Image forming method and image forming apparatus
阅读说明：本技术 图像形成方法及图像形成装置 (Image forming method and image forming apparatus ) 是由 梶优辉 中川智裕 萩原弘规 于 2019-06-24 设计创作，主要内容包括：本发明涉及图像形成方法以及图像形成装置。本发明提供对于非吸收性记录介质能得到一方面抑制渗透、确保高的发色性一方面耐结块性优异的图像的图像形成方法。本发明的图像形成方法的特征在于,包括:将包含金属盐及树脂A的前处理液涂布在记录介质的工序,以及将品红色墨水赋予已涂布上述前处理液的记录介质的工序,上述品红色墨水是包含C.I.颜料红269以及树脂B的品红色墨水,上述树脂B是具有比上述树脂A高的玻化温度的树脂,上述记录介质是非吸收性记录介质。(The invention relates to an image forming method and an image forming apparatus. The invention provides an image forming method capable of obtaining an image with excellent blocking resistance while inhibiting penetration and ensuring high color development for a non-absorptive recording medium. The image forming method of the present invention is characterized by comprising a step of applying a pretreatment liquid containing a metal salt and a resin A to a recording medium, and a step of applying a magenta ink to the recording medium to which the pretreatment liquid has been applied, wherein the magenta ink is a magenta ink containing C.I. pigment red 269 and a resin B, the resin B is a resin having a higher glass transition temperature than the resin A, and the recording medium is a non-absorptive recording medium.)
1. An image forming method comprising:
applying a pretreatment liquid containing a metal salt and a resin A to a recording medium; and
a step of applying magenta ink to the recording medium coated with the pretreatment liquid;
the image forming method is characterized in that:
the above magenta ink is a magenta ink containing c.i. pigment red 269 represented by the following structural formula (1) and a resin B;
structural formula (1):
the resin B is a resin having a higher glass transition temperature than the resin A;
the recording medium is a non-absorptive recording medium.
2. The image forming method according to claim 1, wherein the metal salt contained in the pretreatment liquid is a polyvalent metal salt.
3. The image forming method according to claim 2, characterized in that:
the polyvalent metal salt is calcium salt or magnesium salt.
4. The image forming method according to any one of claims 1 to 3, wherein a glass transition temperature of the resin A contained in the pretreatment liquid is 0 ℃ or lower.
5. The image forming method according to any one of claims 1 to 4, wherein a content of the C.I. pigment Red 269 with respect to the entire magenta ink is 6% by mass or less.
6. The image forming method according to any one of claims 1 to 5, wherein a glass transition temperature of the resin B contained in the magenta ink is 50 ℃ or higher.
7. An image forming apparatus includes:
a mechanism for applying a pretreatment liquid containing a metal salt and a resin A to a recording medium; and
a mechanism for applying magenta ink to the recording medium coated with the pretreatment liquid by using an ink jet head;
the image forming apparatus is characterized in that:
the above magenta ink is a magenta ink containing c.i. pigment red 269 represented by the following structural formula (1) and a resin B;
structural formula (1):
the resin B is a resin having a higher glass transition temperature than the resin A;
the recording medium is a non-absorptive recording medium.
8. The image forming apparatus as claimed in claim 7, wherein:
the ink jet head is a head having nozzles for ejecting ink;
the ink jet head includes:
individual liquid chambers communicating with the nozzles;
a common liquid chamber for supplying ink to the individual liquid chambers;
a circulation flow path communicating with the individual liquid chamber;
a circulation common liquid chamber communicating with the circulation flow path; and
and a pressure generating mechanism for applying pressure to the ink in the individual liquid chamber.
Technical Field
The invention relates to an image forming method and an image forming apparatus.
Background
Plastic films and the like are often used as packaging materials for foods, beverages, daily necessities and the like, and printing is generally applied to the packaging materials. Since the plastic film is a non-absorbent recording medium having very low water absorption, for example, solvent-based inks using an organic solvent as a solvent, ultraviolet-curable inks containing a polymerizable monomer as a main component, and the like are widely used as inks used for such a non-absorbent recording medium.
However, since foods, beverages, and daily necessities are directly in contact with or ingested by the human body, it is sometimes preferable not to use the solvent-based ink or the ultraviolet-curable ink by printing these packaging materials.
On the contrary, the aqueous ink containing water as a main component has less influence on the human body than the solvent-based ink or the ultraviolet-curable ink. As a method of printing without allowing the aqueous ink to penetrate into a non-absorbent recording medium having very poor water absorption, there is a method of printing after applying a pretreatment liquid containing a metal salt in advance to a non-absorbent recording medium. By applying the pretreatment liquid, a salt is formed from the metal ion and the coloring material, and the salt is formed to cause aggregation, whereby a high-quality image free from bleeding can be obtained. For example,
In addition, a plastic film as a non-absorbent recording medium generally has transparency, and it is necessary to increase the color material density in ink in order to ensure color developability. However, if the color material density is increased, the hardness and brittleness of the ink coating film increase, and when the roll is wound up in the final step of the industrial printing apparatus, the image and the adjacent film are bonded by the pressure of the roll, and the peeling blocking is likely to occur. Therefore, it is a problem to secure high color-developing property at a low color material density.
On the other hand, among color materials used for magenta ink, as a pigment having a low concentration and high color developability, there is c.i. pigment red 269, which is an azo pigment.
However, in the technique disclosed in
[ patent document ]
[ patent document 1 ] Japanese patent application laid-open No. 2010-23266
[ patent document 2 ] Japanese patent laid-open No. 2012 and 184334
Disclosure of Invention
Accordingly, an object of the present invention is to provide an image forming method capable of obtaining an image excellent in blocking resistance while suppressing bleeding and securing high color developability with respect to a non-absorbent recording medium.
The above problems are solved by the following means 1:
an image forming method comprising:
applying a pretreatment liquid containing a metal salt and a resin A to a recording medium; and
a step of applying magenta ink to the recording medium coated with the pretreatment liquid;
the image forming method is characterized in that:
the above magenta ink is a magenta ink containing c.i. pigment red 269 represented by the following structural formula (1) and a resin B;
the resin B is a resin having a higher glass transition temperature than the resin A;
the recording medium is a non-absorptive recording medium.
Structural formula (1):
the effects of the present invention are explained below:
according to the present invention, there is provided an image forming method capable of obtaining an image excellent in blocking resistance while suppressing bleeding and securing high color developability with respect to a non-absorbent recording medium.
Drawings
Fig. 1 is a perspective view illustrating an example of an ink jet recording apparatus.
Fig. 2 is a perspective view illustrating an example of a main tank in the ink jet recording apparatus.
Fig. 3 is an external perspective view showing an example of an ink jet head in the printing apparatus.
Fig. 4 is a cross-sectional explanatory view in a direction orthogonal to the nozzle arrangement direction of the inkjet head of fig. 3.
Fig. 5 is a partial cross-sectional explanatory view in a direction parallel to the nozzle arrangement direction of the ink jet head of fig. 3.
Fig. 6 is a plan explanatory view of a nozzle plate of the inkjet head of fig. 3.
Fig. 7a to 7f are plan explanatory views of respective members constituting a flow path member of the ink jet head of fig. 3.
Fig. 8a and 8b are plan explanatory views of respective members constituting the common liquid chamber member of the inkjet head of fig. 3.
Fig. 9 is a block diagram showing an example of an ink circulation system according to the present invention.
Fig. 10 is an explanatory view of ink circulation in the ink jet head.
Fig. 11 is an explanatory view of ink circulation in the ink jet head.
Fig. 12 shows an example of a recording apparatus of a type in which an ink jet recording head scans and forms an image.
FIG. 13 shows an example of a pretreatment liquid apparatus.
Detailed Description
The following describes embodiments of the present invention in further detail.
The image forming method of the present invention includes:
applying a pretreatment liquid containing a metal salt and a resin A to a recording medium; and
a step of applying magenta ink to the recording medium coated with the pretreatment liquid;
the image forming method is characterized in that:
the above magenta ink is a magenta ink containing c.i. pigment Red 269(c.i. pigment Red 269) represented by the following structural formula (1) and a resin B;
the resin B is a resin having a higher glass transition temperature than the resin A;
the recording medium is a non-absorptive recording medium.
Structural formula (1):
when a large-capacity printed matter is wound up and stored in a roll form, an image is brought into contact with an adjacent film in a pressurized state, and when the film is pulled out, if there is a bonding portion in the image, peeling blocking occurs. When the color material concentration is increased in order to obtain high color developability, the weight of pigment particles contained per unit volume in the ink coating film increases, and a hard and brittle layer is easily formed, and therefore, blocking is easily caused.
In the present invention, it is found that, by using c.i. pigment red 269 as an azo pigment as a color material of magenta ink, high color developability can be ensured even at a low pigment concentration, and the ink coating film is improved in hard brittleness and blocking resistance due to a high pigment concentration. Further, it was found that the blocking resistance can be further improved by including two kinds of resins having higher glass transition temperatures than the glass transition temperature of the resin a in the pretreatment liquid and the resin B in the magenta ink in the pretreatment liquid, respectively, in the pretreatment liquid and the magenta ink. This is considered to be because (1) by adding a resin having a low glass transition temperature to the pretreatment liquid, a relatively flexible pretreatment layer is formed, and a cushioning effect is exerted on the ink layer formed thereon, and (2) by adding a resin having a high glass transition temperature to the magenta ink, the entire ink layer becomes a uniform resin film having a high strength, and a defect in the ink layer is hardly generated. The combination of the above two actions (1) and (2) improves the blocking resistance.
< pretreatment solution >
The pretreatment liquid in the present invention contains at least a metal salt and a resin a, and may further contain water. And may contain an organic solvent, a surfactant, a defoaming agent, an antiseptic and antifungal agent, a rust preventive agent, and the like, which are contained in the magenta ink, as described below, as necessary.
The step of applying the pretreatment liquid to the recording medium is not particularly limited, and any known method can be used. For example, there are exemplified an ink jet method, a blade coating method, a gravure offset coating method, a bar coating method, a roll coating method, a blade coating method, an air knife coating method, a comma coating method, a U comma coating method, an AKKU coating method, a smooth coating method, a micro-gravure coating method, a reverse roll coating method, a four-roll coating method, a five-roll coating method, a dip coating method, a curtain coating method, a slide coating method, a die coating method and the like.
The amount of the pretreatment liquid applied to the recording medium is, for example, 0.1 to 10g/m2Preferably 1g to 6g/m2。
< Metal salt >
The metal salt contained in the pretreatment liquid causes the coloring material in the ink to aggregate rapidly after the ejection, thereby suppressing color leakage and improving color developability.
The metal salt is not particularly limited, and a polyvalent metal salt is preferable in order to obtain a permeation-inhibiting effect by more powerful aggregation of the coloring material.
Examples of the metal in the polyvalent metal salt include titanium, chromium, copper, cobalt, strontium, barium, iron, aluminum, calcium, magnesium, and the like. Among them, calcium and magnesium are preferable from the viewpoint of effective aggregation of the coloring material.
Specific examples of the polyvalent metal salt include calcium carbonate, calcium nitrate, calcium chloride, calcium acetate, calcium sulfate, magnesium chloride, magnesium acetate, magnesium sulfate, barium sulfate, zinc sulfide, zinc carbonate, aluminum silicate, calcium silicate, magnesium silicate, and aluminum hydroxide.
The concentration of the metal salt in the pretreatment liquid is, for example, 0.01 to 0.1 mol/kg, preferably 0.05 to 0.5 mol/kg, based on the total amount of the pretreatment liquid.
< resin A >
The resin a contained in the pretreatment liquid is preferably nonionic resin particles. The nonionic resin particles are resin particles that can be dispersed by steric repulsion even without using electric charges by neutralization of acidic or basic functional groups.
The structure of the nonionic resin particles is not particularly limited, and any nonionic dispersible resin particles can be used, and when at least one selected from a polyolefin resin, a polyvinyl acetate resin, a polyvinyl chloride resin, a polyurethane resin, and a copolymer thereof is used, the resin is preferably one that can obtain strong adhesion to various recording media, and more preferably an ethylene-vinyl acetate copolymer resin, an ethylene-vinyl acetate-vinyl chloride copolymer resin, a polyolefin-modified polyurethane resin, a polyester-based polyurethane resin, a polycarbonate-based polyurethane resin, and a polyether-based polyurethane resin.
The glass transition temperature of the resin A is preferably-30 ℃. When the glass transition temperature is-30 ℃ or higher, the resin film becomes sufficiently tough, the pretreatment layer formed on the recording medium from the pretreatment liquid is more firm, and when the glass transition temperature is 30 ℃ or lower, the film forming property can be improved and sufficient flexibility can be secured, so that the adhesiveness to the recording medium is strong and suitable. In the present invention, in order to form a pretreatment layer having higher flexibility, the glass transition temperature is preferably 0 ℃ or lower, more preferably-30 ℃ or higher and 0 ℃ or lower.
The glass transition temperature as described herein can be measured at a temperature of 30 to 300 ℃ at a temperature rise rate of 2.5 ℃ per minute using, for example, a Differential Scanning Calorimetry (DSC) apparatus (apparatus name: Thermo plus EV02/DSC, manufactured by RIGAKU Co., Ltd.).
The volume average particle diameter of the resin A (hereinafter, may be simply referred to as the average particle diameter) is preferably 1000nm or less, more preferably 10nm or more and 200nm or less. The volume average particle diameter can be measured using, for example, a particle diameter measuring instrument (Maruchisizer III, manufactured by Beckman Coulter) using analytical software (Beckman Coulter Mullisizer 3Version 3.51).
The content of the resin a in the pretreatment liquid as a solid content is preferably 0.5 mass% or more and 20 mass% or less, and more preferably 1 mass% or more and 15 mass% or less.
The content of the resin a is 0.5% by mass or more, and the resin a can sufficiently coat the surface of the recording medium, so that the adhesion of the pretreatment liquid is improved, and when the content is 20% by mass or less, the increase in thickness of the pretreatment liquid film is suppressed, and there is no fear of the adhesion being lowered.
< magenta ink >
The ink of the present invention may contain c.i. pigment Red 269 represented by the above structural formula (1), a resin B having a higher glass transition temperature than the above resin a, and water. If necessary, an organic solvent, a surfactant, a defoaming agent, an antiseptic and antifungal agent, a rust preventive agent, and the like may be contained.
< water >)
The content of water in the ink is not particularly limited and may be appropriately selected according to the purpose, but is preferably 10 mass% or more and 90 mass% or less, more preferably 20 mass% or more and 60 mass% or less, from the viewpoint of the drying property and the discharge reliability of the ink.
＜C.I.Pigment Red 269＞
The content of c.i.pigment Red 269 in the ink is preferably 0.1 mass% or more and 10 mass% or less, more preferably 1 mass% or more and 6 mass% or less, from the viewpoints of improvement in image density, good fixing property and discharge stability, and hard brittleness of the ink coating film. Hereinafter, c.i. pigment Red 269 may be simply referred to as "pigment".
In order to disperse the pigment to obtain the ink, there are a method of introducing a hydrophilic functional group into the pigment as a self-dispersible pigment, a method of coating the surface of the pigment with a resin to disperse the pigment, a method of dispersing the pigment using a dispersant, and the like.
As a method for introducing a hydrophilic functional group into a pigment as a self-dispersible pigment, for example, a method of adding a functional group such as a sulfo group or a carboxyl group to a pigment (for example, carbon) so as to be dispersible in water can be cited.
As a method of coating the surface of the pigment with a resin to disperse the pigment, for example, a method of including the pigment in microcapsules to disperse the pigment in water can be mentioned. This may be referred to as a resin-coated pigment. In this case, the pigment to be blended in the ink is not necessarily coated with the resin in its entirety, and the uncoated pigment or the pigment partially coated may be dispersed in water within a range not to impair the effect of the present invention.
Examples of the method of dispersing the particles using a dispersant include a method of dispersing the particles using a known low-molecular dispersant such as a surfactant and a method of dispersing the particles using a high-molecular dispersant.
As the dispersant, for example, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, a nonionic surfactant, and the like can be used depending on the pigment.
RT-100 (nonionic surfactant) manufactured by bamboo fat and oil Co., Ltd., and a naphthalenesulfonic acid formaldehyde condensate can be suitably used as the dispersant.
The dispersing agents may be used alone or in combination of two or more.
< pigment Dispersion >
The ink can be obtained by mixing materials such as water and an organic solvent into the pigment. Further, an ink may be produced by mixing a pigment with other water, a dispersant, and the like to obtain a pigment dispersion, and then mixing a material such as water and an organic solvent with the pigment dispersion.
The pigment dispersion can be adjusted in particle size by mixing and dispersing water, a pigment dispersant, and other components as needed. The dispersion may be carried out using a disperser.
The particle size of the pigment in the pigment dispersion is not particularly limited, and the maximum frequency in terms of the maximum number is preferably 20nm or more and 500nm or less, and more preferably 20nm or more and 150nm or less, from the viewpoint of satisfactory dispersion stability of the pigment, and high image quality such as discharge stability and image density. The particle size of the pigment can be measured using a particle size analyzer (NANORACK Wave-UT151, Microtrac BEL Co., Ltd.).
The content of the pigment in the pigment dispersion is not particularly limited, and may be appropriately selected according to the purpose, and is preferably 0.1 mass% or more and 50 mass% or less, and more preferably 0.1 mass% or more and 30 mass% or less, from the viewpoint of obtaining good discharge stability and improving image density.
The pigment dispersion is preferably subjected to degassing by filtering coarse particles with a filter or a centrifugal separator, if necessary.
< resin B >
The resin B contained in the magenta ink is not particularly limited as long as it has a higher glass transition temperature than the resin a, and propylene-based resin pellets are preferable. The propylene-based resin particles have an effect of improving chroma and suppressing bleeding because they affect the smoothness and transparency of the film. In addition, the strength of the ink coating film is improved. Examples of the propylene resin particles include propylene resins, ethylene-propylene resins, and crosslinked ethylene-propylene resins.
The glass transition temperature of the resin B needs to be higher than that of the resin a, and from the viewpoint of improving the effect of the present invention, it is preferably 50 ℃ or higher, and more preferably 50 ℃ or higher and 100 ℃ or lower, from the viewpoint of improving the ink film strength in the room-temperature storage of the printed matter. The difference between the glass transition temperature of the resin A and the glass transition temperature of the resin B is preferably 10 ℃ or higher and 100 ℃ or lower, and more preferably 50 ℃ or higher and 100 ℃ or lower.
The volume average particle diameter of the resin B is preferably 1000nm or less, more preferably 10nm or more and 200nm or less. The volume average particle diameter can be measured using, for example, a particle diameter measuring instrument (Maruchisizer III, manufactured by Beckman Coulter) using analytical software (Beckman Coulter Mullisizer 3Version 3.51).
The resin B may be suitably synthesized or commercially available.
Examples of commercially available products of the resin B include MICRO GEL E-1002, E-5002 (ethylene-propylene resin pellets, manufactured by PAINT Japan), BONCOAT 4001 (propylene resin pellets, manufactured by JAPONI INK CHEMICAL INDUSTRIES), BONCOAT 5454 (ethylene-propylene resin pellets, manufactured by JAPONI INK CHEMICAL INDUSTRIES), SAE-1014 (ethylene-propylene resin pellets, manufactured by ZEON Japan), SYBINOL SK-200 (propylene resin pellets, manufactured by SAIDEN CHEMICAL INDUSTRIES), PRL AC-22, IMA-61 (propylene resin pellets, manufactured by ROHM AND HAAS), NANOCYL SBCX-2821,3689 (silicone acrylate resin pellets, manufactured by Toyo ink manufacturing Co.).
The content of the resin B in the entire magenta ink is preferably 0.5 mass% or more and 20 mass% or less, and more preferably 1 mass% or more and 15 mass% or less in terms of solid content.
The content of the resin B is 0.5% by mass or more, and a sufficient amount of the resin B is secured to form a flat film, and when the content is 20% by mass or less, the transparency of the resin film is secured to improve the color developability of the ink.
< organic solvent >
The organic solvent used in the present invention is not particularly limited, and for example, a water-soluble organic solvent is used. Examples thereof include ethers such as polyhydric alcohols, polyhydric alcohol alkyl ethers and polyhydric alcohol aryl ethers, nitrogen-containing heterocyclic compounds, amides, amines, sulfur-containing yellow compounds, propylene carbonate, ethylene carbonate and the like.
Specific examples of the water-soluble organic solvent include the following:
examples of the polyhydric alcohols include ethylene glycol, diethylene glycol, 1, 2-propanediol, 1, 3-propanediol, 1, 2-butanediol, 1, 3-butanediol, 1, 4-butanediol, 2, 3-butanediol, 3-methyl-1, 3-butanediol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1, 2-pentanediol, 1, 3-pentanediol, 1, 4-pentanediol, 2, 4-pentanediol, 1, 5-pentanediol, 1, 2-hexanediol, 1, 6-hexanediol, 1, 3-hexanediol, 2, 5-hexanediol, 1, 5-hexanediol, glycerol, 1,2, 6-hexanetriol, 2-ethyl-1, 3-hexanediol, ethyl-1, 2, 4-butanetriol, 1,2, 3-butanetriol, 2,2, 4-trimethyl-1, 3-pentanediol, gasoline (petriol), and the like.
Examples of the polyhydric alcohol alkyl ethers include ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether.
Examples of the polyhydric alcohol aryl ethers include ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether.
Examples of the nitrogen-containing heterocyclic compound include 2-pyrrolidone, N-methyl-2-pyrrolidone, N-hydroxyethyl-2-pyrrolidone, 1, 3-dimethyl-2-imidazolidinone, epsilon-caprolactam, and gamma-butyrolactone.
Examples of the amides include formamide, N-methylformamide, N-dimethylformamide, 3-methoxy-N, N-dimethylpropionamide, and 3-butoxy-N, N-dimethylpropionamide.
Examples of the amines include monoethanolamine, diethanolamine, and triethanolamine.
Examples of the sulfur-containing compounds include dimethyl sulfoxide, sulfolane, and thiodiethanol.
Since the drying agent not only functions as a wetting agent but also has good drying properties, it is preferable to use an organic solvent having a boiling point of 250 ℃ or lower.
The content of the organic solvent in the ink is not particularly limited and may be appropriately selected according to the purpose, but is preferably 10 mass% or more and 60 mass% or less, and more preferably 20 mass% or more and 60 mass% or less, from the viewpoint of ink drying property and discharge reliability.
< interfacial activator >
As the surfactant, any of a silicon-based surfactant, a fluorine-based surfactant, an amphoteric surfactant, a nonionic surfactant, and an anionic surfactant can be used.
The silicon-based surfactant is not particularly limited and may be appropriately selected according to the purpose. Among them, silicon-based surfactants which do not decompose even at high pH are preferable, and examples thereof include side chain-modified polydimethylsiloxane, both terminal-modified polydimethylsiloxane, single terminal-modified polydimethylsiloxane, both terminal-modified polydimethylsiloxane of side chain, and the like. A silicon-based surfactant having a polyoxyethylene group or a polyoxyethylene polyoxypropylene group as a modifying group is particularly suitable because it exhibits good properties as an aqueous surfactant. Further, as the silicon-based surfactant, a polyether-modified silicon-based surfactant may be used, and examples thereof include a compound in which a polyalkylene oxide structure is introduced into a side chain of a Si portion of dimethylsiloxane.
As the fluorine-based surfactant, there may be mentioned, for example, a perfluoroalkyl sulfonic acid compound, a perfluoroalkyl carboxylic acid compound, a perfluoroalkyl phosphate ester compound, a perfluoroalkyl ethylene oxide adduct, and a polyoxyalkylene ether polymer compound having a perfluoroalkyl ether group in a side chain, and is particularly suitable because of its small foaming property.
Examples of the perfluoroalkyl sulfonic acid compound include perfluoroalkyl sulfonic acid and perfluoroalkyl sulfonate.
Examples of the perfluoroalkyl carboxylic acid compound include perfluoroalkyl carboxylic acids and perfluoroalkyl carboxylates.
Examples of the polyoxyalkylene ether polymer compound having a perfluoroalkyl ether group in a side chain include sulfuric acid ester salts of polyoxyalkylene ether polymers having a perfluoroalkyl ether group in a side chain, and the like.
Examples of the counter ion of the salt in the fluorine-based surfactant include Li, Na, K and NH4、NH3CH2CH2OH、NH2(CH2CH2OH)2、NH(CH2CH2OH)3And the like.
Examples of the amphoteric surfactant include laurylaminopropionate, lauryldimethylbetaine, stearyldimethylbetaine, and lauryldihydroxyethyl betaine.
Examples of the nonionic surfactant include polyoxyethylene alkylphenyl ethers, polyoxyethylene alkyl esters, polyoxyethylene alkylamines, polyoxyethylene alkylamides, polyoxyethylene propylene block polymers, sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, ethylene oxide adducts of acetylene alcohols, and the like.
Examples of the anionic surfactant include polyoxyethylene alkyl ether acetate, dodecylbenzene sulfonate, laurate, and polyoxyethylene alkyl ether sulfate.
These surfactants may be used alone or in combination.
The silicon-based surfactant is not particularly limited and may be suitably selected according to the purpose, and examples thereof include side chain-modified polydimethylsiloxanes, both-end-modified polydimethylsiloxanes, one-end-modified polydimethylsiloxanes, both-end-modified polydimethylsiloxanes in the side chain, polyether-modified silicon-based surfactants having a polyoxyethylene group or a polyoxyethylene polyoxypropylene group as a modifying group, and are particularly suitable because they exhibit good properties as an aqueous surfactant.
As such a surfactant, those appropriately synthesized or commercially available ones may be used. Commercially available products are available from BYK CHEMIE, shin-Etsu CHEMICAL Co., Ltd., Silicon Dow Corning Toray, Japan latex Co., Ltd., KYOEISHA CHEMICAL Co., Ltd.
The polyether-modified silicon surfactant is not particularly limited and may be appropriately selected according to the purpose, and examples thereof include compounds represented by the general formula (S-1) in which a polyalkylene oxide structure is introduced into a side chain of the Si portion of dimethylpolysiloxane.
General formula (S-1):
X-R(C2H4O)a(C3H6O)bR′
in the general formula (S-1), m, n, a, and b are each independently an integer, R represents an alkylene group, and R' represents an alkyl group.
As the polyether-modified Silicon surfactant, commercially available products can be used, and examples thereof include KF-618, KF-642, KF-643 (shin-Etsu chemical Co., Ltd.), EMLEX-SS-5602, SS-1906EX (Japan latex Co., Ltd.), FZ-2105, FZ-2118, FZ-2154, FZ-2161, FZ-2163, FZ-2164(Silicon Dow Corning Toray Co., Ltd.), BYK-33, BYK-387(BYK CHEMIE Co., Ltd.), TSF4440, TSF4452, and TSF4453 (Toshiba Silicon Co., Ltd.).
The fluorine-based surfactant is preferably a compound having 2 to 16 carbon atoms substituted with fluorine, and more preferably a compound having 4 to 16 carbon atoms substituted with fluorine.
Examples of the fluorine-based surfactant include perfluoroalkyl phosphate ester compounds, perfluoroalkyl ethylene oxide adducts, and polyoxyalkylene ether polymer compounds having a perfluoroalkyl ether group in a side chain.
Among these, polyoxyalkylene ether polymer compounds having a perfluoroalkyl ether group in the side chain are preferable because of their low foaming properties, and fluorine-based surfactants represented by the general formulae (F-1) and (F-2) are particularly preferable.
General formula (F-1):
CF3CF2(CF2CF2)m-CH2CH2O(CH2CH2O)nH
in the compounds represented by the above general formula (F-1), m is preferably an integer of 0 to 10, and n is preferably an integer of 0 to 40, for imparting water solubility.
General formula (F-2):
CnF2n+1-CH2CH(OH)CH2-O-(CH2CH2O)a-Y
in the compound represented by the above general formula (F-2), Y is H, or CmF2m+1(m is an integer of 1 to 6), or CH2CH(OH)CH2-CmF2m+1(m is an integer of 4 to 6), or CpF2p+1(p is an integer of 1 to 19). n is an integer of 1 to 6. a is an integer of 4 to 14.
As the fluorine-based surfactant, commercially available products can be used.
Examples of such commercially available products include SURLON S-111, S-112, S-113, S-121, S-131, S-132, S-141 and S-145 (all manufactured by ASAHI GLASS Co.); FLUORAD FC-93, FC-95, FC-98, FC-129, FC-135, FC-170C, FC-430, FC-431 (all manufactured by Sumitomo 3M Co.); MEGAFACE F-470, F-1405, F-474 (all manufactured by Dainippon ink chemical industries, Inc.); ZONYL TBS, FSP, FSA, FSN-100, FSN, FSO-100, FSO, FS-300, UR, CAPSTONE FS-30, FS31, FS-3100, FS-34, FS-35 (all manufactured by Chemours); FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW (all manufactured by NEOS corporation); POLY FOX PF-136A, PF-156A, PF-151N, PF-154, PF-159 (manufactured by OMNOVA Inc.); unidyne DSN-403N (Daikin industries, Inc.), and the like. Among them, FS-3100, FS-34, FS-300, FT-110, FT-250, FT-251, FT-400S, FT-150, FT-400SW, POLY FOX PF-151N manufactured by OMNOVA, and Unidyne DSN-403N manufactured by Daikin industries, all of which are manufactured by Chemours, are particularly preferable from the viewpoint of improving good printing quality, particularly remarkably improving color development, permeability to paper, wettability, and leveling property.
The content of the surfactant in the ink is not particularly limited, and may be appropriately selected according to the purpose, and is preferably 0.001 mass% or more and 5 mass% or less, and more preferably 0.05 mass% or more and 5 mass% or less, from the viewpoint of excellent wettability and discharge stability and improvement of image quality.
< antifoam agent >
The defoaming agent is not particularly limited, and examples thereof include a silicon defoaming agent, a polyether defoaming agent, and a fatty acid ester defoaming agent. These may be used alone or in combination of two or more. Among them, a silicon-based defoaming agent is preferable in terms of excellent defoaming effect.
< anticorrosive mildew preventive >
The preservative and antifungal agent is not particularly limited, and examples thereof include 1, 2-benzothiazepine-3-one and the like.
< anti-rust agent >
The rust inhibitor is not particularly limited, and examples thereof include acid sulfite and sodium thiosulfate.
< pH adjuster >
The pH adjuster is not particularly limited as long as it can adjust the pH to 7 or more, and examples thereof include amines such as diethanolamine and triethanolamine.
< non-absorptive recording Medium >
The non-absorbent recording medium of the present invention is a recording medium having a surface with low water permeability, absorbency and/or adsorbability, and includes a material that does not open to the outside even if many voids are present therein.
More quantitatively, the Bristow method refers to the method of contactStarting at 30msec1/2Has a water absorption of 10mL/m2The following recording medium.
Examples of the non-absorbent recording medium include plastic substrates such as polypropylene films, polyethylene terephthalate films, and nylon films.
Examples of the polypropylene film include P-1002, P-2161 and P-4166 available from Toyobo Co., Ltd, PA-20, PA-30 and PA-20W available from SUNTOX Co., Ltd, FOA, FOS and FOR available from FUTAMURA chemical Co., Ltd.
Examples of the polyethylene terephthalate film include E-5100 and E-5102 available from Toyobo Co., Ltd., P60 and P375 available from TORAY Co., Ltd., G2, G2P2 and K, SL available from Ditu DUPONT film Co., Ltd.
Examples of the nylon film include HARDEN films N-1100, N-1102 and N-1200 manufactured by Toyobo Co., Ltd, and ON, NX, MS and NK manufactured by UNITIKA Co., Ltd.
Further, in addition to the plastic substrate, an inorganic substrate such as glass, metal, or ceramic may be used, and a plurality of the above-mentioned single materials may be combined.
< recording apparatus, recording method >
The ink of the present invention can be suitably used for various recording apparatuses of an ink jet recording system, for example, printers, facsimile apparatuses, copying apparatuses, printing/facsimile/copying multifunction peripherals, stereolithography apparatuses, and the like.
In the present invention, the recording apparatus and the recording method are apparatuses capable of discharging ink, various processing liquids, and the like to a recording medium, and a method of recording using the apparatuses. The recording medium means that ink or various processing liquids can be attached even at a time.
The recording apparatus includes not only the head portion for discharging ink but also means related to feeding, conveying, and discharging of the recording medium, and further includes devices called a pre-processing device and a post-processing device.
The recording apparatus and the recording method may further include a heating means for the heating step and a drying means for the drying step. The heating means and the drying means include, for example, means for heating and drying the print surface or the back surface of the recording medium. The heating means and the drying means are not particularly limited, and for example, a hot air heater or an infrared heater can be used. The heating and drying may be performed before, during, after printing, or the like.
The recording apparatus and the recording method are not limited to the formation of a visualized image such as characters and graphics with ink. For example, a pattern forming a geometric pattern or the like, and a three-dimensional image may be formed.
The recording device may include, unless otherwise specified, a tandem type device that moves the discharge head or a linear type device that does not move the discharge head.
The recording apparatus includes not only a desktop type but also a wide recording apparatus capable of printing on an AO-size medium or a continuous form printer capable of using a continuous sheet wound in a roll shape as a recording medium.
An example of the recording apparatus will be described with reference to fig. 1 and 2. Fig. 1 is a perspective explanatory view of the apparatus. Fig. 2 is a perspective explanatory view of the main tank. The
On the other hand, when the
The recording apparatus may include not only a portion for discharging ink but also an apparatus called a pre-processing apparatus and a post-processing apparatus.
As one embodiment of the pretreatment apparatus and the post-treatment apparatus, the following embodiments are provided as in the case of black (K), cyan (C), magenta (M), and yellow (Y) inks: a liquid containing part and a liquid nozzle having a pretreatment liquid and a post-treatment liquid are added, and the pretreatment liquid and the post-treatment liquid are discharged by an ink jet recording method.
As another embodiment of the pretreatment apparatus and the post-treatment apparatus, there is an embodiment in which a pretreatment apparatus and a post-treatment apparatus by a blade coating method, a roll coating method, or a spray coating method are provided in addition to the inkjet recording method.
The method of using the ink is not limited to the inkjet recording method, and can be widely used. In addition to the ink jet recording system, for example, a blade coating method, a gravure coating method, a bar coating method, a roll coating method, a dip coating method, a curtain coating method, a slide coating method, a die coating method, a spray coating method, and the like can be cited.
An image forming apparatus according to the present invention includes:
a means for applying a pretreatment liquid containing a metal salt and a resin A to a recording medium; and
a means for applying magenta ink to the recording medium coated with the pretreatment liquid by using an ink jet head;
the above magenta ink is a magenta ink containing c.i. pigment red 269 represented by the above structural formula (1) and a resin B;
the resin B is a resin having a higher glass transition temperature than the resin A;
the recording medium is a non-absorptive recording medium.
Further, the inkjet head is preferably an inkjet head including a plurality of nozzles for discharging ink, and the inkjet head preferably includes individual liquid chambers leading to the nozzles, a common liquid chamber for supplying ink to the individual liquid chambers, a circulation flow path leading to the individual liquid chambers, a circulation common liquid chamber leading to the circulation flow path, and a pressure generating means for applying pressure to the ink in the individual liquid chambers.
By using the image forming apparatus having such an ink circulation system, even when printing is performed for a long period of time using an ink having a resin, good discharge stability can be obtained.
The inkjet head of the present invention may be, for example, the following inkjet head.
An example will be described with reference to fig. 3, 4, 5, 6, 7a to 7f, 8a, and 8 b. Fig. 3 is a perspective view showing an example of an ink jet head in the ink jet printing apparatus according to the present invention. Fig. 4 is a cross-sectional explanatory view in a direction orthogonal to the nozzle arrangement direction of the inkjet head of fig. 3. Fig. 5 is a partial cross-sectional explanatory view in a direction parallel to the nozzle arrangement direction of the ink jet head of fig. 3. Fig. 6 is a plan explanatory view of a nozzle plate of the inkjet head of fig. 3. Fig. 7a to 7f are plan explanatory views of respective members constituting a flow path member of the ink jet head of fig. 3. Fig. 8a and 8b are plan explanatory views of respective members constituting the common liquid chamber member of the inkjet head of fig. 3.
The
The
The
The diaphragm member 3 is provided with a
The diaphragm member 3 is a wall surface member that forms a wall surface of the individual
Here, in the
As shown in fig. 7a, the plate-
Similarly, as shown in fig. 7b, the plate-
Similarly, as shown in fig. 7c, the plate-
Similarly, as shown in fig. 7d, the plate-
Similarly, as shown in fig. 7e, the plate-
As shown in fig. 7f, the
Thus, by laminating and joining a plurality of plate-like members to form the flow path member, a complicated flow path can be formed with a simple structure.
With the above configuration, the
On the other hand, the common
As shown in fig. 8a, the first common
As shown in fig. 8B, the second common
Through
In FIGS. 8a and 8b, the bottomed groove portions are shown by hatching (the same applies to the following figures).
In this way, the common
Here, the first common
In this case, the downstream
Thus, the size (dimension) of the circulating
Further, since the circulating
On the other hand, a piezoelectric actuator 11 is disposed on the side of the diaphragm member 3 opposite to the individual
As shown in fig. 5, the piezoelectric actuator 11 includes a
Here, the
The
The
In the ink jet head configured as described above, when the voltage applied to the
Thereafter, the voltage applied to the
Then, by returning the voltage applied to the
The method of driving the head is not limited to the above example (pull-push), and the pull or push may be performed by applying a drive waveform. In the above-described embodiment, the stacked piezoelectric member is used as the means for supplying pressure fluctuation to the individual
Next, an example of the ink circulation system using the ink jet head according to the present embodiment will be described with reference to fig. 9.
Fig. 9 is a block diagram showing an example of an ink circulation system according to the present invention.
As shown in fig. 9, the ink circulation system includes a main tank, an ink jet head, a supply tank, a circulation tank, a compressor, a vacuum pump, a first liquid sending pump, a second liquid sending pump, a regulator (R), a supply-side pressure sensor, a circulation-side pressure sensor, and the like. The supply-side pressure sensor is located between the supply tank and the inkjet head, and is connected to the supply flow path side connected to a supply port 71 (see fig. 3) of the inkjet head. The circulation-side pressure sensor is located between the ink jet head and the circulation tank, and is connected to the circulation flow path side connected to the circulation port 81 (see fig. 3) of the ink jet head.
One side of the circulation tank is connected to the supply tank by a first liquid-feeding pump, and the other side of the circulation tank is connected to the main tank by a second liquid-feeding pump. As a result, the ink flows from the supply tank into the inkjet head through the
A compressor, not shown, is connected to the supply tank, and a supply-side pressure sensor detects and controls the pressure to a set positive pressure. On the other hand, a vacuum pump, not shown, is connected to the circulation tank, and the negative pressure set by the control is detected by a circulation-side pressure sensor. This allows the ink to circulate through the ink jet head while maintaining the negative pressure of the meniscus constant.
Further, since the amount of the ink in the supply tank and the circulation tank decreases when the liquid droplets are discharged from the nozzles of the inkjet head, it is desirable to appropriately replenish the ink from the main tank to the circulation tank using the second liquid-feeding pump. The time for replenishing the ink from the main tank to the circulation tank may be set so that the ink replenishment is performed when the liquid level of the ink in the circulation tank is equal to or lower than a set level, and may be controlled based on a detection result of a liquid level sensor or the like provided in the circulation tank.
Next, the above-described ink circulation in the inkjet head will be described. As shown in fig. 3, at the end of the common
Further, the ink in the individual
The circulation of the ink may be performed not only when the inkjet head is operated but also when the operation is stopped. When the operation is stopped, the ink in the individual
An apparatus for forming an image with ink after applying the pretreatment liquid to a material to be printed will be described with reference to fig. 12. Fig. 12 shows an example of a recording apparatus of a type in which an ink jet recording head scans and forms an image.
In the apparatus shown in fig. 12, the
FIG. 13 shows an example of a pretreatment liquid apparatus. The pretreatment liquid apparatus shown in fig. 13 stores a
In this way, when the
The method of applying the pretreatment liquid in the pretreatment section is not limited to the roll coating method, and examples thereof include a blade coating method, a gravure offset coating method, and a bar coating method.
The
The dried
Image formation, recording, printing, and the like in the terms of the present invention are synonymous.
Recording media, printed matter, and the like are synonymous terms.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：热熔型超疏水缓蚀包覆防腐材料及其制备方法