Method for producing a decomposition composition, and composition for producing polyurethane foam.

Abstract

This technology provides a way to efficiently decompose polyurethane foam. [Solution] A method for producing a decomposition composition obtained by reacting polyurethane foam with a composition containing compound A and compound B, wherein compound A is a polyhydric alcohol, compound B is a metal carboxylate salt or a heterocyclic amine compound, and the amount of compound A added is greater than 100 parts by mass per 100 parts by mass of polyurethane foam.

Description

Technical Field

[0001] The present disclosure relates to a method for producing a decomposition composition and a composition for producing a polyurethane foam.

Background Art

[0002] Polyurethane foams are used in various fields. Attempts have been made to chemically decompose the edge materials of polyurethane foams, used polyurethane foams, etc. for reuse.

[0003] For example, Patent Document 1 discloses a method for producing a recycled polyol by decomposing a polyurethane foam using a glycol and a catalyst.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, depending on the type of decomposing agent, undissolved residues etc. may occur, and there is a risk that decomposition may not be achieved satisfactorily. Therefore, a technique capable of decomposing polyurethane foam satisfactorily is required.

[0006] The present disclosure has been made in view of the above circumstances, and an object thereof is to provide a technique capable of decomposing polyurethane foam satisfactorily. The present disclosure can be realized in the following forms.

Means for Solving the Problems

[0007] A method for producing a decomposition composition obtained by reacting a polyurethane foam with a composition containing Compound A and Compound B, wherein Compound A is a polyhydric alcohol, The compound B is a metal carboxylate salt or a heterocyclic amine compound. A method for producing a decomposition composition, wherein the amount of compound A added is greater than 100 parts by mass per 100 parts by mass of polyurethane foam. [Effects of the Invention]

[0008] This disclosure provides a technology that can effectively decompose polyurethane foam. [Modes for carrying out the invention]

[0009] Herein lies a preferred example of this disclosure. [1] A method for producing a decomposition composition obtained by reacting polyurethane foam with a composition containing compound A and compound B, The aforementioned compound A is a polyhydric alcohol, The compound B is a metal carboxylate salt or a heterocyclic amine compound. A method for producing a decomposition composition, wherein the amount of compound A added is greater than 100 parts by mass per 100 parts by mass of polyurethane foam.

[0010] [2] The method for producing the decomposition composition according to [1], wherein the amount of compound B added is 10 parts by mass or more per 100 parts by mass of polyurethane foam.

[0011] A composition for manufacturing polyurethane foam, comprising a decomposition composition obtained by the method for producing the decomposition composition described in [3], [1], or [2].

[0012] [4] A polyurethane foam manufacturing composition according to [3], for application by spray method.

[0013] The disclosure is described in detail below. In this specification, when a numerical range is described using "-", it includes both the lower and upper limits unless otherwise specified. For example, the description "10-20" includes both the lower limit "10" and the upper limit "20". In other words, "10-20" has the same meaning as "10 or more and 20 or less". Furthermore, in this specification, the upper and lower limits of each numerical range can be combined in any way.

[0014] 1. Method for producing the decomposition composition The present disclosure describes a method for producing a decomposition composition obtained by reacting polyurethane foam with a composition containing compound A and compound B (hereinafter also referred to as a decomposition agent). Compound A is a polyhydric alcohol. Compound B is a metal carboxylate salt or a heterocyclic amine compound. The amount of compound A added is greater than 100 parts by mass per 100 parts by mass of polyurethane foam.

[0015] 1-1. Polyurethane foam The decomposition composition is obtained by decomposing polyurethane foam. The polyurethane foam is not particularly limited. The polyurethane foam may be flexible polyurethane foam, semi-rigid polyurethane foam, or rigid polyurethane foam. The polyurethane foam may be closed-cell structure polyurethane foam or open-cell structure polyurethane foam. The polyurethane foam may be crushed to a predetermined size. Alternatively, the polyurethane foam may be cut to a predetermined size. The polyurethane foam may be, for example, scraps discharged during the manufacturing process of polyurethane foam, or used polyurethane foam that is scheduled to be discarded.

[0016] 1-2.Compound A Compound A is a polyhydric alcohol. The polyhydric alcohol is not particularly limited as long as it can chemically decompose and liquefy the urethane bond. Examples of the polyhydric alcohol include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, trimethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, polyoxyethylene glycol, polyoxypropylene glycol, glycerin, polyethylene glycol, and the like. These polyhydric alcohols can be used alone or in combination of two or more. Among these, ethylene glycol and diethylene glycol are preferred, and diethylene glycol is particularly preferred.

[0017] From the perspective of suppressing the residue in the decomposition of the polyurethane foam, the addition amount of Compound A is greater than 100 parts by mass with respect to 100 parts by mass of the polyurethane foam, preferably 130 parts by mass or more, more preferably 150 parts by mass or more, and still more preferably 170 parts by mass or more. From the perspective of the reactivity of the decomposition composition, the addition amount of the above Compound A is preferably 1000 parts by mass or less, more preferably 500 parts by mass or less, and still more preferably 300 parts by mass or less. From these perspectives, the addition amount of the above Compound A is greater than 100 parts by mass, preferably 130 parts by mass or more and 1000 parts by mass or less, more preferably 150 parts by mass or more and 500 parts by mass or less, and still more preferably 150 parts by mass or more and 300 parts by mass or less.

[0018] When compound A contains diethylene glycol and ethylene glycol, from the perspective of suppressing the residue in the decomposition of the polyurethane foam, the addition amounts of diethylene glycol and ethylene glycol are preferably greater than 100 parts by mass, more preferably 130 parts by mass or more, still more preferably 150 parts by mass or more, and even more preferably 170 parts by mass or more, based on 100 parts by mass of the polyurethane foam. From the perspective of the reactivity of the decomposition composition, the addition amounts of the above diethylene glycol and ethylene glycol are preferably 1000 parts by mass or less, more preferably 500 parts by mass or less, and still more preferably 300 parts by mass or less. From these perspectives, the addition amounts of the above diethylene glycol and ethylene glycol are preferably greater than 100 parts by mass, more preferably 130 parts by mass or more and 1000 parts by mass or less, still more preferably 150 parts by mass or more and 500 parts by mass or less, and even more preferably 150 parts by mass or more and 300 parts by mass or less.

[0019] When compound A contains diethylene glycol, from the perspective of suppressing the residue in the decomposition of the polyurethane foam, the addition amount of diethylene glycol is preferably 100 parts by mass or more, more preferably 120 parts by mass or more, and still more preferably 130 parts by mass or more, based on 100 parts by mass of the polyurethane foam. From the perspective of the reactivity of the decomposition composition, the addition amount of the above diethylene glycol is preferably 1000 parts by mass or less, more preferably 500 parts by mass or less, and still more preferably 300 parts by mass or less. From these perspectives, the addition amount of the above diethylene glycol is preferably 100 parts by mass or more and 1000 parts by mass or less, more preferably 120 parts by mass or more and 500 parts by mass or less, and still more preferably 130 parts by mass or more and 300 parts by mass or less.

[0020] When compound A contains ethylene glycol, the amount of ethylene glycol added is preferably 10 parts by mass or more, more preferably 25 parts by mass or more, and even more preferably 35 parts by mass or more, per 100 parts by mass of polyurethane foam, from the viewpoint of suppressing undissolved residue in the decomposition of the polyurethane foam. From the viewpoint of the reactivity of the decomposition composition, the amount of ethylene glycol added is preferably 1000 parts by mass or less, more preferably 500 parts by mass or less, and even more preferably 300 parts by mass or less. From these viewpoints, the amount of ethylene glycol added is preferably 10 parts by mass or more and 1000 parts by mass or less, more preferably 25 parts by mass or more and 500 parts by mass or less, and even more preferably 35 parts by mass or more and 300 parts by mass or less.

[0021] 1-3. Compound B Compound B is a metal carboxylate salt or a heterocyclic amine compound.

[0022] 1-3-1. Metal carboxylate salts A metal carboxylate salt is not particularly limited as long as it contains a carboxylate ion as an anionic component and a metal ion as a cationic component. Metal carboxylate salts can function as trimerization catalysts.

[0023] The carboxylic acids that make up carboxylic acid metal salts include aliphatic monocarboxylic acids with 1-18 carbon atoms such as acetic acid, octic acid, formic acid, propionic acid, butyric acid, valeric acid, caproic acid (hexanoic acid), caprylic acid (octanoic acid), capric acid (decanoic acid), undecanoic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, heptadecanoic acid, stearic acid, trifluoroacetic acid, phenylacetic acid, chloroacetic acid, glycolic acid, and lactic acid; cyclopentanecarboxylic acid, cyclohex Alicyclic monocarboxylic acids such as xancarboxylic acids; aromatic monocarboxylic acids with 7-14 carbon atoms such as benzoic acid, methylbenzoic acid, ethylbenzoic acid, propylbenzoic acid, isopropylbenzoic acid, butylbenzoic acid, isobutylbenzoic acid, tert-butylbenzoic acid, salicylic acid, anisic acid, ethoxybenzoic acid, propoxybenzoic acid, isopropoxybenzoic acid, butoxybenzoic acid, nitrobenzoic acid, fluorobenzoic acid, resorcinic acid, naphthalenecarboxylic acid, and biphenylcarboxylic acid. Aromatic polycarboxylic acids with 7-14 carbon atoms, such as phthalic acid, isophthalic acid, terephthalic acid, nitrophthalic acid, trimellitic acid, hemimeric acid, trimesic acid, pyromellitic acid, naphthalenedicarboxylic acid, etc.; oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanediic acid, dodecanediic acid, hexadecanedioic acid, heptadecanedioic acid, octadecanediic acid, methylmalonic acid, ethyl tilimalone Examples include acids, aliphatic polycarboxylic acids having 1-18 carbon atoms such as propyl malonic acid, butyl malonic acid, dimethyl malonic acid, diethyl malonic acid, methyl ethyl malonic acid, methyl succinic acid, ethyl succinic acid, methyl ethyl succinic acid, maleic acid, citraconic acid, and itaconic acid; and alicyclic polycarboxylic acids having 6-18 carbon atoms such as cyclopentanedicarboxylic acid, hexahydrophthalic acid, tetrahydrophthalic acid, methylhexahydrophthalic acid, and methyltetrahydrophthalic acid. Among these, acetic acid and octyl acid are preferred as carboxylic acids constituting the carboxylic acid metal salt.

[0024] Examples of metals that constitute carboxylate metal salts include alkali metals and alkaline earth metals. Examples of alkali metals include potassium, lithium, and sodium. Examples of alkaline earth metals include magnesium and calcium. Of these, potassium is preferred.

[0025] Preferred carboxylate metal salts include potassium acetate, sodium acetate, and potassium octylate.

[0026] 1-3-2. Heterocyclic amine compounds Examples of heterocyclic amine compounds include tertiary amines such as N,N',N"-tris(dimethylaminopropyl)hexahydro-S-triazine and N,N',N"-tris(dimethylaminopropyl)hexahydrotriazine. Heterocyclic amine compounds can function as trimerization catalysts. Among these, N,N',N"-tris(dimethylaminopropyl)hexahydro-S-triazine is preferred as the heterocyclic amine compound.

[0027] 1-4. Amount of compound B added The amount of compound B added is preferably 1 part by mass or more, more preferably 5 parts by mass or more, even more preferably 10 parts by mass or more, particularly preferably 20 parts by mass or more, and even more preferably 25 parts by mass or more, per 100 parts by mass of polyurethane foam, from the viewpoint of shortening the decomposition time of the polyurethane foam. From the viewpoint of the reactivity of the decomposition composition, the amount of compound B added is preferably 100 parts by mass or less, more preferably 70 parts by mass or less, and even more preferably 50 parts by mass or less. From these viewpoints, the amount of compound B added is preferably 1 part by mass or more and 100 parts by mass or less, more preferably 5 parts by mass or more and 70 parts by mass or less, even more preferably 10 parts by mass or more and 50 parts by mass or less, particularly preferably 20 parts by mass or more and even more preferably 25 parts by mass or more and 50 parts by mass or less.

[0028] 1-5. Manufacturing process of the decomposition composition In the manufacturing process of the decomposition composition, polyurethane foam is chemically decomposed using a composition (decomposition agent) containing compound A and compound B. When polyurethane foam is chemically decomposed with the decomposition agent, a liquid decomposition composition is obtained.

[0029] The closed-cell ratio of polyurethane foam (according to ASTM D6226) is preferably 10% to 100%, more preferably 30% to 100%, and even more preferably 50% to 100%. The apparent density of polyurethane foam is 10 kg / m³. 3 More than 100kg / m 3 The following is preferable: 20 kg / m 3 More than 60kg / m 3 The following is more preferable: 30 kg / m 3 More than 40kg / m 3 The following is even more preferable. The polyurethane foam is used, for example, as a residential insulation material made of cyclopentane foam. The foam particle size of the polyurethane foam, after being crushed to a predetermined size, is, for example, about 5 mm.

[0030] The decomposition conditions for polyurethane foam are not particularly limited. From the viewpoint of improving the decomposition rate, it is preferable to heat the polyurethane foam together with a decomposition agent. When heating polyurethane foam together with a decomposition agent, it is preferable to stir the mixture of polyurethane foam and decomposition agent.

[0031] The amount of decomposing agent added is preferably 120 parts by mass or more, more preferably 150 parts by mass or more, even more preferably 170 parts by mass or more, and particularly preferably 190 parts by mass or more, per 100 parts by mass of polyurethane foam, from the viewpoint of suppressing undissolved residue during decomposition of the polyurethane foam. The amount of the above-mentioned decomposing agent added is preferably 500 parts by mass or less, more preferably 300 parts by mass or less, even more preferably 250 parts by mass or less, particularly preferably 230 parts by mass or less, and even more preferably 210 parts by mass or less, from the viewpoint of the decomposition properties of the polyurethane foam and suppressing undissolved residue during decomposition. From these viewpoints, the amount of the above-mentioned decomposing agent added is preferably 120 parts by mass or more and 500 parts by mass or less, more preferably 150 parts by mass or more and 300 parts by mass or less, even more preferably 170 parts by mass or more and 250 parts by mass or less, particularly preferably 190 parts by mass or more and 230 parts by mass or less, and even more preferably 190 parts by mass or more and 210 parts by mass or less.

[0032] The heating temperature is preferably 80°C to 300°C, more preferably 100°C to 270°C, and even more preferably 150°C to 250°C, in order to improve the decomposition rate while suppressing the decomposition of the polyol as a decomposition composition, i.e., the polyol derived from the raw material polyol.

[0033] The decomposition time may be, for example, 10 minutes to 24 hours, or 30 minutes to 10 hours. The end point of the decomposition time may be set appropriately while checking the progress of decomposition of the polyurethane foam, depending on the size of the polyurethane foam, whether or not it is stirred, etc. Also, for example, when decomposing polyurethane foam at room temperature (e.g., 25°C) or below 80°C, the decomposition time may be set to be longer than 24 hours.

[0034] 2. Compositions for the manufacture of polyurethane foam The polyurethane foam manufacturing composition of this disclosure includes a decomposition composition obtained by the method described in "1. Method for producing a decomposition composition" above.

[0035] The composition for manufacturing polyurethane foam includes, for example, a polyol, the above-mentioned decomposition composition, and other raw materials (flame retardants, manufacturing agents, catalysts, blowing agents, etc.).

[0036] The composition for manufacturing polyurethane foam is preferably for application by spraying. Specifically, it is preferable to use a decomposition composition (decomposed polyol) as part of the raw materials for spray-on insulation. In the spray method, liquid A (polyol-containing composition) and liquid B (isocyanate) are mixed on-site, and polyurethane foam (so-called on-site foamed polyurethane foam) is formed by spraying with a spray foaming machine. In this case, a part or all of liquid A is made from the decomposition composition.

[0037] 3. Effects of this Disclosure According to the method for producing the decomposition composition of this disclosure, polyurethane foam can be effectively decomposed using a decomposition agent (a composition containing compound A and compound B), and a liquid decomposition composition can be obtained. Furthermore, by adding compound B in an amount of 10 parts by mass or more per 100 parts by mass of polyurethane foam, decomposition can be accelerated and the decomposition time can be shortened. [Examples]

[0038] 1. Decomposition treatment of polyurethane foam 1-1. Disassembly Method Decomposition agents for the examples and comparative examples (corresponding to the "composition containing compound A and compound B" in claim 1) containing the components listed in Table 1-3 were prepared. Compound A is a polyhydric alcohol, and compound B is a catalyst. The prepared polyurethane foam was decomposed using the decomposition agents for the examples and comparative examples as follows. The following polyurethane foams were used. BASF INOAC Polyurethane Corporation, Product Name: FoamLite (Density: 30kg / m³) 3 -40kg / m 3 , void cell content: 70%-100%, cyclopentane foam used for residential insulation. Please note that the sum of the decomposing agents in the table may not always equal 100% due to differences in significant figures and the effects of rounding.

[0039] [Table 1]

[0040] [Table 2]

[0041] [Table 3]

[0042] Polyurethane foam was crushed to a particle size of 5 mm and placed in a container with a decomposition agent. The container was placed on a hot plate heated to 200°C and left to stand for 60 minutes (more than 60 minutes for Example 4) to obtain the decomposition composition.

[0043] The details of the catalyst are as follows: Comparative Example 1: N,N-dimethylcyclohexylamine (PC8) Comparative Example 2: 3,3',3''-nitrilotris(N,N-dimethyl-1-propanamine)(PC9) Comparative Example 3: Bis(2-dimethylaminoethyl) ether (containing 30% by mass of dipropylene glycol) (TC-ET) Comparative Example 4: Triethylmethylammonium 2-ethylhexanoate (U-cat 18X) Example 1: N,N',N"-Tris(dimethylaminopropyl)hexahydro-S-triazine (PC41) Example 2: Potassium octylate (K-15 (containing 15% by mass of diethylene glycol)) Examples 3, 4, Comparative Example 5: Potassium acetate (PC46 (containing 62% by mass of ethylene glycol)) • Example 5: Sodium acetate

[0044] In Table 1-3, "DEG" represents diethylene glycol, "EG" represents ethylene glycol, "DPG" represents dipropylene glycol, and "PUF" represents polyurethane foam.

[0045] The formulation of the decomposition agent in Example 3 will be explained in detail. The decomposition agent consisted of diethylene glycol, ethylene glycol, and potassium acetate in a mass ratio of 134:41:25. The mass ratio of the decomposing agent to the polyurethane foam was 2:1. That is, when the polyurethane foam was 100 parts by mass, the polyhydric alcohol was 175 parts by mass (134 parts by mass of diethylene glycol, 41 parts by mass of ethylene glycol), and potassium acetate was 25 parts by mass.

[0046] The formulations of the decomposing agents in Example 1 and Comparative Examples 1-5 are the same as in Example 3, except that the catalysts shown in Table 1-3 were used. The formulation of the decomposing agent in Example 5 is the same as in Example 3, except that the catalysts shown in Table 2 were used and the ratio of diethylene glycol to ethylene glycol was different.

[0047] The formulation of the decomposition agent in Example 2 will be explained in detail. The decomposition agent consisted of diethylene glycol, ethylene glycol, and potassium octylate in a mass ratio of 138:37:25. The mass ratio of the decomposing agent to the polyurethane foam was 2:1. That is, when the polyurethane foam was 100 parts by mass, the polyhydric alcohol was 175 parts by mass (138 parts by mass of diethylene glycol, 37 parts by mass of ethylene glycol), and potassium octylate was 25 parts by mass.

[0048] The formulation of the decomposition agent in Example 4 will be explained in detail. The decomposition agent consisted of diethylene glycol, ethylene glycol, and potassium acetate in a mass ratio of 180:12:8. The mass ratio of the decomposing agent to the polyurethane foam was 2:1. That is, when the polyurethane foam was 100 parts by mass, the glycol was 192 parts by mass (180 parts by mass of diethylene glycol, 12 parts by mass of ethylene glycol), and potassium acetate was 7.6 parts by mass.

[0049] The composition of the decomposition agent in Comparative Example 5 will be explained in detail. The decomposition agent consisted of diethylene glycol, ethylene glycol, and potassium acetate in a mass ratio of 67:21:13. The mass ratio of the decomposing agent to the polyurethane foam was 1:1. That is, when the polyurethane foam was 100 parts by mass, there were 88 parts by mass of glycol (67 parts by mass of diethylene glycol and 21 parts by mass of ethylene glycol) and 13 parts by mass of potassium acetate.

[0050] Comparative Examples 6-8 contained only polyhydric alcohols as decomposition agents, without any catalyst. Comparative Example 6 contained diethylene glycol as the decomposition agent, Comparative Example 7 contained ethylene glycol as the decomposition agent, and Comparative Example 8 contained dipropylene glycol as the decomposition agent.

[0051] 1-2.Results In Examples 1-5, the polyurethane foam was decomposed, yielding a liquid decomposition composition. On the other hand, in Comparative Example 1-8, the polyurethane foam could not be decomposed. In Comparative Example 7, the ethylene glycol boiled at 200°C, and the polyurethane foam could not be decomposed. Examples 1-5 satisfy the following requirements (a) and (b). On the other hand, Comparative Examples 1-4 and 6-8 do not satisfy the following requirement (a). Comparative Example 5 does not satisfy the following requirement (b). (a) Compound B (catalyst) is a metal carboxylate salt or a heterocyclic amine compound. (i) The amount of compound A (polyhydric alcohol) added is greater than 100 parts by mass per 100 parts by mass of polyurethane foam. As shown in Examples 1-5, it was found that when the decomposition agent satisfies the above requirements (a) and (b), the polyurethane foam can be decomposed by the decomposition agent, and a liquid decomposition composition can be obtained.

[0052] In Examples 2 and 3, the decomposition time of the polyurethane foam was 45 minutes and 35 minutes, respectively. On the other hand, in Example 4, the decomposition time was 150 minutes. Examples 2 and 3 satisfy requirement (c) below. On the other hand, Example 4 does not satisfy requirement (c) below. (c) The amount of compound B added is 10 parts by mass or more per 100 parts by mass of polyurethane foam. As shown in Examples 2 and 3, by satisfying the above requirement (c), the decomposition of polyurethane foam could be accelerated and the decomposition time could be shortened.

[0053] 1-3. Decomposition process using an extruder In addition to heating with a hot plate, the polyurethane foam decomposition process was also performed using an extruder.

[0054] The extruder consisted of a cylinder having a raw material inlet and an outlet for discharging the decomposed material, and a screw housed within the cylinder. Polyurethane foam was crushed to a particle size of 5 mm and fed into the extruder along with decomposing agents (compound A and compound B). The polyurethane foam was then decomposed by heating (heating temperature: 200°C) and pressurizing while being transported within the cylinder, thereby obtaining decomposed products. The residence time of the mixture in the cylinder was 5 minutes.

[0055] When the decomposition agent of Example 3 and the decomposition agent of Example 5 were used to perform a decomposition process in an extruder, a liquid decomposition composition was obtained from the discharge port, indicating that decomposition was successful.

[0056] When the decomposition treatment was performed using the decomposition agents of Comparative Examples 1-8 in an extruder, undecomposed urethane foam waste was discharged, indicating that decomposition was not possible.

[0057] 2. Manufacturing of recycled polyurethane foam Recycled polyurethane foam was manufactured using the decomposition compositions. The decomposition compositions of Examples 3 and 5, along with other components (Solution A and Solution B), were blended in the proportions shown in Table 4 for "Recycled Polyurethane Foam 1" and "Recycled Polyurethane Foam 2," and recycled polyurethane foam was manufactured by spraying. The "OHV" column in Table 4 represents the hydroxyl value of each component, and the values ​​were measured in accordance with JIS K 0070. Details of each ingredient are as follows: • Foam stabilizer: Silicone foam stabilizer (SZ-1333, manufactured by Toray Dow Corporation) • Flame retardant: Tris(1-chloro-2-propyl) phosphate (TCPP) • Catalyst 1: 3,3',3''-nitrilotris (N,N-dimethyl-1-propanamine) (POLYCAT9, manufactured by EVONIK). • Catalyst 2: Amine catalyst (DABCO NE-300, manufactured by EVONIK) • Foaming agent: H2O • Isocyanate: Polymeric isocyanate (Crude MDI) (Lupranate M20S, manufactured by BASF INOAC Polyurethanes)

[0058] [Table 4]

[0059] Both recycled polyurethane foam 1 using the decomposition agent of Example 3 and recycled polyurethane foam 2 using the decomposition agent of Example 5 were successfully foamed. Furthermore, no turbidity was observed in the recycled polyurethane foam.

[0060] 3. Effects of the Examples This embodiment provides a technology that can effectively decompose polyurethane foam.

[0061] This disclosure is not limited to the embodiments detailed above, and various modifications or alterations are possible.

Claims

1. A method for producing a decomposition composition obtained by reacting polyurethane foam with a composition containing compound A and compound B, Compound A is a polyhydric alcohol, The compound B is a metal carboxylate salt or a heterocyclic amine compound. A method for producing a decomposition composition, wherein the amount of compound A added is greater than 100 parts by mass per 100 parts by mass of polyurethane foam.

2. The method for producing the decomposition composition according to claim 1, wherein the amount of compound B added is 10 parts by mass or more per 100 parts by mass of polyurethane foam.

3. A composition for manufacturing polyurethane foam, comprising a decomposed composition obtained by the method for producing the decomposed composition described in claim 1 or claim 2.

4. The polyurethane foam manufacturing composition according to claim 3, which is for application by spray method.

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