JP4858533B2 - Inkjet printing method - Google Patents

Description

The present invention relates to an aqueous pretreatment agent for inkjet ink for textile printing. The pretreatment agent according to the present invention is used in combination with a printing inkjet ink containing a reactive dye.

Ink jet printing is a method in which small droplets of ink are ejected and adhered to a recording medium such as paper or a transparency film. This method can print a high-resolution and high-quality image at a high speed with a relatively inexpensive apparatus.

Ink-jet printing methods in which this ink-jet printing method is applied to textile printing are various inks that have excellent gradation and multi-color expression, for example, by ejecting ink droplets onto various pre-treated fabrics and adhering the ink. This image can be easily formed on a fabric. Ink jet textile printing is also effective for environmental protection because it generates almost no excess ink that is produced in the conventional printing process.

Various pretreatment agents have been proposed in order to achieve a printing density and sharpness comparable to those of conventional screen printing methods by the inkjet printing method. For example, JP-A-8-127982 (Patent Document 1) discloses a polyethylene oxide resin having a viscosity average molecular weight of 100,000 or more in addition to a paste, urea and an alkali agent, which are basic blending components of a normal pretreatment agent. A water-based pretreatment agent that contains water is described, and it is possible to record a high-density image having a deep and non-bleeding fabric.

JP-A-8-127982

However, the pretreatment agent described in Patent Document 1 is inferior in padding characteristics due to its strong stringiness (stickiness and pulling property) in a wet state, and in particular, a continuous pretreatment operation is performed. It was a drawback. That is, when the above-mentioned pretreatment agent is applied to the fabric with various coaters or padding machines, and the wet-coated fabric is passed between the rollers when transported to the drying process, the spinnability (adhesiveness of the pretreatment agent) The wet coated fabric adheres to the roller surface, resulting in poor peelability, hindering continuous processing, and slowing the passage speed.
Conventionally, in a pretreatment agent used in combination with a printing inkjet ink containing a reactive dye, the fabric does not bleed, it is possible to record a deep high density image, and the spinnability is low, There has not been proposed a pretreatment agent capable of a continuous pretreatment step.
Accordingly, an object of the present invention is an inkjet printing method using a pretreatment agent used in combination with a printing inkjet ink containing a reactive dye, without causing bleeding on the fabric, and improving the color developability. In addition, an object of the present invention is to provide an ink-jet printing method having a low spinnability and capable of a continuous pretreatment process.

According to the present invention, the above-described problem is solved as C.I. I. Reactive Yellow 3, 6, 12, 18, 86, C.I. I. Reactive Orange 2, 5, 12, 13, 20, C.I. I. Reactive Red 3, 4, 7, 12, 13, 15, 16, 24, 29, 31, 32, 33, 43, 45, 46, 58, 59, C.I. I. Reactive Violet 1, 2, C.I. I. Reactive Blue 2, 3, 5, 7, 13, 14, 15, 25, 26, 39, 40, 41, 46, 49, 176, C.I. I. Reactive Green 5, 8, C.I. I. Reactive Brown 1, 2, 7, 8, 9, 11, 14, and C.I. I. An inkjet printing method that male indicia fabric using an inkjet ink containing at least one selected from Reactive Black 1,2,3,8,10,12,13, the indicia捺前, the fabric Solved by an inkjet printing method characterized by using a fabric treated with a pretreatment agent containing at least a polyoxyethylene / polyoxypropylene copolymer, urea, a polyhydric alcohol fatty acid ester, a nitrobenzene sulfonate, and an alkali agent can do.

In a preferred embodiment of the inkjet printing method according to the present invention, a pretreatment agent further containing at least one paste selected from the group consisting of sodium alginate, carboxymethylcellulose, and starch is used as the pretreatment agent for the fabric.
In a preferred embodiment of the ink jet textile printing method according to the present invention, the viscosity average molecular weight of the polyoxyethylene / polyoxypropylene copolymer of the pretreatment agent is 100,000 or less.
In a preferred embodiment of the inkjet printing method according to the present invention, the content of the polyoxyethylene / polyoxypropylene copolymer is 0.1 to 10% by weight.
In a preferred embodiment of the inkjet printing method according to the present invention, the nitrobenzene sulfonate is sodium m-nitrobenzene sulfonate.
In a preferred embodiment of the inkjet printing method according to the present invention, the urea content is 3 to 10% by weight.
In a preferred embodiment of the inkjet printing method according to the present invention, the content of the polyhydric alcohol fatty acid ester is 0.1 to 5% by weight.
In a preferred embodiment of the inkjet printing method according to the present invention, the content of the nitrobenzene sulfonate is 0.1 to 7% by weight.
In a preferred embodiment of the inkjet printing method according to the present invention, the pyrrolidone solvent also contains thioglycol in the inkjet ink for printing.
In a preferred embodiment the ink-jet printing process according to the present invention, the ink containing the anti 応染 fee consists CI Reactive Blue 176 or CI Reactive Red 31.

Since the pretreatment agent in the ink jet printing method according to the present invention contains a polyoxyethylene / polyoxypropylene copolymer, the spinnability is reduced at the same time while maintaining a high printing density. The process becomes possible.

[Pretreatment agent]
(Polyoxyethylene / polyoxypropylene copolymer)
The pretreatment agent in the inkjet printing method of the present invention contains a polyoxyethylene / polyoxypropylene copolymer. The polyoxyethylene / polyoxypropylene copolymer has the formula (1):
HO- [CH2CH2O] m- [CH (CH3) CH2O] n-H (1)
(In the formula, m is an integer of 2 or more, preferably 30 or more, and n is an integer of 2 or more, preferably 30 or more)
It is a high molecular compound represented by these. In the above formula (1), the ethylene oxide repeating unit of [CH2CH2O] and the propylene oxide repeating unit of [CH (CH3) CH2O] are each in the form of a block (for example, AB type or AB- A type) or in a random state. Preferred polyoxyethylene / polyoxypropylene copolymers have the formula (
2):
HO- [CH2CH2O] p- [CH (CH3) CH2O] q- [CH2CH2O] r-
H (2)
(Wherein, p, q, and r are each independently an integer of 2 or more, preferably an integer of 30 or more).

The viscosity average molecular weight of the polyoxyethylene / polyoxypropylene copolymer used in the pretreatment agent in the inkjet textile printing method of the present invention is not particularly limited and can be appropriately determined, but is preferably 100,000 or less, more Preferably it is 80,000 or less, More preferably, it is 40,000 or less. The lower limit of the viscosity average molecular weight of the polyoxyethylene / polyoxypropylene copolymer is not particularly limited, but is preferably 5000 or more, and more preferably 10,000 or more. When the viscosity average molecular weight exceeds 100,000, the spinnability becomes strong and the continuous pretreatment process becomes difficult.
On the other hand, if it is less than 5000, the film-thickness may be lowered.

In the pretreatment agent in the ink jet textile printing method of the present invention, the content of the polyoxyethylene / polyoxypropylene copolymer is not particularly limited and can be appropriately determined, but is 0.1% relative to the total weight of the pretreatment agent. ~
About 10 weight% is preferable, More preferably, it is about 0.5-3 weight%. When the content of the polyoxyethylene / polyoxypropylene copolymer material is less than 0.1% by weight, the effect may be poor, and when it exceeds 10% by weight, the viscosity may be high and difficult to apply.

(Hydrotropy)
The pretreatment agent in the inkjet printing method of the present invention contains a hydrotropic agent. As the hydrotropic agent, for example, urea such as urea, dimethylurea, thiourea, monomethylthiourea, or dimethylthiourea can be used.
Although content of a hydrotropic agent is not specifically limited, Preferably it is 1 to 15 weight% with respect to the total weight of a pretreatment agent, More preferably, it is 3 to 10 weight%. When the content of the hydrotropic agent is less than 1% by weight, the coloring effect may be low, and when it exceeds 15% by weight, the hydrotropic agent powder may float and cause clogging of the head.

(Alkaline agent)
The pretreatment agent in the inkjet printing method of the present invention contains an alkali agent. Preferred examples of the alkali agent include sodium ash, sodium hydroxide, tribasic sodium phosphate, and sodium acetate, and particularly preferred is sodium bicarbonate.
The content of the alkali agent is not particularly limited, but with respect to the total weight of the pretreatment agent,
Preferably it is 1-7 weight%, More preferably, it is 2-5 weight%. Alkaline agent content is 1
If it is less than wt%, the fixing reaction promoting effect may be reduced. If it exceeds 7 wt%,
May damage animal fibers such as silk.

(Glue)
The pretreatment agent in the ink jet textile printing method of the present invention preferably contains a paste. Examples of the paste include natural gums such as guar and locust bean, starches, seaweeds such as sodium alginate and fungi, plant skins such as pectic acid, methyl fibrin, ethyl fibrin, hydroxyethylcellulose, carboxymethylcellulose, etc. Fibrin derivatives, roasted starch, alpha starch, carboxymethyl starch, carboxyethyl starch, hydroxyethyl starch and other modified starches, processed natural gums such as roast bean gum, roast bean gum, algin derivatives, or polyvinyl alcohol, Synthetic pastes such as polyacrylic acid esters, emulsions, etc. are used.
More than one species can be used in combination.
As the paste, it is preferable to use one or more of sodium alginate, carboxymethylcellulose, or starch in combination.
The content of the paste is not particularly limited, but is preferably 0.1 to 5% by weight, more preferably 0.3 to 2% by weight, based on the total weight of the pretreatment agent. The paste content is 0.1
If it is less than% by weight, the effect of preventing bleeding may be reduced, and if it exceeds 5% by weight, it may become highly viscous and coating may be difficult.

(Leveling agent)
The pretreatment agent in the inkjet printing method of the present invention preferably contains a leveling agent. As the leveling agent, for example, polyhydric alcohol fatty acid ester, glycerin fatty acid ester, sorbitan fatty acid ester, or pentaerythritol fatty acid ester can be used. Polyhydric alcohol fatty acid ester [for example, commercially available from Nikka Chemical Co., Ltd. It is preferable to use the used sunflorene].
The leveling agent content is appropriately determined depending on the amount and type of the dye in the ink and is not particularly limited, but the leveling agent content is based on the total weight of the pretreatment agent. Preferably 0.1
5% by weight, more preferably 0.3-2% by weight. When the leveling agent content is less than 0.1% by weight, the coloring effect may be reduced, and when it exceeds 5% by weight, bleeding may occur.

(Reduction inhibitor)
As the reduction inhibitor, nitrobenzene sulfonate is preferably used, and metanitrobenzene sulfonate is more preferably used. The salt is, for example, an alkali metal salt, preferably a sodium salt.
The content of the reduction inhibitor is not particularly limited, but with respect to the total weight of the pretreatment agent,
Preferably it is 0.1 to 7 weight%, More preferably, it is 1 to 5 weight%. When the content of the anti-reducing agent is less than 0.1% by weight, the dyeing and coloring after steaming may become unstable, and even when the content exceeds 5% by weight, the color stabilizing effect does not change any more. The effect of adding a reduction inhibitor to the pretreatment liquid is that C.I. I. This is particularly effective when reactive blue 176 is included.

(water)
In the pretreatment agent in the inkjet printing method of the present invention, water is the main solvent. As the water, pure water such as ion exchange water, ultrafiltration water, reverse osmosis water, or distilled water, or ultrapure water can be used. In addition, use of water sterilized by ultraviolet irradiation or addition of hydrogen peroxide is preferable because generation of mold and bacteria can be prevented when the pretreatment agent is stored for a long period of time.

(Other additives)
In order to improve color development, silica and / or alumina can be added in addition to the above-described components.

[Inkjet ink for textile printing]
(dye)
The pretreatment agent in the inkjet printing method of the present invention is used in combination with a printing inkjet ink containing a reactive dye. The reactive dye contained in the inkjet ink for printing used in combination with the pretreatment agent in the inkjet printing method of the present invention is not particularly limited as long as it has the property of being chemically bonded and fixed to the fabric by heat vapor deposition. A dye having an azinyl group, a dichlorotriazinyl group, a chloropyrimidyl group, a vinylsulfone group, an alkylsulfuric group or the like as a reactive group is preferable. These dyes are selected according to individual purposes. For example, when a high concentration of black is particularly desired, a vinylsulfone reactive dye is suitable. In addition, when it is necessary to store inkjet ink for textile printing for a long time, a monochlorotriazinyl skeleton, that is, monochloro substitution 1,3
A dye having a 5-triazin-2-yl skeleton is preferred. Reactive dyes having a monochlorotriazinyl skeleton are particularly suitable as ink-jet ink dyes that require long-term storage stability because they are relatively excellent in thermal stability. Specific examples of the reactive dye contained in the inkjet ink for textile printing are listed below.
C. I. Reactive Yellow 3, 6, 12, 18, 86
C. I. Reactive Orange 2, 5, 12, 13, 20,
C. I. Reactive Red 3, 4, 7, 12, 13, 15, 16, 24, 29, 31,
32, 33, 43, 45, 46, 58, 59,
C. I. Reactive violet 1, 2,
C. I. Reactive Blue 2, 3, 5, 7, 13, 14, 15, 25, 26, 39, 4
0, 41, 46, 49, 176
C. I. Reactive Green 5, 8,
C. I. Reactive Brown 1, 2, 7, 8, 9, 11, 14, and C.I. I. Reactive Black 1, 2, 3, 8, 10, 12, 13
In the present specification, the reactive dye refers to a compound classified as a reactive dye in the color index.

In the inkjet ink for textile printing used in combination with the pretreatment agent in the inkjet textile printing method of the present invention, the content of the reactive dye is not particularly limited and can be appropriately determined, but is 1 to 15% by weight based on the total weight of the ink. The degree is preferable, more preferably about 6 to 12% by weight. If the reactive dye content is less than 6% by weight, a sufficient printing density cannot be obtained, and if it exceeds 15% by weight, the ejection stability required for ink jet inks deteriorates, particularly at high temperatures. May be defective. In addition, when it is particularly desired to obtain printing gradation, by adding a light-colored ink having a dye concentration of 6% by weight or less in addition to the above-mentioned ink, medium to low density gradation can be improved.

(Buffering agent)
In the inkjet ink for printing used in combination with the pretreatment agent in the inkjet printing method of the present invention, it is desirable to stabilize the pH by adding a buffer. Moreover, the hydrolysis of the reactive dye in the ink liquid can be delayed by adjusting the pH to 9 or less. The progress of hydrolysis not only lowers the fixing density of the fabric, but also advances the ink to a strongly acidic region, which tends to corrode the printing press. In particular, the corrosion of the print head portion causes great damage to the inkjet system. The preferred pH of the inkjet ink for textile printing used in combination with the pretreatment agent of the present invention is 6 to
9, more preferably 7 to 8.5. If the pH is too high, hydrolysis of the reactive dye tends to proceed. For example, when it is necessary to leave at 30 ° C. for 1 year or longer, the pH is preferably 9 or less. However, when the ink is used up in a short period of time, the pH of the ink may exceed 10.

These pHs can be adjusted using a buffer. Examples of these buffering agents include 2-hydroxy-3-monoforinopropanesulfonic acid and N-cyclohexyl-3.
-Aminopropanesulfonic acid (CAPS), N-cyclohexyl-2-aminoethanesulfonic acid, 2- [4- (2-hydroxyethyl) -1-piperazinyl] ethanesulfonic acid,
Mention may be made of sodium or potassium salts such as N, N-Bis- (2-hydroxyethyl) glycine, phosphoric acid or tripolyphosphoric acid. In the inkjet ink for printing used in combination with the pretreatment agent in the inkjet printing method of the present invention, it is preferable to use a phosphate buffer as the buffer.

(water)
In the ink jet printing ink used in combination with the pretreatment agent in the ink jet textile printing method of the present invention, any water can be used as water, but pure water is preferably used. Pure water can be easily produced by ion exchange or distillation. Further, it is more preferable that the pure water is further sterilized with ultraviolet rays or the like.

(Reduction inhibitor)
The ink jet textile ink used in combination with the pretreatment agent in the ink jet textile printing method of the present invention can contain a reduction inhibitor. As the reduction inhibitor, nitrobenzene sulfonate is preferably used, and metanitrobenzene sulfonate is more preferably used. The salt is, for example, an alkali metal salt, preferably a sodium salt. In addition, this effect is added to the dye in the ink.
. I. When reactive blue 176 is included, the effect is particularly great.

(Metal sequestering agent)
Furthermore, the ink jet textile ink used in combination with the pretreatment agent in the ink jet textile printing method of the present invention may contain a sequestering agent. As a sequestering agent, ethylenediaminetetraacetic acid (E
DTA), EDTA salt (for example, sodium salt), hydroxyethylethylenediaminetriacetic acid (EDTA-OH) and the like are suitable.

(Other additives)
Ink jet textile ink used in combination with the pretreatment agent in the ink jet textile printing method of the present invention has an alkylene glycol monoalkyl ether (for example, for the purpose of improving ink ejection stability (particularly, ejection stability with a piezo head)). , Triethylene glycol mono-n-butyl ether).
In addition, the ink- jet printing ink used in combination with the pretreatment agent in the ink-jet printing method of the present invention preferably contains a preservative in addition to the above components. Preferable antiseptics include, for example, proxel CRL, proxel BDN, proxel GXL, proxel XL-2, proxel IB, or proxel TN.
Furthermore, the textile printing ink contains a pyrrolidone solvent (for example, 2-pyrrolidone, N-methyl-
By containing 2-pyrrolidone) or thioglycol, the solubility of the dye can be increased, and excellent ejection stability can be imparted to high-concentration dye inks.

Furthermore, the ink- jet printing ink used in combination with the pretreatment agent in the ink-jet printing method of the present invention contains the above-mentioned constituents as appropriate, but has a viscosity of 8.0 m · Pa · s or less at 20 ° C., preferably 1 0.5 to 6.0 m · Pa · s is preferable. If it is 8.0 m · Pa · s or less, ink can be ejected at normal ambient temperature without any problem. Ink exceeding 8.0 m · Pa · s at 20 ° C. has poor ejection stability in a low temperature region.

[Inkjet printing method]
The ink jet textile printing method according to the present invention is mainly composed of a process in which an ink jet textile ink is ejected and adhered by an ink jet method to a fabric pretreated with the pretreatment agent of the present invention, a fixing process, and a washing process. Is done. Each process includes
Known methods and procedures can be used. Hereinafter, specific modes of each step will be exemplified.
(Pre-processing method)
As a method for attaching the pretreatment agent to the fabric in the ink jet textile printing method according to the present invention, a coating or padding method is desirable as usual. For example, the pick-up rate at the time of padding can be appropriately determined by the thickness of the fabric, the thickness of the fiber, etc., and is preferably 50% or more, and more preferably 65% or more.

(Fabric)
The fabric that can be printed by the method of the present invention is a fabric composed of vegetable fiber, animal fiber, amide fiber, or a blend composed of at least one of these fibers. A fabric made of cellulosic fiber or amide fiber is preferable. Preferably used are fabrics made of fibers such as cotton, hemp, wool, silk, viscose rayon, cupra rayon, polynosic, vinylon or nylon.

(Fixing)
The fabric treated with the pretreatment agent is printed with the printing ink by an ink jet method and then fixed with high heat or high heat steam. As the fixing condition, for example, in the case of a cellulosic fabric, it is preferable to treat at 95 to 105 ° C. near saturated steam for 4 to 12 minutes. In addition, in amide fibers such as silk and wool, at 95 to 105 ° C., near saturated steam,
It is preferable to process for 20 to 40 minutes.

(Discharge head)
The ink-jet printing method can be applied to any ink-jet method such as a thermal method, a continuous method, or a piezo method, but is preferably a piezo vibrator method.

When filling the inkjet ink for printing into a piezo vibrator type inkjet print head and discharging it, it is desirable that the surface layer of the nozzle plate of the print head is subjected to an ink repellent treatment. By applying the ink repellent treatment, it is difficult for the ink to be bent, and a desired image with excellent reproducibility can be printed on the fabric. This flight bending prevention effect can be remarkably improved by adding 1,2-hexanediol to the textile printing ink.

The ink repellent treatment is also preferably performed on the inner surface of the nozzle hole. By applying to the inner surface, the ink meniscus position is stabilized, and the ejection stability is further improved. Moreover, it becomes difficult for ink to come out on the nozzle plate surface, and the ink repellency on the nozzle surface can be maintained for a longer time.

The nozzle plate can be provided with holes having a desired diameter. Examples of the constituent material of the nozzle plate include metals, ceramics, silicon, glass, plastics, etc., preferably a single material such as titanium, chromium, iron, cobalt, nickel, copper, zinc, tin, or gold. Or alloys such as nickel-phosphorus alloy, tin-copper-phosphorus alloy, copper-zinc alloy, stainless steel, polycarbonate, polysulfone, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, polysulfone, or various photosensitive materials. It is desirable that it is made of a functional resin.

The method for ink repellent treatment of the surface of these materials is not particularly limited. For example, the surface of the material is immersed in an electrolytic solution in which nickel ions and water-repellent polymer resin particles are dispersed by electric charge, and the electrolytic solution is immersed while stirring. A method of eutectoid plating on the surface of the nozzle plate is preferred. As the water-repellent polymer resin material used for this eutectoid plating, resins such as polytetrafluoroethylene, polyperfluoroalkoxybutadiene, polyfluorovinylidene, polyfluorovinyl, or polydiperfluoroalkyl fumarate are used alone or in combination. It is suitable to use. The metal material need not be limited to nickel, such as copper, silver, tin,
Or zinc etc. can be selected suitably. Preferably, a material having a large surface hardness and excellent wear resistance, such as nickel, a nickel-cobalt alloy, or a nickel-boron alloy, is suitable.

EXAMPLES Hereinafter, the present invention will be specifically described by way of examples, but these do not limit the scope of the present invention.

<Examples 1-2 and Comparative Examples 1-3 : Preparation of pretreatment agent>
Pretreatment agents of Examples 1 to 3 and Comparative Examples 1 and 2 having the compositions shown in Table 1 were prepared. In Table 1, the unit of numerical values is% by weight, and the EOPO copolymer is a polyoxyethylene / polyoxypropylene copolymer (viscosity average molecular weight = 15,500; Pluronic F108; Asahi Denka Kogyo Co., Ltd.). The dye is a polyvalent fatty acid ester (Sunfloren SN; Nikka Chemical Co., Ltd.)
It is.

<Physical property evaluation>
(1) Padding Padding Example 1 pretreatment agent prepared in 2 and Comparative Examples 1 to 3 was carried out under 60 ° C. using a padder (Mathis Co. HVF350). The fabric previously cut into 210 × 315 mm was padded under the conditions of a pressure of 2 bar, a speed of 2 to 3 m / min, and a drawing rate of about 70%.
The padded fabric was cotton broad. In addition, when taking out the padded cloth from the padder, no string was observed and excellent padding characteristics were shown.

(2) Inkjet printing An inkjet ink A for printing having the composition shown in Table 2 below was prepared. In Table 2, the unit of numerical values is% by weight, and RR31 is C.I. I. Reactive Red 31
The phosphate buffer is tripolyphosphate, and Surfynol E1010 is an acetylene glycol surfactant. The ink A is converted into an inkjet printer (MJ8000C;
Inkjet printing was performed on the cotton padded in Seiko Epson Corporation and padded in (1) above.

(3) Post-treatment The cotton treated in the previous item (2) was fixed using a steamer (DHe type; Matisse). Fixing was performed at 102 ° C. for 8 minutes under a condition near saturated vapor pressure.
Washing was performed after the steam heat treatment. That is, cloth was washed with tap water and warm water was gradually added. Then, it was immersed in boiling water containing an anionic activator for 15 minutes with occasional stirring. Furthermore, it was hand-washed while putting tap water in the cleaning solution. The washed cloth was ironed to obtain a printed cloth.

(4) OD measurement The OD value was measured with a colorimeter (Gretag Macbeth SPM50). The results are shown in Table 1.
As is clear from the comparison between Example 2 and Comparative Example 1 in Table 1 or the comparison between Comparative Example 3 and Comparative Example 2, as reactive dyes , C.I. I. Reactive Yellow 3, 6, 12, 18, 86, C.I. I. Reactive Orange 2, 5, 12, 13, 20, C.I. I. Reactive Red 3, 4, 7, 12, 13, 15, 16, 24, 29, 31, 32, 33, 43, 45, 46, 58, 59, C.I. I. Reactive Violet 1, 2, C.I. I. Reactive Blue 2, 3, 5, 7, 13, 14, 15, 25, 26, 39, 40, 41, 46, 49, 176, C.I. I. Reactive Green 5, 8, C.I. I. Reactive Brown 1, 2, 7, 8, 9, 11, 14, and C.I. I. An inkjet printing method that male indicia fabric using an inkjet ink containing at least one selected from Reactive Black 1,2,3,8,10,12,13, the indicia捺前, the fabric In a printing method using a fabric treated with a pretreatment agent containing at least a polyoxyethylene / polyoxypropylene copolymer, urea, a polyhydric alcohol fatty acid ester, a nitrobenzene sulfonate, and an alkali agent, the printing density is improved. Was observed.

The pretreatment agent in the inkjet printing method of the present invention can be used in combination with a printing inkjet ink containing a reactive dye.

Claims (10)

As reactive dye ,
C. I. Reactive Yellow 3, 6, 12, 18, 86,
C. I. Reactive Orange 2, 5, 12, 13, 20,
C. I. Reactive Red 3, 4, 7, 12, 13, 15, 16, 24, 29, 31, 32, 33, 43, 45, 46, 58, 59,
C. I. Reactive violet 1, 2,
C. I. Reactive Blue 2, 3, 5, 7, 13, 14, 15, 25, 26, 39, 40, 41, 46, 49, 176,
C. I. Reactive Green 5, 8,
C. I. Reactive Brown 1, 2, 7, 8, 9, 11, 14, and
C. I. Reactive Black 1, 2, 3, 8, 10, 12, 13
An inkjet printing method that male indicia fabric using an inkjet ink containing at least one selected from the indicia捺前, the fabric, at least a polyoxyethylene / polyoxypropylene copolymer, urea, multi An ink-jet printing method comprising using a fabric treated with a pretreatment agent containing a monohydric alcohol fatty acid ester, a nitrobenzene sulfonate, and an alkali agent.   The inkjet printing method according to claim 1, wherein the pretreatment agent further comprises at least one paste selected from the group consisting of sodium alginate, carboxymethylcellulose, and starch.   The inkjet printing method according to claim 1 or 2, wherein the polyoxyethylene / polyoxypropylene copolymer of the pretreatment agent has a viscosity average molecular weight of 100,000 or less. The inkjet printing method according to any one of claims 1 to 3, wherein a content of the polyoxyethylene / polyoxypropylene copolymer is 0.1 to 10% by weight.   The inkjet printing method according to any one of claims 1 to 4, wherein the nitrobenzenesulfonate is sodium m-nitrobenzenesulfonate.   The inkjet printing method according to any one of claims 1 to 5, wherein the urea content is 3 to 10% by weight. The inkjet printing method according to any one of claims 1 to 6, wherein the content of the polyhydric alcohol fatty acid ester is 0.1 to 5% by weight. The inkjet printing method according to any one of claims 1 to 7, wherein a content of the nitrobenzene sulfonate is 0.1 to 7% by weight.   The inkjet printing method according to any one of claims 1 to 9, wherein the inkjet ink for textile printing contains a pyrrolidone-based solvent also thioglycol. The ink containing the anti 応染 fee consists CI Reactive Blue 176 or CI Reactive Red 31, ink-jet printing process according to any one of claims 1-9.