JP2022020678A - Vehicle interior material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle interior material which is formed of polyurethane resin foam molded by metallic molding such that the surface and inside have high breathability and which can increase an efficiency of cooling and heating in a room of a vehicle and can contribute to energy saving.

SOLUTION: A vehicle interior material such as a seat cushion is formed of polyurethane resin foam molded by metallic molding. The polyurethane resin foam molded by metallic molding is formed in an open-cell structure. A ratio of the permeability of a skin layer set to a numerator to the permeability of a core layer set to a denominator is 0.55 or greater, and the permeability of the skin layer is set at 55 cm³/cm² sec (JIS L1096: Frazier Method A-Method, thickness 15 mm) or more.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to an interior material for a vehicle.

Conventionally, a molded product of a polyurethane resin foam has been used as an interior material for a vehicle such as a seat cushion, a headrest or an armrest.
A mold molded product of a polyurethane resin foam is also called a mold foam, and is manufactured by a mold foaming method.

In the mold foaming method, a composition for a polyurethane resin foam containing a polyol, a foaming agent, a catalyst, and an isocyanate is injected into a mold and foamed by a reaction between the polyol and isocyanate to form a mold of the polyurethane resin foam. Is a method of manufacturing. The mold foaming method has an advantage that post-processing for forming a post-product shape can be reduced because a polyurethane resin foam having a product shape can be obtained by foaming.

The mold molded product of the polyurethane resin foam is formed by contacting the foam with the inner surface of the mold at the time of manufacturing, and therefore, although there is a difference between thick and thin, the surface of the foam is called a skin layer. It has a dense layer. Due to the presence of the skin layer on the surface, the mold molded product of the polyurethane resin foam has extremely low air permeability near the surface even if the air permeability inside the foam is high.

By the way, when using a car, it is necessary to operate the car air conditioner to promptly bring the temperature inside the car to an appropriate temperature. However, when the interior material for a vehicle stores heat, there is a problem that a large amount of energy is required to bring the temperature to an appropriate level and it takes time. Therefore, in recent years, in order to save energy, it has been required to improve the cooling and heating efficiency of the vehicle interior.
However, the vehicle interior material made of a conventional polyurethane resin foam mold product requires a large amount of energy to bring the vehicle interior to an appropriate temperature because the air permeability of the skin layer portion is extremely low as described above. It was.

In the technique of soft slab foam, a highly breathable foam has been proposed. The soft slab foam is manufactured by the slab foaming method. In the slab foaming method, a composition for a polyurethane resin foam is discharged onto a conveyor, and the composition is freely foamed on a moving conveyor at room temperature and atmospheric pressure to cure the composition, and is cut to a predetermined length to obtain a slab stock. The method. The slab foam produced by the slab foaming method needs to be processed into a product shape after that, and has a problem that it takes more time and effort than the foam obtained by the mold foaming method.

Japanese Patent No. 6046842

The present invention has been made in view of the above points, and is a mold of a polyurethane resin foam which has high air permeability on the surface and inside, can improve the efficiency of heating and cooling in a vehicle interior, and can contribute to energy saving. The purpose is to provide interior materials for vehicles made of molded products.

The invention of claim 1 is an interior material for a vehicle made of a mold-molded product of a polyurethane resin foam. The mold-molded product of the polyurethane resin foam has an open cell structure, and the air permeability of the skin layer is a molecule. , The ratio of the air permeability with the air permeability of the core layer as the denominator is 0.55 or more, and the air permeability of the skin layer is 55 cm ³ / cm ² · sec (JIS L1096: Frazier type A method, thickness 15 mm) or more. It is characterized by being.

The invention of claim 2 is characterized in that, in claim 1, the mold-molded product of the polyurethane resin foam does not require a crushing treatment or a film-removing treatment for adjusting the air permeability after demolding. ..

According to the third aspect of the present invention, in the first or second aspect, the mold-molded product of the polyurethane resin foam is formed from a composition for a urethane resin foam containing a polyol, a catalyst, a foaming agent, and an isocyanate. The polyol is characterized by containing two types of polyols that are incompatible with each other.

The invention of claim 4 is the invention of claim 3, wherein the two types of polyols that are incompatible with each other are a polyether polyol having an ethylene oxide addition rate of 70% by weight or more and an ethylene oxide addition rate of less than 25% by weight. It is characterized in that there are two types of polyether polyols, or two types of polyether polyols and polyester polyols having an ethylene oxide addition rate of 70% by weight or more.

The invention of claim 5 is characterized in that, in claim 4, the polyester polyol is a polyester polyol derived from castor oil.

According to the present invention, it is possible to obtain a vehicle interior material made of a mold-molded product of a polyurethane resin foam having good air permeability on the surface and inside, and it is possible to improve the efficiency of heating and cooling in the vehicle interior, which contributes to energy saving. be able to.

It is sectional drawing of an example of the interior material for a vehicle of this invention. It is sectional drawing which shows the time of manufacturing of the interior material for a vehicle. It is a table which shows the composition of an Example and a comparative example, and the measurement result such as the air permeability.

An embodiment of the present invention will be described. The vehicle interior material 10 of the embodiment of the present invention shown in FIG. 1 is used as a seat cushion.
The vehicle interior material 10 for the seat cushion is made of a mold-molded product of a polyurethane resin foam. In the molded product of the polyurethane resin foam, the bubble structure is an open cell structure, the air permeability of the skin layer 11 is the numerator, and the air permeability of the core layer 12 is the denominator, and the ratio of the air permeability is 0.55 or more. The air permeability of the skin layer is 55 cm ³ / cm ² · sec (JIS L1096: Frazier type A method, thickness 15 mm) or more.

The skin layer 11 is a surface portion formed in contact with the inner surface of the mold during foaming of the mold molded product of the polyurethane resin foam, and has a higher density than the core layer 12. As described above, the air permeability of the skin layer 11 has a value measured according to JIS L1096: Frazier A method (thickness 15 mm) of 55 cm ³ / cm ² · sec or more, more preferably 80 cm ³ / cm ² . It is sec or more, more preferably 100 to 300 cm ³ / cm ² · sec.

The core layer 12 refers to a portion inside (inside) the skin layer 11 in the molded product of the polyurethane resin foam. The air permeability of the core layer 12 is measured according to JIS L1096: Frazier type A method (thickness 15 mm). The ratio of the air permeability using the air permeability of the skin layer 11 as a numerator and the air permeability of the core layer 12 as a denominator is 0.55 or more, more preferably 0.60 or more, and particularly 0.60 to 1.2. Is. The air permeability of the skin layer is a value measured for a portion 15 mm from the surface of the molded product of the polyurethane resin foam. The air permeability of the core layer is a value measured at the central portion separated from the surface by 15 mm or more in the mold molded product of the polyurethane resin foam.

The mold molded product of the polyurethane resin foam constituting the vehicle interior material 10 is obtained by a mold foaming method, and in the present invention, a crushing treatment or a film removal for adjusting the air permeability after demolding is performed. It does not require any processing. The crushing treatment is a treatment for compressing the foam to destroy the cell membrane of the foam, while the film removal treatment is a treatment for destroying the cell membrane of the foam by the blast of combustion gas, or with alkali. It is a process of removing by hydrolysis.

A method of manufacturing a mold-molded product of a polyurethane resin foam constituting the vehicle interior material 10 by a mold foaming method will be described.
First, as shown in FIG. 2 (2-A), the polyurethane resin foam composition P is injected into the mold 20 by the injection nozzle N. The mold 20 is composed of a lower mold 21 and an upper mold 22, and has a mold inner surface having a shape equal to the outer shape of the vehicle interior material to be manufactured.

Next, the mold 20 is closed as shown in FIG. 2 (2-B) to foam the polyurethane resin foam composition P, and the mold 20 is filled as shown in FIG. 2 (2-C). Let me. As a result, the mold molded product 10 of the polyurethane resin foam is foamed and formed, and then the mold molded product 10 of the polyurethane resin foam is taken out from the mold 20.

In the illustrated example, an example of open mold foaming in which the composition P for a polyurethane resin foam is injected with the mold 20 open and the mold 20 is closed after the injection is shown, but the mold is closed. Closed mold foaming may be used in which the composition for polyurethane resin foam is injected from the holes provided in the mold in the state.

The composition P for a polyurethane resin foam contains a polyol, a catalyst, a foaming agent, and an isocyanate.
The polyol contains two types of polyols that are incompatible with each other. The two types of incompatible polyols are the polyether polyol A1 having an ethylene oxide (EO) addition rate of 70% by weight or more, and the polyether polyol having an ethylene oxide (EO) addition rate of less than 25% by weight. Examples thereof include a combination of two types of polyether polyols composed of the polyol A2, or a combination of the above two types of the polyether polyol A1 and the polyester polyol A3. The addition rate (% by weight) of ethylene oxide (EO) is the weight ratio of EO to the total amount of alkylene oxide (AO) such as EO and PO (propylene oxide) which are monomers in the production of the polyether polyol, and is the weight of EO. It is a value calculated by × 100 / total amount of AO (EO weight + PO weight, etc.).

The polyether polyol A1 preferably has an ethylene oxide (EO) addition rate of 70% by weight or more, a functional group number of 2 to 4, and a molecular weight of 7,000 or less, and more preferably an ethylene oxide (EO) addition rate of 75% by weight or more. It has a molecular weight of 300 to 7000 and includes a polymer polyol type.

The polyether polyol A2 preferably has an ethylene oxide (EO) addition rate of less than 25% by weight, a functional group number of 1 to 4, and a molecular weight of 7,000 or less, and more preferably an ethylene oxide (EO) addition rate of less than 20% by weight. It has a molecular weight of 500 to 7000 and includes polymer polyol types.

The weight ratio of the polyether polyol A1 to the polyether polyol A2 is preferably A1: A2 = 80:20 to 20:80, more preferably 70:30 to 30:70.
Further, the polyether polyols A1 and A2 are not limited to one polyether polyol, respectively, and a plurality of polyether polyols A1 and A2 may be used. More specifically, the polyether polyol A1 is a polyol having an ethylene oxide (EO) addition rate of 70% by weight or more, and has a high molecular weight polyol having a molecular weight of 1700 to 7000 and a low molecular weight polyol having a molecular weight of less than 300 to 1700. And may be mixed. Further, as the polyether polyol A2, a high molecular weight polyol having an ethylene oxide (EO) addition rate of less than 25% by weight and having a molecular weight of 1700 to 7000 and a low molecular weight polyol having a molecular weight of less than 500 to 1700 are mixed. May be.

Examples of the polyol to be mixed with the polyether polyol A1 having an ethylene oxide (EO) addition rate of 70% by weight or more include polyether all A2 (a polyol having an ethylene oxide (EO) addition rate of less than 25% by weight). Examples thereof include the polyester polyol A3. The polyester polyol A3 preferably has 2 to 4 functional groups and a molecular weight of 7,000 or less, and more preferably 500 to 4000. As the polyester polyol A3, a polyester polyol derived from castor oil is more preferable.

The weight ratio of the polyester polyol A3 to the polyether polyol A1 is preferably A1: A3 = 80: 20 to 20:80, more preferably 60:40 to 40:60.
Further, the polyester polyol A3 and the polyether polyol A1 are not limited to one type each, and a plurality of polyester polyols A3 and a plurality of polyether polyols A1 may be used.

As the catalyst, a known catalyst for urethane resin foam can be used. For example, amine catalysts such as triethylamine, triethylenediamine, diethanolamine, dimethylaminomorpholine, N-ethylmorpholine, tetramethylguanidine, tin catalysts such as stanus octate and dibutyltin dilaurate, phenylmercuric propionate or lead octenoate. And other metal catalysts (also referred to as organic metal catalysts). Two or more kinds of catalysts may be used.

As the foaming agent, hydrocarbons such as water, CFC substitutes or pentane can be used alone or in combination. In the case of water, carbon dioxide gas is generated during the reaction between the polyol and isocyanate, and the carbon dioxide gas causes foaming. The amount of water as a foaming agent is preferably 1.0 to 4.0 parts by weight with respect to 100 parts by weight of the polyol.

As the isocyanate, an aliphatic or aromatic polyisocyanate having two or more isocyanate groups, a mixture thereof, and a modified polyisocyanate obtained by modifying them can be used. Examples of the aliphatic polyisocyanate include hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexamethane diisocyanate and the like, and examples of the aromatic polyisocyanate include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalenedi isocyanate and xiri. Examples thereof include range isocyanate and polypeptide polyisocyanate (crude MDI). In addition, other prepolymers modified from these can also be used.

In the present invention, the isocyanate is particularly preferably diphenylmethane diisocyanate (MDI) alone, polypeptide polyisocyanate (crude MDI) alone, or a mixture thereof (MDI-based isocyanate), or the above-mentioned MDI-based isocyanate and toluene diisocyanate (TDI) in combination. ..
When MDI-based isocyanate and toluene diisocyanate (TDI) are used in combination, those having MDI-based isocyanate of 20% or more are preferable.

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

Examples of other components contained in the polyurethane resin foam composition P include auxiliary agents such as a foam stabilizer, a cross-linking agent, a colorant, a flame retardant, and a colorant.
As the foam stabilizer, those known for polyurethane resin foams can be used. For example, a silicone-based defoaming agent, a fluorine-containing compound-based defoaming agent, and a known surfactant can be mentioned. The amount of the foam stabilizer is 0.2 to 3.0 parts by weight with respect to 100 parts by weight of the polyol.
As the cross-linking agent, known ones for polyurethane resin foams can be used. For example, polyhydric alcohols such as glycerin, 1,4-butanediol and diethylene glycol, and amines such as ethanolamines and polyethylene polyamines can be mentioned. Two or more kinds of cross-linking agents may be used.
Flame retardants include halogenated polymers such as polyvinyl chloride, chloroprene rubber and chlorinated polyethylene, phosphoric acid esters and halogenated phosphoric acid ester compounds, organic flame retardants such as melamine resin and urea resin, antimony oxide and aluminum hydroxide. Inorganic flame retardants such as, etc. can be mentioned.
Examples of the colorant include pigments and graphite. The amount of colorant is determined according to the type of colorant.

The packing ratio (filling ratio) when the composition for polyurethane resin foam is injected into a mold is preferably 100 to 200%, more preferably 105 to 150%. The packing rate (filling rate) is calculated by (density at the time of mold foaming / density at the time of free foaming) × 100.

The following components were mixed with the composition for polyurethane resin foam prepared by the formulation of each example and each comparative example of FIG. 3 and injected into a mold to produce a mold molded product of the polyurethane resin foam. The inner surface shape and dimensions of the mold consisted of a rectangular parallelepiped of 20 x 20 x 8 cm, and the pack ratio was 105%.

Polyether polyol A1-1: EO addition rate = 100% by weight polyoxyethylene polyol, molecular weight = 400, number of functional groups = 2, OHV = 280 mgKOH / g
Polyether polyol A1-2: EO addition rate = 75% by weight, polyoxyalkylene polyol, molecular weight = 3300, number of functional groups = 3, OHV = 51 mgKOH / g
-Polyether polyol A1-3: EO addition rate = 80% by weight, polyoxyalkylene polyol, molecular weight = 4000, number of functional groups = 3, OHV = 39 mgKOH / g
-Polyether polyol A1-4: EO addition rate = 70% by weight, polyoxyalkylene polyol, molecular weight = 7000, number of functional groups = 3, OHV = 26 mgKOH / g

Polyether polyol A2-1: EO addition rate = 0 wt% PO (propylene oxide) -added polyoxypropylene polyol, molecular weight = 600, number of functional groups = 2, OHV = 187 mgKOH / g
Polyether polyol A2-2: PO (propylene oxide) -added polyoxypropylene polyol with EO addition rate = 0% by weight, molecular weight = 1000, number of functional groups = 2, OHV = 112 mgKOH / g
Polyether polyol A2-3: PO (propylene oxide) -added polyoxypropylene polyol with EO addition rate = 0% by weight, molecular weight = 1340, number of functional groups = 1, OHV = 42 mgKOH / g
Polyether polyol A2-4: PO (propylene oxide) -added polyoxypropylene polyol with EO addition rate = 0% by weight, molecular weight = 3000, number of functional groups = 3, OHV = 56 mgKOH / g
Polyether polyol A2-5: EO addition rate = 15% by weight, polyoxyalkylene polyol, molecular weight = 5000, number of functional groups = 3, OHV = 33 mgKOH / g
Polyether polyol A2-6: EO addition rate = 15% by weight, polyoxyalkylene polyol, molecular weight = 5000, number of functional groups = 3, OHV = 28mgKOH / g, polymer polyol (polymer content 20% by weight)
Polyether polyol A2-7: EO addition rate = 15% by weight, polyoxyalkylene polyol, molecular weight = 7000, number of functional groups = 4, OHV = 31 mgKOH / g

-Polyester polyol A3: Polyester polyol derived from castor oil, molecular weight = 735, number of functional groups = 2.2, OHV = 168 mgKOH / g, castor oil content = 70% by weight, product number; Y-406, manufactured by Itoh Oil Chemicals, Inc.

-Catalyst-1: Bis (2-dimethylaminoethyl) ether, product number; BL-19, manufactured by Air Products Japan Co., Ltd.-Catalyst-2: 33% dipropylene glycol solution of triethylenediamine, product number; DABCO-33-LV, air Made by Products Japan Co., Ltd. ・ Catalyst-3: Stanas Octate, manufactured by Johoku Kagaku Co., Ltd.

・ Defoaming agent-1: dimethylsiloxane copolymer, product number; L-629, manufactured by MOMENTIVE ・ Foaming agent-2: dimethylsiloxane copolymer, product number; B-8738LF, manufactured by EVONIK ・ Defoaming agent-3: dimethylsiloxane copolymer , Part number; L-3184J, manufactured by MOMENTIVE ・ Defoamer-1: Glycerin ・ Defoamer-2: Diethyleneamine

50% of 80:20 mixture of isocyanate-1: 2,4-toluene diisocyanate (TDI) and 2,6-toluene diisocyanate (TDI) and 50% of polypeptide polyisocyanate (crude MDI), part number; TM -50, manufactured by Mitsui Chemicals Co., Ltd. ・ 80% mixture of isocyanate-2: 2,4-toluene diisocyanate (TDI) and 2,6-toluene diisocyanate (TDI) 80:20 and 20% polypeptide polyisocyanate (crude MDI) Mixture with, product number; TM-20, manufactured by Mitsui Chemicals, Inc. ・ isocyanate-3: 4,4'diphenylmethane diisocyanate monomer 60%, 2,4'diphenylmethane diisocyanate monomer 20%, and a large amount of these 20% mixture of body polypeptide polyisocyanate (crude MDI)

The density (JIS K7222: 2005) and the air permeability (JIS L1096: Frazier type A method, thickness 15 mm) were measured with respect to the obtained Examples 1 to 6 and Comparative Examples 1 to 4. The air permeability was measured for the skin layer and the core layer. The measurement of the air permeability to the skin layer was performed by cutting a sample having a thickness of 15 mm including the surface. On the other hand, the air permeability to the core layer was measured by cutting a sample having a thickness of 15 mm at the inner center not including the range from the surface to 15 mm. In addition, [the air permeability of the skin layer / the air permeability of the core layer] was calculated as the air permeability ratio. The measurement results are shown in FIG.

In Example 1, as the polyether polyol A1 having an EO addition rate of 70% by weight or more, the polyether polyol A1-4 having an EO addition rate of 70% by weight is used, and the EO addition rate (ethylene oxide addition rate) is 25. This is an example in which two types of polyether polyols A2-1 and A2-4 having an EO addition rate of 0% by weight are used as the polyether polyol A2 having an EO addition rate of less than 0% by weight. The density of Example 1 was 57 kg / m ³ , the air permeability of the skin layer was 62 cm ³ / cm ² · s, the air permeability of the core layer was 113 cm ³ / cm ² · s, and the air permeability ratio was 0.55.

In Example 2, as the polyether polyol A1 having an EO addition rate of 70% by weight or more, the polyether polyol A1-1 having an EO addition rate of 100% by weight and the polyether polyol A1-3 having an EO addition rate of 80% by weight are also used. As a polyether polyol A2 having an EO addition rate (addition rate of ethylene oxide) of less than 25% by weight, two types of polyether polyols A2-3 and A2- having an EO addition rate of 0% by weight are used. This is an example using 4. The density of Example 2 was 53 kg / m ³ , the air permeability of the skin layer was 153 cm ³ / cm ² · s, the air permeability of the core layer was 235 cm ³ / cm ² · s, and the air permeability ratio was 0.65.

In Example 3, as the polyether polyol A1 having an EO addition rate of 70% by weight or more, the polyether polyol A1-2 having an EO addition rate of 75% by weight and the polyether polyol A1-3 having an EO addition rate of 80% by weight are shown. As a polyether polyol A2 having an EO addition rate (addition rate of ethylene oxide) of less than 25% by weight, the polyether polyols A2-2 and A2-4 having an EO addition rate of 0% by weight are used. This is an example using three types of polyether polyol A2-7 having an EO addition rate of 15% by weight. The density of Example 3 was 55 kg / m ³ , the air permeability of the skin layer was 122 cm ³ / cm ² · s, the air permeability of the core layer was 143 cm ³ / cm ² · s, and the air permeability ratio was 0.85.

In Example 4, as a polyether polyol having an EO addition rate of 70% by weight or more, a polyether polyol A1-2 having an EO addition rate of 75% by weight and a polyether polyol A1-3 having an EO addition rate of 80% by weight are used. Two types are used, and as a polyether polyol A2 having an EO addition rate (ethylene oxide addition rate) of less than 25% by weight, the polyether polyols A2-2 and A2-4 having an EO addition rate of 0% by weight and EO addition This is an example using three types of polyether polyols A2-7 having a ratio of 15%. The density of Example 4 was 60 kg / m ³ , the air permeability of the skin layer was 116 cm ³ / cm ² · s, the air permeability of the core layer was 138 cm ³ / cm ² · s, and the air permeability ratio was 0.84.

Example 5 is an example in which 40 parts by weight of a polyester polyol derived from castor oil is used as the polyester polyol A3, and 60 parts by weight of the polyether polyol A1-2 having an EO addition rate of 75% by weight is used as the polyether polyol A1. .. The density of Example 5 was 45 kg / m ³ , the air permeability of the skin layer was 107 cm ³ / cm ² · s, the air permeability of the core layer was 136 cm ³ / cm ² · s, and the air permeability ratio was 0.79.

Example 6 is an example in which 50 parts by weight of a polyester polyol derived from castor oil is used as the polyester polyol A3, and 50 parts by weight of the polyether polyol A1-2 having an EO addition rate of 75% by weight is used as the polyether polyol A1. .. The density of Example 6 was 46 kg / m ³ , the air permeability of the skin layer was 87 cm ³ / cm ² · s, the air permeability of the core layer was 112 cm ³ / cm ² · s, and the air permeability ratio was 0.78.
In Examples 2 to 4, the air permeability of the skin layer is high by containing a polyether polyol having an EO addition rate of 80% by weight or more.

Comparative Example 1 is a polyether polyol A2 having an EO addition rate (ethylene oxide addition rate) of less than 25% by weight without using a polyether polyol having an EO addition rate of 70% by weight or more, and has an EO addition rate of 15% by weight. A mold molded product of a polyurethane resin foam was produced using two types of polyether polyols A2-5 and A2-6, which are%. The density of Comparative Example 1 was 57 kg / m ³ , the air permeability of the skin layer was 28 cm ³ / cm ² · s, the air permeability of the core layer was 50 cm ³ / cm ² · s, and the air permeability ratio was 0.56.

Comparative Example 2 is a polyether polyol A2 having an EO addition rate (ethylene oxide addition rate) of less than 25% by weight without using a polyether polyol having an EO addition rate of 70% by weight or more, and has an EO addition rate of 15% by weight. A mold-molded product of a polyurethane resin foam was produced using three types of polyether polyols A2-5, A2-6, and A2-7, which are%. The density of Comparative Example 2 was 59 kg / m ³ , the air permeability of the skin layer was 1 cm ³ / cm ² · s, the air permeability of the core layer was 11 cm ³ / cm ² · s, and the air permeability ratio was 0.09.

Comparative Example 3 is a polyether polyol A2 having an EO addition rate (ethylene oxide addition rate) of less than 25% by weight without using a polyether polyol having an EO addition rate of 70% by weight or more, and has an EO addition rate of 15% by weight. A mold-molded product of a polyurethane resin foam was produced using two types of polyether polyols A2-5 and A2-6, which are%. The density of Comparative Example 3 was 53 kg / m ³ , the air permeability of the skin layer was 38 cm ³ / cm ² · s, the air permeability of the core layer was 64 cm ³ / cm ² · s, and the air permeability ratio was 0.59.

Comparative Example 4 is a polyether polyol A2 having an EO addition rate (ethylene oxide addition rate) of less than 25% by weight without using a polyether polyol having an EO addition rate of 70% by weight or more, and has an EO addition rate of 15% by weight. A mold-molded product of a polyurethane resin foam was produced using three types of polyether polyols A2-5, A2-6 and A2-7, which are%. The density of Comparative Example 4 was 30 kg / m ³ , the air permeability of the skin layer was 2 cm ³ / cm ² · s, the air permeability of the core layer was 19 cm ³ / cm ² · s, and the air permeability ratio was 0.11.

For Examples 1 to 6 and Comparative Examples 1 to 4, heat dissipation and heat resistance were measured.
For the measurement of heat dissipation, the test samples of Examples 1 to 6 and Comparative Examples 1 to 4 were heated in a furnace at 80 ° C. for 3 hours, and then the test samples were placed on 10 × 10 × 2 cm styrofoam at 20 ° C. at room temperature. The temperature change in the test sample was measured by placing it horizontally. To measure the temperature change, a thermocouple was inserted into the test sample to directly measure the temperature change in the test sample. The measurement results showed that the temperature in the test sample reached 36 ° C. (body temperature) for 0.75 hours in Example 1, 0.5 hours in Example 2, and 0.6 hours in Examples 3 to 5. In Example 6, it took 0.7 hours, whereas in Comparative Example 1, it took 1.1 hours, Comparative Example 3 took 1 hour, Comparative Examples 2 and 4 took 1.5 hours, and Examples 1 to 6 took. The heat dissipation was better than that of Comparative Examples 1 to 4. Therefore, the vehicle interior materials of Examples 1 to 6 have good heat dissipation of the vehicle interior material when the car air conditioner is operated to cool the inside of the vehicle in the summer, so that the inside of the vehicle can be cooled to a set temperature. The time required can be shortened and an energy saving effect can be obtained.

For the measurement of heatability, the test samples of Examples 1 to 6 and Comparative Examples 1 to 4 were placed in a heat insulating box (internal size 70 × 70 × 60 cm) containing a hot air heater (300 W) in a size of 10 × 10 × 2 cm. The temperature changes in the test sample that was placed horizontally on Styrofoam to heat the inside of the heat insulating box so that the hot air from the hot air heater did not directly hit the test sample and placed it in a room at 19 ° C in advance. Was measured. To measure the temperature change, a thermocouple was inserted into the test sample to directly measure the temperature change in the test sample. The measurement results show that the temperature in the test sample reaches 41 ° C. for 2 hours in Example 1, 1 hour in Example 2, 1.2 hours in Examples 3 to 5, and 1.5 hours in Example 6. However, Comparative Examples 1 and 3 took 3 hours, Comparative Examples 2 and 4 took 4 hours, and Examples 1 to 6 had better heatability than Comparative Examples 1 to 4. Therefore, the vehicle interior materials of Examples 1 to 6 have good heatability of the vehicle interior material when the car air conditioner is operated to heat the inside of the vehicle in winter, so that the inside of the vehicle can be heated to a set temperature. The time required can be shortened and an energy saving effect can be obtained.

As described above, the example product has better heat dissipation and heat resistance than the comparative example product (conventional product), and can be heated and cooled in a short time. That is, the vehicle interior material of the present invention can increase the efficiency of heating and cooling the interior of the vehicle by the car air conditioner, and can contribute to energy saving. In particular, since the seat cushion has a large volume among the interior materials for vehicles, if the interior material for vehicles of the present invention is used for the seat cushion, a larger energy saving effect can be obtained.
Further, this mold-molded product can be used not only for seat cushions but also for interior materials for vehicles such as headrests and armrests.

The first aspect is an interior material for a vehicle made of a mold-molded product of a polyurethane resin foam, wherein the mold-molded product of the polyurethane resin foam has an open cell structure, and the air permeability of the skin layer is a molecule. The air permeability ratio with the air permeability of the core layer as the denominator is 0.55 or more, and the air permeability of the skin layer is 55 cm ³ / cm ² · sec (JIS L1096: Frazier type A method, thickness 15 mm) or more. It is characterized by that.

The second aspect is characterized in that, in the first aspect , the mold molded product of the polyurethane resin foam does not require a crushing treatment or a film removing treatment for adjusting the air permeability after demolding. ..

In the third aspect, in the first or second aspect , the mold-molded product of the polyurethane resin foam is formed from a composition for a polyurethane resin foam containing a polyol, a catalyst, a foaming agent, and an isocyanate. The polyol is characterized by containing two types of polyols that are incompatible with each other.

In the fourth aspect, in the third aspect , the two types of polyols that are incompatible with each other are a polyether polyol having an ethylene oxide addition rate of 70% by weight or more and an ethylene oxide addition rate of less than 25% by weight. It is characterized in that there are two types of polyether polyols, or two types of polyether polyols and polyester polyols having an ethylene oxide addition rate of 70% by weight or more.

A fifth aspect is characterized in that, in the fourth aspect , the polyester polyol is a polyester polyol derived from castor oil.

Claims (5)

In vehicle interior materials made of polyurethane resin foam mold molded products
The molded product of the polyurethane resin foam has an open cell structure, and the ratio of the air permeability with the air permeability of the skin layer as the numerator and the air permeability of the core layer as the denominator is 0.55 or more, and the skin. An interior material for vehicles characterized in that the air permeability of the layer is 55 cm ³ / cm ² · sec (JIS L1096: Frazier type A method, thickness 15 mm) or more. The vehicle interior material according to claim 1, wherein the mold molded product of the polyurethane resin foam does not require a crushing treatment or a film removal treatment for adjusting the air permeability after demolding. The mold molded product of the polyurethane resin foam is formed from a composition for a urethane resin foam containing a polyol, a catalyst, a foaming agent, and an isocyanate.
The vehicle interior material according to claim 1 or 2, wherein the polyol contains two types of polyols that are incompatible with each other. The two types of incompatible polyols are a polyether polyol having an ethylene oxide addition rate of 70% by weight or more, a polyether polyol having an ethylene oxide addition rate of less than 25% by weight, or an ethylene oxide. The interior material for a vehicle according to claim 3, wherein the material is a polyether polyol having an addition rate of 70% by weight or more and a polyester polyol. The vehicle interior material according to claim 4, wherein the polyester polyol is a polyester polyol derived from castor oil.

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