Polyol composition for polyurethane foam production, reaction solution set for polyurethane foam production, polyurethane foam, and method for producing polyurethane foam

Abstract

To provide a technique that improves the appearance of polyurethane foam and reduces the thermal conductivity of the polyurethane foam.SOLUTION: A polyol composition for polyurethane foam production comprises polyol, hydrohaloolefin, and alkanol amide.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present disclosure relates to a polyol composition for producing a polyurethane foam, a reaction liquid set for producing a polyurethane foam, a polyurethane foam, and a method for producing a polyurethane foam. [Background technology]

[0002] Patent Document 1 and Patent Document 2 disclose polyol compositions for rigid polyurethane foams. The polyol compositions of Patent Document 1 and Patent Document 2 use 1-chloro-3,3,3-trifluoropropene as a blowing agent. The polyol composition of Patent Document 1 uses ethyl diglycol acetate as a compatibilizer. The polyol composition of Patent Document 2 uses γ-butyrolactone, ε-caprolactone, and methoxypropyl acetate as compatibilizers. It is described that the use of these compatibilizers can suppress the deterioration of the physical properties of polyurethane foams even when 1-chloro-3,3,3-trifluoropropene is used as a blowing agent. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-74886 A [Patent Document 2] JP 2016-74887 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the techniques described in Patent Documents 1 and 2 are insufficient in improving the appearance of the polyurethane foam and reducing the thermal conductivity of the polyurethane foam. The present disclosure has been made in view of the above-mentioned circumstances, and has an object to provide a technique for improving the appearance of a polyurethane foam and reducing the thermal conductivity of the polyurethane foam. The present disclosure can be realized in the following aspects. [Means for solving the problem]

[0005] [1] A polyol composition for producing polyurethane foam, comprising a polyol, a hydrohaloolefin, and an alkanolamide. [2] The alkanolamide is a compound in which an alkanolamine and a carboxylic acid are bonded by an amide bond, The polyol composition for producing polyurethane foam according to [1], wherein the carboxylic acid is a saturated or unsaturated carboxylic acid having 1 to 30 carbon atoms. [3] A reaction liquid set for producing polyurethane foam, comprising the polyol composition for producing polyurethane foam according to [1] or [2] above and an isocyanate component. [4] A polyurethane foam obtained from the reaction solution set for producing a polyurethane foam according to [3]. [5] A method for producing a polyurethane foam, comprising mixing the polyol composition for producing a polyurethane foam according to [1] or [2] with an isocyanate component. Effect of the Invention

[0006] According to the present disclosure, a technique can be provided that can improve the appearance of a polyurethane foam and reduce the thermal conductivity of the polyurethane foam. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] 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.

[0008] 1. Polyol composition for producing polyurethane foam The polyol composition for producing a polyurethane foam (hereinafter, also referred to as a polyol composition) contains a polyol, a blowing agent, and a surfactant. The blowing agent contains a hydrohaloolefin. The surfactant contains an alkanolamide.

[0009] (1) Polyol The polyol is not particularly limited. Various polyols may be used alone or in combination of two or more. The number average molecular weight, the number of functional groups, and the hydroxyl value of the polyol are not particularly limited. As the polyol, a polyol having a number average molecular weight of 350-3000, a number of functional groups of 2-8, and a hydroxyl value (OHV) of 150 mgKOH / g-500 mgKOH / g is preferable.

[0010] Examples of polyols include polyether polyols, polyester polyols, polyether ester polyols, polycarbonate diols, and polyols having a carbon-carbon bond main chain. Among these, polyether polyols are preferably used from the viewpoint of hydrolysis resistance. Examples of polyether polyols include polyoxypropylene-polyoxyethylene polyols, polymer polyols, and polyoxytetramethylene glycol. Examples of the polyester polyol include aliphatic or aromatic polycondensation polyester polyols and polycaprolactone polyols. Examples of polyols having a carbon-carbon bond-based main chain include polyolefin-based polyols such as polybutadiene polyol and isoprene polyol, plant-derived polyols, and acrylic polyols.

[0011] (1.1) Polyether polyols Examples of polyether polyols include polyether polyols obtained by adding one or more of ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, epichlorohydrin, styrene oxide, etc. to one or more of the following initiators (compounds), or polytetramethylene ether glycol. Among the following initiators, from the viewpoint of imparting appropriate hardness to the polyurethane foam and improving the flame resistance, it is preferable to use an alcohol having 4 to 8 functionalities as at least one of the initiators.

[0012] (1.1.1) Initiator (1.1.1.1) Polyhydric alcohols and alkylene oxide adducts of polyhydric alcohols Examples of polyhydric alcohols: [Difunctional alcohol] Ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, trimethylene glycol [Trifunctional alcohol] Glycerin, trimethylolpropane [Tetrafunctional alcohol] Pentaerythritol [Hexafunctional alcohol] Sorbitol [Octanoic alcohol] Sucrose (1.1.1.2) Alkylene oxide adducts of polyhydric phenols Examples of alkylene oxide adducts of polyhydric phenols: alkylene oxide adducts of bisphenol A (1.1.1.3) Polyhydroxy compounds Examples of polyhydroxy compounds are phosphoric acid, benzene phosphoric acid, polyphosphoric acid (e.g. tripolyphosphoric acid and tetrapolyphosphoric acid), etc. (1.1.1.4) Phenol-aniline-formaldehyde ternary condensation products (1.1.1.5) Aniline-formaldehyde condensation products (1.1.1.6) Polyamines Examples of polyamines: ethylenediamine, diethylenetriamine, triethylenetetramine, methylenebisorthochloroaniline, 4,4- and 2,4'-diphenylmethanediamine, 2,4-tolylenediamine, 2,6-tolylenediamine, etc. (1.1.1.7) Alkanolamines Examples of alkanolamines: triethanolamine, diethanolamine, etc.

[0013] (1.1.2) Polymer polyol The polymer polyol is a polyol obtained by graft-polymerizing the above-mentioned polyether polyol with an ethylenically unsaturated compound such as acrylonitrile, styrene, or alkyl methacrylate.

[0014] (1.2) Polyester polyol The polyester polyols are polyester polyols obtained by condensation of one or more compounds having at least two hydroxyl groups with one or more compounds having at least two carboxyl groups, or ring-opening polymers of cyclic esters such as caprolactone and methylvalerolactone.

[0015] (1.2.1) Examples of compounds having at least two hydroxy groups Ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, trimethylene glycol, 1,3- and 1,4-butanediol, tetramethylene glycol, neopentyl glycol, methylpentanediol, butylethylpropanediol, hexamethylene glycol, decamethylene glycol, glycerin, trimethylolpropane, pentaerythritol, sorbitol

[0016] (1.2.2) Examples of compounds having at least two carboxyl groups Malonic acid, maleic acid, succinic acid, adipic acid, tartaric acid, pimelic acid, azelaic acid, sebacic acid, oxalic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, hemellitic acid

[0017] (1.3) Polycarbonate diol Examples of polycarbonate polyols include those obtained by transesterification of a low molecular weight polyol such as butanediol or hexanediol with a low molecular weight carbonate such as propylene carbonate or diethyl carbonate.

[0018] (1.4) Polyolefin polyols Examples of polyolefin polyols include polybutadiene polyols, polyisoprene polyols, hydrogenated polybutadiene polyols, and hydrogenated polyisoprene polyols.

[0019] (1.5) Plant-derived polyols The polyol may include a plant-derived polyol in addition to the above polyol. Examples of the plant-derived polyol include castor oil-based polyol, soybean oil-based polyol, palm oil-based polyol, palm kernel oil-based polyol, coconut oil-based polyol, cashew 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 polyols usually have 2-3 functional hydroxyl groups in one molecule. Examples of castor oil-based polyols include castor oil, a reaction product of castor oil with a polyol, an esterification reaction product of castor oil fatty acid with a polyol, etc. Examples of polyols to be reacted with castor oil or castor oil fatty acid include divalent polyols such as ethylene glycol, diethylene glycol, and propylene glycol, and trivalent or higher polyols such as glycerin, trimethylolpropane, hexanetriol, and sorbitol. The soybean oil-based polyol may be a polyol derived from soybean oil, such as a reaction product of soybean oil and a polyol, or an esterification reaction product of soybean oil fatty acid and a polyol. The polyol to be reacted with soybean oil or soybean oil fatty acid may be the same as that of castor oil. The same applies to palm oil-based polyol, cashew oil-based polyol, and the like. The various polyols exemplified as plant-derived polyols may be used alone or in combination of two or more kinds.

[0020] (2) Foaming agent The blowing agent includes a hydrohaloolefin, preferably includes a hydrohaloolefin and at least one selected from the group consisting of water and alkanes having 4 to 8 carbon atoms, and more preferably includes a hydrohaloolefin and water.

[0021] Examples of the hydrohaloolefin include hydrofluoroolefin (HFO) and hydrochlorofluoroolefin (HCFO). Examples of the hydrofluoroolefin include fluoroalkenes having 3 to 6 carbon atoms. Examples of the hydrochlorofluoroolefin include chlorofluoroalkenes having 3 to 6 carbon atoms. More specific examples include trifluoropropene, tetrafluoropropenes such as HFO-1234, pentafluoropropenes such as HFO-1225, chlorotrifluoropropenes such as HFO-1233, chlorodifluoropropenes such as HCFO-1242zf, and chlorotetrafluoropropenes such as HCFO-1224yd. More specifically, examples of such fluoropropene include 1,3,3,3-tetrafluoropropene (HFO-1234ze), 1,1,3,3-tetrafluoropropene, 1,2,3,3,3-pentafluoropropene (HFO-1225ye), 1,1,1-trifluoropropene, 1,1,1,3,3-pentafluoropropene (HFO-1225zc), 1,1,1,3,3,3-hexafluorobut-2-ene, 1,1,2,3,3-pentafluoropropene (HFO-1225yc), 1,1,1,2,3-pentafluoropropene (HFO-1225yez), 1-chloro-3,3,3-trifluoropropene (HFO-1233zd), and 1,1,1,4,4,4-hexafluorobut-2-ene. Of these, HFO-1233zd is preferred. These hydrohaloolefins may be used alone or in combination of two or more kinds.

[0022] The content of the hydrohaloolefin is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and even more preferably 20 parts by mass or more, relative to 100 parts by mass of the polyol, from the viewpoint of reducing the thermal conductivity. On the other hand, the content of the hydrohaloolefin is preferably 60 parts by mass or less, more preferably 50 parts by mass or less, and even more preferably 45 parts by mass or less, from the viewpoint of cost and suppressing deactivation of the catalyst. From these viewpoints, the content of the hydrohaloolefin is preferably 5 parts by mass or more and 60 parts by mass or less, more preferably 10 parts by mass or more and 50 parts by mass or less, and even more preferably 20 parts by mass or more and 45 parts by mass or less, relative to 100 parts by mass of the polyol.

[0023] The content of water is not particularly limited. From the viewpoint of low density, the content of water is preferably more than 0 parts by mass relative to 100 parts by mass of polyol, more preferably 0.5 parts by mass or more, and even more preferably 1.0 parts by mass or more. On the other hand, from the viewpoint of reducing thermal conductivity, the content of water is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, and even more preferably 5 parts by mass or less. From these viewpoints, the content of water is more than 0 parts by mass relative to 100 parts by mass of polyol, preferably 20 parts by mass or less, more preferably 0.5 parts by mass or more and 10 parts by mass or less, and even more preferably 1.0 parts by mass or more and 5 parts by mass or less.

[0024] Examples of alkanes having 4 to 8 carbon atoms include cyclic alkanes such as cyclopentane and cyclohexane, and chain alkanes such as n-pentane and isopentane. Of these, cyclopentane is preferred. These alkanes having 4 to 8 carbon atoms may be used alone or in combination of two or more.

[0025] (3) Surfactants The surfactant includes an alkanolamide. It is presumed that the use of an alkanolamide as a surfactant can improve the compatibility between the hydrohaloolefin and the polyol, and can improve the storage stability of the polyol composition. In addition, when an alkanolamide is used as a compound for improving the compatibility between the hydrohaloolefin and the polyol, the thermal conductivity of the polyurethane foam can be suitably reduced. Furthermore, when the hydrohaloolefin is blended, the mixability between the polyol composition and the isocyanate component is deteriorated, and as a result, there is a concern that voids will be generated on the surface of the polyurethane foam, resulting in a poor appearance. On the other hand, when an alkanolamide is used, the appearance of the polyurethane foam can be improved even when the hydrohaloolefin is blended.

[0026] Examples of alkanolamides include compounds in which an alkanolamine and a carboxylic acid are bonded by an amide bond. The carboxylic acid is preferably a saturated or unsaturated carboxylic acid having 1 to 30 carbon atoms. The number of carbon atoms of the carboxylic acid is more preferably 6 to 25, and even more preferably 10 to 20. The carboxylic acid may be a fatty acid. For example, the carboxylic acid may be one or more selected from the group consisting of oleic acid (18:1), lauric acid (12:0), myristic acid (14:0), pentadecylic acid (15:0), palmitic acid (16:0), palmitoleic acid (16:1), margaric acid (17:0), stearic acid (18:0), vaccenic acid (18:1), linoleic acid (18:2), linolenic acid (18:3), and eleostearic acid (18:3). The numbers in parentheses after the above chemical names indicate the number of carbon atoms of the carboxylic acid and the number of double bonds, respectively. For example, the alkanolamine may be one or more selected from the group consisting of diethanolamine, isopropanolamine, monoethanolamine, and 2-aminoethyl-ethanolamine.

[0027] The amount of surfactant in the polyol composition is not particularly limited. From the viewpoint of reducing the thermal conductivity of polyurethane foam, the amount of surfactant is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, and even more preferably 1 part by mass or more, relative to 100 parts by mass of polyol. On the other hand, from the viewpoint of maintaining various physical properties of polyurethane foam and from the viewpoint of production cost, it is preferably 18 parts by mass or less, more preferably 12 parts by mass or less, and even more preferably 6 parts by mass or less. From these viewpoints, the amount of surfactant is preferably 0.1 parts by mass or more and 18 parts by mass or less, more preferably 0.5 parts by mass or more and 12 parts by mass or less, and even more preferably 1 part by mass or more and 6 parts by mass or less.

[0028] (4) Catalyst (optional component) The polyol composition may contain a catalyst. Any conventionally known catalyst may be used without any particular limitation. Various catalysts may be used alone or in combination of two or more kinds. As the catalyst, an amine catalyst can be used. Specific examples of the amine catalyst are shown below. Monoamines such as N,N-dimethylcyclohexylamine, N,N-dicyclohexylmethylamine, triethylamine, and N,N-dimethylbenzylamine; cyclic monoamines such as pyridine, N-methylmorpholine, and N-ethylmorpholine; diamines such as N,N,N',N'-tetramethylethylenediamine, N,N,N',N'-tetramethyl-1,3-propanediamine, N,N,N',N'-tetramethyl-1,3-butanediamine, N,N,N',N'-tetramethylhexanediamine, methylene-bis(dimethylcyclohexylamine), and N,N,N',N'-tetraethylethylenediamine; triamines such as N,N,N',N',N"-pentamethyldiethylenetriamine, N,N,N',N',N"-pentamethyldipropylenetriamine, and 2,4,6-tris(dimethylaminomethyl)-phenol; ether diamines such as 2-(N,N-dimethylaminoethyl) ether, 2-(N,N-dimethylamino)ethyl-3-(N,N-dimethylamino)propyl ether, and 4,4'-oxydimethylene dimorpholine; cyclic polyamines such as triethylenediamine, N,N'-dimethylpiperazine, N,N'-diethylpiperazine, N,N-dimethylaminoethylmorpholine, 1-methylimidazole, 1-isobutyl-2-methylimidazole, and 1-butoxy-2-methylimidazole; and alkanolamines such as N,N,N'-trimethylaminoethylethanolamine, N,N,N'-trimethylaminopropylethanolamine, 2-(2-dimethylamino-ethoxy)ethanol, N,N-dimethylaminoethanol, N,N-trimethyl-1,3-diamino-2-propanol, and N-methyl-N'-(2-hydroxyethyl)-piperazine. The total amount of the amine catalyst in the polyol composition is not particularly limited. The total amount of the amine catalyst is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more, and even more preferably 0.5 parts by mass or more, per 100 parts by mass of polyol, from the viewpoint of sufficiently promoting the polyurethane production reaction. On the other hand, from the viewpoint of maintaining various physical properties of polyurethane foam and from the viewpoint of production cost, it is preferably 8 parts by mass or less, more preferably 5 parts by mass or less, and even more preferably 3 parts by mass or less. From these viewpoints, the total amount of the amine catalyst is preferably 0.05 parts by mass or more and 8 parts by mass or less, more preferably 0.1 parts by mass or more and 5 parts by mass or less, and even more preferably 0.5 parts by mass or more and 3 parts by mass or less, per 100 parts by mass of polyol.

[0029] As the catalyst, a metal catalyst (organometallic catalyst) can be used. Specific examples of the metal catalyst are shown below. Examples of the organic metal compounds include dibutyltin oxide, dibutyltin diacetate, dibutyltin dioctate, dibutyltin dilaurate, dibutyltin oleyl maleate, dibutyltin dibutyl maleate, dibutyltin acetyl acetate, 1,1,3,3-tetrabutyl-1,3-dilauryloxycarbonyl-distannoxane, tin octylate, tin stearate, bismuth octylate, and bismuth versatate. The total amount of the metal catalyst in the polyol composition is not particularly limited, and may be, for example, 0.01 parts by mass or more and 0.50 parts by mass or less per 100 parts by mass of the polyol.

[0030] As the catalyst, an isocyanate trimerization catalyst may be appropriately used. When using an isocyanate trimerization catalyst, the total amount of the isocyanate trimerization catalyst in the polyol composition is not particularly limited. The total amount of the isocyanate trimerization catalyst can be, for example, 0.01 parts by mass or more and 0.50 parts by mass or less with respect to 100 parts by mass of polyol.

[0031] (5) Other ingredients (optional ingredients) The polyol composition may contain, as other components, additives such as a flame retardant, a foam stabilizer, a colorant, and an antioxidant. The flame retardant may be any known flame retardant used in the production of polyurethane foam, such as tris(2,3-dichloropropyl)phosphonate, aluminum hydroxide, metal / amine complex, ammonium polyphosphate, phosphine, neopentyl brominated polyether, dibromopropanol, and dibromoneopentyl glycol. The foam stabilizer may be any foam stabilizer known in the art for producing polyurethane foam, including, for example, silicone-based foam stabilizers such as siloxane-polyalkylene oxide copolymers. The colorant and antioxidant are not particularly limited and may be any of those known in the production of polyurethane foam. The content of these additives can be appropriately adjusted according to the desired physical properties of the resulting polyurethane foam, within a range that does not affect the foaming reaction and resinification reaction of the polyurethane resin. The total amount of the additives can be, for example, 1 part by mass or more and 30 parts by mass or less per 100 parts by mass of the polyol.

[0032] 2. Reaction solution set for polyurethane foam manufacturing The polyol composition may be used to configure a two-component reaction liquid set for producing a polyurethane foam. The reaction liquid set for producing a polyurethane foam includes, for example, the polyol composition as a liquid A and an isocyanate component as a liquid B.

[0033] (2.1) Isocyanate component The isocyanate component is not particularly limited. At least one selected from the group consisting of aromatic isocyanates, alicyclic isocyanates, and aliphatic isocyanates is preferably used as the isocyanate component. At least one aliphatic isocyanate and at least one aromatic isocyanate may be used in combination. The isocyanate component may be either 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, and may be used alone or in combination. For example, bifunctional isocyanates include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 2,2'-diphenylmethane diisocyanate, xylylene diisocyanate, 3,3'-dimethyl-4,4'-biphenylene diisocyanate, and 3,3'-dimethoxy-4,4'-biphenylene diisocyanate. Examples of the isocyanate include aromatic isocyanates such as phenylene diisocyanate, alicyclic isocyanates such as cyclohexane-1,4-diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, and methylcyclohexane diisocyanate, and aliphatic isocyanates such as butane-1,4-diisocyanate, hexamethylene diisocyanate, isopropylene diisocyanate, methylene diisocyanate, and lysine isocyanate. Examples of tri- or higher functional isocyanates include 1-methylbenzene-2,4,6-triisocyanate, 1,3,5-trimethylbenzene-2,4,6-triisocyanate, biphenyl-2,4,4'-triisocyanate, diphenylmethane-2,4,4'-triisocyanate, methyldiphenylmethane-4,6,4'-triisocyanate, 4,4'-dimethyldiphenylmethane-2,2',5,5'tetraisocyanate, triphenylmethane-4,4',4"-triisocyanate, and polymeric MDI. In addition, urethane prepolymers, carbodiimide-modified isocyanates, isocyanurate-modified isocyanates, and biuret-modified isocyanates can also be used.

[0034] The reaction liquid set for producing a polyurethane foam can be used by mixing a polyol composition (Liquid A) and an isocyanate component (Liquid B) in a predetermined mixing ratio. The mixing ratio of the polyol composition and the isocyanate component is not particularly limited. The mixing ratio of the polyol composition and the isocyanate component can be determined according to the isocyanate index. The isocyanate index is preferably 80 to 300, more preferably 105 to 115. The isocyanate index (INDEX) is a value obtained by multiplying the number of moles of the isocyanate component per mole of active hydrogen group contained in the polyol composition by 100, and is calculated by [(isocyanate equivalent of the isocyanate component / equivalent of active hydrogen in the polyol composition)×100].

[0035] 3. Polyurethane foam manufacturing method The method for producing the polyurethane foam is not particularly limited. For example, the method for producing the polyurethane foam includes mixing the polyol composition (liquid A) and the isocyanate component (liquid B). In producing polyurethane foam, the method of mixing liquid A and liquid B is not particularly limited. For example, liquid A and liquid B can be mixed using a small mixer, or a low-pressure or high-pressure foaming machine for injection foaming, a low-pressure or high-pressure foaming machine for slab foaming, a low-pressure or high-pressure foaming machine for continuous lines, a spray foaming machine for spraying work, or the like, which are used in producing general polyurethane foam. In foam molding of polyurethane foam, a predetermined amount of the mixture of liquid A and liquid B may be injected into a mold at a predetermined liquid temperature.

[0036] 4. Polyurethane foam The polyurethane foam is obtained from the reaction liquid set for producing polyurethane foam. The reaction liquid set for producing polyurethane foam may be used for on-site foaming or may be used for producing polyurethane foam by mixing liquid A and liquid B in a production plant.

[0037] The polyurethane foam may be any of flexible polyurethane foam, semi-rigid polyurethane foam, and rigid polyurethane foam. From the viewpoint of heat insulation, the polyurethane foam is preferably rigid polyurethane foam. In the present disclosure, the polyurethane foam includes polyisocyanurate foam.

[0038] The physical properties of the resulting polyurethane foam can be appropriately set depending on the application, etc. The polyurethane foam preferably has the following physical properties. (4.1) Apparent total density The apparent overall density (JIS K7222:2005 compliant) is 20 kg / m 3 -120kg / m 3 is preferred, and 25 kg / m 3 -80kg / m 3 More preferably, 30 kg / m 3 -60kg / m 3 is more preferred. (4.2) Thermal conductivity The thermal conductivity (based on JIS A 1412-2:1999) is preferably 0.0290 W / mK or less, more preferably 0.0250 W / mK or less, even more preferably 0.0230 W / mK or less, and particularly preferably 0.0201 W / mK or less. The lower limit of the thermal conductivity is not particularly limited. The thermal conductivity is usually 0.018 W / mK or more.

[0039] The uses of polyurethane foam are not particularly limited. Since polyurethane foam has the above-mentioned physical properties, it is effective as a heat insulating material. In addition, polyurethane foam is suitable as a packaging material, a filler, and a cushioning material. EXAMPLES

[0040] 1. Preparation of polyol composition (liquid A) Polyol compositions were prepared by mixing the components in the ratios shown in Table 1. Example 1 is an example of a polyol composition containing an alkanolamide as a surfactant. Comparative Examples 1 and 2 are examples of polyol compositions containing 2-(2-ethoxyethoxy)ethyl acetate or 6-hexanolactone as a compatibilizer. Comparative Example 3 is an example of a polyol composition that does not contain a surfactant or a compatibilizer (blank).

[0041] The details of each raw material are as follows: Polyether polyol 1: Polyether polyol using sucrose as an initiator, molecular weight 650, hydroxyl value 450mgKOH / g Polyether polyol 2: Polyether polyol using toluene diamine as an initiator, molecular weight 561, hydroxyl value 400 mg KOH / g Flame retardant: Tris(2,3-dichloropropyl)phosphonate (TCPP) Foam stabilizer: Silicone surfactant, SZ1677, manufactured by Dow Corning Toray Amine catalyst: N,N-dimethylcyclohexylamine Alkanolamide: N,N-diethanol oleic acid amide, carboxylic acid with 18 carbon atoms 2-(2-ethoxyethoxy)ethyl acetate 6-Hexanolactone ·water Hydrohaloolefins: Hydrofluoroolefins HFO-1233zd, Solstice LBA, Honeywell

[0042] [Table 1]

[0043] The following raw materials were used as the isocyanate component (liquid B). Isocyanate component: Polymeric MDI, Formlite 200B, BASF INOAC Polyurethanes

[0044] The polyol composition (liquid A) and the isocyanate component (liquid B) were mixed and molded to obtain a polyurethane foam. Liquid A and liquid B were mixed in the ratio (liquid A / liquid B, mass ratio) shown in Table 2. A formwork measuring 300 mm×300 mm×50 mm was used as a mold for molded foaming.

[0045] 2. Evaluation Methodology (1) Thermal conductivity According to JIS A1412-2:1999, the polyurethane foam obtained by mold foaming, measuring 300mm x 300mm x 50mm, was cut into pieces measuring 200mm x 200mm x 25mm. The thermal conductivity was then measured using a thermal conductivity measuring instrument "AUTO-Λ HC-074" manufactured by Eiko Seiki Co., Ltd. The thermal conductivity measurement was carried out one week after the polyurethane foam was obtained by mold foaming.

[0046] (2) Appearance The apparent overall density of the polyurethane foam was measured in accordance with JIS K7222:2005.

[0047] The appearance of the polyurethane foam was visually evaluated according to the following criteria. "Good": There are few voids on the surface, and the surface properties are good. "Fair": Voids etc. are observed on the surface, but it is usable. "Poor": A large number of voids or the like are observed on the surface, and the surface properties are poor.

[0048] 3. Results The results are shown in Table 1. The thermal conductivity of Example 1 was lower than that of Comparative Example 3 (blank). In contrast, the thermal conductivity of Comparative Examples 1 and 2 was higher than that of Comparative Example 3 (blank). It was suggested that the thermal conductivity can be reduced when alkanolamide is used.

[0049] The appearance of Example 1 was evaluated as "good". In contrast, the appearance of Comparative Example 3 was evaluated as "poor". This is considered to be due to the fact that the polyol composition of Comparative Example 3 does not contain an alkanolamide or a compatibilizer, and therefore the miscibility between the polyol composition containing HFO-1233zd and the isocyanate component is poor. This example suggests that when an alkanolamide is used, the miscibility between the polyol composition and the isocyanate component can be improved, thereby improving the appearance of the polyurethane foam.

[0050] According to the above-mentioned embodiments, a technique can be provided that can improve the appearance of the polyurethane foam and reduce the thermal conductivity of the polyurethane foam.

[0051] The present disclosure is not limited to the embodiments described above in detail, and various modifications and variations are possible within the scope of the present disclosure.

Claims

1. A polyol composition for producing polyurethane foam, comprising a polyol, a hydrohaloolefin, and an alkanolamide.

2. The alkanolamide is a compound in which an alkanolamine and a carboxylic acid are bonded by an amide bond, 2. The polyol composition for producing polyurethane foam according to claim 1, wherein the carboxylic acid is a saturated or unsaturated carboxylic acid having 1 to 30 carbon atoms.

3. A reaction liquid set for producing polyurethane foam, comprising: the polyol composition for producing polyurethane foam according to claim 1 or 2; and an isocyanate component.

4. A polyurethane foam obtained from the reaction solution set for producing a polyurethane foam according to claim 3.

5. A method for producing a polyurethane foam, comprising mixing the polyol composition for producing a polyurethane foam according to claim 1 or 2 with an isocyanate component.

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