JP2003113583A - Cloth for ink jet recording - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cloth for an ink jet recording, especially for a large scale outdoor advertisement such as a suspended curtain, a banner and a sign cloth and excellent in image density, material feeling, bending property and adhesion property. SOLUTION: This cloth for ink jet recording constituted by at least a cloth, binder and binder is characterized by adjusting it to have 3-30 m<2> /g range specific surface area measured by the BET method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording material, and more particularly to a large ink jet recording cloth for outdoor advertisement such as a hanging curtain, a banner and a cloth sign.

[0002]

2. Description of the Related Art In recent years, a large-sized ink jet recording apparatus for a base material such as paper or resin sheet has been developed.
With this device, it is possible to manufacture large-sized advertisements with high density and clear full-color printing, for example, hanging curtains and banners exceeding several meters. However, hanging curtains and banners that use base materials such as paper and resin sheets do not always have good flexibility (prone to wrinkles), and the durability of the base materials is considered when used outdoors. There's a problem.

Therefore, the use of a fiber cloth has attracted attention as an alternative base material. Since the fabric has excellent flexibility and elasticity, it can be stored and transported in a folded state. In addition, it has a different texture (gloss, drape, texture, etc.) from that of paper or resin sheet as a base material,
It is possible to obtain decorative functions such as a solid feeling and a high-class feeling.

However, the cloth has a larger surface irregularity than paper or a resin sheet having a smooth surface, and the colorant particles in the ink are easily diffused, so that the surface density is low. Therefore, when using the inkjet printing method, there is a problem that it is difficult to obtain a clear image as compared with paper or a resin sheet.

Also, from the aspect of ink used in ink jet recording apparatus, conventionally, a water-soluble coloring material such as a direct dye, an acid dye or a reactive dye is mainly dissolved in water, but a hanging curtain or a cloth is used. order to apply to the object such as signboards, ultraviolet, when the ink water-insoluble colorant dispersed in water such as organic pigments having excellent resistance to NO _X gas is used has become much. However, an ink in which such a water-insoluble coloring material is dispersed in water has a drawback that it is difficult to obtain a high-concentration image as compared with a water-soluble coloring material, and it is more difficult to perform inkjet printing on a cloth at a high concentration. I have to.

Recently, there has been developed one in which an ink-receptive layer made of a pigment or a binder is provided on the printing surface of a synthetic fiber cloth so as to have an ink holding power to obtain a high-density image. In particular, the color developability for an ink in which a water-insoluble coloring material is dispersed in water is insufficient, and a product that satisfies the requirements has not been produced yet.

Further, when forming an ink receiving layer composed of such a pigment or binder on a cloth, it is important that the cloth and the pigment or binder applied to the cloth are adhered following the cloth, If the adhesiveness is lacking, the pigment and the binder are easily peeled off from the cloth, which causes problems such as white blur and partial bleeding.

In order to solve these problems, various forms of ink jet recording materials have been proposed. For example, BE of a pigment used for forming an ink receiving layer, etc.
JP-A-09-95042 and JP-A-10-86 disclose that the performance of an inkjet greening agent is improved by controlling the T specific surface area within a certain range.
No. 504 and JP-A No. 2000-233572.

However, all of them are made of paper, resin sheet,
Although it is effective to some extent for a base material having a high smoothness such as a film, it cannot obtain a sufficiently high density image for a base material having severe irregularities such as a cloth. . Furthermore, the texture and flexibility of the cloth and the adhesion between the cloth and the ink receiving layer are not sufficient when used for large outdoor advertisements such as hanging curtains, banners, and cloth signboards. .

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an ink jet recording cloth excellent in the above-mentioned various characteristics (image density, texture, flexibility, adhesiveness). It is provided. In particular, the present invention provides a large-scale outdoor advertising inkjet recording cloth such as a hanging curtain, a banner, and a cloth signboard.

[0011]

The present invention implements the following means in order to solve the above problems. That is, (1) is an ink jet recording cloth in which an ink receiving layer composed of a pigment and a binder is provided on the cloth, and the cloth has a specific surface area of 3 to 30 m according to the BET method.
An ink jet recording cloth characterized by being in the range of ² / g. And (2), the water-swelling rate of the said binder exists in the range of 150% -500%, It exists in the cloth for inkjet recording of (1) characterized by the above-mentioned. Further, (3) the inkjet recording cloth according to (1) or (2), wherein the pigment is amorphous silica having a specific surface area of 300 to 500 m ² / g according to the BET method. Exist. Further, (4), the fabric is a woven fabric composed of yarns made of polyester fiber of 50 to 1000 dtex (1) to
It exists in the inkjet recording cloth of (3). In addition, (5), the ink jet recording according to (1) to (4), characterized in that the smoothness of the surface of the cloth provided with the ink receiving layer according to the JIS-P8119 method is in the range of 0.1 to 20 seconds. Exists in cloth for use. And (6), the inkjet recording cloth of (1)-(5) used as a large outdoor advertisement exists. Further, there is also a method of inkjet recording using the ink of a water-insoluble coloring material dispersed in water on the inkjet recording cloth of (7) and (1). The present invention can adopt a configuration in which two or more selected from the above (1) to (7) are combined as long as it is in line with this object.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. In the present invention, BE of an inkjet recording cloth composed of at least cloth, pigment and binder
It is characterized in that the specific surface area by the T method is adjusted within the range of 3 to 30 m ² / g. We have found that the BE of the pigment
It was considered that simply setting the T specific surface area within a certain range was not sufficient to solve the above-mentioned problems. When the entire ink jet recording cloth provided with a chemical such as a pigment or a binder is regarded as an ink receiver, and the specific surface area of the entire cloth by the BET method is output by the ink jet method (especially, the water-insoluble coloring material is dispersed in water). Image density), the texture of the ink jet recording cloth, the flexibility,
It was found that it is greatly involved in the adhesiveness.

Although the cloth varies depending on the properties of the yarns to be constructed, the weaving and knitting method of the yarns, the density, etc., the fabric is more uneven and has many voids than papers and resin sheets having high smoothness. Therefore, it is a substrate having a large surface area. Chemicals such as pigments and binders adhere along the irregularities and voids of the fabric, so the processed inkjet recording fabric is
The specific surface area is naturally larger than that of smooth materials such as paper and resin sheets. In addition, the numerical value changes depending on the structure and density of the cloth, and it is necessary to accurately control the specific surface area of the entire inkjet recording cloth.

If the BET specific surface area of the ink jet recording cloth is less than 3 m ² / g, the ink holding ability is poor,
The image density is insufficient and a satisfactory image cannot be obtained.
On the other hand, when it is more than 30 m ² / g, there is a problem that the applied chemicals such as pigments and binders are excessive, and the applied chemicals are easily peeled off when bent, and the texture of the cloth is impaired. From the above, BET specific surface area of the inkjet recording cloth in the range of 3~30m ² / g, more preferably it is important to adjust the range of 10 to 20 m ² / g.

As the binder constituting the ink jet recording cloth in the present invention, starch and its derivative, carboxymethyl cellulose, casein, gelatin, polyvinyl alcohol and its derivative, polyvinyl butyral resin, polyethyleneimine resin, polyvinylpyrrolidone resin, poly (Meth) acrylic acid-based resin,
Acrylic ester resin, polyurethane resin, polyamide resin, polyacrylamide resin, polyester resin, urea resin, melamine resin, styrene / butadiene copolymer, methyl methacrylate / butadiene copolymer and ethylene / vinyl acetate copolymer A known material such as an aqueous solution or an aqueous dispersion such as a combination, or a modified polymer obtained by introducing an anionic or cationic residue into the above-mentioned resins can be used alone or in combination as appropriate.

The water swelling ratio of the binder is preferably in the range of 150 to 500%, more preferably 200 to 4
It is preferably in the range of 00%. The water swelling rate is an effective measure to judge the water absorption capacity of the binder,
It can be judged that if the water swelling rate is low, the ink holding ability is poor, and if the water swelling rate is high, the ink holding ability is excellent. However, if the water swelling ratio is more than 500%, the water resistance of the dry film is poor and there is a problem. Of these, polyurethane resins are preferable because they do not impair the texture of the fabric and are highly water-swellable.

The pigment constituting the ink jet recording cloth in the present invention is contained for the purpose of improving the ink holding ability, and specifically, amorphous silica, aluminum silicate, calcium silicate, magnesium silicate. , Inorganic pigments such as alumina, aluminum hydroxide, magnesium hydroxide, calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, smectite, clay, zinc oxide, zinc carbonate and diatomaceous earth, styrene-based, acrylic-based, Examples of the organic pigments include urea resin-based, melamine resin-based, and benzoguanamine-based organic pigments, which can be appropriately used alone or in combination.
Among them, amorphous silica is preferable because it has excellent ink holding ability and is inexpensive.

The BET specific surface area of the pigment is 300 to 500 m.
A range of ² / g is preferred. In order not to impair the flexibility of the cloth, it is desirable to reduce the amount of the chemicals applied to the cloth as much as possible. Therefore, it is necessary to use a pigment having a small particle size, which can have a larger surface area with a small applied amount. If the specific surface area is less than 300 m ² / g, it is necessary to increase the amount of the pigment applied in order to have sufficient ink holding power, and as a result, the pigment is likely to peel off from the cloth. Become. Also, the specific surface area is 500
Pigments larger than m ² / g tend to be brittle, which causes a problem in the strength of the ink receiving layer.

The cloth in the present invention includes all kinds of cloth structures including woven cloth, knitted cloth and non-woven cloth. Also, as the material of the cloth, natural fibers such as cotton, hemp, and wool,
Regenerated fibers such as rayon, semi-synthetic fibers such as acetate and triacetate, synthetic fibers such as polyester, nylon, acryl, polypropylene, polyethylene, etc., and one or more of them may be used in a mixed spinning or interwoven form. . Above all, a polyester woven fabric which is excellent in durability and dimensional stability particularly when used outdoors is preferable.

The fineness of the yarn made of polyester fibers is preferably in the range of 50 to 1000 dtex, and more preferably in the range of 100 to 500 dtex. If a yarn having a fiber diameter of less than 50 dtex is used, the strength that can be used outdoors cannot be maintained. Also, 1000 dt
If it is ex or more, the strength is sufficient, but the flexibility is poor, and the problem that wrinkles are likely to occur during the process of applying the binder or pigment described above tends to occur. The final selection of the fineness largely affects the smoothness of the inkjet recording fabric of the present invention.

As for the smoothness of the surface of the ink jet recording cloth provided with the ink receiving layer, the smoothness measured by JIS-P8119 is preferably 20 seconds or less in order to maintain the texture of the cloth, but it is extremely low. If it is less than 0.1 seconds, a clear image cannot be obtained. Furthermore, since there are many voids in the cloth, the ink may pass through the cloth, strike through the cloth, and stain the printer. As a result, back stain may occur on the cloth during transportation of the printer.

The method for producing the ink jet recording cloth of the present invention is obtained by applying a treatment liquid prepared by kneading the above binder and pigment to the above cloth, and then heat treating at 120 to 180 ° C. The method of applying the cloth to the cloth is not particularly limited, and examples thereof include a coating method, an impregnation method, a laminating method, a screen method, a roller method, a rotary method, and a spray method. Of these, the impregnation method and the coating method are preferable, in which the conditions such as the viscosity and temperature of the treatment liquid to be applied are relatively small, a large amount can be applied, and the application amount can be easily controlled.

In addition to the binder and the pigment, the treatment liquid may further contain a cationic resin, a flame retardant, a light resistance improver, if necessary.
An antioxidant, a viscosity modifier, a cross-linking agent and a pH modifier can be mixed and used.

The cationic resin is used as a mixture with the treatment liquid in order to improve the fixability of the ink in the ink receiving layer.
Specifically, cationic polymer compounds such as polyethyleneimine-based resins, polyacrylic-based resins, polyamine-based resins, polyamide-based resins and polyurethane-based resins can be used alone or in combination as appropriate.

As the flame retardant, a halogen-based flame retardant such as hexabromocyclododecane or tetrabromobisphenol A, a phosphorus-based flame retardant such as tributoxyethyl phosphate or ammonium polyphosphate, and an inorganic flame retardant such as antimony trioxide or zinc chloride. Any conventionally known flame retardant such as a flame retardant, a nitrogen-containing compound flame retardant, and a silicone-based flame retardant can be used.

The ink used in the ink jet recording cloth of the present invention is an ink in which a water-insoluble coloring material such as an organic pigment or an inorganic pigment is dispersed in water or an organic solvent, a reactive dye, an acid dye, a direct dye or a disperse dye. A water-based dye ink in which is dissolved or dispersed, or an ink in which a water-insoluble dye such as a disperse dye or a solvent dye is dissolved in an organic solvent is applicable.

In particular, when an ink in which a water-insoluble ink such as an organic pigment or an inorganic pigment is dispersed in water or an organic solvent is used, such an ink aggregates on the surface of the ink receiving layer and the density and the saturation are lowered. Since it is easy to do and the coloring power is low, it is necessary to apply a large amount of ink, and the effect of the present invention is remarkable.

[0028]

EXAMPLES The present invention will be specifically described below by showing Examples of the present invention, but the present invention is not limited to the following Examples. [Manufacture of Solution for Forming Ink Receiving Layer] As the liquid to be applied to the cloth, mixing and adjustment were performed as shown in Table 1. <Example 1> No. 1 shown in Table 1 The solution of No. 1 was applied to a polyester woven fabric (warp 165 dtex × weft 165 dtex) by a knife coating method, and then at 140 ° C. for 1 hour.
Heat treatment was carried out for a minute to obtain the ink jet recording cloth of the present invention. <Example 2> No. 1 was added to the solution applied to the fabric. An inkjet recording cloth was obtained in the same manner as in Example 1 except that the solution of 2 was used. <Example 3> No. 3 was added to the solution applied to the fabric. An ink jet recording cloth was obtained in the same manner as in Example 1 except that the solution of No. 3 was used. <Comparative Example 1> No. An ink jet recording cloth was obtained in the same manner as in Example 1 except that the solution of No. 4 was used. <Comparative Example 2> No. An inkjet recording cloth was obtained in the same manner as in Example 1 except that the solution of 5 was used. <Comparative Example 3> No. An inkjet recording cloth was obtained in the same manner as in Example 1 except that the solution of 6 was used.

The inkjet recording cloths obtained in Examples and Comparative Examples were evaluated according to the following measurement items. The results are shown in Table 1. [Evaluation items] 1. BET specific surface area The specific surface area of the recording materials obtained in Examples and Comparative Examples is
It means the surface area per 1 g of the recording material and can be measured by the so-called BET method. For this measurement, BELSORP-28SA manufactured by Nippon Bell Co., Ltd. was used, and the measurement sample was subjected to nitrogen pretreatment at 50 ° C. for 24 hours, and then measured.

2. Smoothness The smoothness of the ink receiving layer surface of the recording material is JIS No. P
According to the method of 8119, it was measured with PU-901 manufactured by Tester Sangyo.

3. The adhesiveness between the adhesive cloth and the applied chemical agent is determined according to JIS No. L109
6 With reference to the abrasion strength B method of 6.17, using a Scott type kneading tester, stroke 5 cm, grip 3 cm,
The evaluation was performed under the conditions of a load of 0.5 kg and an amplitude frequency of 100 times. ◯: Almost no chemicals applied from the cloth fall off. Δ: The drug applied from the cloth was slightly dropped off. ×: The chemical applied completely from the cloth fell off.

4. Flexibility The recording materials obtained in Examples and Comparative Examples were bent and evaluated as to whether they remained as wrinkles after that, cracks did not occur at the bent parts, and whether or not there was sufficient flexibility required for processing. ◯: Almost no wrinkles remain even when bent, and there is no cracking. Sufficient flexibility. Δ: Some wrinkles are formed, but no cracking occurs. Does not hinder processing. X: Wrinkle marks remain and cracks also occur. Flexibility that becomes a problem during processing.

5. Texture (gloss, drape, texture,
Etc.) The texture of the obtained recording material was evaluated visually and by touch. ◯: Both gloss and drape are good, and texture is also good. Δ: Although visually indistinguishable, it feels slightly hard when touched. X: Lack of gloss and drape, and hard to touch.

6. Image density An on-demand method in which four color inks (yellow, magenta, cyan, black) in which a water-insoluble coloring material is dispersed in water are used for the recording materials obtained in Examples and Comparative Examples, and ink is ejected by a piezo piezoelectric element. Serial scanning type inkjet recording head (printing conditions: nozzle diameter 100 μm, driving voltage 100 V, frequency 5 kHz, resolution 360 dpi, 4
X4 matrix), and the average amount of ink applied is 1.4 × 10 ^{−2 to} 5.6 × 10 ⁻² μl / m.
Inkjet recording was performed in the range of m ² to obtain a recorded image for evaluation. The color densities of the yellow, magenta, cyan, and black colors of the recorded color pattern were measured visually and using Macbeth RD918. ◯: High density and good color development. Δ: The concentration is slightly low, but it is within the allowable range. X: Significant color failure. 7. The recorded color pattern with the ink bleeding was observed with a microscope to evaluate the degree of dot bleeding. ◯: It has a clean circular shape without bleeding. B: Little bleeding, almost circular. X: Large bleeding and considerably deformed.

[0035]

[Table 1] * Silica A: Mizukasil P740 (Mizusawa Chemical) BET specific surface area 370m ² / g * Silica B: Mizukasil P802 (Mizusawa Chemical) BET specific surface area 250m ² / g * Binder A: Pateracol IJ2 (Dainippon Ink and Chemicals) urethane resin Water-based emulsion Water swelling rate 400% * Binder B: Pateracol IJ100 (Dainippon Ink and Chemicals, Inc.) Urethane resin Water-based emulsion Water swelling rate 110% Water swelling rate of the binder is 100-200 μm, 3
A square dry film of a binder resin having a square cm was prepared, and the dry film was immersed in pure water at room temperature for 24 hours, and the percent increase in the area after that was measured to determine the water swelling rate. For example, when the treated coated film swelled in a 6 cm square, the water swelling rate is 400%. * Cationic resin: Palset JK-173L (Meisei Chemical Industry)

[0036]

According to the present invention, it is possible to provide an ink jet recording cloth excellent in image density, texture, flexibility and adhesiveness when ink jet printing is performed.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D06M 11/79 D06M 101: 32 4L031 15/564 B41J 3/04 101Y 4L033 // D06M 101: 32 D06M 11 / 12 F term (reference) 2C056 EA13 FB03 FC06 2H086 BA15 BA22 BA33 BA41 BA44 BA53 BA55 4D075 CB36 DA03 DB20 DB48 DC38 EA05 EA33 EB07 EB12 EB14 EB19 EB22 CB32 DA01 CB32 DA01 CB35 BE01 CA06 FA02 FA03 GA24 4L031 AA18 AB32 BA20 BA34 4L033 AA07 AB05 AC15 CA50 DA06

Claims (7)

[Claims] 1. A fabric for ink jet recording in which an ink receiving layer composed of a pigment and a binder is provided on the fabric, and the specific surface area by the BET method of the fabric for ink jet recording is in the range of 3 to 30 m ² / g. An inkjet recording cloth characterized by being present. 2. The water swelling ratio of the binder is 150% to 5
The ink jet recording cloth according to claim 1, which is in a range of 00%. 3. The pigment has a specific surface area of 3 by BET method.
Inkjet recording cloth as claimed in any one of claims 1-2, characterized in that the amorphous silica in the range of 00~500m ² / g. 4. The ink jet recording cloth according to any one of claims 1 to 3, wherein the cloth is a woven fabric composed of yarns composed of polyester fibers of 50 to 1000 dtex. 5. The inkjet according to any one of claims 1 to 4, wherein the smoothness of the surface of the cloth provided with the ink receiving layer according to JIS-P8119 method is in the range of 0.1 to 20 seconds. Recording cloth. 6. A claim for use as a large outdoor advertisement.
5. The inkjet recording cloth according to any one of 5 above. 7. A method for inkjet recording using an ink comprising a water-insoluble coloring material dispersed in water on the inkjet recording cloth according to claim 1.