WO2023037923A1 - インクジェット用処理液、インクジェット捺染装置、およびインクジェット捺染方法 - Google Patents
インクジェット用処理液、インクジェット捺染装置、およびインクジェット捺染方法 Download PDFInfo
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- WO2023037923A1 WO2023037923A1 PCT/JP2022/032480 JP2022032480W WO2023037923A1 WO 2023037923 A1 WO2023037923 A1 WO 2023037923A1 JP 2022032480 W JP2022032480 W JP 2022032480W WO 2023037923 A1 WO2023037923 A1 WO 2023037923A1
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- treatment liquid
- silicone oil
- emulsified particles
- average particle
- ink
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/54—Inks based on two liquids, one liquid being the ink, the other liquid being a reaction solution, a fixer or a treatment solution for the ink
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/36—Inkjet printing inks based on non-aqueous solvents
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/02—After-treatment
- D06P5/04—After-treatment with organic compounds
- D06P5/08—After-treatment with organic compounds macromolecular
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/30—Ink jet printing
Definitions
- the present disclosure relates to an inkjet treatment liquid, an inkjet printing apparatus, and an inkjet printing method.
- an ink containing a pigment is used.
- Pigment-containing inks are sometimes used together with post-treatment liquids in order to improve the friction fastness of an imaged printing object (hereinafter sometimes referred to as printed matter).
- Patent Document 1 a transport roller for an inkjet recording device is known (see Patent Document 1, for example).
- the surface of the transport roller is coated with a treatment liquid containing one or both of fullerene and fullerene derivative.
- the inkjet treatment liquid according to the first aspect of the present disclosure contains emulsified 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.
- FIG. 1 is a side view showing an example of an inkjet textile printing apparatus according to a second embodiment of the present disclosure.
- the friction fastness of the printed material also changes depending on the average particle size of the emulsified particles containing the silicone oil in the treatment liquid.
- the average particle size of emulsified particles is small, it is assumed that there is a possibility of affecting the friction fastness of printed matter. Therefore, from the viewpoint of the average particle size of emulsified particles in the treatment liquid, it is preferable to know the conditions for the properties of the inkjet treatment liquid that can produce a printed material with excellent friction fastness.
- the inkjet treatment liquid is also required to have excellent ejection properties from the treatment head.
- the inkjet treatment liquid can also suppress deterioration in the tactile feel of the printed material.
- the inkjet treatment liquid of the present disclosure can suppress deterioration in the tactile feel of printed materials, can produce printed materials with excellent friction fastness, and has excellent ejection properties from the processing head of an inkjet printing apparatus.
- the volume median diameter (D 50 ) is measured using a laser diffraction/scattering particle size distribution analyzer ("LA-950" manufactured by Horiba, Ltd.). is the median diameter measured by Hereinafter, the volume median diameter may be referred to as " D50 ".
- a "major component” of a material means, by mass, the component that is the most abundant in the material, unless otherwise specified.
- Specific gravity means specific gravity at 25°C, unless otherwise specified.
- Acryl and methacryl may be collectively referred to as "(meth)acryl". Each component described in this specification may be used alone or in combination of two or more.
- the treatment liquid according to the first embodiment contains emulsified particles and an aqueous medium.
- the emulsified particles are dispersed in the aqueous medium of the treatment liquid. That is, the treatment liquid according to the first embodiment is an emulsion, more specifically an oil-in-water (O/W) emulsion.
- O/W oil-in-water
- the treatment liquid according to the first embodiment is suitably used, for example, in an inkjet printing apparatus and an inkjet printing method, which will be described later.
- the treatment liquid according to the first embodiment is, for example, a treatment liquid for post-treatment. Specifically, after an image is formed in the image forming area to be printed with ink, the image forming area is post-treated with the treatment liquid according to the first embodiment.
- the emulsified particles contained in the treatment liquid contain silicone oil.
- the silicone oil preferably contains at least an ionic group-containing silicone oil. By containing the ionic group-containing silicone oil, it is possible to produce prints having particularly excellent wet rubbing fastness.
- the silicone oil may be a silicone oil other than the ionic group-containing silicone oil (hereinafter sometimes referred to as other silicone oil).
- the silicone oil may contain both an ionic group-containing silicone oil and other silicone oils.
- one emulsified particle may contain both the ionic group-containing silicone oil and the other silicone oil.
- two or more types of emulsified particles are contained in the treatment liquid.
- the first emulsified particles contain an ionic group-containing silicone oil
- the second emulsified particles contain another silicone oil. good too.
- the emulsified particles contain at least silicone oil, particularly ionic group-containing silicone oil, the following first to fourth advantages can be obtained.
- Silicone oil has a friction reducing effect.
- the image formed on the printing target is coated with silicone oil, and the coefficient of friction of the surface of the printing target is reduced.
- the friction between threads to be printed is reduced by being coated with silicone oil that has a friction-reducing effect.
- the stiffness of the printed object caused by the image formation is reduced, and the deterioration of the tactile sensation of the printed product is suppressed.
- Silicone oil has water repellency.
- the printing target is coated with the water-repellent silicone oil, and the surface of the printing target is imparted with water repellency.
- the ionic group-containing silicone oil has an ionic group, so that the ink ejected between the ionic group and the printing target and on the ionic group and the printing target It is speculated that an ionic bond is formed between The formation of ionic bonds makes it difficult for water to wash away the ionic group-containing silicone oil from the printing target and the ink. As a result, prints with better wet rub fastness can be produced.
- the ionic group-containing silicone oil has an ionic group, so that the emulsified particles containing the ionic group-containing silicone oil are suitably dispersed in the aqueous medium of the treatment liquid. do.
- a treatment liquid can be more suitably ejected from the treatment head of the inkjet textile printing apparatus.
- the processing liquid is discharged from the processing head, the amount of processing liquid used is reduced compared to the case where the printed matter is immersed in the processing liquid. Therefore, it is difficult for the object to be printed to become rough, and the deterioration of the tactile sensation of the printed product is further suppressed.
- silicone oil with a higher viscosity can be used than when ink containing silicone oil as the base oil is ejected from the print head. This makes it possible to produce prints with better friction fastness.
- the content of silicone oil in the treatment liquid is preferably 5% by mass or more and 15% by mass or less.
- the content of the silicone oil is 5% by mass or more, it is possible to further suppress deterioration of the tactile feel of the printed material and to produce a printed material having excellent friction fastness.
- the content of the silicone oil is 15% by mass or less, it is possible to improve the dischargeability of the treatment liquid from the treatment head of the inkjet printing apparatus.
- the ionic group-containing silicone oil is included as the silicone oil, the content of the silicone oil is 15% by mass or less, so that the ionic group content of the ionic group-containing silicone oil contained in the silicone oil Control excessive increase in volume.
- the content of silicone oil in the treatment liquid is preferably 7% by mass or more, more preferably 9% by mass or more, and even more preferably 10% by mass or more. Also, the content of silicone oil in the treatment liquid is preferably 14% by mass or less, more preferably 13% by mass or less. In particular, by setting the silicone oil content in the treatment liquid to within the range of 10% by mass or more and 13% by mass or less, it is possible to produce a printed material that is superior in both dry friction fastness and wet friction fastness.
- the content of silicone oil in the treatment liquid means the percentage of the mass of silicone oil with respect to the mass of the treatment liquid.
- the emulsified particles contain two or more types of silicone oils (e.g., ionic group-containing silicone oil and other silicone oils)
- the content of the silicone oils is the amount of the two or more types of silicone oils relative to the mass of the treatment liquid. means the percentage of the total mass of
- the viscosity of the silicone oil is preferably 500 mm 2 /s (ie mm 2 /s) or more.
- the silicone oil has a viscosity of 500 mm 2 /s or more, the silicone oil is less likely to detach from the printed matter due to friction, and a printed matter having excellent dry and wet friction fastnesses can be produced.
- the treatment liquid according to the first embodiment is excellent in dischargeability from the treatment head of the inkjet printing apparatus. When the processing liquid is discharged from the processing head, the amount of processing liquid used is reduced compared to the case where the printed matter is immersed in the processing liquid. Therefore, even if silicone oil with a high viscosity of 500 mm 2 /s or more is used as the treatment liquid, it is difficult for the printed object to become rough, and the deterioration of the tactile sensation of the printed product is further suppressed.
- 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, 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 6000 mm 2 /s.
- the viscosity of silicone oil means dynamic viscosity at 25°C.
- the viscosity of silicone oil means the viscosity of a mixture of two or more silicone oils.
- the viscosity of the silicone oil is measured according to the method described in JIS (Japanese Industrial Standard) Z8803:2011 (liquid viscosity measurement method). For example, by extracting the silicone oil from the treatment liquid with toluene, washing, and drying, the silicone oil can be separated from the treatment liquid and the viscosity of the silicone oil can be measured.
- JIS Japanese Industrial Standard
- Z8803:2011 liquid viscosity measurement method
- the average particle size of the emulsified particles is 100 nm or more and 250 nm or less.
- the inkjet treatment liquid according to the first embodiment can suppress deterioration in the tactile sensation of the printed matter and produce a printed matter excellent in friction fastness.
- it is excellent in dischargeability from the processing head of the inkjet textile printing apparatus.
- the friction fastness of the printed matter is significantly reduced. This is presumably because when the particle size of the emulsified particles is too small, the specific surface area of the treatment liquid increases, resulting in an increase in hydrophilicity and a decrease in water resistance.
- the average particle diameter of the emulsified particles exceeds 250 nm, the ejection property of the treatment liquid from the treatment head is significantly deteriorated.
- the average particle size of the emulsified particles is preferably 100 nm or more and 160 nm or less.
- the average particle diameter of the emulsified particles is, for example, and 250 nm.
- the average particle size of the emulsified particles is within a specific range
- the average particle size of each emulsified particle is preferably 100 nm or more and 250 nm or less.
- the difference in the average particle size of each emulsified particle is smaller.
- the average particle diameters of two different types of emulsified particles are both in the range of 100 nm or more and 160 nm or less.
- the average particle size of the first emulsified particles is 100 nm or more and 250 nm or less. It is preferable that the average particle size of the second emulsified particles is 100 nm or more and 250 nm or less. More preferably, the average particle size of the first emulsified particles is 100 nm or more and 160 nm or less, and the average particle size of the second emulsified particles is 100 nm or more and 160 nm or less. Further, it is more preferable that 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.
- the average particle size of emulsified particles means the harmonic average particle size (also called the cumulant average particle size) based on the scattered light intensity calculated based on the cumulant method.
- the average particle size of emulsion particles is measured according to the method described in ISO 13321:1996 (Particle size analysis-Photon correlation spectroscopy).
- the emulsified particles may further contain components other than silicone oil.
- silicone oil when the emulsified particles contain only silicone oil, it is possible to more reliably produce a printed material with excellent friction fastness and to more reliably suppress deterioration of the tactile feel of the printed material.
- the silicone oil contained in the emulsified particles may be either one of the ionic group-containing silicone oil and other silicone oils.
- the silicone oil may contain both an ionic group-containing silicone oil and other silicone oils.
- one emulsified particle may contain both the ionic group-containing silicone oil and the other silicone oil.
- the first emulsified particles may contain the ionic group-containing silicone oil
- the second emulsified particles may contain another silicone oil.
- the ionic group-containing silicone oil and other silicone oils are described below.
- the ionic group-containing silicone oil is modified silicone oil, more specifically, ionic group-modified silicone oil.
- ionic group-modified silicone oils include modified silicone oils in which ionic groups are introduced into side chains and modified silicone oils in which ionic groups are introduced into terminal groups.
- Modified silicone oil in which an ionic group is introduced into the side chain includes a first terminal group represented by the following formula (1a), a repeating unit represented by the following formula (1b), and the following formula (1c ) and a second terminal group represented by the following formula (1d).
- * in formula (1a) represents a bond that bonds to the silicon atom in the repeating unit represented by formula (1b) or (1c).
- * in formula (1d) represents a bond that binds to the oxygen atom in the repeating unit represented by formula (1b) or (1c).
- R 1 in formula (1c) represents a group containing an ionic group.
- the ionic group of the group containing an ionic group is preferably an amino group, a carboxyl group, a phenolic hydroxy group, or a silanol group.
- the modified silicone oil in which an ionic group is introduced into the terminal group comprises a first terminal group represented by the following formula (2a), a repeating unit represented by the following formula (2b), and the following formula (2c ) and a second terminal group represented by
- R 2 in formula (2a) and R 3 in formula (2c) each independently represent a group containing an ionic group.
- the ionic group of the group containing an ionic group is preferably an amino group, a carboxyl group, a phenolic hydroxy group, or a silanol group.
- 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, the ionic group-containing silicone oil is more preferably at least one selected from the group consisting of these. Moreover, the ionic group-containing silicone oil is more preferably 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 carboxy group, a phenolic hydroxy group, and a silanol group as ionic groups. Among these, the ionic group-containing silicone oil is more preferably a carboxy-modified silicone oil.
- the functional group equivalent of the ionic group-containing silicone oil is 1000 g/mol or more and 5500 g/mol or less in order to more preferably disperse the emulsified particles in the aqueous medium.
- the functional group equivalent is the molecular weight per 1 mol of functional group (ionic group).
- Functional group equivalents of ionic group-containing silicone oils are, 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, It may be within two values selected from the group consisting of 5000 g/mol, 5200 g/mol and 5500 g/mol.
- the content of the ionic group-containing silicone oil with respect to the total mass of the silicone oil contained in the emulsified particles is 30% by mass or more and 100% by mass or less. It is preferably 40% by mass or more and 100% by mass or less, and particularly preferably 100% by mass.
- silicone oils The silicone oil contained in the treatment liquid may be only other silicone oil. Alternatively, the viscosity of the silicone oil can be adjusted by further containing other silicone oil in addition to the ionic group-containing silicone oil.
- Other silicone oils include, for example, unmodified silicone oils. A more specific example is dimethylpolysiloxane.
- the content of the other silicone oil with respect to the total mass of the silicone oil contained in the emulsified particles is preferably 50% by mass or more and 100% by mass or less, and 50% by mass or more. It is more preferably 70% by mass or less, and even more preferably 50% by mass or more and 60% by mass or less.
- the silicone oil contained in the treatment liquid contains both an ionic group-containing silicone oil and another silicone oil
- the silicone oil is preferably a combination of carboxy-modified silicone oil and dimethylpolysiloxane.
- one emulsified particle may contain both the carboxy-modified silicone oil and the dimethylpolysiloxane.
- the first emulsified particles may contain the carboxy-modified silicone oil
- the second emulsified particles which are separate emulsified particles, may contain the dimethylpolysiloxane.
- the ratio of the mass of the ionic group-containing silicone oil to the mass of the other silicone oil is 0. It is preferably 5 or more and less than 1.0, more preferably 0.6 or more and 0.7 or less.
- the aqueous medium contained in the treatment liquid is a medium containing water as a main component.
- the aqueous medium may function as a solvent or as a dispersion medium.
- Specific examples of the aqueous medium include water or a mixture of water and a polar solvent.
- Examples of polar solvents contained in aqueous media include methanol, ethanol, isopropyl alcohol, butanol, and methyl ethyl ketone.
- the water content in the aqueous medium is preferably 90% by mass or more, particularly preferably 100% by mass.
- the content of the aqueous medium is preferably 50% by mass or more and 90% by mass or less, more preferably 55% by mass or more and 70% by mass or less, relative to the mass of the treatment liquid.
- the treatment liquid may optionally contain components other than the emulsified particles and the aqueous medium (hereinafter sometimes referred to as other components).
- Other ingredients include acids, bases, polyols, and dispersants.
- the treatment liquid preferably contains an acid.
- the acid promotes ionization of the anionic groups, and the emulsified particles containing the ionic group-containing silicone oil are preferably dispersed in the aqueous medium.
- Acids include, for example, strong acids and weak acids. Strong acids include, for example, hydrochloric acid, paratoluenesulfonic acid, and sulfuric acid. Weak acids include, for example, benzoic acid and acetic acid. A strong acid is preferable as the acid in order to promote the ionization of the anionic groups possessed by the silicone oil.
- the treatment liquid contains an acid
- the content of the acid in terms of the amount of acid at a concentration of 1 mol/L is preferably 1% by mass or more and 5% by mass or less with respect to the mass of the treatment liquid.
- the treatment liquid preferably contains a base. Ionization of the cationic groups is promoted by the base, and the emulsified particles containing the ionic group-containing silicone oil are preferably dispersed in the aqueous medium.
- Bases include, for example, sodium hydroxide.
- polyol By containing a polyol in the treatment liquid, the viscosity of the treatment liquid is suitably adjusted.
- Preferred polyols are diols or triols.
- Diols include, for example, glycol compounds. More specific examples include ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, and tetraethylene glycol.
- Triols include, for example, glycerin.
- the content of the polyol is preferably 10% by mass or more and 40% by mass or less, more preferably 15% by mass or more and 35% by mass or less, relative to the mass of the treatment liquid. preferable.
- Dispersants include, for example, surfactants, resin dispersants, and polysaccharides. However, it is preferable that the emulsified particles are dispersed in the treatment liquid without containing a dispersant. As already mentioned, emulsified particles containing silicone oil, especially ionic group-containing silicone oil, disperse more favorably in an aqueous medium. Therefore, even if the dispersant is not contained, the dispersed state of the emulsified particles can be preferably maintained. Dispersants often have hydrophilic groups. Since the treatment liquid does not contain a dispersant having a hydrophilic group, the wet rubbing fastness of the printed material treated with the treatment liquid is further improved.
- a homogenizer is used to mix and emulsify silicone oil, an aqueous medium, and optionally added ingredients (eg, acid or base, and polyol).
- ingredients eg, acid or base, and polyol.
- a raw material emulsion containing emulsified particles may be produced in advance, and the raw material emulsion, aqueous medium, and optionally polyol may be mixed to obtain a treatment liquid.
- the raw material emulsion contains, for example, silicone oil, a portion of the aqueous medium, and optionally an acid or base.
- the emulsification time is, for example, 5 minutes or more and 1 hour or less.
- the emulsification temperature is, for example, 5°C or higher and 40°C or lower.
- the content of the raw material emulsion is, for example, 15% by mass or more and 50% by mass or less with respect to the mass of the treatment liquid.
- both silicone oils are mixed and emulsified, and the ionic group-containing silicone oil and Emulsified particles containing both unmodified silicone oil may be made to obtain the treatment liquid.
- the first emulsified particles containing the ionic group-containing silicone oil and the second emulsified particles containing the unmodified silicone oil are obtained.
- a treatment liquid mixed with particles may be obtained.
- the method for adjusting the average particle size of the emulsified particles contained in the treatment liquid within the range of 100 nm or more and 250 nm or less is not particularly limited.
- a surfactant may be added and mixed. Specifically, the average particle size of emulsified particles can be made smaller by increasing the amount of surfactant added. Examples of surfactants include polyoxyethylene alkyl ethers.
- FIG. 1 schematically shows mainly each component. The size, number, etc. of each illustrated component may be changed as appropriate.
- FIG. 1 is a side view showing essential parts of an inkjet textile printing apparatus 10, which is an example of an inkjet textile printing apparatus according to a second embodiment.
- the inkjet textile printing apparatus 10 shown in FIG. 1 is a flatbed inkjet textile printing apparatus.
- the inkjet printing apparatus 10 according to the second embodiment processes the printing target P using the treatment liquid according to the first embodiment. Since the treatment liquid according to the first embodiment is used, for the same reason as described in the first embodiment, the inkjet printing apparatus 10 can produce a printed material having excellent fastness to friction, and the tactile sensation of the printed material is improved. can suppress the decrease in Furthermore, since the treatment liquid according to the first embodiment is excellent in ejectability from the treatment head, the inkjet printing apparatus according to the second embodiment can reliably exhibit these effects.
- the inkjet printing apparatus 10 shown in FIG. 1 includes a recording head 1, a processing head 2, and a mounting table 3.
- the recording head 1 has a first recording head 1a, a second recording head 1b, a third recording head 1c, and a fourth recording head 1d.
- the recording head 1 ejects ink onto the image forming area of the printing target P.
- the first recording head 1a, the second recording head 1b, the third recording head 1c, and the fourth recording head 1d included in the recording head 1 each use inks of different colors (for example, yellow ink, magenta ink, cyan ink, and black ink).
- Examples of the recording head 1 include, but are not limited to, a piezo head and a thermal inkjet head.
- the processing head 2 ejects the processing liquid 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 head 2 is not particularly limited, but includes, for example, a piezo system head and a thermal inkjet system head.
- a printing target P is placed on the placement table 3 .
- a recording head 1 and a processing head 2 are arranged above a mounting table 3 so that ink and processing liquid can be ejected onto a printing target P.
- FIG. Driven by a motor (not shown), the mounting table 3 moves horizontally from the recording head 1 toward the processing head 2 (for example, leftward in FIG. 1).
- the printing target P on the mounting table 3 is conveyed by moving the mounting table 3 horizontally.
- the printing target P may be a woven fabric or a knitted fabric.
- Examples of the printing target P include cotton fabric, silk fabric, linen fabric, acetate fabric, rayon fabric, nylon fabric, polyurethane fabric, and polyester fabric.
- the mounting table 3 on which the printing target P is placed moves horizontally, and the printing target P is transported to a position facing the recording head 1 .
- Ink is ejected from the recording head 1 onto the image forming area of the printing target P.
- FIG. In this manner, an image is formed in the image forming area of the printing target P with ink.
- the mounting table 3 on which the printing target P is placed further moves horizontally, and the printing target P is transported to a position facing the processing head 2 .
- the processing liquid is discharged from the processing head 2 onto at least the image forming area of the printing target P.
- a treatment film is formed by the treatment liquid on the image formed in the image forming area of the printing target P.
- the processing head 2 may eject the processing liquid only to the image forming area of the printing target P.
- the processing head 2 may eject the processing liquid onto an area wider than the image forming area of the printing target P, or may eject the processing liquid onto the entire surface of the printing target P. It is preferable that the processing head 2 ejects the processing liquid only to the image forming area of the printing target P in order to reduce the amount of the processing liquid used and suppress the deterioration of the tactile sensation of the printed material. Further, for the same reason, it is more preferable that the processing head 2 ejects the processing liquid only to the area where ink has been ejected by the recording head 1 among the image forming areas.
- the processing head 2 can accurately control the ejection position of the treatment liquid, it is possible to eject the treatment liquid only to the area where the ink has been ejected.
- the distance between the treatment head 2 and the printing target P is preferably 1 mm or more and 5 mm or less.
- the mounting table 3 on which the printing target P is placed further moves horizontally to bring the printing target P to a position facing the heating unit (not shown). be transported.
- the heating unit heats the printing target P to dry the ink and the treatment liquid.
- the heating temperature is, for example, 120° C. or higher and 180° C. or lower.
- the heating time is, for example, 1 minute or more and 10 minutes or less.
- the heating evaporates volatile components contained in the ink and the treatment liquid, thereby promoting fixation of the ink and the treatment liquid to the printing target P.
- a printed material is produced, which is a printing target P on which an image is formed with ink and treated with a treatment liquid.
- the inkjet textile printing apparatus 10 according to the second embodiment has been described above.
- the inkjet textile printing apparatus of the present disclosure is not limited to the inkjet textile printing apparatus 10 described above, and can be modified, for example, as shown in the following modified examples.
- the inkjet textile printing apparatus 10 may be provided with a sprayer for spraying the treatment liquid instead of the treatment head 2 for discharging the treatment liquid.
- the treatment with the treatment liquid may be performed by immersing the printing target P in a tank in which the treatment liquid is stored.
- the discharge amount of the processing liquid described later in the third embodiment corresponds to the coating amount of the processing liquid.
- the mounting table 3 moved horizontally, but the recording head 1 and the processing head 2 may move horizontally while the mounting table 3 is fixed.
- the mounting table 3 moves horizontally, or the recording head 1 and the processing head 2 move horizontally in the direction in which the printing target P is conveyed. may move horizontally in a direction orthogonal to the conveying direction of the .
- the number of recording heads 1 may be 1 to 3 or 5 or more.
- it may be an inkjet printing apparatus that is not a flatbed type. As long as the recording head 1 and the processing head 2 are provided, the effect of using the processing liquid according to the first embodiment can be obtained regardless of the style of the inkjet printing apparatus.
- the inkjet printing method according to the third embodiment forms an image on the image forming area of the printing target P using the treatment liquid according to the first embodiment.
- an image is formed on the image forming area of the textile printing target P using the inkjet textile printing apparatus 10 according to the second embodiment. Since the ink jet printing method according to the third embodiment uses the treatment liquid according to the first embodiment, for the same reason as described in the first embodiment, a printed material having excellent fastness to friction can be produced. It is possible to suppress the decrease in the tactile sensation of Furthermore, since the treatment liquid according to the first embodiment is excellent in ejectability from the treatment head, the inkjet printing method according to the third embodiment can reliably exhibit these effects.
- the inkjet textile printing method includes an ink ejection process and a treatment process.
- ink is ejected from the recording head 1 onto the image forming area of the printing target P.
- the processing liquid is discharged 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 treatment process is performed, for example, after the ink ejection process.
- the inkjet textile printing method may further include a heating step, if necessary.
- the amount of ink ejected onto the printing target P is, for example, 5 g/m 2 or more and 40 g/m 2 or less.
- the ejection amount of the treatment liquid to the printing target P is, for example, 10 g/m 2 or more and 120 g/m 2 or less (including the case of coating).
- the discharge amount of the treatment liquid is preferably 15 g/m 2 or more and 30 g/m 2 or less.
- the discharge amount of the treatment liquid is more preferably 17 g/m 2 or more and 25 g/m 2 or less.
- the ink contains, for example, a pigment and an aqueous medium.
- the ink may further contain at least one selected from the group consisting of surfactants, polyols, and binder resin particles, if necessary.
- a pigment exists, for example, dispersed in an aqueous medium.
- D50 of the pigment is preferably 30 nm or more and 250 nm or less, more preferably 70 nm or more and 160 nm or less, from the viewpoint of obtaining an ink excellent in image density, hue and color stability.
- Examples of pigments include yellow pigments, orange pigments, red pigments, blue pigments, purple pigments, and black pigments.
- Examples of yellow pigments include C.I. I. Pigment Yellow (74, 93, 95, 109, 110, 120, 128, 138, 139, 151, 154, 155, 173, 180, 185, and 193).
- Examples of orange pigments include C.I. I. Pigment Orange (34, 36, 43, 61, 63, and 71).
- Examples of red pigments include C.I. I. Pigment Reds (122 and 202).
- Examples of blue pigments include C.I. I. Pigment Blue (15, more specifically 15:3).
- Examples of purple pigments include C.I. I. Pigment Violet (19, 23, and 33).
- Examples of black pigments include C.I. I. Pigment Black (7) may be mentioned.
- the pigment content is preferably 1% by mass or more and 12% by mass or less, more preferably 1% by mass or more and 7% by mass or less, relative to the mass of the ink.
- the content of the pigment is 1% by mass or more, the image density of the produced printed matter can be improved.
- the pigment content is 12% by mass or less, an ink with high fluidity can be obtained.
- the aqueous medium contained in the ink is synonymous with the aqueous medium contained in the treatment liquid described in the first embodiment.
- the content of the aqueous medium is preferably 5% by mass or more and 70% by mass or less, more preferably 40% by mass or more and 60% by mass or less, relative to the mass of the ink.
- Surfactant When the ink contains a surfactant, the wettability of the ink to the printing target is improved.
- Surfactants include, for example, 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, more preferably an acetylene diol ethylene oxide adduct.
- the HLB value of the surfactant is preferably 3 or more and 20 or less, more preferably 6 or more and 16 or less, and even more preferably 7 or more and 10 or less.
- the content of the surfactant is preferably 0.1% by mass or more and 5.0% by mass or less with respect to the mass of the ink. More preferably, it is 0.5% by mass or more and 2.0% by mass or less.
- polyol Containing a polyol in the ink suitably adjusts the viscosity of the ink.
- the polyol contained in the ink is synonymous with the polyol contained in the treatment liquid described in the first embodiment.
- the polyol content is preferably 5% by mass or more and 60% by mass or less, and preferably 20% by mass or more, relative to the mass of the ink, in order to suitably adjust the viscosity of the ink. It is more preferably 50% by mass or less.
- binder resin particles are present in a dispersed state in the aqueous medium.
- the binder resin particles function as a binder that binds the material to be printed and the pigment. Therefore, by including the binder resin particles in the ink, it is possible to obtain a printed material having excellent pigment fixability.
- the resin contained in the binder resin particles examples include urethane resin, (meth)acrylic resin, styrene-(meth)acrylic resin, styrene-maleic acid copolymer, vinylnaphthalene-(meth)acrylic acid copolymer, and vinylnaphthalene. - maleic acid copolymers.
- a urethane resin is preferable as the resin contained in the binder resin particles.
- the content of the urethane resin in the binder resin particles is preferably 80% by mass or more, more preferably 100% by mass.
- the content of the binder resin is preferably 1% by mass or more and 20% by mass or less, more preferably 2% by mass or more and 10% by mass or less, relative to the mass of the ink.
- the binder resin particle content is 1% by mass or more, it is possible to obtain a printing target having excellent pigment fixability.
- the content of the binder resin particles is 20% by mass or less, the ink can be stably discharged onto the printing target.
- the ink further contains known additives (more specifically, dissolution stabilizers, anti-drying agents, antioxidants, viscosity modifiers, pH modifiers, anti-mold agents, etc.) as necessary. good too.
- the ink is produced by, for example, using a stirrer to mix the pigment, aqueous medium, and optional ingredients (eg, surfactant, polyol, and binder resin particles).
- the mixing time is, for example, 1 minute or more and 30 minutes or less.
- the inkjet treatment liquid according to the first aspect of the present disclosure contains emulsified 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.
- This inkjet treatment liquid suppresses deterioration of the tactile sensation of printed materials, can produce printed materials with excellent friction fastness, and has excellent ejection properties from the processing head of an inkjet printing apparatus.
- the average particle size of the emulsified particles may be 100 nm or more and 160 nm or less.
- the inkjet treatment liquid is more excellent in ejection properties from the treatment head.
- 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 average particle size of the first emulsified particles is 100 nm or more and 250 nm or less
- the average particle size of the second emulsified particles may be 100 nm or more and 250 nm or less.
- the average particle size of the first emulsified particles is 100 nm or more and 160 nm or less
- the average particle size of the second emulsified particles may be 100 nm or more and 160 nm or less.
- the difference between the average particle size of the first emulsified particles and the average particle size of the second emulsified particles may be 0 nm or more and 30 nm or less.
- the silicone oil may include at least an ionic group-containing silicone oil.
- inkjet treatment liquid it may be for textile printing.
- An inkjet printing apparatus includes a recording head that ejects ink onto an image forming area to be printed, and a processing head that ejects a treatment liquid onto at least the image forming area of the printing target,
- the treatment liquid is the inkjet treatment liquid according to the first aspect of the present disclosure.
- this inkjet printing apparatus uses the inkjet treatment liquid according to the first aspect of the present disclosure, it is possible to produce a printed material with a suppressed decrease in tactile sensation and a printed material with excellent friction fastness. can be made. Furthermore, since the inkjet treatment liquid has excellent ejection properties from the treatment head, the effect of the inkjet treatment liquid according to the first aspect of the present disclosure on printed materials can be reliably exhibited.
- An inkjet printing method includes an ink ejection step of ejecting ink from a recording head onto an image forming area to be printed, and ejecting a treatment liquid from a treatment head onto at least the image forming area of the printing object. and a processing step to The treatment liquid is the inkjet treatment liquid according to the first aspect of the present disclosure.
- the inkjet treatment liquid according to the first aspect of the present disclosure is used in this inkjet textile printing method, it is possible to produce a printed material in which deterioration in tactile sensation is suppressed, and the printed material has excellent friction fastness. can be made. Furthermore, since the inkjet treatment liquid has excellent ejection properties from the treatment head, the effect of the inkjet treatment liquid according to the first aspect of the present disclosure on printed materials can be reliably exhibited.
- various printed materials were produced while changing the type and content of silicone oil in the inkjet treatment liquid, the average particle size of the emulsified particles, and the discharge amount of the treatment liquid. And the suppression of the decrease in tactile sensation was evaluated. Furthermore, in this example, the ejection property of the treatment liquid from the nozzle was also evaluated according to the average particle size of the emulsified particles of silicone oil in the inkjet treatment liquid.
- raw material emulsion A contained in treatment liquid (A-1) was prepared. Specifically, 300 g of amino-modified silicone oil ("KF-864" manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 1,700 mm 2 /s, specific gravity: 0.98, functional group equivalent: 3,800 g/mol), 600 g of ion-exchanged water and 100 g of hydrochloric acid (concentration: 1 mol/L) were placed in a beaker. Using a homogenizer ("Ultra Turrax T25" manufactured by IKA), the contents of the beaker were stirred at a rotation speed of 10000 rpm for 15 minutes and allowed to stand for 30 minutes.
- KF-864" manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 1,700 mm 2 /s, specific gravity: 0.98, functional group equivalent: 3,800 g/mol
- 600 g of ion-exchanged water and 100 g of hydrochloric acid concentration
- raw material emulsion A emulsified particles of amino-modified silicone oil were dispersed.
- the average particle size of the emulsified particles contained in the raw material emulsion A was 150 nm.
- a treatment liquid (A-1) was prepared. Specifically, 33.30 g of raw material emulsion A (content of amino-modified silicone oil: 30% by mass, content of amino-modified silicone oil: 9.99 g), 33.35 g of deionized water, and 33.35 g of propylene glycol to obtain a treatment liquid (A-1). The content of the amino-modified silicone oil in the treatment liquid (A-1) was 10% by mass.
- ⁇ Preparation of treatment liquid (A-2)> the raw material emulsion A prepared as described above was used. Specifically, 15.00 g of raw material emulsion A (content of amino-modified silicone oil: 30% by mass, content of amino-modified silicone oil: 4.50 g), 50.00 g of deionized water, and 35.00 g of propylene glycol to obtain a treatment liquid (A-2). The content of the amino-modified silicone oil in the treatment liquid (A-2) was 5% by mass.
- ⁇ Preparation of treatment liquid (A-3)> the raw material emulsion A prepared as described above was used. Specifically, 50.00 g of raw material emulsion A (content of amino-modified silicone oil: 30% by mass, content of amino-modified silicone oil: 15.00 g), 35.00 g of ion-exchanged water, and 15.00 g of propylene glycol to obtain a treatment liquid (A-3). The content of the amino-modified silicone oil in the treatment liquid (A-3) was 15% by mass.
- raw material emulsion B contained in treatment liquid (A-4) was prepared. Specifically, 300 g of carboxy-modified silicone oil (“X-22-3701E” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 2,000 mm 2 /s, specific gravity: 0.98, functional group equivalent: 4,000 g / mol ), 600 g of ion-exchanged water, and 100 g of an aqueous sodium hydroxide solution (concentration: 1 mol/L) were placed in a beaker.
- carboxy-modified silicone oil (“X-22-3701E” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 2,000 mm 2 /s, specific gravity: 0.98, functional group equivalent: 4,000 g / mol )
- 600 g of ion-exchanged water 600 g
- 100 g of an aqueous sodium hydroxide solution concentration: 1 mol/L
- raw material emulsion B emulsified particles of carboxy-modified silicone oil were dispersed.
- the average particle size of the emulsified particles contained in the raw material emulsion B was 120 nm.
- a treatment liquid (A-4) was prepared. Specifically, the treatment liquid (A A treatment liquid (A-4) was obtained in the same manner as in -1). The content of the carboxy-modified silicone oil in the treatment liquid (A-4) was 10% by mass.
- a raw material emulsion C contained in the treatment liquid (A-5) was prepared. Specifically, 300 g of amino-modified silicone oil ("KF-877" manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 5,700 mm 2 /s, specific gravity: 0.98, functional group equivalent: 5,200 g/mol), 600 g of ion-exchanged water and 100 g of hydrochloric acid (concentration: 1 mol/L) were placed in a beaker.
- amino-modified silicone oil (“KF-877” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 5,700 mm 2 /s, specific gravity: 0.98, functional group equivalent: 5,200 g/mol)
- 600 g of ion-exchanged water and 100 g of hydrochloric acid concentration: 1 mol/L
- raw material emulsion C emulsified particles of amino-modified silicone oil were dispersed.
- the average particle size of the emulsified particles contained in the raw material emulsion C was 200 nm.
- a treatment liquid (A-5) was prepared. Specifically, the treatment liquid (A A treatment liquid (A-5) was obtained in the same manner as in -1). The content of the amino-modified silicone oil in the treatment liquid (A-5) was 10% by mass.
- a raw material emulsion D contained in the treatment liquid (A-6) was prepared. Specifically, 180 g of unmodified silicone oil (specifically, dimethylpolysiloxane) (“KF96-3000cs” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 3,000 mm 2 /s, specific gravity: 0.97), And 120 g of phenol-modified silicone oil (“KF2201” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 97 m 2 /s, specific gravity: 0.99, functional group equivalent: 1,474 g / mol) was mixed, and the viscosity was 1,000 mm 2 /s mixture MD was obtained.
- unmodified silicone oil specifically, dimethylpolysiloxane
- a treatment liquid (A-6) was prepared. Specifically, raw material emulsion A (amino-modified silicone oil content: 30% by mass) was changed to raw material emulsion D (mixture content of phenol-modified silicone oil and unmodified silicone oil: 30% by mass).
- a treatment liquid (A-6) was obtained in the same manner as the treatment liquid (A-1), except for the above. In the treatment liquid (A-6), the content of the mixture of phenol-modified silicone oil and non-modified silicone oil was 10% by mass.
- a raw material emulsion E contained in the treatment liquid (A-7) was prepared. Specifically, 180 g of unmodified silicone oil ("KF96-3000cs" manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 3,000 mm 2 /s, specific gravity: 0.97), and 120 g of silanol-modified silicone oil (Shin-Etsu Chemical "KF9701" manufactured by Kogyo Co., Ltd., viscosity: 60 mm 2 /s, specific gravity: 0.977, functional group equivalent: 1,500 g/mol) were mixed to obtain a mixture ME with a viscosity of 1,200 mm 2 /s.
- unmodified silicone oil (“KF96-3000cs” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 3,000 mm 2 /s, specific gravity: 0.97)
- silanol-modified silicone oil Shin-Etsu Chemical "KF9701” manufactured by Kogy
- a raw material emulsion F contained in the treatment liquid (B-1) was prepared. Specifically, 300 g of unmodified silicone oil (“KF-96-3000cs” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 3,000 mm 2 /s, specific gravity: 0.97), 600 g of deionized water, and 100 g of hydrochloric acid (concentration 1 mol/L) was placed in a beaker.
- unmodified silicone oil (“KF-96-3000cs” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 3,000 mm 2 /s, specific gravity: 0.97)
- Type of raw material emulsion, average particle size of emulsified particles, type and content of silicone oil, and silicone oil in treatment liquids (A-1) to (A-7) and treatment liquid (B-1) are summarized in Table 1 below.
- each of the treatment liquids (A-1) to (A-7) contains emulsified particles containing silicone oil and an aqueous medium. Further, in each of the treatment liquids (A-1) to (A-7), the average particle diameter of the emulsified particles is in the range of 100 nm or more and 250 nm or less. On the other hand, the treatment liquid (B-1) could not produce the raw material emulsion F.
- the average particle size of the emulsified particles is measured using a laser diffraction particle size distribution analyzer ("Zetasizer Nano ZS" manufactured by Malvern) in accordance with the method described in ISO 13321:1996 (Particle size analysis-Photon correlation spectroscopy). measured by For the measurement of the average particle size of the emulsified particles, a measurement sample obtained by diluting the treatment liquid or raw material emulsion (when mixing two different raw material emulsions) by 1000 times with water was used. The average particle size of the emulsified particles contained in the raw material emulsion and the average particle size of the emulsified particles contained in the treatment liquid are substantially the same.
- Prints for evaluation were produced using the inks and treatment liquids shown in Table 2 below.
- treatment liquid (A-1) and ink a were used.
- cotton broadcloth manufactured by Shikisen Co., Ltd., size: A4 size, warp and weft cotton count: 40/1, warp density: 130 / inch, weft density: 75 / inch, basis weight : 122 g/m 2
- An inkjet printer (“Colorio (registered trademark) PX-045A” manufactured by Seiko Epson Corporation) was used to prepare the printed material for evaluation.
- Ink was filled into the first ink chamber of the first cartridge.
- the second ink chamber of the second cartridge was filled with the treatment liquid.
- the first cartridge and the second cartridge were loaded into the inkjet printer.
- the ink filled in the first ink chamber is ejected from the recording head of the inkjet printer.
- the processing liquid filled in the second ink chamber is ejected from the processing head of the inkjet printer.
- ink was ejected from a recording head onto a printing target so that the ink ejection amount was 20 g/m 2 to form a solid ink image.
- the treatment liquid was ejected from the treatment head onto the object to be printed so that the ejection amount of the treatment liquid was 20 g/m 2 as described above. In this manner, a treatment film having the same size as the solid image was formed on the solid image of the ink with the treatment liquid.
- the printed material was heated at 160° C. for 3 minutes to dry the ink and the treatment liquid to obtain a printed material for evaluation.
- JIS L-0849: 2013 (Test method for color fastness to rubbing) According to the dry test and wet test of the friction tester type II (Gakushin type) method, the solid image formed on the printed material for evaluation was rubbed. It was rubbed with a white cotton cloth.
- JIS L-0801: 2011 general rules for dyeing fastness test method), in accordance with the "criteria for discoloration and fading" described in Clause 10 (determination of dyeing fastness), and the degree of coloring of the white cotton cloth for rubbing after rubbing. evaluated.
- the degree of coloring of the white cotton cloth for friction is 9 levels (in descending order of degree of contamination, grade 1, grade 1-2, grade 2, grade 2-3, grade 3, grade 3-4, grade 4, grade 4-4). grade 5 and grade 5).
- the friction fastness is better when the degree of coloration of the white cotton cloth for rubbing is smaller (closer to grade 5).
- the dry rubbing fastness and the wet rubbing fastness were evaluated according to the following criteria.
- the determination result of the dry test was defined as the dry friction fastness
- the determination result of the wet test was defined as the wet friction fastness.
- the determined friction fastness and the evaluation results thereof are summarized in Table 2 below.
- Evaluation A The dry friction fastness is grade 4 or higher.
- Evaluation B The dry friction fastness is grade 3-4.
- Evaluation C The dry friction fastness is grade 3 or lower.
- Evaluation A The wet friction fastness is grade 3 or higher.
- Evaluation B Wet friction fastness is grade 2-3.
- Evaluation C Wet friction fastness is grade 2 or lower.
- Evaluation A The rate of change in loop height is 125% or less.
- Evaluation B The rate of change in loop height is more than 125% and 130% or less.
- Evaluation C The rate of change in loop height is over 130%.
- the printed materials produced using the treatment liquids (A-1) to (A-7) were evaluated for suppression of deterioration in dry friction fastness, wet friction fastness and tactile feel. was A or B regardless of the type of ink. Therefore, according to the inkjet treatment liquid of the present embodiment, which includes the treatment liquids (A-1) to (A-7), a printed material having excellent friction fastness can be produced, and the tactile sensation of the printed material is reduced. can be suppressed.
- a printed material for evaluation was produced by the same method as the method for producing a printed material for evaluation described in . 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 the treatment liquid (A-1). In each example, the discharge amount of the treatment liquid was set to the discharge amount shown in Table 3 below. Note that the ink discharge amount was unchanged at 20 g/m 2 .
- Example 1-12 Regarding the production of printed materials for evaluation in Examples 1 to 12, the above 1. was carried out except that the following points were changed.
- a printed object on which a solid image of ink was formed was produced by the same method as the method for producing the printed material for evaluation described in .
- 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 not filled with the treatment liquid. That is, the ejection amount of the treatment liquid was set to 0 g/m 2 and no treatment liquid was ejected from the treatment head. Note that the ink discharge amount was unchanged at 20 g/m 2 .
- the object to be printed on which the solid image of the ink was formed was impregnated with the treatment liquid (A-1), then removed from the treatment liquid (A-1) and lightly squeezed. Specifically, the printing target was narrowed down so that the pick-up rate was 100% and the coating amount of the treatment liquid (A-1) was 120 g/m 2 .
- the squeezed printing object was heated at 160° C. for 3 minutes to dry the ink and the treatment liquid to obtain a printed material for evaluation.
- the evaluation of the dry friction fastness was A for the printed material formed using the treatment liquid (A-1) with a discharge amount of 15 g/m 2 or more and 30 g/m 2 or less. there were. Therefore, by ejecting the inkjet treatment liquid of the present embodiment at an ejection amount of 15 g/m 2 or more and 30 g/m 2 or less, it is judged that a printed material having particularly excellent dry friction fastness can be produced.
- ⁇ Preparation of treatment liquid (C-1)> Except that 50 g of an aqueous sodium hydroxide solution, 570 g of ion-exchanged water, and 80 g of a surfactant (polyoxyethylene alkyl ether) were added and stirred and mixed in the preparation of the raw material emulsion B, the above 1.
- a treatment liquid (C-1) was obtained by the same method as the preparation method of the treatment liquid (A-4) described in .
- the average particle size of emulsified particles of the carboxy-modified silicone oil in the treatment liquid (C-1) was 102 nm.
- ⁇ Preparation of treatment liquid (C-2)> Except that 50 g of an aqueous sodium hydroxide solution, 590 g of ion-exchanged water, and 60 g of a surfactant (polyoxyethylene alkyl ether) were added and stirred and mixed in the preparation of raw material emulsion B, the above 1.
- a treatment liquid (C-2) was obtained by the same method as the preparation method of the treatment liquid (A-4) described in .
- the average particle size of emulsified particles of the carboxy-modified silicone oil in the treatment liquid (C-2) was 137 nm.
- ⁇ Preparation of treatment liquid (C-3)> Except that 50 g of an aqueous sodium hydroxide solution, 610 g of ion-exchanged water, and 40 g of a surfactant (polyoxyethylene alkyl ether) were added and stirred and mixed in the preparation of raw material emulsion B, the above 1.
- a treatment liquid (C-3) was obtained by the same method as the preparation method of the treatment liquid (A-4) described in .
- the average particle size of emulsified particles of the carboxy-modified silicone oil in the treatment liquid (C-3) was 189 nm.
- a treatment liquid (C-4) was obtained in the same manner as the preparation method of the treatment liquid (A-4) described in .
- the average particle size of emulsified particles of the carboxy-modified silicone oil in the treatment liquid (C-4) was 247 nm.
- the raw material emulsion used in the preparation of the treatment liquid (C-1) was used as the first raw material emulsion.
- the average particle size of the emulsified particles of the carboxy-modified silicone oil contained in this first raw material emulsion is 102 nm.
- a second raw material emulsion containing unmodified silicone oil was then prepared. Specifically, 300 g of unmodified silicone oil (specifically, dimethylpolysiloxane) (“KF96-3000cs” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 3,000 mm 2 /s, specific gravity: 0.97), 610 g of deionized water and 90 g of surfactant (polyoxyethylene alkyl ether) were placed in a beaker. Using a homogenizer ("Ultra Turrax T25" manufactured by IKA), the contents of the beaker were stirred at a rotation speed of 10000 rpm for 15 minutes and allowed to stand for 30 minutes.
- a homogenizer Ultra Turrax T25
- the content of the beaker was filtered through a 120-mesh stainless filter to obtain a second raw material emulsion containing undenatured silicone oil.
- the average particle size of emulsified particles of unmodified silicone oil contained in this second raw material emulsion was 115 nm.
- the average particle size of the emulsified particles in the treatment liquid (C-5) was 106 nm.
- ⁇ Preparation of treatment liquid (C-6)> The raw material emulsion used in the preparation of the treatment liquid (C-4) was used as the first raw material emulsion.
- the average particle size of the emulsified particles of the carboxy-modified silicone oil contained in this first raw material emulsion is 247 nm.
- a second raw material emulsion containing unmodified silicone oil was then prepared. Specifically, 300 g of unmodified silicone oil (specifically, dimethylpolysiloxane) (“KF96-3000cs” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 3,000 mm 2 /s, specific gravity: 0.97), 655 g of deionized water and 45 g of surfactant (polyoxyethylene alkyl ether) were placed in a beaker. Using a homogenizer ("Ultra Turrax T25" manufactured by IKA), the contents of the beaker were stirred at a rotation speed of 10000 rpm for 15 minutes and allowed to stand for 30 minutes.
- a homogenizer Ultra Turrax T25 manufactured by IKA
- the content of the beaker was filtered through a 120-mesh stainless filter to obtain a second raw material emulsion containing undenatured silicone oil.
- the average particle size of emulsified particles of unmodified silicone oil contained in this second raw material emulsion was 240 nm.
- 16.67 g of the first raw material emulsion and 16.67 g of the second raw material emulsion are mixed with 33.31 g of ion-exchanged water and 33.35 g of propylene glycol to obtain a treatment liquid (C-6 ).
- the average particle size of the emulsified particles in the treatment liquid (C-6) was 245 nm.
- ⁇ Preparation of treatment liquid (D-1)> Except that 50 g of an aqueous sodium hydroxide solution, 560 g of ion-exchanged water, and 90 g of a surfactant (polyoxyethylene alkyl ether) were added and stirred and mixed in the preparation of raw material emulsion B, the above 1.
- a treatment liquid (D-1) was obtained by the same method as the preparation method of the treatment liquid (A-4) described in .
- the average particle size of emulsified particles of the carboxy-modified silicone oil in the treatment liquid (D-1) was 75 nm.
- ⁇ Preparation of treatment liquid (D-2)> Except that 50 g of an aqueous sodium hydroxide solution and 650 g of ion-exchanged water were added and mixed by stirring without adding a surfactant in the preparation of the raw material emulsion B, the above 1.
- a treatment liquid (D-2) was obtained by the same method as the preparation method of the treatment liquid (A-4) described in .
- the average particle size of emulsified particles of the carboxy-modified silicone oil in the treatment liquid (D-2) was 323 nm.
- ⁇ Preparation of treatment liquid (D-3)> The raw material emulsion used in the preparation of the treatment liquid (D-1) was used as the first raw material emulsion.
- the average particle size of the emulsified particles of the carboxy-modified silicone oil contained in this first raw material emulsion is 75 nm.
- a second raw material emulsion containing unmodified silicone oil was then prepared. Specifically, 300 g of unmodified silicone oil (specifically, dimethylpolysiloxane) (“KF96-3000cs” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 3,000 mm 2 /s, specific gravity: 0.97), 580 g of deionized water and 120 g of surfactant (polyoxyethylene alkyl ether) were placed in a beaker. Using a homogenizer ("Ultra Turrax T25" manufactured by IKA), the contents of the beaker were stirred at a rotation speed of 10000 rpm for 15 minutes and allowed to stand for 30 minutes.
- a homogenizer Ultra Turrax T25 manufactured by IKA
- the content of the beaker was filtered through a 120-mesh stainless filter to obtain a second raw material emulsion containing undenatured silicone oil.
- the average particle size of emulsified particles of unmodified silicone oil contained in this second raw material emulsion was 86 nm.
- the average particle size of the emulsified particles in the treatment liquid (D-3) was 80 nm.
- the raw material emulsion used in the preparation of the treatment liquid (D-2) was used as the first raw material emulsion.
- the average particle size of the emulsified particles of the carboxy-modified silicone oil contained in this first raw material emulsion is 323 nm.
- a second raw material emulsion containing unmodified silicone oil was then prepared. Specifically, 300 g of unmodified silicone oil (specifically, dimethylpolysiloxane) (“KF96-3000cs” manufactured by Shin-Etsu Chemical Co., Ltd., viscosity: 3,000 mm 2 /s, specific gravity: 0.97), 680 g of deionized water and 20 g of surfactant (polyoxyethylene alkyl ether) were placed in a beaker. Using a homogenizer ("Ultra Turrax T25" manufactured by IKA), the contents of the beaker were stirred at a rotation speed of 10000 rpm for 15 minutes and allowed to stand for 30 minutes.
- a homogenizer Ultra Turrax T25
- the content of the beaker was filtered through a 120-mesh stainless filter to obtain a second raw material emulsion containing undenatured silicone oil.
- the average particle size of emulsified particles of unmodified silicone oil contained in this second raw material emulsion was 350 nm.
- the average particle size of the emulsified particles in the treatment liquid (D-4) (average particle size of the emulsified particles during mixing) was 340 nm.
- a printed material for evaluation was produced by the same method as the method for producing a printed material for evaluation described in . Specifically, the first ink chamber of the first cartridge is filled with the above ink a, and the second ink chamber of the second cartridge is filled with treatment liquid (C-1) to treatment liquid (C-1) shown in Table 4 below. C-6) and one of the treatment liquids (D-1) to (D-4) was filled.
- the method for preparing the ink to be used is the same as in 1. above. is the same as the method described in In each example and each comparative example, the discharge amount of the treatment liquid was set to 10 g/m 2 . The amount of ink discharged was 20 g/m 2 .
- a specific method for evaluating ejection properties is as follows. First, using the ejection evaluator, the camera position was adjusted so that three nozzles could be seen in one field of view. Next, the discharge of the treatment liquid was started, and it was visually confirmed through the image of the camera whether or not the treatment liquid was normally discharged for one minute. After one minute had passed, the number of nozzles that were normally ejecting the treatment liquid was counted.
- the nozzles that normally ejected the processing liquid refer to the nozzles that did not normally eject the processing liquid (nozzles that did not eject the processing liquid straight, nozzles that did not eject the processing liquid, nozzle from which the processing liquid overflowed).
- Table 4 summarizes the type of treatment liquid used in each example and each comparative example (average particle size of emulsified particles, type of silicone oil, etc.), as well as the evaluation results of friction fastness and ejection property.
- the average particle size of the emulsified particles of silicone oil (the average particle size when two emulsified particles are mixed when two types of emulsified particles are contained) is in the range of 100 nm or more and 250 nm or less.
- the dry friction fastness and the wet friction fastness were both evaluated as A or B. Met.
- the average particle diameter of the emulsified particles of the silicone oil in the treatment liquid is 100 nm or more and 250 nm or less, the ejection property of the treatment liquid is good. Prints with excellent dry and wet rub fastnesses could be produced.
- the treatment liquid, inkjet printing apparatus, and inkjet printing method according to the present disclosure can be used to form a printed material.
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Abstract
Description
前記乳化粒子の平均粒子径は100nm以上250nm以下である。
以下、本開示の第1実施形態に係るインクジェット用処理液(以下、処理液とも言う)を説明する。第1実施形態に係る処理液は、乳化粒子と、水性媒体とを含有する。乳化粒子は、処理液の水性媒体中において、分散している。すなわち、第1実施形態に係る処理液は、エマルションであり、より具体的には、水中油滴(O/W)型エマルションである。
処理液に含有される乳化粒子は、シリコーンオイルを含有する。シリコーンオイルは、イオン性基含有シリコーンオイルを少なくとも含むことが好ましい。イオン性基含有シリコーンオイルを含むことによって、特に湿潤摩擦堅ろう度により優れた捺染物を作製することができる。シリコーンオイルは、イオン性基含有シリコーンオイル以外のシリコーンオイル(以下、その他のシリコーンオイルと記載することがある)であってもよい。あるいは、シリコーンオイルは、イオン性基含有シリコーンオイルおよびその他のシリコーンオイルの両方を含有してもよい。この場合、1つの乳化粒子にイオン性基含有シリコーンオイルおよびその他のシリコーンオイルの両方が含有されていてもよい。あるいは、処理液に含有される乳化粒子が2種以上であり、例えば、第1乳化粒子にイオン性基含有シリコーンオイルが含有されており、第2乳化粒子にその他のシリコーンオイルが含有されていてもよい。乳化粒子がシリコーンオイル、特にイオン性基含有シリコーンオイルを少なくとも含むことで、次の第1~第4の利点が得られる。
イオン性基含有シリコーンオイルは、変性シリコーンオイルであり、より具体的には、イオン性基変性シリコーンオイルである。イオン性基変性シリコーンオイルとしては、例えば、側鎖にイオン性基が導入された変性シリコーンオイル、および末端基にイオン性基が導入された変性シリコーンオイルが挙げられる。
処理液に含まれるシリコーンオイルは、その他のシリコーンオイルのみであってもよい。あるいは、イオン性基含有シリコーンオイルに加えてその他のシリコーンオイルをさらに含有することで、シリコーンオイルの粘度を調整できる。その他のシリコーンオイルとしては、例えば、非変性シリコーンオイルが挙げられる。より具体的には、ジメチルポリシロキサンが挙げられる。
処理液に含有される水性媒体は、水を主成分とする媒体である。水性媒体は、溶媒として機能してもよく、分散媒として機能してもよい。水性媒体の具体例としては、水、または水と極性溶媒との混合液が挙げられる。水性媒体に含有される極性溶媒の例としては、メタノール、エタノール、イソプロピルアルコール、ブタノール、およびメチルエチルケトンが挙げられる。水性媒体における水の含有率は、90質量%以上であることが好ましく、100質量%であることが特に好ましい。水性媒体の含有率は、処理液の質量に対して、50質量%以上90質量%以下であることが好ましく、55質量%以上70質量%以下であることがより好ましい。
処理液は、必要に応じて、乳化粒子および水性媒体以外の成分(以下、その他の成分と記載することがある)を含有してもよい。その他の成分としては、酸、塩基、ポリオール、および分散剤が挙げられる。
シリコーンオイルとしてイオン性基含有シリコーンオイルが少なくとも含まれ、当該イオン性基含有シリコーンオイルが、アニオン性基を有する場合には、処理液は、酸を含有することが好ましい。酸によってアニオン性基の電離が促され、水性媒体中で、イオン性基含有シリコーンオイルを含有する乳化粒子が好適に分散する。酸としては、例えば、強酸、および弱酸が挙げられる。強酸としては、例えば、塩酸、パラトルエンスルホン酸、および硫酸が挙げられる。弱酸としては、例えば、安息香酸、および酢酸が挙げられる。シリコーンオイルが有するアニオン性基の電離を促すために、酸としては、強酸が好ましい。具体的には、塩酸、パラトルエンスルホン酸、または硫酸がより好ましい。処理液が酸を含有する場合、濃度1mol/Lの酸の量に換算した酸の含有率は、処理液の質量に対して、1質量%以上5質量%以下であることが好ましい。
シリコーンオイルとしてイオン性基含有シリコーンオイルが少なくとも含まれ、当該イオン性基含有シリコーンオイルが、カチオン性基を有する場合には、処理液は、塩基を含有することが好ましい。塩基によってカチオン性基の電離が促され、水性媒体中で、イオン性基含有シリコーンオイルを含有する乳化粒子が好適に分散する。塩基としては、例えば、水酸化ナトリウムが挙げられる。処理液が塩基を含有する場合、濃度1mol/Lの塩基の量に換算した塩基の含有率は、処理液の質量に対して、1質量%以上5質量%以下であることが好ましい。
処理液がポリオールを含有することで、処理液の粘度が好適に調整される。ポリオールとしては、ジオールまたはトリオールが好ましい。ジオールとしては、例えば、グリコール化合物が挙げられる。より具体的には、エチレングリコール、プロピレングリコール、ジエチレングリコール、トリエチレングリコ-ル、およびテトラエチレングリコールが挙げられる。トリオールとしては、例えば、グリセリンが挙げられる。処理液がポリオールを含有する場合、ポリオールの含有率は、処理液の質量に対して、10質量%以上40質量%以下であることが好ましく、15質量%以上35質量%以下であることがより好ましい。
分散剤としては、例えば、界面活性剤、樹脂分散剤、および多糖類が挙げられる。但し、処理液が分散剤を含有することなく、処理液中で乳化粒子が分散していることが好ましい。既に述べたように、シリコーンオイル、特にイオン性基含有シリコーンオイルを含有する乳化粒子は、水性媒体中でより好適に分散する。このため、分散剤が含有されない場合であっても、乳化粒子の分散状態を好適に維持できる。分散剤は、親水性基を有することが多い。親水性基を有する分散剤が処理液に含有されないことで、処理液により処理された捺染物の湿潤摩擦堅ろう度がより向上する。
処理液の製造方法の一例を説明する。ホモジナイザーを用いて、シリコーンオイルと、水性媒体と、必要に応じて添加される成分(例えば、酸または塩基、およびポリオール)とを混合して乳化させる。このようにして、水性媒体中に、シリコーンオイルを含有する乳化粒子を分散させて、処理液を得る。
次に、図1を参照しながら、本開示の第2実施形態に係るインクジェット捺染装置10を説明する。なお、理解しやすくするために、図1は、それぞれの構成要素を主体に模式的に示している。図示された各構成要素の大きさ、個数等は、適宜変更されてもよい。図1は、第2実施形態に係るインクジェット捺染装置の一例であるインクジェット捺染装置10の要部を示す側面図である。図1に示すインクジェット捺染装置10は、フラットベッド式のインクジェット捺染装置である。
次に、引き続き図1を参照しながら、本開示の第3実施形態に係るインクジェット捺染方法を説明する。第3実施形態に係るインクジェット捺染方法は、第1実施形態に係る処理液を用いて、捺染対象Pの画像形成領域に、画像を形成する。また、第3実施形態に係るインクジェット捺染方法は、第2実施形態に係るインクジェット捺染装置10を用いて、捺染対象Pの画像形成領域に、画像を形成する。第3実施形態に係るインクジェット捺染方法は、第1実施形態に係る処理液を用いるため、第1実施形態で述べた理由と同じ理由により、摩擦堅ろう度に優れた捺染物を作製でき、捺染物の触感の低下を抑制できる。さらに、第1実施形態に係る処理液は、処理ヘッドからの吐出性に優れているため、本第3実施形態に係るインクジェット捺染方法によれば、これらの効果を確実に発揮させることができる。
次に、上記第2実施形態および上記第3実施形態において使用されるインクについて説明する。インクは、例えば、顔料と、水性媒体とを含有する。インクは、必要に応じて、界面活性剤、ポリオール、およびバインダー樹脂粒子からなる群から選択される少なくとも1種をさらに含有してもよい。
顔料は、例えば、水性媒体に分散して存在する。画像濃度、色相、および色の安定性に優れたインクを得る観点から、顔料のD50は、30nm以上250nm以下であることが好ましく、70nm以上160nm以下であることがより好ましい。
インクに含有される水性媒体は、第1実施形態で述べた処理液に含有される水性媒体と同義である。水性媒体の含有率は、インクの質量に対して、5質量%以上70質量%以下であることが好ましく、40質量%以上60質量%以下であることがより好ましい。
インクが界面活性剤を含有することで、捺染対象に対するインクの濡れ性が向上する。界面活性剤としては、例えば、アニオン界面活性剤、カチオン界面活性剤、非イオン界面活性剤、および両性界面活性剤が挙げられる。インクに含有される界面活性剤は、非イオン界面活性剤であることが好ましい。非イオン界面活性剤は、アセチレングリコール構造を有する界面活性剤であることが好ましく、アセチレンジオールエチレンオキサイド付加物であることがより好ましい。界面活性剤のHLB値は、3以上20以下であることが好ましく、6以上16以下であることがより好ましく、7以上10以下であることがさらに好ましい。界面活性剤のHLB値は、例えば、グリフィン法により式「HLB値=20×(親水部の式量の総和)/分子量」から算出される。画像のオフセットを抑制しつつ、画像濃度を向上させるために、界面活性剤の含有率は、インクの質量に対して、0.1質量%以上5.0質量%以下であることが好ましく、0.5質量%以上2.0質量%以下であることがより好ましい。
インクがポリオールを含有することで、インクの粘度が好適に調整される。インクに含有されるポリオールは、第1実施形態で述べた処理液に含有されるポリオールと同義である。インクがポリオールを含有する場合、インクの粘度を好適に調整するために、ポリオールの含有率は、インクの質量に対して、5質量%以上60質量%以下であることが好ましく、20質量%以上50質量%以下であることがより好ましい。
バインダー樹脂粒子は、水性媒体中に分散した状態で存在する。バインダー樹脂粒子は、捺染対象と顔料とを結合させるバインダーとして機能する。このため、インクがバインダー樹脂粒子を含有することで、顔料の定着性に優れた捺染物を得ることができる。
インクは、必要に応じて、公知の添加剤(より具体的には、溶解安定剤、乾燥防止剤、酸化防止剤、粘度調整剤、pH調整剤、および防カビ剤等)をさらに含有してもよい。
インクは、例えば、攪拌機を用いて、顔料と、水性媒体と、必要に応じて添加される成分(例えば、界面活性剤、ポリオール、およびバインダー樹脂粒子)とを混合することにより製造される。混合時間は、例えば、1分以上30分以下である。
本開示の第一の局面に係るインクジェット用処理液は、シリコーンオイルを含有する乳化粒子と、水性媒体とを含有し、
前記乳化粒子の平均粒子径は100nm以上250nm以下である。
前記第1乳化粒子の平均粒子径は100nm以上250nm以下であり、
前記第2乳化粒子の平均粒子径は100nm以上250nm以下であってもよい。
前記第2乳化粒子の平均粒子径は100nm以上160nm以下であってもよい。
前記処理液は、本開示の第一の局面に係るインクジェット用処理液である。
前記処理液は、本開示の第一の局面に係るインクジェット用処理液である。
本試験では、捺染物作製時の処理液の吐出量を20g/m2に設定し、処理液中のシリコーンオイルの種類とその含有率および乳化粒子の平均粒子径を変えながら各種捺染物を作製した。その後、作製した各種捺染物の摩擦堅ろう度および触感の低下の抑制を評価した。
本評価試験に用いた処理液(A-1)~処理液(A-7)および処理液(B-1)は、以下に記す方法で作製した。なお、シリコーンオイルの含有率は、小数第1位を四捨五入することにより、算出した。
まず、処理液(A-1)に含まれる原料エマルションAを作製した。具体的には、300gのアミノ変性シリコーンオイル(信越化学工業株式会社製「KF-864」、粘度:1,700mm2/s、比重:0.98、官能基当量:3,800g/mol)、600gのイオン交換水、および100gの塩酸(濃度:1mol/L)を、ビーカーに入れた。ホモジナイザー(IKA社製「ウルトラタラックスT25」)を用いて、回転速度10000rpmで15分間、ビーカーの内容物を攪拌し、30分間静置した。次いで、120メッシュのステンレスフィルターで、ビーカーの内容物をろ過し、原料エマルションAを得た。原料エマルションAには、アミノ変性シリコーンオイルの乳化粒子が分散していた。原料エマルションAに含有される乳化粒子の平均粒子径は、150nmであった。
処理液(A-3)の作製では、上記のように作製した原料エマルションAを用いた。具体的には、15.00gの原料エマルションA(アミノ変性シリコーンオイルの含有率:30質量%、アミノ変性シリコーンオイルの含有量:4.50g)、50.00gのイオン交換水、および35.00gのプロピレングリコールを混合して、処理液(A-2)を得た。処理液(A-2)において、アミノ変性シリコーンオイルの含有率は、5質量%であった。
処理液(A-3)の作製では、上記のように作製した原料エマルションAを用いた。具体的には、50.00gの原料エマルションA(アミノ変性シリコーンオイルの含有率:30質量%、アミノ変性シリコーンオイルの含有量:15.00g)、35.00gのイオン交換水、および15.00gのプロピレングリコールを混合して、処理液(A-3)を得た。処理液(A-3)において、アミノ変性シリコーンオイルの含有率は、15質量%であった。
まず、処理液(A-4)に含まれる原料エマルションBを作製した。具体的には、300gのカルボキシ変性シリコーンオイル(信越化学工業株式会社製「X-22-3701E」、粘度:2,000mm2/s、比重:0.98、官能基当量:4,000g/mol)、600gのイオン交換水、および100gの水酸化ナトリウム水溶液(濃度:1mol/L)をビーカーに入れた。ホモジナイザー(IKA社製「ウルトラタラックスT25」)を用いて、回転速度10000rpmで15分間、ビーカーの内容物を攪拌し、30分間静置した。次いで、120メッシュのステンレスフィルターで、ビーカーの内容物をろ過し、原料エマルションBを得た。原料エマルションBには、カルボキシ変性シリコーンオイルの乳化粒子が分散していた。原料エマルションBに含有される乳化粒子の平均粒子径は、120nmであった。
まず、処理液(A-5)に含まれる原料エマルションCを作製した。具体的には、300gのアミノ変性シリコーンオイル(信越化学工業株式会社製「KF-877」、粘度:5,700mm2/s、比重:0.98、官能基当量:5,200g/mol)、600gのイオン交換水、および100gの塩酸(濃度:1mol/L)をビーカーに入れた。ホモジナイザー(IKA社製「ウルトラタラックスT25」)を用いて、回転速度10000rpmで15分間、ビーカーの内容物を攪拌し、30分間静置した。次いで、120メッシュのステンレスフィルターで、ビーカーの内容物をろ過し、原料エマルションCを得た。原料エマルションCには、アミノ変性シリコーンオイルの乳化粒子が分散していた。原料エマルションCに含有される乳化粒子の平均粒子径は、200nmであった。
まず、処理液(A-6)に含まれる原料エマルションDを作製した。具体的には、180gの非変性シリコーンオイル(具体的には、ジメチルポリシロキサン)(信越化学工業株式会社製「KF96-3000cs」、粘度:3,000mm2/s、比重:0.97)、および120gのフェノール変性シリコーンオイル(信越化学工業株式会社製「KF2201」、粘度:97m2/s、比重:0.99、官能基当量:1,474g/mol)を混合し、粘度1,000mm2/sの混合物MDを得た。300gの混合物MD、600gのイオン交換水、および100gの水酸化ナトリウム水溶液(濃度1mol/L)をビーカーに入れた。ホモジナイザー(IKA社製「ウルトラタラックスT25」)を用いて、回転速度10000rpmで15分間、ビーカーの内容物を攪拌し、30分間静置した。次いで、120メッシュのステンレスフィルターで、ビーカーの内容物をろ過し、原料エマルションDを得た。原料エマルションDには、非変性シリコーンオイルとフェノール変性シリコーンオイルとを含有する乳化粒子が分散していた。原料エマルションDに含有される乳化粒子の平均粒子径は、160nmであった。
まず、処理液(A-7)に含まれる原料エマルションEを作製した。具体的には、180gの非変性シリコーンオイル(信越化学工業株式会社製「KF96-3000cs」、粘度:3,000mm2/s、比重:0.97)、および120gのシラノール変性シリコーンオイル(信越化学工業株式会社製「KF9701」、粘度:60mm2/s、比重:0.977、官能基当量:1,500g/mol)を混合し、粘度1,200mm2/sの混合物MEを得た。300gの混合物ME、600gのイオン交換水、および100gの水酸化ナトリウム水溶液(濃度1mol/L)をビーカーに入れた。ホモジナイザー(IKA社製「ウルトラタラックスT25」)を用いて、回転速度10000rpmで15分間、ビーカーの内容物を攪拌し、30分間静置した。次いで、120メッシュのステンレスフィルターで、ビーカーの内容物をろ過し、原料エマルションEを得た。原料エマルションEには、非変性シリコーンオイルとシラノール変性シリコーンオイルとを含有する乳化粒子が分散していた。原料エマルションEに含有される乳化粒子の平均粒子径は、220nmであった。
まず、処理液(B-1)に含まれる原料エマルションFを作製した。具体的には、300gの非変性シリコーンオイル(信越化学工業株式会社製「KF-96-3000cs」、粘度:3,000mm2/s、比重:0.97)、600gのイオン交換水、および100gの塩酸(濃度1mol/L)をビーカーに入れた。ホモジナイザー(IKA社製「ウルトラタラックスT25」)を用いて、回転速度10000rpmで15分間、ビーカーの内容物を攪拌したところ、平均粒子径が1μm以上である乳化粒子しか作製できなかった。また、攪拌後に、ビーカーの内容物を30分間静置したところ、水相と油相とが分離してしまい、原料エマルションFを作製することができなかった。このように、原料エマルションFを作製できなかったことから、処理液(B-1)の作製は行わなかった。また、処理液(B-1)の作製を行っていないことから、処理液(B-1)に対する評価も行わなかった。
原料エマルション中の乳化粒子の平均粒子径およびシリコーンオイルの粘度は、以下に述べる方法によって測定した。
乳化粒子の平均粒子径は、レーザー回折式粒度分布測定装置(マルバーン社製「ゼータサイザーナノZS」)を用いて、ISO 13321:1996(Particle size analysis-Photon correlation spectroscopy)に記載の方法に準拠して測定した。乳化粒子の平均粒子径の測定には、処理液または原料エマルション(異なる2種の原料エマルションを混合する場合)を水で1000倍に希釈した測定試料を用いた。なお、原料エマルションに含有される乳化粒子の平均粒子径と、処理液に含有される乳化粒子の平均粒子径とは、互いにほぼ同一となる。
シリコーンオイルの粘度は、温度25℃の環境下で、JIS Z8803:2011(液体の粘度測定方法)に記載の方法に準拠して測定した。シリコーンオイルの粘度の測定には、JIS Z8803:2011の「6.2.3 ウベローデ粘度計」に記載のウベローデ粘度計を用いた。
作製した各処理液を用いて、各種捺染物の摩擦堅ろう度および触感の低下の抑制を評価した。具体的には、評価用インクおよび当該評価用インクと各処理液とを用いて評価用捺染物を作製し、その摩擦堅ろう度および触感の低下の抑制を評価した。以下、評価用インクの作製方法、評価用捺染物の作製方法および各種評価方法の詳細を述べる。
処理液の評価に使用するためのインクaおよびbを、以下に示す方法により作製した。
攪拌羽根を備えた容量1Lの3つ口フラスコに、125gのイオン交換水、および2gのノニオン界面活性剤(日信化学工業株式会社製「サーフィノール(登録商標)440」、内容:アセチレングリコールエチレンオキサイド付加物)を入れた。フラスコの内容物を攪拌しながら、165gのプロピレングリコール、100gの黒色顔料分散液(山陽色素株式会社製「AE2078F」、内容:C.I.Pigment Black 7、固形分濃度:20質量%)、および108gのバインダー樹脂粒子分散液(第一工業製薬株式会社「スーパーフレックス470」、内容:ポリウレタン分散液、固形分濃度:38質量%)を、フラスコ内に順に添加した。フラスコの内容物を10分間攪拌して、インクaを得た。
攪拌羽根を備えた容量1Lの3つ口フラスコに、140gのイオン交換水、および2gのノニオン界面活性剤(日信化学工業株式会社製「サーフィノール(登録商標)440」、内容:アセチレングリコールエチレンオキサイド付加物)を入れた。フラスコの内容物を攪拌しながら、225gのプロピレングリコール、83gの黒色顔料分散液(大日精化工業株式会社製「ACAK1」、内容:C.I.Pigment Black 7、固形分濃度:15質量%、)、および50gのバインダー樹脂粒子分散液(宇部興産株式会社製「Eternacoll(登録商標)UW-1527F」、内容:ポリウレタン分散液、固形分濃度:40質量%)を、フラスコ内に順に添加した。フラスコの内容物を10分間攪拌して、インクbを得た。
後の表2に示すインクおよび処理液を用いて、評価用捺染物を作製した。例えば、表2の実施例1-1の評価には、処理液(A-1)およびインクaを使用した。
JIS L-0849:2013(摩擦に対する染色堅ろう度試験方法)に記載の摩擦試験機II形(学振形)法の乾燥試験および湿潤試験に従って、評価用捺染物に形成されたソリッド画像を、摩擦用白綿布を用いて摩擦した。JIS L-0801:2011(染色堅ろう度試験方法通則)の箇条10(染色堅ろう度の判定)に記載の「変退色の判定基準」に準拠し、摩擦後の摩擦用白綿布の着色の程度を評価した。摩擦用白綿布の着色の程度は、9段階(汚染の程度が大きい順番に、1級、1~2級、2級、2~3級、3級、3~4級、4級、4~5級、および5級)で判定した。摩擦堅ろう度は、摩擦用白綿布の着色の程度が小さい(5級に近い)ほど良好である。摩擦試験後の摩擦用白綿布の着色の程度から、下記基準に従って、乾燥摩擦堅ろう度、および湿潤摩擦堅ろう度を評価した。なお、上記乾燥試験の判定結果を、乾燥摩擦堅ろう度とし、上記湿潤試験の判定結果を、湿潤摩擦堅ろう度とした。評価がAおよびBである場合を合格とし、評価がCである場合を不合格とした。判定された摩擦堅ろう度、およびその評価結果を、後の表2にまとめて示す。
評価A:乾燥摩擦堅ろう度が、4級以上である。
評価B:乾燥摩擦堅ろう度が、3~4級である。
評価C:乾燥摩擦堅ろう度が、3級以下である。
評価A:湿潤摩擦堅ろう度が、3級以上である。
評価B:湿潤摩擦堅ろう度が、2~3級である。
評価C:湿潤摩擦堅ろう度が、2級以下である。
未使用の捺染対象を経糸に沿って(長さ方向に)に二つ折りにし、折り目における下側の生地と上側の生地との間の距離(ループ高さ)を測定した。測定された未使用の捺染対象のループ高さを、捺染前のループ高さとした。次に、評価用捺染物のソリッド画像が形成された領域を、経糸に沿って(長さ方向に)に二つ折りにし、ループ高さを測定した。測定された評価用捺染物のループ高さを、捺染後のループ高さとした。式「ループ高さの変化率=100×捺染後のループ高さ/捺染前のループ高さ」に従って、捺染前後におけるループ高さの変化率(単位:%)を算出した。ループ高さの変化率が低い程、捺染後も捺染対象が硬くならずふくらまないため、捺染物の触感の低下が抑制されていることを示す。ループ高さの変化率から、下記基準に従って、捺染物の触感の低下が抑制されているか否かを評価した。評価がAおよびBである場合を合格とし、評価がCである場合を不合格とした。測定されたループ高さの変化率、および触感の低下の抑制に関する評価結果を、後の表2にまとめて示す。
評価A:ループ高さの変化率が、125%以下である。
評価B:ループ高さの変化率が、125%超130%以下である。
評価C:ループ高さの変化率が、130%超である。
上記表2に示すように、処理液(A-1)~処理液(A-7)を用いて作製された捺染物に関し、乾燥摩擦堅ろう度、湿潤摩擦堅ろう度および触感の低下の抑制の評価は、インクの種類に拘わらず、いずれもAまたはBであった。従って、処理液(A-1)~処理液(A-7)を包含する本実施形態におけるインクジェット用処理液によれば、摩擦堅ろう度に優れた捺染物を作製でき、捺染物の触感の低下を抑制できると判断される。
本試験では、インクジェット用処理液として前述した処理液(A-1)を用い、処理液の吐出量を変動させながら各種評価用捺染物を作製し、当該評価用捺染物の摩擦堅ろう度および触感の低下の抑制について評価した。
実施例1-1、実施例1-9~実施例1-11および実施例1-8の評価用捺染物の作製に関し、以下の点を変更したこと以外は、上記1.で述べた評価用捺染物の作製方法と同じ方法により、評価用捺染物を作製した。具体的には、第1カートリッジの第1インク室に後の表3に示すインクを充填し、第2カートリッジの第2インク室には処理液(A-1)を充填した。各々の実施例において、処理液の吐出量を、後の表3に示す吐出量に設定した。なお、インクの吐出量は、20g/m2のまま変更しなかった。
実施例1-12の評価用捺染物の作製に関し、以下の点を変更したこと以外は、上記1.で述べた評価用捺染物の作製方法と同じ方法により、インクのソリッド画像が形成された捺染対象を作製した。具体的には、第1カートリッジの第1インク室に後の表3に示すインクを充填し、第2カートリッジの第2インク室には処理液を充填しなかった。すなわち、処理液の吐出量を、0g/m2に設定し、処理液を処理ヘッドから吐出させなかった。なお、インクの吐出量は、20g/m2のまま変更しなかった。
実施例1-1、実施例1-9~実施例1-12および実施例1-8の処理液(A-1)を用いて作製した評価用捺染物に対し、上記1.で述べた摩擦堅ろう度の評価と同じ方法、および上記1.で述べた触感の低下の抑制に関する評価と同じ方法により、評価を実施した。評価結果を、以下の表3に示す。なお、実施例1-1および実施例1-8で使用する処理液(A-1)を用いて作製した評価用捺染物に対する評価結果は、上記表2で既に示しているが、理解を助けるために、以下の表3で再度示す。
上記表3に示すように、10g/m2以上120g/m2以下の吐出量(塗布量を含む)で作製された捺染物に関し、乾燥摩擦堅ろう度、湿潤摩擦堅ろう度および触感の低下の抑制の評価は、いずれもAまたはBであった。従って、10g/m2以上120g/m2以下の広い範囲の吐出量(塗布量を含む)で本実施形態におけるインクジェット用処理液を吐出または塗布することにより、摩擦堅ろう度に優れた捺染物を作製でき、捺染物の触感の低下を抑制できると判断される。
本試験では、乳化粒子の平均粒子を変えながら各種捺染物を作製した。その後、作製した各種捺染物の摩擦堅ろう度を評価した。同時に、各処理液中の乳化粒子の平均粒子径に応じた処理液のノズルからの吐出性についても評価した。
本試験では、カルボキシ変性シリコーンオイルの乳化粒子の平均粒子径、または、カルボキシ変性シリコーンオイルの乳化粒子と非変性シリコーンオイルの乳化粒子の両方の平均粒子径を様々な値に変動させた処理液を用いた。以下に、本試験で用いた処理液(C-1)~処理液(C-6)および処理液(D-1)~処理液(D-4)の詳細な作製方法を述べる。
原料エマルションBの作製の際に、50gの水酸化ナトリウム水溶液と、570gのイオン交換水と、80gの界面活性剤(ポリオキシエチレンアルキルエーテル)とを加えて攪拌混合したこと以外は、上記1.で述べた処理液(A-4)の作製方法と同じ方法により、処理液(C-1)を得た。処理液(C-1)のカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、102nmであった。
原料エマルションBの作製の際に、50gの水酸化ナトリウム水溶液と、590gのイオン交換水と、60gの界面活性剤(ポリオキシエチレンアルキルエーテル)とを加えて攪拌混合したこと以外は、上記1.で述べた処理液(A-4)の作製方法と同じ方法により、処理液(C-2)を得た。処理液(C-2)のカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、137nmであった。
原料エマルションBの作製の際に、50gの水酸化ナトリウム水溶液と、610gのイオン交換水と、40gの界面活性剤(ポリオキシエチレンアルキルエーテル)とを加えて攪拌混合したこと以外は、上記1.で述べた処理液(A-4)の作製方法と同じ方法により、処理液(C-3)を得た。処理液(C-3)のカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、189nmであった。
原料エマルションBの作製の際に、50gの水酸化ナトリウム水溶液と、630gのイオン交換水と、20gの界面活性剤(ポリオキシエチレンアルキルエーテル)とを加えて攪拌混合したこと以外は、上記1.で述べた処理液(A-4)の作製方法と同じ方法により、処理液(C-4)を得た。処理液(C-4)のカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、247nmであった。
処理液(C-1)の作製で用いた原料マルションを、第1の原料マルションとした。この第1の原料エマルションに含有されるカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、102nmである。
処理液(C-4)の作製で用いた原料マルションを、第1の原料マルションとした。この第1の原料エマルションに含有されるカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、247nmである。
原料エマルションBの作製の際に、50gの水酸化ナトリウム水溶液と、560gのイオン交換水と、90gの界面活性剤(ポリオキシエチレンアルキルエーテル)とを加えて攪拌混合したこと以外は、上記1.で述べた処理液(A-4)の作製方法と同じ方法により、処理液(D-1)を得た。処理液(D-1)のカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、75nmであった。
原料エマルションBの作製の際に、50gの水酸化ナトリウム水溶液と、650gのイオン交換水とを加え、界面活性剤は加えずに攪拌混合したこと以外は、上記1.で述べた処理液(A-4)の作製方法と同じ方法により、処理液(D-2)を得た。処理液(D-2)のカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、323nmであった。
処理液(D-1)の作製で用いた原料マルションを、第1の原料マルションとした。この第1の原料エマルションに含有されるカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、75nmである。
処理液(D-2)の作製で用いた原料マルションを、第1の原料マルションとした。この第1の原料エマルションに含有されるカルボキシ変性シリコーンオイルの乳化粒子の平均粒子径は、323nmである。
実施例2-1~実施例2-6および比較例2-1~比較例2-4の捺染物の作製に関し、以下の点を変更したこと以外は、上記1.で述べた評価用捺染物の作製方法と同じ方法により、評価用捺染物を作製した。具体的には、第1カートリッジの第1インク室には上記のインクaを充填し、第2カートリッジの第2インク室には後の表4に示す処理液(C-1)~処理液(C-6)および処理液(D-1)~処理液(D-4)のいずれかを充填した。使用するインクの作製方法は、上記1.で述べた方法と同じである。各実施例および各比較例において、処理液の吐出量は、10g/m2に設定した。なお、インクの吐出量は、20g/m2とした。
実施例2-1~実施例2-6および比較例2-1~比較例2-4の捺染物に対し、上記1.で述べた摩擦堅ろう度の評価と同じ方法により、評価を行った。各実施例および各比較例の捺染物の評価結果は、後の表4においてまとめて示す。
処理液の吐出性の評価は、カメラの映像によってノズルからの1滴ずつの処理液の吐出が確認できる吐出評価機(京セラ株式会社製、「KJ4B」)を使用して実施した。当該吐出評価機における条件は以下の通りに設定した。
(吐出評価機の条件)
ヘッド温度:32℃
ヘッドからの処理液の吐出量:10g/m2
駆動周波数:30kHz
(判定基準)
A:36
B:34~35
C:33以下
上記表4に示す通り、シリコーンオイルの乳化粒子の平均粒子径(2種の乳化粒子を含有する場合は2つの乳化粒子を混合した際の平均粒子径)が100nm以上250nm以下の範囲内である処理液(C-1)~処理液(C-6)を使用した実施例2-1~実施例2-6に関しては、乾燥摩擦堅ろう度および湿潤摩擦堅ろう度の評価は、いずれもAまたはBであった。一方、乳化粒子の平均粒子径が75nmの処理液(D-1)を使用した比較例2-1の捺染物、および、乳化粒子の平均粒子径が75nmと86nmの処理液(D-4)を使用した比較例2-3の捺染物に関しては、乾燥摩擦堅ろう度および湿潤摩擦堅ろう度、特に湿潤摩擦堅ろう度の評価が悪かった。これは、処理液の親水性が高くなり、捺染物の耐水性が悪くなったためと想定される。乳化粒子の平均粒子径が323nmの処理液(D-2)を使用した比較例2-2の捺染物、および、乳化粒子の平均粒子径が323と350の処理液(D-4)を使用した比較例2-4の捺染物に関しては、吐出性の評価が顕著に悪かった。これは、粒子径が大きい場合、メニスカスが不安定になるためと想定される。
1a:第1記録ヘッド
1b:第2記録ヘッド
1c:第3記録ヘッド
1d:第4記録ヘッド
2:処理ヘッド
3:載置台
10:インクジェット捺染装置
P:捺染対象
Claims (9)
- シリコーンオイルを含有する乳化粒子と、水性媒体とを含有し、
前記乳化粒子の平均粒子径は100nm以上250nm以下である、インクジェット用処理液。 - 前記乳化粒子の平均粒子径は100nm以上160nm以下である、請求項1に記載のインクジェット用処理液。
- 前記乳化粒子が、第1乳化粒子と、前記第1乳化粒子とは平均粒子径が異なる第2乳化粒子と、を含み、
前記第1乳化粒子の平均粒子径は100nm以上250nm以下であり、
前記第2乳化粒子の平均粒子径は100nm以上250nm以下である、請求項1に記載のインクジェット用処理液。 - 前記第1乳化粒子の平均粒子径は100nm以上160nm以下であり、
前記第2乳化粒子の平均粒子径は100nm以上160nm以下である、請求項3に記載のインクジェット用処理液。 - 前記第1乳化粒子の平均粒子径と前記第2乳化粒子の平均粒子径との差が0nm以上30nm以下である、請求項3または4に記載のインクジェット用処理液。
- 前記シリコーンオイルは、イオン性基含有シリコーンオイルを少なくとも含む、請求項1~5のいずれか1項に記載のインクジェット用処理液。
- 捺染用である、請求項1~6のいずれか1項に記載のインクジェット用処理液。
- 捺染対象の画像形成領域にインクを吐出する記録ヘッドと、前記捺染対象の少なくとも前記画像形成領域に処理液を吐出する処理ヘッドとを備え、
前記処理液は、請求項1~7のいずれか1項に記載のインクジェット用処理液である、インクジェット捺染装置。 - 捺染対象の画像形成領域に記録ヘッドからインクを吐出するインク吐出工程と、前記捺染対象の少なくとも前記画像形成領域に処理ヘッドから処理液を吐出する処理工程とを含み、
前記処理液は、請求項1~7のいずれか1項に記載のインクジェット用処理液である、インクジェット捺染方法。
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JP7342306B2 (ja) | 2023-09-11 |
JP2023158032A (ja) | 2023-10-26 |
EP4357428A1 (en) | 2024-04-24 |
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