JP2016155295A - Soft composite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft composite from which an excellent feeling can be obtained easily, when pressing it.SOLUTION: A soft composite 11 for a vehicle interior component includes a body member 12 made of crosslinked gelatinous urethane, and an epidermal layer 13. The Askar F hardness of the body member 12 is in the range of 20-50, The shear storage elastic modulus of the body member 12 is in the range of 2-14 kPa in a temperature range of 0-60°C. The soft composite 11 is installed on the vehicle interior component.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a soft composite for a vehicle interior member that is attached to an interior member of a vehicle.

  Conventionally, a cushion body in which a cushion body made of urethane foam is covered with a skin layer is known (see Patent Document 1). On the lower surface of the cushion body, an impact absorbing material made of super soft urethane elastomer is laminated.

Japanese Patent Laid-Open No. 08-197651

  By the way, by attaching a soft composite comprising a soft main body member such as a super soft urethane elastomer and an outer skin layer to an interior member of a vehicle, a feeling based on the soft main body member can be imparted to the interior of the vehicle. Therefore, further improvement in the feel is desired.

  This invention is made | formed in view of such a situation, The objective is to provide the soft composite_body | complex which made it easy to obtain a favorable feeling when pressing.

  A soft composite that solves the above problem is a soft composite for a vehicle interior member that is attached to an interior member of a vehicle, and includes a cross-linked gel urethane main body member and a skin layer, and the main body member The Asker F hardness is in the range of 20-50, and the shear storage modulus of the main body member is in the range of 2-14 kPa in the temperature range of 0-60 ° C.

  In the soft composite, the Asker F hardness of the main body member is in a range of 20 to 40, and the shear storage modulus of the main body member is in a range of 2 to 6 kPa in the temperature range. preferable.

In the soft composite, the skin layer preferably includes a fiber outer layer and an inner layer disposed between the outer layer and the main body member, and the inner layer preferably includes a resin film layer.
In the soft composite, the resin film layer is preferably formed of a urethane film.

  According to the present invention, it is easy to obtain a good feel when pressed.

It is sectional drawing which decomposes | disassembles and shows the soft composite of embodiment. It is sectional drawing of a soft composite.

Hereinafter, embodiments of the soft composite will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the soft composite body 11 for a vehicle interior member includes a crosslinked gel-like urethane main body member 12 and a skin layer 13. The soft composite 11 of this embodiment further includes a base material B to which the skin layer 13 is fixed, and the main body member 12 is interposed between the skin layer 13 and the base material B. The soft composite 11 is attached to the interior member of the vehicle such that the outer side (surface side of the skin layer 13) is exposed in the vehicle.

<Main body member 12>
The Asker F hardness of the main body member 12 is in the range of 20 to 50, preferably in the range of 20 to 40, from the viewpoint of improving the feel when pressed from the skin layer 13 side. The Asker F hardness is measured using a commercially available Asker rubber hardness tester F type on a circular test piece having a thickness of 20 mm and a diameter of 100 mm under a temperature condition of 23 ° C. The Asker F hardness is preferably measured after the test piece is left in a room at 23 ° C. for 1 hour or longer.

  The shear storage elastic modulus of the main body member 12 is within the range of 2 to 14 kPa in the temperature range of 0 to 60 ° C. from the viewpoint of improving the feel when pressed from the skin layer 13 side, preferably 2 to 2. It is in the range of 6 kPa. The shear storage modulus can be measured using a commercially available dynamic viscoelasticity measuring device (for example, trade name: ARES-G2 rheometer, manufactured by TA Instruments). The shear storage modulus is a value measured using a parallel plate with a diameter of 40 mm under the conditions of a strain of 1% and a frequency of 1 Hz.

  The maximum thickness of the main body member 12 is preferably in the range of 5 to 50 mm, and more preferably in the range of 10 to 30 mm. When the maximum thickness of the main body member 12 is 5 mm or more, the effect of improving the feeling when pressed from the skin layer 13 side is more exhibited. When the maximum thickness of the main body member 12 exceeds 50 mm, it is difficult to improve the effect of improving the feel when pressed from the skin layer 13 side.

  The cross-linked gel urethane (hereinafter sometimes referred to simply as “gel urethane”) constituting the main body member 12 is obtained from a urethane raw material containing a polyol component and an isocyanate component. The Asker F hardness and the shear storage modulus of the main body member 12 can be adjusted by, for example, the ratio of the polyol component and the isocyanate component. Specifically, for example, by reducing the molar ratio (NCO / OH ratio) of the isocyanate group (NCO) of the isocyanate component to the hydroxyl group (OH) of the polyol component, the Asker F hardness and the shear storage modulus are reduced. Can be made. The molar ratio (NCO / OH ratio) of the isocyanate group (NCO) of the isocyanate component to the hydroxyl group (OH) of the polyol component is based on the polyol component and the structure of the isocyanate component used, and the mixing ratio of the polyol component and the isocyanate component is changed. You can adjust it.

  The molar ratio (NCO / OH ratio) of the isocyanate group (NCO) of the isocyanate component to the hydroxyl group (OH) of the polyol component is preferably set in the range of 0.81 to 0.90, for example. More preferably, it is set in the range of 82 to 0.88.

  Examples of the polyol component include polyether polyols such as polypropylene glycol, polyethylene glycol, and polytetramethylene ether glycol, polyester polyols that are hydroxyl-terminated reaction products of polyhydric alcohols and polycarboxylic acids, and polycarbonate diols. . Examples of the isocyanate component include diisocyanate monomers such as diphenylmethane diisocyanate, tolylene diisocyanate, hexamethylene diisocyanate, and prepolymers thereof.

The polyol component and the isocyanate component may each be used alone, or a plurality of types may be used for at least one of the polyol component and the isocyanate component.
The urethane raw material may contain additives such as a plasticizer, a catalyst, and a weather resistance stabilizer as necessary. The plasticizer can be used to adjust the hardness. Examples of the plasticizer include phthalic acid esters (diisodecyl phthalate (DIDP), diisononyl phthalate (DINP), etc.), benzoic acid esters, and fatty acid esters. Examples of the catalyst include amine-based catalysts and organometallic catalysts. The catalyst is preferably an organometallic catalyst from the viewpoint of promoting resinification by a urethanization reaction. The weather resistance stabilizer can be used to suppress deterioration of the main body member 12 due to heat, light, or water. Examples of weathering stabilizers include antioxidants (phenolic, phosphite, thioether, etc.), ultraviolet absorbers (benzophenone, benzotriazole, triazine, etc.), light stabilizers (hindered amines, etc.), and A hydrolysis inhibitor (carbodiimide type etc.) is mentioned.

The additive mentioned above may be used independently and may be used in combination of multiple types.
The main body member 12 (gel urethane) can be obtained by a known method in which a urethane raw material is precured by heating and then cured. The main body member 12 (gel urethane) is composed of non-foamed gel urethane.

<Skin layer 13>
The skin layer 13 of this embodiment includes a fiber outer layer 13 a and an inner layer 13 b disposed between the outer layer 13 a and the main body member 12. The inner layer 13b is composed of a resin film layer. Examples of the outer layer 13a include double raschel mesh, woven fabric, and non-woven fabric. Examples of the fibers constituting the outer layer 13a include polyester-based fibers, polyurethane-based fibers, polyamide-based fibers, polyacrylic fibers, and polyolefin-based fibers, and natural fibers such as cotton.

  As a resin film layer which comprises the inner layer 13b, a urethane film, a polyethylene film, and a polypropylene film are mentioned, for example. Among the resin film layers, a urethane film is preferable from the viewpoint that it is easy to feel the touch of the main body member 12 when the skin layer 13 is pressed due to excellent flexibility. In addition, a porous film can be used as the resin film, but a non-porous film is preferably used from the viewpoint of excellent durability and the like. The thickness of the resin film (resin film layer) is preferably 0.01 to 0.1 mm, for example.

  The outer layer 13a and the inner layer 13b can be bonded together by, for example, an adhesive or welding. The maximum thickness of the skin layer 13 is preferably thinner than the maximum thickness of the main body member 12 from the viewpoint of more exerting a feel based on the main body member 12, and is ½ or less of the maximum thickness of the main body member 12. More preferably, it is 1/5 or less.

<Base material B>
The base material B is made of a material harder than the skin layer 13 and the main body member 12. As the base material B, a metal plate, a wood board, and a synthetic resin board are mentioned, for example. As a material of the base material B, a synthetic resin plate (for example, a polyamide resin plate) is preferable from the viewpoint of weight reduction. The base material B and the above-described skin layer 13 can be integrated (bonded) by adhesion or adhesion using, for example, an adhesive or a double-sided tape. In addition, the base material B and the skin layer 13 may be integrated by arranging the peripheral portion of the skin layer 13 so as to wrap around the inner surface side of the base material B (the side opposite to the skin layer 13).

<Manufacturing method>
Next, an example of a method for producing the soft composite 11 will be described.
In order to manufacture the soft composite 11, first, the skin layer 13 is formed by integrating the outer layer 13 a and the inner layer 13 b. Next, a mold for hot pressing that heat-presses the skin layer 13 into a predetermined shape is prepared, and the surface side (outer layer 13a side) of the skin layer 13 is formed into a bulged shape using the mold. Perform the molding process. Then, the injection | pouring process which inject | pours the said urethane raw material into the back surface side (inner layer 13b side) of the skin layer 13 and the reaction process of obtaining gel-like urethane by making the injected urethane raw material react are performed. The reaction step includes, for example, a step of precuring the urethane raw material and a curing step of curing the precured urethane raw material. Thus, the main body member 12 is obtained in an integrated state with the skin layer 13 (inner layer 13b). That is, the main body member 12 can be easily obtained by casting using the skin layer 13 as a mold. Subsequently, the soft composite 11 is obtained by integrating the skin layer 13 and the base material B.

  In the above-described injection process or the like, a synthetic resin plate harder than the skin layer 13 is prepared, and a jig formed with the synthetic resin plate can be used. More specifically, the jig is molded using the above-described hot press mold. That is, the jig has the same shape as the skin layer 13. The shape of the skin layer 13 can be maintained by placing the jig such that the surface side of the skin layer 13 overlaps the jig. For this reason, a urethane raw material can be easily inject | poured into the recessed part of the back surface side of the skin layer 13 mounted in the jig | tool. Moreover, since the surface side of the skin layer 13 can be temporarily covered with the jig, for example, it is possible to suppress adhesion of a urethane raw material or the like to the surface side of the skin layer 13 during the injection process. In addition, when the jig is used, when the skin layer 13 and the base material B are integrated, the skin layer 13 and the main body member 12 can be held in a predetermined shape. The material B can be easily integrated.

<Usage and action>
Next, the usage method and operation of the soft composite 11 will be described.
The soft composite 11 is attached to an interior member of a vehicle using an adhesive, an adhesive tape, a fastening member, a locking structure, or the like. Examples of the vehicle interior member include an instrument panel, a console, a roof, a pillar, an armrest, a knob, a door, and a steering. The surface side of the skin layer 13 of the soft composite 11 attached to the interior member of the vehicle is exposed in the vehicle, and the soft composite 11 is part of the body such as the hand and arm of the occupant. It is pressed toward the main body member 12 from the side. At this time, the Asker F hardness of the main body member 12 of the soft composite 11 is in the range of 20-50, and the shear storage elastic modulus of the main body member 12 is in the range of 2-14 kPa in the temperature range of 0-60 ° C. Is within. The flexibility of the main body member 12 is good, and the compression repulsion force and the pressure dispersibility are exhibited in a well-balanced manner.

<Test example>
Samples 1 to 7 of gel-like urethane shown in Table 1 were produced. Table 1 shows the results of measuring Asker F hardness and shear storage modulus for each of Samples 1-7. The urethane raw materials used in Samples 1 to 7 are blended with polyether polyol as the polyol component and HDI (hexamethylene diisocyanate) adduct product of polyol as the isocyanate component. The polyol component contains a plasticizer, a catalyst, and a weather stabilizer, and the isocyanate component contains a plasticizer. The NCO / OH ratio of each sample is as shown in Table 1.

Each of the soft composites having the main body members of Samples 1 to 7 was manufactured. The skin layer of each soft composite has an outer layer (double raschel mesh) and an inner layer (urethane film).
Each of the obtained soft composites was placed on a horizontal base, and a plurality of panelists evaluated the touch when each soft composite was pressed with a hand or an arm from the skin layer side toward the body member as follows. .

“△”… A thing that is clearly hard when pressed.
In the remaining soft composites excluding the soft composites of the above evaluation results, a plurality of panelists evaluated the feeling of holding when the hand or arm was moved left and right from the pressed state as follows.

“△”: Soft and inferior in holding feeling.
“◯”: A good holding feeling is obtained.
“◎”: A better holding feeling is obtained.

  The evaluation results for each soft composite are shown in Table 1.

The soft composite using Samples 1 to 5 gave better results than the soft composite using Samples 6 and 7.

The effects exhibited by the above-described embodiment will be described below.
(1) The soft composite body 11 for a vehicle interior member includes a cross-linked gel urethane main body member 12 and a skin layer 13. The Asker F hardness of the main body member 12 is in the range of 20-50, and the shear storage modulus of the main body member 12 is in the range of 2-14 kPa in the temperature range of 0-60 ° C. According to this configuration, it is easy to obtain a good feel when pressed.

  Here, as a gel-like material other than the gel-like urethane, a styrene-based elastomer gel is known. The styrenic elastomer gel contains a styrene / butadiene / styrene copolymer, a styrene / isoprene / styrene copolymer, or a hydrogenated product thereof and a plasticizer. Such a styrenic elastomer gel does not have a crosslinked structure. On the other hand, the crosslinked gel-like urethane has a good balance between compression repulsion force and pressure-resistant dispersibility, and also has good stretchability and thermal stability. The soft composite 11 provided with the gel-like urethane main body member 12 has a good feel based on the main body member 12 and also has, for example, durability, so that it can be attached to the vehicle interior member. It is suitable for.

  (2) The Asker F hardness of the main body member 12 is in the range of 20 to 40, and the shear storage modulus of the main body member 12 is preferably in the range of 2 to 6 kPa in the above temperature range. In this case, it becomes easier to obtain a good feel when pressed.

  (3) The skin layer 13 preferably includes a fiber outer layer 13 a and an inner layer 13 b disposed between the outer layer 13 a and the main body member 12. In this case, for example, the aesthetic appearance of the soft composite 11 can be exhibited by the fiber outer layer 13a. Here, if the main body member 12 is in contact with the fiber outer layer 13a, the main body member 12 may enter between the fibers of the outer layer 13a. Thus, when the main body member 12 enters between the fibers of the outer layer 13a, for example, the thickness stability of the soft composite 11 changes, and the dimensional stability decreases. In order to increase the dimensional stability of the soft composite 11, the outer layer 13a in which the main body member 12 is difficult to enter between the fibers is selected, and therefore the degree of freedom in selecting the outer layer 13a is reduced. In this regard, since the inner layer 13b of the skin layer 13 includes the resin film layer, the contact between the main body member 12 and the fiber outer layer 13a is avoided or suppressed, so that the degree of freedom in selecting the outer layer 13a can be increased. .

  (4) When the inner layer 13b of the skin layer 13 includes a resin film layer, the resin film layer is preferably formed of a urethane film. In this case, since the flexibility of the urethane film is relatively high, the flexibility of the main body member 12 is easily felt when the skin layer 13 is pressed. Therefore, it becomes easier to obtain a good feel when pressed.

(Example of change)
The above embodiment may be modified as follows.
-Although the said skin layer 13 has the laminated structure of the outer layer 13a made from a fiber, and the inner layer 13b of the resin film layer, it can also change into the structure only of the outer layer 13a made from a fiber. The outer layer 13a may have a configuration in which a plurality of fiber layers are stacked.

-The said skin layer 13 can also be comprised by synthetic leather, for example.
In the above embodiment, the inner layer 13b is composed only of a resin film layer, but the inner layer 13b is composed of a resin film layer and a layer other than this resin film layer (for example, an adhesive layer or a foamed resin layer). Also good. In addition, layers other than the resin film layer can be provided at at least one of a position between the outer layer 13 a and the resin film layer and a position between the resin film layer and the main body member 12.

  -Inner layer 13b (resin film layer) may be formed in a bag shape, and body member 12 (gel urethane) may be enclosed in the bag. The bag-shaped resin film layer can be formed by heat-welding or bonding the resin film so as to form a bag. In an example of the method of enclosing the main body member 12 in the bag-shaped resin film layer, first, an opening for injecting a urethane raw material into the bag-shaped resin film layer is formed. Next, after injecting the urethane raw material from the opening, the opening is sealed, and the urethane raw material is reacted under a predetermined condition to generate gel urethane (main body member 12). Next, the soft composite 11 can be obtained by providing the outer layer 13a on the inner layer 13b. In addition, after joining the outer layer 13a to the bag-shaped inner layer 13b in advance, the urethane raw material may be injected into the bag-shaped inner layer 13b. Moreover, you may seal an opening part, after producing | generating the main body member 12 (gel-like urethane). Alternatively, after separately generating the main body member 12 (gel urethane), the main body member 12 may be enclosed in a bag-like resin film layer. Thus, when the inner layer 13b (resin film layer) is formed in a bag shape, since the whole main body member 12 is covered with the inner layer 13b, the main body member 12 can be protected suitably.

-Inner layer 13b (resin film layer) can also be formed using the apply | coating method (for example, spray application etc.) which apply | coats a resin material to outer layer 13a.
-Although the soft composite 11 of the said embodiment is equipped with the base material B, this base material B can also be abbreviate | omitted. The soft composite 11 from which the base material B is omitted can be attached to the interior member of the vehicle using, for example, an adhesive, a double-sided tape, stitching, or the like.

  In the embodiment, the main body member 12 is molded by injecting a urethane raw material into the skin layer 13, but the main body member 12 may be molded separately from the skin layer 13. The main body member 12 can be integrated with the skin layer 13 by, for example, an adhesive or self-adhesion of the main body member 12.

  -The main body member 12 of the said embodiment can also be formed by dividing | segmenting and forming the several layer after dividing | segmenting into several layers. However, it is preferable that the main body member 12 has a single-layer structure as in the above-described embodiment from the viewpoint that the soft composite 11 can be easily manufactured.

The technical idea that can be grasped from the embodiment and the modified examples will be described below.
(A) The resin film layer constituting the inner layer is a soft composite formed in a bag shape covering the entire body member.

  (B) A method for producing the soft composite, the step of forming a shape in which the surface side of the skin layer swells using a mold for heating press, and the urethane raw material is injected into the back side of the skin layer The manufacturing method of a soft composite provided with the process to make and the reaction process with which the said urethane raw material is made to react.

  (C) In the manufacturing method described in (b) above, in the step of preparing a jig molded with the hot press mold and injecting the urethane raw material, the skin layer is placed on the jig. A method for producing a soft composite, wherein the urethane raw material is injected into the back side of the skin layer in a state.

  DESCRIPTION OF SYMBOLS 11 ... Soft composite, 12 ... Main body member, 13 ... Skin layer, 13a ... Outer layer, 13b ... Inner layer.

Claims (4)

A soft composite for a vehicle interior member attached to an interior member of a vehicle,
A cross-linked gel urethane main body member, and a skin layer,
The Asker F hardness of the main body member is in the range of 20-50,
The soft composite, wherein the main body member has a shear storage modulus of 2 to 14 kPa in a temperature range of 0 to 60 ° C. The Asker F hardness of the body member is in the range of 20-40,
The soft composite according to claim 1, wherein the shear storage elastic modulus of the main body member is within a range of 2 to 6 kPa in the temperature range.   3. The soft composite according to claim 1, wherein the skin layer includes a fiber outer layer and an inner layer disposed between the outer layer and the main body member, and the inner layer includes a resin film layer. body.   The soft composite according to claim 3, wherein the resin film layer is formed of a urethane film.