Aqueous adhesive composition, belt for fabric conveyance, inkjet printer, and preparation method for aqueous adhesive composition

Abstract

To provide an aqueous adhesive composition which is excellent in fabric conveyance, and achieves reduction in environmental loads and improvement of working environment.SOLUTION: An aqueous adhesive composition for forming an adhesive layer in a belt for fabric conveyance of an inkjet printer contains an acrylic resin, and has adhesive force of the adhesive layer formed of the aqueous adhesive composition of 0.1 N / 25 mm or more and 10 N / 25 mm or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an aqueous adhesive composition, a fabric transport belt, an ink-jet printing device, and a method for preparing the aqueous adhesive composition. [Background technology]

[0002] Inkjet recording methods are capable of recording high-definition images with a relatively simple device, and have been rapidly developed in various fields. In the process, various studies have been conducted on ejection stability, etc. For example, Patent Document 1 discloses, as a textile printing technique using an inkjet method, a conveying device and an image recording device that are provided with a displacement suppressing member for a conveying member, for the purpose of stabilizing the contact state between a removing member and a conveying member and improving the recovery performance of cleaning water by the removing member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-109036 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the textile printing technique using the inkjet method, a cloth is attached to a transport member (such as an endless belt) and transported to a printing section. An adhesive (adhesive) is applied to the surface of the transport member, and the surface of the transport member is adhesive. After printing, the cloth is peeled off from the transport member and transported to the next process. On the other hand, since the cloth is to be attached again to the transport member after the cloth is peeled off, it is preferable to remove ink, lint, and other remaining materials that have adhered to the transport member during the printing process. Usually, the ink, lint, and other remaining materials that have adhered to the transport member are washed with water. In that case, a cleaning member such as a brush or sponge that comes into contact with the transport member to clean it may be used. Usually, the adhesive's adhesiveness is maintained after a certain number of water washes, and there is no need to apply new adhesive each time the wash is performed.

[0005] Regarding adhesives, Patent Document 1 states that "the type of adhesive that imparts adhesiveness to the conveying member 1 is not particularly limited, and examples include rubber-based adhesives with natural rubber or synthetic rubber as the main component, acrylic-based adhesives, silicone-based adhesives, etc." In inkjet printing, the adhesive used generally has a hydrophobic resin dissolved in an organic solvent so that the adhesive surface can maintain a certain level of adhesive strength even if it is repeatedly washed with water. However, in order to reduce the environmental load and improve the working environment, there is a demand for water-based adhesives that use less organic solvent. On the other hand, water-based adhesives do not have sufficient transportability for fabrics (transportability means that the fabric can be transported by a belt and the transported fabric can be easily peeled off).

[0006] There is a demand for a water-based adhesive that contains an acrylic resin and has a specified adhesive strength, is excellent in terms of fabric transportability, reduces the environmental load, and improves the working environment. [Means for solving the problem]

[0007] The aqueous adhesive composition of the present invention is an aqueous adhesive composition for forming an adhesive layer on a fabric transport belt of an inkjet printing device, the aqueous adhesive composition containing an acrylic resin, and the adhesive strength of the adhesive layer formed from the aqueous adhesive composition is 0.1 N / 25 mm or more and 10 N / 25 mm or less.

[0008] The fabric transport belt of the ink-jet printing apparatus of the present invention has an adhesive layer derived from the aqueous adhesive composition of the present invention on its surface.

[0009] The inkjet printing apparatus of the present invention has a transport mechanism which transports a fabric by laminating the fabric to an adhesive layer made of the aqueous adhesive composition of the present invention formed on the surface of a fabric transport belt, a recording section which performs textile printing recording on the fabric laminated to the adhesive layer using an inkjet head, and a cleaning section which cleans the adhesive layer from which the fabric has been peeled off after the textile printing recording.

[0010] The method for preparing the aqueous adhesive composition of the present invention is a method for producing the aqueous pressure-sensitive adhesive composition of the present invention, which includes a mixing step of mixing a first solution containing an acrylic resin emulsion with a second solution containing an acrylic resin emulsion, and the adhesive strength of an adhesive layer formed from the first solution is higher than the adhesive strength of an adhesive layer formed from the second solution. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic cross-sectional view of an ink-jet textile printing apparatus. [Diagram 2] Data from the examples are shown below. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings as necessary, but the present invention is not limited to this, and various modifications are possible without departing from the gist of the present invention. In the drawings, the same elements are given the same reference numerals, and duplicated explanations will be omitted. Furthermore, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings, unless otherwise specified. Furthermore, the dimensional ratios of the drawings are not limited to those shown in the drawings.

[0013] 1. Water-based adhesive composition The aqueous adhesive composition of this embodiment is an aqueous adhesive composition for forming an adhesive layer on a fabric transport belt of an inkjet printing device, and contains an acrylic resin. The adhesive strength of the adhesive layer formed by the aqueous adhesive composition is 0.1 N / 25 mm or more and 10 N / 25 mm or less.

[0014] In a conventional inkjet printing device, an adhesive layer is formed on a transport member such as an endless belt, and a fabric serving as a recording medium is attached to the adhesive layer. The fabric is then transported to a printing unit, where recording is performed, and the transport member and the fabric are then peeled off.

[0015] Conventionally, solvent-based acrylic adhesives have been widely used as adhesives for such fabric transport members. However, when applying solvent-based acrylic adhesives, organic solvents evaporate, which may have adverse effects on the human body in the working environment. In addition, when using solvent-based acrylic adhesives, an exhaust device must be installed in the environment in which the inkjet printing device is used, which makes the overall device configuration large and expensive.

[0016] Another problem is that in order to apply an adhesive to the fabric transport member of the inkjet printing device to form an adhesive layer and transport the fabric by adhering it to the adhesive layer, the adhesive is required to have appropriate adhesive strength for adhering and peeling the fabric, and to have excellent transport properties for the fabric or sheet.

[0017] In response to the above problems, the aqueous pressure-sensitive adhesive composition of the present embodiment, by including the above-mentioned components, is excellent in fabric transportability, and can reduce the environmental load and improve the working environment. Each component contained in the aqueous pressure-sensitive adhesive composition will be described in detail below.

[0018] 1.1. Adhesive strength The adhesive layer formed from the aqueous adhesive composition has an adhesive strength of 0.1 N / 25 mm or more and 10 N / 25 mm or less. The adhesive strength of 0.1 N / 25 mm or more allows the fabric to be transported well. If the adhesive strength is less than 0.1 N / 25 mm, the fabric may float from the belt in some places, resulting in the fabric not being uniformly flat and causing uneven printing. From the above viewpoint, the adhesive strength is preferably 0.1 N / 25 mm or more, 1.0 N / 25 mm or more, or 3.0 N / 25 mm or more. By having an adhesive strength of 10 N / 25 mm or less, the transported fabric can be easily peeled off from the belt without the fabric stretching or tearing. From the above viewpoint, the adhesive strength is preferably 9.5 N / 25 mm or less, and more preferably 9.0 N / 25 mm or less.

[0019] The adhesive strength is measured as 180° peel adhesive strength in accordance with JIS Z 0237. Specifically, the adhesive is applied to a 25 mm wide slide glass to a thickness of 0.2 mm, and dried for 12 hours in an environment of 50% humidity and 23°C temperature to form an adhesive layer sample, and the cotton and the adhesive layer sample are pressed together with a roller at a pressure of 0.5 kgf / 25 mm, and the 180° tensile adhesive strength is measured. The measurement is performed at an air temperature of 23°C.

[0020] 1.2.Acrylic resin By including the acrylic resin, the adhesive strength of the adhesive layer formed on the fabric transport member is further improved. The acrylic resin may be a water-soluble resin or a resin emulsion dispersed in an aqueous medium. These are collectively referred to as aqueous acrylic resin in this embodiment. By using the aqueous acrylic resin, the environmental load caused by the organic solvent can be reduced, and the peelability also tends to be further improved.

[0021] The acrylic resin is not particularly limited as long as it is a polymer obtained by polymerizing an acrylic monomer such as (meth)acrylic acid or a (meth)acrylic acid ester as one component, and examples thereof include a resin obtained from an acrylic monomer, a copolymer of an acrylic monomer and another monomer, etc. The other monomer is not particularly limited, and examples thereof include a copolymer of an acrylic monomer with acrylamide, acrylonitrile, styrene, etc.

[0022] The content of the acrylic resin is preferably 80 to 100 mass%, 90 to 99.9 mass%, or 95 to 99.6 mass% based on the total amount of the aqueous pressure-sensitive adhesive composition. When the content of the acrylic resin is 80 mass% or more, the adhesive strength and water resistance of the adhesive layer tend to be further improved. In addition, the content of the acrylic resin may be 100 mass% or less, but when it is 99.9 mass% or less, the mechanical strength of the adhesive layer tends to be further improved.

[0023] The acrylic resin may have a plurality of polymer chains partially crosslinked at the side chains, etc. This allows the acrylic resin to have higher strength. The crosslinking agent is not particularly limited, but examples thereof include those having a functional group capable of forming an ester or amide bond with a carboxyl group of the acrylic resin. Such functional groups are not particularly limited as long as they are conventionally known, but examples thereof include a hydroxyl group, an amine group, a carbodiimide group, and an epoxy group.

[0024] The acrylic resin may be used alone or in combination of two or more kinds. For example, the acrylic resin may be used by mixing a highly adhesive acrylic resin emulsion and a high-strength acrylic resin emulsion. This allows the adhesive strength of the adhesive layer formed by the aqueous adhesive composition to be easily adjusted within the above-mentioned range. Here, an uncrosslinked acrylic resin emulsion may be used as the highly adhesive acrylic resin emulsion, and a crosslinked acrylic resin emulsion may be used as the high-strength acrylic resin emulsion.

[0025] When an uncrosslinked acrylic resin emulsion is used as the highly adhesive acrylic resin emulsion, the solid content of the uncrosslinked acrylic resin emulsion is preferably 20 to 90 mass%, 40 to 80 mass%, or 50 to 70 mass% relative to the total amount of the aqueous pressure-sensitive adhesive composition. When the solid content of the uncrosslinked acrylic resin emulsion is within the above range, the adhesive strength of the adhesive layer tends to be further improved.

[0026] When a crosslinked acrylic resin emulsion is used as the high-strength acrylic resin emulsion, the solid content of the crosslinked acrylic resin emulsion is preferably 10 to 80 mass%, 20 to 60 mass%, or 30 to 50 mass% relative to the total amount of the aqueous pressure-sensitive adhesive composition. When the solid content of the crosslinked acrylic resin emulsion is within the above range, the water resistance and mechanical strength of the pressure-sensitive adhesive layer tend to be further improved.

[0027] The solid content of the crosslinked acrylic resin emulsion is preferably 10 to 80 mass%, 20 to 60 mass%, or 30 to 50 mass%, based on the total amount of the acrylic resin. When the solid content of the crosslinked acrylic resin emulsion is within the above range, the water resistance and mechanical strength of the adhesive layer tend to be further improved.

[0028] 1.3.Surfactants The aqueous pressure-sensitive adhesive composition of the present embodiment preferably further contains a surfactant. The surfactant is not particularly limited, but examples thereof include anionic surfactants, nonionic surfactants, and cationic surfactants.

[0029] The anionic surfactant is not particularly limited, but examples thereof include compounds having any hydrophilic group such as a carboxylic acid group, a sulfonic acid group, a sulfate group, or a phosphate group, and any hydrophobic group such as an aliphatic group or an aromatic group.

[0030] Examples of anionic surfactants include alkyl sulfocarboxylates, alkyl diphenyl ether disulfonates, α-olefin sulfonates, polyoxyethylene alkyl ether acetates, N-acyl amino acids and their salts, N-acyl methyl taurine salts, alkyl sulfates such as ammonium lauryl sulfate and sodium lauryl sulfate, alkyl sulfate polyoxyalkyl ether sulfates, alkyl sulfate polyoxyethylene alkyl ether phosphates, rosin acid soap, castor oil sulfate esters, lauryl alcohol sulfate esters, alkyl phenol phosphates, alkyl phosphates, alkylaryl sulfonates, diethyl sulfosuccinates, diethyl hexyl sulphosuccinates, dioctyl sulfosuccinates, etc. Examples of commercially available anionic surfactants include, but are not limited to, Pelex SS-H, Pelex SS-L (trade names, manufactured by Kao Corporation), etc. One type may be used alone, or two or more types may be used in combination.

[0031] Examples of nonionic surfactants include acetylene glycol surfactants, silicone surfactants, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene fatty acid esters, polyoxyethylene hydrogenated castor oil, propylene glycol fatty acid esters, glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, alkyl polyglycosides, alkyl diethanolamides, and alkyl amine oxides.

[0032] Examples of the cationic surfactant include alkylamine salts, fatty acid amidoamine salts, monoalkyl-type quaternary ammonium salts, dialkyl-type quaternary ammonium salts, trialkyl-type quaternary ammonium salts, benzalkonium-type quaternary ammonium salts, benzethonium chloride, and alkylpyridinium salts.

[0033] Among these, anionic surfactants are preferred, ammonium salt-type anionic surfactants such as ammonium lauryl sulfate are more preferred, and alkyl ammonium sulfate-type surfactants are even more preferred.By using such surfactants, the water resistance of the adhesive layer obtained by coating and drying is further improved, and even if the adhesive layer is washed with water using physical means, the damage caused by the washing tends to be more suppressed.

[0034] The content of the surfactant is preferably 0.1 to 10 mass%, 0.5 to 8.0 mass%, or 1.0 to 6.0 mass%, based on the total amount of the aqueous pressure-sensitive adhesive composition. When the content of the surfactant is within the above range, the water resistance and mechanical strength of the pressure-sensitive adhesive layer tend to be further improved.

[0035] 1.4.Water The water content is preferably 30 to 80 mass %, 35 to 70 mass %, or 40 to 60 mass %, based on the total amount of the aqueous pressure-sensitive adhesive composition.

[0036] 1.5. Ammonia, Ammonium Ion The aqueous pressure-sensitive adhesive composition of the present embodiment preferably contains ammonia or ammonium ions. By including an acrylic resin that contributes to adhesion, and ammonia or ammonium ions, the stability of the aqueous pressure-sensitive adhesive composition is improved, and the water resistance and mechanical strength of the resulting pressure-sensitive adhesive layer tend to be improved. When the pressure-sensitive adhesive layer is dried, it volatilizes as ammonia together with water, so the ammonium salt is no longer a salt and is less soluble in water, improving water resistance. When Na ions or K ions are used instead of ammonium ions, the metal ions do not volatilize, so water resistance is not improved. Here, the aqueous pressure-sensitive adhesive composition of the present embodiment further contains a pH adjuster, and the pH adjuster preferably contains ammonia. The ammonia may function as an emulsion stabilizer. In addition, an anionic surfactant, particularly an alkyl ammonium sulfate surfactant, may function as an emulsion dispersant for the aqueous pressure-sensitive adhesive composition. This makes it possible to improve the water resistance of the adhesive layer obtained by coating and drying even when an aqueous acrylic resin is used, and even when the adhesive layer is washed with water using a physical means, it tends to be possible to suppress damage to the adhesive layer caused by the water washing.

[0037] The content of ammonia is preferably 0.1 to 5.0 mass%, 0.3 to 2.0 mass%, or 0.5 to 3.0 mass% based on the total amount of the aqueous pressure-sensitive adhesive composition. When the content of ammonia is within the above range, water resistance tends to be further improved. The content of ammonia may include the content of ammonium ions contained in the aqueous pressure-sensitive adhesive composition.

[0038] In the aqueous pressure-sensitive adhesive composition of the present embodiment, the ammonium ion content is preferably greater than the total content of sodium ions and potassium ions, which tends to further improve water resistance.

[0039] In the aqueous pressure-sensitive adhesive composition of the present embodiment, the ratio of the ammonium ion content to the total content of sodium ions and potassium ions, (ammonium ions) / (sodium ions and potassium ions), is preferably at least 100. This tends to further improve water resistance. From the above viewpoints, (ammonium ion) / (sodium ion and potassium ion) is preferably 140 or more, 180 or more, or 200 or more. The ratio (ammonium ion) / (sodium ion and potassium ion) is preferably 350 or less, and more preferably 300 or less.

[0040] 1.6. Organic Solvents The aqueous adhesive composition of the present embodiment preferably does not contain an organic solvent from the viewpoint of reducing the environmental load and the effect on the human body. When the aqueous adhesive composition contains an organic solvent, the content of the organic solvent is preferably 5.0 mass% or less, 2.5 mass% or less, or 1.0 mass% or less based on the total amount of the aqueous adhesive composition. This can reduce the environmental load and can reduce VOC (volatile organic compounds) when using the aqueous adhesive composition, which tends to improve the working environment.

[0041] The organic solvent in this embodiment does not include the above-mentioned amine compounds or surfactants.

[0042] 1.7.Colorants The aqueous adhesive composition of the present embodiment preferably does not contain a coloring material. When the aqueous adhesive composition contains a coloring material, the content of the coloring material is preferably 1.0 mass% or less, 0.5 mass% or less, or 0.3 mass% or less, based on the total amount of the aqueous adhesive composition. This allows the aqueous adhesive composition of the present embodiment to be clearly distinguished from compositions intended for coloring, such as ink compositions, printing pastes, and paints.

[0043] The aqueous pressure-sensitive adhesive composition of the present embodiment is an aqueous pressure-sensitive adhesive composition for forming an adhesive layer on a fabric transport belt of an inkjet textile printing device.

[0044] The material of the fabric conveying belt is not particularly limited. The fabric conveying belt may contain, for example, a urethane resin, polyester, etc., and preferably contains a urethane resin. When the material constituting the surface of the fabric conveying belt is a urethane resin, conveyance properties tend to be improved.

[0045] The fabric transfer belt may be fibrous, and preferably contains polyphenylene ether fibers or aramid fibers, which tends to improve the mechanical strength of the fabric transfer belt.

[0046] The pencil hardness of the adhesive layer is preferably HB or more, 2H or more, and 4H or more, which provides the adhesive layer with excellent strength. The Mohs hardness of the adhesive layer is preferably at least 2. This provides the adhesive layer with excellent strength. The pencil hardness and Mohs hardness of the adhesive layer can be adjusted by the amount of high-strength acrylic resin emulsion (crosslinked acrylic resin emulsion) used.

[0047] 2. Method for preparing the aqueous adhesive composition The method for producing the aqueous adhesive composition of this embodiment includes a mixing step of mixing a first solution containing an acrylic resin emulsion with a second solution containing the acrylic resin emulsion and a crosslinker, and the adhesive strength of the adhesive layer formed from the first solution is higher than the adhesive strength of the adhesive layer formed from the second solution.

[0048] The first solution containing the acrylic resin emulsion can form an adhesive layer with higher adhesion compared to the second solution containing the acrylic resin emulsion and a crosslinking agent. The second solution containing an acrylic resin emulsion and a crosslinking agent can form an adhesive layer with higher strength than the first solution containing an acrylic resin emulsion. By mixing a first solution containing an acrylic resin emulsion with a second solution containing an acrylic resin emulsion and a crosslinking agent, the resulting adhesive layer has excellent transportability for fabric.

[0049] As the acrylic resin emulsion, a commercially available product may be used, for example, BPW6441 (manufactured by Toyochem Co., Ltd.).

[0050] The crosslinking agent is not particularly limited, but examples thereof include Carbodilite E-02 (manufactured by Nisshinbo Chemical Inc.).

[0051] The second solution preferably contains ammonia. When the second solution contains an acrylic resin that contributes to adhesion and ammonia, the stability of the aqueous pressure-sensitive adhesive composition is improved, and the water resistance and mechanical strength of the resulting pressure-sensitive adhesive layer tend to be further improved.

[0052] 3. Inkjet printing equipment The inkjet printing apparatus of this embodiment includes a conveying mechanism that conveys a fabric by laminating the fabric to an adhesive layer made of the aqueous adhesive composition of this embodiment formed on the surface of a fabric conveying belt, a recording unit that performs textile printing recording on the fabric attached to the adhesive layer using an inkjet head, and a cleaning unit that cleans the adhesive layer from which the fabric has been peeled off after textile printing recording.

[0053] The conveying mechanism conveys the fabric by laminating the fabric to the adhesive layer made of the aqueous adhesive composition of the present embodiment formed on the surface of the fabric conveying belt. A method for forming an adhesive layer using the aqueous pressure-sensitive adhesive composition of the present embodiment may include a step of applying the aqueous pressure-sensitive adhesive composition to a surface of a fabric transport member of an inkjet textile printing apparatus to form an adhesive layer.

[0054] The step of forming the adhesive layer is a step of adhering the aqueous adhesive composition to the surface of the fabric transport member to form an adhesive layer. The method of adhering the aqueous adhesive composition to the fabric transport member is not particularly limited, but the aqueous adhesive composition may be applied uniformly to the entire surface of the fabric transport member using a blade or the like, or may be applied to a part of the surface of the fabric transport member in a predetermined pattern.

[0055] In the adhesive layer forming step, the aqueous adhesive composition may be dried to form the adhesive layer. The drying temperature is preferably 10 to 60° C., and more preferably 20 to 40° C. The drying time is preferably 1 to 24 hours, and more preferably 2 to 8 hours. This tends to further improve the water resistance and mechanical strength of the resulting adhesive layer.

[0056] An inkjet textile printing apparatus 100 of this embodiment will be described with reference to Fig. 1. Fig. 1 is an overall configuration diagram of the inkjet textile printing apparatus 100 including a transport device 200 of this embodiment. In Fig. 1, arrows a and b indicate the transport direction of a recording medium 300. Arrows c and d indicate the rotation direction of a fabric transport member 210. Arrows e and f indicate the rotation directions of transport rollers 221 and 222.

[0057] The inkjet printing apparatus 100 may have a conveying device 200 for attaching a recording medium to a surface and conveying it, recording medium conveying rollers 111 and 112, and a recording unit 120. A recording medium 300 coming from a direction a is pressed against a fabric conveying member 210 by the recording medium conveying roller 111, and the recording medium 300 is attached to the surface of the fabric conveying member 210.

[0058] With recording medium 300 attached to the surface of fabric transport member 210, transport device 200 transports recording medium 300 directly below recording unit 120, which then records on recording medium 300. Then, recording medium transport rollers 112 separate recording medium 300 from fabric transport member 210.

[0059] The recording unit 120 may eject an ink composition or the like by an inkjet method. In this embodiment, it is assumed that an inkjet head is used for the recording unit 120 and printing is performed on a textile fabric as the recording medium 300, but the present invention is not limited to this.

[0060] The conveying device 200 may include a pair of conveying rollers 221 and 222 , a fabric conveying member 210 , a drive motor 230 , a control device 240 , a cleaning unit 250 , and a removing member 260 .

[0061] The transport rollers 221, 222 are rollers for transporting the fabric transport member 210 in a fixed direction. The fabric transport member 210 may be a belt member having an adhesive layer on its surface, and is provided around the transport rollers 221, 222. The fabric transport member 210 transports the recording medium in the direction of arrow c as the transport rollers 221, 222 are rotated by the drive motor 230. The control device 240 may control either the transport device 200 or the inkjet printing device 100, or both.

[0062] The cleaning unit 250 cleans the surface of the fabric transport member 210 that has been peeled off from the recording medium 300. The cleaning unit 250 cleans the components of the recording medium 300 and the printing colorant that have adhered to the fabric transport member 210 during printing. The cleaning unit 250 may include a pump (not shown), a water sprinkler port, and a water sprinkler pipe.

[0063] The removing member 260 removes water that has been attached to the fabric transport member 210 by the cleaning unit 250. The removing member 260 is not particularly limited, but may be, for example, a blade. The material of the blade is preferably an elastic material. Furthermore, polyurethane is preferable from the viewpoint of abrasion resistance. The contact portion with the fabric transport member 210 may have a rectangular cross section, or may have a shape with a diagonally cut-off tip.

[0064] An elastic material is preferable for the fabric transport member 210. A heater (not shown) may be provided to warm the fabric transport member 210. In the process of washing the fabric transport member 210, a water receiving section (not shown) for receiving washing water, a brush (not shown) for cleaning the fabric transport member 210, a sponge (not shown), etc. may be used.

[0065] The recording medium 300 may be a fabric made of natural or synthetic fibers such as silk, cotton, wool, nylon, polyester, or rayon.

[0066] 4.Fabric transport belt for inkjet printing equipment The fabric conveying belt of the inkjet printing device of the present embodiment has an adhesive layer derived from the aqueous pressure-sensitive adhesive composition of the present embodiment on its surface. The fabric conveying belt is not particularly limited, but is preferably made of an elastic material, particularly preferably a urethane material. By using the aqueous pressure-sensitive adhesive composition described above for such a fabric conveying belt, the adhesion between the adhesive layer and the fabric conveying belt is further improved, and the durability is improved.

[0067] 5. Inkjet printing method The inkjet textile printing method includes a transporting step of transporting a fabric by bonding the fabric to an adhesive layer made of the aqueous adhesive composition formed on the surface of a fabric transport member (e.g., a fabric transport belt) of an inkjet textile printing device, a recording step of performing textile printing recording on the fabric bonded to the adhesive layer using an inkjet head, and a cleaning step of cleaning the adhesive layer from which the fabric has been peeled off after textile printing recording.

[0068] 5.1.Transportation process The conveying step is a step of laminating the fabric to the adhesive layer of the aqueous adhesive composition formed on the surface of the fabric conveying member of the inkjet printing device and conveying the fabric. The lamination method is not particularly limited, but may be a method of pressing the two together using a conveying roll as shown in FIG.

[0069] 5.2.Recording process The recording process is a process of performing a textile printing recording on the fabric attached to the adhesive layer using an inkjet head. In the recording process, the fabric transport member and the fabric are transported in a state of being in close contact with each other via the adhesive layer on the surface of the fabric transport member, and ink is ejected from the recording unit 120 and adhered to the fabric during the transport process. After that, the fabric with the ink adhered thereto may be peeled off from the adhesive layer and collected.

[0070] 5.3.Cleaning process The cleaning step is a step of cleaning the adhesive layer from which the fabric has been peeled off after the textile printing. This step makes it possible to remove dust such as lint and other debris from the fabric that has adhered during the recording step from the surface of the adhesive layer. EXAMPLES

[0071] The present invention will be described in more detail below using examples and comparative examples, but the present invention is not limited to the following examples.

[0072] 1. Preparation of Water-Based Pressure-Sensitive Adhesive Composition FIG. 2 shows Table 1, which shows the composition of the aqueous adhesive composition. Each component was placed in a mixing tank and mixed and stirred to obtain the composition shown in Table 1, to obtain the aqueous adhesive composition of each example. In each example in the table, the solid content is shown as "component amount" in mass %. In addition, the "component amount" for ammonia water indicates that the ammonia content is 28 mass %. As for the other components, it indicates that the product does not contain a solvent or the like, and that the "component amount" is 100 mass %.

[0073] The numerical values ​​in the table represent mass % unless otherwise specified. The components used in Table 1 are as follows.

[0074] [Crosslinking Agent] Carbodilite (registered trademark) E-02 (manufactured by Nisshinbo Chemical Inc.) [Acrylic resin] Highly adhesive water-based acrylic emulsion A-1 Product name: BPW6441 (non-volatile content 50% by mass), manufactured by Toyochem Co., Ltd. High-strength water-based acrylic emulsion A-2: A solution obtained by mixing 50 parts by weight of BPW6441 (manufactured by Toyochem Co., Ltd.) and 1 part by weight of Carbodilite E-02 (manufactured by Nisshinbo Co., Ltd.) and crosslinking the mixture at 70°C for 5 hours. A-3: A solution obtained by mixing 50 parts by weight of BPW6441, 1 part by weight of Carbodilite E-02, and 1 part by weight of 28% aqueous ammonia, and crosslinking the mixture at 70°C for 5 hours. A-4: A solution obtained by mixing 50 parts by weight of BPW6441, 1 part by weight of Carbodilite E-02, and 0.2 parts by weight of a 1% NaOH aqueous solution and crosslinking the mixture at 70°C for 5 hours. [Surfactant] Ammonium Lauryl Sulfate 〔alkali〕 Ammonia water (contains ammonium ions)

[0075] The ammonium ion concentration and the total ion concentration of sodium ions and potassium ions in the aqueous pressure-sensitive adhesive composition obtained as described above were measured using an ammonia meter TiN-9001, a sodium ion meter TiN-1100, and a potassium ion meter TiN-7003 manufactured by Toko Chemical Research Institute.

[0076] 2. Evaluation Method 2.1. Adhesive strength The 180° peel adhesive strength was measured according to JIS Z 0237. Specifically, the adhesive was applied to a 25 mm wide slide glass to a thickness of 0.2 mm, and dried for 12 hours under an environment of 50% humidity and 23°C temperature to form an adhesive layer sample, and the cotton and the adhesive layer sample were pressed together with a roller at a pressure of 0.5 kgf / 25 mm, and the 180° tensile adhesive strength was measured. The measurement was performed at an air temperature of 23°C.

[0077] 2.2.Pencil hardness The pencil hardness of the adhesive layer sample formed as described above was measured by the scratch hardness test (500g pencil method) of JIS5600-5-4. However, if the adhesive has a strong adhesive force, it may not be possible to push the tester, so the scratches caused when the tester was pulled were measured.

[0078] 2.3.Mohs hardness scale The Mohs hardness of the adhesive layer sample formed as described above was evaluated by rubbing with talc having a Mohs hardness of 1. If the sample was scratched, it was rated as having a Mohs hardness of 1, and if the sample was not scratched by talc, it was rated as having a Mohs hardness of 2.

[0079] 2.4. Water resistance The adhesive layer sample formed as described above was immersed in pure water at 23° C. for 20 minutes, and the degree of whitening of the adhesive layer sample was visually evaluated. The more whitened the sample, the poorer its water resistance was, and the water resistance was evaluated according to the following evaluation criteria depending on the degree of whitening. (Evaluation Criteria) A:Transparent B: Slightly bleached C: Severe bleaching

[0080] 2.5. Transportability The aqueous adhesive composition of the Example or Comparative Example was uniformly applied to the entire surface of a fabric conveying belt of an Epson digital textile printing machine MonnaLisa 8000 using a blade, and dried to form an adhesive layer. Two types of fabric conveying belts were prepared, one with a urethane surface and the other with a polyester surface. A fabric was attached to the adhesive layer formed on the surface of the fabric transport belt, and the fabric was transported 10 m, 1000 m, and 10000 m by the transport mechanism of the inkjet printing device, and the transportability was evaluated according to the following evaluation criteria. (Evaluation Criteria) A: We were able to transport cotton and polyester. B: Cotton could be transported, but polyester could not be transported. C: Cotton and polyester could be transported, but adhesive adhered to the fabric. D: Cloth and polyester could not be conveyed. E: When peeling off the belt, the cloth, film, or other sheet stretched.

[0081] As is clear from Table 1, excellent results were obtained in the present invention. In contrast, satisfactory results were not obtained in the comparative examples. [Explanation of symbols]

[0082] 100... inkjet printing apparatus, 111, 112... recording medium transport rollers, 120... recording unit, 200... transport device, 210... fabric transport member, 221, 222... transport rollers, 230... drive motor, 240... control device, 250... cleaning unit, 260... removal member, 300... recording medium.

Claims

1. 1. An aqueous adhesive composition for forming an adhesive layer on a fabric transport belt of an inkjet textile printing device, comprising: Contains acrylic resin, The adhesive strength of the adhesive layer formed from the aqueous adhesive composition is 0.1 N / 25 mm or more and 10 N / 25 mm or less. Aqueous pressure sensitive adhesive composition.

2. The ammonium ion content is greater than the total content of sodium ions and potassium ions. The aqueous pressure-sensitive adhesive composition according to claim 1 .

3. 2. The aqueous pressure-sensitive adhesive composition according to claim 1, wherein the ratio of the content of ammonium ions to the total content of sodium ions and potassium ions, (ammonium ions) / (sodium ions and potassium ions), is 100 or more.

4. The fabric conveying belt contains a urethane resin. The aqueous pressure-sensitive adhesive composition according to claim 1 .

5. The adhesive layer has a pencil hardness of HB or more. The aqueous pressure-sensitive adhesive composition according to claim 1 .

6. The adhesive layer has a Mohs hardness of 2 or more. The aqueous pressure-sensitive adhesive composition according to claim 1 .

7. Further comprising a surfactant, The surfactant comprises an alkyl ammonium sulfate. The aqueous pressure-sensitive adhesive composition according to claim 1 .

8. Further comprising a pH adjuster, The pH adjuster includes ammonia. The aqueous pressure-sensitive adhesive composition according to claim 1 .

9. The fabric conveying belt contains polyphenylene ether fibers or aramid fibers. The aqueous pressure-sensitive adhesive composition according to claim 1 .

10. A pressure-sensitive adhesive layer comprising the aqueous pressure-sensitive adhesive composition according to any one of claims 1 to 9 on a surface thereof. Fabric transport belt for inkjet textile printing equipment.

11. A conveying mechanism for laminating a fabric to the adhesive layer made of the aqueous adhesive composition according to any one of claims 1 to 9, the adhesive layer being formed on a surface of a fabric conveying belt, and conveying the fabric; a recording unit that performs printing recording on the fabric attached to the adhesive layer using an inkjet head; and a cleaning unit that cleans the adhesive layer from which the fabric has been peeled off after the textile printing recording. Inkjet textile printing device.

12. A method for producing the aqueous pressure-sensitive adhesive composition according to any one of claims 1 to 9, comprising the steps of: The method includes a mixing step of mixing a first solution containing an acrylic resin emulsion with a second solution containing the acrylic resin emulsion and a crosslinking agent, The adhesive strength of the adhesive layer formed from the first solution is higher than the adhesive strength of the adhesive layer formed from the second solution. A method for preparing a water-based adhesive composition.

13. the second solution comprises ammonia; A method for preparing the aqueous adhesive composition of claim 12.

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