Polyurethane foam

Abstract

To provide a polyurethane foam that is produced from a composition containing plant-based raw materials and exhibits desired physical properties.SOLUTION: A polyurethane foam is produced from a polyurethane foam composition containing a polyol, an isocyanate, a blowing agent, and a catalyst. The polyurethane foam composition has an isocyanate index of 95 or more. The polyol contains a plant-based polyol. In the polyurethane foam composition, the content of the plant-based polyol is 5 pts.mass or more and 50 pts.mass or less relative to 100 pts.mass of the total amount of the polyol. The polyurethane foam has a density of 50 kg / m3 or more and 65 kg / m3 or less as measured in accordance with JIS K 7222.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present disclosure relates to polyurethane foams. [Background technology]

[0002] Patent Document 1 discloses a polyurethane foam formed from polyurethane raw materials including polyol, isocyanate, a blowing agent, and a catalyst. The polyol contains a petroleum-derived raw material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-35617 A Summary of the Invention [Problem to be solved by the invention]

[0004] From the viewpoint of environmental protection, etc., there is a demand for using plant-derived raw materials as raw materials for polyurethane foams. However, there is a concern that the use of plant-derived raw materials may result in the failure to obtain desired physical properties. The present disclosure has an object to provide a polyurethane foam having desired physical properties obtained from a composition containing a plant-derived raw material. The present disclosure can be realized in the following aspects. [Means for solving the problem]

[0005] [1] A polyurethane foam composition comprising a polyol, an isocyanate, a blowing agent, and a catalyst; The polyurethane foam composition has an isocyanate index of 95 or more, The polyol comprises a plant-derived polyol, the plant-derived polyol is present in an amount of 5 parts by mass or more and 50 parts by mass or less, relative to 100 parts by mass of the total amount of the polyol; Density (JIS K 7222) is 50kg / m 3 More than 65kg / m 3 Below is a polyurethane foam. Effect of the Invention

[0006] According to the present disclosure, it is possible to provide a polyurethane foam having desired physical properties obtained from a composition containing a raw material derived from plants. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Here, a preferred example of the present disclosure is given. [1] A polyurethane foam composition comprising a polyol, an isocyanate, a blowing agent, and a catalyst; The polyurethane foam composition has an isocyanate index of 95 or more, The polyol comprises a plant-derived polyol, the plant-derived polyol is present in an amount of 5 parts by mass or more and 50 parts by mass or less, relative to 100 parts by mass of the total amount of the polyol; Density (JIS K 7222) is 50kg / m 3 More than 65kg / m 3 Below is a polyurethane foam. [2] The polyurethane foam according to [1], having a hardness (JIS K 6400-2 6.4 A method) of 90N or less. [3] The polyurethane foam according to [1] or [2], having a rebound resilience (JIS K 6400-3:2011) of 15% or less. [4] Density (JIS K 7222) is 50 kg / m 3 More than 65kg / m 3 is as follows: Hardness (JIS K 6400-2 6.4 A method) is 90N or less, Rebound resilience (JIS K 6400-3:2011) is 15% or less A polyurethane foam having a biomass content of 5% or more and 30% or less.

[0008] The present disclosure will be described in detail below. In this specification, when a numerical range is described using "-", the lower limit and the upper limit are included 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". In this specification, the upper limit and the lower limit of each numerical range can be arbitrarily combined.

[0009] 1. Polyurethane foam of the first embodiment The polyurethane foam of the first embodiment is obtained from a polyurethane foam composition containing a polyol, an isocyanate, a blowing agent, and a catalyst. The polyurethane foam composition has an isocyanate index of 95 or more. The polyol contains a plant-derived polyol. The plant-derived polyol is present in an amount of 5 parts by mass or more and 50 parts by mass or less, relative to 100 parts by mass of the total amount of the polyol. The density (JIS K 7222) of the polyurethane foam is 50 kg / m 3 More than 65kg / m 3 The following is the result.

[0010] 1-1. Plant-derived polyols The plant-derived polyol is preferably at least one selected from the group consisting of castor oil-based polyol, corn oil-based polyol, soybean oil-based polyol, cashew oil-based polyol, palm oil-based polyol, palm kernel oil-based polyol, coconut oil-based polyol, olive oil-based polyol, cottonseed oil-based polyol, safflower oil-based polyol, sesame oil-based polyol, sunflower oil-based polyol, and linseed oil-based polyol. The plant-derived polyol is particularly preferably castor oil-based polyol.

[0011] The castor oil-based polyol is a polyol derived from castor oil. The "castor oil" of the present disclosure is preferably unmodified castor oil. The unmodified castor oil is, for example, extracted from the seeds of castor bean of the Euphorbiaceae family and purified. The unmodified castor oil is an ester of fatty acid and glycerin. The unmodified castor oil contains ricinoleic acid as a main component, and other components such as unsaturated fatty acids such as oleic acid, linoleic acid, and linolenic acid, and saturated fatty acids such as palmitic acid and stearic acid. The "castor oil" of the present disclosure may contain modified castor oil that has been subjected to crosslinking (modification) treatment with a dibasic acid or the like. The "castor oil" of the present disclosure may contain dehydrated castor oil that has been subjected to dehydration treatment to become a drying oil.

[0012] When the total amount of polyol is 100 parts by mass, the plant-derived polyol is 5 parts by mass or more, preferably 10 parts by mass or more, and more preferably 14 parts by mass or more, from the viewpoint of increasing the plant content. When the total amount of polyol is 100 parts by mass, the plant-derived polyol is 50 parts by mass or less, preferably 18 parts by mass or less, and more preferably 16 parts by mass or less, from the viewpoint of ensuring low resilience. From these viewpoints, when the total amount of polyol is 100 parts by mass, the plant-derived polyol is 5 parts by mass or more and 50 parts by mass or less, preferably 10 parts by mass or more and 18 parts by mass or less, and more preferably 14 parts by mass or more and 16 parts by mass or less. Here, the plant content of the plant-derived polyol is the proportion of plant-derived materials in the raw materials.

[0013] The hydroxyl value of the plant-derived polyol is preferably 110 mgKOH / g or more, more preferably 130 mgKOH / g or more, and even more preferably 150 mgKOH / g or more, from the viewpoint of promoting the reaction. The hydroxyl value of the plant-derived polyol is 190 mgKOH / g or less, preferably 180 mgKOH / g or less, and more preferably 170 mgKOH / g or less, from the viewpoint of suppressing heat generation during foaming. From these viewpoints, the hydroxyl value of the plant-derived polyol is 110 mgKOH / g or more and 190 mgKOH / g or less, preferably 130 mgKOH / g or more and 180 mgKOH / g or less, and more preferably 150 mgKOH / g or more and 170 mgKOH / g or less.

[0014] The weight average molecular weight of the plant-derived polyol is preferably 500 or more and 3,000 or less, more preferably 800 or more and 2,000 or less, and even more preferably 900 or more and 1,000 or less.

[0015] The number of functional groups of the plant-derived polyol is preferably 2 or more and 6 or less, and more preferably 2 or more and 3 or less.

[0016] 1-2.Petroleum-derived polyols The polyol preferably contains a petroleum-derived polyol. The petroleum-derived polyol is not particularly limited. Examples of the petroleum-derived polyol include polyether polyol, polymer polyol, and polyester polyol.

[0017] The polyether polyol is preferably selected from the group consisting of polyether polyols obtained by adding an alkylene oxide, such as ethylene oxide (EO) or propylene oxide (PO), to a polyhydric alcohol, such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, or sucrose.

[0018] It is preferable to use a plurality of types of polyether polyols in combination. For example, it is preferable to use three types of polyether polyols (a first polyether polyol, a second polyether polyol, and a third polyether polyol) in combination. In this case, the hydroxyl value of the first polyether polyol used is preferably 150 mgKOH / g to 300 mgKOH / g, more preferably 180 mgKOH / g to 250 mgKOH / g, and even more preferably 200 mgKOH / g to 230 mgKOH / g. The weight average molecular weight of the first polyether polyol is preferably 600 to 900, more preferably 650 to 850, and even more preferably 700 to 800. The number of functional groups of the first polyether polyol is preferably 2 to 6, more preferably 2 or 3, and even more preferably 3. The hydroxyl value of the second polyether polyol used is preferably 40 mgKOH / g to 70 mgKOH / g, more preferably 45 mgKOH / g to 65 mgKOH / g, and even more preferably 50 mgKOH / g to 60 mgKOH / g. The weight average molecular weight of the second polyether polyol is preferably 1500 to 2500, more preferably 1800 to 2200, and even more preferably 1900 to 2100. The number of functional groups of the second polyether polyol is preferably 2 to 6, more preferably 2 or 3, and even more preferably 2. The hydroxyl value of the third polyether polyol used is preferably 30 mgKOH / g to 60 mgKOH / g, more preferably 35 mgKOH / g to 50 mgKOH / g, and even more preferably 40 mgKOH / g to 45 mgKOH / g. The weight average molecular weight of the third polyether polyol is preferably 3500 to 4500, more preferably 3800 to 4200, and even more preferably 3900 to 4100. The number of functional groups of the third polyether polyol is preferably 2 to 6, more preferably 2 or 3, and even more preferably 3.

[0019] The polymer polyol may be, for example, a polymer polyol obtained by graft copolymerizing vinyl monomers such as acrylonitrile and styrene in a polyether polyol having a functionality of 2 or 3 as a base polyol. Examples of the base polyol include polyether polyols containing PO units (propylene oxide units) and EO units (ethylene oxide units) as AO units (alkylene oxide units).

[0020] The polyester polyol is preferably, for example, a polycaprolactone-based polyester polyol, an adipate-based polyester polyol, or the like. The polycaprolactone-based polyester polyol is preferably, for example, a polyester polyol obtained by ring-opening addition polymerization of lactones such as ε-caprolactone. The adipate-based polyester polyol is preferably, for example, a polyester polyol obtained by polycondensation of a polyfunctional carboxylic acid and a polyfunctional hydroxy compound. The polyester polyol also has the effect of making the cells of the polyurethane foam finer and more uniform.

[0021] The petroleum-derived polyol is preferably 60 parts by mass or more, more preferably 70 parts by mass or more, and even more preferably 80 parts by mass or more, from the viewpoint of obtaining the desired physical properties (hardness, resilience, etc.) when the total amount of the polyol is 100 parts by mass. The petroleum-derived polyol is preferably 95 parts by mass or less, more preferably 92 parts by mass or less, and even more preferably 90 parts by mass or less, from the viewpoint of obtaining the desired physical properties when the total amount of the polyol is 100 parts by mass. From these viewpoints, the petroleum-derived polyol is preferably 60 parts by mass or more and 95 parts by mass or less, more preferably 70 parts by mass or more and 92 parts by mass or less, and even more preferably 80 parts by mass or more and 90 parts by mass or less, when the total amount of the polyol is 100 parts by mass.

[0022] 1-3. Isocyanate The isocyanate is not particularly limited as long as it is a compound having two or more isocyanate groups, and those for polyurethane foams can be used. The isocyanate may be used alone or in combination of two or more. The isocyanate is preferably selected from the group consisting of aromatic, aliphatic, and alicyclic isocyanate compounds, and modified products thereof.

[0023] Examples of the aromatic isocyanate compound include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), crude diphenylmethane diisocyanate, naphthalene diisocyanate (NDI), p-phenylene diisocyanate (PPDI), xylene diisocyanate (XDI), tetramethyl xylene diisocyanate (TMXDI), and tolidine isocyanate (TODI). The aliphatic isocyanate compound is preferably selected from the group consisting of hexamethylene diisocyanate (HDI), lysine diisocyanate (LDI), and lysine triisocyanate (LTI). The alicyclic isocyanate compound is preferably selected from the group consisting of isophorone diisocyanate (IPDI), cyclohexyl diisocyanate (CHDI), hydrogenated XDI (H6XDI), and hydrogenated MDI (H12MDI). The modified isocyanate compound is preferably selected from the group consisting of urethane-modified, dimer-, trimer-, carbodiimide-modified, allophanate-modified, biuret-modified, urea-modified, isocyanurate-modified, oxazolidone-modified, and isocyanate-terminated prepolymers of isocyanate compounds.

[0024] As the isocyanate, for example, an aromatic isocyanate compound is preferably used. Among aromatic isocyanate compounds, toluene diisocyanate (TDI) is more preferably used in consideration of reactivity (higher reactivity than diphenylmethane diisocyanate (MDI)). The toluene diisocyanate (TDI) is preferably selected from the group consisting of 2,4-toluene diisocyanate (2,4-TDI), 2,6-toluene diisocyanate (2,6-TDI), and a mixture of 2,4-toluene diisocyanate (2,4-TDI) and 2,6-toluene diisocyanate (2,6-TDI). The mixture of 2,4-TDI and 2,6-TDI has a mixing ratio (2,4-TDI / 2,6-TDI, mass ratio) of preferably 50 / 50-90 / 10, more preferably 75 / 25-85 / 15.

[0025] The isocyanate index of the polyurethane foam composition is 95 or more, preferably 98 or more, and more preferably 100 or more, from the viewpoint of ensuring mechanical strength (tensile strength) and hardness. The isocyanate index of the polyurethane foam composition is preferably 115 or less, more preferably 110 or less, and even more preferably 105 or less, from the viewpoint of suppressing excessive hardness and suppressing the generation of reaction heat. From these viewpoints, the isocyanate index of the polyurethane foam composition is 95 or more, preferably 95 to 115, more preferably 98 to 110, and even more preferably 100 to 105. The isocyanate index is a value obtained by dividing the number of moles of isocyanate groups in an isocyanate by the total number of moles of active hydrogen groups such as hydroxyl groups in a polyol, and multiplying the value by 100, and is calculated by [NCO equivalent of isocyanate / active hydrogen equivalent x 100].

[0026] The isocyanate content is preferably 20 parts by mass or more and 60 parts by mass or less, more preferably 25 parts by mass or more and 55 parts by mass or less, and even more preferably 30 parts by mass or more and 40 parts by mass or less, based on 100 parts by mass of the total amount of polyol.

[0027] 1-4. Foaming agent The blowing agent may be water, a fluorocarbon substitute, or a hydrocarbon such as pentane, either alone or in combination. Water is particularly preferred as the blowing agent. When water is used, carbon dioxide gas is generated during the reaction of polyol with isocyanate, and the carbon dioxide gas is used to cause foaming.

[0028] The amount of water as a blowing agent is preferably 0.6 parts by mass or more and 2.4 parts by mass or less, more preferably 0.8 parts by mass or more and 2.2 parts by mass or less, and even more preferably 1.0 parts by mass or more and 2.0 parts by mass or less, based on 100 parts by mass of the total amount of polyol.

[0029] 1-5. Catalyst The catalyst is mainly for promoting the urethane reaction between polyols and polyisocyanates. The catalyst is preferably selected from the group consisting of known catalysts commonly used in polyurethane foams, such as tertiary amines such as triethylenediamine, 6-dimethylamino-1-hexanol, N,N-dimethylaminoethanol, and N,N',N'-trimethylaminoethylpiperazine, organometallic compounds such as stannous octoate and stannous octoate, acetates, and alkali metal alcoholates.

[0030] The content of triethylenediamine as a catalyst is preferably 0.6 parts by mass or more and 2.0 parts by mass or less, more preferably 0.8 parts by mass or more and 1.8 parts by mass or less, and even more preferably 1.0 parts by mass or more and 1.5 parts by mass or less, based on 100 parts by mass of the total amount of polyol.

[0031] 1-6.Foam stabilizer The polyol-containing composition preferably contains a foam stabilizer. Specifically, the foam stabilizer may be a silicone compound such as organopolysiloxane, organopolysiloxane-polyoxyalkylene copolymer, polyalkenylsiloxane having a polyoxyalkylene side chain, silicone-grease copolymer, or the like, an anionic surfactant such as sodium dodecylbenzenesulfonate or sodium lauryl sulfate, polyethersiloxane, or a phenolic compound. These foam stabilizers may be used alone or in combination of two or more kinds.

[0032] The amount of the foam stabilizer is not particularly limited, and is preferably 0.5 parts by mass or more and 3.5 parts by mass or less, more preferably 1.0 parts by mass or more and 3.0 parts by mass or less, and even more preferably 1.5 parts by mass or more and 2.5 parts by mass or less, based on 100 parts by mass of the total amount of the polyol.

[0033] 1-7.Other additives The polyurethane foam composition may contain other additives as appropriate, such as crosslinking agents, plasticizers, fillers, antioxidants, ultraviolet absorbers, defoamers, compatibilizers, colorants, stabilizers, antibacterial agents, antifungal agents, deodorizers, deodorants, fragrances, flavorings, etc. The crosslinking agent is preferably selected from the group consisting of short-chain diol crosslinking agents such as diethylene glycol, ethylene glycol, propylene glycol, dipropylene glycol, 1,4-butanediol, glycerin, and trimethylolpropane.

[0034] 1-8. Manufacturing method of polyurethane foam The polyurethane foam can be produced by a known foaming method in which the polyurethane foam composition is stirred and mixed to react the polyol and the polyisocyanate. The foaming method includes slab foaming and mold foaming, and slab foaming is preferred. Slab foaming is a method in which the mixed polyurethane resin composition is discharged onto a belt conveyer and foamed at atmospheric pressure and room temperature. On the other hand, mold foaming is a method in which the mixed polyurethane resin composition is filled into a mold (forming die) and foamed in the mold.

[0035] 1-9.Physical properties of polyurethane foam The physical properties of the polyurethane foam can be appropriately set depending on the application, etc. The polyurethane foam preferably has the following physical properties.

[0036] (1) Density (apparent density) The density of polyurethane foam (JIS K7222:2005) is 50kg / m 3 More than 65kg / m 3 Less than 52kg / m3 More than 60kg / m 3 Less than 54kg / m is preferable. 3 More than 56kg / m 3 The following is more preferred:

[0037] (2) Hardness (40% ILD hardness) The 40% ILD hardness (JIS K 6400-2 6.4 A method) of the polyurethane foam is preferably 68N or more and 90N or less, more preferably 70N or more and 80N or less, and even more preferably 72N or more and 75N or less.

[0038] (3) Resilience The impact resilience (JIS K 6400-3:2011) of the polyurethane foam is preferably 6% or more and 15% or less, more preferably 7% or more and 13% or less, and even more preferably 8% or more and 10% or less.

[0039] (4) Compressive residual strain The compression set of the polyurethane foam when compressed by 50% (JIS K6400-4 4.5.2 Method A) is preferably 1.5% to 3.5%, more preferably 2.0% to 3.2%, and even more preferably 2.5% to 3.0%.

[0040] 1-10. Biomass content of polyurethane foam The biomass degree of the polyurethane foam is preferably 5% or more and 30% or less, more preferably 8% or more and 25% or less, and even more preferably 10% or more and 20% or less. The biomass degree of the polyurethane foam can be calculated using the following formula (1).

[0041]

number

[0042] In formula (1), "plant-derived content of plant-derived polyol" is the proportion of plant-derived materials among the raw materials. In formula (1), "total number of parts added of polyurethane foam composition" is the total number of parts added of all raw materials of polyurethane foam composition. All raw materials include plant-derived polyol, petroleum-derived polyol, isocyanate, blowing agent, catalyst, etc. The units of "number of parts added of plant-derived polyol" and "total number of parts added of polyurethane foam composition" are parts by mass. The unit of "plant-derived content of plant-derived polyol" is %.

[0043] 1-11. Uses of polyurethane foam Polyurethane foams are used, for example, in bedding such as pillows, mattresses, and futons.

[0044] 1-12. Effects of the First Embodiment From the perspective of SDGs (Sustainable Development Goals) and carbon neutrality, there is a demand for polyurethane foams made from plant-derived raw materials. However, when switching from petroleum-derived raw materials to plant-derived raw materials, reactivity and physical properties are affected by impurities, etc.

[0045] Therefore, by adopting the above-mentioned configuration in the polyurethane foam of the first embodiment, it is possible to provide a polyurethane foam obtained from a composition containing raw materials derived from plants and having desired physical properties (specifically, low resilience, etc.).

[0046] 2. Polyurethane foam of the second embodiment The density (JIS K 7222) of the polyurethane foam of the second embodiment is 50 kg / m 3 More than 65kg / m 3 The hardness of the polyurethane foam (JIS K 6400-2 6.4 A method) is 90N or less. The impact resilience of the polyurethane foam (JIS K 6400-3:2011) is 15% or less. The biomass content of the polyurethane foam is 5% or more and 30% or less.

[0047] The polyurethane foam is preferably obtained from a polyurethane foam composition comprising a polyol, an isocyanate, a blowing agent, and a catalyst. The polyol preferably comprises a petroleum-derived polyol.

[0048] 2-1. Citation of the description of the polyurethane foam of the first embodiment With regard to the polyurethane foam composition, the explanations in the section "Polyurethane foam of the first embodiment" for "petroleum-derived polyol," "blowing agent," "catalyst," "foam stabilizer," "other additives," "method of producing polyurethane foam," and "uses of polyurethane foam" apply as is, and the description thereof is omitted. In other words, the explanations in the section "Polyurethane foam of the first embodiment" for "petroleum-derived polyol," "blowing agent," "catalyst," "foam stabilizer," "other additives," "method of producing polyurethane foam," and "uses of polyurethane foam" apply as is.

[0049] 2-1-2.Plant-derived polyols For the plant-derived polyol, the descriptions other than the content of the "plant-derived polyol" explained in the section "Polyurethane foam of the first embodiment" apply as is.

[0050] When the total amount of polyol is 100 parts by mass, the plant-derived polyol is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and even more preferably 14 parts by mass or more, from the viewpoint of increasing the plant content. When the total amount of polyol is 100 parts by mass, the plant-derived polyol is preferably 50 parts by mass or less, more preferably 18 parts by mass or less, and even more preferably 16 parts by mass or less, from the viewpoint of ensuring low resilience. From these viewpoints, when the total amount of polyol is 100 parts by mass, the plant-derived polyol is preferably 5 parts by mass or more and 50 parts by mass or less, more preferably 10 parts by mass or more and 18 parts by mass or less, and even more preferably 14 parts by mass or more and 16 parts by mass or less.

[0051] 2-1-3. Isocyanate Regarding the isocyanate, the descriptions in the section "Polyurethane foam of the first embodiment" for "Isocyanate" apply as is, except for the description of the isocyanate index.

[0052] From the viewpoints of ensuring mechanical strength (tensile strength) and hardness, the isocyanate index of the composition for polyurethane foam is preferably 95 or more, more preferably 98 or more, and even more preferably 100 or more. From the viewpoints of preventing the composition for polyurethane foam from becoming too hard and suppressing the generation of reaction heat, the isocyanate index of the composition for polyurethane foam is preferably 115 or less, more preferably 110 or less, and even more preferably 105 or less. From these viewpoints, the isocyanate index of the composition for polyurethane foam is preferably 95 or more and 115 or less, more preferably 98 or more and 110 or less, and even more preferably 100 or more and 105 or less.

[0053] 2-2.Physical properties of polyurethane foam The physical properties of the polyurethane foam can be appropriately set depending on the application, etc. The polyurethane foam preferably has the following physical properties.

[0054] (1) Density (apparent density) The density of polyurethane foam (JIS K7222:2005) is 50kg / m 3 More than 65kg / m 3 Less than 52kg / m 3 More than 60kg / m 3 Less than 54kg / m is preferable. 3 More than 56kg / m 3 The following is more preferred:

[0055] (2) Hardness (40% ILD hardness) The 40% ILD hardness (JIS K 6400-2 6.4 A method) of the polyurethane foam is 90N or less, preferably 68N or more and 80N or less, more preferably 70N or more and 78N or less, and even more preferably 72N or more and 75N or less.

[0056] (3) Resilience The impact resilience (JIS K 6400-3:2011) of the polyurethane foam is 15% or less, preferably 6% or more and 15% or less, more preferably 7% or more and 13% or less, and even more preferably 8% or more and 10% or less.

[0057] (4) Compressive residual strain The compression set of the polyurethane foam when compressed by 50% (JIS K6400-4.5.2 Method A) is preferably 1.5% to 3.5%, more preferably 2.0% to 3.2%, and even more preferably 2.5% to 3.0%.

[0058] 2-3. Biomass content of polyurethane foam The biomass degree of the polyurethane foam is 5% or more and 30% or less, preferably 8% or more and 25% or less, and more preferably 10% or more and 20% or less. The biomass degree of the polyurethane foam can be calculated using the above formula (1).

[0059] 2-3. Effects of the second embodiment By adopting the above-mentioned configuration, the polyurethane foam of the second embodiment can be obtained from a composition containing raw materials derived from plants and can provide a polyurethane foam having desired physical properties (specifically, low resilience, etc.). EXAMPLES

[0060] The present invention will be described more specifically below with reference to examples.

[0061] 1. Preparation of Polyurethane Foam Polyurethane foams of Examples 1-8 and Comparative Examples 1-4 were produced according to the blending ratios shown in Table 1. In Table 1, the blending ratios are expressed in parts by mass when the polyol is taken as 100 parts by mass.

[0062] [Table 1]

[0063] Details of the raw materials for the polyurethane foam in Table 1 are shown below. Polyol 1: Polyether polyol, product name: GP-750K (manufactured by Sanyo Chemical Industries, Ltd.), OHV: 220 mg KOH / g, number of functional groups: 3, weight average molecular weight: 750 Polyol 2: Polyether polyol, product name: PP-2000NS (manufactured by Sanyo Chemical Industries, Ltd.), OHV: 56.1 mg KOH / g, number of functional groups: 2, weight average molecular weight: 2000 Polyol 3: Polyether polyol, product name: F-3140 (manufactured by Manka Chemical Japan Co., Ltd.), OHV: 41 mg KOH / g, number of functional groups: 3, weight average molecular weight: 4000, EO content: 80% Polyol 4: Castor oil-based polyol, product name: DR (Toyokuni Oil Mills), OHV: 160 mg KOH / g, number of functional groups: 2.7, weight average molecular weight: 947, plant content: 100% Polyol 5: Castor oil-based polyol, product name: H-30 (manufactured by Ito Oil Co., Ltd.), OHV: 160 mg KOH / g, number of functional groups: 2.7, weight average molecular weight: 947, plant content: 100% Catalyst: Amine catalyst, product name: DABCO 33LSI (manufactured by Evonik Japan), OHV: 982 mg KOH / g Foam stabilizer: Silicone foam stabilizer, product name: B-8239F (manufactured by Evonik Japan) Additives: Crosslinking agent, Product name: DPG (ADEKA), OHV: 836mgKOH / g Foaming agent: Water Isocyanate: Toluene diisocyanate (TDI), product name: Cosmonate T-80 (manufactured by Mitsui Chemicals), consisting of 2,4-TDI and 2,6-TDI in a molar ratio of 80:20

[0064] 2. Physical property evaluation (2-1) Density (apparent density) The density was measured using JIS K7222:2005. The density was evaluated according to the following criteria. "A": 50kg / m 3 More than 65kg / m 3 below "B": 50kg / m 3Less than or equal to 65kg / m 3 Greater than

[0065] (2-2) Hardness (40% ILD hardness) The hardness (40% ILD hardness) was measured using JIS K 6400-2 6.4 A method. The hardness was evaluated according to the following criteria. "A": 90N or less "B": greater than 90N

[0066] (2-3) Rebound elasticity The impact resilience was measured using JIS K6400-3:2011. The evaluation of the rebound resilience was based on the following criteria. "A": 15% or less "B": Greater than 15%

[0067] (2-4) Compressive residual strain The compression set at 50% compression was measured using JIS K6400-4 4.5.2: Method A.

[0068] (2-5) Biomass ratio The biomass degree was calculated using the above formula (1).

[0069] 3.Results The results are shown in Table 1. As shown in Table 1, in the polyurethane foam of Example 1-8, the polyurethane foam composition contained a plant-derived polyol (castor oil-based polyol), but the density was rated "A" and the rebound resilience was rated "A". In the polyurethane foam of Comparative Example 1, the polyurethane foam composition did not contain a plant-derived polyol (castor oil-based polyol), and the density was rated "A" and the rebound resilience was rated "A". Therefore, in Example 1-8, low rebound properties similar to those of Comparative Example 1, in which the polyurethane foam composition did not contain a plant-derived polyol (castor oil-based polyol), were obtained.

[0070] As shown in Table 1, the polyurethane foam of Example 2-8 had a density evaluation of "A", a hardness evaluation of "A", and a rebound resilience evaluation of "A". The polyurethane foam of Example 1 had a density evaluation of "A", a hardness evaluation of "B", and a rebound resilience evaluation of "A". Therefore, in Examples 4-8, by adjusting the blending ratio of polyol, etc. compared to Examples 1-3, good low rebound properties with more preferable hardness were obtained.

[0071] 4. Effects of the embodiment According to the above examples, a polyurethane foam having low resilience was obtained from a polyurethane foam composition containing a plant-derived raw material. Specifically, a part of the polyol could be replaced with a plant-derived raw material while maintaining the physical properties (low resilience, etc.). In addition, by adjusting the blending ratio of the polyol, etc., a polyurethane foam having the desired physical properties could be realized.

[0072] The present disclosure is not limited to the above-described embodiments, and various modifications and variations are possible.

Claims

1. The polyurethane foam is obtained from a composition for polyurethane foam including a polyol, an isocyanate, a blowing agent, and a catalyst. The polyurethane foam composition has an isocyanate index of 95 or more, The polyol comprises a plant-derived polyol, the plant-derived polyol is present in an amount of 5 parts by mass or more and 50 parts by mass or less, relative to 100 parts by mass of the total amount of the polyol; Density (JIS K 7222) is 50 kg / m ３ 65kg / m or more ３ Below is a polyurethane foam.

2. The polyurethane foam according to claim 1, having a hardness (JIS K 6400-2 6.4 A method) of 90 N or less.

3. The polyurethane foam according to claim 1 or 2, having a rebound resilience (JIS K 6400-3:2011) of 15% or less.

4. Density (JIS K 7222) is 50 kg / m ３ 65kg / m or more ３ is as follows: Hardness (JIS K 6400-2 6.4 A method) is 90N or less, The impact resilience (JIS K 6400-3:2011) is 15% or less. A polyurethane foam having a biomass ratio of 5% or more and 30% or less.

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