Urethane foam-forming composition and urethane foam

Abstract

To provide a urethane foam forming composition that contributes to forming a urethane foam with an extremely small amount of aldehyde volatilization, and a urethane foam with an extremely small amount of aldehyde volatilization.SOLUTION: A urethane foam forming composition comprises a first liquid comprising a polyol component (A), a second liquid comprising a polyisocyanate component (B), and an aldehyde scavenger (F), the aldehyde scavenger (F) being an amino oxy alkyl group-supporting carrier in which a compound having a specific structure represented by the formula (1) is chemically bonded to a carrier, where R is a C1-4 alkyl group, two Rs may be the same or different if m is 2, X is a C1-4 alkoxy group, plural Xs may be the same or different if m is 0 or 1; m is an integer of 0-2; and n is an integer of 1-12.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a urethane foam-forming composition and a urethane foam. [Background technology]

[0002] Urethane foam is used in a wide range of applications, including household goods, automotive materials, clothing, sports and leisure goods, apparel materials, and civil engineering and construction materials. Among these applications, reducing VOCs (volatile organic compounds) and odors from materials is required to improve indoor environments, particularly in seat cushions and backing materials, sound-absorbing and vibration-damping materials for floors and ceilings, automotive materials such as steering wheels, household items such as bedding and sofas, and civil engineering and construction materials such as insulation. Among VOCs, aldehydes in particular are a cause of chemical sensitivity and are also a factor in odors, so reducing aldehydes is essential.

[0003] Aldehyde scavengers have been attracting increasing attention as a measure to reduce aldehydes generated from urethane foams. Patent Document 1 discloses a polyol composition for producing flexible polyurethane foams, which contains an aldehyde scavenger such as a urea compound, an amino acid, or a polyhydric phenol. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-110753 Summary of the Invention [Problem to be solved by the invention]

[0005] However, when a urethane foam is formed using the polyol composition disclosed in Patent Document 1, the isocyanate, which is one of the main components, reacts with the aldehyde scavenger during the urethane foam molding process, resulting in a decrease in the ability of the aldehyde scavenger and the inability to sufficiently reduce aldehydes. Therefore, one aspect of the present invention is directed to providing a urethane foam-forming composition that contributes to the formation of urethane foam with extremely low aldehyde volatilization, and another aspect of the present invention is directed to providing a urethane foam with extremely low aldehyde volatilization. [Means for solving the problem]

[0006] According to one aspect of the present invention, a first liquid containing a polyol component (A); a second liquid containing a polyisocyanate component (B); an aldehyde scavenger (F), the aldehyde scavenger (F) is an aminooxyalkyl group-carrying carrier in which the compound represented by formula (1) and the carrier are chemically bonded, The urethane foam-forming composition is provided, wherein the aminooxyalkyl group-supporting carrier has one or more structures represented by formula (2):

[0007] [ka]

[0008] [ka]

[0009] During the ceremony, R represents an alkyl group having 1 to 4 carbon atoms; When m is 2, two R's may be the same or different; X represents an alkoxy group having 1 to 4 carbon atoms; When m is 0 or 1, multiple Xs may be the same or different; m represents an integer of 0 to 2; m' represents an integer of 0 to 1; n represents an integer of 1 to 12.

[0010] According to another aspect of the present invention, there is provided a urethane foam which is a foamed and cured product of the above urethane foam-forming composition. [Effects of the Invention]

[0011] According to one aspect of the present invention, there is provided a urethane foam-forming composition that contributes to the formation of urethane foam with extremely low aldehyde volatilization. According to another aspect of the present invention, there is provided a urethane foam with extremely low aldehyde volatilization. DETAILED DESCRIPTION OF THE INVENTION

[0012] Exemplary embodiments for carrying out each aspect of the present invention will be described in further detail below, although the present invention is not limited to the following embodiments.

[0013] The urethane foam-forming composition according to one aspect of the present invention comprises: a first liquid containing a polyol component (A); a second liquid containing a polyisocyanate component (B); an aldehyde scavenger (F), the aldehyde scavenger (F) is an aminooxyalkyl group-carrying carrier in which the compound represented by formula (1) and the carrier are chemically bonded, The aminooxyalkyl group-supported carrier has one or more structures represented by formula (2):

[0014] [ka]

[0015] [ka]

[0016] During the ceremony, R represents an alkyl group having 1 to 4 carbon atoms; When m is 2, two R's may be the same or different; X represents an alkoxy group having 1 to 4 carbon atoms; When m is 0 or 1, multiple Xs may be the same or different; m represents an integer of 0 to 2; m' represents an integer of 0 to 1; n represents an integer of 1 to 12.

[0017] The urethane foam-forming composition preferably further contains a catalyst (C), a foam stabilizer (D), and a blowing agent (E).

[0018] <First liquid> Polyol component (A) The polyol component (A) undergoes polyaddition with the polyisocyanate component (B) to form a urethane. Examples of the polyol component (A) include polyether polyols, polyester polyols, polycarbonate polyols, polyolefin polyols, animal and plant polyols, polymer polyols, short molecular weight polyols that function as chain extenders, halogen-containing polyols, phosphorus-containing polyols, and phenol-based polyols. One type of polyol component may be used alone, or multiple types may be used in combination.

[0019] Examples of polyether polyols include polypropylene ether polyol, polyethylene polypropylene ether polyol (polyoxyethylene polyoxypropylene polyol), polytetramethylene ether glycol (PTG), and the like.

[0020] Examples of polyester polyols include polycondensation polyester polyols and lactone polyester polyols. Examples of polycondensation polyester polyols include polyester polyols that are copolymers of adipic acid and diols. Examples of lactone polyester polyols include polycaprolactone polyols.

[0021] Examples of polycarbonate polyols include those obtained by a dealcoholization reaction or a dephenolization reaction between a short-chain diol, a short-chain triol, or the like and a low-molecular-weight carbonate such as ethylene carbonate, diethyl carbonate, or diphenyl carbonate.

[0022] The polyolefin polyol is a polyolefin having two hydroxyl groups, such as polybutadiene, hydrogenated polybutadiene, polyisoprene, and hydrogenated polyisoprene.

[0023] Examples of animal and vegetable polyols include castor oil polyols and silk fibroin.

[0024] Examples of polymer polyols include polymer polyols obtained by reacting a polyether polyol with an ethylenically unsaturated monomer (such as butadiene, acrylonitrile, or styrene) in the presence of a radical polymerization catalyst.

[0025] Examples of chain extenders include low molecular weight polyhydric alcohols such as ethylene glycol, 1,4-butanediol, glycerin, and trimethylolpropane; low molecular weight amine polyols such as diethanolamine and triethanolamine; and polyamines such as ethylenediamine, xylenediamine, and methylenebisorthochloroaniline.

[0026] Examples of halogen-containing polyols include those obtained by ring-opening polymerization of epichlorohydrin or trichlorobutylene oxide, and brominated polyhydric alcohols to which alkylene oxides are added.

[0027] Examples of phosphorus-containing polyols include those obtained by addition polymerization of alkylene oxide with phosphoric acid, phosphorous acid, organic phosphoric acid, etc., and those obtained by addition polymerization of alkylene oxide with polyhydroxypropylphosphine oxide.

[0028] Examples of phenol-based polyols include polyols obtained by reacting alkylene oxides with novolak resins and resol resins obtained from phenol and formalin, and Mannich-based polyols obtained by reacting alkylene oxides with a product obtained by reacting a phenol with an alkanolamine and formalin.

[0029] <Second liquid> Polyisocyanate component (B) Examples of the polyisocyanate component (B) include 4,4'-diphenylmethane diisocyanate, 2,4-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, polyphenylene polymethylene polyisocyanate, hexamethylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 1,5-naphthalene diisocyanate, 1,3-phenylene diisocyanate, and modified products of these isocyanates (urethane modified products, urea modified products, allophanate modified products, nurate modified products, biuret modified products, etc.). These isocyanate components may be used alone or in combination.

[0030] <Other ingredients> Examples of the catalyst (C) include various known urethane catalysts, such as triethylamine, tripropylamine, tributylamine, N-methylmorpholine, N-ethylmorpholine, dimethylbenzylamine, N,N,N',N'-tetramethylhexamethylenediamine, N,N,N',N',N''-pentamethyldiethylenetriamine, bis-(2-dimethylaminoethyl)ether, triethylenediamine, 1,8-diaza-bicyclo[5.4.0]undecene-7, 1,2-dimethylimidazole, dimethylethanolamine, N,N-dimethyl-N-hexanolamine, and organic acid salts thereof. Other examples include amine catalysts having a hydroxy group, such as N,N-dimethylethanolamine, N,N-diethylethanolamine, 2-hydroxymethyltriethylenediamine, 6-dimethylamino-1-hexanol, and 2-(2-dimethylaminoethoxy)ethanol, and organometallic compounds, such as dibutyltin dilaurate, dibutyltin dioctylate, dibutyltin diacetylate, 2-ethylhexanetin, and zinc naphthenate. These catalyst components may be used alone or in combination.

[0031] Examples of the foam stabilizer (D) include known silicone-based foam stabilizers and fluorine compound-based foam stabilizers, such as SZ-1327, SZ-1325, SZ-1336, and SZ-3601 manufactured by Dow Corning Toray Co., Ltd., Y-10366, L-540, L-3639LF2, L-5309, L-6164, and L-6168 manufactured by Momentive Corporation, B-8123, B-8460, B-8462, B-8487, B-8724LF2, and B-8715LF2 manufactured by Evonik, and F-122 manufactured by Shin-Etsu Chemical Co., Ltd. These foam stabilizer components may be used alone or in combination.

[0032] Examples of the blowing agent (E) include water, inorganic acids such as organic acids, alkali carbonates, cyclic carbonates, dialkyl carbonates, and the like, which generate gas by decomposition through reaction with a urethane raw material or through heat, etc., hydrochlorofluoroolefins, hydrofluoroolefins, hydrofluorocarbons, halogenated hydrocarbons, hydrocarbons, chlorofluorocarbons, perfluorocarbons, low-boiling-point halogens such as methylene chloride, gases such as carbon dioxide, low-temperature liquids, and the like, which generate gas through heat, etc. These blowing agent components may be used alone or in combination.

[0033] <Aldehyde Scavenger (F)> The aldehyde scavenger (F) is an aminooxyalkyl group-supported carrier in which the compound represented by formula (1) and the carrier are chemically bonded, and the aminooxyalkyl group-supported carrier has one or more structures represented by formula (2).

[0034] [ka]

[0035] [ka]

[0036] During the ceremony, R represents an alkyl group having 1 to 4 carbon atoms, and when m is 2, two R may be the same or different; X represents an alkoxy group having 1 to 4 carbon atoms, and when m is 0 or 1, multiple Xs may be the same or different; m represents an integer of 0 to 2; m' represents an integer of 0 to 1; n represents an integer of 1 to 12.

[0037] An example of the aldehyde scavenger (F) is one obtained by chemically modifying a support with a compound represented by formula (1) (hereinafter also referred to as a "silane coupling agent") (hereinafter also referred to as a "silane coupling reaction").

[0038] R represents an alkyl group having 1 to 4 carbon atoms, and X represents an alkoxy group having 1 to 4 carbon atoms. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, a 2-methylpropyl group, a 1-methylpropyl group, and a tert-butyl group. Examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, a 2-methylpropyloxy group, a 1-methylpropyloxy group, and a tert-butoxy group. In terms of efficiency of the silane coupling reaction, R is preferably a methyl group, and X is preferably a methoxy group, an ethoxy group, or an isopropoxy group. m is preferably an integer of 0 to 1, m' is preferably 0, and n is preferably an integer of 3 to 9. Multiple Xs may be the same or different.

[0039] The silane coupling agent represented by formula (1) may be a commercially available product and used, or may be synthesized in accordance with the methods described in Organic Preparations and Procedures International, 1994, Vol. 26, pp. 111-113, JP-A-7-233132, and Tetrahedron Letters, 2005, Vol. 46, pp. 7973-7975.

[0040] In the aminooxyalkyl group-carrying carrier, a part or all of the aminooxyalkyl groups may be in the form of a chemically acceptable salt with an inorganic acid or an organic acid. The type of salt is not particularly limited, but examples thereof include inorganic acid salts such as hydrochloride, hydrobromide, perchlorate, silicate, tetrafluoroborate, hexafluorophosphate, sulfate, nitrate, and phosphate, and organic acid salts such as acetate, citrate, fumarate, maleate, trifluoromethanesulfonate, trifluoroacetate, benzoate, and p-toluenesulfonate. Inorganic acid salts are preferred in terms of low cost, and hydrochloride is more preferred.

[0041] The amount of aminooxyalkyl group supported on the carrier can be adjusted as desired depending on the purpose and is not particularly limited, but it is preferable that the amount of aminooxyalkyl group is in the range of 0.01 mmol / g or more and 10 mmol / g or less relative to the mass of the carrier.

[0042] The carrier is not particularly limited as long as it is insoluble in water. Examples include polymeric carriers such as styrene-based polymers such as polystyrene and cross-linked polystyrene, polyolefins such as polyethylene and polypropylene, poly(halogenated olefins) such as polyvinyl chloride and polytetrafluoroethylene, nitrile-based polymers such as polyacrylonitrile, (meth)acrylic polymers such as polymethyl methacrylate and polyethyl acrylate, and high-molecular-weight polysaccharides such as cellulose, agarose, and dextran; and inorganic carriers such as silica gel, alumina, zeolite, magnesia, titania, zirconia, ceria, diatomaceous earth, activated carbon, cellulose, and hydroxyapatite. As the carrier to be mixed with the silane coupling agent, inorganic carriers are preferred, and silica gel is more preferred, in view of the efficiency of the silane coupling reaction.

[0043] The shape of the carrier is not particularly limited, but examples include shapes commonly used as separation substrates, such as spherical (e.g., spherical particles), granular, fibrous, granular, monolithic column, hollow fiber, and membrane (e.g., flat membrane), among which spherical, membranous, granular, granular, and fibrous shapes are preferred. Spherical, granular, or granular carriers are particularly preferred because the volume used can be freely set when used in a column method or batch method. The particle size of spherical, granular, or granular carriers is usually in the range of 0.1 μm to 10 mm on average, but is preferably 0.1 μm to 100 μm in terms of good dispersibility in liquid.

[0044] The carrier may be porous or non-porous. The average pore size of the porous carrier is usually 0.1 nm to 1 μm, but is preferably in the range of 0.1 nm to 300 nm in terms of the aldehyde capture rate.

[0045] The content of the aminooxyalkyl group-carrying carrier is preferably 0.01% by mass or more and 10% by mass or less, based on the total amount of the urethane foam-forming composition.

[0046] The aldehyde scavenger (F) may be contained in the first liquid, the second liquid, or neither of them but the third liquid, and is preferably contained in the first liquid.

[0047] The content of the aldehyde scavenger (F) is preferably 0.01% by mass or more and 10% by mass or less, based on the total amount of the urethane foam-forming composition.

[0048] If necessary, the urethane foam-forming composition may further contain auxiliary agents such as breathability improvers, fillers, stabilizers, colorants, flame retardants, antioxidants, etc., and these auxiliary agents may be used alone or in combination.

[0049] A urethane foam can be obtained from the urethane foam-forming composition described above. The urethane foam is a foamed and cured product of the urethane foam-forming composition. The urethane foam may be a flexible urethane foam, or may be a rigid or semi-rigid urethane foam. The urethane foam may also be an automotive urethane foam.

[0050] Next, a method for producing urethane foam will be described. A urethane foam according to one embodiment of the present invention can be produced by reactively foaming a mixed liquid of a polyol component (A), a polyisocyanate component (B), a catalyst (C), a foam stabilizer (D), a blowing agent (E), and an aldehyde scavenger (F).

[0051] Examples of methods for producing urethane foam include urethane molded foam (hereinafter referred to as molded foam), in which a foaming concentrate consisting of a mixture of a polyol component (A), a polyisocyanate component (B), a catalyst (C), a foam stabilizer (D), a blowing agent (E), and an aldehyde scavenger (F) is poured into a mold and then foamed and cured, and urethane slab foam (hereinafter referred to as slab foam), in which the mixture is foamed by supplying it to a foaming container or continuously onto a belt conveyor. Furthermore, a spray foaming machine for on-site spraying work may be used, and foaming can also be performed directly at the construction site.

[0052] The first liquid containing the polyol component (A) and the second liquid containing the polyisocyanate component (B) are preferably mixed immediately before foaming. Other components can be premixed with the polyol component (A) or the polyisocyanate component (B) to the extent that they do not affect the storage stability or reactivity over time of the raw materials. The aldehyde scavenger (F) is preferably mixed with the polyol component (A) that has a higher aldehyde content than the polyisocyanate component (B) in order to effectively reduce aldehydes. The mixture can be used immediately after mixing, or stored and then used as needed. In the case of a foaming device capable of simultaneously introducing more than two components into the mixing section, the polyol component (A), polyisocyanate component (B), catalyst (C), foam stabilizer (D), blowing agent (E), aldehyde scavenger (F), auxiliary agent, etc. can also be introduced into the mixing section individually.

[0053] The mixing method may be either dynamic mixing, in which mixing is performed in the machine head mixing chamber of the foaming machine, or static mixing, in which mixing is performed in the liquid delivery pipe, or a combination of both. Mixing of gaseous components such as physical foaming agents with liquid components may be performed by static mixing, and mixing of components that can be stably stored as liquids may be performed by dynamic mixing. The foaming device is preferably a high-pressure foaming device that does not require solvent cleaning of the mixing section.

[0054] The mixture obtained by this mixing is discharged into a metal mold, foamed and cured, and then demolded. To facilitate the demolding, it is also preferable to apply a release agent to the metal mold in advance. Examples of the release agent include those commonly used in the molding and processing fields.

[0055] As a method for producing slab foam, there are two methods: a method in which all components are mixed in a multi-component foaming machine having a known rotor rotation type or high-pressure impingement mixing type mixing head for mixing raw materials, and the mixed liquid is then supplied to a foaming container or continuously onto a belt conveyor for foaming; and a method in which all components are mixed in a batch type mixing tank, and the mixture is then poured into a foaming container for foaming (sometimes called batch block). [Example]

[0056] The present invention will be described in more detail below based on examples and comparative examples, but the present invention is not limited to the following examples. Unless otherwise specified, "parts" and "%" are by mass.

[0057] In the following examples and comparative examples, the following raw materials were used. Polyisocyanate 1: A polyisocyanate mixture containing polyphenylene polymethylene polyisocyanate, with an MDI content of 85% by mass and an isomer content of 38% by mass (manufactured by Tosoh Corporation, product name: CEF-550) Polyisocyanate 2: A polyisocyanate mixture containing 67% by mass of MDI and 37% by mass of isomers, and containing polyphenylenepolymethylene polyisocyanate. Polyol 1: polyethylene polypropylene ether polyol having an average functionality of 3, a hydroxyl value of 24 (mgKOH / g), a primary terminal ratio of 84 mol%, oxyethylene units of 14.6 mass%, and a total unsaturation of 0.03 mFq / g (manufactured by Tosoh Corporation, product name: NEF-693) Polyol 2: Polyoxyethylene polyoxypropion glycol having an average functionality of 3 and a hydroxyl value of 24 (mgKOH / g) (manufactured by AGC, product name: EL-923) Polyol 3: Polyether polyol having an average functionality of 3 and a hydroxyl value of 28 (manufactured by Jurong Ningwu New Material Co., Ltd., product name: NJ-360N) Polyol 4: Polyether polyol having an average functionality of 3 and a hydroxyl value of 240 (manufactured by Kaka Chemical Co., Ltd., product name: G-700) Polyol 5: Polyether polyol having an average functionality of 3 and a hydroxyl value of 480 (manufactured by Kaka Chemical Co., Ltd., product name: G-300) Polyol 6: Polyether polyol having an average functionality of 3, a hydroxyl value of 24 (mgKOH / g), and oxyethylene units of 70% by mass (manufactured by Tosoh Corporation, product name: NEF-729) Polyol 7: 1,4-butanediol (Mitsubishi Chemical Corporation) Catalyst 1: 33% dipropylene glycol solution of triethylenediamine (manufactured by Tosoh Corporation, product name: TEDA-L33) Catalyst 2: 70% dipropylene glycol solution of bis(2-dimethylaminoethyl) ether (manufactured by Tosoh Corporation, trade name: TOYOCAT-ET) Catalyst 3: Reactive catalyst based on 2-hydroxymethyltriethylenediamine (manufactured by Tosoh Corporation, product name: RZETA) Foam stabilizer 1: Silicone foam stabilizer (manufactured by Evonik, product name: B-8715LF2) Foam stabilizer 2: Silicone foam stabilizer (manufactured by Momentive, product name: L-6168) Foam stabilizer 3: Silicone foam stabilizer (manufactured by Evonik, product name: B-8462) Antioxidant 1: Antioxidant (manufactured by BASF, trade name: PUR-68) Foaming agent: City water. Aldehyde scavenger 1: Aminoxy group-bearing carrier Aldehyde scavenger 2: Aldehyde scavenger (manufactured by Toagosei Co., Ltd., product name: Kesmon NS-750) Aldehyde scavenger 3: Aminooxyacetic acid 3% aqueous solution

[0058] (Examples 1 to 4, Comparative Examples 1 to 6) <Synthesis of aldehyde scavenger 1> After mixing 19.94 g of silica gel (NIPGEL BY-400, manufactured by Tosoh Silica) and 173.4 g of toluene, a mixture of 8.08 g of the silane coupling agent represented by chemical formula (1') and 43.35 g of toluene was added dropwise under a nitrogen atmosphere and stirred at 25°C for 120 hours. The resulting reaction solution was filtered, and the residue was dried at 120°C for 4 hours to obtain a support with aminooxyalkyl groups supported by chemical bonding (hereinafter referred to as "aminooxy group-supported support"). Elemental analysis of the resulting aminooxy group-supported support revealed that the aminooxyalkyl group content was 1.4 mmol / g relative to the support mass.

[0059] [ka]

[0060] <Preparation of Polyol Composition (First Liquid)> After replacing the atmosphere in a reactor equipped with a stirrer, a cooling tube, a nitrogen inlet tube, and a thermometer with nitrogen, 70 g of polyol 1, 30 g of polyol 2, 0.4 g of polyol 6, 0.53 g of catalyst 1, 0.2 g of catalyst 2, 1.0 g of foam stabilizer 1, 3.3 g of water, and 0.22 g of aldehyde scavenger 1 were charged and stirred for 0.5 hours to obtain polyol composition P-1. The other polyol compositions (P-2 to P-10) were also prepared in the same manner as polyol composition (P-1) by charging each raw material according to the parts listed in Table 1.

[0061] <Preparation of Polyisocyanate Composition (Second Liquid)> Polyisocyanate 1 was used as polyisocyanate composition I-1, and polyisocyanate 2 was used as polyisocyanate composition I-2.

[0062] <Molding of Flexible Urethane Foam (Examples 1 to 3, Comparative Examples 1 and 3 to 6)> Flexible urethane foams were molded using the polyol composition and polyisocyanate composition in the combination shown in Table 1. Specifically, the liquid temperatures of the polyol composition and polyisocyanate composition prepared above were each adjusted to 24°C to 26°C. Next, a predetermined amount of polyisocyanate composition was added to the polyol composition so as to achieve the blending ratio (mass of polyisocyanate composition per 100g of polyol composition) shown in Table 1, and after mixing for 7 seconds with a mixer (7000 rpm), the mixture was poured into a mold and reactively foamed. The reactive foaming conditions were as follows:

[0063] [Foaming conditions] Mold temperature: 60~65℃ Mold shape: 300mm x 300mm x 100mm Mold material: Aluminum Cure time: 5 minutes

[0064] After molding the flexible urethane foam by the above method, the resulting molded flexible urethane foam was removed from the mold.

[0065] <Molding of Semi-Rigid Urethane Foam (Example 4 and Comparative Example 2)> A foaming mixture was prepared in the same manner as in the molding of the flexible urethane foam, and then poured into an open upper mold container (250 x 250 x 250 mm), and the mixture was reactively foamed. After the semi-rigid urethane foam was molded by the above method, the resulting semi-rigid urethane foam molded body (slab foam) was removed from the upper open container.

[0066] [Table 1]

[0067] <Regarding the measurement of aldehydes> The volatilization amounts of formaldehyde, acetaldehyde, and propionaldehyde were measured for each of the resulting urethane foam molded articles. Rectangular specimens measuring 100 mm long x 70 mm wide and 80 mm thick (including the skin surface) were cut from the flexible and semi-rigid urethane foam samples. These specimens were placed in a 10-L sampling bag with 4 L of nitrogen. The sampling bag was heated to 65 °C for 2 hours, and 3 L of nitrogen gas containing the volatile components in the bag was collected in a dedicated collection tube (DNPH cartridge). To calculate the aldehyde gas content in the nitrogen gas, 4 L of nitrogen gas was added to a sampling bag without sample and collected in the collection tube in the same manner as above. After collecting the nitrogen gas containing the sample and the nitrogen gas without sample, the aldehyde gas volatilization amount was measured by high-performance liquid chromatography. The aldehyde volatilization amount from the sample specimen was calculated using the following formula:

[0068] (Amount of aldehyde volatilized from test piece) = (Amount of aldehyde volatilized from nitrogen gas containing sample - Amount of aldehyde volatilized from nitrogen gas not containing sample) x 4 / 3

[0069] The measurement conditions for high performance liquid chromatography are as follows. The Shimadzu LC-20A series instrument and Tosoh TSKgel ODS-80TsQA column were used, with acetonitrile / water as the mobile phase and a mobile phase flow rate of 1.0 mL / min. The column temperature was 40°C, and the detector was UV (λ = 360 nm). A calibration curve was created using an acetonitrile solution of aldehyde-DNPH as the standard sample solution. The results are shown in Table 1.

[0070] As shown in Table 1, it was found that the urethane foam molded articles of Examples 1 to 4 had a smaller amount of aldehyde volatilization than the urethane foam molded articles of Comparative Examples 1 to 6.

Claims

1. a first liquid containing a polyol component (A); a second liquid containing a polyisocyanate component (B); an aldehyde scavenger (F); the aldehyde scavenger (F) is an aminooxyalkyl group-carrying carrier in which the compound represented by formula (1) and the carrier are chemically bonded, A urethane foam-forming composition, wherein the aminooxyalkyl group-supported carrier has one or more structures represented by formula (2): 【Chemical 1】 【Chemistry 2】 During the ceremony, R represents an alkyl group having 1 to 4 carbon atoms; When m is 2, two R's may be the same or different; X represents an alkoxy group having 1 to 4 carbon atoms; When m is 0 or 1, multiple Xs may be the same or different; m represents an integer of 0 to 2; m' represents an integer of 0 to 1, and in the structure represented by formula (2), m' is 1 in the second structure from the left; n represents an integer of 1 to 12.

2. During the ceremony, R is a methyl group; 2. The urethane foam-forming composition of claim 1, wherein each X is independently a methoxy group, an ethoxy group, or an isopropoxy group.

3. 3. The urethane foam-forming composition according to claim 1, wherein the carrier is silica gel, alumina, zeolite, magnesia, titania, zirconia, ceria, diatomaceous earth, activated carbon, cellulose, or hydroxyapatite.

4. 3. The urethane foam-forming composition according to claim 1, wherein the carrier is silica gel.

5. A urethane foam-forming composition according to any one of claims 1 to 4, wherein the content of the aldehyde scavenger (F) is 0.01 mass% or more and 10 mass% or less, relative to the total amount of the urethane foam-forming composition.

6. The urethane foam-forming composition according to claim 1 , wherein the first liquid comprises the aldehyde scavenger (F).

7. 7. The urethane foam-forming composition according to claim 1, further comprising a catalyst (C), a foam stabilizer (D), and a blowing agent (E).

8. A urethane foam which is a foamed and cured product of the urethane foam-forming composition according to any one of claims 1 to 7.

9. The urethane foam according to claim 8, which is a flexible urethane foam.

10. 9. The urethane foam according to claim 8, which is a rigid or semi-rigid urethane foam.

11. The urethane foam according to any one of claims 8 to 10, which is an automotive urethane foam.

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