JP2018111291A - Protective liquid and liquid discharge recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective liquid that forms a stable, water-insoluble protective film on the surface of aqueous liquid, to prevent the aqueous liquid from volatilizing.SOLUTION: The present invention provides a protective liquid that is used for a liquid discharge recording device, and forms a water-insoluble protective film on the surface of aqueous liquid 50, to prevent the aqueous liquid from volatilizing. The protective liquid contains: organic liquid 41 containing a repeating unit with 2 or more atoms on its main chain, and having a solubility to 100 g of 25°C water of 1 g or less; and surfactant 42 containing a plurality of the same repeating units as that of the organic liquid.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a protective liquid and a liquid discharge recording apparatus.

  When using a liquid discharge recording apparatus such as an inkjet recording apparatus, volatilization of water from the surface of an aqueous liquid such as an aqueous ink may be a problem. For example, water volatilizes from the surface of the water-based ink at a nozzle opening of a liquid discharge head such as an inkjet head. As a result, the water-based ink is dried and thickened near the nozzle opening, which may cause problems in the discharge of the water-based ink.

  In order to solve this problem, there has been proposed a liquid discharge apparatus including an application unit that applies a protective material that prevents permeation of an aqueous liquid to a nozzle forming surface of a liquid discharge head (Patent Document 1). In this apparatus, liquid paraffin or the like is used as the protective material.

JP 2011-62869 A

  However, conventional protective materials such as liquid paraffin cannot form a stable oil film (protective film) on the surface of the aqueous liquid when applied to the nozzle forming surface, resulting in insufficient prevention of water volatilization. There is.

  Then, an object of this invention is to provide the protective liquid which can prevent volatilization of the said aqueous liquid by forming the stable water-insoluble protective film on the surface of an aqueous liquid.

In order to achieve the above object, the protective liquid of the present invention comprises:
A protective liquid that is used in a liquid discharge recording apparatus and that can prevent volatilization of the aqueous liquid by forming a water-insoluble protective film on the surface of the aqueous liquid,
An organic liquid containing a repeating unit having a main chain atom of 2 or more and having a solubility in 100 g of water at 25 ° C. of 1 g or less;
A surfactant containing two or more of the same repeating units as the organic liquid;
It is characterized by including.

  The protective liquid of the present invention contains an organic liquid having a repeating unit having a main chain atom of 2 or more and having a solubility in 100 g of water at 25 ° C. of 1 g or less, and two or more repeating units identical to the organic liquid. By containing the surfactant, a stable water-insoluble protective film can be formed on the surface of the aqueous liquid, and volatilization of the aqueous liquid can be prevented.

FIG. 1 is a schematic cross-sectional view for explaining an estimation mechanism in which a stable water-insoluble protective film is formed on the surface of an aqueous liquid by the protective liquid of the present invention, and volatilization of the aqueous liquid is prevented. FIG. 2 is a schematic perspective view showing the configuration of an example of the liquid discharge recording apparatus of the present invention. FIG. 3 is a schematic cross-sectional view showing an example of the protective liquid coating means in the liquid discharge recording apparatus of the present invention. FIG. 4 is a schematic cross-sectional view showing an example of how the protective liquid of the present invention is used. FIG. 5 is a schematic cross-sectional view showing another example of usage of the protective liquid of the present invention.

  In the present invention, the “main chain atom” is not particularly limited, and examples thereof include a carbon atom, a sulfur atom, and an oxygen atom.

  In the present invention, “water-insoluble” means, for example, separation into two layers when mixed with an aqueous liquid.

[Embodiment 1]
Embodiment 1 is an example of the protective liquid of the present invention used for preventing volatilization of an aqueous liquid at a nozzle opening of a liquid discharge head. The protective liquid of the present invention includes an organic liquid having a repeating unit having a main chain atom of 2 or more and having a solubility in water at 25 ° C. of 1 g or less, and an interface containing two or more repeating units identical to the organic liquid. And an active agent.

  For example, the protective liquid of the present invention is not an aqueous liquid and preferably contains no water. When the protective liquid of the present invention contains water, for example, it is preferably below the detection limit. Moreover, it is preferable that the protective liquid of this invention does not contain colorants, such as a pigment and dye, for example instead of an ink. When the protective liquid of the present invention contains a colorant, for example, it is an amount that does not substantially become a recording ink.

The repeating unit in the organic liquid includes, for example, an ethylene group ([—CH ₂ —CH ₂ —]), [—CH (CH ₃ ) —CH ₂ —], [—CH () in which the main chain atom is a carbon atom. _{CH 2 CH 3) -CH 2 -} ], [- CH (CH 3) -CH (CH 3) -], [- CH = CH-CH 2 -CH 2 -], [- CH 2 -CH (CH = [—CH ₂ —CH ₂ —O—], wherein the main chain atom is a carbon atom and an oxygen atom, such as (CH ₂ ) —], [—CH (COOR) —CH ₂ —] (R is an alkyl group), _{[-CH 2 -CH 2 -CH 2 -O} -], [- CH (CH 3) -CH 2 -O -], [- CH 2 -CH 2 -CH 2 -CH 2 -O -], [- _{CH (CH 2 CH 3) -CH} 2 -O-] and the like. Examples of the organic liquid include linear alkanes. The linear alkane contains an ethylene group having two carbon atoms as a repeating unit. The number of carbon atoms of the linear alkane is 4 or more, which is essential for forming the linear alkane, and the solubility of the linear alkane in 100 g of water at 25 ° C. is 1 g or less. Although it does not restrict | limit, For example, they are 8-100, 10-70, 12-35. Examples of the linear alkane include liquid paraffin, nonane, decane, undecane, dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, nonadecane, icosane, mineral oil, and the like. Among these, liquid paraffin is particularly preferable from the viewpoint of boiling point and the like.

  The boiling point of the organic liquid is, for example, 150 ° C. or higher, 200 ° C. or higher, or 250 ° C. or higher.

  The said organic liquid may be used individually by 1 type, or may use 2 or more types together. The compounding amount of the organic liquid in the total amount of the protective liquid is, for example, 50% to 99.9% by weight, 70% to 99% by weight, or 80% to 98% by weight.

As described above, the surfactant includes two or more repeating units that are the same as the organic liquid. For example, when the organic liquid contains a linear alkane, examples of the surfactant include sorbitan surfactants, fatty oil surfactants, sorbite surfactants, polysorbents containing two or more ethylene groups. An oxyethylene alkyl ether surfactant or the like can be used. Among these, a sorbitan surfactant and a fatty oil surfactant are preferable because the volatilization preventing effect of the aqueous liquid is further improved. As the surfactant, for example, a commercially available product may be used. Examples of the commercially available products include “Leodol (registered trademark) TW-O106V” (sorbitan surfactant, compound represented by the formula (S1)) and “Emulgen (registered trademark) 103” manufactured by Kao Corporation. (Polyoxyethylene alkyl ether surfactant, compound represented by formula (S2)); “Pegnol (registered trademark) HC-10” manufactured by Toho Chemical Industry Co., Ltd. (fatty oil surfactant, formula ( Compounds represented by S3) and "Sorbon (registered trademark) TR-843" (sorbite surfactant, compound represented by formula (S4)); and the like.

  The surfactant may be used alone or in combination of two or more. The blending amount of the surfactant in the total amount of the protective liquid is, for example, 0.1 wt% to 50 wt%, 1 wt% to 30 wt%, 2 wt% to 20 wt%.

  The surfactant is preferably soluble in the organic liquid because it is more uniformly distributed in the organic liquid.

  Since the concentration reduction of the surfactant in the organic liquid due to diffusion from the organic liquid into the aqueous liquid can be further suppressed, the solubility of the surfactant in 100 g of water at 25 ° C. is It is preferably less than 5 g.

  Since the decrease in the concentration of the surfactant in the organic liquid due to diffusion from the organic liquid into the aqueous liquid can be further suppressed, the number average molecular weight of the surfactant is 500 or more. It is preferable.

  In the protective liquid, the ratio between the organic liquid (O) and the surfactant (S) is not particularly limited. For example, O: S (weight ratio) = 1: 1 to 999: 1, 7: 3 to 99: 1, 4: 1 to 49: 1.

  The protective liquid contains the organic liquid and the surfactant, thereby forming a stable water-insoluble protective film on the surface of the aqueous liquid at the nozzle opening of the liquid discharge head. Volatilization can be prevented. The mechanism for preventing volatilization of the aqueous liquid is estimated as follows, for example. For example, as indicated by an arrow in FIG. 1A, water is volatilized from the surface of the aqueous liquid 50 in the nozzle opening 31 of the liquid discharge head 3 without any treatment, and the aqueous liquid 50 is dried and increased. There is concern about nozzle clogging due to viscosity. Further, as shown in FIG. 1B, when an oil film (protective film) is formed only on the surface of the aqueous liquid 50 with the organic liquid 41 such as liquid paraffin, the affinity between the aqueous liquid 50 and the organic liquid 41 is high. Since it is low, a stable oil film (protective film) cannot always be formed, and the volatilization prevention of the aqueous liquid 50 is not sufficient. On the other hand, according to the protective liquid containing the organic liquid 41 and the surfactant 42, a stable water-insoluble protective film can be formed on the surface of the aqueous liquid 50, and volatilization of the aqueous liquid 50 can be prevented. Presumed to be. However, this mechanism is only an estimation, and the present invention is not limited to this. In FIG. 1, hatching representing a cross section is partly omitted for easy viewing. The same applies to other sectional views. The details of a method for forming a water-insoluble protective film on the surface of the aqueous liquid 50 in the nozzle opening 31 of the liquid discharge head 3 will be described in the second embodiment below.

  The aqueous liquid may be any aqueous liquid as long as it is used for liquid discharge recording, and examples thereof include water-based inks for ink jet recording and processing liquids. Examples of the water-based ink include a general water-based ink containing a colorant such as a pigment and a dye and water. Examples of the treatment liquid include an aqueous liquid containing an aggregating agent that aggregates the colorant contained in the aqueous ink and water.

  The protective liquid may be composed only of the organic liquid and the surfactant, or may contain components other than the organic liquid and the surfactant as long as the effects of the present invention are not impaired.

  The protective liquid can be prepared, for example, by uniformly mixing the organic liquid, the surfactant, and, if necessary, other additive components by a conventionally known method. If necessary, after the mixing, the insoluble matter may be removed using a filter or the like.

  The solubility of the protective solution in 100 g of water at 25 ° C. is not particularly limited, and is, for example, 0 g to 1 g, 0 g to 0.5 g, or 0 g to 0.1 g.

[Embodiment 2]
The second embodiment is an example of the liquid discharge recording apparatus of the present invention using the protective liquid of the first embodiment. FIG. 2 shows a configuration of an example of the liquid discharge recording apparatus of the present invention. As shown in the figure, this liquid discharge recording apparatus is an ink jet recording apparatus 1, which includes four ink cartridges (aqueous liquid container) 2, an ink jet head (liquid discharge head) 3, a head unit 4, and a carriage 5. The drive unit 6, the platen roller 7, and the purge device 8 are included as main components.

  The four ink cartridges 2 contain one color each of four colors of water-based inks of yellow, magenta, cyan, and black. In this example, a set of four ink cartridges 2 is shown, but instead of this, a water-based yellow ink storage unit, a water-based magenta ink storage unit, a water-based cyan ink storage unit, and a water-based black ink storage unit are formed. An integrated ink cartridge whose interior is partitioned may be used. As the ink cartridge, for example, a conventionally known cartridge that is generally commercially available can be used.

  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. 2, 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.

  Although not shown in FIG. 2, the inkjet recording apparatus 1 further includes a protective liquid coating unit. The protective liquid applying means is, for example, in the direction perpendicular to the moving direction of the carriage 5 so that the tip of the wiper member 20 has the same height and can be slid to the location where the wiper member 20 is disposed. It is disposed adjacent to the wiper member 20. As a result, the protective liquid applying means and the wiper member 20 can be switched between when the protective liquid is applied and when the nozzle forming surface of the inkjet head 3 is wiped. The protective liquid applying means is disposed adjacent to the wiper member 20 in a direction parallel to the moving direction of the carriage 5, and the heights of the tips of the protective liquid applying means and the wiper member 20 are changed. It is also possible to switch between the protective liquid applying means and the wiper member 20 when the protective liquid is applied and when the nozzle forming surface of the inkjet head 3 is wiped. As the means for sliding the protective liquid applying means and the wiper member 20 and the means for changing the height, general sliding means and height changing means may be used.

  An example of the protective liquid applying means is shown in the schematic cross-sectional view of FIG. The protective liquid applying means of this example has a configuration in which a sponge 22 that can be impregnated with the protective liquid is attached to the tip of the wiper member 21. By impregnating the sponge 22 with the protective liquid, the protective liquid is applied to the nozzle forming surface of the inkjet head 3 in accordance with the movement of the inkjet head 3 mounted on the carriage 5. A water-insoluble protective film can be formed on the surface of the aqueous liquid at each of the nozzle openings 31a to 31d of the two nozzle rows. The method for supplying the protective liquid to the sponge 22 is not particularly limited. For example, the ink jet recording apparatus 1 may be provided with an automatic supply means or may be supplied manually. Further, the protective liquid applying means is not limited to the example shown in FIG. 3. For example, the protective liquid is applied to the tip of the wiper member by capillarity between two wiper members each having a protective liquid container at the lower end. Any means may be used such as means for supplying, means for supplying the protective liquid from the lower end to the tip of the cylindrical wiper member using a pump.

  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 1, 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 be arranged and fixed in the inkjet recording apparatus 1 without being mounted on the carriage 5. In these embodiments, for example, each cartridge of the four ink cartridges 2 and the head unit 4 mounted on the carriage 5 are connected by a liquid flow path such as a tube, and the head of each of the four ink cartridges 2 is connected to the head. The water-based ink is supplied to the unit 4. In these embodiments, four ink tanks may be used instead of the four ink cartridges 2. In this case, the ink tank is preferably provided with an inlet for injecting ink from the outside to the inside.

  The ink jet recording apparatus 1 is used and stored 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 recording sheet P after recording is discharged from the inkjet recording apparatus 1. When the ink jet recording apparatus 1 is not used for a predetermined period or longer, the protective liquid is applied to the nozzle forming surface of the ink jet head 3 by the protective liquid applying means and stored in that state. When the ink jet recording apparatus 1 is reused, the amount of the protective liquid applied to the nozzle forming surface is very small, so recording may be started as it is, or the protective liquid may be flushed or wiped before the recording starts. You may remove by using. In FIG. 2, the paper feed mechanism and paper discharge mechanism for the recording paper P are not shown.

  The apparatus shown in FIG. 2 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.

[Embodiment 3]
Embodiment 3 is an example of the protective liquid of the present invention used for preventing volatilization of an aqueous liquid in a waste liquid tank of a liquid discharge recording apparatus. The composition, physical properties, preparation method, and the like of the protective liquid of this embodiment are the same as those of the protective liquid of Embodiment 1. In the first and second embodiments, the prevention of volatilization of the aqueous liquid at the nozzle opening of the liquid discharge head has been described. However, the protective liquid of the present invention can also be used for the prevention of volatilization of the aqueous liquid in the waste liquid tank.

  An example of this embodiment is shown in the schematic cross-sectional view of FIG. The protective liquid 40 of the present invention has a stable water-insoluble protective film on the surface of the aqueous liquid 50 collected in the waste liquid tank 60 that constitutes a part of the purge apparatus 8 of the inkjet recording apparatus 1 shown in FIG. By forming, volatilization of the aqueous liquid 50 can be prevented. The method for supplying the protective liquid 40 to the waste liquid tank 60 is not particularly limited. For example, the ink jet recording apparatus 1 may be provided with an automatic supply means or may be supplied manually.

  As shown in FIG. 4, in the waste liquid tank 60, the protective liquid 40 forms a water-insoluble protective film on the upper surface of the aqueous liquid 50. For this reason, in this embodiment, it is preferable that the specific gravity of the protective liquid is smaller than the specific gravity of the aqueous liquid. The specific gravity of the protective liquid in the present embodiment is, for example, 0.7 times to 1.1 times, 0.7 times to 1 time, and 0.7 times to 0.9 times that of the aqueous liquid.

[Embodiment 4]
Embodiment 4 is an example of the protective liquid of the present invention used for preventing volatilization of an aqueous liquid in an ink tank used in a liquid discharge recording apparatus. The composition, physical properties, preparation method, and the like of the protective liquid of this embodiment are the same as those of the protective liquid of Embodiment 1. In the first to third embodiments, the prevention of volatilization of the aqueous liquid in the nozzle opening of the liquid discharge head and the waste liquid tank has been described. is there.

  An example of this embodiment is shown in the schematic cross-sectional view of FIG. As described above, in the ink jet recording apparatus 1 shown in FIG. 2, it is possible to use four ink tanks instead of the four ink cartridges 2. The protective liquid 40 of the present invention can prevent volatilization of the aqueous liquid 50 by, for example, forming a stable water-insoluble protective film on the surface of the aqueous liquid 50 accommodated in these ink tanks 70. The method for supplying the protective liquid 40 to the ink tank 70 is not particularly limited, and may be supplied manually, for example.

  As shown in FIG. 5, in the ink tank 70, the protective liquid 40 forms a water-insoluble protective film on the upper surface of the aqueous liquid 50 as in the waste liquid tank of the third embodiment. For this reason, also in this embodiment, it is preferable that the specific gravity of the protective liquid is smaller than the specific gravity of the aqueous liquid. The specific gravity of the protective liquid in the present embodiment is the same as that in the third embodiment.

  In the first to fourth embodiments, the prevention of volatilization of the aqueous liquid in the nozzle opening of the liquid discharge head, the waste liquid tank, and the ink tank has been described. However, the application of the protective liquid of the present invention is not limited to these examples. The protective liquid of the present invention can be used for any application that requires prevention of volatilization of an aqueous liquid in the use of a liquid discharge recording apparatus.

  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 1-8 and Comparative Examples 1-3]
The protective liquid composition components shown in Table 1 were stirred and mixed to obtain protective liquids of Examples 1 to 8 and Comparative Examples 1 to 3. In the surfactants of Table 1, “same repeating unit” indicates whether or not two or more same repeating units as the organic liquid are included, and “solubility” indicates solubility in 100 g of water at 25 ° C. “Emulgen (registered trademark) A-60” and “Orphine (registered trademark) E1004” represent compounds represented by formulas (CS1) and (CS2), respectively. As for the solubility, when 5 g of the surfactant shown in Table 1 is uniformly dispersed in 100 g of water at 25 ° C., the transparency is 2.5 cm or more when cooled to 0 ° C. and then returned to 25 ° C. again. And the thing in which precipitation was not seen was made into solubility 5g or more, and the said transparency was less than 2.5 cm, or the thing in which precipitation was seen was made less than solubility 5g.

  For the protective liquids of Examples 1 to 8 and Comparative Examples 1 to 3, the spread evaluation on the water-based ink was carried out as follows.

  First, 5 mL of aqueous cyan ink was collected in a wide-mouth bottle (caliber: 20 mm). As the water-based cyan ink, an ink contained in a cartridge LC3029C manufactured by Brother Industries, Ltd. was used. Next, 0.05 mL of the protective liquids of Examples 1 to 8 and Comparative Examples 1 to 3 were dropped on the surface of the water-based cyan ink, the spread was visually observed, and the following evaluation criteria were evaluated. If the result of the spread evaluation on the water-based ink is good, a stable water-insoluble protective film is formed on the surface of the water-based liquid, and the protective liquid is excellent in the volatilization prevention effect of the water-based liquid. I can judge.

Evaluation of spreading on water-based ink Evaluation standard A: The protective liquid diffused on the surface of the water-based cyan ink, and no shrinkage of the diffusion area was observed even after 1 minute from the dropping of the protective liquid.
A-: The protective liquid diffused on the surface of the aqueous cyan ink, but after 1 minute from the dropping of the protective liquid, the diffusion area contracted more than immediately after the dropping.
C: The protective liquid did not diffuse on the surface of the aqueous cyan ink.

  Table 1 shows the protective liquid compositions and evaluation results of the protective liquids of Examples 1 to 8 and Comparative Examples 1 to 3.

  As shown in Table 1, in Examples 1 to 8, the evaluation results of spreading on the water-based ink were good. In Examples 1 and 3 using a fatty oil-based surfactant or a sorbitan-based surfactant having a molecular weight of 500 or more and a solubility in 100 g of water at 25 ° C. of less than 5 g, the molecular weight is about 300, In addition, the evaluation result of the spread on the water-based ink was superior to that of Example 4 in which the same amount of the polyoxyethylene alkyl ether surfactant having a solubility in 100 g of water at 25 ° C. of 5 g or more was used. On the other hand, in Comparative Example 1 in which the surfactant was not used, and in Comparative Examples 2 and 3 in which the surfactant not containing two or more of the same repeating units as the organic liquid was used, the evaluation result of spreading on the water-based ink was It was bad.

  As described above, the protective liquid of the present invention can prevent volatilization of the aqueous liquid by forming a stable water-insoluble protective film on the surface of the aqueous liquid. The application of the protective liquid of the present invention is not particularly limited, and can be widely applied to various liquid discharge recordings.

1 Liquid discharge recording device (inkjet recording device)
2 Aqueous liquid container (ink cartridge)
3 Liquid ejection head (inkjet head)
4 Head unit 5 Carriage 6 Drive unit 7 Platen roller 8 Purge device 21 Wiper member 22 Sponge 31 Nozzle opening 40 Protective liquid 41 Organic liquid 42 Surfactant 50 Aqueous liquid 60 Waste liquid tank 70 Ink tank

Claims (10)

A protective liquid that is used in a liquid discharge recording apparatus and that can prevent volatilization of the aqueous liquid by forming a water-insoluble protective film on the surface of the aqueous liquid,
An organic liquid containing a repeating unit having a main chain atom of 2 or more and having a solubility in 100 g of water at 25 ° C. of 1 g or less;
A surfactant containing two or more of the same repeating units as the organic liquid;
A protective liquid characterized by containing. The protective liquid according to claim 1, which is used for preventing volatilization of the aqueous liquid at a nozzle opening of a liquid discharge head. The protective solution according to claim 1 or 2, wherein the solubility of the surfactant in 100 g of water at 25 ° C is less than 5 g. The protective liquid according to claim 1, wherein the surfactant has a number average molecular weight of 500 or more. The protective liquid according to any one of claims 1 to 4, wherein the organic liquid is a linear alkane. The protective liquid according to claim 5, wherein the surfactant is at least one of a sorbitan surfactant and a fatty oil surfactant. The protective liquid according to claim 1, wherein the organic liquid has a boiling point of 250 ° C. or higher. The protective liquid according to claim 1, wherein the amount of the organic liquid in the total amount of the protective liquid is 80 wt% to 98 wt%. The protective liquid according to claim 1, wherein the aqueous liquid is an aqueous ink or a treatment liquid for inkjet recording. An aqueous liquid container;
A liquid discharge head having a row of a plurality of nozzles for discharging the aqueous liquid stored in the aqueous liquid storage unit;
Protective liquid application means for applying a protective liquid to the nozzle opening of the liquid discharge head;
A liquid discharge recording apparatus comprising:
A liquid discharge recording apparatus, wherein the protective liquid is the protective liquid according to claim 1.

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