JP2000256974A - Cloth for ink jet, its production and production of printed material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cloth for an ink jet capable of recording a deep high density image and without having a bleeding by forming an ink-receiving layer containing a γ-alumina via a white pigment layer on the cloth and further providing an upper layer containing a thermoplastic resin particles on it. SOLUTION: This cloth for an ink jet is obtained by forming an ink-receiving layer by coating a coating liquid obtained by adding a binder to a γ-alumina dispersion via a lower layer containing a white pigment on the surface of a cloth substrate of a woven or non-woven fabric of a synthetic or natural fiber, then providing an upper layer containing latex particles of a thermoplastic resin selected from a group of polymers of vinyl chloride (vinyl acetate)-based, (vinyl chloride-)acrylic, urethane-based, polyester-based, ethylene-based, vinyl chloride-vinylidene chloride-based, vinylidene-acrylic-based, SBR-based, NBR- based polymer or their copolymers of >=2 components and having 0.1-5 μm mean particle diameter. By imparting ink to the cloth for the ink jet, a printed material is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink-jet fabric which can form a high-quality image on a fabric using an ink-jet recording method, a method for producing the same, and a method for producing a printed material.

[0002]

2. Description of the Related Art Conventionally, screen printing, roller printing, rotary screen printing, transfer printing, and the like have been used as a method for printing an image on a fabric. Because it is difficult to respond quickly,
In recent years, a technique of reading an image with a scanner, performing image processing with a computer, and printing with an ink jet printer has been developed and applied to fabrics.

[0003] However, when ink is adhered to a fabric by an ink jet method, the ink is easily diffused and it is difficult to obtain a delicate image. As a printing technique by the ink jet method, conventionally, ink jet dyeing is performed on a fabric pretreated with an aqueous solution containing a water-soluble polymer substance, a water-soluble salt, and any of water-insoluble inorganic fine particles that is non-dying with respect to a dye to be used. Method (JP-B 63-3)
1594), pretreating the cellulose fiber with an aqueous solution containing an alkaline substance and urea or thiourea and a water-soluble polymer substance, and inkjet dyeing with an ink containing a reactive dye,
A method of performing dry heat fixing treatment (Japanese Patent Publication No. 4-35351) is known. Further, a method of performing ink jet dyeing using a cloth having boehmite particles adsorbing an ink dye adhered to the fiber surface (JP-A-6-184954), an ink jet dyeing method using a cloth having boehmite-based granular alumina and polyethylene oxide resin adhered thereto (Japanese Patent Laid-Open No. 8-127977) is also known.

[0004]

However, when the techniques described in these publications are applied, it is possible to prevent bleeding of an image to some extent and obtain a clear print.
Considering the current demand for high-precision prints that can be controlled with high accuracy and obtain extremely excellent prints in terms of color density, sharpness, and weather resistance,
The fact is that there is room for improvement.

As a result of various studies to solve the above-mentioned problems, the present inventor has found that by applying an ink-receiving layer containing gamma alumina as a main component to a cloth, the color density of an image is high,
It has been found that printing with excellent clarity is possible, and the present invention has been completed. It is an object of the present invention to provide an inkjet fabric which has a high color density of an image, is excellent in clarity, maintains a texture of a fabric, and is excellent in weather resistance, a production method thereof, and a printed material.

[0006]

The ink jet fabric of the present invention is characterized in that the fabric is coated with an ink receiving layer containing γ-alumina.

[0007] The method for producing an ink jet fabric of the present invention comprises the steps of: preparing a coating solution containing γ-alumina; applying the coating solution to the fabric; and coating the fabric after the coating solution is applied. Drying step of drying.

The method for producing a printed material of the present invention is characterized in that an image is formed by applying ink to the ink jet fabric of the present invention.

In the present invention, the ink-receiving layer containing gamma alumina as a main component has an average particle size of 0.01 to 30 μm.
Layer containing porous white pigment as main component (including porous layer)
And an ink-jet fabric constituted by disposing.

Further, according to the present invention, an ink-receiving layer containing gamma alumina as a main component has an average particle diameter of 0.1 to 5 μm.
And ink-jet fabrics provided with a layer (including a porous layer) containing thermoplastic resin particles as a main component. In particular, the ink-jet fabric having the above-described structure forms an image by applying ink to the ink-receiving layer, and then makes the porous layer containing the thermoplastic resin particles non-porous, so that the ozone resistance of the printed material is greatly increased. And the weather resistance can be improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.

As described above, the ink-jet fabric of the present invention is obtained by applying a coating solution obtained by adding a binder to a γ-alumina dispersion to a fabric.

[0013] The γ-alumina used in the present invention is a boehmite or pseudo-boehmite produced by a known method such as hydrolysis of aluminum alkoxide, neutralization of aluminum salt with alkali, hydrolysis of aluminate and the like.
It is manufactured by calcining at 0 to 600 ° C. and can be composed of aluminum oxide fine particles having a γ-type crystal form. The aluminum oxide fine particles having the γ-type crystal form have an average primary particle diameter of 10 to 20 nm, but generally have a secondary aggregation and a particle diameter of about several μm. When the ink receiving layer is formed using γ-alumina having such a large particle diameter, the ink absorption is good, but the transparency of the ink receiving layer is low, the white light is scattered largely, and the color is poor. Become. Therefore, gamma alumina particles forming a large secondary aggregate are ball milled, sand milled,
An average particle size is reduced by a pulverizing means such as an ultrasonic homogenizer, a high-pressure homogenizer, and a nanomizer. As a pulverizing means, a pulverizing method using an ultrasonic homogenizer or a high-pressure homogenizer Nanomizer is preferable. In grinding methods such as ball mills and sand mills,
This is because γ-alumina is a crystal having a high hardness, and foreign matter is mixed by crushing and abrasion of the dispersion medium to cause deterioration of transparency. The adjustment of the average particle diameter of γ-alumina needs to be appropriately selected so as to make use of the texture and gloss of the cloth as the base material. When gloss and transparency are required for the fabric, not only the average particle diameter is reduced to a small value, but also a centrifugal separation method or a filtration method is used in combination (particularly, a ball mill or a sand mill is used as a grinding means). It is necessary to use a gamma alumina dispersion from which large particles have been removed. Conversely, if you do not want to give a glossy look,
It is also possible to use γ-alumina simply by dispersing it without pulverizing it using a pulverizing means.

In order to form the above-ground γ-alumina on a cloth as an ink receiving layer, it is necessary to prepare a coating liquid using a suitable binder and apply the coating liquid to the cloth. The binder that can be used can be freely selected from water-soluble polymers, for example, polyvinyl alcohol and its modified products, starch and its modified products,
Gelatin and its modified products, casein and its modified products, carboxymethylcellulose, cellulose derivatives such as hydroxyethylcellulose, SBR latex,
NBR latex or the like can be used. The mixing ratio of γ-alumina and binder is 30: 1 to 1: 1 on a weight basis.
1, more preferably in the range of 20: 1 to 2: 1.

In order to coat an ink-receiving layer containing gamma alumina as a main component on a cloth, a porous white pigment is dispersed in a suitable solvent together with the above binder, and a blade coater, an air knife coater, a roll coater, a curtain coater is used. A suitable coating method such as a bar coater, a gravure coater, a spray coater, a dip coater or the like can be used. The coating amount of the ink receiving layer containing alumina as a main component is 1 in terms of dry solid content so as to maintain the texture of the fabric.
４０40 g / m ² , more preferably 5-30 g / m ² .

The γ-alumina and the binder may contain a dispersant, a thickener, a pH adjuster, a lubricant, a fluidity modifier, a surfactant, an antifoaming agent, a water-proofing agent, a release agent, a fluorescent enhancer, if necessary. A whitening agent, an ultraviolet absorber, an antioxidant and the like may be added.

The type of the fabric used as the base material of the present invention is not particularly limited, and woven, knitted or non-woven fabrics of synthetic fibers or natural fibers can be used. For example, cotton, silk, hemp,
Nylon, rayon, acetate, polyester and their blended fabrics. The finer the cloth, the smaller the fiber diameter and the finer the cloth, the finer and glossy an image can be formed, and it can be viewed as a reflected image as it is and also as a transmitted image by a backlight. Further, when an image such as an oil painting drawn on a canvas is output by an ink jet recording method, an image utilizing the texture of the base material can be obtained with a cloth having a coarser texture.

The white pigment layer (including porous material) has the effect of strengthening the fabric, and at the same time, has the effect of filling the fiber base, improving the ink absorption, and improving the color development of the ink. As long as it has these basic functions, the white pigment can be used regardless of inorganic or organic. For example,
Examples of the inorganic material include silica, alumina, barium sulfate, titanium oxide, clay, and calcium carbonate. From the viewpoint of whiteness, barium sulfate, silica and alumina are preferred. These white pigments are mixed with a binder and applied to a fabric for use. As a binder,
Polyvinyl alcohol and its modified products, starch and its modified products, gelatin and its modified products, casein and its modified products, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, SBR latex, NBR latex and the like can be used. The mixing ratio of the porous white pigment and the binder is 2 by weight.
It can be arbitrarily selected in the range of 0: 1 to 1: 3, more preferably 10: 1 to 1: 2.

The white pigment layer may be present below the ink receiving layer containing gamma alumina as a main component, that is, at least on one side of the fabric. To coat a white pigment layer on a fabric, a white pigment is dispersed in a suitable solvent together with the binder described above, and a blade coater, an air knife coater, a roll coater, a curtain coater, a bar coater, a gravure coater, a spray coater, a dip coater is used. And other suitable coating methods. The coating amount of the porous white pigments, so as to maintain the texture of the fabric, 1~60g / m ² on a dry solids basis, more preferably from 5 to 40 g / m ^2.

A layer (including a porous layer) containing thermoplastic resin particles having an average particle diameter of 0.1 to 5 μm as a main component is provided as necessary on the upper layer of the ink receiving layer containing γ-alumina as a main component. . Examples of the thermoplastic resin include vinyl chloride, vinyl chloride-vinyl acetate, acrylic, urethane, polyester, ethylene, vinyl chloride-acryl, vinyl chloride-vinylidene chloride, vinylidene chloride-acryl, and SBR. It is preferable to use a latex, which is a latex particle selected from NBR-based materials and copolymer materials of two or more of these materials. When a latex is used as a paint, a material in which these materials are dispersed in an aqueous solution is mainly used, and the solid content thereof is 10 to 5%.
Although 0% by weight is preferable, it can be appropriately adjusted according to the coating method. The coating amount of the latex needs to be such a thickness as to have a function as a protective film, and it is preferable that the coating is usually performed so as to have a thickness of 2 to 10 μm.

In the method for producing a printed material according to the present invention, an ink is applied to an ink-jet fabric using an ink-jet method, and then a porous layer containing a thermoplastic resin, which is the outermost layer, is heated and melted to make it non-porous. The form which does. By making the porous layer containing a thermoplastic resin nonporous, weather resistance such as ozone resistance, water resistance, and light resistance is improved, and printed matter can be stored for a long time. The heating temperature at this time has a relationship with time in consideration of the influence on materials such as the base material, the ink receiving layer and the ink, and the surface properties after nonporous formation.
A range from 0 ° C to 180 ° C is preferred.

[0022]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited thereto.

(Example 1) US Patent Specification No. 42422
No. 71, 4202870, aluminum octoxide was synthesized and then hydrolyzed to prepare an alumina slurry. Water was added to this alumina slurry until the alumina hydrate solid content became 5%. Then 80
After raising the temperature to 5 ° C. and performing an aging reaction for 5 hours, the colloidal sol was spray-dried to obtain an alumina hydrate. When this alumina hydrate was measured by X-ray diffraction, it was pseudo-boehmite. Next, this alumina hydrate powder was further calcined in an electric oven at 500 ° C. for 2 hours to obtain a white powdery aluminum oxide. When this aluminum oxide was measured by X-ray diffraction, it was γ-alumina.

The obtained γ-alumina was added to ion-exchanged water containing acetic acid (1% of acetic acid was added to γ-alumina at a weight ratio) so as to have a concentration of 20% by weight and mixed. Next, this dispersion was pulverized by an ultrasonic disperser for 60 minutes and stirred, and then large particles were removed by a centrifugal separator. A milky gamma alumina dispersion (solid content: 18%)
I got The average particle size of γ-alumina was 180 nm. The average particle diameter was measured with a laser diffraction / scattering particle size distribution analyzer LS230 (trade name, manufactured by Coulter Corporation).

The obtained γ-alumina dispersion and polyvinyl alcohol PVA117 (trade name, manufactured by Kuraray Co., Ltd.) were mixed at a solid content weight ratio of 10: 1, and the total solid content concentration was 15 wt.
% Gamma alumina coating solution was prepared. This coating solution is applied to a polyester woven fabric (100 g / m ^{2 in area} , 7 in both warp and weft).
5d) was applied using a bar coater and dried at 100 ° C. to obtain an inkjet fabric. The coating amount was 20 g / m ² in dry weight.

(Example 2) Precipitable barium sulfate TH (trade name, manufactured by Tsuchiya Kaolin Co., Ltd., average particle size 0.5 to 0.6 μm)
m) was added to and mixed with sodium hexametaphosphate-dissolved ion-exchanged water (5% by weight of sodium hexametaphosphate was added to barium sulfate) to a concentration of 50% by weight. Next, the mixture was pulverized and stirred with an ultrasonic disperser for 10 minutes to obtain a milky-white barium sulfate dispersion. The obtained barium sulfate dispersion and polyvinyl alcohol PVA117 (trade name, manufactured by Kuraray Co., Ltd.) were mixed at a solid content weight ratio of 10: 1 to prepare a barium sulfate coating solution having a total solid content concentration of 40 wt%. This coating solution was applied to a polyester woven fabric (100 g / m ^{2 in area} , 75 in both warp and weft).
d) was applied using a bar coater and dried at 100 ° C. The coating amount was 20 g / m ² in dry weight.

Further, after a porous white pigment layer of barium sulfate was applied to a polyester woven fabric, a gamma alumina coating layer was provided in the same manner as in Example 1 to obtain an ink-jet fabric.

(Example 3) In the same manner as in Example 1, γ was applied to an ink jet printing material IJ2201 (trade name, manufactured by Dynic) in which a silica-based porous white pigment layer was provided on the polyester woven fabric used in Example 1. An inkjet coated fabric was obtained by providing an alumina coating layer.

Example 4 A 10% solids vinyl chloride-vinyl acetate latex (average particle diameter 0.6 μm, Tg: 6) was placed on the ink-jet fabric obtained in Example 3.
0 ° C., MTF: 110 ° C.) with a bar coater,
The ink was dried at 50 ° C. to obtain an ink-jet fabric in which a porous latex layer having a dry coating amount of 10 g / m ² was formed.

(Example 5) Instead of the polyester woven fabric used in Example 2, a vinylon-based woven fabric (having a basis weight of 140 g /
m ² , an ink-jet fabric was prepared in the same manner as in Example 2 except that the warp and the weft were both 140d), and then a porous latex layer was provided in the same manner as in Example 4 to obtain an ink-jet fabric. Was.

Example 6 An ink-jet fabric was prepared in the same manner as in Example 5 except that AKP-G015 (trade name, manufactured by Sumitomo Chemical Co., Ltd.) was used instead of γ-alumina used in Examples 1 to 5. I got

The average particle size of γ-alumina in the dispersion of AKP-G015 was 150 nm.

Comparative Example 1 The woven polyester fabric used in Example 1 was used as it was.

(Comparative Example 2) An ink jet printing material IJ2201 (trade name, manufactured by Dynic Co., Ltd.) in which a silica-based porous white pigment layer was provided on the polyester woven fabric used in Example 1, was used.

Comparative Example 3 The vinylon woven fabric used in Example 5 was used as it was.

In the above Examples 1 to 6 and Comparative Examples 1 to 3, the ink jet color printer BJC-43 was used.
Using 0J (trade name, manufactured by Canon Inc.), the evaluation image was printed to obtain a printed material. In Examples 5 and 6, after printing the evaluation image, the porous latex layer was made nonporous by heating at 120 ° C. for 2 minutes to obtain a printed material.

The following items were visually evaluated for the obtained printed matter. The results are summarized in Table 1.

[0038]

[Table 1]

1) Image clarity:…: no bleeding, no color mixing in the picture,…: no bleeding, slight color mixing in the picture, large amount of ink, Δ: no bleeding, but Some color mixing, ×: Some bleeding is severe, and some colors are mixed in the picture. 2) Color density: ○: Deep color density, Δ:
3) Ozone resistance: ozone weather meter (manufactured by Suga Test Instruments Co., Ltd./ozone concentration 3 ppm, 40 ° C., 50% RH)
The printed material was charged for 2 hours, and compared with the initial printed material. ○…
Color density change of 90% or more, Δ: Color density change of 60 to 90%,
×: Color density change less than 60%

[0040]

As described above, according to the present invention,
A deep high-density image without ink bleeding can be recorded on the fabric. In particular, the inkjet fabric of the present invention provided with a porous latex layer can provide a printed matter having high durability and can be sufficiently used outdoors.

Continuing on the front page (72) Inventor Masanobu Asaoka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kenji Onuma 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. F term (reference) 2C056 EA13 FC06 4H057 AA01 AA02 BA15 CA03 CA19 CA37 CB08 CB38 CB47 CC01 CC02 DA01 DA02 DA34 GA06 HA10 HA15 4J039 FA03 GA24 4L031 AB31 BA09 DA00

Claims (13)

[Claims] 1. An ink-jet fabric comprising a fabric coated with an ink receiving layer containing γ-alumina. 2. The ink jet fabric according to claim 1, further comprising a lower layer containing a white pigment as a lower layer of the ink receiving layer. 3. The ink jet fabric according to claim 1, further comprising an upper layer containing thermoplastic resin particles having an average particle diameter in a range of 0.1 to 5 μm as an upper layer of the ink receiving layer. 4. The ink-jet fabric according to claim 3, wherein the thermoplastic resin particles are latex particles. 5. The latex particle is a vinyl chloride type,
Vinyl chloride-vinyl acetate, acrylic, urethane,
Polyester-based, ethylene-based, vinyl chloride-acrylic, vinyl chloride-vinylidene chloride-based, vinylidene chloride-
The inkjet fabric according to claim 4, wherein the fabric is formed using a material selected from acrylic, SBR, and NBR materials, or a material of a copolymer of two or more of these materials. 6. The ink-jet fabric according to claim 4, wherein the thickness of the upper layer is in a range of 2 to 10 μm. 7. A method for preparing a coating liquid containing γ-alumina, a step of applying the coating liquid to a cloth, and a drying step of drying the cloth after applying the coating liquid. A method for producing an inkjet fabric, characterized by comprising: 8. The method according to claim 7, wherein the coating liquid is obtained by pulverizing and stirring γ-alumina dispersed and contained in the solution. 9. The method for producing an inkjet fabric according to claim 7, wherein the applying step is performed after applying a layer containing a white pigment to the fabric. 10. The method according to claim 7, wherein a layer containing thermoplastic resin particles having an average particle diameter in the range of 0.1 to 5 μm is applied to the cloth after the coating step. Method. 11. The method according to claim 10, wherein the thermoplastic resin particles are latex particles. 12. The coating liquid containing γ-alumina,
Method for producing an ink jet cloth of claim 7 which is coated to be in the range of 1 to 40 g / m ² on a dry solid basis. 13. A method for producing a printed material, wherein an image is formed by applying an ink to the ink-jet fabric according to any one of claims 1 to 3.