Polyurethane foam molded product, method for producing same, and polyol composition

Abstract

To provide a polyurethane foam formed body having good appearance and thermal conductivity produced from a polyurethane foam that is used for OA equipment, electrical appliances, various other equipment and apparatuses, by a method for producing the same, preventing poor stirring of polyurethane foam raw material.SOLUTION: Provided is a method for producing polyurethane foam formed body in which a polyurethane foam formed body having thermal conductivity can be obtained from a polyurethane foam raw material containing a polyol, a catalyst, a foaming agent, a thermally conductive filler, a monool, and a polyisocyanate. The polyurethane foam raw material preferably contains a dispersant.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Polyurethane foam has traditionally been used as a vibration-damping or soundproofing material in office automation equipment, electrical appliances, and various other devices and equipment. For example, polyurethane foam is placed inside or on the exterior of the housing of PC hard disk drives and electric motors in electric vehicles to improve vibration-damping and soundproofing. In addition, some devices and equipment can become very hot due to heat generation during operation, so polyurethane foam is required to have good thermal conductivity in order to dissipate heat to the outside.

[0003] One method of imparting thermal conductivity to polyurethane foam is to blend a thermally conductive filler such as graphite into the polyurethane foam raw material. However, blending a large amount of thermally conductive filler into the polyurethane foam raw material to increase thermal conductivity reduces the ratio of isocyanate in the polyurethane foam raw material, making it difficult to mix uniformly, resulting in poor appearance quality such as molding defects due to poor mixing.

[0004] There is also a method for producing polyurethane foam by pouring (injecting) a foamed urethane resin raw material containing magnetic particles adhered to the surface of thermally conductive particles with a binder into the cavity of a foaming mold, and then foaming and molding the material while applying a magnetic field so that the magnetic flux density in the cavity is approximately uniform (Patent Document 1). However, the method of foam molding while applying a magnetic field has the problem of high costs for the equipment that generates the magnetic field. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5829279 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above points, and aims to obtain a polyurethane foam molded product having good thermal conductivity without causing poor appearance quality due to insufficient stirring of the polyurethane foam raw materials. [Means for solving the problem]

[0007] The first aspect is a molded polyurethane foam obtained from a polyurethane foam raw material containing a polyol, a polyisocyanate, a catalyst, a blowing agent, a thermally conductive filler, and a monool.

[0008] A second aspect is characterized in that, in the first aspect, the polyurethane foam raw material contains a dispersant.

[0009] The third aspect is a method for producing a polyurethane foam molded article, in which polyurethane foam raw materials containing a polyol, a polyisocyanate, a catalyst, a blowing agent, a thermally conductive filler, and a monol are stirred and foamed.

[0010] A fourth aspect is the third aspect, characterized in that the polyurethane foam raw material contains a dispersant.

[0011] A fifth embodiment is a polyol composition including a polyol, a catalyst, a blowing agent, a thermally conductive filler, and a monool.

[0012] The sixth aspect is a method for producing a polyurethane foam molded article, in which a polyol composition containing a polyol, a catalyst, a blowing agent, a thermally conductive filler, and a monool is stirred, and further mixed with a polyisocyanate to form the foam. [Effects of the Invention]

[0013] By including a monool in a polyurethane foam raw material containing a thermally conductive filler, the present invention prevents poor stirring of the polyurethane foam raw material, thereby producing a polyurethane foam molded product with good appearance and thermal conductivity. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a table showing the formulations of polyurethane foams and the results of measuring physical properties in Examples and Comparative Examples. [Figure 2] 1 is a graph showing the raw material viscosity at 20° C. in Examples and Comparative Examples. [Figure 3] 1 is a graph showing thermal conductivity in Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE INVENTION The polyurethane foam molded article of the present invention is obtained from a polyurethane foam raw material containing a polyol composition and a polyisocyanate. The polyol composition includes a polyol, a catalyst, a blowing agent, a thermally conductive filler, and a monool.

[0016] As the polyol, polyols for polyurethane foams can be used, such as polyether polyols, polyester polyols, polyether ester polyols, etc., and one or more of these may be used.

[0017] Examples of polyether polyols include alcohols (polyhydric alcohols) having two or more functional groups, or those produced by addition polymerization of ethylene oxide or propylene oxide using these as initiators, and polyether polyols in which alkylene oxides such as ethylene oxide (EO) or propylene oxide (PO) are added to polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, and sucrose.

[0018] Examples of polyester polyols include polyester polyols obtained by polycondensation of an aliphatic carboxylic acid such as malonic acid, succinic acid, or adipic acid, or an aromatic carboxylic acid such as phthalic acid, and an aliphatic glycol such as ethylene glycol, diethylene glycol, or propylene glycol. Examples of polyetherester polyols include those obtained by reacting the above-mentioned polyether polyols with polybasic acids to form polyesters, and those having both polyether and polyester segments in one molecule.

[0019] The polyol preferably contains one or more polyols having a hydroxyl value (OHV) of 10 to 280 mgKOH / g, an average number of functional groups of 2 to 5, and a number average molecular weight of 800 to 10,000 (more preferably 2,000 to 7,000). The lower limit of the hydroxyl value (OHV) is more preferably 20 mgKOH / g or more, and even more preferably 30 mgKOH / g or more, and the upper limit of the hydroxyl value (OHV) is more preferably 200 mgKOH / g or less, and even more preferably 150 mgKOH / g or less. The upper limit of the average number of functional groups is more preferably 4.5 or less, and even more preferably 4 or less.

[0020] The catalyst may be one known for use in polyurethane foams. Examples include amine catalysts such as triethylamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, N-ethylmorpholine, and tetramethylguanidine; tin catalysts such as stannous octoate and dibutyltin dilaurate; and metal catalysts (also known as organometallic catalysts) such as phenylmercury propionate and lead octenate. The amount of catalyst is preferably about 0.2 to 2.5 parts by weight per 80 parts by weight of polyol. The lower limit of the catalyst amount is more preferably 0.3 parts by weight or more, and even more preferably 0.4 parts by weight or more. The upper limit of the catalyst amount is more preferably 2.0 parts by weight or less, and even more preferably 1.5 parts by weight or less.

[0021] From the viewpoint of mixing raw materials, it is preferable that water is used as the blowing agent. The amount of blowing agent (water) is preferably 0.5 to 2.0 parts by weight per 80 parts by weight of polyol, although this amount depends on the desired density and thermal conductivity of the molded body to be molded. When the molded body has a relatively high density and high thermal conductivity, the lower limit of the amount of blowing agent (water) is more preferably 0.6 parts by weight or more, and even more preferably 0.7 parts by weight or more. When the molded body has a relatively low density, the upper limit of the amount of blowing agent (water) is more preferably 1.8 parts by weight or less, and even more preferably 1.5 parts by weight or less. If the amount of foaming agent (water) is less than 0.5 parts by weight, the mixing and reactivity of the raw materials will be poor, resulting in molding defects. On the other hand, if it exceeds 2.0 parts by weight, the amount of foaming gas will increase, causing cracks inside the molded product and reducing thermal conductivity.

[0022] Examples of the thermally conductive filler include expanded graphite, expanded graphite, alumina, magnesium oxide, silicon (metallic silicon), boron nitride, etc. Here, expanded graphite can be obtained by chemically treating graphite such as flake graphite with sulfuric acid or the like to obtain expandable graphite, which is then expanded by heat treatment and then refined. The amount of thermally conductive filler to be blended depends on the desired density and thermal conductivity of the molded body to be formed, but is preferably 35 to 150 parts by weight per 80 parts by weight of polyol. When the molded body has a relatively low density, the lower limit of the amount of thermally conductive filler to be blended can be set more preferably to 50 parts by weight or more, and even more preferably to 80 parts by weight or more. When the molded body has a relatively high density and high thermal conductivity, the upper limit of the amount of thermally conductive filler to be blended can be set more preferably to 140 parts by weight or less, and even more preferably to 130 parts by weight or less. If the amount of the thermally conductive filler is too small, the thermal conductivity of the polyurethane foam molding will be low, whereas if the amount is too large, the foaming properties of the polyurethane foam will be poor.

[0023] The thermally conductive filler preferably uses a large particle size thermally conductive filler having an average particle size of 30 μm or more and 400 μm or less in combination with a small particle size thermally conductive filler having an average particle size of 3 μm or more and less than 30 μm. It is more preferable that the large particle size thermally conductive filler has the average particle size (D50) shown in (1) below, or the particle size distribution shown in (2). (1) Preferred range for average particle size (D50) The average particle size (D50) is preferably 30 μm or more, more preferably 40 μm or more, even more preferably 90 μm or more, and even more preferably 150 μm or more, while the upper limit is preferably 400 μm or less, more preferably less than 300 μm. (2) Preferred range by sieve Particle classification is measured in accordance with "JIS K0069 Sieving test method for chemical products." After determining the sieve residue in descending order of particle size range, the sieve residue is integrated to determine the integrated percentage corresponding to each sieve opening. The sieve opening corresponding to a cumulative distribution of 50 wt% (cumulative distribution 50 wt% particle diameter) is treated as the average particle diameter (D50). The cumulative distribution 50 wt% particle diameter corresponding to the average particle diameter is preferably in the following range: Of the sieves with a plurality of openings, the smaller sieve opening has a particle size (opening) corresponding to a cumulative distribution of 50 wt% or more of preferably 45 μm or more, more preferably 90 μm or more, and even more preferably 180 μm or more. On the other hand, among sieves with a plurality of openings, the larger sieve opening has a particle size (opening) corresponding to a cumulative distribution of less than 50 wt% of preferably 500 μm or less, more preferably 355 μm or less, and even more preferably 300 μm. By using a combination of large particle size thermally conductive fillers and small particle size thermally conductive fillers, the state of the thermally conductive fillers in the polyurethane foam is such that the small particle size thermally conductive fillers are densely packed between the large particle size thermally conductive fillers, making it easier for heat to be transferred between the thermally conductive fillers and improving the thermal conductivity of the polyurethane foam molded body.

[0024] The ratio (weight ratio) of the large particle size thermally conductive filler to the total amount of the thermally conductive filler is preferably 30 to 90%, more preferably 50 to 90%, and even more preferably 70 to 90%. By setting the ratio within this range, the large particle size thermally conductive filler and the small particle size thermally conductive filler are densely arranged, thereby increasing the thermal conductivity.

[0025] The monool is a compound having one hydroxyl group (monohydric alcohol). The monool in the present invention may be any of primary alcohol, secondary alcohol, and tertiary alcohol, and may be either linear or branched. Preferably, it is a primary alcohol and linear. The monool is not limited to one type, and two or more types may be used. If the molecular weight of the monool is too large, the viscosity-reducing effect of the polyurethane foam raw material cannot be obtained, and if it is too small, the molded product becomes brittle, so the number-average molecular weight is preferably 200 to 3000, more preferably 300 to 2500, and even more preferably 400 to 2000. If the amount of monool is too small, the effect cannot be obtained, and if it is too large, the molded product becomes brittle, so the amount is preferably 5 to 25 parts by weight, more preferably 10 to 22 parts by weight, and even more preferably 15 to 20 parts by weight, per 80 parts by weight of polyol.

[0026] A preferred auxiliary agent added to the polyol composition is a dispersant. Examples of dispersants include urethane-based dispersants, polyethyleneimine-based dispersants, polyoxyethylene alkyl ether-based dispersants, polyoxyethylene glycol diester-based dispersants, and sorbitan aliphatic ester-based dispersants. These dispersants may be used alone or in combination. When a dispersant is used, the amount of the dispersant added is preferably 1 to 6 parts by weight, more preferably 1 to 4 parts by weight, per 80 parts by weight of the polyol. By incorporating a dispersant into the polyol composition together with the monool, the increase in viscosity of the polyurethane foam raw material due to the incorporation of the thermally conductive filler can be more effectively suppressed, making it even less likely that the polyurethane foam raw material will be stirred or mixed poorly.In addition, the thermally conductive filler is dispersed uniformly, resulting in good thermal conductivity of the molded product.

[0027] The polyol composition may contain other additives such as a foam stabilizer, a foam opener, a colorant, and a flame retardant. As the foam stabilizer, any foam stabilizer known for polyurethane foams can be used, including, for example, silicone-based foam stabilizers, fluorine-based foam stabilizers, and known surfactants.

[0028] Examples of the cell breaker include hydrocarbon-based, ester-based, and silicone-based agents, and two or more of these may be used in combination. Examples of hydrocarbon-based cell openers include oils such as polybutene. Examples of ester-based cell openers include dimer acid diesters. Examples of silicone-based cell openers include cyclopentasiloxane.

[0029] As the colorant, a colorant such as a carbon pigment can be used depending on the intended use of the polyurethane foam. The flame retardant may be a powder flame retardant such as a phosphorus-based flame retardant or ammonium polyphosphate, or a liquid flame retardant such as a phosphate ester-based flame retardant, and either one or both may be used in combination.

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

[0031] The isocyanate index (INDEX) is preferably 75 to 120. The isocyanate index is calculated by [(isocyanate equivalent in polyurethane foam raw material / active hydrogen equivalent in polyurethane foam raw material)×100].

[0032] The polyurethane foam molded article of the present invention has a density (JIS K 7222) of 200 to 600 kg / m, depending on the desired thermal conductivity of the molded article. 3 In order to obtain high thermal conductivity, the density is preferably set to 400 to 600 kg / m 3 In order to obtain relatively high thermal conductivity even at low density, the density should be 200 to 400 kg / m 3 The degree is preferable. The polyurethane foam molded product of the present invention preferably has a thermal conductivity (measured using a measuring instrument QTM500 manufactured by Kyoto Electronics Manufacturing Co., Ltd., which measures thermal conductivity using a hot wire method) of 0.10 W / m K or more, more preferably 0.20 W / m K or more, and even more preferably 0.30 W / m K or more.

[0033] The polyurethane foam molding is produced by a mold foam molding method in which the polyurethane foam composition is stirred, and then a polyurethane foam raw material containing polyisocyanate is mixed and stirred, poured into a mold, foamed in the mold, and then the mold is opened and the molded product is removed. The mold cavity has a shape appropriate for the intended use of the polyurethane foam molding. [Example]

[0034] Polyurethane foam molded articles of each Example and Comparative Example were produced by mold expansion molding. Specifically, polyurethane foam raw materials consisting of a polyol composition (liquid A) and a polyisocyanate (liquid B) in the formulation shown in Figure 1 were mixed using the following raw materials, and poured into a cavity (150 x 400 x 10 mm) of a lower mold. The upper mold was then placed on top to close the mold, and the mold was opened after 8 minutes to obtain a polyurethane foam molded article. The mold was heated to 60°C before use.

[0035] Polyol: Polyether polyol, molecular weight 5000, hydroxyl value 34 mg KOH / g, functionality 3, product number: Sannix FA-703, Sanyo Chemical Industries, Ltd. Catalyst: Part number: DABCO 33LSI, EVONIK Foam stabilizer: Silicone foam stabilizer, product number: B8738LF2, EVONIK Foaming agent: Water Thermally conductive filler: Expanded graphite, average particle size (D50) 300 μm, product number: SYZR502FP, Sanyo Trading Co., Ltd. Thermally conductive filler: Metal silicon, average particle size 20 μm, product number: #200, Kinsei Matec Co., Ltd. Monool: Polyoxyethylene polyoxypropylene butyl ether, molecular weight 600-1000, hydroxyl value 42mgKOH / g, product number: Newpol 50HB-400, Sanyo Chemical Industries, Ltd. Dispersant 1: Salt of unsaturated polyaminoamide and low molecular weight polyester acid, product number: ANTI-TERRA-U100, BYK Japan Co., Ltd. Dispersant 2: Alkyl ammonium salt of acidic copolymer, product number: BYK-W969, BYK Japan Co., Ltd. Dispersant 3: Alkyl ammonium salt of polymer copolymer, product number: BYK-9076, BYK Japan Co., Ltd. Polyisocyanate: Crude MDI, NCO%=31.5%, Part Number: M5S, BASF INOAC Polyurethanes Ltd.

[0036] For each example and comparative example, the viscosity (mPa·s) of the polyurethane foam raw material at 20°C, 30°C, and 40°C was measured using a B-type viscometer (TVB-15, manufactured by Toki Sangyo Co., Ltd.). In addition, for each example and each comparative example, the stirring property of the polyurethane foam raw material was judged, and the density (kg / m) of the polyurethane foam molded product was also evaluated. 3 ) and thermal conductivity (W / m K).

[0037] Stirring was evaluated by visually inspecting the appearance of the polyurethane foam molded body obtained by stirring the polyurethane foam raw materials for 8 seconds in a lab mixer and then pouring them into a mold. If there were no problems with the appearance or the interior, the result was evaluated as "no mixing failure." If there were any defects in the appearance, such as unreacted areas due to uneven stirring, the result was evaluated as "yes." The rotating blades of the lab mixer used had a diameter of 80 mm and a rotation speed of 2000 rpm. Density (kg / m 3 ) was measured based on JIS K 7222. Thermal conductivity (W / m·K) was measured using a measuring instrument (QTM500, Kyoto Electronics Manufacturing Co., Ltd.) that measures thermal conductivity using the hot wire method. It is preferable to compare and evaluate thermal conductivity at similar densities, taking into account variations in the density of the material. Therefore, the thermal conductivity per unit density [(W / m K) / (kg / m]] is calculated using the obtained density and thermal conductivity. 3 )] was calculated and evaluated as thermal conductivity. The thermal conductivity of each example was evaluated as follows: if the thermal conductivity value was higher than that of the comparative example, it was marked "Good", if it was about the same, it was marked "Average", and if it was lower, it was marked "Poor". In addition, the density of the material is 200 to 300 kg / m 3 At this level, the thermal conductivity per unit density is 0.35 (W / m K) / (kg / m 3 )] or more is preferable, and 0.4 [(W / m K) / (kg / m 3 )] or more is more preferable. The density of the material is 400 to 600 kg / m 3 At this level, the thermal conductivity per unit density is 0.5 [(W / m K) / (kg / m 3 )] or more is preferable, and 0.55 [(W / m K) / (kg / m 3 )] or more is more preferable, and 0.6 [(W / m K) / (kg / m 3 ) or more is even more preferable.

[0038] In Examples 1 to 4 and Comparative Example 1, the density of the polyol molded body was 480 kg / m 3 This is an example in which the amount of foaming agent (water) was adjusted so that the temperature was in the range of 100°C to 120°C. Example 1 Example 1 is an example in which the components were 80 parts by weight of polyol, 0.50 parts by weight of catalyst, 0.20 parts by weight of foam stabilizer, 0.75 parts by weight of blowing agent (water), 100 parts by weight of expanded graphite, 25 parts by weight of metallic silicon, 20 parts by weight of monool, 0 parts by weight of dispersant 1-3, and an isocyanate index of 100. In Figure 1, "solid content (%)" refers to the percentage of the thermally conductive filler (expanded graphite + metallic silicon) content in the polyurethane foam raw materials (liquid A + liquid B). Also, "A(100) / B" in Figure 1 refers to the amount of liquid B required per 100 g of liquid A.

[0039] In Example 1, the viscosity was 24,000 mPa·s at 20°C, 11,000 mPa·s at 30°C, and 8,200 mPa·s at 40°C, there was no stirring failure, and the density was 470 kg / m 3 The thermal conductivity was 0.24 W / m·K, the thermal conductivity was 0.51, and the thermal conductivity evaluation was "△" as it was equivalent to that of Comparative Example 1. In Example 1, since monool was blended, the viscosity was low and there was no poor stirring.

[0040] Example 2 Example 2 is the same as Example 1, except that 3.0 parts by weight of Dispersant 1 was added to the formulation of Example 1. In Example 2, the viscosity was 20,000 mPa·s at 20°C, 9,300 mPa·s at 30°C, and 4,900 Pa·s at 40°C, there was no stirring failure, and the density was 500 kg / m 3 The thermal conductivity was 0.33 W / m·K, the thermal conductivity was 0.66, and the thermal conductivity evaluation was "Good", which is higher than that of Comparative Example 1. In Example 2, like Example 1, there was no stirring failure, and furthermore, since Dispersant 1 was blended together with the monool, the viscosity was lower than in Example 1 and the thermal conductivity was higher.

[0041] Example 3 Example 3 is the same as Example 1, except that 3.0 parts by weight of Dispersant 2 was added to the formulation of Example 1. In Example 3, the viscosity was 23,000 mPa·s at 20°C, 9,100 mPa·s at 30°C, and 8,700 Pa·s at 40°C, there was no stirring failure, and the density was 490 kg / m 3 The thermal conductivity was 0.30 W / m·K, the thermal conductivity was 0.61, and the thermal conductivity evaluation was "Good", which is higher than that of Comparative Example 1. In Example 3, like Example 1, there was no stirring failure, and furthermore, since Dispersant 2 was blended together with the monool, the viscosity was lower than in Example 1 and the thermal conductivity was higher.

[0042] Example 4 Example 4 is the same as Example 1, except that 3.0 parts by weight of Dispersant 3 was added to the formulation of Example 1. In Example 4, the viscosity was 18,000 mPa·s at 20°C, 8,700 mPa·s at 30°C, and 5,700 Pa·s at 40°C, there was no stirring failure, and the density was 490 kg / m 3 The thermal conductivity was 0.31 W / m·K, the thermal conductivity was 0.63, and the thermal conductivity evaluation was "Good", which is higher than that of Comparative Example 1. In Example 4, like Example 1, there was no stirring failure, and furthermore, since Dispersant 3 was blended together with the monool, the viscosity was lower than in Example 1 and the thermal conductivity was higher.

[0043] Comparison Example 1 Comparative Example 1 is a comparative example that serves as the basis for comparison with Examples 1-4, and is an example in which the polyol was 100 parts by weight, the amount of monool and dispersant 1-3 was 0 parts by weight, and the other conditions were the same as those of Examples 1-4. In Comparative Example 1, the viscosity was 42000 mPa·s at 20°C, 17000 mPa·s at 30°C, and 11000 mPa·s at 40°C, and there was poor stirring. The density was 470 kg / m 3 , thermal conductivity 0.24 W / m·K, thermal conductivity 0.51. In Comparative Example 1, since no monool was blended, the viscosity was higher than in Examples 1-4, and poor stirring occurred. Furthermore, Comparative Example 1 did not contain Dispersant 1-3, and therefore had lower thermal conductivity than Example 2-4.

[0044] In Example 5 and Comparative Example 2, the density of the polyol molded body was 240 kg / m 3 This is an example in which the amount of foaming agent (water) was adjusted so that the temperature was in the range of 100°C to 120°C. Example 5 Example 5 is an example similar to Example 2, except that the amount of the blowing agent (water) in Example 2 was increased to 1.70 parts by weight and the amount of Dispersant 1 was reduced to 1.5 parts by weight. In Example 5, the viscosity was 21000 mPa·s at 20°C, 1300 mPa·s at 30°C, and 7400 Pa·s at 40°C, there was no stirring failure, and the density was 240 kg / m 3 The thermal conductivity was 0.10 W / m·K, the thermal conductivity was 0.42, and the thermal conductivity evaluation was "Good" as it was higher than that of Comparative Example 2 to which it was compared. In Example 5, since a monool was blended, the viscosity was low and there was no poor stirring. In addition, since a dispersant was also blended, the thermal conductivity was higher than that of Comparative Example 2.

[0045] Comparative Example 2 Comparative Example 2 is a comparative example that serves as the basis for comparison with Example 5, and is an example in which the polyol was 100 parts by weight, the amount of monool and dispersant 1-3 was 0 parts by weight, and the other conditions were the same as those of Example 5. In Comparative Example 2, the viscosity was 41000 mPa·s at 20°C, 27000 mPa·s at 30°C, and 13000 mPa·s at 40°C, and there was poor stirring. The density was 240 kg / m 3 , thermal conductivity 0.08 W / m·K, thermal conductivity 0.33. In Comparative Example 2, since no monool was blended, the viscosity was higher than in Example 5, and poor stirring occurred. Furthermore, Comparative Example 2 had lower thermal conductivity than Example 2 because Dispersant 1-3 was not blended.

[0046] The viscosity measurement results of the polyurethane foam raw materials for Examples 1-4 and Comparative Example 1, which is the comparison model for Examples 1-4, and Example 5 and Comparative Example 2, which is the comparison model for Examples 5-4, are shown in FIG. 2, and the thermal conductivity results are shown in FIG.

[0047] Thus, according to the present invention, poor mixing of polyurethane foam raw materials can be prevented, and a polyurethane foam molded product with good appearance quality and thermal conductivity can be obtained. The present invention is not limited to the examples, and can be modified within the scope of the invention.

Claims

1. A polyurethane foam molded article obtained from a polyurethane foam raw material containing a polyol, a catalyst, a blowing agent, a thermally conductive filler, a monool, and a polyisocyanate, The polyurethane foam raw material contains a dispersant, The number average molecular weight of the monool is 600 to 1,000.

2. A method for producing a polyurethane foam molded article, comprising agitating and foaming a polyurethane foam raw material containing a polyol, a catalyst, a blowing agent, a thermally conductive filler, a monool, and a polyisocyanate, the method comprising: The polyurethane foam raw material contains a dispersant, A method for producing a polyurethane foam molded article, wherein the monool has a number average molecular weight of 600 to 1,000.

3. A polyol composition comprising a polyol, a catalyst, a blowing agent, a thermally conductive filler, and a monool, The polyol composition includes a dispersant, The polyol composition for producing a polyurethane foam molded article, wherein the monool has a number average molecular weight of 600 to 1,000.

4. A polyurethane foam molded article obtained from a polyurethane foam raw material containing a polyol, a catalyst, a blowing agent, a thermally conductive filler, a monool, and a polyisocyanate, Density is 200 kg / m ３ ~600 kg / m ３ and the number average molecular weight of the monool is 200 to 3,000; The thermally conductive filler includes a large particle size thermally conductive filler having an average particle size of 30 μm or more and 400 μm or less, and a small particle size thermally conductive filler having an average particle size of 3 μm or more and less than 30 μm, the small particle size thermally conductive filler comprises silicon metal; A polyurethane foam molded article, wherein the weight ratio of the large particle size thermally conductive filler to the total amount of the thermally conductive filler is 70 to 90%.

5. A method for producing a polyurethane foam molded article, comprising agitating and foaming a polyurethane foam raw material containing a polyol, a catalyst, a blowing agent, a thermally conductive filler, a monool, and a polyisocyanate, the method comprising: The density of the polyurethane foam molding is 200 kg / m ３ ~600 kg / m ３ and the number average molecular weight of the monool is 200 to 3,000; The thermally conductive filler includes a large particle size thermally conductive filler having an average particle size of 30 μm or more and 400 μm or less, and a small particle size thermally conductive filler having an average particle size of 3 μm or more and less than 30 μm, the small particle size thermally conductive filler comprises silicon metal; A method for producing a polyurethane foam molded article, wherein the weight ratio of the large particle size thermally conductive filler to the total amount of the thermally conductive filler is 70 to 90%.

Images