Pretreatment agent for inkjet printing and inkjet printing method

Abstract

A pretreatment agent for inkjet textile printing, which contains an N-vinylformamide-based cationic polymer and an organic solvent, and wherein the organic solvent is a protic polar solvent. A pretreatment agent for inkjet textile printing, which contains an N-vinylformamide-based cationic polymer and a humectant, and which is characterized in that the boiling point of the humectant is 180 DEG C or higher. Also disclosed is an inkjet printing method which comprises pretreating a textile fabric with the pretreatment agent for inkjet printing, and performing inkjet printing on the pretreated region of the pretreated textile fabric without drying the pretreated textile fabric.

Description

Technical Field

[0001] The present invention relates to a pretreatment agent for inkjet dyeing and an inkjet dyeing method. Background Art

[0002] Compared with the existing method using printing plates, inkjet printing has the following advantages: there is no need to wash or store the printing plates, it is easy to apply to multiple varieties, and the delivery time can be shortened. However, the equipment and ink for inkjet printing are expensive, and a pre-treatment process is required. Patent documents 1 to 3 disclose a technology of applying a pre-treatment agent to a fabric, drying it, and then performing inkjet printing. Patent documents 4 and 5 disclose a technology of applying a pre-treatment agent to a fabric, and then performing inkjet printing without drying it. [Prior art literature] [Patent Document]

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 11-302987 Patent Document 2: Japanese Patent Application Publication No. 2003-3385 Patent Document 3: Japanese Patent Application Laid-Open No. 9-279487 Patent Document 4: JP 2017-530269 Patent Document 5: Japanese Patent Application Publication No. 2016-089288 Summary of the invention [Problems to be solved by the invention]

[0004] The method of drying after applying the pretreatment agent as described in Patent Documents 1 to 3 requires space for a dryer, energy and cost for drying, and has low productivity compared to the method without drying. Therefore, it is sought to perform inkjet printing (dying and printing) without drying after applying the pretreatment agent. However, as described in Patent Documents 4 and 5, the method of applying the pretreatment agent without drying has the problem that the ink easily bleeds due to the capillary phenomenon, and the permeability of the ink into the fabric becomes poor.

[0005] The inventors have found that by using a specific cationic polymer in a pre-treatment agent, the cationic polymer and the negatively charged dye attract each other in printing without drying, and the dye can be fixed in a desired position to prevent bleeding. However, the pre-treatment agent containing the cationic polymer has a high viscosity and is easy to dry, so it is difficult to apply by inkjet. That is, for example, the high viscosity pre-treatment agent solidifies at the front end of the inkjet head, resulting in undesirable conditions such as head clogging.

[0006] In order to pass through inkjet printing, consider reducing the cationic polymer concentration, reduce the viscosity of pre-treating agent. However, when reducing the cationic polymer concentration, the anti-seepage effect based on the cationic polymer is reduced. In this case, in order to obtain sufficient effect, it is necessary to repeatedly apply the pre-treating agent.

[0007] The object of the present invention is to provide a pretreatment agent for inkjet printing and an inkjet printing method. Since the pretreatment agent contains a cationic polymer, inkjet printing can be performed without drying after the pretreatment agent is applied, thereby achieving a pretreatment agent with improved productivity, low cost, energy saving and space saving, excellent anti-seepage effect, and can be stably applied by inkjet. [Methods used to solve the problem]

[0008] The present inventors have studied a pretreatment agent containing a specific cationic polymer and have found that the pretreatment agent becomes difficult to dry by containing a specific organic solvent or a moisturizing agent, and inkjet printing can be stably performed without reducing the concentration of the cationic polymer.

[0009] The present invention has the following aspects.

[0010] [1] A pretreatment agent for inkjet printing, comprising an N-vinylformamide-based cationic polymer and an organic solvent, wherein the organic solvent is a protic polar solvent.

[0011] [2] The pretreatment agent for inkjet textile printing according to [1], wherein the boiling point of the protic polar solvent is 180° C. or higher.

[0012] [3] The pretreatment agent for inkjet textile printing according to [1] or [2], wherein the boiling point of the protic polar solvent is 300° C. or less.

[0013] [4] The pretreatment agent for inkjet textile printing according to any one of [1] to [3], wherein the content of the protic polar solvent in 100% by mass of the total mass of the pretreatment agent for inkjet textile printing is 5% by mass or more and 50% by mass or less.

[0014] [5] A pretreatment agent for inkjet printing, comprising an N-vinylformamide-based cationic polymer and a humectant, wherein the humectant has a boiling point of 180° C. or higher.

[0015] [6] The pretreatment agent for inkjet textile printing according to [5], wherein the boiling point of the moisturizing agent is 300° C. or less.

[0016] [7] The pretreatment agent for inkjet textile printing according to [5] or [6], wherein the moisturizing agent is a protic polar solvent.

[0017] [8] The pretreatment agent for inkjet textile printing according to any one of [5] to [7], wherein the content of the moisturizing agent is 5% by mass or more and 50% by mass or less in 100% by mass of the total mass of the pretreatment agent for inkjet textile printing.

[0018] [9] The pretreatment agent for inkjet textile printing according to any one of [1] to [4], [7] or [8], wherein the SP value of the protic polar solvent is 18.0 MPa 1 / 2 above.

[0019]

[10] The pretreatment agent for inkjet textile printing according to any one of [1] to [4] or any one of [7] to [9], wherein the protic polar solvent is a polyol.

[0020]

[11] The pretreatment agent for inkjet textile printing according to any one of [1] to

[10] , further comprising a defoaming agent.

[0021]

[12] The pretreatment agent for inkjet textile printing according to

[11] , wherein the defoaming agent is a silicone-based defoaming agent.

[0022]

[13] The pretreatment agent for inkjet textile printing according to any one of [1] to

[12] , wherein the cationicity of the N-vinylformamide-based cationic polymer is 2.0 meq / g or more and 8.0 meq / g or less.

[0023]

[14] The pretreatment agent for inkjet textile printing according to any one of [1] to

[13] , wherein the N-vinylformamide-based cationic polymer contains one or more selected from polyamidine and polyvinylamine.

[0024]

[15] The pretreatment agent for inkjet printing according to any one of [1] to

[14] , wherein the content of the N-vinylformamide-based cationic polymer is 0.1% by mass or more and 5.0% by mass or less as a solid content relative to 100% by mass of the total mass of the pretreatment agent.

[0025]

[16] An inkjet printing method comprising: A fabric is pretreated with the pretreatment agent for inkjet printing described in any one of [1] to

[15] , and inkjet printing is performed on the pretreated area of ​​the pretreated fabric without drying the pretreated fabric.

[0026]

[17] The inkjet printing method according to

[16] , wherein the pretreatment agent for inkjet printing is ejected onto the fabric by inkjet.

[0027]

[18] The inkjet printing method according to

[16] or

[17] , wherein the ink used in the inkjet printing is a disperse dye.

[0028]

[19] A pre-treatment agent for inkjet printing and dyeing, which is a pre-treatment agent for inkjet printing and dyeing ejected by an inkjet, It contains an N-vinylformamide-based cationic polymer.

[0029]

[20] A pretreatment agent for inkjet printing, comprising an N-vinylformamide-based cationic polymer and having a viscosity of 1.0 mPa·s to 30 mPa·s.

[0030]

[21] A pretreatment agent for inkjet printing, comprising an N-vinylformamide-based cationic polymer and having a surface tension of 10 mN / m to 80 mN / m.

[0031]

[22] The pretreatment agent for inkjet textile printing according to any one of

[19] to

[21] , wherein the pretreatment agent for inkjet textile printing further contains an organic solvent, and the organic solvent is a protic polar solvent.

[0032]

[23] An inkjet printing method comprising: Pre-treatment step: jetting a pre-treatment agent containing an N-vinyl formamide-based cationic polymer onto the fabric to perform pre-treatment; and Printing process: inkjet printing is performed on the pre-treated area of ​​the pre-treated fabric. [Effects of the Invention]

[0033] According to the pretreatment agent for inkjet printing and the inkjet printing method of the present invention, in the inkjet printing of fabrics, after the pretreatment agent is applied, inkjet printing can be performed without drying the pretreated fabric, and the anti-seepage effect is excellent, and no undesirable conditions such as clogging of the inkjet head will occur, and inkjet printing can be performed smoothly and stably. DETAILED DESCRIPTION

[0034] Hereinafter, the pretreatment agent for inkjet textile printing of the present invention (hereinafter also simply referred to as "pretreatment agent") is described in detail. The description of the constituent elements described below may be based on representative embodiments of the present invention, but the present invention is not limited to such embodiments.

[0035] [Pretreatment agent] The pretreatment agent according to the first embodiment of the present invention is characterized by containing an N-vinylformamide-based cationic polymer and an organic solvent, wherein the organic solvent is a protic polar solvent. The pretreatment agent according to the second embodiment of the present invention is characterized by containing an N-vinylformamide-based cationic polymer and a moisturizing agent having a boiling point of 180° C. or higher.

[0036] Since the pretreatment agent of the present invention contains an N-vinylformamide-based cationic polymer and a protic polar solvent or a moisturizing agent having a boiling point above a specific value, the pretreatment agent is difficult to dry and the viscosity of the pretreatment agent can be reduced without reducing the concentration of the cationic polymer.

[0037] It is considered that the protic polar solvent can also contribute to the anti-bleeding effect by the fixation effect based on the solvation with the dye as described later. Therefore, in the first embodiment of the present invention, a protic polar solvent is used as the organic solvent. Therefore, according to the pretreatment agent of the first embodiment of the present invention containing a protic polar solvent, inkjet printing can be performed smoothly and stably, and a sufficient anti-bleeding effect can be obtained.

[0038] In addition, it is considered that the moisturizing agent can also contribute to preventing seepage when the boiling point of the moisturizing agent is higher than a specific value. Therefore, in the second embodiment of the present invention, a moisturizing agent with a boiling point of 180° C. or higher that is less likely to bleed out is used. Thus, according to the pretreatment agent of the second embodiment of the present invention containing the moisturizing agent having a boiling point of 180° C. or higher, inkjet printing can be performed smoothly and stably, and a sufficient anti-bleeding effect can be obtained.

[0039] The pretreatment agent of the present invention may further contain a defoaming agent, a paste agent, and a thickening agent. The pretreatment agent of the present invention may contain an optional component such as water.

[0040] From the viewpoint of the anti-seepage effect, the viscosity of the pre-treatment agent is preferably 1.0 mPa·s or more, more preferably 2.0 mPa·s or more, and further preferably 3.0 mPa·s or more. On the other hand, from the viewpoint of inkjet ejection properties, the viscosity of the pre-treatment agent is preferably 30 mPa·s or less, more preferably 20 mPa·s or less, further preferably 10 mPa·s or less, and particularly preferably 6.0 mPa·s or less. The above upper and lower limits may be combined arbitrarily. For example, the viscosity of the pretreatment agent is preferably 1.0 mPa·s to 30 mPa·s, more preferably 2.0 mPa·s to 20 mPa·s, further preferably 3.0 mPa·s to 10 mPa·s, and particularly preferably 3.0 mPa·s to 6.0 mPa·s. Therefore, a pretreatment agent according to another embodiment of the present invention is characterized in that it contains an N-vinylformamide-based cationic polymer and has a viscosity of 1.0 mPa·s to 30 mPa·s. The viscosity of the pretreatment agent can be measured using, for example, an E-type viscometer (TVE-25L, manufactured by Toki Sangyo Co., Ltd.).

[0041] From the viewpoint of the anti-seepage effect, the surface tension of the pre-treatment agent is preferably 10 mN / m or more, more preferably 20 mN / m or more, and further preferably 25 mN / m or more. On the other hand, from the viewpoint of inkjet ejection properties, the surface tension of the pre-treatment agent is preferably 80 mN / m or less, more preferably 60 mN / m or less, further preferably 50 mN / m or less, and particularly preferably 40 mN / m or less. The above upper and lower limits may be combined arbitrarily. For example, the surface tension of the pretreatment agent is preferably 10 mN / m or more and 80 mN / m or less, more preferably 20 mN / m or more and 60 mN / m or less, further preferably 25 mN / m or more and 50 mN / m or less, and particularly preferably 25 mN / m or more and 40 mN / m or less. Therefore, a pretreatment agent according to another embodiment of the present invention is characterized in that it contains an N-vinylformamide-based cationic polymer and has a surface tension of 10 mN / m to 80 mN / m. The surface tension of the pretreatment agent can be measured by the Wilhelmy method using a surface tensiometer (DY-700, manufactured by Kyowa Interface Science Co., Ltd.), for example.

[0042] <Coagulant> The pretreatment agent of the present invention contains an N-vinylformamide-based cationic polymer. The N-vinylformamide-based cationic polymer has a function as a coagulant, that is, has a function of aggregating the dye.

[0043] The pretreatment agent of the present invention may contain a coagulant other than the N-vinylformamide-based cationic polymer. The coagulant other than N-vinylformamide-based cationic polymers is not particularly limited as long as it has the function of aggregating the dye, and examples thereof include organic acids, polyvalent metal salts, cationic low molecular weight compounds, and cationic polymers other than N-vinylformamide-based cationic polymers.

[0044] Examples of the organic acid include formic acid, acetic acid, propionic acid, butyric acid, tartaric acid, citric acid, and lactic acid.

[0045] As the polyvalent metal salt, a compound consisting of a metal ion having a valence of more than two and an anion can be used. As the metal ion having a valence of more than two, ions such as calcium, magnesium, aluminum, titanium, strontium, and iron can be listed. As the anion, chloride ion, bromide ion, nitrate ion, sulfate ion, carbonate ion, hydroxide ion, etc. can be listed.

[0046] Examples of the cationic low molecular weight compound include (2-hydroxyethyl)trimethylammonium chloride, benzoylcholine chloride, benzyltriethylammonium chloride, trimethylacetylhydrazine ammonium chloride, 1-butyl-1-methylpyrrolidine chloride, 3-hydroxy-4-(trimethylammonio)butyric acid hydrochloride, glycidyltrimethylammonium chloride, and L-carnitine hydrochloride.

[0047] Examples of the cationic polymer other than the N-vinylformamide-based cationic polymer include polydiallyldimethylammonium chloride, polyallylamine or its derivatives, amine-epihalohydrin copolymers, and other quaternary ammonium salt-type cationic polymers.

[0048] (N-vinyl formamide-based cationic polymer) The pretreatment agent of the present invention contains an N-vinylformamide-based cationic polymer. The N-vinylformamide-based cationic polymer is a cationic polymer obtained by polymerization of N-vinylformamide, and has an effect of enhancing the adhesion of ink to fabrics. Therefore, a pretreatment agent according to another embodiment of the present invention is a pretreatment agent for inkjet printing by inkjet ejection, characterized in that it contains an N-vinylformamide-based cationic polymer. The effect of enhancing the adhesion of ink is related to the degree of cationicity.

[0049] The N-vinylformamide-based cationic polymer is not particularly limited, and examples thereof include polyamidine and polyvinylamine. The polyamidine can be obtained by copolymerization of acrylonitrile and N-vinylformamide. As the N-vinylformamide-based cationic polymer, only one type may be used, or two or more types may be used in combination. As the N-vinylformamide-based cationic polymer, it is preferred that the polymer contain at least one selected from polyamidine and polyvinylamine.

[0050] The cationic degree of the N-vinylformamide cationic polymer is preferably 8.0 meq / g or less, more preferably 7.8 meq / g or less, further preferably 6.0 meq / g or less, and particularly preferably 5.5 meq / g or less. On the other hand, from the viewpoint that the addition amount is within an appropriate range, the cationic degree of the N-vinylformamide cationic polymer is preferably 2.0 meq / g or more, more preferably 4.0 meq / g or more, further preferably 4.5 meq / g or more. Particularly preferably 5.0 meq / g or more. The above upper and lower limits can be combined arbitrarily. For example, the cationic degree of the N-vinylformamide-based cationic polymer is preferably 2.0 meq / g or more and 8.0 meq / g or less, more preferably 4.0 meq / g or more and 7.8 meq / g or less, further preferably 4.5 meq / g or more and 6.0 meq / g or less, and particularly preferably 5.0 meq / g or more and 5.5 meq / g or less.

[0051] Herein, the cationicity of the cationic polymer is a value defined as follows. (Determination of Cationicity of Cationic Polymers) The cationicity of the cationic polymer can be determined as follows. In a 100 ml volumetric flask (accurately weighed), sample about 0.4 g of cationic polymer and add deionized water to the scale of 100 ml (A solution). Collect 5 ml from A solution and add deionized water to 200 ml, then adjust the pH to 2.5 with 0.1N HCl aqueous solution. Then, add 3 drops of toluidine blue and titrate with 1 / 400N-PVSK (polyvinyl potassium sulfate) solution until the color of the modulated solution changes from blue to red. Also perform a blank test in the same way and calculate the cationic degree according to the following formula. {(1 / 400)×(PVSK solution factor)×(titration amount (ml)-blank titration amount (ml))×(100 / 5)} / {(sampling amount (g))×(polymer concentration)}

[0052] As N-vinylformamide-based cationic polymers, commercial products can be used. As commercial products of polyamidine, PVADL (manufactured by Mitsubishi Chemical Corporation), SC-700, SC-700L (manufactured by Hymo Corporation) can be exemplified. As commercial products of polyvinylamine, PVAM 0570B, PVAM 0595B, KP 8040 (manufactured by Mitsubishi Chemical Corporation) can be exemplified.

[0053] <Protic polar solvent> The pretreatment agent according to the first embodiment of the present invention contains an organic solvent, and the organic solvent is a protic polar solvent.

[0054] Protic polar solvents can strongly solvate negatively charged dyes through hydrogen bonds, thereby fixing the dyes at desired locations and preventing bleeding. Furthermore, it is presumed that the pretreatment agent containing the protic polar solvent can delay drying of the pretreatment agent (drying of water) and delay viscosity increase of the pretreatment agent (prevent rapid viscosity increase) in the inkjet head when not ejecting.

[0055] Examples of the protic polar solvent include polyols, methanol, ethanol, isopropanol, acetic acid, etc. Among them, polyols, methanol, and ethanol are preferred, and polyols are more preferred.

[0056] Examples of the polyol include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, glycerol, and dipropylene glycol. Among them, ethylene glycol, propylene glycol, and glycerol are preferred.

[0057] These protic polar solvents may be used alone or in combination of two or more.

[0058] From the viewpoint of the barrier effect, the boiling point of the protic polar solvent is preferably 160° C. or higher, more preferably 170° C. or higher, further preferably 180° C. or higher, particularly preferably 190° C. or higher, and most preferably 195° C. or higher. On the other hand, from the viewpoint of volatility, the boiling point of the protic polar solvent is preferably 300° C. or lower, more preferably 295° C. or lower, and further preferably 290° C. or lower.

[0059] The boiling point of the protic polar solvent can be measured by, for example, the equilibrium reflux boiling point method (JISK 2233).

[0060] The boiling points of the polyols exemplified as suitable protic polar solvents are shown below. Ethylene glycol: boiling point 197.6°C Diethylene glycol: boiling point 245°C Triethylene glycol: boiling point 287.4°C Tetraethylene glycol: boiling point 328°C Propylene glycol: boiling point 188°C Dipropylene glycol: boiling point 232.2°C Glycerol: boiling point 290℃ Dipropylene glycol: boiling point 265~270℃

[0061] From the viewpoint of the barrier effect, the SP value (Hildebrand solubility parameter, δ) of the protic polar solvent is preferably 18.0 MPa. 1 / 2 More preferably 20.0 MPa 1 / 2 Above, more preferably 25.0 MPa 1 / 2 Above, particularly preferably 30.0 MPa 1 / 2 On the other hand, from the viewpoint of the anti-seepage effect, the SP value of the protic polar solvent is preferably 40.0 MPa 1 / 2 Below, more preferably 36.0MPa 1 / 2 Below, more preferably 35.0 MPa 1 / 2 Below, particularly preferably 32.0 MPa 1 / 2 the following.

[0062] About the HSP value of protic polar solvents (Hansen solubility parameter: δ D , δ P , δ H ), from the perspective of anti-seepage effect, δ D Preferably 16.0 MPa 1 / 2 More preferably 17.0 MPa 1 / 2 Above, more preferably 17.5MPa 1 / 2 Above, particularly preferably 18.0 MPa 1 / 2 On the other hand, from the perspective of anti-seepage effect, δ D Preferably 20.0 MPa 1 / 2 Below, more preferably 19.5MPa 1 / 2 Below, more preferably 19.0 MPa 1 / 2 Below, particularly preferably 18.5 MPa 1 / 2 the following. From the perspective of anti-seepage effect, δ P Preferably 5.5 MPa 1 / 2 More preferably 8.0 MPa 1 / 2 More preferably, 9.0 MPa 1 / 2 Above, particularly preferably 11.0 MPa 1 / 2 On the other hand, from the perspective of anti-seepage effect, δ P Preferably 13.0 MPa 1 / 2 Below, more preferably 12.5MPa 1 / 2 Below, more preferably 12.0 MPa 1 / 2 Below, particularly preferably 11.5 MPa 1 / 2 the following. From the perspective of anti-seepage effect, δ H Preferably 6.0 MPa 1 / 2 More preferably 15.0 MPa 1 / 2 Above, more preferably 21.0 MPa 1 / 2 Above, particularly preferably 23.0 MPa 1 / 2 On the other hand, from the perspective of anti-seepage effect, δ H Preferably 30.0 MPa 1 / 2 Below, more preferably 29.0 MPa 1 / 2 Below, more preferably 25.0 MPa 1 / 2 Below, particularly preferably 23.5 MPa 1 / 2 the following.

[0063] The SP value can be calculated using the HSP value because the HSP value and the SP value have a relationship as shown in the following formula (1). (δ) 2 =(δ D ) 2 +(δ P ) 2 +(δ H ) 2 (1) The HSP value can be calculated using the software: HSPiP (Hansen Solubility Parameters in Practice).

[0064] Among the polyols exemplified as suitable protic polar solvents, the SP value (MPa) of the main polyols is 1 / 2 ) and HSP value (MPa 1 / 2 It should be noted that the following (calculated value) refers to the value calculated as the value at 25°C by the above method, and the following (literature value) refers to the value with reference to "POLYMER HANDBOOK, FOURTH EDITION, Vol. 2, J. BRANDRUP, EHIMMERGUT and EAGRULKE, pp. 688-694, 698-701". Ethylene glycol: SP value = 31.5 (calculated value) HSP value (δ D , δ P , δ H )=18.0、11.1、23.4(calculated value) Diethylene glycol: SP value = 29.2 (calculated value) HSP value (δ D , δ P , δ H )=17.4、10.6、20.9(calculated value) Triethylene glycol: SP value = 21.9 (literature value) HSP value (δ D , δ P , δ H )=16, 12.5, 18.6 (literature value) Propylene glycol: SP value = 29.3 (calculated value) HSP value (δ D , δ P , δ H )=17.4、9.1、21.7(calculated value) Dipropylene glycol: SP value = 26.4 (calculated value) HSP value (δ D , δ P , δ H )=16.5、10.6、17.7(calculated value) Glycerol: SP value = 35.7 (calculated value) HSP value (δ D , δ P , δ H )=18.3、11.3、28.5(calculated value)

[0065] <Moisturizer> The pretreatment agent according to the second embodiment of the present invention contains a moisturizing agent having a boiling point of 180° C. or higher.

[0066] The moisturizing agent has the following functions: delaying the drying of the pretreatment agent (drying of water) in the inkjet head when not ejecting, and delaying the viscosity increase of the pretreatment agent (preventing a sharp viscosity increase). Among them, some common moisturizing agents are prone to oozing out, so in the present invention, a moisturizing agent with a boiling point of 180° C. or more and which is unlikely to ooze out is used.

[0067] The boiling point of the moisturizing agent may be 180° C. or higher, but from the viewpoint of the anti-seepage effect, it is preferably 185° C. or higher, more preferably 190° C. or higher, and even more preferably 195° C. or higher. On the other hand, if the boiling point of the moisturizing agent is too high, it is difficult to volatilize, so the boiling point of the moisturizing agent is preferably 300° C. or lower, more preferably 295° C. or lower, and even more preferably 290° C. or lower.

[0068] The boiling point of the moisturizing agent can be measured by, for example, the equilibrium reflux boiling point method (JISK 2233).

[0069] As mentioned above, the following effects are taken into consideration: since it can strongly solvate with the negatively charged dye through hydrogen bonds, the dye can be fixed at the desired position and can prevent bleeding; in the inkjet head when no ejection is performed, the drying of the pretreatment agent (drying of water) can be delayed and the viscosity increase of the pretreatment agent can be delayed (preventing a sharp viscosity increase). Therefore, the humectant used in the second embodiment of the present invention is preferably a humectant selected from the protic polar solvent.

[0070] In addition, as the moisturizer used in the present invention, from the viewpoint of penetration and seepage, polyols, ethers, nitrogen-containing heterocyclic compounds, amides, amines, sulfur-containing compounds, etc. can be cited. Among them, polyols, ethers, amides, and amines are preferred, and polyols are more preferred.

[0071] Examples of the polyol include ethylene glycol (boiling point 197.6° C.), diethylene glycol (boiling point 245° C.), triethylene glycol (boiling point 287.4° C.), tetraethylene glycol (boiling point 328° C.), propylene glycol (boiling point 188° C.), dipropylene glycol (boiling point 232.2° C.), glycerol (boiling point 290° C.), and dipropylene glycol (boiling point 265 to 270° C.). Among them, ethylene glycol, propylene glycol, and glycerol are preferred.

[0072] These moisturizing agents may be used alone or in combination of two or more. It should be noted that the preferred SP value and HSP value of the moisturizing agent are the same as the preferred SP value and HSP value of the protic polar solvent.

[0073] <Defoaming agent> The pretreatment agent of the present invention may contain a defoaming agent.

[0074] By adding a defoaming agent, bleeding can be more reliably prevented and the permeability of the ink can be improved.

[0075] As the defoamer, any defoamer used in conventional fiber treatment can be used, for example, alcohol defoamers, fatty acid derivative defoamers, and silicone defoamers can be cited. Among them, from the viewpoint of washing properties when washing away dyes and auxiliaries that are not fixed on the fabric, it is preferred to contain one or more silicone defoamers.

[0076] The defoaming agent may be used alone or in combination of two or more.

[0077] (Alcohol defoamer) As the alcohol-based defoaming agent, an alcohol-based defoaming agent having an HLB value of 15 or less is preferred, and an alcohol-based defoaming agent having an HLB value of 10 or less is more preferred.

[0078] As the alcohol defoamer, a higher alcohol can be preferably used. The carbon number of the higher alcohol is preferably 12 or more, and on the other hand, it is preferably 25 or less, and more preferably 22 or less. For example, the carbon number is preferably 12-25, and more preferably 12-22.

[0079] In addition, the alcohol-based defoaming agent may be any of primary alcohol, secondary alcohol and tertiary alcohol, among which primary alcohol and secondary alcohol are preferred.

[0080] In addition, as an alcohol-based defoaming agent, any of monohydric alcohol and polyhydric alcohol can be used. The number of hydroxyl groups in the alcohol is preferably 2 or more, and on the other hand, it is preferably 4 or less, and more preferably 3 or less. For example, the number of hydroxyl groups is preferably 2-4, and more preferably 2-3.

[0081] As the alcohol-based defoaming agent, an alcohol having an ether group can also be preferably used.

[0082] Examples of the alcohol having an ether group include polyalkylene glycol compounds and alcohols obtained by addition polymerization of alkylene oxides (oxyalkylenes) to higher alcohols. As the alkylene oxide, ethylene oxide or propylene oxide can be used. Among them, polyalkylene glycol compounds are preferred, and polyethylene glycol compounds are more preferred. In addition, the polyethylene glycol compound further preferably has an alkyl group. That is, an alkyl-polyethylene glycol compound is further preferred.

[0083] Examples of the alcohol-based defoaming agent include dipentylphenoxyethanol, 3-heptanol, 2-ethylhexanol, acetylene alcohol, acetylene glycol, isopropanol, and alkyl-polyethylene glycol compounds in addition to the above.

[0084] Among the above, higher alcohols and alcohols having an ether group are preferred, higher alcohols and polyalkylene glycol compounds are more preferred, higher alcohols and polyethylene glycol compounds are further preferred, and higher alcohols and alkyl-polyethylene glycol compounds are particularly preferred.

[0085] Examples of commercially available alcohol-based defoamers include Anti-Froth F-102 and F-103 (both manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) and Defoamer (manufactured by Furukawa Chemical Industries, Ltd.).

[0086] (Fatty acid derivative defoamer) As the fatty acid derivative-based antifoaming agent, one having an HLB value of 15 or less is preferred, and one having an HLB value of 10 or less is more preferred.

[0087] As the fatty acid derivative-based defoaming agent, for example, mineral oil, sorbitan fatty acid ester, fatty acid ester, glycerol fatty acid ester, sucrose fatty acid ester can be cited. Among them, mineral oil with excellent quick-acting property is preferred. In addition, as the mineral oil, long-chain alkyl-based mineral oil is preferred.

[0088] The carbon number of the fatty acid used in the raw material of the fatty acid derivative of the fatty acid derivative defoamer is preferably 16 or more, more preferably 18 or more. On the other hand, it is preferably 24 or less, more preferably 22 or less. The above upper and lower limits can be combined arbitrarily. For example, the carbon number of the fatty acid is preferably 16 or more and 24 or less, more preferably 18 or more and 22 or less.

[0089] Examples of fatty acids used as a raw material of the fatty acid derivative of the fatty acid derivative-based defoaming agent include stearic acid, oleic acid, erucic acid, and behenic acid. Among them, stearic acid is preferred.

[0090] Examples of commercially available fatty acid derivative-based antifoaming agents include S-39H and S-49H (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) and NK-2 (manufactured by Osaka Chemical Co., Ltd.).

[0091] (Silicone-based defoaming agent) There is no particular limitation on the silicone defoamer. For example, any of an aqueous system and a non-aqueous system can be used. The silicone defoamer may be an oil type composed of silicone oil, an oil composite type in which a dispersant is added to silicone oil, an emulsion type in which silicone oil is made into an emulsion, or a self-emulsifying type. Among them, the emulsion type is preferred from the viewpoint of supplementing the dispersibility in water. Among the emulsion types, the O / W type is more preferred.

[0092] Specific examples of the silicone-based defoaming agent include polydimethylsiloxane, dimethylsilicone, and fluorosilicone. Among them, polydimethylsiloxane is preferred.

[0093] Commercially available products of the silicone-based defoaming agent include, for example, TSA 730, TSA 732, TSA 770, TSA 772, TSA 7341, YMA 6509, and TSA 780 (all manufactured by GE Toshiba Silicones), M-6500 and M-700 (all manufactured by YAMAHA Co., Ltd.), ANTIFOAM SS and ANTIFOAM S-8 (all manufactured by Nissei Chemicals Co., Ltd.), KM-70, KM-71, KM-73, KM-73A, KM-90, KM-89, KM-83A, KM-75, KS-502, KS-537, KM-98, KM-7750, and X-50-1041 (all manufactured by Shin-Etsu Chemical Co., Ltd.).

[0094] <Paste> The pretreatment agent of the present invention may contain a paste.

[0095] As the paste, any of a natural paste, a semi-synthetic paste, and a synthetic paste can be used. Examples of the natural paste include starch pastes such as corn starch and British gum; gum pastes such as guar gum and locust bean gum; seaweed pastes such as alginate and agar; and inorganic pastes such as montmorillonite and silica (silicon dioxide). Examples of the semisynthetic paste include cellulose-based pastes such as carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose. Examples of the synthetic paste include polyvinyl alcohol, polyacrylate, polyethylene oxide, and polyvinyl acetate / maleic anhydride salt.

[0096] The paste preferably contains a nonionic or anionic paste that is compatible with the N-vinylformamide-based cationic polymer. By adding the paste, the pretreatment agent can be adjusted to an appropriate viscosity. "The paste is compatible with the N-vinylformamide-based cationic polymer" means that 250 g of a 1 mass % aqueous solution of an N-vinylformamide-based cationic polymer and a 1 mass % aqueous solution of a paste are mixed, and after being left at 25°C for 24 hours, the sieve residue when filtered through an 80-mesh sieve is less than 10 g.

[0097] Examples of the nonionic or anionic paste that is compatible with the N-vinylformamide-based cationic polymer include hydroxyethyl cellulose, methyl cellulose, hydroxypropyl methyl cellulose, guar gum, and montmorillonite.

[0098] The paste may be used alone or in combination of two or more.

[0099] As the paste, a natural paste and / or a semi-synthetic paste is preferably used, and more preferably contains one or more selected from methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and guar gum. In addition, from the viewpoint of excellent cleaning properties when washing off dyes or auxiliaries not fixed to the fabric, it is more preferred to use one or more selected from methyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and guar gum in combination with montmorillonite as the paste.

[0100] Examples of commercially available pastes include hydroxypropylmethylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd.), guar gum (ESAFLOR 4W, manufactured by Lamberti), and montmorillonite (KUNIPIA F and SUMECTON, both manufactured by Kunimine Industries, Ltd.).

[0101] <Concentrated dye> The pre-treatment agent of the present invention may contain a thick dye. By mixing a thick dye, the permeability of ink to the fabric can be further improved.

[0102] As the concentrated dye, among the concentrated dyes used in general fiber treatment, a concentrated dye having compatibility with the N-vinylformamide-based cationic polymer is preferred. "The concentrated dye is compatible with the N-vinylformamide-based cationic polymer" means that when 250 g of each of a 1 mass % aqueous solution of the N-vinylformamide-based cationic polymer and a 1 mass % aqueous solution of the concentrated dye are mixed and allowed to stand at 25°C for 24 hours, the residue on filtering with an 80-mesh sieve is less than 10 g.

[0103] The thick dyeing agent having compatibility with the N-vinylformamide-based cationic polymer is not particularly limited, and examples thereof include amides, glycol ethers, and polyethers. Among them, amides are preferred, and N-alkanolamides are more preferred.

[0104] The strong dyeing agent may be used alone or in combination of two or more.

[0105] Examples of commercially available dark dyes include Sunfloren SN (N-alkanolamide, manufactured by Nikka Chemical Co., Ltd.), Hiol 420 (glycol ether of a higher alcohol, manufactured by Hayashi Chemical Co., Ltd.), and Cellopol PA-19S (manufactured by Sanyo Chemical Co., Ltd.).

[0106] <Optional Ingredients> The pretreatment agent of the present invention may contain, as an optional component, water, an organic solvent other than the protic polar solvent or humectant, a solubilizing agent, a viscosity modifier, a pH modifier, a reduction inhibitor, a preservative, or a surfactant, within a range that does not impair the effects of the present invention.

[0107] <Composition> Hereinafter, the composition of the pretreatment agent of the present invention will be described.

[0108] In the following description of the composition, "content rate" refers to "the ratio of the content of the active ingredient contained in the preparation in the pretreatment agent", and "blending rate" refers to "the ratio of the amount of the preparation itself, that is, the preparation containing not only the active ingredient but also a solvent such as water, but also the solvent in the pretreatment agent (added amount)". Since the moisturizing agent itself is a solvent, the ratio of the content in the preparation is expressed as "content ratio".

[0109] The content of the N-vinylformamide-based cationic polymer in the pretreatment agent of the present invention varies depending on the type of fabric to be treated, the amount of the pretreatment agent applied, and the like. As the solid content relative to 100% by mass of the total mass of the pre-treatment agent, the content of the N-vinyl formamide-based cationic polymer is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and further preferably 0.5% by mass or more. When the content of the N-vinyl formamide-based cationic polymer is above the lower limit, it is easy to improve the adhesion of the ink to the fabric. As the solid content relative to the total mass 100 mass % of the pre-treating agent, the upper limit of the content of the N-vinyl formamide-based cationic polymer is preferably 5.0 mass % or less, more preferably 3.0 mass % or less, further preferably 2.0 mass % or less, particularly preferably 1.0 mass % or less, and most preferably 0.9 mass % or less. When the content of the N-vinyl formamide-based cationic polymer is below the upper limit, the washing property when washing away the dye and auxiliary agent not fixed on the fabric is improved, and the texture is also improved.

[0110] The above upper and lower limits may be combined arbitrarily. For example, the content of the N-vinylformamide-based cationic polymer in the pretreatment agent is preferably 0.1% by mass or more and 5.0% by mass or less, more preferably 0.2% by mass or more and 3.0% by mass or less, and further preferably 0.5% by mass or more and 2.0% by mass or less. In particular, when the content of the N-vinylformamide-based cationic polymer in the pretreatment agent is 0.1% by mass or more and 0.9% by mass or less, it is preferred because the adhesion of the ink to the fabric, the washability, and the texture can be improved in a well-balanced manner.

[0111] Relative to the gross mass 100 mass % of pre-treating agent, the content of the protic polar solvent in the pre-treating agent of the present invention is preferably more than 5 mass %, more preferably more than 10 mass %, more preferably more than 20 mass %. When the content of the protic polar solvent is above the lower limit, the effect of preventing drying obtained by containing the protic polar solvent is excellent, and the stability of inkjet printing is excellent. On the other hand, from the viewpoint of anti-seepage, relative to the gross mass 100 mass % of pre-treating agent, the upper limit of the content of the protic polar solvent is preferably less than 50 mass %, more preferably less than 45 mass %, more preferably less than 40 mass %. For example, the content of the protic polar solvent is preferably 5% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 45% by mass or less, and further preferably 20% by mass or more and 45% by mass or less.

[0112] Relative to the total mass 100 mass % of the pre-treating agent, the content of the humectant in the pre-treating agent of the present invention is preferably 5 mass % or more, more preferably 10 mass % or more, and further preferably 20 mass % or more. When the content of the humectant is above the lower limit, the stability of inkjet printing is excellent by containing the humectant for preventing the drying effect. On the other hand, from the viewpoint of anti-seepage, relative to the total mass 100 mass % of the pre-treating agent, the upper limit of the content of the humectant is preferably 50 mass % or less, more preferably 45 mass % or less, and further preferably 40 mass % or less. The upper and lower limits may be combined arbitrarily. For example, the content of the moisturizer is preferably 5% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 45% by mass or less, and further preferably 20% by mass or more and 45% by mass or less.

[0113] When the pretreatment agent of the present invention contains a defoamer, from the viewpoint of texture and washing properties, the compounding rate of the defoamer in the pretreatment agent is preferably 0.1% by mass or more, more preferably 1.0% by mass or more, and further preferably 2.0% by mass or more, relative to the total mass 100% by mass of the pretreatment agent. On the other hand, from the viewpoint of anti-seepage, the compounding rate of the defoamer is preferably 5.0% by mass or less, more preferably 4.0% by mass or less, and further preferably 3.0% by mass or less, relative to the total mass 100% by mass of the pretreatment agent. For example, the blending ratio of the defoaming agent is preferably 0.1 mass % to 5.0 mass %, more preferably 1.0 mass % to 4.0 mass %, and further preferably 2.0 mass % to 3.0 mass %.

[0114] When the pre-treating agent of the present invention contains a paste, the content of the paste in the pre-treating agent is different according to the viscosity required for the coating method. From the viewpoint of easily improving the viscosity of the pre-treating agent, as the solid content relative to the total mass 100% by mass of the pre-treating agent, the content of the paste in the pre-treating agent is preferably more than 0.5% by mass, more preferably more than 1.0% by mass. On the other hand, from the viewpoint of excellent detergency when washing off dyes and auxiliaries that are not fixed on the fabric, as the solid content relative to the total mass 100% by mass of the pre-treating agent, the content of the paste is preferably less than 5.0% by mass, more preferably less than 4.0% by mass. The above upper and lower limits may be arbitrarily combined. For example, the content of the paste in the pretreatment agent is preferably 0.5% by mass or more and 5.0% by mass or less, and more preferably 1.0% by mass or more and 4.0% by mass or less.

[0115] When the pretreatment agent of the present invention contains a strong dye, from the viewpoint of excellent permeability of ink in the fabric, the compounding ratio of the strong dye in the pretreatment agent is preferably 1.0% by mass or more, more preferably 3.0% by mass or more, and further preferably 4.0% by mass or more, relative to the total mass of the pretreatment agent (100% by mass). On the other hand, from the viewpoint that the ink is difficult to ooze out, the compounding ratio of the strong dye relative to the total mass of the pretreatment agent (100% by mass) is preferably 20.0% by mass or less, more preferably 15.0% by mass or less, further preferably 10.0% by mass or less, and particularly preferably 8.0% by mass or less. For example, the blending ratio of the thick dye in the pretreatment agent is preferably 1.0 mass % to 20.0 mass %, more preferably 3.0 mass % to 15.0 mass %, and further preferably 4.0 mass % to 8.0 mass %.

[0116] When the pre-treatment agent of the present invention contains a strong dye, the amount of the strong dye in the pre-treatment agent is preferably 400 parts by mass or more, more preferably 450 parts by mass or more, based on 100 parts by mass of the total mass of the N-vinylformamide polymer, from the viewpoint of excellent ink permeability in the fabric. On the other hand, from the viewpoint of difficulty in ink seepage, the upper limit of the amount of the strong dye is preferably 2000 parts by mass or less, more preferably 1500 parts by mass or less, based on the total mass of the N-vinylformamide polymer. The above upper and lower limits may be combined arbitrarily. For example, the amount of the thick dyeing agent in the pretreatment agent is preferably 400 parts by mass or more and 2000 parts by mass or less, and more preferably 450 parts by mass or more and 1500 parts by mass or less.

[0117] [Method for producing pretreatment agent] The method for producing the pretreatment agent for inkjet printing of the present invention is not particularly limited, and examples thereof include a method of mixing an N-vinylformamide-based cationic polymer, a protic polar solvent or a moisturizing agent, and other additives used as needed, and stirring. During stirring, a known stirrer can be used.

[0118] [Inkjet printing method] The inkjet printing method of the first embodiment of the present invention comprises: The process of pre-treating the fabric with the pre-treating agent for inkjet printing and dyeing of the present invention, and In the case where the pre-treated fabric is not dried, the step of inkjet printing is performed on the pre-treated region of the fabric. The second inkjet printing and dyeing method of the present invention comprises: Pre-treatment step: inkjet-spraying a pre-treatment agent containing an N-vinyl formamide-based cationic polymer onto the fabric for pre-treatment, and Printing step: inkjet printing is performed on the pre-treated area of ​​the pre-treated fabric.

[0119] <Pretreatment agent coating step> The material of the fabric to be pretreated is not particularly limited as long as it is a fabric commonly used in inkjet printing, and an example thereof is polyester.

[0120] The pretreatment of the fabric can be carried out, for example, by applying the pretreatment agent of the present invention to the fabric. As a method for applying the pretreatment agent of the present invention, for example, a method of ejecting the pretreatment agent by inkjet, a method of immersing the fabric in the pretreatment agent, a method of applying the pretreatment agent by a roll coater, a method of applying the pretreatment agent by a scraper, and a method of spraying the pretreatment agent by a spray device can be cited. The method of the pretreatment agent for inkjet ejection is preferred because of less drainage and space saving.

[0121] (Inkjet printing process) In the inkjet printing and dyeing method of the present invention, it is preferred to inkjet print a fabric pretreated with the pretreatment agent of the present invention without drying. Herein, "inkjet printing a pretreated fabric without drying" means inkjet printing on the area coated with the pretreatment agent during the period when the pretreatment agent on the fabric is in a liquid state.

[0122] As the ink used in inkjet printing, disperse dyes can be exemplified. The pretreatment agent of the present invention is particularly suitable for inkjet printing and dyeing of polyester fabrics with disperse dyes.

[0123] In the inkjet printing and dyeing method of the present invention, in addition to using the pretreatment agent for inkjet printing and dyeing of the present invention and inkjet printing a pretreated fabric without drying, known methods can be adopted.

[0124] For example, after inkjet printing, the ink is infiltrated into the fabric interior by dry heat treatment (oven) or steam heat treatment (steaming), and the dyes and auxiliaries not fixed on the fabric are washed off by washing treatment. As the washing treatment, known washing methods can be adopted, but reduction washing is preferred, and alkali reduction treatment is more preferred.

[0125] As described above, in the present invention, the pretreatment agent of the present invention containing an N-vinylformamide-based cationic polymer, a protic polar solvent or a humectant with a boiling point of 180 °C or higher is used. By using the pretreatment agent of the present invention, even when inkjet printing is performed without drying after coating the pretreatment agent, bleeding can be prevented, and in addition, defects such as head clogging caused by drying of the pretreatment agent can be prevented, and inkjet printing can be carried out smoothly and stably. And by not drying after coating the pretreatment agent, thereby, the productivity is improved, and cost reduction, energy saving and space saving can be achieved. Examples

[0126] Hereinafter, the present invention will be specifically described by examples. The present invention is not limited by the following description.

[0127] [Materials] The materials used in the examples and comparative examples are as follows. <N-vinylformamide-based cationic polymer> PVADL1: Polyamidine (trade name "PVADL", manufactured by Mitsubishi Chemical Corporation, polymer concentration 26.6% aqueous solution, molecular weight: 300,000, cationicity: 5.1 meq / g) PVADL2: polyamidine (polymer concentration 26.6% aqueous solution, molecular weight: 147,000, cationicity: 5.5 meq / g)

[0128] <Other cationic polymers> Polyallylamine hydrochloride (trade name "PAA-HCl-10L", manufactured by Nittobo Medical, molecular weight: 150,000 (catalog value))

[0129] It should be noted that the molecular weights of the PVADL1 and the PVADL2 are values ​​measured by the following method. Device: HLC-8320 (manufactured by Tosoh Corporation) Chromatographic column: TSKge1 guardcolumn PW XL -CP(6.0mmI.D.×4cm)+TSKgelG6000PW XL -CP+TSKgelg3000PW XL -CP (each 7.8mmI.D×30cm) (manufactured by Tosoh Corporation) Detector: RI detector Eluent: 0.2M-NaNO3 aqueous solution Flow rate: 1.0ml Calibration curve: Standard pullulan (Shodex) Concentration: Equivalent to 0.1wt% Injection volume: 100 μL Column temperature: 40°C Pretreatment: Add caustic soda to the polymer aqueous solution to adjust the pH to 5-7, and use it as a sample. Weigh the sample, add a specified amount of eluent, and dilute to 0.1wt%. After 2 hours, slowly shake and mix the sample solution, and filter it with a 0.45μm hydrophilic PTFE cartridge filter.

[0130] <Defoaming agent> Silicone (trade name "KM-90", manufactured by Shin-Etsu Chemical Co., Ltd., emulsion type, containing ingredients: polydimethylsiloxane)

[0131] <Protonic polar solvent / humectant> Ethylene glycol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., boiling point: 197.6°C, SP value: 31.5 (calculated value), HSP value (δ D ,δ P ,δ H ): 18.0, 11.1, 23.4 (calculated value) Propylene glycol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., boiling point: 188°C, SP value: 29.3 (calculated value), HSP value (δ D , δ P , δ H ): 17.4, 9.1, 21.7 (calculated) Glycerol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., boiling point: 290°C, SP value: 35.7 (calculated value), HSP value (δ D , δ P , δ H ): 18.3, 11.3, 28.5 (calculated value) Diethylene glycol ethyl methyl ether (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., boiling point: 176°C, SP value: 17.6 (calculated value), HSP value (δ D , δ P , δ H ): 15.8, 5.4, 5.7 (calculated)

[0132] [Examples 1 to 5 and Comparative Examples 1 to 4] <Preparation of pretreatment agent> A pretreatment agent was prepared according to the composition shown in Table 1. Specifically, each component was put into a container, stirred for 2 hours using a stirrer, and then left to mature overnight. The numerical units of the content or blending ratio of each component in Table 1 are mass %. The N-vinylformamide-based cationic polymer and the paste are expressed as the content of the effective ingredient (solid content) relative to 100 mass % of the total mass of the pre-treatment agent. The content of the humectant is the content relative to 100 mass % of the total mass of the pre-treatment agent. The blending ratio of the defoamer is the blending ratio relative to 100 mass % of the total mass of the pre-treatment agent. The added water is adjusted so that the total amount of the pre-treatment agent becomes 100 mass %. In Table 1, columns without numerical values ​​indicate that the components are not contained. In addition, the viscosity of the pretreatment agent of Example 1 is 9.80 mPa·s, and the surface tension is 25.73 mN / m, and the viscosity of the pretreatment agents of Examples 2 to 4 and Comparative Example 1 is 6.90 mPa·s. The viscosity of the pretreatment agent of Comparative Example 3 is 5.96 mPa·s, and the surface tension is 30.63 mN / m. The viscosity of the pretreatment agent of Comparative Example 4 is 6.65 mPa·s, and the surface tension is 29.08 mN / m. The viscosity of the pretreatment agent of Example 5 is 3.28 mPa·s, and the surface tension is 26.87 mN / m.

[0133] <Pre-processing> The inkjet discharge test of the pretreatment agent was performed using an inkjet device (Inkjet Lab, manufactured by Cluster Technology Co., Ltd.) as described below. In the printing test for bleeding evaluation described later, the pretreatment agent was applied using a commercially available hand-held cosmetic sprayer. The amount of the pretreatment agent applied was determined based on the viscosity of the pretreatment agent composition, the weight per unit area of ​​the fabric, and the printing area, but was sprayed in 3 steps.

[0134] <Inkjet Printing> The fabrics of Examples 1 to 5 and Comparative Examples 1 to 4 were transferred to an inkjet device (Inkjet Laboratory, manufactured by Cluster Technology Co., Ltd.) within 5 seconds after the application of the pretreatment agent, i.e., before the applied pretreatment agent dried, and ink was applied to the area applied with the pretreatment agent. As the ink, black dispersed ink manufactured by Toshin Kogyo Co., Ltd. was used. As the fabric, polyester crepe (Decin) (vertical density 221 strands / inch, horizontal density 108 strands / inch, unit area weight 91 g / m 2 ) (Made by Color Dyeing Co., Ltd.) A grid pattern was used as the printed image pattern. In the above pattern, the size of the grid was 2 mm square and the thickness of the line was 0.2 mm.

[0135] <Steam Heat Treatment> The fabric coated with the ink was subjected to a steam heat treatment at 170° C. for 10 minutes using a HT-3-550 HT steamer manufactured by Tsujii Someki Kogyo Co., Ltd.

[0136] <Washing treatment> The steam-heat treated fabric was scrubbed twice for 1 second and washed with water for 10 minutes. 2 g / L of surfactant (AMILADIN D), 2 g / L of sodium dithionite, and 2 g / L of NaOH (granules) were added to 80°C warm water, dissolved, and then added to the washed fabric for 10 minutes of reduction washing to wash away the pre-treatment agent and residual ink attached to the fabric. After the reduction washing, wash again with water to wash off the reduction washing agent attached to the fabric.

[0137] [Reference Example 1] A pretreatment agent of the following composition containing no cationic polymer was prepared, and inkjet printing was performed in the same manner as in Examples 1 to 5 and Comparative Examples 1 to 4 except that the pretreatment agent was applied and dried in a dryer for 10 minutes before inkjet printing.

[0138] <Pretreatment Agent Composition of Reference Example 1> <Paste> Sodium alginate powder (produced by Tanaka Naoki Seisakusho): 4.2 mass% <Intense dye> N-alkanolamide (trade name "Sunfloren SN", manufactured by Nikka Chemical Co., Ltd.): 4.5% by mass <Defoaming agent> Alcohol (trade name "Defoaming agent", manufactured by Furukawa Chemical Industry Co., Ltd., containing ingredients: higher alcohols): 2.5% by mass <Preservative> Trade name "Neoguard" (manufactured by Furukawa Chemical Industries, Ltd.): 0.5 mass% Glycerol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.): 0.5 mass% Water: The rest

[0139] [Evaluation test] The following evaluations were performed on the evaluation fabrics that were subjected to inkjet printing after the pretreatment in each example. The results are shown in Table 1.

[0140] <Intermittent operation stability (inkjet discharge test of pretreatment agent)> The inkjet device (manufactured by Cluster Technology Co., Ltd., inkjet laboratory) was filled with liquid pretreatment agent, and the voltage was adjusted so that the ejection speed was within the range of 4m / s±5%. The device was ejected continuously for 10 minutes and then stopped. After 60 seconds of stopping, the device was operated again. If the ejection speed was 4m / s±5%, there was no satellite, and there was no tilt and scattering, the intermittent operation stability was recorded as "". Other cases were recorded as "×".

[0141] <Bleeding (Printing Test)> The degree of ink bleeding was evaluated as follows. When the printed image pattern was visually observed from a position 30 cm away from the fabric, the case where the appearance of the intersection of the grid looked as clear as that of Reference Example 1 was recorded as "", the case where it was worse than Reference Example 1 was recorded as "×", and the case where the intersection could not be confirmed and had practical problems was recorded as "×".

[0142] [Table 1]

[0143] [Consideration on the first embodiment of the pretreatment agent of the present invention] As shown in Table 1, in Examples 1 to 5 using a protic polar solvent as an organic solvent, coating can be stably performed by inkjet, and even if inkjet printing is performed in an undried state after pretreatment, the same degree of bleeding difficulty as that of Reference Example 1 in which inkjet printing is performed after drying after pretreatment can be obtained. On the other hand, in Comparative Example 1 using an aprotic polar solvent, bleeding occurred when inkjet printing was performed without drying, and in Comparative Example 2 containing no organic solvent itself, stable inkjet coating could not be performed. In addition, in Comparative Examples 3 and 4 using cationic polymers other than N-vinylformamide, bleeding occurred when inkjet printing was performed without drying.

[0144] [Consideration on the Second Embodiment of the Pretreatment Agent of the Present Invention] As shown in Table 1, in Examples 1 to 5 using a moisturizing agent having a boiling point of 180° C. or higher, coating can be stably performed by inkjet, and even when inkjet printing is performed in an undried state after pretreatment, the same degree of bleeding difficulty as in Reference Example 1 in which inkjet printing is performed after drying after pretreatment can be obtained. On the other hand, in Comparative Example 1 in which the boiling point of the humectant was lower than 180° C., bleeding occurred when inkjet printing was performed without drying, and in Comparative Example 2 containing no humectant, stable inkjet coating could not be performed. In addition, in Comparative Examples 3 and 4 in which cationic polymers other than N-vinylformamide were used, bleeding occurred when inkjet printing was performed without drying.

[0145] Although the present invention has been described in detail using specific embodiments, it is obvious to those skilled in the art that various modifications can be made within the scope of exerting the effects of the present invention. This application is based on Japanese patent application No. 2022-155127 filed on September 28, 2022, the entire contents of which are incorporated herein by reference. Industrial Applicability

[0146] According to the present invention, in the inkjet printing of fabrics using dye ink, the ink is applied without drying after applying the pretreatment agent, and no bleeding occurs, so that the inkjet printing can be performed smoothly and stably. Therefore, according to the present invention, it is possible to achieve improved productivity, cost reduction, energy saving, and space saving.

Claims

1. A pretreatment agent for inkjet printing and dyeing, comprising an N-vinyl formamide-based cationic polymer and an organic solvent, The organic solvent is a protic polar solvent.

2. The pretreatment agent for inkjet printing and dyeing according to claim 1, wherein The boiling point of the protic polar solvent is 180° C. or higher.

3. The pretreatment agent for inkjet printing and dyeing according to claim 1 or 2, wherein The boiling point of the protic polar solvent is 300° C. or lower.

4. The pretreatment agent for inkjet printing according to claim 1 or 2, wherein The content of the protic polar solvent in 100% by mass of the total mass of the pretreatment agent for inkjet textile printing is 5% by mass or more and 50% by mass or less.

5. A pre-treatment agent for inkjet printing and dyeing, wherein: Contains N-vinyl formamide cationic polymer and moisturizer. The humectant has a boiling point of 180° C. or higher.

6. The pretreatment agent for inkjet printing and dyeing according to claim 5, wherein The boiling point of the moisturizing agent is 300° C. or lower.

7. The pretreatment agent for inkjet printing and dyeing according to claim 5, wherein The humectant is a protic polar solvent.

8. The pretreatment agent for inkjet printing according to claim 5 or 6, wherein The content of the moisturizing agent in 100% by mass of the total mass of the pretreatment agent for inkjet textile printing is 5% by mass or more and 50% by mass or less.

9. The pretreatment agent for inkjet printing and dyeing according to claim 1 or 7, wherein The SP value of the protic polar solvent is 18.0 MPa 1 / 2 above.

10. The pretreatment agent for inkjet printing according to claim 1 or 7, wherein The protic polar solvent is a polyol.

11. The pretreatment agent for inkjet printing according to claim 1 or 5, wherein It further contains a defoaming agent.

12. The pretreatment agent for inkjet printing and dyeing according to claim 11, wherein The defoaming agent is a silicone-based defoaming agent.

13. The pretreatment agent for inkjet printing according to claim 1 or 5, wherein The cationicity of the N-vinylformamide-based cationic polymer is 2.0 meq / g or more and 8.0 meq / g or less.

14. The pretreatment agent for inkjet printing according to claim 1 or 5, wherein The N-vinylformamide-based cationic polymer contains at least one selected from polyamidine and polyvinylamine.

15. The pretreatment agent for inkjet printing according to claim 1 or 5, wherein The content of the N-vinylformamide-based cationic polymer is 0.1% by mass or more and 5.0% by mass or less as a solid content relative to 100% by mass of the total mass of the pretreatment agent.

16. An inkjet printing method, comprising: The fabric is pretreated with the pretreatment agent for inkjet printing according to claim 1 or 5, and inkjet printing is performed on the pretreated area of ​​the pretreated fabric without drying the pretreated fabric.

17. The inkjet printing method according to claim 16, wherein: The pre-treatment agent for inkjet printing is jetted onto the fabric.

18. The inkjet printing method according to claim 16, wherein: The ink used in the inkjet printing is disperse dye.

19. A pre-treatment agent for inkjet printing and dyeing, which is a pre-treatment agent for inkjet printing and dyeing ejected by an inkjet, It contains an N-vinylformamide-based cationic polymer.

20. A pretreatment agent for inkjet printing, comprising an N-vinylformamide-based cationic polymer and having a viscosity of 1.0 mPa·s or more and 30 mPa·s or less.

21. A pretreatment agent for inkjet printing, comprising an N-vinylformamide-based cationic polymer and having a surface tension of 10 mN / m or more and 80 mN / m or less.

22. The pretreatment agent for inkjet textile printing according to any one of claims 19 to 21, wherein The inkjet printing pretreatment agent further contains an organic solvent, and the organic solvent is a protic polar solvent.

23. An inkjet printing method, comprising: Pre-treatment process: on the fabric, inkjet sprays a pre-treatment agent containing N-vinyl formamide-based cationic polymer for pre-treatment; as well as Printing step: performing inkjet printing on the pre-treated area of ​​the pre-treated fabric.

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