JP5928813B2 - Water-based ink for ink jet recording, ink cartridge, ink jet recording apparatus, and ink jet recording method - Google Patents

Description

  The present invention relates to an aqueous ink for inkjet recording, an ink cartridge, an inkjet recording apparatus, and an inkjet recording method.

  It is important for water-based ink for inkjet recording to suppress thickening and solidification due to drying in order to enable stable ejection. Therefore, wetting agents (anti-drying agents) are generally used for water-based inks for inkjet recording. For example, a water-based ink for inkjet recording using a triol such as trimethylolpropane and 1,2,6-hexanetriol as a wetting agent has been proposed (Patent Document 1).

JP 2003-327872 A

  However, the water-based ink for ink jet recording using triol has a relatively high viscosity of triol, so that the effect of suppressing the increase in viscosity after drying is not sufficient. Therefore, further suppression of thickening after drying is demanded for water-based ink for ink jet recording using triol.

  Accordingly, an object of the present invention is to provide a water-based ink for ink-jet recording in which thickening after drying is further suppressed as compared with a conventional water-based ink.

In order to achieve the above object, the water-based ink for inkjet recording of the present invention comprises:
A water-based ink for inkjet recording comprising a colorant, water and a wetting agent,
The wetting agent comprises at least one triol selected from the group consisting of 1,2,4-butanetriol, 1,2,5-pentanetriol and 1,2,6-hexanetriol;
The water-based ink further contains raffinose or a derivative thereof,
The blending amount of the raffinose or a derivative thereof with respect to the total amount of the water-based ink is 0.5% by weight to 1% by weight.

  Since the water-based ink of the present invention uses the specific triol as a wetting agent and contains the predetermined amount of raffinose or a derivative thereof, thickening after drying is further suppressed as compared with the conventional water-based ink.

FIG. 1 is a schematic perspective view showing an example of the configuration of the ink jet recording apparatus of the present invention.

  The degree of thickening after drying of the water-based ink can be evaluated using, for example, the flowability after evaporation and the viscosity after evaporation. In the present invention, “fluidity after evaporation” means, for example, after evaporating water-based ink for inkjet recording (hereinafter sometimes referred to as “water-based ink” or “ink”) in an open container. It means the fluidity of water-based ink when the open container is tilted. In the present invention, the “viscosity after evaporation” means the viscosity of the water-based ink after evaporation.

  The water-based ink of the present invention will be described. The aqueous ink of the present invention contains a colorant, water and a wetting agent.

  The colorant may be either a pigment or a dye, but is preferably a pigment.

  Examples of the pigment include carbon black, inorganic pigments, and organic pigments. Examples of the carbon black include furnace black, lamp black, acetylene black, and channel black. Examples of the inorganic pigment include titanium oxide, iron oxide inorganic pigment, and carbon black inorganic pigment. Examples of the organic pigment include azo pigments such as azo lakes, insoluble azo pigments, condensed azo pigments and chelate azo pigments; phthalocyanine pigments, perylene and perinone pigments, anthraquinone pigments, quinacridone pigments, dioxazine pigments, thioindigo pigments, isoindolinone pigments, Examples thereof include polycyclic pigments such as quinophthalone pigments; dye lake pigments such as basic dye type lake pigments and acid dye type lake pigments; nitro pigments; nitroso pigments; aniline black daylight fluorescent pigments; Also, other pigments can be used as long as they can be dispersed in the aqueous phase. Specific examples of these pigments include C.I. I. Pigment Black 1, 6, and 7; C.I. I. Pigment Yellow 1, 2, 3, 12, 13, 14, 15, 16, 17, 55, 78, 150, 151, 154, 180, 185 and 194; I. Pigment oranges 31 and 43; C.I. I. Pigment Red 2, 3, 5, 6, 7, 12, 15, 16, 48, 48: 1, 53: 1, 57, 57: 1, 112, 122, 123, 139, 144, 146, 149, 166, 168, 175, 176, 177, 178, 184, 185, 190, 202, 221, 222, 224 and 238; I. Pigment violet 196; C.I. I. Pigment blue 1, 2, 3, 15, 15: 1, 15: 2, 15: 3, 15: 4, 16, 22 and 60; C.I. I. Pigment green 7 and 36, and the like.

  The pigment may be a self-dispersing pigment. In the self-dispersing pigment, for example, at least one of a hydrophilic functional group such as a carbonyl group, a hydroxyl group, a carboxylic acid group, a sulfonic acid group, and a phosphoric acid group and a salt thereof is directly or other than the pigment particle. By being introduced through a chemical bond, it can be dispersed in water without using a dispersant. The self-dispersing pigment is treated with a pigment by a method described in, for example, JP-A-8-3498, JP-T 2000-513396, JP-T 2008-524400, JP-T 2009-515007, and the like. Can be used. As the raw material for the self-dispersing pigment, both inorganic pigments and organic pigments can be used. Examples of pigments suitable for performing the treatment include carbon blacks such as “MA8” and “MA100” manufactured by Mitsubishi Chemical Corporation. As the self-dispersing pigment, for example, a commercially available product may be used. Examples of the commercially available products include “CAB-O-JET (registered trademark) 200”, “CAB-O-JET (registered trademark) 250C”, “CAB-O-JET (registered trademark)” manufactured by Cabot Specialty Chemicals. Trademark) 260M "," CAB-O-JET (registered trademark) 270Y "," CAB-O-JET (registered trademark) 300 "," CAB-O-JET (registered trademark) 400 "," CAB-O-JET " (Registered trademark) 450C "," CAB-O-JET (registered trademark) 465M "and" CAB-O-JET (registered trademark) 470Y ";" BONJET (registered trademark) BLACK CW- "manufactured by Orient Chemical Co., Ltd. 2 "and" BONJET (registered trademark) BLACK CW-3 ";" LIOJET (registered trademark) WD BLACK 002 "manufactured by Toyo Ink Manufacturing Co., Ltd. "; And the like.

  The solid content blending amount (pigment solid content) of the pigment with respect to the total amount of the water-based ink is not particularly limited, and can be appropriately determined according to, for example, a desired optical density or color. The pigment solid content is, for example, 0.1% by weight to 20% by weight, preferably 1% by weight to 10% by weight, and more preferably 2% by weight to 8% by weight. The pigment solid content is more preferably 2% by weight to 4% by weight from the viewpoint of improving the solubility of raffinose or a derivative thereof.

  The dye is not particularly limited, and examples thereof include direct dyes, acid dyes, basic dyes, and reactive dyes. Specific examples of the dye include C.I. I. Direct black, C.I. I. Direct Blue, C.I. I. Direct Red, C.I. I. Direct yellow, C.I. I. Direct orange, C.I. I. Direct violet, C.I. I. Direct Brown, C.I. I. Direct Green, C.I. I. Acid Black, C.I. I. Acid Blue, C.I. I. Acid Red, C.I. I. Acid Yellow, C.I. I. Acid Orange, C.I. I. Acid Violet, C.I. I. Basic Black, C.I. I. Basic blue, C.I. I. Basic Red, C.I. I. Basic violet and C.I. I. For example, food black. C. above. I. Examples of direct black include C.I. I. Direct black 17, 19, 32, 51, 71, 108, 146, 154, 168 and the like can be mentioned. C. above. I. Examples of direct blue include C.I. I. Direct blue 6, 22, 25, 71, 86, 90, 106, and 199. C. above. I. Examples of direct red include C.I. I. Direct Red 1, 4, 17, 28, 83, and 227 are listed. C. above. I. Examples of direct yellow include C.I. I. Direct yellow 12, 24, 26, 86, 98, 132, 142 and 173. C. above. I. Examples of direct orange include C.I. I. Direct orange 34, 39, 44, 46, 60, etc. are mentioned. C. above. I. Examples of direct violet include C.I. I. And direct violet 47 and 48. C. above. I. Examples of direct brown include C.I. I. Direct brown 109 etc. are mention | raise | lifted. C. above. I. Examples of direct green include C.I. I. Direct green 59 etc. are mention | raise | lifted. C. above. I. Examples of acid black include C.I. I. Acid Black 2, 7, 24, 26, 31, 52, 63, 112, 118 and the like. C. above. I. Examples of acid blue include C.I. I. Acid Blue 9, 22, 40, 59, 90, 93, 102, 104, 117, 120, 167, 229 and 234. C. above. I. As acid red, for example, C.I. I. Acid Red 1, 6, 32, 37, 51, 52, 80, 85, 87, 92, 94, 115, 180, 256, 289, 315 and 317. C. above. I. Examples of acid yellow include C.I. I. Acid yellow 11, 17, 23, 25, 29, 42, 61, 71 and the like. C. above. I. Examples of acid orange include C.I. I. Acid oranges 7 and 19 and the like. C. above. I. Examples of acid violet include C.I. I. Acid Violet 49 and the like. C. above. I. Examples of basic black include C.I. I. Basic black 2 etc. are raised. C. above. I. Examples of basic blue include C.I. I. Basic blue 1, 3, 5, 7, 9, 24, 25, 26, 28 and 29 are listed. C. above. I. Examples of basic red include C.I. I. Basic Red 1, 2, 9, 12, 13, 14, and 37 are listed. C. above. I. Examples of basic violet include C.I. I. And basic violet 7, 14, and 27. C. above. I. Examples of food black include C.I. I. Food black 1 and 2 etc. are mentioned.

  The blending amount of the dye with respect to the total amount of the water-based ink is not particularly limited, and is, for example, 0.1% by weight to 20% by weight, and preferably 0.3% by weight to 10% by weight.

  The colorant may be used alone or in combination of two or more.

  The water is preferably ion exchange water or pure water. The blending amount (water ratio) of the water with respect to the total amount of the water-based ink is, for example, 10% by weight to 90% by weight, and preferably 40% by weight to 80% by weight. The said water ratio is good also as the remainder of another component, for example.

  As described above, the water-based ink is at least one triol selected from the group consisting of 1,2,4-butanetriol, 1,2,5-pentanetriol and 1,2,6-hexanetriol as a wetting agent. including. The water-based ink of the present invention contains the specific triol as the wetting agent, so that the viscosity after drying can be suppressed, and the triol has a property of being easily mixed with a highly hydrophobic material. Therefore, there is an advantage that there is a wide range of selection of water-based ink materials such as penetrants and surfactants. The blending amount of the specific triol with respect to the total amount of the water-based ink is, for example, 5% by weight to 60% by weight. By setting the blending amount of the specific triol to 5% by weight or more, volatilization of the water-based ink is suitably suppressed. Moreover, the viscosity increase of the said water-based ink is suppressed suitably by the compounding quantity of the said specific triol being 60 weight% or less. The blending amount of the specific triol is preferably 10% by weight to 50% by weight. The blending amount of the specific triol is more preferably 15% by weight to 25% by weight from the viewpoint of improving the solubility of raffinose or a derivative thereof. The wetting agent may include other wetting agents other than the specific triol, but is preferably composed of only the specific triol. One type of the specific triol may be used alone, or two or three types may be used in combination. The wetting agent is particularly preferably 1,2,4-butanetriol among the specific triols. Since the specific triol has a high hydroxyl group content ratio relative to the molecular weight, it is easy to solvate with components such as pigments and can suppress aggregation of components such as pigments even after drying, but triethylene glycol or dipropylene glycol Those having a low proportion of hydroxyl groups relative to the molecular weight, etc., do not exhibit an aggregation suppressing effect.

  The other wetting agent is not particularly limited, and examples thereof include lower alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol; dimethylformamide, Amides such as dimethylacetamide; Ketones such as acetone; Keto alcohols such as diacetone alcohol; Ethers such as tetrahydrofuran and dioxane; Polyhydric alcohols such as polyalkylene glycol, alkylene glycol, glycerin and trimethylolpropane; 2-pyrrolidone; N- Methyl-2-pyrrolidone; 1,3-dimethyl-2-imidazolidinone and the like. Examples of the polyalkylene glycol include polyethylene glycol and polypropylene glycol. Examples of the alkylene glycol include ethylene glycol, propylene glycol, butylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, thiodiglycol, and hexylene glycol. The other wetting agents may be used alone or in combination of two or more. Among these, polyhydric alcohols such as alkylene glycol and glycerin are preferable.

  The water-based ink may further contain a penetrant. Examples of the penetrant include glycol ether. Examples of the glycol ether include ethylene glycol methyl ether, ethylene glycol ethyl ether, ethylene glycol-n-propyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, diethylene glycol-n-propyl ether, diethylene glycol-n-butyl ether, diethylene glycol-n- Hexyl ether, triethylene glycol methyl ether, triethylene glycol ethyl ether, triethylene glycol-n-propyl ether, triethylene glycol-n-butyl ether, propylene glycol methyl ether, propylene glycol ethyl ether, propylene glycol-n-propyl ether, Propylene glycol-n-butyl ether , Dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol-n-propyl ether, dipropylene glycol-n-butyl ether, tripropylene glycol methyl ether, tripropylene glycol ethyl ether, tripropylene glycol-n-propyl ether And tripropylene glycol-n-butyl ether. The said penetrant may be used individually by 1 type, and may use 2 or more types together.

  The blending amount of the penetrant with respect to the total amount of the water-based ink is, for example, 0% by weight to 20% by weight, preferably 0.1% by weight to 15% by weight, and more preferably 0.5% by weight to 10% by weight.

  As described above, the water-based ink further contains raffinose or a derivative thereof. An aqueous ink to which raffinose or a derivative thereof, which is one of saccharides, is added is resistant to drying and has an effect of maintaining fluidity after evaporation. This is because raffinose or a derivative thereof is a saccharide having a plurality of hydroxyl groups in the molecule, so it has high water retention, and since it is a trisaccharide having different types of sugars as structural units, the molecule is bulky, It is thought to be due to the structural characteristics that components such as pigments are prevented from approaching each other and their aggregation can be suppressed. Even in the same saccharide, other sugar compounds other than raffinose or a derivative thereof such as glucose and maltose do not have such an effect, and can be said to have a characteristic characteristic of raffinose or a derivative thereof. However, this mechanism is only an estimation, and the present invention is not limited to this. The raffinose derivative is not particularly limited, and examples thereof include tetrachlororaffinose, raffinose undecaacetate, raffinose undecapropanoate, and the like. The blending amount of the raffinose or a derivative thereof with respect to the total amount of the water-based ink is 0.5% by weight to 1% by weight. By setting the blending amount of raffinose or a derivative thereof within the above range, thickening of the water-based ink is suppressed. The blending amount of raffinose or a derivative thereof is the blending amount of raffinose alone when raffinose derivative is not used, the blending amount of raffinose derivative alone when raffinose is not used, and raffinose and raffinose derivative when both are used. Includes total blending amount.

  The water-based ink may further contain a conventionally known additive as required. Examples of the additive include a surfactant, a pH adjuster, a viscosity adjuster, a surface tension adjuster, and an antifungal agent. Examples of the viscosity modifier include polyvinyl alcohol, cellulose, and a water-soluble resin.

  The water-based ink is, for example, a colorant, water, the specific triol and raffinose or a derivative thereof, and, if necessary, other additive components uniformly mixed by a conventionally known method, and is insoluble in a filter or the like. Can be prepared by removing.

  Next, the ink cartridge of the present invention will be described. The ink cartridge of the present invention is an ink cartridge containing a water-based ink for ink-jet recording, and the water-based ink is the water-based ink for ink-jet recording of the present invention. As the main body of the ink cartridge, for example, a conventionally known one can be used.

  Next, the ink jet recording apparatus and the ink jet recording method of the present invention will be described.

  The ink jet recording apparatus of the present invention is an ink jet recording apparatus that includes an ink storage portion and an ink discharge means, and discharges ink stored in the ink storage portion by the ink discharge means. The water-based ink for inkjet recording is accommodated.

  The ink jet recording method of the present invention is an ink jet recording method for recording by ejecting a water-based ink onto a recording medium by an ink jet method, wherein the water-based ink for ink-jet recording of the present invention is used as the water-based ink.

  The ink jet recording method of the present invention can be performed using, for example, the ink jet recording apparatus of the present invention. The recording includes printing, printing, printing, and the like.

  FIG. 1 shows the configuration of an example of the ink jet recording apparatus of the present invention. As shown in the figure, this ink jet recording apparatus 1 includes four ink cartridges 2, an ink discharge means (ink jet head) 3, a head unit 4, a carriage 5, a drive unit 6, a platen roller 7, and a purge device 8. And as a major component.

  The four ink cartridges 2 contain one color each of four colors of water-based inks of yellow, magenta, cyan, and black. For example, the water-based black ink is the water-based ink for inkjet recording of the present invention. Other water-based inks may be general water-based inks. The ink jet head 3 installed in the head unit 4 performs recording on a recording medium (for example, recording paper) P. Four ink cartridges 2 and a head unit 4 are mounted on the carriage 5. The drive unit 6 reciprocates the carriage 5 in the linear direction. As the drive unit 6, for example, a conventionally known one can be used (for example, see Japanese Patent Application Laid-Open No. 2008-246821). The platen roller 7 extends in the reciprocating direction of the carriage 5 and is disposed to face the inkjet head 3.

  The purge device 8 sucks out defective ink containing bubbles and the like accumulated in the ink jet head 3. As the purge device 8, for example, a conventionally known device can be used (see, for example, JP-A-2008-246821).

  A wiper member 20 is disposed adjacent to the purge device 8 on the platen roller 7 side of the purge device 8. The wiper member 20 is formed in a spatula shape, and wipes the nozzle formation surface of the inkjet head 3 as the carriage 5 moves. In FIG. 1, a cap 18 covers a plurality of nozzles of the inkjet head 3 that is returned to the reset position when recording is completed in order to prevent the water-based ink from drying.

  In the ink jet recording apparatus 1 of this example, four ink cartridges 2 are mounted on one carriage 5 together with the head unit 4. However, the present invention is not limited to this. In the ink jet recording apparatus, each of the four ink cartridges 2 may be mounted on a carriage different from the head unit 4. Further, each of the four ink cartridges 2 may not be mounted on the carriage 5 but may be arranged and fixed in the ink jet recording apparatus. In these aspects, for example, each cartridge of the four ink cartridges 2 and the head unit 4 mounted on the carriage 5 are connected by a tube or the like, and each cartridge of the four ink cartridges 2 is connected to the head unit 4 from the cartridge. Aqueous ink is supplied.

  Ink jet recording using this ink jet recording apparatus 1 is performed as follows, for example. First, the recording paper P is fed from a paper feed cassette (not shown) provided on the side of or below the ink jet recording apparatus 1. The recording paper P is introduced between the inkjet head 3 and the platen roller 7. Predetermined recording is performed on the introduced recording paper P by water-based ink ejected from the inkjet head 3. The water-based ink of the present invention can be stably ejected from the inkjet head 3 because the viscosity increase after drying is further suppressed as compared with the conventional water-based ink. The recording sheet P after recording is discharged from the inkjet recording apparatus 1. In FIG. 1, the paper feed mechanism and paper discharge mechanism for the recording paper P are not shown.

  The apparatus shown in FIG. 1 employs a serial type ink jet head, but the present invention is not limited to this. The ink jet recording apparatus may be an apparatus that employs a line type ink jet head.

  According to the present invention, at least one triol selected from the group consisting of a colorant, water, 1,2,4-butanetriol, 1,2,5-pentanetriol and 1,2,6-hexanetriol. A thickening inhibitor for suppressing thickening of an aqueous ink for inkjet recording, comprising: raffinose or a derivative thereof, and the raffinose or the total amount of the aqueous ink. A thickening inhibitor is provided which is added to the water-based ink so that the amount of the derivative is 0.5 wt% to 1 wt%.

  Further, according to the present invention, at least one selected from the group consisting of a colorant, water, 1,2,4-butanetriol, 1,2,5-pentanetriol, and 1,2,6-hexanetriol. A thickening suppressing method for suppressing thickening of a water-based ink for ink-jet recording comprising a triol, comprising an addition step of adding a thickening inhibitor to the aqueous ink, wherein the thickening inhibitor is raffinose or its In the addition step, the thickening inhibitor is added to the aqueous ink so that the amount of raffinose or a derivative thereof is 0.5 wt% to 1 wt% with respect to the total amount of the aqueous ink. There is provided a method for inhibiting thickening.

  In the thickening inhibitor and the thickening inhibiting method, the types, blending amounts, forms, and the like of various components such as a colorant can be the same as those of the aqueous inkjet recording ink of the present invention.

  Next, examples of the present invention will be described together with comparative examples. In addition, this invention is not limited and restrict | limited by the following Example and comparative example.

[Examples 1-1 to 3 and Comparative Examples 1-1 to 5]
Ink compositions (Table 1) except for self-dispersing carbon black were uniformly mixed to obtain an ink solvent. Next, the ink solvent was added to the self-dispersing carbon black dispersed in water and mixed uniformly. Then, the obtained mixture was filtered with a cellulose acetate type membrane filter (pore size: 3.00 μm) manufactured by Toyo Roshi Kaisha, Ltd., so that the inkjet recordings of Examples 1-1 to 1-3 and Comparative Examples 1-1 to 5 were performed. A water-based ink was obtained.

  For the water-based inks of Examples and Comparative Examples, (a) fluidity evaluation after evaporation and (b) viscosity measurement after evaporation were carried out by the following methods.

(A) Fluidity evaluation after evaporation 5 g of the aqueous inks of Examples and Comparative Examples were injected into an open bottle (caliber: 20.2 mm). Subsequently, the open bottle was stored for 5 days in a thermostatic bath at a temperature of 60 ° C. and a relative humidity of 40%. Next, the state of the aqueous ink in the open bottle after the storage was visually observed, and the fluidity after evaporation of the aqueous ink was evaluated according to the following evaluation criteria.

Evaluation of fluidity after evaporation of water-based ink Evaluation standard A: Flowability of water-based ink was observed B: When an impact was given to the open bottle, fluidity was found to be water-based ink C: Shock was given to the open bottle However, no fluidity was found in the water-based ink.

(B) Viscosity measurement after evaporation The viscosity of the water-based ink in the open bottle after storage in the fluidity evaluation after evaporation was determined using a viscometer (AR Instruments G-TA2 manufactured by TA Instruments). The measurement was performed under the conditions of a rotation speed of 10 times / second and a measurement temperature of 25 ° C.

  Table 1 shows the water-based ink compositions and evaluation / measurement results of the water-based inks of Examples and Comparative Examples.

  As shown in Table 1, in Examples 1-1 and 1-2 using 1,2,4-butanetriol as a wetting agent, the same wetting agent was used, and Comparative Example 1-1 containing no raffinose or a derivative thereof was used. The viscosity change rate after evaporation as a reference was less than 1, and the thickening after drying was suppressed. In Examples 1-1 and 1-2 using 1,2,4-butanetriol as a wetting agent, the evaluation results of the fluidity after evaporation were particularly excellent. On the other hand, in Comparative Examples 1-2 and 1-3 containing 0.4% by weight or 1.1% by weight of raffinose, the viscosity change rate after the evaporation exceeded 1.

  Further, in Example 2 using 1,2,5-pentanetriol as a wetting agent, the same wetting agent was used, and the viscosity change rate after evaporation based on Comparative Example 2 not containing raffinose or its derivative was 1. The viscosity increase after drying was suppressed. Similarly, in Example 3 using 1,2,6-hexanetriol as the wetting agent, the same wetting agent was used, and the rate of change in viscosity after evaporation based on Comparative Example 3 containing no raffinose or its derivative was 1. The thickening after drying was suppressed.

  And in the comparative example 4 using the trimethylol propane which is a triol as a wetting agent, the evaluation result of the fluidity | liquidity after evaporation was bad. Furthermore, in Comparative Example 5 in which only the raffinose was used without using the wetting agent, the evaluation result of the fluidity after evaporation was poor.

  As described above, in the water-based ink of the present invention, thickening after drying is further suppressed as compared with conventional water-based inks. The use of the water-based ink of the present invention is not particularly limited, and can be widely applied to various ink jet recordings.

DESCRIPTION OF SYMBOLS 1 Inkjet recording apparatus 2 Ink cartridge 3 Ink discharge means (inkjet head)
4 Head unit 5 Carriage 6 Drive unit 7 Platen roller 8 Purge device

Claims (6)

A water-based ink for inkjet recording comprising a colorant, water and a wetting agent,
The wetting agent comprises at least one triol selected from the group consisting of 1,2,4-butanetriol, 1,2,5-pentanetriol and 1,2,6-hexanetriol;
The water-based ink further contains raffinose or a derivative thereof,
The amount of the raffinose or a derivative thereof to aqueous ink total amount (R) is, Ri 0.5 wt% to 1 wt% der,
The water-based ink for inkjet recording , wherein the blending amount (T) of the triol with respect to the total amount of the water-based ink and the R satisfy T / R = 25-50 . The water-based ink for inkjet recording according to claim 1, wherein the wetting agent is 1,2,4-butanetriol. The water-based ink for ink jet recording according to claim 1 or 2, wherein the colorant contains a self-dispersing pigment modified with an anionic group. An ink cartridge comprising a water-based ink for ink-jet recording, wherein the water-based ink is the water-based ink for ink-jet recording according to any one of claims 1 to 3. An ink jet recording apparatus that includes an ink container and an ink discharge unit, and discharges the ink stored in the ink container by the ink discharge unit,
An ink jet recording apparatus, wherein the ink containing portion contains the water-based ink for ink jet recording according to any one of claims 1 to 3. An ink jet recording method for recording by ejecting aqueous ink on a recording medium by an ink jet method,
An inkjet recording method comprising using the aqueous inkjet recording ink according to any one of claims 1 to 3 as the aqueous ink.

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