Composition for deinking agent, deinking agent, and method for producing deinked printed fabric

Abstract

To provide a deinking agent composition with better deinking properties, a deinking agent, and a method for producing deinked printed fabric. [Solution] A deinking agent composition comprising a basic compound and a surfactant.

Description

Technical Field

[0001] The present invention relates to a composition for a deinking agent, a deinking agent, and a method for producing a deinked resist-dyed cloth.

Background Art

[0002] A promotional flag (banner) in which a vertically long rectangular cloth is tied to a pole is installed at the storefronts of various industries mainly in restaurants as a promotional tool. The usage period of the promotional flag is generally about half a month to half a year, and there are problems such as fast rotation and a large amount of waste. In recent years, more attention has been paid to environmental considerations, and the recycling of promotional flags is desired.

[0003] For example, Patent Document 1 discloses a method for decoloring a recycled promotional flag in which a polyester fiber cloth dyed with a disperse dye constituting the promotional flag is treated with a decoloring treatment liquid containing an alkaline agent, a reducing agent, and a nonionic surfactant. According to the decoloring method, since a binder resin is used and pigments and the like are not applied to the polyester fiber cloth, the dye can be easily decolorized from the polyester fiber cloth by the decoloring treatment, and a recyclable promotional flag can be provided.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the conventional composition for a deinking agent described in Patent Document 1, there is a problem that for a promotional flag dyed with a pigment, there is a large amount of residual pigment after decolorization, and it cannot be used as a raw material for chemical recycling (paragraph 0077 of Patent Document 1). Furthermore, since most banners are printed with pigments, recycling these pigment-printed banners contributes to reducing waste.

[0006] The present invention has been made in view of these circumstances, and aims to provide a deinking agent composition, a deinking agent, and a method for producing deinked printed fabric. [Means for solving the problem]

[0007] The present invention has the following aspects. [1] A deinking agent composition comprising a basic compound and a surfactant. [2] The deinking agent composition according to [1], wherein the basic compound comprises one or more compounds selected from the group consisting of basic inorganic compounds and basic organic compounds. [3] The deinking agent composition according to [1] or [2], wherein the HLB value of the surfactant is 1 to 15. [4] The deinking agent composition according to any one of [1] to [3], wherein the pH of the deinking agent composition is greater than 7 and less than or equal to 14. [5] A deinking agent composition according to any one of items [1] to [4], used for deinking printed fabrics printed with pigments.

[0008] A deinking agent comprising a deinking agent composition described in any one of items [6][1] to [5].

[0009] A method for producing a deinked printed fabric, comprising a deinking step of deinking the printed fabric by applying an external force to the printed fabric in the presence of the deinking agent described in [7][6] to obtain a deinked printed fabric. [8] The method for producing a deinked printed cloth according to [7], wherein the processing temperature in the deinking step is 45 to 100°C. [9] The method for producing a deinked printed cloth according to [7], wherein the processing time in the deinking step is 1 to 60 minutes.

[10] A method for producing a deinked printed cloth according to [7], wherein in the deinking step, the deinking agent described in [6], the contact body, and the printed cloth are mixed together, and an external force is applied by bringing the contact body into contact with the printed cloth.

[11] The method for producing a deinked printed fabric according to [7], further comprising a washing step of washing the deinked printed fabric obtained in the deinking step. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a deinking agent composition with better deinking properties, a deinking agent, and a method for producing deinked printed fabric. Specifically, the present invention excels in the ability to remove ink (color paste, pigment printing agent) from printed fabrics (deinking ability). In addition, it also has the property of preventing the removed ink from transferring to areas of the deinked printed fabric where ink was not previously present (white areas) (white area contamination). [Modes for carrying out the invention]

[0011] (Composition for deinking agents) The deinking agent composition of this embodiment is a composition used to remove ink from a printed fabric that has been printed with ink. The deinking agent composition of this embodiment contains a basic compound, which provides good deinking properties, making it particularly useful for deinking printed fabrics printed with pigment-containing inks.

[0012] The pH of the deinking agent composition of this embodiment is preferably greater than 7 and 14 or less, more preferably between 8 and 14, even more preferably between 10 and 14, and particularly preferably between 11 and 14 or more. If the pH of the deinking agent composition of this embodiment is within the above range, the deinking performance will be further improved.

[0013] In this specification, pH refers to the value obtained when measuring a deinking agent composition at 25°C using a pH meter (product name: pH meter F-71, manufactured by Horiba, Ltd.).

[0014] The deinking agent composition of this embodiment comprises a basic compound and a surfactant.

[0015] <Basic compounds> Examples of the basic compound include basic inorganic compounds and basic organic compounds.

[0016] ≪Basic inorganic compounds≫ Examples of the basic inorganic compound include alkali metal hydroxides, alkaline earth metal hydroxides, alkali metal hydrogen carbonates, alkali metal carbonates, and the like. Examples of the alkali metal hydroxide include sodium hydroxide, potassium hydroxide, and the like. Examples of the alkaline earth metal hydroxide include magnesium hydroxide, calcium hydroxide, and the like. Examples of the alkali metal hydrogen carbonate include sodium hydrogen carbonate, potassium hydrogen carbonate, and the like. Examples of the alkali metal carbonate include sodium carbonate, potassium carbonate, and the like.

[0017] ≪Basic organic compounds≫ Examples of the basic organic compound include amines. Specific examples of the amine include ammonia, pyridine, arginine, lysine, triethylamine, triethanolamine, and the like.

[0018] Among the above, basic inorganic compounds are preferred as the basic compound, and alkali metal hydroxides are preferred, and sodium hydroxide or potassium hydroxide is more preferred.

[0019] The basic compound may be used alone or in combination of two or more. The content of the basic compound is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, and still more preferably 0.5% by mass or more based on the total amount of the composition for the deinking agent of the present embodiment. The content of the basic compound is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, and still more preferably 1.5% by mass or less based on the total amount of the composition for the deinking agent of the present embodiment.

[0020] If the content of the basic compound is at least the above-preferred lower limit value, the deinking property is further improved. If the content of basic compounds is below the preferred upper limit mentioned above, the impact on the printed fabric can be further reduced. In addition, the chemical risk of the deinking composition can be reduced, making it easier to implement recycling systems.

[0021] For example, the content of the basic compound is preferably 0.01% by mass or more and 5.0% by mass or less, more preferably 0.1% by mass or more and 3.0% by mass or less, and even more preferably 0.5% by mass or more and 1.5% by mass or less, based on the total amount of the deinking agent composition of this embodiment.

[0022] <Surfactants> The surfactant may be any of the following: anionic surfactant, nonionic surfactant, cationic surfactant, or amphoteric surfactant.

[0023] The HLB value of the surfactant is preferably 1 to 18, more preferably 3 to 17, even more preferably 5 to 17, and particularly preferably 6 to 17.

[0024] When the HLB value of the surfactant is within the preferred range mentioned above, the deinking properties are further improved.

[0025] In this specification, "HLB (Hydrophile-Lipophile Balance)" is a value proposed by Griffin that indicates the balance between hydrophilic and lipophilic groups in a surfactant molecule. This HLB value can be experimentally determined by comparing the emulsifying power of various surfactants, but it can typically be determined from the following Equation 1. Equation 1: HLB value = 20 × weight % of hydrophilic portion of surfactant / molecular weight of surfactant

[0026] Among the surfactants mentioned above, nonionic surfactants are preferred.

[0027] Nonionic surfactants Preferred nonionic surfactants include polyoxyalkylene alkyl ethers, polyoxyethylene styrylated phenyl ethers, and polyoxyalkylated rivenzyl phenyl ethers. Preferred polyoxyalkylene alkyl ethers include polyoxyethylene polyoxypropylene lauryl ether, polyoxyethylene polyoxypropylene tridecyl ether, polyoxyethylene polyoxypropylene branched decyl ether, and polyoxyethylene lauryl ether. As the polyoxyalkylated tripenzylphenyl ether, polyoxyethylene tripenzylphenyl ether is preferred.

[0028] The HLB value of the polyoxyalkylene alkyl ether is preferably 1 to 15, more preferably 3 to 14.5, even more preferably 5 to 14, and particularly preferably 6 to 10.

[0029] The HLB value of polyoxyethylene styrylated phenyl ether is preferably 1 to 18, more preferably 10 to 17, even more preferably 12 to 17, and particularly preferably 13 to 16.

[0030] Among the nonionic surfactants listed above, polyoxyethylene styrylated phenyl ether is preferred.

[0031] Surfactants may be used individually or in combination of two or more types. The surfactant content is preferably 0.01% by mass or more, more preferably 0.05% by mass or more, and even more preferably 0.1% by mass or more, based on the total amount of the deinking agent composition of this embodiment. The surfactant content is preferably 5.0% by mass or less, more preferably 3.0% by mass or less, and even more preferably 1.0% by mass or less, based on the total amount of the deinking agent composition of this embodiment.

[0032] If the surfactant content is above the preferred lower limit mentioned above, the deinking properties will be further improved. If the surfactant content is below the above-mentioned preferred upper limit, foaming will be less likely to occur, making it easier to rinse with water.

[0033] For example, the surfactant content is preferably 0.01% by mass or more and 5.0% by mass or less, more preferably 0.05% by mass or more and 3.0% by mass or less, and even more preferably 0.1% by mass or more and 1.0% by mass or less, based on the total amount of the deinking agent composition of this embodiment.

[0034] The deinking agent composition of this embodiment may contain optional components other than the basic compounds and surfactants described above. Examples of such optional components include water, reducing agents, chelating agents, and flocculants.

[0035] ≪Water≫ Examples of water include deionized water, tap water, and distilled water. Water may be used alone or in combination of two or more types.

[0036] The water content is preferably 90 to 99.98% by mass, more preferably 93 to 99% by mass, and even more preferably 95 to 99% by mass, based on the total amount of the deinking agent composition of this embodiment.

[0037] Reducing agent Examples of reducing agents include hydrosulfite, thiourea dioxide, zinc sulfoxylate formaldehyde, and sodium sulfoxylate formaldehyde.

[0038] Chelating agents Examples of chelating agents include ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), diethylenetriaminepentaacetic acid (DTPA), gluconic acid, and hydroxyethylidenediphosphonic acid.

[0039] (Deinking agent) The deinking agent of this embodiment may include a deinking agent composition, or it may be the deinking agent composition itself.

[0040] (Method for producing deinked printed fabric) The method for manufacturing deinked printed fabric in this embodiment is a method for manufacturing deinked printed fabric using the deinking agent described above. The method for producing a deinked printed cloth according to this embodiment includes a deinking step of obtaining a deinked printed cloth by applying an external force to the printed cloth in the presence of the above-mentioned deinking agent to deink it. The ink and / or the printed fabric swell when the aforementioned deinking agent is used. Furthermore, by applying external forces to the printed fabric, such as beating, dropping, rubbing, twisting, rubbing, pulling, impacting, or applying pressure (e.g., water pressure), the ink can be removed more effectively from the printed fabric, resulting in improved deinking performance.

[0041] [Deinking process] The deinking process involves applying external force to the printed fabric in the presence of the aforementioned deinking agent to remove the ink, thereby obtaining a deinked printed fabric.

[0042] The amount of deinking agent used is preferably 50 to 400 parts by mass, more preferably 75 to 300 parts by mass, per 1 part by mass of the printed fabric.

[0043] The processing temperature in the deinking process is preferably 45 to 100°C, more preferably 50 to 95°C, even more preferably 60 to 95°C, and particularly preferably 70 to 90°C.

[0044] The processing time in the deinking process is preferably 1 to 60 minutes, and more preferably 10 to 45 minutes.

[0045] The deinking process is preferably performed using rotational processing. Specifically, rotational processing at 10 to 1000 revolutions per minute is preferred, rotational processing at 10 to 600 revolutions per minute is more preferred, and rotational processing at 10 to 100 revolutions per minute is even more preferred.

[0046] The deinking process is preferably carried out using a stirrer. Examples of such agitators include rounder meters, stirrers, industrial washing machines, and decolorization / bleaching equipment. Among these, rounder meters and stirrers are preferred.

[0047] A rounder meter is a device in which a container containing stainless steel balls rotates, and these stainless steel balls agitate the liquid. A stirrer is a device that uses the force of magnets to rotate a magnetic rod called a rotor (or stirring bar) inside a container, thereby stirring a liquid.

[0048] When using a rounder meter in the deinking process, the diameter of the stainless steel ball is preferably 2 to 10 mm, more preferably 4 to 8 mm, and even more preferably 6 to 8 mm.

[0049] When using a rounder meter in the deinking process, the number of stainless steel balls is preferably 5 to 45, and more preferably 10 to 30.

[0050] When using a stirrer in the deinking process, the rotor is preferably tapered. Preferred tapered shapes are 10mm-Φ4, 20mm-Φ7, 25mm-Φ8, or 30mm-Φ8.

[0051] The deinking process is preferably a process in which the deinking agent, the contact body, and the printed fabric are mixed together, and an external force is applied by bringing the contact body into contact with the printed fabric. More specifically, it is preferable to use a rounder meter to mix the above-mentioned deinking agent, stainless steel balls, and the printed fabric in the container of the rounder meter, and to obtain a deinked printed fabric by applying external force by bringing the stainless steel balls into contact with the printed fabric.

[0052] Printed fabric is fabric that has been printed with ink. Examples of such inks include inks containing pigments. More specifically, examples of inks include inks containing pigment dispersions, binder resins, wetting agents, organic solvents, pH adjusters, viscosity adjusters, water, and crosslinking agents. Furthermore, the ink may contain a flame retardant. Examples of flame retardants include halogen-based flame retardants, phosphorus-based flame retardants, metal hydroxide-based flame retardants, and antimony-based flame retardants.

[0053] Materials for printed fabrics include polyester, acrylic, polyethylene, polypropylene, nylon, cotton, vinylal, vinylon, ethylene vinyl alcohol fiber, polyvinyl chloride, vinylidene, acrylic, modacryl, acrylate, aramid, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyarylate fiber, polylactic acid, polyurethane, fluorine fiber, polyimide, polyether ester elastomer, polyphenylene sulfide, alginate, elastodiene, elastoolefin, melamine fiber, polycarbonamide, trivinyl, polybenzimidazole, chitin fiber, carbon fiber, glass fiber, metal fiber, ceramic fiber, rayon, polynosic, modal, lyocell, cupro, acetate, triacetate, promix, protein fiber, and blends thereof.

[0054] Applications of printed fabrics include advertising banners and flags, clothing, sportswear, fashion items, bedding, household goods such as interior furnishings, car seats, and nonwoven fabrics.

[0055] The method for manufacturing the deinked printed fabric of this embodiment may include optional steps other than the [deinking step] described above. Such optional steps include a washing step for washing the deinked printed fabric obtained in the [deinking step].

[0056] [Washing process] The washing process involves washing the deinked printed fabric obtained in the deinking process described above. Specifically, the washing process includes a water washing step in which the deinked printed fabric obtained in the deinking process described above is washed with water. The rinsing process may be carried out while applying external force, from the standpoint of cleaning effectiveness. Examples of external forces include those similar to those exemplified in the deinking process. The amount of water used depends on the applied external force, but is preferably 5,000 to 50,000 parts by mass, and more preferably 10,000 to 30,000 parts by mass, per 1 part by mass of the printed cloth. [Examples]

[0057] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[0058] [Preparation of test dyeing paste] A test printing paste was prepared by mixing the components shown in Table 1.

[0059] [Table 1]

[0060] [Preparation of test printable fabric] Polyester pongee (T. Pongee HR White, manufactured by Seihō Chemical Industry Co., Ltd.) was stretched onto a bracket (made of chloroprene rubber, hardness 60, thickness 5 mm), and then printed using a 135-mesh flat screen (2 cm x 4 cm rectangular pattern, 135 mesh, polyester screen, manufactured by Sanko Co., Ltd.) with a squeegee (made of chloroprene rubber, hardness 70, accessory for MH-5 type) using test printing paste. Then, this was dried at 100°C for 1 minute using a dryer (MH-5 model, manufactured by Tsujii Dyeing Machinery Co., Ltd.), and then heat-treated at 150°C for 2 minutes using the same dryer (MH-5 model, manufactured by Tsujii Dyeing Machinery Co., Ltd.) to obtain a printed fabric. The obtained printed fabric was cut into a 3cm x 5cm rectangle so that a 2cm x 4cm rectangular pattern was in the center, thereby obtaining a test printed fabric with both white and printed areas. In the test printable fabric, the printed side is considered the surface.

[0061] [Manufacturing of deinking agents (compositions for deinking agents)] Deinking agents (deinking agent compositions) were prepared by mixing the basic compounds, surfactants, and water shown in Tables 2 and 3. The materials are as follows: • Sodium hydroxide (special grade sodium hydroxide, manufactured by Kishida Chemical Co., Ltd.) • Potassium hydroxide (special grade potassium hydroxide, manufactured by Kishida Chemical Co., Ltd.) • Polyoxyethylene polyoxypropylene lauryl ether (DKS NL-DASH 404, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=8) • Polyoxyethylene polyoxypropylene lauryl ether (DKS NL-DASH 403, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=6.5) • Polyoxyethylene polyoxypropylene lauryl ether (DKS NL-DASH 408, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=12) • Polyoxyethylene polyoxypropylene tridecyl ether (Neugen TDX-50, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=9.0) • Polyoxyethylene polyoxypropylene tridecyl ether (Neugen TDX-80D, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=13.1) • Polyoxyethylene lauryl ether (DKS NL-40, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=9.5) • Polyoxyethylene polyoxypropylene branched decyl ether (Neugen XL-41, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=10.5) • Polyoxyethylene styrylated phenyl ether (Neugen EA-87, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=10.6) • Polyoxyethylene styrylated phenyl ether (Neugen EA-137, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=13.0) • Polyoxyethylene styrylated phenyl ether (Neugen EA-177, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., HLB=15.6) • Polyoxyethylene tripenzylphenyl ether (Emulgen B-66, manufactured by Kao Corporation, HLB=13.2)

[0062] [Table 2]

[0063] [Table 3]

[0064] [Evaluation of deinking properties] Deinking and washing processes were carried out under the conditions shown in Tables 4 and 5 to produce deinked printed fabrics. Five test printable fabrics were used. For the examples other than Example 7 and the comparative examples, the washing process was carried out by spraying 10,000 mL of tap water in a shower-like manner onto five test printable cloths after the deinking process. In Example 7, after the deinking process, 10,000 mL of tap water was poured over five test printable cloths, rubbing the cloths together while washing. The "amount of deinking agent used" in Tables 4 and 5 is the amount per 1 part by mass of the test printable cloth.

[0065] The equipment used in the test is as follows: • Rounder meter (L-16Z-T, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) Capacity of the provided cup: 550mL

[0066] • Stirrer (SYNCHRO-M-STIRRER SYM-6, manufactured by ADVANTEC) A glass bottle (70 mL, M-70, manufactured by Kashiwayo Glass Co., Ltd.) was filled with a stirrer tip (tapered type, 25 mm-Φ8 (length: 25 mm, diameter of the central cross-section circle: 8 mm), manufactured by AZONE), a deinking agent, and a test printable cloth, and stirred under the conditions shown in the table.

[0067] The operating condition [revolutions / minute] refers to the rotation speed of the container when using a rounder meter, and to the rotation speed of the stirrer tip when using a stirrer.

[0068] <<Presence or absence of coloring in the deinking agent>> If the answer is "Yes," it means that the test printing paste has dissolved into the deinking agent or has peeled off and dispersed.

[0069] ≪Deinking property≫ The evaluation criteria for deinking properties are as follows, and the evaluation was performed on both the front and back surfaces of the test printed cloth. The evaluation criteria will conform to "JIS L 0804 2004, Grace Scale for Discoloration and Fading". The evaluation is on a 9-point scale, and a lower value indicates better deinking and superior deinking performance.

[0070] ≪White area contamination≫ The evaluation criteria for contamination of white areas are as follows: The evaluation criteria will conform to "JIS L 0805 2005, Grayscale for Contamination". The evaluation is on a 9-point scale, with higher values ​​indicating less white field contamination and therefore less white field contamination.

[0071] [Table 4]

[0072] [Table 5]

[0073] As shown in Tables 4 and 5, the deinking agents used in Examples 1 to 21, which consisted of a deinking agent composition (deinking agent) containing a basic compound and a surfactant, exhibited better deinking properties compared to the deinking agents used in Comparative Examples 1 and 2.

Claims

1. A deinking agent composition comprising a basic compound and a surfactant.

2. The deinking agent composition according to claim 1, wherein the basic compound comprises one or more compounds selected from the group consisting of basic inorganic compounds and basic organic compounds.

3. The deinking agent composition according to claim 1, wherein the HLB value of the surfactant is 1 to 15.

4. The deinking agent composition according to claim 1, wherein the pH of the deinking agent composition is greater than 7 and less than or equal to 14.

5. A deinking agent composition according to claim 1, used for deinking printed fabrics that have been printed with pigments.

6. A deinking agent comprising the deinking agent composition according to any one of claims 1 to 5.

7. A method for producing a deinked printed fabric, comprising a deinking step of deinking the printed fabric by applying an external force to the printed fabric in the presence of the deinking agent described in claim 6 to obtain a deinked printed fabric.

8. The method for producing a deinked printed cloth according to claim 7, wherein the processing temperature in the deinking step is 45 to 100°C.

9. The method for producing a deinked printed cloth according to claim 7, wherein the processing time in the deinking step is 1 to 60 minutes.

10. A method for producing a deinked printed fabric according to claim 7, wherein in the deinking step, the deinking agent according to claim 6, the contact body, and the printed fabric are mixed together, and an external force is applied by bringing the contact body into contact with the printed fabric.

11. The method for producing a deinked printed fabric according to claim 7, further comprising a washing step of washing the deinked printed fabric obtained in the deinking step.

Images