JP2002348502A - Ink set for ink jet printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink set for ink jet printing capable of providing a printed material scarcely causing a color bleed and staining a white area and having good ejection stability. SOLUTION: This ink set for ink jet printing is used in ink jet printing of a fabric composed of a polyamide-based fiber and is equipped with four-color dye inks of black, yellow, magenta and cyan. In the ink set, the dye ink of black contains 4-8 wt.% C.I. Acid Black 52 as a coloring agent and the dye ink of yellow contains 4-8 wt.% C. I. Acid Yellow 110 as a coloring agent and the dye ink of magenta contains 2-5 wt.% C. I. Acid Red 289 as a coloring agent and the dye ink of cyan contains 4-8 wt.% C. I. Direct Blue 87 as a coloring agent and the four-color dye inks contain each 0.2-2 wt.% acetylene glycol- based compound as a coloring agent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink set for ink-jet printing of fabrics made of polyamide fibers such as silk, wool, nylon fibers and the like. The present invention relates to an ink set for ink jet textile printing, which is possible and has good ejection stability.

[0002]

2. Description of the Related Art As a method for printing characters and / or images on a woven fabric or a nonwoven fabric made of various fibers, a screen printing method, a roller printing method and the like are generally used. However, these printing methods require complicated operations such as tracing and plate making for each pattern, so that it is difficult to reduce the cost and is not suitable for small-quantity production of other types. In order to eliminate such disadvantages of the conventional printing method, read the pattern sample with an image input device such as a scanner,
A method of performing image processing by a computer and performing printing on the fabric based on the obtained image information by an inkjet recording method (inkjet printing) has been proposed and put into practical use. This ink jet recording method is a recording method in which ink droplets are ejected and the droplets are adhered to a recording material to perform printing. In particular, the ink jet recording method is advantageous in that a high-quality full-color image can be easily obtained. It is widely used in the printing field using paper or the like as a recording material.

[0003] In ink-jet printing, an ink set having four dye inks of black, yellow, magenta and cyan is usually used to provide high image quality.
There has been a demand for the development of an ink set that can provide a high-stability printed material and has excellent ejection stability. In response to this demand, for example, Japanese Patent Application Laid-Open No. 8-259832 proposes an ink set in which a specific acid dye is contained in each of yellow, magenta, and cyan color inks. However, the color print obtained using this type of ink set is a phenomenon in which colors are mixed at different color boundaries,
So-called color bleeding occurred, and the image quality was not satisfactory.

[0004] In addition, usually, the printed fabric obtained by ink-jet printing of the fabric is subjected to a process of washing off unfixed dye with a hot soap solution or the like (soaping process). The dye may adhere to a white background portion of the printed fabric and stain the portion, which may cause so-called white spot contamination.

Accordingly, it is an object of the present invention to provide an ink set for ink-jet printing, which can provide a printed material with very little color bleed and white spot contamination, and has good ejection stability.

[0006]

Means for Solving the Problems The inventors of the present invention have proposed black, yellow,
Inkjet printing was performed using an ink set provided with magenta and cyan dye inks, and various studies were conducted to obtain a printed material. As a result, the colorants contained in these four dye inks were specified. Color bleed and white spot contamination by using acid dyes or direct dyes and adjusting the content thereof to a specific range, and by including a specific amount of an acetylene glycol compound in each of the four color inks. It has been found that it can be suppressed and the ejection stability can be enhanced.

The present invention has been made on the basis of the above findings, and is an ink set which is used for ink-jet printing of a fabric made of a polyamide fiber and includes four color inks of black, yellow, magenta and cyan.
The black dye ink is C.I. I. Acid Black 52 containing 4 to 8% by weight, and the dye ink of yellow contains C.I. I. Acid Yellow 110 containing 4 to 8% by weight, and the magenta dye ink contains C.I. I. Acid Red 289
And the cyan dye ink contains C.I. as a colorant. I. The above-mentioned object is achieved by providing an ink set for inkjet printing containing 4 to 8% by weight of Direct Blue 87 and each of the four color inks containing 0.2 to 2% by weight of an acetylene glycol compound. It has been achieved.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an ink set for ink-jet printing of the present invention (hereinafter, also simply referred to as an ink set).
Will be described. As described above, the ink set of the present invention is an ink set used for inkjet printing of a fabric made of polyamide-based fibers, and includes four color inks of black, yellow, magenta, and cyan.

The black dye ink contains C.I. I. Acid black 52 is contained in an amount of 4 to 8% by weight. The yellow dye ink is C.I.
I. Acid yellow 110 is contained in an amount of 4 to 8% by weight.
The dye ink of magenta contains C.I. I. Acid red 289 is contained in an amount of 2 to 5% by weight. The cyan dye ink is C.I. I. Direct Blue 87 is contained in an amount of 4 to 8% by weight. When the content of the coloring agent in each of the dye inks is less than the lower limit of the above range, the print density is insufficient, and when the content is more than the upper limit of the above range, white spots are easily caused.

The dye ink according to the present invention contains 0.2 to 2% by weight, preferably 0.3 to 1.5% by weight of an acetylene glycol compound. The acetylene glycol-based compound is used as a penetrant, and enhances the wettability of the ink to enhance the ejection stability, and at the same time, enhances the wettability to the pretreated fabric and suppresses color bleeding. If the content is less than 0.2% by weight, the effect of improving the ejection stability is poor, and if it exceeds 2% by weight, the solubility is poor and the viscosity is increased.

As the acetylene glycol compound, a compound represented by the following general formula (I) is preferably used. As commercially available acetylene glycol compounds, Surfynol 82, 440, 465, 485
(All of which are trade names, manufactured by Air Products and Chemicals) are also preferably used.

[0012]

Embedded image

The dye ink according to the present invention preferably contains a humectant from the viewpoint of improving the ejection stability from the nozzles of the recording head of the ink jet printer. Examples of humectants include glycerin, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, polypropylene glycol, 1,3-propanediol, 1,4-butanediol, , 2-hexanediol, 1,5-pentanediol 1,6-hexanediol, 1,2,6-hexanetriol, polyols such as pentaerythritol and derivatives thereof such as ethers and esters; 2-pyrrolidone, N-methyl Lactams such as -2-pyrrolidone and ε-caprolactam; ureas such as urea, thiourea, ethylene urea and 1,3-dimethylimidazolidinone; maltitol, sorbitol, gluconolactone, maltose Include sugars such as, but these one or more may be used. The content of the humectant in the dye ink is preferably 4 to 40% by weight.

Further, the dye ink according to the present invention includes:
From the viewpoint of further increasing the permeability of the ink, a water-soluble organic solvent can be contained as a penetration enhancer. Examples of the water-soluble organic solvent include lower alcohols such as ethanol and propanol; cellosolves such as ethylene glycol monomethyl ether and ethylene glycol monoethyl ether; carbitols such as diethylene glycol monomethyl ether and diethylene glycol monoethyl ether; Glycol ethers such as -n-butyl ether, diethylene glycol-n-butyl ether, and triethylene glycol-n-butyl ether; and the like, and one or more of these are used. The content of the penetration enhancer (water-soluble organic solvent) is preferably 0.5 to 15 in the dye ink.
% By weight.

As described above, the dye ink according to the present invention contains a specific colorant and a specific amount of an acetylene glycol-based compound, respectively, and, if necessary, a humectant, a penetration enhancer (water-soluble). Organic solvent) and water as a balance. As the water, it is preferable to use pure water or ultrapure water such as ion exchange water, ultrafiltration water, reverse osmosis water, and distilled water. In particular, water obtained by sterilizing such water by irradiating with ultraviolet light or adding hydrogen peroxide or the like is preferable because generation of mold and bacteria is prevented for a long period of time.

The dye ink according to the present invention may further contain, if necessary, a fungicide / preservative, an antioxidant / ultraviolet absorber, a chelating agent, an oxygen absorber, a pH adjuster, a dissolution aid, etc. One or more of various additives commonly used in this type of ink can be contained.

The dye ink according to the present invention preferably has a surface tension of 25 to 40 mN / m, and more preferably 28 to 35 mN / m, from the viewpoint of a balance between print quality and reliability as an ink for ink jet recording. It is even more preferred. From the same viewpoint, the viscosity of the dye ink according to the present invention at 20 ° C. is 1.5 to 8 mPa ·
s, more preferably 2 to 6 mPa · s. In order to keep the surface tension and the viscosity within the above ranges, means for adjusting the concentration of the colorant, adjusting the type and amount of the humectant, and the like may be used.

The ink set of the present invention is used for ink-jet printing on a fabric composed of polyamide fibers (silk, wool and nylon fibers). Like the ink set for ordinary ink-jet printing, the ink set is mounted on an ink-jet printer. used. The inkjet printer is not particularly limited, but a drop-on-demand type inkjet printer is preferable. A drop-on-demand type ink jet printer employs a piezoelectric element recording method in which recording is performed using a piezoelectric element disposed in a recording head, and heat energy generated by a heater of a heating resistor element disposed in the recording head. There is a method employing a thermal jet recording method for performing recording by using a method, but any recording method may be employed.

When performing the ink-jet printing on the cloth using the ink set of the present invention, it is preferable to pre-treat the cloth using a pre-treating agent in advance, similarly to the usual ink-jet printing. The pretreatment of the fabric is
This is performed by attaching the pretreatment agent to the fabric using a means such as immersing the fabric in the pretreatment agent, or applying or spraying the pretreatment agent, and then drying the fabric.

As the pre-treatment agent, one containing 0.01 to 20% by weight of a sizing agent such as a water-soluble polymer is used. Examples of the paste include starch substances such as corn and wheat; cellulosic substances such as carboxymethylcellulose and hydroxymethylcellulose; polysaccharides such as sodium alginate, arabic gum, locust bean gum, trant gum, guar gum, and tamarind seeds;
Proteins such as gelatin and casein; tannins; natural water-soluble polymers such as lignin; and synthetic water-soluble polymers such as polyvinyl alcohol compounds, polyethylene oxide compounds, acrylic acid compounds, and maleic anhydride compounds. . If necessary, the pretreatment agent may contain various additives such as humectants such as urea and thiourea, pH adjusters, reduction inhibitors, penetrants, sequestering agents, and defoamers. it can.

In the case of performing ink-jet printing on the cloth using the ink set of the present invention, a dye fixing treatment is performed after printing a character and / or an image on the cloth. As the dye fixing treatment, the same method as in the conventional printing method is used, for example, a normal pressure steam method,
A high-pressure steam method, a thermofix method and the like can be mentioned.
After the dye fixing treatment, the cloth is washed with water and dried as usual. If necessary, a soaping process (a process of washing off unfixed dye with a hot soap solution or the like) may be performed.

[0022]

EXAMPLES The present invention will be described more specifically with reference to examples of the present invention. However, the present invention is not limited to the examples.

[Example] Using the dye ink prepared according to the following <Preparation of dye ink>, the following <Preparation of printed material>
The printed matter was prepared according to the procedures described above, and the degree of color bleed and white spot contamination of the printed matter were evaluated.

<Preparation of Dye Inks> Dye inks of four colors of black, yellow, magenta, and cyan having the compositions shown in Table 1 below were prepared.

[0025]

[Table 1]

<Preparation of Printed Material> An ink jet printer (trade name “PM-900C”, Seiko) was used for three types of fabrics, pre-treated according to the following (pre-treatment of fabrics): Using Epson Co., Ltd., the solid patterns of the single colors of the four dye inks are printed so as to be as close to each other as possible (so that the presence or absence of color bleed can be easily determined visually). Three types of printed fabrics were obtained (Examples 1 to 3).
In addition, no trouble such as nozzle clogging occurred during printing, and stable printing could be performed.

(Pretreatment of Cloth) A pretreatment agent having the composition shown in the following Table 2 was applied to three kinds of cloths of wool cloth, nylon cloth and silk cloth at a pickup rate of 90%, respectively. Dry for 2 minutes.

[0028]

[Table 2]

The printed fabrics of Examples 1 to 3 were subjected to a temperature of 102 ° C. (100 ° C. for nylon fabrics) and a humidity of 100 ° C.
%, And a steaming treatment (dye fixing treatment) was performed in a treatment time of 30 minutes. After the steaming treatment, each printed fabric was sequentially washed with water, soaped, and washed with water, and then dried using an iron to obtain a printed material. The degree of color bleed and white field contamination of each printed material thus obtained was visually observed. As a result, almost no color bleed and white field contamination were observed.

[0030]

According to the ink set for ink jet textile printing of the present invention, it is possible to provide a printed material with extremely little color bleed and white spot contamination. In addition, the ink set for inkjet textile printing of the present invention has good ejection stability,
This is a highly reliable ink set that does not cause nozzle clogging.

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Claims (4)

[Claims] 1. An ink set, which is used for ink-jet printing of a fabric made of a polyamide fiber and includes four dye inks of black, yellow, magenta, and cyan, wherein the black dye ink is C.I. I. Acid Black 52 in an amount of 4 to 8% by weight, and the yellow dye ink contains C.I. I. Acid Yellow 110 in an amount of 4 to 8% by weight, and the magenta dye ink contains C.I. I. Acid red 289 in an amount of 2 to 5% by weight, and the cyan dye ink contains C.I. I. An ink set for inkjet printing containing 4 to 8% by weight of Direct Blue 87 and the dye inks of the four colors each containing 0.2 to 2% by weight of an acetylene glycol compound. 2. The ink set for ink jet textile printing according to claim 1, wherein each of the dye inks contains 4 to 40% by weight of a humectant. 3. A textile printing method using the ink set for ink jet textile printing according to claim 1 or 2, wherein the textile is subjected to ink jet textile printing. 4. A printed material printed by the printing method according to claim 3.