Polyurethane foam and composition for producing polyurethane foam

Abstract

[Problem] To provide a technology for producing a novel polyurethane foam that can reduce the load on the environment. [Solution] The present technology provides a polyurethane foam having a biodegradation degree after 45 days of at most 15% and a biodegradation degree after 180 days of at least 30%, as measured in the biodegradation degree test of ISO 14885-2. Moreover, the present technology provides: a composition for producing a polyurethane foam, the composition comprising a polyol and a biomass-derived isocyanate; and a polyurethane foam formed using said composition for producing a polyurethane foam.

Description

Polyurethane foam and composition for producing polyurethane foam

[0001] The present technology relates to polyurethane foams and compositions for making polyurethane foams.

[0002] Polyurethane foams are used in a wide variety of fields, from furniture such as sofas and chairs, bedding such as mattresses and pillows, clothing such as underwear, daily necessities such as dish sponges and cleaning sponges, interior products for vehicles and aircraft such as car seats, toys, and miscellaneous goods. Various developments are underway to improve quality and add new functions according to each field and purpose.

[0003] In recent years, in order to contribute to the formation of a sustainable society, techniques for producing foams using biomass resources have also been proposed. For example, Patent Document 1 discloses a rigid polyurethane foam produced using a prepolymer that is a reaction product of at least one polyisocyanate component, at least one hydroxy-functional acrylate component, and at least one polyol component that is a biopolymer containing castor oil, soybean oil, etc.

[0004] Furthermore, in order to be environmentally friendly, techniques for producing highly biodegradable foams have also been proposed. For example, Patent Document 2 discloses a technique for producing biodegradable polyurethane foams using a composition containing a mixture based on poly(hydroxybutyrate) polymer, a polyol made from renewable sources, an isocyanate, and additives.

[0005] Special table 2007-522325 publication Special table 2009-527598 publication

[0006] As mentioned above, technologies that use biomass resources and impart biodegradability to foams are being developed, but the reality is that further consideration for the environment is desired. Therefore, the main objective of this technology is to provide a technology for producing novel polyurethane foams that can reduce the environmental burden.

[0007] This technology first provides a polyurethane foam that, in a biodegradation test according to ISO 14885-2, has a biodegradability of 15% or less after 45 days and a biodegradability of 30% or more after 180 days. The polyurethane foam according to this technology can use a biomass-derived ester polyol as a raw material. The polyurethane foam according to this technology can also use a primary amine as a raw material.

[0008] The present technology next provides a composition for producing polyurethane foam, comprising a polyol and a biomass-derived isocyanate. The polyol used in the composition for producing polyurethane foam according to the present technology may include a biomass-derived polyol. The present technology also provides a polyurethane foam formed using the composition for producing polyurethane foam according to the present technology. The biomass content of the polyurethane foam according to the present technology can be 50% or more.

[0009] 1 is a graph showing the change in biodegradability over time for 180 days in Experimental Example 1.

[0010] Preferred embodiments for implementing the present technology will be described below. The embodiments described below are examples of typical embodiments of the present technology, and any of the embodiments can be combined. Furthermore, the scope of the present technology will not be interpreted narrowly by these embodiments.

[0011] [First embodiment] 1. Polyurethane foam The polyurethane foam according to the present technology is characterized by having a biodegradability of 15% or less after 45 days and a biodegradability of 30% or more after 180 days in the ISO 14885-2 biodegradation test. Because the polyurethane foam according to the present technology has a biodegradability of 15% or less after 45 days, it is possible to prevent early deterioration and maintain quality for a certain period of time. Furthermore, because the polyurethane foam according to the present technology has a biodegradability of 30% or more after 180 days, it is possible to exhibit good biodegradability in a general environment.

[0012] The polyurethane foam according to the present technology may be any of flexible, rigid, and semi-rigid polyurethane foams, but flexible polyurethane foams are particularly preferred. Specifically, those with an elongation of 50% or more are preferred, and those with an elongation of 90% or more are more preferred. Polyurethane foams with an elongation in this range are sufficiently flexible compared to semi-rigid and rigid polyurethane foams, and can be considered flexible polyurethane foams.

[0013] The hardness of the polyurethane foam according to the present technology is not particularly limited as long as it does not impair the purpose and effects of the present technology, but the lower limit is, for example, 10 or more, preferably 20 or more, more preferably 30 or more, and even more preferably 40 or more. The upper limit of the hardness of the polyurethane foam is, for example, 100 or less, preferably 90 or less, more preferably 80 or less, and even more preferably 70 or less. In the present technology, the hardness is a value measured using an Asker rubber hardness tester, type F.

[0014] The foam density of the polyurethane foam according to the present technology is not particularly limited as long as it does not impair the purpose and effect of the present technology, but the lower limit thereof is, for example, 20 kg / m ３ , preferably 40 kg / m ３ , more preferably 60 kg / m ３ , more preferably 70 kg / m ３ The upper limit of the foam density of the polyurethane foam is, for example, 200 kg / m ３ , preferably 150 kg / m ３ , more preferably 100 kg / m ３ , more preferably 90 kg / m ３ By setting the foam density within this range, the appearance of the polyurethane foam becomes even better.

[0015] In the prior art, yeast fungi and the like that decompose polyurethane have been developed, but these fungi are specialized decomposing fungi and have the problem of not being biodegradable in general environments. On the other hand, conventional foams that are highly biodegradable even in general environments have the problem of rapid deterioration and poor quality retention. However, the polyurethane foam of the present technology is biodegradable even in general environments and also has good quality retention.

[0016] Taking advantage of its high quality, the polyurethane foam according to the present technology can be used for a wide variety of purposes in a wide variety of fields, including furniture such as sofas and chairs, bedding such as mattresses and pillows, clothing such as underwear, daily necessities such as tableware and cleaning sponges, vehicle and aircraft interior products such as car seats, construction joint materials, construction cushioning materials, construction sealants, home appliance sealants, soundproofing materials, packaging materials, vehicle insulation materials, anti-condensation materials, interior materials, home appliance insulation materials, pipe insulation materials, various covers, cushioning materials, toys, and miscellaneous goods.

[0017] 2. Composition for Producing Polyurethane Foam The polyurethane foam according to the present technology can use biomass-derived ester polyols and primary amines as raw materials. Furthermore, other materials that can be used as raw materials for general polyurethane foams can be freely selected and used as long as they do not impair the purpose and effects of the present technology. The composition for producing the polyurethane foam according to the present technology is described below.

[0018] The composition for producing polyurethane foam used in the present technology may contain a biodegradable polyol, an isocyanate, a primary amine, a blowing agent, a catalyst, a foam stabilizer, a biodegradation accelerator, etc. Each component will be described in detail below.

[0019] (1) Biodegradable Polyols The biodegradable polyols that can be used in the present technology can be one or more biodegradable polyols that can be used in the production of polyurethane foams, as long as they do not impair the purpose and effects of the present technology. Examples of biodegradable polyols that can be used in the present technology include polyglycolic acid (PGA), polylactic acid (PLA), polybutylene succinate (PBS), polybutylene succinate adipate (PBSA), polybutylene adipate terephthalate (PBAT), polycaprolactone (PCL), polyethylene glycol (PEG), polyvinyl alcohol (PVA), polyhydroxyalkanoic acid (PHA), cellulose, cellulose acetate, chitosan, starch, modified starch, xylitol, sorbitol, mannitol, maltitol, and hydroxyl-containing biomass-derived ester polyols such as castor oil-based polyols. Among these, in the present technology, it is preferable to use a biomass-derived ester-based polyol having a hydroxyl group, such as a castor oil-based polyol represented by the following chemical formula (1), and polycaprolactone (PCL) represented by the following chemical formula (2) may be used in combination. Note that it is preferable to use only biodegradable polyols as polyols, but other polyols may also be mixed and used. The other polyols will be described in the second embodiment below.

[0020]

[0021] (m and n are integers of 1 or more)

[0022] In the polyurethane foam-producing composition according to the present disclosure, the content of the biodegradable polyol per 100 parts by mass of polyol is, for example, 50 parts by mass or more, preferably 55 parts by mass or more, more preferably 60 parts by mass or more, and even more preferably 65 parts by mass or more. By setting the content of the biodegradable polyol per 100 parts by mass of polyol within this range, the environmental load reduction effect can be improved.

[0023] In the polyurethane foam-producing composition according to the present technology, the upper limit of the amount of biodegradable polyol per 100 parts by mass of polyol is not particularly limited as long as it does not impair the action and effect of the present technology, and in consideration of biodegradability, it is preferable to use only biodegradable polyols. The upper limit of the amount of plant-derived polyol per 100 parts by mass of polyol can be set, for example, to 100 parts by mass or less, 90 parts by mass or less, 85 parts by mass or less, 80 parts by mass or less, 75 parts by mass or less, 70 parts by mass or less, etc.

[0024] (2) Isocyanate The isocyanate that can be used in the present technology can be one or more isocyanates that can be used in the production of polyurethane foam, as long as the purpose and effects of the present technology are not impaired. Examples of isocyanates that can be used in the present technology include aromatic isocyanates, aliphatic isocyanates, and alicyclic isocyanates.

[0025] Examples of aromatic isocyanates that can be used in the present technology include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, xylylene diisocyanate, 3,3'-dimethyl-4,4'-biphenylene diisocyanate, and 3,3'-dimethoxy-4,4'-biphenylene diisocyanate.

[0026] In this technology, it is preferable to use an aliphatic isocyanate and / or an alicyclic isocyanate as the isocyanate. Aliphatic isocyanates and alicyclic isocyanates are characterized by high degradability, which can contribute to environmental conservation. In the polyurethane foam according to this technology, the ester bond portion derived from the polyol is hydrolyzed, and the urethane bond derived from the polyol and isocyanate is hydrolyzed, thereby decomposing into an isocyanate-derived amine and a polyol. In this technology, by using a degradable aliphatic isocyanate and / or alicyclic isocyanate as the isocyanate, a highly degradable polyurethane foam can be produced.

[0027] Examples of aliphatic isocyanates include trimethylene diisocyanate, 1,2-propylene diisocyanate, butylene diisocyanate (tetramethylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate), hexamethylene diisocyanate (HDI), pentamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethyl Examples of the isocyanate include hexamethylene diisocyanate, 2,6-diisocyanatomethyl caproate, lysine diisocyanate, trimethylhexamethylene diisocyanate, 1,5-pentamethylene diisocyanate (PDI), decamethylene diisocyanate, lysine ester triisocyanate, 1,6,11-undecane triisocyanate, 1,3,6-hexamethylene triisocyanate, and lysine triisocyanate (LTI (2,6-Diisocyanato hexanoic acid 2-isocyanatoethyl ester)).

[0028] Examples of alicyclic isocyanates include monocyclic alicyclic isocyanates such as 1,3-cyclopentane diisocyanate, 1,3-cyclopentene diisocyanate, cyclohexane diisocyanate (1,4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate), 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (isophorone diisocyanate, IPDI), dimer acid diisocyanate, transcyclohexane 1,4-diisocyanate, hydrogenated tolylene diisocyanate (hydrogenated TDI), and hydrogenated tetramethylxylylene diisocyanate (hydrated TMXDI); and crosslinked cyclic alicyclic isocyanates such as norbornene diisocyanate, norbornane diisocyanate methyl, diisocyanatomethyl bicycloheptane, bicycloheptane triisocyanate, and di(diisocyanatomethyl)tricyclodecane.

[0029] Among these, in the present technology, it is preferable to select HDI isocyanurate (HDI trimer, 2,4,6-trioxo-1,3,5-triazine-1,3,5-triyltris(6,1-hexanediyl)triisocyanate) represented by the following chemical formula (3), which is a trimer of hexamethylene diisocyanate (HDI), 1,5-PDI isocyanurate represented by the following chemical formula (4), which is a trimer of 1,5-pentamethylene diisocyanate (PDI), and lysine triisocyanate (LTI (2,6-Diisocyanato hexanoic acid 2-isocyanatoethyl ester)) represented by the following chemical formula (5).

[0030]

[0031]

[0032]

[0033] The number of carbon atoms of the isocyanate used in the present technology is not particularly limited, but for example, when a trimer of isocyanate is used, it is preferable that the carbon number of the isocyanate as a monomer is 6 or more.

[0034] The isocyanate group (NCO group) content (NCO%) in the isocyanate used in the present technology is, for example, 50% or less, 40% or less, preferably 35% or less, and more preferably 30% or less.

[0035] The amount of isocyanate used in the present technology can be freely set as long as it does not impair the purpose and effects of the present technology. In the present technology, the lower limit of the isocyanate in the composition is, for example, 20 parts by mass or more, preferably 40 parts by mass or more, more preferably 50 parts by mass or more, even more preferably 60 parts by mass or more, and particularly preferably 70 parts by mass or more, relative to 100 parts by mass of polyol. By setting the lower limit of the isocyanate content in the composition within this range, the foam shape of the produced polyurethane foam can be further improved.

[0036] In this technology, the upper limit of the isocyanate content in the composition is, for example, 200 parts by mass or less, preferably 150 parts by mass or less, more preferably 130 parts by mass or less, and even more preferably 100 parts by mass or less, relative to 100 parts by mass of polyol. Setting the upper limit of the isocyanate content in the composition within this range has the advantage of reducing costs.

[0037] In the present technology, the isocyanate index can also be freely set as long as it does not impair the purpose and effects of the present technology. In the present technology, the lower limit of the isocyanate index is, for example, 60 or more, preferably 70 or more, and more preferably 80 or more. By setting the lower limit of the isocyanate index of the polyurethane foam within this range, the strength of the polyurethane foam to be produced can be improved.

[0038] In the present technology, the upper limit of the isocyanate index is, for example, not more than 130, preferably not more than 120, and more preferably not more than 110. Setting the upper limit of the isocyanate index content of the polyurethane foam within this range has the advantage of reducing costs, and also prevents the polyurethane foam from becoming too hard, making it brittle and losing its flexibility, thereby improving the elasticity of the polyurethane foam.

[0039] In the present technology, the isocyanate index is a value calculated by [(isocyanate equivalent in the composition for producing polyurethane foam / active hydrogen equivalent in the composition for producing polyurethane foam)×100].

[0040] (3) Primary amines can be used in the present technology. In particular, primary amines having at least one primary amino group and an active hydrogen group such as a hydroxyl group and having two to four functional groups can be used in the present technology.

[0041] When producing polyurethane foam, the balance between the resinification reaction and the foaming reaction is extremely important. For example, if the resinification reaction is slower than the foaming reaction, the viscosity of the polyurethane foam-producing composition also increases slowly, which makes it easier for gas generated in the foaming reaction to escape, resulting in unstable foaming behavior. Furthermore, the cure time (hardening time) is also long, making the composition unsuitable for general molding, resulting in poor mass productivity and poor design of the produced polyurethane foam. However, this technology uses a primary amine to accelerate the initial viscosity increase (cream time), promote internal heat generation, improve the reactivity of the resinification reaction, and increase the reactivity of the foaming reaction, thereby shortening the rise time. As a result, a good balance between the resinification reaction and the foaming reaction can be maintained even when using raw materials with low reactivity during production, such as aliphatic isocyanates and / or alicyclic isocyanates or biodegradable polyols, to improve biodegradability.

[0042] Furthermore, when producing polyurethane foam using raw materials with low reactivity during production, a method of increasing the amount of catalyst is used to increase reactivity, but increasing the amount of catalyst has the problem of destabilizing the resinification reaction and foaming reaction. Another method aims to shorten the reaction time by using a prepolymer in which a portion of a polyol and / or isocyanate has been reacted in advance as a raw material, but the high viscosity of the prepolymer causes a problem of reduced stirrability due to the increased viscosity of the raw material mixture. However, this technology uses a primary amine, which eliminates the need to increase the amount of catalyst, thereby stabilizing the resinification reaction and foaming reaction. Furthermore, because the reactivity is high even without the use of a prepolymer, the increase in viscosity of the raw material mixture can be suppressed, preventing a decrease in stirrability.

[0043] The amount of primary amine used in the polyurethane foam-producing composition according to the present technology can be freely set as long as it does not impair the purpose and effects of the present technology. In the present technology, the lower limit of the content of the primary amine in the polyurethane foam-producing composition is, for example, 0.5 parts by mass or more, preferably 1 part by mass or more, and more preferably 2 parts by mass or more, per 100 parts by mass of polyol. By setting the lower limit of the content of the primary amine in the polyurethane foam-producing composition within this range, the reactivity of the resinification reaction and the foaming reaction can be improved. As a result, even when a raw material with poor reactivity is used, a good balance between the resinification reaction and the foaming reaction can be maintained, and ultimately, a polyurethane foam with excellent mechanical properties and design properties can be obtained.

[0044] In this technology, the upper limit of the content of the primary amine in the composition for producing polyurethane foam is, for example, 20 parts by mass or less, preferably 15 parts by mass or less, more preferably 10 parts by mass or less, and even more preferably 7 parts by mass or less, per 100 parts by mass of polyol. By setting the upper limit of the content of the primary amine in the composition for producing polyurethane foam within this range, it is possible to prevent instability of the resinification reaction and the foaming reaction due to excessively high reactivity during production, and to prevent a decrease in stirrability due to an increase in viscosity during prepolymerization. Furthermore, if the resinification reaction proceeds too quickly compared to the foaming reaction, curing may proceed before the foaming reaction progresses, resulting in uneven foaming, uneven hardness, and poor foaming. However, by setting the upper limit of the content of the primary amine in the composition for producing polyurethane foam within this range, it is possible to maintain a good balance between the resinification reaction and the foaming reaction, thereby preventing uneven foaming, uneven hardness, poor foaming, and the like.

[0045] The number-average molecular weight of the primary amine that can be used in the present technology is not particularly limited as long as it does not impair the purpose and effects of the present technology. The lower limit of the number-average molecular weight of the primary amine that can be used in the present technology is, for example, 800 or more, preferably 1800 or more, and more preferably 2400 or more. Furthermore, the weight-average molecular weight of the primary amine that can be used in the present technology is not particularly limited as long as it does not impair the purpose and effects of the present technology. The lower limit of the weight-average molecular weight of the primary amine that can be used in the present technology is, for example, 800 or more, preferably 1800 or more, and more preferably 2400 or more. By setting the lower limit of the number-average molecular weight and / or weight-average molecular weight of the primary amine that can be used in the present technology within this range, it is possible to prevent instability of the resinification reaction and foaming reaction due to excessively high reactivity during production, and to prevent a decrease in stirrability due to an increase in viscosity during prepolymerization. Furthermore, it is possible to maintain a good balance between the resinification reaction and the foaming reaction, thereby preventing uneven foaming, uneven hardness, and poor foaming.

[0046] The upper limit of the number average molecular weight of the primary amine that can be used in the present technology is, for example, 12,000 or less, preferably 8,000 or less, and more preferably 6,000 or less. Furthermore, the upper limit of the weight average molecular weight of the primary amine that can be used in the present technology is, for example, 12,000 or less, preferably 8,000 or less, and more preferably 6,000 or less. By setting the upper limit of the number average molecular weight and / or weight average molecular weight of the primary amine that can be used in the present technology within this range, the reactivity during production can be improved. As a result, even when a raw material with low reactivity is used, a good balance between the resinification reaction and the foaming reaction can be maintained, and ultimately, a polyurethane foam with excellent mechanical properties and design properties can be obtained.

[0047] The number of oxyalkylene repeating units in the primary amine that can be used in the present technology is not particularly limited as long as it does not impair the purpose and effects of the present technology. The lower limit of the number of oxyalkylene repeating units in the primary amine that can be used in the present technology is, for example, 10 or more, preferably 20 or more, more preferably 30 or more, and even more preferably 40 or more. By setting the lower limit of the number of oxyalkylene repeating units in the primary amine that can be used in the present technology within this range, it is possible to prevent instability of the resinification reaction and the foaming reaction due to excessively high reactivity during production, and to prevent a decrease in stirrability due to an increase in viscosity during prepolymerization. In addition, it is possible to maintain a good balance between the resinification reaction and the foaming reaction, and to prevent uneven foaming, uneven hardness, and poor foaming, etc.

[0048] The upper limit of the number of oxyalkylene repeating units in the primary amine that can be used in the present technology is, for example, 200 or less, preferably 160 or less, more preferably 120 or less, and even more preferably 100 or less. By setting the upper limit of the number of oxyalkylene repeating units in the primary amine that can be used in the present technology within this range, reactivity during production can be improved. As a result, even when a raw material with poor reactivity is used, a good balance between the resinification reaction and the foaming reaction can be maintained, and ultimately, a polyurethane foam with excellent mechanical properties and design properties can be obtained.

[0049] The kinematic viscosity of the primary amine usable in the present technology is not particularly limited as long as it does not impair the purpose and effects of the present technology. The lower limit of the kinematic viscosity of the primary amine usable in the present technology is, for example, 100 cSt or more, preferably 200 cSt or more, and more preferably 300 cSt or more at 25°C.

[0050] The upper limit of the kinematic viscosity of the primary amine that can be used in the present technology is, for example, 2000 cSt or less, preferably 1500 cSt or less, and more preferably 1000 cSt or less at 25°C.

[0051] The amine hydrogen equivalent weight (AHEW) of the primary amine that can be used in the present technology is not particularly limited as long as it does not impair the purpose and effects of the present technology. The lower limit of the amine hydrogen equivalent weight (AHEW) of the primary amine that can be used in the present technology is, for example, 100 or more, preferably 200 or more, and more preferably 300 or more. By setting the lower limit of the amine hydrogen equivalent weight (AHEW) of the primary amine that can be used in the present technology within this range, it is possible to prevent instability of the resinification reaction due to excessively high reactivity during the resinification reaction, and to prevent a decrease in stirrability due to an increase in viscosity during prepolymerization. In addition, it is possible to maintain a good balance between the resinification reaction and the foaming reaction, and to prevent uneven foaming, uneven hardness, and poor foaming, etc.

[0052] The upper limit of the amine hydrogen equivalent weight (AHEW) of the primary amine that can be used in the present technology is, for example, 2000 or less, preferably 1500 or less, and more preferably 1000 or less. By setting the upper limit of the amine hydrogen equivalent weight (AHEW) of the primary amine that can be used in the present technology within this range, the reactivity of the resinification reaction can be improved. As a result, even when a raw material with low reactivity is used, a good balance between the resinification reaction and the foaming reaction can be maintained, and ultimately, a polyurethane foam with excellent mechanical properties can be obtained.

[0053] In the present disclosure, the amine hydrogen equivalent weight (AHEW) of a primary amine is defined as the molecular weight of a polyetheramine divided by the number of active amine hydrogens per molecule. The amine hydrogen equivalent weight (AHEW) of a primary amine can be calculated according to conventional techniques known to those skilled in the art, but is preferably calculated by determining the content of amine group nitrogen using the procedure described in ISO 9702.

[0054] Specific examples of primary amines that can be used in the present technology include one or more primary amines selected from polyester primary amines and polyether primary amines such as polyether triamines obtained by addition polymerization of oxyalkylene represented by the following chemical formula (6), poly(propylene glycol) triamines, and polyoxypropylene diamines, and one or more of these primary amines can be freely selected and used.

[0055] (n, x, y, and z are each an integer of 1 or greater)

[0056] In addition to primary amines, secondary amines and tertiary amines can also be used in the polyurethane foam-producing composition according to the present technology, as long as the purpose and effects of the present technology are not impaired. In this case, the proportion of primary amines in all amines is preferably 90% or more, more preferably 94% or more. By setting the proportion of primary amines in all amines within this range, the reactivity of the resinification reaction can be improved. As a result, even when using raw materials with low reactivity, a good balance between the resinification reaction and the foaming reaction can be maintained, and ultimately, a polyurethane foam with excellent mechanical properties can be obtained.

[0057] (4) Blowing Agent A blowing agent can be used in the composition for producing polyurethane foam according to the present technology. As the blowing agent that can be used in the present technology, one or more blowing agents that can be used in the production of polyurethane foam can be freely selected and used, as long as the purpose and effects of the present technology are not impaired.

[0058] Examples of the blowing agent include water, hydrocarbons, and halogenated compounds. Examples of hydrocarbons include cyclopentane, isopentane, and normal pentane. Examples of the halogenated compounds include methylene chloride, trichlorofluoromethane, dichlorodifluoromethane, nonafluorobutyl methyl ether, nonafluorobutyl ethyl ether, pentafluoroethyl methyl ether, and heptafluoroisopropyl methyl ether. In the present technology, it is preferable to use water as the blowing agent. The water may be ion-exchanged water, tap water, distilled water, or the like.

[0059] The amount of blowing agent used in the polyurethane foam-producing composition according to the present technology can be freely set as long as it does not impair the purpose and effects of the present technology. In the present technology, the lower limit of the blowing agent content in the polyurethane foam-producing composition is, for example, 0.1 parts by mass or more, preferably 0.5 parts by mass or more, and more preferably 1 part by mass or more, per 100 parts by mass of polyol. By setting the lower limit of the blowing agent content in the polyurethane foam-producing composition within this range, foamability can be improved, and as a result, polyurethane foams with excellent mechanical properties and appearance can be obtained.

[0060] In this technology, the upper limit of the blowing agent content in the polyurethane foam-producing composition is, for example, 10 parts by mass or less, preferably 8 parts by mass or less, and more preferably 5 parts by mass or less, per 100 parts by mass of polyol. By setting the upper limit of the blowing agent content in the polyurethane foam-producing composition within this range, formation defects due to excessive foaming can be suppressed and also contribute to cost reduction.

[0061] (5) Catalyst A catalyst can be used in the composition for producing polyurethane foam according to the present technology. As the catalyst that can be used in the present technology, one or more catalysts that can be used in the production of polyurethane foam can be freely selected and used, as long as the purpose and effects of the present technology are not impaired.

[0062] Examples of the catalyst include tin catalysts such as tin neodecanoate, dibutyltin dilaurate, and stannous octoate, and metal catalysts (organometallic catalysts) such as phenylmercury propionate and lead octenate. Other examples include triethylamine, triethylenediamine (TEDA), tetramethylguanidine, diethanolamine, bis(2-dimethylaminoethyl)ether, N,N,N',N",N"-pentamethyldiethylenetriamine, imidazole-based compounds, piperazine-based amines such as dimethylpiperazine, N-methyl-N'-(2-dimethylamino)ethylpiperazine, and N-methyl-N'-(2-hydroxyethyl)piperazine, morpholine-based amines such as N-methylmorpholine and N-ethylmorpholine, and 1,8-diazabis(2-methyl-N'-pentamethyldiethylenetriamine). Amine catalysts such as amines known as DBU homologues, such as rho-[5,4,0]-undecene-7 (DBU), 1,5-diazabicyclo-[4,3,0]-nonene-5 (DBN), 1,8-diazabicyclo-[5,3,0]-decene-7 (DBD), and 1,4-diazabicyclo-[3,3,0]octene-4 (DBO), can also be used. Of these amine catalysts, tertiary amine catalysts and secondary amine catalysts are preferred, and those having a molecular weight of less than 700 are more preferred, those having a molecular weight of less than 500 are even more preferred, and those having a molecular weight of less than 300 are even more preferred.

[0063] The amount of catalyst used in the polyurethane foam-producing composition according to the present technology can be freely set as long as it does not impair the purpose and effects of the present technology. In the present technology, the lower limit of the catalyst content in the polyurethane foam-producing composition is, for example, 0.1 parts by mass or more, preferably 0.5 parts by mass or more, and more preferably 1 part by mass or more, per 100 parts by mass of polyol. By setting the lower limit of the catalyst content in the polyurethane foam-producing composition within this range, the resinification reaction and the foaming reaction can be promoted, and as a result, polyurethane foams with excellent mechanical properties and appearance can be obtained.

[0064] In this technology, the upper limit of the catalyst content in the polyurethane foam-producing composition is, for example, 30 parts by mass or less, preferably 25 parts by mass or less, and more preferably 20 parts by mass or less, per 100 parts by mass of polyol. By setting the upper limit of the catalyst content in the polyurethane foam-producing composition within this range, destabilization of the resinification reaction and the foaming reaction can be prevented, and a good balance between the resinification reaction and the foaming reaction can be maintained. As a result, polyurethane foams with excellent mechanical properties and appearance can be obtained.

[0065] (6) Foam Stabilizer A foam stabilizer can be used in the composition for producing polyurethane foam according to the present technology. As the foam stabilizer that can be used in the present technology, one or more foam stabilizers that can be used in the production of polyurethane foam can be freely selected and used, as long as the purpose and effects of the present technology are not impaired.

[0066] Examples of foam stabilizers include silicone-based foam stabilizers, fluorine-containing compound-based foam stabilizers, surfactants, etc. Examples of silicone-based foam stabilizers include those mainly composed of siloxane chains, those in which siloxane chains and polyether chains have a linear structure, those that are branched, and those in which polyether chains are modified to be pendant to the siloxane chains.

[0067] The amount of foam stabilizer used in the polyurethane foam-producing composition according to the present technology can be freely set as long as it does not impair the purpose and effects of the present technology. In the present technology, the lower limit of the content of the foam stabilizer in the polyurethane foam-producing composition is, for example, 0.1 parts by mass or more, preferably 0.3 parts by mass or more, and more preferably 0.5 parts by mass or more, per 100 parts by mass of polyol. By setting the lower limit of the content of the foam stabilizer in the polyurethane foam-producing composition within this range, the foaming reaction can be stabilized, and as a result, polyurethane foams with excellent mechanical properties and appearance can be obtained.

[0068] In this technology, the upper limit of the content of the foam stabilizer in the composition for producing a polyurethane foam is, for example, 10 parts by mass or less, preferably 7 parts by mass or less, and more preferably 5 parts by mass or less, per 100 parts by mass of polyol. Setting the upper limit of the content of the foam stabilizer in the composition for producing a polyurethane foam within this range can contribute to cost reduction.

[0069] (7) Biodegradation Accelerator The composition for producing a polyurethane foam according to the present technology may contain a biodegradation accelerator. By using a biodegradation accelerator, biodegradability can be improved when biodegradable raw materials are used as raw materials for the polyurethane foam according to the present technology.

[0070] As the biodegradation promoter that can be used in the present technology, one or more biodegradation promoters that can be used in polyurethane foams can be freely selected and used, as long as they do not impair the purpose and effect of the present technology.

[0071] Examples of biodegradation promoters include sugars such as glucose, xylose, galactose, maltose, sucrose, chitin, and cellulose; starches; amino acids; peptides; gums such as tamarind gum; and lignin.

[0072] The amount of the biodegradation accelerator used in the polyurethane foam-producing composition according to the present technology can be freely set as long as it does not impair the purpose and effects of the present technology. In the present technology, the lower limit of the content of the biodegradation accelerator in the polyurethane foam-producing composition is, for example, 0.1 parts by mass or more, preferably 0.5 parts by mass or more, and more preferably 1 part by mass or more, per 100 parts by mass of polyol.

[0073] In the present technology, the upper limit of the content of the biodegradation accelerator in the composition for producing polyurethane foam is, for example, 10 parts by mass or less, preferably 7 parts by mass or less, and more preferably 5 parts by mass or less, per 100 parts by mass of polyol.

[0074] (8) Others In the composition for producing polyurethane foam according to the present technology, one or more of various components that can be used in compositions for producing polyurethane foam can be freely selected and used as other components depending on the purpose, as long as the purpose and effect of the present technology are not impaired.

[0075] Examples of components that can be used in the composition for producing polyurethane foam according to the present technology include flame retardants, stabilizers, plasticizers, colorants, antioxidants, crosslinking agents, antibacterial agents, dispersants, and ultraviolet absorbers.

[0076] 3. Method for Producing Polyurethane Foam The polyurethane foam according to the present technology can be produced by preparing a composition by mixing the components of the composition for producing polyurethane foam according to the present technology described above, and then proceeding with a resinification reaction and a foaming reaction. The resinification reaction and the foaming reaction can be carried out by freely combining any conventional method as long as it does not impair the purpose and effect of the present technology.

[0077] The foaming method for producing polyurethane foam according to the present technology can employ either slab foaming or mold foaming. Slab foaming is a method in which a polyurethane foam production composition (a polyurethane foam raw material) is mixed and discharged onto a belt conveyor, and foamed at atmospheric pressure and room temperature. On the other hand, mold foaming is a method in which a polyurethane foam production composition (a polyurethane foam raw material) is mixed and injected into a mold cavity, and foamed to the shape of the cavity. In the present technology, mold foaming is preferably employed from the viewpoint of ease of production. As described above, the present technology makes it possible to perform mold forming even when a large amount of biomass-derived raw material is used by using a primary amine.

[0078] [Second embodiment] 1. Composition for producing polyurethane foam The composition for producing polyurethane foam according to the present technology contains a polyol and a biomass-derived isocyanate. In addition, a primary amine, a blowing agent, a catalyst, a foam stabilizer, a biodegradation accelerator, etc. may be contained as needed. Each component will be described in detail below. Details of the primary amine, blowing agent, catalyst, foam stabilizer, and biodegradation accelerator are the same as those in the first embodiment described above, and therefore will not be described here.

[0079] (1) Polyol In the present technology, one or more polyols that can be used in the production of polyurethane foam can be freely selected and used in combination. Examples of polyols include polyester polyols, polycarbonate polyols, polyester ether polyols, polycaprolactone polyols, and polylactic acid polyols.

[0080] Examples of polyether polyols include polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, etc., which are obtained by polymerizing cyclic ethers such as ethylene oxide and propylene oxide, respectively, and copolyethers thereof. Polyether polyols can also be obtained by polymerizing the cyclic ethers using polyhydric alcohols such as glycerin and trimethylolethane. Commercially available polyether polyols may also be used.

[0081] Furthermore, polymer polyols can be used as the polyether polyol. Polymer polyols include those obtained by polymerizing an ethylenically unsaturated monomer in a polyether polyol, or those obtained by emulsifying and dispersing a polymer of an ethylenically unsaturated monomer in a polyether polyol. Specific examples include those obtained by graft polymerizing acrylonitrile, styrene, or the like onto a polyether polyol, and those obtained by dispersing polystyrene or polyacrylonitrile in a polyether polyol.

[0082] Examples of polyester polyols include aliphatic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, and azelaic acid; aliphatic carboxylic acids such as ricinoleic acid; aromatic dicarboxylic acids such as phthalic acid, terephthalic acid, isophthalic acid, and naphthalenedicarboxylic acid; alicyclic dicarboxylic acids such as hexahydrophthalic acid, hexahydroterephthalic acid, and hexahydroisophthalic acid; and acid esters or acid anhydrides of these with ethylene glycol, 1,3-propylene glycol, and 1,2-propylene glycol. , 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, 1,8-octanediol, 1,9-nonanediol, or the like, or a mixture thereof; polylactone polyols and polycaprolactone polyols obtained by ring-opening polymerization of lactone monomers such as ε-caprolactone and methylvalerolactone. In addition to these, examples of polyester polyols include polyols having naturally occurring ester groups.

[0083] Examples of polycarbonate polyols include those obtained by reacting at least one polyhydric alcohol such as ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, 1,8-octanediol, 1,9-nonanediol, or diethylene glycol with diethylene carbonate, dimethyl carbonate, diethyl carbonate, or the like.

[0084] Examples of polyester ether polyols include those obtained by a dehydration condensation reaction of an aliphatic dicarboxylic acid such as succinic acid, adipic acid, sebacic acid, or azelaic acid; an aromatic dicarboxylic acid such as phthalic acid, terephthalic acid, isophthalic acid, or naphthalenedicarboxylic acid; an alicyclic dicarboxylic acid such as hexahydrophthalic acid, hexahydroterephthalic acid, or hexahydroisophthalic acid; or an acid ester or anhydride thereof with a glycol such as diethylene glycol or a propylene oxide adduct, or a mixture thereof.

[0085] In the present technology, it is preferable to use a biomass-derived polyol as the polyol. As the biomass-derived polyol that can be used in the present technology, one or more biomass-derived polyols that can be used in the production of polyurethane foam can be freely selected and used, as long as the action and effect of the present technology are not impaired.

[0086] Examples of biomass-derived polyols that can be used in the present technology include polyols derived from natural fats and oils. Natural fat-derived polyols are natural fats and oils such as castor oil, soybean oil, rapeseed oil, and coconut oil, or derivatives thereof (such as modified natural fat and oil polyols and unmodified natural fat and oil polyols), which contain hydroxyl groups on the hydrocarbon chain and have two or more hydroxyl groups per molecule. In the present technology, two or more of these may be used in combination. Other biomass-derived polyols include, for example, corn-derived polyols and cashew nut shell liquid-derived polyols. Commercially available biomass-derived polyols may also be used.

[0087] Among these, it is preferable to use castor oil in the present technology. "Castor oil" includes unmodified castor oil, modified castor oil, dehydrated castor oil, hydrogenated castor oil, etc. More specifically, it is preferable to use a castor oil-based polyol represented by the above chemical formula (1).

[0088] In the polyurethane foam-producing composition according to the present disclosure, the content of the biomass-derived polyol per 100 parts by mass of polyol is, for example, 45 parts by mass or more, preferably 65 parts by mass or more, more preferably 85 parts by mass or more, and even more preferably 95 parts by mass or more. By setting the content of the biomass-derived polyol per 100 parts by mass of polyol within this range, the environmental load reduction effect can be improved.

[0089] In the polyurethane foam-producing composition according to the present technology, the upper limit of the amount of biomass-derived polyol per 100 parts by mass of polyol is not particularly limited as long as it does not impair the functions and effects of the present technology, and in consideration of reducing the environmental impact, it is preferable to use only biomass-derived polyols. The upper limit of the amount of biomass-derived polyol per 100 parts by mass of polyol can be set, for example, to 100 parts by mass or less, 90 parts by mass or less, 85 parts by mass or less, 80 parts by mass or less, 75 parts by mass or less, 70 parts by mass or less, etc.

[0090] In this technology, in consideration of the environment, a biodegradable polyol can also be used. Details of the biodegradable polyol are the same as those of the biodegradable polyol used in the first embodiment described above, and therefore a description thereof will be omitted here.

[0091] (2) Biomass-derived isocyanate The composition for producing a polyurethane foam according to the second embodiment is characterized in that it uses a biomass-derived isocyanate as the isocyanate. The use of a biomass-derived isocyanate can increase the biomass content of the polyurethane foam produced, thereby contributing to reducing the environmental impact.

[0092] As the biomass-derived isocyanate, one or more biomass-derived isocyanates that can be used in the production of polyurethane foam can be freely selected and used as long as they do not impair the functions and effects of the present technology. Examples include 1,5-pentamethylene diisocyanate (PDI), lysine triisocyanate (LTI (2,6-Diisocyanato hexanoic acid 2-isocyanatoethyl ester)), lysine diisocyanate (LDI (Hexanoic acid, 2,6-diisocyanato)), and dimer acid diisocyanate (DDI (3,4-dihexyl-5-(10-isocyanatodec-1-en-1-yl)-6-(8-isocyanatooctyl)cyclohex-1-ene)). Among these, in the present technology, it is preferable to select 1,5-PDI isocyanurate represented by the chemical formula (4), which is a trimer of 1,5-pentamethylene diisocyanate (PDI), and lysine triisocyanate (LTI (2,6-Diisocyanato hexanoic acid 2-isocyanatoethyl ester)) represented by the chemical formula (5).

[0093] In this technology, in addition to the biomass-derived isocyanate, it is also possible to use other commonly used isocyanates such as petroleum-derived isocyanates in combination. Details of the other isocyanates are the same as those of the isocyanates that can be used in the first embodiment described above, and therefore a description thereof will be omitted here.

[0094] In the composition for producing polyurethane foam according to the present disclosure, the content of the biomass-derived isocyanate per 100 parts by mass of isocyanate is, for example, 40 parts by mass or more, preferably 45 parts by mass or more, more preferably 50 parts by mass or more, and even more preferably 55 parts by mass or more. By setting the content of the biomass-derived isocyanate per 100 parts by mass of isocyanate within this range, the effect of reducing the environmental load can be improved.

[0095] In the polyurethane foam-producing composition according to the present technology, the upper limit of the content of biomass-derived isocyanate per 100 parts by mass of isocyanate is not particularly limited as long as it does not impair the action and effect of the present technology, and in consideration of reducing the environmental load, it is preferable to use all biomass-derived isocyanate. The upper limit of the content of biomass-derived isocyanate per 100 parts by mass of isocyanate can be set, for example, to 100 parts by mass or less, 90 parts by mass or less, 85 parts by mass or less, 80 parts by mass or less, 75 parts by mass or less, 70 parts by mass or less, etc.

[0096] The amount of biomass-derived isocyanate used in the present technology can be adjusted so as to achieve the amount of isocyanate and isocyanate index described in the first embodiment, and when used in combination with other isocyanates, the amount of the other isocyanates can also be taken into consideration.

[0097] 2. Polyurethane Foam The polyurethane foam of the second embodiment is a polyurethane foam produced using the composition for producing a polyurethane foam of the second embodiment described above.

[0098] The biodegradability of the polyurethane foam according to the second embodiment is not particularly limited, but similar to the polyurethane foam according to the first embodiment described above, in the biodegradability test of ISO 14885-2, it is preferable that the biodegradability after 45 days is 15% or less, and that the biodegradability after 180 days is 30% or more.

[0099] The biomass degree of the polyurethane foam according to the present technology can be freely set as long as it does not impair the functions and effects of the present technology. The lower limit of the biomass degree of the polyurethane foam according to the present technology is, for example, 20% or more, preferably 25% or more, more preferably 30% or more, even more preferably 35% or more, and particularly preferably 40% or more. The higher the biomass degree of the polyurethane foam according to the present technology, the more it contributes to the environment, so there is no upper limit to the biomass degree.

[0100] In this technology, the "biomass ratio" is a value calculated using the following formula: Biomass ratio (%) = {(weight of biomass material × biomass ratio of biomass material / 100) / total weight of raw materials} × 100

[0101] The other properties and uses of the polyurethane foam according to the second embodiment, such as hardness and density, are the same as those of the polyurethane foam according to the first embodiment described above, and therefore will not be described here.

[0102] 3. Method for Producing Polyurethane Foam The polyurethane foam according to the second embodiment can be produced by mixing the components of the composition for producing a polyurethane foam according to the second embodiment described above to prepare a composition, and then allowing a resinification reaction and a foaming reaction to proceed. Details of the production method are the same as those of the method for producing a polyurethane foam according to the first embodiment described above, and therefore will not be described here.

[0103] The present technology will be described in more detail below based on examples. Note that the examples described below are examples of typical examples of the present technology, and the scope of the present technology should not be construed as being narrow.

[0104] Unless otherwise specified, the materials used in the present examples are as follows: Petroleum-derived polypropylene glycol polyol: "KC737" from Sanyo Chemical Industries, Ltd. Petroleum-derived polycaprolactone polyol 1: "Placcel 308" from Daicel Corporation Petroleum-derived polycaprolactone polyol 2: "Placcel 205U" from Daicel Corporation Biomass-derived refined castor oil (ricinoleic acid triglyceride): "H-30" from Ito Oil Mills, Ltd. Biomass-derived sebacic acid ester polyol: "SE-2013C" from Ito Oil Mills, Ltd. Petroleum-derived polyetheramine: "T5000" from Mitsui Chemicals Fine Co., Ltd. Tin neodecanoate: "Neostan U50" from Nitto Kasei Kogyo Co., Ltd. TEDA (triethylenediamine): "DABCO Crystal" from Evonik Japan Co., Ltd. DBU (diazabicycloundecene): "U-CAT SA-102" from San-Apro Co., Ltd. 1,2-Dimethylimidazole (70%) + EG (30%): Evonik Japan Co., Ltd. "DABCO 2040" Silicone foam stabilizer: Evonik Japan Co., Ltd. "B-8742LF2" (Comparative Examples 1 to 4, Examples 4 and 6), Momentive Performance Materials Japan LLC "L594plus" (Examples 1 to 3, 5, 7 and 8) Diphenylmethane diisocyanate: Tosoh Corporation "Millionate NM" Hexamethylene diisocyanate (HDI) trimer: Asahi Kasei Corporation "Duranate TLA-100" Pentamethylene diisocyanate (PDI) trimer: Mitsui Chemicals, Inc. "Stabio D-376N"

[0105] Experimental Example 1 In Experimental Example 1, the biodegradability of polyurethane foam was investigated.

[0106] (1) Production of polyurethane foams After preparing compositions by mixing the raw materials shown in Table 1 below, the compositions were first poured into a foaming box (open without a lid) and allowed to foam freely, and the reactivity and foam moldability (appearance and foam state) were confirmed. Next, after preparing compositions by mixing the raw materials shown in Table 1 below, the compositions were transferred to a mold and allowed to foam, producing each polyurethane foam.

[0107] (2) Biodegradability Test The produced polyurethane foams were subjected to a biodegradability test using the following method.

[0108] [Soil Burial Test] Compost was prepared by mixing 4 kg of chicken manure compost, 1 kg of cow manure compost, 20 g of superphosphate, and 100 g of bacterial inoculum. Water was added at a compost:water ratio of 1:1 by weight, and the mixture was then covered and cultured at room temperature for 24 hours, followed by a further 24 hours at 58°C. If the fully matured compost after culture lost weight due to water evaporation, water was replenished to bring the moisture content to 50-75%, and if the pH was 9 or higher, it was neutralized with acetic acid to bring the pH to 7-9, thereby preparing fully matured compost.

[0109] The prepared fully matured compost was mixed with a polyurethane foam test piece (100 × 150 × 20 mm) at a weight ratio of 15:1 (6:1 dry weight ratio) and then sealed and left at 58°C. The weight and pH were checked periodically, and if there was a weight loss due to water evaporation, water was replenished to maintain a moisture content of 50-75%. If a decrease in compost was observed, a mixture of vermiculite and water (1:1 weight ratio) was added. If the pH was 9 or higher, it was neutralized with acetic acid to maintain a constant pH of 7-9, and the contents were stirred at least once a week.

[0110] The test specimens were removed 45 days after burial, taking care to prevent disintegration. After washing off any soil or other debris with water, they were dried in a constant temperature bath at 60°C for 24 hours, and the weight loss rate was calculated using the following formula: {(weight before burial - weight after 45 days) / (weight before burial)} x 100 = weight loss rate (%)

[0111] [Biodegradability] The biodegradability of Example 1, Comparative Examples 1 and 2, and Example 5 produced in Experimental Example 2 described later was measured for 180 days in accordance with ISO 14855-2.

[0112] (3) Results The results are shown in Table 1 below. The change in biodegradability over 180 days is shown in the graph of Figure 1.

[0113] Experimental Example 2 In Experimental Example 2, the influence of differences in raw materials used in the production of polyurethane foam on various physical properties was investigated.

[0114] (1) Production of Polyurethane Foams Each polyurethane foam was produced by mixing the raw materials shown in Table 2 below to prepare a composition, transferring it to a mold and foaming it.

[0115] (2) Evaluation The produced polyurethane foams were evaluated for various physical properties using the following methods.

[0116] [Reactivity] After preparing a composition by mixing the raw materials shown in Table 2 below, the composition was poured into a foaming box (open without a lid) and allowed to free foam, and the rise time was checked. ×: Rise time longer than 180 seconds, or insufficient viscosity increase causing bubbles to escape and preventing foam formation. △: Rise time 120 to 180 seconds. ○: Rise time less than 120 seconds.

[0117] [Foam shape] After preparing a composition by mixing the raw materials shown in Table 2 below, the composition was poured into a foaming box (open without a lid) and allowed to foam freely, and the foam condition was confirmed. ×: The foam collapsed during foaming, or cracks appeared on the exterior, resulting in poor appearance. Or, the cells on the cut surface inside the foam were rough. △: The foam was slightly deformed during foaming. ○: The foam foamability, appearance, and cells were almost uniform, all of which were good.

[0118] [Density] After molding, the mold was cut into a sample of 100 mm square x 20 mm thick, and the density of the sample was measured in accordance with JIS K7222:2005.

[0119] [Hardness] Measurement was performed using an Asker rubber hardness tester, type F.

[0120] (3) Results The results are shown in Table 2 below.

[0121]

[0122] (4) Discussion As shown in Table 2, Examples 6 to 8, which used a biomass-derived ester-based polyol, tended to have reduced reactivity, but the reactivity was improved by using a primary amine, as shown in Examples 2, 4, and 5. Furthermore, as shown in Example 3, the reactivity could also be improved by using a polycaprolactone-based polyol and a biomass-derived ester-based polyol in combination as polyols.

[0123] Furthermore, by using biomass-derived isocyanate, the biomass content could be increased to 75%.

Claims

1. In the ISO14885-2 biodegradability test, The biodegradability after 45 days is 15% or less, A polyurethane foam having a biodegradability of 30% or more after 180 days.

2. 2. The polyurethane foam according to claim 1, wherein a biomass-derived ester polyol is used as a raw material.

3. 3. The polyurethane foam according to claim 1, wherein a primary amine is used as a raw material.

4. The polyurethane foam described in claim 3, wherein the primary amine is one or more primary amines selected from primary amines having a number average molecular weight of 800 or more, polyester primary amines, and polyether primary amines.

5. A method using isocyanate as a raw material, and 3. The polyurethane foam according to claim 1, wherein the isocyanate is a petroleum-derived aliphatic isocyanate trimer or a biomass-derived aliphatic isocyanate.

6. A polyol, Biomass-derived isocyanate; Contains The polyol contains a castor oil-based polyol, The biomass-derived isocyanate comprises a trimer of 1,5-pentamethylene diisocyanate (PDI) and / or lysine triisocyanate (LTI (2,6-Diisocyanato hexanoic acid 2-isocyanatoethyl ester)).

7. A polyurethane foam formed using the composition for producing a polyurethane foam according to claim 6.

8. The polyurethane foam according to claim 7, having a biomass degree of 50% or more.