JP3515011B2 - Decomposition device for foamed resin - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating a waste refrigerator, and more particularly to an apparatus and method for decomposing a foamed resin containing an organic halide in a urethane foam resin used as a heat insulating material.

[0002]

2. Description of the Related Art Urethane foam resin is used as a heat insulating material in waste refrigerators among household electric appliances, and as a foaming agent for this foam resin, CFC-11, CFC-12 or other CFCs have been used as a foaming agent. (Organic halides) have been mainly used. As a result, when landfilling a waste home electric appliance containing such a foamed urethane resin containing freon as a constituent material, there is a risk that freon will be released into the atmosphere over time.

Therefore, in the treatment of a refrigerator having a foamed urethane resin containing such a CFC or a CFC substitute as a constituent material, a technique of thermally decomposing the foamed urethane or recovering the foaming agent by finely pulverizing it has been mainly used. It was

According to such a treatment method, although the foaming agent is recovered, the urethane foam resin is deteriorated by thermal decomposition and the like, and cannot be recycled, and it is landfilled as shredder dust or the like, or even if recovered, it is oil. Therefore, it could not be directly recycled to the original urethane resin raw material.

[0005]

The conventional urethane resin recovery device cannot recover directly to the raw material of the urethane resin because it recovers as a recycled product such as oil. The present invention has been made in view of the above problems, and an object of the present invention is to provide an apparatus and method for decomposing a foamed resin that efficiently recovers resources from a waste foamed resin as a foamed resin raw material such as a polyol.

[0006]

The decomposition device of the present invention comprises at least a raw material supply section to which a urethane foam resin is supplied , and at least a member for promoting a decomposition reaction of the urethane foam resin.
A compound having two isocyanate-reactive hydrogen atoms,
Selected from amines, organometallic compounds, and alkalis
Is a decomposing agent injection unit for injecting at least one or more decomposers, the urethane foam resin and then kneading the said decomposing agent before with promoting the decomposition reaction of the urethane foam resin
Characterized by comprising the extruder to transport serial urethane resin to the downstream side, and a de-揮部to the extruder is arranged downstream of the extruder removing and recovering blowing agent in the foamed urethane resin And

[0007] Before Symbol extruder, using a twin-screw extruder has two screws are rotatably inserted into the inner cylinder
You can

The devolatilization section should have suction means.
Is preferred.

[0009] onset the steps of kneading the urethane foam resin and the decomposition agent containing in a sealed container foams, and a step of promoting the decomposition reaction of the foamed resin by heating the sealed container, the from the closed container A decomposing method including a step of devolatilizing and separating the foaming agent can be adopted.

In the decomposition method, it is preferable that the decomposition agent is at least one substance selected from compounds having at least two isocyanate-reactive hydrogen atoms, amines, organometallic compounds, and alkalis. .

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is a method and an apparatus for recovering a foaming agent from a urethane foam resin of a refrigerator, which is for removing and recovering the foaming agent from the urethane foam resin in one twin-screw extruder. It is characterized in that it has a vent port, and has a reaction accelerating part for decomposing into a polyol of a urethane resin raw material by mixing and kneading a urethane foam resin and a decomposing agent.

The apparatus of the present invention is shown in FIG. 1
Is a waste resin input port, and 3 is a raw material input port as a raw material supply unit. Further, a decomposing agent tank 4, a liquid injecting pump 5, and a decomposing agent injecting port 6 are provided as a decomposing agent injecting section. The closed container 2 as a reaction promoting unit is integrated with a twin-screw extruder as an extruding means. The devolatilizing section is composed of a vent 7, a condenser 8 and a vacuum pump 9. Reference numeral 10 is a discharge nozzle.

The apparatus of the present invention is one of recovering a foaming agent such as freon from the urethane foam resin of the refrigerator, and making a chemical decomposition product from the urethane foam resin into a renewable polyol as a urethane resin raw material. It is possible to do it in one step with the device.

As the foaming urethane resin of the refrigerator which is the subject of the present invention, as a constituent of the foaming agent, a compound in which a part or all of hydrogen of a hydrocarbon compound is replaced by a halogen element such as chlorine or fluorine is used. , Especially aliphatic organic halides (specific CFCs, alternative CFCs, etc.), but hydrocarbon compounds that have been used in recent years (butane, pentane, etc.), carbon dioxide from water formulations, etc. is not.

Further, examples of the compound having at least two isocyanate-reactive hydrogen atoms include polyhydric alcohols, and any mixture of alcohols of this type can be used. For example, dihydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, trimethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, polyoxyethylene glycol and polyoxypropylene glycol, Examples thereof include trihydric alcohols such as glycerin, and polymers such as polyethylene glycol.

Among the decomposers, the additives include amines, organometallic compounds and alkali compounds,
These can be used alone or as a mixture of two or more kinds. For example, ethylenediamine, tributylamine, tetramethylenediamine, hexamethylenediamine, tetramethylhexamethylenediamine, pentamethyldiethylenetriamine, triethylenediamine, imidazole, pyridine, amines such as piperazine, dibutyltin dilaurate, dibutyltin diacetylate, dimethyltin mercapto. Examples thereof include organic metal compounds such as tide, and alkali compounds such as potassium hydroxide and sodium hydroxide.

In the above decomposition reaction, the extruder, which is a closed container, is heated to bring the internal reaction temperature to 120 ° C. to 250 ° C., preferably 140 ° C. to 200 ° C., thereby promoting the glycol decomposition of the urethane foam resin to foam. The agent can be easily discharged, and the foaming agent can be efficiently collected.

[0018]

The present invention will be described in detail below with reference to examples. (Example 1) <Decomposition of urethane foam resin> The cylinder temperature of the extruder 2 which is a closed container was set to 160 ° C., and the crushed material of the urethane foam resin recovered in the refrigerator was put into the raw material inlet 1 at 1 kg / h to decompose it. Liquid injection port 6 with a mixture of polyethylene glycol 400 / glycerin (mixing ratio 7/3) and dibutyltin dilaurate (mixing ratio 100/5) at 10 kg / h
Supplied by the pump 5. The foaming agent was removed from the processed product thus formed by the vacuum pump 9 connected to the vent port 7, condensed and recovered from the condenser 8, and a decomposition product was obtained from the extraction port 10. The decomposition product was a polyol having a residue rate of 14% and an OH value of 630 KOHmg / g.

<Regeneration of Decomposition Products> Liquid A: Decomposition product polyol 20 g Foam stabilizer 0.4 g Water 0.4 g Liquid B: MDI 36 g A liquid is well mixed with stirring, and liquid B is added and stirred. Put in a mold and let it foam cure. When left for one day at room temperature, urethane foam having a density of 100 kg / m ³ and a foaming ratio of 10 times was produced. According to the present embodiment, with the above configuration, when the foaming resin is chemically decomposed and the foaming agent is separated from the treated product by demolding, the foaming resin raw material such as polyol can be retained, separated and collected. . Further, regarding the collection of the foaming agent, the foaming agent was physically crushed to collect the foaming agent, so that the residue was left unremoved, but since it is chemically decomposed and collected, the collection rate of the foaming agent is increased. I was able to.

(Example 2) <Decomposition of urethane foam resin> In the description of the following examples,
Descriptions of the same parts and the same steps as those in the first embodiment will be omitted.

First, the cylinder temperature of the extruder 2 is set to 160.
Set the temperature to ℃, and collect 3 pieces of crushed urethane foam resin collected in the refrigerator.
The mixture was put into the raw material inlet 1 at a rate of kg / h, and the mixture of the decomposing agent polyethylene glycol 400 / glycerin (mixing ratio 7/3) and tetramethylethylenediamine (mixing ratio 100 /
5) is supplied at 10 kg / h from the liquid injection port 6 by the pump 5, and in the process of decomposing the urethane foam resin, the foaming agent is removed by the vacuum pump 9 connected to the vent port 7 and condensed (8). When recovered, a decomposition product was obtained from the outlet 10. Decomposition products are 20% residue, OH number 450KOH
It was a mg / g polyol.

<Regeneration of Decomposition Products> Liquid A: decomposition product polyol 20 g catalyst 0.2 g foam stabilizer 0.4 g water 0.6 g liquid B: MDI 30 g liquid A is thoroughly stirred and mixed, and liquid B is added to it. After further stirring, the mixture is placed in a mold and foam-cured. When left at room temperature for 1 day, urethane foam having a density of 67 kg / m ³ and a foaming ratio of 15 times was produced.

(Example 3) <Decomposition of urethane foam resin> The cylinder temperature of the extruder 2 was set to 160 ° C., and the crushed material of the urethane foam resin recovered in the refrigerator was put into the raw material inlet 1 at 5 kg / h, and the decomposition agent was added. Polyethylene glycol 400 / glycerin (mixing ratio 7/3)
And a mixture of dibutyltin dilaurate (mixing ratio 100
/ 5) at a rate of 10 kg / h from the liquid injection port 6 by the pump 5, and in the process of decomposing the urethane foam resin, the vent port 7
The foaming agent was removed by a vacuum pump 9 connected to the condenser, condensed (8) and recovered, and a decomposition product was obtained from the outlet 10. Decomposition product is 20% residue rate, OH number 410KOH
It was a mg / g polyol.

<Regeneration of Degradation Products> Liquid A: Degradation product polyol 20 g Foam stabilizer 0.4 g Water 0.4 g Liquid B: MDI 32 g Liquid A is thoroughly stirred and mixed, and liquid B is added and stirred. Put in a mold and let it foam cure. When left for one day at room temperature, urethane foam having a density of 83 kg / m ³ and a foaming ratio of 12 times was produced.

[0025]

With the above construction, the foaming agent can be recovered by leaving the foaming resin raw material such as the polyol by devolatilizing and separating the foaming agent from the treated product generated when the foaming resin is chemically decomposed. .

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an entire recovery device according to an embodiment of the present invention.

[Explanation of symbols]

1 input port 2 extruder 3 Raw material inlet 4 Decomposing agent tank 5 Liquid injection pump 6 Decomposing agent inlet 7 Vent port 8 condenser 9 Vacuum pump 10 discharge nozzles

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-51-52478 (JP, A) JP-A-52-142783 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C08J 11/00-11/28 B29B 17/00-17/02 B09B 3/00-5/00

Claims (3)

(57) [Claims] 1. A and the raw material supply section foamed urethane resin is supplied in order to promote the decomposition reaction of the urethane foam resin
Of at least two isocyanate-reactive hydrogen atoms
Compounds, amines, organometallic compounds, and
And a decomposing agent injecting section for injecting at least one or more decomposing agent selected from the group (1 ) and (2) to promote the decomposition reaction of the urethane foam resin by kneading the urethane foam resin and the decomposing agent together with the urethane resin. Transport downstream
An apparatus for decomposing a foamed resin, comprising: an extruder; and a devolatilizing section arranged downstream of the extruder for removing and recovering a foaming agent of the urethane foam resin. 2. The apparatus for decomposing a foamed resin according to claim 1, wherein the extruder is a twin-screw extruder in which two screws are rotatably inserted inside a cylinder. 3. The apparatus for decomposing a foamed resin according to claim 1 , wherein the pushing means has a suction means .