Aqueous adhesive composition, tape for conveying fabric, inkjet printing device, and method for producing aqueous

Abstract

The present disclosure provides an aqueous adhesive composition, a belt for fabric conveyance, an inkjet textile printing device, and a method for producing the aqueous adhesive composition, which have excellent fabric conveyance properties and can reduce environmental burden and improve working environment. The present invention relates to an aqueous adhesive composition for forming an adhesive layer on a fabric conveying belt of an inkjet textile printing device, the aqueous adhesive composition containing an acrylic resin, and the adhesive force of the adhesive layer formed from the aqueous adhesive composition being 0.1 N / 25 mm or more and 10 N / 25 mm or less.

Description

Technical Field

[0001] The present invention relates to a water-based adhesive composition, a fabric conveying belt, an inkjet printing and dyeing device, and a method for preparing the water-based adhesive composition. Background Art

[0002] The inkjet recording method can record high-definition images with a relatively simple device, and therefore has been rapidly developed in various fields. Among them, various studies have been proposed on ejection stability, etc. For example, Patent Document 1 discloses the following conveying device and image recording device as a printing and dyeing technology using an inkjet method, wherein a displacement suppression component for the conveying component is provided in order to stabilize the contact state between the removal component and the conveying component and to improve the recovery performance of the cleaning water by the removal component.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent document 1: Japanese Patent Application Publication No. 2020-109036.

[0006] In the printing and dyeing technology using the inkjet method, the cloth is attached to a conveying member (an endless belt, etc.), and then the cloth is transported to the printing section. An adhesive (mounting agent) is applied to the surface of the conveying member, and the surface of the conveying member has adhesive properties. After printing, the cloth is peeled off from the conveying member and transported to the next process. On the other hand, since the conveying member after the cloth is peeled off needs to be attached to the cloth again, it is preferable to remove the ink, thread ends, and other residual parts attached to the conveying member during the printing process. Usually, the ink, thread ends, and other residual parts attached to the conveying member are cleaned with water. At this time, sometimes a cleaning member such as a brush or sponge that contacts the conveying member for cleaning can be used. Usually, the adhesiveness based on the adhesive is maintained until the water is washed a certain number of times, and there is no need to apply a new adhesive for each washing.

[0007] Regarding the adhesive, Patent Document 1 states that “the adhesive for imparting adhesiveness to the conveying member 1 is not particularly limited in type, and examples thereof include rubber-based adhesives containing natural rubber or synthetic rubber as main components, acrylic-based adhesives, and silicone-based adhesives.”

[0008] The adhesive used in such inkjet printing needs to maintain a certain degree of adhesive strength even if the adhesive surface is repeatedly washed with water, so an adhesive in which a hydrophobic resin is dissolved in an organic solvent is generally used. However, in order to reduce environmental burden and improve the working environment, a water-based adhesive with a reduced amount of organic solvent is required.

[0009] On the other hand, the conveyability of the fabric of the water-based adhesive is not sufficient (the conveyability means that the fabric can be conveyed by a belt and can be easily peeled off).

[0010] There is a demand for an adhesive which is a water-based adhesive, wherein the adhesive contains an acrylic resin and has a predetermined adhesive force to provide excellent conveyance properties for fabrics, and to reduce environmental burden and improve the working environment. Summary of the invention

[0011] The aqueous adhesive composition of the present invention is an aqueous adhesive composition for forming an adhesive layer on a fabric conveying belt of an inkjet printing device, the aqueous adhesive composition contains an acrylic resin, and the adhesive force of the adhesive layer formed by the aqueous adhesive composition is greater than or equal to 0.1 N / 25 mm and less than or equal to 10 N / 25 mm.

[0012] The fabric conveying belt for the inkjet printing device of the present invention has an adhesive layer derived from the aqueous adhesive composition of the present invention on the surface.

[0013] The inkjet printing device of the present invention comprises: a conveying mechanism for laminating a cloth to an adhesive layer based on the aqueous adhesive composition of the present invention formed on the surface of a cloth conveying belt and conveying the cloth; a recording section for performing printing and dyeing recording on the cloth attached to the adhesive layer using an inkjet head; and a cleaning section for cleaning the adhesive layer of the cloth that has been peeled off after the printing and dyeing recording.

[0014] The preparation method of the aqueous adhesive composition of the present invention is a manufacturing method of the aqueous adhesive composition of the present invention, which has a mixing step of mixing a first solution containing an acrylic resin emulsion with a second solution containing an acrylic resin emulsion and a crosslinking agent, wherein the adhesive force of the adhesive layer formed by the first solution is higher than the adhesive force of the adhesive layer formed by the second solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic cross-sectional view of an inkjet printing and dyeing device.

[0016] Figure 2 Data of the Example are shown.

[0017] Explanation of symbols

[0018] 100, inkjet printing device; 111, 112, recording medium conveying rollers; 120, recording unit; 200, conveying device; 210, cloth conveying component; 221, 222, conveying rollers; 230, driving motor; 240, control device; 250, cleaning unit; 260, removing component; 300, recording medium. DETAILED DESCRIPTION

[0019] Hereinafter, the implementation mode of the present invention (hereinafter referred to as "this embodiment") will be described in detail with reference to the accompanying drawings as needed, but the present invention is not limited thereto and may have various deformations within the scope of the main purpose. It should be noted that the same elements are marked with the same symbols in the accompanying drawings and repeated descriptions are omitted. In addition, the positional relationship such as up and down, left and right, etc., unless otherwise specified, is based on the positional relationship shown in the accompanying drawings. Moreover, the dimensional ratio of the accompanying drawings is not limited to the ratio shown in the drawings.

[0020] 1. Water-based adhesive composition

[0021] The aqueous adhesive composition of this embodiment is an aqueous adhesive composition for forming an adhesive layer on a fabric conveying belt of an inkjet printing device, the aqueous adhesive composition contains an acrylic resin, and the adhesive force of the adhesive layer formed by the aqueous adhesive composition is greater than or equal to 0.1 N / 25 mm and less than or equal to 10 N / 25 mm.

[0022] In a conventional inkjet printing device, an adhesive layer is formed on a conveying member such as an endless belt, and a cloth as a recording medium is attached to the adhesive layer. Then, after the cloth is conveyed to a printing unit for recording, the conveying member and the cloth are peeled off.

[0023] As such adhesives for fabric conveying components, solvent-based acrylic adhesives have been used in the past. However, organic solvents of solvent-based acrylic adhesives volatilize when the adhesive is applied, which may have a negative impact on human bodies in the working environment. In addition, when using solvent-based acrylic adhesives, an exhaust device needs to be installed in the use environment of the inkjet printing and dyeing device, resulting in high costs for the overall device structure.

[0024] In addition, as another problem, an adhesive is applied to the fabric conveying part of the inkjet printing device to form an adhesive layer. In order to make the fabric adhere closely to the adhesive layer for conveying, it is also required to have appropriate adhesive strength for sticking and peeling the fabric, and excellent conveying properties of the fabric and sheet.

[0025] In view of the above problems, the aqueous adhesive composition of the present embodiment includes the above-mentioned structure, thereby achieving excellent conveyance properties for fabrics, reducing environmental burdens, and improving the working environment.

[0026] Next, each component contained in the aqueous adhesive composition will be described in detail.

[0027] 1.1. Adhesion

[0028] The adhesive force 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.

[0029] By setting the adhesive force to be 0.1 N / 25 mm or more, the cloth can be conveyed well. If the adhesive force is less than 0.1 N / 25 mm, the cloth will have a portion protruding from the belt, so the cloth will not be evenly flat, and uneven printing may occur. From the above viewpoint, the adhesive force is preferably 0.1 N / 25 mm or more, 1.0 N / 25 mm or more, or 3.0 N / 25 mm or more.

[0030] By setting the adhesive force to 10 N / 25 mm or less, the cloth will not be stretched or damaged, and the cloth being transported can be easily peeled off from the belt. From the above viewpoint, the adhesive force is preferably 9.5 N / 25 mm or less, 9.0 N / 25 mm or less.

[0031] The adhesive strength was measured in accordance with JIS Z 0237 as 180° peel adhesive strength.

[0032] Specifically, a 0.2 mm thick adhesive was applied to a 25 mm wide glass slide, dried for 12 hours in an environment with a humidity of 50% and a temperature of 23°C to form an adhesive layer sample, and the cotton and the adhesive layer sample were rolled under a pressure of 0.5 kgf / 25 mm to obtain a sample for 180° tensile adhesion. The measurement was performed at an air temperature of 23°C.

[0033] 1.2. Acrylic resin

[0034] By including an acrylic resin, the adhesive strength of the adhesive layer formed on the fabric conveying member is further improved. The acrylic resin may be a water-soluble resin or a resin emulsion dispersed in an aqueous medium. In this embodiment, they are collectively referred to as water-based acrylic resins. By using a water-based acrylic resin, the environmental burden caused by organic solvents can be reduced, and there is also a tendency to further improve the peeling property.

[0035] The acrylic resin may be a polymer obtained by polymerizing an acrylic monomer such as (meth)acrylic acid or (meth)acrylic ester as a component, and is not particularly limited. Examples thereof include resins obtained from acrylic monomers, copolymers of acrylic monomers and other monomers, etc. Other monomers are not particularly limited, and examples thereof include acrylic monomers and acrylamide, acrylonitrile, styrene, etc.

[0036] The content of the acrylic resin is preferably 80 to 100% by mass, 90 to 99.9% by mass, or 95 to 99.6% by mass relative to the total amount of the aqueous adhesive composition. By making the content of the acrylic resin 80% or more by mass, the adhesive force and water resistance of the adhesive layer tend to be further improved. In addition, the content of the acrylic resin may be 100% by mass or less, and by making it 99.9% or less by mass, the mechanical strength of the adhesive layer tends to be further improved.

[0037] The multiple polymer chains of the acrylic resin can be partially cross-linked at the side chain or the like. This can make the acrylic resin have a higher strength. The cross-linking agent is not particularly limited, and examples thereof include a cross-linking agent having a functional group that can form an ester or amide bond with a carboxyl group of the acrylic resin. Such a functional group can be any known one and is not particularly limited, and examples thereof include a hydroxyl group, an amino group, a carbodiimide group, an epoxy group, and the like.

[0038] The acrylic resin can be used alone or in combination of two or more. For example, the acrylic resin can be used by mixing a high-adhesive acrylic resin emulsion with a high-strength acrylic resin emulsion. Thus, the adhesive force of the adhesive layer formed by the aqueous adhesive composition can be easily adjusted to the above range. Here, an uncrosslinked acrylic resin emulsion can be used as the high-adhesive acrylic resin emulsion, and a crosslinked acrylic resin emulsion can be used as the high-strength acrylic resin emulsion.

[0039] When an uncrosslinked acrylic resin emulsion is used as the high-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 adhesive composition. By making the solid content of the uncrosslinked acrylic resin emulsion within the above range, the adhesive strength of the adhesive layer tends to be further improved.

[0040] When a cross-linked acrylic resin emulsion is used as a high-strength acrylic resin emulsion, the solid content of the cross-linked 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 adhesive composition. By making the solid content of the cross-linked acrylic resin emulsion within the above range, the water resistance and mechanical strength of the adhesive layer tend to be further improved.

[0041] In addition, the solid content of the cross-linked 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 acrylic resin. When the solid content of the cross-linked acrylic resin emulsion is within the above range, the water resistance and mechanical strength of the adhesive layer tend to be further improved.

[0042] 1.3. Surfactants

[0043] The aqueous adhesive composition of the present embodiment preferably further contains a surfactant.

[0044] The surfactant is not particularly limited, and examples thereof include anionic surfactants, nonionic surfactants, and cationic surfactants.

[0045] The anionic surfactant is not particularly limited, and examples thereof include compounds having any hydrophilic group such as carboxylic acid group, sulfonic acid group, sulfate group, and phosphate group, and any hydrophobic group such as aliphatic group, aromatic group, or the like.

[0046] As anionic surfactants, for example, alkyl sulfonate carboxylates, alkyl diphenyl ether disulfonates, α-olefin sulfonates, polyoxyethylene alkyl ether acetates, N-acylamino acids and salts thereof, N-acylmethyl taurates, ammonium dodecyl sulfate, sodium dodecyl sulfate and other alkyl sulfates, alkyl sulfate polyoxyalkyl ether sulfates, alkyl sulfate polyoxyethylene alkyl ether phosphates, rosin acid soaps, castor oil sulfate esters, dodecanol sulfate esters, alkylphenol type phosphates, alkyl type phosphates, alkyl aryl sulfonates, diethyl sulfosuccinates, diethylhexyl sulfosuccinates, dioctyl sulfosuccinates, etc. Commercially available products of anionic surfactants are not particularly limited, and for example, PELEX SS-H, PELEX SS-L (the above are trade names, produced by Kao Corporation), etc. can be used alone or in combination of two or more.

[0047] Examples of the nonionic surfactant 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, glycerol fatty acid esters, polyglycerol fatty acid esters, sorbitan fatty acid esters, sucrose fatty acid esters, alkyl polyglycosides, alkyl diethanolamides, and alkyl amine oxides.

[0048] Examples of the cationic surfactant include alkylammonium salts, fatty acid amide ammonium salts, monoalkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, trialkyl quaternary ammonium salts, benzalkonium chloride quaternary ammonium salts, benzethonium chloride, and alkylpyridinium salts.

[0049] Among them, anionic surfactants are preferred, ammonium salt-type anionic surfactants such as ammonium lauryl sulfate are more preferred, and alkyl ammonium sulfate surfactants are further preferred. By using such surfactants, the water resistance of the adhesive layer obtained by coating and drying is further improved, and even if water washing is performed by physical means, there is a tendency to further suppress damage to the adhesive layer caused by water washing.

[0050] 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 % relative to the total amount of the aqueous adhesive composition. When the content of the surfactant is within the above range, the water resistance and mechanical strength of the adhesive layer tend to be further improved.

[0051] 1.4. Water

[0052] The content of water is preferably 30 to 80% by mass, 35 to 70% by mass, or 40 to 60% by mass relative to the total amount of the aqueous adhesive composition.

[0053] 1.5. Ammonia and ammonium ions

[0054] The aqueous adhesive composition of the present embodiment preferably contains ammonia or ammonium ions.

[0055] By including an acrylic resin and ammonia and ammonium ions that contribute to adhesion, the stability of the aqueous adhesive composition is improved, and the water resistance and mechanical strength of the resulting adhesive layer tend to be further improved. Since the ammonium salt is no longer a salt and becomes insoluble in water when the adhesive layer is dried, the water resistance is improved. When Na ions and K ions replace ammonium ions, metal ions will not volatilize and water resistance will not be improved.

[0056] Here, the aqueous adhesive composition of the present embodiment further comprises a pH adjuster, and the pH adjuster preferably comprises ammonia. Ammonia can also function as an emulsifying stabilizer. In addition, anionic surfactants, particularly alkyl ammonium sulfate surfactants, can also function as emulsifying dispersants of the aqueous adhesive composition. Thus, even when an aqueous acrylic resin is used, the water resistance of the adhesive layer obtained by coating and drying is further improved, and even if physical means are used and water washing is performed, there is a tendency to suppress the damage to the adhesive layer caused by the water washing.

[0057] The ammonia content is preferably 0.1 to 5.0 mass %, 0.3 to 2.0 mass %, or 0.5 to 3.0 mass % relative to the total amount of the aqueous adhesive composition. When the ammonia content is within the above range, water resistance tends to be further improved. It should be noted that the ammonia content may also include the content of ammonium ions contained in the aqueous adhesive composition.

[0058] The ammonium ion content of the aqueous adhesive composition of the present embodiment is preferably higher than the total content of the sodium ions and the potassium ions. This tends to further improve water resistance.

[0059] The ratio of the content of ammonium ions to the total content of sodium ions and potassium ions in the aqueous adhesive composition of the present embodiment, that is, (ammonium ions) / (sodium ions and potassium ions), is preferably 100 or more. This tends to further improve water resistance.

[0060] From the above viewpoints, (ammonium ion) / (sodium ion and potassium ion) is preferably 140 or more, 180 or more, or 200 or more.

[0061] The (ammonium ion) / (sodium ion and potassium ion) is preferably 350 or less, or 300 or less.

[0062] 1.6. Organic solvents

[0063] From the viewpoint of reducing the environmental burden and the influence on the human body, the aqueous adhesive composition of the present embodiment preferably does not contain an organic solvent. In addition, when an organic solvent is contained, the content of the organic solvent is preferably 5.0 mass % or less, 2.5 mass % or less, or 1.0 mass % or less relative to the total amount of the aqueous adhesive composition. In this way, the environmental burden can be reduced, and the VOC (volatile organic compound) when the aqueous adhesive composition is used can be reduced, so there is a tendency to further improve the working environment.

[0064] It should be noted that the organic solvent of the present embodiment does not contain the above-mentioned amino compound and surfactant.

[0065] 1.7. Pigments

[0066] The aqueous adhesive composition of the present embodiment preferably does not include colorant. In addition, when including colorant, relative to the total amount of the aqueous adhesive composition, the content of the colorant is preferably below 1.0 mass %, below 0.5 mass %, below 0.3 mass %. Thus, the aqueous adhesive composition of the present embodiment is clearly distinguished from compositions such as ink compositions, printing dye pastes, coatings, etc., which are colored for the purpose.

[0067] The aqueous adhesive composition of the present embodiment is an aqueous adhesive composition that forms an adhesive layer on a fabric conveying belt of an inkjet printing device.

[0068] The material of the cloth conveying belt is not particularly limited.

[0069] The cloth conveyor belt may contain, for example, polyurethane resin, polyester, etc., and preferably contains polyurethane resin. When the material constituting the surface of the cloth conveyor belt is polyurethane resin, there is a tendency that the conveying performance is further improved.

[0070] The fabric conveyor belt may be fibrous, and preferably contains polyphenylene ether fibers or aramid fibers. This tends to further improve the mechanical strength of the fabric conveyor belt.

[0071] The pencil hardness of the adhesive layer is preferably HB or more, 2H or more, or 4H or more. This provides excellent strength of the adhesive layer.

[0072] The Mohs hardness of the adhesive layer is preferably not less than 2. This provides excellent strength of the adhesive layer.

[0073] The pencil hardness and Mohs hardness of the adhesive layer can be adjusted by adjusting the amount of the high-strength acrylic resin emulsion (cross-linked acrylic resin emulsion) used.

[0074] 2. Preparation method of water-based adhesive composition

[0075] 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 an acrylic resin emulsion and a crosslinking agent, wherein the adhesive layer formed by the first solution has a greater adhesive strength than the adhesive layer formed by the second solution.

[0076] The first solution including the acrylic resin emulsion may form a higher adhesion adhesive layer compared to the second solution including the acrylic resin emulsion and the cross-linking agent.

[0077] The second solution including the acrylic resin emulsion and the cross-linking agent can form an adhesive layer with higher strength than the first solution including the acrylic resin emulsion.

[0078] By mixing the first solution containing the acrylic resin emulsion and the second solution containing the acrylic resin emulsion and the cross-linking agent, the obtained adhesive layer has excellent transportability to the cloth.

[0079] As the acrylic resin emulsion, a commercially available item can be used, and examples thereof include BPW6441 (produced by Toyo Chemical Co., Ltd.).

[0080] The cross-linking agent is not particularly limited, and examples thereof include CARBODILITE E-02 (manufactured by Nisshinbo Chemical Co., Ltd.).

[0081] The second solution preferably contains ammonia. When the second solution contains an acrylic resin and ammonia that contribute to adhesiveness, the stability of the aqueous adhesive composition is improved, and the water resistance and mechanical strength of the obtained adhesive layer tend to be further improved.

[0082] 3. Inkjet printing and dyeing device

[0083] The inkjet printing device of the present embodiment comprises: a conveying mechanism for bonding a cloth to an adhesive layer formed on the surface of a cloth conveying belt and based on the aqueous adhesive composition of the present embodiment, and for conveying the cloth; a recording unit for performing printing and dyeing recording on the cloth attached to the adhesive layer using an inkjet head; and a cleaning unit for cleaning the adhesive layer of the cloth that has been peeled off after printing and dyeing recording.

[0084] The conveyance mechanism bonds the cloth to the adhesive layer made of the aqueous adhesive composition of the present embodiment formed on the surface of the cloth conveyance belt, and conveys the cloth.

[0085] The method for forming an adhesive layer using the aqueous adhesive composition of the present embodiment includes the step of forming an adhesive layer by attaching the aqueous adhesive composition to the surface of a fabric conveying member of an inkjet printing device.

[0086] The step of forming an adhesive layer is a step of attaching the above-mentioned aqueous adhesive composition to the surface of the fabric conveying member to form an adhesive layer. The method of attaching the aqueous adhesive composition to the fabric conveying member is not particularly limited, and the aqueous adhesive composition may be applied uniformly to the entire surface of the fabric conveying member using a scraper or the like, or may be applied locally to the surface of the fabric conveying member in a predetermined pattern.

[0087] In addition, 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., 20 to 40° C. In addition, the drying time is preferably 1 to 24 hours, 2 to 8 hours. As a result, the water resistance and mechanical strength of the obtained adhesive layer tend to be further improved.

[0088] Reference Figure 1 , the inkjet printing device 100 of this embodiment is described. Figure 1 2 is a diagram showing the overall structure of an inkjet printing device 100 including a conveying device 200 according to this embodiment. Figure 1 In FIG. 1 , arrows a and b indicate the conveying direction of the recording medium 300. Arrows c and d indicate the rotation direction of the cloth conveying member 210. Arrows e and f indicate the rotation direction of the conveying rollers 221 and 222.

[0089] The inkjet printing device 100 may include: a conveying device 200 for conveying a recording medium attached to a surface; recording medium conveying rollers 111 and 112; and a recording unit 120. The recording medium 300 coming from the direction a is pressed against the cloth conveying member 210 by the recording medium conveying roller 111, and the recording medium 300 is attached to the surface of the cloth conveying member 210.

[0090] With the recording medium 300 attached to the surface of the cloth conveying member 210, the recording medium 300 is conveyed by the conveying device 200 to the position directly below the recording unit 120, and the recording unit 120 records on the recording medium 300. Then, the cloth conveying member 210 and the recording medium 300 are separated at the recording medium conveying roller 112.

[0091] The recording unit 120 may eject the ink composition or the like by an inkjet method. In the present embodiment, it is assumed that the recording unit 120 uses an inkjet head to print on a cloth as the recording medium 300, but the present invention is not limited thereto.

[0092] The transport device 200 may include a pair of transport rollers 221 and 222 , a cloth transport member 210 , a drive motor 230 , a control device 240 , a cleaning unit 250 , and a removing member 260 .

[0093] The conveying rollers 221 and 222 are rollers for conveying the fabric conveying member 210 in a certain direction. In addition, the fabric conveying member 210 may be a belt member having an adhesive layer on the surface, which is arranged around the conveying rollers 221 and 222. The fabric conveying member 210 conveys the recording medium in the direction of arrow c by rotating the conveying rollers 221 and 222 by the driving motor 230. The control device 240 can perform control of either or both of the conveying device 200 and the inkjet printing device 100.

[0094] The cleaning unit 250 cleans the surface of the cloth conveying member 210 that has been separated from the recording medium 300. The components of the recording medium 300 and the printing colorant that adhere to the cloth conveying member 210 during printing are cleaned by the cleaning unit 250. The cleaning unit 250 may further include a pump (not shown), a water sprinkling port, and a water sprinkling pipe.

[0095] The removal member 260 removes water attached to the cloth conveying member 210 by the cleaning unit 250. The removal member 260 is not particularly limited, and a scraper can be cited as an example. As a material of the scraper, an elastic raw material is preferred. Moreover, from the viewpoint of wear resistance, polyurethane is preferred. The contact portion with the cloth conveying member 210 may be a rectangular cross-section, but may also be a shape in which the top end is cut obliquely.

[0096] An elastic material is preferably used as the fabric conveying member 210. A heater (not shown) for heating the fabric conveying member 210 may be provided. In the step of washing the fabric conveying member 210, a water receiving portion (not shown) for receiving washing water, a brush (not shown) for cleaning the fabric conveying member 210, a sponge (not shown), etc. may be used.

[0097] Examples of the recording medium 300 include cloth made of natural fibers such as silk, cotton, wool, nylon, polyester, and rayon, or synthetic fibers.

[0098] 4. Fabric conveyor belt for inkjet printing and dyeing equipment

[0099] The fabric conveying belt of the inkjet printing and dyeing device of the present embodiment has an adhesive layer derived from the aqueous adhesive composition of the present embodiment on the surface. The fabric conveying belt is not particularly limited, and for example, an elastic raw material is preferred, and a polyurethane raw material is particularly preferred. By using the above-mentioned aqueous adhesive composition in such a fabric conveying belt, the adhesion between the adhesive layer and the fabric conveying belt is further improved, and the durability is improved.

[0100] 5. Inkjet printing and dyeing method

[0101] The inkjet printing method comprises: a conveying step, in which a cloth is attached to an adhesive layer based on the above-mentioned aqueous adhesive composition formed on the surface of a cloth conveying component (e.g., a cloth conveying belt) of an inkjet printing device, and the cloth is conveyed; a recording step, in which an inkjet head is used to perform printing and recording on the cloth attached to the adhesive layer; and a cleaning step, in which the adhesive layer of the cloth is peeled off after printing and recording.

[0102] 5.1. Transport process

[0103] The conveying step is a step of laminating the fabric to the adhesive layer based on the aqueous adhesive composition formed on the surface of the fabric conveying member of the inkjet printing device and conveying the fabric. The laminating method is not particularly limited, such as Figure 1 As shown, there is a method of pressing the two together using a conveying roller.

[0104] 5.2. Recording process

[0105] The recording process is a process of printing and recording the fabric attached to the adhesive layer using an inkjet head. In the recording process, the fabric conveying member and the fabric are conveyed in close contact via the adhesive layer on the surface of the fabric conveying member, and during the conveying process, ink is ejected from the recording unit 120 to adhere to the fabric. Thereafter, the fabric attached with the ink can be peeled off from the adhesive layer and recovered.

[0106] 5.3. Cleaning process

[0107] The cleaning step is a step of cleaning the adhesive layer of the fabric after printing and recording. Through this step, waste such as thread ends from the fabric that adhered during the recording step can be removed from the surface of the adhesive layer.

[0108] Example

[0109] The present invention will be described in more detail below using Examples and Comparative Examples. The present invention is not limited in any way by the following Examples.

[0110] 1. Preparation of water-based adhesive composition

[0111] Figure 2 Table 1 showing the composition of the aqueous adhesive composition is recorded in the table. Each component is added to a mixture container in a manner to form the composition described in Table 1, and mixed and stirred to obtain the aqueous adhesive composition of each example. It should be noted that in each example in the table, the solid content is the "component amount", which is shown in mass%. In addition, in the "component amount", ammonia water is shown as having an ammonia content of 28% by mass. Regarding other components, the product shown as 100% by mass in the "component amount" does not include solvents, etc.

[0112] In addition, the numerical values ​​in the table are expressed as mass % unless otherwise specified. The components used in Table 1 are as follows.

[0113] Crosslinking agent

[0114] CARBODILITE (registered trademark) E-02 (manufactured by Nisshinbo Chemical Co., Ltd.)

[0115] Acrylic resin

[0116] ・Highly adhesive water-based acrylic emulsion

[0117] A-1 Product name BPW6441 (non-volatile content 50 mass%), produced by Dongyang Chemical Co., Ltd.

[0118] ・High-strength water-based acrylic emulsion

[0119] A-2 A solution obtained by mixing 50 parts by mass of BPW6441 (produced by Toyo Chemical Industry Co., Ltd.) and 1 part by mass of CARBODILITE E-02 (produced by Nisshinbo Co., Ltd.) and crosslinking them at 70°C for 5 hours.

[0120] A-3 A solution obtained by mixing 50 parts by mass of BPW6441, 1 part by mass of CARBODILITE E-02 and 1 part by mass of 28% aqueous ammonia and crosslinking at 70°C for 5 hours.

[0121] A-4 A solution obtained by mixing 50 parts by mass of BPW6441, 1 part by mass of CARBODILITE E-02 and 0.2 parts by mass of a 1% NaOH aqueous solution and crosslinking the mixture at 70°C for 5 hours.

[0122] Surfactants

[0123] Ammonium dodecyl sulfate

[0124] Alkali

[0125] Ammonia (also contains ammonium ions)

[0126] The ammonium ion concentration and the total ion concentration of sodium ions and potassium ions of the aqueous binder 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 Laboratory.

[0127] 2. Evaluation Method

[0128] 2.1. Adhesion

[0129] The 180° pull-off adhesive strength was measured according to JIS Z 0237. Specifically, a 0.2 mm thick adhesive was applied to a 25 mm wide glass slide, and dried for 12 hours in an environment of 50% humidity and 23°C to form an adhesive layer sample. The cotton and the adhesive layer sample were rolled 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.

[0130] 2.2. Pencil hardness

[0131] The pencil hardness of the adhesive layer sample formed as described above was measured by the scratch hardness of JIS5600-5-4 (pencil method with a weight of 500 g). However, when the adhesive has strong adhesion, it may be difficult to press the tester, so the scratch when the tester is stretched was measured.

[0132] 2.3. Mohs hardness

[0133] The Mohs hardness of the adhesive layer sample formed as described above was such that the case where the adhesive layer was scratched by talc having a Mohs hardness of 1 was defined as 1 on the Mohs hardness scale, and the case where the adhesive layer was not scratched by talc was defined as 2 on the Mohs hardness scale.

[0134] 2.4. Water resistance

[0135] 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 worse the water resistance was. The water resistance was evaluated according to the following evaluation criteria based on the degree of whitening.

[0136] Evaluation Criteria

[0137] A: Transparent

[0138] B: Slightly white

[0139] C: Severe bleaching

[0140] 2.5. Transportability

[0141] On the surface of the fabric conveyor belt of the digital dyeing machine MonnaLisa 8000 manufactured by EPSON, the aqueous adhesive composition of the embodiment or comparative example was evenly applied to the entire surface of the fabric conveyor belt using a scraper and dried to form an adhesive layer. It should be noted that the fabric conveyor belt was prepared in two types: one with a surface made of polyurethane raw material and the other with a surface made of polyester raw material.

[0142] The fabric was bonded to the adhesive layer formed on the surface of the fabric conveying belt, and the fabric was conveyed for 10 m, 1000 m, and 10000 m by the conveying mechanism of the inkjet printing device. The conveyance properties were evaluated according to the following evaluation criteria.

[0143] Evaluation Criteria

[0144] A: Complete delivery of cotton and polyester.

[0145] B: The delivery of cotton is completed, but the delivery of polyester is not completed.

[0146] C: Cotton and polyester delivery is complete, but the cloth has adhesive attached.

[0147] D: Delivery of cloth and polyester is not completed.

[0148] E: When being pulled away from the belt, the sheet such as cloth or film is stretched.

[0149] As can be seen from Table 1, excellent results were obtained by the present invention. In contrast, satisfactory results were not obtained by the comparative examples.

Claims

1. A water-based adhesive composition, characterized in that A water-based adhesive composition for forming an adhesive layer on a fabric conveying belt of an inkjet printing device, The aqueous adhesive composition comprises an acrylic resin, The adhesive force 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.

2. The aqueous adhesive composition according to claim 1, characterized in that The ammonium ion content is higher than the combined content of sodium and potassium ions.

3. The aqueous adhesive composition according to claim 1, characterized in that: The ratio of the content of ammonium ions to the total content of sodium ions and potassium ions, that is, ammonium ions / sodium ions and potassium ions, is 100 or more.

4. The aqueous adhesive composition according to claim 1, characterized in that: The fabric conveying belt includes a polyurethane resin.

5. The aqueous adhesive composition according to claim 1, characterized in that: The adhesive layer has a pencil hardness of HB or more.

6. The aqueous adhesive composition according to claim 1, characterized in that: The adhesive layer has a Mohs hardness of 2 or more.

7. The aqueous adhesive composition according to claim 1, characterized in that: The aqueous adhesive composition further comprises a surfactant, The surfactant comprises alkyl ammonium sulfate.

8. The aqueous adhesive composition according to claim 1, characterized in that: The aqueous adhesive composition further comprises a pH adjuster, The pH adjuster includes ammonia.

9. The aqueous adhesive composition according to claim 1, characterized in that: The cloth conveying belt includes polyphenylene ether-based fibers or aramid fibers.

10. A cloth conveying belt for an inkjet printing and dyeing device, characterized in that: The fabric conveying belt of the inkjet printing device has an adhesive layer derived from the aqueous adhesive composition according to any one of claims 1 to 9 on its surface.

11. An inkjet printing and dyeing device, characterized in that: have: A conveying mechanism for conveying the cloth by laminating the cloth to an adhesive layer based on the aqueous adhesive composition according to any one of claims 1 to 9 formed on a surface of a cloth conveying belt; a recording unit that performs printing and dyeing recording on the cloth attached to the adhesive layer using an inkjet head; and The cleaning unit cleans the adhesive layer of the fabric from which the adhesive layer has been peeled off after the printing and recording.

12. A method for preparing an aqueous adhesive composition, characterized in that: A method for producing the aqueous adhesive composition according to any one of claims 1 to 9, The preparation method comprises a mixing step of mixing a first solution containing an acrylic resin emulsion with a second solution containing an acrylic resin emulsion and a cross-linking agent. The adhesive force of the adhesive layer formed from the first solution is greater than the adhesive force of the adhesive layer formed from the second solution.

13. The method for preparing the aqueous adhesive composition according to claim 12, characterized in that: The second solution comprises ammonia.

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