JP2933966B2 - Skin material for foam products - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a skin material of a foamed product such as an instrument panel, a console box, and a pillar garnish for an automobile.

(Prior Art) As shown in the partial sectional view of FIG. 4, the foamed product includes a foam 10 made of polyurethane foam or the like, a skin material 12 covering the surface thereof, And a base material (not shown) provided on the bottom surface of the body 10.

By the way, the skin material 12 includes a material made of fabric, a material made of vinyl chloride resin, and the like. Among them, the skin material made of vinyl chloride resin is easy to be formed into a predetermined shape, and furthermore, the skin material is used. It has been used particularly frequently since it has an advantage that a foam can be molded integrally with the skin material by injecting a liquid foaming material into the inner surface of the material (skin integral molding).

Further, the skin material made of the vinyl chloride resin includes a one-layer structure having a non-foamed layer and a two-layer structure in which a foamed layer is laminated on the inner side of the non-foamed layer in order to further enhance the soft feeling. .

However, the skin material made of the vinyl chloride resin has a large amount of a plasticizer mixed with the vinyl chloride resin in order to enhance the flexibility of the skin material, regardless of whether the skin material has one layer or two layers. As a result, the plasticizer migrated to the foam 12 in contact with the inner surface of the skin material over time, and the migration of the plasticizer caused the vinyl chloride resin skin material to harden (loss of flexibility).

In addition, a foam 12 to which a skin material made of vinyl chloride resin is adhered.
Is made of a polyurethane foam, the amine catalyst added to the polyurethane foam raw material migrates to the vinyl chloride resin skin material, whereby the plasticizer in the skin material migrates to the foam 12. As a result, the heat resistance of the vinyl chloride resin skin material is reduced (the heat deterioration of the vinyl chloride resin is promoted).

Furthermore, since the adhesiveness between the vinyl chloride resin and the polyurethane foam is not good, in a foam product obtained by integral molding of the skin, the skin material is peeled off from the foam at the time of compression, etc. There is also a problem that wrinkles easily occur in the material.

In the case of a two-layer vinyl chloride resin skin material having a non-foamed layer as the outer layer and a foamed layer as the inner layer, the surface of the foamed layer (the inner surface of the skin material) becomes uneven due to foaming. Depending on the case, the appearance of the skin material and the foam body seems to be good, but since it is not truly adhered,
The skin material was still easy to peel off from the foam.

(Problems to be Solved by the Invention) Accordingly, in view of the above points, the present invention suppresses the migration of a plasticizer in a vinyl chloride resin skin material, makes it difficult for physical properties of the skin material to deteriorate, and reduces The object is to enhance the adhesion between the foam to be adhered and the skin material.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a two-layer structure in which an inner layer made of a thermoplastic polyurethane and a vinyl chloride copolymer is integrally laminated with an outer layer made of a vinyl chloride resin. The slash molded product constituted the skin material of the foamed product.

(Function) Since the outer layer is made of a vinyl chloride resin and the inner layer is made of a copolymer of polyurethane and vinyl chloride, the outer layer made of the vinyl chloride resin and the skin material are adhered to the foam when they are applied to the foam surface. An inner layer made of a thermoplastic polyurethane / vinyl chloride copolymer is interposed between the inner foam. Therefore, the plasticizer compounded in the vinyl chloride resin of the outer layer of the skin material is blocked by the inner layer of the skin material made of a copolymer of the thermoplastic polyurethane and the vinyl chloride resin, and is less likely to migrate to the foam inside the skin material. . On the other hand, the amine catalyst of the polyurethane foam is also blocked by the inner layer of the skin material and hardly migrates to the outer layer of the skin material, and the migration of the plasticizer from the outer layer of the skin material to the foam caused by the migration of the amine catalyst is suppressed. Become.

As a result, the transfer of the plasticizer from the outer layer of the skin material made of the vinyl chloride resin to the foam inside the skin material is efficiently suppressed, and the physical properties of the skin material are less likely to be reduced.

Further, since the inner layer of the skin material is made of a copolymer of polyurethane and vinyl chloride, it has both properties of polyurethane and vinyl chloride, and exhibits good adhesiveness to both vinyl chloride resin and polyurethane foam. Therefore, the skin material has a strong bond between the outer layer and the inner layer, and also has a high adhesiveness between the polyurethane foam formed integrally with the skin inside the skin material and the skin material inner layer.

As a result, the skin material is firmly adhered to the surface of the polyurethane foam formed integrally with the skin, and the skin material does not rise from the foam to cause wrinkles.

(Example) An example of the present invention will be described below.

FIG. 1 is a sectional view of a skin material of a foamed product according to one embodiment of the present invention.

The skin material 20 has a two-layer structure in which an outer layer 22 and an inner layer 24 are laminated and integrated.

The outer layer 22 is made of a soft vinyl chloride resin in which a plasticizer, a stabilizer, a pigment, and the like are blended with the vinyl chloride resin, and has a normal thickness.
It consists of about 0.5-2.0mm.

On the other hand, the inner layer 24 is made of a copolymer of polyurethane and a vinyl chloride resin, and has a thickness of usually about 0.1 to 0.5 mm. Various copolymers of the polyurethane and the vinyl chloride resin can be used.
-Hexamethylene diisocyanate 35 g (NCO / OH = 1.6
7) NIPPOLL, a polyester polyol with an average molecular weight of 2000
A copolymer formed from 250 g of AN 4010 (manufactured by Nippon Polyurethane Industry Co., Ltd.), 500 g of vinyl chloride fat powder having an average degree of polymerization of 1300, 5 g of calcium stearate, and 5 g of zinc stearate can be mentioned.

The outer layer 22 and the inner layer 24 of the skin material 20 are integrally formed by slash molding as follows.

First, a vinyl chloride resin powder or a sol is put into a slush molding die, and an outer layer made of a vinyl chloride resin is formed on the die surface by ordinary slush molding. Then
A powder having a particle size of 0.12 to 0.18 μm obtained by adding a stabilizer to the copolymer of the polyurethane and the vinyl chloride resin is poured into the inner surface of the outer layer made of the vinyl chloride resin, and the inner layer is slashed integrally with the outer layer. Molding. Thereafter, if the molded product is taken out of the slush molding die, the skin material 20 is obtained.

As shown in FIG. 2, the skin material 20 thus formed is placed in a cavity of a mold 26 with the skin material inner layer 24 inside, and a polyurethane foam material is placed on the skin material inner layer 24.
28 is injected and foam-molded integrally with the skin material 20, thereby being adhered to the foam surface.

FIG. 3 is a cross-sectional view of a foamed product 32 in which the skin material 20 is adhered to the surface of the foam 30 by integral molding of the skin.
In the foamed product 32, the skin material 20 and the foam 30 are firmly bonded by the self-adhesive force of the polyurethane foam raw material 28.

(Effect) The skin material of the foamed product according to the present invention has a two-layer structure in which an inner layer made of a copolymer of a thermoplastic polyurethane and a vinyl chloride resin and an outer layer made of a vinyl chloride resin are integrally formed by slash molding. Become. Therefore, when the skin material is adhered to the foam, the plasticizer contained in the vinyl chloride resin constituting the outer layer can be prevented from migrating to the foam inside the skin material by the skin material inner layer. It was. Further, when the foam to be covered with the skin material is a polyurethane foam, the amine catalyst contained in the polyurethane foam can be suppressed by the skin material inner layer from migrating to the skin material outer layer, The migration of the plasticizer from the skin material caused by the migration of the amine catalyst was also prevented. As a result, it was possible to favorably prevent a decrease in the physical properties of the skin material caused by the migration of the plasticizer.

Further, the skin material of the present invention has good adhesion between the inner layer and the outer layer made of vinyl chloride resin and good adhesion between the polyurethane foam to which the skin material is applied and the skin material inner layer since the inner layer has the above-described structure. Thus, peeling of the inner layer and the outer layer, and the skin material and the foam can be prevented, and wrinkles due to the lifting of the skin material were less likely to occur.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a skin material of a foamed product according to one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a case where a skin is integrally formed using the skin material, and FIG. FIG. 4 is a partial cross-sectional view of a foamed product on which a conventional skin material is adhered. 20: foam material skin material, 22: outer layer, 24: inner layer

Claims (1)

(57) [Claims] 1. A skin material of a foamed product comprising a two-layer slush molded product in which an inner layer made of a copolymer of thermoplastic polyurethane and vinyl chloride is integrally laminated with an outer layer made of a vinyl chloride resin.