WO2023013448A1 - Inkjet head cleaning solution - Google Patents

Inkjet head cleaning solution Download PDF

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Publication number
WO2023013448A1
WO2023013448A1 PCT/JP2022/028498 JP2022028498W WO2023013448A1 WO 2023013448 A1 WO2023013448 A1 WO 2023013448A1 JP 2022028498 W JP2022028498 W JP 2022028498W WO 2023013448 A1 WO2023013448 A1 WO 2023013448A1
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WO
WIPO (PCT)
Prior art keywords
inkjet head
cleaning liquid
head cleaning
metal particles
acid
Prior art date
Application number
PCT/JP2022/028498
Other languages
French (fr)
Japanese (ja)
Inventor
尚史 ▲高▼林
Original Assignee
株式会社ダイセル
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Publication of WO2023013448A1 publication Critical patent/WO2023013448A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/165—Preventing or detecting of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/24—Hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/22—Organic compounds
    • C11D7/26—Organic compounds containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/50—Solvents

Definitions

  • the present disclosure relates to an inkjet head cleaning liquid. More specifically, the present disclosure relates to a cleaning liquid used for cleaning an inkjet head of an inkjet recording device.
  • This application claims the priority of Japanese Patent Application No. 2021-127344 filed in Japan on August 3, 2021, the content of which is incorporated herein.
  • An inkjet recording device is equipped with an ink-absorbing sponge, micro-channels in the inkjet head, ejection holes, etc. inside the filter or cartridge. For this reason, when printing by ejecting inkjet ink using an inkjet recording apparatus, it is necessary for the inkjet to pass through a narrow space in the inkjet recording apparatus.
  • an inkjet ink containing metal particles contains metal particles of several nanometers to submicrometers and a solvent.
  • Metal particles tend to agglomerate due to the speed difference.
  • Aggregated metal particles are likely to be adsorbed on the inner walls of channels, etc., and metal particle aggregates adsorbed on the inner walls significantly reduce the ejection stability under conditions of continuous and intermittent ejection of ink containing metal particles. was there.
  • the inside of the inkjet head and the like is cleaned using a cleaning liquid for inkjet recording devices.
  • a cleaning liquid for inkjet recording devices for example, those disclosed in Patent Documents 1 to 4 are known as cleaning liquids for such an inkjet recording apparatus.
  • the inkjet ink must be removed and the cleaning liquid must be supplied again into the inkjet head for cleaning. If the inkjet head needs to be washed again, the washing takes time and effort.
  • an object of the present disclosure is to provide an inkjet head cleaning liquid that enables checking of the clogged state of the ejection port without actually attempting to eject the inkjet ink after cleaning the inkjet head.
  • the inventors of the present disclosure have made intensive studies to solve the above problems, and as a result, according to the inkjet head cleaning liquid that contains an organic solvent and can be ejected from the inkjet head and printed on the substrate, the inkjet head can be After cleaning, it was found that the clogged state of the ejection port can be confirmed without actually trying to eject the inkjet ink.
  • the present disclosure relates to those completed based on these findings.
  • the present disclosure provides an inkjet head cleaning liquid that contains an organic solvent and can be ejected from an inkjet head and printed onto a substrate.
  • the inkjet head cleaning liquid is preferably used for cleaning an inkjet head that ejects inkjet ink containing metal particles.
  • the inkjet head cleaning liquid preferably contains a dispersant for dispersing the metal particles.
  • the dispersant is preferably a compound having at least one functional group selected from the group consisting of carboxy groups, amino groups, sulfo groups, and thiol groups.
  • the metal particles preferably contain surface-modified metal particles having a structure in which the surfaces of the metal particles are coated with an organic protective agent, and the dispersant preferably has a functional group possessed by the organic protective agent.
  • the inkjet head cleaning liquid preferably has a viscosity of 2.5 mPa ⁇ s or more at 23°C.
  • the inkjet head cleaning liquid preferably has a surface tension of 25.8° or higher.
  • the organic solvent preferably contains hydrocarbon and alcohol.
  • the above hydrocarbon preferably contains a hydrocarbon having an alicyclic ring.
  • the above alcohol preferably contains an alcohol having an alicyclic ring.
  • the inkjet head cleaning liquid preferably contains a component having a melting point of 20°C or higher.
  • the present disclosure provides a method for checking the clogged state of the ejection port by ejecting the above-described inkjet head cleaning liquid from the inkjet head to be cleaned and printing on a substrate to check the clogged state of the ejection port.
  • the inkjet head cleaning liquid of the present disclosure after cleaning the inkjet head, it is possible to check whether or not the ejection port is clogged without actually trying to eject the inkjet ink. Therefore, cleaning of the inkjet head is facilitated, and cleaning time can be saved.
  • the inkjet head cleaning liquid of the present disclosure is a liquid for cleaning at least an inkjet head in an inkjet recording apparatus.
  • the inkjet head includes ejection openings (nozzles) for ejecting inkjet ink.
  • the inkjet ink is preferably an inkjet ink containing metal particles from the viewpoint of excellent cleaning performance with the inkjet head cleaning liquid. That is, the inkjet head cleaning liquid is preferably used for cleaning an inkjet head that ejects an inkjet ink containing metal particles.
  • the inkjet head cleaning liquid of the present disclosure contains at least an organic solvent. Only one kind of the organic solvent may be used, or two or more kinds thereof may be used.
  • each organic solvent does not need to be liquid at room temperature.
  • the organic solvent is a mixture of two or more, the mixture is preferably liquid at room temperature.
  • each organic solvent is liquid at room temperature.
  • the organic solvent alone preferably has a melting point of less than 20°C, more preferably less than 10°C.
  • the organic solvent preferably does not have a functional group that interacts with the particles contained in the inkjet ink.
  • the organic solvent preferably does not have a carboxy group, an amino group, a sulfo group, or a thiol group.
  • organic solvent examples include those known or commonly used for cleaning liquids of inkjet recording devices, such as hydrocarbons; alcohols; chain or cyclic amides such as dimethylformamide (DMF), dimethylacetamide and lactam; sulfoxides such as; chloroform, dichloromethane, dichloroethane, carbon tetrachloride, chlorobenzene, trifluoromethylbenzene and other halogenated hydrocarbons; Cyclic ethers; linear or cyclic esters such as ethyl acetate, butyl acetate and lactone; linear ketones such as methyl ethyl ketone (MEK) and methyl isobutyl ketone; and nitriles such as acetonitrile.
  • hydrocarbons such as hydrocarbons; alcohols; chain or cyclic amides such as dimethylformamide (DMF), dimethylacetamide and lactam
  • sulfoxides such as; chloroform, dichlorome
  • the above organic solvent is appropriately selected according to the type of inkjet ink used in the inkjet recording device to be cleaned.
  • a hydrocarbon is preferable from the viewpoint of being excellent in washing properties of an inkjet ink containing metal particles.
  • alcohol is preferable from the viewpoint of increasing the surface tension and viscosity of the cleaning liquid to improve the ejection performance from the ejection port of the inkjet head. For this reason, it is particularly preferred to include both hydrocarbons and alcohols.
  • the above hydrocarbons include linear or branched aliphatic hydrocarbons, hydrocarbons having an alicyclic ring, and hydrocarbons having an aromatic ring. Also, the hydrocarbons may be either saturated or unsaturated. Among them, the hydrocarbon is preferably a linear or branched aliphatic hydrocarbon or a hydrocarbon having an alicyclic ring, more preferably having an alicyclic ring, from the viewpoint of better cleaning performance of an inkjet ink containing metal particles. is a hydrocarbon.
  • linear or branched aliphatic hydrocarbons examples include hexane, heptane, octane, pentane, hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, hexadecane, and unsaturated compounds thereof. Saturated or unsaturated linear aliphatic hydrocarbons and the like are included.
  • the number of carbon atoms in the linear or branched aliphatic hydrocarbon is preferably 6 or more, more preferably 10 or more, and still more preferably 12 or more, from the viewpoint of excellent washability and suppression of drying of the inkjet head. is.
  • the alicyclic ring in the hydrocarbon having the alicyclic ring includes, for example, monocyclic hydrocarbon rings such as cyclohexane and cyclohexene; bicyclic hydrocarbon rings such as pinene, norbornene and decahydronaphthalene; dicyclopentane, dicyclopentene, tricyclic or higher hydrocarbon rings such as dicyclopentadiene;
  • hydrocarbons having an alicyclic ring include monocyclic hydrocarbons such as cyclohexane and methylcyclohexane; and bicyclic hydrocarbons such as hydrogenated naphthalene such as decahydronaphthalene.
  • the number of carbon atoms in the hydrocarbon having an alicyclic ring is preferably 6 or more, and more preferably 10 or more, from the viewpoint of better cleaning performance and suppression of drying of the inkjet head.
  • hydrocarbons having aromatic rings examples include aromatic hydrocarbons such as benzene, toluene, and xylene.
  • Examples of the above alcohols include linear or branched alcohols, alcohols having an alicyclic ring, and alcohols having an aromatic ring. Also, the alcohol may be either saturated or unsaturated. Among these alcohols, alcohols having a cyclic structure, such as alcohols having an alicyclic ring and alcohols having an aromatic ring, are preferable from the viewpoint of excellent cleaning properties for inkjet inks containing metal particles.
  • the valence of the alcohol is not particularly limited, it is preferably 1 to 2, more preferably 1.
  • linear or branched monohydric alcohol examples include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-pentanol, n-hexanol, n- octanol, 2-octanol, glycol ether and the like.
  • linear or branched dihydric alcohol include (poly)alkylene glycols such as ethylene glycol, diethylene glycol, triethylene glycol and polyethylene glycol.
  • the number of carbon atoms in the linear or branched alcohol is preferably 4 or more, more preferably 6 or more, from the viewpoint of suppressing drying of the inkjet head.
  • Examples of the alicyclic ring in the alcohol having the alicyclic ring include those exemplified and explained as the alicyclic ring in the hydrocarbon having the alicyclic ring.
  • Specific examples of alcohols having an alicyclic ring include monocyclic alcohols such as cyclohexanol, methylcyclohexanol, cyclohexanemethanol, cyclohexaneethanol, and 3-cyclohexene-1-methanol (tetrahydrobenzyl alcohol). is mentioned.
  • the number of carbon atoms in the alcohol having an alicyclic ring is preferably 6 or more from the viewpoint of suppressing drying of the inkjet head.
  • alcohols having aromatic rings include phenol, benzyl alcohol, o-cresol, m-cresol, and p-cresol.
  • the number of carbon atoms in the aromatic ring-containing hydrocarbon is preferably 6 or more from the viewpoint of suppressing drying of the inkjet head.
  • the content of the organic solvent is preferably 50% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, and particularly preferably 95% by mass, relative to the total amount (100% by mass) of the inkjet head cleaning liquid. % or more.
  • the content is 50% by mass or more, the cleaning properties and dischargeability of the cleaning liquid are excellent.
  • the content of hydrocarbons and/or alcohols in the organic solvent is preferably within the above range.
  • the mass ratio of the hydrocarbon to the alcohol is preferably 30:70 to 90:10, more preferably 40:60 to 80: 20, more preferably 55:45 to 70:30.
  • the inkjet head cleaning liquid preferably contains a dispersant for dispersing the metal particles.
  • a dispersant for dispersing the metal particles.
  • the dispersant is preferably an organic compound.
  • the dispersant preferably has a functional group. That is, the dispersant is preferably a compound having a functional group.
  • the functional group include a carboxy group, an amino group, a sulfo group, and a thiol group (mercapto group).
  • a dispersing agent having a functional group is excellent in dispersibility of fine particles (especially nano-sized metal particles) and further excellent in cleaning properties.
  • Examples of the dispersant having a carboxyl group include carboxylic acids and amino acids.
  • carboxylic acid examples include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, lauric acid, myristic acid, palmitic acid, margaric acid, stearic acid, and the like.
  • aliphatic saturated monocarboxylic acids oleic acid, linoleic acid, linolenic acid, arachidonic acid, docosahesaenoic acid, eicosapentaenoic acid and other aliphatic unsaturated monocarboxylic acids; oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid
  • Aromatic carboxylic acids such as benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, trimesic acid, hemimellitic acid, and pyromellitic acid; maleic acid, fumaric acid, cyclopentanecarboxylic acid etc.
  • Carboxylic acids having a hydroxy group include lactic acid, malic acid, citric acid, salicylic acid and the like.
  • As the carboxylic acid compound an aliphatic monocarboxylic acid having 2 to 20 carbon atoms is preferred.
  • amino acids examples include arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, and valine.
  • Examples of the dispersant having an amino group include amines, the above amino acids, and aminoalcohols.
  • amines having an aliphatic hydrocarbon group on the nitrogen atom of an amino group include amines having an aliphatic hydrocarbon group on the nitrogen atom of an amino group (aliphatic hydrocarbon amines), amines having an alicyclic hydrocarbon group (alicyclic hydrocarbon amines), and aromatic hydrocarbons.
  • amines having a group aromatic hydrocarbon amines
  • amines having a heterocyclic ring heterocyclic amines
  • the hydrocarbon group and heterocyclic ring in the amine may have a substituent.
  • aliphatic hydrocarbon amine examples include an amino group and an amine having a linear aliphatic hydrocarbon group on the nitrogen atom of the amino group (linear aliphatic hydrocarbon amine), an amino group and the nitrogen of the amino group Amines having branched chain aliphatic hydrocarbon groups on atoms (branched chain aliphatic hydrocarbon amines) can be mentioned.
  • linear aliphatic hydrocarbon amines examples include ethylamine, n-propylamine, n-butylamine, n-pentylamine, n-hexylamine, n-heptylamine, n-octylamine, n-nonylamine, n -decylamine, n-undecylamine, n-dodecylamine, n-tridecylamine, n-tetradecylamine, n-pentadecylamine, n-hexadecylamine, n-heptadecylamine, n-octadecylamine, etc.
  • primary monoamines such as saturated linear aliphatic hydrocarbon amines, unsaturated linear aliphatic hydrocarbon amines such as oleylamine; N,N-diethylamine, N,N-di(n-propyl)amine, N, N-di(n-butyl)amine, N,N-di(n-pentyl)amine, N,N-di(n-hexyl)amine, N,N-di(n-peptyl)amine, N,N- di(n-octyl)amine, N,N-di(n-nonyl)amine, N,N-di(n-decyl)amine, N,N-di(n-undecyl)amine, N,N-di( n-dodecyl)amine, N-methyl-N-(n-propyl)amine, N-ethyl-N-(n-propyl)amine, N-(n-propyl)-
  • One amino group and one or more direct atoms on the nitrogen atom of the amino group such as secondary monoamines; tertiary monoamines such as triethylamine, tri(n-butyl)amine, tri(n-hexyl)amine, etc.
  • a monoamine having a chain aliphatic hydrocarbon group can be mentioned.
  • branched-chain aliphatic hydrocarbon amine examples include isobutylamine, sec-butylamine, tert-butylamine, isopentylamine, tert-pentylamine, isohexylamine, 2-ethylhexylamine, tert-octylamine and the like.
  • primary amine secondary amine
  • secondary amine such as N,N-diisobutylamine, N,N-diisopentylamine, N,N-diisohexylamine, N,N-di(2-ethylhexyl)amine
  • examples of the amine include amines having two or more amino groups such as diamine.
  • examples of the diamine include ethylenediamine, N,N-dimethylethylenediamine, N,N'-dimethylethylenediamine, N,N-diethylethylenediamine, N,N'-diethylethylenediamine, 1,3-propanediamine, 2,2- Dimethyl-1,3-propanediamine, N,N-dimethyl-1,3-propanediamine, N,N'-dimethyl-1,3-propanediamine, N,N-diethyl-1,3-propanediamine, N , N′-diethyl-1,3-propanediamine, 1,4-butanediamine, N,N-dimethyl-1,4-butanediamine, N,N′-dimethyl-1,4-butanediamine, N,N -diethyl-1,4-butanediamine, N,N'-diethyl-1,4-butanediamine, 1,5
  • Examples of the aromatic hydrocarbon amine include benzylamine.
  • Examples of the heterocyclic amines include piperidine and morpholine.
  • amino alcohols examples include diethanolamine, monoethanolamine, aminoethylethanolamine, n-methylethanolamine, 3-amino-1-propanol, and the like.
  • Dispersants having a sulfo group include, for example, benzenesulfonic acid, p-toluenesulfonic acid, xylenesulfonic acid, naphthalenesulfonic acid, decylbenzenesulfonic acid, dodecylbenzenesulfonic acid, pentadecylbenzenesulfonic acid, methanesulfonic acid, ethanesulfonic acid, 1-propanesulfonic acid, 1-butanesulfonic acid, 1-hexanesulfonic acid, 1-heptanesulfonic acid, 1-octanesulfonic acid, 1-nonanesulfonic acid, 1-decanesulfonic acid, 1-dodecanesulfonic acid acid, vinylsulfonic acid, styrenesulfonic acid, allylsulfonic acid, ethanedisulfonic acid, butanedisulfonic acid
  • Dispersants having a mercapto group include, for example, methanethiol, methanedithiol, ethanethiol, 1,1-ethanedithiol, 1,2-ethanedithiol, 2-hydroxyethanethiol, propanethiol, 2-propanethiol, 2 -propenethiol, 1,1-propanedithiol, 1,2-propanedithiol, 1,3-propanedithiol, butanethiol, 2-butanethiol, 1,4-butanedithiol, 2,3-butanedithiol, 2-methyl propanethiol, 2-methyl-2-propanethiol, 3-hydroxy-2-butanethiol, pentanethiol, 2-pentanethiol, 3-pentanethiol, cyclopentanethiol, 2-methylbutanethiol, 3-methylbutanethiol, 3-methyl-2-butanethiol
  • the number of carbon atoms in the dispersant is not particularly limited, but is preferably 4-24, more preferably 6-22, still more preferably 10-20. When the number of carbon atoms is within the above range, the dispersibility of the metal particles is better, and the washability is more excellent.
  • the functional group is preferably selected as appropriate according to the type of metal particles that can be contained in the inkjet ink.
  • the functional group is the same as the functional group of the organic protective agent, from the viewpoint of excellent dispersibility of the metal particles and excellent cleaning properties. is preferably
  • the number of carbon atoms in the dispersant is preferably greater than the number of carbon atoms in the organic protective agent that protects the surfaces of the metal particles.
  • amines are preferred as the dispersant, and among these, saturated or unsaturated aliphatic hydrocarbon monoamine compounds having 8 or more carbon atoms are preferred, more preferably straight-chain fatty acids having 8 or more carbon atoms. group hydrocarbon monoamines.
  • the amino group of the dispersing agent is easily adsorbed on the surface of the metal particles, and at that time, it is easy to secure the space between the metal particles, so the effect of preventing the aggregation of the metal particles is improved. Better dispersibility and washability.
  • a saturated or unsaturated aliphatic hydrocarbon monoamine compound having up to 18 carbon atoms is generally preferable in consideration of availability.
  • linear aliphatic hydrocarbon monoamines having 8 to 18 carbon atoms such as octylamine, nonylamine, decylamine, undecylamine, dodecylamine and oleylamine are preferably used.
  • the content of the dispersant is preferably 0.1 to 10% by mass, more preferably 0.3 to 8% by mass, and still more preferably 0.5%, relative to the total amount (100% by mass) of the inkjet head cleaning liquid. ⁇ 6% by mass.
  • the content is 0.1% by mass or more, the metal particles are more excellent in dispersibility.
  • the content is 10% by mass or less, the ink-jet head is more excellent in washability and dischargeability.
  • the inkjet head cleaning liquid preferably contains a component having a melting point of 20° C. or higher.
  • a component having a melting point of 20°C or higher may be referred to as a "high melting point component”. Since the high-melting-point component does not easily volatilize when the cleaning liquid is ejected from the ejection port and applied to the substrate, it is easy to check the ejection properties of the cleaning liquid by blending the high-melting-point component into the inkjet head cleaning liquid. Become. Only one kind of the high-melting-point component may be used, or two or more kinds thereof may be used.
  • the melting point of the high-melting-point component is preferably 100°C or lower, more preferably 60°C or lower, and even more preferably 40°C or lower.
  • the high melting point component may be a component corresponding to the organic solvent or the dispersant, or may be a component other than these.
  • the dispersant is preferably the high melting point component from the viewpoint of blending the high melting point component while maintaining high detergency and dischargeability.
  • the content of the high melting point component is preferably 0.1 to 10% by mass, more preferably 0.3 to 8% by mass, and still more preferably 0.1% by mass to the total amount (100% by mass) of the inkjet head cleaning liquid. It is 5 to 6% by mass. When the content is 0.1% by mass or more, it is easier to check the dischargeability of the cleaning liquid. When the content is 10% by mass or less, the proportion of the solvent having a relatively low melting point is increased, resulting in superior cleaning performance of the inkjet head.
  • the inkjet head cleaning liquid may contain components other than the components described above.
  • the other components include water, surfactants, pH adjusters, rust inhibitors, antiseptics, anti-mold agents, antioxidants, anti-reduction agents, evaporation accelerators, chelating agents, acids, and the like. be done. Only one kind of the other components may be used, or two or more kinds thereof may be used.
  • the content of the other components in the inkjet head cleaning liquid is, for example, 10% by mass or less, preferably 5% by mass or less, and more preferably 1% by mass or less.
  • the inkjet head cleaning liquid preferably has a viscosity at 23°C of 2.5 mPa ⁇ s or more, more preferably 2.8 mPa ⁇ s or more, and still more preferably 3.0 mPa ⁇ s or more.
  • the viscosity is 2.5 mPa ⁇ s or more, the cleaning liquid is easily ejected as droplets when ejected from the ejection port, and it is possible to more easily check the cleaning performance of the inkjet head and clogging of the ejection port.
  • the inkjet head cleaning liquid preferably has a surface tension of 25.8° or more, more preferably 26.0° or more.
  • the surface tension is a value measured by the Wilhelmy method.
  • the inkjet head cleaning liquid can be ejected as droplets from the ejection port of the inkjet head to be cleaned and printed on the substrate. In this way, the inkjet head cleaning liquid can be discharged from the discharge ports without dripping and can be printed on the base material. be able to. Therefore, after cleaning the inkjet head, it is possible to check whether the cleaning of the inkjet head is sufficient without actually trying to eject the inkjet ink.
  • the substrate is not particularly limited as long as it can receive droplets of the inkjet head cleaning liquid ejected from the ejection port of the inkjet head. substances.
  • the inkjet head cleaning liquid of the present disclosure is preferably used for cleaning an inkjet head that ejects inkjet ink containing metal particles.
  • metal particles known or commonly used ones used in metal paints can be used, but metal fine particles (microparticles, nanoparticles, etc.) are preferred.
  • surface-modified metal particles having a structure in which the surfaces of the metal particles are coated with an organic protective agent are preferable. That is, the metal particles are preferably surface-modified fine metal particles. Only one kind of the metal particles may be used, or two or more kinds thereof may be used.
  • the primary particle size (average primary particle diameter) of the fine particles is preferably less than 1000 ⁇ m, more preferably less than 1000 nm, still more preferably 100 nm or less, even more preferably 80 nm or less, even more preferably 70 nm or less, and particularly preferably is 60 nm or less.
  • the average primary particle size may be, for example, 0.5 nm or more, or 1 nm or more.
  • metals that make up the metal particles include conductive metals such as gold, silver, copper, nickel, aluminum, rhodium, cobalt, ruthenium, platinum, palladium, chromium, and indium.
  • the organic protective agent is not particularly limited, and includes known or commonly used organic protective agents used as protective agents (stabilizers) for metal particles.
  • the organic protective agent include organic compounds having functional groups.
  • the functional group include those exemplified and explained as the functional group that the dispersant may have. Among these functional groups, a carboxy group, an amino group, a sulfo group, and a thiol group (mercapto group) are preferable, and an amino group is more preferable. Only one type of the organic protective agent may be used, or two or more types may be used.
  • organic protective agent having the functional group examples include those exemplified and explained as the dispersant above.
  • the number of carbon atoms in the organic protective agent is not particularly limited, it is preferably 4-24, more preferably 6-22, still more preferably 10-20.
  • the number of carbon atoms is 4 or more, the length of one molecule of the organic protective agent tends to be long, the distance between the metal particles can be maintained at a certain level or more, and the metal particles are dispersed in the inkjet ink. tend to be better.
  • the number of carbon atoms is 24 or less, the boiling point of the organic protective agent tends to be low, and the organic protective agent tends to volatilize at low temperatures during firing of the metal particles, which tends to facilitate low-temperature firing of the metal particles. be.
  • Examples 1-3 and Comparative Examples 1-3 Each component was mixed in the compounding amounts shown in Table 1 to prepare an inkjet head cleaning liquid.
  • the compounding amount of each component in the table indicates parts by mass.
  • the cleaning liquid of Comparative Example 1 cannot be ejected from the inkjet head to print on the substrate, and when the inkjet head is cleaned using the cleaning liquid of Comparative Example 1, the inkjet ink must be actually ejected thereafter. It is not possible to check whether the outlet is blocked.
  • the cleaning liquids of Comparative Examples 2 and 3 were inferior in cleanability.
  • Appendix 2 The inkjet head cleaning liquid according to Appendix 1, which is used for cleaning an inkjet head that ejects an inkjet ink containing metal particles.
  • Appendix 3 The inkjet head cleaning liquid according to Appendix 2, wherein the metal particles contain surface-modified metal particles having a structure in which the surfaces of the metal particles are coated with an organic protective agent.
  • the organic protective agent is an organic compound having a functional group (in particular, at least one functional group selected from the group consisting of a carboxy group, an amino group, a sulfo group, and a thiol group). 3.
  • Appendix 5 The inkjet head cleaning liquid according to Appendix 3 or 4, wherein the number of carbon atoms in the organic protective agent is 4 to 24 (preferably 6 to 22, more preferably 10 to 20).
  • the average primary particle diameter of the metal particles is less than 1000 ⁇ m (preferably less than 1000 nm, more preferably 100 nm or less, still more preferably 80 nm or less, even more preferably 70 nm or less, particularly preferably 60 nm or less). 6.
  • Appendix 7 The inkjet head cleaning liquid according to any one of Appendices 2 to 6, wherein the metal particles have an average primary particle size of 0.5 nm or more (preferably 1 nm or more).
  • [Appendix 8] Appendices 2 to 7, containing a dispersant for dispersing the metal particles, wherein the number of carbon atoms in the dispersant is greater than the number of carbon atoms in the organic protective agent that protects the surface of the metal particles.
  • [Appendix 9] The inkjet head cleaning liquid according to any one of Appendices 2 to 8, which contains a dispersant for dispersing the metal particles, and the dispersant has a functional group possessed by the organic protective agent.
  • Appendix 10 The inkjet head cleaning liquid according to any one of Appendices 1 to 7, which contains a dispersant for dispersing the metal particles.
  • Appendices 8 to 10 wherein the dispersant is a compound having a functional group (in particular, at least one functional group selected from the group consisting of a carboxy group, an amino group, a sulfo group, and a thiol group).
  • the inkjet head cleaning liquid according to any one of.
  • Appendix 12 The inkjet head cleaning liquid according to any one of Appendices 8 to 11, wherein the dispersant has 4 to 24 carbon atoms (preferably 6 to 22, more preferably 10 to 20).
  • the dispersant is an amine (preferably a saturated or unsaturated aliphatic hydrocarbon monoamine compound having 8 or more carbon atoms, more preferably a linear aliphatic hydrocarbon monoamine having 8 or more carbon atoms, further preferably is a linear aliphatic hydrocarbon monoamine having 8 to 18 carbon atoms).
  • the content of the dispersant is 0.1 to 10% by mass (preferably 0.3 to 8% by mass, more preferably 0.5 to 6% by mass) relative to the total amount of the inkjet head cleaning liquid. ), the inkjet head cleaning liquid according to any one of Appendices 8 to 13.
  • Appendix 15 The inkjet head cleaning liquid according to any one of Appendices 8 to 14, wherein the dispersant has a melting point of 20° C. or higher.
  • [Appendix 16] The organic solvent of Appendices 1 to 15, wherein the organic solvent does not have a functional group (preferably a carboxy group, an amino group, a sulfo group, and a thiol group) that interacts with the particles contained in the inkjet ink.
  • the inkjet head cleaning liquid according to any one of the above.
  • [Appendix 17] The inkjet head cleaning liquid according to any one of Appendices 1 to 16, wherein the organic solvent contains a hydrocarbon.
  • the hydrocarbon contains a linear or branched aliphatic hydrocarbon or a hydrocarbon having an alicyclic ring (preferably a hydrocarbon having an alicyclic ring). washing liquid.
  • the content of the organic solvent is 50% by mass or more (preferably 80% by mass, more preferably 90% by mass or more, and still more preferably 95% by mass or more) relative to the total amount of the inkjet head cleaning liquid.
  • 26. The inkjet head cleaning liquid according to any one of Appendices 1 to 25.
  • Appendix 27 The inkjet head cleaning liquid according to any one of Appendices 1 to 26, wherein the organic solvent contains a hydrocarbon and an alcohol.
  • the weight ratio of the hydrocarbon to the alcohol is 30:70 to 90:10 (preferably 40:60 to 80:20, more preferably 55:45 to 70:30). Inkjet head cleaning liquid.
  • Appendix 29 The inkjet head cleaning liquid according to any one of Appendices 1 to 28, which contains a component having a melting point of 20° C. or higher.
  • Appendix 30 The inkjet head cleaning liquid according to Appendix 29, wherein the melting point of the component having a melting point of 20° C. or higher is 100° C. or lower (preferably 60° C. or lower, more preferably 40° C. or lower).
  • Appendix 31 The content of the component having a melting point of 20°C or higher is 0.1 to 10% by mass (preferably 0.3 to 8% by mass, more preferably 0% by mass) relative to the total amount of the inkjet head cleaning liquid. .5 to 6% by mass).
  • Appendix 32 The inkjet according to any one of Appendices 1 to 31, wherein the viscosity at 23° C. is 2.5 mPa ⁇ s or more (preferably 2.8 mPa ⁇ s or more, more preferably 3.0 mPa ⁇ s or more). head cleaning liquid.
  • Appendix 33 The inkjet head cleaning liquid according to any one of Appendices 1 to 32, which has a surface tension of 25.8° or more (preferably 26.0° or more).
  • Appendix 34 A method for confirming a clogged state of an ejection port by ejecting the inkjet head cleaning liquid according to any one of Appendices 1 to 33 from an inkjet head to be cleaned and printing on a substrate to check the state of clogging of the ejection port.
  • the inkjet head cleaning liquid of the present disclosure after cleaning the inkjet head, it is possible to check the clogged state of the ejection port without actually trying to eject the inkjet ink, and the cleaning of the inkjet head becomes easy, and the cleaning time is reduced. can save money. Therefore, the present disclosure has industrial applicability.

Abstract

The present invention provides an inkjet head cleaning solution which makes it possible to check the clogging state of an ejection port without actually ejecting an inkjet ink therethrough after the cleaning of an inkjet head.　An inkjet head cleaning solution according to the present disclosure contains an organic solvent, and is able to be ejected from an inkjet head, thereby being printed onto a base material. It is preferable that this inkjet head cleaning solution is used for cleaning of an inkjet head which ejects an inkjet ink that contains metal particles.

Description

インクジェットヘッド洗浄液Inkjet head cleaning liquid
　本開示はインクジェットヘッド洗浄液に関する。本開示は、より具体的には、インクジェット記録装置のインクジェットヘッドを洗浄するのに用いる洗浄液に関する。本願は、２０２１年８月３日に日本に出願した特願２０２１－１２７３４４号の優先権を主張し、その内容をここに援用する。 The present disclosure relates to an inkjet head cleaning liquid. More specifically, the present disclosure relates to a cleaning liquid used for cleaning an inkjet head of an inkjet recording device. This application claims the priority of Japanese Patent Application No. 2021-127344 filed in Japan on August 3, 2021, the content of which is incorporated herein.
　インクジェット記録装置は、フィルターやカートリッジ内に、インク吸収スポンジ、インクジェットヘッド中のマイクロ流路、吐出用の穴などを備える。このため、インクジェット記録装置を用いてインクジェットインクを吐出してプリントする際は、インクジェット記録装置内の狭い空間をインクジェットが通過する必要がある。 An inkjet recording device is equipped with an ink-absorbing sponge, micro-channels in the inkjet head, ejection holes, etc. inside the filter or cartridge. For this reason, when printing by ejecting inkjet ink using an inkjet recording apparatus, it is necessary for the inkjet to pass through a narrow space in the inkjet recording apparatus.
　例えば、金属粒子を含有するインクジェットインクは、数ｎｍ～サブμｍ程度の金属粒子および溶媒を含んでおり、このようなインクがインクジェット記録装置内の狭い空間を通過した場合、溶媒と金属粒子との速度差によって金属粒子が凝集しやすい。凝集した金属粒子は流路等の内壁に吸着しやすく、内壁に吸着した金属粒子凝集物は、金属粒子含有インクの連続的、間欠的な吐出条件下での吐出安定性を著しく低下させるという問題があった。 For example, an inkjet ink containing metal particles contains metal particles of several nanometers to submicrometers and a solvent. Metal particles tend to agglomerate due to the speed difference. Aggregated metal particles are likely to be adsorbed on the inner walls of channels, etc., and metal particle aggregates adsorbed on the inner walls significantly reduce the ejection stability under conditions of continuous and intermittent ejection of ink containing metal particles. was there.
　上記金属粒子凝集物を除去するために、インクジェット記録装置用の洗浄液を用いてインクジェットヘッド内等を洗浄することが行われる。このようなインクジェット記録装置用の洗浄液としては、例えば特許文献１～４に開示されたものが知られている。 In order to remove the metal particle aggregates, the inside of the inkjet head and the like is cleaned using a cleaning liquid for inkjet recording devices. For example, those disclosed in Patent Documents 1 to 4 are known as cleaning liquids for such an inkjet recording apparatus.
特開２０２０－１９３２３６号公報JP 2020-193236 A 特開２０１７－１６５８３０号公報JP 2017-165830 A 特開２０１７－６６２２８号公報JP 2017-66228 A 特開２００９－１０２４７５号公報JP 2009-102475 A
　しかしながら、特許文献１～４に開示の洗浄液では、洗浄性に優れる場合であっても、インクジェットヘッドの洗浄後、実際にインクジェットインクをインクジェットヘッドに装填し吐出口から吐出してみなければ吐出口の閉塞が解消されていることを確認することができなかった。具体的には、例えば、洗浄液により洗浄した際に吐出口から洗浄液が流れ出る場合であっても、洗浄液よりも流動性の低いインクジェットインクを吐出しようとした際にインクが液滴として吐出されない、互いに隣接する吐出口から流れ出る洗浄液どうしが合流してインクジェットヘッドから垂れ流れるため閉塞が解消していない吐出口が存在したとしても気づけない、といったことがある。そしてインクジェットインクの吐出を試みた段階で閉塞が解消していないことが発覚した場合、インクジェットインクを抜き取り、再度洗浄液をインクジェットヘッド内に供給して洗浄しなければならなかった。インクジェットヘッドの再洗浄が必要となると、洗浄に手間がかかったり、時間を要したりする。 However, even if the cleaning liquids disclosed in Patent Documents 1 to 4 are excellent in cleaning properties, after cleaning the inkjet head, the inkjet ink must be actually loaded into the inkjet head and ejected from the ejection port. It was not possible to confirm that the occlusion of the Specifically, for example, even if the cleaning liquid flows out from the ejection port when cleaning with the cleaning liquid, the ink is not ejected as droplets when an inkjet ink having a lower fluidity than the cleaning liquid is to be ejected. Since cleaning liquid flowing out from adjacent ejection ports joins together and drips from the inkjet head, even if there is an ejection port that is not clogged, it may not be noticed. If it is found that the clogging has not been resolved at the stage of trying to eject the inkjet ink, the inkjet ink must be removed and the cleaning liquid must be supplied again into the inkjet head for cleaning. If the inkjet head needs to be washed again, the washing takes time and effort.
　従って、本開示の目的は、インクジェットヘッドの洗浄後、実際にインクジェットインクの吐出を試みなくても吐出口の閉塞状況を確認することができるインクジェットヘッド洗浄液を提供することにある。 Therefore, an object of the present disclosure is to provide an inkjet head cleaning liquid that enables checking of the clogged state of the ejection port without actually attempting to eject the inkjet ink after cleaning the inkjet head.
　本開示の発明者は、上記課題を解決するため鋭意検討した結果、有機溶剤を含有し、インクジェットヘッドから吐出して基材へ印刷することが可能であるインクジェットヘッド洗浄液によれば、インクジェットヘッドの洗浄後、実際にインクジェットインクの吐出を試みなくても吐出口の閉塞状況を確認することができることを見出した。本開示は、これらの知見に基づいて完成されたものに関する。 The inventors of the present disclosure have made intensive studies to solve the above problems, and as a result, according to the inkjet head cleaning liquid that contains an organic solvent and can be ejected from the inkjet head and printed on the substrate, the inkjet head can be After cleaning, it was found that the clogged state of the ejection port can be confirmed without actually trying to eject the inkjet ink. The present disclosure relates to those completed based on these findings.
　すなわち、本開示は、有機溶剤を含有し、インクジェットヘッドから吐出して基材へ印刷することが可能である、インクジェットヘッド洗浄液を提供する。 That is, the present disclosure provides an inkjet head cleaning liquid that contains an organic solvent and can be ejected from an inkjet head and printed onto a substrate.
　上記インクジェットヘッド洗浄液は、金属粒子を含有するインクジェットインクを吐出するインクジェットヘッドの洗浄に用いることが好ましい。 The inkjet head cleaning liquid is preferably used for cleaning an inkjet head that ejects inkjet ink containing metal particles.
　上記インクジェットヘッド洗浄液は金属粒子を分散するための分散剤を含有することが好ましい。 The inkjet head cleaning liquid preferably contains a dispersant for dispersing the metal particles.
　上記分散剤は、カルボキシ基、アミノ基、スルホ基、およびチオール基からなる群より選択される少なくとも１種の官能基を有する化合物であることが好ましい。 The dispersant is preferably a compound having at least one functional group selected from the group consisting of carboxy groups, amino groups, sulfo groups, and thiol groups.
　上記金属粒子は金属粒子の表面が有機保護剤で被覆された構成を有する表面修飾金属粒子を含有し、上記分散剤は上記有機保護剤が有する官能基を有することが好ましい。 The metal particles preferably contain surface-modified metal particles having a structure in which the surfaces of the metal particles are coated with an organic protective agent, and the dispersant preferably has a functional group possessed by the organic protective agent.
　上記インクジェットヘッド洗浄液は２３℃における粘度が２．５ｍＰａ・ｓ以上であることが好ましい。 The inkjet head cleaning liquid preferably has a viscosity of 2.5 mPa·s or more at 23°C.
　上記インクジェットヘッド洗浄液は表面張力が２５．８°以上であることが好ましい。 The inkjet head cleaning liquid preferably has a surface tension of 25.8° or higher.
　上記有機溶剤は炭化水素およびアルコールを含有することが好ましい。 The organic solvent preferably contains hydrocarbon and alcohol.
　上記炭化水素は脂環を有する炭化水素を含有することが好ましい。 The above hydrocarbon preferably contains a hydrocarbon having an alicyclic ring.
　上記アルコールは脂環を有するアルコールを含有することが好ましい。 The above alcohol preferably contains an alcohol having an alicyclic ring.
　上記インクジェットヘッド洗浄液は融点が２０℃以上である成分を含有することが好ましい。 The inkjet head cleaning liquid preferably contains a component having a melting point of 20°C or higher.
　また、本開示は、上記インクジェットヘッド洗浄液を洗浄対象であるインクジェットヘッドより吐出して基材へ印刷することで吐出口の閉塞状況を確認する、吐出口閉塞状況の確認方法を提供する。 In addition, the present disclosure provides a method for checking the clogged state of the ejection port by ejecting the above-described inkjet head cleaning liquid from the inkjet head to be cleaned and printing on a substrate to check the clogged state of the ejection port.
　本開示のインクジェットヘッド洗浄液によれば、インクジェットヘッドの洗浄後、実際にインクジェットインクの吐出を試みなくても吐出口の閉塞状況を確認することができる。このため、インクジェットヘッドの洗浄が容易となり、洗浄時間を節約することができる。 According to the inkjet head cleaning liquid of the present disclosure, after cleaning the inkjet head, it is possible to check whether or not the ejection port is clogged without actually trying to eject the inkjet ink. Therefore, cleaning of the inkjet head is facilitated, and cleaning time can be saved.
［インクジェットヘッド洗浄液］
　本開示のインクジェットヘッド洗浄液は、インクジェット記録装置における少なくともインクジェットヘッドを洗浄するための液体である。上記インクジェットヘッドは、インクジェットインクを吐出する吐出口（ノズル）を備える。上記インクジェットインクとしては、上記インクジェットヘッド洗浄液による洗浄性に優れる観点から、金属粒子を含有するインクジェットインクであることが好ましい。すなわち、上記インクジェットヘッド洗浄液は、金属粒子を含有するインクジェットインクを吐出するインクジェットヘッドの洗浄に用いるためのものであることが好ましい。 [Inkjet head cleaning solution]
The inkjet head cleaning liquid of the present disclosure is a liquid for cleaning at least an inkjet head in an inkjet recording apparatus. The inkjet head includes ejection openings (nozzles) for ejecting inkjet ink. The inkjet ink is preferably an inkjet ink containing metal particles from the viewpoint of excellent cleaning performance with the inkjet head cleaning liquid. That is, the inkjet head cleaning liquid is preferably used for cleaning an inkjet head that ejects an inkjet ink containing metal particles.
（有機溶剤）
　本開示のインクジェットヘッド洗浄液は、有機溶剤を少なくとも含む。上記有機溶剤は、一種のみを使用してもよいし、二種以上を使用してもよい。 (Organic solvent)
The inkjet head cleaning liquid of the present disclosure contains at least an organic solvent. Only one kind of the organic solvent may be used, or two or more kinds thereof may be used.
　上記有機溶剤は、洗浄時の温度環境において、洗浄液として液体であればよく、各有機溶剤が室温で液体である必要はない。上記有機溶剤は、二種以上の混合物である場合は混合物として、室温で液体であることが好ましい。特に、個々の有機溶剤が室温で液体であることが好ましい。また、上記有機溶剤は、単独で融点が２０℃未満であることが好ましく、より好ましくは１０℃未満である。 The above organic solvent only needs to be liquid as a cleaning liquid in the temperature environment during cleaning, and each organic solvent does not need to be liquid at room temperature. When the organic solvent is a mixture of two or more, the mixture is preferably liquid at room temperature. In particular, it is preferred that each organic solvent is liquid at room temperature. Further, the organic solvent alone preferably has a melting point of less than 20°C, more preferably less than 10°C.
　上記有機溶剤は、洗浄性により優れる観点から、インクジェットインクに含まれる粒子に対して相互作用を有する官能基を有しないものであることが好ましい。具体的には、上記有機溶剤は、カルボキシ基、アミノ基、スルホ基、およびチオール基を有しないことが好ましい。 From the viewpoint of better cleaning performance, the organic solvent preferably does not have a functional group that interacts with the particles contained in the inkjet ink. Specifically, the organic solvent preferably does not have a carboxy group, an amino group, a sulfo group, or a thiol group.
　上記有機溶剤としては、インクジェット記録装置の洗浄液に用いられる公知乃至慣用のものが挙げられ、例えば、炭化水素；アルコール；ジメチルホルムアミド（ＤＭＦ）、ジメチルアセトアミド、ラクタム等の鎖状または環状アミド；ジメチルスルホキシド等のスルホキシド；クロロホルム、ジクロロメタン、ジクロロエタン、四塩化炭素、クロロベンゼン、トリフルオロメチルベンゼン等のハロゲン化炭化水素；ジエチルエーテル、ジイソプロピルエーテル、ジメトキシエタン、テトラヒドロフラン（ＴＨＦ）、ジオキサン、グリコールエーテル等の鎖状または環状エーテル；酢酸エチル、酢酸ブチル、ラクトン等の鎖状または環状エステル；メチルエチルケトン（ＭＥＫ）、メチルイソブチルケトン等の鎖状ケトン；アセトニトリル等のニトリルなどが挙げられる。 Examples of the organic solvent include those known or commonly used for cleaning liquids of inkjet recording devices, such as hydrocarbons; alcohols; chain or cyclic amides such as dimethylformamide (DMF), dimethylacetamide and lactam; sulfoxides such as; chloroform, dichloromethane, dichloroethane, carbon tetrachloride, chlorobenzene, trifluoromethylbenzene and other halogenated hydrocarbons; Cyclic ethers; linear or cyclic esters such as ethyl acetate, butyl acetate and lactone; linear ketones such as methyl ethyl ketone (MEK) and methyl isobutyl ketone; and nitriles such as acetonitrile.
　上記有機溶剤は、洗浄対象であるインクジェット記録装置に使用されるインクジェットインクの種類に応じて適宜選択される。上記有機溶剤としては、中でも、金属粒子を含むインクジェットインクの洗浄性に優れる観点から、炭化水素が好ましい。また、洗浄液の表面張力と粘度を高くしてインクジェットヘッドの吐出口からの吐出性をより優れたものとする観点から、アルコールが好ましい。このため、炭化水素およびアルコールの両方を含むことが特に好ましい。 The above organic solvent is appropriately selected according to the type of inkjet ink used in the inkjet recording device to be cleaned. As the organic solvent, among others, a hydrocarbon is preferable from the viewpoint of being excellent in washing properties of an inkjet ink containing metal particles. Also, alcohol is preferable from the viewpoint of increasing the surface tension and viscosity of the cleaning liquid to improve the ejection performance from the ejection port of the inkjet head. For this reason, it is particularly preferred to include both hydrocarbons and alcohols.
　上記炭化水素としては、直鎖または分岐鎖状の脂肪族炭化水素、脂環を有する炭化水素、芳香環を有する炭化水素が挙げられる。また、上記炭化水素は、飽和または不飽和のいずれであってもよい。上記炭化水素としては、中でも、金属粒子を含むインクジェットインクの洗浄性により優れる観点から、直鎖または分岐鎖状の脂肪族炭化水素、脂環を有する炭化水素が好ましく、より好ましくは脂環を有する炭化水素である。 The above hydrocarbons include linear or branched aliphatic hydrocarbons, hydrocarbons having an alicyclic ring, and hydrocarbons having an aromatic ring. Also, the hydrocarbons may be either saturated or unsaturated. Among them, the hydrocarbon is preferably a linear or branched aliphatic hydrocarbon or a hydrocarbon having an alicyclic ring, more preferably having an alicyclic ring, from the viewpoint of better cleaning performance of an inkjet ink containing metal particles. is a hydrocarbon.
　上記直鎖または分岐鎖状の脂肪族炭化水素としては、ヘキサン、ヘプタン、オクタン、ペンタン、ヘキサン、ヘプタン、オクタン、ノナン、デカン、ウンデカン、ドデカン、トリデカン、テトラデカン、ヘキサデカン、これらの不飽和化合物等の飽和または不飽和の直鎖状脂肪族炭化水素などが挙げられる。上記直鎖または分岐鎖状の脂肪族炭化水素における炭素原子数は、洗浄性により優れる観点やインクジェットヘッドの乾燥を抑制する観点から、６以上が好ましく、より好ましくは１０以上、さらに好ましくは１２以上である。 Examples of the linear or branched aliphatic hydrocarbons include hexane, heptane, octane, pentane, hexane, heptane, octane, nonane, decane, undecane, dodecane, tridecane, tetradecane, hexadecane, and unsaturated compounds thereof. Saturated or unsaturated linear aliphatic hydrocarbons and the like are included. The number of carbon atoms in the linear or branched aliphatic hydrocarbon is preferably 6 or more, more preferably 10 or more, and still more preferably 12 or more, from the viewpoint of excellent washability and suppression of drying of the inkjet head. is.
　上記脂環を有する炭化水素における脂環としては、例えば、シクロヘキサン、シクロヘキセン等の単環式炭化水素環；ピネン、ノルボルネン、デカヒドロナフタレン等の二環式炭化水素環；ジシクロペンタン、ジシクロペンテン、ジシクロペンタジエン等の三環以上の炭化水素環などが挙げられる。 The alicyclic ring in the hydrocarbon having the alicyclic ring includes, for example, monocyclic hydrocarbon rings such as cyclohexane and cyclohexene; bicyclic hydrocarbon rings such as pinene, norbornene and decahydronaphthalene; dicyclopentane, dicyclopentene, tricyclic or higher hydrocarbon rings such as dicyclopentadiene;
　上記脂環を有する炭化水素としては、具体的には、例えば、シクロヘキサン、メチルシクロヘキサン等の単環式炭化水素；デカヒドロナフタレン等の水添ナフタレンなどの二環式炭化水素などが挙げられる。上記脂環を有する炭化水素における炭素原子数は、洗浄性により優れる観点やインクジェットヘッドの乾燥を抑制する観点から、６以上が好ましく、より好ましくは１０以上である。 Specific examples of hydrocarbons having an alicyclic ring include monocyclic hydrocarbons such as cyclohexane and methylcyclohexane; and bicyclic hydrocarbons such as hydrogenated naphthalene such as decahydronaphthalene. The number of carbon atoms in the hydrocarbon having an alicyclic ring is preferably 6 or more, and more preferably 10 or more, from the viewpoint of better cleaning performance and suppression of drying of the inkjet head.
　上記芳香環を有する炭化水素としては、例えば、ベンゼン、トルエン、キシレン等の芳香族炭化水素が挙げられる。 Examples of hydrocarbons having aromatic rings include aromatic hydrocarbons such as benzene, toluene, and xylene.
　上記アルコールとしては、例えば、直鎖または分岐鎖状のアルコール、脂環を有するアルコール、芳香環を有するアルコールが挙げられる。また、上記アルコールは、飽和または不飽和のいずれであってもよい。上記アルコールとしては、中でも、金属粒子を含むインクジェットインクの洗浄性に優れる観点から、脂環を有するアルコールや芳香環を有するアルコール等の環状構造を有するアルコールが好ましい。 Examples of the above alcohols include linear or branched alcohols, alcohols having an alicyclic ring, and alcohols having an aromatic ring. Also, the alcohol may be either saturated or unsaturated. Among these alcohols, alcohols having a cyclic structure, such as alcohols having an alicyclic ring and alcohols having an aromatic ring, are preferable from the viewpoint of excellent cleaning properties for inkjet inks containing metal particles.
　上記アルコールの価数は、特に限定されないが、１～２が好ましく、より好ましくは１である。 Although the valence of the alcohol is not particularly limited, it is preferably 1 to 2, more preferably 1.
　上記直鎖または分岐鎖状の一価アルコールとしては、メタノール、エタノール、ｎ－プロパノール、イソプロパノール、ｎ－ブタノール、イソブタノール、ｓｅｃ－ブタノール、ｔｅｒｔ－ブタノール、ｎ－ペンタノール、ｎ－ヘキサノール、ｎ－オクタノール、２－オクタノール、グリコールエーテルなどが挙げられる。上記直鎖または分岐鎖状の二価アルコールとしては、エチレングリコール、ジエチレングリコール、トリエチレングリコール、ポリエチレングリコール等の（ポリ）アルキレングリコールなどが挙げられる。 Examples of the linear or branched monohydric alcohol include methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-pentanol, n-hexanol, n- octanol, 2-octanol, glycol ether and the like. Examples of the linear or branched dihydric alcohol include (poly)alkylene glycols such as ethylene glycol, diethylene glycol, triethylene glycol and polyethylene glycol.
　上記直鎖または分岐鎖状のアルコールにおける炭素原子数は、インクジェットヘッドの乾燥を抑制する観点から、４以上が好ましく、より好ましくは６以上である。 The number of carbon atoms in the linear or branched alcohol is preferably 4 or more, more preferably 6 or more, from the viewpoint of suppressing drying of the inkjet head.
　上記脂環を有するアルコールにおける脂環としては、上述の脂環を有する炭化水素における脂環として例示および説明されたものが挙げられる。上記脂環を有するアルコールとしては、具体的には、例えば、シクロヘキサノール、メチルシクロヘキサノール、シクロヘキサンメタノール、シクロヘキサンエタノール、３－シクロヘキセン－１－メタノール（テトラヒドロベンジルアルコール）等の単環式アルコ－ルなどが挙げられる。上記脂環を有するアルコールにおける炭素原子数は、インクジェットヘッドの乾燥を抑制する観点から、６以上が好ましい。 Examples of the alicyclic ring in the alcohol having the alicyclic ring include those exemplified and explained as the alicyclic ring in the hydrocarbon having the alicyclic ring. Specific examples of alcohols having an alicyclic ring include monocyclic alcohols such as cyclohexanol, methylcyclohexanol, cyclohexanemethanol, cyclohexaneethanol, and 3-cyclohexene-1-methanol (tetrahydrobenzyl alcohol). is mentioned. The number of carbon atoms in the alcohol having an alicyclic ring is preferably 6 or more from the viewpoint of suppressing drying of the inkjet head.
　上記芳香環を有するアルコールとしては、例えば、フェノール、ベンジルアルコール、ｏ－クレゾール、ｍ－クレゾール、ｐ－クレゾールなどが挙げられる。上記芳香環を有する炭化水素における炭素原子数は、インクジェットヘッドの乾燥を抑制する観点から、６以上が好ましい。 Examples of alcohols having aromatic rings include phenol, benzyl alcohol, o-cresol, m-cresol, and p-cresol. The number of carbon atoms in the aromatic ring-containing hydrocarbon is preferably 6 or more from the viewpoint of suppressing drying of the inkjet head.
　上記有機溶剤の含有割合は、上記インクジェットヘッド洗浄液の総量（１００質量％）に対して、５０質量％以上が好ましく、より好ましくは８０質量％、さらに好ましくは９０質量％以上、特に好ましくは９５質量％以上である。上記含有割合が５０質量％以上であると、上記洗浄液の洗浄性および吐出性により優れる。特に、上記有機溶剤中の炭化水素および／またはアルコールの含有割合が上記範囲内であることが好ましい。 The content of the organic solvent is preferably 50% by mass or more, more preferably 80% by mass or more, still more preferably 90% by mass or more, and particularly preferably 95% by mass, relative to the total amount (100% by mass) of the inkjet head cleaning liquid. % or more. When the content is 50% by mass or more, the cleaning properties and dischargeability of the cleaning liquid are excellent. In particular, the content of hydrocarbons and/or alcohols in the organic solvent is preferably within the above range.
　上記有機溶剤が炭化水素およびアルコールを含む場合、炭化水素とアルコールの質量比は、上記洗浄液の洗浄性により優れる観点から、３０：７０～９０：１０が好ましく、より好ましくは４０：６０～８０：２０、さらに好ましくは５５：４５～７０：３０である。 When the organic solvent contains a hydrocarbon and an alcohol, the mass ratio of the hydrocarbon to the alcohol is preferably 30:70 to 90:10, more preferably 40:60 to 80: 20, more preferably 55:45 to 70:30.
（分散剤）
　上記インクジェットヘッド洗浄液は、金属粒子を分散するための分散剤を含むことが好ましい。上記分散剤を含むことにより、金属粒子を含むインクジェットインクを使用した後のインクジェットヘッドを洗浄する際、インクジェットヘッドに残留した上記金属粒子が上記洗浄液中に分散しやすく、洗浄性によりいっそう優れる。上記分散剤は、一種のみを使用してもよいし、二種以上を使用してもよい。 (dispersant)
The inkjet head cleaning liquid preferably contains a dispersant for dispersing the metal particles. By containing the dispersant, when the inkjet head is washed after using the inkjet ink containing the metal particles, the metal particles remaining in the inkjet head are easily dispersed in the cleaning liquid, and the cleaning property is further improved. Only one kind of the dispersant may be used, or two or more kinds thereof may be used.
　上記分散剤は上記有機溶剤への溶解性に優れる観点から、有機化合物であることが好ましい。また、上記分散剤は官能基を有することが好ましい。すなわち、上記分散剤は官能基を有する化合物であることが好ましい。上記官能基としては、例えば、カルボキシ基、アミノ基、スルホ基、チオール基（メルカプト基）が好ましい。官能基を有する分散剤は、微粒子（特にナノサイズの金属粒子）の分散性に優れ、洗浄性によりいっそう優れる。 From the viewpoint of excellent solubility in the organic solvent, the dispersant is preferably an organic compound. Moreover, the dispersant preferably has a functional group. That is, the dispersant is preferably a compound having a functional group. Preferred examples of the functional group include a carboxy group, an amino group, a sulfo group, and a thiol group (mercapto group). A dispersing agent having a functional group is excellent in dispersibility of fine particles (especially nano-sized metal particles) and further excellent in cleaning properties.
　上記カルボキシ基を有する分散剤としては、カルボン酸、アミノ酸などが挙げられる。 Examples of the dispersant having a carboxyl group include carboxylic acids and amino acids.
　上記カルボン酸としては、例えば、ギ酸、酢酸、プロピオン酸、酪酸、吉草酸、カプロン酸、エナント酸、カプリル酸、ペラルゴン酸、カプリン酸、ラウリン酸、ミリスチン酸、パルミチン酸、マルガリン酸、ステアリン酸等の脂肪族飽和モノカルボン酸；オレイン酸、リノール酸、リノレン酸、アラキドン酸、ドコサヘサエン酸、エイコサペンタエン酸等の脂肪族不飽和モノカルボン酸；シュウ酸、マロン酸、コハク酸、グルタル酸、アジピン酸等の脂肪族ジカルボン酸；安息香酸、フタル酸、イソフタル酸、テレフタル酸、トリメリット酸、トリメシン酸、ヘミメリット酸、ピロメリット酸等の芳香族カルボン酸；マレイン酸、フマル酸、シクロペンタンカルボン酸などが挙げられる。ヒドロキシ基を有するカルボン酸としては、乳酸、りんご酸、クエン酸、サリチル酸などが挙げられる。カルボン酸化合物としては炭素原子数２～２０の脂肪族モノカルボン酸が好ましい。 Examples of the carboxylic acid include formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, pelargonic acid, capric acid, lauric acid, myristic acid, palmitic acid, margaric acid, stearic acid, and the like. aliphatic saturated monocarboxylic acids; oleic acid, linoleic acid, linolenic acid, arachidonic acid, docosahesaenoic acid, eicosapentaenoic acid and other aliphatic unsaturated monocarboxylic acids; oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid Aromatic carboxylic acids such as benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, trimesic acid, hemimellitic acid, and pyromellitic acid; maleic acid, fumaric acid, cyclopentanecarboxylic acid etc. Carboxylic acids having a hydroxy group include lactic acid, malic acid, citric acid, salicylic acid and the like. As the carboxylic acid compound, an aliphatic monocarboxylic acid having 2 to 20 carbon atoms is preferred.
　上記アミノ酸としては、例えば、アルギニン、アスパラギン、アスパラギン酸、システイン、グルタミン、グルタミン酸、グリシン、ヒスチジン、イソロイシン、ロイシン、リシン、メチオニン、フェニルアラニン、プロリン、セリン、トレオニン、トリプトファン、チロシン、バリンなどが挙げられる。 Examples of the above amino acids include arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, and valine.
　上記アミノ基を有する分散剤としてはアミン、上記アミノ酸、アミノアルコールなどが挙げられる。 Examples of the dispersant having an amino group include amines, the above amino acids, and aminoalcohols.
　上記アミンとしては、アミノ基の窒素原子上に脂肪族炭化水素基を有するアミン（脂肪族炭化水素アミン）、脂環式炭化水素基を有するアミン（脂環式炭化水素アミン）、芳香族炭化水素基を有するアミン（芳香族炭化水素アミン）、複素環を有するアミン（複素環式アミン）などが挙げられる。なお、アミンにおける炭化水素基および複素環は、置換基を有していてもよい。 Examples of the amine include amines having an aliphatic hydrocarbon group on the nitrogen atom of an amino group (aliphatic hydrocarbon amines), amines having an alicyclic hydrocarbon group (alicyclic hydrocarbon amines), and aromatic hydrocarbons. amines having a group (aromatic hydrocarbon amines), amines having a heterocyclic ring (heterocyclic amines), and the like. In addition, the hydrocarbon group and heterocyclic ring in the amine may have a substituent.
　上記脂肪族炭化水素アミンとしては、アミノ基と当該アミノ基の窒素原子上に直鎖状脂肪族炭化水素基を有するアミン（直鎖状脂肪族炭化水素アミン）、アミノ基と当該アミノ基の窒素原子上に分岐鎖状脂肪族炭化水素基を有するアミン（分岐鎖状脂肪族炭化水素アミン）が挙げられる。 Examples of the aliphatic hydrocarbon amine include an amino group and an amine having a linear aliphatic hydrocarbon group on the nitrogen atom of the amino group (linear aliphatic hydrocarbon amine), an amino group and the nitrogen of the amino group Amines having branched chain aliphatic hydrocarbon groups on atoms (branched chain aliphatic hydrocarbon amines) can be mentioned.
　上記直鎖状脂肪族炭化水素アミンとしては、例えば、エチルアミン、ｎ－プロピルアミン、ｎ－ブチルアミン、ｎ－ペンチルアミン、ｎ－ヘキシルアミン、ｎ－ヘプチルアミン、ｎ－オクチルアミン、ｎ－ノニルアミン、ｎ－デシルアミン、ｎ－ウンデシルアミン、ｎ－ドデシルアミン、ｎ－トリデシルアミン、ｎ－テトラデシルアミン、ｎ－ペンタデシルアミン、ｎ－ヘキサデシルアミン、ｎ－ヘプタデシルアミン、ｎ－オクタデシルアミン等の飽和直鎖状脂肪族炭化水素アミン、オレイルアミン等の不飽和直鎖状脂肪族炭化水素アミン等の第一級モノアミン；Ｎ，Ｎ－ジエチルアミン、Ｎ，Ｎ－ジ（ｎ－プロピル）アミン、Ｎ，Ｎ－ジ（ｎ－ブチル）アミン、Ｎ，Ｎ－ジ（ｎ－ペンチル）アミン、Ｎ，Ｎ－ジ（ｎ－ヘキシル）アミン、Ｎ，Ｎ－ジ（ｎ－ペプチル）アミン、Ｎ，Ｎ－ジ（ｎ－オクチル）アミン、Ｎ，Ｎ－ジ（ｎ－ノニル）アミン、Ｎ，Ｎ－ジ（ｎ－デシル）アミン、Ｎ，Ｎ－ジ（ｎ－ウンデシル）アミン、Ｎ，Ｎ－ジ（ｎ－ドデシル）アミン、Ｎ－メチル－Ｎ－（ｎ－プロピル）アミン、Ｎ－エチル－Ｎ－（ｎ－プロピル）アミン、Ｎ－（ｎ－プロピル）－Ｎ－（ｎ－ブチル）アミン等の第二級モノアミン；トリエチルアミン、トリ（ｎ－ブチル）アミン、トリ（ｎ－ヘキシル）アミン等の第三級モノアミン等のような、１つのアミノ基と当該アミノ基の窒素原子上に１以上の直鎖状脂肪族炭化水素基を有するモノアミン（直鎖状脂肪族炭化水素モノアミン）が挙げられる。 Examples of the linear aliphatic hydrocarbon amines include ethylamine, n-propylamine, n-butylamine, n-pentylamine, n-hexylamine, n-heptylamine, n-octylamine, n-nonylamine, n -decylamine, n-undecylamine, n-dodecylamine, n-tridecylamine, n-tetradecylamine, n-pentadecylamine, n-hexadecylamine, n-heptadecylamine, n-octadecylamine, etc. primary monoamines such as saturated linear aliphatic hydrocarbon amines, unsaturated linear aliphatic hydrocarbon amines such as oleylamine; N,N-diethylamine, N,N-di(n-propyl)amine, N, N-di(n-butyl)amine, N,N-di(n-pentyl)amine, N,N-di(n-hexyl)amine, N,N-di(n-peptyl)amine, N,N- di(n-octyl)amine, N,N-di(n-nonyl)amine, N,N-di(n-decyl)amine, N,N-di(n-undecyl)amine, N,N-di( n-dodecyl)amine, N-methyl-N-(n-propyl)amine, N-ethyl-N-(n-propyl)amine, N-(n-propyl)-N-(n-butyl)amine, etc. One amino group and one or more direct atoms on the nitrogen atom of the amino group, such as secondary monoamines; tertiary monoamines such as triethylamine, tri(n-butyl)amine, tri(n-hexyl)amine, etc. A monoamine having a chain aliphatic hydrocarbon group (straight-chain aliphatic hydrocarbon monoamine) can be mentioned.
　上記分岐鎖状脂肪族炭化水素アミンとしては、例えば、イソブチルアミン、ｓｅｃ－ブチルアミン、ｔｅｒｔ－ブチルアミン、イソペンチルアミン、ｔｅｒｔ－ペンチルアミン、イソヘキシルアミン、２－エチルヘキシルアミン、ｔｅｒｔ－オクチルアミン等の第一級アミン；Ｎ，Ｎ－ジイソブチルアミン、Ｎ，Ｎ－ジイソペンチルアミン、Ｎ，Ｎ－ジイソヘキシルアミン、Ｎ，Ｎ－ジ（２－エチルヘキシル）アミン等の第二級アミン；Ｎ，Ｎ，Ｎ－トリイソブチルアミン、Ｎ，Ｎ，Ｎ－トリイソペンチルアミン、Ｎ，Ｎ，Ｎ－トリイソヘキシルアミン、Ｎ，Ｎ，Ｎ－トリ（２－エチルヘキシル）アミン等の第三級アミン等のような、１つのアミノ基と当該アミノ基の窒素原子上に１以上の分岐鎖状脂肪族炭化水素基を有するモノアミン（分岐鎖状脂肪族炭化水素モノアミン）が挙げられる。 Examples of the branched-chain aliphatic hydrocarbon amine include isobutylamine, sec-butylamine, tert-butylamine, isopentylamine, tert-pentylamine, isohexylamine, 2-ethylhexylamine, tert-octylamine and the like. primary amine; secondary amine such as N,N-diisobutylamine, N,N-diisopentylamine, N,N-diisohexylamine, N,N-di(2-ethylhexyl)amine; N,N , N-triisobutylamine, N,N,N-triisopentylamine, N,N,N-triisohexylamine, N,N,N-tri(2-ethylhexyl)amine and other tertiary amines and monoamines (branched-chain aliphatic hydrocarbon monoamines) having one amino group and one or more branched-chain aliphatic hydrocarbon groups on the nitrogen atom of the amino group.
　また、上記アミンとしては、ジアミン等のアミノ基を２以上有するアミンが挙げられる。上記ジアミンとしては、例えば、エチレンジアミン、Ｎ，Ｎ－ジメチルエチレンジアミン、Ｎ，Ｎ’－ジメチルエチレンジアミン、Ｎ，Ｎ－ジエチルエチレンジアミン、Ｎ，Ｎ’－ジエチルエチレンジアミン、１，３－プロパンジアミン、２，２－ジメチル－１，３－プロパンジアミン、Ｎ，Ｎ－ジメチル－１，３－プロパンジアミン、Ｎ，Ｎ’－ジメチル－１，３－プロパンジアミン、Ｎ，Ｎ－ジエチル－１，３－プロパンジアミン、Ｎ，Ｎ’－ジエチル－１，３－プロパンジアミン、１，４－ブタンジアミン、Ｎ，Ｎ－ジメチル－１，４－ブタンジアミン、Ｎ，Ｎ’－ジメチル－１，４－ブタンジアミン、Ｎ，Ｎ－ジエチル－１，４－ブタンジアミン、Ｎ，Ｎ’－ジエチル－１，４－ブタンジアミン、１，５－ペンタンジアミン、１，５－ジアミノ－２－メチルペンタン、１，６－ヘキサンジアミン、Ｎ，Ｎ－ジメチル－１，６－ヘキサンジアミン、Ｎ，Ｎ’－ジメチル－１，６－ヘキサンジアミン、１，７－ヘプタンジアミン、１，８－オクタンジアミン等、２価の脂肪族炭化水素基と当該脂肪族炭化水素基を介した２つのアミノ基とを有する化合物（脂肪族炭化水素ジアミン）が挙げられる。 In addition, examples of the amine include amines having two or more amino groups such as diamine. Examples of the diamine include ethylenediamine, N,N-dimethylethylenediamine, N,N'-dimethylethylenediamine, N,N-diethylethylenediamine, N,N'-diethylethylenediamine, 1,3-propanediamine, 2,2- Dimethyl-1,3-propanediamine, N,N-dimethyl-1,3-propanediamine, N,N'-dimethyl-1,3-propanediamine, N,N-diethyl-1,3-propanediamine, N , N′-diethyl-1,3-propanediamine, 1,4-butanediamine, N,N-dimethyl-1,4-butanediamine, N,N′-dimethyl-1,4-butanediamine, N,N -diethyl-1,4-butanediamine, N,N'-diethyl-1,4-butanediamine, 1,5-pentanediamine, 1,5-diamino-2-methylpentane, 1,6-hexanediamine, N , N-dimethyl-1,6-hexanediamine, N,N'-dimethyl-1,6-hexanediamine, 1,7-heptanediamine, 1,8-octanediamine, and a divalent aliphatic hydrocarbon group A compound having two amino groups via the aliphatic hydrocarbon group (aliphatic hydrocarbon diamine) can be mentioned.
　上記芳香族炭化水素アミンとしては、例えば、ベンジルアミンなどが挙げられる。上記複素環式アミンとしては、例えば、ピペリジン、モルホリンなどが挙げられる。 Examples of the aromatic hydrocarbon amine include benzylamine. Examples of the heterocyclic amines include piperidine and morpholine.
　上記アミノアルコールとしては、例えば、ジエタノールアミン、モノエタノールアミン、アミノエチルエタノールアミン、ｎ－メチルエタノールアミン、３－アミノ－１－プロパノールなどが挙げられる。 Examples of the amino alcohols include diethanolamine, monoethanolamine, aminoethylethanolamine, n-methylethanolamine, 3-amino-1-propanol, and the like.
　上記スルホ基を有する分散剤としては、例えば、ベンゼンスルホン酸、ｐ－トルエンスルホン酸、キシレンスルホン酸、ナフタレンスルホン酸、デシルベンゼンスルホン酸、ドデシルベンゼンスルホン酸、ペンタデシルベンゼンスルホン酸、メタンスルホン酸、エタンスルホン酸、１－プロパンスルホン酸、１－ブタンスルホン酸、１－ヘキサンスルホン酸、１－ヘプタンスルホン酸、１－オクタンスルホン酸、１－ノナンスルホン酸、１－デカンスルホン酸、１－ドデカンスルホン酸、ビニルスルホン酸、スチレンスルホン酸、アリルスルホン酸、エタンジスルホン酸、ブタンジスルホン酸、ペンタンジスルホン酸、デカンジスルホン酸、ベンゼンジスルホン酸、ナフタレンジスルホン酸、トルエンジスルホン酸、ジメチルベンゼンジスルホン酸、ジエチルベンゼンジスルホン酸、メチルナフタレンジスルホン酸、エチルナフタレンジスルホン酸などが挙げられる。 Dispersants having a sulfo group include, for example, benzenesulfonic acid, p-toluenesulfonic acid, xylenesulfonic acid, naphthalenesulfonic acid, decylbenzenesulfonic acid, dodecylbenzenesulfonic acid, pentadecylbenzenesulfonic acid, methanesulfonic acid, ethanesulfonic acid, 1-propanesulfonic acid, 1-butanesulfonic acid, 1-hexanesulfonic acid, 1-heptanesulfonic acid, 1-octanesulfonic acid, 1-nonanesulfonic acid, 1-decanesulfonic acid, 1-dodecanesulfonic acid acid, vinylsulfonic acid, styrenesulfonic acid, allylsulfonic acid, ethanedisulfonic acid, butanedisulfonic acid, pentanedisulfonic acid, decanedisulfonic acid, benzenedisulfonic acid, naphthalenedisulfonic acid, toluenedisulfonic acid, dimethylbenzenedisulfonic acid, diethylbenzenedisulfonic acid , methylnaphthalenedisulfonic acid, ethylnaphthalenedisulfonic acid, and the like.
　上記メルカプト基を有する分散剤としては、例えば、メタンチオール、メタンジチオール、エタンチオール、１，１－エタンジチオール、１，２－エタンジチオール、２－ヒドロキシエタンチオール、プロパンチオール、２－プロパンチオール、２－プロペンチオール、１，１－プロパンジチオール、１，２－プロパンジチオール、１，３－プロパンジチオール、ブタンチオール、２－ブタンチオール、１，４－ブタンジチオール、２，３－ブタンジチオール、２－メチルプロパンチオール、２－メチル－２－プロパンチオール、３－ヒドロキシ－２－ブタンチオール、ペンタンチオール、２－ペンタンチオール、３－ペンタンチオール、シクロペンタンチオール、２－メチルブタンチオール、３－メチルブタンチオール、３－メチル－２－ブタンチオール、３－メチル－２－ブテンチオール、３－ヒドロキシ－２－メチルブタンチオール、ヘキサンチオール、１，６－ヘキサンジチオール、シクロヘキサンチオール、３，３－ジメチルブタンチオール、ヘプタンチオール、２－ヘプタンチオール、４－エトキシ－２－メチル－２－ブタンチオール、オクタンチオール、１，８－オクタンジチオール、（Ｓ）－１－メトキシ－３－ヘプタンチオール、１，９－ノナンジチオール、１，１－ジメチルヘプタンチオール、ドデカンチオール、ヘキサデカンチオールなどが挙げられる。 Dispersants having a mercapto group include, for example, methanethiol, methanedithiol, ethanethiol, 1,1-ethanedithiol, 1,2-ethanedithiol, 2-hydroxyethanethiol, propanethiol, 2-propanethiol, 2 -propenethiol, 1,1-propanedithiol, 1,2-propanedithiol, 1,3-propanedithiol, butanethiol, 2-butanethiol, 1,4-butanedithiol, 2,3-butanedithiol, 2-methyl propanethiol, 2-methyl-2-propanethiol, 3-hydroxy-2-butanethiol, pentanethiol, 2-pentanethiol, 3-pentanethiol, cyclopentanethiol, 2-methylbutanethiol, 3-methylbutanethiol, 3-methyl-2-butanethiol, 3-methyl-2-butanethiol, 3-hydroxy-2-methylbutanethiol, hexanethiol, 1,6-hexanedithiol, cyclohexanethiol, 3,3-dimethylbutanethiol, heptane thiol, 2-heptanethiol, 4-ethoxy-2-methyl-2-butanethiol, octanethiol, 1,8-octanedithiol, (S)-1-methoxy-3-heptanethiol, 1,9-nonanedithiol, 1,1-dimethylheptanethiol, dodecanethiol, hexadecanethiol and the like.
　上記分散剤の炭素原子数は、特に限定されないが、４～２４が好ましく、より好ましくは６～２２、さらに好ましくは１０～２０である。上記炭素原子数が上記範囲内であると、金属粒子の分散性がより良好であり、洗浄性により優れる。 The number of carbon atoms in the dispersant is not particularly limited, but is preferably 4-24, more preferably 6-22, still more preferably 10-20. When the number of carbon atoms is within the above range, the dispersibility of the metal particles is better, and the washability is more excellent.
　上記官能基は、インクジェットインクに含まれ得る金属粒子の種類に応じて適宜選択することが好ましい。上記金属粒子が後述のように有機保護剤により表面保護されている場合、当該金属粒子の分散性に優れ、洗浄性により優れる観点から、上記官能基は、上記有機保護剤が備える官能基と同じであることが好ましい。また、洗浄性によりいっそう優れる観点から、上記分散剤の炭素原子数は、上記金属粒子の表面を保護する有機保護剤の炭素原子数よりも多いことが好ましい。 The functional group is preferably selected as appropriate according to the type of metal particles that can be contained in the inkjet ink. When the metal particles are surface-protected with an organic protective agent as described later, the functional group is the same as the functional group of the organic protective agent, from the viewpoint of excellent dispersibility of the metal particles and excellent cleaning properties. is preferably In addition, from the viewpoint of even better washability, the number of carbon atoms in the dispersant is preferably greater than the number of carbon atoms in the organic protective agent that protects the surfaces of the metal particles.
　上記分散剤としては、中でも、アミンが好ましく、これらの内でも、炭素原子数８以上の飽和または不飽和の脂肪族炭化水素モノアミン化合物が好ましく、より好ましくは炭素原子数８以上の直鎖状脂肪族炭化水素モノアミンである。炭素原子数８以上であることにより、分散剤のアミノ基が金属粒子表面に吸着しやすく、その際に金属粒子同士の間隔を確保しやすいため、金属粒子同士の凝集を防ぐ作用が向上し、分散性および洗浄性により優れる。炭素原子数の上限は特に定められないが、入手のし易さ等を考慮して、通常、炭素原子数１８までの飽和または不飽和の脂肪族炭化水素モノアミン化合物が好ましい。特に、オクチルアミン、ノニルアミン、デシルアミン、ウンデシルアミン、ドデシルアミン、オレイルアミン等の炭素原子数８～１８の直鎖状脂肪族炭化水素モノアミンが好ましく用いられる。 Among them, amines are preferred as the dispersant, and among these, saturated or unsaturated aliphatic hydrocarbon monoamine compounds having 8 or more carbon atoms are preferred, more preferably straight-chain fatty acids having 8 or more carbon atoms. group hydrocarbon monoamines. When the number of carbon atoms is 8 or more, the amino group of the dispersing agent is easily adsorbed on the surface of the metal particles, and at that time, it is easy to secure the space between the metal particles, so the effect of preventing the aggregation of the metal particles is improved. Better dispersibility and washability. Although the upper limit of the number of carbon atoms is not particularly defined, a saturated or unsaturated aliphatic hydrocarbon monoamine compound having up to 18 carbon atoms is generally preferable in consideration of availability. In particular, linear aliphatic hydrocarbon monoamines having 8 to 18 carbon atoms such as octylamine, nonylamine, decylamine, undecylamine, dodecylamine and oleylamine are preferably used.
　上記分散剤の含有割合は、上記インクジェットヘッド洗浄液の総量（１００質量％）に対して、０．１～１０質量％が好ましく、より好ましくは０．３～８質量％、さらに好ましくは０．５～６質量％である。上記含有割合が０．１質量％以上であると、金属粒子の分散性により優れる。上記含有割合が１０質量％以下であると、インクジェットヘッドの洗浄性および吐出性により優れる。 The content of the dispersant is preferably 0.1 to 10% by mass, more preferably 0.3 to 8% by mass, and still more preferably 0.5%, relative to the total amount (100% by mass) of the inkjet head cleaning liquid. ~6% by mass. When the content is 0.1% by mass or more, the metal particles are more excellent in dispersibility. When the content is 10% by mass or less, the ink-jet head is more excellent in washability and dischargeability.
（高融点成分）
　上記インクジェットヘッド洗浄液は、融点が２０℃以上である成分を含むことが好ましい。なお、本明細書において、上記融点が２０℃以上である成分を「高融点成分」と称する場合がある。上記高融点成分は洗浄液を吐出口から吐出して基板に塗布した際に揮発しにくいため、上記高融点成分を上記インクジェットヘッド洗浄液に配合することで、洗浄液の吐出性を確認することが容易となる。上記高融点成分は、一種のみを使用してもよいし、二種以上を使用してもよい。 (High melting point component)
The inkjet head cleaning liquid preferably contains a component having a melting point of 20° C. or higher. In this specification, a component having a melting point of 20°C or higher may be referred to as a "high melting point component". Since the high-melting-point component does not easily volatilize when the cleaning liquid is ejected from the ejection port and applied to the substrate, it is easy to check the ejection properties of the cleaning liquid by blending the high-melting-point component into the inkjet head cleaning liquid. Become. Only one kind of the high-melting-point component may be used, or two or more kinds thereof may be used.
　上記高融点成分の融点は、上記有機溶剤への溶解性に優れる観点から、１００℃以下が好ましく、より好ましくは６０℃以下、さらに好ましくは４０℃以下である。 From the viewpoint of excellent solubility in the organic solvent, the melting point of the high-melting-point component is preferably 100°C or lower, more preferably 60°C or lower, and even more preferably 40°C or lower.
　上記高融点成分は、上記有機溶剤や上記分散剤に該当する成分であってもよいし、これら以外の成分であってもよい。中でも、洗浄性および吐出性を高く維持しつつ高融点成分を配合する観点で、上記分散剤が上記高融点成分であることが好ましい。 The high melting point component may be a component corresponding to the organic solvent or the dispersant, or may be a component other than these. Above all, the dispersant is preferably the high melting point component from the viewpoint of blending the high melting point component while maintaining high detergency and dischargeability.
　上記高融点成分の含有割合は、上記インクジェットヘッド洗浄液の総量（１００質量％）に対して、０．１～１０質量％が好ましく、より好ましくは０．３～８質量％、さらに好ましくは０．５～６質量％である。上記含有割合が０．１質量％以上であると、洗浄液の吐出性をより確認しやすい。上記含有割合が１０質量％以下であると、相対的に融点が低い溶剤の割合が多くなり、インクジェットヘッドの洗浄性により優れる。 The content of the high melting point component is preferably 0.1 to 10% by mass, more preferably 0.3 to 8% by mass, and still more preferably 0.1% by mass to the total amount (100% by mass) of the inkjet head cleaning liquid. It is 5 to 6% by mass. When the content is 0.1% by mass or more, it is easier to check the dischargeability of the cleaning liquid. When the content is 10% by mass or less, the proportion of the solvent having a relatively low melting point is increased, resulting in superior cleaning performance of the inkjet head.
　上記インクジェットヘッド洗浄液は、上述の各成分以外のその他の成分を含んでいてもよい。上記その他の成分としては、例えば、水、界面活性剤、ｐＨ調整剤、防錆剤、防腐剤、防黴剤、酸化防止剤、還元防止剤、蒸発促進剤、キレート化剤、酸などが挙げられる。上記その他の成分は、一種のみを使用してもよいし、二種以上を使用してもよい。上記インクジェットヘッド洗浄液中の上記その他の成分の含有割合は、例えば１０質量％以下であり、好ましくは５質量％以下、より好ましくは１質量％以下である。 The inkjet head cleaning liquid may contain components other than the components described above. Examples of the other components include water, surfactants, pH adjusters, rust inhibitors, antiseptics, anti-mold agents, antioxidants, anti-reduction agents, evaporation accelerators, chelating agents, acids, and the like. be done. Only one kind of the other components may be used, or two or more kinds thereof may be used. The content of the other components in the inkjet head cleaning liquid is, for example, 10% by mass or less, preferably 5% by mass or less, and more preferably 1% by mass or less.
　上記インクジェットヘッド洗浄液は、２３℃における粘度が２．５ｍＰａ・ｓ以上であることが好ましく、より好ましくは２．８ｍＰａ・ｓ以上、さらに好ましくは３．０ｍＰａ・ｓ以上である。上記粘度が２．５ｍＰａ・ｓ以上であると、吐出口からの吐出時に洗浄液が液滴として吐出されやすく、インクジェットヘッドの洗浄性および吐出口の閉塞状況をより容易に確認することができる。 The inkjet head cleaning liquid preferably has a viscosity at 23°C of 2.5 mPa·s or more, more preferably 2.8 mPa·s or more, and still more preferably 3.0 mPa·s or more. When the viscosity is 2.5 mPa·s or more, the cleaning liquid is easily ejected as droplets when ejected from the ejection port, and it is possible to more easily check the cleaning performance of the inkjet head and clogging of the ejection port.
　上記インクジェットヘッド洗浄液は、表面張力が２５．８°以上であることが好ましく、より好ましくは２６．０°以上である。上記粘表面張力が２５．８°以上であると、吐出口からの吐出時に洗浄液が液滴として吐出されやすく、インクジェットヘッドの洗浄性および吐出口の閉塞状況をより容易に確認することができる。上記表面張力は、Ｗｉｌｈｅｌｍｙ法により測定される値である。 The inkjet head cleaning liquid preferably has a surface tension of 25.8° or more, more preferably 26.0° or more. When the viscous surface tension is 25.8° or more, the cleaning liquid is easily ejected as droplets when ejected from the ejection port, and the cleaning performance of the inkjet head and clogging of the ejection port can be more easily confirmed. The surface tension is a value measured by the Wilhelmy method.
　上記インクジェットヘッド洗浄液は、洗浄対象であるインクジェットヘッドの吐出口から液滴として吐出して基材へ印刷することができるものである。このように、上記インクジェットヘッド洗浄液は吐出口から垂れ流れずに吐出して基材に印刷することができるため、個々の吐出口の閉塞状況を確認することにより、吐出口の閉塞状況を確認することができる。このため、インクジェットヘッドの洗浄後、実際にインクジェットインクの吐出を試みなくてもインクジェットヘッドの洗浄が充分であるかを確認することができる。 The inkjet head cleaning liquid can be ejected as droplets from the ejection port of the inkjet head to be cleaned and printed on the substrate. In this way, the inkjet head cleaning liquid can be discharged from the discharge ports without dripping and can be printed on the base material. be able to. Therefore, after cleaning the inkjet head, it is possible to check whether the cleaning of the inkjet head is sufficient without actually trying to eject the inkjet ink.
　上記基材は、上記インクジェットヘッドの吐出口から吐出された上記インクジェットヘッド洗浄液の液滴を受けることができるものであれば特に限定されず、木、紙、金属、ガラス、プラスチックなどの公知乃至慣用の物質が挙げられる。 The substrate is not particularly limited as long as it can receive droplets of the inkjet head cleaning liquid ejected from the ejection port of the inkjet head. substances.
（インクジェットインク）
　上述のように、本開示のインクジェットヘッド洗浄液は、金属粒子を含有するインクジェットインクを吐出するインクジェットヘッドの洗浄に用いるためのものであることが好ましい。 (inkjet ink)
As described above, the inkjet head cleaning liquid of the present disclosure is preferably used for cleaning an inkjet head that ejects inkjet ink containing metal particles.
　上記金属粒子としては、金属塗料に用いられる公知乃至慣用のものを使用することができるが、中でも、金属微粒子（マイクロ粒子、ナノ粒子など）が好ましい。また、金属粒子の表面が有機保護剤で被覆された構成を有する表面修飾金属粒子が好ましい。すなわち、上記金属粒子は表面修飾金属微粒子が好ましい。上記金属粒子は、一種のみを使用してもよいし、二種以上を使用してもよい。 As the metal particles, known or commonly used ones used in metal paints can be used, but metal fine particles (microparticles, nanoparticles, etc.) are preferred. Moreover, surface-modified metal particles having a structure in which the surfaces of the metal particles are coated with an organic protective agent are preferable. That is, the metal particles are preferably surface-modified fine metal particles. Only one kind of the metal particles may be used, or two or more kinds thereof may be used.
　上記微粒子の一次粒子の大きさ（平均一次粒子径）は、１０００μｍ未満であることが好ましく、より好ましくは１０００ｎｍ未満、さらに好ましくは１００ｎｍ以下、さらに好ましくは８０ｎｍ以下、さらに好ましくは７０ｎｍ以下、特に好ましくは６０ｎｍ以下である。上記平均一次粒子径は、例えば０．５ｎｍ以上、または１ｎｍ以上であってもよい。 The primary particle size (average primary particle diameter) of the fine particles is preferably less than 1000 μm, more preferably less than 1000 nm, still more preferably 100 nm or less, even more preferably 80 nm or less, even more preferably 70 nm or less, and particularly preferably is 60 nm or less. The average primary particle size may be, for example, 0.5 nm or more, or 1 nm or more.
　上記金属粒子を構成する金属としては、導電性を有する金属が挙げられ、例えば、金、銀、銅、ニッケル、アルミニウム、ロジウム、コバルト、ルテニウム、プラチナ、パラジウム、クロム、インジウムなどが挙げられる。 Examples of metals that make up the metal particles include conductive metals such as gold, silver, copper, nickel, aluminum, rhodium, cobalt, ruthenium, platinum, palladium, chromium, and indium.
　上記有機保護剤としては、特に限定されず、金属粒子の保護剤（安定剤）として用いられる公知乃至慣用の有機保護剤が挙げられる。上記有機保護剤としては、官能基を有する有機化合物が挙げられる。上記官能基としては、上述の分散剤が有し得る官能基として例示および説明されたものが挙げられる。上記官能基としては、中でも、カルボキシ基、アミノ基、スルホ基、チオール基（メルカプト基）が好ましく、より好ましくはアミノ基である。上記有機保護剤は、一種のみを使用してもよいし、二種以上を使用してもよい。 The organic protective agent is not particularly limited, and includes known or commonly used organic protective agents used as protective agents (stabilizers) for metal particles. Examples of the organic protective agent include organic compounds having functional groups. Examples of the functional group include those exemplified and explained as the functional group that the dispersant may have. Among these functional groups, a carboxy group, an amino group, a sulfo group, and a thiol group (mercapto group) are preferable, and an amino group is more preferable. Only one type of the organic protective agent may be used, or two or more types may be used.
　上記官能基を有する上記有機保護剤の具体例としては、上述の分散剤として例示および説明されたものが挙げられる。 Specific examples of the organic protective agent having the functional group include those exemplified and explained as the dispersant above.
　上記有機保護剤の炭素原子数は、特に限定されないが、４～２４が好ましく、より好ましくは６～２２、さらに好ましくは１０～２０である。上記炭素原子数が４以上であると、有機保護剤の一分子の長さが長くなる傾向があり、金属粒子間の距離を一定以上に維持することができ、インクジェットインク中の金属粒子の分散性が良好となる傾向がある。上記炭素原子数が２４以下であると、有機保護剤の沸点が低くなる傾向があり、金属粒子の焼成時に有機保護剤が低温で揮発しやすくなり、金属粒子の低温焼成が容易となる傾向がある。 Although the number of carbon atoms in the organic protective agent is not particularly limited, it is preferably 4-24, more preferably 6-22, still more preferably 10-20. When the number of carbon atoms is 4 or more, the length of one molecule of the organic protective agent tends to be long, the distance between the metal particles can be maintained at a certain level or more, and the metal particles are dispersed in the inkjet ink. tend to be better. When the number of carbon atoms is 24 or less, the boiling point of the organic protective agent tends to be low, and the organic protective agent tends to volatilize at low temperatures during firing of the metal particles, which tends to facilitate low-temperature firing of the metal particles. be.
　本明細書に開示された各々の態様は、本明細書に開示された他のいかなる特徴とも組み合わせることができる。各実施形態における各構成およびそれらの組み合わせ等は、一例であって、本開示の趣旨から逸脱しない範囲内で、適宜、構成の付加、省略、置換、およびその他の変更が可能である。また、本開示に係る各発明は、実施形態や以下の実施例によって限定されることはなく、特許請求の範囲によってのみ限定される。 Each aspect disclosed in this specification can be combined with any other feature disclosed in this specification. Each configuration, combination thereof, etc. in each embodiment is an example, and addition, omission, replacement, and other changes of configuration are possible as appropriate without departing from the scope of the present disclosure. In addition, each invention according to the present disclosure is not limited by the embodiments or the following examples, but only by the claims.
　以下に、実施例に基づいて本開示の一実施形態をより詳細に説明する。 An embodiment of the present disclosure will be described in more detail below based on examples.
　実施例１～３および比較例１～３
　表１に示す配合量で各成分を混合し、インクジェットヘッド洗浄液を調製した。表における各成分の配合量は質量部を示す。 Examples 1-3 and Comparative Examples 1-3
Each component was mixed in the compounding amounts shown in Table 1 to prepare an inkjet head cleaning liquid. The compounding amount of each component in the table indicates parts by mass.
　＜評価＞
　実施例および比較例で作製した洗浄液について、以下の評価を行った。結果を表に示す。 <Evaluation>
The cleaning liquids prepared in Examples and Comparative Examples were evaluated as follows. The results are shown in the table.
（１）洗浄性
　インクジェットヘッド（コニカミノルタ株式会社製）を搭載したインクジェット装置（株式会社アルバック製）を使用し、インクジェットインク（商品名「Ｐｉｃｏｓｉｌ　ＤＮＳ１６３Ｓ」、株式会社ダイセル製）を用いた印刷を行う際に閉塞した場合の解消方法として、不織布を洗浄液で湿らせてインクジェットヘッドに押し当てた。そして、洗浄性について以下の基準で評価を行った。なお、閉塞の解消の有無は、インクジェットインクを印刷して確認を行った。
○（良好）：閉塞を比較的容易に（１～２回の押し当てで）解消することができる。
×（不良）：閉塞の解消に時間を要する（１～２回の押し当てでは解消しきらない）。 (1) Washability Using an inkjet device (manufactured by ULVAC, Inc.) equipped with an inkjet head (manufactured by Konica Minolta, Inc.), printing is performed using inkjet ink (trade name “Picosil DNS163S”, manufactured by Daicel Corporation). As a method for solving the clogging, a nonwoven fabric was moistened with a cleaning liquid and pressed against the inkjet head. Then, the washability was evaluated according to the following criteria. In addition, the presence or absence of elimination of clogging was confirmed by printing with inkjet ink.
◯ (Good): Obstruction can be eliminated relatively easily (by pressing once or twice).
x (defective): It takes a long time to eliminate the blockage (it cannot be completely eliminated by pressing once or twice).
（２）吐出性
　実施例および比較例で作製した洗浄液を、インクジェットヘッド（コニカミノルタ株式会社製）を搭載したインクジェット装置（株式会社アルバック製）を用いて吐出検討を行った。吐出性について、液滴観察カメラを用いて吐出口からの液滴形状を観察し、以下の基準で評価を行った。
　○（良好）：吐出口から洗浄液が液滴として吐出されていることが確認できた。
　×（不良）：しぶき状に吐出され、液滴として吐出されなかった。 (2) Ejectability Discharge of the cleaning liquids prepared in Examples and Comparative Examples was examined using an inkjet device (manufactured by ULVAC, Inc.) equipped with an inkjet head (manufactured by Konica Minolta, Inc.). The droplet shape from the ejection port was observed using a droplet observation camera, and the ejection property was evaluated according to the following criteria.
◯ (Good): It was confirmed that the cleaning liquid was discharged as droplets from the discharge port.
x (defective): It was ejected in the form of splashes, and was not ejected as droplets.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１から分かるように、実施例の洗浄液はいずれも洗浄性および吐出性の両方に優れており、上記洗浄液は吐出口から液滴として吐出された。このため、上記洗浄液は、インクジェットヘッドから吐出して基材へ印刷することが可能であり、インクジェットヘッドの洗浄後、実際にインクジェットインクを吐出しなくても吐出口の閉塞状況を確認することができる。一方、比較例１の洗浄液は、実際にインクジェットインクを吐出することで初めて洗浄性に問題がないことが確認できたものの、吐出性が劣り、洗浄液はしぶき状に吐出され、液滴として吐出されなかった。このため、比較例１の洗浄液はインクジェットヘッドから吐出して基材へ印刷することができず、比較例１の洗浄液を用いてインクジェットヘッドを洗浄した場合、その後実際にインクジェットインクを吐出しなければ吐出口の閉塞状況を確認することができない。なお、比較例２および３の洗浄液は、洗浄性に劣っていた。 As can be seen from Table 1, all the cleaning liquids of Examples were excellent in both cleaning properties and ejection properties, and the cleaning liquids were ejected as droplets from the ejection port. Therefore, the cleaning liquid can be ejected from the inkjet head and printed on the substrate, and after cleaning the inkjet head, it is possible to check whether or not the ejection port is clogged without actually ejecting the inkjet ink. can. On the other hand, in the cleaning liquid of Comparative Example 1, although it was confirmed for the first time that there was no problem in the cleaning property by actually ejecting the inkjet ink, the ejection property was inferior, and the cleaning liquid was ejected in the form of splashes and was ejected as droplets. I didn't. Therefore, the cleaning liquid of Comparative Example 1 cannot be ejected from the inkjet head to print on the substrate, and when the inkjet head is cleaned using the cleaning liquid of Comparative Example 1, the inkjet ink must be actually ejected thereafter. It is not possible to check whether the outlet is blocked. The cleaning liquids of Comparative Examples 2 and 3 were inferior in cleanability.
　以下、本開示に係る発明のバリエーションを記載する。
［付記１］有機溶剤を含有し、インクジェットヘッドから吐出して基材へ印刷することが可能である、インクジェットヘッド洗浄液。
［付記２］金属粒子を含有するインクジェットインクを吐出するインクジェットヘッドの洗浄に用いる付記１に記載のインクジェットヘッド洗浄液。
［付記３］前記金属粒子は金属粒子の表面が有機保護剤で被覆された構成を有する表面修飾金属粒子を含有する、付記２に記載のインクジェットヘッド洗浄液。
［付記４］前記有機保護剤は、官能基（特に、カルボキシ基、アミノ基、スルホ基、およびチオール基からなる群より選択される少なくとも１種の官能基）を有する有機化合物である、付記３に記載のインクジェットヘッド洗浄液。
［付記５］前記有機保護剤の炭素原子数は４～２４（好ましくは６～２２、より好ましくは１０～２０）である付記３または４に記載のインクジェットヘッド洗浄液。
［付記６］前記金属粒子の平均一次粒子径は１０００μｍ未満（好ましくは１０００ｎｍ未満、より好ましくは１００ｎｍ以下、さらに好ましくは８０ｎｍ以下、さらに好ましくは７０ｎｍ以下、特に好ましくは６０ｎｍ以下）である付記２～５のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記７］前記金属粒子の平均一次粒子径は０．５ｎｍ以上（好ましくは１ｎｍ以上）である付記２～６のいずれか１つに記載のインクジェットヘッド洗浄液。 Variations of the invention according to the present disclosure are described below.
[Appendix 1] An inkjet head cleaning liquid containing an organic solvent and capable of being ejected from an inkjet head and printed onto a substrate.
[Appendix 2] The inkjet head cleaning liquid according to Appendix 1, which is used for cleaning an inkjet head that ejects an inkjet ink containing metal particles.
[Appendix 3] The inkjet head cleaning liquid according to Appendix 2, wherein the metal particles contain surface-modified metal particles having a structure in which the surfaces of the metal particles are coated with an organic protective agent.
[Appendix 4] The organic protective agent is an organic compound having a functional group (in particular, at least one functional group selected from the group consisting of a carboxy group, an amino group, a sulfo group, and a thiol group). 3. The inkjet head cleaning liquid described in .
[Appendix 5] The inkjet head cleaning liquid according to Appendix 3 or 4, wherein the number of carbon atoms in the organic protective agent is 4 to 24 (preferably 6 to 22, more preferably 10 to 20).
[Appendix 6] The average primary particle diameter of the metal particles is less than 1000 μm (preferably less than 1000 nm, more preferably 100 nm or less, still more preferably 80 nm or less, even more preferably 70 nm or less, particularly preferably 60 nm or less). 6. The inkjet head cleaning liquid according to any one of 5.
[Appendix 7] The inkjet head cleaning liquid according to any one of Appendices 2 to 6, wherein the metal particles have an average primary particle size of 0.5 nm or more (preferably 1 nm or more).
［付記８］前記金属粒子を分散するための分散剤を含有し、前記分散剤の炭素原子数は、前記金属粒子の表面を保護する有機保護剤の炭素原子数よりも多い、付記２～７のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記９］前記金属粒子を分散するための分散剤を含有し、前記分散剤は前記有機保護剤が有する官能基を有する、付記２～８のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記１０］金属粒子を分散するための分散剤を含有する付記１～７のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記１１］前記分散剤は、官能基（特に、カルボキシ基、アミノ基、スルホ基、およびチオール基からなる群より選択される少なくとも１種の官能基）を有する化合物である、付記８～１０のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記１２］前記分散剤の炭素原子数は４～２４（好ましくは６～２２、より好ましくは１０～２０）である付記８～１１のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記１３］前記分散剤はアミン（好ましくは炭素原子数８以上の飽和または不飽和の脂肪族炭化水素モノアミン化合物、より好ましくは炭素原子数８以上の直鎖状脂肪族炭化水素モノアミン、さらに好ましくは炭素原子数８～１８の直鎖状脂肪族炭化水素モノアミン）である、付記８～１２のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記１４］前記分散剤の含有割合は、前記インクジェットヘッド洗浄液の総量に対して、０．１～１０質量％（好ましくは０．３～８質量％、より好ましくは０．５～６質量％）である、付記８～１３のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記１５］前記分散剤は融点が２０℃以上である付記８～１４のいずれか１つに記載のインクジェットヘッド洗浄液。 [Appendix 8] Appendices 2 to 7, containing a dispersant for dispersing the metal particles, wherein the number of carbon atoms in the dispersant is greater than the number of carbon atoms in the organic protective agent that protects the surface of the metal particles. The inkjet head cleaning liquid according to any one of.
[Appendix 9] The inkjet head cleaning liquid according to any one of Appendices 2 to 8, which contains a dispersant for dispersing the metal particles, and the dispersant has a functional group possessed by the organic protective agent.
[Appendix 10] The inkjet head cleaning liquid according to any one of Appendices 1 to 7, which contains a dispersant for dispersing the metal particles.
[Appendix 11] Appendices 8 to 10, wherein the dispersant is a compound having a functional group (in particular, at least one functional group selected from the group consisting of a carboxy group, an amino group, a sulfo group, and a thiol group). The inkjet head cleaning liquid according to any one of.
[Appendix 12] The inkjet head cleaning liquid according to any one of Appendices 8 to 11, wherein the dispersant has 4 to 24 carbon atoms (preferably 6 to 22, more preferably 10 to 20).
[Appendix 13] The dispersant is an amine (preferably a saturated or unsaturated aliphatic hydrocarbon monoamine compound having 8 or more carbon atoms, more preferably a linear aliphatic hydrocarbon monoamine having 8 or more carbon atoms, further preferably is a linear aliphatic hydrocarbon monoamine having 8 to 18 carbon atoms).
[Appendix 14] The content of the dispersant is 0.1 to 10% by mass (preferably 0.3 to 8% by mass, more preferably 0.5 to 6% by mass) relative to the total amount of the inkjet head cleaning liquid. ), the inkjet head cleaning liquid according to any one of Appendices 8 to 13.
[Appendix 15] The inkjet head cleaning liquid according to any one of Appendices 8 to 14, wherein the dispersant has a melting point of 20° C. or higher.
［付記１６］前記有機溶剤はインクジェットインクに含まれる粒子に対して相互作用を有する官能基を（好ましくは、カルボキシ基、アミノ基、スルホ基、およびチオール基）を有しない、付記１～１５のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記１７］前記有機溶剤は炭化水素を含有する付記１～１６のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記１８］前記炭化水素は、直鎖または分岐鎖状の脂肪族炭化水素、または、脂環を有する炭化水素（好ましくは脂環を有する炭化水素）を含有する、付記１７に記載のインクジェットヘッド洗浄液。
［付記１９］前記直鎖または分岐鎖状の脂肪族炭化水素における炭素原子数は６以上（好ましくは１０以上、より好ましくは１２以上）である、付記１８に記載のインクジェットヘッド洗浄液。
［付記２０］前記脂環を有する炭化水素における炭素原子数は６以上（好ましくは１０以上）である付記１８または１９に記載のインクジェットヘッド洗浄液。
［付記２１］前記有機溶剤はアルコールを含有する付記１～２０のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記２２］前記アルコールは環状構造を有するアルコール（特に、脂環を有するアルコール）を含有する付記２１に記載のインクジェットヘッド洗浄液。
［付記２３］前記アルコールは脂環を有するアルコールを含有し、前記脂環を有するアルコールにおける炭素原子数は６以上である付記２２に記載のインクジェットヘッド洗浄液。
［付記２４］前記アルコールの価数は１～２（好ましくは１）である付記２１～２３のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記２５］前記アルコールは直鎖または分岐鎖状のアルコールを含有し、前記直鎖または分岐鎖状のアルコールにおける炭素原子数は４以上（好ましくは６以上）である付記２１～２４のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記２６］前記有機溶剤の含有割合は、前記インクジェットヘッド洗浄液の総量に対して、５０質量％以上（好ましくは８０質量％、より好ましくは９０質量％以上、さらに好ましくは９５質量％以上）である、付記１～２５のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記２７］前記有機溶剤は炭化水素およびアルコールを含有する付記１～２６のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記２８］前記炭化水素と前記アルコールの質量比は３０：７０～９０：１０（好ましくは４０：６０～８０：２０、より好ましくは５５：４５～７０：３０）である、付記２７に記載のインクジェットヘッド洗浄液。 [Appendix 16] The organic solvent of Appendices 1 to 15, wherein the organic solvent does not have a functional group (preferably a carboxy group, an amino group, a sulfo group, and a thiol group) that interacts with the particles contained in the inkjet ink. The inkjet head cleaning liquid according to any one of the above.
[Appendix 17] The inkjet head cleaning liquid according to any one of Appendices 1 to 16, wherein the organic solvent contains a hydrocarbon.
[Appendix 18] The inkjet head according to Appendix 17, wherein the hydrocarbon contains a linear or branched aliphatic hydrocarbon or a hydrocarbon having an alicyclic ring (preferably a hydrocarbon having an alicyclic ring). washing liquid.
[Appendix 19] The inkjet head cleaning liquid according to Appendix 18, wherein the number of carbon atoms in the linear or branched aliphatic hydrocarbon is 6 or more (preferably 10 or more, more preferably 12 or more).
[Supplementary Note 20] The inkjet head cleaning liquid according to Supplementary Note 18 or 19, wherein the number of carbon atoms in the hydrocarbon having an alicyclic ring is 6 or more (preferably 10 or more).
[Appendix 21] The inkjet head cleaning liquid according to any one of Appendices 1 to 20, wherein the organic solvent contains alcohol.
[Appendix 22] The inkjet head cleaning liquid according to Appendix 21, wherein the alcohol contains an alcohol having a cyclic structure (especially an alcohol having an alicyclic ring).
[Appendix 23] The inkjet head cleaning liquid according to Appendix 22, wherein the alcohol contains an alcohol having an alicyclic ring, and the number of carbon atoms in the alcohol having an alicyclic ring is 6 or more.
[Appendix 24] The inkjet head cleaning liquid according to any one of Appendices 21 to 23, wherein the alcohol has a valence of 1 to 2 (preferably 1).
[Appendix 25] Any one of Appendices 21 to 24, wherein the alcohol contains a straight-chain or branched-chain alcohol, and the number of carbon atoms in the straight-chain or branched-chain alcohol is 4 or more (preferably 6 or more). 1. The inkjet head cleaning liquid according to 1 above.
[Appendix 26] The content of the organic solvent is 50% by mass or more (preferably 80% by mass, more preferably 90% by mass or more, and still more preferably 95% by mass or more) relative to the total amount of the inkjet head cleaning liquid. 26. The inkjet head cleaning liquid according to any one of Appendices 1 to 25.
[Appendix 27] The inkjet head cleaning liquid according to any one of Appendices 1 to 26, wherein the organic solvent contains a hydrocarbon and an alcohol.
[Appendix 28] According to Appendix 27, the weight ratio of the hydrocarbon to the alcohol is 30:70 to 90:10 (preferably 40:60 to 80:20, more preferably 55:45 to 70:30). Inkjet head cleaning liquid.
［付記２９］融点が２０℃以上である成分を含有する付記１～２８のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記３０］前記融点が２０℃以上である成分の融点は１００℃以下（好ましくは６０℃以下、より好ましくは４０℃以下）である付記２９に記載のインクジェットヘッド洗浄液。
［付記３１］前記融点が２０℃以上である成分の含有割合は、前記インクジェットヘッド洗浄液の総量に対して、０．１～１０質量％（好ましくは０．３～８質量％、より好ましくは０．５～６質量％）である、付記２９または３０に記載のインクジェットヘッド洗浄液。 [Appendix 29] The inkjet head cleaning liquid according to any one of Appendices 1 to 28, which contains a component having a melting point of 20° C. or higher.
[Appendix 30] The inkjet head cleaning liquid according to Appendix 29, wherein the melting point of the component having a melting point of 20° C. or higher is 100° C. or lower (preferably 60° C. or lower, more preferably 40° C. or lower).
[Appendix 31] The content of the component having a melting point of 20°C or higher is 0.1 to 10% by mass (preferably 0.3 to 8% by mass, more preferably 0% by mass) relative to the total amount of the inkjet head cleaning liquid. .5 to 6% by mass).
［付記３２］２３℃における粘度が２．５ｍＰａ・ｓ以上（好ましくは２．８ｍＰａ・ｓ以上、より好ましくは３．０ｍＰａ・ｓ以上）である付記１～３１のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記３３］表面張力が２５．８°以上（好ましくは２６．０°以上）である付記１～３２のいずれか１つに記載のインクジェットヘッド洗浄液。
［付記３４］付記１～３３に記載のインクジェットヘッド洗浄液を洗浄対象であるインクジェットヘッドより吐出して基材へ印刷することで吐出口の閉塞状況を確認する、吐出口閉塞状況の確認方法。 [Appendix 32] The inkjet according to any one of Appendices 1 to 31, wherein the viscosity at 23° C. is 2.5 mPa·s or more (preferably 2.8 mPa·s or more, more preferably 3.0 mPa·s or more). head cleaning liquid.
[Appendix 33] The inkjet head cleaning liquid according to any one of Appendices 1 to 32, which has a surface tension of 25.8° or more (preferably 26.0° or more).
[Appendix 34] A method for confirming a clogged state of an ejection port by ejecting the inkjet head cleaning liquid according to any one of Appendices 1 to 33 from an inkjet head to be cleaned and printing on a substrate to check the state of clogging of the ejection port.
　本開示のインクジェットヘッド洗浄液によれば、インクジェットヘッドの洗浄後、実際にインクジェットインクの吐出を試みなくても吐出口の閉塞状況を確認することができ、インクジェットヘッドの洗浄が容易となり、洗浄時間を節約することができる。従って、本開示は、産業上の利用可能性を有する。 According to the inkjet head cleaning liquid of the present disclosure, after cleaning the inkjet head, it is possible to check the clogged state of the ejection port without actually trying to eject the inkjet ink, and the cleaning of the inkjet head becomes easy, and the cleaning time is reduced. can save money. Therefore, the present disclosure has industrial applicability.

Claims (12)

  1. 　有機溶剤を含有し、インクジェットヘッドから吐出して基材へ印刷することが可能である、インクジェットヘッド洗浄液。 An inkjet head cleaning liquid that contains an organic solvent and can be ejected from an inkjet head and printed on a substrate.
  2. 　金属粒子を含有するインクジェットインクを吐出するインクジェットヘッドの洗浄に用いる請求項１に記載のインクジェットヘッド洗浄液。 The inkjet head cleaning liquid according to claim 1, which is used for cleaning an inkjet head that ejects an inkjet ink containing metal particles.
  3. 　金属粒子を分散するための分散剤を含有する請求項１または２に記載のインクジェットヘッド洗浄液。 The inkjet head cleaning liquid according to claim 1 or 2, which contains a dispersant for dispersing metal particles.
  4. 　前記分散剤は、カルボキシ基、アミノ基、スルホ基、およびチオール基からなる群より選択される少なくとも１種の官能基を有する化合物である、請求項３に記載のインクジェットヘッド洗浄液。 The inkjet head cleaning liquid according to claim 3, wherein the dispersant is a compound having at least one functional group selected from the group consisting of a carboxy group, an amino group, a sulfo group, and a thiol group.
  5. 　前記金属粒子は金属粒子の表面が有機保護剤で被覆された構成を有する表面修飾金属粒子を含有し、前記分散剤は前記有機保護剤が有する官能基を有する、請求項３に記載のインクジェットヘッド洗浄液。 4. The inkjet head according to claim 3, wherein the metal particles contain surface-modified metal particles having a structure in which the surfaces of the metal particles are coated with an organic protective agent, and the dispersant has a functional group possessed by the organic protective agent. washing liquid.
  6. 　２３℃における粘度が２．５ｍＰａ・ｓ以上である請求項１または２に記載のインクジェットヘッド洗浄液。 The inkjet head cleaning liquid according to claim 1 or 2, which has a viscosity of 2.5 mPa·s or more at 23°C.
  7. 　表面張力が２５．８°以上である請求項１または２に記載のインクジェットヘッド洗浄液。 The inkjet head cleaning liquid according to claim 1 or 2, which has a surface tension of 25.8° or more.
  8. 　前記有機溶剤は炭化水素およびアルコールを含有する請求項１に記載のインクジェットヘッド洗浄液。 The inkjet head cleaning liquid according to claim 1, wherein the organic solvent contains hydrocarbon and alcohol.
  9. 　前記炭化水素は脂環を有する炭化水素を含有する請求項８に記載のインクジェットヘッド洗浄液。 The inkjet head cleaning liquid according to claim 8, wherein the hydrocarbon contains a hydrocarbon having an alicyclic ring.
  10. 　前記アルコールは脂環を有するアルコールを含有する請求項８または９に記載のインクジェットヘッド洗浄液。 The inkjet head cleaning liquid according to claim 8 or 9, wherein the alcohol contains an alcohol having an alicyclic ring.
  11. 　融点が２０℃以上である成分を含有する請求項１または２に記載のインクジェットヘッド洗浄液。 The inkjet head cleaning liquid according to claim 1 or 2, which contains a component having a melting point of 20°C or higher.
  12. 　請求項１または２に記載のインクジェットヘッド洗浄液を洗浄対象であるインクジェットヘッドより吐出して基材へ印刷することで吐出口の閉塞状況を確認する、吐出口閉塞状況の確認方法。 A method for checking the clogged state of the ejection port by ejecting the inkjet head cleaning liquid according to claim 1 or 2 from the inkjet head to be cleaned and printing on the base material to check the clogged state of the ejection port.
PCT/JP2022/028498 2021-08-03 2022-07-22 Inkjet head cleaning solution WO2023013448A1 (en)

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* Cited by examiner, † Cited by third party
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JP2012135746A (en) * 2010-12-27 2012-07-19 Seiko Epson Corp Droplet discharge device and method for cleaning droplet discharge device
JP2017066228A (en) * 2015-09-29 2017-04-06 出光興産株式会社 Washing liquid for metal particle-containing inkjet ink and method for washing inkjet recording apparatus using said washing liquid for metal particle-containing inkjet ink
JP2020080400A (en) * 2018-11-13 2020-05-28 株式会社ダイセル Optical member, laser module and laser device including optical member
JP2021011071A (en) * 2019-07-05 2021-02-04 株式会社リコー Liquid ejection device, and method for detecting non-ejection nozzle of liquid ejection device
JP2021020985A (en) * 2019-07-25 2021-02-18 理想科学工業株式会社 Cleaning fluid and cleaning method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012135746A (en) * 2010-12-27 2012-07-19 Seiko Epson Corp Droplet discharge device and method for cleaning droplet discharge device
JP2017066228A (en) * 2015-09-29 2017-04-06 出光興産株式会社 Washing liquid for metal particle-containing inkjet ink and method for washing inkjet recording apparatus using said washing liquid for metal particle-containing inkjet ink
JP2020080400A (en) * 2018-11-13 2020-05-28 株式会社ダイセル Optical member, laser module and laser device including optical member
JP2021011071A (en) * 2019-07-05 2021-02-04 株式会社リコー Liquid ejection device, and method for detecting non-ejection nozzle of liquid ejection device
JP2021020985A (en) * 2019-07-25 2021-02-18 理想科学工業株式会社 Cleaning fluid and cleaning method

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