Polyurethane foam

Abstract

A polyurethane foam obtained from a composition for polyurethane foams containing a polyol component, a polyisocyanate, a foaming agent, and a catalyst, the polyurethane foam being characterized in that: the polyol component contains a plant-derived polyol and a polymer polyol; the composition for polyurethane foams has a plant degree of 15% or more and an air permeability (JIS K 6400-7: 2012A method) of 10 L / min or less, as expressed by weight% of the plant-derived polyol contained in the composition for polyurethane foams.

Description

Technical Field

[0001] The present disclosure relates to a polyurethane foam suitable as a sound insulation material. Background Art

[0002] For example, in automobiles, sound insulation materials made of polyurethane foam are arranged on the sound transmission path in fenders, instrument panels, hood peripheries, etc. to suppress the transmission of noise into the vehicle (Japanese Patent Application Laid-Open No. 2013-246182). Summary of the invention

[0003] Problems to be solved by the invention

[0004] Generally speaking, if the sound insulation materials are made of the same material, the heavier the material, the higher the sound insulation effect.

[0005] However, in automobiles, lightness is required from the viewpoint of improving the fuel efficiency of the automobile, and therefore increasing the weight of the polyurethane foam to improve the sound insulation is not preferable.

[0006] Furthermore, from the viewpoint of reducing environmental load in recent years, there is a demand for using plant-derived resins obtained from plant resources instead of petroleum-derived resins obtained from petroleum resources as raw materials.

[0007] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide a polyurethane foam that can obtain good sound insulation even when the weight is reduced and contribute to reducing environmental load.

[0008] Means of solving problems

[0009] The first aspect is a polyurethane foam obtained from a polyurethane foam composition containing a polyol component, a polyisocyanate, a blowing agent, and a catalyst. In the polyurethane foam, the polyol component contains a plant-derived polyol and a polymer polyol, the plant content expressed as the weight % of the plant-derived polyol contained in the polyurethane foam composition is 15% or more, and the air permeability (JIS K 6400-7:2012A method) is 10 L / min or less.

[0010] In a second aspect, in addition to the first aspect, the total amount of the plant-derived polyol and the polymer polyol in the polyol component is 86% by weight or more.

[0011] Regarding a third aspect, in the first aspect or the second aspect, an average sound transmission loss (JIS A1441-1:2007) at a frequency of 1000 to 6300 Hz is 30 dB or more.

[0012] In a fourth aspect, in any one of the first to third aspects, the density is 100 to 160 kg / m3 .

[0013] In a fifth aspect, in any one of the first to fourth aspects, the surface hardness is 30 or less in Asker C hardness.

[0014] Effects of the Invention

[0015] According to the present disclosure, it is possible to obtain a polyurethane foam which has good sound insulation even when the weight is reduced and which contributes to reducing environmental load. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a table showing the formulation of the polyurethane foam composition of each Example and each Comparative Example, the physical properties of the polyurethane foam, and the like. DETAILED DESCRIPTION

[0017] This application is based on Special Application No. 2022-119350 filed in Japan on July 27, 2022, and the disclosure of the basic application is incorporated into this application by reference. The present invention will be more fully understood through the following detailed description. The further scope of application of the present invention becomes clear through the following detailed description. However, the detailed description and specific embodiments are preferred embodiments of the present invention and are described for illustrative purposes only. This is because, according to the detailed description, various changes and modifications are obvious to those skilled in the art within the spirit and scope of the present invention. The applicant does not intend to make any of the described embodiments public, and according to the theory of equivalents, the contents of the changes and substitutions that may not be included in the claims in words are also part of the present invention.

[0018] Next, embodiments of the present invention will be described.

[0019] The polyurethane foam disclosed in the present invention is obtained from a polyurethane foam composition, which contains a polyol component, a polyisocyanate, a blowing agent, and a catalyst. By stirring the polyurethane foam composition, the polyol component and the polyisocyanate react and foam to form a polyurethane foam.

[0020] The polyol component includes plant-derived polyols and polymer polyols. Plant-derived polyols are polyols produced using plant-derived raw materials, such as vegetable oils. Plant-derived polyols have 2 to 4 functional groups and preferably have a molecular weight of 600 to 5000, more preferably 800 to 4000, and even more preferably 900 to 3000.

[0021] Examples of plant-derived raw material vegetable oils include castor oil, sunflower seed oil, rapeseed oil, linseed oil, cottonseed oil, tung oil, coconut (palm) oil, poppy seed oil, corn oil, and soybean oil. Among them, castor oil polyol produced using castor oil as a raw material is an example of a suitable plant-derived polyol in the present disclosure.

[0022] The castor oil polyol may be either a modified castor oil polyol or an unmodified castor oil polyol, or may contain both.

[0023] Examples of the modified castor oil polyol include transesterification products of castor oil and fats other than castor oil, transesterification products of castor oil and fat fatty acids, transesterification products of castor oil and polyols, esterification products of castor oil fatty acids and polyols, esterification products of a part of hydroxyl groups contained in castor oil and monocarboxylic acids such as acetic acid, products obtained by addition polymerization of alkylene oxides to the above chemical substances, and hydrogenated products obtained by adding hydrogen to the above chemical substances.

[0024] Examples of the unmodified castor oil polyol include purified castor oil polyol, semi-refined castor oil polyol, and unrefined castor oil polyol.

[0025] Various types of plant-derived polyols can be used.

[0026] The amount of the plant-derived polyol is preferably an amount having a plant content of 15% or more, more preferably an amount of 20% or more, and further preferably an amount of 25% or more. The plant content (%) in the present disclosure is a value expressed as a weight % of the plant-derived polyol contained in the polyurethane foam composition, and is calculated by [plant content (%) = (weight of plant-derived polyol / total weight of the polyurethane foam composition) × 100].

[0027] As polymer polyols, there can be cited polymer polyols obtained by graft polymerization of acrylonitrile, styrene, etc. on polyether polyols and microdispersing acrylonitrile, styrene, etc. The number of functional groups of the polymer polyol is 2 to 4, and the molecular weight is preferably 2000 to 7000, more preferably 2500 to 6500, and further preferably 3000 to 6000. Two or more polymer polyols can be used in combination. By including polymer polyols in the polyol component, it is possible to adjust the excessive reduction in the air permeability of the polyurethane foam caused by the plant-derived polyol. If the air permeability of the polyurethane foam is reduced too much, it may be difficult to compress and deform, and it is difficult to compress and insert and arrange in the sound transmission path, and the foam is easy to shrink during molding, so that the moldability is poor.

[0028] The amount of the polymer polyol is, for example, preferably 10 to 80% by weight, more preferably 20 to 70% by weight, and further preferably 30 to 60% by weight based on 100% by weight of the polyol component.

[0029] The total amount of the plant-derived polyol and the polymer polyol in 100% by weight of the polyol component is, for example, preferably 86% by weight or more, more preferably 88% by weight or more, and even more preferably 90% by weight or more.

[0030] The polyol component may contain a petroleum-derived polyol together with the plant-derived polyol and the polymer polyol. The inclusion of the petroleum-derived polyol improves the moldability and productivity of the polyurethane foam.

[0031] The petroleum-derived polyol in the present disclosure is a polyol other than a plant-derived polyol and a polymer polyol, and may be any one of a polyether polyol, a polyester polyol, a polyether ester polyol, etc., or one or more thereof. The petroleum-derived polyol has 2 to 4 functional groups and preferably has a molecular weight of 100 to 10,000, more preferably 400 to 8,000, and further preferably 700 to 7,000.

[0032] The amount of the petroleum-derived polyol is the remainder of the plant-derived polyol and the polymer polyol in 100 wt % of the polyol component, and is, for example, preferably less than 14 wt %, more preferably less than 12 wt %, and further preferably less than 10 wt %.

[0033] The polyisocyanate is not particularly limited as long as it is a compound having two or more isocyanate groups, and polyisocyanates for polyurethane foam can be used. The polyisocyanate is not limited to one type, and two or more types can also be used in combination. As the polyisocyanate, aromatic, aliphatic, alicyclic isocyanate compounds and their modified products can be listed.

[0034] As aromatic isocyanate compounds, diphenylmethane diisocyanate (MDI), crude diphenylmethane diisocyanate, toluene diisocyanate (TDI), naphthalene diisocyanate (NDI), p-phenylene diisocyanate (PPDI), meta-xylylene diisocyanate (XDI), tetramethyl meta-xylylene diisocyanate (TMXDI), dimethyl biphenyl diisocyanate (TODI), etc. can be listed. As aliphatic isocyanate compounds, hexamethylene diisocyanate (HDI), lysine diisocyanate (LDI), lysine triisocyanate (LTI) can be listed. As alicyclic isocyanate compounds, isophorone diisocyanate (IPDI), cyclohexane diisocyanate (CHDI), hydrogenated XDI (H6XDI), hydrogenated MDI (H12MDI), etc. can be listed. Examples of the modified isocyanate compound include urethane-modified isocyanate compounds, dimers, trimers, carbodiimide-modified isocyanate compounds, allophanate-modified isocyanate compounds, biuret-modified isocyanate compounds, urea-modified isocyanurate-modified isocyanate compounds, oxazolidinone-modified isocyanate-terminated prepolymers, and the like.

[0035] The amount of polyisocyanate blended is preferably such that the isocyanate index is 70 to 110. When the isocyanate index is less than 70, the strength of the polyurethane foam becomes too low, the durability is poor, the gas is difficult to leak out and shrinks, and the molding state deteriorates. On the other hand, when the isocyanate index exceeds 110, the polyurethane foam has high hardness and the polyurethane foam is difficult to deform into the shape of the bonding surface.

[0036] The isocyanate index is a value expressing the equivalent ratio of the isocyanate groups of the polyisocyanate to the total active hydrogen groups in the polyurethane foam composition (e.g., hydroxyl groups of the polyol, active hydrogen groups such as water used as a blowing agent) as a percentage, and is an index used in the field of polyurethane foams.

[0037] Examples of the foaming agent include water, hydrocarbons, and halogen compounds, and one or more of these may be used.

[0038] Examples of the hydrocarbon include cyclopentane, isopentane, and n-pentane.

[0039] Examples of the halogen compounds include dichloromethane, trichlorofluoromethane, dichlorodifluoromethane, nonafluorobutyl methyl ether, nonafluorobutyl ethyl ether, pentafluoroethyl methyl ether, and heptafluoroisopropyl methyl ether.

[0040] Among them, water is preferred as a foaming agent. The amount of water as a foaming agent is preferably about 1 to 10% by weight, and more preferably about 1 to 7% by weight, relative to 100% by weight of the polyol component, thereby adjusting the density of the polyurethane foam, etc. Alternatively, it can be 1 to 10 parts by weight, or 1 to 7 parts by weight relative to 100 parts by weight of the polyol component.

[0041] Examples of the catalyst include amine catalysts and metal catalysts.

[0042] Examples of the amine catalyst include N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine, N,N-dimethylaminoethanol, N,N′,N′-trimethylaminoethylpiperazine, and triethylenediamine.

[0043] Examples of the metal catalyst include tin catalysts such as stannous octoate and dibutyltin dilaurate, phenylmercuric propionate, and lead octoate.

[0044] The amount of the catalyst is preferably about 0.1 to 8.0 wt % relative to 100 wt % of the polyol. Alternatively, it may be 0.1 to 8.0 wt % relative to 100 parts by weight of the polyol.

[0045] Furthermore, additives such as a crosslinking agent, a foam stabilizer, a flame retardant, and a colorant are appropriately blended into the polyurethane foam composition.

[0046] Examples of the crosslinking agent include polyols such as ethylene glycol, diethylene glycol, glycerin, butane tetraol, and polyoxypropylene glycol, diethanolamine, and polyamine. The crosslinking agent is not limited to one kind, and multiple kinds may be used in combination.

[0047] The amount of the crosslinking agent is preferably about 0.3 to 5% by weight relative to 100% by weight of the polyol component. Alternatively, it may be 0.3 to 5 parts by weight relative to 100 parts by weight of the polyol component.

[0048] As the foam stabilizer, any foam stabilizer can be used in polyurethane foam, and examples thereof include silicone foam stabilizers, fluorine-containing compound foam stabilizers, and known surfactants. In particular, silicone foam stabilizers are preferred.

[0049] The air permeability (JIS K6400-7: 2012A method) of the polyurethane foam disclosed in the present invention is, for example, preferably less than 10 L / min, more preferably less than 6 L / min, further preferably less than 5 L / min, and particularly preferably less than 4 L / min. By setting the air permeability within this range, good sound insulation can be obtained. In addition, the lower limit is preferably greater than 1 L / min. If the air permeability of the polyurethane foam is reduced too much, it may be difficult to compress and deform, and it is difficult to compress and insert and arrange in the sound transmission path. In addition, the foam is easy to shrink during molding, thereby deteriorating the moldability. Therefore, the lower limit of the air permeability is preferably greater than 1 L / min. In addition, JIS (Japanese Industrial Standards) is a Japanese standard related to mining industry products, processing technology, electromagnetic recording, services, business management, etc.

[0050] The polyurethane foam of the present disclosure has an average sound transmission loss (JIS A1441-1: 2007 / ISO 15186-1: 2000) of 30 dB or more, preferably 32 dB or more at a frequency of 1000 to 6300 Hz. The larger the average sound transmission loss, the higher the sound insulation property.

[0051] The average sound transmission loss at a frequency of 1000 to 6300 Hz is a value obtained by measuring the sound transmission loss in a 1 / 3 octave band (JIS A1441-1: 2007 / ISO 15186-1: 2000) and finding the average sound transmission loss (average transfer loss) at a frequency of 1000 to 6300 Hz.

[0052] The density (JIS K7222: 2005) of the polyurethane foam of the present disclosure is preferably less than 170 kg / m 3 , more preferably less than 160kg / m 3 , further preferably less than 130kg / m 3 By setting the density of the polyurethane foam within the above range, the polyurethane foam can be made lightweight.

[0053] Regarding the polyurethane foam of the present disclosure, the surface hardness based on Asker C hardness is, for example, preferably 30 or less, more preferably 20 or less, and further preferably 10 or less. By setting the surface hardness of the polyurethane foam within the above range, the polyurethane foam can be easily and closely bonded along the wall shape of the sound transmission path, thereby enhancing the sound insulation effect.

[0054] The polyurethane foam disclosed in the present invention preferably has a surface layer (film layer) on the surface. The surface layer is a portion on the surface of the polyurethane foam that is composed of a layer that is denser than the portion on the inner side (center side) of the polyurethane foam. By having a surface layer, the polyurethane foam can reduce the friction resistance with the wall surface when inserted into the gap, and the insertion configuration operation becomes easy. In addition, the presence of the surface layer (film layer) also increases the sound insulation effect.

[0055] The polyurethane foam disclosed in the present invention is produced by stirring the polyurethane foam composition and injecting it into a foaming mold, and then performing molding to foam it. Molding is a widely used method for forming polyurethane foam, and by forming the inner surface of the foaming mold into a product shape, a polyurethane foam of a desired product shape can be obtained without post-processing.

[0056] When molding polyurethane foam, first, apply a release agent to the inner surface of the foaming mold with a brush or sprayer. The foaming mold is embedded with a heating unit such as an electric heater or a heat medium circulation pipe. The temperature can be adjusted to a specified mold temperature by flowing warm water or heating oil in the electric heater or the heat medium circulation pipe. The mold temperature is preferably around 50 to 70°C. When the mold temperature is lower than 50°C, the curing property deteriorates and the productivity deteriorates. On the contrary, when the mold temperature is higher than 70°C, the reactivity of the polyurethane foam composition is too high, so that the fluidity of the polyurethane foam composition deteriorates, and defects may occur in the polyurethane foam, and the surface appearance becomes rough.

[0057] The release agent preferably contains a solid component (wax component) having a first melting peak at 70 to 90°C and a second melting peak at 100 to 130°C. The melting peak is a value obtained by measuring the solid component remaining after evaporation of the liquid component of the release agent by differential scanning calorimetry (DSC). By making the release agent have a first melting peak at 70 to 90°C and a second melting peak at 100 to 130°C, a polyurethane foam having a good surface layer can be obtained.

[0058] The release agent having a first melting peak at 70 to 90°C and a second melting peak at 100 to 130°C preferably contains a branched wax-based release agent. Examples of branched wax-based release agents include release agents using branched waxes such as modified polyethylene wax, microcrystalline wax, and hydrocarbon wax as main components and dissolving them in an organic solvent, or release agents dispersed in water using an emulsifier. The coating amount of the release agent is preferably 10 to 100 g / m 2 .

[0059] After applying a release agent to the inner surface of the foaming mold, the polyurethane foam composition is stirred and injected into the foaming mold, and the foaming mold is closed. The amount of the polyurethane foam composition injected into the foaming mold is an amount corresponding to the density (JIS K7222: 2005) of the obtained polyurethane foam.

[0060] After the polyurethane foam composition is foamed, the foaming mold is opened and the polyurethane foam is demolded.

[0061] Example

[0062] The inner surface of the foaming mold whose inner surface shape is a rectangular parallelepiped is sprayed with a sprayer (at about 25g / m 2 A branched wax-based mold release agent (product name: N-915, manufactured by Chukyo Oil Co., Ltd., melting point: 48°C) was applied as a mold release agent. Figure 1 The polyurethane foam composition having the composition of the formula was stirred, and an amount of the composition to achieve the density set in each embodiment and each comparative example was injected into a foaming mold, and the mold temperature was maintained at 60° C. to allow the composition to foam. The composition was then demolded to obtain the polyurethane foam of each embodiment and each comparative example.

[0063] The foaming mold used for Comparative Examples 1 and 3 had an inner surface size of 500×500×40 mm, and the foaming mold used for Comparative Example 4 and Examples 1 to 3 had an inner surface size of 500×500×30 mm.

[0064] It should be noted that Figure 1 The amount of each component in the formula is "parts by weight", and "total parts" is the total parts by weight of the polyurethane foam composition.

[0065] Polyol A; petroleum source, polyether polyol, molecular weight 5000, number of functional groups 3, hydroxyl value 34mgKOH / g

[0066] Polyol B; Plant origin, castor oil polyol, unmodified (refined), molecular weight 945, number of functional groups 2.7, hydroxyl value 160 mgKOH / g, product name: H-30, manufactured by Ito Oil Manufacturing Co., Ltd.

[0067] Polyol C; Plant-derived, castor oil polyol, modified type, molecular weight about 2000, number of functional groups 3.5, product name: URIC HF2050, manufactured by Ito Oil Manufacturing Co., Ltd.

[0068] Polymer polyol; molecular weight 5000, number of functional groups 3, hydroxyl value 28mgKOH / g

[0069] Cross-linking agent: diethanolamine

[0070] Catalyst; Amine catalyst, product name: DABCO 33LV, manufactured by Evonik Japan

[0071] Foaming agent: water

[0072] Foam stabilizer; Silicone foam stabilizer, product name: SZ1346E, manufactured by Dow Toray Industries, Ltd.

[0073] Polyisocyanate; modified 4,4'-diphenylmethane diisocyanate, product name: Coronate 1050, manufactured by Tosoh Corporation

[0074] The polyurethane foams of each example and each comparative example were subjected to evaluation of moldability, calculation of vegetativeness, measurement of density, dynamic friction coefficient, air permeability, sound transmission loss, and surface hardness, and sound insulation was evaluated based on the results of sound transmission loss.

[0075] Figure 1 The meanings of the symbols indicating the evaluation results are as follows.

[0076] “◎” (double circle): Excellent

[0077] "〇" (circle): Good

[0078] “△“(Triangle): Pass / Average

[0079] “×” (cross): Unqualified / Poor

[0080] Regarding moldability, the polyurethane foam after demolding was visually observed to determine whether there was shrinkage (shrink) or the like. No shrinkage was rated as "good", a slight shrinkage or surface roughness was rated as "acceptable", and significant shrinkage or surface roughness was rated as "unacceptable".

[0081] The plant content is calculated by [(parts of plant-derived polyol / total parts of the composition for polyurethane foam)×100].

[0082] The density was measured in accordance with JIS K7222: 2005. Specifically, it was calculated by [sample weight / sample volume (volume inside the mold)].

[0083] The dynamic friction coefficient is measured in accordance with JIS K 7125. In order to arrange the polyurethane foam in the gap with ease of sliding, the dynamic friction coefficient is, for example, preferably 5 or less, more preferably 3 or less, further preferably 2 or less, and particularly preferably 1.5 or less.

[0084] The air permeability was measured based on JIS K6400-7:2012A method using a sample (with a surface layer) of 51×51×10 mm cut into 10 mm from the surface of the polyurethane foam.

[0085] The sound transmission loss was measured at a frequency of 1000 to 6300 Hz in a 1 / 3 octave band in accordance with JIS A1441-1:2007, and the average sound transmission loss (average sound transmission loss) at a frequency of 1000 to 6300 Hz was determined.

[0086] Regarding the measurement of sound transmission loss, the sound source reverberation room is 36m 3 , the sound receiving anechoic chamber is 20m 3 , the measuring area is 400×400mm(0.16m 2 ). The gap is further sealed with clay while the surrounding of the sound insulation material composed of 500 mm square × 30 mm or 40 mm (surface layer with surface) polyurethane foam is fixed with a 50 mm wide frame. Sound is incident from the reverberation chamber as the sound source side, and the values ​​at 1000 Hz to 6300 Hz are measured at 25 positions (80 mm spacing) 215 mm from the surface of the sound insulation material in the sound receiving anechoic chamber as the non-sound source side, and the average value is calculated.

[0087] Regarding the sound insulation evaluation, when the average value of the sound transmission loss from 1000 to 6300 Hz is 33 dB or more, it is recorded as "excellent", when the average value of the sound transmission loss from 1000 to 6300 Hz is less than 33 dB and is 30 dB or more, it is recorded as "good", when the average value of the sound transmission loss from 1000 to 6300 Hz is 25 dB or more and less than 30 dB, it is recorded as "qualified", and when the average value of the sound transmission loss from 1000 to 6300 Hz is less than 25 dB, it is recorded as "unqualified".

[0088] The surface hardness was measured using an Asker C hardness tester.

[0089] Comparative Example 1, Comparative Example 2

[0090] Comparative Examples 1 and 2 are examples in which the polyol is composed of a petroleum-derived polyol A and a polymer polyol and does not contain a plant-derived polyol, and the sample thicknesses are different.

[0091] The formability of Comparative Example 1 was "good", the plant content was 0%, and the density was 130 kg / m 3 The sample thickness is 40mm, the air permeability is 4L / min, the average sound transmission loss from 1000 to 6300Hz is 31.5dB, the sound insulation evaluation is "good", and the Asker C hardness is 2.

[0092] The formability of Comparative Example 2 was "good", the plant content was 0%, and the density was 130 kg / m 3 The sample thickness is 30mm, the air permeability is 4L / min, the average sound transmission loss from 1000 to 6300Hz is 28.8dB, the sound insulation evaluation is "qualified", and the Asker C hardness is 2.

[0093] Comparative Example 3 is an example in which the polyol is composed of 90 parts by weight of the plant-derived polyol B and 10 parts by weight of the polymer polyol.

[0094] The formability of Comparative Example 3 was "unacceptable", the plant content was 51%, and the density was 130 kg / m 3 , the sample thickness is 40mm.

[0095] Since the moldability of Comparative Example 3 was poor and a good polyurethane foam could not be obtained, the dynamic friction coefficient, air permeability, sound transmission loss, and Asker C hardness could not be measured.

[0096] Comparative Example 4 is an example in which the polyol is composed of 33.5 parts by weight of petroleum-derived polyol A, 56.5 parts by weight of plant-derived polyol B, and 10 parts by weight of polymer polyol.

[0097] The formability of Comparative Example 4 was "acceptable", the plant content was 35%, and the density was 130 kg / m 3 , the sample thickness was 30 mm, the formability was poor, and no evaluation was performed.

[0098] Example 1, Example 2

[0099] Both Example 1 and Example 2 are examples in which the polyol is composed of 56.5 parts by weight of plant-derived polyol B and 43.5 parts by weight of polymer polyol, and the densities are different.

[0100] The formability of Example 1 is "good", the plant content is 35%, and the density is 130kg / m 3 The sample thickness is 30mm, the air permeability is 1.5L / min, the average sound transmission loss from 1000 to 6300Hz is 33.5dB, the sound insulation evaluation is "excellent", and the Asker C hardness is 2.

[0101] Compared with Comparative Example 2, which has the same thickness and density as the sample of Example 1 and also has good moldability, Example 1 has good sound insulation.

[0102] The formability of Example 2 is "good", the plant content is 35%, and the density is 120kg / m 3The sample thickness is 30mm, the air permeability is 2L / min, the average sound transmission loss from 1000 to 6300Hz is 32.9dB, the sound insulation evaluation is "good", and the Asker C hardness is 1.

[0103] Although Example 2 has a lower density and lighter weight than Comparative Example 2, its sound insulation is better than that of Comparative Example 2.

[0104] Example 3

[0105] Example 3 is an example in which the polyol is composed of 46.5 parts by weight of plant-derived polyol B, 10 parts by weight of plant-derived polyol C, and 43.5 parts by weight of polymer polyol.

[0106] The formability of Example 3 was "acceptable", the plant content was 35%, and the density was 120 kg / m 3 , the sample thickness was 30 mm, the formability was poor, and no evaluation was performed.

[0107] As described above, according to the present disclosure, it is possible to obtain a polyurethane foam which has good sound insulation even when the weight is reduced and which contributes to reducing environmental load.

[0108] In addition, the polyurethane foam disclosed in the present invention is not only suitable for being arranged on a wall or space requiring sound insulation, but is also suitable for being compressed and slidably arranged in a gap in a sound transmission path, and after arrangement, it satisfies the sound insulation purpose of the gap through elastic recovery. It is particularly suitable as a sound insulation material for vehicles that requires lightness and sound insulation.

[0109] It should be noted that the present invention is not limited to the embodiments, and changes can be made within the scope of the invention.

[0110] All documents cited in this specification, including publications, patent applications and granted patents, are individually and specifically incorporated into this specification by reference, and their entire contents are incorporated into this specification by reference to the same extent as described in this specification.

[0111] The use of nouns and similar indicators used in the description of the present invention (especially with respect to the following claims) is interpreted as covering both the singular and the plural, unless otherwise specified in this specification or clearly contradicted by the context. Unless otherwise indicated, the words "have", "have", "include" and "include" are interpreted as open terms (i.e., meaning "including but not limited to"). Unless otherwise specified in this specification, the specific content of the numerical range in this specification is intended only to be used as a shorthand method for individually referring to each value falling within the range, and each value is incorporated into this specification as shown in a separate listing in this specification. All methods described in this specification can be performed in any suitable order, unless otherwise specified in this specification or clearly contradicted by the context. Unless otherwise required, any examples or exemplary words (e.g., "etc.") used in this specification are only intended to better describe the present invention without imposing limitations on the scope of the present invention. Any wording in the specification should not be interpreted as indicating an element that is not mentioned in the claims but is essential to the implementation of the present invention.

[0112] The preferred embodiments of the present invention are described in this specification, including the best mode known to the inventor for implementing the present invention. For those skilled in the art, the deformation of these preferred embodiments will be obvious based on reading the above description. The inventors expect that those skilled in the art will appropriately apply such deformations and intend to implement the present invention in a manner other than that specifically described in this specification. Therefore, the present invention includes all changes and equivalents of the contents recorded in the claims attached to this specification as allowed by applicable law. In addition, unless otherwise indicated in this specification or obviously contradictory to the context, any combination of the above elements in all deformations is included in the present invention.

Claims

1. A polyurethane foam, wherein: The polyurethane foam is obtained from a polyurethane foam composition comprising a polyol component, a polyisocyanate, a blowing agent and a catalyst. In the polyurethane foam, The polyol component includes plant-derived polyol and polymer polyol. The plant content expressed as % by weight of the plant-derived polyol contained in the polyurethane foam composition is 15% or more, The air permeability (JIS K6400-7:2012A method) is 10 L / min or less.

2. The polyurethane foam according to claim 1, wherein The total amount of the plant-derived polyol and the polymer polyol in the polyol component is 86% by weight or more.

3. The polyurethane foam according to claim 1 or 2, wherein The average sound transmission loss (JIS A1441-1:2007) at a frequency of 1000 to 6300 Hz is 30 dB or more.

4. The polyurethane foam according to claim 1 or 2, wherein Density 100~160kg / m 3 .

5. The polyurethane foam according to claim 1 or 2, wherein The surface hardness is Asker C hardness 30 or less.

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