Dyeing methods for polyester fibers

Abstract

To allow for the dyeing of polyester-based fibers with natural dyes without the need for pretreatments such as cationization.SOLUTION: The present invention provides a dyeing method for dyeing polyester-based fibers with a dye solution or printing paste that contains natural dyes, dye mordants, and chelating agents.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a method for dyeing polyester fibers, and particularly to a method for dyeing polyester fibers using natural dyes.

Background Art

[0002] In recent years, due to the impetus of giving an eco-friendly image, efforts to dye fiber products using natural dyes have attracted attention. Among fiber products, chemical fibers account for more than 60% of the production ratio by fiber type, and polyester fibers account for the largest proportion among these chemical fibers. It is known that polyester fibers usually do not dye with natural dyes. Conventionally, polyester fibers are dyed with natural dyes by performing pretreatment on polyester fibers with a cationizing agent or the like, using modified polyester, or modifying the natural dyes themselves (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the method of pre-cationizing polyester fibers as described above, it is difficult to perform dyeing using natural dyes in the conventional process with general equipment used in dyeing factories for dyeing polyester. That is, it is necessary to add a new process for performing pretreatment such as cationization, and in some cases, the entire equipment needs to be reviewed, so it could not be easily performed with the existing equipment. Furthermore, when performing pretreatment, the amount of drainage increases due to an increase in the number of processes, and the amount of carbon dioxide emissions due to heating also increases, resulting in a result that goes against being eco-friendly.

[0005] This invention was made to solve these problems, and its main objective is to enable polyester fibers to be dyed with natural dyes without the need for pretreatment such as cationization. [Means for solving the problem]

[0006] In other words, a method for dyeing polyester fibers according to one embodiment of the present invention is characterized by including an immersion dyeing step in which polyester fibers are immersed in a dye solution containing a natural dye, a mordant, and a chelating agent. Another embodiment of the present invention relates to a method for dyeing polyester fibers, characterized by including a printing step of printing polyester fibers using a printing paste containing a natural dye, a mordant, and a chelating agent. [Effects of the Invention]

[0007] According to the present invention configured in this way, polyester fibers can be dyed with natural dyes without the need for pretreatment such as cationization. [Modes for carrying out the invention]

[0008] In order to solve the above problems, the inventors diligently investigated and discovered for the first time that polyester fibers can be dyed without pretreatment such as cationization by using a dye solution or printing paste prepared by mixing a dye solution, a mordant, and a chelating agent. The reason why polyester fibers can be dyed without pretreatment by using a dye solution or printing paste containing natural dyes, mordants, and chelating agents is still unclear. The mechanism that the inventors believe to be based on the knowledge obtained to date is described below. Please note that the following explanation of the mechanism is not intended to limit the technical scope of the present invention.

[0009] In other words, by mixing natural dyes with mordants, color development and lake formation occur through coordination bonds, preventing the natural dyes from dissolving in the solution. Furthermore, by mixing in a chelating agent that has the ability to chelate metal ions, it is possible to prevent the laked natural dyes from becoming pigments and settling in the solution. This prevents both excessive dissolution and excessive settling of the natural dyes in the solution, and it is believed that they can be bonded to polyester fibers and dyed through intermolecular forces such as van der Waals forces.

[0010] As a result, there is no need for pretreatment such as cationization, and polyester fibers can be dyed using natural dyes without adding new equipment or processes, using existing dyeing equipment for disperse dyes.

[0011] The following describes a method for dyeing polyester fibers according to an embodiment of the present invention. The polyester fibers to be dyed using the dyeing method of this embodiment are, for example, obtained using PET fibers, PEN fibers, PTT fibers, PBT fibers, regular polyester fibers, recycled polyester fibers, blended fibers with various fibers such as urethane and cotton, but are not limited to these. Furthermore, the polyester fibers may be any material, such as loose hair, yarn, woven fabric, knitted fabric, or sewn products, but are not limited to these.

[0012] [1] First Embodiment The dyeing method of this embodiment is a dyeing method that dyes the object to be dyed by immersion dyeing, and includes a dye solution preparation step of preparing a dye solution, an immersion dyeing step of immersing the object to be dyed using the prepared dye solution, and a washing step of washing the object to be dyed after immersion dyeing.

[0013] (1) Dye solution preparation process The dye solution prepared in this embodiment contains at least a natural dye, a mordant, and a chelating agent, and may further contain a disperse dye and a dye dissolving agent as needed. The dye solution can be obtained by mixing these raw materials with water in a container. It is preferable to adjust the pH of this dye solution to 4-8 using any pH adjusting agent such as acetic acid or sodium acetate buffer, and more preferably to 4-6.

[0014] If the mordant is added before the chelating agent after the natural dye has been added, metal hydroxides may form in the solution, potentially causing the natural dye to become insoluble and reducing its friction fastness, thus degrading the quality of the dyed material. Therefore, in this dye solution preparation process, it is preferable to add the chelating agent to the container after adding the natural dye and before adding the mordant. This suppresses the insolubilization of the natural dye and makes it easier to dye polyester fibers. The other raw materials may be added in any order.

[0015] Natural dyes may be of animal or plant origin, and are preferably those that bind with a mordant. Specific examples of natural dyes include, but are not limited to, dried materials such as turmeric root, gardenia fruit, Japanese pagoda tree flower buds, bayberry bark, golden scutellaria bark, pomegranate peel, sumac galls, myrobalan fruit, clove buds, betel nut seeds, walnut peel, catechu trunk wood, tangara bark, madder root, sappanwood heartwood, lac dye, cochineal insect bodies, logwood heartwood, or extracts obtained by hot water extraction from these materials. Natural dyes may be used individually or in combination of two or more.

[0016] The amount of natural dye in the dye solution may be adjusted as appropriate depending on its type, condition, and extraction method. If the natural dye content is too low, the dyeing result (color) may not appear on the polyester fibers. Therefore, the natural dye content is preferably 0.2% owf or more, more preferably 0.5% owf or more, and even more preferably 1.0% owf or more as a liquid plant dye. On the other hand, if the natural dye content is too high, it will lead to increased costs and darkening of wastewater. Therefore, the natural dye content is preferably 200% owf or less, more preferably 100% owf or less, and even more preferably 50% owf or less as a liquid plant dye.

[0017] For example, when performing hybrid dyeing with chemical dyes and extracting the dried material with hot water, the amount of natural dye is preferably about 10% owf or more and about 200% owf or less in terms of solid matter, and more preferably about 10% owf or more and about 40% owf or less. In this case, the extraction conditions are preferably to pulverize the dried natural dye with a mill mixer or the like, weigh out 20 to 40 g or less, add hot water to make 1 liter, heat this at 80 to 90°C for 30 minutes, and then filter it. Furthermore, when using natural pigment extracts derived from nature, the amount of natural dye is preferably about 1% owf or more and about 20% owf or less in terms of solid matter, and more preferably about 1% owf or more and about 4% owf or less. When using liquid plant dyes (manufactured by Tanaka Naoshi Dye Shop), about 2% owf or more and 100% owf or less is good, and even more preferably about 2% owf or more and 10% owf or less.

[0018] The mordant is preferably, but not limited to, a metal salt such as tin, aluminum, copper, titanium, or iron. When performing closed-type high-pressure dyeing or carrier dyeing, the mordant is particularly preferably a metal salt of tin, aluminum, or titanium. As a tin mordant, tin chloride is preferred; as an aluminum mordant, water-soluble aluminum acetate or potassium aluminum sulfate is preferred; as a copper mordant, copper sulfate or copper acetate is preferred; as a titanium mordant, titanyl sulfate or titanium chloride is preferred; and as an iron mordant, iron sulfate, iron chloride, or iron acetate is preferred, but not limited to these. The dye solution may contain one or more types of mordants selected from these, but it is preferable to contain one type of mordant from the viewpoint of reproducibility of the hue of natural dyes.

[0019] The mordant content may be adjusted as appropriate depending on the amount of natural dye used. In the relationship between most natural dyes (aglycones) and mordants, it is known that the mordant binds to the natural dye in a molar ratio of 1.0 to 3.0. Because the natural dye and mordant bind in a constant ratio, it is preferable to increase the amount of mordant as the amount of natural dye increases. However, if there is too little mordant relative to the natural dye, undyed dye will remain in the dyeing bath, resulting in poor dye utilization efficiency. For the aforementioned preferred amount of natural dye, a mordant concentration of 0.2% owf or higher is preferred, more preferably 0.5% owf or higher, and even more preferably 1% owf or higher. Conversely, if there is too much mordant relative to the dye, the amount of metal in the dyeing wastewater increases, placing a heavy burden on wastewater treatment. In the aforementioned preferred amount of natural dye used, the mordant solution for immersion dyeing (manufactured by Tanaka Naoshi Dye Shop) is preferably 200% owf or less, more preferably 100% owf or less, and even more preferably 50% owf or less.

[0020] A chelating agent is a stabilizer having chelating ability for metal ions and is also called a metal ion stabilizer. Specifically, this chelating agent is one or more selected from malic acid, lactic acid, tartaric acid or citric acid, tripolyphosphoric acid, ethylenediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethylenediphosphonic acid or aminocarboxylic acid, etc. These chelating agents may be in the state of free acid or in the state of sodium salt or the like.

[0021] The amount of the chelating agent is preferably adjusted according to the amount of the metal of the mordant to be added. If the chelating agent is too little for the mordant, precipitation may occur in the dyeing bath, making it difficult to dye and resulting in a poor-quality dyed product that is easily decolorized. Conversely, if the chelating agent is too much for the mordant, it may inhibit the coordination bond between the natural dye and the mordant, and there is a risk that the polyester fiber cannot be dyed. For example, in the case where the metal (mordant metal) of the mordant to be added and the chelating agent bind at a ratio of 1:1, with the content of the mordant being 1, it is preferably contained at a molar ratio of the chelating agent of 0.5 or more and 2.0 or less, more preferably at a molar ratio of 0.8 or more and 1.5 or less, and most preferably added at a ratio of 1:1. In the above-mentioned suitable amount of the natural dye used, it is preferably 0.2% o.w.f or more, more preferably 0.5% or more, and even more preferably 1% or more as Aninol ALB (manufactured by Tanaka Naoshi Dye Shop Co., Ltd.). It is preferably 200% o.w.f or less, more preferably 100% o.w.f or less, and even more preferably 50% o.w.f or less.

[0022] As the disperse dye, any one can be used. For example, Sumikaron Yellow ERPD (manufactured by Sumitomo Chemical Co., Ltd.), Sumikaron Red ERPD (manufactured by Sumitomo Chemical Co., Ltd.), Sumikaron Blue ERPD (manufactured by Sumitomo Chemical Co., Ltd.), Sumikaron Turquoise Blue SGL (manufactured by Sumitomo Chemical Co., Ltd.), Dianix B.Red BSE (manufactured by DyStar), Polyron series (manufactured by Tanaka Naoshi Dye Shop Co., Ltd.), etc. can be mentioned.

[0023] Examples of the dye solvent include solvent systems such as naphthalene sulfonic acid formaldehyde polycondensate, polyoxyethylene alkyl ether sulfate, and polyhydric alcohol. When using a highly lipophilic natural dye, it is preferable to use polyoxyethylene alkyl ether sulfate or a polyhydric alcohol system as the dye solvent. When using a glycoside having particularly high solubility as the main component of the dye, it may not be necessary to add a dye solvent.

[0024] If the content of the dye solvent is large, the dyeing rate of the natural dye may decrease, so it is necessary to adjust according to the solubility of the natural dye and the type of solvent. The content of the dye solvent in the dye solution is preferably, for example, 1 v / v% or more and 20 v / v% or less as aninol S (manufactured by Tanaka Naoshi Dye Shop), more preferably 2 v / v% or more and 10 v / v% or less, and even more preferably 3 v / v% or more and 5 v / v% or less.

[0025] (2) Immersion dyeing process In the immersion dyeing process, the dyed material is immersed using a known dyeing machine with the dye solution obtained in the above process. As the dyeing machine, one suitable for the shape of the dyed material and the conditions of the facility where dyeing is performed may be selected, and examples include a liquid flow dyeing machine, a jigger dyeing machine, a cheese dyeing machine, or a kase dyeing machine. The dyeing conditions may be either normal pressure dyeing or pressure dyeing. When performing normal pressure dyeing, it is preferably carried out at a temperature above the glass transition temperature of the dyed material and 100°C or lower for 15 minutes or more and 30 minutes or less, and more preferably at a temperature of 90°C or higher and 100°C or lower for 20 minutes or more and 30 minutes or less. When performing pressure dyeing, it is preferably carried out at 105°C or higher and 140°C or lower for 15 minutes or more and 30 minutes or less, and more preferably at 120°C or higher and 135°C or lower for 20 minutes or more and 30 minutes or less.

[0026] (3) Washing process After the immersion dyeing process, the dyed material is washed. The washing method may be any known method. For example, after washing the dyed material with water, reduction washing using sodium hydroxide or hydrosulfite may be performed.

[0027] [2] Second embodiment Next, a dyeing method according to the second embodiment will be described. The dyeing method of this embodiment is a dyeing method in which an object to be dyed is dyed by printing, and includes a printing paste preparation step of preparing a printing paste, a printing step of printing the object to be dyed using the prepared printing paste, a steaming step of steaming the object to be dyed after printing, and a washing step of washing the object to be dyed after steaming.

[0028] (1) Process for making printing paste The printing paste prepared in this embodiment contains at least a natural dye, a mordant, and a chelating agent, and may further contain a disperse dye and a dye dissolving agent as needed. The printing paste can be obtained by mixing these raw materials together with the sizing agent and water in a container. Similar to the first embodiment, in this step, it is preferable to add the chelating agent after adding the natural dye and before adding the mordant. Known sizing agents can be used. Furthermore, it is preferable to adjust the pH of this printing paste to 4-8, and more preferably to 4-6, using any pH adjusting agent (e.g., acetic acid or sodium acetate buffer). The type and amount of each raw material added are the same as in the first embodiment.

[0029] (2) Printing process In the printing process, the printing paste obtained in the above process is used to print the material to be dyed using a known printing machine. The printing method may be selected according to the shape of the material to be dyed and the conditions of the dyeing facility, and may include, but is not limited to, screen printing, roll printing, spray or inkjet printing.

[0030] (3) Steaming process In the steaming process, the material to be printed or sprayed with the printing paste is heated (steamed) with steam. The steaming conditions may be known; for example, it may be done using high-pressure steam at 130°C for 10 to 30 minutes, or using high-temperature steam at 170 to 180°C for 5 to 10 minutes. It is preferable to use high-pressure steam at 130°C for 15 to 20 minutes.

[0031] (4) Washing process After the steaming process, the printed material is washed. Any known washing method may be used; for example, the material may be washed with water, followed by a reducing wash using sodium hydroxide or hydrosulfite. [Examples]

[0032] The present invention will be described in more detail below based on specific examples. However, the following examples are merely examples of the present invention, and the present invention is not limited to these examples.

[0033] (1) Example 1 Pre-set polyester corrugated knit was used as a polyester fiber for dyeing (immersion dyeing). Disperse dyes (Dianix Yellow ACE 0.0198%owf, Dianix Red ACE 0.105%owf, Dianix Blue ACE 0.0183%owf, all manufactured by Dystar), natural dye (liquid plant dye Logwood Solution 67, manufactured by Tanaka Naoshi Dye Co., Ltd.) 0.45%owf, mordant for immersion dyeing (aluminum solution for immersion dyeing, manufactured by Tanaka Naoshi Dye Co., Ltd.) 0.45%owf, chelating agent (Aninol ALB, manufactured by Tanaka Naoshi Dye Co., Ltd.) 0.45%owf, and dye accelerator (dye accelerator AN-25, manufactured by Tanaka Naoshi Dye Co., Ltd.) 3g / L were added to hot water, and the pH was further adjusted to around 5 using an acetic acid-sodium acetate buffer solution to obtain the dye solution.

[0034] Here, Aninol ALB is a preparation mainly composed of organic acid salts and is an aluminum ion stabilizer. The aluminum solution for immersion dyeing is a high-concentration aluminum salt preparation adjusted so that the ratio of metal to dye is suitable when used in the same amount as the liquid plant dye. The liquid plant dye Logwood Solution 67 is a liquid natural dye extracted at a high concentration, mainly from hematin contained in logwood heartwood. The dye accelerator AN25 is a dye accelerator for natural dyes and disperse dyes for polyester, consisting of a special nonionic surfactant.

[0035] Liquid plant dyes (manufactured by Tanaka Naoshi Dye Co., Ltd.) are natural dyes extracted from various natural materials using a mixed solvent. The number at the end of the product name indicates the weight (g) of the raw plant material (dried) used to prepare 100g of the product. For example, if it is Sophora japonica sapwood 25, then 25g of Sophora japonica flower buds were used to extract the pigment in order to produce 100g of Sophora japonica sapwood 25. Furthermore, both the mordant for immersion dyeing (manufactured by Tanaka Naoshi Dye Co., Ltd.) and the one-solution mordant described later (manufactured by Tanaka Naoshi Dye Co., Ltd.) are liquid mordants in which the concentrations of various metals are adjusted to 0.45 to 0.55 mol / L.

[0036] Then, using this dye solution, 5 kg of material to be dyed was dyed (immersed) in a jet dyeing machine with a bath ratio of 1:12, starting at 60°C and gradually increasing to 90-100°C for 30 minutes.

[0037] The dyed material was then rinsed with water, and further reduced washing was performed using a washing solution (3 g / L sodium carbonate, 3 g / L hydrosulfite) at a bath ratio of 1:20 at 80°C for 20 minutes. After that, the dyed material was rinsed with hot water at 60°C for 15 minutes, immersed in a 1 ml / L acetic acid solution, and then rinsed with water to finish.

[0038] This resulted in a uniform, light-colored, reddish-blue hybrid dyed fabric with a pleasant texture. When the resulting dyed fabric was subjected to a lightfastness test, it met the standards of Grade 3 or higher (dyeing cooperation: Iida Textile Co., Ltd.; Osaka City).

[0039] (2) Example 2 A refined plain-weave polyester fabric was used as a polyester fiber for dyeing (immersion dyeing). To the material to be dyed, 10% owf of natural dye (liquid plant dye Indian madder solution 22, manufactured by Tanaka Naoshi Dye Co., Ltd.), 10% owf of a chelating agent (Aninol ALB, manufactured by Tanaka Naoshi Dye Co., Ltd.), 10% owf of a mordant (aluminum solution for immersion dyeing, manufactured by Tanaka Naoshi Dye Co., Ltd.), and 3 g / L of a dye accelerator (dye accelerator AN-25, manufactured by Tanaka Naoshi Dye Co., Ltd.) were added to hot water. The pH was then adjusted to approximately 5 using an acetic acid-sodium acetate buffer solution, and this was used as the dye solution. Note that liquid plant dye Indian madder solution 22 is a liquid natural dye extracted at high concentration, primarily from anthraquinone dyes contained in the roots of Indian madder.

[0040] Then, using this dye solution, the fabric was dyed (immersion dyed) in a beaker dyeing machine at a bath ratio of 1:50, starting with cold water and gradually increasing the temperature to 100°C for 30 minutes. After that, the fabric was washed with water, and then soaped with a washing solution (Tanaclean EX, manufactured by Tanaka Naoshi Dye Co., Ltd., 2 ml / L) at a bath ratio of 1:20 at 80°C for 10 minutes. As a result, a plain weave fabric with a good texture and a vermilion color, using madder with aluminum mordant and 100% natural dye, was obtained.

[0041] (3) Example 3 Polyester knit fabrics that had been scoured and heat-set were used as polyester fibers for dyeing (immersion dyeing). To the material to be dyed, a 5% owf solution of natural dye (Sophora japonica liquid plant dye 25K, manufactured by Tanaka Naoshi Dye Co., Ltd.), a 5% owf solution of chelating agent (Aninol W, manufactured by Tanaka Naoshi Dye Co., Ltd.), a 5% owf solution of mordant (tin solution for immersion dyeing, manufactured by Tanaka Naoshi Dye Co., Ltd.), and a 1% owf solution of disperse dye (Sumikalon Yellow ERPD, manufactured by Sumitomo Chemical Co., Ltd.) were added to hot water. The pH was then adjusted to approximately 5 with an acetic acid-sodium acetate buffer solution to create the dye solution. The Sophora japonica liquid plant dye 25K is a liquid natural dye extracted primarily from the pigment (aglycone) in Sophora japonica flower buds. The tin solution for immersion dyeing is a high-concentration tin salt preparation adjusted so that the ratio of metal to pigment remains constant when used in the same amount as the liquid plant dye.

[0042] Using this dye solution, dyeing (immersion dyeing) was performed in a jet dyeing machine with a bath ratio of 1:50, starting with cold water and gradually increasing the temperature, at 120°C for 30 minutes. After rinsing with water, soaping was performed using a soaping agent (Tanaclean EX (manufactured by Tanaka Naoshi Dye Co., Ltd.) 2 ml / L) with a bath ratio of 1:20 at 80°C for 10 minutes. As a result, a hybrid type of yellow knit with a good texture was obtained using tin mordant and disperse dye on Japanese pagoda tree.

[0043] (4) Example 4 Plain weave polyester fabric was used as a polyester fiber for dyeing (printing), and a tie-dye pattern was printed by layering five plates.

[0044] The printing paste used for each of the five plates was a mixture of natural dye-adjusted paste and synthetic dye-adjusted paste in a weight ratio of 2:8. The natural dye-adjusted paste was prepared by weight as follows: natural dye (liquid plant dye, manufactured by Tanaka Naoshi Dye Co., Ltd.) 25%, mordant (one-solution mordant, manufactured by Tanaka Naoshi Dye Co., Ltd.) 25%, and sizing agent (ND Printing Paste P, manufactured by Tanaka Naoshi Dye Co., Ltd.) 50%, with the total weight being 100%. The synthetic dye-adjusted paste consisted of 60% sizing agent (CMC-based base paste, manufactured by Yamako Chemical Dye Co., Ltd.), water, and disperse dye, totaling 100%. ND Printing Paste P (manufactured by Tanaka Naoshi Dye Co., Ltd.) is a compound formulation of a natural-derived sizing agent, dye solvent, and metal ion stabilizer that can be mixed with natural dyes and metal salts for autoscreen printing. The printing pastes for plates 1-5 were prepared as follows.

[0045] For the first printing plate, the natural dye paste was prepared using Logwood Solution 67 as the natural dye and a one-component iron solution as the mordant. For the first printing plate, the synthetic dye paste was prepared using 0.165g of Dianix Polyester Yellow 4GS (manufactured by Dystar), 0.014g of Kiwaron Polyester Red TL-SF (manufactured by Kiwa Chemical Industry Co., Ltd.), and 0.433g of Blended Blue BG-SF (manufactured by Yamako Chemical Dyeing Co., Ltd.) as disperse dyes. Logwood Solution 67 is a liquid natural dye extracted at a high concentration, with hematin, contained in logwood heartwood, as the main component. The one-component iron solution is an iron salt preparation that is adjusted so that the ratio of metal to pigment is constant when used in the same amount as the liquid plant dye, and it also contains components that delay insolubilization with the pigment.

[0046] The natural dye paste for the second plate was prepared using logwood solution 67 as the natural dye and a one-component aluminum solution as the mordant. The synthetic dye paste for the second plate was prepared using 0.110g of Dianix Polyester Yellow 4GS (manufactured by Dystar) and 0.131g of Blended Blue BG-SF (manufactured by Yamamitsu Chemical Co., Ltd.) as disperse dyes. The one-component aluminum solution is an aluminum salt preparation that is adjusted so that the ratio of metal to pigment is constant when used in the same amount as the liquid plant dye, and also contains components that delay the insolubilization with the pigment.

[0047] For the 3rd edition, the natural dye paste was prepared using Suou Solution 67 as the natural dye and a one-component aluminum solution as the mordant. For the 3rd edition, the synthetic dye paste was prepared using 1.487g of Dianix Polyester Yellow 4GS (manufactured by Dystar), 0.046g of Kiwaron Polyester Red TL-SF (manufactured by Kiwa Chemical Industry Co., Ltd.), and 0.043g of Blended Blue BG-SF (manufactured by Yamako Chemical Dyeing Co., Ltd.) as disperse dyes. Suou Solution 67 is a liquid natural dye extracted at a high concentration, with brazylein, contained in the heartwood of the Suou tree, as the main component.

[0048] For the 4th printing plate, the natural dye paste was prepared using turmeric solution 50 as the natural dye and a one-solution iron solution as the mordant. For the 4th printing plate, the synthetic dye paste was prepared using 0.229g of Dianix Polyester Yellow 4GS (manufactured by Dystar), 0.031g of Kiwaron Polyester Red TL-SF (manufactured by Kiwa Chemical Industry Co., Ltd.), and 0.035g of Blended Blue BG-SF (manufactured by Yamako Chemical Dyeing Co., Ltd.) as disperse dyes. Turmeric solution 50 is a liquid natural dye extracted at a high concentration, with curcumin, found in turmeric roots, as the main component.

[0049] For the 5th printing plate, the natural dye paste was prepared using turmeric solution 50 as the natural dye and a one-component iron solution as the mordant. For the 5th printing plate, the synthetic dye paste was prepared using blended blue BG-SF (manufactured by Yamamitsu Chemical Co., Ltd.) 0.035g and Sumikalon turquoise blue S-GL (manufactured by Sumitomo Chemical Co., Ltd.) 0.037g as disperse dyes.

[0050] Then, using the prepared printing paste, 1 to 5 plates were printed and dried using an automatic screen printing machine, followed by steam treatment at 172°C for 8 minutes.

[0051] After rinsing the dyed material with water, it was washed for 1 minute at 85°C with a washing solution containing 2% caustic soda and 2% Prebender RD30 (manufactured by Kotani Chemical Industry Co., Ltd.). Then, 2% hydrosulfite was added to the washing solution and the washing was repeated for another minute. This RC washing was repeated once more, and then the material was rinsed with water.

[0052] This resulted in a multi-colored tie-dye print fabric in shades of green, produced using a hybrid of natural and synthetic dyes. While the texture felt slightly stiffer, it was within an acceptable range.

[0053] (5) Example 5 Polyurethane-blend polyester knit was used as a polyester fiber for dyeing (printing).

[0054] Based on weight, 80 parts of sizing agent (ND Printing Paste P, manufactured by Tanaka Naoshi Dye Co., Ltd.), 5 parts of mordant (one-component aluminum solution, manufactured by Tanaka Naoshi Dye Co., Ltd.), 5 parts of natural dye (liquid plant dye, Sophora japonica solution 25K, manufactured by Tanaka Naoshi Dye Co., Ltd.), and 5 parts of disperse dye (Polylon Turquoise Blue G, manufactured by Tanaka Naoshi Dye Co., Ltd.) were uniformly mixed, and an appropriate amount of water was added to make the printing paste. The liquid plant dye, Sophora japonica solution 25K, is a liquid natural dye obtained by extracting Sophora japonica flower bud pigment (aglycone) to a high concentration using a mixed solvent. Polylon is a product in which selected disperse dyes are dispersed in water.

[0055] Using this printing paste, a stripe pattern was printed onto the material using an automatic screen printing machine. After drying at 120°C for 30 seconds, a moist heat treatment was performed with high-pressure steam at 130°C for 20 minutes. After rinsing with water, a reducing wash was performed at 80°C for 10 minutes with a bath ratio of 1:20 using a washing solution of Tanaclin EX (manufactured by Tanaka Naoshi Dye Co., Ltd.) 2 ml / L, hydrosulfite 1 g / L, and sodium hydroxide 1 g / L.

[0056] This resulted in a high-quality knit fabric with a hybrid type of green stripe pattern, achieved by mixing yellow and blue disperse dyes using aluminum mordant from the Japanese pagoda tree.

[0057] (6) Example 6 Refined polyester velvet was used as a polyester fiber for dyeing.

[0058] Dye solution 1 was prepared by uniformly mixing 4(V / V)% of a dye solvent (Aninol S, manufactured by Tanaka Naoshi Dye Co., Ltd.), 0.2(V / V)% of a chelating agent (Aninol W, manufactured by Tanaka Naoshi Dye Co., Ltd.), 5(V / V)% of a mordant (one-solution aluminum solution, manufactured by Tanaka Naoshi Dye Co., Ltd.), 5(V / V)% of a natural dye (liquid plant dye Sophora japonica solution 25K, manufactured by Tanaka Naoshi Dye Co., Ltd.), 3(V / V)% of a thickener (Levelin E, manufactured by Tanaka Naoshi Dye Co., Ltd.), and the remainder with water to make 100%. Note that liquid plant dye Sophora japonica solution 25K is a liquid natural dye obtained by extracting Sophora japonica flower bud pigment (aglycone) to a high concentration using a mixed solvent. Aninol S is a dye solvent whose main component is a polycondensate of naphthalene sulfonic acid and formaldehyde, while Aninol W is a metal ion stabilizer whose main component is an organic acid salt. Revelin E is a thickening agent whose main component is a natural polysaccharide.

[0059] Dye solution 2 was prepared by uniformly mixing 4(V / V)% of a dye solvent (Aninol S, manufactured by Tanaka Naoshi Dye Co., Ltd.), 0.2(V / V)% of a chelating agent (Aninol W, manufactured by Tanaka Naoshi Dye Co., Ltd.), 5(V / V)% of a mordant (one-solution titanium solution, manufactured by Tanaka Naoshi Dye Co., Ltd.), 5(V / V)% of a natural dye (liquid plant dye Indian madder solution 22, manufactured by Tanaka Naoshi Dye Co., Ltd.), 3(V / V)% of a thickener (Levelin E, manufactured by Tanaka Naoshi Dye Co., Ltd.), and the remainder with water to make 100%. 22 is a liquid natural dye extracted at a high concentration, primarily from anthraquinone-based dyes found in the roots of Rubia tinctoria. The one-component titanium solution is a titanium salt preparation that is adjusted so that the ratio of metal to pigment remains constant when used in the same amount as the liquid plant dye, and also contains components that delay insolubilization with the pigment.

[0060] Next, dye solution 1 was sprayed onto the material to be dyed, followed by dye solution 2. After drying, the material was steam-treated at 130°C for 20 minutes using high-pressure steam, and then rinsed with water. Then, soaping was performed 10 times at 80°C with a bath ratio of 1:20 using a washing solution (Tanaclean EX 2 ml / L, manufactured by Tanaka Naoshi Dye Co., Ltd.).

[0061] This resulted in a velvet with a pleasant texture, featuring a 100% natural dye type with a blended multi-color composition of yellow, coral pink, and fabric white, achieved by using aluminum mordant for Japanese pagoda tree and titanium mordant for madder.

Claims

1. A dye solution preparation step involves preparing a dye solution containing a natural dye, a mordant, and a chelating agent having chelating ability for the mordant. The process includes a dyeing step of immersing polyester fibers with the aforementioned dye solution, A method for dyeing polyester fibers, wherein in the dye solution preparation step, the chelating agent is added after the natural dye is added, but before the mordant is added.

2. The method for dyeing polyester fibers according to claim 1, wherein the dye solution contains the chelating agent in a molar ratio of 0.5 to 2.0, with the mordant content being 1.

3. The method for dyeing polyester fibers according to claim 1, wherein the dye solution contains the mordant in a molar ratio of 1.0 to 3.0, with the content of the natural dye being 1.

4. The method for dyeing polyester fibers according to claim 1, wherein the dye solution contains, as a chelating agent, one or more free acids or sodium salts selected from malic acid, lactic acid, tartaric acid, citric acid, tripolyphosphate, ethylenediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethylenediphosphonic acid, or aminocarboxylic acid.

5. The method for dyeing polyester fibers according to claim 1, wherein the dye solution further contains a disperse dye.

6. A printing paste preparation step, comprising preparing a printing paste containing a natural dye, a mordant, and a chelating agent having chelating ability for the mordant, The process includes a printing step of printing polyester fibers using the aforementioned printing paste, A method for dyeing polyester fibers, wherein in the process of preparing the printing paste, the chelating agent is added after the natural dye is added, but before the mordant is added.