjet printing apparatus 10 can obtain a printed product that is excellent in wet rub fastness and dry rub fastness, etc.

[0054] An inkjet printing apparatus 10 shown in Fig. 1 includes a recording head 1, a processing head 2, and a mounting table 3. The recording head 1 has a first recording head 1a, a second recording head 1b, a third recording head 1c, and a fourth recording head 1d.

[0055] The recording head 1 ejects ink onto an image forming area of ​​the printing object P. The first recording head 1a, the second recording head 1b, the third recording head 1c, and the fourth recording head 1d of the recording head 1 eject ink of different colors (for example, yellow ink, magenta ink, cyan ink, and black ink). The recording head 1 is not particularly limited, but examples thereof include a piezoelectric type head and a thermal inkjet type head.

[0056] The processing head 2 ejects a processing liquid for post-processing onto at least the image forming area of ​​the printing object P. The processing liquid is the processing liquid according to the first embodiment. The processing head 2 is not particularly limited, but examples thereof include a piezoelectric type head and a thermal inkjet type head. The inkjet printing device 10 of this embodiment may further include one or more processing liquid tanks (not shown) that contain the processing liquid, in which case the processing liquid is supplied from the processing liquid tank to the processing head 2.

[0057] The printing object P is placed on the mounting table 3. The recording head 1 and the processing head 2 are disposed above the mounting table 3 so that ink and processing liquid can be ejected onto the printing object P. Driven by a motor (not shown), the mounting table 3 moves horizontally in a direction from the recording head 1 toward the processing head 2 (for example, to the left in FIG. 1). As the mounting table 3 moves horizontally, the printing object P on the mounting table 3 is transported.

[0058] The printing object P may be a woven fabric or a knitted fabric, and examples of the printing object P include cotton fabric, silk fabric, linen fabric, acetate fabric, rayon fabric, nylon fabric, polyurethane fabric, and polyester fabric.

[0059] In producing a printed item, first, the mounting table 3 on which the object P to be printed is placed moves horizontally, and the object P to be printed is transported to a position facing the recording head 1. Ink is ejected from the recording head 1 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. After the ink is ejected, the mounting table 3 on which the object P to be printed is placed moves further horizontally, and the object P to be printed is transported to a position facing the processing head 2. A treatment liquid is ejected from the processing head 2 onto at least the image formation area of ​​the object P to be printed. In this way, a treatment film is formed by the treatment liquid on the image formed in the image formation area of ​​the object P to be printed.

[0060] The processing head 2 may eject the treatment liquid only onto the image formation area of ​​the printing object P, may eject the treatment liquid onto an area wider than the image formation area of ​​the printing object P, or may eject the treatment liquid onto the entire surface of the printing object P. In order to reduce the amount of treatment liquid used and suppress deterioration of the tactile feel of the printed product, it is preferable that the processing head 2 eject the treatment liquid only onto the image formation area of ​​the printing object P, and it is more preferable that the processing head 2 eject the treatment liquid only onto the area where the ink is ejected by the recording head 1 within the image formation area. Since the processing head 2 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 2 and the printing object P is 1 mm or more and 5 mm or less. In addition, in order to efficiently proceed with post-processing using the treatment liquid, it is preferable that only the treatment liquid is ejected from the processing head 2.

[0061] After the treatment liquid is ejected from the treatment head 2 onto the object P to be printed, the mounting 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 a heating unit (not shown). The heating unit heats the object P to be printed, thereby drying 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 causes the volatile components contained in the ink and treatment liquid to evaporate, facilitating the fixation of the ink and treatment liquid to the object P to be printed. As a result, a printed item is produced, which is the object P to be printed on which an image is formed with ink and which has been treated with treatment liquid.

[0062] The inkjet printing apparatus 10 according to the second embodiment has been described above. However, the inkjet printing apparatus of the present disclosure is not limited to the inkjet printing apparatus 10 described above, and can be modified, for example, as shown in the following modified examples.

[0063] Regarding the first modified example, the inkjet printing apparatus 10 may be provided with a sprayer that sprays the treatment liquid, instead of the treatment head 2 that ejects the treatment liquid.

[0064] Regarding the second modified example, the treatment with the treatment liquid may be performed by immersing the printing object P in a tank in which the treatment liquid is stored. In the case of immersion, the amount of the treatment liquid discharged, which will be described later in the third embodiment, corresponds to the amount of the treatment liquid applied.

[0065] Regarding the third modified example, in the inkjet printing apparatus 10, the mounting table 3 moves horizontally, but the recording head 1 and the processing head 2 may move horizontally with the mounting table 3 fixed.

[0066] Regarding the fourth variant, the mounting table 3 may move horizontally in the transport direction of the object to be printed P, or the recording head 1 and the processing head 2 may move horizontally, and the recording head 1 and the processing head 2 may move horizontally in a direction perpendicular to the transport direction of the object to be printed P.

[0067] Regarding the fifth modified example, the number of recording heads 1 may be one to three, or five or more.

[0068] The sixth modified example may be an inkjet printing apparatus other than a flatbed type. As long as it is equipped with the recording head 1 and the processing head 2, the effect of using the processing liquid according to the first embodiment can be obtained regardless of the type of the inkjet printing apparatus.

[0069] [Inkjet printing method] Next, the inkjet printing method according to this embodiment will be described with continued reference to FIG. 1. The inkjet printing method according to this embodiment is a method of forming an image in an image forming area of ​​the printing object P using the above-mentioned treatment liquid. Alternatively, the inkjet printing method according to this embodiment is also a method of forming an image in an image forming area of ​​the printing object P using the above-mentioned inkjet printing device 10. Since the inkjet printing method according to this embodiment uses the above-mentioned treatment liquid, it is possible to produce a printed product with excellent friction fastness. Furthermore, since the treatment liquid according to this embodiment has excellent ejection properties from the processing head, it is possible to reliably exert these effects in the inkjet printing method.

[0070] The inkjet printing method of this embodiment includes an ink ejection step and a treatment step. In the ink ejection step, ink is ejected from a recording head 1 onto an image forming area of ​​the printing object P. In the treatment step, a treatment liquid is ejected from a treatment head 2 onto at least the image forming area of ​​the printing object P. The treatment liquid is the treatment liquid according to the first embodiment. The treatment step is preferably a post-treatment step carried out after the ink ejection step. The inkjet printing method may further include a heating step, if necessary.

[0071] In the ink ejection step, the amount of ink ejected onto the printing object P is, for example, 5 g / m 2 More than 40g / m 2 The following is the result.

[0072] In the treatment step, the amount of treatment liquid discharged onto the object to be printed P is, for example, 10 g / m 2 More than 120g / m 2In order to improve the dry rub fastness, the discharge amount of the treatment liquid is 15 g / m 2 More than 30g / m 2 In order to improve the wet friction fastness in addition to the dry friction fastness, the discharge amount of the processing solution is preferably 17 g / m 2 More than 25g / m 2 It is more preferable that:

[0073] [ink] The ink used in inkjet recording together with the treatment liquid of this embodiment, and the ink used in the textile printing apparatus or the textile printing method 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.

[0074] 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.

[0075] 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).

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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

[0088] 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.

[0089] In the examples described later, the average particle size of each emulsified particle is a value measured by the method described below.

[0090] <Method for measuring the average particle size of emulsion particles> The average particle size of the emulsified particles was measured using a laser diffraction particle size distribution analyzer ("Zetasizer Nano ZS" manufactured by Malvern Instruments) in accordance with the method described in ISO 13321: 1996 (Particle size analysis-Photon correlation spectroscopy). For the measurement of the average particle size of the emulsified particles, a measurement sample prepared by diluting the treatment liquid 1000 times with water was used.

[0091] The first and second surfactants used in this example are as follows: (First Surfactant) Surfactant 1 (Polyoxyethylene lauryl ether, alkyl group: C12) Surfactant 2 (Polyoxyethylene tridecyl ether, alkyl group: C13) Surfactant 3 (Polyoxyethylene myristyl ether, alkyl group: C14) (Second Surfactant) Surfactant 4 (Polyoxyethylene cetyl ether, alkyl group: C16) ·Surfactant 5 (Polyoxyethylene stearyl ether, alkyl group: C18).

[0092] Example 1 5 g of non-modified silicone oil ("KF96-3000cs" manufactured by Shin-Etsu Chemical Co., Ltd., dimethylpolysiloxane, viscosity: 3,000 mm 2 / s, specific gravity: 0.97), 63.37g of ion-exchanged water, 30g of propylene glycol, 1.3g of the first surfactant (surfactant 1: C = 12) and 0.33g of the second surfactant (surfactant 4: C = 16) were placed in a beaker. The contents of the beaker were stirred at a rotation speed of 10,000 rpm for 15 minutes using a homogenizer (IKA "Ultra Turrax T25") and allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120 mesh stainless steel filter to obtain treatment liquid 1. Emulsion particles containing non-modified silicone oil were dispersed in treatment liquid 1. The average particle size (X) of the emulsification particles was 115 nm.

[0093] Example 2 10 g of non-modified silicone oil ("KF96-3000cs" manufactured by Shin-Etsu Chemical Co., Ltd., dimethylpolysiloxane, viscosity: 3,000 mm 2 / s, specific gravity: 0.97), 58.37g of ion-exchanged water, 30g of propylene glycol, 1.3g of the first surfactant (surfactant 1: C = 12) and 0.33g of the second surfactant (surfactant 4: C = 16) were placed in a beaker. The contents of the beaker were stirred for 15 minutes at a rotation speed of 10,000 rpm using a homogenizer (IKA "Ultra Turrax T25") and allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120 mesh stainless steel filter to obtain treatment liquid 1. Emulsion particles containing non-modified silicone oil were dispersed in treatment liquid 2. The average particle size (X) of the emulsification particles was 138 nm.

[0094] (Examples 3 to 14 and Comparative Examples 1 to 3) The amounts (wt%) of the non-modified silicone oil, the first surfactant, and the second surfactant were changed to those shown in Table 1, and the ion-exchanged water was adjusted to 100 g by combining the above-mentioned components with 30 g of propylene glycol (fixed). The treatment liquids (treatment liquids 3 to 17) of Examples 3 to 14 and Comparative Examples 1 to 3 were obtained in the same manner as in Example 1. Emulsion particles containing non-modified silicone oil were dispersed in each of the obtained treatment liquids. The average particle size (X) of the emulsification particles in each treatment liquid is shown in Table 2 below.

[0095] [Table 1]

[0096] [Evaluation method] <Storage stability> 400 g of each of the treatment liquids 1 to 17 obtained in each of the Examples and Comparative Examples was placed in a 500 mL plastic container, and the container was left to stand for 30 days in an oven at 60° C. After 30 days, the plastic container stored in the oven was removed, and after the treatment liquid had cooled to room temperature, the average particle size (Y) of the emulsified particles in each treatment liquid was measured, and the dischargeability test described below was performed.

[0097] <Dischargeability> The ejection properties of the treatment liquid were evaluated using an ejection evaluation device (Kyocera Corporation, "KJ4B") that can confirm the ejection of the treatment liquid from the nozzle drop by drop using a camera image. The ejection properties were evaluated both for the treatment liquid before storage (immediately after the preparation of the treatment liquid) and for the treatment liquid after storage for 30 days as described above in the storage stability section.

[0098] The conditions for the discharge evaluation device were set as follows. Discharge evaluation machine conditions: Head temperature: 32℃ Processing liquid discharge rate from head: 10g / m 2 Drive frequency: 30kHz

[0099] The specific method of evaluating the dischargeability is as follows. First, the camera position was adjusted so that three nozzles could be seen in one field of view using the discharge evaluation machine. Next, discharge of the treatment liquid was started, and whether or not the treatment liquid was normally discharged was visually confirmed through the camera image for one minute. After one minute had passed, the number of nozzles that normally discharged the treatment liquid was counted. Here, the nozzles that normally discharged the treatment liquid are nozzles other than the nozzles that did not normally discharge the treatment liquid (nozzles that did not discharge the treatment liquid straight, nozzles that did not discharge the treatment liquid, nozzles from which the treatment liquid overflowed, etc.). Furthermore, the camera position was moved, and the dischargeability of the treatment liquid was repeatedly confirmed through the camera image for one minute for another nozzle. A total of 36 nozzles were confirmed at a total of 12 locations. Finally. The nozzles that normally discharged the treatment liquid were totaled and the dischargeability of the treatment liquid was evaluated according to the following criteria. (Judgment criteria) A:36 B:34~35 C:33 or less

[0100] <Friction resistance> Printed textiles were produced using the treatment solutions obtained in the Examples and Comparative Examples, and the rubbing fastness (wet rubbing fastness and dry rubbing fastness) of each printed textile was evaluated.

[0101] (Ink Preparation) First, the ink used for printing was prepared. 125 g of ion-exchanged water and 2 g of a nonionic surfactant ("Surfynol (registered trademark) 440" manufactured by Nissin Chemical Industry Co., Ltd., content: acetylene glycol ethylene oxide adduct) were placed in a 1 L three-neck flask equipped with a stirring blade. While stirring the contents of the flask, 165 g of propylene glycol, 100 g of a black pigment dispersion ("AE2078F" manufactured by Sanyo Pigment Co., Ltd., content: CI Pigment Black 7, solid content concentration: 20% by mass), and 108 g of a binder resin particle dispersion ("Superflex 470" manufactured by Daiichi Kogyo Seiyaku Co., Ltd., content: polyurethane dispersion, solid content concentration: 38% by mass) were added in this order to the flask. The contents of the flask were stirred for 10 minutes to obtain an ink.

[0102] (Preparation of printed items for evaluation) Using the inks and treatment liquids 1 to 17, printed items for evaluation were prepared.

[0103] The subject of printing was cotton broadcloth (manufactured by Shikisensha Co., Ltd., size: A4 size, cotton count of warp and weft: 40 / 1, warp density: 130 threads / inch, weft density: 75 threads / inch, basis weight: 122g / m 2 The evaluation prints were made using an inkjet printer. A printer ("Colorio (registered trademark) PX-045A" manufactured by Seiko Epson Corporation) was used. The first ink chamber of the first cartridge was filled with ink, and the second ink chamber of the second cartridge was filled with treatment liquid. Next, the first cartridge and the second cartridge were mounted on an inkjet printer. The ink filled in the first ink chamber was ejected from the recording head of the inkjet printer, and the treatment liquid filled in the second ink chamber was ejected from the treatment head of the inkjet printer.

[0104] Using an inkjet printer, the ink ejection rate was 20 g / m 2 So, write The ink was then discharged from the recording head onto the object to be printed, forming a solid image of the ink. Next, the inkjet printer was used to discharge the treatment liquid at a rate of 20 g / m2 as described above. 2 Become The treatment liquid was discharged from the treatment head onto the printing object as shown in FIG. 1. In this way, a treatment film of the same size as the solid image of the ink was formed by the treatment liquid on the solid image of the ink. The printing object was then heated at 160°C for 3 minutes to dry the ink and the treatment liquid, and a printed item for evaluation was obtained.

[0105] (Method of evaluating friction fastness) According to the dry test and 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 dry friction fastness and the wet friction fastness were evaluated according to the following standards. The results of the dry test were regarded as dry friction fastness, and the results of the wet test were regarded as wet friction fastness. A and B were regarded as pass, and C was regarded as fail. The determined friction fastness and the evaluation results are shown in Table 2 below.

[0106] (Evaluation criteria for dry friction fastness) Evaluation A: Dry friction fastness is grade 4 or higher. Evaluation B: Dry friction fastness is grade 3 to 4. Evaluation C: Dry friction fastness is grade 3 or lower.

[0107] (Evaluation criteria for wet friction fastness) Evaluation A: Wet friction fastness is grade 3 or higher. Evaluation B: Wet friction fastness is grade 2 to 3. Evaluation C: Wet friction fastness is grade 2 or lower.

[0108] The results of the above evaluation tests are summarized in Table 2.

[0109] [Table 2]

[0110] (Consideration) From the results in Table 2, it was confirmed that the treatment liquid of the present disclosure has excellent ink-jet dischargeability, and when used for textile printing, the resulting printed textile has excellent friction fastness. It was also confirmed that even after storage at 60°C for 30 days, there was little change in the average particle size of the emulsified particles in the treatment liquid, and the dischargeability did not deteriorate.

[0111] Furthermore, considering the results of Examples 11 to 14, it was found that if the total content of the surfactants is within a more suitable range, a treatment liquid with better storage stability and ejection properties can be obtained. In other words, Examples 11 to 14 show that if the total content of the surfactants is low, the ejection properties tend to be poor, and if it is high, in addition to the deterioration of the ejection properties, the wet friction fastness also tends to deteriorate slightly. Furthermore, the results of Examples 11 to 12 show that if the content of the second surfactant / (the content of the first surfactant + the content of the second surfactant) is within a specified range, the treatment liquid has better storage stability and ejection properties.

[0112] On the other hand, in Comparative Example 1, in which a treatment liquid containing only the first surfactant was used, the average particle size of the emulsion particles increased after 30 days of storage, and the ejection properties after storage deteriorated. In other words, Comparative Example 1 had poor storage stability.

[0113] The treatment liquid of Comparative Example 2, which contained too little silicone oil, was inferior in dischargeability and friction fastness (particularly, wet friction fastness).The treatment liquid of Comparative Example 3, which contained too much silicone oil, was inferior in all of storage stability, dischargeability, and friction fastness (particularly, wet friction fastness). [Explanation of symbols]

[0114] 1: Recording head 1a: first recording head 1b: second recording head 1c: 3rd recording head 1d: 4th recording head 2: Processing head 3: Placement table 10: Inkjet printing equipment P: Printing target

Claims

1. A post-treatment liquid for inkjet printing, comprising emulsified particles containing silicone oil, a surfactant, and an aqueous medium, The surfactant comprises a second surfactant including an alkyl group having 16 to 18 carbon atoms, and a first surfactant including an alkyl group having a carbon number less than that of the alkyl group of the second surfactant.

2. The inkjet post-treatment liquid according to claim 1 , wherein the surfactant is a polyoxyethylene alkyl ether.

3. The inkjet post-treatment liquid according to claim 1 , wherein the first surfactant contains two or more compounds having alkyl groups with different numbers of carbon atoms.

4. The inkjet post-treatment liquid according to claim 1 , wherein the second surfactant contains two or more compounds having alkyl groups with different numbers of carbon atoms.

5. The post-treatment liquid for inkjet according to claim 1 , wherein the content of the second surfactant is less than the content of the first surfactant.

6. The content of the first surfactant and the content of the second surfactant are expressed by the following formula: The inkjet post-treatment liquid according to claim 1, wherein the second surfactant content / (first surfactant content+second surfactant content)=0.15 to 0.25 (mass %) is satisfied.

7. The post-treatment liquid for inkjet according to claim 6 , wherein a total content of the first surfactant and the second surfactant is 0.5% by mass or more and 4.0% by mass or less with respect to the entire treatment liquid.

8. The post-treatment liquid for inkjet according to claim 6 , wherein a total content of the first surfactant and the second surfactant is 9.0% by mass or more and 40.0% by mass or less with respect to a content of the silicone oil.

9. The inkjet post-treatment liquid according to claim 1 , wherein the average particle size of the emulsified particles is from 100 nm to 250 nm.

10. When the inkjet treatment liquid was stored at 60° C. for 30 days, the average particle size X of the emulsified particles in the treatment liquid before storage and the average particle size Y of the emulsified particles in the treatment liquid after storage were determined based on the following formula: 1.0≦Y / X≦1.05 The inkjet post-treatment liquid according to claim 9 , which satisfies the above formula:

11. The inkjet post-treatment liquid according to any one of claims 1 to 10, which is for textile printing.

12. a recording head that ejects ink onto an image forming area of ​​a textile printing target, and a treatment head that ejects a post-treatment liquid onto at least the image forming area of ​​the textile printing target, The ink-jet printing apparatus, wherein the post-treatment liquid is the ink-jet post-treatment liquid according to any one of claims 1 to 10.

13. an ink ejection step of ejecting ink from a recording head onto an image forming area of ​​a textile printing target, and a processing step of ejecting a post-treatment liquid from a processing head onto at least the image forming area of ​​the textile printing target, The ink-jet printing method, wherein the post-treatment liquid is the ink-jet post-treatment liquid according to any one of claims 1 to 10.

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