Polyurethane foam and its manufacturing method

Abstract

The object of the present invention is to provide a molded polyurethane foam which has high thermal conductivity and, when used as an interior material for a vehicle, can improve the efficiency of heating and cooling inside the vehicle, thereby contributing to energy conservation. [Solution] A polyurethane foam is obtained by foaming a polyurethane foam composition containing a polyol, a blowing agent, a catalyst, a foam stabilizer, and an isocyanate in a mold. The polyol contains a low EO polyether polyol with an ethylene oxide addition rate of 1 to 25% by weight and a polymer polyol, and the foam stabilizer is a silicone-based foam stabilizer with a viscosity of 1000 mPa·s (25°C) or more and a surface tension of 26 mN / m or less.

Description

[Technical field]

[0001] The present invention relates to a polyurethane foam and a method for producing the same. [Background technology]

[0002] Conventionally, polyurethane foams have generally been used as heat insulating materials in the form of foams that make it difficult for heat to be transmitted, and molded polyurethane foams have been used in vehicle interior materials such as seat cushions, head rests, and arm rests. The molded polyurethane foam is produced from a polyurethane foam composition by a mold foaming method.

[0003] The mold foaming method is a method for producing polyurethane foam by injecting a polyurethane foam composition containing a polyol, a blowing agent, a catalyst, and an isocyanate into a mold and foaming through a reaction between the polyol and the isocyanate. The mold foaming method has the advantage of being able to reduce post-processing, since polyurethane foam in the product shape is obtained by foaming.

[0004] In automobiles, the temperature inside the vehicle cabin is controlled by the operation of an air conditioner, but there is a demand for improving the efficiency of heating and cooling inside the vehicle cabin in order to save energy.

[0005] However, molded polyurethane foam used in vehicle interior materials has a low thermal conductivity, which means heat tends to build up, and a lot of energy is required to keep the interior of the vehicle at an appropriate temperature. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 6-22918 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned points, and has an object to provide a molded polyurethane foam which has high thermal conductivity and can improve the efficiency of heating and cooling inside a vehicle cabin when used as an interior material for a vehicle, thereby contributing to energy saving, and a method for producing the same. [Means for solving the problem]

[0008] The first aspect is a molded polyurethane foam obtained from a polyurethane foam composition containing a polyol, a blowing agent, a catalyst, a foam stabilizer, and an isocyanate, characterized in that the polyol contains a low EO polyether polyol having an ethylene oxide addition rate of 1 to 25 weight % and a polymer polyol, and the foam stabilizer is a silicone-based foam stabilizer having a viscosity of 1000 mPa s (25°C) or more and a surface tension of 26 mN / m (25°C) or less.

[0009] The second aspect is characterized in that, in the first aspect, the low EO polyether polyol is 30 to 80 parts by weight when the total polyol amount is 100 parts by weight, and the silicone-based foam stabilizer is a linear silicone.

[0010] A third aspect is characterized in that in the first or second aspect, the isocyanate is an MDI-based isocyanate alone or a combination of an MDI-based isocyanate and TDI.

[0011] A fourth aspect is any one of the first to third aspects, characterized in that the catalyst includes two types of catalyst, a foaming catalyst and a resinification catalyst.

[0012] The fifth aspect is characterized in that, in any one of the first to fourth aspects, the polyol contains, together with the low EO polyether polyol and the polymer polyol, a high EO polyether polyol having an ethylene oxide addition rate of 70 to 100% by weight.

[0013] A sixth aspect is any one of the first to fifth aspects, characterized in that the composition for polyurethane foam contains a crosslinking agent.

[0014] A seventh aspect is any one of the first to sixth aspects, wherein the molded polyurethane foam has a density of 30 to 70 kg / m 3 It is characterized by having 4 to 30 cells per 25 mm and a thermal conductivity of 0.039 to 0.050 W / m K.

[0015] The eighth aspect is a method for producing molded polyurethane foam, which comprises injecting a polyurethane foam composition containing a polyol, a blowing agent, a catalyst, a foam stabilizer, and an isocyanate into a mold and foaming the polyurethane foam, characterized in that the polyol contains a low EO polyether polyol having an ethylene oxide addition rate of 1 to 25% by weight and a polymer polyol, and the foam stabilizer is a silicone-based foam stabilizer having a viscosity of 1000 mPa s (25°C) or more and a surface tension of 26 mN / m (25°C) or less.

[0016] The ninth aspect is characterized in that, in the eighth aspect, the low EO polyether polyol is 30 to 80 parts by weight when the total polyol amount is 100 parts by weight, and the silicone-based foam stabilizer is a linear silicone. Effect of the Invention

[0017] According to the present invention, a molded polyurethane foam having high thermal conductivity can be obtained. When the molded polyurethane foam of the present invention is used as an interior material for a vehicle, the efficiency of heating and cooling in the vehicle cabin can be improved, thereby contributing to energy saving. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a cross-sectional view of an example of a molded polyurethane foam of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing the production of a molded polyurethane foam. [Diagram 3]1 is a table showing the formulations of polyurethane foam compositions and the results of measuring their physical properties in Examples and Comparative Examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] An embodiment of the present invention will now be described. A molded polyurethane foam 10 according to one embodiment of the present invention shown in Fig. 1 is used as a seat cushion for a vehicle, and is obtained from a polyurethane foam composition.

[0020] The polyurethane foam composition contains a polyol, a blowing agent, a catalyst, a foam stabilizer, and an isocyanate. The polyols include low EO polyether polyols and polymer polyols, and more preferably further include high EO polyether polyols.

[0021] The low EO polyether polyol has an ethylene oxide (EO) addition rate of 1 to 25% by weight, more preferably 5 to 20% by weight. The low EO polyether polyol preferably has 1 to 4 functional groups and a molecular weight (number average) of 3,000 to 8,000. The ethylene oxide (EO) addition rate (wt %) refers to the weight ratio of ethylene oxide (EO) to the total amount of alkylene oxides (AO), such as ethylene oxide (EO) and propylene oxide (PO), which are monomers used in the production of polyether polyol, and is a value calculated by EO weight × 100 / total AO amount (EO weight + PO weight, etc.).

[0022] The polymer polyol is a polyol in which polyacrylonitrile or polystyrene is dispersed. The polymer polyol preferably has an ethylene oxide (EO) addition rate of 1 to 25% by weight, a functional group number of 1 to 4, and a molecular weight (number average) of 3000 to 8000. The ethylene oxide (EO) addition rate is more preferably 5 to 20% by weight.

[0023] The high EO polyether polyol has an ethylene oxide (EO) addition rate of 70 to 100% by weight, more preferably 75 to 100% by weight. The high EO polyether polyol preferably has 1 to 4 functional groups and a molecular weight (number average) of 300 to 7000, more preferably 2 to 4 functional groups and a molecular weight (number average) of 1000 to 6000.

[0024] The low EO polyether polyol, polymer polyol and high EO polyether polyol are not limited to one type each, and a plurality of types may be used. The combined use of low EO polyether polyol and polymer polyol makes it possible to obtain a polyurethane foam with a hardness suitable for seat cushions. Furthermore, the inclusion of high EO polyether polyol makes it possible to make the individual cells constituting the polyurethane foam more open (cell openness), thereby improving the breathability of the polyurethane foam. The amount of each polyol is preferably 30 to 80 parts by weight for low EO polyether polyol, 15 to 60 parts by weight for polymer polyol, and 0 to 20 parts by weight for high EO polyether polyol, when the total of low EO polyether polyol, polymer polyol, and high EO polyether polyol is 100 parts by weight.More preferably, the amount of each polyol is preferably 40 to 75 parts by weight for low EO polyether polyol, 20 to 50 parts by weight for polymer polyol, and 0 to 15 parts by weight for high EO polyether polyol, when the total of low EO polyether polyol, polymer polyol, and high EO polyether polyol is 100 parts by weight.

[0025] The blowing agent may be water, a fluorocarbon substitute, or a hydrocarbon such as pentane, either alone or in combination, with water being particularly preferred. In the case of water, carbon dioxide gas is generated during the reaction of polyol with isocyanate, and the carbon dioxide gas is used to foam the mixture. The amount of water used as the blowing agent is preferably 1.0 to 4.0 parts by weight per 100 parts by weight of polyol.

[0026] The catalyst may be a known one for polyurethane foam. In the present invention, it is preferable to use a foaming catalyst and a resinification catalyst in combination. The foaming catalyst is a catalyst that promotes the reaction between polyisocyanate and water to generate carbon dioxide gas. The foaming catalyst is not limited, and examples thereof include amine catalysts such as triethylamine, dimethylaminoethoxyethanol, N,N,N'-trimethylaminoethyl-ethanolamine, N,N,N',N",N"-pentamethyldiethylenetriamine, and bis(2-dimethylaminoethyl)ether.

[0027] The resinification catalyst is a catalyst that promotes the urethane reaction (resinification reaction) between polyol and isocyanate. The resinification catalyst is not limited, and examples thereof include amine catalysts such as 1,2-dimethylimidazole, N·(N',N'-dimethylaminoethyl)-morpholine, tetramethylguanidine, dimethylaminoethanol, triethylenediamine, N-methyl-N'-(2-hydroxyethyl)-piperazine, N,N,N',N'-tetramethylpropane 1,3-diamine, N,N'-dimethylpiperazine, N,N,N',N'-tetramethylhexane-1,6-diamine, N,N,N',N",N"-pentamethyldipropylene-triamine, N-(2-hydroxyethyl)morpholine, ethylene glycol bis(3-dimethyl)-aminopropyl ether, N,N-dimethylcyclohexylamine, and N-methyl-N'-(2-dimethylamino)ethylpiperazine.

[0028] The combined use of a foaming catalyst and a resinification catalyst can provide a molded polyurethane foam with excellent moldability and cell-opening properties (air permeability). The total amount of the catalysts is preferably 0.3 to 3.0 parts by weight based on 100 parts by weight of the polyol.

[0029] The foam stabilizer is a silicone-based foam stabilizer for soft polyurethane foam or molded foam, which has a viscosity based on JIS K1557-5 of 1000 mPa·s (25°C) or more, preferably 1200 to 10000 mPa·s (25°C), and a surface tension based on the Wilhelmy method (25°C) of 26 mN / m or less, preferably 18 to 24 mN / m. If the foam stabilizer has a viscosity of less than 1000 mPa·s (25°C), the cells become finer and the number of cells increases, resulting in poor thermal conductivity. On the other hand, if the surface tension exceeds 26 mN / m, the foam stabilizing power becomes weak and it becomes difficult to retain foam. As the silicone-based foam stabilizer, linear silicone ((AB)n type) is preferred. Examples of usable foam stabilizers include "L-6164" and "L-629" manufactured by Momentive. "L-6164" is a linear silicone with a viscosity of 4840 mPa·s (25°C) and a surface tension of 22.7 mN / m (25°C). "L-629" is a linear silicone with a viscosity of 1560 mPa·s (25°C) and a surface tension of 20.6 mN / m (25°C). The foam stabilizer is not limited to one type, and two or more types may be used in combination. If the amount of foam stabilizer is too small, it becomes difficult to maintain the foam during foaming, and the initial compressibility when sitting down becomes hard, resulting in poor cushioning. Conversely, if the amount is too large, the cells become finer and the breathability becomes poor, tending to result in poor cushioning, so the amount is preferably 0.1 to 2.0 parts by weight, more preferably 0.4 to 1.8 parts by weight, relative to 100 parts by weight of polyol.

[0030] The isocyanate may be an aliphatic or aromatic polyisocyanate having two or more isocyanate groups, a mixture thereof, or a modified polyisocyanate obtained by modifying them. Examples of the aliphatic polyisocyanate include hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexamethane diisocyanate, etc., and examples of the aromatic polyisocyanate include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate, xylylene diisocyanate, polymeric polyisocyanate (crude MDI), etc. In addition, prepolymers modified from these may also be used.

[0031] In the present invention, it is particularly preferable to use MDI-based isocyanate alone or a combination of MDI-based isocyanate and TDI as the isocyanate. MDI-based isocyanate refers to diphenylmethane diisocyanate (MDI) alone, polymeric polyisocyanate (crude MDI) alone, a mixture of these, or a prepolymer type of these. When MDI-based isocyanate and toluene diisocyanate (TDI) are used in combination, it is preferable that the ratio of MDI-based isocyanate is 10% or more.

[0032] The isocyanate index is preferably 80 to 120, and more preferably 85 to 105. The isocyanate index is a value obtained by dividing the number of moles of isocyanate groups in an isocyanate by the total number of moles of active hydrogen groups such as hydroxyl groups in a polyol, and multiplying the result by 100, and is calculated as [NCO equivalent of isocyanate / active hydrogen equivalent×100].

[0033] Other additives that may be appropriately blended include, for example, a crosslinking agent, a flame retardant, a colorant, and the like.

[0034] The crosslinking agent is blended to adjust the hardness of the molded polyurethane foam. Examples of the crosslinking agent include polyhydric alcohols such as glycerin, 1,4-butanediol, and diethylene glycol, and amines such as ethanolamines and polyethylene polyamines. Two or more types of crosslinking agents may be used. When a crosslinking agent is blended, the amount of the crosslinking agent is preferably 0.1 to 4 parts by weight per 100 parts by weight of the polyol. The crosslinking agent is not limited to one type, and two or more types may be used.

[0035] The flame retardant is blended to reduce the combustion of the polyurethane foam. Examples of the flame retardant include known liquid flame retardants and solid flame retardants. For example, examples include halogenated polymers such as polyvinyl chloride, chloroprene rubber, and chlorinated polyethylene, organic flame retardants such as phosphate esters and halogenated phosphate ester compounds, melamine resins and urea resins, and inorganic flame retardants such as antimony oxide and aluminum hydroxide. When a flame retardant is blended, the amount of the flame retardant is preferably 0.1 to 5 parts by weight per 100 parts by weight of the polyol. The flame retardant is not limited to one type, and two or more types may be used in combination. Colorants are used to give polyurethane foam an appropriate color, and the colorant used depends on the color required. Examples of colorants include pigments and graphite.

[0036] The molded polyurethane foam 10 obtained from the polyurethane foam composition has a density (JIS K7222:2005) of 30 to 70 kg / m 3 Since it is lightweight, it is suitable for use as an interior material for vehicles.

[0037] The molded polyurethane foam 10 obtained from the polyurethane foam composition has a cell count (JIS K 6400) of 4 to 30 cells / 25 mm and a thermal conductivity at room temperature (JIS A 1412-2: heat flow meter method) of 0.039 to 0.050 W / m K. Since the molded polyurethane foam 10 has high thermal conductivity and good thermal conductivity, when used as an interior material for a vehicle, it can improve the efficiency of heating and cooling the vehicle cabin and contribute to energy saving.

[0038] A method for producing the molded polyurethane foam 10 obtained from the polyurethane foam composition will now be described. First, as shown in Fig. 2 (2-A), a polyurethane foam composition P is injected into a mold 20 using an injection nozzle N. The mold 20 is composed of a lower mold 21 and an upper mold 22, and has an inner mold surface having the same shape as the outer shape of the molded polyurethane foam to be produced.

[0039] Next, the mold 20 is closed as shown in Fig. 2 (2-B), and the polyurethane foam composition P is foamed to fill the mold 20 as shown in Fig. 2 (2-C). This foams and forms the molded polyurethane foam 10, which is then removed from the mold 20.

[0040] In the illustrated example, an example of open-mold foaming is shown in which the polyurethane foam composition P is injected with the mold 20 open and the mold 20 is closed after injection. However, closed-mold foaming may also be used in which the polyurethane foam composition is injected through a hole in the mold with the mold closed.

[0041] The packing ratio (filling rate) when the polyurethane foam composition is injected into a mold is preferably 100 to 200%, more preferably 105 to 150%, and is calculated by (density at mold foaming / density at free foaming)×100. EXAMPLES

[0042] The polyurethane foam compositions prepared according to the formulations of the Examples and Comparative Examples shown in Figure 3 using the following components were mixed and injected into a mold to produce molded polyurethane foams. The mold had an inner shape and dimensions of a rectangular parallelepiped of 20 x 20 x 8 cm, and the pack rate was 105%. The amounts of each component in Figure 3 are in parts by weight.

[0043] Polyether polyol A1: EO addition rate = 80% by weight, polyoxyalkylene polyol, molecular weight = 4000, number of functional groups = 3, OHV = 39 mg KOH / g Polyether polyol A2-1: EO addition rate = 15 wt%, polyoxyalkylene polyol, molecular weight = 5000, number of functional groups = 3, OHV = 33 mg KOH / g Polyether polyol A2-2: EO addition rate = 15 wt%, polyoxyalkylene polyol, molecular weight = 7000, number of functional groups = 3, OHV = 24 mg KOH / g Polyether polyol A3: EO addition rate = 15% by weight, polyoxyalkylene polyol, molecular weight = 5000, number of functional groups = 3, OHV = 28 mg KOH / g, polymer polyol (polymer content 20% by weight) Polyether polyol A4: EO addition rate = 0% by weight, polyoxypropylene polyol, molecular weight = 1000, functionality = 2, OHV = 112 mg KOH / g

[0044] · Crosslinker-1: Glycerin, molecular weight = 92, functional groups = 3 · Crosslinker-2: Diethanolamine, molecular weight = 105, functional groups = 2 · Crosslinker-3: Polyether-based crosslinker, molecular weight = 190, functional groups = 3

[0045] Catalyst 1: Foaming catalyst, bis(2-dimethylaminoethyl) ether, product number: BL-19, manufactured by Air Products Japan Co., Ltd. Catalyst 2: Resinification catalyst, 33% dipropylene glycol solution of triethylenediamine, product number: DABCO-33-LV, manufactured by Air Products Japan Co., Ltd.

[0046] Foam stabilizer-1: Linear silicone foam stabilizer, viscosity = 4840 mPa·s (25°C), surface tension = 22.7 mN / m (25°C), product number: L-6164, manufactured by Momentive Corporation Foam stabilizer-2: Linear silicone foam stabilizer, viscosity 1560 mPa·s (25°C), surface tension 20.6 mN / m (25°C), product number: L-629, manufactured by Momentive Foam stabilizer-3: Silicone foam stabilizer, viscosity 40mPa·s (25℃), surface tension 20.9mN / m (25℃), product number: B-8738LF, manufactured by Evonik Japan Co., Ltd. Foam stabilizer-4: Dimethylsiloxane copolymer, viscosity = 610 mPa·s (25°C), surface tension = 20.8 mN / m (25°C), product number: L-3184J, manufactured by Momentive Corporation

[0047] Isocyanate-1: 80% mixture of 2,4-toluene diisocyanate (TDI) and 2,6-toluene diisocyanate (TDI) (80:20) and 20% polymeric polyisocyanate (crude MDI), product number: TM-20, manufactured by Mitsui Chemicals, Inc. Isocyanate-2: Modified 4,4'-diphenylmethane diisocyanate, product name: Coronate 1050, manufactured by Nippon Polyurethane Industry Co., Ltd.

[0048] The density (JIS K7222:2005), cell number (JIS K 6400), thermal conductivity (JIS A 1412-2: heat flow meter method), air permeability (JIS L1096: Frazier type A method, thickness 15 mm), and resilience (JIS K 6400) were measured for the obtained Examples 1 to 5 and Comparative Examples 1 to 5. The measurement results are shown in FIG.

[0049] Example 1 is a polyether polyol comprising 5 parts by weight of polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000, and a functionality of 3, 35 parts by weight of polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000, and a functionality of 3, 40 parts by weight of polyether polyol A2-2 having an EO addition rate of 15% by weight, a molecular weight of 7000, and a functionality of 3, and a polymer polyol having an EO addition rate of 15% by weight, a molecular weight of 5000, and a functionality of 3. This is an example of production from a polyurethane foam composition consisting of 20 parts by weight of terephthalic acid A3, 1.2 parts by weight of crosslinking agent-1, 1.1 parts by weight of crosslinking agent-2, 3.6 parts by weight of water as a blowing agent, 0.05 parts by weight of catalyst-1 (foaming catalyst), 0.52 parts by weight of catalyst-2 (resinification catalyst), 1.5 parts by weight of foam stabilizer-2 (linear silicone-based foam stabilizer, viscosity 1560 mPa s (25°C), surface tension 20.6 mN / m (25°C)), and 42.9 parts by weight of isocyanate 1. Example 1 has a density of 35 kg / m 3 , Number of cells 7.5 / 25mm, Thermal conductivity 0.047W / m K, Air permeability 11cm 3 / cm 2 ·s, rebound was 38%.

[0050] Example 2 is a polyether polyol comprising 5 parts by weight of polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000, and a functionality of 3, 35 parts by weight of polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000, and a functionality of 3, 20 parts by weight of polyether polyol A2-2 having an EO addition rate of 15% by weight, a molecular weight of 7000, and a functionality of 3, and a polymer polyol having an EO addition rate of 15% by weight, a molecular weight of 5000, and a functionality of 3. This is an example of production from a polyurethane foam composition consisting of 40 parts by weight of terephthalic acid A3, 1.2 parts by weight of crosslinking agent-1, 1.1 parts by weight of crosslinking agent-2, 3.2 parts by weight of water as a blowing agent, 0.05 parts by weight of catalyst-1 (foaming catalyst), 0.52 parts by weight of catalyst-2 (resinification catalyst), 1.5 parts by weight of foam stabilizer-2 (linear silicone-based foam stabilizer, viscosity 1560 mPa s (25°C), surface tension 20.6 mN / m (25°C)), and 41.8 parts by weight of isocyanate 1. Example 2 has a density of 43 kg / m 3, Number of cells: 12.5 / 25mm, Thermal conductivity: 0.045W / m K, Air permeability: 10cm 3 / cm 2 ·s, rebound was 42%.

[0051] Example 3 does not include polyether polyol A1 having an EO addition rate of 80% by weight, but includes 40 parts by weight of polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000 and a functionality of 3, 10 parts by weight of polyether polyol A2-2 having an EO addition rate of 15% by weight, a molecular weight of 7000 and a functionality of 3, 50 parts by weight of polyether polyol A3 consisting of a polymer polyol having an EO addition rate of 15% by weight, a molecular weight of 5000 and a functionality of 3, This is an example of production from a polyurethane foam composition consisting of 5 parts by weight of polyether polyol A4 with 2 functional groups, 1.2 parts by weight of crosslinker-1, 1.1 parts by weight of crosslinker-2, 2.7 parts by weight of water as a blowing agent, 0.05 parts by weight of catalyst-1 (foaming catalyst), 0.52 parts by weight of catalyst-2 (resinification catalyst), 1.5 parts by weight of foam stabilizer-2 (linear silicone-based foam stabilizer, viscosity 1560 mPa s (25°C), surface tension 20.6 mN / m (25°C)), and 32.5 parts by weight of isocyanate 1. Example 3 has a density of 56 kg / m 3 , Number of cells: 22.5 / 25mm, Thermal conductivity: 0.040W / m K, Air permeability: 2cm 3 / cm 2 ·s, rebound was 30%.

[0052] Example 4 is a polyol comprising 15 parts by weight of polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000, and a functionality of 3, 15 parts by weight of polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000, and a functionality of 3, 30 parts by weight of polyether polyol A2-2 having an EO addition rate of 15% by weight, a molecular weight of 7000, and a functionality of 3, and a polymer polyol having an EO addition rate of 15% by weight, a molecular weight of 5000, and a functionality of 3. This is an example of production from a polyurethane foam composition containing 40 parts by weight of Polyether Polyol A3, no crosslinking agent, 2.9 parts by weight of water as a blowing agent, 0.05 parts by weight of Catalyst-1 (foaming catalyst), 0.7 parts by weight of Catalyst-2 (resinification catalyst), 1.2 parts by weight of Foam Stabilizer-1 (linear silicone-based foam stabilizer, viscosity = 4840 mPa s (25 °C), surface tension = 22.7 mN / m (25 °C)), and 49.0 parts by weight of Isocyanate 2. Example 4 has a density of 56 kg / m 3 , Number of cells 7.5 / 25mm, Thermal conductivity 0.043W / m K, Air permeability 27cm 3 / cm 2 ·s, rebound was 56%.

[0053] Example 5 is a polyol comprising 10 parts by weight of polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000, and a functionality of 3, 30 parts by weight of polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000, and a functionality of 3, 10 parts by weight of polyether polyol A2-2 having an EO addition rate of 15% by weight, a molecular weight of 7000, and a functionality of 3, and a polymer polyol having an EO addition rate of 15% by weight, a molecular weight of 5000, and a functionality of 3. This is an example of production from a polyurethane foam composition consisting of 50 parts by weight of Terpolyol A3, 3 parts by weight of Crosslinker-3, 2.9 parts by weight of water as a blowing agent, 0.05 parts by weight of Catalyst-1 (foaming catalyst), 0.7 parts by weight of Catalyst-2 (resinification catalyst), 1.2 parts by weight of Foam Stabilizer-1 (linear silicone-based foam stabilizer, viscosity = 4840 mPa s (25 °C), surface tension = 22.7 mN / mmN / m (25 °C)), and 56.9 parts by weight of Isocyanate 2. Example 5 has a density of 60 kg / m 3, Number of cells: 17.5 / 25mm, Thermal conductivity: 0.042W / m K, Air permeability: 19cm 3 / cm 2 ·s, rebound was 45%.

[0054] Comparative Example 1 is an example produced from a polyurethane foam composition similar to that of Example 1, except that in Example 1, 1 part by weight of polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000, and 3 functional groups, and 39 parts by weight of polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000, and 3 functional groups, 3.4 parts by weight of water was used as a blowing agent, 0.5 parts by weight of foam stabilizer-4 (dimethylsiloxane copolymer, viscosity = 610 mPa s (25 ° C), surface tension = 20.8 mN / m (25 ° C)) was used instead of foam stabilizer-2, 44.8 parts by weight of isocyanate-1 was used, and other components were the same as those of Example 1. Comparative Example 1 has a density of 36 kg / m 3 , Number of cells: 42.5 / 25mm, Thermal conductivity: 0.037W / m K, Air permeability: 43cm 3 / cm 2 s, and the resilience was 67%. In Comparative Example 1, since foam stabilizer-2 (linear silicone foam stabilizer, viscosity 1560 mPa s (25°C), surface tension 20.6 mN / m (25°C)) was not used, the number of cells was larger and the thermal conductivity was lower than in Example 1.

[0055] Comparative Example 2 is an example produced from a polyurethane foam composition similar to that of Example 2, except that in Example 2, 1 part by weight of polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000, and 3 functional groups, and 39 parts by weight of polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000, and 3 functional groups, 3 parts by weight of water was used as a blowing agent, 0.5 parts by weight of foam stabilizer-4 (dimethylsiloxane copolymer, viscosity = 610 mPa s (25 ° C), surface tension = 20.8 mN / m (25 ° C)) was used instead of foam stabilizer-2, 36.9 parts by weight of isocyanate-1 was used, and other components were the same as those of Example 2. Comparative Example 2 has a density of 45 kg / m 3 , Number of cells: 47.5 / 25mm, Thermal conductivity: 0.036W / m K, Air permeability: 29cm 3 / cm2 s, and the resilience was 70%. In Comparative Example 2, since foam stabilizer-2 (linear silicone foam stabilizer, viscosity 1560 mPa s (25°C), surface tension 20.6 mN / m (25°C)) was not used, the number of cells was larger and the thermal conductivity was lower than in Example 2.

[0056] Comparative Example 3 is an example produced from a polyurethane foam composition similar to that of Example 3, except that 2.5 parts by weight of water was used as the blowing agent, 0.5 parts by weight of foam stabilizer-4 (dimethylsiloxane copolymer, viscosity = 610 mPa s (25°C), surface tension = 20.8 mN / m (25°C)) was used instead of foam stabilizer-2, and 34.0 parts by weight of isocyanate-1 was used. The other components were the same as those of Example 3. Comparative Example 3 has a density of 57 kg / m 3 , Number of cells: 57.5 / 25mm, Thermal conductivity: 0.035W / m K, Air permeability: 17cm 3 / cm 2 s, and the resilience was 63%. In Comparative Example 3, since foam stabilizer-2 (linear silicone-based foam stabilizer, viscosity 1560 mPa s (25°C), surface tension 20.6 mN / m (25°C)) was not used, the number of cells was larger and the thermal conductivity was lower than in Example 3.

[0057] Comparative Example 4 is an example produced from a polyurethane foam composition in which, in Example 4, 3 parts by weight of polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000, and a functional group of 3, 37 parts by weight of polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000, and a functional group of 3, 10 parts by weight of polyether polyol A2-2 having an EO addition rate of 15% by weight, a molecular weight of 7000, and a functional group of 3, and 50 parts by weight of polyether polyol A3 consisting of a polymer polyol having a functional group of 3 were used, 2.7 parts by weight of water was used as a blowing agent, 0.4 parts by weight of foam stabilizer-3 (a silicone-based foam stabilizer, viscosity 40 mPa·s (25°C), surface tension 20.9 mN / m (25°C)) was used instead of foam stabilizer-1, 46.5 parts by weight of isocyanate 2 was used, and the other components were the same as in Example 4. Comparative Example 4 has a density of 54 kg / m 3, Number of cells: 52.5 / 25mm, Thermal conductivity: 0.036W / m K, Air permeability: 18cm 3 / cm 2 s, and the resilience was 55%. In Comparative Example 4, since foam stabilizer-1 (linear silicone foam stabilizer, viscosity 4840 mPa s (25°C), surface tension = 22.7 mN / m (25°C)) was not used, the number of cells was larger and the thermal conductivity was lower than in Example 4.

[0058] Comparative Example 5 is an example produced from a polyurethane foam composition similar to that of Example 5, except that in Example 5, 2 parts by weight of polyether polyol A1 having an EO addition rate of 80% by weight, a molecular weight of 4000 and a functional group of 3, and 38 parts by weight of polyether polyol A2-1 having an EO addition rate of 15% by weight, a molecular weight of 5000 and a functional group of 3 were used, 2.7 parts by weight of water was used as a blowing agent, 0.4 parts by weight of foam stabilizer-3 (a silicone-based foam stabilizer, viscosity 40 mPa s (25°C), surface tension 20.9 mN / m (25°C)) was used instead of foam stabilizer-1, 57.4 parts by weight of isocyanate 2 was used, and the other components were the same as those of Example 5. Comparative Example 5 has a density of 59 kg / m 3 , Number of cells: 47.5 / 25mm, Thermal conductivity: 0.037W / m K, Air permeability: 28cm 3 / cm 2 s, and the resilience was 47%. In Comparative Example 5, since foam stabilizer-1 (linear silicone foam stabilizer, viscosity 4840 mPa s (25°C), surface tension = 22.7 mN / m (25°C)) was not used, the number of cells was larger and the thermal conductivity was lower than in Example 5.

[0059] Thus, the molded polyurethane foams of the Examples have higher thermal conductivity than the molded polyurethane foams of the Comparative Examples, and can improve the efficiency of heating and cooling the interior of a vehicle when used as an interior material for a vehicle. Furthermore, the molded polyurethane foams of the Examples have a cell count of 5 to 25 cells / 25 mm, and when used as a cushioning material for a vehicle seat cushion or the like, there is no risk of adversely affecting the cushioning properties or the feel when compressed. The molded polyurethane foam of the present invention can be used not only for seat cushions, but also for vehicle interior materials such as head rests and arm rests. [Explanation of symbols]

[0060] 10: Molded polyurethane foam 20: Mold 21: Lower mold 22: Upper mold N: Injection nozzle P: Polyurethane foam composition

Claims

1. A molded polyurethane foam composition comprising a high EO polyether polyol having an ethylene oxide addition rate of 75 to 100% by weight, a low EO polyether polyol having an ethylene oxide addition rate of 1 to 25% by weight, and a polymer polyol, the composition being obtained from a raw material of a composition for molded polyurethane foam containing 5 to 20 parts by weight of the high EO polyether polyol when the total of the high EO polyether polyol, the low EO polyether polyol, and the polymer polyol is taken as 100 parts by weight, A molded polyurethane foam with 4 to 30 cells / 25 mm and thermal conductivity of 0.039 to 0.050 W / m·K.

2. A vehicle interior material comprising the molded polyurethane foam according to claim 1.

3. A seat cushion comprising the molded polyurethane foam of claim 1.

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