WO2022211045A1 - メンテナンス液、及びそれを使用したインクジェット記録装置のメンテナンス方法 - Google Patents

メンテナンス液、及びそれを使用したインクジェット記録装置のメンテナンス方法 Download PDF

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Publication number
WO2022211045A1
WO2022211045A1 PCT/JP2022/016611 JP2022016611W WO2022211045A1 WO 2022211045 A1 WO2022211045 A1 WO 2022211045A1 JP 2022016611 W JP2022016611 W JP 2022016611W WO 2022211045 A1 WO2022211045 A1 WO 2022211045A1
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Prior art keywords
maintenance liquid
solvent
maintenance
organic solvent
liquid according
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Ceased
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PCT/JP2022/016611
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English (en)
French (fr)
Japanese (ja)
Inventor
圭士郎 吉森
由佳 折笠
貴生 松本
公淳 宇高
充功 田村
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DNP Fine Chemicals Co Ltd
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DNP Fine Chemicals Co Ltd
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Priority to EP22781255.9A priority Critical patent/EP4316858A4/en
Publication of WO2022211045A1 publication Critical patent/WO2022211045A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
    • B41J2/16517—Cleaning of print head nozzles
    • B41J2/16552—Cleaning of print head nozzles using cleaning fluids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/36—Inkjet printing inks based on non-aqueous solvents
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/40—Ink-sets specially adapted for multi-colour inkjet printing
    • 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
    • C11D11/00—Special methods for preparing compositions containing mixtures of detergents
    • 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
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2096—Heterocyclic compounds
    • 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
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/26—Organic compounds containing nitrogen
    • C11D3/32—Amides; Substituted amides
    • 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
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/43—Solvents
    • 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
    • C11D7/5004—Organic solvents
    • C11D7/5013—Organic solvents containing nitrogen
    • 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
    • C11D7/5004—Organic solvents
    • C11D7/5022—Organic solvents 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
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/14—Hard surfaces
    • C11D2111/20—Industrial or commercial equipment, e.g. reactors, tubes or engines
    • 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
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/14—Hard surfaces
    • C11D2111/22—Electronic devices, e.g. PCBs or semiconductors

Definitions

  • the present invention relates to a maintenance liquid and a maintenance method for an inkjet recording apparatus using the same.
  • inkjet ink compositions include water-based ink compositions in which a coloring material is dissolved or dispersed in water or a mixture of water and an organic solvent, and non-aqueous ink compositions in which a coloring material is dissolved or dispersed in an organic solvent that does not contain water. Ink compositions are widely used.
  • the ink cannot be supplied. may be hindered, or ink ejection failure may occur. Therefore, there is known a maintenance liquid that is caused to flow through an ink flow path through which an ink composition in an inkjet recording apparatus is circulated.
  • the components derived from the ink composition are solid components including coloring material components and resins contained in the ink composition ejected by the inkjet recording apparatus, metal compounds derived from metals contained as impurities, and the like. Further, the component derived from the device member is a precipitate or the like of the device member generated by dissolving only a small part of the device member with the ink composition.
  • Patent Document 1 describes a maintenance liquid containing two or more organic solvents having a predetermined relationship. According to Patent Document 1, this maintenance liquid is excellent in drying and moisturizing properties.
  • Patent Document 2 describes a maintenance liquid containing a lactone-based solvent and an alkylene glycol monoether-based solvent that accounts for 30% by mass or more of the total mass of the solvent-based maintenance liquid.
  • Patent Literature 1 describes that this maintenance liquid has reduced attack on members and is suitable for cleaning an inkjet recording apparatus that uses ink containing an organic solvent as a main component.
  • the maintenance liquid used in such an inkjet recording apparatus comes into contact with constituent members inside the inkjet recording apparatus during use. Therefore, member suitability for such members is required.
  • the maintenance liquid is used to remove components derived from the ink composition adhering to the inside of the ink flow path, etc., and is also required to have cleaning properties for cleaning the ink flow path.
  • the maintenance liquid may remain filled for a long period of time in the plastic container or plastic supply body inside the inkjet recording apparatus.
  • the organic solvent contained in the maintenance liquid may volatilize, degrading the moisture retention.
  • the components derived from the washed ink composition are deposited again, and as a result, the ink composition adhering to the member may not be removed.
  • the maintenance liquid used in such an inkjet recording apparatus is used to remove components derived from the ink composition adhering to the inside of the ink flow path, etc., and has cleaning properties for cleaning the ink flow path. requested.
  • the maintenance liquid comes into contact with the inkjet head of the inkjet recording device during use.
  • the inkjet head has components adhered by a cured resin material, and when the maintenance liquid passes through the inkjet head, the wiping member impregnated with the maintenance liquid comes into contact with the nozzle openings of the inkjet head.
  • This cured resin sometimes comes into contact with the maintenance liquid. For this reason, the maintenance liquid is required to have member suitability for such resin cured products.
  • An object of the present invention is to provide a maintenance liquid that is highly suitable for members constituting an inkjet recording apparatus and has excellent cleaning properties.
  • Another object of the present invention is to provide a maintenance liquid that is excellent in moisturizing properties in a plastic container and a plastic feeder in an inkjet recording apparatus.
  • a further object of the present invention is to provide a maintenance liquid that is highly suitable for members with respect to cured resins and has excellent cleaning properties.
  • the present inventors have made intensive studies and found that a maintenance liquid containing at least one amide-based solvent or lactone-based solvent and having a water content controlled to a predetermined range or less is used. If there is, we found that the above problems can be solved, and completed the present invention.
  • the present inventors conducted extensive research and found that the above-mentioned problems can be solved by a maintenance liquid containing an organic solvent with a volatilization rate of a predetermined value or less in a storage test. and completed the present invention.
  • a maintenance liquid used in an inkjet recording apparatus which contains an organic solvent and has a water content of 5% by mass or less in the total amount of the maintenance liquid, and the organic solvent is an amide solvent or a lactone solvent.
  • a maintenance liquid containing at least one.
  • the alkylamide solvent contains at least one selected from the group consisting of N,N-diethylformamide, N,N-diethylpropanamide, and N,N-diethylacetamide; Maintenance fluid as described.
  • a maintenance liquid used in an inkjet recording apparatus containing an organic solvent A2, the organic solvent A2 having a boiling point of 250° C. or less, and having a volatilization rate of 15% by mass in the storage test described below.
  • Maintenance fluid which is: Storage test: A low-density polyethylene tube is filled with organic solvent A2, sealed, and stored at 50°C for one week.
  • the maintenance liquid according to (15) or (16), which contains an amide solvent, and the amide solvent is represented by the following formula (2-2).
  • R 1 is hydrogen or an alkyl group having 1 to 4 carbon atoms
  • R 2 R 3 each independently represents hydrogen or an alkyl group having 1 to 4 carbon atoms. show.
  • Organic solvent A3 at least one selected from the group consisting of alkylamide solvents (a1), cyclic amide solvents (a2), and lactone solvents (a3)
  • the alkylamide solvent (a1) contains at least one selected from the group consisting of N,N-diethylformamide, N,N-diethylpropanamide and N,N-diethylacetamide (26) Maintenance liquid described in .
  • the lactone solvent (a3) contains at least one selected from the group consisting of ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -valerolactone, ⁇ -hexanolactone, and ⁇ -caprolactone ( 30) The maintenance liquid described in 30).
  • a maintenance method for an inkjet recording apparatus wherein maintenance of the inkjet recording apparatus is performed using the maintenance liquid according to any one of (1) to (34).
  • the maintenance liquid of the present invention has high suitability for members constituting an inkjet recording apparatus, and is excellent in washability.
  • the maintenance liquid of the present invention has excellent moisturizing properties in the plastic container and the plastic supply body in the inkjet recording apparatus.
  • the maintenance liquid of the present invention has high member suitability for cured resins and excellent cleaning properties.
  • FIG. 1 is a schematic diagram (cross-sectional view) showing an example of an inkjet head using a maintenance liquid according to an embodiment
  • the maintenance liquid of the present invention is a maintenance liquid used in an inkjet recording apparatus.
  • the term "used in an inkjet recording apparatus” means used to remove components originating from the ink composition adhering to the ink flow path in the inkjet recording apparatus or to the inkjet head.
  • the maintenance liquid according to this embodiment is a maintenance liquid used in an inkjet recording apparatus.
  • the maintenance liquid according to the present embodiment is a non-aqueous maintenance liquid containing an organic solvent and having a water content of 5% by mass or less in the total amount of the maintenance liquid, wherein the organic solvent is an amide solvent or It is characterized by containing at least one lactone solvent.
  • the maintenance liquid has high suitability for members constituting the inkjet recording apparatus and excellent cleaning properties.
  • the water content is preferably 3.0% by mass or less, more preferably 2.0% by mass or less, and even more preferably 1.5% by mass or less in the total amount of the maintenance liquid.
  • Organic solvent has the function of cleaning clogged ink channels.
  • This organic solvent contains at least one amide solvent or lactone solvent. By containing at least one of the amide-based solvent and the lactone-based solvent, the cleaning properties of the maintenance liquid can be improved.
  • the total content of the amide-based solvent and the lactone-based solvent is not particularly limited, but the lower limit of the total content of the amide-based solvent and the lactone-based solvent is preferably 7% by mass or more in the total amount of the maintenance liquid. It is more preferably at least 15% by mass, even more preferably at least 15% by mass. With such a range, the washability of the maintenance liquid can be more effectively improved.
  • the upper limit of the total content of the amide solvent and the lactone solvent is preferably 90% by mass or less, more preferably 80% by mass or less, and preferably 70% by mass or less. Within such a range, the member suitability for the members constituting the inkjet recording apparatus is further improved.
  • R 1 is hydrogen or an alkyl group having 1 to 4 carbon atoms
  • R 2 R 3 each independently represents hydrogen or an alkyl group having 1 to 4 carbon atoms. show.
  • R 2 and R 3 in formula (1-1) are preferably alkyl groups having 1 to 4 carbon atoms, and more preferably alkyl groups having 2 to 4 carbon atoms.
  • alkylamide solvents include N,N-diethylformamide, N,N-diethylacetamide, N,N-dipropylformamide, N,N-dibutylformamide, N,N-diethylpropanamide, N , N-dipropylpropanamide, N-ethylformamide, N-ethylacetamide and the like.
  • a cyclic amide-based solvent having, for example, the following structure can be preferably used.
  • R 4 is an alkylene group having 3 to 5 carbon atoms
  • R 5 represents hydrogen, an alkyl group having 1 to 2 carbon atoms, or an unsaturated hydrocarbon group.
  • cyclic amide solvents include 3-methyl-2-oxazolidinone, 3-ethyl-2-oxazolidinone, N-vinylmethyloxazolidinone, N-methylcaprolactam, N-ethylcaprolactam, N-propylcaprolactam, N -acetylcaprolactam, ⁇ -caprolactam, N-vinylcaprolactam, 2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-propyl-2-pyrrolidone and the like. Among them, it is preferable to contain at least one selected from the group consisting of ⁇ -caprolactam, N-methylcaprolactam, and N-vinylcaprolactam.
  • the content of the amide-based solvent is not particularly limited, but the lower limit of the content of the amide-based solvent is preferably in the range of 7% by mass or more, and in the range of 10% by mass or more, based on the total amount of the non-aqueous maintenance liquid. is more preferable, and the range of 15% by mass or more is even more preferable.
  • the upper limit of the content of the amide-based solvent is preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 70% by mass or less in the total amount of the maintenance liquid.
  • Lactone Solvent is a solvent having a cyclic ester structure. By containing the lactone-based solvent, the cleaning properties of the maintenance liquid can be improved.
  • lactone-based solvent for example, a lactone-based solvent having the following structure can be preferably used.
  • R 6 is an alkylene group having 3 to 5 carbon atoms
  • R 7 represents hydrogen or an alkyl group having 1 to 2 carbon atoms.
  • R 6 is preferably 4 or more and 5 or less, and more preferably 5.
  • a maintenance liquid containing such a lactone-based solvent can further improve suitability for members constituting an inkjet recording apparatus, and can also improve moisture retention. If the maintenance liquid has moisturizing properties, volatilization of the maintenance liquid in the inkjet recording apparatus can be suppressed, so deposition of solid components derived from the ink composition due to volatilization of the maintenance liquid after cleaning can be suppressed. becomes possible.
  • lactone solvents examples include ⁇ -valerolactone, ⁇ -hexanolactone, ⁇ -caprolactone, ⁇ -valerolactone, ⁇ -hexalactone, ⁇ -heptalactone, ⁇ -octalactone, ⁇ -nonalactone, ⁇ - Examples include lactone solvents having a 6-membered ring or more, such as decalactone and ⁇ -undecalactone.
  • the content of the lactone-based solvent is not particularly limited, but the lower limit of the content of the lactone-based solvent is preferably in the range of 7% by mass or more, more preferably 10% by mass or more, based on the total amount of the maintenance liquid. Preferably, it is more preferably in the range of 15% by mass or more.
  • the upper limit of the content of the lactone-based solvent is preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 70% by mass or less in the total amount of the maintenance liquid.
  • the maintenance liquid according to the present embodiment is characterized in that the organic solvent contains at least one amide-based solvent or lactone-based solvent. Among them, it is preferable to contain an amide solvent, and among the amide solvents, it is more preferable to contain an alkylamide solvent, and it is preferable to contain an alkylamide solvent represented by formula (1-1). is even more preferred. As a result, the maintenance liquid according to the present embodiment exhibits the effects of the present invention particularly effectively, and furthermore has better suitability for members constituting the inkjet recording apparatus.
  • the maintenance liquid according to the present embodiment may contain organic solvents other than the above amide-based solvents and lactone-based solvents.
  • organic solvents include glycol ether solvents and carbonate esters. Among these, it is preferable to contain a glycol ether solvent.
  • Glycol ether-based solvents include glycol ether dialkyl in which OH groups at both ends of glycol are alkyl-substituted, and glycol ether monoalkyl in which one OH group of glycol is alkyl-substituted.
  • Glycol ether solvents include, for example, glycol ether solvents represented by the following formula (1-4).
  • R 8 (—OR 9 ) n —OR 10 (1-4)
  • R 8 and R 10 are each independently hydrogen or an optionally branched alkyl group having 1 to 8 carbon atoms, and R 9 has 1 to 4 carbon atoms. represents an alkylene group that may be branched, and n represents an integer of 1 or more and 6 or less.
  • glycol ether solvents examples include diethylene glycol mono-n-butyl ether, dipropylene glycol monopropyl ether, diethylene glycol monoethyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, triethylene glycol mono-n-butyl ether, and tetraethylene.
  • Glycol ether monoalkyl such as glycol monobutyl ether, pentaethylene glycol monobutyl ether, hexaethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol dibutyl ether , dipropylene glycol dimethyl ether, diethylene glycol isopropyl methyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, and tetraethylene glycol diethyl ether.
  • Carbonic acid esters include propylene carbonate and ethylene carbonate.
  • Lactate esters include methyl lactate, ethyl lactate, butyl lactate, propyl lactate, ethylhexyl lactate, amyl lactate, and isoamyl lactate.
  • dibasic acid esters examples include dimethyl malonate, diethyl malonate, dipropyl malonate, dimethyl succinate, diethyl succinate, dimethyl glutarate, diethyl glutarate, and dimethyl adipate.
  • solvents other than glycol ether solvents, carbonate esters, lactate esters, and dibasic acid esters may be contained.
  • alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, acetone, methyl ethyl ketone, methyl-n-propyl ketone, methyl isopropyl ketone, methyl-n-butyl ketone, methyl isobutyl ketone, methyl-n-amyl ketone, methylhexyl ketone, methyl isoamyl ketone, diethyl ketone, ethyl-n-propyl ketone, ethyl isopropyl ketone, ethyl-n-butyl ketone, ethyl isobutyl ketone, di-n-propyl ketone, diis
  • glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol and dipropylene glycol
  • acetates such as ethylene glycol monobutyl ether acetate, 2-methylbutyl acetate, 3-methoxybutyl ether acetate and cyclohexyl acetate
  • -Saturated hydrocarbons such as hexane, isohexane, n-nonane, isononane, dodecane and isododecane, unsaturated hydrocarbons such as 1-hexene, 1-heptene and 1-octene, cyclohexane, cycloheptane, cyclooctane, cyclodecane
  • Cyclic saturated hydrocarbons such as decalin, cyclic unsaturated hydrocarbons such as cyclohexene, cycloheptene, cyclooctene, 1,1,3,5,7-cycl
  • the content of the other organic solvent is not particularly limited, but the lower limit of the content of the other organic solvent is preferably in the range of 10% by mass or more, and more preferably in the range of 20% by mass or more. , 30% by mass or more.
  • the upper limit of the content of other organic solvents is preferably 90% by mass or less, more preferably 85% by mass or less, and even more preferably 80% by mass or less.
  • the above organic solvent amide-based solvent, lactone-based solvent, or other organic solvent
  • enthalpy of vaporization is a calculated value determined using Advanced Chemistry Development (ACD/Labs) software, version 11.02.
  • an organic solvent with an enthalpy of vaporization (EOV) of 45 kJ/mol or more volatilization of the maintenance liquid in the inkjet recording apparatus can be suppressed. If the maintenance liquid volatilizes while the head is filled with the maintenance liquid, components derived from the ink composition remaining inside the head may precipitate, or air bubbles may enter the head. Therefore, normal printing may become difficult even after ink filling.
  • an organic solvent having an enthalpy of vaporization (EOV) of 45 kJ/mol or more in this way the maintenance liquid has improved moisturizing properties, making the maintenance liquid more suitable for use in inkjet recording apparatuses.
  • Organic solvents with an enthalpy of vaporization (EOV) of 45 kJ/mol or more include 3-methyl-2-oxazolidinone (50.4 kJ/mol), 3-ethyl-2-oxazolidinone (50.7 kJ/mol), and N-methylcaprolactam.
  • Dialkyl, carbonate ester such as propylene carbonate (47.8 kJ/mol), ethylene carbonate (49.0 kJ/mol), ethyl lactate (45.6 kJ/mol), butyl lactate (49.5 kJ/mol), propyl lactate ( 47.8 kJ/mol), lactate esters such as ethylhexyl lactate, amyl lactate (51.3 kJ/mol), isoamyl lactate (51.0 kJ/mol) and dipropyl malonate (46.6 kJ/mol) l), dibasic acid esters such as diethyl succinate (45.5 kJ/mol), diethyl glutarate (47.3 kJ/mol) and dimethyl adipate (46.5 kJ/mol).
  • the maintenance liquid according to this embodiment may contain a coloring material.
  • the coloring material is not particularly limited, and may be a dye-based coloring material or a pigment-based coloring material, but an organic pigment is preferable from the viewpoint of dispersibility in the maintenance liquid.
  • Pigments that can be used in the maintenance liquid according to the present embodiment are not particularly limited, and examples thereof include organic pigments that are used in conventional ink compositions. These may be used individually by 1 type, or may be used in combination of 2 or more type. Note that the maintenance liquid according to the present embodiment does not have to contain a coloring material.
  • the dispersion stability of the pigment can be improved by using a dispersant or dispersion aid (pigment derivative), which will be described later.
  • organic pigments include, for example, insoluble azo pigments, soluble azo pigments, derivatives from dyes, phthalocyanine-based organic pigments, quinacridone-based organic pigments, perylene-based organic pigments, perinone-based organic pigments, azomethine-based organic pigments, and anthraquinone-based pigments.
  • Organic pigments (anthrone-based organic pigments), xanthene-based organic pigments, diketopyrrolopyrrole-based organic pigments, dioxazine-based organic pigments, nickel azo-based pigments, isoindolinone-based organic pigments, pyranthrone-based organic pigments, thioindigo-based organic pigments, condensed azo organic solid solution pigments such as organic pigments, benzimidazolone organic pigments, quinophthalone organic pigments, isoindoline organic pigments, quinacridone solid solution pigments, perylene solid solution pigments, and other pigments such as lake pigments and carbon black. be done. The same applies to specific organic pigments contained in maintenance liquids of second and third embodiments, which will be described later.
  • C.I. color index
  • the content of the pigment is not particularly limited, but the lower limit of the content of the pigment is preferably in the range of 0.0005% by mass or more, more preferably 0.001% by mass or more, based on the total amount of the maintenance liquid. Preferably, it is more preferably in the range of 0.005% by mass or more.
  • the upper limit of the content of the pigment is preferably in the range of 0.5% by mass or less, more preferably 0.1% by mass or less, and 0.05% by mass or less in the total amount of the maintenance liquid. It is even more preferable to have
  • a dispersant may be used in the maintenance liquid according to the present embodiment, if necessary.
  • a polymer dispersant is preferably used.
  • Such a dispersant has a main chain of polyester, polyacrylic, polyurethane, polyamine, polycaprolactone, etc., and has a polar group such as an amino group, a carboxyl group, a sulfone group, or a hydroxyl group as a side chain. is.
  • polyacrylic dispersants for example, Disperbyk-2000, 2001, 2008, 2009, 2010, 2020, 2020N, 2022, 2025, 2050, 2070, 2095, 2150, 2151, 2155, 2163, 2164, BYKJET-9130, 9131 , 9132, 9133, 9151 (manufactured by Vic Chemie), Efka PX4310, PX4320, PX4330, PA4401, 4402, PA4403, 4570, 7411, 7477, PX4700, PX4701 (manufactured by BASF), TREPLUS D-1200, D-1410, D-1420, MD-1000 (manufactured by Otsuka Chemical Co., Ltd.), Floren DOPA-15BHFS, 17HF, 22, G-700, 900, NC-500, GW-1500 (manufactured by Kyoeisha Chemical Co., Ltd.), and the like are used.
  • Polycaprolactone-based dispersants include, for example, Ajisper PB821, PB822, PB881 (manufactured by Ajinomoto Fine-Techno Co., Ltd.), Hinoact KF-1000, T-6000, T-7000, T-8000, T-8000E, T-9050 ( Kawaken Fine Chemicals Co., Ltd.), Solsperse 20000, 24000, 32000, 32500, 32550, 32600, 33000, 33500, 34000, 35200, 36000, 37500, 39000, 71000, 76400, 76500, 86000, 88000, J10 TEGO Dispers 652, 655, 685, 688, 690 (manufactured by Evonik Japan) and the like are used.
  • the content of the dispersant is not particularly limited, but the lower limit of the content of the dispersant is preferably in the range of 0.0001% by mass or more, and in the range of 0.0005% by mass or more in the total amount of the maintenance liquid. is more preferable, and the range of 0.001% by mass or more is even more preferable.
  • the upper limit of the content of the dispersant is preferably 3.0% by mass or less, more preferably 1.0% by mass or less, and 0.5% by mass or less in the total amount of the maintenance liquid. is more preferable. The same applies to the dispersant contained in the maintenance liquid of second and third embodiments, which will be described later.
  • a dispersing aid may be used as necessary in the maintenance liquid according to the present embodiment.
  • the dispersing aid adheres to the surface of the coloring material (pigment), and the functional group increases the affinity with the organic solvent and dispersant in the maintenance liquid, improving the dispersion stability.
  • As the dispersing aid a known pigment derivative having a functional group such as an acidic group, a basic group, or a neutral group in the organic pigment residue can be used. The same applies to the dispersing aids contained in the maintenance liquids of second and third embodiments, which will be described later.
  • the maintenance liquid is used for the purpose of suppressing volatilization and solidification of the maintenance liquid in the device such as the nozzle part and the inside of the tube, and also for the purpose of resolubility when it solidifies, and also to reduce the surface tension.
  • a surfactant may be added for the purpose of improving washing performance.
  • acetylene glycol-based surfactants include Surfynol (registered trademark) 82, 104, 465, 485, TG (all manufactured by Air Products Japan), Olfine (registered trademark) STG, E1010 (all manufactured by Nissin Chemical Co., Ltd.) and the like are exemplified.
  • the maintenance liquid according to the present embodiment does not have to contain a surfactant. The same applies to surfactants contained in maintenance liquids of second and third embodiments, which will be described later.
  • the surfactant is not limited to the above, and any anionic, cationic, amphoteric or nonionic surfactant can be used, and may be appropriately selected according to the purpose of addition. The same applies to surfactants contained in maintenance liquids of second and third embodiments, which will be described later.
  • the maintenance liquid according to the present embodiment includes light stabilizers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicon, etc.), Known additives such as antifoaming agents, pH adjusters, bactericides, preservatives, deodorants, charge control agents, wetting agents, pigments and extenders may be included as optional components. The same applies to surfactants contained in maintenance liquids of second and third embodiments, which will be described later.
  • the maintenance liquid according to the present embodiment is a non-aqueous maintenance liquid having a water content of 5% by mass or less in the total amount of the maintenance liquid. With such a maintenance liquid, the maintenance liquid has excellent cleaning properties.
  • the maintenance liquid according to the present embodiment does not absorb moisture in the atmosphere as much as possible.
  • the water absorption amount is 4.0% by mass or less in the total amount of the maintenance liquid when placed in an environment of 25° C. and 55% humidity for 100 hours.
  • a maintenance liquid that absorbs as little moisture as possible from the atmosphere is a maintenance liquid with excellent cleaning properties, and components derived from the removed ink composition due to increased water content are generated again in the inkjet recording apparatus. can be suppressed.
  • the nozzle openings of an inkjet head when wiping the nozzle openings of an inkjet head by immersing the wiping member in the maintenance liquid, if the wiping member is immersed in the maintenance liquid that easily absorbs water and left in an open state, the nozzle openings are wiped off.
  • the ink composition adhering to the nozzle opening may partially aggregate due to moisture absorbed by the maintenance liquid. Then, the nozzle opening is clogged with the aggregate of the ink composition, and the nozzle becomes a non-ejecting nozzle.
  • glycol ether monoalkyl contains an OH group, so compared to glycol ether dialkyl, it is an organic solvent with relatively high water absorption. Therefore, for example, the content of the glycol ether monoalkyl contained in the maintenance liquid is not particularly limited, but is preferably 90% by mass or less, more preferably 70% by mass or less, more preferably 70% by mass or less, based on the total amount of the maintenance liquid. It is more preferably 45% by mass or less, even more preferably 35% by mass or less, and even more preferably 15% by mass or less.
  • the organic solvent in advance when manufacturing the maintenance liquid.
  • the amount of water contained in the maintenance liquid can be reduced.
  • the glycol ether monoalkyl having an —OH group is highly water absorbent and absorbs moisture in the air, so it is particularly preferable to dry the glycol ether monoalkyl in advance.
  • a method for drying the organic solvent for example, a method of spraying an inert gas (e.g., nitrogen gas) dried in an inert gas atmosphere such as nitrogen for a predetermined time, a method of distilling and refining the organic solvent, and water are selected.
  • an inert gas e.g., nitrogen gas
  • Examples include a method of allowing the organic solvent to permeate through a semi-permeable membrane that selectively permeates the organic solvent, and a method of selectively adsorbing water mixed in the organic solvent with a water adsorbent that adsorbs water.
  • the maintenance liquid according to this embodiment is a maintenance liquid used in an inkjet recording apparatus.
  • the maintenance liquid according to the present embodiment contains an organic solvent A2, and the organic solvent A2 is characterized by having a volatilization rate of 15% by mass or less in the following storage test.
  • a low-density polyethylene tube is filled with organic solvent A2, sealed, and stored at 50°C for one week.
  • a maintenance liquid containing such an organic solvent A2 can suppress volatilization in the plastic container and the plastic supply body in the inkjet recording apparatus, so that the maintenance liquid can be highly moisturizing.
  • a polyethylene tube hose manufactured by AS ONE (model number: 6-608-03, inner diameter 3 mm, outer diameter 5 mm) cut to 12 cm can be used.
  • the plastic container means a plastic container that contains the maintenance liquid
  • the plastic supplier means a plastic supplier that supplies the maintenance liquid
  • the plastic container is a cartridge that contains maintenance liquid
  • the plastic supply is a plastic tube that connects the cartridge and the inkjet head.
  • plastic container and plastic supplier mean that plastic members are used for at least some of the members that constitute them, and the plastic container and plastic supplier are plastic members. does not preclude inclusion of different members.
  • the material of the plastic member constituting at least part of the plastic container and the plastic supply body is not particularly limited as long as it is a resin, and examples thereof include polyolefin resin, ethylene propylene diene rubber, nylon, polyurethane, PTFE, and the like. It is preferable to use polyethylene resins and ethylene propylene diene rubbers, and among these, it is particularly preferable to use low density polyethylene resins.
  • Organic solvent A2 is a solvent having a volatilization rate of 15% by mass or less in the following storage test.
  • a low-density polyethylene tube is filled with organic solvent A2, sealed, and stored at 50°C for one week.
  • the volatilization rate in such a closed low-density polyethylene tube does not necessarily correlate with the volatility parameters of the organic solvent itself, such as boiling point, flash point, and evaporation enthalpy. This is because the permeability to plastics differs depending on the type of organic solvent, and the volatilization rate in a sealed low-density polyethylene tube is rather due to the permeability to plastics. Specifically, the chemical structure of the organic solvent, It is a parameter resulting from molecular weight, compatibility, and the like.
  • the organic solvent having a volatilization rate of 15% by mass or less in such a storage test contains at least one selected from the group consisting of glycol ether monoalkyl, cyclic esters, carbonate esters, and amide solvents. things can be mentioned.
  • glycol ether monoalkyl such as dipropylene glycol monomethyl ether (volatility rate is 10% by mass), tripropylene glycol monomethyl ether (volatility rate is 8% by mass), diethylene glycol monoethyl ether (volatility rate is 8% by mass), N , N-diethylformamide (volatility rate is 11% by mass), N,N-diethylpropanamide (volatility rate is 12% by mass), N,N-diethylacetamide (volatility rate is 13% by mass) and other amide solvents, Carbonic esters such as propylene carbonate (volatility is 1% by mass), ⁇ -butyrolactone (volatility is 6% by mass), cyclic esters such as ⁇ -caprolactone (3% by mass), 3-methoxy-1-butanol (volatility is 7% by mass) and the like.
  • Amide-based solvents have an excellent balance of volatility and moisture retention in a sealed space inside a plastic tube. Therefore, by using an amide-based solvent as the organic solvent A2, the maintenance liquid is excellent in moisture retention in the plastic container and the plastic supply body in the inkjet recording apparatus, and also excellent in drying property. If the maintenance liquid has excellent drying properties, it will be possible to quickly remove the maintenance liquid from the inkjet recording apparatus after washing, and it will be possible to quickly reuse the inkjet recording apparatus.
  • the maintenance liquid contains an amide-based solvent, it is possible to improve the washability of the maintenance liquid, and the suitability of components for inkjet recording apparatuses is also improved.
  • an alkylamide-based solvent as the amide-based solvent, the maintenance liquid can exhibit the above effects more effectively.
  • R 1 is hydrogen or an alkyl group having 1 to 4 carbon atoms
  • R 2 R 3 each independently represents hydrogen or an alkyl group having 1 to 4 carbon atoms. show.
  • R 2 and R 3 in formula (2-2) are preferably alkyl groups having 1 to 4 carbon atoms, more preferably alkyl groups having 2 to 4 carbon atoms.
  • alkylamide solvents include N,N-diethylformamide, N,N-diethylacetamide, N,N-dipropylformamide, N,N-dibutylformamide, N,N-diethylpropanamide, N , N-dipropylpropanamide, N-ethylformamide, N-ethylacetamide, and the like, those having a volatilization rate of 15% by mass or less under predetermined conditions in a sealed low-density polyethylene tube.
  • a cyclic ester is a solvent having a cyclic ester structure. Containing a cyclic ester can improve the washability of the maintenance liquid.
  • cyclic ester for example, a cyclic ester having the following structure can be preferably used.
  • R 6 is an alkylene group having 3 to 5 carbon atoms
  • R 7 represents hydrogen or an alkyl group having 1 to 2 carbon atoms.
  • R 6 is preferably 4 or more and 5 or less, and more preferably 5.
  • a maintenance liquid containing such a lactone-based solvent is more suitable for members constituting an inkjet recording apparatus.
  • lactone solvents examples include ⁇ -valerolactone, ⁇ -hexanolactone, ⁇ -caprolactone, ⁇ -valerolactone, ⁇ -hexalactone, ⁇ -heptalactone, ⁇ -octalactone, ⁇ -nonalactone, ⁇ -
  • lactone-based solvents having a 6-membered ring or more such as decalactone and ⁇ -undecalactone, those having a volatilization rate of 15% by mass or less under predetermined conditions in a sealed low-density polyethylene tube can be mentioned.
  • the organic solvent A2 may contain an organic solvent other than the above amide-based solvent and lactone-based solvent.
  • an organic solvent other than the above amide-based solvent and lactone-based solvent examples include glycol ether monoalkyl, carbonate, lactate, acetate, and alcohol, those having a volatilization rate of 15% by mass or less under predetermined conditions in a sealed low-density polyethylene tube can be mentioned. .
  • the lower limit of the content of the organic solvent A2 with respect to the total amount of the maintenance liquid is preferably in the range of 1% by mass or more, and 5% by mass or more with respect to the total amount of the maintenance liquid. is more preferable, more preferably 10% by mass or more, and even more preferably 15% by mass or more.
  • the upper limit of the content of the organic solvent A2 is preferably 95% by mass or less, more preferably 90% by mass or less, and 85% by mass or less with respect to the total amount of the maintenance liquid. is more preferred.
  • the organic solvent may contain other organic solvents other than the above organic solvent A2.
  • organic solvents other than the above organic solvent A2.
  • the content of the other organic solvent is not particularly limited, but the lower limit of the content of the other organic solvent is preferably in the range of 10% by mass or more, more preferably 20% by mass or more in the total amount of the maintenance liquid. is more preferable, and the range of 30% by mass or more is even more preferable.
  • the upper limit of the content of other organic solvents is preferably 90% by mass or less, more preferably 85% by mass or less, and preferably 80% by mass or less, based on the total amount of the maintenance liquid. More preferred.
  • the maintenance liquid according to the present embodiment is desirably a non-aqueous maintenance liquid that does not intentionally contain water.
  • a non-aqueous maintenance liquid is a maintenance liquid that does not intentionally contain water, except for water that is unavoidably contained due to moisture in the atmosphere and additives, etc., and that contains organic solvents. It is different from a water-based maintenance liquid made from water or a mixture of water and an organic solvent.
  • the water content in the maintenance liquid according to the present embodiment is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, and more preferably 1.0% by mass, based on the total amount of the maintenance liquid. % or less, and even more preferably 0.5 mass or less.
  • the maintenance liquid according to the present embodiment is suitable for an inkjet recording apparatus that performs recording using a non-aqueous ink composition. Then, when the maintenance liquid is used, solid matter may be generated due to components contained in the non-aqueous ink composition. By reducing the water content in the maintenance liquid so that it contains as little water as possible (intentionally avoiding water), the stability, etc. of the inkjet recording device is more effectively improved. becomes possible.
  • the maintenance liquid according to this embodiment may contain a coloring material.
  • the coloring material is not particularly limited, and may be a dye-based coloring material or a pigment-based coloring material, but a pigment is preferable from the viewpoint of deposition of the coloring material in the maintenance liquid.
  • Pigments that can be used in the maintenance liquid according to the present embodiment are not particularly limited, and examples thereof include organic pigments that are used in conventional ink compositions. These may be used individually by 1 type, or may be used in combination of 2 or more type. Note that the maintenance liquid according to the present embodiment does not have to contain a coloring material.
  • the dispersion stability of the pigment can be improved by using a dispersant or dispersion aid (pigment derivative), which will be described later.
  • pigment derivative pigment derivative
  • Specific organic pigments are the same as the specific organic pigments contained in the maintenance liquid of the first embodiment described above.
  • the color index (C.I.) numbers of specific organic pigments are also the same as those contained in the maintenance liquid of the first embodiment.
  • the content of the coloring material is not particularly limited, but the lower limit of the content of the coloring material is preferably in the range of 0.0005% by mass or more, and in the range of 0.001% by mass or more in the total amount of the maintenance liquid. is more preferable, and the range of 0.005% by mass or more is even more preferable.
  • the upper limit of the content of the coloring material is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, and 0.3% by mass or less in the total amount of the maintenance liquid. is more preferable. The same applies to the content of the coloring material contained in the maintenance liquid of the third embodiment, which will be described later.
  • the maintenance liquid according to the present embodiment does not contain a coloring material. Since it is possible to reduce the possibility that the coloring material contained in the maintenance liquid precipitates as a solid content, it is possible to improve the washability of the maintenance liquid. The same applies to the maintenance liquid of a third embodiment, which will be described later.
  • the maintenance liquid according to this embodiment may contain a dispersant.
  • a dispersant As a result, it is possible to effectively disperse the components derived from the ink composition, and it is possible to improve the washability of the maintenance liquid.
  • the specific dispersant is the same as the specific dispersant contained in the maintenance liquid of the first embodiment described above.
  • the preferred content of the dispersant is the same as the preferred content of the dispersant contained in the maintenance liquid of the first embodiment described above.
  • a dispersing aid may be used as necessary in the maintenance liquid according to the present embodiment.
  • the maintenance liquid is used for the purpose of suppressing volatilization and solidification of the maintenance liquid in the device such as the nozzle part and the inside of the tube, and also for the purpose of resolubility when it solidifies, and also to reduce the surface tension.
  • a surfactant may be added for the purpose of improving washing performance.
  • Specific surfactants are the same as the specific surfactants contained in the maintenance liquid of the first embodiment described above.
  • the surfactant is not limited to the above, and any anionic, cationic, amphoteric or nonionic surfactant can be used, and may be appropriately selected according to the purpose of addition.
  • the maintenance liquid according to the present embodiment includes light stabilizers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicon, etc.), Known additives such as antifoaming agents, pH adjusters, bactericides, preservatives, deodorants, charge control agents, wetting agents, pigments and extenders may be included as optional components.
  • light stabilizers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicon, etc.)
  • Known additives such as antifoaming agents, pH adjusters, bactericides, preservatives, deodorants, charge control agents, wetting agents, pigments and extenders may be included as optional components.
  • the maintenance liquid according to this embodiment is a maintenance liquid used in an inkjet recording apparatus having an inkjet head containing a cured resin as a constituent member.
  • Resin cured product means a cured product of a curable resin. It is not particularly limited as long as it is a cured product of a curable resin, and thermosetting resins such as epoxy resins, silicone resins, phenolic resins, melamine resins, urea resins, unsaturated polyester resins, alkyd resins, and polyurethane resins. and a photocurable resin containing an ethylenic double bond. Among these, it is preferable to contain at least an epoxy resin and/or a silicone resin.
  • the maintenance liquid according to the present embodiment contains an organic solvent, and this organic solvent is characterized by containing the following organic solvent A3.
  • Organic solvent A3 at least one selected from the group consisting of alkylamide solvents (a1), cyclic amide solvents (a2), and lactone solvents (a3)
  • a maintenance liquid containing such an organic solvent A3 is a maintenance liquid that is highly suitable for members with respect to cured resins and has excellent cleaning properties.
  • Organic solvent has the function of cleaning clogged ink channels.
  • This organic solvent contains organic solvent A3 (at least one selected from the group consisting of alkylamide solvent (a1), cyclic amide solvent (a2), and lactone solvent (a3)).
  • Organic solvent A3 is at least one selected from the group consisting of alkylamide solvents (a1), cyclic amide solvents (a2), and lactone solvents (a3). By containing the organic solvent A3, it is possible to improve the washability of the maintenance liquid.
  • R 1 is hydrogen or an alkyl group having 1 to 4 carbon atoms
  • R 2 R 3 each independently represents hydrogen or an alkyl group having 1 to 4 carbon atoms. show.
  • R 2 and R 3 in formula (3-1) are preferably alkyl groups having 1 to 4 carbon atoms, more preferably alkyl groups having 2 to 4 carbon atoms.
  • the component suitability for the cured resin material is also improved.
  • alkylamide solvents include N,N-diethylformamide, N,N-diethylacetamide, N,N-dipropylformamide, N,N-dibutylformamide, N,N-diethylpropanamide, N , N-dipropylpropanamide, N-ethylformamide, N-ethylacetamide and the like.
  • the content of the alkylamide solvent is not particularly limited, but the lower limit of the content of the alkylamide solvent is preferably in the range of 1% by mass or more, and in the range of 5% by mass or more in the total amount of the maintenance liquid. is more preferable, the range of 10% by mass or more is more preferable, and the range of 15% by mass or more is even more preferable.
  • the upper limit of the content of the alkylamide-based solvent is preferably 90% by mass or less, more preferably 80% by mass or less, and preferably 70% by mass or less in the total amount of the maintenance liquid. More preferred.
  • a cyclic amide-based solvent having, for example, the following structure can be preferably used.
  • R 4 is an alkylene group having 3 to 5 carbon atoms
  • R 5 represents hydrogen, an alkyl group having 1 to 4 carbon atoms, or an unsaturated hydrocarbon group.
  • Unsaturated hydrocarbon group means a hydrocarbon group containing at least one or more multiple bonds such as a vinyl group.
  • R 5 is preferably hydrogen, an alkyl group having 1 to 3 carbon atoms, or an unsaturated hydrocarbon group, and is preferably hydrogen, an alkyl group having 1 to 2 carbon atoms, or an unsaturated hydrocarbon group. preferable.
  • R 4 is preferably an alkylene group having 4 or more and 5 or less carbon atoms.
  • the component suitability for cured resins is also improved.
  • cyclic amide solvents include 3-methyl-2-oxazolidinone, 3-ethyl-2-oxazolidinone, N-vinylmethyloxazolidinone, N-methylcaprolactam, N-ethylcaprolactam, N-propylcaprolactam, N -acetylcaprolactam, ⁇ -caprolactam, N-vinylcaprolactam, 2-pyrrolidone, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-propyl-2-pyrrolidone and the like. Among them, it is preferable to contain at least one selected from the group consisting of ⁇ -caprolactam, N-methylcaprolactam, and N-vinylcaprolactam.
  • the content of the cyclic amide-based solvent is not particularly limited, but the lower limit of the content of the cyclic amide-based solvent is preferably in the range of 1% by mass or more, and in the range of 3% by mass or more in the total amount of the maintenance liquid. is more preferable, and the range of 10% by mass or more is even more preferable.
  • the upper limit of the content of the cyclic amide-based solvent is preferably 90% by mass or less, more preferably 60% by mass or less, further preferably 40% by mass or less, and 35% by mass in the total amount of the maintenance liquid. It is even more preferable that:
  • Lactone Solvent is a solvent having a cyclic ester structure. By containing the lactone-based solvent, the cleaning properties of the maintenance liquid can be improved.
  • lactone-based solvent for example, a lactone-based solvent having the following structure can be preferably used.
  • R 6 is an alkylene group having 3 to 5 carbon atoms
  • R 7 represents hydrogen or an alkyl group having 1 to 2 carbon atoms.
  • R 6 is preferably 4 or more and 5 or less, and more preferably 5.
  • a maintenance liquid containing such a lactone-based solvent has even better suitability for members with respect to cured resins.
  • lactone solvents examples include ⁇ -valerolactone, ⁇ -hexanolactone, ⁇ -caprolactone, ⁇ -valerolactone, ⁇ -hexalactone, ⁇ -heptalactone, ⁇ -octalactone, ⁇ -nonalactone, ⁇ - Examples include lactone solvents having a 6-membered ring or more, such as decalactone and ⁇ -undecalactone.
  • the content of the lactone-based solvent (a3) is not particularly limited, but the lower limit of the content of the lactone-based solvent is not particularly limited, but the lower limit of the content of the lactone-based solvent is 1% by mass or more of the total amount of the maintenance liquid. It is preferably in the range, more preferably in the range of 3% by mass or more, and even more preferably in the range of 10% by mass or more.
  • the upper limit of the content of the lactone-based solvent is preferably 90% by mass or less, more preferably 60% by mass or less, further preferably 40% by mass or less, and 35% by mass or less in the total amount of the maintenance liquid. is even more preferable.
  • the organic solvent contains at least one selected from the group consisting of alkylamide solvents (a1), cyclic amide solvents (a2), and lactone solvents (a3). It is characterized by Among them, it preferably contains at least one selected from the group consisting of the alkylamide solvent (a1) and the cyclic amide solvent (a2), and more preferably contains the alkylamide solvent (a1). .
  • the maintenance liquid according to the present embodiment exhibits the effects of the present invention particularly effectively, and is excellent in drying properties. If the maintenance liquid has excellent drying properties, it will be possible to quickly remove the maintenance liquid from the inkjet recording apparatus after washing, and it will be possible to quickly reuse the inkjet recording apparatus.
  • the lower limit of the content of the organic solvent A3 with respect to the total amount of the maintenance liquid is preferably in the range of 1% by mass or more, and in the range of 5% by mass or more. more preferably 10% by mass or more, and even more preferably 15% by mass or more.
  • the upper limit of the content of the organic solvent A3 is preferably 95% by mass or less, more preferably 90% by mass or less, and 85% by mass or less with respect to the total amount of the maintenance liquid. is more preferred.
  • the organic solvent may contain an organic solvent other than the above organic solvent A3.
  • organic solvent A3 ethylene glycol mono-n-butyl ether, ethylene glycol mono-isobutyl ether, ethylene glycol mono-t-butyl ether, ethylene glycol mono-2-ethylhexyl ether, diethylene glycol monomethyl (or ethyl, propyl, isopropyl, n-butyl , isobutyl, t-butyl, 2-ethylhexyl ether, triethylene glycol monomethyl (or ethyl, propyl, isopropyl, n-butyl, isobutyl, t-butyl, 2-ethylhexyl) ether, tetraethylene glycol monomethyl ether, propylene glycol mono- n-butyl ether, propylene glycol mono-isobutyl ether, propylene glycol mono-t-butyl
  • the content of the other organic solvent is not particularly limited, but the lower limit of the content of the other organic solvent is preferably in the range of 10% by mass or more, more preferably 20% by mass or more in the total amount of the maintenance liquid. is more preferable, and the range of 30% by mass or more is even more preferable.
  • the upper limit of the content of other organic solvents is preferably 90% by mass or less, more preferably 85% by mass or less, and preferably 80% by mass or less, based on the total amount of the maintenance liquid. More preferred.
  • the maintenance liquid according to the present embodiment preferably contains an organic solvent with a boiling point of 250°C or higher. Containing an organic solvent having a boiling point of 250° C. or higher makes it possible to reduce the content of volatile organic compounds in the maintenance liquid, thereby reducing environmental load. Furthermore, the moisturizing property of the maintenance liquid can be improved.
  • the lower limit of the content of the organic solvent having a boiling point of 250° C. or higher is preferably in the range of 5% by mass or more, more preferably 10% by mass or more, and more preferably 15% by mass or more in the total amount of the maintenance liquid. It is even more preferable to have The upper limit of the content of the organic solvent having a boiling point of 250° C.
  • Organic solvents having a boiling point of 250° C. or higher include triethylene glycol monobutyl ether (boiling point of 278° C.) and tetraethylene glycol monobutyl ether (boiling point of 304° C.).
  • the maintenance liquid according to this embodiment may contain a coloring material. By containing the coloring material, it is possible to suppress the corrosion of the member by the organic solvent contained in the maintenance liquid, thereby improving the suitability for the member.
  • the maintenance liquid according to the present embodiment contains the organic solvent A3, it has high suitability for members with respect to the cured resin and is excellent in washability. It is possible to further enhance the suitability of the member for
  • the coloring material is not particularly limited, and may be dye-based or pigment-based, but pigments are preferable from the viewpoint of dispersibility in the maintenance liquid.
  • Pigments that can be used in the maintenance liquid according to the present embodiment are not particularly limited, and examples thereof include organic pigments that are used in conventional ink compositions. These may be used individually by 1 type, or may be used in combination of 2 or more type. Note that the maintenance liquid according to the present embodiment does not have to contain a coloring material.
  • the dispersion stability of the pigment can be improved by using a dispersant or dispersion aid (pigment derivative), which will be described later.
  • pigment derivative pigment derivative
  • Specific organic pigments are the same as the specific organic pigments contained in the maintenance liquid of the first embodiment described above.
  • the color index (C.I.) numbers of specific organic pigments are also the same as those contained in the maintenance liquid of the first embodiment.
  • the preferred content of the coloring material is the same as the preferred content of the coloring material contained in the maintenance liquid of the second embodiment described above.
  • the maintenance liquid according to this embodiment may contain a dispersant.
  • a dispersant As a result, it is possible to effectively disperse the components derived from the ink composition, and it is possible to improve the washability of the maintenance liquid.
  • the maintenance liquid according to the present embodiment contains the organic solvent A3, the maintenance liquid has high suitability for members with respect to the cured resin and is excellent in cleaning properties. can be further enhanced.
  • the specific dispersant is the same as the specific dispersant contained in the maintenance liquid of the first embodiment described above.
  • the preferred content of the dispersant is the same as the preferred content of the dispersant contained in the maintenance liquid of the first embodiment described above.
  • a dispersing aid may be used as necessary in the maintenance liquid according to the present embodiment.
  • the maintenance liquid is used for the purpose of suppressing volatilization and solidification of the maintenance liquid in the device such as the nozzle part and the inside of the tube, and also for the purpose of resolubility when it solidifies, and also to reduce the surface tension.
  • a surfactant may be added for the purpose of improving washing performance.
  • Specific surfactants are the same as the specific surfactants contained in the maintenance liquid of the first embodiment described above.
  • the surfactant is not limited to the above, and any anionic, cationic, amphoteric or nonionic surfactant can be used, and may be appropriately selected according to the purpose of addition.
  • the maintenance liquid according to the present embodiment includes light stabilizers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicon, etc.), Known additives such as antifoaming agents, pH adjusters, bactericides, preservatives, deodorants, charge control agents, wetting agents, pigments and extenders may be included as optional components.
  • light stabilizers such as antioxidants and ultraviolet absorbers, epoxides and the like, polyvalent carboxylic acids, surface conditioners, slip agents, leveling agents (acrylic, silicon, etc.)
  • Known additives such as antifoaming agents, pH adjusters, bactericides, preservatives, deodorants, charge control agents, wetting agents, pigments and extenders may be included as optional components.
  • a maintenance method according to the present embodiment is a method of performing maintenance of an inkjet recording apparatus using the maintenance liquid described above. Since the maintenance liquid of the first embodiment described above has high suitability for members constituting an inkjet recording apparatus and is excellent in cleaning properties, a maintenance method of performing maintenance of an inkjet recording apparatus using this maintenance liquid. Also, there is little erosion of the members constituting the ink jet recording apparatus.
  • the maintenance liquid of the second embodiment described above has excellent moisturizing properties in the plastic container and the plastic supply body in the inkjet recording apparatus, maintenance of the inkjet recording apparatus using this maintenance liquid is possible. Also in this method, reprecipitation of components derived from the washed ink composition can be suppressed, so that effective washing becomes possible.
  • the maintenance liquid of the third embodiment has high member suitability for the cured resin material and is excellent in washability. In addition, it is possible to suppress erosion of the cured resin material constituting the inkjet head and remove components derived from the ink composition adhering to the inside of the ink flow path and the like.
  • the maintenance liquid of the second embodiment has excellent moisture retention properties in the plastic container and the plastic supply body in the inkjet recording apparatus. It is possible to suppress volatilization of the maintenance liquid within the plastic member.
  • the ink flow path of the inkjet recording apparatus includes an ink composition container for storing the ink composition, and a supply channel (a tube or the like) for supplying the ink composition from the ink composition container (ink cartridge, bottle, etc.) to the inkjet head. dampers, etc.), flow paths for circulating the ink composition to the nozzle openings in the inkjet head, and the like.
  • the maintenance method includes, for example, circulating the maintenance liquid through the ink flow path of the inkjet recording apparatus.
  • the ink composition is discharged from an inkjet recording apparatus filled with the ink composition, and then the maintenance liquid of the first, second, and third embodiments is circulated, and the ink composition.
  • the maintenance liquid of the first, second, and third embodiments is circulated from the upstream of the ink flow path without discharging the ink composition from the inkjet recording apparatus filled with the ink composition, and the ink composition is discharged.
  • the maintenance liquid is discharged from the inkjet recording apparatus filled with the maintenance liquid according to the above-described method and the above-described first, second, and third embodiments, and then the ink composition is circulated. Examples include a method in which the ink composition is circulated from the upstream of the ink flow path and the maintenance liquid is discharged without discharging the maintenance liquid from the apparatus.
  • the distribution and discharge of the maintenance liquid in the first, second, and third embodiments described above may be performed using a normal cleaning operation of the inkjet recording apparatus.
  • the maintenance method for the head cap, wiper, flushing area, platen, nozzle plate, ink mist attachment point in the housing, etc. of the inkjet recording apparatus is not particularly limited. , a method in which maintenance liquid is adhered and, if necessary, the maintenance liquid is wiped off.
  • a wiping member rubber-based or fiber-based
  • a wiper may be immersed in the maintenance liquid to wipe off members to which the ink composition adheres, such as the nozzle openings of the inkjet head.
  • a cap having a through-hole is placed over the nozzle opening of the inkjet head, and a suction pump communicating with the through-hole via a tube generates a negative pressure in the cap, and the maintenance liquid is supplied to the inkjet recording apparatus. may be circulated in the ink flow path.
  • Inkjet recording device Conventionally known inkjet recording apparatuses using the maintenance liquids of the first, second, and third embodiments can be used. These maintenance liquids may be used to remove components derived from the ink composition, and these maintenance liquids may be passed through the ink passages of the inkjet recording apparatus according to the present embodiment. These maintenance liquids may be inkjet-discharged by the inkjet recording apparatus according to the present embodiment, and the configuration of the inkjet recording apparatus according to the present embodiment is performed by a wiping member (for example, a wiper, etc.) impregnated with these maintenance liquids. A member (for example, a nozzle opening of an inkjet head, etc.) may be wiped off.
  • a wiping member for example, a wiper, etc.
  • the ink jet recording apparatus is equipped with a plastic container and/or a plastic supplier. Since the above-mentioned maintenance liquid has excellent moisture retention properties in the plastic container and the plastic supply body, it is possible to use the maintenance liquid in an ink jet recording apparatus having a plastic container and/or a plastic supply body, in which the inside of the plastic container and/or the plastic supply body is in contact with the maintenance liquid. Preferably.
  • the material of the plastic member constituting at least part of the plastic container and the plastic supply body is not particularly limited as long as it is a resin, and examples thereof include polyolefin resin, ethylene propylene diene rubber, nylon, polyurethane, PTFE, and the like. It is preferable to use polyethylene resins and ethylene propylene diene rubbers, and among these, it is particularly preferable to use low density polyethylene resins.
  • the maintenance liquid of the third embodiment has high member suitability for the cured resin material and is excellent in cleaning properties. By doing so, while suppressing erosion of the cured resin material that constitutes the inkjet head, ink mist inside the ink flow path, the head cap of the recording device, the wiper, the flushing area, the platen, the nozzle plate, and the inside of the housing. It becomes possible to remove the components derived from the adhered ink composition.
  • FIG. 1 A schematic diagram showing an example of an inkjet head is shown in FIG.
  • the inkjet head 1 discharges the maintenance liquid supplied from the ink cartridge (maintenance liquid supply section) from the ejection hole surface D. As shown in FIG.
  • the cured resin that constitutes the inkjet head is not particularly limited as long as it is a cured product of a curable resin.
  • thermosetting resins such as phenol-based resins, phenol-based resins, melamine-based resins, urea resins, unsaturated polyester resins, alkyd resins, polyurethane-based resins, and photo-curable resins containing ethylenically unsaturated double bonds.
  • the cured resin preferably contains at least an epoxy resin and/or a silicone resin. Epoxy-based resins and silicone-based resins have strong adhesive strength, and can firmly bond the constituent members of the inkjet head. An adhesive containing an epoxy resin that can be used as an adhesive for bonding components of an inkjet head will be described below.
  • the skeleton of the epoxy-based resin of the structural formula (3-4) includes conventional epoxy resins such as tetrabromobisphenol A, bisphenol F, bisphenol AD, and bisphenol Z. It may have a structure known as a main component of a resin adhesive.
  • the epoxy-based resin contained in the adhesive is not limited to the typical epoxy-based resins exemplified above, and any resin having an epoxy group in the side chain may be used.
  • curing agents such as amine-based curing agents, acid anhydride-based curing agents, and phenol-based curing agents together with epoxy-based resins, it is possible to polymerize epoxy-based resins and obtain cured products.
  • the proportion of the epoxy-based resin contained in the cured product of the adhesive may be 10% by mass or more of the total amount of the cured adhesive, and should be 30% by mass or more. , more preferably 50% by mass or more, still more preferably 70% by mass or more, still more preferably 90% by mass or more, and most preferably 99% by mass or more.
  • a silicon-based resin is a polymer having a main chain of repeating siloxane bonds and side groups such as alkyl and aryl groups, and is a siloxane-based condensate. Examples of silicon-based resins include "KE1831" manufactured by Shin-Etsu Chemical Co., Ltd.
  • the inkjet head that ejects the maintenance liquid and the ink composition may be a piezo inkjet head using piezoelectric elements or a thermal inkjet head using a heating element, and is not particularly limited.
  • the inkjet recording apparatus performs recording using a non-aqueous ink composition.
  • the maintenance liquid contains at least one amide-based solvent or lactone-based solvent, and can effectively remove components derived from the non-aqueous ink composition.
  • the non-aqueous ink composition means an ink composition containing an organic solvent produced without intentionally containing water, unlike an aqueous ink composition containing water as a main component.
  • the ink composition ejected by the above-described inkjet recording apparatus may be a conventionally known ink composition.
  • the ink composition ejected by an inkjet recording apparatus using the maintenance liquid is preferably a non-aqueous ink composition.
  • the maintenance liquid contains at least one amide solvent or lactone solvent, it is possible to effectively remove components derived from the non-based ink composition.
  • Ink compositions used for evaluation of maintenance liquids were produced by mixing each component in the proportions shown in Table 6 below. The unit is % by mass.
  • Moisture Absorption Test A moisture absorption test was performed on the maintenance liquids of Examples and Comparative Examples, and the water absorption amount after the test was measured. Specifically, a 1-liter bottle containing the maintenance liquid was placed in a constant temperature bath (temperature: 25°C, humidity: 55%), and the bottle was left open for 100 hours while gently stirring. It was placed and the moisture content after placement was measured. A Karl Fischer Moisture Meter 901 (manufactured by Metrohm Japan Co., Ltd.) was used to measure the moisture content.
  • Evaluation 4 All the solidified components were dissolved, and almost no solidified components remained. Evaluation 3: All of the solidified components were dissolved, but some of them were not dissolved. Evaluation 2: All the solidified components were dissolved, but most of the loose lumps were not dissolved. Evaluation 1: The solidified component did not dissolve.
  • the maintenance liquids of Examples and Comparative Examples were evaluated for cohesiveness. Specifically, 20 g of the produced ink composition and 20 g of the maintenance liquids of Examples and Comparative Examples were mixed to obtain a mixed liquid. Thereafter, the mixture was sealed in a container at room temperature of 25° C. and left for 5 days. After the mixture was sufficiently shaken after standing, 5 ml of the mixture was filtered through a filter with a pore size of 10 ⁇ m, and aggregates derived from the ink composition on the filter were observed (indicated as aggregation in the table). Evaluation Criteria Evaluation 5: No aggregates were observed. Evaluation 4: Although some aggregates were observed, the liquid was passed without any problem. Evaluation 3: Aggregates were observed, but liquid flowed without problems. Evaluation 2: A large amount of agglomerate was confirmed, and poor passage of liquid occurred. Evaluation 1: The entire amount of liquid could not be passed.
  • the maintenance liquids of Examples and Comparative Examples were evaluated for suitability for members (suitability for members of inkjet heads). Specifically, 0.2 g of an epoxy adhesive (two-liquid curing type epoxy adhesive "1500", manufactured by Cemedine Co., Ltd.) used for inkjet head members was dried at 60° C. for one day, After being immersed in the maintenance liquids of Examples and Comparative Examples and left at 60° C. for 1 week, an immersion test was performed to measure the change in weight of the cured product (referred to as “member suitability” in the table). Evaluation Criteria Evaluation 5: The weight change rate is less than 3%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 4 The weight change rate is 3% or more and less than 5%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 3 The weight change rate is 5% or more and less than 10%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 2 The weight change rate is 10% or more and less than 15%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 1 The weight change rate is 15% or more and/or the material of the epoxy adhesive is deteriorated.
  • the moisturizing properties of the maintenance liquids of Examples and Comparative Examples were evaluated. Specifically, using an inkjet recording apparatus (trade name: VersaArt RE-640, manufactured by Roland DG Co., Ltd.) equipped with a cleaning system, the manufactured ink composition is filled and a nozzle check pattern is printed. Then, it was confirmed that the ink composition was normally ejected from all nozzles. Thereafter, after the ink composition was discharged, the maintenance liquids of Examples and Comparative Examples were filled and left at room temperature of 25° C. and humidity of 60% for one month. After that, the maintenance liquid was discharged, the manufactured ink composition was refilled, and the cleaning operation was performed once.
  • an inkjet recording apparatus (trade name: VersaArt RE-640, manufactured by Roland DG Co., Ltd.) equipped with a cleaning system, the manufactured ink composition is filled and a nozzle check pattern is printed. Then, it was confirmed that the ink composition was normally ejected from all nozzles. Thereafter, after the ink composition was
  • the maintenance liquids of Examples and Comparative Examples were evaluated for cleaning properties after leaving. Specifically, using an inkjet recording apparatus (trade name: VersaArt RE-640, manufactured by Roland DG Co., Ltd.), the manufactured ink composition is filled, a nozzle check pattern is recorded, and all nozzles are It was confirmed that the ink composition was ejected normally. After that, the maintenance liquids of Examples and Comparative Examples which were filled in a 1 L bottle and opened, and the inkjet recording apparatus used for recording were left at room temperature of 25° C. and humidity of 60% for one month, and then cleaning operation was performed once.
  • an inkjet recording apparatus trade name: VersaArt RE-640, manufactured by Roland DG Co., Ltd.
  • the maintenance liquid of the embodiment in which the water content is controlled within a predetermined range and contains at least one amide-based solvent or lactone-based solvent, exhibits excellent cleaning performance and suitability for members. It was good. From this, it can be seen that the maintenance liquid of the present invention has high suitability for members constituting an inkjet recording apparatus and is excellent in cleanability.
  • the maintenance liquids of Examples 1-1 to 1-5 containing an amide-based solvent and changing the type of amide-based solvent were N,N-diethyl Since it contains at least one selected from the group consisting of formamide, N,N-diethylpropanamide and N,N-diethylacetamide, it has better suitability for members than the maintenance liquids of Examples 1-4 and 1-5. was good.
  • Examples 1-7 and 1- The maintenance liquid No. 8 was superior to the maintenance liquids of Examples 1-6 in member suitability and moisture retention.
  • Example 1-12 containing an organic solvent (triethylene glycol mono-n-butyl ether) having an enthalpy of vaporization (EOV) of 45 kJ/mol or more was compared with the maintenance liquid of Example 1-1. , the moisture retention was good.
  • organic solvent triethylene glycol mono-n-butyl ether
  • EOV enthalpy of vaporization
  • the maintenance liquids of Examples 1-9, 1-11 to 1-13, 1-18, 1-19, 1-22 to 1-25 containing an amide-based solvent and varying the content of the amide-based solvent containing an amide-based solvent and varying the content of the amide-based solvent
  • the maintenance liquids of Examples 1-11 to 1-13, 1-18, 1-19, and 1-22 to 1-25, in which the content of the amide solvent is in the range of 7% by mass or more are It was good.
  • the maintenance liquids of Examples 1-9, 1-11 to 1-13, 1-18, 1-19, and 1-22, in which the content of the amide-based solvent is in the range of 70% by mass or less have poor member suitability. It was good.
  • Examples 1-31 to 1-39 containing an amide solvent and a glycol ether solvent examples 1-31 to 1-31 containing an organic solvent having an enthalpy of vaporization (EOV) of 45 kJ/mol or more.
  • the maintenance liquids of -33, 1-36, 1-37 and 1-39 had good moisturizing properties.
  • the maintenance liquid of Comparative Example 1-1 which contained more than 5% by mass of the total amount of the maintenance liquid, and the maintenance liquids of Comparative Examples 1-2 and 1-3, which did not contain an amide-based solvent or a lactone-based solvent, , detergency deteriorated. Furthermore, the maintenance liquid of Comparative Examples 1-3, which consisted only of glycol ether dialkyl, had poor suitability for members.
  • Non-aqueous maintenance liquids Production of Maintenance Liquid Maintenance liquids (non-aqueous maintenance liquids) of Examples and Comparative Examples were produced by mixing each component in the proportions shown in the table below. The unit is % by mass.
  • the non-aqueous maintenance liquid means a maintenance liquid that does not intentionally contain water and does not substantially contain water.
  • washability Detergency (solubility) was evaluated for the maintenance liquids of Examples and Comparative Examples. Specifically, 0.5 g of the produced ink composition was placed in a glass petri dish, placed in an oven at 60° C. and heated for 2 hours to dry the ink composition and precipitate components derived from the ink composition. Then, it was allowed to cool to 25° C., and 1.0 g of the maintenance liquids of Examples and Comparative Examples were dropped onto the solidified components derived from the ink compositions, and the solubility (washability) thereof was visually evaluated (in the table). , detergency). Evaluation Criteria Evaluation 5: All the solidified components were dissolved, and no solidified components remained.
  • Evaluation 4 All the solidified components were unraveled, and almost no solidified components remained. Evaluation 3: All of the solidified components were dissolved, but some of them were not dissolved. Evaluation 2: All the solidified components were unraveled, but most of the unraveled lumps were not dissolved. Evaluation 1: The solidified component was not unraveled.
  • the maintenance liquid was discharged, and the printer was left in a non-humidified constant temperature room at 40° C. for 5 days, then taken out to a 20° C. environment and allowed to cool for 1 day.
  • genuine magenta ink was filled by the ink replacement operation of the printer, solid printing was performed on the recording medium at a density of 100%, and recorded matter 2 was obtained.
  • X-Rite eXact manufactured by X-Rite Co., Ltd.
  • the colors of recorded matter 1 and 2 were measured under the conditions of a viewing angle of 2°, a measurement range of 4 mm ⁇ , and a D65 light source.
  • the maintenance liquids of Examples and Comparative Examples were evaluated for suitability for members (suitability for members of inkjet heads). Specifically, 0.2 g of an epoxy adhesive (two-liquid curing type epoxy adhesive "1500", manufactured by Cemedine Co., Ltd.) used for inkjet head members was dried at 60° C. for one day, After being immersed in the maintenance liquids of Examples and Comparative Examples and left at 60° C. for 1 week, an immersion test was performed to measure the change in weight of the cured product (referred to as “member suitability” in the table). Evaluation Criteria Evaluation 5: The weight change rate is less than 3%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 4 The weight change rate is 3% or more and less than 5%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 3 The weight change rate is 5% or more and less than 10%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 2 The weight change rate is 10% or more and less than 15%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 1 Weight change rate is 15% or more and/or there is deterioration of the material of the epoxy adhesive
  • MFDG in the table means "dipropylene glycol monomethyl ether”.
  • MFTG in the table means "tripropylene glycol monomethyl ether”.
  • PC in the table means "propylene carbonate”.
  • ECL in the table means " ⁇ -caprolactone”.
  • DEDG in the table means "diethylene glycol diethyl ether”.
  • DMFDG in the table means "dipropylene glycol dimethyl ether”.
  • BCG in the table means "triethylene glycol mono-n-butyl ether”.
  • EmMEA in the table means "ethylene glycol monomethyl ether acetate”.
  • EmBEA in the table means "ethylene glycol monobutyl ether acetate”.
  • PmMEA in the table means "propylene glycol monomethyl ether acetate”.
  • the maintenance liquid of the example containing an organic solvent having a volatilization rate of less than a predetermined value in the storage test is excellent in moisture retention in the plastic container and the plastic supply body in the inkjet recording apparatus. I understand.
  • the maintenance liquids of Examples 2-2 to 2-8 in which the content of the organic solvent A2 is in the range of 1% by mass or more and 95% by mass or less in the total amount of the maintenance liquid, furthermore It turns out that it is excellent in the moisture retention property of.
  • Example 2-5 containing an alkylamide solvent represented by formula (2-2) , 2-14 are not only excellent in moisturizing properties in the plastic container and the plastic feeder, but also excellent in cleaning properties and suitability for members.
  • Examples 2-36 to 2-41 containing a coloring material had high member suitability for resin cured products, like Example 2-5.
  • Examples 2-35 to 2-41 containing a dispersant were excellent in detergency like Example 2-5.
  • Non-aqueous maintenance liquids and aqueous maintenance liquids of Examples and Comparative Examples were produced by mixing each component in the proportions shown in the table below. The unit is % by mass.
  • the non-aqueous maintenance liquid means a maintenance liquid that does not intentionally contain water and does not substantially contain water
  • the aqueous maintenance liquid means a maintenance liquid that contains water. means.
  • Ink compositions used for evaluation of the maintenance liquid were produced by mixing each component in the proportions shown in Table 6 above and Table 19 below. The unit is % by mass.
  • non-aqueous ink composition means an ink composition that does not intentionally contain water and does not substantially contain water
  • aqueous ink composition means an ink composition that contains water.
  • a water-based ink composition was prepared using a coloring material (pigment dispersion), a resin (resin emulsion), a solvent, and water (ion-exchanged water) in the proportions shown in the table below.
  • a coloring material pigment dispersion
  • a resin resin emulsion
  • solvent solvent
  • water ion-exchanged water
  • a mixture with 3.6 g of ethylhexanoate was added dropwise over 1.5 hours. After completion of the dropwise addition, the mixture was allowed to react at 100° C. for 2 hours and then cooled to obtain a resin solution.
  • the resin was purified from the resin solution with hexane to obtain a pigment dispersion resin having a polymer average molecular weight (polystyrene equivalent) of 20000 and an acid value of 143 mgKOH/g.
  • a reactive surfactant manufactured by Kao Corporation, trade name: Latemul 3 g of PD-104
  • 0.01 g of potassium persulfate and 200 g of pure water were stirred and mixed at 70°C.
  • the prepared pre-emulsion was dropped into the flask over 3 hours. After further heating and aging at 70° C.
  • the volume average particle size (D50) of the resin emulsion was measured at 25° C. using a particle size distribution analyzer (NANOTRACWAVE particle size analyzer manufactured by Microtrack Bell Co., Ltd.).
  • washability Detergency (solubility) was evaluated for the maintenance liquids of Examples and Comparative Examples. Specifically, 0.5 g of the produced ink composition was placed in a glass petri dish, placed in an oven at 60° C. and heated for 2 hours to dry the ink composition and precipitate components derived from the ink composition. Then, it was allowed to cool to 25° C., and 1.0 g of the maintenance liquids of Examples and Comparative Examples were dropped onto the solidified components derived from the ink compositions, and the solubility (washability) thereof was visually evaluated (in the table). , detergency). Evaluation Criteria Evaluation 5: All the solidified components were dissolved, and no solidified components remained.
  • Evaluation 4 All the solidified components were unraveled, and almost no solidified components remained. Evaluation 3: All of the solidified components were dissolved, but some of them were not dissolved. Evaluation 2: All the solidified components were unraveled, but most of the unraveled lumps were not dissolved. Evaluation 1: The solidified component was not unraveled.
  • the drying properties of the maintenance liquids of Examples and Comparative Examples were evaluated. Specifically, an inkjet recording apparatus was filled with genuine magenta ink, and solid printing was performed on a recording medium (polyvinyl chloride film with glue (IMAGin JT5829R: manufactured by MACtac)) at 100% density to obtain recorded matter 1. . After that, the genuine ink was discharged and the maintenance liquids of Examples and Comparative Examples were filled by the ink replacement operation of the printer. Furthermore, the maintenance liquid was discharged, and the maintenance liquid was filled again. That is, the ink replacement operation was performed twice. In this state, the maintenance liquid was discharged, and the printer was left in a non-humidified constant temperature room at 40° C.
  • a recording medium polyvinyl chloride film with glue (IMAGin JT5829R: manufactured by MACtac)
  • Example suitability 1 The maintenance liquids of Examples and Comparative Examples were evaluated for suitability for members (suitability for members of inkjet heads). Specifically, 0.2 g of an epoxy adhesive (two-liquid curing type epoxy adhesive "1500", manufactured by Cemedine Co., Ltd.) used for inkjet head members was dried at 60° C. for one day, After being immersed in the maintenance liquids of Examples and Comparative Examples and left at 60° C. for 1 week, an immersion test was performed to measure the change in weight of the cured product (denoted as “Member suitability 1” in the table). Evaluation Criteria Evaluation 5: The weight change rate is less than 3%, and there is no deterioration of the material of the epoxy adhesive.
  • an epoxy adhesive two-liquid curing type epoxy adhesive "1500", manufactured by Cemedine Co., Ltd.
  • Evaluation 4 The weight change rate is 3% or more and less than 5%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 3 The weight change rate is 5% or more and less than 10%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 2 The weight change rate is 10% or more and less than 15%, and there is no deterioration of the material of the epoxy adhesive.
  • Evaluation 1 The weight change rate is 15% or more and/or the material of the epoxy adhesive is deteriorated.
  • Component suitability 2 The maintenance liquids of Examples and Comparative Examples were evaluated for suitability for members (suitability for members of inkjet heads). Specifically, 0.2 g of a cured product obtained by drying a silicon-based resin (one-liquid type liquid rubber “KE1831”, manufactured by Shin-Etsu Chemical Co., Ltd.) used for inkjet head members at 120° C. for 10 minutes was It was immersed in the maintenance liquid of the comparative example and allowed to stand at 60° C. for 1 week to conduct an immersion test, and the weight change of the cured product was measured (denoted as “member suitability 2” in the table). Evaluation Criteria Evaluation 5: The rate of change in weight is less than 5%, and there is no deterioration of the silicone-based resin material.
  • Evaluation 4 The weight change rate is 5% or more and less than 10%, and there is no deterioration of the silicone-based resin material.
  • Evaluation 3 The weight change rate is 10% or more and less than 15%, and there is no deterioration of the silicone-based resin material.
  • Evaluation 2 The weight change rate is 15% or more and less than 20%, and there is no deterioration of the silicone-based resin material.
  • Evaluation 1 There is a weight change rate of 20% or more and/or deterioration of the silicon-based resin material.
  • NMC in the table means "N-methylcaprolactam”.
  • NVC in the table means "N-vinylcaprolactam”.
  • DMI in the table means "1,3-dimethylimidazolidinone".
  • ECL in the table means " ⁇ -caprolactone”.
  • DEDG in the table means "diethylene glycol diethyl ether”.
  • DMFDG in the table means "dipropylene glycol dimethyl ether”.
  • BCG in the table means "triethylene glycol mono-n-butyl ether”.
  • MFTG in the table means "tripropylene glycol monomethyl ether”.
  • MFDG in the table means "dipropylene glycol monomethyl ether”.
  • PC in the table means "propylene carbonate”.
  • the maintenance liquid of the example containing the organic solvent A3 has high suitability for members with respect to the cured resin and is excellent in washability.
  • Examples 3-1 to 3-6 in which the content of the alkylamide solvent was changed, Examples 3-2 to 3-6 in which the content of the alkylamide solvent was in the range of 5% by mass or more It can be seen that the maintenance liquid of is more excellent in cleanability. Further, it can be seen that the maintenance liquids of Examples 3-1 to 3-5, in which the content of the alkylamide-based solvent is in the range of 90% by mass or less in the total amount of the maintenance liquid, have higher member suitability for the cured resin material.
  • Examples 3-44 to 3-47 containing a coloring material had high member suitability for resin cured products, like Example 3-5.
  • Examples 3-42 to 3-47 containing a dispersant were excellent in detergency like Example 3-5.
  • Examples 4-1 to 4-14 containing water similarly, it is found that the member aptitude for the cured resin is high and the washability is excellent.
  • Examples 4-7 to 4-11 containing a cyclic amide-based solvent or a lactone-based solvent the cyclic Example 4-7 containing an amide solvent and Example 4-10 containing a lactone solvent represented by the formula (3-3) and R 6 being an alkylene group having 4 to 5 carbon atoms
  • the member aptitude for the cured resin was higher, and the washability was superior.

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