Separation and recovery apparatus and recovery method for laminates

Abstract

To provide a peeling apparatus that reduces the rate of peeling defects. [Solution] A processing apparatus comprising a processing tank (A) equipped with a stirring means, an input means (B) for supplying the material to be processed, which is a shredded laminate, into the processing tank (A), and a release agent supply means (C) for supplying a liquid release agent into the processing tank (A), wherein a release agent heating means (D) is provided before the release agent supply means (C), and the release agent supply means (C) has a release agent input pipe (C-1) for processing the laminate.

Description

Technical Field

[0001] The present invention relates to an apparatus for separating and recovering a laminate and a recovery method.

Background Art

[0002] In order to satisfy the performance required for packaging materials and the like, many laminates combining different materials have been put on the market. However, materials formed by laminating films with different properties are difficult to be material-recycled for purposes such as global environmental protection.

[0003] Furthermore, printing is often applied to packaging materials. In such cases, during material recycling, printing ink components tend to easily mix into the reused resin. Even a small amount of such printing ink components can cause coloration, which limits the applications of the recycled resin. Therefore, it is important to separate the components constituting the printing layer from the reused resin.

[0004] In order to solve such problems, treatments for immersing a laminate in a treatment agent solution to dissolve and disperse specific layers such as the adhesive layer and printing layer, separate the remaining constituent resin, and obtain a resin base material have been studied (for example, Patent Documents 1, 2, and 3).

[0005] In addition, processing apparatuses for performing such treatment have also been proposed in Patent Documents 4 and 5.

Prior Art Literature

Patent Literature

[0006]

Patent Literature 1

Patent Literature 2

Patent Literature 3

Patent Literature 4

[0007] The present invention aims to provide a peeling apparatus that reduces the rate of peeling defects. [Means for solving the problem]

[0008] The present invention A processing tank (A) equipped with a stirring means, An input means (B) for supplying the material to be processed, which is the shredded material obtained by cutting the laminate, into the processing tank (A), and The apparatus is equipped with a stripping agent supply means (C) for supplying a liquid stripping agent into a treatment tank (A), Prior to the release agent supply means (C), there is a release agent heating means (D), The laminate stripping apparatus is characterized in that the stripping agent supply means (C) has a stripping agent input pipe (C-1).

[0009] Preferably, the above-mentioned stripping agent supply means (C) further includes a treatment tank internal cleaning shower (C-2). Preferably, the peeling apparatus of the present invention further includes a separation mechanism (E) for the peeling agent and the treated resin downstream of the treatment tank (A).

[0010] The present invention relates to a method for peeling a laminate using the peeling apparatus described above, Step (I): Adding the material to be treated and the liquid stripping agent to the treatment tank (A) The process is followed by step (I), and includes step (II) of performing a peeling treatment while stirring. In process (I), the stripping agent is introduced through the stripping agent introduction pipe (C-1). In step (II), the treatment is performed while washing away the workpiece adhering to the inner wall of the treatment tank (A) with the treatment tank internal cleaning shower (C-2) The present invention is also a peeling treatment method for a laminate, characterized by the above feature.

[0011] The present invention is a peeling treatment method for a laminate using the above-mentioned peeling treatment apparatus, wherein Step (I) of charging the workpiece and a liquid release agent into a treatment tank (A) Following step (I), step (II) of performing peeling treatment while stirring, and Following step (II), step (III) of performing solid-liquid separation at 60 to 90°C comprising The present invention is also a peeling treatment method for a laminate, characterized by the above feature.

Effects of the Invention

[0012] The peeling treatment apparatus and peeling treatment method of the present invention enable efficient separation of each layer constituting a laminate when recycling the resin constituting the laminate.

Brief Description of Drawings

[0013] [Figure 1] It is a schematic diagram showing an example of the present invention. [Figure 2] It is a schematic diagram showing an example of the present invention. [Figure 3] It is a diagram showing the results of Example 1. [Figure 4] It is a diagram showing the results of Example 2.

Mode for Carrying Out the Invention

[0014] Hereinafter, the present invention is described in detail. The present invention is characterized by comprising a release agent charging pipe (C-1) as a release agent supply means (C). The stripping apparatus of the present invention performs processing in the presence of a heated stripping agent in a tank. By supplying the heated stripping agent into the tank through the stripping agent input pipe (C-1), the operator does not directly come into contact with the stripping agent, thus ensuring safe supply of the stripping agent. Furthermore, by heating the stripping agent before input, processing can be performed under conditions that are advantageous in terms of thermal efficiency. Also, when heating before input, it is preferable to input the stripping agent through the stripping agent input pipe (C-1) from the standpoint of operator safety.

[0015] In a more preferred embodiment, the stripping apparatus of the present invention is equipped with a cleaning shower (C-2) inside the processing tank (Figure 1). When attempting to process the shredded material obtained from the laminate in a liquid, the shredded material may adhere to the inner wall of the processing tank (A), which can make the peeling process inefficient. Therefore, the processing is carried out while washing away the fluff adhering to the inner wall using the internal cleaning shower (C-2) of the processing tank. This helps to maintain the efficiency of the processing. Furthermore, after the completion of process (II), when discharging the processed shredded material, the crushed material adhering to the inside of the processing tank is washed away, allowing for the efficient recovery of the processed shredded material.

[0016] The following describes in detail each component of the present invention with reference to Figure 1. (Processing tank (A)) The treatment tank (A) is preferably a treatment tank used in the chemical field or the like. More preferably, it is a jacketed tank or has a heating and heat retention mechanism such as a heat exchanger.

[0017] The stripping treatment using the stripping apparatus of the present invention is performed while stirring a mixture of the treatment liquid and the material to be treated. Therefore, it is equipped with a stirring means suitable for this purpose. The stirring means are not particularly limited, but in order to more uniformly disperse the crushed laminate material in the release agent, it is preferable that the shape provides an up-and-down circulating motion. Specifically, examples include edged turbine blades, anchor blades, and paddle blades.

[0018] (Input means (B)) The input means (B) is for supplying the material to be processed, which is the shredded material obtained by cutting the laminate, into the processing tank (A), and is not particularly limited as long as it can achieve this purpose. Specifically, examples include an auto feeder, belt conveyor, chain conveyor, screw conveyor, vibrating conveyor, etc.

[0019] The above-mentioned auto-feeder automatically adds the crushed laminate material to the processing tank, and it is preferable that it does not require opening the lid of the processing tank during introduction. The crushed material peeling treatment apparatus of the present invention performs the treatment by heating in the processing tank. Therefore, in order to perform the treatment with thermal efficiency, it is preferable to avoid a drop in temperature due to opening the lid during the processing step. In addition, the steam from the heated peeling agent does not leak to the outside, which reduces the environmental burden. For this reason, it is preferable to use an auto-feeder.

[0020] (Removal agent supply means (C)) In the present invention, the stripping agent supply means (C) has a stripping agent input pipe (C-1). More preferably, it also includes a treatment tank internal cleaning shower (C-2). The stripping agent input pipe (C-1) is for initially supplying a certain amount of stripping agent to the treatment tank (A). The treatment tank internal cleaning shower (C-2) is for washing away the pulverized material that adheres to the inner wall surface of the treatment tank (A) during treatment. By providing such a treatment tank internal cleaning shower (C-2), the problem of poor stripping due to pulverized material adhering to the treatment tank not reacting can be improved.

[0021] (Pipe for dispersant application (C-1)) The stripping agent supply pipe (C-1) is a cylindrical stripping agent supply port, which allows the treatment agent to be supplied into the tank.

[0022] (Interior cleaning shower for the treatment tank (C-2)) The above-mentioned internal cleaning shower (C-2) for the treatment tank is preferable for the purpose of improving treatment efficiency by preventing the crushed material described above from adhering to the inner wall surface of the treatment tank (A). Furthermore, it is preferable in that it prevents contamination of the treatment tank (A) by printing ink. The laminates treated by the present invention often have a printed layer. When such a laminate with a printed layer is treated, the ink components in the printed layer become compatible with and disperse in the treatment solution. However, since such ink components do not have a high affinity for solvents, they tend to adhere to the reaction tank.

[0023] If ink components adhere to the reaction tank in this way, the accumulation of ink components will cause contamination of the treatment tank (A), necessitating an increased frequency of cleaning of the treatment tank (A) to prevent ink contamination of the treated material. Furthermore, since the treatment tank (A) is used under heated conditions, the ink may react and adhere to the surface of the treatment tank, making it difficult to remove even with cleaning.

[0024] Furthermore, as ink components accumulate due to such contamination, they may precipitate in the treatment tank. These precipitated ink components can also cause contamination of the extraction valve installed in the treatment tank.

[0025] The above-mentioned internal cleaning shower (C-2) of the treatment tank is not particularly limited as long as it can wash the inner wall of the treatment tank (A) with a shower of stripping agent, and any known type such as a two-dimensional nozzle, a three-dimensional nozzle, a shower ball, a push-out nozzle, or a sanitary nozzle can be used. One of the above-mentioned internal cleaning showers (C-2) of the treatment tank is sufficient to achieve the purpose, but it is also acceptable to have two or more internal cleaning showers (C-2). For example, internal cleaning showers (C-2) of the treatment tank can be provided at the top, middle, and bottom of the treatment tank.

[0026] Furthermore, in this invention, a treatment tank internal cleaning shower (C-2) is also one in which holes are provided in the inner wall surface of the treatment tank (A) and the stripping agent is supplied through these holes. By supplying the stripping agent in this manner, the inner wall surface can also be washed with the stripping agent.

[0027] (Heating means (D)) The stripping apparatus of the present invention is equipped with a heating means (D) in front of the stripping agent supply means (C). As described above, the processing performed by the stripping apparatus of the present invention is carried out under heating conditions. In order to carry out such processing while maintaining thermal efficiency, it is preferable to minimize temperature changes in the processing tank (A). Therefore, it is preferable to supply a stripping agent that has been heated in advance. From this viewpoint, the heating means (D) is provided in front of the stripping agent supply means (C).

[0028] Furthermore, in this invention, the stripping agent is supplied by a stripping agent input pipe (C-1) and an internal cleaning shower (C-2) for the treatment tank. By supplying the agent in this manner, it is possible to prevent workers from being exposed to danger by handling heated treatment agents without direct contact with the stripping agent.

[0029] The heating means (D) described above can be configured to supply the stripping agent from the stripping agent tank to the treatment tank (A), and after passing through the heating means, branch off into a pipe supplying to the treatment tank internal cleaning shower (C-2) and a stripping agent input pipe (C-1). This is because it is preferable that both the pipe supplying to the treatment tank internal cleaning shower (C-2) and the stripping agent input pipe (C-1) are means for supplying the stripping agent in a heated state. Such an embodiment is shown in Figure 1.

[0030] Another possible configuration involves equipping the release agent tank with a heating function. By maintaining the release agent itself at a predetermined temperature, it becomes possible to continuously supply release agent at that temperature. This configuration is shown in Figure 2.

[0031] (Separation mechanism between release agent and treated resin (E)) The processing apparatus of the present invention preferably includes a separation mechanism (E) for the release agent and the treated resin downstream of the processing tank (A). Since the processing apparatus of the present invention is for recovering resin after processing, it is preferable to perform solid-liquid separation after processing in the processing tank (A) as described above. For this reason, it is preferable to provide a separation mechanism (E) for separating the release agent and the processed resin for solid-liquid separation. The separation mechanism (E) for the release agent and the processed resin is not particularly limited and can include an extrusion type centrifuge, a continuous centrifuge, a filtration system, etc.

[0032] In the apparatus of the present invention, there is no need to provide a cooling means between the processing tank (A) and the separation mechanism (E). That is, although the processing in the processing tank (A) is carried out under heating conditions, it may be directly guided to the separation mechanism (E) without cooling thereafter. As will be described in detail below, in the present invention, it is preferable to carry out the separation process under heating conditions, so means for adjusting the processing temperature in the separation process are not essential.

[0033] Furthermore, a temperature control means (F) may be provided between the processing tank (A) and the separation mechanism (E). In other words, as described above, the temperature control means (F) is not essential for achieving the objectives of the present invention, but if necessary, the temperature control means (F) may be provided to adjust the temperature at which solid-liquid separation is performed.

[0034] The apparatus of the present invention may also include a resin washing tank for further washing the solid separated by the separation mechanism (E) described above. It is preferable to wash away any release agent adhering to the surface of the separated resin, as well as any removed resin or ink. Providing a resin washing tank to achieve this objective is preferable because it allows for the production of recycled resin with fewer impurities. The apparatus may also include a drying means after such washing treatment.

[0035] (Other constituent units) The peeling apparatus of the present invention may be equipped with other components as needed. For example, a liquid pump for supplying liquid, and necessary processing means to be used between the time the liquid that has finished processing in the processing tank (A) is supplied to the next separation mechanism (e.g., a heat exchanger for cooling) may be used.

[0036] (Processing method) The following describes in detail a processing method using the apparatus of the present invention. The material to be processed by the processing apparatus in the present invention is a shredded material obtained by cutting a laminate. In particular, it is preferable that the laminate has an adhesive layer.

[0037] More specifically, the materials to be processed are not limited to any particular type, but include, for example, packaging materials such as packaging films and sheets, packaging containers, fuel tanks for gasoline, refrigerant transport hoses, optical materials, and other commonly used items. Their shapes are also not limited to any particular type, and can include hollow bodies, films, etc.

[0038] The method of shredding the material to be processed is not particularly limited and can be any known method. The size of the shredded material is not particularly limited, but can be, for example, 1 to 20 mm.

[0039] Step (I) of the processing method of the present invention is the step of introducing the material to be processed and a liquid stripping agent into the processing tank (A). This is mainly done by the introduction means (B) and the stripping agent introduction piping (C-1), but there is no problem in operating the processing tank internal cleaning shower (C-2) during the introduction step.

[0040] The material to be treated and the stripping agent may be added simultaneously, or they may be added sequentially. There are no particular restrictions on the order in which they are added.

[0041] The processing liquid used in the process according to the present invention is not particularly limited, and for example, the processing liquid described in Japanese Patent No. 7320890 can be used. The process in step (II) below is preferably carried out at 60 to 90°C. For this reason, the stripping agent supply means (C) may be a stripping agent storage tank equipped with a heating mechanism, or a heat exchanger may be provided in the middle of the supply line, and the stripping agent may be introduced into the processing tank (A) after heating.

[0042] In step (II), which will be described in detail below, it is preferable that the stripping agent supplied is also supplied at the processing temperature of 60-90°C. For this reason, if a heat exchanger is installed in the middle of the supply line as described above, it is preferable to separate the piping after the heat exchanger and connect it to the treatment tank internal cleaning shower (C-2) and the stripping agent supply piping (C-1).

[0043] In step (I), the mixing ratio of the release agent to the workpiece is not particularly limited, but can be in the range of 20:1 to 10:1, for example.

[0044] As described above, in step (II), it is preferable to perform the treatment at 60 to 90°C. This allows for good delamination. In this treatment, it is preferable to dissolve, for example, a polyurethane adhesive, printing ink, or EVOH layer in the treatment solution. This separates each layer that makes up the laminate.

[0045] During the processing in step (II), it is preferable to introduce 1 to 8% by mass of the stripping solution relative to 100% by mass of the total mass of the stripping agent supplied by the internal cleaning shower (C-2) of the stripping solution treatment tank. By doing so, a suitable treatment can be performed. The processing time is not particularly limited and can be, for example, 0.5 to 15 hours.

[0046] The stripping agent can be supplied via the internal cleaning shower (C-2) in the treatment tank, regardless of whether the treatment is started or finished. Alternatively, it can be supplied continuously during the treatment. By supplying 1 to 8% of the total mass of the stripping agent, the treatment can be performed particularly efficiently.

[0047] After step (II) is completed, the crushed laminate material adhering to the inside of the processing tank can be washed away by the internal cleaning shower (C-2) at a rate of 5 to 10% by mass relative to the total mass of the release agent supplied, thereby enabling satisfactory recovery. Note that the release agent separated in step (II) can also be used.

[0048] The crushed material, after being subjected to this release treatment, is removed from the container and supplied to the next process. The next process is preferably a separation treatment of the release agent and the treated resin. In other words, it is a process for obtaining the required treated resin. Such a separation mechanism (E) is preferably a general solid-liquid separation method, and can be the separation mechanism (E) detailed in the apparatus of the present invention as described above. When processing by centrifugation, the temperature during centrifugation is preferably 60 to 90°C. For this reason, it is preferable to adjust the temperature to one suitable for centrifugation and perform the separation without cooling the processed solution to room temperature.

[0049] After separation, it is preferable to wash the material to remove any remaining release agent. The treated resins obtained in this way are preferably separated by known means according to their resin type and reused.

[0050] The processing method of the present invention may be batch processing or continuous processing. That is, after processing, all of the processing liquid in the tank may be drained and separation processing may be performed. Furthermore, the material to be processed and the stripping agent may be continuously added while simultaneously draining the liquid after processing and performing continuous separation processing.

[0051] (Removal agent) The stripping agent used in the above-described process is not particularly limited, and any known stripping agent can be used depending on the purpose. Known release agents include alkaline release agents containing polar solvents (i) and neutral release agents containing polar solvents (ii). These will be described in detail below.

[0052] <Removal agent (i)> The alkaline stripping agent (i) containing a polar solvent that can be used in step (II) is not particularly limited, but it is preferably one that contains a polar solvent, a quaternary ammonium salt, and water.

[0053] Examples of polar solvents include diethylene glycol monobutyl ether, isopropanol, N-methyl-2-pyrrolidone, dimethylformamide, dimethyl sulfoxide, and benzyl alcohol. These may be used individually or in combination of two or more.

[0054] The content of the polar solvent is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 65% ​​by mass or more, based on the total mass of the release agent (i). On the other hand, the content of the polar solvent is preferably 90% by mass or less, more preferably 80% by mass or less, and even more preferably 75% by mass or less, based on the total mass of the release agent (i).

[0055] Examples of quaternary ammonium salts include dimethylbis(2-hydroxyethyl)ammonium hydroxide, monomethyltris(2-hydroxyethyl)ammonium hydroxide, trimethyl-2-hydroxyethylammonium hydroxide, and tetraalkylammonium hydroxides (such as tetramethylammonium hydroxide) whose pH in a 1% aqueous solution is 11.5 or higher.

[0056] The content of the above-mentioned quaternary ammonium salt is preferably 1% by mass or more, more preferably 3% by mass or more, and even more preferably 5% by mass or more, based on the total mass of the release agent (i). On the other hand, the upper limit of the content is preferably 20% by mass or less, more preferably 18% by mass or less, and even more preferably 15% by mass or less, based on the total mass of the release agent (i).

[0057] <Removal agent (ii)> The neutral stripping agent (ii) containing a polar solvent that can be used in step (II) preferably contains a polar solvent, a fatty acid salt, an amphiphilic glycol-based and / or glycol ether-based solvent, a paraffinic hydrocarbon, a nonionic surfactant, and water, and has a pH of 6.0 to 8.0.

[0058] Examples of polar solvents include isopropanol, N-methyl-2-pyrrolidone, dimethylformamide, dimethyl sulfoxide, benzyl alcohol, phenoxyethanol, and phenethyl alcohol. These may be used individually or in combination of two or more.

[0059] The content of the above polar solvent is preferably 10 to 80% by mass relative to the total mass of the release agent (ii). The lower limit of the content is more preferably 20% by mass, and even more preferably 30% by mass. On the other hand, the upper limit of the content is more preferably 70% by mass, and even more preferably 60% by mass.

[0060] Examples of the above-mentioned amphiphilic glycol-based and / or glycol ether-based solvents include, specifically, propylene glycol, diethylene glycol, ethylene glycol, polyethylene glycol, polypropylene glycol, 3-methoxy-3-methylbutanol, propylene glycol monomethyl ether, and dipropylene glycol monomethyl ether. These may be used individually or in combination of two or more. Among these, propylene glycol, diethylene glycol, polyethylene glycol, propylene glycol monomethyl ether, and dipropylene glycol monomethyl ether are preferred.

[0061] The content of the above-mentioned amphiphilic glycol-based and / or glycol ether-based solvent is preferably 1 to 50% by mass relative to the total mass of the stripping agent (ii). The lower limit of the content is more preferably 3% by mass. On the other hand, the upper limit of the content is more preferably 40% by mass, and even more preferably 30% by mass.

[0062] The fatty acid salts mentioned above specifically include, for example, sodium oleate, sodium stearate, sodium laurate, sodium myristate, sodium palmitate, sodium linoleate, sodium linolenate, potassium laurate, potassium myristate, potassium palmitate, potassium linoleate, potassium linolenate, potassium oleate, and potassium stearate. These may be used individually or in combination of two or more. Among these, sodium laurate, potassium laurate, sodium oleate, potassium oleate, sodium stearate, and potassium stearate are preferred.

[0063] The content of the above fatty acid salt is preferably 1 to 40% by mass relative to the total mass of the release agent (ii). The lower limit of the content is more preferably 5% by mass. On the other hand, the upper limit of the content is more preferably 30% by mass, and even more preferably 20% by mass.

[0064] The above paraffinic hydrocarbons have the general formula C n H 2n+2 It is preferable that the hydrocarbon is represented by (n is an integer greater than or equal to 15). Specifically, examples include liquid paraffin. By using paraffinic hydrocarbons, which are oily liquids such as the liquid paraffin mentioned above, a homogeneous state can be maintained when mixed as a solution. The above liquid paraffin has a kinematic viscosity of 130 mmHg. 2 It is preferable that the value be less than or equal to / s. The kinematic viscosity mentioned above was measured at 40°C using a glass capillary viscometer, in accordance with JIS K2231-1993 and JIS K2283.

[0065] The paraffinic hydrocarbon content is preferably 1 to 30% by mass relative to the total mass of the release agent (ii). The lower limit of the content is more preferably 1% by mass. On the other hand, the upper limit of the content is more preferably 20% by mass, and even more preferably 10% by mass.

[0066] The above nonionic surfactant preferably has an HLB of 5.0 to 16.0. In this invention, HLB is a value defined by the following formula, calculated using the Griffin method. HLB value = 20 × [sum of chemical formula weights of hydrophilic parts] / molecular weight

[0067] The nonionic surfactants mentioned above specifically include, for example, coconut oil fatty acid monoethanolamide, coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, lauric acid diethanolamide, lauric acid myristic acid monoethanolamide, lauric acid myristic acid diethanolamide, myristic acid monoethanolamide, myristic acid diethanolamide, palm kernel oil fatty acid monoethanolamide, palm kernel oil fatty acid diethanolamide, stearic acid monoethanolamide, stearic acid diethanolamide, isostearic acid monoethanolamide, isostearic acid diethanolamide, oleic acid monoethanolamide, oleic acid diethanolamide, and polyoxyethylene (EO2-5 mol) coconut oil fatty acid monoethanolamide. These may be used individually or in combination of two or more. Among these, coconut oil fatty acid monoethanolamide (HLB 10.1), coconut oil fatty acid diethanolamide (HLB 15.5), lauric acid monoethanolamide (HLB 10.7), lauric acid diethanolamide (HLB 12.5), stearic acid monoethanolamide (HLB 7.5), stearic acid diethanolamide (HLB 9.1), oleic acid monoethanolamide (HLB 7.5), and oleic acid diethanolamide (HLB 9.1) are preferred.

[0068] The content of the above-mentioned nonionic surfactant is preferably 5 to 30% by mass relative to the total mass of the stripping agent (ii).

[0069] The water content is preferably 10% by mass or more. More preferably 15% by mass or more. On the other hand, the upper limit is preferably 40% by mass, and more preferably 30% by mass.

[0070] Other types of release agents that can be used include, but are not limited to, nonionic surfactants, anionic surfactants, organic alkalinizing compounds, inorganic alkalinizing compounds, organic acids, and inorganic acids.

[0071] Examples of nonionic surfactants include alkoxylate-type nonionic surfactants, such as polyoxyalkylene monoalkyl or alkenyl ethers, alkyl monoglyceryl ethers, alkyl (poly)glycosides (glycoside-type nonionic surfactants), sorbitan-based nonionic surfactants, aliphatic alkanolamides, fatty acid monoglycerides, sucrose fatty acid esters, amidates of alkanolamines such as monoethanolamine, diethanolamine, and methylmonoethanolamine with fatty acids such as lauric acid and myristic acid.

[0072] Examples of anionic surfactants include sulfate ester-type anionic surfactants, sulfonic acid-type anionic surfactants, and carboxylic acid-type anionic surfactants.

[0073] Examples of organic alkaline compounds include monoethanolamine, diethanolamine, triethanolamine, N-methylethanolamine, monoisopropanolamine, aminoethylethanolamine, aminoethoxyethanol, butoxypropylamine, methoxypropylamine, ethanolpropylamine, ethylethanolamine, n-hydroxyethylmorpholine, aminopropyldiethanolamine, dimethylaminoethoxyethanol, N-methyldiethanolamine, 3-amino-1-propanol, diisopropylamine, aminomethylpropanediol, aminoethylpropanediol, N,N-dimethylaminomethylpropanediol, isopropylamine, 2-amino-1-butanol, aminomethylpropanol, aminodimethylpropanol, N,N-dimethylaminomethylpropanol, diisopropanolamine, tris(hydroxymethyl)aminomethane, benzylamine, triethylenediamine, tetraethyl Examples include ethylenepentamine, triethylenetetraamine, ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylamine, trimethylamine, morpholine, pentamethyldiethylenetriamine, hexamethylenetetramine, 3,3-iminobis(N,N-dimethylpropylamine), dipropylamine, dimethylaminoethanol, ethyldiethanolamine, cyclohexylamine, dicyclohexylamine, dibenzylamine, N-methylbenzylamine, pyrrole, pyrrolidine, pyridine, pyrazine, piperidine, N-hydroxyethylpiperidine, oxazole, thiazole, imidazole, 2-ethylhexyloxypropylamine, tetramethylammonium hydroxide, tetraethylammonium hydroxide, ethyltrimethylammonium hydroxide, 2-hydroxyethyltrimethylammonium hydroxide, monomethylamine, diethylamine, monoisopyramine, and diisopyramine.

[0074] Examples of inorganic alkaline compounds include lithium hydroxide, sodium hydroxide, potassium hydroxide, sodium hydrogen phosphate, diammonium hydrogen phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate, ammonium dihydrogen phosphate, potassium dihydrogen phosphate, sodium dihydrogen phosphate, lithium silicate, sodium silicate, potassium silicate, lithium carbonate, sodium carbonate, potassium carbonate, lithium borate, sodium borate, potassium borate, ammonia, and the like.

[0075] Examples of organic acids include acetic acid, oxalic acid, glycolic acid, formic acid, tartaric acid, lactic acid, succinic acid, malic acid, citric acid, maleic acid, and malonic acid.

[0076] Examples of organic acids include sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, hydrochloric acid, sulfamic acid, hydrofluoric acid, carbonic acid, boric acid, hypophosphorous acid, and phosphorous acid. [Examples]

[0077] The present invention will be described in more detail below based on examples. The formulations of stripping agents A and B used in the following experiment are shown below.

[0078] (Removal agent A) It contains 70% by mass of N-methyl-2-pyrrolidone as a polar solvent, 5% by mass of dimethylbis(2-hydroxyethyl)ammonium hydroxide as a quaternary ammonium salt, and 25% by mass of water.

[0079] (Removal agent B) It contains 32% by mass of benzyl alcohol as a polar solvent, 10% by mass of propylene glycol as an amphiphilic glycol-based and / or glycol ether-based solvent, 18% by mass of sodium oleate as a fatty acid salt, 10% by mass of liquid paraffin as a paraffinic hydrocarbon, 10% by mass of coconut oil fatty acid diethanolamide as a nonionic surfactant, and 20% by mass of water.

[0080] [Example 1] A laminate consisting of polyamide / printed layer / adhesive layer / polyethylene was crushed using a pulverizer. Next, 276g of release agent A was heated to 80°C and added to a container, followed by 30g of the crushed material. After adding the crushed material, the mixture was stirred at 500 rpm, and the crushed material adhering to the container walls was washed away with 24g of release agent A. The mixture was then subjected to a 3-hour stripping treatment to dissolve, compatibilize, and disperse the adhesive layer, printed layer, and various resins, and the resin substrates (polyamide and polyethylene) detached from the laminate were recovered.

[0081] [Comparative Example 1] A laminate consisting of polyamide / printed layer / adhesive layer / polyethylene was crushed using a pulverizer to produce a pulverized material. Next, 300g of release agent A was heated to 80°C and added to a container, followed by 30g of the pulverized material. After adding the pulverized material, the mixture was stirred at 500 rpm and the pulverized material adhering to the container walls was not washed off with release agent A. The pulverization process was carried out for 3 hours to dissolve, compatibilize, and disperse the adhesive layer, printed layer, and various resins, and the resin substrates (polyamide and polyethylene) detached from the laminate were recovered.

[0082] [result] As shown in Figure 3, in the comparative example, there were many unpeeled fragments on the container wall, but in the example, almost all of the fragments were processed, and a transparent resin substrate was obtained. From this, it was found that cleaning the container wall reduces peeling defects.

[0083] Furthermore, experiments were conducted in which the processing temperature and processing time were varied. As a result, it was found that the immersion and stirring temperature and time were preferably 1 to 5 days, and more preferably 2 to 4 days, under conditions of 20°C to less than 60°C. Under conditions of 60°C or higher, it was found that 1 to 5 hours, and more preferably 2 to 4 hours, were preferred.

[0084] [Example 2] A laminate consisting of a printed layer and polyethylene was crushed using scissors. Next, 276g of release agent B was heated to 80°C and added to a container, followed by 30g of the crushed material. After adding the crushed material, the mixture was stirred at 500 rpm, and the crushed material adhering to the container walls was washed away with 24g of release agent B. The material was then subjected to a 1-hour release treatment to dissolve, compatibilize, and disperse the printed layer, and the resin substrate (polyethylene) detached from the laminate was recovered.

[0085] [Comparative Example 2] A laminate consisting of a printed layer and polyethylene was crushed using scissors. Next, 300g of release agent B was heated to 80°C and added to a container, followed by 30g of the crushed material. After adding the crushed material, the mixture was stirred at 500 rpm for 3 hours without washing off the crushed material adhering to the container walls with release agent B. This process dissolved, compatibilized, and dispersed the printed layer, and the resin substrate (polyethylene) detached from the laminate was recovered.

[0086] [result] As shown in Figure 4, in the comparative example, there were many unpeeled fragments on the container wall, but in the example, almost all of the fragments were processed, and a transparent resin substrate was obtained. From this, it was found that cleaning the container wall reduces peeling defects. Furthermore, it was found that the temperature and time for immersion and stirring are preferably 1 to 5 days, and more preferably 1 to 3 days, under conditions of 20°C to less than 60°C, and preferably 1 to 5 hours, and more preferably 1 to 3 hours, under conditions of 60°C or higher.

[0087] [Example 3] A laminate consisting of polyamide / printed layer / adhesive layer / polyethylene was crushed using a pulverizer to produce a pulverized material. The pulverized material was then immersed in release agent A at atmospheric pressure and 80°C for 3 hours and stirred to dissolve, compatibilize, and disperse the adhesive layer, printed layer, and various resins, and the resin substrate detached from the laminate was recovered. Subsequently, the material was deliquidated using a centrifuge (Matsumoto Machinery LCA2000) at atmospheric pressure and 80°C with a centrifugal force of 500G for 40 seconds, and the wetness of the resin substrate was observed by touch.

[0088] [Example 4] A laminate consisting of polyamide / printed layer / adhesive layer / polyethylene was crushed using a pulverizer to produce a pulverized material. Next, the pulverized material was immersed and stirred in release agent A at atmospheric pressure and 80°C for 3 hours to dissolve, compatibilize, and disperse the adhesive layer, printed layer, and various resins, and the resin substrate detached from the laminate was recovered. Subsequently, the material was deliquidated using a centrifuge (Matsumoto Machinery LCA2000) at atmospheric pressure and 60°C, with a centrifugal force of 500G for 40 seconds, and the wetness of the resin substrate was observed by touch.

[0089] [Comparative Example 3] A laminate consisting of polyamide / printed layer / adhesive layer / polyethylene was crushed using a pulverizer to produce a pulverized material. The pulverized material was then immersed in release agent A at atmospheric pressure and 80°C for 3 hours and stirred to dissolve, compatibilize, and disperse the adhesive layer, printed layer, and various resins, and the resin substrate detached from the laminate was recovered. Subsequently, the material was deliquidated using a centrifuge (Matsumoto Machinery LCA2000) at atmospheric pressure and 50°C, with a centrifugal force of 500G for 40 seconds, and the wetness of the resin substrate was observed by touch.

[0090] [Comparative Example 4] A laminate consisting of polyamide / printed layer / adhesive layer / polyethylene was crushed using a pulverizer to produce a pulverized material. The pulverized material was then immersed in release agent A at atmospheric pressure and 80°C for 3 hours and stirred to dissolve, compatibilize, and disperse the adhesive layer, printed layer, and various resins, and the resin substrate detached from the laminate was recovered. Subsequently, the material was deliquidated using a centrifuge (Matsumoto Machinery LCA2000) at atmospheric pressure and 20°C, with a centrifugal force of 500G for 40 seconds, and the wetness of the resin substrate was observed by touch.

[0091] [result] After centrifugal deliquidation treatment at various temperatures, the treatments in Examples 3 and 4 resulted in less wetting and were superior. On the other hand, Comparative Examples 3 and 4 resulted in more wetting and were inferior to the examples.

[0092] Furthermore, experiments were conducted in which the processing temperature and processing time were varied. As a result, it was found that the immersion and stirring temperature and time were preferably 1 to 5 days, and more preferably 2 to 4 days, under conditions of 20°C to less than 60°C. Under conditions of 60°C or higher, it was found that 1 to 5 hours, and more preferably 2 to 4 hours, were preferred. For centrifugal deliquidation, it was found that a processing temperature of 60°C to less than 85°C and a centrifugal force of 200G to 2,000G were preferred.

[0093] [Example 5] A laminate consisting of a printed layer and polyethylene was crushed using a pulverizer. Next, the crushed material was immersed and stirred in release agent B at atmospheric pressure and 80°C for 3 hours to dissolve, compatibilize, and disperse the printed layer, and the resin substrate detached from the laminate was recovered. Subsequently, a deliquidation treatment was performed using a centrifuge (Matsumoto Machinery LCA2000) at atmospheric pressure and 80°C, with a centrifugal force of 500G for 40 seconds, and the wetness of the resin substrate was observed by touch.

[0094] [Example 6] A laminate consisting of a printed layer and polyethylene was crushed using a pulverizer. Next, the crushed material was immersed and stirred in release agent B at atmospheric pressure and 80°C for 3 hours to dissolve, compatibilize, and disperse the printed layer, and the resin substrate detached from the laminate was recovered. Subsequently, the material was deliquidated using a centrifuge (Matsumoto Machinery LCA2000) at atmospheric pressure and 60°C, with a centrifugal force of 500G for 40 seconds, and the wetness of the resin substrate was observed by touch.

[0095] [Comparative Example 5] A laminate consisting of a printed layer and polyethylene was crushed using a pulverizer. Next, the crushed material was immersed in release agent B at atmospheric pressure and 80°C for 3 hours and stirred to dissolve, compatibilize, and disperse the printed layer, and the resin substrate detached from the laminate was recovered. Subsequently, the material was deliquidated using a centrifuge (Matsumoto Machinery LCA2000) at atmospheric pressure and 50°C, with a centrifugal force of 500G for 40 seconds, and the wetness of the resin substrate was observed by touch.

[0096] [Comparative Example 6] A laminate consisting of a printed layer and polyethylene was crushed using a pulverizer. The crushed material was then immersed and stirred in release agent B at atmospheric pressure and 80°C for 3 hours to dissolve, compatibilize, and disperse the printed layer, and the resin substrate detached from the laminate was recovered. Subsequently, the material was deliquidated using a centrifuge (Matsumoto Machinery LCA2000) at atmospheric pressure and 20°C, with a centrifugal force of 500G for 40 seconds, and the wetness of the resin substrate was observed by touch.

[0097] [result] The results of centrifugal deliquidation treatment at various temperatures showed that the treatments in Examples 5 and 6 resulted in less wetting and were superior. On the other hand, Comparative Examples 5 and 6 resulted in more wetting and were inferior to the examples. Furthermore, the temperature and time for immersion and stirring are preferably 1 to 5 days, and more preferably 1 to 3 days, under conditions of 20°C to less than 60°C. Under conditions of 60°C or higher, 1 to 5 hours, and more preferably 1 to 3 hours. It was found that for centrifugal deliquidation, for example, a treatment temperature of 60°C to less than 85°C and a centrifugal force of 200G to 2,000G are preferable. [Industrial applicability]

[0098] The laminate peeling apparatus of the present invention can be used to separate each layer constituting a laminate when the laminate is to be reused. [Explanation of Symbols]

[0099] A: Treatment tank B: Input method C-1: Stripping agent input piping C-2: Cleaning shower inside the treatment tank D: means of heating the release agent E: Separation mechanism 1: Stripping agent tank 2: Liquid transfer pump 3: Switching valve 4: Motor 5: Heat exchanger (cooling) 6: Switching valve 7: Liquid transfer pump 8: Fluff after dehydration 9: Remover after use 11: Tank with heating function for stripping agent

Claims

1. A processing tank (A) equipped with a stirring means, An input means (B) for supplying the material to be processed, which is the shredded material obtained by cutting the laminate, into a processing tank (A), and The apparatus is equipped with a stripping agent supply means (C) for supplying a liquid stripping agent into a treatment tank (A), Prior to the release agent supply means (C), there is a release agent heating means (D), The laminate stripping apparatus is characterized in that the stripping agent supply means (C) has a stripping agent input pipe (C-1).

2. The stripping agent supply means (C) further comprises a laminate stripping apparatus having a cleaning shower (C-2) inside the processing tank.

3. The peeling apparatus according to claim 1 or 2, further comprising a separation mechanism (E) for the peeling agent and the treated resin downstream of the processing tank (A).

4. A method for peeling a laminate using the peeling apparatus described in claim 2, Step (I) of introducing the material to be treated and the liquid stripping agent into the treatment tank (A) The process is followed by step (I), and includes step (II) of performing a peeling treatment while stirring. In process (I), the release agent is introduced through the release agent introduction pipe (C-1). In process (II), the treatment is carried out while washing away the material to be treated that has adhered to the inner wall of the treatment tank (A) using the internal cleaning shower (C-2). A method for delaminating a laminate, characterized by the features described above.

5. A method for peeling a laminate using the peeling apparatus described in claim 3, Step (I): Adding the material to be treated and the liquid stripping agent to the treatment tank (A) Following step (I), step (II) is performed, which involves a peeling treatment while stirring, Following step (II), step (III) involves solid-liquid separation at 60-90°C. has A method for delaminating a laminate, characterized by the features described above.

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