Vehicle buffer and vehicle seat cushion

Abstract

The present invention provides a vehicle cushion and a vehicle seat cushion. The vehicle cushion includes a polyurethane foam. It is characterized in that the polyurethane foam is formed from a polyurethane foam composition, the polyurethane foam composition includes a polyol, an isocyanate, a catalyst, a foaming agent and an additive, the additive is a dicarboxylic acid ester compound with 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<supgt;2< / supgt> / second or more; the vehicle seat cushion includes a seat cushion main body and the vehicle cushion laminated on the seat cushion main body.

Description

Technical Field

[0001] The present invention relates to a vehicle cushion and a vehicle seat obtained by mounting the vehicle cushion on a seat cushion main body. Background Art

[0002] Conventionally, in order to improve the sitting comfort, there is a vehicle seat obtained by mounting a cushion on a seat cushion main body.

[0003] For example, in Patent Document 1, there is a vehicle seat obtained by laminating a soft plate-shaped polyurethane foam on a mold pad (Patent Document 1).

[0004] Prior Art Documents

[0005] Patent Documents

[0006] [Patent Document 1] Japanese Patent No. 4393453 Gazette Summary of the Invention

[0007] Problems to be Solved by the Invention

[0008] However, for conventional vehicle seats, it is desired to reduce the discomfort caused by vibrations during vehicle travel.

[0009] The present invention has been made in view of the above aspects, and an object thereof is to provide a vehicle cushion that reduces the discomfort caused by vibrations during vehicle travel and a vehicle seat obtained by mounting the vehicle cushion on a seat cushion main body.

[0010] Means for Solving the Problems

[0011] The means of the present invention for solving the above problems and achieving the object are shown below.

[0012] (1) A vehicle cushion made of a polyurethane foam, characterized in that the polyurethane foam is formed from a polyurethane foam composition containing a polyol, an isocyanate, a catalyst, a foaming agent, and an additive, the additive being 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 being 6.0 cc / cm 2 / second or more.

[0013] (2) The vehicle cushion according to (1), characterized in that the resonance magnification of the polyurethane foam in the vibration test according to JASO B407 is 1.5 to less than 3.43, and the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz is 500 to less than 915.

[0014] (3) The cushion for vehicle according to (1) or (2), characterized in that the hardness of the polyurethane foam according to JIS K 6400-2:2012 6.7D method is 80N to 250N.

[0015] (4) The cushion for vehicle according to any one of (1) to (3), characterized in that the melting point of the dicarboxylic acid ester compound having a weight average molecular weight of 500 to 5000 is -20°C or higher.

[0016] (5) The cushion for vehicle according to any one of (1) to (4), characterized in that the density of the polyurethane foam according to JIS K 7220 is 30 kg / m 3 ~150 kg / m 3 .

[0017] (6) A seat cushion for vehicle, comprising: a seat cushion main body; and the cushion according to any one of (1) to (5) laminated on the seat cushion main body.

[0018] Advantages of the Invention

[0019] 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 the vibration during vehicle driving.

[0020] Regarding the vibration riding feeling performance of the seat cushion, according to British Standard 6841 (BS6841), the discomfort for the up and down vibration of the seat is most sensitive at a frequency of 5 Hz to 16 Hz, and the sensitivity of the discomfort decreases as the frequency band is away from this.

[0021] 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 becomes dull. In addition, since the integral value of the transmissibility of 1 or more at the vibration frequency of 5 Hz to 10 Hz where discomfort is felt is as low as 500 to less than 915, the discomfort felt is reduced and the riding feeling becomes good.

[0022] 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, thereby being able to suppress bottoming out when sitting and making the riding feeling good.

[0023] 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 feeling when sitting can be made good.

[0024] 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 to 150 kg / m 3 , so that bottoming is less likely to occur. In addition, the cushioning property is improved and the weight is reduced, which can contribute to the weight reduction of the vehicle.

[0025] According to the sixth aspect of the present invention, the vehicle seat cushion obtained by laminating the cushion pad of the present invention on the seat cushion main body can reduce the discomfort caused by the vibration during vehicle driving through the effect of the cushion pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional view of an embodiment of a vehicle seat obtained by placing the cushion pad of the present invention on the seat cushion.

[0027] SYMBOL DESCRIPTION

[0028] 10 Vehicle seat

[0029] 11 Seat frame

[0030] 21 Seat cushion main body

[0031] 31 Cushion pad

[0032] 35 Skin material

[0033] 40 Vehicle seat cushion DETAILED DESCRIPTION OF THE INVENTION

[0034] Hereinafter, an embodiment of the vehicle cushion pad and the vehicle seat cushion of the present invention will be described using Figure 1 the vehicle seat 10 shown.

[0035] Figure 1 The vehicle seat 10 shown includes a seat frame 11, a seat cushion main body 21, a cushion pad 31, and a skin material 35.

[0036] The cushion pad 31 includes the vehicle cushion pad of the present invention, and the seat cushion main body 21 and the cushion pad 31 constitute the vehicle seat cushion 40 of the present invention.

[0037] It should be noted that Figure 1 only the seat portion side is shown, and the backrest side is omitted. In addition, in the case of a temperature-adjustable seat cushion, a heater (not shown) is disposed on the cushion pad 31, and each heater is covered with the skin material 35.

[0038] ​The seat frame 11 supports the vehicle seat and is fixed inside the vehicle compartment. In addition, the seat frame 11 is made of a high-rigidity material such as metal and has a structure corresponding to the vehicle type, etc.

[0039] The seat cushion main body 21 includes an elastic foam such as a polyurethane foam. Compared with the buffer pad 31, the seat cushion main body 21 has a higher hardness and a smaller reduction in elastic recovery force due to long-term use, enabling it to support the weight of the passenger. As a preferred seat cushion main body 21, it preferably has a hardness (JIS K 6400-2:2012 6.7D method) of 80 N to 250 N and a density (JIS K 7222) of 30 kg / m 3 ~150 kg / m 3 、more preferably 50 kg / m 3 ~100 kg / m 3 、and a polyurethane foam having a resilience (JIS K 6400-3:2011) of 25% to 55%.

[0040] In addition, in order to improve the support for the buttocks of the sitter, the left and right side portions of the upper surface of the illustrated seat cushion main body 21 bulge, and the central portion is lowered. The buffer pad 31 is placed on the lowered central portion.

[0041] The buffer pad (the vehicle buffer pad of the present invention) 31 is formed from a polyurethane foam composition (urethane foam raw material) containing a polyol, an isocyanate, a catalyst, a foaming agent, and an additive.

[0042] As the polyol, a polyol for polyurethane foam can be used, for example, any one of polyether polyols, polyester polyols, polyether ester polyols, etc., and one or more of them can be used.

[0043] As the polyether polyol, for example, the following polyether polyols can be listed. The polyether polyol is obtained by adding an alkylene oxide such as ethylene oxide (EO) and propylene oxide (PO) to a polyol such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, and sucrose.

[0044] As the polyester polyol, for example, polyester polyols obtained by polycondensing 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 can be listed.

[0045] In addition, as the polyether ester polyol, a polyether ester polyol obtained by reacting the polyether polyol with a polybasic acid to form a polyester, or a polyether ester polyol having both a polyether and a polyester segment in one molecule can be listed.

[0046] Regarding polyols, it is preferred to use alone or use a variety of polyols with a hydroxyl value (OHV) of 30 mg KOH / g to 300 mg KOH / g, a functional group number of 2 to 4, a molecular weight Mw preferably of 500 to 7000, and more preferably a molecular weight Mw of 2000 to 6000.

[0047] As the isocyanate, aliphatic or aromatic polyisocyanates having two or more isocyanate groups, mixtures thereof, and modified polyisocyanates obtained by modifying them can be used. As aliphatic polyisocyanates, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, etc. can be cited. As aromatic polyisocyanates, toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate, xylylene diisocyanate, polymeric MDI (crude MDI), etc. can be cited. It should be noted that prepolymers having an isocyanate group at the end obtained by reacting a polyol with an excess of polyisocyanate can also be used.

[0048] 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].

[0049] As the catalyst, known catalysts for polyurethane foams can be used. For example, amine catalysts such as triethylamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, N-ethylmorpholine, tetramethylguanidine, etc.; tin catalysts such as stannous octoate, dibutyltin dilaurate, etc.; metal catalysts (also called organometallic catalysts) such as phenylmercuric propionate or lead octenoate. The total amount of the catalyst is preferably about 0.1 part by weight to about 2 parts by weight relative to 100 parts by weight of the polyol.

[0050] As the blowing agent, water, alternative Freons, 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 the polyisocyanate, and the polyurethane foam is foamed using this carbon dioxide gas. The amount of water as the blowing agent is preferably about 1 part by weight to about 6 parts by weight relative to 100 parts by weight of the polyol. In addition, when other blowing agents are used in combination with water, the amount of the other blowing agent can be appropriately determined.

[0051] 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 moiety can be not only carbon but also a hydroxyl group or an amino group.

[0052] When the weight-average molecular weight of the dicarboxylic acid ester compound is less than 500, the integral value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz in the vibration test increases, and the effect of reducing discomfort caused by vibration becomes smaller. 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 with a good foaming state that can be used as a cushion cannot be obtained.

[0053] In addition, the melting point of the dicarboxylic acid ester compound having a weight-average molecular weight of 500 to 5000 is preferably -20°C or higher, more preferably 0°C or higher, and further preferably 25°C or higher. The dicarboxylic acid ester 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.

[0054] With respect to 100 parts by weight of the polyol, 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 parts by weight to about 150 parts by weight, more preferably 10 parts by weight to 100 parts by weight. When it is less than 5 parts by weight, the effect of reducing discomfort caused by vibration becomes smaller. On the other hand, when it is greater than 150 parts by weight, a polyurethane foam with a good foaming state that can be used as a cushion cannot be obtained.

[0055] Examples of the dicarboxylic acid ester compound having a weight-average molecular weight of 500 to 5000 that can be used in the present invention include distearyl dimerate (weight-average molecular weight: 900, melting point: 23°C, OH value: 10), dilauryl dimerate (weight-average molecular weight: 815, melting point: 23°C, OH value: 10), polyester polyol dimerate (weight-average molecular weight: 2500, melting point: less than -20°C, OH value: 74.4), and the like.

[0056] Examples of other main components that can be appropriately incorporated into the polyurethane foam composition include surfactants, flame retardants, fillers, stabilizers, colorants, plasticizers, antibacterial agents, and the like.

[0057] Examples of the surfactant include silicone compounds, anionic surfactants such as sodium dodecylbenzenesulfonate and sodium laurate, polyether siloxanes, phenolic compounds, and the like. The content of the surfactant is exemplified as 0.5 parts by weight to 5.0 parts by weight with respect to 100 parts by weight of the polyol.

[0058] Examples of the flame retardant include phosphate flame retardants such as triphenyl phosphate, tricresyl phosphate, tris(xylenyl) phosphate, tolyldiphenyl 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. Regarding the amount of the flame retardant, it may be about 3 parts by weight to about 30 parts by weight relative to 100 parts by weight of the polyol.

[0059] The production of the polyurethane foam can be either slab foaming or mold foaming.

[0060] Slab foaming is a method in which a polyurethane foam composition (raw material for polyurethane foam) is mixed and discharged onto a belt conveyor, and foamed under atmospheric pressure and at room temperature. Then, the polyurethane foam after slab foaming is cut into a predetermined size to produce the cushion 31.

[0061] On the other hand, mold foaming is a method in which a polyurethane foam composition (raw material for polyurethane foam) is mixed and injected into the cavity of a mold (die) and foamed into the shape of the cavity. The cavity is in the shape of the cushion 31.

[0062] Regarding the air permeability of the polyurethane foam, the air permeability according to JIS K 6400-7:2012 is 6.0 cc / cm 2 / s or more, preferably 10 cc / cm 2 / s to 150 cc / cm 2 / s. When the air permeability is less than 6.0 cc / cm 2 / s, compared with Comparative Example 1, as shown in Comparative Examples 4 and 5, the integral value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz increases from 915 to 1072 and 1065, and the anti-vibration effect cannot be obtained, but instead the anti-vibration effect is impaired. Generally, the air permeability of the polyurethane foam can be controlled by the combination of a blowing agent, a catalyst, a surfactant, and an isocyanate, but the air permeability of the 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.

[0063] 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 said 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.

[0064] 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.

[0065] 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 less likely to occur, and the cushioning properties are improved and the weight is reduced, which can help reduce the weight of the vehicle. Generally speaking, the density of the polyurethane foam can be controlled by combining a blowing agent, a catalyst, and an isocyanate, but the density of the polyurethane foam can also be controlled by adding the above-mentioned dicarboxylic acid ester compound with a weight average molecular weight of 500 to 5000 in the present invention.

[0066] 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 .

[0067] [Example]

[0068] 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.

[0069]

[0070] A polyethylene film with 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 with a height of 300 mm × a length of 370 mm × a width of 370 mm to make a foaming box. The total 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.

[0071] For example, since the target density of Comparative Example 1 was 55, in order to obtain a specified volume, as the total input weight, 1691 g had to be input. Since the total ratio was 103, the composition was carried out at a ratio of 13 times. Using a measuring instrument, materials other than isocyanate were metered into a 3-liter polypropylene container, pre-mixed for 20 seconds using a mixer continuously rotating at 1720 RPM, then isocyanate was added and mixed for 5 seconds, and quickly put into the foaming box for foaming formation.

[0072] ■ 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.

[0073] ■ 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.

[0074] ■ 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.

[0075] ■ Additive 3: Grease, freezing point: -12.5 °C, product name: FPL-32, manufactured by MORESCO Corporation

[0076] ■ Additive 4: Isocetyl stearate, weight-average molecular weight: 509, number of functional groups: 0, melting point: 0 °C or below, OH value: 0, product name: Isocetyl stearate, manufactured by Fujifilm Wako Pure Chemical Corporation

[0077] ■ Additive 5: Dimer acid distearyl ester, weight-average molecular weight: 900, number of functional groups: 0.16, melting point: 25 °C, OH value: 10, manufactured by INOAC Corporation

[0078] ■ Additive 6: Dimer acid dilauryl ester, weight-average molecular weight: 815, number of functional groups: 0.15, melting point: 23 °C, OH value: 10, manufactured by INOAC Corporation

[0079] ■Blowing agent: water

[0080] ■Amine catalyst: Product name: DABCO 33 LSI, manufactured by Air Products Japan Co., Ltd.

[0081] ■Surfactant: Silicone surfactant, Product name: Tegostab B8239, manufactured by Evonik

[0082] ■Tin catalyst: Stannous octanoate, Product name: MRH-110, manufactured by Johoku Chemical Industry Co., Ltd.

[0083] ■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.

[0084] ■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.

[0085] <Synthesis method of distearyl dimerate>

[0086] Add 2 moles of stearyl alcohol to 1 mole of dimer acid. With respect to 100 parts by weight of dimer acid and stearyl alcohol, add 0.1 part by weight of titanium tetraisopropoxide as a catalyst, and carry out a dehydration esterification reaction for 16 hours at 120 °C to 180 °C while allowing the condensed water to flow out. Remove the remaining stearyl alcohol by heating under reduced pressure, then add activated clay to the reaction product, stir for 1 hour, and then remove the unreacted substances by filtration to obtain distearyl dimerate.

[0087] <Synthesis method of dilauryl dimerate>

[0088] Add 2 moles of lauryl alcohol to 1 mole of dimer acid. With respect to 100 parts by weight of dimer acid and lauryl alcohol, add 0.1 part by weight of titanium tetraisopropoxide as a catalyst, and carry out a dehydration esterification reaction for 16 hours at 120 °C to 180 °C while allowing the condensed water to flow out. Remove the remaining lauryl alcohol by heating under reduced pressure, then add activated clay to the reaction product, stir for 1 hour, and then remove the unreacted substances by filtration to obtain dilauryl dimerate.

[0089] For the polyurethane foams of the examples and comparative examples, the density, hardness, resilience, air permeability, measurement of vibration test, and foam molding properties were judged. The measurement methods are shown below. In addition, the measurement results are shown in Table 1.

[0090] Density (kg / m 3 ) was measured according to JIS K 7222.

[0091] Regarding hardness (N), a measurement sample of 250 mm × 250 mm × 50 mm was measured according to the method of JIS K 6400-2:2012, 6.7D.

[0092] Regarding resilience (%) a measurement sample of 250 mm × 250 mm × 50 mm was measured according to JIS K 6400-3:2011.

[0093] Regarding air permeability (cc / cm 2 / sec), a measurement sample of 200 mm × 200 mm × 10 mm was measured according to JIS K 6400-7:2012.

[0094] Regarding the vibration test, according to JASO B407, the resonance frequency (Hz), resonance magnification, and the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz were measured for a measurement sample of 250 mm × 250 mm × 50 mm. The resonance frequency (Hz) is the frequency at which the transmissibility is at its peak, and the resonance magnification is the highest transmissibility. It should be noted that the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz is the value obtained by integrating the transmissibility of 1 or more at the vibration frequencies of 5 Hz to 10 Hz that cause discomfort during the up-and-down vibration of the seat, that is, the total value. The integration starts from 5 Hz where the discomfort of the up-and-down vibration is first felt, and since the transmissibility becomes less than 1 when it exceeds 10 Hz, the integration is carried out up to 10 Hz. By obtaining the integrated value of the transmissibility of 1 or more from 5 Hz to 10 Hz, the discomfort level imparted to the human body can be numerically expressed.

[0095] Regarding foam moldability, it is evaluated as "◎" when the polyurethane foam can be molded well without any defects, and as "×" when there are foam defects such as shrinkage or rupture.

[0096] The configurations and measurement results of each example and each comparative example are described.

[0097] ■ Example 1

[0098] Example 1 is as follows: 100 parts by weight of polyol, 10 parts by weight of additive 5 (dimer acid distearyl ester, manufactured by INOAC Corporation), 1.85 parts by weight of foaming agent (water), 0.25 parts by weight of amine catalyst, 0.27 parts by weight of surfactant, 0.296 parts by weight of tin catalyst, 8.3 parts by weight of isocyanate 1 (T-80), 18.7 parts by weight of isocyanate 2 (T-67), and an isocyanate index of 105.

[0099] The density of the polyurethane foam of Example 1 was 55.5 kg / m3 , with a hardness of 146 N, a resilience of 52.3%, an air permeability of 90 cc / cm 2 / sec, a resonance frequency of 4.00 Hz, a resonance magnification of 3.05, an integrated value of the transmissibility above 1 in the vibration frequency range of 5 Hz to 10 Hz of 866, and a foam molding property of "◎".

[0100] Since the air permeability of the polyurethane foam of Example 1 is 6 cc / cm 2 / sec or more, the resonance magnification in the vibration test according to JASO B407 is in the range of 1.5 to less than 3.43, and the integrated value of the transmissibility above 1 in the vibration frequency range of 5 Hz to 10 Hz is in the range of 500 to less than 915. Therefore, the discomfort caused by the vibration during vehicle driving is small and the seating feeling is good. In addition, since the hardness is in the range of 80 N to 250 N, bottoming during seating can be suppressed and the seating feeling can be made good.

[0101] ■Example 2

[0102] Regarding Example 2, instead of additive 5 (dimer acid distearyl ester, manufactured by INOAC Corporation) in Example 1, 10 parts by weight of additive 2 (dimer acid polyester polyol, product name: T2458) was added. Other than this, it is the same example as Example 1.

[0103] The density of the polyurethane foam of Example 2 is 53.6 kg / m 3 , with a hardness of 180 N, a resilience of 44.4%, an air permeability of 116.7 cc / cm 2 / sec, a resonance frequency of 5.00 Hz, a resonance magnification of 2.04, an integrated value of the transmissibility above 1 in the vibration frequency range of 5 Hz to 10 Hz of 749, and a foam molding property of "◎".

[0104] The air permeability of the polyurethane foam of Example 2 is 6 cc / cm 2 / sec or more, the resonance magnification in the vibration test according to JASO B407 is in the range of 1.5 to less than 3.43, and the integrated value of the transmissibility above 1 in the vibration frequency range of 5 Hz to 10 Hz is in the range of 500 to less than 915. Therefore, the discomfort caused by the vibration during vehicle driving is small and the seating feeling is good. In addition, since the hardness is in the range of 80 N to 250 N, bottoming during seating can be suppressed and the seating feeling can be made good.

[0105] ■Example 3

[0106] Regarding Example 3, except that the amount of additive 2 (dimer acid polyester polyol, product name: T2458) in Example 2 was set to 20 parts by weight, it is the same example as Example 2.

[0107] The density of the polyurethane foam of Example 3 is 58.7 kg / m 3 , the hardness is 174 N, the resilience is 37.5%, the air permeability is 123.7 cc / cm 2 / second, the resonance frequency is 4.93 Hz, the resonance magnification is 1.75, the integrated value of the transmissibility above 1 at the vibration frequency of 5 Hz to 10 Hz is 869, and the foam molding property is "◎".

[0108] The air permeability of the polyurethane foam of Example 3 is 6 cc / cm 2 / second or more, the resonance magnification in the vibration test according to JASO B407 is in 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 is in the range of 500 to less than 915. Therefore, the discomfort caused by the vibration during vehicle driving is small and the seating feeling is good. In addition, since the hardness is in the range of 80 N to 250 N, the bottoming during seating can be suppressed and the seating feeling can be made good.

[0109] ■ Example 4

[0110] Regarding Example 4, except that the amount of Additive 5 (dimer acid distearyl ester, manufactured by INOAC Corporation) in Example 1 was set to 100 parts by weight, it is the same example as Example 1.

[0111] The density of the polyurethane foam of Example 4 is 108.1 kg / m 3 , the hardness is 92 N, the resilience is 29%, the air permeability is 10.2 cc / cm 2 / second, the resonance frequency is 5.66 Hz, the resonance magnification is 1.76, the integrated value of the transmissibility above 1 at the vibration frequency of 5 Hz to 10 Hz is 507, and the foam molding property is "◎".

[0112] The air permeability of the polyurethane foam of Example 4 is 6 cc / cm 2 / second or more, the resonance magnification in the vibration test according to JASO B407 is in 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 is in the range of 500 to less than 915. Therefore, the discomfort caused by the vibration during vehicle driving is small and the seating feeling is good. In addition, since the hardness is in the range of 80 N to 250 N, the bottoming during seating can be suppressed and the seating feeling can be made good.

[0113] ■ Example 5

[0114] Regarding Example 5, it is the same as Example 1 except that 10 parts by weight of Additive 6 (dilauryl dimerate, manufactured by INOAC Corporation) is added instead of Additive 5 (distearyl dimerate, manufactured by INOAC Corporation) in Example 1.

[0115] The density of the polyurethane foam of Example 5 is 54.3 kg / m 3 , the hardness is 143 N, the resilience is 53.2%, the air permeability is 92.1 cc / cm 2 / sec, the resonance frequency is 4.12 Hz, the resonance magnification is 2.98, the integrated value of the transmissibility above 1 at a vibration frequency of 5 Hz to 10 Hz is 855, and the foam molding property is "◎".

[0116] The air permeability of the polyurethane foam of Example 5 is 6 cc / cm 2 / sec or more, the resonance magnification in the vibration test according to JASO B407 is in the range of 1.5 to less than 3.43, and the integrated value of the transmissibility above 1 at a vibration frequency of 5 Hz to 10 Hz is in the range of 500 to less than 915. Therefore, the discomfort caused by vibration during vehicle driving is small and the seating feeling is good. In addition, since the hardness is in the range of 80 N to 250 N, bottoming during seating can be suppressed and the seating feeling can be made good.

[0117] ■ Comparative Example 1

[0118] Comparative Example 1 is an example that does not contain any of Additives 1 to 5 and has an isocyanate index of 100, and the others are the same as Examples 1 to 4.

[0119] The density of the polyurethane foam of Comparative Example 1 is 50.3 kg / m 3 , the hardness is 144 N, the resilience is 53.7%, the air permeability is 118 cc / cm 2 / sec, the resonance frequency is 3.96 Hz, the resonance magnification is 3.43, the integrated value of the transmissibility above 1 at a vibration frequency of 5 Hz to 10 Hz is 915, and the foam molding property is "◎".

[0120] Since the resonance magnification in the vibration test according to JASO B407 of the polyurethane foam of Comparative Example 1 exceeds the range of 1.5 to less than 3.43, and the integrated value of the transmissibility above 1 at a vibration frequency of 5 Hz to 10 Hz exceeds the range of 500 to less than 915, the discomfort caused by vibration is large and a good seating feeling cannot be obtained.

[0121] ■ Comparative Example 2

[0122] Comparative Example 2 is an example in which 10 parts by weight of Additive 1 (diisononyl adipate, product name: DINA) is added, and the others are the same as Comparative Example 1.

[0123] The density of the polyurethane foam of Comparative Example 2 was 57.4 kg / m 3 , the hardness was 120 N, the resilience was 55.6%, the air permeability was 90.8 cc / cm 2 / sec, the resonance frequency was 4.65 Hz, the resonance magnification was 3.53, the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz was 964, and the foam molding property was "◎".

[0124] Since the resonance magnification of the polyurethane foam of Comparative Example 2 in the vibration test according to JASO B407 exceeded the range of 1.5 to less than 3.43, and the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz exceeded the range of 500 to less than 915, the discomfort to vibration was large and a good seating feeling could not be obtained.

[0125] ■ Comparative Example 3

[0126] Regarding Comparative Example 3, 20 parts by weight of Additive 1 (diisononyl adipate, product name: DINA) was added, and the isocyanate index was set to 105. Otherwise, it was the same as Comparative Example 2.

[0127] The density of the polyurethane foam of Comparative Example 3 was 70.7 kg / m 3 , the hardness was 127 N, the resilience was 53.6%, the air permeability was 35 cc / cm 2 / sec, the resonance frequency was 5.10 Hz, the resonance magnification was 3.22, the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz was 991, and the foam molding property was "◎".

[0128] Since in the vibration test according to JASO B407 of the polyurethane foam of Comparative Example 3, the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz exceeded the range of 500 to less than 915, the discomfort to vibration was large and a good seating feeling could not be obtained.

[0129] ■ Comparative Example 4

[0130] Regarding Comparative Example 4, except for adding 10 parts by weight of Additive 3 (grease, product name: FPL-32), it was the same as Comparative Example 1.

[0131] The density of the polyurethane foam of Comparative Example 4 was 52.9 kg / m 3 , the hardness was 117 N, the resilience was 25.5%, the air permeability was 3.2 cc / cm 2 / sec, the resonance frequency was 8.69 Hz, the resonance magnification was 2.32, the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz was 1072, and the foam molding property was "◎".

[0132] Since the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz exceeded the range of 500 to less than 915 in the vibration test according to JASO B407 for the polyurethane foam of Comparative Example 4, the discomfort due to vibration was large and a good riding feeling could not be obtained.

[0133] ■ Comparative Example 5

[0134] Regarding Comparative Example 5, it was the same as Comparative Example 4 except that 20 parts by weight of Additive 3 (grease, product name: FPL-32) was added.

[0135] The density of the polyurethane foam of Comparative Example 5 was 54.2 kg / m 3 , the hardness was 109 N, the resilience was 43%, the air permeability was 0.1 cc / cm 2 / sec, the resonance frequency was 9.07 Hz, the resonance magnification was 2.48, the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz was 1065, and the foam molding property was “◎”.

[0136] Since the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz exceeded the range of 500 to less than 915 in the vibration test according to JASO B407 for the polyurethane foam of Comparative Example 5, the discomfort due to vibration was large and a good riding feeling could not be obtained.

[0137] ■ Comparative Example 6

[0138] Regarding Comparative Example 6, it was the same as Comparative Example 1 except that 10 parts by weight of Additive 4 (isocetyl stearate, manufactured by Fujifilm Wako Pure Chemical Corporation) was added.

[0139] The density of the polyurethane foam of Comparative Example 6 was 59.6 kg / m 3 , the hardness was 128 N, the resilience was 55%, the air permeability was 137 cc / cm 2 / sec, the resonance frequency was 4.0 Hz, the resonance magnification was 3.8, the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz was 623, and the foam molding property was “◎”.

[0140] Since the resonance magnification in the vibration test according to JASO B407 for the polyurethane foam of Comparative Example 6 exceeded the range of 1.5 to less than 3.43, the discomfort due to vibration was large and a good riding feeling could not be obtained.

[0141] ■ Comparative Example 7

[0142] Regarding Comparative Example 7, it is 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 Corporation) is added.

[0143] The density of the polyurethane foam of Comparative Example 6 was 74.3 kg / m 3 , the hardness was 110 N, the resilience was 54%, the air permeability was 14.5 cc / cm 2 / second, the resonance frequency was 4.9 Hz, the resonance magnification was 3.1, the integrated value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz was 785.1, and the foam moldability was "×".

[0144] The foaming state of the polyurethane foam of Comparative Example 7 was a broken state, and a good foam that could be used as a cushion could not be obtained.

[0145] Thus, the vehicle cushion and the vehicle seat cushion of the present invention can reduce the discomfort caused by vibrations during vehicle driving and can provide a good seating feeling.

Claims

1. A cushion for a vehicle, which is made of a polyurethane foam body, characterized in that, the polyurethane foam body is formed from a polyurethane foam composition containing a polyether polyol, an isocyanate, a catalyst, a foaming agent, and an additive, the additive is a dimer acid polyester polyol having a weight average molecular weight of 2500, a functional group number of 3.31, a melting point of less than -20 °C, and an OH value of 74.4, in the polyurethane foam composition, the amount of the dimer acid polyester polyol is 5 parts by weight or more and 20 parts by weight or less relative to 100 parts by weight of the polyether polyol, 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 buffer pad for a vehicle according to claim 1, characterized in that, the resonance magnification factor of the polyurethane foam body according to the vibration test of JASO B407 is 1.5 or more and less than 3.43, and the integral value of the transmissibility of 1 or more at a vibration frequency of 5 Hz to 10 Hz is 500 or more and less than 915.

3. The buffer pad for a vehicle according to claim 1 or 2, characterized in that, The hardness of the polyurethane foam body according to the 6.7D method of JIS K6400-2:2012 is 80 N to 250 N.

4. The buffer pad for a vehicle according to claim 1 or 2, characterized in that, The density of the polyurethane foam according to JIS K7220 is 30 kg / m 3 to 150 kg / m 3 .

5. A seat cushion for a vehicle, comprising: a seat cushion main body; and the cushion for a vehicle according to any one of claims 1 to 4 laminated on the seat cushion main body.

Images