JPS5915040B2 - Composite material separation and recovery equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for separating and recovering a cured crosslinked resin and a metal from a composite material in the form of powder, thread, or flake.

The crosslinked curable resin referred to herein refers to all of phenol formaldehyde resins, melamine formaldehyde resins, epoxy resins, crosslinked polyethylene, and other crosslinked curable resins, and each may be cured individually, or It may be a copolymer or co-condensate of two or more curable resins selected from these, and it may also be a modified product with drying oil, reactive diluent, etc. An agent or a plasticizer may coexist, or an organic or inorganic base material having a specific gravity lower than the metal may coexist.

The metals mentioned here are copper, iron, nickel, chromium, zinc,
Tin, gold, silver, platinum, rhodium, cobalt, aluminum, etc. may be used alone, or alloys thereof, or two or more metals selected from the elements and alloys may coexist.

The composite referred to herein is composed of a cured resin composition obtained by cross-linking and curing the above-mentioned cross-linked curable resin and the above-mentioned metal, each of which is bonded at an interface directly or via a suitable binder. are shared.

Specific examples of the powdered, granular, thread-like, or flaky composites include paper cloth-based phenolic resin copper-clad laminates, paper cloth-based epoxy resin copper-clad laminates, and synthetic fiber-based epoxy resin copper-clad laminates. Examples include chips from cutting copper-clad laminates such as boards.

The copper foil in the copper-clad laminate may be replaced with a metal other than copper, such as chrome foil or nickel foil, or may be a metal foil whose surface is plated with tin, silver, gold, or the like.

Furthermore, as examples of paralleling, thermosetting resin molded products with metal wires and metal terminals inside, plastic type molded products with thermosetting resin as a base, printed circuit boards with metal foil attached, or Examples include powdered materials obtained by finely pulverizing waste materials such as metal foil-clad thermosetting resin decorative boards using a crusher, mill, etc.

The materials listed in the example are normally discarded as useless, but they contain thermosetting resin components and metals that are useful as resources, and if separated and recovered, they can be used again for industrial purposes. It can be fully utilized as a raw material for products.

When large individual pieces of different shapes coexist as a composite material that is difficult to process in the present invention, they can be handled in the same way by sieving using an appropriate method.

The liquid separation medium referred to herein is one that satisfies at least the following two requirements.

The first is that it has the effect of swelling the cured product, and the second is that it has a higher specific gravity than the metal and lower specific gravity than the cured resin.

For example, in the case of chips generated during the processing of paper-based phenolic laminated copper clad boards, solvents consisting of organic halogen compounds such as trichloroethane, trichloroethylene, perchloroethylene, dichlorobenzene, and bromide benzene are used. Especially excellent.

In order to reuse the cured resin and metal separated and recovered from the composite material, it is necessary to (1) completely separate the metal components of the composite material;

(2) Do not add substances that may cause problems during recycling.

(3) Treatments that may cause excessive changes in material properties, such as high heat, strong acids, or strong bases, shall not be involved.

It is desirable that the following conditions are met.

These conditions, which could not be achieved with conventional devices, can now be achieved relatively easily and efficiently by implementing the present invention.

Explanation will be added below in the first flow sheet.

The composite material is passed through a vibrating sieve 1 to separate large pieces having different shapes.

The separated material is removed into a vat 2.

The composite material that has passed through the sieve is put into a popper 3, and quantitatively fed into a separation tank 6 by a screw feeder 4 and a packet conveyor 5.

The interior of the separation tank is filled with a liquid separation medium, which is quantitatively supplied from one side by a liquid separation medium supply pump 7 and quantitatively overflowed from the other side.

The composite material put into the separation tank 6 enters the liquid separation medium, and in a short time, due to the difference in specific gravity, the cured resin 8 floats up and the metal 9 settles and separates.

Furthermore, when the hardened resin and the metal are separated by the action of the liquid separation medium, the former floats and the latter settles.

In this case, the separation effect may be enhanced if the liquid separation medium in the separation tank 6 is made to flow by stirring or the like to some extent.

The precipitated metal 9 is deposited in a metal mesh vat 10 in the middle of the separation tank 6.

Therefore, in case of accumulation, the liquid separation medium in the liquid separation tank 6 is extracted through the liquid drain pipe 11, put into the liquid separation medium tank 12, and the remaining liquid separation medium is evaporated through the heating corrugated pipe 13. Take it out.

Note that during the separation work, a cooling pipe 14 is used in order to lower the internal temperature of the separation tank 6 as much as possible and prevent the liquid separation medium from scattering.

On the other hand, since the cured resin 8 is floating, it is swept toward the outlet side by the supplied liquid separation medium, overflows together with the liquid separation medium, and flows into the liquid separation medium separation device 15 .

In the liquid separation medium separation device 15, a wire mesh conveyor 16
At , the cured resin 8 and the liquid separation medium are separated.

The separated liquid separation medium is collected in a vat 17 and transferred to a liquid separation medium tank 12 via a pipe 18.

The cured resin 8 is sent to a continuous centrifuge 19 via a wire mesh conveyor 16.

In the continuous centrifuge 19, the screw feeder 20
The cured resin is quantitatively supplied into the rotating body 21.

A filter cloth 22 is provided on the inner surface of the rotating body 21, and the liquid separation medium in the cured resin is separated from the filter cloth 22.

The cured resin after centrifugation is passed through a conical screw 23.
is continuously scraped out.

The shape and mounting position of the screw 23 are determined by the diameter, length, rotation speed, etc. of the rotating body.

The separated liquid separation medium enters the liquid separation medium tank 12 again through the drain pipe 24.

The cured resin scraped out by the screw 23 is stored in a hopper 27 via a transport duct 25 and a cyclone 26 by pneumatic transport.

A fan 28 is used for air transportation.

The liquid separation medium that evaporates during transportation is recovered together with transportation air through a liquid separation medium recovery device 29 using activated carbon, and is put into the liquid separation medium tank 12.

The cured resin deposited in the hopper 27 is heated by the heating jacket 30 to completely evaporate the liquid separation medium.

At this time, stirring using the stirring device 31 can increase the effect.

The cured resin taken out from the outlet is packed into bags or cans 321.

Since the cost of this device is determined by how well the liquid separation medium is prevented from scattering, the gas emitted from various places is collected and passed through the condenser 33 to condense the liquid separation medium.

The condensed liquid separation medium is returned to the liquid separation medium storage tank 35 via piping 34.

The liquid separation medium storage tank 35 stores all the liquid separation medium when the apparatus is stopped, and is equipped with a cooling jacket.

[Brief explanation of drawings]

FIG. 1 is a flow sheet of the composite material separation and recovery apparatus of the present invention.

Claims (1)

[Claims] 1. For the purpose of separating and recovering the cured resin and the metal of a powdered, thread-like or flaky composite material consisting of a cured cross-linked curable resin and a metal, the curing is performed to separate the cured resin and the metal. A separation tank filled with a liquid separation medium that swells the resin, a centrifuge for separating the liquid separation medium after separation from the metal, a dryer for drying the cured resin from which the liquid separation medium has been separated, and a liquid separation. A composite material separation and recovery device consisting of a recovery device for recovering and reusing media.