JP5420186B2 - Inkjet printing method and printed matter - Google Patents

Description

  The present invention relates to an inkjet printing method for a mixed fabric composed of polyester fibers and polyurethane fibers, and a printed material printed by the method.

  Usually, when it is going to dye the mixed fabric comprised from a polyester fiber and a polyurethane fiber, a disperse dye is selected as a dye. As a problem in that case, we would like to adsorb disperse dyes mainly to polyester fibers, but polyurethane fibers tend to adsorb disperse dyes more than polyester fibers. In addition, the disperse dye is excessively adsorbed to the polyurethane fiber. Troublesomely, polyurethane fibers are easy to adsorb disperse dyes, but are also easy to fall off. Therefore, mixed fabrics composed of polyester fibers and polyurethane fibers dyed with disperse dyes generally have various dyeing fastnesses. As a prominent example, liquid contamination during dry cleaning is often a problem.

  In Patent Document 1, a fiber product composed of a polyurethane elastic yarn and a polyester fiber is dyed with a disperse dye, and then reduced and washed in one bath using a combination of thiourea dioxide and sodium hydrosulfite as a reducing agent. Also disclosed is a method for treating a polyurethane elastic yarn-containing fiber product capable of obtaining a dyed disperse dye having high color developability and excellent dyeing fastness, particularly excellent dry cleaning fastness. However, this method is intended to remove the excess dye by strengthening the condition of the reduction cleaning, and as a result, there is a possibility that not only the excess dye but also the dye that has been dyed may be removed, and the dark color is reduced. This is an unsuitable method when trying to obtain it. Furthermore, there is a drawback in that color variation between batches is likely to occur and it is difficult to maintain color reproducibility.

  In addition, the problem that the various dyeing fastnesses are deteriorated is that, in the case of printing (printing), the disperse dye drops from the pattern portion to the white background (crying), so that the quality is remarkably lowered. This is a more serious problem than when dyeing (solid dyeing, solid dyeing), and particularly in the case of using an inkjet method in which low-viscosity ink is applied from one side of a fabric among printing (printing). Yes.

  In more detail about the problem that the various dyeing fastnesses are deteriorated, this problem is particularly noticeable when a red dye is used, and some improvement is required.

  As described above, when the mixed fabric composed of the polyester fiber and the polyurethane fiber is dyed, excessive adsorption of the disperse dye onto the polyurethane fiber has been the biggest problem. However, if the state in which the polyurethane fiber is not dyed at all is good, in this case, for example, when the dyed mixed fabric is stretched, the undyed polyurethane fiber is exposed, and the fabric looks whitish (uncovered) This is not preferable because a phenomenon occurs. Ideally, the disperse dye is adsorbed to the polyurethane fiber appropriately but not excessively. However, it is difficult in practice, and an effective improvement measure has not been proposed yet.

JP-A-10-280285

  In view of the above circumstances, the present invention has a good fastness to various dyeing and a blinding phenomenon when a mixed fabric composed of polyester fibers and polyurethane fibers is inkjet printed using a red disperse dye. It is an object of the present invention to provide an ink jet printing method in which no generation is observed, and a printed matter printed by the method.

  With respect to the above problems, the object of the present invention can be achieved by the following configuration. That is, this invention is the following inkjet printing method and the printed matter printed by this method.

1) A method for ink-jet printing a mixed fabric composed of polyester fibers (excluding cationic dyeable polyester fibers) and polyurethane fibers, and 150 ° C. or more as a red ink colorant for the mixed fabric An ink-jet printing method comprising performing ink-jet printing using a disperse dye having a melting point of

  2) Red ink is C.I. I. The inkjet printing method according to 1) above, which comprises one or more disperse dyes selected from the group consisting of Disperse Red 60, 86, 152, 177, 179, 343 and 202.

  3) Printed matter printed by the ink-jet printing method described in 1) or 2) above.

  By the inkjet printing method of the present invention, when a mixed fabric composed of polyester fibers and polyurethane fibers is inkjet printed using a red disperse dye, various dyeing fastnesses are good, and the occurrence of a blinding phenomenon occurs. Can be obtained.

  The color material contained in the red ink used in the ink jet textile printing method of the present invention is a disperse dye having a melting point of 150 ° C. or higher. When the melting point of the disperse dye contained in the red ink is 150 ° C. or higher, various dyeing fastnesses are good and it is possible to prevent the occurrence of peeling. For this reason, the excessive adsorption of the disperse dye to the polyurethane fiber in the ink jet printing is mainly caused by the heat treatment for fixing the dye after the ink jet printing, and this is caused by the dissolution of the disperse dye inside the fabric. This is thought to be due to the excessive penetration of water. That is, most of the disperse dye remains on the mixed fabric surface (polyester fiber side) immediately after inkjet printing, but is lower than the heat treatment temperature during heat treatment (150 ° C. or higher) for fixing the dye. The disperse dye having a melting point starts to dissolve, and it is considered that much of the disperse dye contained in the red ink penetrates into the fabric (polyurethane fiber side) before it adsorbs to the polyester fiber. It is considered that this phenomenon can be moderately suppressed by setting the melting point to 150 ° C. or higher.

  The melting point of the disperse dye can be easily measured by thermal analysis using a differential scanning calorimeter (DSC).

  As the disperse dye contained in the red ink in the inkjet printing method of the present invention, C.I. I. It is preferable to contain one or more disperse dyes selected from the group consisting of Disperse Red 60, 86, 152, 177, 179, 343 and 202.

In addition to the red ink described above, the ink installed in the inkjet printer
Examples thereof include yellow and blue three primary color inks, neutral color inks such as gray, beige, and brown, and black ink. The disperse dyes contained in these inks usually have a higher melting point than the disperse dyes contained in the red ink, and it is not necessary to select them so strictly, but a higher effect is sought. If it is, it is preferable that melting | fusing point of all the disperse dyes contained in these ink shall be 150 degreeC or more.

  The content of the disperse dye in the ink is preferably 0.05 to 20% by weight with respect to the total amount of the ink. If the content is less than 0.05% by weight, sufficient coloring cannot be obtained, and if it exceeds 20% by weight, it becomes excessive and the cost is increased.

  The average particle size of the disperse dye in the ink is preferably 0.01 to 0.35 μm, and more preferably 0.02 to 0.30 μm. This is because the discharge from the inkjet nozzle can be stably performed within this range.

  The ink contains at least a color material, a color material dispersant, and an aqueous solvent.

  As the dispersant, any of an anionic compound containing an anionic surfactant and a nonionic compound containing a nonionic surfactant can be used. Examples of the anionic compound include fatty acid salts, alkyl sulfate salts, alkylbenzene sulfones. Acid salts, alkyl naphthalene sulfonates, lignin sulfonates, dialkyl sulfosuccinates, alkyl phosphate esters, naphthalene sulfonate formalin condensates, polyoxyethylene alkyl sulfates and substituted derivatives thereof, etc. as nonionic compounds Is polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alcohol Triethanolamine, glycerol fatty acid ester, and an oxyethylene oxypropylene block polymer and their substituted derivatives.

  The content of the dispersant in the ink is preferably 0.1 to 15% by weight and more preferably 0.5 to 10% by weight with respect to the total amount of the ink. When the content of the dispersant is less than 0.1% by weight, it cannot be adsorbed to the entire disperse dye particles present in the water-soluble dye, and the disperse particles exhibit aggregation, and the coarsened particles are settled. If the amount exceeds 15% by weight, the dispersant present without adsorbing to the dispersed particles in the ink may precipitate and agglomerate to reduce the stability of the ink. is there.

  The aqueous solvent can contain an auxiliary solvent in addition to water. Examples of the auxiliary solvent include water-compatible organic solvents, and examples of the organic solvent include alcohols such as methyl alcohol, ethyl alcohol, propyl alcohol, diethylene glycol, and glycerin.

  The ink used in the present invention may further contain a preservative and an antifoaming agent. Preservatives include imidazole compounds such as 2- (4-thiazolyl) benzimidazole, methyl 2-benzimidazole carbamate, 1,2-benzthiazoline-3-one, 2-n-octyl-isothiazoline-3-one And other compounds such as iodo, nitrile, phenol, haloalkylthio, pyridine, triazine, and bromine. Examples of antifoaming agents include organic polar compounds such as lower alcohols, oleic acid, polypropylene glycol, and silicone resins.

  Various dispersers such as conventionally known ball mills, sand mills, roll mills, line mills and sand grinders can be used as the dispersers used when the disperse dye is converted into ink.

  Polyester fibers include polyethylene terephthalate (PET) fiber, cationic dyeable polyester (CDP) fiber, polybutylene terephthalate (PBT) fiber, polytrimethylene terephthalate (PTT) fiber, wholly aromatic polyester fiber, polylactic acid fiber, etc. In addition, the polyurethane fibers are generally classified into two types, ether type and ester type, and any of them may be used without any particular limitation. Polyurethane fibers are often used by covering other fibers such as PET fibers around the polyurethane fibers (covered, core span) than when used with bare yarn. In order to prevent exposure to the front surface, it is positioned inside or on the back surface of the fabric, and a device is devised so that the polyurethane fiber is not directly exposed to light as much as possible.

  The form of the mixed fabric to be subjected to inkjet printing according to the present invention may be any form such as a woven fabric, a knitted fabric, and a non-woven fabric, and is not particularly limited.

  Prior to inkjet printing of a mixed fabric composed of polyester fibers and polyurethane fibers according to the present invention, the mixed fabric is preferably pretreated. As the pretreatment agent used for such pretreatment, a water-soluble polymer, a water-insoluble inert organic compound, a flame retardant, an ultraviolet absorber, a reduction inhibitor, an antioxidant, a pH adjuster, a hydrotrope agent, an antifoaming agent, Penetration agents, microporous forming agents, and the like can be exemplified.

  Examples of water-soluble polymers include carboxymethyl cellulose, sodium alginate, guar gum, locust bean gum, gum arabic, crystal beer gum, methyl cellulose, polyacrylamide, starch, sodium polyacrylate, sodium polystyrene sulfonate, hydroxyethyl cellulose, and polyvinyl alcohol. A functional polymer.

  When the surface of the blended fabric is pretreated with a water-insoluble inert organic compound, the surface of the blended fabric becomes smooth and the surface of the fibers can be uniformly hydrophobicized, so that the ink can be uniformly applied to the fabric surface. it can. For this reason, a water-insoluble inert organic compound can be used more preferably. As the water-insoluble inert organic compound, an organic monomer, oligomer or low molecular weight polymer having a melting point of 40 to 150 ° C. is used. These number average molecular weights are usually 10,000 or less, preferably 5000 or less, and more preferably 100 to 2000.

  Examples of such water-insoluble inert organic compounds include low molecular weight synthetic resins, hydrocarbon wax compounds, natural wax compounds, higher fatty acid amide compounds, higher alcohol compounds, polyhydric alcohol higher fatty acid ester compounds, and the like. Preferably, lower alkylene polymer compounds such as polyethylene, paraffin wax and polyethylene wax, hydrocarbon wax compounds such as petrochemical synthetic waxes such as microcrystalline wax, petrolatum, and Fischer-Tropsch wax, ethylene bis stearamide , Stearic acid amide, oleic acid amide, methylol stearamide, higher fatty acid amide compounds such as 12-hydroxystearic acid amide, glycerin oleic acid ester, glycerin steari Esters, propylene glycol monostearate, ethylene glycol monostearate, polyhydric alcohol such as 12-hydroxystearic acid ester - Le higher fatty acid ester-based compounds. Of these, a mixture of a hydrocarbon wax and the other is particularly preferable because of its excellent emulsifying dispersibility.

  Examples of the flame retardant include a halogen flame retardant, a phosphorus flame retardant, and an inorganic flame retardant. Examples of the ultraviolet absorber include benzotriazole and benzophenone. Examples of the reduction inhibitor include nitrobenzene sulfonate and benzene sulfonic acid derivatives. Examples of the antioxidant include hindered amines and hindered phenols.

  Examples of pH adjusters include acidic adjusters such as malic acid, citric acid, acetic acid, ammonium citrate, and potassium dihydrogen phosphate, and alkaline adjusters such as sodium bicarbonate, sodium carbonate, disodium hydrogen phosphate, and sodium acetate. Is mentioned. By finely adjusting the pH by changing the addition amount of the pH adjuster, it is possible to finely control the dyeing property of each fiber constituting the mixed fabric, which is preferable.

  Examples of hydrotropes include urea, polyethylene glycol, thiourea and the like. Examples of the antifoaming agent include organic polar compounds such as lower alcohols, oleic acid, and polypropylene glycol, and silicone resins. Examples of the penetrant include anionic surfactants such as sodium dodecylbenzenesulfonate, sodium lauryl sulfate, and butyl oleate, and nonionic surfactants such as nonylphenol and lauryl alcohol.

  As the microporous forming agent, a liquid obtained by uniformly emulsifying and dispersing a low boiling liquid having a boiling point of 105 to 200 ° C. in a fine particle state in water is preferably used. Such low boiling point liquids include hydrocarbon-based toluene, xylene, halogenated hydrocarbon-based perchlorethylene, monochlorobenzene, dichloropentane, butyl acetate, butyl acrylate, and the like.

  Examples of the method for applying the pretreatment agent containing the above components to the mixed fabric include a pad method, a spray method, a dip nip method, a coating method, a laminating method, a gravure method, and an ink jet method, and any method is used. be able to.

  The ink jet recording apparatus used in the ink jet textile printing method of the present invention is not particularly limited. For example, a continuous method such as a charge modulation method, a micro dot method, a charge ejection control method and an ink mist method, an on-demand method such as a piezo method, a bubble jet (registered trademark) method, and an electrostatic suction method can be used. .

  Furthermore, in the inkjet printing method of the present invention, after inkjet printing on a fabric, the fabric is heat-treated at 150 to 180 ° C. for the purpose of dyeing disperse dyes and coloring. If the temperature is lower than 150 ° C, the dye may be poorly developed, and if the temperature is higher than 180 ° C, the fabric may be yellowed or deteriorated. The heat treatment time is 0.5 to 60 minutes. If the time is shorter than 0.5 minutes, color unevenness may occur, and if it exceeds 60 minutes, the dye may fade. As heat treatment conditions, it is more preferable to heat at 150 to 160 ° C. for 5 to 30 minutes.

  After the heat treatment, the printed matter of the present invention can be obtained by generally washing and drying the ink-jet printed fabric. As typical uses of the printed matter of the present invention, sports such as swimwear, and clothing such as inners such as shorts can be exemplified.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.

[Preparation of ink]
18% by weight of the disperse dye described in Table 1 below, 8% by weight of the dispersant (lignin sulfonate, anionic surfactant), and 0.1% of the preservative (Sun Ibach IT20, manufactured by Sanai Oil Co., Ltd.) % By weight, defoaming agent (Shin-Etsu Silicone KM-70, manufactured by Nissin Gaku Kogyo Co., Ltd.) 0.05% by weight, and pure water 73.85% by weight were mixed in a sand mill in the presence of glass beads. After wet milling for a period of time to form fine particles, the glass beads were removed by suction filtration to prepare inkjet inks (R1 to B3, Y1) shown in Table 1 below.

  The melting point of the disperse dyes described in Table 1 was measured using a differential scanning calorimeter (manufactured by Bruker AXS).

[Pretreatment of mixed fabric]
A pretreatment agent prepared by the following formulation was applied to the mixed fabric before inkjet printing by the dip nip method. After the dip nip treatment, the mixed fabric was dried at 120 ° C. for 130 seconds by a tenter dryer.

(Preparation of pretreatment agent)
Carboxymethylcellulose (water-soluble polymer, fine gum HE, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 5.0 parts by weight, malic acid (pH adjuster, manufactured by Fuso Chemical Industry Co., Ltd.) 0.3 parts by weight, MS -A pretreatment agent was prepared by mixing 2.0 parts by weight of liquid (reduction inhibitor, manufactured by Meisei Chemical Industry Co., Ltd.) and 92.7 parts by weight of pure water.

[Inkjet printing method]
A 5 × 5 cm pattern was printed using an on-demand type serial scanning inkjet method so that the amount of ink applied to the fabric was 20 nl / mm ² .

Example 1
The above-mentioned pretreatment was performed on a 2-way tricot composed of 80% by weight of PET fibers and 20% by weight of polyurethane fibers, and then printed by the above-described ink jet printing method using the red ink R1. Next, the fabric was wet-heat treated at 160 ° C. for 20 minutes, then subjected to reduction washing at 70 ° C. for 20 minutes under conditions of soda ash 2 g / L and hydro 2 g / L, and dried and printed at 170 ° C. for 1 minute. I got a thing.

Example 2
A printed material was obtained in the same manner as in Example 1 except that R2 was used as the red ink.

Comparative Example 1
A printed material was obtained in the same manner as in Example 1 except that R3 was used as the red ink.

Reference example The above-mentioned pretreatment was performed on a 2-way tricot composed of 85% by weight of cationic dyeable polyester fiber and 15% by weight of polyurethane fiber, and then printed by the above ink jet printing method using inks R2, B1 and Y1. . Next, the fabric was heat-moisture treated at 160 ° C. for 20 minutes, and then subjected to reduction cleaning at 90 ° C. for 20 minutes under the conditions of caustic soda 2 g / L, thiourea 2 g / L, hydro 2 g / L, and 170 ° C. × The printed matter was obtained by drying for 1 minute.

Comparative Example 2
The above-mentioned pretreatment was performed on a 2-way tricot composed of 85% by weight of cationic dyeable polyester fiber and 15% by weight of polyurethane fiber, and then printed by ink jet printing using inks R3, B1 and Y1. Next, the fabric was heat-moisture treated at 160 ° C. for 20 minutes, and then subjected to reduction cleaning at 90 ° C. for 20 minutes under the conditions of caustic soda 2 g / L, thiourea 2 g / L, hydro 2 g / L, and 170 ° C. × The printed matter was obtained by drying for 1 minute.

〔Evaluation method〕
The printed matter obtained in Example 1, Example 2, Reference Example and Comparative Examples 1 and 2 was evaluated by the following evaluation methods. The results are shown in Table 2.

[Wet fastness]
Washing fastness was measured based on JIS L0844 A-2 method, and contamination of attached white cloth was determined based on JIS L0801.

[Dry cleaning liquid contamination]
The dry cleaning fastness was measured based on JIS L0860 A method, and the contamination of the dry cleaning liquid was determined based on JIS L0801.

[Blind]
The obtained printed matter was pulled by hand, and the hue of polyurethane inside the fabric was visually confirmed.
1: The polyurethane fiber looks white without being dyed.
2: Although it is dyed, the hue is different from that of the fabric surface.
3: The hue is almost the same as the surface of the fabric.

Claims (3)

A method for ink-jet printing a mixed fabric composed of polyester fibers (excluding cationic dyeable polyester fibers) and polyurethane fibers, and having a melting point of 150 ° C. or higher as a color material of red ink for the mixed fabric An ink jet printing method, wherein ink jet printing is performed using a disperse dye having the above. The red ink is C.I. I. 2. The ink jet printing method according to claim 1, comprising at least one disperse dye selected from the group consisting of Disperse Red 60, 86, 152, 177, 179, 343 and 202. A printed matter printed by the ink jet printing method according to claim 1 or 2.