Cushion pad for vehicle and seat cushion for vehicle

Abstract

The present invention provides a vehicle cushion pad and a vehicle seat cushion, the vehicle cushion pad comprising a polyurethane foam, the polyurethane foam being formed from a polyurethane foam composition comprising a polyol, an isocyanate, a catalyst, a foaming agent, and an additive, the additive is a dicarboxylic acid ester compound with the weight-average molecular weight of 500-5000, and the air permeability of the polyurethane foaming body according to JIS K 6400-7: 2012 is 6.0 cc / cm < 2 > / second or above; the vehicle seat cushion comprises a seat cushion main body and the vehicle cushion which is laminated on the seat cushion main body.

Description

[0001] This invention patent application is a divisional application of the Chinese invention patent application with application number 202110324173.9, application date March 26, 2021, and invention name “Vehicle Cushion and Vehicle Seat Cushion”. Technical Field

[0002] The present invention relates to a vehicle cushion pad and a vehicle seat pad in which the vehicle cushion pad is placed on a seat pad main body. Background Art

[0003] Conventionally, there is a vehicle seat cushion in which a cushion pad is placed on a seat cushion main body in order to improve a sitting feeling.

[0004] For example, Patent Document 1 discloses a vehicle seat pad in which a soft plate-type polyurethane foam is laminated on a mold pad (Patent Document 1).

[0005] Prior art literature

[0006] Patent Literature

[0007] [Patent Document 1] Japanese Patent No. 4393453 Summary of the invention

[0008] Problems to be solved by the invention

[0009] However, in conventional vehicle seats, it is desired to reduce the discomfort caused by vibrations during vehicle travel.

[0010] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle cushion pad that reduces discomfort caused by vibration during vehicle running, and a vehicle seat pad in which the vehicle cushion pad is placed on a seat pad main body.

[0011] Means used to solve problems

[0012] Means of the present invention for solving the above-mentioned problems and achieving the objects are shown below.

[0013] (1) A vehicle cushion, comprising a polyurethane foam, wherein the polyurethane foam is formed from a polyurethane foam composition comprising a polyol, an isocyanate, a catalyst, a foaming agent and an additive, wherein the additive is a dicarboxylic acid ester compound having a weight average molecular weight of 500 to 5000, and the air permeability of the polyurethane foam according to JIS K 6400-7:2012 is 6.0 cc / cm 2 / second or more.

[0014] (2) The vehicle crash pad according to (1) is characterized in that the resonance magnification of the polyurethane foam according to the vibration test of JASO B407 is 1.5 to less than 3.43, and the integrated value of the transmissibility 1 or more at a vibration frequency of 5 Hz to 10 Hz is 500 to less than 915.

[0015] (3) The vehicle crash pad according to (1) or (2), wherein the polyurethane foam has a hardness of 80N to 250N according to JISK 6400-2:2012 6.7D method.

[0016] (4) The vehicle crash pad according to any one of (1) to (3), wherein the dicarboxylic acid ester compound having a weight average molecular weight of 500 to 5000 has a melting point of -20°C or higher.

[0017] (5) The vehicle crash pad according to any one of (1) to (4), wherein the density of the polyurethane foam according to JIS K 7220 is 30 kg / m 3 ~150kg / m 3 .

[0018] (6) A vehicle seat cushion, comprising: a seat cushion body; and a cushion pad according to any one of (1) to (5) stacked on the seat cushion body.

[0019] Effects of the Invention

[0020] According to the first aspect of the present invention, the additive contained in the polyurethane foam composition is a dicarboxylic acid ester compound having a weight average molecular weight of 500 to 5000, and the air permeability of the polyurethane foam according to JIS K 6400-7:2012 is 6.0 cc / cm 2 / second or more, thereby reducing the discomfort caused by vibration when the vehicle is running.

[0021] Regarding the vibration riding feel performance of the seat cushion, according to British Standard 6841 (BS6841), the discomfort of the up and down vibration of the seat is most sensitive at a frequency of 5Hz to 16Hz, and the sensitivity to the discomfort decreases as it moves away from this frequency band.

[0022] In the second aspect of the present invention, since the resonance magnification of the polyurethane foam according to the vibration test of JASO B407 is as low as 1.5 to less than 3.43, the sensitivity of the passenger to discomfort is blunted. In addition, since the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz at which discomfort is felt is as low as 500 to less than 915, the discomfort felt is reduced and the riding feeling becomes good.

[0023] According to the third aspect of the present invention, the hardness of the polyurethane foam according to JIS K 6400-2:2012 6.7D method is 80N to 250N, whereby bottoming out during seating can be suppressed and a good riding feeling can be provided.

[0024] According to the fourth aspect of the present invention, since the melting point of the dicarboxylic acid ester compound having a weight average molecular weight of 500 to 5000 is -20°C or higher, the touch when sitting can be improved.

[0025] According to the fifth aspect of the present invention, the density of the polyurethane foam according to JIS K 7220 is 30 kg / m 3 ~150kg / m 3 , which makes bottoming out less likely to occur, and also improves cushioning and becomes lighter, which can help reduce the weight of the vehicle.

[0026] According to the sixth aspect of the present invention, the vehicle seat pad in which the cushion pad of the present invention is laminated on the seat pad main body can reduce the discomfort caused by vibration during vehicle running due to the effect of the cushion pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] [ Figure 1 ] is a cross-sectional view of an embodiment of a vehicle seat in which a cushion pad of the present invention is placed on a seat cushion.

[0028] Explanation of symbols

[0029] 10 Vehicle seats

[0030] 11 Seat frame

[0031] 21 Seat cushion body

[0032] 31 cushion

[0033] 35 skin material

[0034] 40 Vehicle Seat Cushion DETAILED DESCRIPTION

[0035] Below, use Figure 1 The illustrated vehicle seat 10 will be used to describe an embodiment of a vehicle cushion pad and a vehicle seat pad according to the present invention.

[0036] Figure 1 The illustrated vehicle seat 10 includes a seat frame 11 , a seat cushion main body 21 , a cushion pad 31 , and a skin material 35 .

[0037] The cushion pad 31 includes the vehicle cushion pad of the present invention, and the seat pad main body 21 and the cushion pad 31 constitute the vehicle seat pad 40 of the present invention.

[0038] It should be noted that Figure 1 Only the seat side is shown, and the backrest side is omitted. In the case of a temperature-controlled seat cushion, a heater (not shown) is arranged on the cushion pad 31 , and each heater is covered with a skin material 35 .

[0039] The seat frame 11 supports the vehicle seat and is fixed in the vehicle compartment. The seat frame 11 is made of a highly rigid material such as metal and has a structure corresponding to the vehicle type.

[0040] The seat cushion body 21 includes an elastic foam such as a polyurethane foam. Compared with the cushion pad 31, the seat cushion body 21 has a high hardness and a small reduction in elastic recovery force due to long-term use, so that it can support the weight of the passenger. As a preferred seat cushion body 21, it is preferred to have a hardness (JIS K 6400-2: 2012 6.7 D method) of 80N to 250N and a density (JIS K 7222) of 30kg / m 3 ~150kg / m 3 , more preferably 50kg / m 3 ~100kg / m 3 , polyurethane foam having a rebound resilience (JIS K 6400-3:2011) of 25% to 55%.

[0041] In order to improve the support of the seated person's buttocks, the upper surface of the seat cushion body 21 shown in the figure has both left and right side portions raised and a lowered center portion. The cushion pad 31 is placed on the lowered center portion.

[0042] The crash pad (vehicle crash pad of the present invention) 31 is formed of a polyurethane foam composition (polyurethane foam raw material) containing a polyol, an isocyanate, a catalyst, a foaming agent, and additives.

[0043] As the polyol, a polyol for polyurethane foam can be used, and for example, any of polyether polyol, polyester polyol, polyether ester polyol and the like can be used, and one or more kinds thereof can be used.

[0044] Examples of the polyether polyol include polyether polyols obtained by adding alkylene oxides such as ethylene oxide (EO) and propylene oxide (PO) to polyols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butanediol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, and sucrose.

[0045] Examples of the polyester polyol include polyester polyols obtained by polycondensation of aliphatic carboxylic acids such as malonic acid, succinic acid, and adipic acid, aromatic carboxylic acids such as phthalic acid, and aliphatic diols such as ethylene glycol, diethylene glycol, and propylene glycol.

[0046] Examples of the polyether ester polyol include polyether ester polyols obtained by polyesterification by reacting the above polyether polyols with polybasic acids, and polyether ester polyols having both polyether and polyester segments in one molecule.

[0047] As for the polyol, it is preferred to use alone or in combination a polyol having a hydroxyl value (OHV) of 30 to 300 mgKOH / g, a functional group number of 2 to 4, and a molecular weight Mw of preferably 500 to 7000, more preferably 2000 to 6000.

[0048] As isocyanate, aliphatic or aromatic polyisocyanates with more than 2 isocyanate groups, their mixtures and modified polyisocyanates obtained by modifying them can be used. As aliphatic polyisocyanates, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate etc. can be listed, and as aromatic polyisocyanates, toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate, xylylene diisocyanate, polymerized MDI (crude MDI) etc. can be listed. It should be noted that, the prepolymer with isocyanate group at the end obtained by polyol and excessive polyisocyanate reaction can also be used.

[0049] The isocyanate index (INDEX) of the composition is preferably 90 to 130. The isocyanate index is calculated by [(isocyanate equivalent in the polyurethane foam raw material / equivalent of active hydrogen in the polyurethane foam raw material)×100].

[0050] As the catalyst, a known catalyst used for polyurethane foam can be used. For example, amine catalysts such as triethylamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, N-ethylmorpholine, and tetramethylguanidine; tin catalysts such as stannous octoate and dibutyltin dilaurate; metal catalysts (also called organometallic catalysts) such as phenylmercuric propionate and lead octenate. The total amount of the catalyst is preferably about 0.1 to 2 parts by weight relative to 100 parts by weight of the polyol.

[0051] As the foaming agent, water, alternative freon or hydrocarbons such as pentane can be used alone or in combination. In the case of water, carbon dioxide gas is generated during the reaction of polyisocyanate, and foaming is performed using the carbon dioxide gas. The amount of water as the foaming agent is preferably about 1 to about 6 parts by weight relative to 100 parts by weight of the polyol. In addition, when other foaming agents are used together with water, the amount of the other foaming agents can be appropriately determined.

[0052] As the additive, a dicarboxylic acid ester having a weight average molecular weight of 500 to 5000 is used. The weight average molecular weight of the dicarboxylic acid ester is preferably 800 to 3000. The dicarboxylic acid ester compound is an ester condensate of a dicarboxylic acid and an alcohol, and the terminal of the alcohol portion may be not only a carbon but also a hydroxyl group or an amino group.

[0053] When the weight average molecular weight of the dicarboxylic acid ester compound is less than 500, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz in the vibration test becomes large, and the effect of reducing the discomfort caused by vibration becomes small. On the other hand, when the weight average molecular weight of the dicarboxylic acid ester compound is greater than 5000, the viscosity of the polyurethane foam composition becomes high, and a polyurethane foam in a good foamed state that can be used as a cushion cannot be obtained.

[0054] The dicarboxylate compound having a weight average molecular weight of 500 to 5000 preferably has a melting point of -20°C or higher, more preferably 0°C or higher, and further preferably 25°C or higher. The dicarboxylate compound having a melting point of -20°C or higher and a weight average molecular weight of 500 to 5000 can provide a good touch when sitting.

[0055] The amount of the dicarboxylic acid ester compound having a weight average molecular weight of 500 to 5000 in the composition is preferably about 5 to 150 parts by weight, more preferably 10 to 100 parts by weight, relative to 100 parts by weight of the polyol. When the amount is less than 5 parts by weight, the effect of reducing discomfort caused by vibration becomes small. On the other hand, when the amount is greater than 150 parts by weight, a polyurethane foam in a good foaming state that can be used as a cushion cannot be obtained.

[0056] As dicarboxylic acid ester compounds having a weight average molecular weight of 500 to 5000 that can be used in the present invention, for example, there can be listed: dimer acid distearyl ester (weight average molecular weight: 900, melting point: 23°C, OH value: 10), dimer acid dilauryl ester (weight average molecular weight: 815, melting point: 23°C, OH value: 10), dimer acid polyester polyol (weight average molecular weight: 2500, melting point: less than -20°C, OH value: 74.4), etc.

[0057] Examples of other main components that may be appropriately added to the polyurethane foam composition include surfactants, flame retardants, fillers, stabilizers, colorants, plasticizers, and antimicrobial agents.

[0058] Examples of the surfactant include anionic surfactants such as organic silicon compounds, sodium dodecylbenzenesulfonate, sodium laurate, polyether siloxane, phenolic compounds, etc. The content of the surfactant is 0.5 to 5.0 parts by weight relative to 100 parts by weight of the polyol.

[0059] As flame retardants, there can be listed: phosphate flame retardants such as triphenyl phosphate, tricresyl phosphate, tri(xylene) phosphate, cresyl diphenyl phosphate, trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, diethyl phenylphosphonate, dimethyl phenylphosphonate, and resorcinol diphenyl phosphate; and inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide. The amount of the flame retardant can be listed as about 3 parts by weight to about 30 parts by weight relative to 100 parts by weight of the polyol.

[0060] The polyurethane foam can be produced by either plate foaming or mold foaming.

[0061] The plate foaming is a method of mixing a polyurethane foam composition (polyurethane foam raw material) and discharging it onto a belt conveyor to foam it at atmospheric pressure and room temperature. Then, the polyurethane foam after the plate foaming is cut into a predetermined size to form a cushion pad 31.

[0062] On the other hand, mold foaming is a method in which a polyurethane foam composition (polyurethane foam raw material) is mixed and injected into a cavity of a mold (form) and foamed into the shape of the cavity. The cavity is in the shape of the cushion pad 31 .

[0063] Regarding the air permeability of polyurethane foam, the air permeability according to JIS K 6400-7:2012 is 6.0cc / cm 2 / sec or more, preferably 10cc / cm 2 / sec~150cc / cm 2 / sec. When the air permeability is less than 6.0cc / cm 2 / second, as shown in Comparative Examples 4 and 5, the integral value of the transmissibility 1 or above at the vibration frequency of 5 Hz to 10 Hz increases from 915 to 1072 and 1065, respectively, compared with Comparative Example 1, and the vibration-proof effect cannot be obtained, but the vibration-proof effect is impaired. Generally speaking, the air permeability of polyurethane foam can be controlled by mixing the blowing agent, catalyst, surfactant, and isocyanate, but the air permeability of polyurethane foam can also be controlled by adding the dicarboxylic acid ester compound having a weight average molecular weight of 500 to 5000 in the present invention.

[0064] Regarding the vibration characteristics of the polyurethane foam, the resonance magnification of the vibration test in JASO B407 is preferably 1.5 to less than 3.43, more preferably 1.7 to 3.0, and the integral value of the transmissibility 1 or more at the vibration frequency of 5Hz to 10Hz is preferably 500 to less than 915, more preferably 500 to 870. As mentioned above, when the vibration characteristics of the polyurethane foam (including the resonance magnification and the integral value of the transmissibility 1 or more at the vibration frequency of 5Hz to 10Hz that produces discomfort) are within the range, the passenger's sensitivity to discomfort can be blunted, and the riding feeling can be improved. The vibration characteristics of the polyurethane foam can be achieved by adding the above-mentioned dicarboxylic acid ester compound with a weight average molecular weight of 500 to 5000.

[0065] Regarding the hardness of the polyurethane foam, the hardness according to the JIS K 6400-2:2012 6.7D method is preferably 80N to 250N, and more preferably 90N to 180N. When the hardness is within this range, the bottoming out does not occur when sitting, and the riding feeling is good, and the touch when sitting becomes good. Generally speaking, the hardness of the polyurethane foam can be controlled by the combination of the blowing agent, the catalyst, and the isocyanate, but the hardness of the polyurethane foam can also be controlled by adding the dicarboxylic acid ester compound with a weight average molecular weight of 500 to 5000 in the present invention.

[0066] The density of the polyurethane foam (according to JIS K 7220) is preferably 30 kg / m 3 ~150kg / m 3 , more preferably 50kg / m 3 ~100kg / m 3 When the density is within this range, bottoming is not easy to occur, and the cushioning property is improved and lightened, which can help reduce the weight of the vehicle. Generally speaking, the density of the polyurethane foam can be controlled by the combination of the blowing agent, the catalyst, and the isocyanate, but the density of the polyurethane foam can also be controlled by adding the dicarboxylic acid ester compound with a weight average molecular weight of 500 to 5000 in the present invention.

[0067] The skin material 35 is formed of an appropriate material such as fabric, leather, or a synthetic resin sheet, is formed into a predetermined shape by sewing or the like, and covers the outer surface of the vehicle seat pad 40 .

[0068] [Example]

[0069] The polyurethane foams for vehicle crash pads of Examples and Comparative Examples were produced by box foaming from polyurethane foam compositions (polyurethane foam raw materials) blended with the following raw materials as shown in Table 1.

[0070]

[0071] A polyethylene film having a thickness of 0.1 mm × a height of 370 mm × a length of 370 mm × a width of 370 mm was placed in a box having a height of 300 mm × a length of 370 mm × a width of 370 mm to prepare a foaming box. The total amount of the input weight of the composition was calculated from the target density so as to obtain a height of 300 mm × a length of 370 mm × a width of 370 mm, and the ratio was calculated by dividing the input amount by the total ratio when the polyol was set to 100.

[0072] For example, since the target density of Comparative Example 1 is 55, 1691 g is required as the total amount of input weight to obtain the specified volume. Since the total ratio is 103, the ratio is 13 times. Materials other than isocyanate are measured and added into a 3-liter polypropylene container using a measuring instrument, and premixed for 20 seconds using a mixer that rotates continuously at 1720 RPM, and then isocyanate is added, mixed for 5 seconds, and quickly added into a foaming box for foaming.

[0073] ■Polyol: Polyether polyol, molecular weight: 3000, number of functional groups: 3, hydroxyl value: 56.1 mgKOH / g, ethylene oxide content 8%, product name: GP-3050NS, manufactured by Sanyo Chemical Industries, Ltd.

[0074] ■Additive 1: diisononyl adipate, weight average molecular weight: 400, melting point: -68°C, OH value: 0, product name: DINA, manufactured by Daihachi Chemical Industry Co., Ltd.

[0075] ■Additive 2: dimer acid polyester polyol, weight average molecular weight: 2500, number of functional groups: 3.31, melting point: less than -20°C, OH value: 74.4, product name: T2458, manufactured by Hitachi Chemical Polymer Co., Ltd.

[0076] ■Additive 3: Grease, freezing point: -12.5°C, product name: FPL-32, manufactured by MORESCO

[0077] ■Additive 4: Isocetyl stearate, weight average molecular weight: 509, number of functional groups: 0, melting point: below 0°C, OH value: 0, product name: Isocetyl stearate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.

[0078] ■Additive 5: Distearyl dimer ester, weight average molecular weight: 900, number of functional groups: 0.16, melting point: 25°C, OH value: 10, manufactured by INOAC

[0079] ■Additive 6: Dilauryl dimer ester, weight average molecular weight: 815, number of functional groups: 0.15, melting point: 23°C, OH value: 10, manufactured by INOAC

[0080] ■ Foaming agent: water

[0081] ■Amine catalyst: Product name: DABCO33LSI, manufactured by Air Products Japan

[0082] ■Surfactant: Silicone surfactant, product name: Tegostab B8239, manufactured by Evonik

[0083] ■Tin catalyst: Tin octylate, product name: MRH-110, manufactured by Johoku Chemical Industry Co., Ltd.

[0084] ■Isocyanate 1: TDI containing 2,4-TDI and 2,6-TDI in a ratio of 80:20, product name: T-80, manufactured by Nippon Polyurethane Industry Co., Ltd.

[0085] ■ Isocyanate 2: TDI containing 4-TDI and 2,6-TDI in a ratio of 67:33, product name: T-67, manufactured by Nippon Polyurethane Industry Co., Ltd.

[0086] <Method for synthesizing distearyl dimer acid ester>

[0087] 2 moles of stearyl alcohol were added to 1 mole of dimer acid. 0.1 parts by weight of titanium tetraisopropoxide as a catalyst was added to 100 parts by weight of dimer acid and stearyl alcohol, and a dehydration esterification reaction was carried out at 120° C. to 180° C. for 16 hours while allowing condensation water to flow out. The residual stearyl alcohol was removed by heating and reducing pressure, and then activated clay was added to the reaction product, stirred for 1 hour, and then unreacted products were removed by filtration to obtain dimer acid distearyl ester.

[0088] <Method for synthesizing dilauryl dimer acid ester>

[0089] 2 moles of lauryl alcohol were added to 1 mole of dimer acid. 0.1 parts by weight of titanium tetraisopropoxide as a catalyst was added to 100 parts by weight of dimer acid and stearyl alcohol, and a dehydration esterification reaction was carried out at 120°C to 180°C for 16 hours while allowing condensation water to flow out. The residual lauryl alcohol was removed by heating and reducing pressure, and then activated clay was added to the reaction product, stirred for 1 hour, and then unreacted products were removed by filtration to obtain dimer acid dilauryl ester.

[0090] The polyurethane foams of the examples and comparative examples were evaluated for density, hardness, rebound resilience, air permeability, vibration test, and foaming moldability. The measurement methods are shown below. In addition, the measurement results are shown in Table 1.

[0091] Density (kg / m 3 ) was measured according to JIS K 7222.

[0092] The hardness (N) was measured on a measurement sample of 250 mm×250 mm×50 mm in accordance with JIS K 6400-2:2012 6.7 D method.

[0093] The rebound resilience (%) was measured based on JIS K 6400-3:2011 using a measurement sample of 250 mm×250 mm×50 mm.

[0094] About air permeability (cc / cm 2 / sec), and was measured on a measurement sample of 200 mm × 200 mm × 10 mm in accordance with JIS K 6400-7:2012.

[0095] Regarding the vibration test, the resonance frequency (Hz), resonance magnification, and the integral value of the transmissibility above 1 at the vibration frequency of 5Hz to 10Hz are measured for the measurement sample of 250mm×250mm×50mm according to JASO B407. The resonance frequency (Hz) is the frequency when the transmissibility is at the peak value, and the resonance magnification is the highest transmissibility. It should be noted that the integral value of the transmissibility above 1 at the vibration frequency of 5Hz to 10Hz is the value obtained by integrating the transmissibility above 1 at the vibration frequency of 5Hz to 10Hz that causes discomfort when the seat vibrates up and down, that is, the total value. The integration starts from 5Hz, where the discomfort of the up and down vibration begins to be felt. Since the transmissibility becomes less than 1 when it exceeds 10Hz, the integration ends at 10Hz. By calculating the integral value of the transmissibility above 1 from 5Hz to 10Hz, the discomfort imparted to the human body can be quantified.

[0096] Regarding the foaming moldability, when the polyurethane foam can be molded well without any defect, it is evaluated as “⊚”, and when there is foaming defect such as shrinkage or crack, it is evaluated as “×”.

[0097] The configuration and measurement results of each example and each comparative example are described.

[0098] ■Example 1

[0099] Example 1 is an example as follows: the polyol is set to 100 parts by weight, the additive 5 (distearyl dimer acid, manufactured by INOAC) is set to 10 parts by weight, the foaming agent (water) is set to 1.85 parts by weight, the amine catalyst is set to 0.25 parts by weight, the surfactant is set to 0.27 parts by weight, the tin catalyst is set to 0.296 parts by weight, the isocyanate 1 (T-80) is set to 8.3 parts by weight, the isocyanate 2 (T-67) is set to 18.7 parts by weight, and the isocyanate index is set to 105.

[0100] The density of the polyurethane foam of Example 1 is 55.5 kg / m3 , hardness is 146N, resilience is 52.3%, air permeability is 90cc / cm 2 / sec, the resonance frequency was 4.00 Hz, the resonance magnification was 3.05, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 866, and the foaming moldability was "◎".

[0101] Since the air permeability of the polyurethane foam of Example 1 is 6cc / cm 2 / sec or more, the resonance magnification according to the vibration test of JASO B407 is in the range of 1.5 to less than 3.43, and the integral value of the transmissibility 1 or more at the vibration frequency of 5Hz to 10Hz is in the range of 500 to less than 915, so the discomfort caused by the vibration when the vehicle is running is small and the riding feeling is good. In addition, since the hardness is in the range of 80N to 250N, the bottoming out when sitting can be suppressed, and the riding feeling can be made good.

[0102] ■Example 2

[0103] Example 2 is the same as Example 1 except that 10 parts by weight of Additive 2 (dimer acid polyester polyol, product name: T2458) was added instead of Additive 5 (dimer acid distearyl ester, manufactured by INOAC) in Example 1.

[0104] The density of the polyurethane foam of Example 2 is 53.6 kg / m 3 , hardness is 180N, resilience is 44.4%, air permeability is 116.7cc / cm 2 / sec, the resonance frequency was 5.00 Hz, the resonance magnification was 2.04, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 749, and the foaming moldability was "◎".

[0105] The air permeability of the polyurethane foam of Example 2 is 6cc / cm 2 / sec or more, the resonance magnification according to the vibration test of JASO B407 is in the range of 1.5 to less than 3.43, and the integral value of the transmissibility 1 or more at the vibration frequency of 5Hz to 10Hz is in the range of 500 to less than 915, so the discomfort caused by the vibration when the vehicle is running is small and the riding feeling is good. In addition, since the hardness is in the range of 80N to 250N, the bottoming out when sitting can be suppressed, and the riding feeling can be made good.

[0106] ■Example 3

[0107] Example 3 is the same as Example 2 except that the amount of the additive 2 (dimer acid polyester polyol, product name: T2458) in Example 2 was 20 parts by weight.

[0108] The density of the polyurethane foam of Example 3 is 58.7 kg / m 3 , hardness is 174N, resilience is 37.5%, air permeability is 123.7cc / cm 2 / second, the resonance frequency was 4.93 Hz, the resonance magnification was 1.75, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 869, and the foaming moldability was "◎".

[0109] The air permeability of the polyurethane foam of Example 3 is 6cc / cm 2 / sec or more, the resonance magnification according to the vibration test of JASO B407 is in the range of 1.5 to less than 3.43, and the integral value of the transmissibility 1 or more at the vibration frequency of 5Hz to 10Hz is in the range of 500 to less than 915, so the discomfort caused by the vibration when the vehicle is running is small and the riding feeling is good. In addition, since the hardness is in the range of 80N to 250N, the bottoming out when sitting can be suppressed, and the riding feeling can be made good.

[0110] ■Example 4

[0111] Example 4 is the same as Example 1 except that the amount of the additive 5 (distearyl dimer acid ester, manufactured by INOAC) in Example 1 was 100 parts by weight.

[0112] The density of the polyurethane foam of Example 4 is 108.1 kg / m 3 , hardness is 92N, resilience is 29%, air permeability is 10.2cc / cm 2 / second, the resonance frequency was 5.66 Hz, the resonance magnification was 1.76, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 507, and the foaming moldability was "◎".

[0113] The air permeability of the polyurethane foam of Example 4 is 6cc / cm 2 / sec or more, the resonance magnification according to the vibration test of JASO B407 is in the range of 1.5 to less than 3.43, and the integral value of the transmissibility 1 or more at the vibration frequency of 5Hz to 10Hz is in the range of 500 to less than 915, so the discomfort caused by the vibration when the vehicle is running is small and the riding feeling is good. In addition, since the hardness is in the range of 80N to 250N, the bottoming out when sitting can be suppressed, and the riding feeling can be made good.

[0114] ■Example 5

[0115] Example 5 is the same as Example 1 except that 10 parts by weight of Additive 6 (dilauryl dimer acid ester, manufactured by INOAC) is added instead of Additive 5 (distearyl dimer acid ester, manufactured by INOAC) in Example 1.

[0116] The density of the polyurethane foam of Example 5 is 54.3 kg / m 3 , hardness is 143N, resilience is 53.2%, air permeability is 92.1cc / cm 2 / second, the resonance frequency was 4.12 Hz, the resonance magnification was 2.98, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 855, and the foaming moldability was "◎".

[0117] The air permeability of the polyurethane foam of Example 5 is 6cc / cm 2 / sec or more, the resonance magnification according to the vibration test of JASO B407 is in the range of 1.5 to less than 3.43, and the integral value of the transmissibility 1 or more at the vibration frequency of 5Hz to 10Hz is in the range of 500 to less than 915, so the discomfort caused by the vibration when the vehicle is running is small and the riding feeling is good. In addition, since the hardness is in the range of 80N to 250N, the bottoming out when sitting can be suppressed, and the riding feeling can be made good.

[0118] ■Comparative Example 1

[0119] Comparative Example 1 is an example in which any of Additives 1 to 5 is not included and the isocyanate index is set to 100. The other parts are the same as Examples 1 to 4.

[0120] The density of the polyurethane foam of Comparative Example 1 is 50.3 kg / m 3 , hardness is 144N, resilience is 53.7%, air permeability is 118cc / cm 2 / second, the resonance frequency was 3.96 Hz, the resonance magnification was 3.43, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 915, and the foaming moldability was "◎".

[0121] Since the resonance magnification of the polyurethane foam of Comparative Example 1 in the vibration test according to JASO B407 exceeds the range of 1.5 to less than 3.43, and the integral value of the transmissibility above 1 at the vibration frequency of 5 Hz to 10 Hz exceeds the range of 500 to less than 915, the discomfort caused by the vibration is great and a good riding feeling cannot be obtained.

[0122] ■Comparative Example 2

[0123] Comparative Example 2 is an example similar to Comparative Example 1 except that 10 parts by weight of Additive 1 (diisononyl adipate, product name: DINA) is added. Other details are the same as those of Comparative Example 1.

[0124] The density of the polyurethane foam of Comparative Example 2 is 57.4 kg / m 3 , hardness is 120N, resilience is 55.6%, air permeability is 90.8cc / cm 2 / second, the resonance frequency was 4.65 Hz, the resonance magnification was 3.53, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 964, and the foaming moldability was "◎".

[0125] Since the resonance magnification of the polyurethane foam of Comparative Example 2 in the vibration test according to JASO B407 exceeds the range of 1.5 to less than 3.43, and the integrated value of the transmissibility above 1 at the vibration frequency of 5 Hz to 10 Hz exceeds the range of 500 to less than 915, the discomfort caused by the vibration is great and a good riding feeling cannot be obtained.

[0126] ■Comparative Example 3

[0127] Comparative Example 3 was the same as Comparative Example 2 except that 20 parts by weight of Additive 1 (diisononyl adipate, product name: DINA) was added and the isocyanate index was set to 105.

[0128] The density of the polyurethane foam of Comparative Example 3 is 70.7 kg / m 3 , hardness is 127N, resilience is 53.6%, air permeability is 35cc / cm 2 / sec, the resonance frequency was 5.10 Hz, the resonance magnification was 3.22, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 991, and the foaming moldability was "◎".

[0129] In the vibration test according to JASO B407, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz of the polyurethane foam of Comparative Example 3 was outside the range of 500 to less than 915, so the discomfort due to vibration was great and a good riding feeling could not be obtained.

[0130] ■Comparative Example 4

[0131] Comparative Example 4 was the same as Comparative Example 1 except that 10 parts by weight of Additive 3 (grease, product name: FPL-32) was added.

[0132] The density of the polyurethane foam of Comparative Example 4 is 52.9 kg / m 3 , hardness is 117N, resilience is 25.5%, air permeability is 3.2cc / cm 2 / second, the resonance frequency was 8.69 Hz, the resonance magnification was 2.32, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 1072, and the foaming moldability was "◎".

[0133] Since the integral value of the transmissibility 1 or above at a vibration frequency of 5 Hz to 10 Hz in the vibration test according to JASO B407 of the polyurethane foam of Comparative Example 4 exceeds the range of 500 to less than 915, the discomfort caused by vibration is great and a good riding feeling cannot be obtained.

[0134] ■Comparative Example 5

[0135] Comparative Example 5 was the same as Comparative Example 4 except that 20 parts by weight of Additive 3 (grease, product name: FPL-32) was added.

[0136] The density of the polyurethane foam of Comparative Example 5 is 54.2 kg / m 3 , hardness is 109N, resilience is 43%, air permeability is 0.1cc / cm 2 / second, the resonance frequency was 9.07 Hz, the resonance magnification was 2.48, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 1065, and the foaming moldability was "◎".

[0137] In the vibration test according to JASO B407, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz of the polyurethane foam of Comparative Example 5 was outside the range of 500 to less than 915, so the discomfort due to vibration was great and a good riding feeling could not be obtained.

[0138] ■Comparative Example 6

[0139] Comparative Example 6 was the same as Comparative Example 1 except that 10 parts by weight of Additive 4 (isohexadecyl stearate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) was added.

[0140] The density of the polyurethane foam of Comparative Example 6 is 59.6 kg / m 3 , hardness is 128N, resilience is 55%, air permeability is 137cc / cm 2 / sec, the resonance frequency was 4.0 Hz, the resonance magnification was 3.8, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 623, and the foaming moldability was "◎".

[0141] Since the resonance magnification of the polyurethane foam of Comparative Example 6 in the vibration test according to JASO B407 is outside the range of 1.5 to less than 3.43, the discomfort caused by vibration is large and a good riding feeling cannot be obtained.

[0142] ■Comparative Example 7

[0143] Comparative Example 7 was the same as Comparative Example 6 except that 20 parts by weight of Additive 4 (product name: isocetyl stearate, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) was added.

[0144] The density of the polyurethane foam of Comparative Example 6 is 74.3 kg / m 3 , hardness is 110N, resilience is 54%, air permeability is 14.5cc / cm 2 / sec, the resonance frequency was 4.9 Hz, the resonance magnification was 3.1, the integral value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz was 785.1, and the foaming moldability was "×".

[0145] The polyurethane foam of Comparative Example 7 was in a foamed state, and a good foam that could be used as a cushion pad could not be obtained.

[0146] As described above, the vehicle cushion pad and the vehicle seat pad of the present invention can reduce the discomfort caused by vibration during vehicle running and provide a good riding feeling.

Claims

1. A vehicle cushion, comprising a polyurethane foam, characterized in that: The polyurethane foam is formed from a polyurethane foam composition comprising polyol, isocyanate, a catalyst, a blowing agent and additives. The additive is a dicarboxylic acid ester compound with a weight average molecular weight of 500 to 5000. The air permeability of the polyurethane foam according to JIS K 6400-7:2012 is 6.0 cc / cm 2 / second or more.

2. The vehicle cushion according to claim 1, wherein: The resonance magnification of the polyurethane foam according to the vibration test of JASO B407 is 1.5 to less than 3.43, and The integrated value of the transmissibility 1 or more at the vibration frequency of 5 Hz to 10 Hz is 500 to less than 915.

3. The vehicle cushion according to claim 1 or 2, characterized in that: The polyurethane foam has a hardness of 80N to 250N according to JIS K6400-2:2012 6.7D method.

4. The vehicle crash pad according to any one of claims 1 to 3, wherein: The dicarboxylic acid ester compound having a weight average molecular weight of 500 to 5000 has a melting point of above -20°C.

5. The vehicle crash pad according to any one of claims 1 to 3, wherein The air permeability is 10cc / cm 2 / sec~150cc / cm 2 / Second.

6. The vehicle crash pad according to any one of claims 1 to 3, wherein The isocyanate is toluene diisocyanate.

7. A seat cushion for a vehicle, wherein: The cushion pad according to any one of claims 1 to 4 is stacked on a seat cushion main body.

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