WO1996005238A1 - Flexible polyurethane foam and process for producing the same - Google Patents

Abstract

A flexible polyurethane foam produced by the reaction of an isocyanate compound with (a) molasses and (b) a polyol component having an average molecular weight of 600 to 6,000; a process for producing the foam; and a molasses/polyol composition to be used for producing a biodegradable flexible polyurethane foam. This foam has a flexibility similar to that of conventional flexible polyurethane foams in spite of the incorporation of molasses therein and is so excellent in biodegradability that it can be rapidly degraded in the natural environment. Since this foam has properties similar to those of conventional flexible polyurethane foams and can be spontaneously biodegraded after the use, it can be widely used not only as agricultural and horticultural materials but also in household and industrial fields.

Description

 TECHNICAL FIELD The present invention relates to a flexible polyurethane foam and a method for producing the same.

 The present invention relates to a polyurethane foam and a method for producing the same, and more particularly, to a flexible polyurethane foam easily decomposed by microorganisms in a natural environment and a method for producing the same. Background art

 Brass chips are now widely used because of their ease of processing, price, lightness, and ease of use.

 However, plastics, unlike naturally occurring polymer compounds, are hardly decomposed by microorganisms in the natural world, causing environmental pollution and a major social problem.

 That is, since blastic waste is hardly decomposed by the action of soil bacteria and the like, it remains in the dumped place for a long time, is very unsightly, and has caused problems in ecological environment.

 Of the plastics, polyurethane is prepared by reacting a polyol component and an isocyanate component. However, this is also almost non-biodegradable like other plastics, and polyurethane foam has a large capacity. It was a major cause of environmental pollution.

Several attempts have been made to impart biodegradability to this polyurethane. For example, Japanese Patent Publication No. 58-65605 discloses a hydrophilic urethane foam obtained by adding a powdered organic filler of microbes to a hydrophilic urethane foam. No. 63-2842842, No. 2 describes a method in which a top crack or plant powder is combined with a urethane resin obtained by the reaction of a polyol containing an ester group with an organic polyisocyanate. In addition, sheets and molded products that decompose in the natural world are disclosed.

 In each of these inventions, the presence of additives such as natural organic substances and plant fibers is essential, and it is considered that these greatly contribute to biodegradability. It is thought to be due to the degradability of the additive, not the degradability. The present inventors have conducted studies to obtain a biodegradable polyurethane, and have found that a biodegradable polyurene can be produced by first adding molasses to a polyol component which is a raw material of polyurethane. (Japanese Patent Application No. 3-334002).

 However, in this technique, molasses acts as a hard segment in the polyurethane, so that only a hard polyurethane can be obtained, and there is a problem that it cannot be used for applications requiring a soft polyurethane.

 Therefore, there has been a demand for the development of a technique for imparting biodegradability to soft polyurethane such as polyurethane foam. Disclosure of the invention

 In view of the above circumstances, the present inventors have further studied and found that a soft K polyurethane foam having excellent properties can be obtained by selecting a component having a constant molecular weight as a polyol component to be combined with molasses. The present invention has been completed.

 That is, the present invention provides the following two components (a) and (b)

 (a) molasses,

 (b) a polyol component having an average molecular weight of 600 to 600

And a method for producing the same, which is obtained by reacting a polyisocyanate with an isocyanate compound.

Another object of the present invention is to use the above polyurethane foam for conversion. It is intended to provide a molasses polyol composition for a biodegradable flexible polyurethane foam. BEST MODE FOR CARRYING OUT THE INVENTION

 Among the components constituting the polyurethane foam of the present invention, the molasses of the component (a) is obtained from sugarcane, sugar beet, etc., and may be purified molasses or molasses, or molasses obtained after sugar production. However, molasses is advantageous in terms of economy.

 This molasses generally contains about 17 to 25% water, so remove this water as needed and use it.

 The polyol component having an average molecular weight of 600 to 600 (hereinafter referred to as “polymer polyol”), which is the component (b) of the present invention, includes polyether-based and polyester-based polyols. Examples thereof include polyethylene glycol, polyvinylidene glycol, polyethylene adipate, polyethylene terephthalate, polycaprolactone, and polyester polyol (PES). Further, the isocyanate compound used in the present invention is not particularly limited, and may be an aliphatic polyisocyanate, an aliphatic polyisocyanate, an aromatic polyisocyanate, or a modified product thereof. And the like.

Among them, the aliphatic polyisocyanate includes, for example, hexamethylene diisocyanate (HDI), and the alicyclic polyisocyanate includes, for example, isophorone diisocyanate. Examples of the aromatic polyisocyanate include, for example, tolylene diisocyanate (TDI), xylylene diisocyanate, diphenylmethane diisocyanate (MDI), polymer diphenyl methane diisocyanate, triphenyl, and the like. Methane triisocyanate, tris (isocyanate phenyl) thiophosphate and the like. Examples of the modified polyisocyanate include urethane prepolymer, hexamethylene diisocyanate buret, hexamethylene diisocyanate trimer, isophorone diisocyanate trimer and the like.

 Among them, tolylene diisocyanate (TDI) having a ratio of 2,4 isomer / 2,6 isomer of 80,20, that is, TDI-80 is considered to be the flexibility and workability of urethane foam. Is preferred.

 The flexible polyurethane foam of the present invention is obtained by mixing the above molasses and a polyol component to form a molasses polyol composition for a biodegradable flexible polyurethane (hereinafter, referred to as “molasses polyol composition”), and then by a conventional method. It can be produced by reacting with a known isocyanate compound. Hereinafter, two preferred embodiments of the present invention will be described.

 (1) First, as a first embodiment, the following two components (a) and (b)

 (a) molasses,

(b _t ) Polyol component having an average molecular weight of 1000 to 6000

Preferably, a flexible polyurethane foam obtained by reacting with an isosilicate compound in the presence of an amine catalyst and a tin catalyst can be mentioned.

In the production of the flexible polyurethane foam in this embodiment, for example, molasses as the component (a) and (ffi molecular polyol as the bd component) are mixed, and then an amine-based catalyst and a tin-based catalyst are preferably added thereto. after added Isoshiane Bok compound, adding and mixing a small amount of water if ^{necessary, 10~: I 5 O e C} , preferably 20: line by at temperatures of L 20 ° C, to atmospheric pressure or elevated pressure reaction Will be

In this embodiment, it can be used without removing the water in the molasses. The (bj component) polymer polyol having an average molecular weight of 1000 to 6000 in the present embodiment may be a polyether or polyester polyol such as polyethylene glycol, polypropylene glycol, polyethylene adipate, or the like. It is preferable to use a polyol such as polyethylene terephthalate or polycaprolactone. The number of functional groups of the high molecular polyol is preferably divalent or trivalent, and the more preferable (bt) component has an average molecular weight of 3000 to 6000.

 In this embodiment, only a tin-based catalyst can be used as a catalyst for the urethane reaction. However, in some cases, the reaction becomes too fast to obtain a polyurethane foam having preferable physical properties. More preferably, both of the system catalysts are used.

 Among the urethane reaction catalysts, amine catalysts include diazabicyclooctane (DABCO), N-ethylmorpholine (NEM), triethylamine (TEA), N, Ν, Ν ', Ν', Ν'-pentyl methyl getyl triamine (PMDETA) and the like, and tin-based catalysts such as sodium succinate (SO) and dibutyltin dilaurate (DBTDL). Each of these catalysts may be used alone or in combination with two or more.

 In the production of the polyurethane foam of this embodiment, the compounding amounts of the above-mentioned components are as follows: (a) 0.1 to 99.9% by weight (hereinafter simply referred to as “%”), (b) 0.1 to 99.9%, and isocyanate compound in 0.1%. In particular, it is preferable that the component (a) is in the range of 10 to 30%, the component (bi) is in the range of 30 to 60%, and the content of the isocyanate compound is in the range of 10 to 60%.

 The use of amine catalysts and tin catalysts is presumed to be about 0.01 to 20% for amine catalysts and about 0.01 to 20% for tin catalysts. The weight ratio of amine catalyst to tin catalyst is 10%. : 1 to 1: about 10 should be sufficient.

(2) Next, as a second embodiment,

The next two components (a) and (b ₂ )

(a) molasses, (B ₂₎ an average molecular weight of 600 to 3,000, polyethylene glycol, polyprene lobby glycol, polyols selected from polyester polyols, the following additional components (c),

 (c) A molasses polyol composition is prepared by adding a polyol having an average molecular weight of 200 to 400 and selected from ethylene glycol, polyethylene glycol, and glycerin (hereinafter, referred to as “low molecular polyol”). And a flexible polyurethane foam obtained by reacting the same.

In this embodiment, firstly, the addition of molasses component (a) a low molecular weight polyol which is the component (c), were mixed and dissolved, then this (b ₂₎ molasses polyol composition added polymeric polyol is a component The product is converted and this is reacted with an isocyanate compound to produce a flexible polyurethane foam.

 Component (c), a low-molecular-weight polyol having an average molecular weight of 200 to 400 and selected from ethylene glycol, polyethylene glycol (PEG), and glycerin, has an action of dissolving molasses. The low-molecular polyol is preferably the above-mentioned one. For other polyols (polyols such as PEG-polyvinylene glycol, polyester polyol, and polyester polyol having a higher molecular weight), molasses can be sufficiently dissolved. Is difficult.

As髙分Ko polyols (b ₂₎ component in the present embodiment, the average molecular weight of 60 0 to 3000, PEG, polypropylene glycol (PPG), to use a polyol selected from polyester polyols (PE S) preferred. These polyols impart flexibility to the polyurethane that becomes hard K by the addition of molasses as the component (a), and act as a so-called plasticizer to replace it with softness.

Of the components (b ₂ ), PEG can soften polyurethane from those having an average molecular weight of 600 or more, and is solid (room temperature) from a molecular weight of 1000 or more, but molasses polyol up to an average molecular weight of about 3000. Pour point below the temperature at which the composition does not denature Since it does not have a particular viscosity, it is possible to use those having this range, that is, those having an average molecular weight in the range of 600 to 3,000.

 Also, in the case of PPG and PES, it is preferable to use those having an average molecular weight in the range of 1000 to 4000 and an average molecular weight of 1000 to 3000 for the same reason as PEG. Among them, examples of PES include polycabrolactone.

The amount of each component in the molasses polyol composition of this embodiment, (a) component is 10 to 25 wt.%, (B ₂₎ component 35 to 65%, be about 25 to 40% (c) component , in particular, (a) component 12 to 20% (b ₂₎ component 40 to 60%, and preferably in the range of 28 to 40% (c) component.

 The molasses polyol composition thus obtained can be used as it is as a polyol component of polyurethane.However, in order to obtain a better polyurethane, water derived from molasses is removed from the molasses polyol composition. However, it is preferable to reduce the water content to about 0.1 to 15%. That is, since the isocyanate compound that reacts with the polyol component has high reactivity with water, if the amount of water in the polyol component is large, the foaming reaction between the isocyanate compound and water proceeds preferentially, and the isocyanate compound The gelation reaction between the resin and the polyol does not proceed sufficiently, causing non-uniform cells, insufficient strength of the cell membrane, etc., reducing the strength of the polyurethane resin as a whole, and since the reaction is a heat-generating reaction, The inside of the polyurethane is burnt, making it impossible to obtain polyurethane with excellent physical properties.

 As a method for removing water from the molasses polyol composition, there are a reduced pressure moat method, a freeze-drying method, and the like. Among them, under a reduced pressure of about 40 to 0.01 Torr, at a temperature of about 30 to 9 CTC. A reduced pressure reduction method for removing water is preferred.

The molasses polyol composition of the present embodiment obtained as described above is mixed with, for example, a polyisocyanate compound and, if necessary, a small amount of water, and then mixed to 10 to 150. (:, Preferably 20 to: I 20. By reacting at the temperature of C, normal pressure or pressure, a flexible polyurethane foam having biodegradability is produced.

 The proportion of the polyisocyanate compound used in the production of the polyurethane of the present embodiment is 25 to 75%, preferably 35 to 65%.

In the production of the polyurethane foam, it is preferable to add a catalyst for the urethanization reaction to the molasses polyol composition as in the first embodiment. Examples of such a catalyst include tin-based amines and the like. Conventionally known ones can be used. In addition, in the above embodiment 1 or 2, the molasses polyol composition which is a mixture of the component (a) and the component (b) can be subjected to rapid centrifugal separation, if necessary, to remove insoluble matters. separation temperature of approximately 1 0-6 O ^e C, 2, 0 0 0 to 8, may be performed 1 0-6 0 min 0 0 0 rpm about the rotational speed.

 Furthermore, a non-flammable organic solvent such as methylene chloride may be used for the reaction, if necessary.

 The ureinization reaction is carried out in a molding die having a predetermined shape, whereby a polyurethane foam having an arbitrary shape, for example, a sheet-like, plate-like, column-like, container-like, etc. It can be.

 Polyurethane foams made by using the honey polyol composition of the present invention become flexible polyurethanes because the rigidity of molasses, which acts as a hard segment in the polyurethane, is reduced by the action of the polymer polyol. Polyurethane foam having properties is obtained.

Then, the molasses component incorporated in the polyurethane foam is rapidly decomposed by the action of microorganisms in the soil or the like after disposal, and shows biodegradability. Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Example 1

 Molasses (moisture content: about 20%) (10 g) was weighed into 90 g of polypropylene glycol 3000 (PPG 3000, average molecular weight 3000; diol type), and mixed and stirred with a mixing stirrer for about 1 hour. 4 g of water in the obtained mixture lO Og, 3.3 g of a foam stabilizer (NUC Silicone L-520; manufactured by Nippon Tunica Co., Ltd.), 0.07 g of tin-based catalyst (di-n-butyltin dilaurate) and amine Add 0.7 g of diazabicyclooctane catalyst and mix well. 71.2 g of tolylene diisocyanate is added thereto and stirred, and when the foaming starts, the stirring is stopped. After the foaming was sufficiently advanced, the product was further released to prepare a polyurethane foam (Product 1 of the present invention).

The obtained polyurethane foam had a density of 0.021 gZcm ² and a 25% compressive strength of 0.90 kPa. Example 2

Polyurethane foams were prepared in the same manner as in Example 1 except that the amounts of the components were changed as shown in Table 1 (Products of the present invention 2 and 3).

0

Amount (g) The present invention aa 3 Molasses 20 30

 PPG 3000 8 0 70

 Water 2 0

 Tolylene Sociate 78.8 86.0

 Foam stabilizer 3.3 3.3

 Tin-based catalyst 0.15 0.2

Amine-based catalyst 0.75 0.8 Of the polyurethane foams obtained in this example, Product 2 of the present invention had a density of 0.017 g / cm 25% compressive strength of 3.1 kPa, and Product 3 of the present invention The density was 0.016 g / cm ² and the 25% compressive strength was 2.5 kPa. Example 3

5 g of molasses (water content about 20%) was weighed into 95 g of polypropylene glycol 3000 (PPG300 C average molecular weight 3000; diol type), and mixed and stirred with a mixing and stirring machine for about 1 hour. To 100 g of the obtained mixture, 5 g of water, 3.0 g of a foam stabilizer (NUC Silicone L-520; manufactured by Nippon Rikiichi Co., Ltd.), and 1.06 g of a tin catalyst (di-n-butyltin dilaurate) were added. And mix well. 103.4 g of clean diphenylmethane diisocyanate (MDI) was added thereto and stirred. Stir and stop stirring when foaming begins. After the foaming had sufficiently proceeded, the product was left standing for a while to prepare a polyurethane foam (Product 4 of the present invention).

The obtained polyurethane foam had a density of 0.02 g.Zcm ² and a compressive strength of 30 kPa. Example 4

 Polyurethane foams were prepared in the same manner as in Example 3 except that the amounts of the components were changed as shown in Table 2 (Products of the present invention 5 to 9).

 Table 2 Mixing amount (g) Original B month product Specified product Specified product: Ψ

 5 6 7 8 9

10 15 20 25 30

PPG

 3000 90 85 80 75 70

 Water 5 4 3 2 1 Crude

MD I 109.1 114.8 120.5 126.2 131.9 Foam stabilizer 3.0 3.0 3.0 3.0 3.0 Tin catalyst 1.10 1.14 1.18 1.21 1.25 Example 5

 (1) Manufactured around honey polyol composition:

 Molasses (moisture content 19.6%) 2 Og was weighed into 40 g of polyethylene glycol 200 (PEG200, average molecular weight 200) and mixed with a mixing stirrer for about 1 hour. The mixture was stirred. Then, the mixture was centrifuged at 8000 rpm for 20 minutes using a fast-centrifuge to remove solid residue. The supernatant liquid after centrifugation was reduced under reduced pressure at 1 Torr for 4 hours using a centrifugal evaporator. Further, 80 g of polypropylene glycol 3000 (PPG3000, average molecular weight 3000) was added to 20 g of the obtained solution to obtain 100 g of a molasses polyol composition.

 (2) Polyurethane foam made of silk:

 100 g of the molasses polyol composition obtained in (1) above, 2.4 g of water, 2.5 g of a silicone-based surfactant (NUC Silicone L-540; manufactured by Nippon Tunicer Co., Ltd.), 2.5 g of a tin-based catalyst (di-n-butyl dilaurate) Add 0.30 g of tin) and 0.50 g of amine catalyst (触媒, Ν, Ν ', Ν', Ν'-pentamethylethylentriamine) and stir well. Add 54 g of TDI-80 and stir to stop stirring when foaming starts. After the foaming had sufficiently proceeded, the product was left standing for a while to make a polyurethane foam mesh (Product 10 of the present invention).

Polyurethane foam thus obtained has a density of 0.028 gZc m ^3. 25% compressive strength is 1.40 k P a,弹性ratio was 37.7 kPa. Example 6

A polyurethane foam was produced in the same manner as in Example 5 except that the amounts of the components were changed as shown in Table 3 (Product 11 of the present invention). Three

The polyurethane foam thus obtained had a density of 0.030 gZcm ³ , a 25% compressive strength of 1.58 kPa, and an elastic modulus of 21.2 kPa. Example 7

 (1) Preparation of molasses polyol composition:

 Molasses (moisture content 19.6%) 20 g to 40 g polyethylene glycol 200

(PEG 200, average molecular weight 200) and mixed for about 1 hour with a mixing stirrer. Then, the mixture was centrifuged at 8000 rpm for 20 minutes by a centrifuge to remove solid residue. The supernatant liquid after centrifugation was reduced under reduced pressure for 1 hour at a pressure of 1 Torr using a fast-center evaporator. Further, 60 g of polyethylene glycol 600 (PEG600, average molecular weight 600) was added to the obtained solution 40. Then, 100 g of molasses polyol composition was obtained.

 (2) Made of polyurethane foam:

 To 100 g of the molasses polyol composition obtained in the above (1), 1.0 g of water, 1.6 g of a silicone-based surfactant (NUC Silicone L-520; manufactured by Nippon Tunica Co., Ltd.), 0.8 g of a silicone-based foaming agent, Add 2.8 g of a tin-based catalyst (di-n-butyltin dilaurate) and 2.8 g of an amine-based catalyst (Ν, Ν, Ν ', Ν ", Ν" —pentymethylmethylentriamine). Mix. Add 49 g of Crude MDI and stir, then stop stirring when foaming starts. After the foaming had sufficiently proceeded, the product was further left overnight to prepare a polyurethane foam.

The polyurethane foam thus obtained was a flexible foam in which cells were connected, and the density was 0.14 gZcm ³ . Example 8

 (1) Preparation of molasses polyol composition:

 Molasses (moisture content: 19.6%) (20 g) was weighed into 40 g of PEG200, and mixed and stirred with a mixing stirrer for about 1 hour. Then, the mixture was centrifuged at 8000 rpm for 20 minutes using a centrifugal separator to remove solid residue. The supernatant liquid after the fast-centrifugal separation was concentrated under reduced pressure at a pressure of 1 Torr for 4 hours using a fast-heart evaporator. Further, 50 g of PEG600 was added to 50 g of the obtained solution to obtain 10 Og of a molasses polyol composition.

 (2) Preparation of polyurethane foam:

To 50 g of the molasses polyol composition obtained in (1) above, 25 g of a silicone-based surfactant (NUC silicone L-520; manufactured by Nippon Riki-ichi Co., Ltd.), and a tin-based catalyst (di-n-butyl diphosphate) 0.15 g of tin) and 1.15 g of amine catalyst (触媒, Ν, Ν ', Ν ", Ν" -pentymethylmethylentriamine) are added and stirred well. There Add 71.5 g of a mixture of equal amounts of MD I and HD I and stir. Stop stirring when foaming starts. After the foaming had sufficiently proceeded, the product was allowed to stand overnight to prepare a polyurethane foam (Product 12 of the present invention). Example 9

 (1) Preparation of molasses polyol composition:

 Molasses (moisture content 19.6%) 20 g was weighed in 4 Og of PEG200, and mixed and stirred for about 1 hour with a mixing stirrer. Next, the mixture was centrifuged at 8000 rpm for 20 minutes using a centrifuge to remove solid residue. After centrifugation, the supernatant was concentrated under reduced pressure at a pressure of 1 T rr for 4 hours using a fast-center evaporator. Furthermore, 50 g of polypropylene glycol 3000 (PPG3000, average molecular weight 3000) was added to 50 g of the obtained solution to obtain 100 g of a molasses polyol composition.

 (2) Made of polyurethane foam:

 To 50 g of the molasses polyol composition obtained in (1) above, 10 g of water, 2.5 g of a silicone surfactant (NUC Silicone L-520; manufactured by Nippon Rikiichi Co., Ltd.), 2.5 g of a silicone foaming agent 2.5 g, 0.4 g of tin-based catalyst (di-n-butyltin dilaurate) and 0.4 g of amine-based catalyst (Ν,, Ν ', Ν ", Ν" Methylethylene tritriamine) Mix. Then add 227 g of MD I and stir the mixture. When the foaming starts, stop stirring the mixture. After the foaming had sufficiently proceeded, the product was further left to stand to prepare a polyurethane foam (Product 13 of the present invention).

The polyurethane foam thus obtained was a flexible foam in which cells were connected, and had a density of 0.018 gZcm ³ . Comparative Example 1

(1) Preparation of molasses polyol composition: Molasses (moisture content 19.6%) 20 g was weighed in 40 g of PEG200, and mixed and stirred for about 1 hour with a mixing and stirring machine. Then, the mixture was subjected to quick-centrifugation at 80 OO rpm for 20 minutes by a quick-centrifuge to remove solid residue. The supernatant liquid after centrifugation was reduced under reduced pressure at 1 Torr for 4 hours using a centrifugal evaporator to obtain 60 g of a molasses polyol composition.

 (2) Preparation of polyurethane foam:

To 100 g of the molasses polyol composition obtained in the above (1), 4.3 g of a silicone-based surfactant (NUC Silicone L-5420; manufactured by Nippon Tunica Co., Ltd.), a tin-based catalyst

(Di-n-butyltin dilaurate) 0.44 g is added and stirred well. Add 169.2 g of Clued MDI thereto and stir, and stop stirring when foaming starts. After the foaming had sufficiently proceeded, the product was left standing for a while to prepare a polyurethane foam (Comparative product 1).

The polyurethane foam thus obtained had a density of 0.040 gZcm ³ , a compressive strength of 412.1 kPa and an elastic modulus of 29.2 MPa. Comparative Examples 2 and 3

Polyurethane foam was converted in the same manner as in Comparative Example 1 except that the amounts of the components were changed as shown in Table 4 (Comparative products 2 and 3).

Table 4

Amount (g)

Comparative product 2 Comparative product 3

!

 Molasses 25 29

 P P G 200 75 7 1

 Cruise M D I 168.2 1 69.3

 Foam stabilizer 4.3 4.3

 'Tin based catalyst 0.86 0.86

Among the obtained polyurethane foams, Comparative Product 2 has a density of 0.034 g / cm ³ , a compressive strength of 230.2 kPa, and an elastic modulus of 16.7 MPa, and Comparative Product 3 has a density of 0.045 g / c and a compressive strength of 434.9 kPa. The elastic modulus was 32.2 MPa.

Industrial applicability

 The polyurethane foam of the present invention had the same flexibility as the conventional flexible polyurethane foam while incorporating molasses. It was also excellent in biodegradability and decomposed rapidly in nature.

 Therefore, the polyurethane foam of the present invention has the same physical properties as a conventional flexible polyurethane foam, and is naturally biodegradable after it is no longer needed, and is naturally used as a material for agricultural and agricultural industries. It can be widely used for home use, industrial use, etc.

Claims

The scope of the claims 1. The following two components (a) and (b)  (a) molasses,  (b) a polyol component having an average molecular weight of 600 to 600 Is reacted with an isocyanate compound to obtain a flexible polyurethane foam. 2. The flexible polyurethane foam according to claim 1, wherein the component (b) is a polyether-based polyol or a polyester-based polyol. 3. The flexible polyurethane foam according to claim 1 or 2, wherein the component (b) is polyethylene glycol, polypropylene glycol, polyethylene acetate, polyethylene terephthalate, or polycaprolactone. 4. The compounding amount of the (a) component is 10 to 30% by weight, the compounding amount of the (b) component is 30 to 60% by weight, and the compounding amount of the isocyanate compound is 10 to 60% by weight. Claims Item 4. The flexible polyurethane foam according to any one of Items 1 to 3. 5. The flexible polyurethane foam according to any one of claims 1 to 4, which is obtained by reacting with an amine catalyst and a tin catalyst. 6. The flexible polyurethane foam according to claim 5, wherein the amine-based catalyst is used in an amount of 0.01 to 20% by weight and the tin-based catalyst is used in an amount of 0.01 to 20% by weight. 7. Molasses and a polyol component having an average molecular weight of 600 to 600 A process for producing a flexible polyurethane foam, comprising adding an amine-based catalyst and a tin-based catalyst to a mixture, and then adding an isocyanate compound. 8. The following components (a) and (b)  (a) molasses,  (b) a polyol component having an average molecular weight of 600 to 6000 A molasses polyol composition for a biodegradable flexible polyurethane foam, comprising: 9. The component (b) is a polyol component having an average molecular weight of 600 to 3000, and the following component (c)  (c) a polyol selected from ethylene glycol, polyethylene glycol, and glycerin having an average molecular weight of 200 to 400, 9. The molasses polyol composition for a biodegradable flexible polyurethane foam according to claim 8, comprising: 10. The biodegradable soft polyurethane according to claim 9, which contains 10 to 25% by weight of the component (a), 35 to 65% by weight of the component (b), and 25 to 40% by weight of the component (c). Molasses polyol composition 11. The molasses polyol composition for biodegradable soft polyurethane according to claim 9 or 10, which contains 0.1 to 15% by weight of water. 12. The following three components (a), (b ₂ ) and (c)  (a) molasses, (B ₂₎ an average molecular weight of 600 to 3,000, polyethylene glycol, polybutylene Polyol selected from lovirene glycol and polyester polyol  (c) a polyol having an average molecular weight of 200 to 400, selected from ethylene glycol, polyethylene glycol, and glycerin; A method for producing a biodegradable flexible polyurethane foam, comprising reacting a molasses polyol composition for a biodegradable flexible polyurethane containing the compound with an isocyanate compound. 13. Polyurethane foam produced by the method according to claim 12.