Polyurethane foam, articles

Abstract

The object of the present invention is to provide a polyurethane foam that has sound-absorbing properties, is lightweight, has good quality, and is suitable for use in furniture, building materials, vehicle interior materials, etc. [Solution] In a polyurethane foam obtained from polyurethane foam raw materials containing polyol, isocyanate, blowing agent, and catalyst, the polyurethane foam raw materials contain sodium bicarbonate and an organic solid acid, the blowing agent water is 10 parts by weight or more per 100 parts by weight of polyol, the isocyanate index is 100 or more, and the catalyst contains a metal catalyst in an amount of 0.4 to 0.8 parts by weight per 100 parts by weight of the polyol, resulting in a polyurethane foam that is sound-absorbing, lightweight, and of good quality.

Description

[Technical Field]

[0001] This invention relates to a lightweight polyurethane foam with sound-absorbing properties and a method for producing the same. [Background technology]

[0002] Polyurethane foam, obtained from polyurethane foam raw materials containing polyols, isocyanates, blowing agents, and catalysts, is widely used in furniture, building materials, and vehicle interior materials.

[0003] A lightweight polyurethane foam with sound-absorbing properties is known in which a large amount of water (7 to 17 parts by weight per 100 parts by weight of polyol) is used as a blowing agent. (Patent Document 1, Claim 7).

[0004] However, polyurethane foam that contains a large amount of water as a foaming agent generates a high temperature during foaming, which can lead to scorching (burning or charring) of the polyurethane foam, resulting in a decrease in quality. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent No. 5204754 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] The present invention has been made in view of the above points, and aims to provide a lightweight polyurethane foam with sound-absorbing properties and good quality, as well as a method for manufacturing the same. [Means for solving the problem]

[0007] The invention of claim 1 is a polyurethane foam obtained from a polyurethane foam raw material comprising a polyol, an isocyanate, a blowing agent, and a catalyst, wherein the polyurethane foam raw material comprises sodium bicarbonate and an organic solid acid, the blowing agent, which is water, is 10 parts by weight or more per 100 parts by weight of the polyol, the isocyanate index is 100 or more, and the catalyst comprises a metal catalyst in an amount of 0.4 to 0.8 parts by weight per 100 parts by weight of the polyol.

[0008] The invention of claim 2 is characterized in that, in claim 1, the sodium bicarbonate is 5 to 50 parts by weight per 100 parts by weight of the polyol.

[0009] The invention of claim 3 is characterized in that, in claim 1 or 2, the amount of the organic solid acid is 1 / 30 to 1 / 60 of the amount of the sodium bicarbonate.

[0010] The invention of claim 4 is characterized in that, in any one of claims 1 to 3, the organic solid acid is citric acid and / or malic acid.

[0011] The invention of claim 5 is a method for producing polyurethane foam by mixing and reacting polyurethane foam raw materials comprising a polyol, an isocyanate, a blowing agent, and a catalyst, characterized in that the polyurethane foam raw materials contain sodium bicarbonate and an organic solid acid, the blowing agent is water in an amount of 10 parts by weight or more per 100 parts by weight of the polyol, the isocyanate index is 100 or more, and the catalyst contains a metal catalyst in an amount of 0.4 to 0.8 parts by weight per 100 parts by weight of the polyol. [Effects of the Invention]

[0012] In the present invention, since water is used in an amount of 10 parts by weight or more with respect to 100 parts by weight of the polyol as a blowing agent, there is a concern that the reaction heat generation temperature may become high during the production of the polyurethane foam. However, sodium hydrogen carbonate and organic solid acid contained in the polyurethane foam raw material are decomposed by the heat generation during the production of the polyurethane foam to generate water, and the temperature rise is suppressed by the latent heat of vaporization (heat of vaporization) of the water. Therefore, the inside of the polyurethane foam is not exposed to high temperatures, it is difficult to cause scorch, and a lightweight and high-quality polyurethane foam with little discoloration can be obtained.

[0013] When the organic solid acid is citric acid, the first-stage endothermic reaction is as shown in FIG. 1. By the reaction of sodium hydrogen carbonate and citric acid, trisodium citrate, water, and carbon dioxide are generated, and the temperature rise due to the reaction of the polyurethane foam raw material is suppressed by the endotherm at that time.

[0014] In addition, the sodium hydrogen carbonate that was not consumed in the first-stage endothermic reaction undergoes the second-stage endothermic reaction shown in FIG. 1 due to the heat generation caused by the subsequent reaction progress of the polyurethane foam raw material, and the temperature rise due to the reaction of the polyurethane foam raw material can be further suppressed. In the second-stage endothermic reaction, the sodium hydrogen carbonate that was not consumed in the first-stage endothermic reaction thermally decomposes into sodium carbonate, water, and carbon dioxide.

[0015] The first-stage endothermic reaction and the second-stage endothermic reaction in the case where the organic solid acid is malic acid are as shown in FIG. 2. In addition, water and carbon dioxide are generated as reaction decomposition products of sodium hydrogen carbonate and organic solid acid (for example, citric acid or malic acid), the generated water evaporates, and the carbon dioxide is also naturally released from the polyurethane foam, so the polyurethane foam can be made lighter.

[0016] In addition, since 0.4 to 0.8 parts by weight of a metal catalyst is contained with respect to 100 parts by weight of the polyol as a catalyst, the polyurethane foam has low air permeability and the sound absorption property can be improved.

Brief Description of the Drawings

[0017] [Figure 1] It is a diagram showing an endothermic reaction by sodium hydrogen carbonate and citric acid. [Figure 2] It is a diagram showing an endothermic reaction by sodium hydrogen carbonate and malic acid. [Figure 3] It is a table showing the formulations and physical property measurement results of Examples and Comparative Examples.

Mode for Carrying Out the Invention

[0018] The polyurethane foam of the present invention is produced by mixing and reacting a polyurethane foam raw material containing a polyol, an isocyanate, a foaming agent, a catalyst, sodium hydrogen carbonate, and an organic solid acid.

[0019] As the polyol, a polyol for polyurethane foam can be used. For example, any of polyether polyol, polyester polyol, and polyether ester polyol may be used, and one kind or a plurality of kinds thereof may be used.

[0020] Examples of the polyether polyol include polyether polyols obtained by adding an alkylene oxide such as ethylene oxide (EO) or propylene oxide (PO) to a polyhydric alcohol such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, or sucrose.

[0021] Examples of the polyester polyol include polyester polyols obtained by polycondensation from aliphatic carboxylic acids such as malonic acid, succinic acid, and adipic acid or aromatic carboxylic acids such as phthalic acid and aliphatic glycols such as ethylene glycol, diethylene glycol, and propylene glycol. Furthermore, examples of polyether ester polyols include those obtained by reacting the aforementioned polyether polyol with a polybasic acid to produce polyester, or those having both polyether and polyester segments within a single molecule.

[0022] Regarding the polyol, it is preferable to use one or more polyols having a hydroxyl value (OHV) of 20 to 300 mgKOH / g, 2 to 6 functional groups, and a weight-average molecular weight of 500 to 15,000.

[0023] As the isocyanate, aliphatic or aromatic polyisocyanates having two or more isocyanate groups, mixtures thereof, and modified polyisocyanates obtained by modifying them can be used. Examples of aliphatic polyisocyanates include hexamethylene diisocyanate, isophorone diisocyanate, and dicyclohexamethane diisocyanate, while examples of aromatic polyisocyanates include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate, xylylene diisocyanate, and polymeric MDI (crude MDI). Other prepolymers can also be used.

[0024] The isocyanate index (INDEX) is preferably 100 or higher, and more preferably 100 to 125. The isocyanate index is calculated by dividing the number of moles of isocyanate groups in the isocyanate by the total number of moles of active hydrogen groups such as hydroxyl groups in the polyol, and multiplying the result by 100. It is calculated as [NCO equivalent of isocyanate ÷ active hydrogen equivalent × 100].

[0025] Water is preferred as the blowing agent. Water generates carbon dioxide gas during the reaction between the polyol and the isocyanate, and this carbon dioxide gas causes foaming. The amount of water used as the blowing agent is 10 parts by weight or more per 100 parts by weight of polyol, and the preferred amount of water is 10 to 15 parts by weight.

[0026] The catalyst may include a metal catalyst, preferably used in combination with an amine catalyst. Examples of metal catalysts include tin catalysts such as stanus octoate and dibutyltin dilaurate, phenylmercury propionate, or lead octenoate. The amount of metal catalyst is 0.4 to 0.8 parts by weight, preferably 0.4 to 0.6 parts by weight, per 100 parts by weight of polyol. Including the metal catalyst in the above range reduces the permeability of the polyurethane foam and increases the average sound absorption coefficient across the entire frequency range from low to high frequencies, specifically the average sound absorption coefficient from 1000 to 12500 Hz. Examples of amine catalysts include triethylamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, N-ethylmorpholine, and tetramethylguanidine. The amount of amine catalyst is preferably 0 or 0.05 to 0.7 parts by weight per 100 parts by weight of polyol.

[0027] The amount of sodium bicarbonate is preferably 5 to 50 parts by weight per 100 parts by weight of polyol. By setting the amount of sodium bicarbonate within this range, the endothermic reaction can be carried out smoothly, and the rise in exothermic temperature during the manufacture of polyurethane foam can be suppressed.

[0028] When organic solid acids are used in combination with sodium bicarbonate, the endothermic effect during the manufacturing of polyurethane foam is greatly increased, and the rise in the exothermic temperature of the polyurethane foam can be more effectively suppressed. The amount of organic solid acid is preferably 1 / 30 to 1 / 60 of the amount of sodium bicarbonate, and more preferably 1 / 30 to 1 / 50.

[0029] Examples of organic solid acids include citric acid, fumaric acid, malonic acid, stearic acid, pyruvic acid, phthalic acid, malic acid, maleic acid, succinic acid, and polybasic carboxylic acids having a hydroxyl group. The organic solid acid is not limited to one type; two or more types may be used in combination. In particular, citric acid and malic acid (hydroxy acid) are preferred organic solid acids in this invention, and either one or both may be used. Malic acid, in particular, is a preferred organic solid acid in this invention. Both hydrated and anhydrous forms of citric acid can be used.

[0030] Other additives may be added to the polyurethane foam raw materials. Examples of additives include foam stabilizers and colorants. As foam stabilizers, those known for use in polyurethane foam can be used. Examples include silicone-based foam stabilizers, fluorine-based foam stabilizers, and known surfactants. As colorants, carbon pigments and other colorants suitable for the application of the polyurethane foam can be used.

[0031] The polyurethane foam of the present invention has a density (JIS K7220) of 10-15 kg / m³. 3 It is preferable that the density is low within the aforementioned range. By making the polyurethane foam lightweight, the average sound absorption coefficient in the 2500-12500Hz range can be increased. Furthermore, the polyurethane foam of the present invention has an air permeability (JIS K6400-7:2012) of 0.1 to 10 cc / cm³. 2 It is preferable that the concentration is / s, and more preferably 0.2 to 5 cc / cm³. 2 The value is / s. By creating a low air permeability within the aforementioned range, the average sound absorption coefficient of the polyurethane foam across the entire frequency range from low to high frequencies, specifically the average sound absorption coefficient from 1000 to 12500 Hz, can be increased.

[0032] Polyurethane foam can be manufactured using either the mold foaming method, where the foam is poured into a mold, or the slab stock foaming method. Of these, the slab stock foaming method is preferable for mass production. The slab stock foaming method involves mixing two polyurethane foam raw materials in a stirrer, extruding the mixture onto a belt conveyor, and foaming it at atmospheric pressure and room temperature. The polyurethane raw material composition can be prepared using methods such as the one-shot method or the prepolymer method. [Examples]

[0033] The following components were mixed in the proportions shown in Figure 3, and the mixture was reacted and foamed to produce polyurethane foams for each comparative example and each example. The amount of each component added is in parts by weight. • Polyol; polyether polyol, molecular weight: 3000, number of functional groups: 3, hydroxyl value: 56.1 mgKOH / mg, catalog number: GP-3050, manufactured by Sanyo Chemical Industries, Ltd. • Foaming agent - 1; Water • Foaming agent - 2; liquefied carbon dioxide (CO2) • Amine catalyst; N-ethylmorpholine, catalog number: NEM, manufactured by Huntsman. • Metal catalyst; stannous octylate, product code: MRH110, manufactured by Johoku Chemical Industry Co., Ltd. • Foam stabilizer; silicone-based foam stabilizer, part number: B8110, manufactured by Evonik. Sodium bicarbonate • Malic acid • Isocyanate; 2,4-TDI / 2,6-TDI = 80 / 20, Part Number: Coronate T-80, Manufactured by Nippon Polyurethane Industries Co., Ltd.

[0034] For each comparative example and each example, the heat generation temperature (maximum heat generation temperature), density (JIS K7220), hardness (JIS K6400-2), air permeability (JIS K6400-7:2012), and normal incidence sound absorption coefficient (JIS A1405-2:2007) were measured.

[0035] The method for measuring the exothermic temperature was as follows: A wooden box measuring 100cm x 100cm x 60cm without a lid was prepared in advance, and a thermocouple was set in the center of this box. Then, the two liquids of the polyol-containing component and the isocyanate component for each comparative example and each example were prepared separately. After mixing and stirring the two liquids in a propeller mixer, the reaction mixture was poured into the wooden box, and the polyurethane foam was allowed to naturally foam at room temperature and atmospheric pressure, and the exothermic temperature was measured with the thermocouple. The measurement results of the exothermic temperature were evaluated, with "◎" indicating an exothermic temperature of less than 150℃, "〇" indicating an exothermic temperature of 150℃ or more and less than 160℃, and "×" indicating an exothermic temperature of 160℃ or more.

[0036] The density measurement results were evaluated, and the density was 12 kg / m³. 3 If less than 12kg / m², mark with "◎". 3 More than 15kg / m 3 If less than 15 kg / m², write "〇". 3 In the above cases, we marked it with "×".

[0037] The measurement of the normal incidence sound absorption rate was carried out with the thickness of the measurement sample being 10 mm in the range of the center frequencies of 1 / 3 octave bands from 1000 to 12500 Hz. Also, the average values were obtained for each range of 1000 - 12500 Hz, 2000 - 12500 Hz, and 2500 - 12500 Hz, and the sound absorption performance was evaluated. The evaluation of the sound absorption performance was marked as "〇" when the average values in each range of the measured values of the normal incidence sound absorption rate were all 0.6 or more, and marked as "×" when there was even one range with a value less than 0.6.

[0038] In addition, a comprehensive evaluation was carried out based on the evaluation of the heat generation temperature, density, and sound absorption performance. When all evaluations were "〇" or above, the comprehensive evaluation was "〇", and when there was even one "×", the comprehensive evaluation was "×". The results of each measurement, each evaluation, and the comprehensive evaluation are shown in Figure 3.

[0039] Comparative Example 1 is an example where there are 100 parts by weight of polyol, 5 parts by weight of blowing agent - 1 (water), 4 parts by weight of blowing agent - 2 (CO2), 0.2 parts by weight of amine catalyst, 0.3 parts by weight of metal catalyst, 1 part by weight of foam stabilizer, 60 parts by weight of isocyanate, and an isocyanate index of 105, and neither sodium hydrogen carbonate nor malic acid is added.

[0040] Comparative Example 1 had a heat generation temperature of 154 °C, a heat generation temperature evaluation of "〇", a density of 14.2 kg / m 3 , a density evaluation of "〇", a hardness of 60 N, a ventilation of 23 cc / cm 2 / s, an average normal incidence sound absorption rate of 0.49 in the range of 1000 - 12500 Hz, an average of 0.63 in the range of 2000 - 12500 Hz, an average of 0.69 in the range of 2500 - 12500 Hz, a sound absorption performance evaluation of "×", and a comprehensive evaluation of "×". In Comparative Example 1, because the amount of blowing agent - 1 (water) was less than 10 parts by weight and the amount of metal catalyst was less than 0.4 parts by weight, the air permeability was high, and the numerical value in the range of 1000 - 12500 Hz of the normal incidence sound absorption rate was low, resulting in poor sound absorption performance.

[0041] Comparative Example 2 is an example where there are 5.6 parts by weight of blowing agent - 1 (water), 0 parts by weight of blowing agent - 2 (CO2), 66.1 parts by weight of isocyanate, and the others are the same as in Comparative Example 1.

[0042] Comparative Example 2 has an exothermic temperature of 159°C, an exothermic temperature evaluation of "〇", and a density of 21.0 kg / m³. 3 Density evaluation: "×", hardness: 98N, air permeability: 90cc / cm² 2 The sound absorption coefficients were 0.41 on average from 1000 to 12500 Hz, 0.51 on average from 2000 to 12500 Hz, and 0.56 on average from 2500 to 12500 Hz. The sound absorption evaluation was "×" and the overall evaluation was "×". Compared to Comparative Example 1, Comparative Example 2 did not contain foaming agent-2 (CO2), resulting in higher density, hardness, and permeability. The sound absorption coefficients were less than 0.6 in all ranges of the normal incidence, indicating poor sound absorption.

[0043] Comparative Example 3 is an example in which the metal catalyst is 0.45 parts by weight, and the other components are the same as in Comparative Example 2.

[0044] Comparative Example 3 has an exothermic temperature of 162°C, an exothermic temperature evaluation of "×", and a density of 20.5 kg / m³. 3 Density evaluation "×", hardness 90N, air permeability 18cc / cm 2 The sound absorption coefficients were 0.64 on average at 1000-12500Hz, 0.80 on average at 2000-12500Hz, and 0.85 on average at 2500-12500Hz, resulting in a sound absorption evaluation of "〇" and an overall evaluation of "×". In Comparative Example 3, the amount of metal catalyst was increased compared to Comparative Example 2, which resulted in a higher heat generation temperature, but also lower permeability, leading to a sound absorption coefficient of 0.6 or higher in all ranges of the normal incidence, indicating improved sound absorption.

[0045] Comparative Example 4 is an example in which 10 parts by weight of sodium bicarbonate is included, and the other parameters are the same as in Comparative Example 2.

[0046] Comparative Example 4 has an exothermic temperature of 149°C, an exothermic temperature rating of "◎", and a density of 19.9 kg / m³. 3 Density evaluation: "×", hardness: 85N, air permeability: 21cc / cm² 2The sound absorption coefficient for normal incidence was 0.53 on average at 1000-12500Hz, 0.66 on average at 2000-12500Hz, and 0.71 on average at 2500-12500Hz. The sound absorption evaluation was "×" and the overall evaluation was "×". Compared to Comparative Example 2, Comparative Example 4 is heavier with a similar density because the amount of foaming agent-1 (water) is less than 10 parts by weight. The inclusion of sodium bicarbonate lowers the exothermic temperature but increases permeability, resulting in lower values ​​in the normal incidence sound absorption coefficient in the 1000-12500Hz range and inferior sound absorption.

[0047] Example 1 consists of 100 parts by weight of polyol, 10 parts by weight of blowing agent-1 (water), 0.2 parts by weight of amine catalyst, 0.4 parts by weight of metal catalyst, 1 part by weight of foam stabilizer, 10 parts by weight of sodium bicarbonate, 0.7 parts by weight of malic acid, 131.2 parts by weight of isocyanate, and an isocyanate index of 105. Compared to Comparative Examples 2 and 4, Example 1 is an example in which the amount of blowing agent-1 (water) is increased to 10 parts by weight, the amount of metal catalyst is increased to 0.4 parts by weight, and the amount of isocyanate is adjusted so that it contains both sodium bicarbonate and malic acid, and the isocyanate index is 105, the same as in Comparative Examples 2 and 4.

[0048] Example 1 had an exothermic temperature of 158°C, an exothermic temperature evaluation of "○", and a density of 12.8 kg / m³. 3 Density evaluation: "○", hardness: 85N, air permeability: 1.8cc / cm² 2 The sound absorption coefficient was 0.66 on average at 1000-12500Hz, 0.82 on average at 2000-12500Hz, and 0.88 on average at 2500-12500Hz. The sound absorption performance was rated "〇", and the overall rating was "〇".

[0049] In Example 1, compared to Comparative Examples 2 and 4, increasing the amount of blowing agent-1 (water) to 10 parts by weight and the amount of metal catalyst to 0.4 parts by weight would normally result in a higher exothermic temperature. However, by including both sodium bicarbonate and malic acid, the exothermic temperature was lowered. Furthermore, in Example 1, increasing the amount of blowing agent-1 (water) to 10 parts by weight and the amount of metal catalyst to 0.4 parts by weight resulted in a lower density and reduced permeability, leading to a normal incidence sound absorption coefficient of 0.6 or higher in all ranges, thus improving sound absorption.

[0050] Example 2 is an example in which the amount of foaming agent-1 (water) is increased to 12 parts by weight, sodium bicarbonate to 30 parts by weight, and malic acid to 0.8 parts by weight, while the other components are the same as in Example 1. Example 2 has an exothermic temperature of 141°C, an exothermic temperature evaluation of "◎", and a density of 10.9 kg / m³. 3 Density rating: "◎", Hardness: 74N, Air permeability: 1.5cc / cm² 2 The sound absorption coefficient was 0.67 on average at 1000-12500Hz, 0.83 on average at 2000-12500Hz, and 0.89 on average at 2500-12500Hz. The sound absorption performance was rated "〇", and the overall rating was "〇".

[0051] In Example 2, compared to Example 1, the amount of foaming agent-1 (water) was increased to 12 parts by weight. While this would normally result in a higher exothermic temperature, increasing both the amount of sodium bicarbonate and the amount of malic acid resulted in a lower exothermic temperature. Furthermore, by increasing the amount of foaming agent-1 (water) in Example 2, the density became lower than in Example 1, as did the air permeability, resulting in higher values ​​in all ranges of the normal incidence sound absorption coefficient, thus further improving sound absorption.

[0052] Example 3 is an example in which the amount of metal catalyst is increased to 0.5 parts by weight, and the other parameters are the same as in Example 2.

[0053] Example 3 has an exothermic temperature of 145°C, an exothermic temperature rating of "◎", and a density of 10.5 kg / m³. 3 Density rating: "◎", hardness: 78N, air permeability: 0.2cc / cm² 2The sound absorption coefficient was 0.69 on average at 1000-12500Hz, 0.86 on average at 2000-12500Hz, and 0.91 on average at 2500-12500Hz. The sound absorption performance was rated "〇", and the overall rating was "〇".

[0054] Compared to Example 2, Example 3 increased the amount of metal catalyst to 0.5 parts by weight, which reduced the air permeability and resulted in higher sound absorption in all ranges of the normal incidence sound absorption coefficient compared to Example 2, thus further improving sound absorption.

[0055] Example 4 is an example in which the amount of sodium bicarbonate is increased to 35 parts by weight, and the other parameters are the same as in Example 2.

[0056] Example 4 has an exothermic temperature of 137°C, an exothermic temperature rating of "◎", and a density of 10.4 kg / m³. 3 Density evaluation: "◎", Hardness: 76N, Air permeability: 1.0cc / cm² 2 The sound absorption coefficient was 0.66 on average at 1000-12500Hz, 0.83 on average at 2000-12500Hz, and 0.89 on average at 2500-12500Hz. The sound absorption performance was rated "〇", and the overall rating was "〇".

[0057] In Example 4, the amount of sodium bicarbonate was increased by 5 parts by weight compared to Example 2, resulting in a slight decrease in the exothermic temperature. Regarding the normal incidence sound absorption coefficient, results equivalent to those of Example 2 were obtained in all ranges, indicating good sound absorption.

[0058] Example 5 is an example in which the amount of sodium bicarbonate is increased to 45 parts by weight, and the other parameters are the same as in Examples 2 and 4.

[0059] Example 5 has an exothermic temperature of 129°C, an exothermic temperature rating of "◎", and a density of 10.9 kg / m³. 3 Density evaluation: "◎", Hardness: 71N, Air permeability: 1.3cc / cm² 2 The sound absorption coefficient was 0.67 on average at 1000-12500Hz, 0.84 on average at 2000-12500Hz, and 0.90 on average at 2500-12500Hz. The sound absorption performance was rated "〇", and the overall rating was "〇".

[0060] In Example 5, the amount of sodium bicarbonate was increased compared to Examples 2 and 4, resulting in a further reduction in the exothermic temperature. Regarding the normal incidence sound absorption coefficient, results equivalent to Examples 2 and 4 were obtained in all ranges, indicating good sound absorption.

[0061] Thus, the polyurethane foam of the present invention has good sound absorption properties, is lightweight, and of good quality, making it suitable for furniture, building materials, vehicle interior materials, sound-absorbing materials, and the like.

Claims

1. Density (JIS K7222) is 10 kg / m³ ３ 15kg / m or more ３ The following: Air permeability (JIS K6400-7:2012) is 0.1 cc / cm³ ２ / sec or more 10cc・cm ２ / sec or less, The average value of the normal incidence sound absorption coefficient (JIS A1405-2:2007) in the center frequency ranges of 1000-12500 Hz, 2000-12500 Hz, and 2500-12500 Hz for each of the 1 / 3 octave bands is 0.6 or higher in all cases. The average value of the normal incidence sound absorption coefficient in the center frequency range of 1000 to 12500 Hz of the 1 / 3 octave band is 0.69 or less. The average value of the normal incidence sound absorption coefficient in the 1 / 3 octave band with a center frequency of 2000 to 12500 Hz is 0.86 or less. The average value of the normal incidence sound absorption coefficient in the center frequency range of 2500 to 12500 Hz of the 1 / 3 octave band is 0.91 or less. Polyurethane foam manufactured using polyurethane foam raw materials containing sodium bicarbonate and organic solid acids.

2. An article comprising the polyurethane foam described in claim 1, The aforementioned article is selected from furniture, building materials, vehicle interior materials, and sound-absorbing materials.

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