Inkjet treatment liquid, inkjet textile printing device, and inkjet textile printing method

Abstract

SOLUTION: An inkjet treatment liquid contains emulsified particles containing a silicone oil, and an aqueous medium, wherein the average particle size of the emulsified particles is 100 nm to 250 nm.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a processing liquid for inkjet, an inkjet printing apparatus, and an inkjet printing method.

Background Art

[0002] In an inkjet printing method, for example, ink containing a pigment is used. In order to improve the rubbing fastness of a printing target (hereinafter sometimes referred to as a printed matter) on which an image is formed, the ink containing a pigment may be used together with a post-treatment liquid.

[0003] On the other hand, conventionally, a conveyance roller for an inkjet recording apparatus is known (see, for example, Patent Document 1). In the conveyance roller described in Patent Document 1, a processing liquid containing one or both of fullerene and a fullerene derivative is applied to the surface of the conveyance roller.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

[0005] The processing liquid for inkjet according to the first aspect of the present disclosure contains emulsified particles containing silicone oil and an aqueous medium, and the average particle diameter of the emulsified particles is 100 nm or more and 250 nm or less.

Brief Description of the Drawings

[0006] [Figure 1] FIG. 1 is a side view showing an example of an inkjet printing apparatus according to the second embodiment of the present disclosure.

Modes for Carrying Out the Invention

[0007] In recent years, there has been a growing demand for further improvements in the rubbing fastness of printed materials in inkjet textile printing technology. The rubbing fastness of printed materials is expected to vary depending on the concentration and type of silicone oil contained in the processing solution, as well as the discharge rate of the processing solution. For example, if the discharge rate of the processing solution is small, it is expected that if the concentration of silicone oil is too low, it may affect the rubbing fastness of the printed material. Therefore, it would be desirable to know the characteristics of an inkjet processing solution that can produce printed materials with excellent rubbing fastness from perspectives other than adjusting the concentration and selection of the type of silicone oil.

[0008] Here, it is assumed that the friction fastness of the printed material also changes depending on the average particle size of the emulsion particles containing silicone oil in the processing solution. For example, it is assumed that if the average particle size of the emulsion particles is small, it may affect the friction fastness of the printed material. Therefore, it would be preferable to know the characteristics of an inkjet processing solution that can produce printed materials with excellent friction fastness from the viewpoint of the average particle size of the emulsion particles in the processing solution.

[0009] Furthermore, if the average particle size of the emulsified particles in the processing solution is large, the meniscus may become unstable when the processing solution is ejected from the processing head of the inkjet printing device, potentially leading to poor ejection performance. Therefore, inkjet processing solutions are also required to have excellent ejection properties from the processing head. In addition, it is even preferable if the inkjet processing solution can also suppress the deterioration of the tactile feel of the printed material.

[0010] The inkjet processing solution disclosed herein can suppress the deterioration of the tactile feel of printed materials, produce printed materials with excellent friction fastness, and exhibit excellent ejection properties from the processing head of an inkjet printing apparatus.

[0011] Embodiments of this disclosure will be described below. In this specification, the median diameter (D) is used. 50 The measured values ​​for ) are the median diameter measured using a laser diffraction / scattering particle size distribution analyzer (LA-950, manufactured by Horiba, Ltd.), unless otherwise specified. Hereafter, the volume median diameter will be referred to as "D50 It may be stated as "[main component] of the material." Unless otherwise specified, the "main component" of the material means the component that is present in the greatest quantity by mass. Unless otherwise specified, "specific gravity" means the specific gravity at 25°C. Acrylic and methacrylic may be collectively referred to as "(meth)acrylic." Each component described herein may be used individually or in combination of two or more.

[0012] [First Embodiment: Inkjet Processing Solution] The following describes the inkjet processing solution (hereinafter also referred to as the processing solution) according to the first embodiment of this disclosure. The processing solution according to the first embodiment contains emulsion particles and an aqueous medium. The emulsion particles are dispersed in the aqueous medium of the processing solution. That is, the processing solution according to the first embodiment is an emulsion, and more specifically, an oil-in-water (O / W) type emulsion.

[0013] The processing solution according to the first embodiment is suitably used, for example, in an inkjet printing apparatus and an inkjet printing method described later. The processing solution according to the first embodiment is, for example, a processing solution for post-processing. Specifically, after an image is formed in the image-forming area of ​​the object to be printed with ink, the image-forming area is post-processed with the processing solution according to the first embodiment.

[0014] <Emulsified particles> The emulsion particles contained in the processing solution contain silicone oil. Preferably, the silicone oil contains at least ionic group-containing silicone oil. By including ionic group-containing silicone oil, it is possible to produce printed materials with particularly excellent wet friction fastness. The silicone oil may be a silicone oil other than ionic group-containing silicone oil (hereinafter sometimes referred to as "other silicone oil"). Alternatively, the silicone oil may contain both ionic group-containing silicone oil and other silicone oils. In this case, one emulsion particle may contain both ionic group-containing silicone oil and other silicone oils. Alternatively, there may be two or more types of emulsion particles contained in the processing solution, for example, the first emulsion particle may contain ionic group-containing silicone oil and the second emulsion particle may contain other silicone oils. The emulsion particles containing at least silicone oil, particularly ionic group-containing silicone oil, provide the following first to fourth advantages.

[0015] Let me explain the first advantage. Silicone oil has a friction-reducing effect. When the printing target is post-treated with the processing solution, the image formed on the printing target is coated with silicone oil, reducing the coefficient of friction of the surface of the printing target. As a result, even if the image formed on the printing target is rubbed, color fading is less likely to occur, and it is possible to produce printed materials with excellent dry and wet friction fastness. In addition, by being coated with silicone oil, which has a friction-reducing effect, friction between the threads of the printing target is reduced. As a result, stiffness of the printing target caused by image formation is reduced, and the deterioration of the tactile feel of the printed material is suppressed.

[0016] Let me explain the second advantage. Silicone oil is water-repellent. By post-treating the printing target with the processing solution, the printing target is coated with water-repellent silicone oil, imparting water repellency to the surface of the printing target. As a result, even when the image formed on the printing target is rubbed in a wet state, color fading is less likely to occur, and a printed material with excellent wet friction fastness can be produced.

[0017] Let me explain the third advantage. In particular, when at least an ionic group-containing silicone oil is included, it is presumed that the presence of ionic groups in the ionic group-containing silicone oil causes ionic bonds to be formed between the ionic groups and the object to be printed, and between the ionic groups and the ink discharged onto the object to be printed. Due to the formation of ionic bonds, the ionic group-containing silicone oil becomes less likely to be washed away from the object to be printed and the ink by water. As a result, printed materials with superior wet friction fastness can be produced.

[0018] Let me explain the fourth advantage. In particular, when the solution contains at least ionic group-containing silicone oil, the presence of ionic groups in the ionic group-containing silicone oil allows the emulsion particles containing the ionic group-containing silicone oil to disperse suitably in the aqueous medium of the processing solution. Such a processing solution can be more suitably discharged from the processing head of an inkjet printing apparatus. When the processing solution is discharged from the processing head, the amount of processing solution used is reduced compared to when the printing material is immersed in the processing solution. Therefore, stiffness is less likely to occur in the printing material, and the deterioration of the tactile feel of the printing material is further suppressed. In addition, when the processing solution is discharged from the processing head, a higher viscosity silicone oil can be used compared to when ink containing silicone oil as a base oil is discharged from the recording head. Therefore, printing materials with superior friction fastness can be produced. The first to fourth advantages have now been explained.

[0019] The silicone oil content in the processing solution is preferably 5% by mass or more and 15% by mass or less. A silicone oil content of 5% by mass or more further suppresses the deterioration of the tactile feel of the printed material and allows for the production of printed materials with superior friction fastness. A silicone oil content of 15% by mass or less allows for better discharge of the processing solution from the processing head of the inkjet printing apparatus. Furthermore, if the silicone oil contains at least ionic group-containing silicone oil, a silicone oil content of 15% by mass or less suppresses an excessive increase in the amount of ionic groups in the ionic group-containing silicone oil. As a result, it prevents difficulty in imparting appropriate water repellency to the surface of the printed material and suppresses a decrease in the friction fastness of the printed material. In particular, if the silicone oil content is within this concentration range, depending on the type of silicone oil, printed materials with superior friction fastness can be produced.

[0020] The silicone oil content in the processing solution is preferably 7% by mass or more, more preferably 9% by mass or more, and even more preferably 10% by mass or more. Furthermore, the silicone oil content in the processing solution is preferably 14% by mass or less, and more preferably 13% by mass or less. In particular, by keeping the silicone oil content in the processing solution within the range of 10% by mass or more and 13% by mass or less, it is possible to produce printed materials with superior dry and wet rubbing fastness.

[0021] The silicone oil content in the processing solution refers to the percentage of the mass of silicone oil relative to the mass of the processing solution. If the emulsified particles contain two or more types of silicone oil (e.g., ionic group-containing silicone oil and other silicone oils), the silicone oil content refers to the percentage of the total mass of the two or more types of silicone oil relative to the mass of the processing solution.

[0022] The viscosity of the silicone oil is 500 mm. 2 / s (i.e., mm 2It is preferably at least / second). When the viscosity of the silicone oil is 500 mm 2 / s or more, it becomes difficult for the silicone oil to detach from the printed matter due to friction, and a printed matter with excellent dry friction fastness and wet friction fastness can be produced. Further, as already described, the treatment liquid according to the first embodiment is excellent in dischargeability from the treatment head of the inkjet printing apparatus. When the treatment liquid is discharged from the treatment head, the amount of the treatment liquid used is reduced as compared with the case where the printed matter is immersed in the treatment liquid. Therefore, even when a silicone oil having a high viscosity of 500 mm 2 / s or more is used as the treatment liquid, roughness is hardly caused on the printing target, and a decrease in the tactile sensation of the printed matter is more suppressed.

[0023] The upper limit of the viscosity of the silicone oil is not particularly limited. The viscosity of the silicone oil is, for example, preferably 100000 mm 2 / s or less, and preferably 6000 mm 2 / s or less. The viscosity of the silicone oil is, for example, 500 mm 2 / s, 700 mm 2 / s, 900 mm 2 / s, 1000 mm 2 / s, 1100 mm 2 / s, 1200 mm 2 / s, 1500 mm 2 / s, 1700 mm 2 / s, 1800 mm 2 / s, 2000 mm 2 / s, 3000 mm 2 / s, 5700 mm 2 / s, and may be within the range of two values selected from the group consisting of 6000 mm 2 / s.

[0024] The viscosity of the silicone oil means the kinematic viscosity at 25°C. When the emulsion particles contain two or more types of silicone oils (for example, an ionic group-containing silicone oil and other silicone oils), the viscosity of the silicone oil means the viscosity of a mixture of two or more types of silicone oils.

[0025] The viscosity of silicone oil is measured in accordance with the method described in JIS (Japanese Industrial Standards) Z8803:2011 (Method for measuring the viscosity of liquids). For example, the viscosity of silicone oil can be measured by separating it from the processing solution by extracting it with toluene, washing it, and drying it.

[0026] The average particle size of the emulsion particles (dispersed particle size in an aqueous medium) is between 100 nm and 250 nm. By having an average particle size of emulsion particles between 100 nm and 250 nm, the inkjet processing solution according to this first embodiment suppresses the deterioration of the tactile feel of the printed material, produces printed materials with excellent friction fastness, and exhibits excellent ejection performance from the processing head of the inkjet printing apparatus.

[0027] Specifically, if the average particle size of the emulsion particles is less than 100 nm, the friction fastness of the printed material, especially the wet friction fastness, decreases significantly. This is thought to be because if the particle size of the emulsion particles is too small, the specific surface area of ​​the processing solution increases, which in turn increases its hydrophilicity and decreases its water resistance. On the other hand, if the average particle size of the emulsion particles exceeds 250 nm, the discharge performance of the processing solution from the processing head deteriorates significantly.

[0028] Furthermore, the average particle diameter of the emulsion particles is preferably between 100 nm and 160 nm. Alternatively, the average particle diameter of the emulsion particles may be within the range of two values ​​selected from the group consisting of, for example, 100 nm, 105 nm, 110 nm, 115 nm, 120 nm, 125 nm, 130 nm, 135 nm, 140 nm, 145 nm, 150 nm, 155 nm, 160 nm, 170 nm, 180 nm, 190 nm, 200 nm, 210 nm, 220 nm, and 250 nm.

[0029] In this specification, when a processing solution contains two or more types of emulsified particles with different average particle diameters, "the average particle diameter of the emulsified particles is within a specific range" basically means "the average particle diameter of the two or more types of emulsified particles (the combined average particle diameter of the two or more types of emulsified particles) is within a specific range." However, when a processing solution contains two or more types of emulsified particles with different average particle diameters in this way, it is preferable that the average particle diameter of each emulsified particle is between 100 nm and 250 nm. Furthermore, it is more preferable that the difference between the average particle diameters of each emulsified particle is smaller. For example, when a processing solution contains two types of emulsified particles with different average particle diameters, it is preferable that the average particle diameters of both emulsified particles are closer to each other. For example, it is preferable that the average particle diameters of the two different types of emulsified particles are both within the range of 100 nm to 160 nm.

[0030] More specifically, when the processing solution contains first emulsion particles and second emulsion particles having a different average particle diameter from the first emulsion particles, it is preferable that the flat particle diameter of the first emulsion particles is 100 nm to 250 nm, and the average particle diameter of the second emulsion particles is 100 nm to 250 nm. It is even more preferable that the average particle diameter of the first emulsion particles is 100 nm to 160 nm, and the average particle diameter of the second emulsion particles is 100 nm to 160 nm. Furthermore, it is even more preferable that the difference between the average particle diameter of the first emulsion particles and the average particle diameter of the second emulsion particles is 0 nm to 30 nm.

[0031] The average particle size of emulsified particles refers to the harmonic mean particle size (also called the cumulant mean particle size) calculated based on scattered light intensity using the cumulant method. The average particle size of emulsified particles is measured in accordance with the method described in ISO 13321:1996 (Particle size analysis - Photon correlation spectroscopy).

[0032] Furthermore, the emulsified particles may contain components other than silicone oil. However, if the emulsified particles contain only silicone oil, it is possible to more reliably produce printed materials with excellent friction fastness and to more reliably suppress the deterioration of the tactile feel of the printed materials.

[0033] As already mentioned, the silicone oil contained in the emulsion particles may be one of the following: an ionic group-containing silicone oil or another type of silicone oil. Alternatively, the silicone oil may contain both an ionic group-containing silicone oil and another type of silicone oil. In this case, one emulsion particle may contain both an ionic group-containing silicone oil and another type of silicone oil. Or, the first emulsion particle may contain an ionic group-containing silicone oil, and the second emulsion particle may contain another type of silicone oil. The ionic group-containing silicone oil and other types of silicone oil will be described below.

[0034] (Ionic group-containing silicone oil) Silicone oils containing ionic groups are modified silicone oils, and more specifically, ionic group-modified silicone oils. Examples of ionic group-modified silicone oils include modified silicone oils in which ionic groups are introduced into the side chains, and modified silicone oils in which ionic groups are introduced into the terminal groups.

[0035] Modified silicone oils in which ionic groups are introduced into the side chains have a first terminal group represented by the following formula (1a), a repeating unit represented by the following formula (1b), a repeating unit represented by the following formula (1c), and a second terminal group represented by the following formula (1d).

[0036] [ka]

[0037] In formula (1a), * indicates a bond to a silicon atom in the repeating unit represented by formula (1b) or (1c). In formula (1d), * indicates a bond to an oxygen atom in the repeating unit represented by formula (1b) or (1c). In formula (1c), R 1 The symbol represents a group containing an ionic group. Preferred ionic groups include amino groups, carboxyl groups, phenolic hydroxyl groups, or silanol groups.

[0038] A modified silicone oil in which an ionic group is introduced to the terminal group has a first terminal group represented by the following formula (2a), a repeating unit represented by the following formula (2b), and a second terminal group represented by the following formula (2c).

[0039] [ka]

[0040] In formula (2a), * indicates a bond to the silicon atom in the repeating unit represented by formula (2b). In formula (2c), * indicates a bond to the oxygen atom in the repeating unit represented by formula (2b). In formula (2a), R 2 , and R in equation (2c) 3 Each of these independently represents a group containing an ionic group. Preferred ionic groups include amino groups, carboxyl groups, phenolic hydroxyl groups, or silanol groups.

[0041] The ionic group-containing silicone oil preferably contains at least one selected from the group consisting of amino-modified silicone oil, carboxy-modified silicone oil, phenol-modified silicone oil, and silanol-modified silicone oil. Furthermore, it is more preferable that the ionic group-containing silicone oil is at least one selected from the group consisting of these. Moreover, it is more preferable that the ionic group-containing silicone oil is one of these. Amino-modified silicone oil, carboxy-modified silicone oil, phenol-modified silicone oil, and silanol-modified silicone oil each have an amino group, a carboxyl group, a phenolic hydroxyl group, and a silanol group as ionic groups, respectively. Of these, the ionic group-containing silicone oil is more preferably a carboxy-modified silicone oil.

[0042] When the silicone oil contains at least an ionic group-containing silicone oil, the functional group equivalent of the ionic group-containing silicone oil is preferably 1000 g / mol or more and 5500 g / mol or less in order to more favorably disperse the emulsion particles in the aqueous medium. The functional group equivalent is the molecular weight per 1 mole of functional group (ionic group). The functional group equivalent of the ionic group-containing silicone oil may be within the range of two values ​​selected from the group consisting of, for example, 1000 g / mol, 1200 g / mol, 1474 g / mol, 1490 g / mol, 1500 g / mol, 2000 g / mol, 3800 g / mol, 3900 g / mol, 4000 g / mol, 5000 g / mol, 5200 g / mol, and 5500 g / mol.

[0043] When the silicone oil contains at least an ionic group-containing silicone oil, the content of the ionic group-containing silicone oil relative to the total mass of silicone oil contained in the emulsion particles is preferably 30% by mass or more and 100% by mass or less, more preferably 40% by mass or more and 100% by mass or less, and particularly preferably 100% by mass.

[0044] (Other silicone oils) The silicone oil contained in the processing solution may consist solely of other silicone oils. Alternatively, the viscosity of the silicone oil can be adjusted by further including other silicone oils in addition to the ionic group-containing silicone oil. Examples of other silicone oils include unmodified silicone oils. More specifically, dimethylpolysiloxane is an example.

[0045] If other silicone oils are included, the content of the other silicone oils relative to the total mass of silicone oils contained in the emulsion particles is preferably 50% by mass or more and 100% by mass or less, more preferably 50% by mass or more and 70% by mass or less, and even more preferably 50% by mass or more and 60% by mass or less.

[0046] When the silicone oil contained in the processing solution contains both ionic group-containing silicone oil and other silicone oils, the silicone oil is preferably a combination of carboxy-modified silicone oil and dimethylpolysiloxane. In this case, one emulsion particle may contain both carboxy-modified silicone oil and dimethylpolysiloxane. Alternatively, the first emulsion particle may contain carboxy-modified silicone oil, and another emulsion particle, the second emulsion particle, may contain dimethylpolysiloxane.

[0047] When the silicone oil contained in the processing solution contains both ionic group-containing silicone oil and other silicone oils, the ratio of the mass of the ionic group-containing silicone oil to the mass of the other silicone oil is preferably 0.5 or more and less than 1.0, and more preferably 0.6 or more and 0.7 or less.

[0048] <Aqueous medium> The aqueous medium contained in the processing solution is a medium whose main component is water. The aqueous medium may function as a solvent or as a dispersion medium. Specific examples of the aqueous medium include water or 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 water content 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, relative to the mass of the processing solution.

[0049] <Other ingredients> The processing solution may, if necessary, contain components other than emulsified particles and aqueous media (hereinafter sometimes referred to as "other components"). Examples of other components include acids, bases, polyols, and dispersants.

[0050] (acid) If the silicone oil contains at least an ionic group-containing silicone oil, and the ionic group-containing silicone oil has anionic groups, it is preferable that the treatment solution contains an acid. The acid promotes the ionization of the anionic groups, and the emulsion particles containing the ionic group-containing silicone oil are suitably dispersed in the aqueous medium. Examples of acids include strong acids and weak acids. Examples of strong acids include hydrochloric acid, p-toluenesulfonic acid, and sulfuric acid. Examples of weak acids include benzoic acid and acetic acid. To promote the ionization of the anionic groups of the silicone oil, a strong acid is preferred. Specifically, hydrochloric acid, p-toluenesulfonic acid, or sulfuric acid are more preferred. When the treatment solution contains an acid, the acid content, converted to the amount of acid at a concentration of 1 mol / L, is preferably 1% by mass or more and 5% by mass or less relative to the mass of the treatment solution.

[0051] (base) If the silicone oil contains at least an ionic group-containing silicone oil, and the ionic group-containing silicone oil has cationic groups, it is preferable that the treatment solution contains a base. The base promotes the ionization of the cationic groups, and the emulsion particles containing the ionic group-containing silicone oil are suitably dispersed in the aqueous medium. Examples of bases include sodium hydroxide. When the treatment solution contains a base, it is preferable that the base content, converted to the amount of base at a concentration of 1 mol / L, is 1% by mass or more and 5% by mass or less relative to the mass of the treatment solution.

[0052] (Polyol) The viscosity of the treatment solution is suitably adjusted by including a polyol in the treatment solution. Diols or triols are preferred as polyols. Examples of diols include glycol compounds. More specifically, examples include ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, and tetraethylene glycol. Examples of triols include glycerin. When the treatment solution contains a polyol, the polyol content is preferably 10% to 40% by mass, and more preferably 15% to 35% by mass, relative to the mass of the treatment solution.

[0053] (Dispersant) Examples of dispersants include surfactants, resin dispersants, and polysaccharides. However, it is preferable that the emulsion particles are dispersed in the treatment solution without the treatment solution containing a dispersant. As already mentioned, emulsion particles containing silicone oil, particularly ionic group-containing silicone oil, disperse more favorably in aqueous media. Therefore, even if a dispersant is not included, the dispersion state of the emulsion particles can be favorably maintained. Dispersants often have hydrophilic groups. By not including a dispersant with hydrophilic groups in the treatment solution, the wet rubbing fastness of the printed material treated with the treatment solution is further improved.

[0054] <Method for producing the treatment solution> An example of a method for producing the treatment solution is described below. Using a homogenizer, silicone oil, an aqueous medium, and components added as needed (e.g., an acid or base, and a polyol) are mixed and emulsified. In this way, emulsion particles containing silicone oil are dispersed in the aqueous medium to obtain the treatment solution.

[0055] To facilitate emulsification, a raw material emulsion containing emulsification particles may be prepared in advance, and the raw material emulsion, an aqueous medium, and a polyol as needed may be mixed to obtain the processing solution. The raw material emulsion may contain, for example, silicone oil, a portion of the aqueous medium, and an acid or base as needed. In the preparation of the raw material emulsion, the emulsification time is, for example, 5 minutes to 1 hour. The emulsification temperature is, for example, 5°C to 40°C. The content of the raw material emulsion is, for example, 15% to 50% by mass relative to the mass of the processing solution.

[0056] Furthermore, when using two or more types of silicone oils, for example, both ionic group-containing silicone oil and non-modified silicone oil, as raw materials, the two silicone oils may be mixed and emulsified to produce emulsion particles containing both ionic group-containing silicone oil and non-modified silicone oil, thereby obtaining the processing solution. Alternatively, by mixing the raw material emulsion of ionic group-containing silicone oil and the raw material emulsion of non-modified silicone oil, a processing solution may be obtained in which first emulsion particles containing ionic group-containing silicone oil and another second emulsion particles containing non-modified silicone oil are mixed.

[0057] The method for adjusting the average particle size of the emulsion particles contained in the processing solution to a range of 100 nm to 250 nm is not particularly limited, but for example, an appropriately adjusted amount of surfactant can be added and mixed during the preparation of the processing solution or raw material emulsion. Specifically, the average particle size of the emulsion particles can be made smaller by increasing the amount of surfactant added. Examples of surfactants include polyoxyethylene alkyl ethers.

[0058] [Second Embodiment: Inkjet Printing Apparatus] Next, an inkjet printing apparatus 10 according to the second embodiment of this disclosure will be described with reference to Figure 1. For ease of understanding, Figure 1 schematically shows each component. The size, number, etc. of each component shown may be changed as appropriate. Figure 1 is a side view showing the main parts of an inkjet printing apparatus 10, which is an example of an inkjet printing apparatus according to the second embodiment. The inkjet printing apparatus 10 shown in Figure 1 is a flatbed type inkjet printing apparatus.

[0059] The inkjet printing apparatus 10 according to the second embodiment processes the object to be printed P using the processing solution according to the first embodiment. Because the processing solution according to the first embodiment is used, for the same reasons as described in the first embodiment, the inkjet printing apparatus 10 can produce printed materials with excellent friction fastness and suppress a decrease in the tactile feel of the printed materials. Furthermore, because the processing solution according to the first embodiment has excellent discharge properties from the processing head, the inkjet printing apparatus according to this second embodiment can reliably achieve these effects.

[0060] The inkjet printing apparatus 10 shown in Figure 1 comprises 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.

[0061] The recording head 1 ejects ink onto the image forming area of ​​the print target P. The first recording head 1a, second recording head 1b, third recording head 1c, and fourth recording head 1d of the recording head 1 each eject ink of a different color (for example, yellow ink, magenta ink, cyan ink, and black ink). The recording head 1 is not particularly limited, but examples include a piezo type head and a thermal inkjet type head.

[0062] The processing head 2 discharges a processing solution onto at least the image-forming region of the printing target P. The processing solution is the processing solution according to the first embodiment. The processing head 2 is not particularly limited, but examples include a piezo type head and a thermal inkjet type head.

[0063] The printing target P is placed on the mounting table 3. A recording head 1 and a processing head 2 are positioned above the mounting table 3 so that ink and processing liquid can be dispensed onto the printing target P. Driven by a motor (not shown), the mounting table 3 moves horizontally in the direction from the recording head 1 to the processing head 2 (for example, to the left in Figure 1). As the mounting table 3 moves horizontally, the printing target P on the mounting table 3 is transported.

[0064] The fabric to be printed P may be woven or knitted. Examples of fabrics to be printed P include cotton, silk, linen, acetate, rayon, nylon, polyurethane, and polyester.

[0065] In the preparation of a printed material, first, the mounting platform 3 on which the material to be printed P is placed moves horizontally, and the material to be printed P is transported to a position facing the recording head 1. Ink is ejected from the recording head 1 into the image forming area of ​​the material to be printed P. In this way, an image is formed on the image forming area of ​​the material to be printed P by the ink. After the ink is ejected, the mounting platform 3 on which the material to be printed P is placed moves horizontally again, and the material to be printed P is transported to a position facing the processing head 2. Processing liquid is ejected from the processing head 2 into at least the image forming area of ​​the material to be printed P. In this way, a processing film is formed on the image formed on the image forming area of ​​the material to be printed P by the processing liquid.

[0066] The processing head 2 may dispense the processing liquid only to the image-forming area of ​​the print target P. Alternatively, the processing head 2 may dispense the processing liquid over an area wider than the image-forming area of ​​the print target P, or it may dispense the processing liquid over the entire surface of the print target P. To reduce the amount of processing liquid used and suppress the deterioration of the tactile feel of the printed material, it is preferable for the processing head 2 to dispense the processing liquid only to the image-forming area of ​​the print target P. Furthermore, for the same reason, it is even more preferable for the processing head 2 to dispense the processing liquid only to the area within the image-forming area where ink has been dispensed by the recording head 1. Since the processing head 2 can accurately control the position where the processing liquid is dispensed, it is possible to dispense the processing liquid only to the area where ink has been dispensed. In order to accurately control the position where the processing liquid is dispensed, it is preferable that the distance between the processing head 2 and the print target P is 1 mm or more and 5 mm or less. In addition, in order to efficiently carry out post-processing with the processing liquid, it is preferable that only the processing liquid is dispensed from the processing head 2.

[0067] After the processing liquid is discharged from the processing head 2 to the printing target P, the mounting table 3 on which the printing target P is placed moves horizontally further to transport the printing target P to a position facing the heating unit (not shown). The heating unit heats the printing target P, drying the ink and processing liquid. The heating temperature is, for example, between 120°C and 180°C. The heating time is, for example, between 1 minute and 10 minutes. Heating causes volatile components contained in the ink and processing liquid to evaporate, promoting the fixation of the ink and processing liquid to the printing target P. As a result, a printed product is produced in which an image is formed by the ink and the printing target P is processed by the processing liquid.

[0068] The inkjet printing apparatus 10 according to the second embodiment has been described above. However, the inkjet printing apparatus of this disclosure is not limited to the inkjet printing apparatus 10 described above, and can be modified as shown in the following modifications, for example.

[0069] Regarding the first modification, the inkjet printing apparatus 10 may be equipped with a spray for dispensing the processing liquid instead of a processing head 2 for ejecting the processing liquid.

[0070] Regarding the second modification, the treatment with the treatment solution may be carried out by immersing the object to be printed P in a tank in which the treatment solution is stored. When immersion is performed, the amount of treatment solution discharged, as described later in the third embodiment, corresponds to the amount of treatment solution applied.

[0071] Regarding the third modification, in the above-described embodiment, the mounting base 3 moved horizontally, but the recording head 1 and processing head 2 may move horizontally while the mounting base 3 is fixed.

[0072] Regarding the fourth modification, the mounting table 3 may move horizontally in the transport direction of the object to be printed P, or the recording head 1 and processing head 2 may move horizontally, and the recording head 1 and processing head 2 may also move horizontally in a direction perpendicular to the transport direction of the object to be printed P.

[0073] Regarding the fifth modified example, the number of recording heads 1 may be 1 to 3 or 5 or more.

[0074] Regarding the sixth modification, the inkjet printing apparatus may not be a flatbed type. As long as it is equipped with a recording head 1 and a processing head 2, the effects of using the processing liquid according to the first embodiment can be obtained regardless of the type of inkjet printing apparatus.

[0075] [Third Embodiment: Inkjet Printing Method] Next, with reference to Figure 1, an inkjet printing method according to the third embodiment of this disclosure will be described. The inkjet printing method according to the third embodiment uses the processing liquid according to the first embodiment to form an image in the image-forming area of ​​the printing target P. Furthermore, the inkjet printing method according to the third embodiment uses the inkjet printing apparatus 10 according to the second embodiment to form an image in the image-forming area of ​​the printing target P. Because the inkjet printing method according to the third embodiment uses the processing liquid according to the first embodiment, for the same reasons as described in the first embodiment, it is possible to produce a printed material with excellent friction fastness and suppress a decrease in the tactile feel of the printed material. Moreover, since the processing liquid according to the first embodiment has excellent discharge properties from the processing head, these effects can be reliably achieved with the inkjet printing method according to the third embodiment.

[0076] The inkjet printing method according to the third embodiment includes an ink ejection step and a processing step. In the ink ejection step, ink is ejected from the recording head 1 onto the image forming area of ​​the printing target P. In the processing step, a processing liquid is ejected from the processing head 2 onto at least the image forming area of ​​the printing target P. The processing liquid is the processing liquid according to the first embodiment. The processing step is performed, for example, after the ink ejection step. The inkjet printing method may further include a heating step as needed.

[0077] In the ink ejection process, the amount of ink ejected to the printing target P is, for example, 5 g / m². 2 More than 40g / m 2 The following applies:

[0078] In the processing step, the amount of processing solution discharged to the object to be printed P is, for example, 10 g / m². 2 More than 120g / m 2 The following applies (including when applied by coating): To particularly improve dry friction fastness, the discharge rate of the treatment solution is 15 g / m². 2 More than 30g / m 2 Preferably, the following conditions apply: In order to particularly improve wet friction fastness in addition to dry friction fastness, the discharge rate of the treatment solution is 17 g / m². 2More than 25g / m 2 The following is more preferable. The inkjet printing method according to the third embodiment has been described above with reference to Figure 1.

[0079] [Inks used in the second and third embodiments] Next, the inks used in the second and third embodiments described above will be explained. The inks include, for example, a pigment and an aqueous medium. The inks may further contain, if necessary, at least one selected from the group consisting of surfactants, polyols, and binder resin particles.

[0080] (Pigment) Pigments exist dispersed in an aqueous medium, for example. From the viewpoint of obtaining an ink with excellent image density, hue, and color stability, the D of the pigment 50 The wavelength is preferably between 30 nm and 250 nm, and more preferably between 70 nm and 160 nm.

[0081] Examples of pigments include yellow, orange, red, blue, purple, 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).

[0082] The pigment content is preferably 1% to 12% by mass, and more preferably 1% to 7% by mass, relative to the mass of the ink. A pigment content of 1% by mass or more improves the image density of the printed material. Furthermore, a pigment content of 12% by mass or less yields an ink with high fluidity.

[0083] (aqueous medium) The aqueous medium contained in the ink is the same as the aqueous medium contained in the processing solution described in the first embodiment. The content of the aqueous medium is preferably 5% by mass or more and 70% by mass or less, and more preferably 40% by mass or more and 60% by mass or less, relative to the mass of the ink.

[0084] (Surfactants) The inclusion of a surfactant in the ink improves the wettability of the ink to the printing surface. 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 acetylenediol 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 can be calculated, for example, by the Griffin method using the formula "HLB value = 20 × (sum of formula weights of hydrophilic parts) / molecular weight". In order to improve image density while suppressing image offset, the surfactant content is preferably 0.1% to 5.0% by mass, and more preferably 0.5% to 2.0% by mass, relative to the mass of the ink.

[0085] (Polyol) The viscosity of the ink is suitably adjusted by the inclusion of a polyol. The polyol contained in the ink is the same as the polyol contained in the processing solution described in the first embodiment. When the ink contains a polyol, in order to suitably adjust the viscosity of the ink, the polyol content is preferably 5% by mass or more and 60% by mass or less, and more preferably 20% by mass or more and 50% by mass or less, relative to the mass of the ink.

[0086] (Binder resin particles) Binder resin particles exist dispersed in an aqueous medium. These particles function as a binder, binding the printing target and the pigment. Therefore, by including binder resin particles in the ink, it is possible to obtain printed materials with excellent pigment fixation.

[0087] Examples of resins 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. Urethane resin is preferred as the resin contained in the binder resin particles. The content of urethane resin in the binder resin particles is preferably 80% by mass or more, and more preferably 100% by mass.

[0088] The binder resin content is preferably 1% to 20% by mass, and more preferably 2% to 10% by mass, relative to the mass of the ink. When the binder resin particle content is 1% by mass or more, a printing target with excellent pigment fixation can be obtained. On the other hand, when the binder resin particle content is 20% by mass or less, the ink can be stably dispensed onto the printing target.

[0089] (Additives) The ink may further contain known additives as needed (more specifically, dissolution stabilizers, drying inhibitors, antioxidants, viscosity modifiers, pH adjusters, and fungicides).

[0090] (Ink manufacturing method) Ink is manufactured, for example, by mixing pigment, an aqueous medium, and optionally added components (e.g., surfactants, polyols, and binder resin particles) using a stirrer. The mixing time is, for example, between 1 minute and 30 minutes.

[0091] [Summary of this disclosure] The inkjet processing solution relating to the first aspect of this disclosure contains an emulsion of silicone oil-containing particles and an aqueous medium. The average particle size of the emulsified particles is between 100 nm and 250 nm.

[0092] This inkjet processing solution suppresses the deterioration of the tactile feel of printed materials, enables the production of printed materials with excellent friction fastness, and provides excellent ejection from the processing head of an inkjet printing machine.

[0093] In the inkjet processing solution described above, the average particle size of the emulsion particles may be 100 nm or more and 160 nm or less.

[0094] This configuration allows the inkjet processing solution to exhibit superior ejection from the processing head.

[0095] In the aforementioned inkjet processing solution, the emulsion particles include first emulsion particles and second emulsion particles having a different average particle size from the first emulsion particles. The average particle size of the first emulsion particles is between 100 nm and 250 nm. The average particle size of the second emulsion particles may be between 100 nm and 250 nm.

[0096] With this configuration, even when two or more emulsified particles with different average particle sizes are included, the aforementioned effects of suppressing the deterioration of tactile feel on the printed material, excellent friction fastness, and discharge performance can be reliably achieved.

[0097] In the above-mentioned inkjet processing solution, the average particle size of the first emulsion particles is 100 nm or more and 160 nm or less. The average particle size of the second emulsion particles may be 100 nm or more and 160 nm or less.

[0098] With this configuration, even when two or more emulsified particles with different average particle sizes are included, the aforementioned effects of suppressing the deterioration of tactile feel on the printed material, the effect of excellent friction fastness, and the effect of discharge performance can be more reliably achieved.

[0099] In the above-described inkjet processing solution, the difference between the average particle diameter of the first emulsion particles and the average particle diameter of the second emulsion particles may be 0 nm or more and 30 nm or less.

[0100] With this configuration, even when two or more emulsified particles with different average particle sizes are included, the aforementioned effects of suppressing the deterioration of tactile feel on the printed material, the effect of excellent friction fastness, and the effect of discharge performance can be more reliably achieved.

[0101] In the aforementioned inkjet processing solution, the silicone oil may contain at least an ionic group-containing silicone oil.

[0102] By including at least an ionic group-containing silicone oil, it is possible to produce printed materials with superior wet friction fastness.

[0103] The aforementioned inkjet processing solution may also be used for textile printing.

[0104] By using the aforementioned inkjet processing solution for textile printing, the effects of suppressing the deterioration of tactile feel and achieving excellent friction fastness on the printed material can be more effectively demonstrated.

[0105] An inkjet printing apparatus according to the second aspect of this disclosure comprises a recording head that ejects ink onto an image forming area of ​​a printing target, and a processing head that ejects a processing liquid onto at least the image forming area of ​​the printing target, The aforementioned processing solution is an inkjet processing solution relating to the first aspect of this disclosure.

[0106] Because this inkjet printing apparatus uses the inkjet processing liquid according to the first aspect of this disclosure, it is possible to produce printed materials with suppressed deterioration of tactile feel and printed materials with excellent friction fastness. Furthermore, because the inkjet processing liquid has excellent discharge properties from the processing head, the effects of the inkjet processing liquid according to the first aspect of this disclosure on the printed materials can be reliably exerted.

[0107] An inkjet printing method relating to the third aspect of this disclosure includes an ink ejection step of ejecting ink from a recording head onto an image forming area of ​​a printing target, and a processing step of ejecting a processing liquid from a processing head onto at least the image forming area of ​​the printing target, The aforementioned processing solution is an inkjet processing solution relating to the first aspect of this disclosure.

[0108] Because this inkjet printing method uses the inkjet processing solution according to the first aspect of this disclosure, it is possible to produce printed materials with suppressed deterioration of tactile feel and with excellent friction fastness. Furthermore, since the inkjet processing solution has excellent discharge properties from the processing head, the effects of the inkjet processing solution according to the first aspect of this disclosure on the printed material can be reliably exerted. [Examples]

[0109] The present disclosure will be further described below with reference to examples, but the present disclosure is not limited in any way by these examples.

[0110] In this example, various printed materials were prepared by changing the type and content of silicone oil in the inkjet processing solution, the average particle size of the emulsion particles, and the discharge volume of the processing solution, and the suppression of the reduction in friction fastness and tactile feel of the printed materials was evaluated. Furthermore, in this example, the discharge performance of the processing solution from the nozzle was also evaluated according to the average particle size of the silicone oil emulsion particles in the inkjet processing solution.

[0111] 1. Evaluation test to suppress the decrease in friction fastness and tactile feel of printed materials when the type of processing solution (type and content of silicone oil in the processing solution and the average particle size of emulsion particles) is changed. In this test, the discharge rate of the processing solution during the preparation of printed materials was 20 g / m². 2 The settings were adjusted, and various printed materials were prepared while varying the type and concentration of silicone oil in the processing solution and the average particle size of the emulsion particles. Subsequently, the reduction in friction fastness and tactile feel of the prepared printed materials was evaluated.

[0112] [Method for preparing the treatment solution] The treatment solutions (A-1) to (A-7) and (B-1) used in this evaluation test were prepared by the method described below. The silicone oil content was calculated by rounding to the first decimal place.

[0113] <Preparation of treatment solution (A-1)> First, raw material emulsion A, which is contained in the processing solution (A-1), was prepared. Specifically, 300g of amino-modified silicone oil (Shin-Etsu Chemical Co., Ltd. "KF-864", viscosity: 1,700mm²) was used. 2600 g of deionized water and 100 g of hydrochloric acid (concentration: 1 mol / L) 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 then allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120-mesh stainless steel filter to obtain raw material emulsion A. Emulsified particles of amino-modified silicone oil were dispersed in raw material emulsion A. The average particle size of the emulsion particles contained in raw material emulsion A was 150 nm.

[0114] Next, treatment solution (A-1) was prepared using raw material emulsion A prepared as described above. Specifically, 33.30 g of raw material emulsion A (amino-modified silicone oil content: 30% by mass, amino-modified silicone oil content: 9.99 g), 33.35 g of deionized water, and 33.35 g of propylene glycol were mixed to obtain treatment solution (A-1). In treatment solution (A-1), the amino-modified silicone oil content was 10% by mass.

[0115] <Preparation of treatment solution (A-2)> For the preparation of treatment solution (A-3), the raw material emulsion A prepared as described above was used. Specifically, 15.00 g of raw material emulsion A (amino-modified silicone oil content: 30% by mass, amino-modified silicone oil content: 4.50 g), 50.00 g of deionized water, and 35.00 g of propylene glycol were mixed to obtain treatment solution (A-2). In treatment solution (A-2), the amino-modified silicone oil content was 5% by mass.

[0116] <Preparation of treatment solution (A-3)> For the preparation of treatment solution (A-3), the raw material emulsion A prepared as described above was used. Specifically, 50.00 g of raw material emulsion A (amino-modified silicone oil content: 30% by mass, amino-modified silicone oil content: 15.00 g), 35.00 g of deionized water, and 15.00 g of propylene glycol were mixed to obtain treatment solution (A-3). In treatment solution (A-3), the amino-modified silicone oil content was 15% by mass.

[0117] <Preparation of treatment solution (A-4)> First, raw material emulsion B, which is contained in the processing solution (A-4), was prepared. Specifically, 300g of carboxy-modified silicone oil (Shin-Etsu Chemical Co., Ltd. "X-22-3701E", viscosity: 2,000mm) was used. 2 600 g of deionized water (600 g / mol, specific gravity: 0.98, functional group equivalent: 4,000 g / mol) and 100 g of sodium hydroxide aqueous solution (concentration: 1 mol / L) 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 then allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120-mesh stainless steel filter to obtain raw material emulsion B. Emulsified particles of carboxy-modified silicone oil were dispersed in raw material emulsion B. The average particle size of the emulsion particles contained in raw material emulsion B was 120 nm.

[0118] Next, treatment solution (A-4) was prepared using raw material emulsion B prepared as described above. Specifically, treatment solution (A-4) was obtained in the same manner as treatment solution (A-1), except that raw material emulsion A (amino-modified silicone oil content: 30% by mass) was changed to raw material emulsion B (carboxy-modified silicone oil content: 30% by mass). In treatment solution (A-4), the carboxy-modified silicone oil content was 10% by mass.

[0119] <Preparation of treatment solution (A-5)> First, raw material emulsion C, which is contained in the processing solution (A-5), was prepared. Specifically, 300g of amino-modified silicone oil (Shin-Etsu Chemical Co., Ltd. "KF-877", viscosity: 5,700mm²) was used. 2 600 g of deionized water and 100 g of hydrochloric acid (concentration: 1 mol / L) 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 then allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120-mesh stainless steel filter to obtain raw material emulsion C. Emulsified particles of amino-modified silicone oil were dispersed in raw material emulsion C. The average particle size of the emulsion particles contained in raw material emulsion C was 200 nm.

[0120] Next, treatment solution (A-5) was prepared using raw material emulsion C prepared as described above. Specifically, treatment solution (A-5) was obtained in the same manner as treatment solution (A-1), except that raw material emulsion A (amino-modified silicone oil content: 30% by mass) was changed to raw material emulsion C (amino-modified silicone oil content: 30% by mass). In treatment solution (A-5), the amino-modified silicone oil content was 10% by mass.

[0121] <Preparation of treatment solution (A-6)> First, raw material emulsion D, which is contained in the processing solution (A-6), was prepared. Specifically, 180g of unmodified silicone oil (specifically dimethylpolysiloxane) (Shin-Etsu Chemical Co., Ltd. "KF96-3000cs", viscosity: 3,000mm) was used. 2 (L / s, specific gravity: 0.97), and 120 g of phenol-modified silicone oil (Shin-Etsu Chemical Co., Ltd. "KF2201", viscosity: 97 m / s). 2 Mix (s, specific gravity: 0.99, functional group equivalent: 1,474 g / mol) and adjust viscosity to 1,000 mm². 2A mixture MD was obtained at a concentration of / s. 300 g of mixture MD, 600 g of deionized water, and 100 g of sodium hydroxide aqueous solution (concentration 1 mol / L) 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 then allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120-mesh stainless steel filter to obtain raw material emulsion D. Emulsion D contained dispersed emulsion particles containing unmodified silicone oil and phenol-modified silicone oil. The average particle size of the emulsion particles contained in raw material emulsion D was 160 nm.

[0122] Next, treatment solution (A-6) was prepared using raw material emulsion D prepared as described above. Specifically, treatment solution (A-6) was obtained in the same manner as treatment solution (A-1), except that raw material emulsion A (content of amino-modified silicone oil: 30% by mass) was changed to raw material emulsion D (content of a mixture of phenol-modified silicone oil and unmodified silicone oil: 30% by mass). In treatment solution (A-6), the content of the mixture of phenol-modified silicone oil and unmodified silicone oil was 10% by mass.

[0123] <Preparation of treatment solution (A-7)> First, the raw material emulsion E contained in the processing solution (A-7) was prepared. Specifically, 180g of unmodified silicone oil (Shin-Etsu Chemical Co., Ltd. "KF96-3000cs", viscosity: 3,000mm) was used. 2 (L / s, specific gravity: 0.97), and 120 g of silanol-modified silicone oil (Shin-Etsu Chemical Co., Ltd. "KF9701", viscosity: 60 mm²). 2 Mix ( / s, specific gravity: 0.977, functional group equivalent: 1,500 g / mol) to a viscosity of 1,200 mm². 2A mixture ME was obtained at a concentration of / s. 300 g of mixture ME, 600 g of deionized water, and 100 g of sodium hydroxide aqueous solution (concentration 1 mol / L) 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 then allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120-mesh stainless steel filter to obtain the raw material emulsion E. Emulsion E contained dispersed emulsion particles containing unmodified silicone oil and silanol-modified silicone oil. The average particle size of the emulsion particles contained in raw material emulsion E was 220 nm.

[0124] <Preparation of treatment solution (B-1)> First, the raw material emulsion F contained in the processing solution (B-1) was prepared. Specifically, 300g of unmodified silicone oil (Shin-Etsu Chemical Co., Ltd. "KF-96-3000cs", viscosity: 3,000mm) was used. 2 600g of deionized water (1 mol / L concentration) and 100g of hydrochloric acid (1 mol / L concentration) 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"). Only emulsion particles with an average particle size of 1 μm or larger could be produced. Furthermore, when the contents of the beaker were allowed to stand for 30 minutes after stirring, the aqueous phase and oil phase separated, and it was not possible to produce raw material emulsion F. Thus, since raw material emulsion F could not be produced, the preparation of treatment solution (B-1) was not carried out. Also, since the preparation of treatment solution (B-1) was not carried out, evaluation of treatment solution (B-1) was not performed.

[0125] Table 1 below summarizes the types of raw material emulsions, the average particle size of the emulsion particles, the type and content of the silicone oil, and the viscosity of the silicone oil for processing solutions (A-1) to (A-7) and processing solution (B-1).

[0126] [Table 1]

[0127] In Table 1 and Table 4 shown later, the meanings of each term are as follows: "Quantity" indicates the content of silicone oil in the processing solution. "wt%" indicates mass%. "Viscosity" indicates the viscosity of the silicone oil. If the emulsion particles contain two or more types of silicone oil, "viscosity" indicates the viscosity of the mixture of the two or more types of silicone oil. "-" indicates that raw material emulsion F could not be prepared and therefore the preparation of processing solution (B-1) could not be carried out.

[0128] As shown in Table 1 above, processing solutions (A-1) to (A-7) all contain emulsion particles containing silicone oil and an aqueous medium. Furthermore, the average particle size of the emulsion particles in processing solutions (A-1) to (A-7) is within the range of 100 nm to 250 nm. On the other hand, processing solution (B-1) could not produce raw material emulsion F.

[0129] [Measurement methods for each physical property] The average particle size of the emulsion particles in the raw material emulsion and the viscosity of the silicone oil were measured by the method described below.

[0130] <Measurement of average particle size of emulsified particles> The average particle size of the emulsion particles was measured using a laser diffraction particle size distribution analyzer (Malvern's "Zetasizer Nano ZS") 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 emulsion particles, a sample was used in which the processing solution or the raw material emulsion (when two different raw material emulsions are mixed) was diluted 1000 times with water. The average particle size of the emulsion particles contained in the raw material emulsion and the average particle size of the emulsion particles contained in the processing solution are approximately the same.

[0131] <Measuring the viscosity of silicone oil> The viscosity of the silicone oil was measured in an environment of 25°C in accordance with the method described in JIS Z8803:2011 (Method for measuring the viscosity of liquids). An Ubbelohde viscometer, as described in "6.2.3 Ubbelohde Viscometer" of JIS Z8803:2011, was used to measure the viscosity of the silicone oil.

[0132] [Evaluation Method] The suppression of the reduction in friction fastness and tactile feel of various printed materials was evaluated using each prepared treatment solution. Specifically, evaluation inks and evaluation printed materials were prepared using these evaluation inks and each treatment solution, and the suppression of the reduction in friction fastness and tactile feel was evaluated. The details of the preparation method for the evaluation inks, the preparation method for the evaluation printed materials, and the various evaluation methods are described below.

[0133] <Method for preparing evaluation ink> Inks a and b, used for evaluating the processing solution, were prepared by the method described below.

[0134] (Method for preparing ink a) 125 g of deionized water and 2 g of nonionic surfactant (Surfinol® 440, manufactured by Nisshin Chemical Industry Co., Ltd., contents: acetylene glycol ethylene oxide adduct) were placed in a 1 L three-necked flask equipped with a stirring blade. While stirring the contents of the flask, 165 g of propylene glycol, 100 g of black pigment dispersion (AE2078F, manufactured by Sanyo Shikiso Co., Ltd., contents: CIPigment Black 7, solid content concentration: 20% by mass), and 108 g of binder resin particle dispersion (Superflex 470, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., contents: polyurethane dispersion, solid content concentration: 38% by mass) were added to the flask in order. The contents of the flask were stirred for 10 minutes to obtain ink a.

[0135] (Method for preparing ink b) 140 g of deionized water and 2 g of nonionic surfactant (Surfinol® 440, manufactured by Nisshin Chemical Industry Co., Ltd., contents: acetylene glycol ethylene oxide adduct) were placed in a 1 L three-necked flask equipped with a stirring blade. While stirring the contents of the flask, 225 g of propylene glycol, 83 g of black pigment dispersion (ACAK1, manufactured by Dainichi Seika Kogyo Co., Ltd., contents: CIPigment Black 7, solid content concentration: 15% by mass), and 50 g of binder resin particle dispersion (Eternacoll® UW-1527F, manufactured by Ube Industries, Ltd., contents: polyurethane dispersion, solid content concentration: 40% by mass) were added to the flask in order. The contents of the flask were stirred for 10 minutes to obtain ink b.

[0136] <Method for preparing printable samples for evaluation> Evaluation prints were prepared using the inks and processing solutions shown in Table 2 below. For example, processing solution (A-1) and ink a were used to evaluate Example 1-1 in Table 2.

[0137] The fabric to be printed is cotton broadcloth (manufactured by Irozome Co., Ltd., size: A4, warp and weft cotton count: 40 / 1, warp density: 130 threads / inch, weft density: 75 threads / inch, weight: 122g / m²). 2 An inkjet printer (Seiko Epson Corporation's "Colorio® PX-045A") was used to prepare the evaluation prints. Ink was filled into the first ink chamber of the first cartridge. Processing solution was filled into the second ink chamber of the second cartridge. The first and second cartridges were installed in the inkjet printer. The ink filled into the first ink chamber is ejected from the inkjet printer's recording head. The processing solution filled into the second ink chamber is ejected from the inkjet printer's processing head.

[0138] Using an inkjet printer, the ink ejection rate is 20 g / m². 2In this manner, ink was ejected from the recording head onto the printing target to form a solid image of ink. Next, using an inkjet printer, the ejection rate of the processing solution was 20 g / m² as described above. 2 The processing solution was discharged from the processing head onto the object to be printed. In this way, a processing film the same size as the solid image was formed on the solid image of the ink by the processing solution. Next, the object to be printed was heated at 160°C for 3 minutes to dry the ink and processing solution, and an evaluation print was obtained.

[0139] <Evaluation of frictional hardness> The solid image formed on the evaluation print was rubbed using a white cotton cloth for friction, according to the dry and wet tests of the Type II (JSPS type) friction test machine described in JIS L-0849:2013 (Test method for color fastness to friction). The degree of discoloration of the white cotton cloth for friction after friction was evaluated in accordance with the "criteria for determining discoloration" described in Clause 10 (Determination of color fastness) of JIS L-0801:2011 (General rules for test method for color fastness). The degree of discoloration of the white cotton cloth for friction was judged on a 9-point scale (in descending order of degree of staining: Grade 1, Grade 1-2, Grade 2, Grade 2-3, Grade 3, Grade 3-4, Grade 4, Grade 4-5, and Grade 5). The lower the degree of discoloration of the white cotton cloth for friction (closer to Grade 5), the better the color fastness. From the degree of discoloration of the white cotton cloth for friction after the friction test, the dry color fastness and wet color fastness were evaluated according to the following criteria. The result of the dry test described above was defined as the dry rub fastness, and the result of the wet test described above was defined as the wet rub fastness. A rating of A or B was considered a pass, and a rating of C was considered a fail. The determined rub fastness and its evaluation results are summarized in Table 2 below.

[0140] (Evaluation criteria for dry friction fastness) Rating A: Dry friction fastness is grade 4 or higher. Rating B: Dry friction fastness is grade 3-4. Rating C: Dry friction fastness is grade 3 or lower.

[0141] (Evaluation criteria for wet friction fastness) Rating A: Wet abrasion fastness is Grade 3 or higher. Rating B: Wet abrasion fastness is grade 2-3. Rating C: Wet abrasion fastness is 2nd grade or lower.

[0142] <Evaluation regarding the suppression of the decline in tactile sensation> An unused printable object was folded in half along the warp threads (lengthwise), and the distance between the lower and upper layers of fabric at the fold (loop height) was measured. The measured loop height of the unused printable object was defined as the loop height before printing. Next, the region where the solid image of the evaluation print was formed was folded in half along the warp threads (lengthwise), and the loop height was measured. The measured loop height of the evaluation print was defined as the loop height after printing. The percentage change in loop height before and after printing (in %) was calculated according to the formula "Percentage change in loop height = 100 × Loop height after printing / Loop height before printing". A lower percentage change in loop height indicates that the printable object does not harden or swell after printing, thus suppressing the deterioration of the tactile feel of the printable object. Based on the percentage change in loop height, whether or not the deterioration of the tactile feel of the printable object was suppressed was evaluated according to the following criteria. A rating of A or B was considered a pass, and a rating of C was considered a fail. The measured rate of change in loop height and the evaluation results regarding the suppression of tactile degradation are summarized in Table 2 below.

[0143] (Evaluation criteria for suppressing the decline in tactile sensation) Evaluation A: The rate of change in loop height is 125% or less. Evaluation B: The rate of change in loop height is between 125% and 130%. Evaluation C: The rate of change in loop height exceeds 130%.

[0144] [Table 2]

[0145] In Table 2 above and Table 3 below, the meaning of each term is as follows: "Tactile feel" indicates an evaluation of the suppression of the deterioration of the tactile feel of the printed material. "Height" indicates the rate of change in loop height before and after printing. In the column for friction fastness, "1-2", "2-3", "3-4", and "4-5" indicate that the degree of coloring of the white cotton cloth for friction is grade 1-2, grade 2-3, grade 3-4, and grade 4-5, respectively. "-" indicates that, as already mentioned, raw material emulsion F could not be prepared and therefore treatment solution (B-1) could not be prepared, and thus evaluation of treatment solution (B-1) could not be performed.

[0146] [Consideration] As shown in Table 2 above, for printed materials produced using processing solutions (A-1) to (A-7), the evaluation of dry rubbing fastness, wet rubbing fastness, and suppression of deterioration in tactile feel was all A or B, regardless of the type of ink. Therefore, it is determined that the inkjet processing solutions in this embodiment, which include processing solutions (A-1) to (A-7), can produce printed materials with excellent rubbing fastness and suppress deterioration in the tactile feel of the printed materials.

[0147] 2. Evaluation test for suppressing the decrease in friction fastness and tactile feel of printed materials when the discharge volume of the processing solution is varied. In this test, the aforementioned processing solution (A-1) was used as the inkjet processing solution, and various evaluation prints were prepared while varying the discharge volume of the processing solution. The suppression of the reduction in friction fastness and tactile feel of these evaluation prints was then evaluated.

[0148] <Method for preparing evaluation prints for Examples 1-1, 1-9 to 1-11, and 1-8> Regarding the preparation of evaluation prints for Examples 1-1, 1-9 to 1-11, and 1-8, the evaluation prints were prepared using the same method as described in Section 1 above, except for the following changes. Specifically, the first ink chamber of the first cartridge was filled with the ink shown in Table 3 below, and the second ink chamber of the second cartridge was filled with processing solution (A-1). In each example, the discharge rate of the processing solution was set to the discharge rate shown in Table 3 below. The ink discharge rate was 20 g / m². 2 I left it as is and didn't change it.

[0149] <Method for preparing evaluation prints for Examples 1-12> Regarding the preparation of the evaluation prints for Examples 1-12, the printing targets with solid ink images were prepared using the same method as described in Section 1 above, except for the following changes. Specifically, the first ink chamber of the first cartridge was filled with the inks shown in Table 3 below, and the second ink chamber of the second cartridge was not filled with processing liquid. That is, the discharge rate of the processing liquid was set to 0 g / m². 2 The setting was changed so that the processing liquid was not ejected from the processing head. The ink ejection rate was 20 g / m². 2 I left it as is and didn't change it.

[0150] Next, the printing object on which the solid image of the ink had been formed was impregnated with processing solution (A-1), then removed from processing solution (A-1) and lightly squeezed. Specifically, the pickup rate was 100%, and the amount of processing solution (A-1) applied was 120 g / m². 2 The target material for printing was narrowed down accordingly. The narrowed target material was heated at 160°C for 3 minutes to dry the ink and processing solution, and evaluation prints were obtained.

[0151] <Evaluation of suppression of deterioration in friction fastness and tactile feel> The evaluation prints prepared using the processing solution (A-1) of Examples 1-1, 1-9 to 1-12, and 1-8 were evaluated using the same method as the evaluation of friction fastness described in Section 1 above, and the same method as the evaluation of suppression of deterioration of tactile feel described in Section 1 above. The evaluation results are shown in Table 3 below. Note that the evaluation results for the evaluation prints prepared using the processing solution (A-1) used in Examples 1-1 and 1-8 have already been shown in Table 2 above, but are shown again in Table 3 below to aid understanding.

[0152] [Table 3]

[0153] [Consideration] As shown in Table 3 above, 10 g / m 2 More than 120g / m 2 For printed materials produced with the following discharge rates (including coating rates), the evaluation of dry rubbing fastness, wet rubbing fastness, and suppression of tactile degradation was all A or B. Therefore, 10 g / m 2 More than 120g / m 2 It is determined that by dispensing or applying the inkjet processing solution in this embodiment within the following wide range of discharge volumes (including coating volumes), it is possible to produce printed materials with excellent friction fastness and suppress the deterioration of the tactile feel of the printed materials.

[0154] Furthermore, as shown in Table 3 above, 15 g / m 2 More than 30g / m 2 For the printed material formed using the following discharge volume of processing solution (A-1), the dry friction fastness was evaluated as A. Therefore, 15 g / m² 2 More than 30g / m 2 It is determined that by dispensing the inkjet processing solution in this embodiment at the following discharge volumes, it is possible to produce printed materials with particularly excellent dry friction fastness.

[0155] 3. Evaluation test of friction fastness and discharge performance when the average particle size of emulsion particles is varied. In this study, various printed materials were prepared while varying the average particle size of the emulsion particles. The friction fastness of the prepared printed materials was then evaluated. Simultaneously, the discharge performance of the processing solution from the nozzle was also evaluated according to the average particle size of the emulsion particles in each processing solution.

[0156] [Method for preparing the treatment solution] In this experiment, treatment solutions were used in which the average particle size of the emulsion particles of carboxy-modified silicone oil, or the average particle size of both the emulsion particles of carboxy-modified silicone oil and the emulsion particles of unmodified silicone oil, were varied to various values. The detailed preparation methods for treatment solutions (C-1) to (C-6) and treatment solutions (D-1) to (D-4) used in this experiment are described below.

[0157] <Preparation of treatment solution (C-1)> Except for the addition of 50 g of sodium hydroxide aqueous solution, 570 g of deionized water, and 80 g of surfactant (polyoxyethylene alkyl ether) during the preparation of raw material emulsion B, treatment solution (C-1) was obtained by the same method as the preparation of treatment solution (A-4) described in 1. above. The average particle size of the emulsion particles of carboxy-modified silicone oil in treatment solution (C-1) was 102 nm.

[0158] <Preparation of treatment solution (C-2)> Except for the addition of 50 g of sodium hydroxide aqueous solution, 590 g of deionized water, and 60 g of surfactant (polyoxyethylene alkyl ether) during the preparation of raw material emulsion B, treatment solution (C-2) was obtained using the same method as the preparation of treatment solution (A-4) described in 1. above. The average particle size of the emulsion particles of carboxy-modified silicone oil in treatment solution (C-2) was 137 nm.

[0159] <Preparation of treatment solution (C-3)> Except for the addition of 50 g of sodium hydroxide aqueous solution, 610 g of deionized water, and 40 g of surfactant (polyoxyethylene alkyl ether) during the preparation of raw material emulsion B, treatment solution (C-3) was obtained by the same method as the preparation of treatment solution (A-4) described in 1. above. The average particle size of the emulsion particles of carboxy-modified silicone oil in treatment solution (C-3) was 189 nm.

[0160] <Preparation of treatment solution (C-4)> Except for the addition of 50 g of sodium hydroxide aqueous solution, 630 g of deionized water, and 20 g of surfactant (polyoxyethylene alkyl ether) during the preparation of raw material emulsion B, treatment solution (C-4) was obtained by the same method as the preparation of treatment solution (A-4) described in 1. above. The average particle size of the emulsion particles of carboxy-modified silicone oil in treatment solution (C-4) was 247 nm.

[0161] <Preparation of treatment solution (C-5)> The raw material emulsion used in the preparation of processing solution (C-1) was designated as the first raw material emulsion. The average particle size of the emulsion particles of carboxy-modified silicone oil contained in this first raw material emulsion is 102 nm.

[0162] Next, a second raw material emulsion containing unmodified silicone oil was prepared. Specifically, 300 g of unmodified silicone oil (specifically, dimethylpolysiloxane) (Shin-Etsu Chemical Co., Ltd. "KF96-3000cs", viscosity: 3,000 mm) was used. 2610 g of deionized water (600 s, specific gravity: 0.97) and 90 g of surfactant (polyoxyethylene alkyl ether) 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 then allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120-mesh stainless steel filter to obtain a second raw material emulsion containing unmodified silicone oil. The average particle size of the emulsion particles of unmodified silicone oil contained in this second raw material emulsion was 115 nm.

[0163] Treatment solution (C-5) was obtained by mixing 16.67 g of the first raw material emulsion and 16.67 g of the second raw material emulsion with 33.31 g of deionized water and 33.35 g of propylene glycol. The average particle size of the emulsion particles in treatment solution (C-5) (average particle size of the emulsion particles at the time of mixing) was 106 nm.

[0164] <Preparation of treatment solution (C-6)> The raw material emulsion used in the preparation of processing solution (C-4) was designated as the first raw material emulsion. The average particle size of the emulsion particles of carboxy-modified silicone oil contained in this first raw material emulsion is 247 nm.

[0165] Next, a second raw material emulsion containing unmodified silicone oil was prepared. Specifically, 300 g of unmodified silicone oil (specifically, dimethylpolysiloxane) (Shin-Etsu Chemical Co., Ltd. "KF96-3000cs", viscosity: 3,000 mm) was used. 2655 g of deionized water (600 s, specific gravity: 0.97) and 45 g of surfactant (polyoxyethylene alkyl ether) 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 then allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120-mesh stainless steel filter to obtain a second raw material emulsion containing unmodified silicone oil. The average particle size of the emulsion particles of unmodified silicone oil contained in this second raw material emulsion was 240 nm.

[0166] Treatment solution (C-6) was obtained by mixing 16.67 g of the first raw material emulsion and 16.67 g of the second raw material emulsion with 33.31 g of deionized water and 33.35 g of propylene glycol. The average particle size of the emulsion particles in treatment solution (C-6) (average particle size of the emulsion particles at the time of mixing) was 245 nm.

[0167] <Preparation of treatment solution (D-1)> Except for the addition of 50 g of sodium hydroxide aqueous solution, 560 g of deionized water, and 90 g of surfactant (polyoxyethylene alkyl ether) during the preparation of raw material emulsion B, treatment solution (D-1) was obtained by the same method as the preparation of treatment solution (A-4) described in 1. above. The average particle size of the emulsion particles of carboxy-modified silicone oil in treatment solution (D-1) was 75 nm.

[0168] <Preparation of treatment solution (D-2)> Except for the addition of 50 g of sodium hydroxide aqueous solution and 650 g of deionized water during the preparation of raw material emulsion B, and the addition of a surfactant, treatment solution (D-2) was obtained using the same method as the preparation of treatment solution (A-4) described in 1. above. The average particle size of the emulsion particles of carboxy-modified silicone oil in treatment solution (D-2) was 323 nm.

[0169] <Preparation of treatment solution (D-3)> The raw material emulsion used in the preparation of processing solution (D-1) was designated as the first raw material emulsion. The average particle size of the emulsion particles of carboxy-modified silicone oil contained in this first raw material emulsion is 75 nm.

[0170] Next, a second raw material emulsion containing unmodified silicone oil was prepared. Specifically, 300 g of unmodified silicone oil (specifically, dimethylpolysiloxane) (Shin-Etsu Chemical Co., Ltd. "KF96-3000cs", viscosity: 3,000 mm) was used. 2 580 g of deionized water (60°F, specific gravity: 0.97) and 120 g of surfactant (polyoxyethylene alkyl ether) 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 then allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120-mesh stainless steel filter to obtain a second raw material emulsion containing unmodified silicone oil. The average particle size of the emulsion particles of unmodified silicone oil contained in this second raw material emulsion was 86 nm.

[0171] Treatment solution (D-3) was obtained by mixing 16.67 g of the first raw material emulsion and 16.67 g of the second raw material emulsion with 33.31 g of deionized water and 33.35 g of propylene glycol. The average particle size of the emulsion particles in treatment solution (D-3) (average particle size of the emulsion particles at the time of mixing) was 80 nm.

[0172] <Preparation of treatment solution (D-4)> The raw material emulsion used in the preparation of processing solution (D-2) was designated as the first raw material emulsion. The average particle size of the emulsion particles of carboxy-modified silicone oil contained in this first raw material emulsion is 323 nm.

[0173] Next, a second raw material emulsion containing unmodified silicone oil was prepared. Specifically, 300 g of unmodified silicone oil (specifically, dimethylpolysiloxane) (Shin-Etsu Chemical Co., Ltd. "KF96-3000cs", viscosity: 3,000 mm) was used. 2 680 g of deionized water (600 s, specific gravity: 0.97) and 20 g of surfactant (polyoxyethylene alkyl ether) 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 then allowed to stand for 30 minutes. Next, the contents of the beaker were filtered through a 120-mesh stainless steel filter to obtain a second raw material emulsion containing unmodified silicone oil. The average particle size of the emulsion particles of unmodified silicone oil contained in this second raw material emulsion was 350 nm.

[0174] Treatment solution (D-4) was obtained by mixing 16.67 g of the first raw material emulsion and 16.67 g of the second raw material emulsion with 33.31 g of deionized water and 33.35 g of propylene glycol. The average particle size of the emulsion particles in treatment solution (D-4) (average particle size of the emulsion particles at the time of mixing) was 340 nm.

[0175] Next, evaluation prints were prepared using the prepared treatment solutions (C-1) to (C-6) and treatment solutions (D-1) to (D-4), and their rubbing fastness was evaluated.

[0176] <Methods for preparing evaluation prints for Examples 2-1 to 2-6 and Comparative Examples 2-1 to 2-4> Regarding the preparation of the printed materials for Examples 2-1 to 2-6 and Comparative Examples 2-1 to 2-4, the evaluation printed materials were prepared using the same method as the method for preparing the evaluation printed materials described in Section 1 above, except for the following changes. Specifically, the first ink chamber of the first cartridge was filled with ink a, and the second ink chamber of the second cartridge was filled with one of the processing solutions (C-1) to (C-6) and processing solutions (D-1) to (D-4) shown in Table 4 below. The method for preparing the inks used is the same as the method described in Section 1 above. In each example and comparative example, the discharge rate of the processing solution was 10 g / m². 2 It was set to 20g / m². 2 That's what I decided.

[0177] <Evaluation of frictional hardness> The printed materials of Examples 2-1 to 2-6 and Comparative Examples 2-1 to 2-4 were evaluated using the same method as the evaluation of rubbing fastness described in Section 1 above. The evaluation results for the printed materials of each example and comparative example are summarized in Table 4 below.

[0178] In this test, the discharge performance from the processing head of the processing solutions (C-1) to (C-6) and processing solutions (D-1) to (D-4) used in each example and comparative example was also evaluated. The evaluation method for discharge performance is described in detail below.

[0179] <Evaluation of discharge capacity> The discharge performance of the processing liquid was evaluated using a discharge evaluation machine (Kyocera Corporation, "KJ4B") that allows for confirmation of the discharge of each drop of processing liquid from the nozzle via camera footage. The conditions for the discharge evaluation machine were set as follows. (Conditions for the discharge evaluation machine) Head temperature: 32℃ Discharge volume of processing liquid from the head: 10g / m 2 Driving frequency: 30kHz

[0180] The specific method for evaluating the discharge performance is as follows: First, using the discharge evaluation machine, the camera position was adjusted so that three nozzles were visible in one field of view. Next, the discharge of the processing liquid was started, and for one minute, it was visually confirmed through the camera image whether the processing liquid was being discharged normally or not. After one minute, the number of nozzles that were discharging the processing liquid normally was counted. Here, a nozzle that was discharging the processing liquid normally is defined as a nozzle other than those that were not discharging the processing liquid normally (nozzles that were not discharging the processing liquid straight, nozzles that were not discharging the processing liquid, nozzles that were overflowing the processing liquid, etc.). Furthermore, the camera position was moved, and the same check of the processing liquid discharge performance over one minute through the camera image was repeated for other nozzles. A total of 36 nozzles were checked at a total of 12 locations. Finally, the number of nozzles that were discharging the processing liquid normally was totaled, and the discharge performance of the processing liquid was evaluated according to the following criteria. (Judgment criteria) A:36 B:34~35 C:33 or less

[0181] The types of processing solutions used in each example and comparative example (such as the average particle size of the emulsion particles and the type of silicone oil), as well as the evaluation results of friction fastness and discharge performance, are summarized in Table 4 below.

[0182] [Table 4]

[0183] [Consideration] As shown in Table 4 above, for Examples 2-1 to 2-6, which used treatment solutions (C-1) to (C-6) in which the average particle size of the emulsion particles of the silicone oil (or the average particle size when the two emulsion particles are mixed, if two types of emulsion particles are included) was in the range of 100 nm to 250 nm, the evaluation of dry rubbing fastness and wet rubbing fastness was all A or B. On the other hand, for the printed material of Comparative Example 2-1, which used treatment solution (D-1) with an average particle size of 75 nm of emulsion particles, and the printed material of Comparative Example 2-3, which used treatment solutions (D-4) with average particle sizes of 75 nm and 86 nm of emulsion particles, the evaluation of dry rubbing fastness and wet rubbing fastness, especially wet rubbing fastness, was poor. This is presumed to be because the hydrophilicity of the treatment solution increased, resulting in poor water resistance of the printed material. The prints from Comparative Example 2-2, which used processing solution (D-2) with an average particle size of 323 nm for the emulsion particles, and the prints from Comparative Example 2-4, which used processing solutions (D-4) with average particle sizes of 323 and 350 nm for the emulsion particles, showed significantly poor discharge performance. This is presumed to be because the meniscus becomes unstable when the particle size is large.

[0184] In other words, if the average particle size of the emulsion particles of the silicone oil in the processing solution (or the average particle size of both emulsion particles if two types of emulsion particles are included) is between 100 nm and 250 nm, it was possible to produce printed materials with excellent discharge properties of the processing solution and excellent dry and wet rubbing fastness.

[0185] The embodiments and examples disclosed herein should be understood in all respects to be illustrative and not restrictive. The scope of this disclosure is defined by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended. [Industrial applicability]

[0186] The processing solution, inkjet printing apparatus, and inkjet printing method relating to this disclosure can be used to form printed materials. [Explanation of symbols]

[0187] 1: Recording head 1a: First recording head 1b: Second recording head 1c: Third recording head 1d: 4th recording head 2: Processing head 3: Mounting platform 10: Inkjet printing equipment P: Printing target

Claims

1. A method for producing a silicone oil-containing emulsion comprising: mixing a silicone oil with at least an aqueous medium to emulsify the mixture, thereby obtaining a treatment liquid in which emulsified particles containing the silicone oil are dispersed in the aqueous medium; The method for producing a treatment liquid for inkjet printing, wherein the emulsified particles have an average particle size of 100 nm or more and 250 nm or less.

2. A set comprising an inkjet treatment liquid and an ink containing a pigment, the inkjet treatment liquid contains emulsion particles containing silicone oil and an aqueous medium; The set, wherein the average particle size of the emulsified particles is 100 nm or more and 250 nm or less.

3. The set according to claim 2 , wherein the average particle size of the emulsified particles is 100 nm or more and 160 nm or less.

4. the emulsified particles include first emulsified particles and second emulsified particles having an average particle size different from that of the first emulsified particles, the first emulsified particles have an average particle size of 100 nm or more and 250 nm or less; The set according to claim 2 , wherein the second emulsified particles have an average particle size of 100 nm or more and 250 nm or less.

5. the first emulsified particles have an average particle size of 100 nm or more and 160 nm or less; The set according to claim 4 , wherein the second emulsified particles have an average particle size of 100 nm or more and 160 nm or less.

6. The set according to claim 4 , wherein the difference between the average particle size of the first emulsified particles and the average particle size of the second emulsified particles is 0 nm or more and 30 nm or less.

7. The set according to claim 2 , wherein the silicone oil comprises at least an ionic group-containing silicone oil.

8. The set according to any one of claims 2 to 7, which is for textile printing.

9. A printed product in which an image is formed by ejecting ink from a recording head onto an image forming area of ​​a printing target, and a treatment film is formed by ejecting inkjet treatment liquid from a treatment head, the inkjet treatment liquid contains emulsion particles containing silicone oil and an aqueous medium; The average particle size of the emulsified particles is 100 nm or more and 250 nm or less.

10. A printed material as described in Claim 9, wherein the average particle diameter of the emulsified particles is 100 nm or more and 160 nm or less.

11. The emulsified particles include first emulsified particles and second emulsified particles having an average particle diameter different from that of the first emulsified particles, the first emulsified particles have an average particle size of 100 nm or more and 250 nm or less; The printed material according to claim 9 , wherein the second emulsified particles have an average particle size of 100 nm or more and 250 nm or less.

12. The average particle diameter of the first emulsified particles is 100 nm or more and 160 nm or less, The printed item according to claim 11, wherein the second emulsified particles have an average particle size of 100 nm or more and 160 nm or less.

13. A printed material as described in claim 11, wherein the difference between the average particle diameter of the first emulsified particles and the average particle diameter of the second emulsified particles is 0 nm or more and 30 nm or less.

14. A printed material described in any one of claims 9 to 13, wherein the silicone oil contains at least an ionic group-containing silicone oil.

15. a recording head that ejects ink onto an image forming area of ​​a textile printing target, a processing head that ejects a treatment liquid onto at least the image forming area of ​​the textile printing target, and a cartridge filled with the treatment liquid; the treatment liquid is an inkjet treatment liquid containing emulsified particles containing silicone oil and an aqueous medium, The inkjet printing apparatus, wherein the emulsified particles have an average particle size of 100 nm or more and 250 nm or less.

16. an ink ejection step of ejecting ink from a recording head onto an image formation area of ​​a textile printing target, and a processing step of ejecting a processing liquid from a processing head onto at least the image formation area of ​​the textile printing target, the treatment liquid is an inkjet treatment liquid containing emulsified particles containing silicone oil and an aqueous medium, The ink-jet printing method, wherein the emulsified particles have an average particle size of 100 nm or more and 250 nm or less.

Images