JP2011231277A - Dissolving treatment device of resin composite and method for dissolving treatment of resin composite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dissolving treatment device of a resin composite and a method for a dissolving treatment of a resin composite, capable of continuously subjecting the resin composite formed of at least a polyurethane resin and a polypropylene resin to the treatment with high efficiency at low cost by dissolving and separating the polyurethane resin and collecting the polypropylene resin.SOLUTION: The dissolving treatment device 1 includes: an introducing means 2; dissolving baths 3a, 3b, and 3c; a collecting and discharging means 5; and a treatment liquid recycling means 6. The polyurethane resin of a composite 10 is dissolved, the polyurethane resin and the polypropylene resin are separated, and the polypropylene resin 11 is discharged (collected).

Description

  TECHNICAL FIELD The present invention relates to a resin composite dissolution treatment apparatus and a resin composite dissolution treatment method, and in particular, a resin composite formed of at least a polyurethane resin and a polypropylene resin is dissolved in the polyurethane resin to obtain a polyurethane resin. The present invention relates to a resin composite dissolution treatment apparatus and a resin composite dissolution treatment method that can be efficiently and continuously processed by separating and recovering polypropylene resin.

In promoting effective use of earth resources, it is extremely important to recycle resin waste materials.
In addition, when a resin waste material such as an electric product contains a plurality of resins (for example, a polypropylene resin as a base and a polyurethane resin as a coating film on the surface), it is reused from a resin composite containing a plurality of resins. There is a demand for recovering a resin (for example, a polypropylene resin), and various techniques have been researched and developed.

  For example, Patent Document 1 discloses a pulverization process in which a synthetic resin waste material with a coating film is pulverized to form a pulverized material, a first quantitative feeding process in which the pulverized material is continuously and quantitatively sent, The above coating film is continuously hydrolyzed with steam at a predetermined temperature and pressure in a hydrolysis tank equipped with screw blades, and the pulverized material to which the hydrolyzed film is adhered is dried. A drying step, a second quantitative feeding step for sending the dried hydrolyzed material continuously and quantitatively, a melt-kneading step for melt-kneading the crushed material to which the fed coating film adheres to obtain a kneaded material, A technique of a continuous regeneration method of a synthetic resin waste material with a coating film, comprising: a pellet material manufacturing process in which a kneaded material discharged from a melt-kneading process is cooled to a predetermined length and then pelletized is disclosed.

  Further, in Patent Document 2, in a extruder, a molten resin with a urethane coating is brought into contact with high-temperature / high-pressure benzyl alcohol and / or benzyl alcohol vapor to finely disperse the urethane coating in the molten resin. When the resin with urethane coating is regenerated, the benzyl alcohol contains 0.1 to 2.0% by weight of an alkali catalyst, and the resin with urethane coating and high-temperature / high-pressure benzyl alcohol and / or A continuous adjustment treatment of resin with urethane coating, which is equipped with a pressure adjustment mechanism in the contact zone with benzyl alcohol vapor, decomposes the urethane coating under certain temperature and pressure conditions, and finely disperses it in the molten resin. Legal technology is disclosed.

JP-A-6-55539 JP 7-290456 A

However, although the techniques of Patent Documents 1 and 2 described above have atomized or decomposed / reduced urethane resin, they are kneaded into the underlying polypropylene resin, so that, for example, only the polypropylene resin is to be recovered. It was not possible to meet such a request at all. That is, it has been desired to establish a technique for separating a polypropylene resin and a polyurethane resin from a resin composite containing a polypropylene resin as a base and a polyurethane resin as a coating film and recovering the polypropylene resin.
Moreover, when processing said resin composite, it was desired to process efficiently and continuously at low cost. In other words, in order to actively promote the effective use of global resources, it is necessary to establish practical technologies with excellent economic efficiency and productivity, and to disseminate such practical technologies widely. .

  The present invention has been proposed in order to meet the above-described demands, and is obtained by dissolving a polyurethane resin from a resin composite having a polyurethane resin portion and a polypropylene resin portion and recovering the polypropylene resin. It is an object of the present invention to provide a resin composite dissolution treatment apparatus and a resin composite dissolution treatment method that can be efficiently and continuously processed at a low cost.

  In order to achieve the above object, the resin composite dissolution treatment apparatus of the present invention is a resin composite dissolution treatment apparatus formed of at least a polyurethane resin and a polypropylene resin. A treatment liquid for dissolving the polyurethane resin of the charged resin composite is stored, a dissolution tank means having a multistage structure, and the treatment liquid and the dissolution liquid containing the dissolved polyurethane resin discharged from the dissolution tank means A separation / recovery means for separating the polypropylene resin that has not been collected, collecting the treatment liquid, and discharging the polypropylene resin; and a residue separation means for separating the residue from the collected treatment liquid, and reusing the treatment liquid And a processing liquid recycling means.

  The resin composite dissolution treatment method of the present invention is a resin composite dissolution treatment method formed of at least a polyurethane resin and a polypropylene resin. Using the treatment liquid stored in the tank means, the dissolving step of dissolving the polyurethane resin of the charged resin composite; and the treatment liquid containing the dissolved polyurethane resin discharged from the dissolution tank means; The polypropylene resin that is not dissolved is separated, the processing liquid is recovered, the recovery discharge process for discharging the polypropylene resin, the residue is separated from the recovered processing liquid, and the processing liquid is reused. It is a method having steps and the like.

  According to the resin composite dissolution treatment apparatus and resin composite dissolution treatment method of the present invention, the polyurethane resin is dissolved in at least the resin composite formed of the polyurethane resin and the polypropylene resin, and the polyurethane resin is separated. By recovering the polypropylene resin, it can be efficiently and continuously processed at a low cost.

FIG. 1 shows a schematic diagram of a main part for explaining the dissolution treatment apparatus according to the first embodiment of the present invention. FIG. 2: has shown the schematic flowchart figure for demonstrating the melt | dissolution processing method concerning one Embodiment of this invention. FIG. 3: is the schematic of the principal part for demonstrating the dissolution tank means of the dissolution processing apparatus concerning 2nd embodiment of this invention, (a) has shown sectional drawing of the front direction, (b) Shows an AA arrow view. FIG. 4: has shown schematic sectional drawing of the principal part for demonstrating the dissolution tank means of the dissolution processing apparatus concerning 3rd embodiment of this invention. FIG. 5: has shown schematic sectional drawing of the principal part for demonstrating the dissolution tank means of the continuous dissolution processing apparatus concerning the application example of 3rd embodiment of this invention.

[First embodiment of dissolution treatment apparatus for resin composite]
FIG. 1 shows a schematic diagram of a main part for explaining the dissolution treatment apparatus according to the first embodiment of the present invention.
In FIG. 1, the dissolution processing apparatus 1 of the present embodiment is configured to include an input unit 2, dissolution tanks 3 a, 3 b, 3 c, a recovery / discharge unit 5, and a processing liquid reuse unit 6.
The dissolution treatment apparatus 1 dissolves a polyurethane resin (not shown) of a resin composite 10 (appropriately abbreviated as composite 10) formed of at least a polyurethane resin and a polypropylene resin to separate the polyurethane resin. Then, the polypropylene resin 11 is discharged (collected).

(Composite)
In the present embodiment, the composite 10 normally includes a polypropylene resin (PP) as a base and a polyurethane resin as a coating film on the surface. The resin composite of the present invention is a generic term for a resin composite formed of at least a polyurethane resin and a polypropylene resin.
In addition, the composite 10 is pulverized in advance by a pulverizing means (not shown) so that the maximum length is about several mm (preferably about 2 mm to 10 mm, more preferably about 2 mm to 6 mm). Yes (Pelletized) Furthermore, when the pellets of the above size are processed, there is no need to pelletize again when the polypropylene resin 11 obtained after the dissolution process is reused, so that the cost can be reduced.

(Input method)
The charging means 2 includes a net conveyor 21, a cleaning device 22, a hopper 23, and the like. This input means 2 inputs the pellet-shaped composite 10 into the dissolution tank 3a.
The net conveyor 21 has a wire net with a finer mesh than the size of the pellet-shaped composite 10 and transports the placed composite 10 to the hopper 23. If it does in this way, the composite 10 can be thrown in continuously and the composite 10 can be processed efficiently compared with a batch system.

The cleaning device 22 includes a cleaning tank, a pump, a filter, a shower nozzle, a pressure gauge, a valve, and the like. The cleaning device 22 is provided at substantially the center of the net conveyor 21, and sprays a cleaning liquid onto the composite 10 conveyed by the net conveyor 21 to clean the composite 10. This cleaning liquid is a liquid having substantially the same components as the processing liquid 12 described later, and is used at about room temperature. If it does in this way, the malfunction that a foreign material mixes in the dissolution tank 3a as a dissolution tank means can be prevented. Furthermore, since the pulverized composite 10 is in a wet state (sealed state) with the cleaning liquid, it can be quickly immersed in the processing liquid 12 when it is put into the dissolution tank 3a. In addition, since the cleaning liquid of the cleaning device 22 is substantially the same component as the processing liquid 12 (usually a processing liquid that does not include a catalyst component), it is possible to prevent problems such as adversely affecting the processing liquid 12 in the dissolution tank 3a. it can.
Moreover, the lower end of the hopper 23 communicates with the dissolution tank 3 a, and the composite 10 that falls from the net conveyor 21 is put into the dissolution tank 3 a via the hopper 23.

(Dissolution tank means)
The dissolution tank means of this embodiment is a multistage continuous apparatus having three single tanks, that is, dissolution tanks 3a, 3b, and 3c. Moreover, the process tank 12 which melt | dissolves the polyurethane resin of the thrown-in composite 10 is stored in dissolution tank 3a, 3b, 3c. Thus, by having a multistage configuration, the residence time distribution of the treatment liquid 12 and the composite 10 in each of the dissolution tanks 3a, 3b, and 3c can be made uniform. That is, it is possible to prevent a problem that the composite 10 that is continuously fed out from the multistage continuous apparatus in a very short time after being thrown in, and to maintain a predetermined processing time in total. Therefore, it is possible to improve the quality of the polypropylene resin 11 to be reused after collection (the problem that the polyurethane resin remains in the polypropylene resin 11 does not occur).
The dissolution tank means is not limited to the above-described configuration, and may have a multi-stage configuration such as a horizontal multi-stage tank 41 and vertical multi-stage tanks 42 and 43 described later. Moreover, the quantity of a single tank is not limited to three, It sets according to the request | requirement of residence time distribution, etc.

Moreover, the dissolution tanks 3a, 3b, and 3c have lower installation heights in order, and the dissolution tank 3a and the dissolution tank 3b communicate with each other via a valve 34 and a pipe 35. The valve 34 is connected to the upper part (or middle part) of the dissolution tank 3a, and the downstream end of the pipe 35 is connected to the upper part of the dissolution tank 3b. Thereby, when the valve 34 is opened, the treatment liquid 12, the composite 10, the polypropylene resin 11 and the like in the dissolution tank 3a flow into the dissolution tank 3b by potential energy.
The dissolution tank 3b and the dissolution tank 3c are also communicated in the same manner as described above.
Furthermore, the dissolution tank 3 c and the recovery / discharge means 5 are communicated with each other via a valve 34 and a pipe 36. The valve 34 is connected to the upper part (or middle part) of the dissolution tank 3 c, and the downstream end of the pipe 36 is located on the net conveyor 53 of the recovery / discharge unit 5. Thereby, when the valve 34 is opened, the treatment liquid 12 (including the dissolved polyurethane resin) and the polypropylene resin 11 in the dissolution tank 3 c and the polypropylene resin 11 are discharged onto the net conveyor 53 in the recovery tank 51 by potential energy. .

In the present embodiment, the valve 34 and the pipe 35 are used. However, the present invention is not limited to this. For example, although not shown, a flow path for overflow may be provided.
Further, although not shown, the valve 34 of the present embodiment may be connected to the lower portions of the dissolution tanks 3a, 3b, and 3c, so that the composite 10 put on the liquid surface can be used for a very short time. Therefore, it is possible to prevent a problem such as coming out of the valve 34.

The dissolution tanks 3a, 3b, and 3c have a stirring means 31, a heating means 32, and a cooling means 33.
The stirring means 31 has an impeller, a shaft, a motor, and the like, and stirs the processing liquid 12 in the tank. Here, the shape of the impeller is preferably a shape that causes a vertical circulation motion in order to disperse the composite 10 more uniformly in the treatment liquid 12. This is because the polypropylene resin usually floats in the treatment liquid 12 and the filler sinks, but these can be dispersed almost uniformly by stirring so as to bring up and down circulation motion.

Moreover, the heating means 32 has an automatic control valve, a temperature sensor, a temperature controller, and a heating member having a flow path. The heating members are provided in the middle and lower parts of the tank, and circulate the heat transfer oil. As a result, the treatment liquid 12 is heated.
Furthermore, the cooling means 33 has a heat exchanger or the like for cooling the gas in the upper part of the tank (this gas is almost the vapor of the processing liquid 12), and circulates cooling water through the heat exchanger. Thereby, the vapor | steam of the process liquid 12 can be cooled and returned to the process liquid 12 in a tank, and the process liquid 12 can be reused.

In the present embodiment, the conditions of the dissolution tanks 3a, 3b, and 3c are substantially the same.
That is, in this embodiment, the liquid temperature of the treatment liquid 12 is about 145 ° C. (a temperature about 10 ° C. lower than the softening temperature of the polypropylene resin).
The pressure in the tank is normal pressure. This eliminates the need for a pressure-resistant structure and can reduce the equipment cost.
The total dissolution time for each dissolution tank 3a, 3b, 3c is set according to the dissolution rate, the required solubility, etc., but is usually about 10 minutes to 10 hours.
Further, the treatment liquid 12 is usually supplied in an amount of about 2 to 20 times, preferably 3 to 6 times (volume ratio) to the composite 10 to be charged.

(Processing liquid)
The treatment liquid 12 of this embodiment contains benzyl alcohol as a solvent and tripotassium phosphate as a catalyst.
Moreover, the process liquid 12 is not limited to the above, What is necessary is just to contain alcohol, ketones, or ethers. In this way, the polyurethane resin can be dissolved in a short time even under atmospheric pressure. Therefore, since a pressure-resistant structure or the like is not required, the equipment cost can be reduced, the time until melting can be shortened, and the running cost can be reduced.

Examples of alcohols, ketones or ethers include benzyl alcohol, ethylene glycol, ethylene glycol monomethyl ether, diisobutyl ketone, methylcyclohexanone, and diethylene glycol dimethyl ether.
The dissolution of the polyurethane resin by the treatment liquid 12 includes swelling of the polyurethane resin by the treatment liquid 12, decomposition of the polyurethane resin, separation from the polyurethane resin composite 10, dissolution in the treatment liquid 12, and the like.

(Recovery discharge means)
The collection discharge means 5 has a collection tank 51, a cleaning device 52, a net conveyor 53, and the like. The collection tank 51 and the cleaning device 52 are installed side by side, and the net conveyor 53 is installed in a state where the upstream portion is stored in the recovery tank 51 and the central portion is stored in the cleaning device 52. The The recovery / discharge means 5 separates the treatment liquid 12 containing the dissolved polyurethane resin discharged from the dissolution tank 3c from the undissolved polypropylene resin 11, collects the treatment liquid 12, and discharges the polypropylene resin 11.

  As described above, the collection tank 51 stores the upstream portion of the net conveyor 53, and the downstream end of the pipe 36 is positioned on the net conveyor 53. Thereby, when the valve 34 of the dissolution tank 3c is opened, the treatment liquid 12 and the polypropylene resin 11 in the dissolution tank 3c are discharged onto the net conveyor 53 in the recovery tank 51 by potential energy. And the processing liquid 12 etc. which the discharge | released process liquid 12 and polypropylene resin 11 pass through the wire net | network of the net conveyor 53 are stored by the collection tank 51, and the polypropylene resin 11 is mounted on a wire net | network. And conveyed by the net conveyor 53. That is, the recovery / discharge unit 5 separates the polypropylene resin 11 from the treatment liquid 12, can easily collect the treatment liquid 12, and can continuously discharge the separated polypropylene resin 11. That is, the composite 10 can be processed efficiently compared to the batch method.

The cleaning device 52 includes a cleaning tank, a pump, a filter, a shower nozzle, a pressure gauge, a valve, and the like. The cleaning device 52 sprays the cleaning liquid onto the polypropylene resin 11 conveyed by the net conveyor 53 to clean the polypropylene resin 11. This cleaning liquid is a liquid having substantially the same components as the processing liquid 12 and is used at about room temperature. In this way, since minute foreign matters (residues such as fillers and solid coatings) adhering to the polypropylene resin 11 can be washed away, the purity (quality) of the recycled polypropylene resin 11 can be improved. Can do.
Further, since the cleaning liquid of the cleaning device 52 is substantially the same component as the processing liquid 12 (usually a processing liquid that does not include a catalyst component), it is possible to prevent problems such as adversely affecting the polypropylene resin 11. Further, for example, the treatment liquid 12 obtained by the evaporator 61 can be used, management of the cleaning liquid becomes easy, and usability can be improved.

The net conveyor 53 has a wire net having a finer mesh than the size of the polypropylene resin 11 to be collected, and conveys and discharges the placed polypropylene resin 11. If it does in this way, the polypropylene resin 11 can be discharged | emitted continuously and the composite 10 can be processed efficiently compared with a batch system.
In addition, the polypropylene resin 11 discharged | emitted from the net conveyor 53 is dried at a separate process later, and is reused as the polypropylene resin 11.

(Processing liquid reuse means)
The processing liquid reuse means 6 includes an evaporator 61 as a residue separation means, a temperature control means 62, a catalyst tank 65, and the like. In the treatment liquid reuse means 6, the evaporator 61 separates the residue from the treatment liquid 12 collected in the collection tank 51, and reuses the treatment liquid 12 from which the residue has been separated.
In addition, although the process liquid reuse means 6 of this embodiment has the catalyst tank 65, it is not limited to this, For example, it is good also as a structure which is not provided with the catalyst tank 65. FIG.

The evaporator 61 communicates with the recovery tank 51 through a filter, a pump, or the like, and a part of the processing liquid 12 recovered in the recovery tank 51 (usually a part, but may be all). .) Is extracted, and the solvent is separated from residues such as fillers and coating film solids through an evaporation step. In addition, normally, the density | concentration of the melt | dissolution substance from composites, such as a coating film in dissolution tank 3a, 3b, 3c, is managed so that it may be 20 wt% or less.
And the solvent isolate | separated by the evaporator 61 is supplied to the dissolution tank 3a as the process liquid 12, and is reused. As a result, running costs can be reduced.
Further, the separated residue is discharged out of the system and reused as auxiliary fuel or the like (for example, equivalent to C heavy oil). Thus, the dissolution treatment apparatus 1 can almost completely reuse the composite 10 and can improve the added value as a treatment apparatus.

The temperature control means 62 includes a cooling heat exchanger 63a, a heating heat exchanger 63b, an automatic control valve 64, and the like.
The cooling heat exchanger 63a communicates with the recovery tank 51 via a valve or the like, and cools a part of the processing liquid 12 recovered in the recovery tank 51 by circulating cooling water. And the cooled process liquid 12 is supplied to the dissolution tank 3a via the catalyst tank 65 as needed.
Further, the heating heat exchanger 63b communicates with the recovery tank 51 through a valve or the like. When the automatic control valve 64 controlled by a temperature sensor or a temperature controller circulates the heat transfer oil, the recovery tank A part of the processing liquid 12 collected in 51 is heated. And the heated process liquid 12 is supplied to the dissolution tank 3a via the catalyst tank 65 as needed.
Therefore, at the time of starting up the apparatus or during normal operation, the treatment liquid 12 having a predetermined temperature can be supplied to the dissolution tank 3a by the heating heat exchanger 63a, and the temperature of the treatment liquid 12 in the dissolution tank 3a can be supplied. Can be stabilized.
Further, at the time of shutdown of the apparatus or in an emergency, the apparatus can be safely stopped by lowering the temperature of the in-system processing solution to a predetermined temperature by the cooling heat exchanger 63b.

In order to efficiently dissolve the polyurethane resin, it is preferable to use the treatment liquid 12 through the catalyst tank 65. The catalyst used in the catalyst tank 65 is an alkali metal phosphate or carbonate, and examples thereof include lithium phosphate, sodium phosphate, potassium phosphate, lithium carbonate, sodium carbonate, and potassium carbonate.
The catalyst tank 65 has substantially the same configuration as a stainless steel cartridge filter, and the above-described catalyst (solid) is housed in a cartridge made of a stainless steel wire mesh. Further, the catalyst tank 65 communicates with the cooling heat exchanger 63a and the heating heat exchanger 63b via the three-way valve 66 and the like, and the processing liquid 12 is supplied when the three-way valve 66 is opened. In the catalyst tank 65, when the processing liquid 12 from the temperature control means 62 circulates in the tank, the active component in the catalyst moves into the processing liquid 12. That is, by using the catalyst tank 65, the active component in the catalyst can be efficiently moved into the treatment liquid 12.

Next, operation | movement of the melt | dissolution processing apparatus 1 of the said structure is demonstrated with reference to drawings.
FIG. 2: has shown the schematic flowchart figure for demonstrating the melt | dissolution processing method concerning one Embodiment of this invention.
As shown in FIG. 2, in the dissolution treatment apparatus 1, first, the net conveyor 21 of the charging unit 2 transports the placed pellet-shaped composite 10. If it does in this way, the composite 10 can be thrown in continuously and the composite 10 can be processed efficiently compared with a batch system.

Next, the cleaning device 22 sprays the cleaning liquid onto the conveyed composite 10 to clean the composite 10. Thereby, the malfunction that a foreign material mixes in the dissolution tank 3a as a dissolution tank means can be prevented. Furthermore, since the pulverized composite 10 is in a wet state (sealed state) with the cleaning liquid, it can be quickly immersed in the processing liquid 12 when it is put into the dissolution tank 3a.
Subsequently, the net conveyor 21 conveys the washed composite 10 to the hopper 23, and the composite 10 dropped from the net conveyor 21 is charged into the dissolution tank 3a via the hopper 23 (step S1).

  Next, in the dissolution tanks 3a, 3b, and 3c of the multistage continuous apparatus, the stirring means 31 stirs the charged composite 10 in the treatment liquid 12, and the polyurethane resin contained in the composite 10 is dissolved (step S2). ). The processing liquid 12 is controlled to about 145 ° C. by the heating means 32 and the cooling means 33. Thus, by having a multistage configuration, the residence time distribution of the treatment liquid 12 and the composite 10 in each of the dissolution tanks 3a, 3b, and 3c can be made uniform. That is, it is possible to prevent a problem that the composite 10 that is continuously fed out from the multistage continuous apparatus in a very short time after being thrown in, and to maintain a predetermined processing time in total. Therefore, it is possible to improve the quality of the recovered polypropylene resin 11 (the problem that the polyurethane resin remains in the polypropylene resin 11 does not occur).

  Further, the dissolution tanks 3a, 3b, 3c are normally in a state in which each valve 34 is opened, and when the treatment liquid 12 is supplied to the dissolution tank 3a, the treatment liquid 12 of the dissolution tank 3a, the composite The product 10 and the polypropylene resin 11 and the like flow into the dissolution tank 3b, the treatment liquid 12 in the dissolution tank 3b, the composite 10 and the polypropylene resin 11 and the like flow into the dissolution tank 3c, and the treatment liquid 12 (dissolved polyurethane resin in the dissolution tank 3c). And polypropylene resin 11 are discharged onto the net conveyor 53 in the collection tank 51.

Next, the recovery / discharge means 5 separates the treatment liquid 12 containing the dissolved polyurethane resin discharged from the dissolution tank 3c and the undissolved polypropylene resin 11, recovers the treatment liquid 12 in the recovery tank 51, and The net conveyor 53 discharges the polypropylene resin 11.
In the treatment liquid 12 collected in the collection tank 51, the filler (the size is very small (maximum length is less than about 1 mm)), the solid coating (exfoliated from the polypropylene resin, but completely dissolved). There are no residues (such as small fine pieces (maximum length less than about 1 mm)).

  Here, the recovery / discharge means 5 is first discharged onto the net conveyor 53 in the recovery tank 51, and the discharged processing liquid 12 and polypropylene resin 11 are processed by the processing liquid 12 or the like through the wire net of the net conveyor 53. It passes through, is stored in the collection tank 51, and the polypropylene resin 11 is placed on the wire net and conveyed by the net conveyor 53. That is, the recovery / discharge unit 5 separates the polypropylene resin 11 from the treatment liquid 12, can easily collect the treatment liquid 12 in the collection tank 51, and continuously collects the separated polypropylene resin 11 (step S31).

Next, the washing | cleaning apparatus 52 sprays a washing | cleaning liquid on the polypropylene resin 11 conveyed by the net conveyor 53, and wash | cleans the polypropylene resin 11 (step S32). This cleaning liquid is a liquid having substantially the same components as the processing liquid 12 and is used at about room temperature. In this way, since minute foreign matters (residues such as fillers and solid coatings) adhering to the polypropylene resin 11 can be washed away, the purity (quality) of the recycled polypropylene resin 11 is improved after recovery. Can be made.
Further, since the cleaning liquid of the cleaning device 52 is substantially the same component as the processing liquid 12 (usually a processing liquid that does not include a catalyst component), it is possible to prevent problems such as adversely affecting the polypropylene resin 11. Further, for example, the treatment liquid 12 obtained by the evaporator 61 can be used, management of the cleaning liquid becomes easy, and usability can be improved.

Subsequently, the net conveyor 53 conveys and discharges the placed polypropylene resin 11 (step S33). If it does in this way, the polypropylene resin 11 can be discharged | emitted continuously and the composite 10 can be processed efficiently compared with a batch system.
Note that the polypropylene resin 11 discharged from the net conveyor 53 to a collection container or the like is dried in a separate process later and reused as the polypropylene resin 11.

Next, in the dissolution treatment apparatus 1, the treatment liquid reuse unit 6 removes the residue of the treatment liquid 12 collected in the collection tank 51 and reuses the treatment liquid 12 from which the residue has been removed (Step S <b> 4).
Here, in the processing liquid reuse means 6, the evaporator 61 extracts a part of the processing liquid 12 recovered in the recovery tank 51 (usually part, but may be all), and Through the evaporation step (step S41), the solvent is separated from residues such as fillers and coating solids.
And the solvent isolate | separated by the evaporator 61 is supplied to the dissolution tank 3a as the process liquid 12, and is reused. As a result, running costs can be reduced.
Further, although not shown, the separated residue is discharged out of the system and reused as auxiliary fuel or the like (for example, equivalent to C heavy oil). Thus, the dissolution treatment apparatus 1 can almost completely reuse the composite 10 and can improve the added value as a treatment apparatus.

  Further, in the processing liquid reuse means 6, the temperature control means 62 controls a part of the processing liquid 12 recovered in the recovery tank 51 to a predetermined temperature (step S42). If it does in this way, the processing liquid 12 of predetermined temperature can be supplied to the dissolution tank 3a, and the temperature of the processing liquid 12 in the dissolution tank 3a can be stabilized.

  Further, when the three-way valve 66 is opened as necessary, the processing liquid reuse means 6 moves the active component in the catalyst into the processing liquid 12 from the temperature control means 62 by the catalyst tank 65, and the processing liquid 12. A catalyst is added to (step S43). That is, by using the catalyst tank 65, the active component in the catalyst can be efficiently moved into the treatment liquid 12.

As described above, the dissolution treatment apparatus 1 is in the dissolution tank means (dissolution tanks 3a, 3b, 3c) even when the composite 10 formed of at least a polyurethane resin and a polypropylene resin is continuously charged. The achievement rate of dissolution can be improved. Furthermore, the quality of the polypropylene resin 11 collect | recovered can be improved because the process liquid reuse means 6 collect | recovers the polypropylene resin 11 continuously, and performs washing | cleaning.
Moreover, compared with a batch system, it can process efficiently by throwing in the composite 10 continuously. Furthermore, since the processing liquid 12 can be reused, the running cost can be reduced.

As described above, according to the dissolution treatment apparatus 1 of the present embodiment, the polyurethane resin is dissolved from the composite 10 formed of at least the polyurethane resin and the polypropylene resin, and the polypropylene resin 11 is recovered. It can be processed efficiently and continuously at a low cost.
Next, other embodiments of the dissolution treatment apparatus 1 will be described with reference to the drawings.

[Second Embodiment of Dissolution Treatment Apparatus for Resin Composite]
FIG. 3: is the schematic of the principal part for demonstrating the dissolution tank means of the dissolution processing apparatus concerning 2nd embodiment of this invention, (a) has shown sectional drawing of the front direction, (b) Shows an AA arrow view.
In FIG. 3, the dissolution treatment apparatus of the present embodiment is different from the dissolution treatment apparatus 1 of the first embodiment described above in that a horizontal multistage tank 41 is provided instead of the dissolution tanks 3 a, 3 b, and 3 c. . In addition, the other structure of this embodiment is as substantially the same as the melt | dissolution processing apparatus 1. FIG.
Therefore, in FIG. 3, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The horizontal multi-stage tank 41 has a substantially rectangular parallelepiped shape having three dissolution tanks adjacent in the horizontal direction, and includes a partition plate 411, an elevating plate 413, a baffle plate 414, a stirring means 31, and the like.
The partition plate 411 is provided at two locations so as to divide the horizontal multi-stage tank 41 into approximately three equal parts, and partitions adjacent dissolution tanks. Further, the partition plate 411 is formed with a substantially rectangular communication hole 412 in the center of the lower portion. The position and shape of the partition plate 411 are not limited to the above, and are set according to, for example, the stirring state of the processing liquid 12 or the composite 10 and the specific gravity of the composite 10 with respect to the processing liquid 12. Is done.

Further, the elevating plate 413 has a substantially rectangular shape, and is provided so as to be able to move up and down so that the communication hole 412 can be closed. The elevating plate 413 is moved up and down by an air cylinder (not shown) or the like to open and close the partition plate 411.
Further, a substantially rectangular baffle plate 414 is erected on the downstream side of the partition plate 411 so as to face the partition plate 411. Further, the position and shape of the baffle plate 414 are set according to, for example, the flow state of the processing liquid 12 and the composite 10.
The horizontal multi-stage tank 41 has a heating means 32 and a cooling means 33, although not shown.

In the horizontal multi-stage tank 41 having the above-described configuration, the pair of elevating plates 413 is normally raised and the valve 34 is opened, and the treatment liquid 12 is supplied to the first dissolution tank (left dissolution tank). Then, due to the potential energy, the treatment liquid 12 of the first dissolution tank, the composite 10 and the polypropylene resin 11 and the like flow into the second dissolution tank (central dissolution tank), and the treatment liquid 12 of the second dissolution tank, The composite 10 and the polypropylene resin 11 and the like flow into the third dissolution tank (the dissolution tank on the right side), and the treatment liquid 12 (including the dissolved polyurethane resin) of the third dissolution tank and the polypropylene resin 11 and the like are collected in the recovery tank. It is discharged onto the net conveyor 53 in 51.
At this time, the baffle plate 414 allows the treatment liquid 12 and the like to flow upward and to the left and right, and thus effectively prevents a problem that the first communication hole 412 and the second communication hole 412 flow almost linearly. can do.
Other configurations are substantially the same as those of the dissolution treatment apparatus 1.
In the present embodiment, the number of tanks is 3, but the number of tanks is not limited to the above. For example, the number of tanks is set according to the treatment liquid 12 or the composite 10.

  As described above, according to the dissolution treatment apparatus 1a of the present embodiment, the same effects as the dissolution treatment apparatus 1 of the first embodiment can be obtained, and the dissolution tank means (horizontal multistage tank 41) can be downsized. I can plan.

[Third embodiment of dissolution treatment apparatus for resin composite]
FIG. 4: has shown schematic sectional drawing of the principal part for demonstrating the dissolution tank means of the dissolution processing apparatus concerning 3rd embodiment of this invention.
In FIG. 4, the dissolution treatment apparatus of the present embodiment is different from the dissolution treatment apparatus 1 of the first embodiment described above in that a vertical multistage tank 42 is provided instead of the dissolution tanks 3 a, 3 b, and 3 c. To do. In addition, the other structure of this embodiment is as substantially the same as the melt | dissolution processing apparatus 1. FIG.
Therefore, in FIG. 4, the same components as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The vertical multistage tank 42 has a substantially cylindrical shape having three dissolution tanks adjacent in the vertical direction, and includes a partition plate 421, a lift plate 423, a stirring means 424, a valve 425, a pump 426, a mixing layer 427, and the like. is doing. In addition, a pipe 36 is connected to the upper part, and the processing liquid 12 and the like overflow.
The partition plate 421 is provided at two locations so as to divide the vertical multi-stage tank 42 into approximately three equal parts, and partitions adjacent dissolution tanks. Further, the partition plate 421 is formed with a substantially circular communication hole 422 at the edge. The number of tanks and the position and shape of the partition plate 421 are not limited to the above, and are set according to, for example, the stirring state of the treatment liquid 12 or the composite 10.

The pair of elevating plates 423 has a substantially circular shape, and is provided so as to be able to move up and down so that the communication hole 422 can be closed. These elevating plates 423 are attached to one connecting rod, and are moved up and down by an air cylinder (not shown) or the like to open and close the partition plate 421. That is, the communication hole 422, the lifting plate 423, and the like function as communication means that allows the dissolution tank to communicate with each other so as to be opened and closed.
Moreover, the stirring means 424 has three impellers, a shaft, a motor, and the like, and stirs the treatment liquid 12 in each dissolution tank.
In the present embodiment, the second communication hole 422 is provided above the first communication hole 422. However, the present invention is not limited to this. For example, the second communication hole 422 is circumferential with respect to the first communication hole 422. The second communication holes 422 may be provided at different positions. By doing so, it is possible to effectively prevent a problem that the first communication hole 422 flows almost linearly to the second communication hole 422.

The vertical multi-stage tank 42 is connected to a pump 426 through a valve 425 and the like, with a valve 425 connected to the center of the lower part.
The pump 426 is normally a positive displacement pump, and the suction port communicates with the mixed layer 427.
The mixed layer 427 is supplied with the composite 10 and the treatment liquid 12.
The vertical multi-stage tank 42 includes a heating means 32 and a cooling means 33, which are not shown.

In the vertical multi-stage tank 42 configured as described above, the composite 10 and the processing liquid 12 are supplied to the mixed layer 427, the pump 426 is activated, and the valve 425 is open. Moreover, the elevating plate 423 is raised and the communication holes 422 are opened.
Thereby, the vertical multistage tank 42 is supplied with the composite 10 and the processing liquid 12 from the first dissolution tank to the second dissolution tank (middle stage) by the pump 426 to the first dissolution tank (lower dissolution tank). Treatment liquid 12, the composite 10 and the polypropylene resin 11 flow into the second dissolution tank, and the treatment liquid 12, the composite 10 and the polypropylene resin flow from the second dissolution tank to the third dissolution tank (the upper dissolution tank). 11 and the like, and the treatment liquid 12 (including the dissolved polyurethane resin) and the polypropylene resin 11 flow from the third dissolution tank to the pipe 36.
At this time, the elevating plate 423 functions as a baffle plate, and the processing liquid 12 and the like flow in the upward direction and the left and right direction, so that the problem is that the first communication hole 422 flows almost linearly. Can be effectively prevented.

Other configurations are substantially the same as those of the dissolution treatment apparatus 1.
Moreover, in this embodiment, although the process liquid 12 etc. are supplied to a 1st dissolution tank using the pump 426, it is not limited to this, For example, the mixing layer 427 is made into a 1st dissolution tank. The treatment liquid 12 and the like may be supplied to the first dissolution tank by using potential energy.
Further, a baffle plate (not shown) may be provided instead of the lifting plate 423.

As described above, according to the dissolution treatment apparatus of the present embodiment, the same effects as the dissolution treatment apparatus 1 of the first embodiment can be obtained, and the dissolution tank means (vertical multistage tank 42) can be downsized and saved. Space can be achieved.
Moreover, this embodiment has various application examples.
Next, application examples of the present embodiment will be described with reference to the drawings.

<Application example of resin compound dissolution treatment equipment>
FIG. 5: has shown schematic sectional drawing of the principal part for demonstrating the dissolution tank means of the continuous dissolution processing apparatus concerning the application example of 3rd embodiment of this invention.
In FIG. 5, the dissolution processing apparatus of this application example is different from the dissolution processing apparatus of the third embodiment described above in that a bypass valve 432, a pipe 433, and the like are provided instead of the lifting plate 423 and the like. Is different. In addition, the other structure of this embodiment is as substantially the same as the melt | dissolution processing apparatus of 3rd embodiment.
Therefore, in FIG. 5, the same components as those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

The vertical multi-stage tank 43 has substantially the same configuration as the vertical multi-stage tank 42, and the partition plate 431 is provided at two locations so as to divide the vertical multi-stage tank 43 into almost three equal parts, and adjacent melting The tank is partitioned.
Adjacent dissolution tanks are communicated with each other by a bypass valve 432, a pipe 433, and the like.
Other configurations and operations are almost the same as those of the dissolution treatment apparatus of the third embodiment.
In this application example, the number of tanks is 3, but the number is not limited to the above. For example, the number of tanks is set according to the treatment liquid 12 or the composite 10.

  Thus, the dissolution treatment apparatus of this application example has substantially the same effect as the dissolution treatment apparatus of the third embodiment, and the structure can be simplified, so that the cost of equipment can be reduced, Maintenance can be improved.

[One Embodiment of Dissolution Treatment Method for Resin Composite]
The present invention is also effective as an invention of a method for dissolving a resin composite.
The resin composite dissolution treatment method of the present embodiment is a method of treating the composite 10 formed of at least a polyurethane resin and a polypropylene resin by using the dissolution treatment apparatus 1 described above.
That is, in the resin composite dissolution treatment method of this embodiment, as shown in FIG. 2, the placed pellet-shaped composite 10 is first transported by the net conveyor 21 of the charging means 2. If it does in this way, the composite 10 can be thrown in continuously and the composite 10 can be processed efficiently compared with a batch system.

Next, the cleaning device 22 sprays the cleaning liquid onto the conveyed composite 10 to clean the composite 10. Thereby, the malfunction that a foreign material mixes in the dissolution tank 3a as a dissolution tank means can be prevented. Furthermore, since the pulverized composite 10 is in a wet state (sealed state) with the cleaning liquid, it can be quickly immersed in the processing liquid 12 when it is put into the dissolution tank 3a.
Subsequently, the cleaned composite 10 is transported to the hopper 23 by the net conveyor 21, and the composite 10 dropped from the net conveyor 21 is put into the dissolution tank 3a via the hopper 23 (step S1).

  Next, the polyurethane resin contained in the composite 10 is dissolved by the dissolution tanks 3a, 3b, and 3c of the multistage continuous device (step S2). In this way, the residence time distribution of the treatment liquid 12 and the composite 10 in each dissolution tank 3a, 3b, 3c can be made uniform, and the quality of the recovered polypropylene resin 11 (polypropylene resin 11 and polyurethane resin 11). Can be improved).

  Next, the recovery / discharge means 5 separates the treatment liquid 12 containing the dissolved polyurethane resin recovered from the dissolution tank 3c from the undissolved polypropylene resin 11, collects the treatment liquid 12 in the recovery tank 51, and The polypropylene resin 11 is discharged (step S3).

  Here, first, the processing liquid 12 and the polypropylene resin 11 and the like discharged onto the net conveyor 53 in the recovery tank 51 pass through the wire net of the net conveyor 53, and are stored in the recovery tank 51, and The polypropylene resin 11 is placed on the wire net and conveyed by the net conveyor 53. That is, the polypropylene resin 11 is separated from the treatment liquid 12 by the collection / discharge means 5, the treatment liquid 12 can be easily collected in the collection tank 51, and the separated polypropylene resin 11 is continuously collected (step S31).

  Next, the cleaning device 52 sprays the cleaning liquid onto the polypropylene resin 11 being transported to clean the polypropylene resin 11 (step S32). In this way, since minute foreign matters (residues such as fillers and solid coatings) adhering to the polypropylene resin 11 can be washed away, the purity (quality) of the recycled polypropylene resin 11 is improved after recovery. Can be made.

  Subsequently, the placed polypropylene resin 11 is conveyed and discharged by the net conveyor 53 (step S33). If it does in this way, the polypropylene resin 11 can be discharged | emitted continuously and the composite 10 can be processed efficiently compared with a batch system.

Next, the residue of the treatment liquid 12 collected in the collection tank 51 is separated by the treatment liquid reuse means 6, and the separated treatment liquid 12 is reused (step S4).
Here, a part of the processing liquid 12 recovered in the recovery tank 51 by the evaporator 61 (usually a part of the processing liquid 12 but may be all) is extracted and passed through an evaporation step (step S41). Separate the solvent from residues such as fillers and solid coatings.
And the solvent isolate | separated by the evaporator 61 is supplied to the dissolution tank 3a as the process liquid 12, and is reused. As a result, running costs can be reduced.
Further, although not shown, the separated residue is discharged out of the system and reused as auxiliary fuel or the like (for example, equivalent to C heavy oil). Thus, the dissolution treatment apparatus 1 can almost completely reuse the composite 10 and can improve the added value as a treatment method.

  Further, the temperature control means 62 controls a part of the processing liquid 12 recovered in the recovery tank 51 to a predetermined temperature (step S42). If it does in this way, the processing liquid 12 of predetermined temperature can be supplied to the dissolution tank 3a, and the temperature of the processing liquid 12 in the dissolution tank 3a can be stabilized.

  Further, if necessary, the catalyst tank 65 moves the active component in the catalyst into the treatment liquid 12 from the temperature control means 62, and the catalyst is added to the treatment liquid 12 (step S43). That is, by using the catalyst tank 65, the active component in the catalyst can be efficiently moved into the treatment liquid 12.

As described above, the dissolution treatment method according to the present embodiment can be performed even when the composite 10 formed of at least a polyurethane resin and a polypropylene resin is continuously charged. The achievement rate of dissolution in 3c) can be improved. Furthermore, the treatment liquid recycling means 6 can continuously improve the quality of the polypropylene resin 11 regenerated after the recovery by continuously recovering and washing the polypropylene resin 11.
Moreover, compared with a batch system, it can process efficiently by throwing in the composite 10 continuously. Furthermore, since the treatment liquid 12 can be reused, the running cost can be reduced.

  As described above, according to the dissolution treatment method of this embodiment, the polyurethane resin is dissolved from the composite 10 formed of at least the polyurethane resin and the polypropylene resin, and the polypropylene resin 11 is recovered, thereby reducing the cost. Can be processed efficiently and continuously.

The resin composite dissolution treatment apparatus and the resin composite dissolution treatment method of the present invention have been described with reference to the preferred embodiments. The resin composite dissolution treatment apparatus and the resin according to the present invention have been described above. It is needless to say that the dissolution treatment method of the composite is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention.
For example, the dissolution treatment apparatus 1 is configured to be supplied with the pulverized composite 10, but is not limited thereto, and for example, the charging unit 2 may include a pulverizing unit (not shown). Good. In this way, the added value of the dissolution treatment apparatus 1 can be improved.

1 Dissolution treatment device 2 Input means
3a, 3b, 3c dissolution tank
5 Collecting and discharging means
6 Treatment Solution Reuse Means 10 Composite 11 Polypropylene Resin
12 Treatment liquid
21 Net conveyor
22 Cleaning device
23 Hopper
31 Stirring means
32 Heating means
33 Cooling means
34 valves
35 Piping
36 Piping 41 Horizontal multi-stage tank
42 Vertical multi-stage tank
43 Vertical multi-stage tank 51 Recovery tank 52 Cleaning device 53 Net conveyor 61 Evaporator
62 Temperature control means
63a Heat exchanger for cooling
63b Heat exchanger for heating
64 Automatic control valve
65 Catalyst tank
66 Three-way valve 411 Partition plate 412 Communication hole 413 Lift plate 414 Baffle plate 421 Partition plate 422 Communication hole 423 Lift plate 424 Stirring means 425 Valve 426 Pump 427 Mixing layer 431 Partition plate 432 Valve 433 Piping

Claims (11)

In a dissolution treatment apparatus for a resin composite formed of at least a polyurethane resin and a polypropylene resin,
A charging means for charging the resin composite;
A treatment liquid for dissolving the polyurethane resin of the charged resin composite is stored, and a dissolution tank means having a multi-stage configuration;
Separating the treatment liquid containing the dissolved polyurethane resin discharged from the dissolution tank means and the undissolved polypropylene resin, collecting the treatment liquid, and collecting and discharging means for discharging the polypropylene resin;
A resin composite dissolution treatment apparatus comprising: a residue separation means for separating a residue from the collected treatment liquid; and a treatment liquid reuse means for reusing the treatment liquid.   2. The resin compound dissolution treatment apparatus according to claim 1, wherein the treatment liquid contains alcohols, ketones or ethers.   The resin compound dissolution treatment apparatus according to claim 1, wherein the charging unit includes a net conveyor and a cleaning device.   The said dissolution tank means is a multi-tank continuous apparatus, and the some dissolution tank of the said multi-tank continuous apparatus has a stirring means, a heating means, and a cooling means, It is any one of Claims 1-3 characterized by the above-mentioned. The resin compound dissolution treatment apparatus described in 1.   The dissolution tank means is a horizontal multi-stage tank, a partition plate formed with communication holes for partitioning adjacent dissolution tanks, a lifting plate for opening and closing the communication holes, a baffle plate provided on the downstream side of the communication holes, and stirring means The resin composite dissolution treatment apparatus according to claim 1, further comprising a heating unit and a cooling unit.   The dissolution tank means is a vertical multistage tank, and has a partition plate that partitions adjacent dissolution tanks, a communication means that allows the adjacent dissolution tanks to be opened and closed, an agitation means, a heating means, and a cooling means. The resin compound dissolution treatment apparatus according to any one of claims 1 to 3.   The said compounding / discharging means has a collection tank, a net conveyor, and a washing | cleaning apparatus, The melt processing apparatus of the resin composite as described in any one of Claims 1-6 characterized by the above-mentioned.   The resin compound dissolution treatment apparatus according to claim 1, wherein the treatment liquid reuse unit includes a temperature control unit.   The said process liquid reuse means has a catalyst tank, The catalyst used with the said catalyst tank is a phosphate or carbonate of an alkali metal, It is any one of Claims 1-8 characterized by the above-mentioned. The resin compound dissolution treatment apparatus described.   The resin compound dissolution treatment apparatus according to any one of claims 1 to 9, wherein the residue separation means of the treatment liquid reuse means is an evaporator. In a method for dissolving a resin composite formed of at least a polyurethane resin and a polypropylene resin,
A charging step of charging the resin composite;
Using a treatment liquid stored in a dissolution tank means having a multistage configuration, a dissolution step of dissolving the polyurethane resin of the charged resin composite,
Separating the treatment liquid containing the dissolved polyurethane resin discharged from the dissolution tank means and the undissolved polypropylene resin, recovering the treatment liquid, and discharging and discharging the polypropylene resin;
And a treatment liquid recycling step of separating the residue from the collected treatment liquid and reusing the treatment liquid.

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