KR101999298B1 - Method of Producing Rigid Polyurethane Foams using Recycled Polyurethane Foam Scraps - Google Patents

Abstract

Provided is a method for manufacturing a rigid polyurethane foam. According to the present invention, a rigid waste polyurethane foam is collected to be treated in a depolymerization scheme so as to obtain a regenerated polyol, and a new polyol and the regenerated polyol are mixed. The new polyol and the regenerated polyol is mixed in a weight ratio of 40 to 60 : 60 to 40 to obtain a mixed polyol. Also, 6 to 12 parts by weight of imine polyol is mixed with respect to 100 parts by weight of the mixed polyol, and then, an additive and an isocyanate raw material are introduced thereto in a conventional scheme. In addition, an urethane reaction is performed. According to the present invention, the final thickness of a finally obtained urethane foam product can be adjusted by using reaction heat generated during the urethane reaction and reducing a foaming pressure excessively generated during the urethane reaction by the imine polyol which is decomposed at a high reaction temperature.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for producing a rigid polyurethane, which recycles polyurethane foam scraps,

The present invention relates to a method of producing a rigid polyurethane foam, and more particularly, to a method of manufacturing a rigid polyurethane foam by chemically recycling a polyurethane foam scrap that has been widely used as a refrigerator insulation material, a thermal insulation material for building, And a method for producing a rigid polyurethane foam capable of sufficiently satisfying dimensional stability.

Generally, polyurethane foams can be made of flexible polyurethane foams and rigid polyurethane foams, depending on the properties of the materials being produced.

The rigid polyurethane foam is widely used as a heat insulating material for a refrigerator, a heat insulating material for a building, and the like because the polyol reacts with a polyisocyanate to form a macromolecule to be cured and has excellent heat insulation, heat resistance and flame retardancy after curing of the resin.

On the other hand, even in the case of a refrigerator, it is reported that the amount of polyurethane waste in Korea is about 20,000 tons / year, but it is not recycled and all of the waste is incinerated. If the waste is recycled, resource saving, It can greatly contribute to reduction of air pollutant emission. The incineration of collected waste polyurethane foam causes hydrogen cyanide (HCN) gas to cause toxicity and corrosiveness problems, so that the post-treatment of waste polyurethane is a serious problem to be solved in terms of environmental pollution It is a fact that it is emerging.

Recognizing this problem, the inventors of the present invention have developed a technology for recycling waste polyurethane foam collected from a disposable refrigerator or the like, and have obtained a lot of patent rights. For example, Korean Patent Registration No. 10-1207370 (registered on November 27, 2012), Korean Patent Registration No. 10-1164382 (Registered on July 3, 2012) and Korean Patent Registration No. 10-1298525 Registered on August 14, 2013).

In the case of Korean Patent No. 10-1164382, there is an advantage that the waste polyurethane foam is recycled and has excellent dimensional stability, high heat resistance and excellent heat insulation. Compared to polyurethane foam products using only pure polyol raw materials (PPG, Polyester Polyol), these advantages are remarkably superior to those of recycled products of waste polyurethane foam in heat insulation, compressive strength, dimensional stability, flame retardancy and economical efficiency , And it is confirmed in the fact that it acknowledges it in the industrial field.

Nevertheless, the technology of recycling the waste polyurethane foam of Korean Patent Registration No. 10-1164382 has suffered from difficulties in accurately matching the dimensions of products required in the industrial field.

In order to overcome the disadvantages of the prior art, the inventors of the present invention have found that, while taking various experiments and measures, the present inventors have found that an imine polyol which causes a metathesis reaction due to high temperature heat generated in a urethane reaction process, The present invention has been accomplished by obtaining a technique capable of precisely adjusting the thickness dimension of the polyurethane foam.

Korean Patent Registration No. 10-1207370 (Registered on Nov. 27, 2012); Korean Patent Registration No. 10-1164382 (Registered on July 3, 2012); Korean Patent Registration No. 10-1298525 (Registered on August 14, 2013)

The present invention relates to a method for recycling and using rigid polyurethane foam in which recycled polyurethane foam scrap can be recycled and the conventional manufacturing equipment can be mechanically adjusted or modified without using any conventional manufacturing equipment, The present invention provides a method for producing a rigid polyurethane foam which is high in dimensional stability of a foam and can sufficiently satisfy a thickness standard used in an industrial field.

The present invention is characterized by using an imine polyol which causes a metathesis reaction at a temperature of 120 ° C or higher in a polyurethane production method for collecting and recycling hardly waste polyurethane foam.

More specifically, the present invention relates to a method for producing a polyurethane foam using a recycled polyol obtained by collecting a lightly discolored polyurethane foam and treating it with a depolymerization method to obtain a recycled polyol, 6 parts by weight to 12 parts by weight of an imine polyol are mixed with 100 parts by weight of the compound, and then the additive and isocyanate necessary for the urethane reaction are charged and the urethane reaction is preferably carried out.

The present invention utilizes the fact that the bond between the imine bonds causes a metathesis reaction when the imine polyol reaches a temperature of 120 ° C or higher.

In the urethane reaction, an exothermic reaction is accompanied by the result that the internal temperature of the reactant reaches approximately 120 ° C. to 140 ° C. In this process, the imine polyol undergoes a metathesis reaction and is exchanged with the surrounding urethane reactants The structure of the foam becomes finer and the foaming pressure by the foaming agent is lowered.

In the urethane reaction, microbubbles are generated due to foaming by the foaming agent at the same time as the exothermic reaction, and the microbubbles are made finer than the initial ones by the metathesis reaction of the imine polyol, whereby the foaming pressure And as a result, the thickness of the final product can be adjusted.

The present invention can utilize the conventional belt conveyor device and can proceed the urethane reaction without adjusting the gap between the upper steel plate belt and the lower steel plate belt, and after the stabilization step of the final product, Can be supplied.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of a reaction scheme illustrating a preferred process for preparing an imine polyol used in the present invention,
FIG. 2 is an illustration of a state in which the metathesis reaction of the imine polyol used in the present invention reacts with the macromolecules of the urethane chain existing in the vicinity of the urethane reaction.

Hereinafter, the present invention will be described in more detail and in detail. It is apparent that the present invention is not limited to the specific numerical values or concrete examples provided by the present invention, but is only for the purpose of illustrating the technical idea of the present invention in more detail as a preferred embodiment of the present invention.

Further, in the specification of the present invention, a detailed description will be omitted of parts that are well known in the technical field and can be easily created by a person having ordinary skill in the art. The same reference numerals are used for the same parts.

The present invention is characterized by using an imine polyol which causes a metathesis reaction at a temperature of 120 ° C or higher in a polyurethane production method for collecting and recycling hardly waste polyurethane foam.

The present invention relates to a method for preparing a polyurethane foam by using a recycled polyol to obtain a recycled polyol by treating the waste polyurethane foam recovered from a refrigerator or the like with a depolymerization method, It is believed that the technology used does not exist.

The imine polyol used in the present invention can be prepared by reacting vanillin with an amine compound.

1 shows an illustrative method for preparing an imine polyol that can be used in the present invention.

In the present invention, the reason for using the imine polyol is as follows.

The imine polyol used in the present invention has a characteristic of performing a chemical bond exchange reaction within a specific temperature range. The present invention is to utilize this characteristic of an imine polyol. In other words, the imine polyol undergoes a metathesis reaction at a temperature of 120 ° C. or higher at a temperature of 120 ° C. or higher, and the imine polyol undergoes an exchange reaction with other substances in the vicinity through metathesis reaction. In the present invention, And the reaction proceeds with exchange reactions with the macromolecules of the various urethane chain complexes present in the surroundings.

FIG. 2 is a graph showing that the imine polyol used in the present invention is a urethane chain present in the periphery (in FIG. 2, R1, R2, R3 and R4 are macromolecules containing a urethane bond, , Which is a schematic representation of the phenomenon of exchange reaction by metathesis reaction.

In addition, the imine polyol used in the present invention is further degraded by heat at high temperature generated during the urethane reaction. By this metathesis reaction, the minute bubbles become finer than the initial one, and the foam increases in modulus And consequently, the foaming pressure is lowered.

Generally, when a polyol and an isocyanate are bonded to each other to cause a urethane reaction, an exothermic reaction is accompanied. As a result, the internal temperature of the reactant reaches about 120 to 140 ° C. In this process, microcells, thereby forming a foam foam.

At this time, the imino polyol maintains a generally stable state, and when the temperature of the urethane reaction product rises due to the urethane reaction and reaches a temperature of 120 캜, a metathesis reaction is caused and the modulus increases, The foaming pressure is suppressed. More specifically, when the internal temperature of the urethane reactant reaches about 120 ° C. to 140 ° C., the imine polyol undergoes a metathesis reaction, and the blowing agent expands at the temperature to form fine bubbles in the urethane reaction product cell is increased by increasing the foaming pressure. In this process, the foaming pressure by the foaming agent is lowered by the metathesis reaction of the imine polyol.

In the present invention, 6 parts by weight to 12 parts by weight of an imine polyol is preferably mixed with 100 parts by weight of the polyol compound containing the recycled polyol. When the imine polyol is added in an amount of 6 parts by weight or less based on 100 parts by weight of the polyol compound, the foam suppressing effect by the modulus is so low that the foaming pressure of the actual product is high. As a result, On the other hand, when the polyol compound is added in an amount of more than 12 parts by weight based on 100 parts by weight of the polyol compound, the effect of suppressing the foaming by the modulus is high. As a result, It is not preferable because there is a fear of lowering.

In the present invention, the above-mentioned imine polyol is prepared and used in a self-contained manner, but the present invention is not limited thereto, and it is not excluded that the imine polyol is purchased and used from the outside.

In the present invention, 6 to 12 parts by weight of an imine polyol are mixed with 100 parts by weight of a polyol compound containing the recycled polyol, then the additive and isocyanate necessary for the urethane reaction are introduced, and the urethane reaction is carried out by a conventional procedure desirable.

Hereinafter, the present invention will be described in more detail.

The present invention collects waste polyurethane foam to obtain a regenerated polyol, and the regenerated polyol is mixed with a new polyol to prepare a polyol compound.

In the present invention, it is preferable to use the technique of the prior Korean Patent Registration No. 10-1164382 by the inventors of the present invention to obtain the regenerated polyol. According to this method, 10 to 90 parts by weight of monoethanolamine, diethanolamine, ethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine and 10 to 90 parts by weight of the following formula Amine is reacted at 170 DEG C for 5 to 6 hours to obtain a depolymerized reaction product having an amine active hydrogen equivalent of 105 to 124 g / equivalent by KS M 3829 method, and 5 to 95 wt% Ethylene oxide, and propylene oxide is subjected to an addition reaction to obtain a regenerated polyol.

NH ₂ (CH ₂ CHCH ₃ O) _m CHCH ₃ NH ₂ - - -

[Wherein m = 2.5 and 6.1 in the above formula (1)

The alkylene oxide used in the addition reaction may be specifically ethylene oxide or propylene oxide and mixtures thereof. The addition ratio is 5 parts by weight to 95 parts by weight, relative to 100 parts by weight of the depolymerization reaction product, of alkylene oxide . If the addition amount of the alkylene oxide is less than 5 parts by weight, the amine group contained in the depolymerization can not be sufficiently converted into the hydroxyl group. If the addition amount exceeds 95 parts by weight, And the foam made of such a polyol has a disadvantage that the dimensional stability is poor. When all of the amine groups in the depolymerization reaction product are modified with primary and secondary hydroxyl groups, a regenerated polyol is obtained.

The present invention obtains a polyol compound by mixing the regenerated polyol obtained in the above-described manner with a novel polyol. It is preferable that the polyol compound is obtained by mixing a new polyol and a regenerated polyol, wherein the new polyol: regenerated polyol is mixed at a weight ratio of 40 to 60: 60 to 40.

When the recycled polyol is used as it is, the quality of the final product is characterized by its flame retardancy, heat resistance, dimensional stability, and the like to be very good as compared with a product produced by using a new polyol. However, since the dimensional stability is so good that the thickness of the product that is fresh from the belt conveyor device is maintained at almost the same level even when a day or two has passed since then, the thickness of the final product is required in the industrial field , The polyol raw material composed solely of the recycled polyol is undesirable. For example, if a conventional belt conveyor device has a thickness of 108 millimeters, the thickness of the product may be maintained in the range of 106 millimeters to 107 millimeters over a day or two, It follows.

It is preferable that the novel polyol and the recycled polyol are mixed and used in the present invention, and the new polyol and the recycled polyol are mixed at a ratio of 40 to 60 parts by weight and 60 to 40 parts by weight, respectively. When the regenerated polyol is used in an amount of not more than 40 parts by weight, it is not necessary to specially adjust the thickness of the final product. Further, the amount of the regenerated polyol is not preferable because the amount of the regenerated polyol is small. , The amount of the recycled polyol to be added is relatively large, but the amount of the chemical to be added is relatively large, which is not preferable from the economical point of view.

In the present invention, 6 parts by weight to 12 parts by weight of an imine polyol are mixed with 100 parts by weight of the polyol compound, and the additive and isocyanate used in the urethane production process are added thereto and kneaded at a high speed. In the urethane reaction process, it is preferable to cause a metathesis reaction by the imine polyol to lower the foaming pressure by the foaming agent.

In the present invention, the reason why the imino polyol is used is to lower the foaming pressure by the foaming agent in the urethane reaction, and the specific reason for the use ratio has already been described in detail above, so it will not be repeated.

The present invention then enters the additive and isocyanate feedstock in a conventional manner and proceeds with the urethane reaction. The polyol mixture, the additive used in the polyurethane production process and isocyanate are mixed at a high speed and then put into a belt conveyor apparatus to proceed the urethane reaction.

Hereinafter, the present invention will be described in more detail with reference to examples.

The features and other advantages of the present invention will become more apparent from the following examples. It is to be understood, however, that the present invention is not limited to the following examples.

≪ Preparation of recycled polyol &

[Example 1]

The polyurethane foam collected from the insulator of the refrigerator was pulverized to a size of about 30 mm, and 10 kg of the polyurethane foam was put into the reactor, and 4 kg of monoethanolamine was added for chemical decomposition. 36 liters of nitrogen gas was injected into the reactor and the temperature of the reactor was raised to 170 ° C under a nitrogen atmosphere and the reaction was carried out with stirring for 6 hours. As a result, polyurethane foam scraps were chemically reacted to obtain 10 kg of a compound having a homogeneous liquid amine terminal group lost. 8 kg of the reaction product was placed in a high-pressure reactor, 16 kg of propylene oxide was added over 3 hours, and after aging for 8 hours, 78 kg of brown viscous regenerated polyol was obtained.

≪ Preparation of mixed polyol &

[Example 2]

40 kg of the regenerated polyol according to Example 1 and 60 kg of the new polyol were mixed and 100 kg of the mixed polyol was prepared and stored for the next use.

[Example 3]

50 kg of the regenerated polyol according to Example 1 and 50 kg of the new polyol were mixed and 100 kg of the mixed polyol was prepared and stored for the next use.

[Example 4]

60 kg of the regenerated polyol according to Example 1 and 40 kg of the new polyol were mixed and 100 kg of the mixed polyol was prepared and stored for the next use.

≪ Preparation of imine polyol &

[Example 5]

In order to prepare an imine polyol, 152.2 kg of vanillin and 115.0 kg of amine (trade name: Jeffamine D-230) were put into a field pilot reactor and heated to 80 DEG C with stirring while the heating medium boiler was operated . While maintaining the temperature at 80 캜, the resulting condensed water was removed under reduced pressure using a vacuum pump, and 231.2 kg of bivalent imine polyol was prepared.

<When new polyol is used, foaming pressure and thickness of final product>

[Comparative Example 1]

In order to obtain data comparing the technical characteristics of the present invention by measuring the foaming pressure during the polyurethane reaction conducted in a conventional manner and measuring the thickness of the final product, 100% of the new polyol was used.

To this end, 100 kg of new polyol (PPG), 2 kg of foam stabilizer DC-193, 10 kg of flame retardant TCPP, 1 kg of catalyst PC-5 and 5 kg of water as blowing agent and 13 kg of cyclopentane were blended first 120 kg of MDI were mixed and then mixed at high speed. The mixed solution was poured into a belt conveyor device, the foaming pressure was measured, the final product was obtained, and the final product after 48 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.16 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor device was 103 mm, and the thickness of the product after 48 hours was 100 mm.

At this time, since the foaming pressure is directly related to the thickness of the product, it is advantageous to indirectly predict the thickness of the final product by measuring foaming pressure during urethane reaction.

&Lt; Foaming pressure and thickness of final product when mixed polyol is used >

[Comparative Example 2]

A mixed polyol prepared by mixing a regenerated polyol and a new polyol in the manner of Example 2 was used.

100 kg of the mixed polyol, 2 kg of the foam stabilizer DC-193, 10 kg of the flame retardant TCPP, 1 kg of the catalyst PC-5, and 5 kg of water as the foaming agent and 13 kg of cyclopentane were first blended and mixed with 120 kg of MDI Next, mixing was performed at high speed. The mixed solution was poured into a belt conveyor device, the foaming pressure was measured, the final product was obtained, and the final product after 48 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.25 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor device was 103 mm, and the thickness of the product after 48 hours was 102 mm.

[Comparative Example 3]

A mixed polyol prepared by mixing a regenerated polyol and a new polyol was used in the manner of Example 3 above.

Thereafter, the same components and ratios as in Comparative Example 2 were mixed to cause a urethane reaction, and a foaming pressure was measured. A final product was obtained, and a final product after 48 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.36 kgf / cm &lt; 2 &gt;, the thickness of the product measured after passing through the belt conveyor apparatus was 106 millimeters, and the thickness of the product after 48 hours was 104 millimeters.

[Comparative Example 4]

A mixed polyol prepared by mixing a regenerated polyol and a new polyol in the manner of Example 4 was used.

Thereafter, the same components and ratios as in Comparative Example 2 were mixed to cause a urethane reaction, and a foaming pressure was measured. A final product was obtained, and a final product after 48 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.37 kgf / cm &lt; 2 &gt;, the thickness of the product measured after passing through the belt conveyor device was 107 millimeters, and the thickness of the product after 48 hours was 105 millimeters.

 According to Comparative Examples 2 to 4, the foaming pressure at the time of urethane reaction is significantly higher than that at normal foaming, and the thickness of the resulting product is relatively thick after that. On the other hand, , The dimensional stability is excellent, but it can be seen that the thickness is considerably larger than the dimension required in the industrial field (100 mm).

&Lt; When the modified polyol is used, the foaming pressure and the thickness of the final product &

[Comparative Example 5]

49 kg of the regenerated polyol according to Example 1 and 49 kg of the new polyol were mixed to prepare 98 kg of a mixed polyol. Then, 2 kg of the imine polyol according to Example 5 was mixed to prepare 100 kg of the modified polyol.

2 kg of the foam stabilizer DC-193, 10 kg of the flame retardant TCPP, 1 kg of the catalyst PC-5, and 5 kg of water as the blowing agent and 13 kg of cyclopentane were first blended with 100 kg of the modified polyol, and 120 kg of MDI Mixed, and then mixed at high speed. The mixed solution was poured into a belt conveyor device, the foaming pressure was measured, the final product was obtained, and the final product after 48 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.29 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor device was 106 mm, and the thickness of the product after 24 hours was 104 mm.

[Comparative Example 6]

48 kg of the regenerated polyol according to Example 1 and 48 kg of the new polyol were mixed to prepare 96 kg of a mixed polyol and then 4 kg of the imine polyol according to Example 5 was mixed to prepare 100 kg of a modified polyol .

100 kg of the modified polyol was compounded in the same components and ratios as in Comparative Example 5, mixed, and then mixed at high speed. Further, the foaming pressure was measured in the same manner as in Comparative Example 5, and the final product was obtained, and the final product after 24 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.24 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor was 105 mm, and the thickness of the product after 24 hours was 103 mm.

According to Comparative Example 5 and Comparative Example 6, when 2 to 4 parts by weight of the imine polyol was added to 100 parts by weight of the modified polyol, the foaming pressure was lowered, and thus the thickness of the final product was considerably thin Although it did, it was considered to be lacking in reaching the demand level of industrial field.

[Example 6]

47 kg of the recycled polyol of Example 1 and 47 kg of the new polyol were mixed to prepare 94 kg of a mixed polyol. Then, 6 kg of the imine polyol according to Example 5 was mixed to prepare 100 kg of a modified polyol .

100 kg of the modified polyol was compounded in the same components and ratios as in Comparative Example 5, mixed, and then mixed at high speed. Further, the foaming pressure was measured in the same manner as in Comparative Example 5, and the final product was obtained, and the final product after 24 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.20 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor device was 105 mm, and the thickness of the product after 24 hours was 102 mm.

On the other hand, when the thickness of the final product was 200 mm, the foaming pressure after the urethane reaction was 0.20 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor was 208 mm, The thickness was 202 millimeters.

[Example 7]

46 kg of the regenerated polyol according to Example 1 and 46 kg of the new polyol were mixed to prepare 92 kg of a mixed polyol and then 8 kg of the imine polyol according to Example 5 was mixed to prepare 100 kg of a modified polyol .

100 kg of the modified polyol was compounded in the same components and ratios as in Comparative Example 5, mixed, and then mixed at high speed. Further, the foaming pressure was measured in the same manner as in Comparative Example 5, and the final product was obtained, and the final product after 24 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.17 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor device was 104 mm, and the thickness of the product after 24 hours was 100 mm.

On the other hand, when the thickness of the final product was 200 mm, the foaming pressure after the urethane reaction was 0.17 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor was 208 mm, The thickness of which was 201 mm.

[Example 8]

45 kg of the regenerated polyol according to Example 1 and 45 kg of the new polyol were mixed to prepare 90 kg of a mixed polyol and then 10 kg of the imine polyol according to Example 5 was mixed to prepare 100 kg of a modified polyol .

100 kg of the modified polyol was compounded in the same components and ratios as in Comparative Example 5, mixed, and then mixed at high speed. Further, the foaming pressure was measured in the same manner as in Comparative Example 5, and the final product was obtained, and the final product after 24 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.15 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor device was 103 mm, and the thickness of the product after 24 hours was 100 mm.

On the other hand, when the thickness of the final product was 200 mm, the foaming pressure after the urethane reaction was also 0.15 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor was 207 mm, The thickness of which was 200 millimeters.

[Example 9]

44 kg of the regenerated polyol according to Example 1 and 44 kg of the new polyol were mixed to prepare 88 kg of a mixed polyol and then 12 kg of the imine polyol according to Example 5 was mixed to prepare 100 kg of a modified polyol .

100 kg of the modified polyol was compounded in the same components and ratios as in Comparative Example 5, mixed, and then mixed at high speed. Further, the foaming pressure was measured in the same manner as in Comparative Example 5, and the final product was obtained, and the final product after 24 hours was obtained.

In this case, the foaming pressure after the urethane reaction was 0.15 kgf / cm 2, the thickness of the product measured after passing through the belt conveyor device was 103 mm, and the thickness of the product after 24 hours was 100 mm.

On the other hand, when the thickness of the final product was 200 mm, the foaming pressure after the urethane reaction was also 0.15 kgf / cm 2, the thickness of the product after passing through the belt conveyor was 206 mm, The thickness of which was 200 millimeters.

Although the method of producing the rigid polyurethane foam according to the present invention has been described in detail, it is based on the perceived matters in the process of confirming the properties of the present invention. It should not be interpreted as being limited to what is applied.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (6)

A method for collecting and recycling hardly waste polyurethane foam is a method for collecting waste disused waste polyurethane foam and treating the waste polyurethane foam by a depolymerization method to obtain a recycled polyol and using the recycled polyol to produce a polyurethane foam, By weight based on the total weight of the polyurethane foam.
The method according to claim 1,
Characterized in that 6 to 12 parts by weight of the imine polyol are mixed with 100 parts by weight of the polyol compound containing the recycled polyol and then the additive and isocyanate necessary for the urethane reaction are added to proceed the urethane reaction. &Lt; / RTI &gt;
3. The method of claim 2,
Characterized in that when the imine polyol reaches a temperature of 120 ° C or higher by urethane reaction, the bond between the imine bonds causes a metathesis reaction, thereby causing the exchange reaction of the imine polyol. (Method for producing urethane foam).
The method of claim 3,
The imidized polyol undergoes a metathesis reaction at an internal temperature of 120 캜 to 140 캜 of the urethane reaction product during the urethane reaction,
In the urethane reaction process, the foaming agent expands, and the urethane reaction product forms fine bubbles (micro cells) to form a foam foam.
In this process, the metathesis reaction by the imine polyol lowers the foaming pressure by making the initial fine bubbles finer, thereby using the method of manufacturing the rigid polyurethane foam.
5. The method of claim 4,
The imidized polyol reduces the foaming pressure of the urethane reactant produced by recycling the waste polyurethane product so that the thickness of the final polyurethane product that has passed 24 hours after the belt conveyor device is formed to a thickness of 100 mm to 101 mm &Lt; / RTI &gt; wherein the polyurethane foam is a polyurethane foam.
5. The method of claim 4,
The imidized polyol reduces the foaming pressure of the urethane reactant produced by recycling the waste polyurethane product so that the thickness of the final polyurethane product that has passed 24 hours after the belt conveyor device is formed to a thickness of 200 to 202 millimeters &Lt; / RTI &gt; wherein the polyurethane foam is a polyurethane foam.

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