Polyurethane foam

Abstract

To provide a polyurethane foam that prevents the occurrence of static electricity without using an antistatic agent.SOLUTION: A polyurethane foam comprises a composition that is a mixture of at least a polyol, a foam stabilizer, a foamer, and an isocyanate. The polyurethane foam has an apparent density of 50 kg / m3 or less. The polyurethane resin composition comprises at least one compound selected from the group consisting of an alkali metal salt and an alkaline-earth metal salt.SELECTED DRAWING: None

Description

[Technical field]

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

[0002] General soft urethane foam has high electrical resistance (volume resistivity) and is prone to static electricity. Therefore, antistatic foams have been proposed that have lowered volume resistivity by adding antistatic agents (see, for example, Patent Documents 1-3). Examples of antistatic agents that have been used include quaternary ammonium salts, cationic / nonionic surfactants, alkylamines, and conductive carbon. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-173939 [Patent Document 2] JP 2005-114043 A [Patent Document 3] JP 2006-154537 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, most antistatic agents are expensive. The present disclosure has been made in view of the above-mentioned circumstances, and has an object to suppress the generation of static electricity without using an antistatic agent. The present disclosure can be realized in the following aspects. [Means for solving the problem]

[0005] at least A polyol, A foam stabilizer, A foaming agent; A static suppression polyurethane foam obtained from a composition comprising a mixture of an isocyanate and Apparent density is 50kg / m 3 is as follows: The polyurethane foam composition includes one or more compounds selected from the group consisting of alkali metal salts and alkaline earth metal salts. Effect of the Invention

[0006] According to the present disclosure, the generation of static electricity can be suppressed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Here, a preferred example of the present disclosure is given. [2] A polyurethane foam, wherein the compound has a solubility of 80 or more in 100 g of water at 20°C.

[0008] [3] One or more metals selected from the group consisting of alkali metals and alkaline earth metals are detected in a qualitative analysis; Apparent density is 50kg / m 3 Below is a polyurethane foam.

[0009] [4] The volume resistivity measured according to JIS K6911 is 1×10 14 Polyurethane foam with a resistance of less than Ωcm.

[0010] The present disclosure will be described in detail below. In this specification, a description using "~" for a numerical range includes the lower limit and the upper limit unless otherwise specified. For example, the description "10 to 20" includes both the lower limit "10" and the upper limit "20". In other words, "10 to 20" has the same meaning as "10 or more and 20 or less".

[0011] 1. Polyurethane foam (part 1) The polyurethane foam is obtained from a composition (hereinafter also referred to as a "polyurethane resin composition") obtained by mixing at least a polyol, a foam stabilizer, a blowing agent, and an isocyanate. The apparent density of the polyurethane foam is 50 kg / m 3The polyurethane resin composition contains one or more compounds selected from the group consisting of alkali metal salts and alkaline earth metal salts.

[0012] (1) Polyol The polyol is not particularly limited, and various polyols may be used alone or in combination of two or more kinds. Examples of the polyol include polyether polyol, polyester polyol, polyether ester polyol, polycarbonate diol, and polyol having a carbon-carbon bond main chain. 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 polyols such as polybutadiene polyol and isoprene polyol, and acrylic polyol.

[0013] (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.

[0014] (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.

[0015] (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.

[0016] (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.

[0017] (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

[0018] (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

[0019] (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.

[0020] (1.4) Polyolefin polyols Examples of polyolefin polyols include polybutadiene polyols, polyisoprene polyols, hydrogenated polybutadiene polyols, and hydrogenated polyisoprene polyols.

[0021] (1.5) Plant-derived polyols The polyol may contain a plant-derived polyol in addition to the above polyols. 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 to 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.

[0022] (2) Catalyst A catalyst may be added to the polyurethane resin composition. 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 or a quaternary ammonium salt catalyst can be used. Specific examples of these catalysts are shown below. Tertiary amine catalysts such as N,N-dimethylaminohexanol, triethylenediamine, triethylamine, tripropylamine, triisopropanolamine, tributylamine, trioctylamine, hexadecyldimethylamine, N-methylmorpholine, N-ethylmorpholine, N-octadecylmorpholine, monoethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine, N,N-dimethylethanolamine, N,N-dimethylaminoethoxyethoxyethanol, and N,N-dimethylaminoethoxyethanol; formate and other salts of triethylenediamine; oxyalkylene adducts of amino groups of primary and secondary amines; azacyclic compounds such as N,N',N'-dialkylpiperazines; various N,N',N'-trialkylaminoalkylhexahydrotriazines; and amine catalysts having amino groups as functional groups such as N,N,N",N"-tetramethyldiethylenetriamine. Among the amine catalysts, reactive amine catalysts are preferred. The reactive amine catalyst has a functional group that reacts with isocyanate, and is preferably an amine compound having at least one OH group (e.g., N,N-dimethylaminohexanol). In addition, quaternary ammonium salt catalysts such as tetraalkylammonium halides such as tetramethylammonium chloride, tetraalkylammonium hydroxides such as tetramethylammonium hydroxide salts, and tetraalkylammonium organic acid salts such as tetramethylammonium 2-ethylhexanoate, 2-hydroxypropyltrimethylammonium formate, and 2-hydroxypropyltrimethylammonium 2-ethylhexanoate can also be used. In the polyurethane resin composition, the amount of one or more catalysts selected from the group consisting of amine catalysts and quaternary ammonium salt catalysts is not particularly limited. The amount (total amount) of these catalysts is preferably 0 parts by mass or more and 1 part by mass or less, more preferably 0 parts by mass or more and 0.5 parts by mass or less, and even more preferably 0 parts by mass or more and 0.3 parts by mass or less, relative to 100 parts by mass of polyol.

[0023] As the catalyst, a metal catalyst (organometallic catalyst) can be used. As the metal catalyst, any conventionally known metal catalyst can be used without any particular limitation. Examples of the metal catalyst that can be used include metal salts of Sn (tin), Pb (lead), Bi (bismuth), Ni (nickel), Co (cobalt), Fe (iron), Zr (zirconium), Cu (copper), Zn (zinc), etc., and organic acid metal salts. More specifically, the following metal catalysts can be used. Sn catalyst: tin(II) octoate (tin 2-ethylhexanoate, stannous dioctoate), tin(II) acetate, stannous diacetate, tin(II) octanoate, tin stannous dioleate, tin(II) neodecanoate, stannous dilaurate, dibutyltin oxide, dibutyltin diacetate, dibutyltin dilaurate, dibutyltin dichloride, dioctyltin dilaurate, dibutyltin dimaleate, dioctyltin diacetate, etc. Pb catalyst: lead octoate, lead naphthenate, etc. Bi catalyst: bismuth octoate, bismuth naphthenate, bismuth neodecanoate, bismuth rosinate, etc. Fe catalyst: iron acetylacetonate, etc. Zr catalyst: zirconium acetylacetonate, etc. Ni catalyst: Nickel acetylacetonate, nickel octylate, nickel naphthenate, etc. Co catalyst: cobalt acetylacetonate, cobalt octylate, cobalt naphthenate, etc.

[0024] The amount of the metal catalyst in the polyurethane resin composition is not particularly limited. The amount of the metal catalyst is preferably 0 parts by mass or more, more preferably 0.05 parts by mass or more, and even more preferably 0.1 parts by mass or more, relative to 100 parts by mass of polyol, from the viewpoint of sufficiently promoting the polyurethane production reaction. On the other hand, from the viewpoint of suppressing volatile organic compounds (such as 2-ethylhexanoic acid) derived from the metal catalyst, it is preferably 1.0 parts by mass or less, more preferably 0.5 parts by mass or less, and even more preferably 0.30 parts by mass or less. From these viewpoints, the amount of the metal catalyst is preferably 0 parts by mass or more and 1.0 parts by mass or less, more preferably 0.01 parts by mass or more and 0.5 parts by mass or less, and even more preferably 0.05 parts by mass or more and 0.3 parts by mass or less, relative to 100 parts by mass of polyol.

[0025] (3) Foam stabilizer The foam stabilizer is not particularly limited. Specific examples of the foam stabilizer include silicone compounds (silicone foam stabilizers) such as organopolysiloxane, organopolysiloxane-polyoxyalkylene copolymer, polyalkenylsiloxane having a polyoxyalkylene side chain, silicone-grease copolymer, etc., anionic surfactants such as sodium dodecylbenzenesulfonate and sodium lauryl sulfate, polyether siloxane, phenolic compounds, etc. These foam stabilizers may be used alone or in combination of two or more kinds. The amount of the foam stabilizer is not particularly limited, but is preferably 0.03 parts by mass or more and 5.0 parts by mass or less with respect to 100 parts by mass of the polyol.

[0026] (4) Foaming agent The blowing agent is not particularly limited. As the blowing agent, water, pentane, cyclopentane, hexane, cyclohexane, dichloromethane (methylene chloride), carbon dioxide gas, etc. are preferably used. When the blowing agent is water, the amount added is determined within a range in which the desired density and good foaming state are obtained in the polyurethane foam, and usually, 1 part by mass or more and 5 parts by mass or less are preferable for 100 parts by mass of polyol.

[0027] (5) Isocyanates (polyisocyanates) The isocyanate 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. At least one aliphatic isocyanate and at least one aromatic isocyanate may be used in combination. From the viewpoint of effectively suppressing static electricity, it is preferable to use an aromatic isocyanate having an electrically suitable aromatic ring (e.g., a benzene ring, etc.), and it is particularly preferable to use only aromatic isocyanates as the isocyanate. The isocyanate 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 ylene 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.

[0028] The mixing ratio of isocyanate and polyol is not particularly limited. The isocyanate index is preferably 80 or more and 120 or less. The isocyanate index (INDEX) is a value obtained by multiplying the number of moles of isocyanate groups per mole of active hydrogen groups contained in a polyurethane resin composition by 100, and is calculated by [(isocyanate equivalent in composition / active hydrogen equivalent in composition)×100].

[0029] (6) One or more compounds selected from the group consisting of alkali metal salts and alkaline earth metal salts. (6.1) Alkali metal salts Examples of the alkali metal constituting the alkali metal salt include potassium (K), sodium (Na), and lithium (Li). The alkali metal salt may be any of a potassium salt, a sodium salt, and a lithium salt. The potassium salt is not particularly limited. From the viewpoint of high scavenging effect of volatile organic compounds such as 2-ethylhexanoic acid, examples of the potassium salt include inorganic acid salts and organic acid salts such as potassium benzoate, potassium chloride, potassium acetate, potassium oxalate, potassium carbonate, potassium hydrogen carbonate, potassium thiocyanate, tripotassium phosphate, dipotassium hydrogen phosphate, potassium laurate, potassium succinate, dipotassium adipate, and dipotassium malonate, and among these, one or more compounds selected from the group consisting of potassium carbonate, potassium hydrogen carbonate, potassium acetate, tripotassium phosphate, and potassium laurate are preferred. The sodium salt is not particularly limited. From the viewpoint of high scavenging effect of volatile organic compounds such as 2-ethylhexanoic acid, examples of the sodium salt include sodium benzoate, sodium chloride, sodium acetate, sodium oxalate, sodium carbonate, sodium hydrogen carbonate, trisodium phosphate, sodium hydrogen carbonate, sodium succinate, and disodium malonate, and among these, one or more compounds selected from the group consisting of sodium carbonate and sodium chloride are preferred. The lithium salt is not particularly limited. From the viewpoint of high scavenging effect of volatile organic compounds such as 2-ethylhexanoic acid, examples of the lithium salt include lithium benzoate, lithium chloride, lithium acetate, lithium oxalate, lithium carbonate, lithium hydrogen carbonate, lithium thiocyanate, lithium phosphate, and lithium hydrogen phosphate.

[0030] (6.2) Alkaline earth metal salts Examples of the alkali metal that constitutes the alkaline earth metal salt include calcium (Ca) and magnesium (Mg). The alkaline earth metal salt may be either a calcium salt or a magnesium salt. The calcium salt is not particularly limited. From the viewpoint of high scavenging effect of volatile organic compounds such as 2-ethylhexanoic acid, examples of calcium salts include calcium benzoate, calcium chloride, calcium acetate, calcium hydrogen carbonate, calcium lactate, and calcium dihydrogen phosphate, and among these, one or more compounds selected from the group consisting of calcium acetate and calcium lactate are preferred. The magnesium salt is not particularly limited. As the magnesium salt, one or more compounds selected from the group consisting of magnesium chloride and magnesium acetate are preferred from the viewpoint of high scavenging effect of volatile organic compounds such as 2-ethylhexanoic acid.

[0031] (6.3) Solubility in water of one or more compounds selected from the group consisting of alkali metal salts and alkaline earth metal salts (hereinafter also referred to as "the compounds"). The solubility of the compound in water is not particularly limited. The solubility of the compound in 100 g of water at 20°C is preferably 80 (g) or more, more preferably 100 (g) or more, and even more preferably 110 (g) or more, from the viewpoint of facilitating the production of polyurethane foam, increasing the dispersibility of ions in the raw material solution and polyurethane foam, suppressing the generation of static electricity, and increasing the effect of capturing volatile organic compounds such as 2-ethylhexanoic acid. The upper limit of the solubility of the compound in 100 g of water at 20°C is not particularly limited, but is usually 300 (g). The solubility of the compound in 100 g of water at 20°C is preferably 80 (g) or more and 300 (g) or less, more preferably 100 (g) or more and 300 (g) or less, and even more preferably 110 (g) or more and 300 (g) or less.

[0032] (6.4) Amount of one or more compounds selected from the group consisting of alkali metal salts and alkaline earth metal salts (hereinafter also referred to as "the compounds") The amount of the compound in the polyurethane resin composition is not particularly limited, and may be any amount as long as it is present. The amount of the compound is preferably 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, and even more preferably 0.3 parts by mass or more, relative to 100 parts by mass of polyol, from the viewpoint of suppressing the generation of static electricity. On the other hand, from the viewpoint of maintaining the various physical properties of polyurethane foam and from the viewpoint of production cost, it is preferably 3.0 parts by mass or less, more preferably 2.0 parts by mass or less, and even more preferably 1.0 parts by mass or less. From these viewpoints, the amount of the compound is preferably 0.01 parts by mass or more and 3.0 parts by mass or less, more preferably 0.1 parts by mass or more and 2.0 parts by mass or less, and even more preferably 0.3 parts by mass or more and 1.0 parts by mass or less, relative to 100 parts by mass of polyol. In addition, it is considered that the effect of suppressing the generation of VOCs is affected by the ratio of the amount of the compound to the metal catalyst tin octoate (tin compound). From this viewpoint, the amount of the compound is preferably 0.1 mol or more, more preferably 1 mol or more, and more preferably 10 mol or more per 1.0 mol of tin octoate (tin compound).

[0033] (6.5) Other Additives The polyurethane resin composition may contain other additives, such as crosslinking agents, plasticizers, flame retardants, fillers, antioxidants, ultraviolet absorbers, defoamers, compatibilizers, colorants, stabilizers, antibacterial agents, antifungal agents, deodorants, deodorants, fragrances, and flavorings, as appropriate. Examples of crosslinking agents include short-chain diol crosslinking agents such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,4-butanediol, glycerin, and trimethylolpropane. Examples of coloring agents include pigments, dyes, and coloring agents.

[0034] (7) Capture mechanism of volatile organic compounds in polyurethane foam The mechanism of capturing volatile organic compounds will be described below. An example will be given in which liquid tin octoate is included. In this case, 2-ethylhexanoic acid is produced from the tin octoate. In a conventional formulation, 2-ethylhexanoic acid volatilizes from polyurethane foam and becomes VOC. In the case of the polyurethane foam of this embodiment, "alkali metal ions (K ions)" derived from one or more compounds selected from the group consisting of alkali metal salts and alkaline earth metal salts are generated. + (Potassium ion), Na + (sodium ion), Li + (lithium ion))" "Alkaline earth metal ion (Ca 2+ (Calcium ion), Mg 2+ It is presumed that "(magnesium ion)" combines (ionic bond) with 2-ethylhexanoic acid to produce potassium octylate, sodium octylate, lithium octylate, calcium octylate, and magnesium octylate (hereinafter referred to as "potassium octylate, etc."). Since potassium octylate, etc., is a solid at room temperature, it does not volatilize, and it is presumed that the generation of VOCs is suppressed.

[0035] (8) Physical properties of polyurethane foam The physical properties of the polyurethane foam can be appropriately set depending on the application, etc. The polyurethane foam is preferably a flexible polyurethane foam. (8.1) Apparent density Apparent density (JIS K7222) is 50kg / m 3 Less than 40kg / m 3 Less than 30kg / m is preferable. 3 The lower the density of the polyurethane foam, the more easily it becomes charged when it is cut with a blade or the like, so the static electricity suppression effect is more effectively exhibited at the above-mentioned low densities. The lower limit of the apparent density is not particularly limited. The lower limit is set to 10 kg / m from the viewpoint of suppressing the rise in heat generation temperature during foaming of a low-density product and ensuring stable production. 3 More than 15kg / m is preferable. 3 From these viewpoints, the apparent density is preferably 10 kg / m 3More than 50kg / m 3 Less than 15kg / m is preferable. 3 More than 40kg / m 3 Less than 15kg / m is more preferable. 3 More than 30kg / m 3 The following is even more preferred:

[0036] (8.2) Volume resistivity The volume resistivity of polyurethane foam is set at 1×10 14 The volume resistivity is preferably Ωcm or less. The lower limit of the volume resistivity is not particularly limited. A suitable range of the volume resistivity is, for example, 1×10 12 Ωcm~1×10 14 In addition, in the case of conductive foam, for example, 1×10 9 Ωcm~1×10 14 It is Ωcm. The volume resistivity is measured under the following conditions in accordance with JIS K6911-1995 (5.13). Measurement environmental conditions Temperature: 23℃ (±2℃) Humidity: 50% (±5%) Voltage: 500V

[0037] (8.3) Hardness The hardness (JIS K6400-2 D method) is preferably 10 N to 600 N, more preferably 20 N to 400 N. If it is 600 N or less, the polyurethane foam is highly flexible and is preferable as a flexible polyurethane foam.

[0038] (8.4) Resilience The impact resilience (JIS K6400-3) is preferably from 1% to 80%, and more preferably from 5% to 70%.

[0039] (8.5) Tensile strength, elongation The tensile strength (JIS K6400-5) is preferably 30 kPa or more, and more preferably 50 kPa or more. The elongation (JIS K6400-5) is preferably 50% to 500%. If it is 50% or more, the polyurethane foam is highly flexible and is preferable as a flexible polyurethane foam.

[0040] 2. Polyurethane foam (part 2) In the polyurethane foam, one or more elements selected from the group consisting of alkali metals and alkaline earth metals are detected by qualitative analysis. The polyurethane foam is usually obtained from a composition ("polyurethane resin composition") that is a mixture of at least a polyol, a foam stabilizer, a blowing agent, and an isocyanate. Alkali metals can be detected by ICP atomic emission spectrometry, while potassium can also be detected by XRF qualitative analysis. Alkaline earth metals can be detected by ICP atomic emission spectrometry. If one or more selected from the group consisting of alkali metals and alkaline earth metals are detected in a qualitative analysis of a polyurethane foam, it means that one or more selected from the group consisting of alkali metals and alkaline earth metals remain in the polyurethane foam. In this case, there is a possibility that one or more selected from the group consisting of the above-mentioned alkali metal salts and alkaline earth metal salts remain, and the generation of static electricity is suppressed. If the alkali metal content is 500 ppm or more, the generation of static electricity is sufficiently suppressed. The upper limit of the alkali metal content is usually 5000 ppm or less. If the alkaline earth metal content is 500 ppm or more, the generation of static electricity is sufficiently suppressed. The upper limit of the alkaline earth metal content is usually 5000 ppm or less. In polyurethane foam (part 2), the explanations in the "Polyurethane foam (part 1)" section for "Polyurethane foam (part 2)" apply as is for "Polyol", "Catalyst", "Foam stabilizer", "Blowing agent", and "Isocyanate", and their descriptions are omitted. In other words, the "Polyol", "Catalyst", "Foam stabilizer", "Blowing agent", and "Isocyanate" explained in the "Polyurethane foam (part 1)" section apply as is.

[0041] 3.Applications The applications of the polyurethane foam of the present disclosure are not particularly limited. The polyurethane foam of the present disclosure is suitably used for food containers, packaging materials, sponges for hydroponic cultivation, furniture, bedding, household goods (kitchen sponges, etc.), etc.

[0042] 4. Polyurethane foam production Polyurethane foam can be produced by a known foaming method in which a polyurethane resin composition is stirred and mixed to react with a polyol and an isocyanate. The foaming method includes slab foaming and mold foaming, and either molding method may be used. Slab foaming is a method in which a mixed polyurethane resin composition is discharged onto a belt conveyer and foamed at atmospheric pressure and room temperature. On the other hand, mold foaming is a method in which a mixed polyurethane resin composition is filled into a mold (forming die) and foamed in the mold. EXAMPLES

[0043] 1. Polyurethane foam production Polyurethane resin compositions having the compositions shown in Tables 1 and 2 were prepared, and polyurethane foams of the examples and comparative examples were produced by slab foaming. The details of each raw material are as follows: Polyol: Polyether polyol, functional group number 3, molecular weight 3000, hydroxyl value 56mgKOH / g, product name: CARADOL56-16, manufactured by SHELL Foaming agent: water Methylene chloride Alkali metal salts: K2CO3 CH3COOK Antistatic agent Elegant LD-204 by NOF Corporation Amine catalyst: Kao Raiser No. 25 (N,N-Dimethylaminohexanol) manufactured by Kao Corporation Kao Raiser No.81 manufactured by Kao Corporation TEDA33 (C6H 12 N2, Triethylene Diamine) manufactured by Tosoh Corporation U-CAT 18X ​​(quaternary ammonium salt) manufactured by San-Apro Co., Ltd. Tin octoate catalyst (Tin octoate catalyst) MRH110 manufactured by Johoku Chemical Industry Co., Ltd. Silicone foam stabilizer B8110 manufactured by Evonik Silicone foam stabilizer B8244 manufactured by Evonik Isocyanate: Toluene diisocyanate (TDI) Coronate T-80, 2,4 / 2,6 isomers in an 80 / 20 ratio, manufactured by Tosoh Corporation Isocyanate: Toluene diisocyanate (TDI) Coronate T-65 2,4 / 2,6 isomer ratio 65 / 35 manufactured by Tosoh Corporation

[0044] Specifically, the polyurethane foam was produced according to the following procedure. The raw materials other than the isocyanate were weighed and mixed in a cup container to prepare a mixed solution. Metal salts such as potassium carbonate were dissolved in water and mixed with the polyol. Isocyanate was added to the mixed solution and stirred to obtain a polyurethane resin composition.

[0045] [Table 1]

[0046] [Table 2]

[0047] 2. Evaluation method (1) Apparent density (density) The apparent density was measured according to JIS K7222 as described in section (8.1) above. (2) Volume resistivity The volume resistivity was measured according to JIS K6911-1995 as described in section (8.2) above. (3)VOC value To measure the VOC value, a 7 mg test piece was prepared from each sample, placed in a glass tube, and a thermal desorption device was used to carry out the VOC measurement method stipulated in the German Association of the Automotive Industry VDA278. Specifically, each test piece was heated at 90°C for 30 minutes, and the gas generated during heating was analyzed using a gas chromatograph mass spectrometer to calculate the VOC value. (4) Odor sensory test The odor sensory test was carried out according to the following test method. Test method: A 100x100x10mm urethane foam sample was placed in an odorless 5L plastic bag and five people smelled it. The following evaluation criteria were used. The results were the average of the five people. The odor in this test was mainly due to the raw materials. <Evaluation criteria> Odor Intensity 5: Strong odor 4: Strong odor 3. Easily detectable odors 2: A weak smell that you can identify 1: Perceivable odor 0: Odorless -Odor quality (pleasantness / unpleasantness) -3: Very uncomfortable -2: Unpleasant -1: Somewhat uncomfortable 0: Neither pleasant nor unpleasant 1: Somewhat comfortable 2: Pleasure 3: Very comfortable

[0048] 3.Results The results are shown in Tables 1 and 2.

[0049] It was found that the polyurethane foams of Examples 1 to 7 had low volume resistivity and suppressed the generation of static electricity even without the use of an antistatic agent. The polyurethane foams of Examples 1 to 7 had volume resistivity values ​​equivalent to that of Comparative Example 3, which used an antistatic agent. On the other hand, the polyurethane foams of Comparative Examples 1 and 2 had high volume resistivity values ​​and were prone to generating static electricity. The polyurethane foams of Examples 1, 4 and 5 had lower VOC measurement values ​​than the polyurethane foams of Comparative Examples 1, 2 and 3. The polyurethane foam of Example 1 was evaluated as being more favorable than the polyurethane foams of Comparative Examples 1 and 2 in the odor sensory test.

[0050] 4. Effects of the embodiment According to the above examples, it is possible to provide a polyurethane foam in which the generation of static electricity is suppressed without using an antistatic agent. The polyurethane foam of the examples has an excellent effect of capturing volatile organic compounds. The polyurethane foam of the examples also suppresses odors derived from the raw materials.

[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. at least A polyol, A foam stabilizer, A foaming agent; A static suppression polyurethane foam obtained from a composition comprising a mixture of an isocyanate and The apparent density is 50 kg / m ３ is as follows: The composition includes one or more compounds selected from the group consisting of potassium salts and alkaline earth metal salts; A polyurethane foam having a volume resistivity measured in accordance with JIS K6911 of 1×10 14 Ωcm or less (excluding polyurethane foams having an isocyanate index of 150 or more).

2. at least A polyol, A foam stabilizer, A foaming agent; A static suppression polyurethane foam obtained from a composition comprising a mixture of an isocyanate and The apparent density is 50 kg / m ３ is as follows: The composition includes one or more compounds selected from the group consisting of potassium salts, sodium salts, and alkaline earth metal salts; A polyurethane foam having a volume resistivity of 1 x 10 14 Ωcm or less, measured in accordance with JIS K6911 (excluding polyurethane foams having an isocyanate index of 150 or more, polyurethane foams containing sodium bicarbonate, polyurethane foams containing sodium carbonate, and polyurethane foams containing a sodium salt of an organic solid acid).

3. at least A polyol, A foam stabilizer, A foaming agent; A static suppression polyurethane foam obtained from a composition comprising a mixture of an isocyanate and The apparent density is 50 kg / m ３ is as follows: The composition includes one or more compounds selected from the group consisting of potassium salts, lithium salts, and alkaline earth metal salts; A polyurethane foam having a volume resistivity of 1 x 10 14 Ωcm or less as measured in accordance with JIS K6911 (excluding polyurethane foams containing a quaternary ammonium salt represented by the following general formula (I) in the composition and polyurethane foams having an isocyanate index of 150 or more). R, R', R'', and R''' are each a group having 1 to 4 carbon atoms, and any of R, R', R'', and R''' has one or more reactive groups having active hydrogen that reacts with isocyanate. X is an anionic group.

4. at least A polyol, A foam stabilizer, A foaming agent; A static suppression polyurethane foam obtained from a composition comprising a mixture of an isocyanate and The apparent density is 50 kg / m ３ is as follows: The composition includes one or more compounds selected from the group consisting of alkali metal salts and alkaline earth metal salts; A polyurethane foam having a volume resistivity of 1 x 10 Ωcm or less, measured in accordance with JIS K6911 (excluding polyurethane foams containing a quaternary ammonium salt represented by the following general formula (I) in the composition, polyurethane foams having an isocyanate index of 150 or more, polyurethane foams containing sodium bicarbonate, polyurethane foams containing sodium carbonate, and polyurethane foams containing a sodium salt of an organic solid acid): R, R', R'', and R''' are each a group having 1 to 4 carbon atoms, and any of R, R', R'', and R''' has one or more reactive groups having active hydrogen that reacts with isocyanate. X is an anionic group.

5. at least A polyol, A foam stabilizer, A foaming agent; A static suppression polyurethane foam obtained from a composition comprising a mixture of an isocyanate and The apparent density is 50 kg / m ３ is as follows: The composition includes one or more compounds selected from the group consisting of potassium salts, sodium salts, and alkaline earth metal salts; The compound is a polyurethane foam having a solubility of 80 or more in 100 g of water at 20° C. (excluding polyurethane foams having an isocyanate index of 150 or more).

6. at least A polyol, A foam stabilizer, A foaming agent; A static suppression polyurethane foam obtained from a composition comprising a mixture of an isocyanate and The apparent density is 50 kg / m ３ is as follows: The composition includes one or more compounds selected from the group consisting of alkali metal salts and alkaline earth metal salts; The compound has a solubility of 80 or more in 100 g of water at 20°C (excluding polyurethane foams containing a quaternary ammonium salt represented by the following general formula (I) in the composition and polyurethane foams having an isocyanate index of 150 or more). R, R', R'', and R''' are each a group having 1 to 4 carbon atoms, and any of R, R', R'', and R''' has one or more reactive groups having active hydrogen that reacts with isocyanate. X is an anionic group.

7. One or more elements selected from the group consisting of potassium and alkaline earth metals are detected by qualitative analysis; The apparent density is 50 kg / m ３ is as follows: The volume resistivity measured in accordance with JIS K6911 is 1×10 Ωcm or less; A polyurethane foam that satisfies at least one of the following (A) and (B): (A) Hardness (JIS K6400-2 D method) is 10N to 600N. (B) Elongation (JIS K6400-5) is 50% to 500%.

8. One or more metals selected from the group consisting of alkali metals and alkaline earth metals are detected by qualitative analysis; The apparent density is 50 kg / m ３ is as follows: The volume resistivity measured in accordance with JIS K6911 is 1×10 Ωcm or less; The method uses, as raw materials, at least one compound selected from the group consisting of alkali metal salts and alkaline earth metal salts (excluding potassium formate and sodium hydrogen carbonate) and a polyol, The amount of the compound is 2.0 parts by mass or less per 100 parts by mass of the polyol (excluding those using a quaternary ammonium salt represented by the following general formula (I) as a raw material). R, R', R'', and R''' are each a group having 1 to 4 carbon atoms, and any of R, R', R'', and R''' has one or more reactive groups having active hydrogen that reacts with isocyanate. X is an anionic group.

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