JP6762574B2 - Method of separating composite members - Google Patents

Description

The present invention relates to a method for separating composite members and a separation device.

Conventionally, a method of separating a metal material and a resin material for recycling has been known for a composite member including a metal material and a resin material for coating the metal material. For example, Patent Document 1 discloses a method of heat-treating a coated electric wire to carbonize a resin coating material and separating the coating material and the copper wire. Further, Patent Document 2 discloses a method of separating a metal and a resin by stripping a part of the resin from a composite waste composed of a resin and a metal member, and then cooling and reheating the resin. Has been done.

Japanese Patent No. 5134719 Japanese Unexamined Patent Publication No. 2006-346636

However, in the conventional method, in the separation of the metal material and the resin material in the composite member, it is necessary to perform a heating or cooling treatment, or to peel off the resin material from the metal material. Therefore, the work of separating the metal material and the resin material in the composite member is very complicated, and the separation efficiency and the separation accuracy cannot be said to be sufficient.

The present invention provides a method for separating a composite member and a separating device capable of easily, efficiently, and accurately separating a metal material and a resin material.

The method for separating a composite member according to one aspect of the present invention is a method for separating a composite member that separates the metal material and the resin material from the composite member including the metal material and the resin material that coats the metal material. The method for separating the composite member includes a separation step of immersing the composite member in a separation liquid containing dichloromethane contained in a container to separate the metal material and the resin material. In at least a part of the separation step, the separated liquid in the container is discharged, the discharged separated liquid is filtered, and the filtered separated liquid is supplied into the container to circulate the separated liquid in the container while filtering. Perform the process.

According to the method for separating composite members, a separation step of immersing the composite member in a separation liquid containing dichloromethane is performed. Therefore, the resin material in the composite member can be swollen by the separation liquid, and the resin material can be easily peeled off from the metal material. As a result, the metal material and the resin material in the composite member can be easily separated.

Further, in at least a part of the separation step, a circulation step is performed in which the separation liquid in the container is circulated while being filtered. Therefore, the separation step can be performed while maintaining the purity of the separation liquid in a high state while removing impurities in the separation liquid. As a result, the metal material and the resin material in the composite member can be separated efficiently and accurately, and the effect can be maintained in a high state.

In particular, when a separation liquid containing dichloromethane is used, an adhesive or the like interposed between the metal material and the resin material of the composite member may float on the liquid surface of the separation liquid or precipitate in the separation liquid. Impurities such as suspended matter and precipitates cause a decrease in separation efficiency and separation accuracy between the metal material and the resin material. Therefore, by filtering the separation liquid in the container and circulating it while removing impurities, the separation efficiency and separation accuracy of the metal material and the resin material in the composite member can be effectively improved.

Further, by circulating the separation liquid in the container, it is possible to generate a liquid flow of the separation liquid in the container. As a result, the separation efficiency and separation accuracy of the metal material and the resin material in the composite member can be improved, and the volatilization of dichloromethane in the separation liquid is suppressed as compared with mechanical stirring, and the recycling cost of the composite member is reduced. it can.

Further, since the separation liquid is used while being filtered, the separation liquid can be used repeatedly. As a result, the recycling cost of the composite member can be reduced. Further, since the metal material and the resin material in the composite member can be separated with high accuracy, the metal material and the resin material can be sufficiently reused, and the recycling efficiency of the composite member can be improved.

In the method for separating the composite member, the separation liquid may be dichloromethane. In this case, the metal material and the resin material in the composite member can be separated more easily, efficiently, and accurately. In addition, the effect of circulating the separated liquid in the container while filtering can be further exhibited.

Further, in at least a part of the circulation step, the separation liquid in the container may be discharged from the upper part of the container, and the filtered separation liquid may be supplied into the container from the lower part of the container. In this case, the suspended matter on the liquid surface of the separation liquid can be efficiently discharged from the upper part of the container. In addition, a liquid flow from the bottom to the top of the separation liquid is generated in the container, and the precipitate in the separation liquid can be carried from the bottom to the top and efficiently discharged from the upper part of the container. As a result, impurities in the separation liquid can be efficiently filtered.

Further, in a part of the circulation step, the separation liquid in the container may be discharged from the lower part of the container, and the filtered separation liquid may be supplied into the container from the upper part of the container. In this case, a liquid flow from the top to the bottom of the separation liquid can be generated in the container. For example, the bottom-to-top liquid flow and the top-to-bottom liquid flow of the separated liquid can be alternately generated in the container to improve the filtration efficiency of the separated liquid.

The composite member separating device according to another aspect of the present invention is a composite member separating device that separates a metal material and a resin material from a composite member including a metal material and a resin material that covers at least a part of the metal material. Is. The composite member separation device includes a container for containing the separation liquid containing dichloromethane, a discharge unit provided in the container for discharging the separation liquid in the container, and a supply unit provided in the container for supplying the separation liquid into the container. A circulation unit that connects the discharge unit and the supply unit, and a filtration unit that is provided in the circulation unit and filters the separated liquid.

According to the above-mentioned separation device for composite members, the composite member can be immersed in a separation liquid containing dichloromethane contained in a container to perform a separation step of separating the metal material and the resin material. Further, in the separation step, the separation liquid in the container is discharged from the discharge part of the container, the discharged separation liquid is filtered by the filtration part, and the filtered separation liquid is supplied from the supply part of the container into the container. A circulation step can be performed in which the separated liquid in the container is circulated while being filtered. As a result, the same effect as that of the method for separating the composite member can be obtained.

In the separating device for the composite member, the separating liquid may be dichloromethane. In this case, the metal material and the resin material in the composite member can be separated more easily, efficiently, and accurately. In addition, the effect of circulating the separated liquid in the container while filtering can be further exhibited.

Further, the discharge unit may include an upper discharge unit provided at the upper part of the container, and the supply unit may include a lower supply unit provided at the lower part of the container. In this case, the suspended matter on the liquid surface of the separation liquid can be efficiently discharged from the upper discharge portion of the container. In addition, a liquid flow is generated in the container from the bottom to the top, and the precipitate in the separation liquid can be carried from the bottom to the top and efficiently discharged from the upper discharge portion of the container. As a result, impurities in the separation liquid can be efficiently filtered.

Further, the discharge unit may further include a lower discharge unit provided at the lower part of the container, and the supply unit may further include an upper supply unit provided at the upper part of the container. In this case, a liquid flow from the top to the bottom of the separation liquid can be generated in the container. For example, the bottom-to-top liquid flow and the top-to-bottom liquid flow of the separated liquid can be alternately generated in the container to improve the filtration efficiency of the separated liquid.

It is explanatory drawing which shows the separation apparatus of 1st Embodiment. It is a perspective view which shows an example of a composite member. It is explanatory drawing which shows the separation process in the separation method of the composite member using the separation apparatus of 1st Embodiment. It is explanatory drawing which shows the separation process in the separation method of the composite member using the separation apparatus of 2nd Embodiment. It is explanatory drawing which shows the separation process in the separation method of the composite member using the separation apparatus of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First Embodiment)
First, a separating device for composite members (hereinafter, simply referred to as a separating device) will be described.
As shown in FIG. 1, the separation device 1 includes a metal container 2. The container 2 has a cylindrical main body 21, a bottom 22 that closes the lower end of the main body 2, and a lid 23 that closes the upper end of the main body 21. The lid portion 23 is configured so that the upper end of the main body portion 21 can be opened and closed.

The separation liquid 10 is contained in the container 2. As the separation solution 10, commercially available dichloromethane (methylene chloride, CH ₂ Cl ₂ ) is used. The separation liquid 10 of the present embodiment has a dichloromethane content of 99% by mass or more and a methyl alcohol content of 0.5% by mass added as a stabilizer.

The container 2 has a discharge port (discharge unit) 24 for discharging the separation liquid 10 in the container 2 and a supply port (supply unit) 25 for supplying the separation liquid 10 into the container 2. The discharge port 24 is provided above the main body 21 of the container 2. The supply port 25 is provided in the lower part of the main body 21 of the container 2.

The separation device 1 includes a circulation unit 3 that connects the discharge port 24 and the supply port 25 of the container 2. The circulation portion 3 is provided outside the container 2. The circulation portion 3 is formed in a tubular shape so that the separation liquid 10 can be circulated inside.

In the middle of the circulation unit 3, a pump 4 for circulating the separation liquid 10 through the circulation unit 3 is provided. By driving the pump 4, the separation liquid 10 in the container 2 can be discharged from the discharge port 24 of the container 2, the circulation unit 3 can be circulated, and the liquid can be supplied into the container 2 from the supply port 25 of the container 2. That is, the separation liquid 10 in the container 2 can be circulated.

A filtration unit 5 for filtering the separation liquid 10 is provided in the middle of the circulation unit 3 and in front of the pump 4 (on the discharge port 24 side of the pump 4 in the circulation unit 3). In the present embodiment, the filtration unit 5 includes a bag filter (bag-shaped filter) as a filter medium. Impurities in the separation liquid 10 are removed by passing the separation liquid 10 flowing through the circulation unit 3 through the bag filter of the filtration unit 5.

Next, the composite member will be described.
As shown in FIG. 2, the composite member 11 is an automobile part to be recycled, which is composed of a long metal material 111 and a resin material 112 that covers a part of the surface of the metal material 111. .. The resin material 112 is joined to the surface of the metal material 111 by using an adhesive or the like. In the present embodiment, the metal material is made of stainless steel (SUS steel), and the resin material is made of polyvinyl chloride (PVC).

Next, a method for separating the composite member (hereinafter, simply referred to as a separation method) will be described.
As shown in FIG. 3, the lid 23 of the container 2 of the separation device 1 is opened, and a plurality of composite members 11 are charged into the separation liquid 10 housed in the container 2. Then, the lid 23 of the container 2 is closed to keep the inside of the container 2 sealed.

When the composite member 11 is charged into the separation liquid 10, the composite member 11 may be charged into the separation liquid 10 as it is, or the composite member 11 may be added and removed easily. You may put it in a container such as a net basket and put it in the separation liquid 10.

Next, the composite member 11 is immersed in the separation liquid 10 in the container 2 for a predetermined time to separate the metal material 111 and the resin material 112 in the composite member 11 (separation step). The immersion time can be appropriately set depending on the size, number, material, etc. of the composite member 11.

Then, while the composite member 11 is immersed in the separation liquid 10, the separation liquid 10 in the container 2 is circulated while being filtered (circulation step). Specifically, the pump 4 is driven to discharge the separation liquid 10 in the container 2 from the discharge port 24 of the container 2, the circulation unit 3 is circulated, and the liquid is supplied into the container 2 from the supply port 25 of the container 2 ( (Solid arrow in FIG. 3). Impurities in the separation liquid 10 are removed by passing the separation liquid 10 flowing through the circulation part 3 through the bag filter of the filtration unit 5 provided in the middle of the circulation part 3.

Further, the separation liquid 10 in the container 2 is discharged from the discharge port 24 of the container 2 and continuously supplied into the container 2 from the supply port 25 of the container 2 to circulate the separation liquid 10 in the container 2. As a result, a liquid flow (upward) from the bottom to the top of the separation liquid 10 is generated in the container 2 (dotted line arrow in FIG. 3).

In this way, the composite member 11 is immersed in the separation liquid 10 in the container 2 for a predetermined time, and the separation liquid 10 in the container 2 is circulated while being filtered, whereby the resin material 112 in the composite member 11 is swollen by the separation liquid 10. The resin material 112 is peeled off from the metal material 111. Then, the metal material 111 and the resin material 112 in the composite member 11 are separated.

After immersing the composite member 11 in the separation liquid 10 in the container 2 for a predetermined time, the composite member 11 is taken out from the container 2. At this time, the metal material 111 and the resin material 112 are taken out in a separated state or in a easily separable state. Then, the taken-out metal material 111 and the resin material 112 are dried, respectively, to obtain the metal material 111 and the resin material 112 in a reusable state.

Next, the action and effect of the separation method of the present embodiment will be described.
According to the separation method of the present embodiment, the separation step of immersing the composite member 11 in the separation liquid 10 containing dichloromethane is performed. Therefore, the resin material 112 in the composite member 11 can be swollen by the separation liquid 10, and the resin material 112 can be easily peeled off from the metal material 111. As a result, the metal material 111 and the resin material 112 in the composite member 11 can be easily separated.

Further, in the separation step, a circulation step is performed in which the separation liquid 10 in the container 2 is circulated while being filtered. Therefore, the separation step can be performed while maintaining the purity of the separation liquid 10 in a high state while removing impurities in the separation liquid 10. As a result, the metal material 111 and the resin material 112 in the composite member 11 can be separated efficiently and accurately (cleanly), and the effect can be maintained in a high state.

In particular, when a separation liquid containing dichloromethane is used, an adhesive or the like interposed between the metal material 111 and the resin material 112 of the composite member 11 floats on the liquid surface of the separation liquid 10 or precipitates in the separation liquid 10. To do. Such impurities such as suspended matter and precipitate become a factor that lowers the separation efficiency and separation accuracy of the metal material 111 and the resin material 112. Therefore, by filtering the separation liquid 10 in the container 2 and circulating it while removing impurities, the separation efficiency and separation accuracy of the metal material 111 and the resin material 112 in the composite member 11 can be effectively improved.

Further, by circulating the separation liquid 10 in the container 2, it is possible to generate a liquid flow of the separation liquid 10 in the container 2. Therefore, the flow of the separation liquid 10 can promote the separation of the metal material 111 and the resin material 112 in the composite member 11. As a result, the separation efficiency and separation accuracy of the metal material 111 and the resin material 112 in the composite member 11 can be improved, and the volatilization of dichloromethane in the separation liquid 10 is suppressed as compared with mechanical stirring, and the composite member 11 Recycling cost can be reduced.

Further, since the separation liquid 10 is used while being filtered, the separation liquid 10 can be used repeatedly. As a result, the recycling cost of the composite member 11 can be reduced. Further, since the metal material 111 and the resin material 112 in the composite member 11 can be separated with high accuracy, the metal material 111 and the resin material 112 can be sufficiently reused, and the recycling efficiency of the composite member 11 can be improved.

In the separation method of this embodiment, the separation liquid 10 is dichloromethane. Therefore, the metal material 111 and the resin material 112 in the composite member 10 can be separated more easily, efficiently, and accurately. Further, the effect of circulating the separation liquid 10 in the container 2 while filtering can be further exhibited.

Further, in the circulation step, the separation liquid 10 in the container 2 is discharged from the upper part of the container 2, and the filtered separation liquid 10 is supplied into the container 2 from the lower part of the container 2. Therefore, the suspended matter on the liquid surface of the separation liquid 10 can be efficiently discharged from the upper part of the container 2. Further, a liquid flow (upward) from the bottom to the top of the separation liquid 10 is generated in the container 2, and the precipitate in the separation liquid 10 can be carried from the bottom to the top and efficiently discharged from the upper part of the container 2. .. As a result, impurities in the separation liquid 10 can be efficiently filtered.

(Second Embodiment)
As shown in FIGS. 4 and 5, the present embodiment is an example in which the configurations of the main body 2 and the circulation 3 of the separation device 1 are changed. The description of the same configuration and action / effect as in the first embodiment will be omitted.

The container 2 has a first discharge port (upper discharge part) 24a, a second discharge port (lower discharge part) 24b, a first supply port (lower supply part) 25a, and a second supply port (upper supply part) 25b. The first discharge port 24a and the second supply port 25b are provided on the upper portion of the main body 21 of the container 2. The second discharge port 24b and the first supply port 25a are provided in the lower part of the main body 21 of the container 2.

The circulation unit 3 has a first main distribution unit 31, a second main distribution unit 32, a first sub-distribution unit 33, and a second sub-distribution unit 34. The first main distribution unit 31 connects between the first discharge port 24a of the container 2 and the filtration unit 5. The second main distribution unit 32 connects the filtration unit 5 and the first supply port 25a of the container 2. The first sub-distribution unit 33 connects the second discharge port 24b of the container 2 and the middle of the first main distribution unit 31. The second sub-distribution unit 34 connects the second supply port 25b of the container 2 and the middle of the second main distribution unit 32.

In the first main distribution section 31, a first valve 311 is provided between the portion where the first discharge port 24a of the container 2 and the first sub-distribution section 33 meet. In the second main distribution unit 32, a pump 4 is provided between the filtration unit 5 and the portion where the second sub-distribution unit 34 joins. Further, a third valve 321 is provided between the portion where the second sub-distribution unit 34 joins and the first supply port 25a of the container 2. The first sub-distribution unit 33 is provided with a third valve 331. The second sub-distribution unit 34 is provided with a fourth valve 341.

The first valve 311, the second valve 321 and the third valve 331 and the fourth valve 341 of the circulation unit 3 can switch the flow and cutoff of the separation liquid 10 in the circulation unit 3 by switching the opening and closing.

Specifically, as shown in FIG. 4, by setting the first valve 311 and the second valve 321 to "open" and the third valve 331 and the fourth valve 341 to "close", the separating liquid in the container 2 is set. 10 is discharged from the first discharge port 24a of the container 2. Then, the first main distribution unit 31, the filtration unit 5, and the second main distribution unit 32 are circulated in this order, and are supplied into the container 2 from the first supply port 25a of the container 2 (solid arrow in FIG. 4). By passing the separation liquid 10 through the filtration unit 5, impurities in the separation liquid 10 are removed.

Further, the separation liquid 10 in the container 2 is discharged from the first discharge port 24a of the container 2 and continuously supplied into the container 2 from the first supply port 25a of the container 2, and the separation liquid in the container 2 is continuously supplied. By circulating the 10, a liquid flow (upward) from the bottom to the top of the separation liquid 10 is generated in the container 2 (dotted line arrow in FIG. 4).

On the other hand, as shown in FIG. 5, by setting the first valve 311 and the second valve 321 to “close” and the third valve 331 and the fourth valve 341 to “open”, the separation liquid 10 in the container 2 becomes a container. It is discharged from the second discharge port 24b of 2. Then, the first sub-distribution unit 33, the first main distribution unit 31, the filtration unit 5, the second main distribution unit 32, and the second sub-distribution unit 34 are distributed in this order, and the inside of the container 2 is distributed from the second supply port 25b of the container 2. (Solid arrow in FIG. 5). By passing the separation liquid 10 through the filtration unit 5, impurities in the separation liquid 10 are removed.

Further, the separation liquid 10 in the container 2 is discharged from the second discharge port 24b of the container 2 and continuously supplied into the container 2 from the second supply port 25b of the container 2, and the separation liquid in the container 2 is continuously supplied. By circulating the 10, a liquid flow (downward) from the top to the bottom of the separation liquid 10 is generated in the container 2 (dotted line arrow in FIG. 5).

In the present embodiment, in the circulation step, the first circulation step shown in FIG. 4 and the second circulation step shown in FIG. 5 are repeatedly performed. In addition, the first circulation step is mainly performed, and the second circulation step is periodically (at regular intervals) for a predetermined time. The time for performing the first circulation step and the second circulation step can be set as appropriate.

In the present embodiment, in a part of the circulation step, the separation liquid 10 in the container 2 is discharged from the lower part of the container 2, and the filtered separation liquid 10 is supplied into the container 2 from the upper part of the container 2. Therefore, a liquid flow (downward) from the top to the bottom of the separation liquid 10 can be generated in the container 2. As in the present embodiment, the liquid flow from the bottom to the top (upward) and the liquid flow from the top to the bottom (downward) of the separation liquid 10 are alternately generated in the container 2, and the separation liquid 10 is generated. Filtration efficiency can be increased.

(Other embodiments)
It goes without saying that the present invention is not limited to the above-described embodiment, and can be implemented in various embodiments without departing from the present invention.

(1) Examples of the metal material constituting the metal material of the composite member include iron, copper, aluminum, and alloys thereof. Further, examples of the iron alloy include stainless steel and the like.

(2) Examples of the resin material constituting the resin material of the composite member include general-purpose plastics such as polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and polystyrene (PS).

(3) In the above embodiment, while the separation step of immersing the composite member in the separation liquid is performed, the circulation step of circulating the separation liquid in the container while filtering is performed. For example, in a part of the separation step. A circulation step may be performed.

(4) In the above embodiment, the separation solution is dichloromethane. A small amount of alcohol or the like may be added to dichloromethane as a stabilizer for antioxidants and the like. In the separation liquid, the content of dichloromethane is preferably 99% by mass or more.

(5) In the above embodiment, a cylindrical container is arranged vertically as a container for accommodating the separation liquid. For example, a cylindrical container is arranged horizontally and the container can be rotated about an axis. A so-called drum-type container configured in may be used. In this case, in the separation step, the composite member is immersed in the separation liquid contained in the container, the container is rotated about the axis, and the metal material and the resin material are separated. Further, in the separation step, as in the above embodiment, a circulation step of circulating the separated liquid in the container while filtering it may be performed. By using the drum type container, the metal material and the resin material can be easily, efficiently and accurately separated with a small amount of separating liquid. As a result, the recycling cost of the composite member can be reduced, and the recycling efficiency of the composite member can be improved.

(6) In the above embodiment, a bag filter is used as the filter medium of the filtration unit for filtering the separation liquid, but the filter medium may be any filter medium capable of filtering impurities in the separation liquid, for example, a mesh filter or the like. Various filters can be used.

(7) The functions of one component in the above embodiment may be dispersed as a plurality of components, or the functions of the plurality of components may be integrated into one component. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added or replaced with the configuration of the other embodiment. It should be noted that all aspects included in the technical idea specified from the wording described in the claims are embodiments of the present invention.

1 ... Separation device, 2 ... Container, 3 ... Circulation part, 5 ... Filtration part, 10 ... Separation liquid, 11 ... Composite member, 24 ... Discharge part, 25 ... Supply part, 111 ... Metal material, 112 ... Resin material

Claims (3)

A composite member comprising a metal material and a resin material adhered to the surface of the metal material via an adhesive so as to cover at least a part of the metal material, and a composite that separates the metal material and the resin material. It is a method of separating members,
The composite member is immersed in a separation liquid made of dichloromethane contained in a container, and the resin material in the composite member is peeled from the metal material by the separation liquid to separate the metal material and the resin material. Separation process and
A step of taking out the resin material peeled from the metal material from the container is provided.
In at least a part of the separation step, the separation liquid in the container is discharged, the discharged separation liquid is filtered, and the filtered separation liquid is supplied into the container to separate the separation liquid in the container. A method for separating composite members, in which a circulation step of circulating the liquid while filtering it is performed. The composite according to claim 1, wherein in at least a part of the circulation step, the separation liquid in the container is discharged from the upper part of the container, and the filtered separation liquid is supplied into the container from the lower part of the container. Method of separating members. The composite member according to claim 2, wherein in a part of the circulation step, the separation liquid in the container is discharged from the lower part of the container, and the filtered separation liquid is supplied into the container from the upper part of the container. Separation method.