JP2582745B2 - Polypropylene foam and interior materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polypropylene foam used, for example, as an interior material of an automobile.

[0002]

2. Description of the Related Art Heretofore, as this kind of interior material, a polystyrene foam or a flexible polyurethane foam impregnated with diisocyanate has been used (Japanese Patent Publication No. Sho.
No. 3-7577).

[0003]

However, the above-mentioned polystyrene foam and diisocyanate-impregnated flexible polyurethane foam sheet have poor rigidity, and therefore, a reinforcing material such as a glass mat must be laminated, and therefore, the manufacturing process is inevitable. It becomes complicated and heavy. Also, polyurethane foam is not thermoplastic and therefore difficult to reuse.

[0004]

Means for Solving the Problems The present invention, as a means for solving the above-mentioned conventional problems, does not inhibit thermoplasticity.
Provided is an automotive interior material comprising a foam of polypropylene mixed with a polypropylene and / or acrylonitrile-butadiene-styrene resin which has been crosslinked to a certain degree, a foam sheet of the polypropylene, and a skin material laminated on the surface of the foam sheet. Is what you do.

[0005]

[Action] To the extent that polypropylene does not hinder thermoplasticity
Crosslinked polypropylene and / or acrylonitrile - butadiene - when mixing styrene resin (ABS resin), improves the stiffness of the polypropylene matrix, also during the foaming or frothing Since melt viscosity increases polypropylene, bubbles finely and uniformly dispersed also easily bubbles is maintained, the foam having a uniform and fine bubble structure. Such a melt viscosity is the value of
Control the density and amount added and / or the amount of ABS resin added.
It can be easily controlled by trawling .
Therefore, when used as an interior material for automobiles, no reinforcing material is required. Further, since the above-mentioned polypropylene foam is thermoplastic, it can be remelted to form pellets or films for molding, and can be reused.

[0006] and the call Hashipo Ripuropi <br/> Ren used in the present invention, a carboxyl group-containing polypropylene obtained by crosslinking by the polyvalent metal, a polypropylene having a functional group having active hydrogen by polyvalent isocyanate Cross-linked, epoxy-containing polypropylene cross-linked with amine, hydroxyl- or carboxyl-containing polypropylene cross-linked with amino resin such as melamine resin, urea resin, benzoguanamine resin, etc. The density is such that the thermoplasticity of the crosslinked polypropylene is not impaired. In the case of metal crosslinking, the crosslinking is reversibly dissociated by heat, so that the thermoplasticity is maintained even if the crosslinking density is high.

[0007] The rack Hashipo polypropylene and / or ABS resin are mixed usually about 10 to 70 wt% of polypropylene, the mixture melt is foamed by chemical foaming by mechanical foaming or chemical blowing agents by mechanical agitation . Usually, a chemical foaming agent is added to the mixed melt to form a sheet-like foam by high-pressure extrusion. In this method, the expansion ratio is usually about 3 to 7 times.

The above-mentioned mixed melt may be mixed with an inorganic or organic reinforcing fiber such as glass fiber, carbon fiber, metal fiber, aramid fiber and polyamide fiber.

[0009]

EXAMPLES polypropylene containing 30 wt% of the thermoplastic polypropylene that have been <br/> metal bridge so as not to inhibit the heated and melted to 180 ° C., further mixing 40% by weight of glass fibers. 5 wt% of azodicarbonamide was added as a chemical foaming agent to the mixed melt, and a high pressure extrusion was performed to obtain a polypropylene foam sheet having a foaming ratio of 5 times and a thickness of 3 mm.

As shown in FIG. 1, a polyester needle punched non-woven fabric (2) is adhered to the surface of the polypropylene foam sheet (1) as a skin material with an acrylic adhesive,
Next, the polypropylene foam sheet (1) and the nonwoven fabric (2)
The laminated sheet was heat-softened to 170 ° C. and formed by vacuum forming to produce an automobile ceiling material (3) as shown in FIG.

[0011]

Accordingly, in the present invention, a highly rigid and uniform fine cell structure is provided without using a reinforcing material.
Lupo polypropylene foam is obtained, the use of polypropylene foam of the present invention, lightweight automotive interior material is manufactured in a simple process. Further, since the polypropylene foam is thermoplastic, it can be easily reused.

[Brief description of the drawings]

 1 and 2 show an embodiment of the present invention.

FIG. 1 is a cross-sectional view of a laminated sheet

FIG. 2 is a perspective view of an automobile ceiling material.

[Explanation of symbols]

 1 Polypropylene foam 2 Non-woven fabric 3 Automotive ceiling material

Claims (2)

(57) [Claims] 1. A crosslinked poly which does not impair thermoplasticity.
Polypropylene foam mixed with propylene and / or acrylonitrile-butadiene-styrene resin 2. An interior material for automobiles comprising the foamed sheet of polypropylene according to claim 1 and a skin material laminated on the surface of the foamed sheet.