Aqueous adhesive composition, adhesive application method, inkjet printing device, fabric conveying member

Abstract

Provided are: an aqueous adhesive composition capable of forming an adhesive layer having excellent adhesiveness, wear resistance and mechanical characteristics; an adhesiveness imparting method; an inkjet printing device; a fabric conveying member therefor; the aqueous adhesive composition is used for forming an adhesive layer on the surface of a fabric conveying member of an inkjet textile printing device, and contains a (meth) acrylic resin and water. The present invention relates to an acrylic resin composition comprising a first (meth) acrylic resin and a second (meth) acrylic resin having a glass transition temperature (Tg2) lower than the glass transition temperature (Tg1) of the first (meth) acrylic resin, the first (meth) acrylic resin comprising methyl methacrylate or ethyl methacrylate as a constituent unit, the second (meth) acrylic resin comprising methyl methacrylate or ethyl methacrylate as a constituent unit, and the third (meth) acrylic resin comprising methyl methacrylate or ethyl methacrylate as a constituent unit. The total content of methyl methacrylate and ethyl methacrylate is from 10% by mass to 41% by mass (inclusive) with respect to the total of the constituent units of the first (meth) acrylic resin.

Description

Technical Field

[0001] The invention relates to an aqueous adhesive composition. Background Art

[0002] The inkjet recording method can record high-definition images with a relatively simple device, and has achieved rapid development in various aspects. Among them, various studies have been conducted on ejection stability, etc. For example, in Patent Document 1, as a printing and dyeing technology using an inkjet method, a conveying device and an image recording device having a displacement suppression member relative to the conveying member are disclosed for the purpose of stabilizing the contact state between the removal member and the conveying member and improving the recovery performance of the washing water of the removal member.

[0003] Prior art literature

[0004] Patent Literature

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

[0006] As shown in Patent Document 1, in the printing and dyeing technology using the inkjet method, the cloth is attached to a conveying member such as an endless belt and the cloth is conveyed to the printing section. An adhesive is applied to the surface of the conveying member so that the surface of the conveying member has adhesiveness. The adhesive is also called a cloth adhesive.

[0007] The cloth that becomes the recording medium is peeled off from the conveying member after printing and conveyed to the next process. On the other hand, in order to stick the cloth again to the conveying member after the cloth is peeled off, it is necessary to remove the ink, thread ends, and other residual parts attached to the conveying member during the printing process. The residual parts attached to the conveying member are usually washed with water. At this time, a brush, sponge, etc. are sometimes used to clean the conveying member.

[0008] The adhesive used in such inkjet printing and dyeing is usually made of a hydrophobic resin dissolved in an organic solvent to be resistant to water washing. However, in recent years, in order to reduce environmental load and improve the working environment, it is required to reduce the amount of water-based adhesive used in organic solvents. However, water-based adhesives have poor wear resistance, and the adhesiveness of the adhesive disposed on the surface of the conveying member tends to gradually decrease due to washing, and a new adhesive needs to be applied each time after multiple washings. Summary of the invention

[0009] The aqueous adhesive composition of the present invention is used for forming an adhesive layer on the surface of a fabric conveying member of an inkjet printing device, the aqueous adhesive composition comprising a (meth)acrylic resin and water, the (meth)acrylic resin comprising a first (meth)acrylic resin and a second (meth)acrylic resin having a glass transition temperature Tg2 lower than the glass transition temperature Tg1 of the first (meth)acrylic resin, the first (meth)acrylic resin comprising methyl methacrylate or ethyl methacrylate as a constituent unit, and the total content of the methyl methacrylate and the ethyl methacrylate is 10% by mass or more and 41% by mass or less relative to the total content of the constituent units of the first (meth)acrylic resin.

[0010] The method for imparting adhesiveness of the present invention comprises the step of attaching the aqueous adhesive composition to the surface of a fabric conveying member of an inkjet printing device to form an adhesive layer.

[0011] The inkjet printing and dyeing device of the present invention comprises: a conveying mechanism, which adheres the cloth to the adhesive layer formed by the above-mentioned aqueous adhesive composition formed on the surface of the cloth conveying component and conveys it; a recording unit, which uses an inkjet head to perform printing and dyeing records on the above-mentioned cloth adhered to the above-mentioned adhesive layer; and a cleaning unit, which cleans and peels off the above-mentioned adhesive layer of the above-mentioned cloth after the above-mentioned printing and dyeing recording.

[0012] The inkjet printing method of the present invention comprises: a conveying step, in which a cloth is adhered to an adhesive layer formed by the above-mentioned aqueous adhesive composition on the surface of a cloth conveying component of an inkjet printing device and conveyed; a recording step, in which an inkjet head is used to perform printing and dyeing recording on the above-mentioned cloth adhered to the above-mentioned adhesive layer; and a cleaning step, in which the above-mentioned adhesive layer of the above-mentioned cloth is cleaned and peeled off after the above-mentioned printing and dyeing recording. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic cross-sectional view of an inkjet printing device.

[0014] Figure 2 Table 1 shows the compositions of (meth)acrylic resins A to I.

[0015] Figure 3 Table 2 shows the composition of the aqueous adhesive composition.

[0016] Description of Reference Numerals

[0017] 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

[0018] Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the accompanying drawings as needed, but the present invention is not limited thereto and can be variously modified within the scope of the gist thereof. In addition, in the accompanying drawings, the same elements are marked with the same reference numerals and repeated descriptions are omitted. In addition, the positional relationship such as up, down, left, and right is based on the positional relationship shown in the accompanying drawings unless otherwise specified. Furthermore, the dimensional ratios of the accompanying drawings are not limited to the ratios shown in the drawings.

[0019] 1. Water-based adhesive composition

[0020] The aqueous adhesive composition of the present invention (hereinafter also referred to as "aqueous adhesive composition") is an aqueous adhesive composition for forming an adhesive layer on the surface of a fabric conveying member of an inkjet printing device, comprising a (meth)acrylic resin and water, wherein the (meth)acrylic resin comprises a first (meth)acrylic resin and a second (meth)acrylic resin having a glass transition temperature Tg2 lower than the glass transition temperature Tg1 of the first (meth)acrylic resin, wherein the first (meth)acrylic resin comprises methyl methacrylate or ethyl methacrylate as a constituent unit, and the total content of the methyl methacrylate and the ethyl methacrylate is 10% by mass or more and 41% by mass or less relative to the total content of the constituent units of the first (meth)acrylic resin.

[0021] In the conventional inkjet printing device, an adhesive layer is formed on a conveying member such as an endless belt, and a cloth serving as a recording medium is attached to the adhesive layer. The cloth is then conveyed to a printing unit, and after recording is performed, the conveying member and the cloth are peeled off.

[0022] As adhesives for such fabric conveying components, solvent-based acrylic adhesives have been used in the past. However, solvent-based acrylic adhesives volatilize organic solvents when applying the adhesive, so there is concern about adverse effects on the human body in the working environment. In addition, when using solvent-based acrylic adhesives, it is necessary to install an exhaust device in the use environment of the inkjet printing and dyeing device, which makes the overall device structure larger and the cost higher.

[0023] On the other hand, in order to form an adhesive layer by coating an adhesive on a fabric conveying part of an inkjet printing and dyeing device, and to convey the fabric by adhering to the adhesive layer, it is required to have a moderate adhesive force for pasting and peeling the fabric, and at the same time, it is required to have abrasion resistance for washing with water and brushing for removing thread ends and ink attached to the adhesive layer. However, an adhesive layer composed of a water-based adhesive tends to have low abrasion resistance. Therefore, it is difficult to form an adhesive layer that is excellent in abrasion resistance and thus excellent in adhesive force, although it is an adhesive layer composed of a water-based adhesive.

[0024] With regard to the above-mentioned problem, the aqueous adhesive composition of the present embodiment comprises two or more (meth) acrylic resins having different glass transition temperatures and water, and a predetermined amount of methyl methacrylate or ethyl methacrylate is contained in one (meth) acrylic resin, so that the adhesive layer formed by the aqueous adhesive composition of the present embodiment can take into account both adhesive force and wear resistance. Therefore, the adhesive layer functions well as an adhesive layer for bonding the cloth and the cloth conveying component during printing, and in the subsequent cleaning process, damage to the adhesive layer can be suppressed even when washing with water using physical means such as a brush or a sponge. Below, each component contained in the aqueous adhesive composition is described in detail.

[0025] 1.1. (Meth) acrylic resin

[0026] By including a (meth) acrylic resin, the adhesive force and abrasion resistance of the adhesive layer formed on the fabric conveying member are improved. The (meth) acrylic resin may be a water-soluble resin or a resin emulsion dispersed in an aqueous catalyst. In the present embodiment, these are also collectively referred to as (meth) acrylic resins. By using a (meth) acrylic resin, there is a tendency that the environmental burden caused by organic solvents can be reduced, and the peelability of the fabric in the adhesive layer is also improved.

[0027] The (meth)acrylic resin is not particularly limited as long as it is a polymer obtained by polymerizing a (meth)acrylic monomer such as (meth)acrylic acid or (meth)acrylic ester as one component.

[0028] The aqueous adhesive composition comprises a first (meth)acrylic resin and a second (meth)acrylic resin having a glass transition temperature Tg2 lower than the glass transition temperature Tg1 of the first (meth)acrylic resin as the (meth)acrylic resin. By comprising two (meth)acrylic resins having such different glass transition temperatures Tg, the adhesive force and the wear resistance are improved.

[0029] The glass transition temperature Tg1 of the first (meth)acrylic resin may preferably be -25 to 25° C., -20 to 20° C., -15 to 15° C., or -15 to 10° C. When the glass transition temperature Tg1 is within the above range, the adhesive force tends to be further improved.

[0030] The glass transition temperature Tg2 of the second (meth)acrylic resin may preferably be -70 to -15° C., -65 to -20° C., -60 to -25° C., or -55 to -30° C. When the glass transition temperature Tg2 is within the above range, the wear resistance tends to be further improved.

[0031] The difference |Tg1-Tg2| between the glass transition temperature Tg1 and the glass transition temperature Tg2 may preferably be 10 to 50° C., 15 to 45° C., 20 to 40° C., or 25 to 35° C. When the difference |Tg1-Tg2| is within the above range, the adhesive force and the abrasion resistance tend to be further improved.

[0032] The glass transition temperature can be adjusted by the homopolymer glass transition temperature of the polymerizable compound used and the content mass ratio of the polymerizable compound used. The glass transition temperature can be measured by a conventionally known method.

[0033] The first (meth)acrylic resin contains methyl methacrylate (MMA) or ethyl methacrylate (EMA) as a structural unit, and may contain other structural units.

[0034] The total content of methyl methacrylate (MMA) and ethyl methacrylate (EMA) is 10% by mass or more and 41% by mass or less, preferably 12% by mass or more and 40.5% by mass or less, or 15% by mass or more and 40% by mass or less, relative to the total content of the above-mentioned constituent units of the first (meth)acrylic resin. When the total content of methyl methacrylate and ethyl methacrylate contained in the first (meth)acrylic resin is within the above range, the adhesive force and abrasion resistance of the adhesive layer are improved.

[0035] The other constituent units are not particularly limited, and examples thereof include (meth)acrylic monomers having aliphatic groups with 4 or more carbon atoms, such as butyl methacrylate (BMA), butyl acrylate (BA), and 2-ethylhexyl acrylate (2EHA); and (meth)acrylic monomers having aromatic groups, such as styrene (St). In addition, the first (meth)acrylic resin may be a copolymer of a (meth)acrylic monomer and other monomers. The other monomers are not particularly limited, and examples thereof include acrylamide and acrylonitrile.

[0036] The first (meth)acrylic resin preferably contains a (meth)acrylic monomer having a homopolymer glass transition temperature Tg of −40° C. or lower. Such a monomer is not particularly limited, and examples thereof include butyl acrylate (BA) and 2-ethylhexyl acrylate (2EHA).

[0037] The content of such a (meth)acrylic monomer having a Tg of -40°C or less is preferably 30% by mass or more and 60% by mass or less, 35% by mass or more and 55% by mass or less, or 40% by mass or more and 50% by mass or less, relative to the total amount of the above-mentioned structural units of the first (meth)acrylic resin. When the content of the (meth)acrylic monomer having a Tg of -40°C or less is within the above-mentioned range, there is a tendency that the adhesive strength and abrasion resistance of the adhesive layer are further improved.

[0038] The combination of monomers contained in the first (meth)acrylic resin is not particularly limited, and examples thereof include a combination of monomers preferably containing at least ethyl methacrylate, butyl methacrylate, butyl acrylate, and 2-ethylhexyl acrylate; a combination of monomers containing at least ethyl methacrylate, styrene, butyl acrylate, and 2-ethylhexyl acrylate; a combination of monomers containing at least ethyl methacrylate, styrene, butyl methacrylate, butyl acrylate, and 2-ethylhexyl acrylate; and a combination of monomers containing at least methyl methacrylate, butyl methacrylate, and 2-ethylhexyl acrylate. By using the first (meth)acrylic resin containing the above monomers, there is a tendency that the adhesive force and abrasion resistance are further improved.

[0039] The monomer obtained by including the second (meth)acrylic resin as a constituent unit is not particularly limited, and examples thereof include (meth)acrylic monomers having an aliphatic group having 3 or less carbon atoms, such as methyl methacrylate (MMA), ethyl methacrylate (EMA), and n-propyl methacrylate (PMA); (meth)acrylic monomers having an aliphatic group having 4 or more carbon atoms, such as butyl methacrylate (BMA), butyl acrylate (BA), and 2-ethylhexyl acrylate (2EHA); and (meth)acrylic monomers having an aromatic group, such as styrene (St).

[0040] The second (meth)acrylic resin preferably contains a (meth)acrylic monomer having a homopolymer glass transition temperature Tg of 0° C. to 35° C. Such a monomer is not particularly limited, and examples thereof include butyl methacrylate (BMA) and the like.

[0041] The content of the (meth)acrylic monomer having a Tg of 0°C or higher and 35°C or lower is preferably 5% by mass or higher and 35% by mass or lower, 10% by mass or higher and 30% by mass or lower, or 15% by mass or higher and 25% by mass, relative to the total amount of the structural unit of the second (meth)acrylic resin. When the content of the (meth)acrylic monomer having a Tg of 0°C or higher and 35°C or lower is within the above range, the adhesive strength and abrasion resistance of the adhesive layer tend to be further improved.

[0042] The second (meth)acrylic resin preferably contains a (meth)acrylic monomer whose homopolymer has a glass transition temperature Tg of −40° C. or less. Such a monomer is not particularly limited, and examples thereof include butyl acrylate (BA) and 2-ethylhexyl acrylate (2EHA).

[0043] The content of the (meth)acrylic monomer having a Tg of -40°C or less is preferably 55% by mass or more and 85% by mass or less, 60% by mass or more and 80% by mass or less, or 65% by mass or more and 76% by mass or less, relative to the total amount of the structural unit of the second (meth)acrylic resin. When the content of the (meth)acrylic monomer having a Tg of -40°C or less is within the above range, the adhesive strength and abrasion resistance of the adhesive layer tend to be further improved.

[0044] The combination of monomers contained in the second (meth)acrylic resin is not particularly limited, and examples thereof include a combination of monomers preferably containing at least ethyl methacrylate, butyl methacrylate, butyl acrylate, and 2-ethylhexyl acrylate; and a combination of monomers containing at least n-propyl methacrylate, butyl methacrylate, butyl acrylate, and 2-ethylhexyl acrylate. By using the second (meth)acrylic resin containing the above monomers, there is a tendency that the adhesive force and the wear resistance are further improved.

[0045] The content of the first (meth)acrylic resin in the composition is preferably 40% by mass or more, 45% to 85% by mass, 50% to 82% by mass, 55% to 80% by mass, or 60% to 70% by mass relative to the total amount of the first (meth)acrylic resin and the second (meth)acrylic resin. When the content of the first (meth)acrylic resin is within the above range, the adhesive strength and abrasion resistance of the adhesive layer tend to be further improved.

[0046] The content of the second (meth)acrylic resin is preferably less than 60% by mass, 10% to 55% by mass, 15% to 50% by mass, or 20% to 45% by mass relative to the total amount of the first (meth)acrylic resin and the second (meth)acrylic resin. When the content of the second (meth)acrylic resin is within the above range, the adhesive strength and abrasion resistance of the adhesive layer tend to be further improved.

[0047] The content of the (meth) acrylic resin is preferably 20% to 70% by mass, 30% to 60% by mass, 35% to 55% by mass, and 40% to 52% by mass relative to the total amount of the aqueous adhesive composition. When the content of the (meth) acrylic resin is 20% by mass or more, the adhesive force and wear resistance of the obtained adhesive layer tend to be further improved. In addition, when the content of the (meth) acrylic resin is 70% by mass or less, the wear resistance of the obtained adhesive layer tends to be further improved. In addition, the content relative to the total amount of the aqueous adhesive composition refers to the amount of solid components.

[0048] The content of the first (meth)acrylic resin is preferably 10% to 52% by mass, 15% to 45% by mass, or 20% to 40% by mass relative to the total amount of the aqueous adhesive composition. When the content of the first (meth)acrylic resin is within the above range, the adhesive strength and abrasion resistance of the adhesive layer tend to be further improved.

[0049] The content of the second (meth)acrylic resin is preferably 3% to 40% by mass, 5% to 35% by mass, or 7% to 30% by mass relative to the total amount of the aqueous adhesive composition. When the content of the second (meth)acrylic resin is within the above range, the adhesive strength and abrasion resistance of the adhesive layer tend to be further improved.

[0050] 1.2. Adhesion-imparting agent

[0051] The aqueous adhesive composition preferably does not contain or contains a small amount of an adhesiveness-imparting agent. If it does not contain or contains a small amount of an adhesiveness-imparting agent, there is a tendency that the adhesive force and abrasion resistance of the adhesive layer are easily sustained. As such an adhesiveness-imparting agent, for example, rosin compounds, terpene compounds, and hydrocarbon resins can be representatively cited. More specifically, for example, rosin compounds such as natural rosin, modified rosin, glycerol ester of natural rosin, glycerol ester of modified rosin, pentaerythritol ester of natural rosin, and pentaerythritol ester of modified rosin can be cited; copolymers of natural terpenes, three-dimensional polymers of natural terpenes, aromatic modified terpene resins, hydrogenated derivatives of aromatic modified terpene resins, terpene phenolic resins, terpene resins (monoterpene, diterpene, triterpene, polyterpene, etc.); hydrocarbon resins such as aliphatic petroleum hydrocarbon resins (C5 resins), hydrogenated derivatives of aliphatic petroleum hydrocarbon resins, aromatic petroleum hydrocarbon resins (C9 resins), hydrogenated derivatives of aromatic petroleum hydrocarbon resins, styrene oligomers, etc.

[0052] It is preferred that the adhesiveness imparting agent is not contained, but when the adhesiveness imparting agent is contained, its content is preferably less than 5 mass %, less than 4 mass %, less than 3 mass %, less than 2 mass %, and less than 1 mass % relative to the total amount of the aqueous adhesive composition. When the content of the adhesiveness imparting agent is within the above range, there is a tendency that the adhesive force and abrasion resistance of the obtained adhesive layer are easily sustained. From the same viewpoint, the total content of the compound selected from the group consisting of rosin-based compounds, terpene-based compounds and hydrocarbon resins is also preferably within the same range as above.

[0053] 1.3. Water

[0054] The content of water is preferably 30 to 80 mass %, 35 to 70 mass %, or 40 to 60 mass % relative to the total amount of the aqueous adhesive composition.

[0055] 1.4. Surfactants

[0056] The aqueous adhesive composition may contain a surfactant. The surfactant is not particularly limited, and examples thereof include anionic surfactants, nonionic surfactants, and cationic surfactants.

[0057] Examples of the anionic surfactant include alkyl sulfocarboxylates, alkyl diphenyl ether disulfonates, α-olefin sulfonates, polyoxyethylene alkyl ether acetates, N-acylamino acids and salts thereof, N-acylmethyl taurates, alkyl sulfates such as ammonium lauryl sulfate and sodium lauryl sulfate, alkyl sulfate polyoxyalkyl ether sulfates, alkyl sulfate polyoxyethylene alkyl ether phosphates, rosin acid soaps, castor oil sulfate ester salts, lauryl alcohol sulfate ester salts, alkylphenol type phosphate esters, alkyl type phosphate esters, alkyl aryl sulfonates, diethyl sulfosuccinate, diethylhexyl sulfosuccinate, and dioctyl sulfosuccinate.

[0058] 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. Commercially available nonionic surfactants are not particularly limited, and examples thereof include Emulgen 123P, 430, and 1108 (trade names manufactured by Kao Corporation), Newcol 1006, 1008, and 1020 (trade names manufactured by Nippon Emulsifier Co., Ltd.), and Noigen DL-0415, ET-116B, ET-106A, DH-0300, YX-400, and EA-160 (trade names manufactured by Daiichi Kogyo Seiyaku Co., Ltd.).

[0059] Examples of the cationic surfactant include alkylamine salts, fatty acid amide amine salts, monoalkyl quaternary ammonium salts, dialkyl quaternary ammonium salts, trialkyl quaternary ammonium salts, benzalkonium quaternary ammonium salts, benzethonium chloride, and alkylpyridinium salts.

[0060] In the present embodiment, nonionic surfactants are preferred, and more specifically, alkyl ether-based nonionic surfactants are preferred. By using such surfactants, wear resistance tends to be maintained.

[0061] The content of the surfactant is preferably 1 to 7% by mass, 2 to 6% by mass, or 3 to 5% by mass relative to the total amount of the aqueous adhesive composition.

[0062] 1.5. Organic solvents

[0063] From the viewpoint of reducing the environmental load 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, 0.5 mass % or less, or 0.1 mass % or less relative to the total amount of the aqueous adhesive composition. Thus, the environmental load 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] 1.6. Pigment

[0065] The aqueous adhesive composition of the present embodiment preferably does not include colorant. In addition, when colorant is included, the content of the colorant is preferably below 1.0 mass %, below 0.5 mass %, or below 0.3 mass % relative to the total amount of the aqueous adhesive composition. Thus, the aqueous adhesive composition of the present embodiment is clearly distinguished from compositions such as ink compositions, printing and dyeing pastes, and coatings that are intended for coloring.

[0066] 1.7. Storage modulus

[0067] The aqueous adhesive composition of this embodiment is used to form an adhesive layer on the surface of a fabric conveying member of an inkjet printing device. The adhesive layer obtained by this embodiment has excellent adhesive force and abrasion resistance.

[0068] The storage modulus of the adhesive layer of the present embodiment at 23°C is preferably 1.4×10 5 ~5.0×10 5 Pa, 1.6×10 5 ~4.8×10 5 Pa, 2.0×10 5 ~4.5×10 5 Pa. The above storage modulus is 1.5×10 5Pa or more, the wear resistance tends to be further improved.

[0069] The method for forming the adhesive layer for measuring the storage modulus is not particularly limited. For example, the aqueous adhesive composition is applied to a 25 mm wide slide glass at room temperature to a thickness of 0.2 mm and dried at 50% humidity and 23° C. for 8 hours.

[0070] When an adhesive layer composed of only the first (meth) acrylic resin (hereinafter referred to as the "first acrylic adhesive layer") is formed by the same method as the aqueous adhesive composition, the storage modulus of the first acrylic adhesive layer at 23° C. is not particularly limited, but is preferably 3.0×10 5 Above, 4.0×10 5 Above, 5.0×10 5 Above, 6.0×10 5 In addition, the storage modulus is preferably 9.0×10 5 Pa or less, 8.5×10 5 Pa or less, 8.0×10 5 When the storage elastic modulus of the first acrylic adhesive layer is within the above range, the adhesive force and abrasion resistance of the adhesive layer tend to be further improved.

[0071] 1.8. Adhesion

[0072] The adhesive strength of the adhesive layer at 23° C. is preferably 0.3 N / 50 mm to 3.0 N / 50 mm, 0.5 N / 50 mm to 2.0 N / 50 mm, or 0.7 N / 50 mm to 1.8 N / 50 mm. The adhesive strength at 23° C. within the above range exhibits good adhesive strength of the adhesive layer.

[0073] 2. Adhesion imparting method

[0074] The method for imparting adhesiveness according to the present embodiment includes the step of attaching the aqueous adhesive composition to the surface of a fabric conveying member of an inkjet printing device to form an adhesive layer.

[0075] 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 uniformly applied to the entire surface of the fabric conveying member using a scraper or the like, or may be applied to a portion of the surface of the fabric conveying member in a predetermined pattern.

[0076] 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. Thus, there is a tendency that the water resistance and mechanical strength of the obtained adhesive layer are further improved, and the wear resistance is further improved.

[0077] 3. Inkjet printing and dyeing device

[0078] The inkjet printing device of this embodiment comprises: a conveying mechanism for attaching a cloth to an adhesive layer formed by the above-mentioned aqueous adhesive composition formed on the surface of a cloth conveying member and conveying the cloth; a recording unit for performing printing and dyeing records on the cloth attached to the adhesive layer using an inkjet head; and a cleaning unit for cleaning and peeling off the adhesive layer of the cloth after printing and dyeing recording.

[0079] Reference Figure 1 , the inkjet printing device 100 of this embodiment is described. Figure 1 2 is an overall structural diagram 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 .

[0080] The inkjet printing device 100 may also include a conveying device 200 for conveying a recording medium by attaching it to a surface, recording medium conveying rollers 111 and 112, and a recording unit 120. The recording medium 300 conveyed 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.

[0081] With the recording medium 300 attached to the surface of the cloth conveying member 210, the recording medium 300 is conveyed to the position directly below the recording unit 120 by the conveying device 200, and the recording unit 120 records on the recording medium 300. Thereafter, the cloth conveying member 210 and the recording medium 300 are separated by the recording medium conveying roller 112.

[0082] The recording unit 120 may eject the ink composition etc. by inkjet method. In the present embodiment, it is assumed that the recording unit 120 uses an inkjet head of an inkjet method to print on a textile cloth as the recording medium 300, but the present invention is not limited thereto.

[0083] 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 .

[0084] 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 also 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 rotates the conveying rollers 221 and 222 by driving the motor 230, thereby conveying the recording medium in the direction of the arrow c. The control device 240 may also control either or both of the conveying device 200 and the inkjet printing device 100.

[0085] The cleaning unit 250 cleans the surface of the cloth conveying member 210 after being separated from the recording medium 300. The components of the recording medium 300 and the printing colorant attached to the cloth conveying member 210 during printing are cleaned by the cleaning unit 250. The cleaning unit 250 may also include a pump (not shown), a water spray port, and a water spray pipe.

[0086] 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 for the scraper, an elastic material is preferred. Furthermore, 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 front end is cut off obliquely.

[0087] 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.

[0088] The recording medium 300 may be a cloth made of natural fibers or synthetic fibers such as silk, cotton, wool, nylon, polyester, and rayon. The cloth may be a woven fabric, a knitted fabric, or a nonwoven fabric.

[0089] 4. Fabric conveying parts of inkjet printing and dyeing equipment

[0090] The fabric conveying component of the inkjet printing and dyeing device of this embodiment has an adhesive layer from the above-mentioned aqueous adhesive composition on the surface. The fabric conveying component is not particularly limited, for example, an elastic material is preferred, and a polyurethane material is particularly preferred. By using the above-mentioned aqueous adhesive composition using a polyurethane resin and an acrylic resin in such a fabric conveying component, the close contact between the adhesive layer and the fabric conveying component is further improved, and the wear resistance is improved.

[0091] 5. Inkjet printing and dyeing method

[0092] The inkjet printing method comprises: a conveying step of attaching a cloth to an adhesive layer formed by the above-mentioned aqueous adhesive composition on the surface of a cloth conveying component of an inkjet printing device and conveying the cloth; a recording step of performing printing and recording on the cloth attached to the adhesive layer using an inkjet head; and a cleaning step of cleaning and peeling off the adhesive layer of the cloth after printing and recording.

[0093] 5.1. Transport process

[0094] The conveying step is a step of laminating the fabric to the adhesive layer 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 both together using a conveying roller.

[0095] 5.2. Recording process

[0096] The recording step is a step of printing and recording the fabric attached to the adhesive layer using an inkjet head. In the recording step, the fabric is conveyed in a state where the fabric conveying member and the fabric are in close contact through 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. Then, the fabric attached with the ink can be peeled off from the adhesive layer and recovered.

[0097] 5.3. Cleaning process

[0098] The cleaning process is a process of cleaning the adhesive layer of the stripped cloth after printing and recording. Through this process, garbage such as thread ends from the cloth attached in the recording process can be removed from the surface of the adhesive layer.

[0099] Example

[0100] Hereinafter, the present invention will be described in more detail using Examples and Comparative Examples. The present invention is not limited to the following Examples at all.

[0101] 1. Synthesis of (meth)acrylic resins A to I

[0102] exist Figure 2 Table 1 showing the compositions of the (meth)acrylic resins A to I is shown in FIG.

[0103] 114 g of ion exchange water was added to a reactor equipped with a stirrer, a reflux condenser, a thermometer, a nitrogen inlet tube, and a dropping funnel, and the temperature was raised to 82°C. Thereafter, a total of 498 g of monomers, 79 g of ion exchange water, and 34 g of Emulgen 123P (surfactant, trade name, manufactured by Kao Corporation) having a composition ratio as described in Table 1 below were added and mixed and stirred. 249 g of a 2% by mass aqueous solution of ammonium persulfate as a polymerization initiator was added to the homogenized solution at 82°C for 1.5 hours. After keeping the temperature for 1 hour from the addition of all the above-described species, the mixture was cooled, and the pH was adjusted to 8 or more and 9 or less with ammonia water while adding ion exchange water. The coarse particles were removed by filtering with a 150-mesh nylon filter to obtain the aqueous dispersions of (meth) acrylic resins A to I described in Table 1. In Table 1, "MMA" means "methyl methacrylate", "EMA" means "ethyl methacrylate", "PMA" means "n-propyl methacrylate", "St" means "styrene", "BMA" means "butyl methacrylate", "BA" means "butyl acrylate", and "2EHA" means "2-ethylhexyl acrylate", and the glass transition temperature Tg (°C) of each homopolymer is shown below the item. In addition, the amount of each homopolymer used in the table is expressed by mass % with the solid content as the component amount.

[0104] 2. Production of aqueous adhesive composition

[0105] exist Figure 3 Table 2 showing the composition of the aqueous adhesive composition is described in.

[0106] First, the aqueous dispersions of the (meth)acrylic resins A to I obtained above were mixed in the following combination of components 1 and 2. Then, the components were added to a mixture container so that the (meth)acrylic resins of components 1 and 2 were 47.8% by mass (total amount in terms of solid content), water was 48.7% by mass, and Emulgen 123P (surfactant, trade name, manufactured by Kao Corporation) was 3.5% by mass (total 100% by mass), and mixed and stirred to obtain an aqueous adhesive composition. The types of (meth)acrylic resins used and their component ratios, the measured glass transition temperatures Tg (°C) of each resin, and the evaluation results of the storage modulus, adhesive force, and wear resistance of the obtained aqueous adhesive composition are shown in Table 2. In addition, in Example 9, (meth)acrylic resin J was used alone, and the glass transition temperatures Tg of each component were measured by differential scanning calorimetry (DSC) according to JIS K7121.

[0107] 3. Measurement and evaluation methods

[0108] Storage modulus

[0109] The resin of component 1 of each example in Table 2 and the obtained aqueous adhesive composition were applied to a 25 mm wide slide glass with a thickness of 0.2 mm, and dried under the conditions of 50% humidity, 23° C., and 8 hours to obtain an adhesive layer. The storage modulus of the adhesive layer at 23° C. was measured using the following viscoelasticity measuring device. In addition, a sample cut into 1 cm×1 cm was used as a measurement sample.

[0110] Device: MCR302 (made by Anton Parr)

[0111] Fixture: 8mm parallel plate

[0112] Gap range: 0.6~1.0mm

[0113] Frequency: 1.0Hz

[0114] Deformation rate: 0.2%

[0115] Temperature: 23℃

[0116] 3.2. Adhesion

[0117] The aqueous adhesive composition obtained above was applied to a 25 mm wide slide glass at a thickness of 0.2 mm, and dried under the conditions of 25% humidity, 50° C., and 30 minutes to form an adhesive layer, and a 50 mm wide cotton and the adhesive layer were roller pressed at a pressure of 1 kgf / 50 mm, and the resultant was subjected to 180 degree peeling force measurement. The measurement was performed at 23° C.

[0118] (Evaluation criteria)

[0119] ○: 1.0N / 50mm or more and less than 2.0N / 50mm

[0120] △: 0.5N / 50mm or more and less than 1.0N / 50mm

[0121] ×: less than 0.5N / 50mm

[0122] 3.3. Wear resistance

[0123] A nylon brush moistened with water was rotated at 200 rpm and pressed against the adhesive layer formed in the above manner at a pressure of 1.0 N / cm, and the surface of the adhesive layer was visually checked after 200 hours for judgment. In addition, as the nylon brush, a nylon brush made of 6·10 nylon, with a bristle diameter of 0.3 mm, a bristle length of 30 mm, and a brush diameter of 16 mm was used.

[0124] (Evaluation criteria)

[0125] 0: No damage

[0126] △: Minor damage

[0127] ×: Concavity and convexity are observed

[0128] 4. Evaluation results

[0129] The composition and evaluation results of the aqueous adhesive composition used in each example are shown in Table 2. As can be seen from Table 2, the aqueous adhesive composition for forming an adhesive layer on the surface of a fabric conveying member of an inkjet printing device comprises a (meth)acrylic resin and water, and the (meth)acrylic resin comprises a first (meth)acrylic resin and a second (meth)acrylic resin having a glass transition temperature Tg2 lower than the glass transition temperature Tg1 of the first (meth)acrylic resin, and the first (meth)acrylic resin comprises methyl methacrylate or ethyl methacrylate as a constituent unit, and when the total content of the methyl methacrylate and the ethyl methacrylate is 10% by mass or more and 41% by mass or less relative to the total content of the constituent units of the first (meth)acrylic resin, the adhesive layer obtained has excellent adhesiveness and abrasion resistance.

Claims

1. An aqueous adhesive composition, characterized in that Used to form an adhesive layer on the surface of a fabric conveying component of an inkjet printing device. The aqueous adhesive composition comprises a (meth)acrylic resin and water, The (meth)acrylic resin includes a first (meth)acrylic resin and a second (meth)acrylic resin, wherein the second (meth)acrylic resin has a glass transition temperature Tg2 lower than a glass transition temperature Tg1 of the first (meth)acrylic resin, The first (meth)acrylic resin contains methyl methacrylate or ethyl methacrylate as a constituent unit, The total content of the methyl methacrylate and the ethyl methacrylate is 10% by mass or more and 41% by mass or less relative to the entire constituent units of the first (meth)acrylic resin.

2. The aqueous adhesive composition according to claim 1, wherein The content of the first (meth)acrylic resin is 50% by mass or more and 82% by mass or less relative to the total amount of the first (meth)acrylic resin and the second (meth)acrylic resin.

3. The aqueous adhesive composition according to claim 1, wherein The storage modulus of the layer formed of the first (meth)acrylic resin at 23° C. is 4.0×10 5 Pa or above.

4. The aqueous adhesive composition according to claim 1, wherein The total content of the compound selected from the group consisting of rosin-based compounds, terpene-based compounds, and hydrocarbon resins is 5% by mass or less based on the total amount of the aqueous adhesive composition.

5. The aqueous adhesive composition according to claim 1, wherein The adhesive force of the adhesive layer at 23° C. is 0.5 N / 50 mm or more and 2.0 N / 50 mm or less.

6. The aqueous adhesive composition according to claim 1, wherein The content of the organic solvent is 5.0% by mass or less based on the total amount of the aqueous adhesive composition.

7. The aqueous adhesive composition according to claim 1, wherein The content of the colorant is 1.0 mass % or less relative to the total amount of the aqueous adhesive composition.

8. A method for imparting adhesion, characterized in that: The method comprises the step of forming an adhesive layer by attaching the aqueous adhesive composition according to any one of claims 1 to 7 to the surface of a fabric conveying member of an inkjet printing device.

9. An inkjet printing and dyeing device, characterized in that: have: A conveying mechanism for conveying a cloth by bonding it to an adhesive layer formed on a surface of a cloth conveying member, wherein the adhesive layer is formed from the aqueous adhesive composition according to any one of claims 1 to 7; 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 after the printing and recording.

10. A cloth conveying component of an inkjet printing and dyeing device, characterized in that: The adhesive layer made from the aqueous adhesive composition according to any one of claims 1 to 7 is provided on the surface.

11. An inkjet printing method, characterized in that: have: A conveying step of laminating the fabric to an adhesive layer formed on a surface of a fabric conveying member of an inkjet printing device and conveying the fabric, wherein the adhesive layer is formed from the aqueous adhesive composition according to any one of claims 1 to 7; a recording step of performing printing and dyeing recording on the cloth attached to the adhesive layer using an inkjet head; and A cleaning step of cleaning the adhesive layer of the fabric after the printing and recording.

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