Polyurethane foam

Abstract

The purpose of the present invention is to provide a polyurethane foam which has excellent drying properties after washing and is suitable for articles to be washed, such as bedding articles such as mattresses or pillows, furniture such as cushions for cushions, clothes such as brassiere pads for underwear, and the like. The polyurethane foam is obtained from a polyurethane foam composition containing a polyol component, a polyisocyanate, and a foaming agent, in which the polyol component contains a plant-derived polyol, and the biomass content measured according to ASTM D6866-20 is 24% or more.

Description

[0001] This application is a divisional application of the Chinese invention patent application with application date of October 18, 2021, application number 202180103415.X, and name “Polyurethane Foam”. Technical Field

[0002] An object of the present invention is to provide a polyurethane foam having good drying properties after washing. Background Art

[0003] Polyurethane foam is formed from a polyurethane foam composition containing a polyol component, an isocyanate, and a foaming agent, and is widely used as bedding, clothing, and the like (Patent Documents 1, 2, and 3).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2005-270146

[0007] Patent Document 2: Japanese Patent Application Publication No. 2019-17948

[0008] Patent Document 3: Japanese Patent Application Publication No. 2019-203061 Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, since polyurethane foam is composed of a fine cell (cell) structure, it has a problem of high water retention and poor drying properties after washing.

[0011] An object of the present invention is to provide a polyurethane foam having good drying properties after washing.

[0012] Means of solving problems

[0013] The present invention is characterized by a polyurethane foam having a biomass content of 24% or more as measured according to ASTM D6866-20.

[0014] Effects of the Invention

[0015] The polyurethane foam of the present invention has a biomass content of 24% or more as measured in accordance with ASTM D6866-20, whereby drying properties after washing become good.

[0016] Biomass content refers to the proportion of natural raw materials contained in a product. The biomass content of a product can be measured by measuring how much radioactive carbon C14 is contained in the product, which only exists in natural sources.

[0017] The biomass content in the present invention is obtained by measuring the C14 concentration of the polyurethane foam by accelerator mass spectrometry (AMS method) based on ASTM D6866-20, and calculating the ratio (%) of the C14 concentration relative to the current 100% natural source material. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a table showing the formulations, physical properties, and measurement results of post-wash drying properties of each Example and each Comparative Example of the present invention.

[0019] Figure 2 It is a table showing the content of each program of the detergency test.

[0020] Figure 3 This is a table showing the results of the drying test. DETAILED DESCRIPTION

[0021] Since the polyurethane foam of the present invention has a biomass content of 24% or more as measured by accelerator mass spectrometry (AMS method) based on ASTM D6866-20, drying properties after washing are good and drying time can be shortened.

[0022] Polyurethane foams are available in hard, semi-hard, and soft types, and can be selected according to the application. For example, soft polyurethane foams are widely used in bedding such as mattresses or clothes such as breast pads of underwear. The polyurethane foam of the present invention can include any of hard, semi-hard, and soft polyurethane foams.

[0023] The polyurethane foam of the present invention can be obtained from a polyurethane foam composition containing a polyol component, a polyisocyanate and a foaming agent. The polyurethane foam composition is mixed and stirred to react the polyol component with the polyisocyanate and foam to form a polyurethane foam.

[0024] The polyol component contains a polyol, which is a compound having two or more hydroxyl groups in one molecule. The polyol component contains a plant-derived polyol. The plant-derived polyol is a polyol produced using a plant-derived raw material such as a vegetable oil.

[0025] Examples of the vegetable oil include castor oil, sunflower oil, rapeseed oil, linseed oil, cottonseed oil, tung oil, coconut oil, corn oil, and soybean oil. Among them, castor oil polyol produced using castor oil as a raw material is a preferred example of a plant-derived polyol.

[0026] The castor oil polyol may be either a modified castor oil polyol or an unmodified castor oil polyol, or may contain both.

[0027] Examples of modified castor oil polyols include transesterification products of castor oil and fats other than castor oil, transesterification products of castor oil and fat fatty acids, transesterification products of castor oil and polyols, esterification products of castor oil fatty acids and polyols, esterification products of a part of hydroxyl groups contained in castor oil and monocarboxylic acids such as acetic acid, products obtained by addition polymerization of alkylene oxides to the above chemical substances, and hydrogenated products obtained by adding hydrogen to the above chemical substances.

[0028] Examples of the unmodified castor oil polyol include purified castor oil polyol, semi-refined castor oil polyol, and unrefined castor oil polyol.

[0029] The number of functional groups of the plant-derived polyol is preferably 2 to 3.5, the hydroxyl value is preferably 40 to 180 mgKOH / g, and the molecular weight is preferably 724 to 2931, and one or more kinds may be used.

[0030] The amount of plant-derived polyol is determined so that the biomass content measured according to ASTM D6866-20 is 24% or more, but is preferably 15 parts by mass or more, more preferably 30 parts by mass or more, and further preferably 80 parts by mass or more in 100 parts by mass of the polyol component. The polyol component may also contain a petroleum-derived polyol. By containing a petroleum-derived polyol, moldability and productivity become good.

[0031] The petroleum-derived polyol may be any one of polyether polyol, polyester polyol, polyether ester polyol, etc., or one or more of them may be used.

[0032] Examples of the polyether polyol include polyether polyols obtained by adding alkylene oxides such as ethylene oxide and propylene oxide to polyols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, and sucrose.

[0033] Examples of the polyester polyol include polyester polyols obtained by polycondensation of an aliphatic carboxylic acid or an aromatic carboxylic acid with an aliphatic diol, wherein the aliphatic carboxylic acid is malonic acid, succinic acid, adipic acid, etc., the aromatic carboxylic acid is phthalic acid, etc., and the aliphatic diol is ethylene glycol, diethylene glycol, propylene glycol, etc.

[0034] Examples of the polyetherester polyol include a polyol obtained by polyesterification by reacting a polyether polyol with a polybasic acid, and a polyol having two segments of a polyether and a polyester in one molecule.

[0035] The petroleum-derived polyol preferably has a functional group number of 2.0 to 3.5, a hydroxyl value of 15 to 1000 mgKOH / g, and a molecular weight of 100 to 10,000.

[0036] The polyisocyanate is not particularly limited and may be any of aromatic, alicyclic, and aliphatic types. It may also be a bifunctional isocyanate having two isocyanate groups in one molecule, or a trifunctional or higher isocyanate having three or more isocyanate groups in one molecule. These may be used alone or in combination.

[0037] Examples of the bifunctional polyisocyanate include 2,4-toluene diisocyanate (2,4-TDI), 2,6-toluene diisocyanate (2,6-TDI), m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate (4,4'-MDI), 2,4'-diphenylmethane diisocyanate (2,4'-MDI), 2,2'-diphenylmethane diisocyanate (2,2'-MDI), xylene diisocyanate, 3,3 '-dimethyl-4,4'-biphenyl diisocyanate, 3,3'-dimethoxy-4,4'-biphenyl diisocyanate and other aromatic substances, cyclohexane-1,4-diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, methylcyclohexane diisocyanate and other alicyclic bifunctional polyisocyanates, and butane-1,4-diisocyanate, hexamethylene diisocyanate, isopropyl diisocyanate (isopropylene diisocyanate), methylene diisocyanate, lysine diisocyanate and other aromatic bifunctional polyisocyanates. It should be noted that diphenylmethane diisocyanate (MDI) can also be used together with various types of polymeric MDI and prepolymers of polymeric MDI.

[0038] Examples of trifunctional or higher-functional polyisocyanates include 1-methylbenzene-2,4,6-triisocyanate, 1,3,5-trimethylbenzene-2,4,6-triisocyanate, biphenyl-2,4,4′-triisocyanate, diphenylmethane-2,4,4,4′-triisocyanate, methyldiphenylmethane-4,6,4′-triisocyanate, 4,4′-dimethyldiphenylmethane-2,2′,5,5′-tetraisocyanate, and triphenylmethane-4,4′,4″-triisocyanate.

[0039] The isocyanate index (INDEX) is preferably 70 to 150, more preferably 80 to 130, and most preferably 90 to 120. When the isocyanate index is less than 70, the foaming moldability deteriorates. On the other hand, when the isocyanate index exceeds 150, the foam becomes too hard and brittle, so that the durability deteriorates. The isocyanate index is a value obtained by dividing the number of moles of isocyanate groups in the polyisocyanate by the total number of moles of active hydrogen groups such as hydroxyl groups of the polyol component or water as a foaming agent, and then multiplying the value by 100, and is calculated by [NCO equivalent of polyisocyanate / active hydrogen equivalent × 100].

[0040] The foaming agent may include water, hydrocarbons, halogen compounds, etc., which may be one of them or more than two. As hydrocarbons, cyclopentane, isopentane, n-pentane, etc. may be mentioned. In addition, as halogen compounds, dichloromethane, trichlorofluoromethane, dichlorodifluoromethane, nonafluorobutyl methyl ether, nonafluorobutyl ethyl ether, pentafluoroethyl methyl ether, heptafluoroisopropyl methyl ether, etc. may be mentioned. Among them, as a foaming agent, water is particularly preferably used. Water may be any one of ion exchange water, tap water, distilled water, etc. When the polyol component is 100 parts by mass, the amount of water used as a foaming agent is 0.5 to 10 parts by mass, preferably 1 to 8 parts by mass, and more preferably 1.5 to 5 parts by mass.

[0041] A catalyst and an auxiliary agent are appropriately blended as other components in the polyol composition.

[0042] The catalyst used for polyurethane foam can use known substances, and there is no particular limitation. As usable catalysts, for example, amine catalysts such as triethylamine, triethylenediamine and tetramethylguanidine, tin catalysts such as dibutyltin dilaurate and stannous octoate, and metal catalysts (also called organometallic catalysts) such as phenylmercuric propionate or lead octenate can be cited. The total amount of the catalyst is appropriately determined according to the type of the catalyst, and is generally 0.01 to 3.0 parts by mass, preferably 0.02 to 1.5 parts by mass, and more preferably 0.05 to 1.2 parts by mass relative to 100 parts by mass of the polyol component.

[0043] Examples of the auxiliary agent include a foam stabilizer, a cross-linking agent, a colorant, a flame retardant, an antibacterial agent, a stabilizer, and a plasticizer.

[0044] As the foam stabilizer for polyurethane foam, known substances can be used, and silicone foam stabilizers, fluorine-containing compound foam stabilizers and surfactants can be mentioned. Silicone foam stabilizers are particularly preferred foam stabilizers. As silicone foam stabilizers, silicone foam stabilizers composed of siloxane chains as a whole, silicone foam stabilizers with linear structures of siloxane chains and polyether chains, silicone foam stabilizers with branches and branches, silicone foam stabilizers with polyether chains modified into pendant shapes on siloxane chains, etc. can be mentioned.

[0045] Examples of the crosslinking agent include polyols such as ethylene glycol, diethylene glycol, glycerin, butanetetraol, and polyoxypropylene glycol, diethanolamine, and polyamines. These can be used alone or in combination of two or more.

[0046] Polyurethane foams include slab foamed articles and molded foamed articles, and the polyurethane foam of the present invention may be either one.

[0047] Block foam products are obtained by mixing and stirring a polyurethane foam composition and discharging it onto a conveyor belt, where it is foamed to continuously form polyurethane foam, and then cut into foam products of a specified size. In contrast, molded foam products are obtained by injecting a polyurethane foam composition into a mold and foaming it, and have an outer shape corresponding to the inner surface shape of the mold.

[0048] The polyurethane foam of the present invention may be a polyurethane foam having cell membranes that have not been subjected to a film removal treatment, or may be a polyurethane foam in which a film removal treatment has been performed to remove the cell membranes.

[0049] The film removal treatment is a well-known treatment for removing the unit film of polyurethane foam, and the film removal treatment includes a method of immersing the polyurethane foam in an alkaline solution to melt the unit film, or a method such as containing the polyurethane foam in a sealed container, filling the sealed container with a combustible gas such as oxygen, and then igniting it to cause an explosion, thereby destroying the unit film.

[0050] Example

[0051] The embodiments of the present invention are described in detail together with comparative examples. Figure 1 The polyurethane foam compositions of each embodiment and each comparative example of the formulation shown in the table are stirred and mixed, and foamed to produce the polyurethane foams of each embodiment and each comparative example. It should be noted that Comparative Example 1 and Examples 1 to 3 are block foam products, and Comparative Example 2 and Example 4 are molded foam products. In addition, regarding Example 2, the polyurethane foam of Example 1 is subjected to a de-filming treatment by explosion to remove the cell film, and the rest is the same as Example 1 except for the presence or absence of the cell film.

[0052] <Polyol component>

[0053] Plant-derived polyol 1: Unmodified (refined) castor oil polyol, 100% plant-derived, 2.7 functional groups, 160 mgKOH / g hydroxyl value, 947 molecular weight, product name: H-30, manufactured by Ito Oil Manufacturing Co., Ltd.

[0054] Plant-derived polyol 2: 100 parts by mass of purified castor oil and 10.9 parts by mass of sebacic acid were reacted while stirring, and the plant-derived 100% castor oil polyol was composed of purified castor oil / sebacic acid = 2 / 1 mole, with a functional group number of 3.5, a hydroxyl value of 86 mgKOH / g, and a molecular weight of 2182

[0055] Petroleum-derived polyol 1: Functional group number: 3, hydroxyl value: 24.1 mgKOH / g, molecular weight: 6983.4, product name: KC737, manufactured by Sanyo Chemical Industries, Ltd.

[0056] Petroleum-derived polyol 2: Functional group number: 3, hydroxyl value: 56.1 mgKOH / g, molecular weight: 3000, product name: EP505S, manufactured by Mitsui Chemicals, Inc.

[0057] Petroleum-derived polyol 3: polyether polyol, functional group number 3, hydroxyl value 56.1 mgKOH / g, molecular weight 3000, product name: GP-3050NS, manufactured by Sanyo Chemical Industries, Ltd.

[0058] Petroleum-derived polyol 4: Functional group number: 3, hydroxyl value: 31 mgKOH / g, molecular weight: 5429, product name: Y-7530, manufactured by Mitsui Chemicals SKC Polyurethane Co., Ltd.

[0059] <Cross-linking agent>

[0060] Diethylene glycol

[0061] <Foaming agent>

[0062] ·water

[0063] <Amine Catalyst>

[0064] Amine catalyst 1: Aliphatic tertiary amine composition, product name: DABCO 33LSI, manufactured by Evonik Japan

[0065] Amine catalyst 2: Product name: 2Mabs, manufactured by Nippon Emulsifier Co., Ltd.

[0066] <Foam stabilizer>

[0067] Foam stabilizer 1: Silicone, product name: SZ1136, manufactured by Toray Dow Corning Co., Ltd.

[0068] Foam stabilizer 2: Silicone-based, product name: L-594Plus, manufactured by Evonik Japan

[0069] Foam stabilizer 3: Silicone series, product name: L3184J, Momentive Advanced Materials Japan Co., Ltd.

[0070] <Metal Catalyst>

[0071] Stannous octoate, product name: MRH-110, manufactured by Johoku Chemical Industry Co., Ltd.

[0072] <Polyisocyanate>

[0073] · Polyisocyanate 1: 2,4-TDI / 2,6-TDI=80 / 20 toluene diisocyanate, product name: Coronate T-80, manufactured by Tosoh Corporation

[0074] Polyisocyanate 2: 2,4-TDI / 2,6-TDI=65 / 35 toluene diisocyanate, product name: Coronate T-65, manufactured by Tosoh Corporation

[0075] Polyisocyanate 3: Monomeric MDI (a mixture of 4,4'-MDI and 2,4-MDI. The ratio of 2,4-MDI is 25-50%)

[0076] The biomass content, physical properties and drying properties after washing of the polyurethane foams of each embodiment and each comparative example were measured. Figure 1 shown.

[0077] The biomass content (plant content) refers to both a value measured by accelerator mass spectrometry (AMS method) based on ASTM D6866-20 and a value calculated.

[0078] In ASTM D6866, the carbon 14 concentration of the standard material and the data of the carbon 14 concentration in the atmosphere in 1950 are measured, and the ratio is defined as the biomass content. However, since the carbon 14 concentration in the atmosphere is increasing year by year, it is stipulated that the value is multiplied by a coefficient for correction. In the calculation according to ASTM D6866-20, the biomass content is calculated using the atmospheric correction coefficient REF (pMC) = 100.0 in 2020.

[0079] The biomass content was evaluated based on the measured value of the AMS method. The evaluation criteria were set as "◎" when the measured value based on the AMS method was 50% or more, "○" when the measured value based on the AMS method was 24 to less than 50%, and "×" when the measured value based on the AMS method was less than 24%.

[0080] The calculated value is obtained by the following calculation formula: Biomass content = number of plant polyols added / (total number of added parts - gas loss) Gas loss = number of water added / 18 × 44

[0081] In the above gas loss calculation formula, "18" is the molecular weight of water, and "44" is the molecular weight of carbon dioxide.

[0082] Regarding physical properties, density (JIS K7222), 25% hardness (JIS K6400-2 6.7D method), number of cells (JIS K6400-1), air permeability (JIS K6400-7A method), tensile strength (JIS K6400-5 5), elongation (JIS K6400-5 5), tear strength (JIS K6400-5 6B), dry heat deformation (JIS K6400-4 4.5.2A method), and rebound (JIS K6400-3) were measured.

[0083] Regarding the drying property after washing, the water absorption after washing, the water absorption after dehydration, and the water absorption after drying for 24 hours were measured using the following method, and the water absorption after washing, the dehydration after washing, the drying property after washing, and the comprehensive evaluation of the drying property after washing were evaluated based on the measurement results. It should be noted that compared with the block foam product, the molded foam product has a surface layer, which makes it difficult for water to drain, so the block foam product and the molded foam product were evaluated for water absorption after washing, dehydration after washing, drying property after washing, and comprehensive evaluation of drying property after washing.

[0084] Regarding the water absorption after washing, a vertical washing machine was used to perform the following tests on the samples of each embodiment and each comparative example: Figure 2 The weight of the sample is measured and the water absorption rate is calculated at the end of each washing process for the first, second and third washing processes shown in the figure, and the water absorption rate after the third washing process is set as the water absorption rate after washing. The water absorption rate after each washing process is calculated according to the following calculation formula.

[0085] Water absorption rate (%) = (weight of sample after each washing process - weight of sample before washing) / (weight of sample before washing) × 100

[0086] The values ​​of water absorption at each time are as follows Figure 3 It should be noted that "before washing" means before the first washing program starts.

[0087] The water absorption after washing was evaluated according to the following standards. For Comparative Example 1 and Examples 1 to 3 of the block foam product, when the water absorption after washing was less than 160%, it was set as "◎", when the water absorption after washing was 160 to less than 200%, it was set as "○", and when the water absorption after washing was more than 200%, it was set as "×". For Comparative Example 2 and Example 4 of the molded foam product, when the water absorption after washing was less than 95%, it was set as "◎", when the water absorption after washing was 95 to less than 100%, it was set as "○", and when the water absorption after washing was more than 100%, it was set as "×".

[0088] Regarding the water absorption rate after dehydration, after the third washing program, Figure 2The first dehydration program and the second dehydration program shown in the figure, at the end of each dehydration program, the weight of the sample is measured and the water absorption is calculated, and the water absorption after the second dehydration program is set as the water absorption after dehydration. The water absorption after each dehydration program is calculated according to the following calculation formula.

[0089] Water absorption rate (%) = (weight of sample after each dehydration process - weight of sample before washing) / (weight of sample before washing) × 100

[0090] The water absorption value after each dehydration process is as follows Figure 3 shown.

[0091] The dehydration after washing was evaluated according to the following criteria. For Comparative Example 1 and Examples 1 to 3 of the block foam product, when the water absorption after dehydration is less than 120%, it is set as "◎", when the water absorption after dehydration is 120 to less than 185%, it is set as "○", and when the water absorption after dehydration is more than 185%, it is set as "×". For Comparative Example 2 and Example 4 of the molded foam product, when the water absorption after dehydration is less than 90%, it is set as "◎", when the water absorption after dehydration is 90 to less than 95%, it is set as "○", and when the water absorption after dehydration is more than 95%, it is set as "×".

[0092] Regarding the water absorption after drying for 24 hours, the sample after the second dehydration process is placed at room temperature (20-28°C is called room temperature) for 24 hours, and then the water absorption is calculated based on the weight of the sample. The water absorption after drying for 24 hours is obtained according to the following calculation formula.

[0093] Water absorption after drying for 24 hours (%) = (weight of sample after standing for 24 hours - weight of sample before washing) / (weight of sample before washing) × 100

[0094] The water absorption value after drying for 24 hours is as follows Figure 3 shown.

[0095] The evaluation of drying after washing was carried out according to the following criteria. For Comparative Example 1 and Examples 1 to 3 of block foam products, "◎" was set when the water absorption was less than 1% after drying for 24 hours, "○" was set when the water absorption was 1 to less than 3% after drying for 24 hours, and "×" was set when the water absorption was more than 3% after drying for 24 hours. For Comparative Example 2 and Example 4 of molded foam products, "◎" was set when the water absorption was less than 5% after drying for 24 hours, "○" was set when the water absorption was 5 to less than 10% after drying for 24 hours, and "×" was set when the water absorption was more than 10% after drying for 24 hours.

[0096] Regarding the comprehensive evaluation of washing and drying properties, when the water absorption evaluation after washing, the water dehydration evaluation after washing, and the drying property evaluation after washing are only "◎" or only consist of "◎" and "○", the comprehensive evaluation of washing and drying properties is set to "◎"; when the water absorption evaluation after washing, the water dehydration evaluation after washing, and the drying property evaluation after washing are all "○", the comprehensive evaluation of washing and drying properties is set to "○"; when even one of the water absorption evaluation after washing, the water dehydration evaluation after washing, and the drying property evaluation after washing is "×", the comprehensive evaluation of washing and drying properties is also set to "×".

[0097] <Results of Comparative Example 1 and Examples 1 to 3 of Block Foam Products>

[0098] Comparative Example 1

[0099] Comparative Example 1 is an example in which the polyol component is 100 parts by mass of the petroleum-derived polyol 3 and the vegetable oil-derived polyol is 0 parts by mass.

[0100] In Comparative Example 1, the biomass content based on the AMS method was 1%, the biomass content was evaluated as "×", the calculated biomass content was 0%, the water absorption after washing was 248.4%, the water absorption after washing was evaluated as "×", the water absorption after dehydration was 193.3%, the dehydration after washing was evaluated as "×", the water absorption after drying for 24 hours was 3.95%, the drying after washing was evaluated as "×", and the comprehensive drying after washing was evaluated as "×".

[0101] Example 1

[0102] Example 1 is an example in which the polyol component composition is 60 parts by mass of the plant-derived polyol 1, 20 parts by mass of the vegetable oil-derived polyol 2, and 20.45 parts by mass of the petroleum-derived polyol 3.

[0103] In Example 1, the biomass content based on the AMS method is 58%, and the biomass content is evaluated as "◎", the calculated biomass content is 53%, the water absorption after washing is 169.9%, and the water absorption after washing is evaluated as "○", the water absorption after dehydration is 137.0%, and the dehydration after washing is evaluated as "○", the water absorption after drying for 24 hours is 0.06%, and the drying after washing is evaluated as "◎", any one of the water absorption after washing, the water absorption after dehydration, and the water absorption after drying for 24 hours is less than that of Comparative Example 1, and the comprehensive evaluation of drying after washing is "◎".

[0104] Example 2

[0105] Example 2 is an example in which a polyurethane foam is subjected to a film removal treatment and a cell film is removed. The polyurethane foam is formed from a polyol composition having the same formulation as that of Example 1.

[0106] Example 2 showed the same physical properties and biomass content as those of Example 1 having the same polyol composition formulation, and the biomass content based on the AMS method was 57%, the biomass content evaluation was "◎", and the calculated biomass content was 53%.

[0107] In Example 2, the water absorption after washing was 136.0%, and the water absorption after washing was evaluated as "◎", the water absorption after dehydration was 107.2%, and the dehydration after washing was evaluated as "◎", and the water absorption after 24 hours of drying was 0.06%, and the drying after washing was evaluated as "◎", and any one of the water absorption after washing, the water absorption after dehydration, and the water absorption after drying for 24 hours was less than that of Comparative Example 1, and the comprehensive evaluation of drying after washing was "◎". It should be noted that by removing the cell membrane of the polyurethane foam, the water absorption after washing and the water absorption after dehydration were less than those of Example 1, and the drying was good.

[0108] Example 3

[0109] Example 3 is an example in which the polyol component composition is 37 parts by mass of the plant-derived polyol 1 and 63 parts by mass of the petroleum-derived polyol 4.

[0110] In Example 3, the biomass content based on the AMS method was 28%, and the biomass content was evaluated as "○", the calculated biomass content was 26%, the water absorption after washing was 197.1%, and the water absorption after washing was evaluated as "○", the water absorption after dehydration was 184.7%, and the dehydration after washing was evaluated as "○", the water absorption after drying for 24 hours was 1.77%, and the drying after washing was evaluated as "○", any one of the water absorption after washing, the water absorption after dehydration, and the water absorption after drying for 24 hours was less than that of Comparative Example 1, and the comprehensive evaluation of drying after washing was "○".

[0111] <Results of Comparative Example 2 and Example 4 of Molded Foamed Articles>

[0112] Comparative Example 2

[0113] Comparative Example 2 is an example in which the polyol component composition includes 70 parts by mass of petroleum-derived polyol 1, 10 parts by mass of petroleum-derived polyol 2, and 20 parts by mass of petroleum-derived polyol 3, and 0 parts by mass of vegetable oil-derived polyol.

[0114] In Comparative Example 2, the calculated biomass content was 0%, the water absorption after washing was 115.6%, the water absorption after washing was evaluated as "×", the water absorption after dehydration was 96.4%, the dehydration after washing was evaluated as "◎", the water absorption after 24 hours of drying was 13.7%, the drying after washing was evaluated as "×", and the comprehensive drying after washing was evaluated as "×".

[0115] Example 4

[0116] Example 4 is an example in which the polyol component composition is 22 parts by mass of the plant-derived polyol 1, 17 parts by mass of the plant oil-derived polyol 2, 51 parts by mass of the petroleum-derived polyol 1, and 10 parts by mass of the petroleum-derived polyol 2.

[0117] In Example 4, the biomass content based on the AMS method is 27%, and the biomass content is evaluated as "○", the calculated biomass content is 23%, the water absorption after washing is 94.0%, and the water absorption after washing is evaluated as "◎", the water absorption after dehydration is 87.5%, and the dehydration after washing is evaluated as "◎", the water absorption after drying for 24 hours is 4.1%, and the drying after washing is evaluated as "◎", any one of the water absorption after washing, the water absorption after dehydration, and the water absorption after drying for 24 hours is less than that of Comparative Example 2, and the comprehensive evaluation of drying after washing is "◎".

[0118] Thus, the polyurethane foam of the present invention has good drying properties after washing.

[0119] It should be noted that the present invention is not limited to the embodiments, and changes can be made within the scope of the invention.

[0120] Industrial Applicability

[0121] The polyurethane foam of the present invention has good drying properties after washing, and can be used for articles to be washed, such as bedding such as mattresses and pillows, furniture such as seat cushions, and clothing such as bra pads for underwear.

Claims

1. An article, wherein The article comprises polyurethane foam, The polyurethane foam is obtained from a polyurethane foam composition containing a polyol component, a polyisocyanate and a foaming agent. The polyisocyanate is only diphenylmethane diisocyanate, The polyurethane foam has a biomass content of 24% or more as measured according to ASTM D6866-20, The polyurethane foam has a surface layer, The article is any one of bedding, furniture or clothing.

2. An article, wherein The article comprises polyurethane foam, The polyurethane foam is obtained from a polyurethane foam composition containing a polyol component, a polyisocyanate and a foaming agent. The polyisocyanate is only diphenylmethane diisocyanate, The polyurethane foam has a biomass content of 50% or more as measured according to ASTM D6866-20, The polyurethane foam has a surface layer, The article is any one of bedding, furniture or clothing.

3. The article according to claim 1 or 2, wherein The polyurethane foam contains one or more of plant-derived polyols, polyether polyols, polyester polyols, and polyether ester polyols.

4. The article according to claim 1 or 2, wherein: The polyol component contains a reaction product of castor oil and sebacic acid.

5. The article according to claim 1 or 2, wherein: The article is a breast pad for underwear.

6. The article according to claim 1 or 2, characterized in that The water absorption rate after washing, the water absorption rate after dehydration, and the water absorption rate after drying for 24 hours of the polyurethane foam were measured using the following methods: In the case where the polyurethane foam is a block foam, the water absorption after washing is less than 200%, the water absorption after dehydration is less than 185%, and the water absorption after drying for 24 hours is less than 3%. In the case where the polyurethane foam is a molded foam product, the water absorption after washing is less than 100%, the water absorption after dehydration is less than 95%, and the water absorption after drying for 24 hours is less than 10%. The method for measuring the water absorption rate after washing is to use a vertical washing machine to sequentially perform a first washing procedure, a second washing procedure, and a third washing procedure on the polyurethane foam sample, measure the weight of the sample at the end of each washing procedure and calculate the water absorption rate, and set the value of the water absorption rate after the end of the third washing procedure as the water absorption rate after washing. Water absorption after washing (%) = (weight of sample after each washing procedure - weight of sample before washing) / (weight of sample before washing) × 100, The method for measuring the water absorption rate after dehydration is as follows: after the third washing program is completed, the first dehydration program and the second dehydration program are performed in sequence, at the end of each dehydration program, the weight of the sample is measured and the water absorption rate is calculated, and the water absorption rate after the second dehydration program is set as the water absorption rate after dehydration. Water absorption rate after dehydration (%) = (weight of sample after each dehydration process - weight of sample before washing) / (weight of sample before washing) × 100, The water absorption rate after drying for 24 hours is calculated by placing the sample at room temperature for 24 hours after the second dehydration process, and then calculating the water absorption rate after drying for 24 hours based on the weight of the sample, wherein 20-28°C is referred to as room temperature. Water absorption after drying for 24 hours (%) = (weight of sample after standing for 24 hours - weight of sample before washing) / (weight of sample before washing) × 100, In the first washing program, the washing time is 11 minutes, the rinsing time is 26 minutes, and the dehydration time is 10 minutes. In the second washing program, the rinsing time is 26 minutes and the dehydration time is 10 minutes. In the third washing program, the rinsing time is 26 minutes and the dehydration time is 10 minutes. In the first dehydration program, the dehydration time is 10 minutes. In the second dehydration program, the dehydration time is 10 minutes.

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